/* 君伴辅导 - 样式文件 */
/* Design System: 深海蓝+奶油白+橙红 (60-30-10法则) */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* ======================================
       60-30-10 色彩系统 (HSL格式)
       ====================================== */

    /* === 60% 主导色 - 深海蓝 === */
    --color-dominant: hsl(220, 90%, 10%);
    --color-dominant-light: hsl(220, 80%, 15%);
    --color-dominant-lighter: hsl(220, 70%, 20%);

    /* === 30% 支撑色 - 奶油白 === */
    --color-support: hsl(40, 100%, 97%);
    --color-support-dark: hsl(40, 50%, 90%);
    --color-support-darker: hsl(40, 30%, 80%);

    /* === 10% 强调色 - 活力橙红 === */
    --color-accent: hsl(15, 100%, 55%);
    --color-accent-light: hsl(15, 100%, 65%);
    --color-accent-dark: hsl(15, 100%, 45%);

    /* === 辅助状态色 === */
    --success: hsl(150, 80%, 45%);
    --success-light: hsl(150, 80%, 55%);
    --warning: hsl(45, 100%, 55%);
    --warning-light: hsl(45, 100%, 65%);
    --danger: hsl(0, 80%, 55%);
    --danger-light: hsl(0, 80%, 65%);
    --info: hsl(200, 80%, 55%);
    --info-light: hsl(200, 80%, 65%);

    /* === 渐变定义 === */
    --gradient-main: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-dark) 100%);
    --gradient-card: linear-gradient(135deg, hsla(40, 100%, 97%, 0.05) 0%, hsla(40, 100%, 97%, 0.02) 100%);
    --gradient-accent: linear-gradient(135deg, hsl(15, 100%, 60%) 0%, hsl(350, 80%, 55%) 100%);
    --gradient-success: linear-gradient(135deg, var(--success) 0%, hsl(180, 70%, 50%) 100%);

    /* === 语义化背景色 === */
    --bg-color: var(--color-dominant);
    --bg-card: hsla(40, 100%, 97%, 0.06);
    --bg-card-hover: hsla(40, 100%, 97%, 0.1);
    --sidebar-bg: var(--color-dominant-light);
    --sidebar-text: var(--color-support);

    /* === 文字颜色 === */
    --text-primary: var(--color-support);
    --text-secondary: hsl(40, 50%, 75%);
    --text-muted: hsl(40, 30%, 60%);

    /* === 边框和阴影 === */
    --border-color: hsla(40, 100%, 97%, 0.1);
    --border-light: hsla(40, 100%, 97%, 0.15);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.4);
    --shadow-accent: 0 8px 24px hsla(15, 100%, 55%, 0.3);

    /* === 字体系统 === */
    --font-heading: 'Space Grotesk', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    --font-code: 'JetBrains Mono', 'SF Mono', 'Fira Code', Monaco, monospace;

    /* === 统一过渡和圆角 === */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-bounce: all 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
    --theme-transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;

    /* === 圆角 === */
    --border-radius: 20px;
    --border-radius-sm: 12px;
    --border-radius-xs: 8px;

    /* === 兼容性别名（保持向后兼容）=== */
    --primary-color: var(--color-accent);
    --primary-hover: var(--color-accent-dark);
    --primary-light: var(--color-accent-light);
    --secondary-color: var(--success);
    --warning-color: var(--warning);
    --danger-color: var(--danger);
    --accent-color: var(--info);
    --card-bg: var(--bg-card);
    --card-bg-hover: var(--bg-card-hover);
    --shadow-primary: var(--shadow-accent);
}

/* 深色模式（现在是默认模式，变量已在 :root 中定义）*/
[data-theme="dark"] {
    /* 深色模式保持默认值，无需覆盖 */
}

/* 浅色模式 */
[data-theme="light"] {
    /* 60% 主导色 - 浅色背景 */
    --bg-color: hsl(40, 50%, 96%);
    --sidebar-bg: hsl(220, 50%, 25%);

    /* 30% 支撑色 */
    --bg-card: hsla(220, 50%, 20%, 0.05);
    --bg-card-hover: hsla(220, 50%, 20%, 0.08);
    --card-bg: hsla(220, 50%, 20%, 0.05);
    --card-bg-hover: hsla(220, 50%, 20%, 0.08);

    /* 文字颜色 */
    --text-primary: hsl(220, 50%, 15%);
    --text-secondary: hsl(220, 30%, 40%);
    --text-muted: hsl(220, 20%, 55%);

    /* 边框和阴影 */
    --border-color: hsla(220, 50%, 20%, 0.1);
    --border-light: hsla(220, 50%, 20%, 0.15);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.15);
}

/* 跟随系统主题 - 浅色 */
@media (prefers-color-scheme: light) {
    :root:not([data-theme="dark"]) {
        --bg-color: hsl(40, 50%, 96%);
        --sidebar-bg: hsl(220, 50%, 25%);
        --bg-card: hsla(220, 50%, 20%, 0.05);
        --bg-card-hover: hsla(220, 50%, 20%, 0.08);
        --card-bg: hsla(220, 50%, 20%, 0.05);
        --card-bg-hover: hsla(220, 50%, 20%, 0.08);
        --text-primary: hsl(220, 50%, 15%);
        --text-secondary: hsl(220, 30%, 40%);
        --text-muted: hsl(220, 20%, 55%);
        --border-color: hsla(220, 50%, 20%, 0.1);
        --border-light: hsla(220, 50%, 20%, 0.15);
        --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
        --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.15);
    }
}

body {
    font-family: var(--font-body);
    font-size: 13px;
    font-weight: 400;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.5;
    letter-spacing: -0.01em;
    transition: var(--theme-transition);
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* === 三层背景光晕效果 === */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image:
        /* 第1层：左下角橙红光晕 */
        radial-gradient(circle at 20% 80%, hsla(15, 100%, 55%, 0.12) 0%, transparent 50%),
        /* 第2层：右上角蓝色光晕 */
        radial-gradient(circle at 80% 20%, hsla(200, 80%, 60%, 0.08) 0%, transparent 50%),
        /* 第3层：中心淡蓝光晕 */
        radial-gradient(circle at 50% 50%, hsla(220, 80%, 50%, 0.05) 0%, transparent 50%);
    pointer-events: none;
    z-index: -1;
}

/* 浅色模式光晕 - 降低强度 */
[data-theme="light"] body::before {
    background-image:
        radial-gradient(circle at 20% 80%, hsla(15, 100%, 55%, 0.06) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, hsla(200, 80%, 60%, 0.04) 0%, transparent 50%),
        radial-gradient(circle at 50% 50%, hsla(220, 80%, 50%, 0.03) 0%, transparent 50%);
}

@media (prefers-color-scheme: light) {
    :root:not([data-theme="dark"]) body::before {
        background-image:
            radial-gradient(circle at 20% 80%, hsla(15, 100%, 55%, 0.06) 0%, transparent 50%),
            radial-gradient(circle at 80% 20%, hsla(200, 80%, 60%, 0.04) 0%, transparent 50%),
            radial-gradient(circle at 50% 50%, hsla(220, 80%, 50%, 0.03) 0%, transparent 50%);
    }
}

/* 标题使用 Space Grotesk 字体 */
h1, h2, h3, h4, h5, h6,
.sidebar-header h1,
.welcome-content h2,
.stats-header h2,
.wrong-book-header h2,
.weekly-plan-header h2,
.profile-header h2,
.all-history-header h2 {
    font-family: var(--font-heading);
    font-weight: 600;
    letter-spacing: -0.02em;
}

/* 代码使用 JetBrains Mono 字体 */
code, pre, .code-block,
.message-content code,
.message-content pre {
    font-family: var(--font-code);
}

.app-container {
    display: flex;
    height: 100vh;
    overflow: hidden;
}

/* 侧边栏 */
.sidebar {
    width: 220px;
    background: var(--sidebar-bg);
    color: var(--sidebar-text);
    display: flex;
    flex-direction: column;
    overflow-y: auto;
}

.sidebar-header {
    padding: 16px 14px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    position: relative;
}

.sidebar-header h1 {
    font-size: 0.9375rem;
    margin-bottom: 2px;
    font-weight: 600;
    letter-spacing: -0.02em;
}

.brand-title {
    display: flex;
    align-items: center;
    gap: 8px;
}

.brand-logo {
    width: 26px;
    height: 26px;
    display: inline-block;
    vertical-align: middle;
}

.sidebar-header .subtitle {
    font-size: 0.6875rem;
    opacity: 0.7;
    font-weight: 400;
}

/* 侧边栏头部操作按钮组 */
.sidebar-header-actions {
    position: absolute;
    top: 12px;
    right: 12px;
    display: flex;
    gap: 6px;
}

.theme-toggle-btn,
.settings-btn {
    width: 28px;
    height: 28px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    background: rgba(255, 255, 255, 0.05);
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.875rem;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
}

.theme-toggle-btn:hover,
.settings-btn:hover {
    background: rgba(255, 255, 255, 0.15);
    border-color: rgba(255, 255, 255, 0.3);
}

/* 学生信息 */
.student-info {
    display: flex;
    align-items: center;
    padding: 12px 14px;
    background: rgba(255, 255, 255, 0.05);
    margin: 12px;
    border-radius: 10px;
}

.student-info .avatar {
    font-size: 1.5rem;
    margin-right: 10px;
}

.student-info .info {
    display: flex;
    flex-direction: column;
}

.student-info .name {
    font-weight: 600;
    font-size: 0.8125rem;
    letter-spacing: -0.01em;
}

.student-info .points {
    font-size: 0.6875rem;
    color: var(--secondary-color);
    font-weight: 500;
}

.student-info .class-name {
    font-size: 0.625rem;
    opacity: 0.7;
}

.student-info {
    flex-wrap: wrap;
}

.student-stats {
    width: 100%;
    display: flex;
    gap: 12px;
    margin-top: 6px;
    padding-top: 6px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.student-stats .stat {
    font-size: 0.625rem;
    opacity: 0.8;
}

/* 功能菜单 */
.function-menu {
    padding: 12px;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.menu-btn {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 12px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    color: var(--sidebar-text);
    font-size: 0.75rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
}

.menu-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.2);
}

.menu-btn.active {
    background: var(--primary-color);
    border-color: var(--primary-color);
}

.menu-btn .icon {
    font-size: 1rem;
}

/* 科目导航 */
.subjects-nav {
    padding: 12px;
    flex: 1;
}

.subjects-nav h3,
.chapters-panel h3 {
    font-size: 0.625rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    opacity: 0.6;
    margin-bottom: 10px;
    padding: 0 6px;
    font-weight: 600;
}

.subjects-nav ul,
.chapters-panel ul {
    list-style: none;
}

.subject-item,
.chapter-item {
    display: flex;
    align-items: center;
    padding: 9px 12px;
    border-radius: 7px;
    cursor: pointer;
    transition: all 0.2s;
    margin-bottom: 3px;
}

.subject-item:hover,
.chapter-item:hover {
    background: rgba(255, 255, 255, 0.1);
}

.subject-item.active,
.chapter-item.active {
    background: var(--primary-color);
}

.subject-item .icon {
    font-size: 1rem;
    margin-right: 10px;
}

.subject-item .name {
    font-size: 0.75rem;
    font-weight: 500;
}

/* 章节面板 */
.chapters-panel {
    padding: 12px;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.chapter-item {
    flex-direction: column;
    align-items: flex-start;
}

.chapter-item .chapter-name {
    font-weight: 500;
    margin-bottom: 3px;
    font-size: 0.75rem;
}

.chapter-item .chapter-desc {
    font-size: 0.625rem;
    opacity: 0.6;
}

/* 学期分组头部 */
.semester-header {
    padding: 10px 16px 6px;
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--primary-color);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-top: 8px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    list-style: none;
}

.semester-header:first-child {
    margin-top: 0;
}

.btn-back {
    margin-top: auto;
    padding: 9px;
    background: transparent;
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: var(--sidebar-text);
    border-radius: 7px;
    cursor: pointer;
    transition: all 0.2s;
    font-size: 0.75rem;
    font-weight: 500;
}

.btn-back:hover {
    background: rgba(255, 255, 255, 0.1);
}

/* 主内容区 */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

/* 欢迎页面 */
.welcome-page,
.select-prompt {
    flex: 1;
    display: flex;
    align-items: flex-start;
    justify-content: center;
    padding: 20px;
    overflow-y: auto;
    overflow-x: hidden;
}

.welcome-content,
.prompt-content {
    text-align: center;
    max-width: 640px;
    width: 100%;
    margin: auto 0;
}

/* 欢迎页面标题渐变升级 */
.welcome-content h2,
.prompt-content h2 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 10px;
    background: var(--gradient-main);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.02em;
}

.welcome-content p,
.prompt-content p {
    color: var(--text-secondary);
    margin-bottom: 20px;
    font-size: 0.8125rem;
    font-weight: 400;
}

.login-form {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 20px;
}

.login-form .form-row {
    display: flex;
    gap: 8px;
}

.login-form input {
    flex: 1;
    padding: 10px 14px;
    border: 1px solid var(--border-color);
    border-radius: 20px;
    font-size: 0.8125rem;
    font-weight: 400;
    outline: none;
    transition: border-color 0.2s;
}

.login-form input:focus {
    border-color: var(--primary-color);
}

/* 积分规则 */
.points-rules {
    margin-top: 16px;
    padding: 12px 16px;
    background: hsla(15, 100%, 55%, 0.05);
    border-radius: 12px;
    border: 1px solid hsla(15, 100%, 55%, 0.1);
}

.points-rules h4 {
    font-size: 0.6875rem;
    margin-bottom: 8px;
    color: var(--primary-color);
    font-weight: 600;
}

.rules-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 6px;
    font-size: 0.6875rem;
    color: var(--text-secondary);
    font-weight: 400;
}

/* 模式选择卡片 - Glassmorphism升级 */
.mode-cards {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
    margin-top: 16px;
}

.mode-card {
    padding: 14px 12px;
    background: var(--card-bg);
    -webkit-backdrop-filter: blur(20px);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-light);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
    position: relative;
    overflow: hidden;
}

/* 顶部渐变装饰线 */
.mode-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--gradient-main);
    opacity: 0;
    transition: var(--transition);
}

.mode-card:hover::before {
    opacity: 1;
}

.mode-card:hover {
    transform: translateY(-4px) scale(1.02);
    border-color: hsla(15, 100%, 55%, 0.3);
    box-shadow: var(--shadow-lg);
}

.mode-card .icon {
    font-size: 1.5rem;
    display: block;
    margin-bottom: 6px;
    filter: drop-shadow(0 4px 8px hsla(15, 100%, 55%, 0.3));
}

.mode-card h4 {
    font-size: 0.8125rem;
    margin-bottom: 4px;
    background: var(--gradient-main);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 600;
}

.mode-card p {
    font-size: 0.625rem;
    color: var(--text-secondary);
    margin: 0;
    font-weight: 400;
}

.btn-primary {
    padding: 10px 24px;
    background: var(--gradient-main);
    color: white;
    border: none;
    border-radius: 24px;
    font-size: 0.8125rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow-primary);
    position: relative;
    overflow: hidden;
    letter-spacing: -0.01em;
}

/* 按钮光效动画 */
.btn-primary::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(255, 255, 255, 0.2),
        transparent
    );
    transition: left 0.5s;
}

.btn-primary:hover::before {
    left: 100%;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 32px hsla(15, 100%, 55%, 0.4);
}

.btn-primary:active {
    transform: translateY(0);
}

.features {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
}

.feature {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    padding: 10px 14px;
    background: var(--card-bg);
    -webkit-backdrop-filter: blur(16px);
    backdrop-filter: blur(16px);
    border: 1px solid var(--border-light);
    border-radius: var(--border-radius-sm);
    transition: var(--transition);
}

.feature:hover {
    transform: translateY(-2px) scale(1.02);
    border-color: hsla(15, 100%, 55%, 0.3);
    box-shadow: 0 8px 32px hsla(15, 100%, 55%, 0.2);
}

.feature .icon {
    font-size: 1.25rem;
    filter: drop-shadow(0 4px 8px hsla(15, 100%, 55%, 0.3));
}

.feature span:last-child {
    font-size: 0.6875rem;
    color: var(--text-secondary);
    font-weight: 500;
}

/* 聊天界面 */
.chat-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.chat-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 6px 12px;
    background: var(--card-bg);
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow);
    gap: 8px;
    flex-wrap: wrap;
    min-height: 36px;
}

.chat-nav {
    display: flex;
    gap: 4px;
}

.nav-btn {
    display: flex;
    align-items: center;
    gap: 2px;
    padding: 4px 8px;
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 0.6875rem;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s;
}

.nav-btn:hover {
    background: var(--border-color);
    color: var(--text-primary);
}

.nav-btn.new-chat {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: white;
}

.nav-btn.new-chat:hover {
    background: var(--primary-hover);
}

.current-topic {
    display: flex;
    align-items: center;
    gap: 6px;
}

.subject-icon {
    font-size: 0.875rem;
}

.topic-text {
    font-weight: 600;
    font-size: 0.75rem;
    letter-spacing: -0.01em;
}

.session-points {
    color: var(--secondary-color);
    font-weight: 600;
    font-size: 0.6875rem;
}

.session-info {
    display: flex;
    align-items: center;
    gap: 8px;
}

.chapter-stars {
    color: var(--warning-color);
    font-size: 0.6875rem;
}

.session-type-badge {
    padding: 2px 6px;
    background: var(--warning-color);
    color: white;
    border-radius: 8px;
    font-size: 0.5625rem;
    font-weight: 600;
}

.session-type-badge.diagnosis {
    background: #8b5cf6;
}

.session-type-badge.exam {
    background: #ec4899;
}

/* 错题本面板 */
.wrong-book-panel {
    padding: 16px;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.wrong-book-panel h3 {
    font-size: 0.875rem;
    margin-bottom: 12px;
}

.wrong-filter {
    margin-bottom: 12px;
}

.wrong-filter select {
    width: 100%;
    padding: 10px 12px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 8px;
    color: var(--sidebar-text);
    font-size: 0.875rem;
}

.wrong-filter select option {
    background: var(--sidebar-bg);
}

#wrongList {
    list-style: none;
    flex: 1;
    overflow-y: auto;
}

#wrongList li {
    padding: 12px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 8px;
    margin-bottom: 8px;
    cursor: pointer;
    transition: all 0.2s;
}

#wrongList li:hover {
    background: rgba(255, 255, 255, 0.1);
}

#wrongList .wrong-subject {
    font-size: 0.75rem;
    opacity: 0.7;
}

#wrongList .wrong-preview {
    font-size: 0.8125rem;
    margin-top: 4px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* 错题详情页面 */
.wrong-detail {
    flex: 1;
    display: flex;
    align-items: flex-start;
    justify-content: center;
    padding: 20px;
    overflow-y: auto;
}

.wrong-detail-content {
    max-width: 600px;
    width: 100%;
    background: var(--card-bg);
    padding: 24px;
    border-radius: 16px;
    box-shadow: var(--shadow);
    margin: auto;
}

.wrong-detail-content h3 {
    font-size: 1.25rem;
    margin-bottom: 24px;
}

.wrong-question {
    padding: 20px;
    background: var(--bg-color);
    border-radius: 12px;
    margin-bottom: 20px;
    line-height: 1.8;
}

.wrong-info {
    margin-bottom: 20px;
}

.wrong-info-item {
    display: flex;
    padding: 12px 16px;
    background: var(--bg-color);
    border-radius: 8px;
    margin-bottom: 8px;
}

.wrong-info-item .label {
    min-width: 100px;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.wrong-info-item .value {
    flex: 1;
    font-weight: 500;
}

.wrong-info-item .value.wrong {
    color: var(--danger-color);
}

.wrong-info-item .value.correct {
    color: var(--success-color);
}

/* 错题解答区域 */
.wrong-explanation {
    background: var(--bg-color);
    border-radius: 12px;
    padding: 16px;
    margin-bottom: 20px;
}

.explanation-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}

.explanation-header .label {
    font-weight: 600;
    color: var(--text-primary);
}

.btn-generate-explanation {
    padding: 6px 12px;
    font-size: 0.75rem;
    background: var(--primary-gradient, var(--primary-color));
    background-color: var(--primary-color);
    color: #fff;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    transition: var(--transition);
}

.btn-generate-explanation:hover {
    transform: scale(1.02);
    box-shadow: var(--shadow-primary);
}

.btn-generate-explanation:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.explanation-content {
    line-height: 1.8;
    color: var(--text-primary);
    max-height: 300px;
    overflow-y: auto;
    padding-right: 8px;
}

/* 解答区域滚动条 */
.explanation-content::-webkit-scrollbar {
    width: 4px;
}

.explanation-content::-webkit-scrollbar-track {
    background: transparent;
}

.explanation-content::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 2px;
}

.explanation-content::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

.explanation-content .empty-hint,
.explanation-content .loading-hint,
.explanation-content .error-hint {
    color: var(--text-muted);
    font-size: 0.875rem;
    text-align: center;
    padding: 20px;
}

.explanation-content .loading-hint {
    color: var(--primary-color);
}

.explanation-content .error-hint {
    color: var(--danger-color);
}

.wrong-actions {
    display: flex;
    gap: 12px;
}

.btn-secondary {
    flex: 1;
    padding: 14px;
    background: transparent;
    border: 2px solid var(--border-color);
    border-radius: 12px;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-secondary:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.wrong-actions .btn-primary {
    flex: 1;
}

/* 聊天消息区 */
.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 10px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.message {
    display: flex;
    gap: 8px;
    max-width: 85%;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.message.user {
    align-self: flex-end;
    flex-direction: row-reverse;
}

.message-avatar {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.875rem;
    flex-shrink: 0;
}
.message-avatar .avatar-logo {
    width: 20px;
    height: 20px;
    display: block;
}


.message.assistant .message-avatar {
    background: var(--gradient-main);
    box-shadow: 0 4px 16px hsla(15, 100%, 55%, 0.4);
}

.message.user .message-avatar {
    background: linear-gradient(135deg, hsl(200, 80%, 55%) 0%, hsl(220, 70%, 50%) 100%);
}

.message-content {
    padding: 8px 12px;
    border-radius: 12px;
    line-height: 1.5;
    font-size: 0.75rem;
    font-weight: 400;
}

.message.assistant .message-content {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-bottom-left-radius: 4px;
}

.message.user .message-content {
    background: var(--primary-color);
    color: white;
    border-bottom-right-radius: 4px;
}

/* 消息内容样式 */
.message-content p {
    margin-bottom: 8px;
}

.message-content p:last-child {
    margin-bottom: 0;
}

.message-content code {
    background: rgba(0, 0, 0, 0.05);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: "SF Mono", Monaco, monospace;
    font-size: 0.9em;
}

.message.user .message-content code {
    background: rgba(255, 255, 255, 0.2);
}

/* 输入区域 */
.chat-input-area {
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding: 8px 12px;
    background: var(--card-bg);
    border-top: 1px solid var(--border-color);
}

/* 图片预览区域 */
.image-preview-container {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
    padding: 8px;
    background: var(--bg-color);
    border-radius: 8px;
    border: 1px dashed var(--border-color);
}

.image-preview-container.hidden {
    display: none;
}

.image-preview-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.image-preview-item {
    position: relative;
    width: 60px;
    height: 60px;
    border-radius: 6px;
    overflow: hidden;
    flex-shrink: 0;
}

.image-preview-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.attachment-file-item {
    position: relative;
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 8px;
    height: 60px;
    min-width: 120px;
    max-width: 200px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    background: var(--card-bg);
}

.attachment-file-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 6px;
    background: var(--primary-soft);
    color: var(--text-color);
    font-size: 0.7rem;
    font-weight: 600;
}

.attachment-file-name {
    flex: 1;
    font-size: 0.75rem;
    color: var(--text-color);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.btn-remove-image {
    position: absolute;
    top: 2px;
    right: 2px;
    width: 20px;
    height: 20px;
    background: rgba(0, 0, 0, 0.6);
    color: white;
    border: none;
    border-radius: 50%;
    font-size: 12px;
    line-height: 1;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-remove-image:hover {
    background: rgba(220, 53, 69, 0.9);
}

.image-preview-hint {
    font-size: 0.7rem;
    color: var(--text-secondary);
}

/* 输入行 */
.input-row {
    display: flex;
    align-items: flex-end;
    gap: 8px;
}

/* + 按钮区域 */
.input-actions {
    position: relative;
    flex-shrink: 0;
}

.btn-plus {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s;
}

.btn-plus:hover {
    background: var(--primary-light);
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.btn-plus.active {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: white;
    transform: rotate(45deg);
}

/* 弹出菜单 */
.plus-menu {
    position: absolute;
    bottom: 100%;
    left: 0;
    margin-bottom: 8px;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    overflow: hidden;
    z-index: 100;
    min-width: 140px;
}

.plus-menu.hidden {
    display: none;
}

.plus-menu-item {
    display: flex;
    align-items: center;
    gap: 8px;
    width: 100%;
    padding: 10px 14px;
    background: none;
    border: none;
    font-size: 0.8rem;
    color: var(--text-color);
    cursor: pointer;
    transition: background 0.2s;
    text-align: left;
}

.plus-menu-item:hover {
    background: var(--bg-color);
}

.plus-menu-item svg {
    color: var(--text-secondary);
    flex-shrink: 0;
}

.plus-menu-item:hover svg {
    color: var(--primary-color);
}

.chat-input-area textarea {
    flex: 1;
    padding: 5px 7px;
    border: 1px solid var(--border-color);
    border-radius: 10px;
    font-size: 0.75rem;
    font-family: inherit;
    font-weight: 400;
    resize: none;
    outline: none;
    transition: border-color 0.2s;
    max-height: 80px;
    min-height: 20px;
}

.chat-input-area textarea:focus {
    border-color: var(--primary-color);
}

.btn-send {
    padding: 8px 14px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 10px;
    font-size: 0.75rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    height: fit-content;
    align-self: flex-end;
}

.btn-send:hover {
    background: var(--primary-hover);
}

.btn-send:disabled {
    background: var(--text-secondary);
    cursor: not-allowed;
}

/* 加载动画 */
.typing-indicator {
    display: flex;
    gap: 4px;
    padding: 8px 0;
}

.typing-indicator span {
    width: 8px;
    height: 8px;
    background: var(--text-secondary);
    border-radius: 50%;
    animation: typing 1.4s infinite ease-in-out both;
}

.typing-indicator span:nth-child(1) {
    animation-delay: -0.32s;
}

.typing-indicator span:nth-child(2) {
    animation-delay: -0.16s;
}

@keyframes typing {
    0%, 80%, 100% {
        transform: scale(0);
    }
    40% {
        transform: scale(1);
    }
}

/* 响应式 */
@media (max-width: 768px) {
    .sidebar {
        width: 100%;
        position: fixed;
        left: -100%;
        z-index: 100;
        transition: left 0.3s;
    }

    .sidebar.open {
        left: 0;
    }

    .message {
        max-width: 90%;
    }

    .features {
        flex-direction: row;
        gap: 8px;
    }

    .feature {
        flex: 1;
        min-width: 0;
        padding: 8px 10px;
    }

    .feature .icon {
        font-size: 1rem;
    }

    .feature span:last-child {
        font-size: 0.6875rem;
    }

    .login-form .form-row {
        flex-direction: column;
        gap: 8px;
    }

    .welcome-content h2,
    .prompt-content h2 {
        font-size: 0.9375rem;
    }

    .welcome-content p,
    .prompt-content p {
        font-size: 0.75rem;
    }

    .btn-primary {
        padding: 9px 20px;
        font-size: 0.75rem;
    }

    .mode-cards {
        grid-template-columns: 1fr;
        gap: 8px;
    }

    .points-rules {
        padding: 10px 12px;
    }

    .rules-grid {
        font-size: 0.625rem;
    }

    /* 统计面板在移动端调整 */
    .stats-overview {
        grid-template-columns: repeat(2, 1fr);
        gap: 10px;
    }

    .overview-card {
        padding: 12px;
    }

    .overview-card .overview-value {
        font-size: 1.5rem;
    }

    .overview-card .overview-label {
        font-size: 0.625rem;
    }

    .stats-content {
        padding: 12px;
    }

    .stats-section {
        padding: 12px;
        margin-bottom: 12px;
    }

    /* 聊天界面调整 */
    .chat-header {
        padding: 5px 10px;
        gap: 6px;
        min-height: 32px;
    }

    .chat-messages {
        padding: 8px;
        gap: 6px;
    }

    .message-avatar {
        width: 24px;
        height: 24px;
        font-size: 0.75rem;
    }

    .message-content {
        padding: 6px 10px;
        font-size: 0.67rem;
    }

    .chat-input-area {
        padding: 6px 10px;
        gap: 6px;
    }

    .chat-input-area textarea {
        padding: 4px 6px;
        font-size: 0.67rem;
        min-height: 17px;
    }

    .btn-send {
        padding: 6px 12px;
        font-size: 0.6875rem;
    }
}

/* ===== 数学公式样式 (KaTeX) ===== */
.message-content .katex-display {
    display: block;
    margin: 16px 0;
    padding: 16px 20px;
    background: linear-gradient(135deg, #f8f9ff 0%, #f0f4ff 100%);
    border-radius: 12px;
    border-left: 4px solid var(--primary-color);
    overflow-x: auto;
    text-align: center;
}

.message-content .katex-inline {
    display: inline;
    padding: 2px 4px;
    background: rgba(79, 70, 229, 0.08);
    border-radius: 4px;
}

.message-content .katex {
    font-size: 1.1em;
}

.message-content .katex-display .katex {
    font-size: 1.25em;
}

/* 用户消息中的公式 */
.message.user .message-content .katex-display {
    background: rgba(255, 255, 255, 0.15);
    border-left-color: rgba(255, 255, 255, 0.5);
}

.message.user .message-content .katex-inline {
    background: rgba(255, 255, 255, 0.2);
}

.message.user .message-content .katex {
    color: white;
}

/* 公式渲染错误样式 */
.message-content .latex-error {
    padding: 12px 16px;
    background: #fff5f5;
    border: 1px solid #fed7d7;
    border-radius: 8px;
    color: #c53030;
    font-family: "SF Mono", Monaco, monospace;
    font-size: 0.9em;
}

/* ===== 代码块样式 (highlight.js) ===== */
.message-content .code-block {
    position: relative;
    margin: 16px 0;
    border-radius: 12px;
    overflow: hidden;
    background: #1e293b;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

.message-content .code-block .code-lang {
    position: absolute;
    top: 8px;
    right: 12px;
    font-size: 0.7rem;
    color: #94a3b8;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 600;
}

.message-content .code-block pre {
    margin: 0;
    padding: 20px;
    padding-top: 32px;
    overflow-x: auto;
}

.message-content .code-block code {
    font-family: "SF Mono", "Fira Code", Monaco, monospace;
    font-size: 0.875rem;
    line-height: 1.7;
    background: transparent;
    padding: 0;
    color: #e2e8f0;
}

/* 行内代码样式 */
.message-content .inline-code {
    font-family: "SF Mono", Monaco, monospace;
    font-size: 0.9em;
    padding: 3px 8px;
    background: linear-gradient(135deg, #f1f5f9 0%, #e2e8f0 100%);
    border-radius: 6px;
    color: #4f46e5;
    border: 1px solid #e2e8f0;
}

.message.user .message-content .inline-code {
    background: rgba(255, 255, 255, 0.2);
    border-color: rgba(255, 255, 255, 0.3);
    color: white;
}

/* 图片渲染样式 */
.message-content .ai-image {
    margin: 14px 0;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 12px;
    text-align: center;
}

.message-content .ai-image img {
    max-width: 100%;
    border-radius: 10px;
    display: block;
    margin: 0 auto;
}

.message-content .ai-image figcaption {
    margin-top: 8px;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.message-content .image-error {
    margin: 12px 0;
    padding: 12px;
    border: 1px dashed var(--border-color);
    background: rgba(244, 67, 54, 0.08);
    color: var(--danger-color);
    border-radius: 8px;
    text-align: center;
    font-size: 0.9rem;
}

/* ===== 图形/图片放大预览 ===== */
body.preview-open {
    overflow: hidden;
}

.media-preview-overlay {
    position: fixed;
    inset: 0;
    background: rgba(15, 23, 42, 0.85);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1200;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.25s ease;
    padding: 24px;
}

.media-preview-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

.media-preview-content {
    background: var(--card-bg);
    border-radius: 16px;
    width: min(960px, 100%);
    max-width: 100%;
    max-height: 100%;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-lg);
    position: relative;
    padding: 32px 32px 24px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.media-preview-close {
    position: absolute;
    top: 12px;
    right: 12px;
    border: none;
    background: rgba(15, 23, 42, 0.08);
    color: var(--text-primary);
    font-size: 1.5rem;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    cursor: pointer;
    line-height: 1;
}

.media-preview-body {
    flex: 1;
    overflow: auto;
    max-height: calc(90vh - 120px);
}

.media-preview-body img,
.media-preview-body svg,
.media-preview-body canvas {
    max-width: 100%;
}

.media-preview-image-wrapper {
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: auto;
    max-height: 70vh;
}

.media-preview-image {
    width: 100%;
    border-radius: 12px;
    box-shadow: var(--shadow);
    transition: transform 0.15s ease;
}

.media-preview-caption {
    margin-top: 12px;
    color: var(--text-secondary);
    text-align: center;
    font-size: 0.95rem;
}

.media-preview-diagram,
.media-preview-geometry {
    background: var(--card-bg);
    border-radius: 12px;
    border: 1px solid var(--border-color);
    padding: 12px;
}

.media-preview-geometry .geometry-board {
    height: 500px;
    max-height: 70vh;
}

.media-preview-toolbar {
    position: absolute;
    top: 24px;
    right: 24px;
    display: none;
    align-items: center;
    gap: 12px;
    padding: 10px 16px;
    border-radius: 999px;
    border: 1px solid rgba(148, 163, 184, 0.4);
    background: rgba(15, 23, 42, 0.75);
    font-size: 0.85rem;
    color: #f8fafc;
    backdrop-filter: blur(6px);
    box-shadow: 0 4px 16px rgba(15, 23, 42, 0.4);
    z-index: 2;
}

.media-preview-toolbar.active {
    display: flex;
}

.media-preview-actions {
    display: flex;
    gap: 6px;
}

.toolbar-btn {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: 1px solid rgba(255, 255, 255, 0.4);
    background: rgba(255, 255, 255, 0.08);
    color: #f8fafc;
    font-size: 1.1rem;
    cursor: pointer;
    transition: var(--transition-fast);
}

.toolbar-btn:hover {
    border-color: var(--secondary-color);
    color: var(--secondary-color);
    box-shadow: 0 4px 12px rgba(0, 242, 195, 0.3);
}

.media-preview-hint {
    font-size: 0.78rem;
    opacity: 0.9;
    white-space: nowrap;
}

@media (max-width: 768px) {
    .media-preview-content {
        padding: 20px;
    }

    .media-preview-toolbar {
        position: static;
        width: 100%;
        justify-content: center;
        flex-wrap: wrap;
    }

    .media-preview-hint {
        text-align: center;
        width: 100%;
    }

    .media-preview-geometry .geometry-board,
    .media-preview-body svg {
        max-height: 60vh;
    }
    .media-preview-image-wrapper {
        max-height: 60vh;
    }
}

/* ===== 物理单位和化学符号特殊样式 ===== */
.message-content .unit {
    font-style: normal;
    white-space: nowrap;
}

/* 分数样式增强 */
.message-content .katex .mfrac {
    padding: 0 2px;
}

/* ===== 响应式公式 ===== */
@media (max-width: 768px) {
    .message-content .katex-display {
        padding: 12px 16px;
        font-size: 0.95em;
    }

    .message-content .code-block pre {
        padding: 16px;
        padding-top: 28px;
    }

    .message-content .code-block code {
        font-size: 0.8rem;
    }
}

/* ===== 英语学科特殊样式 ===== */
.message-content .grammar-highlight {
    background: linear-gradient(180deg, transparent 60%, #fef3c7 60%);
    padding: 0 2px;
}

.message-content .vocab-word {
    color: var(--primary-color);
    font-weight: 600;
    border-bottom: 2px dotted var(--primary-color);
}

/* === 滚动条样式升级 === */
/* 适用于欢迎页面和选择提示页面 */
.welcome-page::-webkit-scrollbar,
.select-prompt::-webkit-scrollbar,
.chat-messages::-webkit-scrollbar,
.stats-content::-webkit-scrollbar,
.weekly-plan-content::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

.welcome-page::-webkit-scrollbar-track,
.select-prompt::-webkit-scrollbar-track,
.chat-messages::-webkit-scrollbar-track,
.stats-content::-webkit-scrollbar-track,
.weekly-plan-content::-webkit-scrollbar-track {
    background: rgba(0, 0, 0, 0.05);
    border-radius: 4px;
}

.welcome-page::-webkit-scrollbar-thumb,
.select-prompt::-webkit-scrollbar-thumb,
.chat-messages::-webkit-scrollbar-thumb,
.stats-content::-webkit-scrollbar-thumb,
.weekly-plan-content::-webkit-scrollbar-thumb {
    background: var(--gradient-main);
    border-radius: 4px;
    transition: var(--transition);
}

.welcome-page::-webkit-scrollbar-thumb:hover,
.select-prompt::-webkit-scrollbar-thumb:hover,
.chat-messages::-webkit-scrollbar-thumb:hover,
.stats-content::-webkit-scrollbar-thumb:hover,
.weekly-plan-content::-webkit-scrollbar-thumb:hover {
    background: var(--primary-light);
}

/* 通用滚动条样式 */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: rgba(0, 0, 0, 0.05);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb {
    background: var(--gradient-main);
    border-radius: 4px;
    transition: var(--transition);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-light);
}

/* 深色模式滚动条 */
[data-theme="dark"] ::-webkit-scrollbar-track,
[data-theme="dark"] .welcome-page::-webkit-scrollbar-track,
[data-theme="dark"] .select-prompt::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.05);
}

/* ===== 设置弹窗样式 ===== */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    animation: fadeIn 0.2s ease;
}

.modal-content {
    background: var(--card-bg);
    border-radius: 16px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    max-width: 500px;
    width: 90%;
    max-height: 85vh;
    overflow-y: auto;
    animation: slideUp 0.3s ease;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 24px;
    border-bottom: 1px solid var(--border-color);
}

.modal-header h3 {
    font-size: 1.25rem;
    margin: 0;
}

.modal-close {
    width: 32px;
    height: 32px;
    border: none;
    background: var(--bg-color);
    border-radius: 8px;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-secondary);
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-close:hover {
    background: var(--danger-color);
    color: white;
}

.modal-body {
    padding: 24px;
}

.config-status {
    padding: 12px 16px;
    border-radius: 8px;
    margin-bottom: 20px;
    font-size: 0.875rem;
}

.config-status.success {
    background: rgba(16, 185, 129, 0.1);
    color: var(--secondary-color);
    border: 1px solid rgba(16, 185, 129, 0.3);
}

.config-status.error {
    background: rgba(239, 68, 68, 0.1);
    color: var(--danger-color);
    border: 1px solid rgba(239, 68, 68, 0.3);
}

.config-status.info {
    background: rgba(79, 70, 229, 0.1);
    color: var(--primary-color);
    border: 1px solid rgba(79, 70, 229, 0.3);
}

.config-section {
    margin-top: 20px;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
}

.config-section h4 {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 16px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 6px;
    color: var(--text-primary);
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 12px 14px;
    border: 2px solid var(--border-color);
    border-radius: 10px;
    font-size: 0.9375rem;
    outline: none;
    transition: border-color 0.2s;
    background: var(--bg-color);
}

.form-group input:focus,
.form-group select:focus {
    border-color: var(--primary-color);
}

.form-group input::placeholder {
    color: var(--text-secondary);
    opacity: 0.6;
}

.form-actions {
    display: flex;
    gap: 12px;
    margin-top: 24px;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
    flex-wrap: wrap;
}

.form-actions .btn-secondary,
.form-actions .btn-primary {
    flex: 1;
    min-width: 100px;
}

/* 测试连接按钮特殊样式 */
.form-actions #testConnection {
    background: rgba(79, 70, 229, 0.1);
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.form-actions #testConnection:hover {
    background: rgba(79, 70, 229, 0.2);
}

/* 恢复默认按钮特殊样式 */
.form-actions #resetSettings {
    background: rgba(245, 158, 11, 0.1);
    border-color: var(--warning-color);
    color: var(--warning-color);
}

.form-actions #resetSettings:hover {
    background: rgba(245, 158, 11, 0.2);
}

/* ===== 历史会话面板 ===== */
.history-panel {
    padding: 16px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    margin-top: auto;
}

.history-panel h3 {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    opacity: 0.6;
    margin-bottom: 12px;
    padding: 0 8px;
}

.history-panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
    padding: 0 8px;
}

.history-panel-header h3 {
    margin: 0;
    padding: 0;
}

.history-view-all {
    background: none;
    border: none;
    color: var(--primary-color);
    font-size: 0.75rem;
    cursor: pointer;
    padding: 4px 8px;
    border-radius: 4px;
    transition: all 0.2s;
}

.history-view-all:hover {
    background: rgba(79, 70, 229, 0.1);
}

.history-panel ul {
    list-style: none;
    max-height: 200px;
    overflow-y: auto;
}

.history-panel li {
    padding: 10px 12px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 8px;
    margin-bottom: 6px;
    cursor: pointer;
    transition: all 0.2s;
}

.history-panel li:hover {
    background: rgba(255, 255, 255, 0.1);
}

.history-panel li.active {
    background: var(--primary-color);
}

.history-item-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 4px;
}

.history-item-subject {
    font-size: 0.8125rem;
    font-weight: 500;
}

.history-item-time {
    font-size: 0.6875rem;
    opacity: 0.6;
}

.history-item-chapter {
    font-size: 0.75rem;
    opacity: 0.7;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.history-item-meta {
    display: flex;
    gap: 8px;
    margin-top: 4px;
    font-size: 0.6875rem;
    opacity: 0.6;
}

.history-empty {
    text-align: center;
    padding: 20px;
    font-size: 0.8125rem;
    opacity: 0.5;
}

/* 响应式调整 */
@media (max-width: 768px) {
    .chat-header {
        padding: 12px 16px;
    }

    .chat-nav {
        width: 100%;
        order: -1;
    }

    .nav-btn {
        flex: 1;
        justify-content: center;
    }
}

/* ===== 积分动画提示 ===== */
.points-toast {
    position: fixed;
    top: 20%;
    left: 50%;
    transform: translateX(-50%);
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
    color: white;
    padding: 16px 32px;
    border-radius: 50px;
    font-size: 1.25rem;
    font-weight: bold;
    box-shadow: 0 10px 40px rgba(16, 185, 129, 0.4);
    z-index: 9999;
    animation: pointsPopIn 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

.points-toast.star {
    background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
    box-shadow: 0 10px 40px rgba(245, 158, 11, 0.4);
}

.points-toast.success {
    background: linear-gradient(135deg, #8b5cf6 0%, #7c3aed 100%);
    box-shadow: 0 10px 40px rgba(139, 92, 246, 0.4);
}

.points-toast.fade-out {
    animation: pointsFadeOut 0.3s ease forwards;
}

@keyframes pointsPopIn {
    0% {
        opacity: 0;
        transform: translateX(-50%) scale(0.5) translateY(20px);
    }
    100% {
        opacity: 1;
        transform: translateX(-50%) scale(1) translateY(0);
    }
}

@keyframes pointsFadeOut {
    0% {
        opacity: 1;
        transform: translateX(-50%) scale(1) translateY(0);
    }
    100% {
        opacity: 0;
        transform: translateX(-50%) scale(0.8) translateY(-20px);
    }
}

/* ===== 学习统计面板 ===== */
.stats-dashboard {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.stats-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 18px;
    background: var(--card-bg);
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow);
}

.stats-header h2 {
    font-size: 0.9375rem;
    margin: 0;
    font-weight: 600;
}

.stats-header .btn-back {
    margin: 0;
    background: var(--bg-color);
    color: var(--text-primary);
}

.stats-content {
    flex: 1;
    overflow-y: auto;
    padding: 16px;
}

/* 总体概览卡片 */
.stats-overview {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
    margin-bottom: 16px;
}

.overview-card {
    background: var(--card-bg);
    border-radius: 14px;
    padding: 16px;
    text-align: center;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
}

.overview-card .overview-value {
    display: block;
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 6px;
}

.overview-card:nth-child(2) .overview-value {
    color: var(--warning-color);
}

.overview-card:nth-child(3) .overview-value {
    color: var(--secondary-color);
}

.overview-card:nth-child(4) .overview-value {
    color: var(--danger-color);
}

.overview-card .overview-label {
    font-size: 0.6875rem;
    color: var(--text-secondary);
    font-weight: 400;
}

.overview-card.clickable {
    cursor: pointer;
    transition: all 0.2s;
}

.overview-card.clickable:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.15);
    border-color: var(--primary-color);
}

/* 统计区块 */
.stats-section {
    background: var(--card-bg);
    border-radius: 14px;
    padding: 16px;
    margin-bottom: 16px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
}

.stats-section h3 {
    font-size: 0.8125rem;
    margin-bottom: 12px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--border-color);
    font-weight: 600;
}

/* 学习建议 */
.recommendations-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.recommendation-item {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    padding: 12px;
    background: var(--bg-color);
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.2s;
}

.recommendation-item:hover {
    transform: translateX(3px);
    box-shadow: var(--shadow);
}

.recommendation-item .rec-icon {
    font-size: 1.25rem;
    flex-shrink: 0;
}

.recommendation-item .rec-content {
    flex: 1;
}

.recommendation-item .rec-title {
    font-weight: 600;
    margin-bottom: 3px;
    font-size: 0.8125rem;
}

.recommendation-item .rec-desc {
    font-size: 0.6875rem;
    color: var(--text-secondary);
}

.recommendation-item.warning {
    background: rgba(239, 68, 68, 0.08);
    border-left: 4px solid var(--danger-color);
}

.recommendation-item.info {
    background: rgba(79, 70, 229, 0.08);
    border-left: 4px solid var(--primary-color);
}

.recommendation-item.star {
    background: rgba(245, 158, 11, 0.08);
    border-left: 4px solid var(--warning-color);
}

.recommendation-item.success {
    background: rgba(16, 185, 129, 0.08);
    border-left: 4px solid var(--secondary-color);
}

.recommendation-item.start {
    background: rgba(139, 92, 246, 0.08);
    border-left: 4px solid #8b5cf6;
}

/* 科目进度列表 */
.subject-progress-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.subject-progress-item {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.subject-progress-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.subject-progress-name {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 500;
}

.subject-progress-name .icon {
    font-size: 1.25rem;
}

.subject-progress-stats {
    display: flex;
    gap: 16px;
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.progress-bar-container {
    height: 8px;
    background: var(--bg-color);
    border-radius: 4px;
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color) 0%, #818cf8 100%);
    border-radius: 4px;
    transition: width 0.5s ease;
}

/* 错题分布 */
.wrong-distribution {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}

.wrong-chart-container h4 {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 16px;
}

.wrong-chart {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.chart-bar-item {
    display: flex;
    align-items: center;
    gap: 12px;
}

.chart-bar-label {
    width: 80px;
    font-size: 0.8125rem;
    flex-shrink: 0;
}

.chart-bar-wrapper {
    flex: 1;
    height: 24px;
    background: var(--bg-color);
    border-radius: 12px;
    overflow: hidden;
    position: relative;
}

.chart-bar-fill {
    height: 100%;
    border-radius: 12px;
    transition: width 0.5s ease;
    display: flex;
    align-items: center;
    justify-content: flex-end;
    padding-right: 8px;
    min-width: 32px;
}

.chart-bar-fill.subject-math { background: linear-gradient(90deg, #4f46e5 0%, #818cf8 100%); }
.chart-bar-fill.subject-chinese { background: linear-gradient(90deg, #ef4444 0%, #f87171 100%); }
.chart-bar-fill.subject-english { background: linear-gradient(90deg, #10b981 0%, #34d399 100%); }
.chart-bar-fill.subject-physics { background: linear-gradient(90deg, #f59e0b 0%, #fbbf24 100%); }
.chart-bar-fill.subject-default { background: linear-gradient(90deg, #8b5cf6 0%, #a78bfa 100%); }

.chart-bar-fill.difficulty-basic { background: linear-gradient(90deg, #10b981 0%, #34d399 100%); }
.chart-bar-fill.difficulty-medium { background: linear-gradient(90deg, #f59e0b 0%, #fbbf24 100%); }
.chart-bar-fill.difficulty-hard { background: linear-gradient(90deg, #ef4444 0%, #f87171 100%); }

.chart-bar-value {
    font-size: 0.75rem;
    font-weight: 600;
    color: white;
}

/* 章节星星详情 */
.chapter-stars-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 12px;
}

.chapter-star-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 16px;
    background: var(--bg-color);
    border-radius: 10px;
}

.chapter-star-name {
    font-size: 0.875rem;
    display: flex;
    flex-direction: column;
}

.chapter-star-name .subject-tag {
    font-size: 0.6875rem;
    color: var(--text-secondary);
}

.chapter-star-stars {
    font-size: 1rem;
    color: var(--warning-color);
}

.chapter-star-item.completed {
    background: rgba(16, 185, 129, 0.1);
    border: 1px solid rgba(16, 185, 129, 0.2);
}

/* 空状态 */
.empty-state {
    text-align: center;
    padding: 40px;
    color: var(--text-secondary);
}

.empty-state .icon {
    font-size: 3rem;
    margin-bottom: 16px;
    opacity: 0.5;
}

.empty-state p {
    font-size: 0.9375rem;
}

/* 加载状态 */
.stats-section .loading {
    text-align: center;
    padding: 24px;
    color: var(--text-secondary);
}

/* 响应式 */
@media (max-width: 768px) {
    .stats-overview {
        grid-template-columns: repeat(2, 1fr);
    }

    .wrong-distribution {
        grid-template-columns: 1fr;
    }

    .chapter-stars-list {
        grid-template-columns: 1fr;
    }

    .overview-card .overview-value {
        font-size: 1.75rem;
    }
}


/* 作文批改面板 */
.essay-panel {
    padding: 24px;
}

.essay-panel-content {
    background: var(--card-bg);
    border-radius: 16px;
    padding: 20px;
    box-shadow: var(--shadow);
}

.essay-panel-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 20px;
}

.essay-subtitle {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.essay-upload {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
    margin-bottom: 16px;
}

.essay-hint {
    color: var(--text-muted);
    font-size: 0.85rem;
}

.essay-ocr {
    background: var(--bg-card);
    border-radius: 12px;
    padding: 12px;
    margin-bottom: 16px;
}

.essay-ocr-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
    color: var(--text-secondary);
}

.essay-ocr textarea {
    width: 100%;
    min-height: 160px;
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 12px;
    color: var(--text-primary);
    font-size: 0.95rem;
    line-height: 1.6;
    resize: vertical;
}

.essay-checkbox {
    display: flex;
    align-items: center;
    gap: 6px;
    color: var(--text-secondary);
    font-size: 0.85rem;
}


.essay-progress {
    position: relative;
    height: 10px;
    background: var(--border-color);
    border-radius: 999px;
    overflow: hidden;
    margin-bottom: 16px;
}

.essay-progress-bar {
    height: 100%;
    width: 0%;
    background: var(--primary-gradient, var(--primary-color));
    transition: width 0.3s ease;
}

.essay-progress-text {
    position: absolute;
    right: 10px;
    top: -22px;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.essay-actions {
    margin-bottom: 20px;
}

.essay-result {
    display: grid;
    gap: 16px;
}

.essay-section {
    background: var(--bg-card);
    border-radius: 12px;
    padding: 12px;
}

.essay-score {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.essay-score-item {
    background: var(--primary-color);
    color: #fff;
    padding: 6px 10px;
    border-radius: 999px;
    font-size: 0.85rem;
}

.essay-summary {
    color: var(--text-primary);
    line-height: 1.6;
}

.essay-weaknesses {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.essay-tag {
    background: var(--primary-color);
    color: #fff;
    padding: 4px 8px;
    border-radius: 999px;
    font-size: 0.8rem;
}

.essay-sentence {
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 10px;
    margin-bottom: 8px;
}

.essay-sentence:last-child

.essay-stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 12px;
    margin-bottom: 12px;
}

.essay-stat-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 12px;
}

.essay-stat-value {
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--text-primary);
}

.essay-stat-label {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.essay-stats-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.essay-stats-block {
    background: var(--bg-card);
    border-radius: 12px;
    padding: 12px;
}

.essay-stats-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.essay-stats-tag {
    background: var(--primary-color);
    color: #fff;
    padding: 4px 8px;
    border-radius: 999px;
    font-size: 0.8rem;
}

.essay-stats-trend {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.essay-trend-item {
    display: flex;
    justify-content: space-between;
    color: var(--text-secondary);
    font-size: 0.85rem;
}

.essay-stats-empty

.essay-history-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 8px;
    margin-bottom: 8px;
}

.essay-history {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.essay-history-item {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 8px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 10px;
}

.essay-history-meta {
    display: flex;
    flex-direction: column;
    gap: 4px;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.essay-history-title {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.9rem;
}

.essay-history-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.essay-history-tag {
    background: var(--primary-color);
    color: #fff;
    padding: 2px 6px;
    border-radius: 999px;
    font-size: 0.75rem;
}

.essay-history-actions {
    display: flex;
    gap: 6px;
}

.essay-history-empty {
    color: var(--text-muted);
    font-size: 0.85rem;
}

 {
    color: var(--text-muted);
    font-size: 0.85rem;
}

@media (max-width: 768px) {
    .essay-stats-row {
        grid-template-columns: 1fr;
    }
}
 {
    margin-bottom: 0;
}

.sentence-text {
    margin-bottom: 6px;
    color: var(--text-primary);
}

.sentence-issues {
    margin: 0;
    padding-left: 16px;
    color: var(--text-secondary);
    font-size: 0.85rem;
}

/* 隐藏元素类 */
.hidden {
    display: none !important;
}

/* ===== 几何图形样式 (JSXGraph) ===== */
.geometry-container {
    margin: 16px 0;
    border-radius: 12px;
    overflow: hidden;
    background: #fafbfc;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow);
}

.geometry-board {
    width: 100%;
    height: 300px;
    min-height: 250px;
}

.geometry-error {
    padding: 20px;
    text-align: center;
    color: var(--danger-color);
    font-size: 0.875rem;
}

/* 响应式几何图形 */
@media (max-width: 768px) {
    .geometry-board {
        height: 250px;
    }
}

/* ===== 错误消息和重试按钮 ===== */
.message.error-message .message-content {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.3);
}

.error-text {
    color: var(--danger-color);
    margin-bottom: 12px;
}

.btn-retry {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 10px 20px;
    background: var(--danger-color);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-retry:hover {
    background: #dc2626;
    transform: translateY(-1px);
}

/* ===== 薄弱环节分析样式 ===== */
.weakness-desc {
    font-size: 0.8125rem;
    color: var(--text-secondary);
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 1px dashed var(--border-color);
}

.weakness-analysis-container {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.weakness-chapter-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.weakness-chapter-item {
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding: 16px;
    background: var(--bg-color);
    border-radius: 12px;
    border-left: 4px solid var(--danger-color);
    transition: all 0.2s;
}

.weakness-chapter-item:hover {
    box-shadow: var(--shadow);
    transform: translateX(4px);
}

.weakness-chapter-item.level-high {
    border-left-color: #ef4444;
    background: rgba(239, 68, 68, 0.05);
}

.weakness-chapter-item.level-medium {
    border-left-color: #f59e0b;
    background: rgba(245, 158, 11, 0.05);
}

.weakness-chapter-item.level-low {
    border-left-color: #10b981;
    background: rgba(16, 185, 129, 0.05);
}

.weakness-chapter-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.weakness-chapter-name {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 600;
}

.weakness-chapter-name .subject-icon {
    font-size: 1.25rem;
}

.weakness-chapter-name .chapter-text {
    font-size: 0.9375rem;
}

.weakness-level-badge {
    padding: 4px 10px;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
}

.weakness-level-badge.high {
    background: rgba(239, 68, 68, 0.15);
    color: #dc2626;
}

.weakness-level-badge.medium {
    background: rgba(245, 158, 11, 0.15);
    color: #d97706;
}

.weakness-level-badge.low {
    background: rgba(16, 185, 129, 0.15);
    color: #059669;
}

.weakness-chapter-stats {
    display: flex;
    gap: 16px;
    font-size: 0.8125rem;
    color: var(--text-secondary);
}

.weakness-chapter-stats .stat-item {
    display: flex;
    align-items: center;
    gap: 4px;
}

.weakness-chapter-stats .stat-item.danger {
    color: var(--danger-color);
}

.weakness-chapter-stats .stat-item.warning {
    color: var(--warning-color);
}

.weakness-chapter-stats .stat-item.success {
    color: var(--secondary-color);
}

.weakness-difficulty-breakdown {
    display: flex;
    gap: 8px;
    margin-top: 4px;
}

.difficulty-tag {
    padding: 3px 8px;
    border-radius: 6px;
    font-size: 0.75rem;
    font-weight: 500;
}

.difficulty-tag.basic {
    background: rgba(16, 185, 129, 0.15);
    color: #059669;
}

.difficulty-tag.medium {
    background: rgba(245, 158, 11, 0.15);
    color: #d97706;
}

.difficulty-tag.hard {
    background: rgba(239, 68, 68, 0.15);
    color: #dc2626;
}

.weakness-weight-bar {
    height: 6px;
    background: var(--border-color);
    border-radius: 3px;
    overflow: hidden;
    margin-top: 8px;
}

.weakness-weight-fill {
    height: 100%;
    border-radius: 3px;
    background: linear-gradient(90deg, var(--danger-color) 0%, var(--warning-color) 100%);
    transition: width 0.5s ease;
}

.weakness-summary {
    padding: 16px;
    background: linear-gradient(135deg, rgba(79, 70, 229, 0.08) 0%, rgba(139, 92, 246, 0.08) 100%);
    border-radius: 12px;
    border: 1px solid rgba(79, 70, 229, 0.15);
}

.weakness-summary h4 {
    font-size: 0.875rem;
    color: var(--primary-color);
    margin-bottom: 12px;
}

.weakness-summary-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
}

.summary-stat-item {
    text-align: center;
}

.summary-stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

.summary-stat-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

/* 响应式 */
@media (max-width: 768px) {
    .weakness-summary-stats {
        grid-template-columns: 1fr;
        gap: 8px;
    }

    .weakness-chapter-stats {
        flex-wrap: wrap;
        gap: 8px;
    }
}

/* ===== 全部历史会话面板 ===== */
.all-history-panel {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.all-history-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 24px;
    background: var(--card-bg);
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow);
}

.all-history-header h2 {
    font-size: 1.25rem;
    margin: 0;
}

.all-history-header .btn-back {
    margin: 0;
    background: var(--bg-color);
    color: var(--text-primary);
}

.all-history-filters {
    display: flex;
    gap: 12px;
    padding: 16px 24px;
    background: var(--card-bg);
    border-bottom: 1px solid var(--border-color);
}

.all-history-filters select {
    padding: 10px 14px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 0.875rem;
    background: var(--bg-color);
    color: var(--text-primary);
    cursor: pointer;
    transition: border-color 0.2s;
}

.all-history-filters select:focus {
    border-color: var(--primary-color);
    outline: none;
}

.all-history-list {
    flex: 1;
    overflow-y: auto;
    padding: 24px;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 16px;
    align-content: start;
}

.history-card {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 16px 20px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
    cursor: pointer;
    transition: all 0.2s;
}

.history-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.1);
    border-color: var(--primary-color);
}

.history-card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 12px;
}

.history-card-subject {
    display: flex;
    align-items: center;
    gap: 8px;
}

.history-card-subject .icon {
    font-size: 1.5rem;
}

.history-card-subject .name {
    font-weight: 600;
    font-size: 1rem;
}

.history-card-type {
    padding: 4px 10px;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
}

.history-card-type.learn {
    background: rgba(79, 70, 229, 0.1);
    color: var(--primary-color);
}

.history-card-type.diagnosis {
    background: rgba(139, 92, 246, 0.1);
    color: #8b5cf6;
}

.history-card-type.exam {
    background: rgba(236, 72, 153, 0.1);
    color: #ec4899;
}

.history-card-chapter {
    font-size: 0.9375rem;
    color: var(--text-primary);
    margin-bottom: 12px;
}

.history-card-meta {
    display: flex;
    gap: 16px;
    font-size: 0.8125rem;
    color: var(--text-secondary);
}

.history-card-meta span {
    display: flex;
    align-items: center;
    gap: 4px;
}

.history-card-time {
    margin-top: 12px;
    padding-top: 12px;
    border-top: 1px solid var(--border-color);
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.all-history-pagination {
    padding: 16px 24px;
    text-align: center;
    background: var(--card-bg);
    border-top: 1px solid var(--border-color);
}

.all-history-empty {
    grid-column: 1 / -1;
    text-align: center;
    padding: 60px 20px;
    color: var(--text-secondary);
}

.all-history-empty .icon {
    font-size: 3rem;
    margin-bottom: 16px;
    opacity: 0.5;
}

.all-history-empty p {
    font-size: 1rem;
}

/* 响应式 */
@media (max-width: 768px) {
    .all-history-filters {
        flex-direction: column;
    }

    .all-history-list {
        grid-template-columns: 1fr;
        padding: 16px;
    }
}

/* ===== 移动端导航系统 ===== */

/* 侧边栏遮罩层 */
.sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 99;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.sidebar-overlay.active {
    display: block;
    opacity: 1;
}

/* 移动端顶部导航 - 现代化设计 */
.mobile-header {
    display: none;
    position: sticky;
    top: 0;
    z-index: 50;
    height: 48px;
    padding: 0 14px;
    background: rgba(255, 255, 255, 0.92);
    border-bottom: 1px solid rgba(0, 0, 0, 0.06);
    align-items: center;
    justify-content: space-between;

    /* 毛玻璃效果 */
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    backdrop-filter: saturate(180%) blur(20px);
}

/* 深色模式顶部导航 */
[data-theme="dark"] .mobile-header {
    background: rgba(26, 26, 26, 0.92);
    border-bottom-color: rgba(255, 255, 255, 0.08);
}

.hamburger-btn {
    width: 46px;
    height: 46px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    cursor: pointer;
    border-radius: 6px;
    transition: background 0.2s;
}

.hamburger-btn:hover {
    background: var(--border-color);
}

.hamburger-icon {
    display: block;
    width: 18px;
    height: 2px;
    background: var(--text-primary);
    position: relative;
    transition: background 0.2s;
}

.hamburger-icon::before,
.hamburger-icon::after {
    content: '';
    position: absolute;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--text-primary);
    transition: transform 0.3s ease;
}

.hamburger-icon::before {
    top: -5px;
}

.hamburger-icon::after {
    bottom: -5px;
}

/* 汉堡菜单激活状态动画 */
.hamburger-btn.active .hamburger-icon {
    background: transparent;
}

.hamburger-btn.active .hamburger-icon::before {
    transform: rotate(45deg) translate(4px, 4px);
}

.hamburger-btn.active .hamburger-icon::after {
    transform: rotate(-45deg) translate(4px, -4px);
}

.mobile-logo {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: -0.01em;
}

.mobile-actions {
    display: flex;
    align-items: center;
    gap: 6px;
}

.mobile-points {
    font-size: 0.6875rem;
    color: var(--primary-color);
    font-weight: 500;
}

.theme-toggle {
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    cursor: pointer;
    border-radius: 6px;
    font-size: 1rem;
    transition: background 0.2s, transform 0.2s;
}

.theme-toggle:hover {
    background: var(--border-color);
}

.theme-toggle:active {
    transform: scale(0.9);
}

/* 移动端底部Tab导航 - 现代化设计 */
.mobile-tab-bar {
    display: none;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: 52px;
    background: rgba(255, 255, 255, 0.92);
    border-top: 1px solid rgba(0, 0, 0, 0.06);
    z-index: 1001; /* 提高z-index确保在所有内容之上 */

    /* iOS安全区域适配 */
    padding-bottom: env(safe-area-inset-bottom);
    padding-bottom: constant(safe-area-inset-bottom);

    /* 毛玻璃效果 */
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    backdrop-filter: saturate(180%) blur(20px);

    /* 性能优化 */
    will-change: transform;
    transform: translateZ(0);

    /* 确保可见性 */
    visibility: visible;
    opacity: 1;
    pointer-events: auto;
}

/* Tab按钮 */
.tab-item {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2px;
    padding: 6px 3px 8px;
    border: none;
    background: transparent;
    color: rgba(0, 0, 0, 0.45);
    cursor: pointer;
    position: relative;
    overflow: hidden;

    transition: color 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    outline: none;
    -webkit-tap-highlight-color: transparent;
    -webkit-user-select: none;
    user-select: none;
}

/* 触摸反馈 */
.tab-item:active {
    opacity: 0.7;
}

/* 激活状态 */
.tab-item.active {
    color: var(--primary-color);
}

/* 焦点状态 */
.tab-item:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: -2px;
    border-radius: 6px;
}

/* 图标容器 */
.tab-icon-wrapper {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    position: relative;
    transition: transform 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

/* SVG图标 */
.tab-icon {
    width: 20px;
    height: 20px;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 激活动画 */
.tab-item.active .tab-icon-wrapper {
    animation: tabIconBounce 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes tabIconBounce {
    0% { transform: scale(1); }
    50% { transform: scale(1.2); }
    100% { transform: scale(1); }
}

/* 激活图标增大 */
.tab-item.active .tab-icon {
    width: 26px;
    height: 26px;
    stroke-width: 2.2;
}

/* 文字标签 */
.tab-label {
    font-size: 0.5625rem;
    line-height: 1;
    font-weight: 400;
    letter-spacing: 0.2px;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 激活文字 */
.tab-item.active .tab-label {
    font-weight: 600;
}

/* 涟漪效果 */
.tab-item::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: currentColor;
    opacity: 0;
    transform: translate(-50%, -50%);
    transition: width 0.4s, height 0.4s, opacity 0.4s;
}

.tab-item:active::before {
    width: 56px;
    height: 56px;
    opacity: 0.1;
}

/* 激活指示条 */
.tab-item.active::after {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 20px;
    height: 3px;
    background: var(--primary-color);
    border-radius: 0 0 3px 3px;
    animation: indicatorSlide 0.3s ease-out;
}

@keyframes indicatorSlide {
    from {
        width: 0;
        opacity: 0;
    }
    to {
        width: 20px;
        opacity: 1;
    }
}

/* 徽章系统 */
.tab-item[data-badge]:not([data-badge=""])::before {
    content: attr(data-badge);
    position: absolute;
    top: 4px;
    right: calc(50% - 20px);
    min-width: 20px;
    height: 20px;
    padding: 0 5px;
    background: #ff4757;
    color: #ffffff;
    font-size: 10px;
    font-weight: 600;
    line-height: 18px;
    text-align: center;
    border-radius: 9px;
    border: 2px solid #ffffff;
    opacity: 1;
    transform: none;
    width: auto;
    animation: badgePop 0.3s ease-out;
}

@keyframes badgePop {
    0% { transform: scale(0); }
    50% { transform: scale(1.2); }
    100% { transform: scale(1); }
}

/* 深色模式 */
[data-theme="dark"] .mobile-tab-bar {
    background: rgba(26, 26, 26, 0.92);
    border-top-color: rgba(255, 255, 255, 0.08);
}

[data-theme="dark"] .tab-item {
    color: rgba(255, 255, 255, 0.55);
}

[data-theme="dark"] .tab-item.active {
    color: #60a5fa;
}

[data-theme="dark"] .tab-item.active::after {
    background: #60a5fa;
}

[data-theme="dark"] .tab-item[data-badge]:not([data-badge=""])::before {
    border-color: #1a1a1a;
}

/* ===== 移动端响应式优化 ===== */

@media (max-width: 768px) {
    /* 显示移动端导航 */
    .mobile-header {
        display: flex;
    }

    .mobile-tab-bar {
        display: flex !important; /* 强制显示 */
        justify-content: space-around;
        align-items: stretch;
    }

    /* 侧边栏移动端样式 */
    .sidebar {
        position: fixed;
        left: 0;
        top: 0;
        bottom: 0;
        width: 280px;
        transform: translateX(-100%);
        transition: transform 0.3s ease;
        z-index: 100;
    }

    .sidebar.open {
        transform: translateX(0);
    }

    /* 主内容区适配 - 为底部Tab留出空间 */
    .main-content {
        padding-bottom: calc(60px + env(safe-area-inset-bottom));
        min-height: 100vh;
        box-sizing: border-box;
    }

    /* 欢迎页面优化 - 确保可滚动 */
    .welcome-page,
    .select-prompt {
        padding: 20px 16px;
        /* 顶部导航56px + 底部Tab 60px + 安全区域 */
        max-height: calc(100vh - 56px - 60px - env(safe-area-inset-bottom));
        min-height: 0;
        box-sizing: border-box;
        overflow-y: auto !important;
        overflow-x: hidden;
         /* iOS平滑滚动 */
    }

    .welcome-content,
    .prompt-content {
        padding-bottom: 20px; /* 底部留白，避免内容紧贴底部 */
    }

    .welcome-content h2 {
        font-size: 1.5rem;
    }

    .features {
        flex-direction: column;
    }

    .feature-card {
        min-width: auto;
    }

    /* 登录表单优化 */
    .form-row {
        flex-direction: column;
        gap: 12px;
    }

    /* 模式选择卡片优化 */
    .mode-cards {
        grid-template-columns: 1fr;
        gap: 12px;
    }

    /* 聊天头部优化 */
    .chat-header {
        flex-wrap: wrap;
        padding: 12px 16px;
        gap: 8px;
    }

    .topic-info {
        flex: 1;
        min-width: 0;
    }

    .topic-info h3 {
        font-size: 0.9375rem;
    }

    .session-type-badge {
        font-size: 0.625rem;
    }

    /* 消息区域优化 */
    .chat-messages {
        padding: 12px;
    }

    .message {
        max-width: 100%;
    }

    .message-avatar {
        width: 32px;
        height: 32px;
        font-size: 1rem;
    }

    /* 输入区域优化 */
    .chat-input {
        padding: 12px;
    }

    .input-wrapper {
        gap: 8px;
    }

    /* 统计面板优化 */
    .stats-overview {
        grid-template-columns: repeat(2, 1fr);
        gap: 12px;
    }

    .stats-section {
        padding: 16px;
    }

    /* 积分规则优化 */
    .points-rules {
        grid-template-columns: 1fr;
    }

    /* 科目导航优化 */
    .subject-list {
        padding: 12px;
    }

    .subject-item {
        padding: 12px;
    }

    /* 章节面板优化 */
    .chapters-panel {
        padding: 12px;
    }

    .chapter-item {
        padding: 12px;
    }

    /* 弹窗优化 */
    .modal-content {
        width: 95%;
        max-height: 85vh;
        margin: 40px auto;
    }

    /* 底部导航时聊天容器优化 */
    .chat-container {
        height: calc(100vh - 56px - 60px - env(safe-area-inset-bottom));
        min-height: calc(100vh - 56px - 60px - env(safe-area-inset-bottom));
        max-height: calc(100vh - 56px - 60px - env(safe-area-inset-bottom));
    }

    /* 统计面板移动端适配 */
    .stats-dashboard {
        height: calc(100vh - 56px - 60px - env(safe-area-inset-bottom));
        overflow-y: auto;
    }

    .stats-content {
        padding-bottom: 20px;
    }

    /* 一周计划面板移动端适配 */
    .weekly-plan-panel {
        height: calc(100vh - 56px - 60px - env(safe-area-inset-bottom));
        overflow-y: auto;
    }

    .weekly-plan-content {
        padding-bottom: 20px;
    }

    /* 错题本面板移动端适配 */
    .wrong-book-panel {
        height: calc(100vh - 56px - 60px - env(safe-area-inset-bottom));
        overflow-y: auto;
    }

    .wrong-book-content {
        padding-bottom: 20px;
    }

    /* 科目导航移动端适配 */
    .subjects-nav.mobile-view {
        height: calc(100vh - 56px - 60px - env(safe-area-inset-bottom));
        overflow-y: auto;
    }

    /* 章节面板移动端适配 */
    .chapters-panel {
        height: calc(100vh - 56px - 60px - env(safe-area-inset-bottom));
        overflow-y: auto;
    }
}

/* 小屏手机优化 */
@media (max-width: 480px) {
    .mobile-logo {
        font-size: 1rem;
    }

    /* Tab导航小屏适配 */
    .mobile-tab-bar {
        height: 56px;
    }

    .tab-icon {
        width: 22px;
        height: 22px;
    }

    .tab-item.active .tab-icon {
        width: 24px;
        height: 24px;
    }

    .tab-label {
        font-size: 10px;
    }

    .tab-item {
        gap: 3px;
        padding: 6px 2px 8px;
    }

    .tab-item.active::after {
        width: 16px;
    }

    /* 主内容区小屏适配 */
    .main-content {
        padding-bottom: calc(56px + env(safe-area-inset-bottom));
    }

    /* 欢迎页面小屏适配 - 确保可滚动 */
    .welcome-page,
    .select-prompt {
        padding: 20px 16px;
        /* 顶部导航56px + 底部Tab 56px + 安全区域 */
        max-height: calc(100vh - 56px - 56px - env(safe-area-inset-bottom));
        min-height: 0;
        overflow-y: auto !important;
        overflow-x: hidden;
    }

    /* 聊天容器小屏适配 */
    .chat-container {
        height: calc(100vh - 56px - 56px - env(safe-area-inset-bottom));
        min-height: calc(100vh - 56px - 56px - env(safe-area-inset-bottom));
        max-height: calc(100vh - 56px - 56px - env(safe-area-inset-bottom));
    }

    /* 统计面板小屏适配 */
    .stats-dashboard {
        height: calc(100vh - 56px - 56px - env(safe-area-inset-bottom));
    }

    /* 一周计划面板小屏适配 */
    .weekly-plan-panel {
        height: calc(100vh - 56px - 56px - env(safe-area-inset-bottom));
    }

    /* 错题本面板小屏适配 */
    .wrong-book-panel {
        height: calc(100vh - 56px - 56px - env(safe-area-inset-bottom));
    }


    /* 作文批改面板小屏适配 */
    .essay-panel {
        height: calc(100vh - 56px - 56px - env(safe-area-inset-bottom));
        overflow-y: auto;
    }

    /* 科目导航小屏适配 */
    .subjects-nav.mobile-view {
        height: calc(100vh - 56px - 56px - env(safe-area-inset-bottom));
    }

    /* 章节面板小屏适配 */
    .chapters-panel {
        height: calc(100vh - 56px - 56px - env(safe-area-inset-bottom));
    }

    /* 统计概览在小屏幕上单列 */
    .stats-overview {
        grid-template-columns: 1fr;
    }

    .stat-card {
        padding: 16px;
    }

    /* 欢迎页面进一步优化 */
    .welcome-content h2 {
        font-size: 1.25rem;
    }

    .welcome-content p {
        font-size: 0.875rem;
    }

    /* 聊天界面进一步优化 */
    .message-text {
        font-size: 0.9375rem;
    }

    /* 按钮尺寸优化 */
    .btn-primary,
    .btn-secondary {
        padding: 10px 16px;
        font-size: 0.875rem;
    }
}

/* ===== 移动端Tab Bar可见性保障 ===== */
/* 确保在所有情况下Tab Bar都可见且不被遮挡 */
@media (max-width: 768px) {
    /* 强制Tab Bar始终可见 */
    .mobile-tab-bar {
        display: flex !important;
        visibility: visible !important;
        opacity: 1 !important;
        pointer-events: auto !important;
    }

    /* 确保没有元素遮挡Tab Bar */
    body {
        position: relative;
    }

    /* 所有全屏元素都要为Tab Bar留空间 */
    .app-container {
        padding-bottom: env(safe-area-inset-bottom);
    }

    /* 确保模态框不遮挡Tab Bar */
    .modal-overlay {
        z-index: 999; /* 低于Tab Bar的1001 */
    }

    /* 确保聊天输入框不遮挡Tab Bar */
    .chat-input {
        position: relative;
        z-index: 10;
        margin-bottom: 0;
    }

    /* 滚动容器都要留出底部空间 */
    .stats-content,
    .weekly-plan-content,
    .wrong-book-content,
    .essay-panel-content,
    .chapters-list,
    .subject-list {
        padding-bottom: calc(20px + env(safe-area-inset-bottom)) !important;
    }
}

/* ===== 深色模式特殊适配 ===== */

[data-theme="dark"] .card,
[data-theme="dark"] .stat-card,
[data-theme="dark"] .feature-card,
[data-theme="dark"] .mode-card,
[data-theme="dark"] .history-card {
    background: var(--card-bg);
    border-color: var(--border-color);
}

[data-theme="dark"] .welcome-page {
    background: var(--bg-color);
}

[data-theme="dark"] .message.user .message-content {
    background: var(--primary-color);
}

[data-theme="dark"] .message.assistant .message-content {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
}

[data-theme="dark"] input,
[data-theme="dark"] select,
[data-theme="dark"] textarea {
    background: var(--bg-color);
    border-color: var(--border-color);
    color: var(--text-primary);
}

[data-theme="dark"] input:focus,
[data-theme="dark"] select:focus,
[data-theme="dark"] textarea:focus {
    border-color: var(--primary-color);
}

[data-theme="dark"] .code-block {
    background: #0d1117;
}

[data-theme="dark"] .modal-content {
    background: var(--card-bg);
}

[data-theme="dark"] .settings-modal {
    background: var(--card-bg);
}

/* 深色模式下侧边栏样式调整 */
[data-theme="dark"] .sidebar {
    background: #111827;
}

/* 过渡动画平滑 */
.card,
.stat-card,
.feature-card,
.mode-card,
.history-card,
.welcome-page,
.modal-content,
input,
select,
textarea {
    transition: var(--theme-transition);
}

/* ===== 戏剧性入场动画系统 ===== */

/* 通用入场动画 */
@keyframes revealContent {
    from {
        opacity: 0;
        transform: translateY(30px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 入场动画类 */
.animated-enter {
    animation: revealContent 0.8s cubic-bezier(0.34, 1.56, 0.64, 1);
    animation-fill-mode: both;
}

/* 错开延迟 - 波浪式入场 */
.delay-1 { animation-delay: 100ms; }
.delay-2 { animation-delay: 200ms; }
.delay-3 { animation-delay: 300ms; }
.delay-4 { animation-delay: 400ms; }
.delay-5 { animation-delay: 500ms; }

/* 欢迎页面入场动画 */
.welcome-content {
    animation: fadeInUp 0.8s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.welcome-content h2 {
    animation: fadeInUp 0.6s ease-out 0ms both;
}

.welcome-content > p {
    animation: fadeInUp 0.6s ease-out 100ms both;
}

.login-form {
    animation: fadeInUp 0.6s ease-out 200ms both;
}

.features {
    animation: fadeInUp 0.6s ease-out 300ms both;
}

.points-rules {
    animation: fadeInUp 0.6s ease-out 400ms both;
}

/* 消息入场动画增强 */
@keyframes messageSlideIn {
    from {
        opacity: 0;
        transform: translateX(-20px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateX(0) scale(1);
    }
}

@keyframes messageSlideInRight {
    from {
        opacity: 0;
        transform: translateX(20px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateX(0) scale(1);
    }
}

.message {
    animation: messageSlideIn 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.message.user {
    animation-name: messageSlideInRight;
}

/* ===== 聊天界面气泡升级 ===== */
.message-content {
    padding: 10px 12px;
    border-radius: var(--border-radius);
    line-height: 1.7;
    position: relative;
}

.message.assistant .message-content {
    background: var(--card-bg);
    -webkit-backdrop-filter: blur(16px);
    backdrop-filter: blur(16px);
    border: 1px solid var(--border-light);
    border-bottom-left-radius: 6px;
}

.message.user .message-content {
    background: var(--gradient-main);
    border-bottom-right-radius: 6px;
    box-shadow: var(--shadow-primary);
}

/* 头像渐变光环 */
.message-avatar {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    flex-shrink: 0;
    position: relative;
}

.message.assistant .message-avatar {
    background: var(--gradient-main);
    box-shadow: 0 4px 16px rgba(102, 126, 234, 0.4);
}

.message.assistant .message-avatar::before {
    content: '';
    position: absolute;
    inset: -3px;
    border-radius: 50%;
    background: var(--gradient-main);
    z-index: -1;
    opacity: 0.3;
    animation: avatarPulse 2s ease-in-out infinite;
}

@keyframes avatarPulse {
    0%, 100% { transform: scale(1); opacity: 0.3; }
    50% { transform: scale(1.1); opacity: 0.1; }
}

.message.user .message-avatar {
    background: var(--gradient-accent);
    box-shadow: 0 4px 16px rgba(240, 147, 251, 0.4);
}

/* ===== 输入区域优化 ===== */
.chat-input-area {
    display: flex;
    gap: 12px;
    padding: 12px 14px;
    background: var(--card-bg);
    -webkit-backdrop-filter: blur(20px);
    backdrop-filter: blur(20px);
    border-top: 1px solid var(--border-light);
}

.chat-input-area textarea {
    flex: 1;
    padding: 8px 11px;
    background: rgba(255, 255, 255, 0.05);
    border: 2px solid var(--border-light);
    border-radius: var(--border-radius-sm);
    font-size: 0.75rem;
    font-family: inherit;
    resize: none;
    outline: none;
    transition: var(--transition);
    max-height: 120px;
    color: var(--text-primary);
}

.chat-input-area textarea:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(102, 126, 234, 0.15);
}

/* ===== 统计概览卡片升级 ===== */
.overview-card {
    background: var(--card-bg);
    -webkit-backdrop-filter: blur(20px);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-light);
    border-radius: var(--border-radius);
    padding: 28px;
    text-align: center;
    box-shadow: var(--shadow);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

/* 每个卡片独特的渐变装饰 */
.overview-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
}

.overview-card:nth-child(1)::before {
    background: var(--gradient-main);
}

.overview-card:nth-child(2)::before {
    background: linear-gradient(135deg, #ffd93d 0%, #ff9f43 100%);
}

.overview-card:nth-child(3)::before {
    background: var(--gradient-success);
}

.overview-card:nth-child(4)::before {
    background: var(--gradient-accent);
}

.overview-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.overview-card .overview-value {
    display: block;
    font-size: 3rem;
    font-weight: 700;
    background: var(--gradient-main);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 8px;
}

.overview-card:nth-child(2) .overview-value {
    background: linear-gradient(135deg, #ffd93d 0%, #ff9f43 100%);
    -webkit-background-clip: text;
    background-clip: text;
}

.overview-card:nth-child(3) .overview-value {
    background: var(--gradient-success);
    -webkit-background-clip: text;
    background-clip: text;
}

.overview-card:nth-child(4) .overview-value {
    background: var(--gradient-accent);
    -webkit-background-clip: text;
    background-clip: text;
}

/* ===== 进度条动画升级 ===== */
.progress-bar {
    height: 8px;
    background: var(--gradient-main);
    border-radius: 4px;
    transition: width 1s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.progress-bar::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(255, 255, 255, 0.3),
        transparent
    );
    animation: shimmer 2s infinite;
}

@keyframes shimmer {
    from { transform: translateX(-100%); }
    to { transform: translateX(100%); }
}

/* ===== 移动端底部Tab升级 ===== */
/* 注意：基础样式已在前面定义，这里只定义增强样式 */

/* 激活指示条升级为渐变 */
.tab-item.active::after {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 24px;
    height: 3px;
    background: var(--gradient-main);
    border-radius: 0 0 3px 3px;
    animation: indicatorSlide 0.3s ease-out;
}

/* ===== 深色模式增强适配 ===== */
[data-theme="dark"] .message.assistant .message-content {
    background: var(--card-bg);
    backdrop-filter: blur(16px);
    border: 1px solid var(--border-color);
}

[data-theme="dark"] .message.user .message-content {
    background: var(--gradient-main);
}

[data-theme="dark"] .chat-input-area {
    background: var(--card-bg);
    border-top-color: var(--border-color);
}

[data-theme="dark"] .chat-input-area textarea {
    background: rgba(255, 255, 255, 0.05);
    border-color: var(--border-color);
}

[data-theme="dark"] .overview-card {
    background: var(--card-bg);
    border-color: var(--border-color);
}

[data-theme="dark"] .feature {
    background: var(--card-bg);
    border-color: var(--border-color);
}

/* ===== 浅色模式光晕增强 ===== */
[data-theme="light"] .mode-card,
[data-theme="light"] .feature,
[data-theme="light"] .overview-card {
    box-shadow: 0 4px 20px rgba(102, 126, 234, 0.08);
}

[data-theme="light"] .mode-card:hover,
[data-theme="light"] .feature:hover,
[data-theme="light"] .overview-card:hover {
    box-shadow: 0 12px 40px rgba(102, 126, 234, 0.15);
}

/* ===== 一周学习计划表样式 ===== */
.weekly-plan-panel {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.weekly-plan-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 24px;
    background: var(--card-bg);
    -webkit-backdrop-filter: blur(20px);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow);
}

.weekly-plan-header h2 {
    font-size: 1.25rem;
    margin: 0;
    background: var(--gradient-main);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.weekly-plan-actions {
    display: flex;
    gap: 12px;
    align-items: center;
}

.weekly-plan-actions .btn-back {
    margin: 0;
    background: var(--bg-color);
    color: var(--text-primary);
}

/* 智能生成区域 */
.smart-generate-section {
    display: flex;
    gap: 8px;
    align-items: center;
}

.plan-mode-select {
    padding: 8px 12px;
    border: 1px solid var(--border-light);
    border-radius: var(--border-radius);
    font-size: 0.875rem;
    background: var(--card-bg);
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.2s ease;
    min-width: 130px;
}

.plan-mode-select:hover {
    border-color: var(--primary-color);
}

.plan-mode-select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(74, 144, 164, 0.1);
}

.plan-mode-select option {
    background: var(--card-bg);
    color: var(--text-primary);
    padding: 8px;
}

.btn-sm {
    padding: 8px 16px;
    font-size: 0.875rem;
}

.weekly-plan-content {
    flex: 1;
    overflow-y: auto;
    padding: 24px;
}

/* 计划概览统计 */
.plan-overview {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    margin-bottom: 24px;
}

.plan-stat {
    background: var(--card-bg);
    -webkit-backdrop-filter: blur(20px);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-light);
    border-radius: var(--border-radius);
    padding: 20px;
    text-align: center;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.plan-stat::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-main);
}

.plan-stat:nth-child(2)::before {
    background: var(--gradient-success);
}

.plan-stat:nth-child(3)::before {
    background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
}

.plan-stat:nth-child(4)::before {
    background: var(--gradient-accent);
}

.plan-stat:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.plan-stat-value {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    background: var(--gradient-main);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 4px;
}

.plan-stat:nth-child(2) .plan-stat-value {
    background: var(--gradient-success);
    -webkit-background-clip: text;
    background-clip: text;
}

.plan-stat:nth-child(3) .plan-stat-value {
    background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
    -webkit-background-clip: text;
    background-clip: text;
}

.plan-stat:nth-child(4) .plan-stat-value {
    background: var(--gradient-accent);
    -webkit-background-clip: text;
    background-clip: text;
}

.plan-stat-label {
    font-size: 0.8125rem;
    color: var(--text-secondary);
}

/* 一周表格容器 */
.weekly-table-container {
    background: var(--card-bg);
    -webkit-backdrop-filter: blur(20px);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-light);
    border-radius: var(--border-radius);
    overflow: hidden;
    margin-bottom: 24px;
    box-shadow: var(--shadow);
}

.weekly-table {
    width: 100%;
    border-collapse: collapse;
    table-layout: fixed;
}

.weekly-table th,
.weekly-table td {
    padding: 12px 8px;
    text-align: center;
    border: 1px solid var(--border-color);
    vertical-align: top;
}

.day-header {
    background: var(--gradient-main);
    color: white;
    font-weight: 600;
    font-size: 0.875rem;
    padding: 14px 8px;
}

.day-header.weekend {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
}

.day-header.today {
    position: relative;
}

.day-header.today::after {
    content: '今天';
    position: absolute;
    top: -8px;
    right: 4px;
    background: var(--secondary-color);
    color: #000;
    font-size: 0.625rem;
    padding: 2px 6px;
    border-radius: 8px;
    font-weight: 600;
}

/* 任务单元格 */
.weekly-table td {
    min-height: 100px;
    background: var(--bg-color);
}

.weekly-table td:hover {
    background: var(--card-bg-hover);
}

/* 计划任务项 */
.plan-task-item {
    padding: 10px 12px;
    margin: 6px 4px;
    background: var(--card-bg);
    border: 1px solid var(--border-light);
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    transition: var(--transition);
    text-align: left;
    position: relative;
    overflow: hidden;
}

.plan-task-item::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    background: var(--gradient-main);
}

.plan-task-item:hover {
    transform: translateY(-2px) scale(1.02);
    box-shadow: var(--shadow-primary);
    border-color: var(--primary-color);
}

.plan-task-item.completed {
    opacity: 0.7;
    background: rgba(16, 185, 129, 0.1);
}

.plan-task-item.completed::before {
    background: var(--gradient-success);
}

.plan-task-item.completed .task-name {
    text-decoration: line-through;
    color: var(--text-secondary);
}

.plan-task-item.weak {
    background: rgba(239, 68, 68, 0.08);
    border-color: rgba(239, 68, 68, 0.3);
}

.plan-task-item.weak::before {
    background: linear-gradient(135deg, #ef4444 0%, #f87171 100%);
}

.plan-task-item.review {
    background: rgba(245, 158, 11, 0.08);
    border-color: rgba(245, 158, 11, 0.3);
}

.plan-task-item.review::before {
    background: linear-gradient(135deg, #f59e0b 0%, #fbbf24 100%);
}

.task-icon {
    font-size: 1rem;
    margin-bottom: 4px;
}

.task-name {
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--text-primary);
    display: block;
    margin-bottom: 2px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.task-subject {
    font-size: 0.6875rem;
    color: var(--text-secondary);
}

.task-badge {
    position: absolute;
    top: 6px;
    right: 6px;
    font-size: 0.625rem;
    padding: 2px 6px;
    border-radius: 6px;
    font-weight: 600;
}

.task-badge.stars {
    background: rgba(245, 158, 11, 0.2);
    color: #d97706;
}

.task-badge.errors {
    background: rgba(239, 68, 68, 0.2);
    color: #dc2626;
}

/* 空状态单元格 */
.empty-cell {
    color: var(--text-muted);
    font-size: 0.75rem;
    padding: 20px 8px;
}

.add-task-btn {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 8px 12px;
    background: transparent;
    border: 2px dashed var(--border-color);
    border-radius: var(--border-radius-xs);
    color: var(--text-secondary);
    font-size: 0.75rem;
    cursor: pointer;
    transition: var(--transition);
    margin-top: 8px;
}

.add-task-btn:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    background: rgba(102, 126, 234, 0.05);
}

/* 今日重点区域 */
.today-focus-section,
.weak-chapters-section {
    background: var(--card-bg);
    -webkit-backdrop-filter: blur(20px);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-light);
    border-radius: var(--border-radius);
    padding: 20px 24px;
    margin-bottom: 24px;
    box-shadow: var(--shadow);
}

.today-focus-section h3,
.weak-chapters-section h3 {
    font-size: 1rem;
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border-color);
}

.today-tasks {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.today-task-card {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px 20px;
    background: var(--bg-color);
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    transition: var(--transition);
    border: 1px solid transparent;
}

.today-task-card:hover {
    transform: translateX(4px);
    border-color: var(--primary-color);
    box-shadow: var(--shadow);
}

.today-task-card .task-icon {
    font-size: 2rem;
    flex-shrink: 0;
}

.today-task-card .task-info {
    flex: 1;
    min-width: 0;
}

.today-task-card .task-title {
    font-weight: 600;
    font-size: 0.9375rem;
    margin-bottom: 4px;
}

.today-task-card .task-desc {
    font-size: 0.8125rem;
    color: var(--text-secondary);
}

.today-task-card .task-action {
    padding: 8px 16px;
    background: var(--gradient-main);
    color: white;
    border: none;
    border-radius: var(--border-radius-xs);
    font-size: 0.8125rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
}

.today-task-card .task-action:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-primary);
}

/* 薄弱章节网格 */
.weak-chapters-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 12px;
}

.weak-chapter-card {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 16px;
    background: rgba(239, 68, 68, 0.05);
    border: 1px solid rgba(239, 68, 68, 0.2);
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    transition: var(--transition);
}

.weak-chapter-card:hover {
    transform: translateY(-2px);
    border-color: var(--danger-color);
    box-shadow: 0 4px 12px rgba(239, 68, 68, 0.15);
}

.weak-chapter-card .chapter-icon {
    font-size: 1.5rem;
}

.weak-chapter-card .chapter-info {
    flex: 1;
    min-width: 0;
}

.weak-chapter-card .chapter-name {
    font-weight: 500;
    font-size: 0.875rem;
    margin-bottom: 2px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.weak-chapter-card .chapter-errors {
    font-size: 0.75rem;
    color: var(--danger-color);
}

.weak-chapter-card .start-btn {
    padding: 6px 12px;
    background: var(--danger-color);
    color: white;
    border: none;
    border-radius: var(--border-radius-xs);
    font-size: 0.75rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.weak-chapter-card .start-btn:hover {
    transform: scale(1.05);
}

/* 周计划表格任务单元格 */
.plan-task-cell {
    display: flex;
    flex-direction: column;
    padding: 10px 8px;
    background: var(--card-bg);
    border: 1px solid var(--border-light);
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    transition: var(--transition);
    min-height: 80px;
    gap: 4px;
}

.plan-task-cell:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-primary);
    border-color: var(--primary-color);
}

.plan-task-cell.completed {
    opacity: 0.7;
    background: rgba(16, 185, 129, 0.1);
    border-color: var(--success-color);
}

.plan-task-cell.weakness {
    background: rgba(239, 68, 68, 0.05);
    border-color: rgba(239, 68, 68, 0.3);
}

.plan-task-cell .task-subject {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-primary);
}

.plan-task-cell .task-chapter {
    font-size: 0.6875rem;
    color: var(--text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.plan-task-cell .task-badge {
    position: static;
    display: inline-block;
    font-size: 0.5625rem;
    padding: 2px 6px;
    background: rgba(239, 68, 68, 0.15);
    color: var(--danger-color);
    border-radius: 4px;
    font-weight: 500;
    margin-top: 4px;
}

.plan-task-cell .task-status {
    font-size: 0.875rem;
    margin-top: auto;
    text-align: center;
}

.today-cell {
    background: rgba(102, 126, 234, 0.08);
}

/* 今日任务列表项 */
.today-task {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    background: var(--bg-color);
    border: 1px solid var(--border-light);
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    transition: var(--transition);
}

.today-task:hover {
    transform: translateX(4px);
    border-color: var(--primary-color);
    box-shadow: var(--shadow);
}

.today-task.completed {
    opacity: 0.7;
    background: rgba(16, 185, 129, 0.08);
}

.today-task .today-task-status {
    font-size: 1.25rem;
}

.today-task .today-task-subject {
    font-weight: 500;
    font-size: 0.875rem;
}

.today-task .today-task-chapter {
    flex: 1;
    font-size: 0.8125rem;
    color: var(--text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.today-task .today-task-badge {
    font-size: 0.6875rem;
    padding: 2px 8px;
    background: rgba(239, 68, 68, 0.15);
    color: var(--danger-color);
    border-radius: 4px;
    font-weight: 500;
}

/* 薄弱章节卡片样式补充 */
.weak-chapter-icon {
    font-size: 1.5rem;
}

.weak-chapter-info {
    flex: 1;
    min-width: 0;
}

.weak-chapter-name {
    font-weight: 500;
    font-size: 0.875rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    display: block;
}

.weak-chapter-errors {
    font-size: 0.75rem;
    color: var(--danger-color);
}

/* 响应式适配 */
@media (max-width: 1024px) {
    .plan-overview {
        grid-template-columns: repeat(2, 1fr);
    }

    .weekly-table-container {
        overflow-x: auto;
    }

    .weekly-table {
        min-width: 700px;
    }
}

@media (max-width: 768px) {
    .weekly-plan-header {
        flex-direction: column;
        gap: 12px;
        align-items: flex-start;
    }

    .weekly-plan-actions {
        width: 100%;
        justify-content: space-between;
        flex-wrap: wrap;
        gap: 8px;
    }

    .smart-generate-section {
        flex: 1;
        min-width: 200px;
    }

    .plan-mode-select {
        flex: 1;
        min-width: 100px;
        font-size: 0.8rem;
        padding: 6px 8px;
    }

    .plan-overview {
        grid-template-columns: repeat(2, 1fr);
        gap: 12px;
    }

    .plan-stat {
        padding: 16px;
    }

    .plan-stat-value {
        font-size: 1.5rem;
    }

    .weak-chapters-grid {
        grid-template-columns: 1fr;
    }

    .today-task-card {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
    }

    .today-task-card .task-action {
        width: 100%;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .weekly-plan-content {
        padding: 16px;
    }

    .plan-overview {
        grid-template-columns: 1fr 1fr;
    }
}

/* ===== 桌面端滚动优化 ===== */
/* 确保桌面端(大于768px)欢迎页面和选择提示页面也能正常滚动 */
@media (min-width: 769px) {
    .welcome-page,
    .select-prompt {
        /* 确保有明确的高度限制 */
        max-height: calc(100vh - 0px); /* 桌面端无顶部导航 */
        overflow-y: auto;
        overflow-x: hidden;
        
    }

    .welcome-content,
    .prompt-content {
        /* 确保内容可以完整显示 */
        min-height: 0;
        padding-bottom: 40px; /* 底部留白 */
    }
}

/* ===== Mermaid 图表样式（增强版） ===== */
.mermaid-container {
    margin: 16px 0;
    text-align: center;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 20px;
    transition: var(--theme-transition);
    position: relative;
    overflow: auto;
}

/* 不同图表类型的样式 */
.mermaid-container.mermaid-mindmap {
    /* Mindmap 专用设计变量（亮色） */
    --mm-bg: linear-gradient(135deg, rgba(99, 102, 241, 0.08) 0%, rgba(168, 85, 247, 0.08) 100%);
    --mm-border: rgba(99, 102, 241, 0.28);
    --mm-node-bg: rgba(255, 255, 255, 0.92);
    --mm-node-border: rgba(99, 102, 241, 0.55);
    --mm-node-text: var(--text-primary);
    --mm-link: rgba(79, 70, 229, 0.55);
    --mm-root-bg: rgba(99, 102, 241, 0.10);
    --mm-root-border: rgba(99, 102, 241, 0.9);
    --mm-shadow: rgba(15, 23, 42, 0.10);

    background: var(--mm-bg);
    border-color: var(--mm-border);
    box-shadow: 0 10px 30px rgba(15, 23, 42, 0.06);
    border-radius: 14px;
    padding: 22px;
}

/* ===== 启动恢复遮罩（避免刷新闪回欢迎页） ===== */
.boot-splash {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 9999;
    background: radial-gradient(1200px 800px at 20% 20%, rgba(99, 102, 241, 0.18), transparent 55%),
                radial-gradient(900px 700px at 80% 30%, rgba(168, 85, 247, 0.16), transparent 50%),
                rgba(248, 250, 252, 0.92);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    align-items: center;
    justify-content: center;
}

.boot-splash-card {
    width: min(420px, calc(100vw - 48px));
    border-radius: 16px;
    padding: 22px 18px;
    background: rgba(255, 255, 255, 0.88);
    border: 1px solid rgba(99, 102, 241, 0.18);
    box-shadow: 0 24px 60px rgba(15, 23, 42, 0.16);
    text-align: center;
}

.boot-splash-logo {
    display: flex;
    justify-content: center;
    margin-bottom: 10px;
}

.boot-splash-logo .brand-logo {
    width: 46px;
    height: 46px;
}

.boot-splash-title {
    font-family: var(--font-title);
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: 0.3px;
    margin-bottom: 6px;
}

.boot-splash-subtitle {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.5;
}

html[data-boot="restoring"] #welcomePage {
    display: none !important;
}

html[data-boot="restoring"] .boot-splash {
    display: flex;
}

[data-theme="dark"] .boot-splash {
    background: radial-gradient(1200px 800px at 20% 20%, rgba(56, 189, 248, 0.12), transparent 55%),
                radial-gradient(900px 700px at 80% 30%, rgba(168, 85, 247, 0.10), transparent 50%),
                rgba(2, 6, 23, 0.90);
}

[data-theme="dark"] .boot-splash-card {
    background: rgba(15, 23, 42, 0.78);
    border-color: rgba(148, 163, 184, 0.16);
    box-shadow: 0 24px 60px rgba(0, 0, 0, 0.45);
}

.mermaid-container.mermaid-flowchart {
    background: linear-gradient(135deg, rgba(240, 147, 251, 0.08) 0%, rgba(245, 87, 108, 0.08) 100%);
    border-color: rgba(240, 147, 251, 0.3);
}

.mermaid-container.mermaid-sequence {
    background: linear-gradient(135deg, rgba(129, 207, 224, 0.08) 0%, rgba(52, 167, 255, 0.08) 100%);
    border-color: rgba(129, 207, 224, 0.3);
}

.mermaid-diagram {
    display: block;
    width: 100%;
    max-width: 100%;
    min-height: 150px;
    position: relative;
}

.mermaid-diagram svg {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 0 auto;
}

/* 加载动画 */
.mermaid-loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 150px;
    color: var(--text-secondary);
}

.loading-spinner {
    font-size: 32px;
    animation: spin 1s linear infinite;
    margin-bottom: 12px;
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.loading-text {
    font-size: 14px;
    color: var(--text-secondary);
}

/* 成功渲染动画 */
.mermaid-rendered svg {
    animation: fadeIn 0.5s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.mermaid-error {
    color: var(--danger-color);
    font-size: 14px;
    text-align: center;
    padding: 20px;
    background: rgba(255, 107, 157, 0.1);
    border-radius: 8px;
}

/* 错误容器样式 */
.mermaid-error-container {
    padding: 20px;
    background: rgba(244, 67, 54, 0.08);
    border: 2px solid rgba(244, 67, 54, 0.3);
    border-radius: 8px;
    color: var(--text-primary);
    text-align: left;
}

.mermaid-error-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
    font-size: 16px;
    font-weight: 600;
}

.error-icon {
    font-size: 24px;
}

.error-title {
    color: var(--danger-color);
}

.mermaid-error-details {
    margin-top: 12px;
}

.error-type {
    color: var(--danger-color);
    font-weight: 500;
    margin: 8px 0;
    font-size: 14px;
}

.error-suggestion {
    color: var(--text-secondary);
    margin: 12px 0;
    font-size: 14px;
    line-height: 1.5;
}

.error-help, .error-original {
    margin-top: 16px;
}

.error-help summary, .error-original summary {
    cursor: pointer;
    color: var(--primary-color);
    font-weight: 500;
    padding: 8px 12px;
    background: var(--bg-primary);
    border-radius: 4px;
    margin-bottom: 8px;
    -webkit-user-select: none;
    user-select: none;
    transition: background 0.2s;
}

.error-help summary:hover, .error-original summary:hover {
    background: var(--hover-bg, rgba(0, 0, 0, 0.05));
}

.example-code, .original-code {
    background: var(--code-bg, #f5f5f5);
    color: var(--code-color, #333);
    padding: 16px;
    border-radius: 4px;
    font-family: 'Courier New', monospace;
    font-size: 13px;
    overflow-x: auto;
    white-space: pre;
    line-height: 1.4;
    margin: 0;
}

.retry-btn {
    margin-top: 16px;
    padding: 8px 20px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.2s;
}

.retry-btn:hover {
    background: var(--primary-hover, #4338ca);
    transform: translateY(-1px);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

/* 针对 Mermaid 内置元素的样式调整 */
.mermaid text, .mermaid-rendered text {
    font-family: var(--font-sans) !important;
    fill: var(--text-primary) !important;
}

.mermaid .node rect,
.mermaid .node circle,
.mermaid .node ellipse,
.mermaid .node polygon {
    fill: var(--card-bg);
    stroke: var(--primary-color);
    stroke-width: 2px;
}

.mermaid .node .label {
    color: var(--text-primary);
}

.mermaid .edgePath .path {
    stroke: var(--primary-color);
    stroke-width: 2px;
}

.mermaid .arrowheadPath {
    fill: var(--primary-color);
}

/* 暗色主题下的 Mermaid 样式 */
[data-theme="dark"] .mermaid-container {
    background: var(--card-bg);
    border-color: var(--border-color);
}

[data-theme="dark"] .mermaid-container.mermaid-mindmap {
    /* Mindmap 专用设计变量（暗色） */
    --mm-bg: linear-gradient(135deg, rgba(56, 189, 248, 0.10) 0%, rgba(168, 85, 247, 0.10) 100%);
    --mm-border: rgba(148, 163, 184, 0.16);
    --mm-node-bg: rgba(15, 23, 42, 0.88);
    --mm-node-border: rgba(56, 189, 248, 0.55);
    --mm-node-text: rgba(226, 232, 240, 0.95);
    --mm-link: rgba(56, 189, 248, 0.45);
    --mm-root-bg: rgba(245, 158, 11, 0.10);
    --mm-root-border: rgba(245, 158, 11, 0.9);
    --mm-shadow: rgba(0, 0, 0, 0.45);

    background: var(--mm-bg);
    border-color: var(--mm-border);
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.20);
}

[data-theme="dark"] .mermaid-container.mermaid-flowchart {
    background: linear-gradient(135deg, rgba(35, 37, 38, 0.15) 0%, rgba(65, 67, 69, 0.15) 100%);
    border-color: rgba(35, 37, 38, 0.4);
}

[data-theme="dark"] .mermaid-error-container {
    background: rgba(244, 67, 54, 0.1);
    border-color: rgba(244, 67, 54, 0.4);
}

[data-theme="dark"] .example-code,
[data-theme="dark"] .original-code {
    background: var(--code-bg, #1e1e1e);
    color: var(--code-color, #d4d4d4);
}

[data-theme="dark"] .mermaid .node rect,
[data-theme="dark"] .mermaid .node circle,
[data-theme="dark"] .mermaid .node ellipse,
[data-theme="dark"] .mermaid .node polygon,
[data-theme="dark"] .mermaid-rendered .node rect,
[data-theme="dark"] .mermaid-rendered .node circle,
[data-theme="dark"] .mermaid-rendered .node ellipse,
[data-theme="dark"] .mermaid-rendered .node polygon {
    fill: var(--sidebar-bg);
    stroke: var(--accent-color);
}

[data-theme="dark"] .mermaid .node .label,
[data-theme="dark"] .mermaid-rendered .node .label {
    color: var(--sidebar-text);
    fill: var(--sidebar-text);
}

[data-theme="dark"] .mermaid .edgePath .path,
[data-theme="dark"] .mermaid-rendered .edgePath .path {
    stroke: var(--accent-color);
}

[data-theme="dark"] .mermaid .arrowheadPath,
[data-theme="dark"] .mermaid-rendered .arrowheadPath {
    fill: var(--accent-color);
}

/* ===== 思维导图暗黑模式适配 ===== */
/* Mindmap 节点/连线统一样式（亮暗模式都通过变量控制） */
.mermaid-container.mermaid-mindmap .mermaid .mindmap-node > rect,
.mermaid-container.mermaid-mindmap .mermaid .mindmap-node > circle,
.mermaid-container.mermaid-mindmap .mermaid .mindmap-node > ellipse,
.mermaid-container.mermaid-mindmap .mermaid .mindmap-node > polygon,
.mermaid-container.mermaid-mindmap .mermaid .mindmap-node > path,
.mermaid-container.mermaid-mindmap .mermaid-rendered .mindmap-node > rect,
.mermaid-container.mermaid-mindmap .mermaid-rendered .mindmap-node > circle,
.mermaid-container.mermaid-mindmap .mermaid-rendered .mindmap-node > ellipse,
.mermaid-container.mermaid-mindmap .mermaid-rendered .mindmap-node > polygon,
.mermaid-container.mermaid-mindmap .mermaid-rendered .mindmap-node > path {
    fill: var(--mm-node-bg) !important;
    stroke: var(--mm-node-border) !important;
    stroke-width: 1.5px !important;
    filter: drop-shadow(0 10px 18px var(--mm-shadow));
}

.mermaid-container.mermaid-mindmap .mermaid .mindmap-node > rect,
.mermaid-container.mermaid-mindmap .mermaid-rendered .mindmap-node > rect {
    rx: 12px !important;
    ry: 12px !important;
}

/* Mermaid mindmap 在不同版本下的 SVG class 可能是 `.node` 而不是 `.mindmap-node`，这里做一层兜底覆盖 */
.mermaid-container.mermaid-mindmap svg .node rect,
.mermaid-container.mermaid-mindmap svg .node circle,
.mermaid-container.mermaid-mindmap svg .node ellipse,
.mermaid-container.mermaid-mindmap svg .node polygon,
.mermaid-container.mermaid-mindmap svg .node path {
    fill: var(--mm-node-bg) !important;
    stroke: var(--mm-node-border) !important;
    stroke-width: 1.5px !important;
    rx: 12px !important;
    ry: 12px !important;
    filter: drop-shadow(0 10px 18px var(--mm-shadow));
}

/* 根节点（第一层）- 使用渐变边框效果 */
.mermaid-container.mermaid-mindmap .mermaid .mindmap-node.section-root > rect,
.mermaid-container.mermaid-mindmap .mermaid .mindmap-node.section-root > circle,
.mermaid-container.mermaid-mindmap .mermaid .mindmap-node.section-root > path,
.mermaid-container.mermaid-mindmap .mermaid-rendered .mindmap-node.section-root > rect,
.mermaid-container.mermaid-mindmap .mermaid-rendered .mindmap-node.section-root > circle,
.mermaid-container.mermaid-mindmap .mermaid-rendered .mindmap-node.section-root > path {
    fill: var(--mm-root-bg) !important;
    stroke: var(--mm-root-border) !important;
    stroke-width: 2.5px !important;
}

/* 根节点兜底（部分版本使用 `.root` / `.section` / `.node.root`） */
.mermaid-container.mermaid-mindmap svg .node.root rect,
.mermaid-container.mermaid-mindmap svg .node.section-root rect,
.mermaid-container.mermaid-mindmap svg g.root rect,
.mermaid-container.mermaid-mindmap svg g.section-root rect {
    fill: var(--mm-root-bg) !important;
    stroke: var(--mm-root-border) !important;
    stroke-width: 2.5px !important;
}

/* 思维导图节点文字 - 确保可读性 */
.mermaid-container.mermaid-mindmap .mermaid .mindmap-node text,
.mermaid-container.mermaid-mindmap .mermaid .mindmap-node .nodeLabel,
.mermaid-container.mermaid-mindmap .mermaid-rendered .mindmap-node text,
.mermaid-container.mermaid-mindmap .mermaid-rendered .mindmap-node .nodeLabel {
    fill: var(--mm-node-text) !important;
    color: var(--mm-node-text) !important;
    font-weight: 600 !important;
    letter-spacing: 0.2px;
}

.mermaid-container.mermaid-mindmap svg text,
.mermaid-container.mermaid-mindmap svg .nodeLabel {
    fill: var(--mm-node-text) !important;
    font-family: var(--font-sans) !important;
    font-size: 13px !important;
}

.mermaid-container.mermaid-mindmap svg .node.root text,
.mermaid-container.mermaid-mindmap svg .node.section-root text,
.mermaid-container.mermaid-mindmap svg g.root text,
.mermaid-container.mermaid-mindmap svg g.section-root text {
    font-size: 14px !important;
    font-weight: 700 !important;
}

/* 思维导图连接线 */
.mermaid-container.mermaid-mindmap .mermaid .mindmap-link,
.mermaid-container.mermaid-mindmap .mermaid .edge-path,
.mermaid-container.mermaid-mindmap .mermaid-rendered .mindmap-link,
.mermaid-container.mermaid-mindmap .mermaid-rendered .edge-path {
    stroke: var(--mm-link) !important;
    stroke-width: 1.5px !important;
    opacity: 0.95;
}

.mermaid-container.mermaid-mindmap svg .edgePath .path,
.mermaid-container.mermaid-mindmap svg path.edge-path,
.mermaid-container.mermaid-mindmap svg .mindmap-link {
    stroke: var(--mm-link) !important;
    stroke-width: 1.6px !important;
    stroke-linecap: round !important;
    stroke-linejoin: round !important;
}

/* 思维导图 section 样式 */
[data-theme="dark"] .mermaid .section rect,
[data-theme="dark"] .mermaid-rendered .section rect {
    fill: hsla(220, 50%, 18%, 0.8) !important;
    stroke: var(--border-light) !important;
}

[data-theme="dark"] .mermaid .section text,
[data-theme="dark"] .mermaid-rendered .section text {
    fill: var(--color-support) !important;
}

/* ===== Mermaid SVG 通用暗黑模式覆盖 ===== */
/* 确保所有 Mermaid SVG 元素在暗黑模式下正确显示 */
[data-theme="dark"] .mermaid svg rect[fill="#FFFFDE"],
[data-theme="dark"] .mermaid svg rect[fill="#ffffde"],
[data-theme="dark"] .mermaid svg rect[fill="yellow"],
[data-theme="dark"] .mermaid svg rect[fill="#ffd"],
[data-theme="dark"] .mermaid svg rect[fill="#FFD"],
[data-theme="dark"] .mermaid-rendered svg rect[fill="#FFFFDE"],
[data-theme="dark"] .mermaid-rendered svg rect[fill="#ffffde"],
[data-theme="dark"] .mermaid-rendered svg rect[fill="yellow"],
[data-theme="dark"] .mermaid-rendered svg rect[fill="#ffd"],
[data-theme="dark"] .mermaid-rendered svg rect[fill="#FFD"] {
    fill: hsla(220, 70%, 20%, 0.9) !important;
}

/* 覆盖所有亮色系背景 */
[data-theme="dark"] .mermaid svg rect[fill^="#FF"],
[data-theme="dark"] .mermaid svg rect[fill^="#ff"],
[data-theme="dark"] .mermaid svg rect[fill^="#EE"],
[data-theme="dark"] .mermaid svg rect[fill^="#ee"],
[data-theme="dark"] .mermaid svg path[fill^="#FF"],
[data-theme="dark"] .mermaid svg path[fill^="#ff"],
[data-theme="dark"] .mermaid-rendered svg rect[fill^="#FF"],
[data-theme="dark"] .mermaid-rendered svg rect[fill^="#ff"],
[data-theme="dark"] .mermaid-rendered svg rect[fill^="#EE"],
[data-theme="dark"] .mermaid-rendered svg rect[fill^="#ee"],
[data-theme="dark"] .mermaid-rendered svg path[fill^="#FF"],
[data-theme="dark"] .mermaid-rendered svg path[fill^="#ff"] {
    fill: hsla(220, 60%, 22%, 0.95) !important;
}

/* 所有 SVG text 元素确保可读 */
[data-theme="dark"] .mermaid svg text,
[data-theme="dark"] .mermaid-rendered svg text {
    fill: var(--color-support) !important;
}

/* 思维导图特定的 g 元素内的形状（与 mindmap 容器变量保持一致，避免覆盖掉更精细的节点样式） */
[data-theme="dark"] .mermaid-container.mermaid-mindmap .mermaid svg g[class*="mindmap"] rect,
[data-theme="dark"] .mermaid-container.mermaid-mindmap .mermaid svg g[class*="mindmap"] circle,
[data-theme="dark"] .mermaid-container.mermaid-mindmap .mermaid svg g[class*="mindmap"] ellipse,
[data-theme="dark"] .mermaid-container.mermaid-mindmap .mermaid svg g[class*="mindmap"] path,
[data-theme="dark"] .mermaid-container.mermaid-mindmap .mermaid-rendered svg g[class*="mindmap"] rect,
[data-theme="dark"] .mermaid-container.mermaid-mindmap .mermaid-rendered svg g[class*="mindmap"] circle,
[data-theme="dark"] .mermaid-container.mermaid-mindmap .mermaid-rendered svg g[class*="mindmap"] ellipse,
[data-theme="dark"] .mermaid-container.mermaid-mindmap .mermaid-rendered svg g[class*="mindmap"] path {
    fill: var(--mm-node-bg) !important;
    stroke: var(--mm-node-border) !important;
}

/* 根节点特殊样式 */
[data-theme="dark"] .mermaid-container.mermaid-mindmap .mermaid svg g[class*="mindmap"] > g:first-child rect,
[data-theme="dark"] .mermaid-container.mermaid-mindmap .mermaid svg g[class*="mindmap"] > g:first-child circle,
[data-theme="dark"] .mermaid-container.mermaid-mindmap .mermaid svg g[class*="mindmap"] > g:first-child path,
[data-theme="dark"] .mermaid-container.mermaid-mindmap .mermaid-rendered svg g[class*="mindmap"] > g:first-child rect,
[data-theme="dark"] .mermaid-container.mermaid-mindmap .mermaid-rendered svg g[class*="mindmap"] > g:first-child circle,
[data-theme="dark"] .mermaid-container.mermaid-mindmap .mermaid-rendered svg g[class*="mindmap"] > g:first-child path {
    fill: var(--mm-root-bg) !important;
    stroke: var(--mm-root-border) !important;
    stroke-width: 2.5px !important;
}

/* 移动端 Mermaid 优化 */
@media (max-width: 768px) {
    .mermaid-container {
        margin: 12px 0;
        padding: 12px;
        border-radius: 6px;
        overflow-x: auto;
        
    }

    .mermaid-diagram {
        font-size: 12px;
        min-height: 120px;
        overflow-x: auto;
    }

    .mermaid-diagram svg {
        min-width: 100%;
    }

    .mermaid-error-container {
        padding: 12px;
        font-size: 13px;
    }

    .error-help summary, .error-original summary {
        font-size: 13px;
        padding: 6px 10px;
    }

    .example-code, .original-code {
        font-size: 11px;
        padding: 10px;
    }

    .retry-btn {
        padding: 6px 14px;
        font-size: 13px;
    }

    .loading-spinner {
        font-size: 24px;
    }

    .loading-text {
        font-size: 12px;
    }
}

/* ============================================
   周计划面板样式
   ============================================ */

.weekly-plan-panel {
    padding: 20px;
    background: var(--bg-color);
    color: var(--text-primary);
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    transition: var(--theme-transition);
}

.weekly-plan-panel h2 {
    color: var(--text-primary);
    margin: 0;
    font-size: 1.25rem;
}

.weekly-plan-panel h3 {
    color: var(--text-primary);
    font-size: 1rem;
    margin-bottom: 12px;
}

.weekly-plan-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    flex-wrap: wrap;
    gap: 12px;
}

.weekly-plan-actions {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}

.smart-generate-section {
    display: flex;
    align-items: center;
    gap: 8px;
}

.plan-mode-select {
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-xs);
    background: var(--card-bg);
    color: var(--text-primary);
    font-size: 14px;
    cursor: pointer;
    transition: var(--transition-fast);
}

.plan-mode-select:hover {
    border-color: var(--primary-color);
}

.plan-mode-select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.2);
}

.plan-mode-select option {
    background: var(--card-bg);
    color: var(--text-primary);
}

/* 计划概览 */
.plan-overview {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    margin-bottom: 24px;
}

.plan-stat {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    padding: 16px;
    text-align: center;
    transition: var(--theme-transition);
}

.plan-stat-value {
    display: block;
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 4px;
}

.plan-stat-label {
    font-size: 0.8125rem;
    color: var(--text-secondary);
}

/* 周表格 */
.weekly-table-container {
    overflow-x: auto;
    margin-bottom: 24px;
    border-radius: var(--border-radius-sm);
    border: 1px solid var(--border-color);
}

.weekly-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--card-bg);
}

.weekly-table th,
.weekly-table td {
    padding: 12px;
    text-align: center;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    transition: var(--theme-transition);
}

.weekly-table th {
    background: var(--gradient-main);
    color: white;
    font-weight: 600;
    font-size: 0.875rem;
}

.weekly-table th.weekend {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
}

.weekly-table td {
    vertical-align: top;
    min-height: 100px;
    background: var(--card-bg);
}

.weekly-table tr:hover td {
    background: var(--card-bg-hover);
}

/* 今日重点 */
.today-focus-section,
.weak-chapters-section {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    padding: 16px;
    margin-bottom: 16px;
    transition: var(--theme-transition);
}

.today-tasks,
.weak-chapters-grid {
    color: var(--text-secondary);
}

.today-tasks .empty-state,
.weak-chapters-grid .empty-state {
    color: var(--text-muted);
    text-align: center;
    padding: 20px;
    font-style: italic;
}

/* 任务卡片 */
.task-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-xs);
    padding: 10px;
    margin: 6px 0;
    cursor: pointer;
    transition: var(--transition-fast);
}

.task-card:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow);
}

.task-card.weakness {
    border-left: 3px solid var(--warning-color);
}

.task-card.completed {
    opacity: 0.6;
    text-decoration: line-through;
}

.task-subject {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.task-chapter {
    font-size: 0.8125rem;
    color: var(--text-primary);
    font-weight: 500;
}

.task-badge {
    display: inline-block;
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.6875rem;
    margin-top: 4px;
}

.task-badge.weakness {
    background: rgba(255, 217, 61, 0.2);
    color: var(--warning-color);
}

/* 按钮样式 */
.btn-secondary {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 10px 16px;
    border-radius: var(--border-radius-xs);
    cursor: pointer;
    font-size: 14px;
    transition: var(--transition-fast);
}

.btn-secondary:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.btn-sm {
    padding: 8px 12px;
    font-size: 13px;
}

.btn-back {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 8px 16px;
    border-radius: var(--border-radius-xs);
    cursor: pointer;
    transition: var(--transition-fast);
}

.btn-back:hover {
    background: var(--card-bg);
    color: var(--text-primary);
}

/* 薄弱章节网格 */
.weak-chapters-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 12px;
}

.weak-chapter-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-left: 3px solid var(--danger-color);
    border-radius: var(--border-radius-xs);
    padding: 12px;
    cursor: pointer;
    transition: var(--transition-fast);
}

.weak-chapter-card:hover {
    border-color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.weak-chapter-card .subject-name {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.weak-chapter-card .chapter-name {
    font-size: 0.875rem;
    color: var(--text-primary);
    font-weight: 500;
    margin: 4px 0;
}

.weak-chapter-card .error-count {
    font-size: 0.75rem;
    color: var(--danger-color);
}

/* 移动端适配 */
@media (max-width: 768px) {
    .weekly-plan-panel {
        padding: 12px;
    }

    .weekly-plan-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .weekly-plan-actions {
        width: 100%;
        justify-content: space-between;
    }

    .plan-overview {
        grid-template-columns: repeat(2, 1fr);
        gap: 8px;
    }

    .plan-stat {
        padding: 12px;
    }

    .plan-stat-value {
        font-size: 1.25rem;
    }

    .weekly-table th,
    .weekly-table td {
        padding: 8px 4px;
        font-size: 0.75rem;
    }

    .weak-chapters-grid {
        grid-template-columns: 1fr;
    }
}

/* 全部历史面板 */
.all-history-panel {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    padding: 20px;
    background: var(--bg-color);
    color: var(--text-primary);
    transition: var(--theme-transition);
}

.all-history-panel h2 {
    color: var(--text-primary);
    margin-bottom: 16px;
}

/* 侧边栏历史列表 */
.history-panel {
    padding: 12px;
}

.history-panel h3 {
    color: var(--sidebar-text);
    font-size: 0.8125rem;
    margin-bottom: 8px;
}

.history-panel .history-item {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--sidebar-text);
}

.history-panel .history-item:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--primary-color);
}

.history-panel .history-subject,
.history-panel .history-chapter {
    color: var(--sidebar-text);
}

.history-panel .history-time {
    color: rgba(255, 255, 255, 0.5);
}

/* 全部历史面板头部和筛选 */
.all-history-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}

.all-history-header h2 {
    margin: 0;
    font-size: 1.25rem;
}

.all-history-filters {
    display: flex;
    gap: 12px;
    margin-bottom: 16px;
}

.all-history-filters select {
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-xs);
    background: var(--card-bg);
    color: var(--text-primary);
    font-size: 14px;
    cursor: pointer;
    transition: var(--transition-fast);
}

.all-history-filters select:hover {
    border-color: var(--primary-color);
}

.all-history-filters select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.2);
}

.all-history-list {
    min-height: 200px;
}

.all-history-pagination {
    text-align: center;
    margin-top: 16px;
}

/* ============================================
   错题本面板 (主内容区)
   ============================================ */

.wrong-book-panel {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    padding: 20px;
    background: var(--bg-color);
    color: var(--text-primary);
    transition: var(--theme-transition);
}

.wrong-book-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.wrong-book-header h2 {
    margin: 0;
    font-size: 1.25rem;
    color: var(--text-primary);
}

.wrong-book-content {
    max-width: 800px;
}

.wrong-book-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    margin-bottom: 20px;
}

.wrong-stat-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    padding: 16px;
    text-align: center;
    transition: var(--transition-fast);
}

.wrong-stat-card:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow);
}

.wrong-stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    display: block;
}

.wrong-stat-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-top: 4px;
    display: block;
}

.wrong-book-panel .wrong-filter {
    display: flex;
    gap: 12px;
    margin-bottom: 16px;
}

.wrong-book-panel .wrong-filter select {
    flex: 1;
    padding: 10px 14px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-xs);
    background: var(--card-bg);
    color: var(--text-primary);
    font-size: 14px;
    cursor: pointer;
    transition: var(--transition-fast);
}

.wrong-book-panel .wrong-filter select:hover {
    border-color: var(--primary-color);
}

.wrong-book-panel .wrong-filter select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.2);
}

.wrong-list-container {
    min-height: 200px;
    max-height: 400px;
    overflow-y: auto;
}

.wrong-book-panel #wrongList {
    list-style: none;
    padding: 0;
    margin: 0;
}

.wrong-book-panel #wrongList li.wrong-item {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    padding: 14px 16px;
    margin-bottom: 10px;
    cursor: pointer;
    transition: var(--transition-fast);
}

.wrong-book-panel #wrongList li.wrong-item:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow);
    transform: translateY(-2px);
}

.wrong-book-panel #wrongList li.wrong-item.reviewed {
    opacity: 0.7;
    background: rgba(16, 185, 129, 0.05);
    border-color: var(--success-color);
}

.wrong-item-header {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 8px;
    flex-wrap: wrap;
}

.wrong-book-panel #wrongList .wrong-subject {
    font-size: 0.8125rem;
    color: var(--text-primary);
    font-weight: 500;
}

.wrong-book-panel #wrongList .wrong-difficulty {
    font-size: 0.6875rem;
    padding: 2px 8px;
    border-radius: 4px;
    font-weight: 500;
}

.wrong-difficulty.basic {
    background: rgba(16, 185, 129, 0.15);
    color: var(--success-color);
}

.wrong-difficulty.medium {
    background: rgba(245, 158, 11, 0.15);
    color: #d97706;
}

.wrong-difficulty.hard {
    background: rgba(239, 68, 68, 0.15);
    color: var(--danger-color);
}

.wrong-book-panel #wrongList .wrong-status {
    font-size: 0.6875rem;
    color: var(--success-color);
    margin-left: auto;
}

.wrong-book-panel #wrongList .wrong-preview {
    font-size: 0.8125rem;
    color: var(--text-secondary);
    line-height: 1.5;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* 错题详情页头部 */
.wrong-detail-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border-color);
}

.wrong-detail-header h3 {
    margin: 0;
    font-size: 1.125rem;
}

.wrong-detail-header .btn-back {
    padding: 6px 12px;
    font-size: 0.875rem;
}

.wrong-empty {
    text-align: center;
    padding: 40px 20px;
    color: var(--text-muted);
    font-size: 0.875rem;
}

/* ============================================
   个人中心面板
   ============================================ */

.profile-panel {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    padding: 20px;
    background: var(--bg-color);
    color: var(--text-primary);
    transition: var(--theme-transition);
}

.profile-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.profile-header h2 {
    margin: 0;
    font-size: 1.25rem;
    color: var(--text-primary);
}

.profile-content {
    max-width: 600px;
}

.profile-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 24px;
    margin-bottom: 20px;
    text-align: center;
}

.profile-avatar {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: var(--gradient-main);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    margin: 0 auto 16px;
}

.profile-name {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.profile-class {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 16px;
}

.profile-stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    padding-top: 16px;
    border-top: 1px solid var(--border-color);
}

.profile-stat {
    text-align: center;
}

.profile-stat-value {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary-color);
    display: block;
}

.profile-stat-label {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.profile-actions {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.profile-action-btn {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    transition: var(--transition-fast);
    text-align: left;
    width: 100%;
}

.profile-action-btn:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow);
}

.profile-action-icon {
    width: 40px;
    height: 40px;
    border-radius: 10px;
    background: var(--gradient-main);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
}

.profile-action-text {
    flex: 1;
}

.profile-action-title {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-primary);
    display: block;
}

.profile-action-desc {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.profile-action-arrow {
    color: var(--text-muted);
    font-size: 1rem;
}

.profile-logout-btn {
    margin-top: 20px;
    padding: 14px;
    width: 100%;
    background: transparent;
    border: 2px solid var(--danger-color);
    border-radius: var(--border-radius-sm);
    color: var(--danger-color);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-fast);
}

.profile-logout-btn:hover {
    background: var(--danger-color);
    color: white;
}

/* 移动端适配 - 错题本和个人中心 */
@media (max-width: 768px) {
    .wrong-book-panel,
    .profile-panel {
        padding: 12px;
        padding-bottom: 80px;
    }

    .wrong-book-stats {
        grid-template-columns: repeat(3, 1fr);
        gap: 8px;
    }

    .wrong-stat-card {
        padding: 12px 8px;
    }

    .wrong-stat-value {
        font-size: 1.25rem;
    }

    .wrong-stat-label {
        font-size: 0.6875rem;
    }

    .wrong-book-panel .wrong-filter {
        flex-direction: column;
        gap: 8px;
    }

    .profile-stats-grid {
        gap: 8px;
    }

    .profile-stat-value {
        font-size: 1rem;
    }
}

/* ============================================
   全局加载遮罩
   ============================================ */

.global-loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: none;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    z-index: 9999;
}

.global-loading-overlay.active {
    display: flex;
}

.global-loading-overlay .loading-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

.global-loading-overlay .loading-text {
    color: white;
    margin-top: 12px;
    font-size: 0.875rem;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ============================================
   学习建议样式
   ============================================ */

.recommendation-item {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 12px;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    margin-bottom: 8px;
    transition: var(--transition-fast);
}

.recommendation-item:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow);
}

.recommendation-item.warning {
    border-left: 3px solid var(--warning-color);
}

.recommendation-item.info {
    border-left: 3px solid var(--primary-color);
}

.recommendation-item.success {
    border-left: 3px solid var(--secondary-color);
}

.recommendation-icon {
    font-size: 1.25rem;
    flex-shrink: 0;
}

.recommendation-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.recommendation-title {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-primary);
}

.recommendation-desc {
    font-size: 0.75rem;
    color: var(--text-secondary);
    line-height: 1.4;
}

/* ============================================
   空状态提示
   ============================================ */

.empty-hint {
    text-align: center;
    padding: 24px 16px;
    color: var(--text-muted);
    font-size: 0.875rem;
}

.empty-state {
    text-align: center;
    padding: 32px 16px;
    color: var(--text-muted);
}

.empty-state .icon {
    font-size: 2rem;
    display: block;
    margin-bottom: 8px;
}

.empty-state p {
    font-size: 0.875rem;
}

/* ============================================
   科目进度样式
   ============================================ */

.subject-progress-item {
    padding: 12px;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    margin-bottom: 8px;
}

.subject-progress-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
}

.subject-progress-name {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 6px;
}

.subject-progress-name .icon {
    font-size: 1rem;
}

.subject-progress-stats {
    display: flex;
    gap: 12px;
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.progress-bar-container {
    height: 6px;
    background: var(--border-color);
    border-radius: 3px;
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    background: var(--gradient-main);
    border-radius: 3px;
    transition: width 0.3s ease;
}

/* ============================================
   图表样式
   ============================================ */

.chart-bar-item {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 8px;
}

.chart-bar-label {
    width: 60px;
    font-size: 0.75rem;
    color: var(--text-secondary);
    flex-shrink: 0;
}

.chart-bar-wrapper {
    flex: 1;
    height: 24px;
    background: var(--border-color);
    border-radius: 4px;
    overflow: hidden;
}

.chart-bar-fill {
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: flex-end;
    padding-right: 8px;
    border-radius: 4px;
    background: var(--primary-color);
    transition: width 0.3s ease;
}

.chart-bar-fill.subject-math { background: #667eea; }
.chart-bar-fill.subject-chinese { background: #f093fb; }
.chart-bar-fill.subject-english { background: #4facfe; }
.chart-bar-fill.subject-physics { background: #00f2c3; }
.chart-bar-fill.subject-default { background: var(--primary-color); }

.chart-bar-fill.difficulty-basic { background: var(--secondary-color); }
.chart-bar-fill.difficulty-medium { background: var(--warning-color); }
.chart-bar-fill.difficulty-hard { background: var(--danger-color); }

.chart-bar-value {
    font-size: 0.6875rem;
    color: white;
    font-weight: 500;
}

/* ============================================
   章节星星列表
   ============================================ */

.chapter-star-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 12px;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-xs);
    margin-bottom: 6px;
}

.chapter-star-item.completed {
    border-color: var(--secondary-color);
}

.chapter-star-name {
    font-size: 0.8125rem;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 8px;
}

.chapter-star-name .subject-tag {
    font-size: 0.6875rem;
    padding: 2px 6px;
    background: hsla(15, 100%, 55%, 0.1);
    color: var(--primary-color);
    border-radius: 4px;
}

.chapter-star-stars {
    font-size: 0.875rem;
}

/* ============================================
   入场动画系统 - 戏剧性波浪入场
   ============================================ */

/* 主入场动画 */
@keyframes revealContent {
    from {
        opacity: 0;
        transform: translateY(30px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

/* 从左滑入 */
@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* 从右滑入 */
@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* 缩放弹入 */
@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.8);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

/* 动画基础类 */
.animate-reveal {
    animation: revealContent 0.6s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
    opacity: 0;
}

.animate-slide-left {
    animation: slideInLeft 0.5s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
    opacity: 0;
}

.animate-slide-right {
    animation: slideInRight 0.5s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
    opacity: 0;
}

.animate-scale {
    animation: scaleIn 0.4s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
    opacity: 0;
}

/* 延迟类 - 用于错开动画 */
.delay-100 { animation-delay: 100ms; }
.delay-200 { animation-delay: 200ms; }
.delay-300 { animation-delay: 300ms; }
.delay-400 { animation-delay: 400ms; }
.delay-500 { animation-delay: 500ms; }

/* 欢迎页面入场动画 */
.welcome-page .welcome-content {
    animation: revealContent 0.8s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.welcome-page .login-form {
    animation: revealContent 0.6s cubic-bezier(0.34, 1.56, 0.64, 1) 0.2s backwards;
}

.welcome-page .features {
    animation: revealContent 0.6s cubic-bezier(0.34, 1.56, 0.64, 1) 0.3s backwards;
}

.welcome-page .points-rules {
    animation: revealContent 0.6s cubic-bezier(0.34, 1.56, 0.64, 1) 0.4s backwards;
}

/* 模式选择卡片入场动画 */
.mode-cards .mode-card:nth-child(1) {
    animation: revealContent 0.5s cubic-bezier(0.34, 1.56, 0.64, 1) 0.1s backwards;
}

.mode-cards .mode-card:nth-child(2) {
    animation: revealContent 0.5s cubic-bezier(0.34, 1.56, 0.64, 1) 0.15s backwards;
}

.mode-cards .mode-card:nth-child(3) {
    animation: revealContent 0.5s cubic-bezier(0.34, 1.56, 0.64, 1) 0.2s backwards;
}

.mode-cards .mode-card:nth-child(4) {
    animation: revealContent 0.5s cubic-bezier(0.34, 1.56, 0.64, 1) 0.25s backwards;
}

/* 侧边栏入场动画 */
.sidebar {
    animation: slideInLeft 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.sidebar-header {
    animation: revealContent 0.5s cubic-bezier(0.34, 1.56, 0.64, 1) 0.1s backwards;
}

.student-info {
    animation: revealContent 0.5s cubic-bezier(0.34, 1.56, 0.64, 1) 0.15s backwards;
}

.function-menu .menu-btn:nth-child(1) { animation: slideInLeft 0.4s ease 0.1s backwards; }
.function-menu .menu-btn:nth-child(2) { animation: slideInLeft 0.4s ease 0.15s backwards; }
.function-menu .menu-btn:nth-child(3) { animation: slideInLeft 0.4s ease 0.2s backwards; }
.function-menu .menu-btn:nth-child(4) { animation: slideInLeft 0.4s ease 0.25s backwards; }
.function-menu .menu-btn:nth-child(5) { animation: slideInLeft 0.4s ease 0.3s backwards; }
.function-menu .menu-btn:nth-child(6) { animation: slideInLeft 0.4s ease 0.35s backwards; }

/* 统计面板入场动画 */
.stats-dashboard .stats-header {
    animation: revealContent 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.stats-dashboard .stats-overview {
    animation: revealContent 0.5s cubic-bezier(0.34, 1.56, 0.64, 1) 0.1s backwards;
}

.stats-dashboard .stats-section {
    animation: revealContent 0.5s cubic-bezier(0.34, 1.56, 0.64, 1) 0.2s backwards;
}

/* 渐变文字效果（用于统计数值）*/
.gradient-text {
    background: var(--gradient-main);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ============================================
   历史记录分组样式（展开/折叠）
   ============================================ */

/* 覆盖 all-history-list 的 grid 布局为单列 */
.all-history-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
    padding: 16px;
}

/* 历史分组容器 */
.history-group {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    overflow: hidden;
    transition: var(--transition);
}

.history-group:hover {
    border-color: var(--border-light);
}

/* 分组头部（可点击展开） */
.history-group-header {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 14px 16px;
    cursor: pointer;
    transition: var(--transition);
    user-select: none;
}

.history-group-header:hover {
    background: var(--bg-card-hover);
}

.history-group-header::after {
    content: '▸';
    margin-left: auto;
    font-size: 0.875rem;
    color: var(--text-muted);
    transition: transform 0.3s ease;
    align-self: center; /* 确保箭头垂直居中 */
    line-height: 1; /* 防止行高影响对齐 */
}

.history-group.expanded .history-group-header::after {
    transform: rotate(90deg);
}

.history-group-header .group-icon {
    font-size: 1.25rem;
    line-height: 1;
}

.history-group-header .group-name {
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--text-primary);
    font-family: var(--font-heading);
    line-height: 1.2;
}

.history-group-header .group-count {
    font-size: 0.75rem;
    color: var(--text-muted);
    background: var(--bg-card);
    padding: 2px 8px;
    border-radius: 10px;
    line-height: 1;
}

/* 分组内容（默认折叠） */
.history-group-items {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-out;
    background: hsla(0, 0%, 0%, 0.05);
}

.history-group.expanded .history-group-items {
    max-height: 250px; /* 约5条记录的高度 */
    overflow-y: auto; /* 超过5条可滚动 */
    -webkit-overflow-scrolling: touch; /* iOS 平滑滚动 */
}

/* 历史记录滚动条样式 */
.history-group-items::-webkit-scrollbar {
    width: 4px;
}

.history-group-items::-webkit-scrollbar-track {
    background: transparent;
}

.history-group-items::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 2px;
}

/* 历史记录项 */
.history-group-items .history-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 16px;
    border-top: 1px solid var(--border-color);
    cursor: pointer;
    transition: var(--transition-fast);
}

.history-group-items .history-item:hover {
    background: var(--bg-card-hover);
}

.history-group-items .history-item:first-child {
    border-top: none;
}

.history-item .history-info {
    display: flex;
    align-items: center;
    gap: 10px;
    flex: 1;
    min-width: 0;
}

.history-item .history-chapter {
    font-size: 0.8125rem;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.history-item .history-type-badge {
    font-size: 0.625rem;
    padding: 2px 6px;
    border-radius: 4px;
    font-weight: 500;
    flex-shrink: 0;
}

.history-item .history-type-badge.learn {
    background: hsla(15, 100%, 55%, 0.15);
    color: var(--color-accent);
}

.history-item .history-type-badge.diagnosis {
    background: hsla(270, 70%, 60%, 0.15);
    color: hsl(270, 70%, 60%);
}

.history-item .history-type-badge.exam {
    background: hsla(330, 80%, 55%, 0.15);
    color: hsl(330, 80%, 55%);
}

.history-item .history-meta {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-shrink: 0;
}

.history-item .history-time {
    font-size: 0.6875rem;
    color: var(--text-muted);
}

.history-item .history-points {
    font-size: 0.75rem;
    color: var(--success);
    font-weight: 500;
}

/* 移动端适配 */
@media (max-width: 768px) {
    .all-history-list {
        padding: 12px;
    }

    .history-group-header {
        padding: 12px 14px;
    }

    .history-group-items .history-item {
        padding: 10px 14px;
        flex-wrap: wrap;
        gap: 6px;
    }

    .history-item .history-meta {
        width: 100%;
        justify-content: space-between;
        padding-top: 6px;
        border-top: 1px dashed var(--border-color);
        margin-top: 4px;
    }
}


/* ============ 积分和星星动画 ============ */

/* 积分增加动画 */
.points-animation {
    position: fixed;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--success);
    text-shadow: 0 2px 8px hsla(150, 80%, 45%, 0.4);
    pointer-events: none;
    z-index: 10000;
    transform: translateX(-50%);
    animation: pointsFloat 1.5s ease-out forwards;
}

@keyframes pointsFloat {
    0% {
        opacity: 1;
        transform: translateX(-50%) translateY(0) scale(1);
    }
    50% {
        opacity: 1;
        transform: translateX(-50%) translateY(-30px) scale(1.2);
    }
    100% {
        opacity: 0;
        transform: translateX(-50%) translateY(-60px) scale(0.8);
    }
}

/* 星星动画 */
.star-animation {
    position: fixed;
    font-size: 2rem;
    pointer-events: none;
    z-index: 10000;
    transform: translateX(-50%);
    animation: starBurst 1.8s ease-out forwards;
    text-shadow: 0 0 20px hsla(45, 100%, 55%, 0.8);
}

@keyframes starBurst {
    0% {
        opacity: 0;
        transform: translateX(-50%) translateY(0) scale(0.3) rotate(0deg);
    }
    30% {
        opacity: 1;
        transform: translateX(-50%) translateY(-20px) scale(1.5) rotate(180deg);
    }
    60% {
        opacity: 1;
        transform: translateX(-50%) translateY(-50px) scale(1.2) rotate(360deg);
    }
    100% {
        opacity: 0;
        transform: translateX(-50%) translateY(-80px) scale(0.5) rotate(540deg);
    }
}

/* Toast 容器 */
.toast-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 10001;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

/* Toast 样式 */
.toast {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 20px;
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    border-radius: 12px;
    border: 1px solid var(--border-color);
    box-shadow: 0 8px 32px hsla(0, 0%, 0%, 0.3);
    transform: translateX(120%);
    transition: transform 0.3s ease;
    max-width: 350px;
}

.toast.show {
    transform: translateX(0);
}

.toast-icon {
    font-size: 1.25rem;
    flex-shrink: 0;
}

.toast-message {
    font-size: 0.875rem;
    color: var(--text-primary);
    line-height: 1.4;
}

.toast-success {
    border-color: var(--success);
    background: linear-gradient(135deg, hsla(150, 80%, 45%, 0.15) 0%, var(--bg-card) 100%);
}

.toast-error {
    border-color: var(--danger);
    background: linear-gradient(135deg, hsla(0, 80%, 55%, 0.15) 0%, var(--bg-card) 100%);
}

.toast-warning {
    border-color: var(--warning);
    background: linear-gradient(135deg, hsla(45, 100%, 55%, 0.15) 0%, var(--bg-card) 100%);
}

.toast-info {
    border-color: var(--info);
    background: linear-gradient(135deg, hsla(200, 80%, 55%, 0.15) 0%, var(--bg-card) 100%);
}

/* 全局加载遮罩 */
.global-loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: hsla(220, 90%, 10%, 0.8);
    backdrop-filter: blur(8px);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 16px;
    z-index: 10002;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

.global-loading-overlay.active {
    opacity: 1;
    visibility: visible;
}

.loading-spinner {
    width: 48px;
    height: 48px;
    border: 4px solid var(--border-color);
    border-top-color: var(--color-accent);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.loading-text {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* 移动端 Toast 位置调整 */
@media (max-width: 768px) {
    .toast-container {
        top: auto;
        bottom: 80px;
        right: 10px;
        left: 10px;
    }

    .toast {
        max-width: 100%;
    }
}

/* 历史记录星星样式 */
.history-stars {
    font-size: 0.75rem;
    color: var(--warning);
    font-weight: 500;
}

.history-stars.is-zero {
    opacity: 0.55;
}

/* ============================================================
   多年级与特长拓展课样式
   ============================================================ */

/* 年级选择器 */
.grade-selector {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
}

.grade-selector:hover {
    border-color: var(--color-accent);
    box-shadow: var(--shadow);
}

.grade-selector-icon {
    font-size: 1.25rem;
}

.grade-selector-name {
    font-weight: 500;
    color: var(--text-primary);
}

.grade-selector-arrow {
    margin-left: auto;
    color: var(--text-secondary);
    transition: transform 0.2s;
}

.grade-selector.open .grade-selector-arrow {
    transform: rotate(180deg);
}

/* 年级下拉菜单 */
.grade-dropdown {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.2s ease;
}

.grade-dropdown.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(4px);
}

.grade-dropdown-group {
    padding: 8px 0;
    border-bottom: 1px solid var(--border-light);
}

.grade-dropdown-group:last-child {
    border-bottom: none;
}

.grade-dropdown-label {
    padding: 4px 12px;
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.grade-dropdown-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 12px;
    cursor: pointer;
    transition: background 0.15s;
}

.grade-dropdown-item:hover {
    background: var(--bg-hover);
}

.grade-dropdown-item.active {
    background: rgba(79, 70, 229, 0.1);
    color: var(--color-accent);
}

/* 科目分类区域 */
.subjects-section {
    margin-bottom: 24px;
}

.subjects-section-title {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 12px;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.subjects-section-title .section-icon {
    font-size: 1rem;
}

.subjects-section-divider {
    flex: 1;
    height: 1px;
    background: var(--border-light);
}

/* 特长拓展课卡片样式 */
.subject-card.extension {
    position: relative;
    border: 2px solid transparent;
    background: linear-gradient(var(--card-bg), var(--card-bg)) padding-box,
                linear-gradient(135deg, #FFD700, #FFA500) border-box;
}

.subject-card.extension.ai {
    background: linear-gradient(var(--card-bg), var(--card-bg)) padding-box,
                linear-gradient(135deg, #00D4FF, #0099FF) border-box;
}

.subject-card.extension::before {
    content: '';
    position: absolute;
    top: -1px;
    right: -1px;
    width: 32px;
    height: 32px;
    background: linear-gradient(135deg, #FFD700, #FFA500);
    clip-path: polygon(100% 0, 0 0, 100% 100%);
    border-radius: 0 var(--border-radius) 0 0;
}

.subject-card.extension.ai::before {
    background: linear-gradient(135deg, #00D4FF, #0099FF);
}

.subject-card.extension .subject-badge {
    position: absolute;
    top: 2px;
    right: 2px;
    font-size: 0.625rem;
    color: white;
    z-index: 1;
}

/* 特长课等级标签 */
.extension-level-badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 2px 8px;
    font-size: 0.6875rem;
    font-weight: 500;
    background: rgba(255, 215, 0, 0.15);
    color: #B8860B;
    border-radius: 10px;
    margin-top: 4px;
}

.extension-level-badge.ai {
    background: rgba(0, 212, 255, 0.15);
    color: #0099CC;
}

/* 特长课科目颜色 */
.subject-olympiad {
    --subject-color: #FFD700;
    --subject-bg: rgba(255, 215, 0, 0.1);
}

.subject-ai {
    --subject-color: #00D4FF;
    --subject-bg: rgba(0, 212, 255, 0.1);
}

/* 年级徽章 */
.grade-badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px 10px;
    font-size: 0.75rem;
    font-weight: 500;
    background: var(--bg-secondary);
    color: var(--text-secondary);
    border-radius: 12px;
}

.grade-badge.primary {
    background: rgba(34, 197, 94, 0.1);
    color: #16a34a;
}

.grade-badge.junior {
    background: rgba(79, 70, 229, 0.1);
    color: var(--color-accent);
}

.grade-badge.senior {
    background: rgba(239, 68, 68, 0.1);
    color: #dc2626;
}