/* 全局样式 */
:root {
    --primary-color: #2196F3;
    --secondary-color: #1976D2;
    --accent-color: #FF5722;
    --text-color: #333;
    --text-secondary: #666;
    --text-muted: #999;
    --light-gray: #f8f9fa;
    --border-color: #e0e0e0;
    --success-color: #4CAF50;
    --warning-color: #FFC107;
    --error-color: #F44336;
    --white: #ffffff;
    --radius: 8px;
    --radius-lg: 12px;
    --shadow: 0 2px 4px rgba(0,0,0,0.1);
    --shadow-lg: 0 4px 12px rgba(0,0,0,0.15);
    --shadow-xl: 0 8px 24px rgba(0,0,0,0.2);
    --container-width: 1200px;
    --container-padding: 20px;
    --sidebar-width: 320px;
    --transition: all 0.3s ease;
}

/* ==========================================================================
   单课程页面样式 - 现代化重构
   ========================================================================== */

/* 课程包装器 */
.cmm-single-course-wrapper {
    max-width: none;
    margin: 0;
    padding: 0;
    background: var(--light-gray);
    min-height: 100vh;
}

/* 英雄区域 */
.cmm-course-hero {
    position: relative;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    padding: 60px 0 40px;
    margin-bottom: 0;
    overflow: hidden;
}

.cmm-hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
}

.cmm-hero-image {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0.2;
}

.cmm-course-featured-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.cmm-hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.4);
}

.cmm-hero-content {
    position: relative;
    z-index: 2;
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

/* 面包屑导航 */
.cmm-breadcrumb {
    display: flex;
    align-items: center;
    margin-bottom: 20px;
    font-size: 14px;
    opacity: 0.9;
}

.cmm-breadcrumb-link {
    color: white;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: var(--transition);
}

.cmm-breadcrumb-link:hover {
    opacity: 0.8;
    text-decoration: underline;
}

.cmm-breadcrumb-separator {
    margin: 0 12px;
    opacity: 0.7;
}

.cmm-breadcrumb-category {
    opacity: 0.8;
}

/* 课程标题 */
.cmm-course-hero .cmm-course-title {
    font-size: 2.5rem;
    font-weight: 700;
    line-height: 1.2;
    margin: 0 0 20px 0;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

/* 课程摘要 */
.cmm-course-excerpt {
    font-size: 1.1rem;
    line-height: 1.6;
    margin-bottom: 40px;
    opacity: 0.95;
    max-width: 800px;
}

/* 元数据卡片 */
.cmm-course-meta-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
    margin: 20px 0 30px 0;
}

.cmm-meta-card {
    display: flex;
    align-items: center;
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius);
    padding: 15px;
    transition: var(--transition);
}

.cmm-meta-card:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

.cmm-meta-icon {
    font-size: 1.5rem;
    margin-right: 12px;
    opacity: 0.9;
}

.cmm-meta-content {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.cmm-meta-label {
    font-size: 0.85rem;
    opacity: 0.8;
    font-weight: 500;
}

.cmm-meta-value {
    font-size: 1rem;
    font-weight: 600;
}

/* 分类和标签 */
.cmm-course-taxonomy {
    margin-bottom: 30px;
}

.cmm-taxonomy-group {
    display: flex;
    align-items: center;
    margin-bottom: 12px;
    flex-wrap: wrap;
    gap: 8px;
}

.cmm-taxonomy-label {
    font-size: 0.9rem;
    font-weight: 600;
    margin-right: 8px;
    opacity: 0.9;
}

.cmm-taxonomy-terms {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.cmm-term-tag {
    display: inline-flex;
    align-items: center;
    background: rgba(255, 255, 255, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 20px;
    padding: 6px 12px;
    font-size: 0.85rem;
    gap: 6px;
    transition: var(--transition);
}

.cmm-term-tag:hover {
    background: rgba(255, 255, 255, 0.3);
}

/* 操作按钮区域 */
.cmm-course-actions {
    display: flex;
    align-items: center;
    gap: 15px;
    flex-wrap: wrap;
    margin-top: 35px;
}

.cmm-action-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    background: rgba(255, 255, 255, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.3);
    color: white;
    border-radius: var(--radius);
    padding: 10px 16px;
    font-size: 0.9rem;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
}

.cmm-action-btn:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: translateY(-1px);
}

.cmm-btn-favorite.favorited {
    background: var(--error-color);
    border-color: var(--error-color);
}

/* 学习进度 */
.cmm-progress-container {
    display: flex;
    align-items: center;
    gap: 10px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius);
    padding: 8px 12px;
    min-width: 200px;
}

.cmm-progress-label {
    font-size: 0.85rem;
    white-space: nowrap;
}

.cmm-progress-bar {
    flex: 1;
    height: 6px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 3px;
    overflow: hidden;
}

.cmm-progress-fill {
    height: 100%;
    background: var(--success-color);
    width: 0%;
    transition: width 0.3s ease;
}

.cmm-progress-text {
    font-size: 0.85rem;
    font-weight: 600;
    min-width: 30px;
}

/* 主体内容区域 */
.cmm-course-body {
    background: var(--light-gray);
    min-height: 70vh;
}

.cmm-course-container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 40px var(--container-padding);
    display: grid;
    grid-template-columns: 1fr var(--sidebar-width);
    gap: 40px;
    align-items: start;
}

/* 主内容区 */
.cmm-course-main {
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    overflow: hidden;
}

/* 课程大纲 */
.cmm-course-outline {
    border-bottom: 1px solid var(--border-color);
    background: var(--light-gray);
    margin-bottom: 25px;
}

.cmm-outline-title {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 25px;
    margin: 0;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-color);
    cursor: pointer;
    user-select: none;
}

.cmm-outline-toggle {
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
    border-radius: 4px;
    transition: var(--transition);
}

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

.cmm-outline-content {
    padding: 0 25px 20px;
    max-height: 300px;
    overflow-y: auto;
}

.cmm-outline-list {
    list-style: none;
    margin: 0;
    padding: 0;
}

.cmm-outline-list li {
    margin-bottom: 8px;
}

.cmm-outline-list a {
    display: block;
    padding: 8px 12px;
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: var(--radius);
    transition: var(--transition);
    font-size: 0.9rem;
}

.cmm-outline-list a:hover,
.cmm-outline-list a.active {
    background: var(--primary-color);
    color: white;
}

/* 课程内容 */
.cmm-course-content {
    padding: 0;
}

.cmm-content-wrapper {
    padding: 30px;
    line-height: 1.8;
    font-size: 1rem;
    color: var(--text-color);
}

.cmm-content-wrapper h1,
.cmm-content-wrapper h2,
.cmm-content-wrapper h3,
.cmm-content-wrapper h4,
.cmm-content-wrapper h5,
.cmm-content-wrapper h6 {
    color: var(--text-color);
    margin-top: 2em;
    margin-bottom: 1em;
    line-height: 1.3;
    scroll-margin-top: 20px;
}

.cmm-content-wrapper h1 { font-size: 2rem; }
.cmm-content-wrapper h2 { font-size: 1.7rem; }
.cmm-content-wrapper h3 { font-size: 1.4rem; }
.cmm-content-wrapper h4 { font-size: 1.2rem; }

.cmm-content-wrapper p {
    margin-bottom: 1.5em;
}

.cmm-content-wrapper img {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    margin: 20px 0;
    cursor: pointer;
    transition: var(--transition);
}

.cmm-content-wrapper img:hover {
    transform: scale(1.02);
    box-shadow: var(--shadow-lg);
}

.cmm-content-wrapper pre {
    background: var(--light-gray);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 20px;
    overflow-x: auto;
    margin: 20px 0;
    position: relative;
}

.cmm-content-wrapper code {
    background: var(--light-gray);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 0.9em;
}

.cmm-content-wrapper pre code {
    background: none;
    padding: 0;
}

/* 完成标记 */
.cmm-course-completion {
    padding: 30px;
    border-top: 1px solid var(--border-color);
    background: var(--light-gray);
}

.cmm-completion-card {
    background: white;
    border: 2px solid var(--success-color);
    border-radius: var(--radius-lg);
    padding: 30px;
    text-align: center;
    box-shadow: var(--shadow);
}

.cmm-completion-card h3 {
    color: var(--success-color);
    margin: 0 0 10px 0;
    font-size: 1.3rem;
}

.cmm-completion-card p {
    margin: 0 0 20px 0;
    color: var(--text-secondary);
}

.cmm-mark-complete {
    background: var(--success-color);
    color: white;
    border: none;
    border-radius: var(--radius);
    padding: 12px 24px;
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.cmm-mark-complete:hover {
    background: #3d8b40;
    transform: translateY(-1px);
}

/* 课程导航 */
.cmm-course-navigation {
    padding: 30px;
    border-top: 1px solid var(--border-color);
    background: white;
}

.cmm-nav-container {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 20px;
    align-items: center;
}

.cmm-nav-link {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 20px;
    background: var(--light-gray);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    text-decoration: none;
    color: var(--text-color);
    transition: var(--transition);
    min-height: 80px;
}

.cmm-nav-link:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.cmm-nav-prev {
    justify-self: start;
}

.cmm-nav-next {
    justify-self: end;
    flex-direction: row-reverse;
}

.cmm-nav-catalog {
    justify-self: center;
}

.cmm-nav-icon {
    font-size: 1.5rem;
    opacity: 0.8;
}

.cmm-nav-content {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.cmm-nav-label {
    font-size: 0.85rem;
    opacity: 0.8;
    font-weight: 500;
}

.cmm-nav-title {
    font-size: 1rem;
    font-weight: 600;
    line-height: 1.3;
}

/* 侧边栏 */
.cmm-course-sidebar {
    display: flex;
    flex-direction: column;
    gap: 25px;
}

.cmm-sidebar-card {
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    overflow: hidden;
}

.cmm-sidebar-title {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 20px 25px;
    margin: 0;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-color);
    background: var(--light-gray);
    border-bottom: 1px solid var(--border-color);
}

/* 快速信息 */
.cmm-quick-info-content {
    padding: 20px 25px;
}

.cmm-info-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 0;
    border-bottom: 1px solid var(--border-color);
}

.cmm-info-item:last-child {
    border-bottom: none;
}

.cmm-info-label {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.cmm-info-value {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-color);
}

/* 相关课程 */
.cmm-related-list {
    padding: 20px 25px;
}

.cmm-related-item {
    display: flex;
    gap: 15px;
    padding: 15px 0;
    border-bottom: 1px solid var(--border-color);
    text-decoration: none;
    color: var(--text-color);
    transition: var(--transition);
}

.cmm-related-item:last-child {
    border-bottom: none;
}

.cmm-related-item:hover {
    background: var(--light-gray);
    margin: 0 -25px;
    padding-left: 25px;
    padding-right: 25px;
}

.cmm-related-thumb {
    width: 60px;
    height: 60px;
    flex-shrink: 0;
    border-radius: var(--radius);
    overflow: hidden;
}

.cmm-related-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.cmm-thumb-placeholder {
    width: 100%;
    height: 100%;
    background: var(--light-gray);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
}

.cmm-related-content {
    flex: 1;
    min-width: 0;
}

.cmm-related-title {
    font-size: 0.95rem;
    font-weight: 600;
    margin: 0 0 8px 0;
    line-height: 1.3;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.cmm-related-meta {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.cmm-related-meta-item {
    display: flex;
    align-items: center;
    gap: 4px;
    font-size: 0.8rem;
    color: var(--text-muted);
}

.cmm-view-more-link {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 15px 25px;
    background: var(--light-gray);
    color: var(--primary-color);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 600;
    transition: var(--transition);
}

.cmm-view-more-link:hover {
    background: var(--primary-color);
    color: white;
}

/* 学习工具 */
.cmm-tools-list {
    padding: 20px 25px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.cmm-tool-btn {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    background: none;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    color: var(--text-color);
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.9rem;
    text-align: left;
}

.cmm-tool-btn:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

/* 阅读进度指示器 */
.cmm-reading-progress {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: rgba(0, 0, 0, 0.1);
    z-index: 1000;
}

.cmm-progress-bar-container {
    height: 100%;
    background: transparent;
}

.cmm-progress-bar-fill {
    height: 100%;
    background: var(--primary-color);
    width: 0%;
    transition: width 0.1s ease;
}

/* 浮动工具栏 */
.cmm-floating-toolbar {
    position: fixed;
    right: 20px;
    bottom: 20px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    z-index: 999;
}

.cmm-float-btn {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--primary-color);
    color: white;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-lg);
    transition: var(--transition);
}

.cmm-float-btn:hover {
    background: var(--secondary-color);
    transform: scale(1.1);
}

/* ==========================================================================
   JavaScript功能相关样式
   ========================================================================== */

/* 通知系统 */
.cmm-notification {
    position: fixed;
    top: 20px;
    right: 20px;
    background: white;
    border-radius: var(--radius);
    box-shadow: var(--shadow-xl);
    padding: 16px 20px;
    display: flex;
    align-items: center;
    gap: 12px;
    z-index: 1001;
    min-width: 300px;
    transform: translateX(100%);
    opacity: 0;
    transition: all 0.3s ease;
}

.cmm-notification.show {
    transform: translateX(0);
    opacity: 1;
}

.cmm-notification-success {
    border-left: 4px solid var(--success-color);
}

.cmm-notification-error {
    border-left: 4px solid var(--error-color);
}

.cmm-notification-info {
    border-left: 4px solid var(--primary-color);
}

.cmm-notification-message {
    flex: 1;
    font-size: 0.9rem;
    color: var(--text-color);
    line-height: 1.4;
}

.cmm-notification-message small {
    font-size: 0.8rem;
    opacity: 0.8;
}

.cmm-notification-close {
    background: none;
    border: none;
    font-size: 1.2rem;
    cursor: pointer;
    color: var(--text-muted);
    padding: 4px;
    line-height: 1;
}

.cmm-notification-close:hover {
    color: var(--text-color);
}

/* 图片查看器 */
.cmm-image-viewer {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1002;
    display: none;
}

.cmm-viewer-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.9);
    cursor: pointer;
}

.cmm-viewer-content {
    position: relative;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.cmm-viewer-content img {
    max-width: 100%;
    max-height: 100%;
    border-radius: var(--radius);
    box-shadow: var(--shadow-xl);
}

.cmm-viewer-close {
    position: absolute;
    top: 20px;
    right: 20px;
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.2);
    color: white;
    border: none;
    border-radius: 50%;
    font-size: 1.5rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.cmm-viewer-close:hover {
    background: rgba(255, 255, 255, 0.3);
}

/* 代码复制按钮 */
.cmm-code-copy {
    position: absolute;
    top: 10px;
    right: 10px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--radius);
    padding: 6px 12px;
    font-size: 0.8rem;
    cursor: pointer;
    transition: var(--transition);
}

.cmm-code-copy:hover {
    background: var(--secondary-color);
}

.cmm-code-copy.copied {
    background: var(--success-color);
}

/* 模态框样式 */
.cmm-notes-modal,
.cmm-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1003;
    display: none;
}

.cmm-modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    cursor: pointer;
}

.cmm-modal-content {
    position: relative;
    width: 90%;
    max-width: 600px;
    max-height: 80vh;
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    margin: 5vh auto;
    display: flex;
    flex-direction: column;
}

.cmm-modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 25px;
    border-bottom: 1px solid var(--border-color);
}

.cmm-modal-header h3 {
    margin: 0;
    font-size: 1.2rem;
    color: var(--text-color);
}

.cmm-modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-muted);
    padding: 4px;
    line-height: 1;
}

.cmm-modal-close:hover {
    color: var(--text-color);
}

.cmm-modal-body {
    padding: 20px 25px;
    flex: 1;
    overflow-y: auto;
}

.cmm-notes-textarea {
    width: 100%;
    height: 200px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 12px;
    font-family: inherit;
    font-size: 0.9rem;
    line-height: 1.5;
    resize: vertical;
    outline: none;
}

.cmm-notes-textarea:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(33, 150, 243, 0.1);
}

.cmm-modal-footer {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 12px;
    padding: 20px 25px;
    border-top: 1px solid var(--border-color);
}

.cmm-btn {
    padding: 10px 20px;
    border: none;
    border-radius: var(--radius);
    font-size: 0.9rem;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.cmm-btn-primary {
    background: var(--primary-color);
    color: white;
}

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

.cmm-btn-secondary {
    background: var(--light-gray);
    color: var(--text-color);
    border: 1px solid var(--border-color);
}

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

/* 完成动画 */
.cmm-completion-animation {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    display: none;
    z-index: 1004;
}

.cmm-completion-content {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: white;
    border-radius: var(--radius-lg);
    padding: 40px;
    text-align: center;
    box-shadow: var(--shadow-xl);
    min-width: 300px;
}

.cmm-completion-icon {
    font-size: 3rem;
    margin-bottom: 20px;
}

.cmm-completion-content h3 {
    color: var(--success-color);
    margin: 0 0 10px 0;
    font-size: 1.5rem;
}

.cmm-completion-content p {
    margin: 0;
    color: var(--text-secondary);
}

/* 文字大小调整 */
.cmm-content-wrapper.text-small {
    font-size: 0.85rem;
}

.cmm-content-wrapper.text-small h1 { font-size: 1.6rem; }
.cmm-content-wrapper.text-small h2 { font-size: 1.4rem; }
.cmm-content-wrapper.text-small h3 { font-size: 1.2rem; }
.cmm-content-wrapper.text-small h4 { font-size: 1.1rem; }

.cmm-content-wrapper.text-large {
    font-size: 1.1rem;
}

.cmm-content-wrapper.text-large h1 { font-size: 2.4rem; }
.cmm-content-wrapper.text-large h2 { font-size: 2rem; }
.cmm-content-wrapper.text-large h3 { font-size: 1.6rem; }
.cmm-content-wrapper.text-large h4 { font-size: 1.4rem; }

.cmm-content-wrapper.text-extra-large {
    font-size: 1.25rem;
}

.cmm-content-wrapper.text-extra-large h1 { font-size: 2.8rem; }
.cmm-content-wrapper.text-extra-large h2 { font-size: 2.4rem; }
.cmm-content-wrapper.text-extra-large h3 { font-size: 2rem; }
.cmm-content-wrapper.text-extra-large h4 { font-size: 1.6rem; }

/* 专注阅读模式 */
.cmm-reading-mode .cmm-course-sidebar,
.cmm-reading-mode .cmm-floating-toolbar,
.cmm-reading-mode .cmm-course-navigation {
    display: none !important;
}

.cmm-reading-mode .cmm-course-container {
    grid-template-columns: 1fr;
    max-width: 800px;
}

.cmm-reading-mode .cmm-content-wrapper {
    padding: 40px;
    font-size: 1.1rem;
    line-height: 2;
}

/* 大纲层级样式 */
.cmm-outline-level-1 a { padding-left: 12px; font-weight: 600; }
.cmm-outline-level-2 a { padding-left: 20px; }
.cmm-outline-level-3 a { padding-left: 28px; font-size: 0.85rem; }
.cmm-outline-level-4 a { padding-left: 36px; font-size: 0.85rem; }
.cmm-outline-level-5 a { padding-left: 44px; font-size: 0.8rem; }
.cmm-outline-level-6 a { padding-left: 52px; font-size: 0.8rem; }

/* 图标旋转动画 */
.cmm-icon-chevron-down.rotated {
    transform: rotate(180deg);
}

/* 专注模式浮动退出按钮 */
.cmm-focus-exit-btn {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 1005;
    opacity: 1;
    transition: opacity 0.3s ease;
}

.cmm-focus-exit-btn.hidden {
    opacity: 0.3;
}

.cmm-focus-exit-btn:hover {
    opacity: 1 !important;
}

.cmm-exit-focus {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: rgba(0, 0, 0, 0.7);
    color: white;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.cmm-exit-focus:hover {
    background: rgba(244, 67, 54, 0.8);
    transform: scale(1.1);
}

.cmm-exit-focus:active {
    transform: scale(0.95);
}

/* 图标字体 */
.cmm-icon-arrow-left::before { content: "←"; }
.cmm-icon-arrow-right::before { content: "→"; }
.cmm-icon-arrow-up::before { content: "↑"; }
.cmm-icon-clock::before { content: "⏰"; }
.cmm-icon-level::before { content: "📊"; }
.cmm-icon-order::before { content: "📋"; }
.cmm-icon-calendar::before { content: "📅"; }
.cmm-icon-folder::before { content: "📁"; }
.cmm-icon-tag::before { content: "🏷️"; }
.cmm-icon-heart::before { content: "❤️"; }
.cmm-icon-share::before { content: "📤"; }
.cmm-icon-list::before { content: "📝"; }
.cmm-icon-chevron-down::before { content: "⌄"; }
.cmm-icon-check::before { content: "✓"; }
.cmm-icon-grid::before { content: "⊞"; }
.cmm-icon-info::before { content: "ℹ️"; }
.cmm-icon-related::before { content: "🔗"; }
.cmm-icon-course::before { content: "📚"; }
.cmm-icon-clock-small::before { content: "⏱"; }
.cmm-icon-level-small::before { content: "📈"; }
.cmm-icon-tools::before { content: "🛠️"; }
.cmm-icon-print::before { content: "🖨️"; }
.cmm-icon-text-size::before { content: "🔤"; }
.cmm-icon-reading::before { content: "👁️"; }
.cmm-icon-notes::before { content: "📔"; }
.cmm-icon-sidebar::before { content: "⫸"; }
.cmm-icon-play::before { content: "▶"; }
.cmm-icon-close::before { content: "✕"; }

/* ==========================================================================
   保留的原有样式 - 课程列表等
   ========================================================================== */

/* 容器样式 - 统一宽度设置 */
.cmm-course-container,
.cmm-single-course {
    max-width: var(--container-width) !important;
    margin: 0 auto !important;
    padding: var(--container-padding) !important;
    width: 100% !important;
    box-sizing: border-box !important;
}

.cmm-single-course .container {
    padding: 0 !important;
    width: 100% !important;
    max-width: none !important;
    margin: 0 !important;
}

/* 课程头部区域 */
.cmm-course-header {
    text-align: center;
    padding: 20px 20px;
    margin-bottom: 20px;
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    border-radius: 12px;
}

.cmm-main-title {
    font-size: 1.8rem;
    color: #2c3e50;
    margin-bottom: 12px;
    font-weight: 600;
}

.cmm-course-intro {
    max-width: 700px;
    margin: 0 auto 20px;
}

.cmm-course-intro p {
    font-size: 1rem;
    line-height: 1.6;
    color: #495057;
    margin: 0;
}

/* 搜索框样式 */
.cmm-simple-search {
    max-width: 400px;
    margin: 0 auto;
    position: relative;
}

.cmm-search-form {
    display: flex;
    position: relative;
    width: 100%;
}

.cmm-search-input {
        flex: 1;
    padding: 12px 50px 12px 20px;
    border: 2px solid var(--border-color);
    border-radius: 25px;
    font-size: 16px;
    outline: none;
    transition: all 0.3s ease;
    background: white;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.cmm-search-input:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(33, 150, 243, 0.1);
}

.cmm-search-btn {
    position: absolute;
    right: 8px;
    top: 50%;
    transform: translateY(-50%);
    width: 36px;
    height: 36px;
    background: transparent;
    border: none;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 4px;
}

.cmm-search-btn:hover {
    background: rgba(33, 150, 243, 0.1);
    transform: translateY(-50%) scale(1.05);
    }

.cmm-search-btn:active {
    transform: translateY(-50%) scale(0.95);
}

.cmm-icon-search {
    display: block;
    width: 20px;
    height: 20px;
    position: relative;
}

.cmm-icon-search:before {
    content: "🔍";
    color: #666;
    font-size: 18px;
    line-height: 1;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

/* 目录导航 */
.cmm-catalog-nav {
    margin-bottom: 15px;
}

.cmm-catalog-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 12px;
    margin-bottom: 15px;
}

.cmm-catalog-nav-item {
    display: flex;
    align-items: center;
    padding: 15px;
    background: white;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    cursor: pointer;
    transition: all 0.3s ease;
}

.cmm-catalog-nav-item:hover {
    border-color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(33, 150, 243, 0.15);
}

.cmm-catalog-nav-item.active {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.cmm-catalog-icon {
    font-size: 2rem;
    margin-right: 15px;
    flex-shrink: 0;
}

.cmm-catalog-info h3 {
    margin: 0 0 5px 0;
    font-size: 1.1rem;
    font-weight: 600;
}

.cmm-catalog-info p {
    margin: 0 0 8px 0;
    font-size: 0.9rem;
    opacity: 0.8;
    line-height: 1.4;
}

.cmm-course-count {
    font-size: 0.8rem;
    background: rgba(255, 255, 255, 0.2);
    padding: 3px 8px;
    border-radius: 12px;
    display: inline-block;
}

.cmm-catalog-nav-item.active .cmm-course-count {
    background: rgba(255, 255, 255, 0.3);
}

/* 课程列表区域 */
.cmm-course-content {
    margin-top: 10px;
    width: 100% !important;
    box-sizing: border-box !important;
}

.cmm-catalog-section {
    margin-bottom: 20px;
    display: none;
}

.cmm-catalog-section.active {
    display: block;
}

.cmm-catalog-section h2 {
    font-size: 1.5rem;
    color: var(--text-color);
        margin-bottom: 12px;
    padding-bottom: 6px;
    border-bottom: 2px solid var(--primary-color);
    }

/* 简洁的课程列表样式 */
.cmm-course-list-simple {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.cmm-course-item {
    padding: 18px;
    background: white;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    transition: all 0.3s ease;
    box-shadow: var(--shadow);
    position: relative;
}

.cmm-course-item:hover {
    border-color: var(--primary-color);
    box-shadow: 0 4px 20px rgba(33, 150, 243, 0.15);
    transform: translateY(-2px);
}

.cmm-course-content-wrapper {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

/* 第一行：元数据标签 */
.cmm-course-first-line {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
    margin-bottom: 4px;
}

.cmm-course-icon {
    font-size: 1.2rem;
    color: var(--primary-color);
}

.cmm-category-label {
    background: var(--primary-color);
    color: white;
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.3px;
}

.cmm-meta-item {
    display: flex;
    align-items: center;
    font-size: 0.85rem;
    color: var(--text-muted);
    gap: 6px;
    background: var(--light-gray);
    padding: 4px 10px;
    border-radius: 12px;
    font-weight: 500;
}

.cmm-meta-icon {
    font-size: 0.9rem;
}

/* 第二行：标题和按钮 */
.cmm-course-second-line {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    margin: 0;
}

.cmm-course-title {
    font-size: 1.3rem;
    font-weight: 700;
    margin: 0;
    line-height: 1.4;
    flex: 1;
    color: var(--text-color);
}

.cmm-course-title a {
    color: inherit;
    text-decoration: none;
    transition: var(--transition);
}

.cmm-course-title a:hover {
    color: var(--primary-color);
}

.cmm-course-action-btn {
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--radius);
    padding: 12px 24px;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    white-space: nowrap;
    box-shadow: 0 2px 8px rgba(33, 150, 243, 0.25);
}

.cmm-course-action-btn:hover {
    background: var(--secondary-color);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(33, 150, 243, 0.35);
}

.cmm-course-action-btn:active {
    transform: translateY(0);
}

/* 第三行：课程介绍 */
.cmm-course-third-line {
    margin: 0;
}

.cmm-course-excerpt {
    font-size: 1rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin: 0;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* 移除旧的课程链接样式 */
.cmm-course-link {
    display: none;
}

/* 搜索结果样式 */
.cmm-search-results {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: white;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    max-height: 400px;
    overflow-y: auto;
    z-index: 1000;
    display: none;
}

.cmm-search-results-list {
    padding: 0;
}

.cmm-search-result-item {
    border-bottom: 1px solid var(--border-color);
    transition: var(--transition);
}

.cmm-search-result-item:hover {
    background: var(--light-gray);
}

.cmm-search-result-link {
    display: block;
    padding: 15px 20px;
    text-decoration: none;
    color: var(--text-color);
}

.cmm-search-result-title {
    margin: 0;
    font-size: 0.95rem;
    font-weight: 600;
}

.cmm-no-results {
    padding: 20px;
    text-align: center;
}

.cmm-no-results p {
    margin: 0 0 5px 0;
    color: var(--text-color);
}

.cmm-no-results span {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.cmm-search-loading {
    padding: 20px;
    text-align: center;
    color: var(--text-muted);
}

.cmm-search-error {
    padding: 20px;
    text-align: center;
    color: var(--error-color);
    background: #ffeaea;
    border-radius: var(--radius);
    margin: 10px;
}

/* ==========================================================================
   性能优化相关样式
   ========================================================================== */

/* 错误通知样式 */
.cmm-error-notification {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 9999;
    max-width: 350px;
    background: #fff;
    border: 1px solid #f56c6c;
    border-left: 4px solid #f56c6c;
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    animation: slideInFromRight 0.3s ease-out;
}

.cmm-error-content {
    display: flex;
    align-items: center;
    padding: 15px;
    gap: 10px;
}

.cmm-error-icon {
    font-size: 1.2rem;
    color: #f56c6c;
}

.cmm-error-message {
    flex: 1;
    font-size: 0.9rem;
    color: #333;
    line-height: 1.4;
}

.cmm-error-close {
    background: none;
    border: none;
    font-size: 1.4rem;
    color: #999;
    cursor: pointer;
    padding: 0;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: all 0.2s ease;
}

.cmm-error-close:hover {
    background: #f0f0f0;
    color: #666;
}

@keyframes slideInFromRight {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

/* 回退头像样式 */
.cmm-fallback-avatar {
    border-radius: 50%;
    background: var(--light-gray);
    opacity: 0.8;
    border: 2px solid var(--border-color);
}

.cmm-error-image {
    opacity: 0.5;
    filter: grayscale(100%);
}

/* 延迟加载占位符 */
.cmm-lazy-placeholder {
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
    border-radius: var(--radius);
    height: 200px;
    margin-bottom: 20px;
}

@keyframes shimmer {
    0% {
        background-position: 200% 0;
    }
    100% {
        background-position: -200% 0;
    }
}

/* 性能优化指示器 */
.cmm-performance-indicator {
    position: fixed;
    bottom: 20px;
    left: 20px;
    background: rgba(0, 0, 0, 0.7);
    color: white;
    padding: 8px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    z-index: 1000;
    display: none;
}

.cmm-performance-indicator.show {
    display: block;
    animation: fadeIn 0.3s ease-out;
}

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

/* 网络状态指示器 */
.cmm-network-status {
    position: fixed;
    bottom: 60px;
    right: 20px;
    background: var(--warning-color);
    color: white;
    padding: 10px 15px;
    border-radius: var(--radius);
    font-size: 0.85rem;
    z-index: 9999;
    display: none;
    animation: slideInFromRight 0.3s ease-out;
}

.cmm-network-status.offline {
    background: var(--error-color);
}

.cmm-network-status.online {
    background: var(--success-color);
    animation: slideOutToRight 0.3s ease-out 2s forwards;
}

@keyframes slideOutToRight {
    from {
        transform: translateX(0);
        opacity: 1;
    }
    to {
        transform: translateX(100%);
        opacity: 0;
    }
}

/* ==========================================================================
   响应式设计
   ========================================================================== */

@media (max-width: 1024px) {
    .cmm-course-container {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    
    .cmm-course-sidebar {
        order: -1;
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
        gap: 20px;
    }
    
    .cmm-nav-container {
        grid-template-columns: 1fr;
        gap: 15px;
    }
    
    .cmm-nav-link {
        justify-self: stretch;
    }
    
    .cmm-nav-next {
        flex-direction: row;
    }
}

@media (max-width: 768px) {
    :root {
        --container-padding: 15px;
    }
    
    .cmm-course-hero {
        padding: 40px 0 30px;
    }
    
    .cmm-hero-content {
        padding: 0 15px;
    }
    
    .cmm-course-hero .cmm-course-title {
        font-size: 1.8rem;
    }
    
    .cmm-course-meta-cards {
        grid-template-columns: 1fr;
        gap: 10px;
    }
    
    .cmm-meta-card {
        padding: 12px;
    }
    
    .cmm-taxonomy-group {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }
    
    .cmm-course-actions {
        flex-direction: column;
        align-items: stretch;
        gap: 10px;
    }
    
    .cmm-action-btn {
        justify-content: center;
    }
    
    .cmm-course-container {
        padding: 20px 15px;
    }
    
    .cmm-content-wrapper {
        padding: 20px;
    }
    
    .cmm-course-navigation {
        padding: 20px;
    }
    
    .cmm-nav-link {
        padding: 15px;
        min-height: 60px;
    }
    
    .cmm-nav-content {
        gap: 2px;
    }
    
    .cmm-nav-title {
        font-size: 0.9rem;
    }
    
    .cmm-sidebar-card {
        margin-bottom: 0;
    }
    
    .cmm-floating-toolbar {
        right: 15px;
        bottom: 15px;
    }
    
    .cmm-float-btn {
        width: 44px;
        height: 44px;
    }
    
    .cmm-notification {
        right: 10px;
        left: 10px;
        min-width: auto;
    }
    
    .cmm-modal-content {
        width: 95%;
        margin: 2.5vh auto;
        max-height: 95vh;
    }
}

@media (max-width: 480px) {
    .cmm-course-hero .cmm-course-title {
        font-size: 1.5rem;
    }
    
    .cmm-course-excerpt {
        font-size: 1rem;
    }
    
    .cmm-progress-container {
        min-width: auto;
        flex-direction: column;
        gap: 6px;
        text-align: center;
    }
    
    .cmm-content-wrapper {
        padding: 15px;
        font-size: 0.95rem;
    }
    
    .cmm-content-wrapper h1 { font-size: 1.6rem; }
    .cmm-content-wrapper h2 { font-size: 1.4rem; }
    .cmm-content-wrapper h3 { font-size: 1.2rem; }
    
    .cmm-nav-link {
        flex-direction: column;
        text-align: center;
        gap: 8px;
    }
    
    .cmm-nav-icon {
        order: -1;
    }
    
    .cmm-related-item {
        flex-direction: column;
        text-align: center;
        gap: 10px;
    }
    
    .cmm-related-thumb {
        align-self: center;
    }
    
    .cmm-modal-header,
    .cmm-modal-body,
    .cmm-modal-footer {
        padding: 15px 20px;
    }
    
    .cmm-modal-footer {
        flex-direction: column;
        gap: 8px;
    }
    
    .cmm-btn {
        width: 100%;
        justify-content: center;
    }
}

/* 打印样式 */
@media print {
    .cmm-floating-toolbar,
    .cmm-course-actions,
    .cmm-course-navigation,
    .cmm-reading-progress,
    .cmm-notification {
        display: none !important;
    }
    
    .cmm-course-container {
        grid-template-columns: 1fr;
        max-width: none;
        padding: 0;
    }
    
    .cmm-course-hero {
        background: none !important;
        color: black !important;
        padding: 20px 0;
    }
    
    .cmm-course-sidebar {
        display: none;
    }
    
    .cmm-course-main {
        box-shadow: none;
    }
}