/* 湘君辅导 - 样式文件 */

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

:root {
    /* === 10% 强调色 - 按钮/重点 === */
    --primary-color: #667eea;
    --primary-hover: #5a6fd6;
    --primary-light: #764ba2;
    --secondary-color: #00f2c3;
    --warning-color: #ffd93d;
    --danger-color: #ff6b9d;
    --accent-color: #4facfe;

    /* === 渐变定义 === */
    --gradient-main: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-card: linear-gradient(135deg, rgba(102, 126, 234, 0.1) 0%, rgba(118, 75, 162, 0.1) 100%);
    --gradient-accent: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --gradient-success: linear-gradient(135deg, #00f2c3 0%, #0bf 100%);

    /* === 60% 主导色 - 浅色背景 === */
    --bg-color: #f8fafc;
    --sidebar-bg: #1e293b;
    --sidebar-text: #e2e8f0;

    /* === 30% 支撑色 - 卡片/组件 === */
    --card-bg: #ffffff;
    --card-bg-hover: rgba(255, 255, 255, 0.95);

    /* 文字颜色 */
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;

    /* 边框和阴影 */
    --border-color: #e2e8f0;
    --border-light: rgba(102, 126, 234, 0.15);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.15);
    --shadow-primary: 0 8px 24px rgba(102, 126, 234, 0.3);

    /* === 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);
    --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;
}

/* 深色模式 */
[data-theme="dark"] {
    /* 60% 主导色 - 深色背景 */
    --bg-color: #0f0c29;
    --sidebar-bg: #1a1636;

    /* 30% 支撑色 */
    --card-bg: rgba(255, 255, 255, 0.05);
    --card-bg-hover: rgba(255, 255, 255, 0.08);

    /* 文字颜色 */
    --text-primary: #f1f5f9;
    --text-secondary: #b8b9ce;
    --text-muted: #6c6d83;

    /* 边框和阴影 */
    --border-color: rgba(255, 255, 255, 0.1);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.4);
}

/* 跟随系统主题 */
@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
        --bg-color: #0f0c29;
        --sidebar-bg: #1a1636;
        --card-bg: rgba(255, 255, 255, 0.05);
        --card-bg-hover: rgba(255, 255, 255, 0.08);
        --text-primary: #f1f5f9;
        --text-secondary: #b8b9ce;
        --text-muted: #6c6d83;
        --border-color: rgba(255, 255, 255, 0.1);
        --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
        --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.4);
    }
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    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;
}

/* === 多层背景光晕效果 === */
/* 浅色模式光晕 */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image:
        radial-gradient(at 20% 30%, rgba(102, 126, 234, 0.08) 0px, transparent 50%),
        radial-gradient(at 80% 70%, rgba(118, 75, 162, 0.08) 0px, transparent 50%),
        radial-gradient(at 50% 50%, rgba(79, 172, 254, 0.05) 0px, transparent 50%);
    pointer-events: none;
    z-index: -1;
}

/* 深色模式光晕 - 更强烈 */
[data-theme="dark"] body::before {
    background-image:
        radial-gradient(at 20% 30%, rgba(102, 126, 234, 0.15) 0px, transparent 50%),
        radial-gradient(at 80% 70%, rgba(118, 75, 162, 0.15) 0px, transparent 50%),
        radial-gradient(at 50% 50%, rgba(79, 172, 254, 0.1) 0px, transparent 50%);
}
@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) body::before {
        background-image:
            radial-gradient(at 20% 30%, rgba(102, 126, 234, 0.15) 0px, transparent 50%),
            radial-gradient(at 80% 70%, rgba(118, 75, 162, 0.15) 0px, transparent 50%),
            radial-gradient(at 50% 50%, rgba(79, 172, 254, 0.1) 0px, transparent 50%);
    }
}

.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;
}

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

.settings-btn {
    position: absolute;
    top: 12px;
    right: 12px;
    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;
}

.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: rgba(79, 70, 229, 0.05);
    border-radius: 12px;
    border: 1px solid rgba(79, 70, 229, 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(-2px) scale(1.01);
    border-color: rgba(102, 126, 234, 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 rgba(102, 126, 234, 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 rgba(102, 126, 234, 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: rgba(102, 126, 234, 0.3);
    box-shadow: 0 8px 32px rgba(102, 126, 234, 0.2);
}

.feature .icon {
    font-size: 1.25rem;
    filter: drop-shadow(0 4px 8px rgba(102, 126, 234, 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: center;
    justify-content: center;
    padding: 40px;
}

.wrong-detail-content {
    max-width: 600px;
    width: 100%;
    background: var(--card-bg);
    padding: 32px;
    border-radius: 16px;
    box-shadow: var(--shadow);
}

.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: 24px;
}

.wrong-item {
    display: flex;
    padding: 12px 0;
    border-bottom: 1px solid var(--border-color);
}

.wrong-item .label {
    width: 100px;
    color: var(--text-secondary);
}

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

.wrong-item .value.correct {
    color: var(--secondary-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.assistant .message-avatar {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.message.user .message-avatar {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 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;
    gap: 8px;
    padding: 8px 12px;
    background: var(--card-bg);
    border-top: 1px solid var(--border-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;
    }
}

/* 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: 34px;
    height: 34px;
    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 {
    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: 22px;
    height: 22px;
    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: 18px;
    height: 18px;
    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));
    }

    /* 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,
    .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);
}

/* 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 {
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.08) 0%, rgba(118, 75, 162, 0.08) 100%);
    border-color: rgba(102, 126, 234, 0.3);
}

.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 {
    background: linear-gradient(135deg, rgba(30, 60, 114, 0.15) 0%, rgba(42, 82, 152, 0.15) 100%);
    border-color: rgba(30, 60, 114, 0.4);
}

[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);
}

/* 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;
    }
}