@import url('https://fonts.googleapis.com/css2?family=Oswald:wght@700&display=swap');

/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f5f5f5;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    margin: 0;
    padding: 0;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    flex: 1;
}

/* 导航栏样式 */
.navbar {
    background: linear-gradient(135deg, #ffffff 0%, #f8f9ff 100%);
    box-shadow: 0 4px 20px rgba(102, 126, 234, 0.15);
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: 15px 0;
    border-bottom: 1px solid rgba(102, 126, 234, 0.1);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand {
    font-size: 1.5rem;
    font-weight: bold;
    color: #2c3e50;
    text-decoration: none;
    text-shadow: 0 1px 2px rgba(0,0,0,0.1);
}

.site-nav-menu {
    display: flex;
    list-style: none;
    gap: 30px;
    margin: 0;
    padding: 0;
}

.nav-item {
    display: inline-block;
}

.nav-link {
    color: #2c3e50;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    padding: 10px 15px;
    border-radius: 20px;
    text-shadow: 0 1px 1px rgba(0,0,0,0.1);
}

.nav-link:hover {
    color: #667eea;
    background: rgba(102, 126, 234, 0.1);
    transform: translateY(-1px);
}

.nav-link.active {
    color: #667eea;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.15) 0%, rgba(118, 75, 162, 0.15) 100%);
    font-weight: 700;
}

/* 导航栏链接样式优化 */
.navbar .nav-link, .navbar .nav-brand {
    color: #1a252f;
    text-shadow: none;
}

.navbar .nav-link:hover {
    color: #667eea;
    background: rgba(102, 126, 234, 0.2);
}

.navbar .nav-link.active {
    color: #667eea;
    background: rgba(102, 126, 234, 0.3);
}

.nav-cta {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 10px 20px;
}

.nav-cta:hover {
    background: linear-gradient(135deg, #5a6fd8 0%, #6a4190 100%);
    transform: translateY(-2px);
}

/* 汉堡菜单样式 */
.nav-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
    padding: 5px;
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background: #2c3e50;
    margin: 3px 0;
    transition: 0.3s;
    border-radius: 2px;
}

.nav-toggle.active span:nth-child(1) {
    transform: rotate(-45deg) translate(-5px, 6px);
}

.nav-toggle.active span:nth-child(2) {
    opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
    transform: rotate(45deg) translate(-5px, -6px);
}

@media (max-width: 768px) {
    .nav-container {
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
    }
    
    .nav-toggle {
        display: flex;
        z-index: 1001;
        position: relative;
        pointer-events: auto;
        padding: 15px 20px;
        background: transparent;
        border: none;
        margin: -10px 0;
        min-width: 50px;
        min-height: 44px;
    }
    
    .site-nav-menu {
    position: fixed;
    top: 70px;
    left: 0;
    width: 100%;
    background: linear-gradient(135deg, #ffffff 0%, #f8f9ff 100%);
    flex-direction: column;
    gap: 0;
    text-align: center;
    padding: 0;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease, padding 0.4s ease;
    box-shadow: 0 4px 20px rgba(102, 126, 234, 0.15);
    z-index: 998;
}
    
    .site-nav-menu.active {
    max-height: 500px;
    padding: 20px 0;
}
    
    .nav-item {
        margin: 5px 0;
    }
    
    .nav-link {
        padding: 15px 20px;
        display: block;
        border-radius: 0;
    }
    
    .nav-link:hover {
        background: rgba(102, 126, 234, 0.1);
    }
    
    .nav-link.active {
        background: rgba(102, 126, 234, 0.15);
    }
    
    /* 确保banner不被导航栏遮挡 */
}

/* 首页专属样式 */
.hero-section {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    text-align: center;
    padding: 80px 20px;
    margin-bottom: 50px;
}

.hero-section h1 {
    font-size: 3rem;
    margin-bottom: 20px;
    font-weight: 700;
}

.hero-section p {
    font-size: 1.3rem;
    opacity: 0.9;
    margin-bottom: 30px;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.hero-cta {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
}

.feature-section {
    padding: 60px 20px;
    background: white;
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    color: #333;
    margin-bottom: 50px;
    font-weight: 600;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    max-width: 1200px;
    margin: 0 auto;
}

.feature-card {
    background: #f8f9fa;
    padding: 40px 30px;
    border-radius: 20px;
    text-align: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.15);
    margin-bottom: 20px;
}

.course-feature-icon {
    font-size: 3rem;
    color: #667eea;
}

.feature-card h3 {
    font-size: 1.5rem;
    color: #333;
    margin-bottom: 15px;
}

.feature-card p {
    color: #666;
    line-height: 1.6;
}

.courses-section {
    padding: 60px 20px;
    background: #f5f5f5;
}

.courses-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
    max-width: 1200px;
    margin: 0 auto;
}

.course-card-large {
    background: white;
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 8px 25px rgba(0,0,0,0.1);
    transition: transform 0.3s ease;
}

.course-card-large:hover {
    transform: translateY(-5px);
}

.course-image {
    height: 200px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.2rem;
    font-weight: 600;
}

.course-content {
    padding: 30px;
}

.course-content h3 {
    font-size: 1.4rem;
    color: #333;
    margin-bottom: 15px;
}

.course-content p {
    color: #666;
    margin-bottom: 20px;
    line-height: 1.6;
}

.course-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.course-price {
    font-size: 1.5rem;
    color: #e74c3c;
    font-weight: bold;
}

.price-container {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

.current-price {
    color: #e74c3c;
    font-size: 1.5rem;
    font-weight: bold;
}

.original-price {
    color: #999;
    font-size: 1.1rem;
    text-decoration: line-through;
    margin-left: 5px;
}

.discount-badge {
    background: linear-gradient(135deg, #ff6b6b, #ff8e53);
    color: white;
    font-size: 0.8rem;
    padding: 4px 8px;
    border-radius: 12px;
    font-weight: bold;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); }
}

.course-stats {
    color: #666;
    font-size: 0.9rem;
}

.about-section {
    padding: 60px 20px;
    background: white;
    text-align: center;
}

.about-content {
    max-width: 800px;
    margin: 0 auto;
    font-size: 1.1rem;
    line-height: 1.8;
    color: #555;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin: 50px auto;
    max-width: 1000px;
}

.stat-item {
    text-align: center;
    background: linear-gradient(135deg, #ffffff 0%, #f8f9fa 100%);
    padding: 30px 20px;
    border-radius: 15px;
    box-shadow: 0 8px 25px rgba(0,0,0,0.08);
    border: 1px solid #e9ecef;
    transition: all 0.3s ease;
}

.stat-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 30px rgba(0,0,0,0.12);
    border-color: #667eea;
}

.stat-icon {
    font-size: 2.5rem;
    margin-bottom: 15px;
    color: #667eea;
}

.stat-number {
    font-size: 2.5rem;
    font-weight: bold;
    color: #165DFF;
    margin-bottom: 10px;
    line-height: 1.2;
}

.stat-label {
    color: #6c757d;
    font-size: 1.1rem;
    font-weight: 500;
}

.cta-section {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    text-align: center;
    padding: 80px 20px;
}

.cta-section h2 {
    font-size: 2.5rem;
    margin-bottom: 20px;
}

.cta-section p {
    font-size: 1.2rem;
    margin-bottom: 30px;
    opacity: 0.9;
}

.cta-section .primary-btn {
    width: auto;
    min-width: 150px;
    max-width: 200px;
    display: inline-block;
    margin: 10px 5px;
}

@media (min-width: 769px) {
    .hero-cta .primary-btn,
    .hero-cta .secondary-btn {
        width: 140px;
        padding: 8px 20px;
        font-size: 0.9rem;
    }
    
    .cta-section .primary-btn {
        min-width: 140px;
        max-width: 160px;
        padding: 10px 25px;
        font-size: 0.95rem;
    }
}

@media (max-width: 768px) {
    .hero-section h1 {
        font-size: 2.2rem;
    }
    
    .hero-section p {
        font-size: 1.1rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .features-grid,
    .courses-grid {
        grid-template-columns: 1fr;
    }
    
    .hero-cta {
        flex-direction: column;
        align-items: center;
    }
    
    .hero-cta .primary-btn,
    .hero-cta .secondary-btn {
        width: 160px;
        padding: 10px 25px;
        font-size: 0.95rem;
    }
}

/* 头部样式 */
header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    text-align: center;
    padding: 40px 20px;
    margin-bottom: 30px;
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
}

header p {
    font-size: 1.2rem;
    opacity: 0.9;
}

/* 按钮样式 */
.btn, .primary-btn, .secondary-btn, .confirm-btn, .download-btn {
    display: inline-block;
    padding: 10px 25px;
    border: none;
    border-radius: 22px;
    font-size: 0.95rem;
    cursor: pointer;
    text-decoration: none;
    text-align: center;
    transition: all 0.3s ease;
}

.primary-btn, .confirm-btn {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    width: 100%;
    margin: 10px 0;
}

.secondary-btn {
    background: #f8f9fa;
    color: #667eea;
    border: 1px solid #667eea;
    width: 100%;
    margin: 10px 0;
}

.btn:hover, .primary-btn:hover, .secondary-btn:hover, .confirm-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

/* 课程卡片样式 */
.course-list {
    margin-bottom: 30px;
}

.course-card {
    background: white;
    border-radius: 15px;
    padding: 30px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    margin-bottom: 20px;
}

.course-card h3 {
    font-size: 1.5rem;
    margin-bottom: 10px;
    color: #667eea;
}

.course-desc {
    color: #666;
    margin-bottom: 15px;
}

.course-features {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 15px;
}

.course-features span {
    background: #f0f0f0;
    padding: 5px 10px;
    border-radius: 15px;
    font-size: 0.9rem;
    color: #555;
}

.price {
    font-size: 1.8rem;
    font-weight: bold;
    color: #e74c3c;
    margin-bottom: 20px;
}

/* 课程详情样式 */
.course-info h2 {
    color: #333;
    margin: 25px 0 15px 0;
    border-bottom: 2px solid #667eea;
    padding-bottom: 5px;
}

.course-info h3 {
    color: #555;
    margin: 20px 0 10px 0;
}

.course-content-list {
    margin: 20px 0;
}

.content-item {
    background: #f8f9fa;
    padding: 20px;
    border-radius: 10px;
    margin-bottom: 15px;
}

.content-item h4 {
    color: #667eea;
    margin-bottom: 10px;
}

.content-item ul {
    margin-left: 20px;
}

.content-item li {
    margin-bottom: 5px;
    color: #555;
}

.target-users {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin: 15px 0;
}

.user-tag {
    background: #e3f2fd;
    color: #1976d2;
    padding: 8px 15px;
    border-radius: 20px;
    font-size: 0.9rem;
}

.price-section {
    background: #fff3cd;
    padding: 20px;
    border-radius: 10px;
    margin: 20px 0;
    text-align: center;
}

.price-value {
    font-size: 2rem;
    color: #e74c3c;
}

/* 视频列表样式 */
.course-video-list-container {
    margin-top: 30px;
    background: white;
    border-radius: 15px;
    padding: 20px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.course-video-list-container h3 {
    color: #667eea;
    margin-bottom: 15px;
    font-size: 1.3rem;
}

.video-scroll-container {
    max-height: 300px;
    overflow-y: auto;
    border: 1px solid #e0e0e0;
    border-radius: 10px;
    padding: 10px;
}

.course-video-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.course-video-item {
    display: flex;
    align-items: center;
    padding: 12px 15px;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    border: 1px solid transparent;
}

.course-video-item:hover {
    background: #f8f9fa;
    transform: translateX(5px);
}

.course-video-item.current {
    background: linear-gradient(135deg, #667eea20 0%, #764ba220 100%);
    border-color: #667eea;
    box-shadow: 0 2px 8px rgba(102, 126, 234, 0.3);
}

.video-number {
    background: #667eea;
    color: white;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.9rem;
    font-weight: bold;
    margin-right: 15px;
    flex-shrink: 0;
}

.course-video-item.current .video-number {
    background: #fff;
    color: #667eea;
    box-shadow: 0 0 0 2px #667eea;
}

.video-title {
    flex: 1;
    font-size: 0.95rem;
    color: #333;
    font-weight: 500;
}

.course-video-item.current .video-title {
    color: #667eea;
    font-weight: 600;
}

.video-duration {
    color: #888;
    font-size: 0.85rem;
    margin-left: 10px;
    flex-shrink: 0;
}

/* 视频播放器控制按钮 */
.video-controls {
    display: flex;
    gap: 10px;
    margin-top: 15px;
    justify-content: center;
}

.video-controls button {
    padding: 8px 20px;
    border: none;
    border-radius: 20px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.3s ease;
}

.video-controls .prev-btn {
    background: #f8f9fa;
    color: #667eea;
    border: 1px solid #667eea;
}

.video-controls .next-btn {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.video-controls button:hover {
    transform: translateY(-2px);
    box-shadow: 0 2px 8px rgba(0,0,0,0.2);
}

.video-controls button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

/* 预览区域样式 */
.preview-section {
    margin-top: 30px;
    padding: 20px;
    background: #f8f9fa;
    border-radius: 10px;
}

.video-preview {
    text-align: center;
}

.video-preview video {
    border-radius: 10px;
    margin-bottom: 10px;
}

.preview-note {
    color: #666;
    font-size: 0.9rem;
}

/* 支付页面样式 */
.payment-container, .success-container {
    background: white;
    border-radius: 15px;
    padding: 30px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.order-summary {
    margin-bottom: 30px;
}

.order-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 0;
    border-bottom: 1px solid #eee;
}

.item-info h4 {
    color: #333;
    margin-bottom: 5px;
}

.item-desc {
    color: #666;
    font-size: 0.9rem;
}

.item-price {
    font-size: 1.2rem;
    font-weight: bold;
    color: #e74c3c;
}

.order-total {
    margin-top: 20px;
    padding: 15px;
    background: #f8f9fa;
    border-radius: 10px;
}

.total-row {
    display: flex;
    justify-content: space-between;
    margin-bottom: 10px;
}

.final-price {
    font-size: 1.5rem;
    font-weight: bold;
    color: #e74c3c;
}

.payment-method {
    margin-bottom: 30px;
}

.payment-option {
    display: flex;
    align-items: center;
    padding: 15px;
    border: 2px solid #eee;
    border-radius: 10px;
    margin-bottom: 10px;
}

.payment-option.active {
    border-color: #667eea;
    background: #f8f9fa;
}

.payment-icon {
    font-size: 2rem;
    margin-right: 15px;
}

.payment-info h4 {
    margin-bottom: 5px;
    color: #333;
}

.payment-info p {
    color: #666;
    font-size: 0.9rem;
}

.payment-actions {
    margin: 30px 0;
}

.cancel-link {
    display: block;
    text-align: center;
    color: #666;
    margin-top: 15px;
    text-decoration: none;
}

.cancel-link:hover {
    color: #667eea;
}

.payment-notice {
    background: #fff3cd;
    border: 1px solid #ffeaa7;
    border-radius: 10px;
    padding: 15px;
    text-align: center;
    color: #856404;
}

/* 成功页面样式 */
.success-icon {
    font-size: 4rem;
    text-align: center;
    margin-bottom: 20px;
}

.success-message {
    text-align: center;
    font-size: 1.2rem;
    margin-bottom: 30px;
    color: #667eea;
}

.order-details {
    background: #f8f9fa;
    border-radius: 10px;
    padding: 20px;
    margin-bottom: 30px;
}

.detail-item {
    display: flex;
    justify-content: space-between;
    margin-bottom: 10px;
    padding: 5px 0;
}

.next-actions {
    margin: 30px 0;
}

.support-info {
    text-align: center;
    color: #666;
    margin-top: 20px;
    font-size: 0.9rem;
}

/* 完整课程页面样式 */
.full-course-container {
    background: white;
    border-radius: 15px;
    padding: 30px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.access-info {
    background: #d4edda;
    border: 1px solid #c3e6cb;
    border-radius: 10px;
    padding: 15px;
    margin-bottom: 30px;
    color: #155724;
    text-align: center;
}

.video-container {
    margin-bottom: 30px;
}

.video-player video {
    border-radius: 10px;
    margin-bottom: 20px;
}

.chapter-list {
    margin-top: 20px;
}

.chapter-item {
    display: flex;
    align-items: center;
    padding: 15px;
    border: 1px solid #eee;
    border-radius: 10px;
    margin-bottom: 10px;
}

.chapter-number {
    background: #667eea;
    color: white;
    width: 30px;
    height: 30px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 15px;
    font-weight: bold;
}

.chapter-title {
    flex: 1;
    color: #333;
}

.chapter-duration {
    color: #666;
    font-size: 0.9rem;
}

.course-materials {
    margin-top: 30px;
}

.material-list {
    margin-top: 15px;
}

.material-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 15px;
    border: 1px solid #eee;
    border-radius: 10px;
    margin-bottom: 10px;
}

.material-item span:first-child {
    font-size: 1.5rem;
    margin-right: 10px;
}

.material-item span:nth-child(2) {
    flex: 1;
    color: #333;
}

.download-btn {
    background: #667eea;
    color: white;
    padding: 8px 20px;
    border-radius: 20px;
    font-size: 0.9rem;
}

.back-action {
        margin-top: 30px;
        text-align: center;
    }

    /* 视频布局 - 上下排列 */
    .video-layout {
        max-width: 1000px;
        margin: 0 auto;
        display: flex;
        flex-direction: column;
        gap: 30px;
    }

    .video-main {
        background: white;
        border-radius: 12px;
        padding: 30px;
        box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    }

    /* 播放列表容器：与视频主容器视觉一致，独立卡片展示 */
    .video-list-container {
        background: white;
        border-radius: 12px;
        padding: 30px;
        box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    }

    .video-player {
        margin-bottom: 20px;
    }

    .video-player video {
        width: 100%;
        height: 500px;
        border-radius: 8px;
        background: #000;
        box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
    }

    #currentVideoTitle {
        text-align: center;
        margin-bottom: 20px;
        color: #333;
        font-size: 1.5em;
    }

    .video-controls {
        display: flex;
        gap: 15px;
        justify-content: center;
        margin-top: 20px;
    }

    .control-btn {
        padding: 12px 30px;
        border: none;
        border-radius: 25px;
        background: linear-gradient(135deg, #007bff, #0056b3);
        color: white;
        cursor: pointer;
        transition: all 0.3s ease;
        font-size: 16px;
        font-weight: 500;
    }

    .control-btn:hover:not(:disabled) {
        transform: translateY(-2px);
        box-shadow: 0 4px 15px rgba(0, 123, 255, 0.3);
    }

    .control-btn:disabled {
        background: #6c757d;
        cursor: not-allowed;
        transform: none;
        box-shadow: none;
    }

    /* 视频列表 - 网格布局 */
.video-list-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 15px;
    max-height: 400px;
    overflow-y: auto;
    padding: 10px;
}

.video-list-grid .video-item {
    display: flex;
    align-items: center;
    padding: 15px;
    background: #f8f9fa;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    border: 2px solid transparent;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.video-list-grid .video-item:hover {
    background: #e9ecef;
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.15);
}

.video-list-grid .video-item.active {
    background: linear-gradient(135deg, #007bff, #0056b3);
    color: white;
    border-color: #0056b3;
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(0, 123, 255, 0.3);
}

.video-list-grid .video-number {
    font-weight: bold;
    margin-right: 12px;
    min-width: 30px;
    font-size: 1.1em;
}

.video-list-grid .video-title {
    font-size: 14px;
    line-height: 1.4;
    flex: 1;
}

    /* 响应式设计 */
    @media (max-width: 768px) {
        .video-layout {
            gap: 20px;
        }
        
        .video-main,
        .video-list-container {
            padding: 20px;
        }
        
        .video-player video {
            height: 300px;
        }
        
        .video-list-grid {
            grid-template-columns: 1fr;
            max-height: 300px;
        }
        
        .control-btn {
            padding: 10px 20px;
            font-size: 14px;
        }
    }

    @media (max-width: 480px) {
        .video-player video {
            height: 200px;
        }
        
        .video-controls {
            flex-direction: column;
            align-items: center;
        }
    }

/* B2C模式新增样式 */
html {
    scroll-behavior: smooth;
}

.site-header {
    background: linear-gradient(135deg, #1e3c72 0%, #2a5298 100%);
    color: white;
    padding: 0;
    margin-bottom: 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
    max-width: 1200px;
    margin: 0 auto;
}

.logo-section h1 {
    font-size: 1.5rem;
    margin: 0;
    font-weight: 600;
}

.tagline {
    font-size: 0.9rem;
    opacity: 0.9;
    margin: 0;
}

.nav-menu {
    display: flex;
    gap: 30px;
    align-items: center;
}

.nav-menu a {
    color: white;
    text-decoration: none;
    font-weight: 500;
    transition: opacity 0.3s ease;
    font-size: 0.95rem;
}

.nav-menu a:hover {
    opacity: 0.8;
}

.hero-section {
    background: linear-gradient(135deg, #1e3c72 0%, #2a5298 100%);
    color: white;
    padding: 120px 0 80px;
    text-align: center;
    position: relative;
}

.hero-content h1 {
    font-size: 52px;
    margin-bottom: 15px;
    font-weight: 700;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 22px;
    margin-bottom: 40px;
    opacity: 0.9;
    font-weight: 300;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 60px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

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

.stat-number {
    display: block;
    font-size: 36px;
    font-weight: bold;
    margin-bottom: 5px;
    color: #165DFF;
}

.stat-label {
    font-size: 16px;
    opacity: 0.8;
    font-weight: 300;
}

.hero-desc {
    font-size: 18px;
    margin-bottom: 40px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.6;
}

.hero-actions {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
}

.cta-button {
    background: #ff6b35;
    color: white;
    padding: 15px 40px;
    border: none;
    border-radius: 30px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-block;
}

.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(255, 107, 53, 0.4);
}

@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        gap: 15px;
    }
    
    .nav-menu {
        gap: 20px;
    }
    
    .hero-content h2 {
        font-size: 2rem;
    }
}

/* 新增内容区块样式 */
.instructors-section {
    padding: 80px 0;
    background: white;
}

.instructors-section h2 {
    text-align: center;
    margin-bottom: 15px;
    color: #2c3e50;
    font-size: 36px;
}

.instructors-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
    max-width: 1200px;
    margin: 0 auto;
}

.instructor-card {
    text-align: center;
    padding: 40px 30px;
    background: #f8f9fa;
    border-radius: 10px;
    transition: transform 0.3s ease;
}

.instructor-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.1);
}

.instructor-avatar {
    font-size: 64px;
    margin-bottom: 20px;
    width: 100px;
    height: 100px;
    margin: 0 auto 20px;
    background: #3498db;
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.instructor-card h3 {
    color: #2c3e50;
    margin-bottom: 10px;
    font-size: 24px;
}

.instructor-title {
    color: #3498db;
    font-weight: bold;
    margin-bottom: 15px;
    font-size: 16px;
}

.instructor-desc {
    color: #7f8c8d;
    margin-bottom: 20px;
    font-size: 15px;
    line-height: 1.6;
}

.instructor-stats {
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
}

.instructor-stats span {
    background: white;
    color: #2c3e50;
    padding: 8px 15px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 500;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.services-section {
    padding: 80px 0;
    background: #f8f9fa;
}

.services-section h2 {
    text-align: center;
    margin-bottom: 50px;
    color: #2c3e50;
    font-size: 36px;
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    max-width: 1000px;
    margin: 0 auto;
}

.service-item {
    text-align: center;
    padding: 40px 30px;
    background: white;
    border-radius: 10px;
    transition: transform 0.3s ease;
    box-shadow: 0 3px 15px rgba(0,0,0,0.08);
}

.service-item:hover {
    transform: translateY(-5px);
}

.service-icon {
    font-size: 48px;
    margin-bottom: 20px;
}

.service-item h3 {
    color: #2c3e50;
    margin-bottom: 15px;
    font-size: 20px;
}

.service-item p {
    color: #7f8c8d;
    font-size: 16px;
}

.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background: white;
    margin-bottom: 20px;
    padding: 25px;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.faq-item h3 {
    color: #1e3c72;
    margin-bottom: 10px;
    font-size: 1.1rem;
}

.faq-item p {
    color: #555;
    line-height: 1.6;
    margin: 0;
}

.contact-section {
    background: #f8f9fa;
    padding: 60px 0;
}

.contact-section h2 {
    text-align: center;
    color: #1e3c72;
    margin-bottom: 40px;
    font-size: 2rem;
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    max-width: 1000px;
    margin: 0 auto;
}

.contact-card {
    background: white;
    padding: 30px 20px;
    border-radius: 10px;
    text-align: center;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    transition: transform 0.3s ease;
}

.contact-card:hover {
    transform: translateY(-5px);
}

.contact-icon {
    font-size: 2.5rem;
    margin-bottom: 15px;
}

.contact-card h3 {
    color: #1e3c72;
    margin-bottom: 10px;
    font-size: 1.2rem;
}

.contact-card a, .contact-card p {
    color: #666;
    text-decoration: none;
    font-size: 0.95rem;
}

.contact-card a:hover {
    color: #1e3c72;
}

.about-features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

.feature-item {
    text-align: center;
    padding: 20px;
}

.feature-item h3 {
    color: #1e3c72;
    margin-bottom: 10px;
    font-size: 1.2rem;
}

.feature-item p {
    color: #666;
    font-size: 0.95rem;
}

.company-info {
    background: #f8f9fa;
    padding: 100px 0;
}

.company-info h2 {
    text-align: center;
    margin-bottom: 20px;
    color: #2c3e50;
    font-size: 42px;
    font-weight: 700;
}

.about-intro {
    text-align: center;
    color: #7f8c8d;
    font-size: 20px;
    margin-bottom: 60px;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.6;
}

.company-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 40px;
    max-width: 1000px;
    margin: 0 auto 80px;
    padding: 40px;
    background: white;
    border-radius: 15px;
    box-shadow: 0 5px 25px rgba(0,0,0,0.1);
}

.company-stat {
    text-align: center;
}

.company-stat .stat-number {
    display: block;
    font-size: 42px;
    font-weight: bold;
    color: #3498db;
    margin-bottom: 10px;
}

.company-stat .stat-label {
    color: #7f8c8d;
    font-size: 16px;
    font-weight: 500;
}

.about-features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 40px;
    max-width: 1200px;
    margin: 0 auto 80px;
}

.feature-item {
    text-align: center;
    padding: 40px 30px;
    background: white;
    border-radius: 15px;
    box-shadow: 0 5px 25px rgba(0,0,0,0.08);
    transition: transform 0.3s ease;
}

.feature-item:hover {
    transform: translateY(-5px);
}

.company-feature-icon {
    font-size: 48px;
    margin-bottom: 20px;
}

.feature-item h3 {
    color: #2c3e50;
    margin-bottom: 15px;
    font-size: 22px;
    font-weight: 600;
}

.feature-item p {
    color: #7f8c8d;
    font-size: 16px;
    line-height: 1.6;
}

.company-values {
    max-width: 1000px;
    margin: 0 auto;
    text-align: center;
}

.company-values h3 {
    color: #2c3e50;
    margin-bottom: 40px;
    font-size: 32px;
    font-weight: 600;
}

.values-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.value-item {
    padding: 30px;
    background: white;
    border-radius: 10px;
    box-shadow: 0 3px 15px rgba(0,0,0,0.08);
}

.value-item h4 {
    color: #3498db;
    margin-bottom: 15px;
    font-size: 20px;
    font-weight: 600;
}

.value-item p {
    color: #7f8c8d;
    font-size: 16px;
    line-height: 1.6;
}

/* 公司故事区块样式 */
.company-story {
    max-width: 1000px;
    margin: 0 auto 80px;
    text-align: center;
}

.company-story h3 {
    color: #2c3e50;
    margin-bottom: 30px;
    font-size: 32px;
    font-weight: 600;
}

.company-story p {
    color: #7f8c8d;
    font-size: 18px;
    line-height: 1.8;
    margin-bottom: 20px;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

/* 发展历程区块样式 */
.company-milestones {
    max-width: 1200px;
    margin: 0 auto 80px;
    text-align: center;
}

.company-milestones h3 {
    color: #2c3e50;
    margin-bottom: 50px;
    font-size: 32px;
    font-weight: 600;
}

.milestones-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 30px;
}

.milestone-item {
    padding: 30px 20px;
    background: white;
    border-radius: 15px;
    box-shadow: 0 5px 25px rgba(0,0,0,0.08);
    transition: transform 0.3s ease;
}

.milestone-item:hover {
    transform: translateY(-5px);
}

.milestone-year {
    font-size: 28px;
    font-weight: bold;
    color: #3498db;
    margin-bottom: 15px;
}

.milestone-desc {
    color: #7f8c8d;
    font-size: 16px;
    line-height: 1.6;
}

/* 荣誉资质区块样式 */
.company-honors {
    max-width: 1000px;
    margin: 0 auto 80px;
    text-align: center;
}

.company-honors h3 {
    color: #2c3e50;
    margin-bottom: 50px;
    font-size: 32px;
    font-weight: 600;
}

.honors-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
}

.honor-item {
    padding: 40px 30px;
    background: white;
    border-radius: 15px;
    box-shadow: 0 5px 25px rgba(0,0,0,0.08);
    transition: transform 0.3s ease;
}

.honor-item:hover {
    transform: translateY(-5px);
}

.honor-icon {
    font-size: 48px;
    margin-bottom: 20px;
}

.honor-item h4 {
    color: #2c3e50;
    margin-bottom: 15px;
    font-size: 22px;
    font-weight: 600;
}

.honor-item p {
    color: #7f8c8d;
    font-size: 16px;
    line-height: 1.6;
}

/* 合作伙伴区块样式 */
.company-partners {
    max-width: 1200px;
    margin: 0 auto 80px;
    text-align: center;
}

.company-partners h3 {
    color: #2c3e50;
    margin-bottom: 20px;
    font-size: 32px;
    font-weight: 600;
}

.company-partners p {
    color: #7f8c8d;
    font-size: 18px;
    margin-bottom: 50px;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.partners-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 30px;
}

.partner-item {
    padding: 30px 20px;
    background: white;
    border-radius: 10px;
    box-shadow: 0 3px 15px rgba(0,0,0,0.08);
    font-weight: 600;
    color: #2c3e50;
    font-size: 18px;
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.partner-item:hover {
    border-color: #3498db;
    transform: translateY(-3px);
    box-shadow: 0 5px 25px rgba(52, 152, 219, 0.2);
}

/* 学习优势区块样式 */
.learning-benefits {
    background: #f8f9fa;
    padding: 80px 0;
}

.learning-benefits h2 {
    text-align: center;
    color: #2c3e50;
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 20px;
}

.learning-benefits .section-desc {
    text-align: center;
    color: #7f8c8d;
    font-size: 18px;
    margin-bottom: 60px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.benefits-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    max-width: 1200px;
    margin: 0 auto;
}

.benefit-item {
    text-align: center;
    padding: 40px 30px;
    background: white;
    border-radius: 15px;
    box-shadow: 0 5px 25px rgba(0,0,0,0.08);
    transition: transform 0.3s ease;
}

.benefit-item:hover {
    transform: translateY(-5px);
}

.benefit-icon {
    font-size: 48px;
    margin-bottom: 20px;
}

.benefit-item h3 {
    color: #2c3e50;
    margin-bottom: 15px;
    font-size: 22px;
    font-weight: 600;
}

.benefit-item p {
    color: #7f8c8d;
    font-size: 16px;
    line-height: 1.6;
}

/* 企业培训区块样式 */
.enterprise-training {
    padding: 80px 0;
    background: white;
}

.enterprise-training h2 {
    text-align: center;
    color: #2c3e50;
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 20px;
}

.enterprise-training .section-desc {
    text-align: center;
    color: #7f8c8d;
    font-size: 18px;
    margin-bottom: 60px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.enterprise-features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 40px;
    max-width: 1000px;
    margin: 0 auto 60px;
}

.enterprise-item {
    text-align: center;
    padding: 40px 30px;
    background: #f8f9fa;
    border-radius: 15px;
    transition: transform 0.3s ease;
}

.enterprise-item:hover {
    transform: translateY(-5px);
}

.enterprise-icon {
    font-size: 48px;
    margin-bottom: 20px;
}

.enterprise-item h3 {
    color: #2c3e50;
    margin-bottom: 15px;
    font-size: 22px;
    font-weight: 600;
}

.enterprise-item p {
    color: #7f8c8d;
    font-size: 16px;
    line-height: 1.6;
}

.enterprise-cta {
    text-align: center;
    background: #3498db;
    color: white;
    padding: 40px;
    border-radius: 15px;
    max-width: 800px;
    margin: 0 auto;
}

.enterprise-cta p {
    font-size: 18px;
    margin-bottom: 20px;
    font-weight: 500;
}

.enterprise-cta .btn {
    background: white;
    color: #3498db;
    border: 2px solid white;
}

.enterprise-cta .btn:hover {
    background: transparent;
    color: white;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .benefits-grid,
    .enterprise-features {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    
    .benefit-item,
    .enterprise-item {
        padding: 30px 20px;
    }
    
    .learning-benefits,
    .enterprise-training {
        padding: 60px 0;
    }
    
    .learning-benefits h2,
    .enterprise-training h2 {
        font-size: 28px;
    }
}

.site-header h1 {
    font-size: 2.2rem;
    margin-bottom: 8px;
    font-weight: 600;
}

.tagline {
    font-size: 1.1rem;
    opacity: 0.9;
    margin: 0;
}

.course-company-info {
    background: white;
    padding: 40px 20px;
    text-align: center;
}

.course-company-info h2 {
    color: #1e3c72;
    margin-bottom: 20px;
}

.course-company-info p {
    max-width: 600px;
    margin: 0 auto;
    color: #555;
    line-height: 1.8;
}

.course-showcase {
    padding: 80px 0;
    background: #f8f9fa;
}

.course-showcase h2 {
    text-align: center;
    margin-bottom: 15px;
    color: #2c3e50;
    font-size: 36px;
}

.section-desc {
    text-align: center;
    color: #7f8c8d;
    margin-bottom: 50px;
    font-size: 18px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.course-categories {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-bottom: 60px;
}

.category-card {
    background: white;
    border-radius: 10px;
    padding: 30px;
    box-shadow: 0 3px 15px rgba(0,0,0,0.08);
    transition: transform 0.3s ease;
}

.category-card:hover {
    transform: translateY(-5px);
}

.category-icon {
    font-size: 48px;
    margin-bottom: 20px;
    text-align: center;
}

.category-card h3 {
    color: #2c3e50;
    margin-bottom: 15px;
    font-size: 22px;
    text-align: center;
}

.category-card > p {
    color: #7f8c8d;
    text-align: center;
    margin-bottom: 25px;
    font-size: 16px;
}

.course-list-mini {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.mini-course {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 15px;
    background: #f8f9fa;
    border-radius: 5px;
    transition: background 0.3s ease;
}

.mini-course:hover {
    background: #e8f4f8;
}

.course-name {
    color: #2c3e50;
    font-weight: 500;
}

.mini-course-price {
    color: #3498db;
    font-weight: bold;
}

.featured-course {
    max-width: 800px;
    margin: 0 auto;
}

.featured-course h3 {
    text-align: center;
    margin-bottom: 30px;
    color: #2c3e50;
    font-size: 28px;
}

.course-card {
    background: white;
    border-radius: 10px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.1);
    padding: 40px;
    position: relative;
}

.course-card.featured {
    border: 2px solid #3498db;
}

.course-badge {
    position: absolute;
    top: -10px;
    right: 20px;
    background: #e74c3c;
    color: white;
    padding: 5px 15px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: bold;
}

.course-card h4 {
    color: #2c3e50;
    margin-bottom: 15px;
    font-size: 24px;
}

.course-desc {
    color: #7f8c8d;
    margin-bottom: 30px;
    font-size: 16px;
    line-height: 1.6;
}

.course-preview {
    margin-bottom: 30px;
}

.course-preview h5 {
    color: #2c3e50;
    margin-bottom: 15px;
    font-size: 18px;
}

.video-container {
    position: relative;
    padding-bottom: 56.25%;
    height: 0;
    overflow: hidden;
    margin-bottom: 10px;
}

.video-container video {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border-radius: 8px;
}

.price-section {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid #eee;
}

.price {
    font-size: 36px;
    color: #e74c3c;
    font-weight: bold;
    margin-bottom: 5px;
}

.price-note {
    color: #7f8c8d;
    margin-bottom: 20px;
}

.course-action-buttons {
    display: flex;
    gap: 15px;
    justify-content: center;
}

.course-btn {
    padding: 15px 30px;
    border-radius: 5px;
    text-decoration: none;
    font-weight: bold;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
    display: inline-block;
}

.course-primary-btn {
    background: #3498db;
    color: white;
}

.course-primary-btn:hover {
    background: #2980b9;
}

.course-secondary-btn {
    background: white;
    color: #3498db;
    border: 2px solid #3498db;
}

.course-secondary-btn:hover {
    background: #3498db;
    color: white;
}

.contact-section {
    background: white;
    padding: 40px 20px;
    text-align: center;
}

.contact-section h2 {
    color: #1e3c72;
    margin-bottom: 30px;
}

.contact-info {
    max-width: 400px;
    margin: 0 auto;
}

.contact-item {
    margin-bottom: 15px;
    color: #555;
}

.contact-item a {
    color: #1e3c72;
    text-decoration: none;
}

.contact-item a:hover {
    text-decoration: underline;
}

/* 课程详情页面特有样式 */
.course-detail {
    background: white;
    border-radius: 15px;
    padding: 30px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    margin: 20px 0;
}

.course-header-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
    align-items: flex-start;
}

.course-main-content {
    min-width: 0; /* 防止内容溢出 */
}

.course-sidebar {
    min-width: 280px;
}

.price-box {
    background: linear-gradient(135deg, #f8f9ff 0%, #ffffff 100%);
    border: 1px solid #e0e6f8;
    border-radius: 12px;
    padding: 30px;
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.15);
    position: sticky;
    top: 120px;
    width: 100%;
    box-sizing: border-box;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.price-box:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 35px rgba(102, 126, 234, 0.2);
}

.price-box .course-price {
    font-size: 2.5rem;
    font-weight: bold;
    color: #d9534f;
    margin: 0 0 10px;
    text-align: center;
}

.price-box .original-price {
    font-size: 1rem;
    color: #888;
    text-decoration: line-through;
    margin-left: 10px;
}

.price-box .buy-btn {
    width: 100%;
    padding: 15px;
    font-size: 1.2rem;
    margin: 15px 0 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.price-box .buy-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
}

.price-box ul {
    list-style: none;
    padding: 0;
    margin-top: 20px;
    color: #555;
}

.price-box ul li {
    margin-bottom: 10px;
    background: url('data:image/svg+xml;charset=UTF-8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="%2328a745" width="18px" height="18px"><path d="M0 0h24v24H0z" fill="none"/><path d="M9 16.17L4.83 12l-1.42 1.41L9 19 21 7l-1.41-1.41z"/></svg>') no-repeat left center;
    padding-left: 25px;
    line-height: 1.5;
}

.video-preview-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
}

.video-preview-item video {
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.video-preview-item p {
    text-align: center;
    margin-top: 8px;
    font-size: 0.9rem;
    color: #666;
}

/* 支付页面特有样式 */
.terms-agreement {
    margin: 20px 0;
    text-align: center;
    font-size: 0.9rem;
    color: #666;
}

.terms-agreement input {
    margin-right: 5px;
    vertical-align: middle;
}

.terms-agreement a {
    color: #667eea;
    text-decoration: none;
}

.terms-agreement a:hover {
    text-decoration: underline;
}

.confirm-btn:disabled {
    background: #ccc;
    cursor: not-allowed;
}

@media (max-width: 768px) {
    .course-header-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    
    .course-sidebar {
        min-width: auto;
        order: 2; /* 确保购买区域在内容下方 */
    }
    
    .course-main-content {
        order: 1; /* 确保内容在上方 */
    }
    
    .price-box {
        position: static;
        margin-top: 20px;
        padding: 25px 20px;
    }
    
    .price-box .course-price {
        font-size: 2.2rem;
    }
    
    .price-box .buy-btn {
        padding: 15px;
        font-size: 1.2rem;
    }
}

@media (max-width: 480px) {
    .course-detail {
        padding: 20px;
        margin: 10px 0;
    }
    
    .course-header-grid {
        gap: 20px;
        margin-bottom: 30px;
    }
    
    .price-box {
        padding: 20px 15px;
    }
    
    .price-box .course-price {
        font-size: 2rem;
    }
    
    .price-box ul li {
        font-size: 0.9rem;
    }
}

/* 商品信息样式 */
.product-info {
    background: #f8f9fa;
    padding: 25px;
    border-radius: 10px;
    margin-bottom: 30px;
}

.product-info h2 {
    color: #1e3c72;
    margin-bottom: 20px;
}

.info-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
}

.info-item {
    padding: 10px;
    background: white;
    border-radius: 8px;
    font-size: 0.95rem;
}

@media (max-width: 480px) {
    .info-grid {
        grid-template-columns: 1fr;
    }
}

/* 学习收获样式 */
.learning-outcomes {
    background: #e8f4fd;
    padding: 20px;
    border-radius: 10px;
    margin: 20px 0;
}

.learning-outcomes li {
    margin-bottom: 8px;
    color: #2c5282;
}

/* 适用人群列表样式 */
.target-users-list {
    background: #f0f9ff;
    padding: 20px;
    border-radius: 10px;
    margin: 20px 0;
}

.target-users-list li {
    margin-bottom: 8px;
    color: #0369a1;
}

/* 配套服务样式 */
.service-details {
    background: #fefce8;
    padding: 20px;
    border-radius: 10px;
    margin: 20px 0;
}

.service-item {
    margin-bottom: 10px;
    color: #92400e;
}

.service-item:last-child {
    margin-bottom: 0;
}

/* 支付页面新增样式 */
.payment-company-info {
    background: #f8f9fa;
    padding: 25px;
    border-radius: 10px;
    margin-bottom: 30px;
}

.payment-company-info h3 {
    color: #1e3c72;
    margin-bottom: 15px;
}

.company-details p {
    margin-bottom: 8px;
    color: #555;
}

.product-details {
    background: #f8f9fa;
    padding: 20px;
    border-radius: 10px;
    margin-bottom: 20px;
}

.product-name {
    font-size: 1.2rem;
    font-weight: bold;
    color: #1e3c72;
    margin-bottom: 10px;
}

.product-specs p {
    margin-bottom: 5px;
    color: #555;
    font-size: 0.95rem;
}

.purchase-notes {
    background: #fff3cd;
    padding: 20px;
    border-radius: 10px;
    margin-bottom: 30px;
}

.purchase-notes h3 {
    color: #856404;
    margin-bottom: 15px;
}

.notes-list {
    color: #856404;
}

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

.payment-options {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.payment-option label {
    display: flex;
    align-items: center;
    padding: 15px;
    border: 2px solid #eee;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.payment-option input[type="radio"] {
    margin-right: 15px;
}

.payment-option label:hover {
    border-color: #1e3c72;
    background: #f8f9fa;
}

.payment-option input[type="radio"]:checked + label {
    border-color: #1e3c72;
    background: #f0f8ff;
}

.payment-course-price {
    font-size: 1.5rem;
    font-weight: bold;
    color: #e74c3c;
    margin-bottom: 5px;
}

.price-description {
    color: #666;
    font-size: 0.9rem;
}



.preview-info {
    color: #666;
    font-size: 0.9rem;
    margin-top: 10px;
}

.spec-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin: 30px 0;
}

.spec-item {
    text-align: center;
    padding: 20px;
    background: #f8f9fa;
    border-radius: 10px;
    transition: transform 0.3s ease;
}

.spec-item:hover {
    transform: translateY(-2px);
}

.spec-item i {
    display: block;
    font-size: 2rem;
    margin-bottom: 10px;
    color: #1e3c72;
}

.spec-item strong {
    display: block;
    color: #1e3c72;
    font-size: 1.1rem;
    margin-bottom: 5px;
}

.spec-item span {
    color: #666;
    font-size: 0.9rem;
}

.course-outline {
    margin: 40px 0;
}

.course-outline h4 {
    color: #1e3c72;
    margin-bottom: 20px;
    text-align: center;
    font-size: 1.3rem;
}

.outline-grid {
    display: grid;
    gap: 15px;
}

.outline-item {
    display: grid;
    grid-template-columns: 80px 1fr 80px;
    align-items: center;
    padding: 15px;
    background: #f8f9fa;
    border-radius: 8px;
    border-left: 4px solid #1e3c72;
}

.outline-item .chapter {
    font-weight: 600;
    color: #1e3c72;
}

.outline-item .title {
    font-weight: 500;
    color: #333;
}

.outline-item .videos {
    color: #666;
    font-size: 0.9rem;
    text-align: right;
}

.user-reviews {
    margin: 40px 0;
}

.user-reviews h4 {
    color: #1e3c72;
    margin-bottom: 20px;
    text-align: center;
    font-size: 1.3rem;
}

.review-list {
    display: grid;
    gap: 20px;
}

.review-item {
    display: flex;
    gap: 15px;
    padding: 20px;
    background: #f8f9fa;
    border-radius: 10px;
}

.review-avatar {
    width: 50px;
    height: 50px;
    background: #1e3c72;
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    flex-shrink: 0;
}

.review-content strong {
    color: #1e3c72;
    display: block;
    margin-bottom: 5px;
}

.stars {
    color: #ffc107;
    margin-bottom: 8px;
}

.review-content p {
    color: #555;
    margin: 0;
    font-size: 0.95rem;
    line-height: 1.5;
}

.course-features {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    justify-content: center;
    margin: 30px 0;
}

.course-features span {
    background: #e8f2ff;
    color: #1e3c72;
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 500;
}

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

.price-note {
    color: #666;
    font-size: 0.9rem;
    margin-top: 5px;
}

.detail-action-buttons {
    display: flex;
    gap: 15px;
    justify-content: center;
    flex-wrap: wrap;
}

.detail-secondary-btn {
    background: transparent;
    color: #1e3c72;
    border: 2px solid #1e3c72;
}

.detail-secondary-btn:hover {
    background: #1e3c72;
    color: white;
}

@media (max-width: 768px) {
    .outline-item {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 5px;
    }
    
    .outline-item .videos {
        text-align: center;
    }
    
    .review-item {
        flex-direction: column;
        text-align: center;
    }
    
    .action-buttons {
        flex-direction: column;
        align-items: center;
    }
}

/* 关于我们页面样式 */
.about-hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 60px 20px;
    text-align: center;
    margin-bottom: 50px;
}

.about-hero h1 {
    font-size: 2.8rem;
    margin-bottom: 15px;
    font-weight: 700;
}

.about-hero p {
    font-size: 1.2rem;
    opacity: 0.9;
    max-width: 600px;
    margin: 0 auto;
}

.about-content {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 20px;
}

.about-section {
    background: white;
    border-radius: 15px;
    padding: 40px;
    margin-bottom: 30px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.08);
}

.about-section h2 {
    color: #2c3e50;
    font-size: 2rem;
    margin-bottom: 50px;
    text-align: center;
    position: relative;
}


.about-section h2::after {
    content: none;
}

.about-section p {
    color: #555;
    line-height: 1.8;
    margin-bottom: 20px;
    font-size: 1.1rem;
    text-align: left;
    padding-left: 20px;
}

.about-section ul {
    list-style: none;
    padding: 0;
    text-align: left;
}

.about-section ul li {
    padding: 10px 0;
    padding-left: 25px;
    position: relative;
    color: #555;
    font-size: 1.1rem;
}

.about-section ul li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: #667eea;
    font-weight: bold;
    font-size: 1.2rem;
}

/* 团队展示 */
.team-section {
    background: #f8f9fa;
    padding: 50px 20px;
    margin: 40px 0;
}

.team-section h2 {
    text-align: center;
    color: #2c3e50;
    font-size: 2.2rem;
    margin-bottom: 40px;
}

.team-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    max-width: 1000px;
    margin: 0 auto;
}

.team-member {
    background: white;
    border-radius: 15px;
    padding: 30px;
    text-align: center;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    transition: transform 0.3s ease;
}

.team-member:hover {
    transform: translateY(-5px);
}

.member-avatar {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 50%;
    margin: 0 auto 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 2rem;
    font-weight: bold;
    object-fit: cover;
    border: 3px solid #fff;
    box-shadow: 0 2px 8px rgba(0,0,0,0.15);
}

.member-name {
    font-size: 1.3rem;
    color: #2c3e50;
    margin-bottom: 8px;
    font-weight: 600;
}

.member-title {
    color: #667eea;
    font-size: 1rem;
    margin-bottom: 15px;
}

.member-desc {
    color: #666;
    font-size: 0.9rem;
    line-height: 1.5;
}

/* 企业资质 */
.certificates-section {
    background: white;
    padding: 50px 20px;
    margin: 40px 0;
}

.certificates-section h2 {
    text-align: center;
    color: #2c3e50;
    font-size: 2.2rem;
    margin-bottom: 40px;
}

.certificates-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 25px;
    max-width: 800px;
    margin: 0 auto;
}

.certificate-item {
    background: #f8f9fa;
    border-radius: 12px;
    padding: 25px;
    text-align: center;
    border: 2px solid #e9ecef;
    transition: all 0.3s ease;
}

.certificate-item:hover {
    border-color: #667eea;
    background: #f0f4ff;
}

.certificate-icon {
    font-size: 2.5rem;
    color: #667eea;
    margin-bottom: 15px;
}

.certificate-title {
    font-size: 1.1rem;
    color: #2c3e50;
    font-weight: 600;
    margin-bottom: 8px;
}

.certificate-desc {
    color: #666;
    font-size: 0.9rem;
}

/* 页脚样式 */
.footer-wrapper {
    background: #2c3e50;
    color: white;
    padding: 40px 20px;
    text-align: center;
    width: 100%;
    margin: 0;
    display: flex;
    justify-content: center;
    align-items: center;
}

.foot2 {
    max-width: 600px;
    width: 100%;
    margin: 0 auto;
    text-align: center;
    padding: 0;
}

.footer-wrapper p {
    margin: 8px 0;
    font-size: 14px;
    line-height: 1.5;
    text-align: center;
}

.footer-wrapper a {
    color: #bdc3c7;
    text-decoration: none;
}

.footer-wrapper a:hover {
    color: #ffffff;
    text-decoration: underline;
}

/* 响应式 */
@media (max-width: 768px) {
    .about-hero {
        padding: 40px 20px;
    }
    
    .about-hero h1 {
        font-size: 2.2rem;
    }
    
    .about-section {
        padding: 25px;
        margin: 20px 10px;
    }
    
    .about-section h2 {
        font-size: 1.6rem;
    }
    
    .team-grid,
    .certificates-grid {
        grid-template-columns: 1fr;
        padding: 0 10px;
    }
}

/* 售后支持页面样式 - 简洁版 */
.page-header {
    background: #f8f9fa;
    padding: 40px 0;
    text-align: center;
    border-bottom: 1px solid #e9ecef;
}

.page-header h1 {
    font-size: 2rem;
    color: #333;
    margin: 0;
}

.content-section {
    background: white;
    padding: 30px;
    margin-bottom: 20px;
    border: 1px solid #e9ecef;
    border-radius: 4px;
}

.content-section h2 {
    font-size: 1.4rem;
    color: #333;
    margin-bottom: 15px;
    padding-bottom: 10px;
    border-bottom: 1px solid #e9ecef;
}

.important-note {
    background: #fff5f5;
    border: 1px solid #ffe0e0;
    padding: 15px;
    border-radius: 4px;
    margin: 15px 0;
}

.content-section ol,
.content-section ul {
    margin: 15px 0;
    padding-left: 25px;
}

.content-section li {
    margin-bottom: 8px;
    line-height: 1.6;
}

@media (max-width: 768px) {
    .page-header {
        padding: 30px 20px;
    }
    
    .page-header h1 {
        font-size: 1.8rem;
    }
    
    .content-section {
        padding: 20px;
        margin-bottom: 15px;
    }
    
    .content-section h2 {
        font-size: 1.3rem;
    }
}

/* 新增：学习流程模块样式 */
.learning-process-section {
    padding: 60px 20px;
    background: white;
}

.process-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 40px;
    max-width: 1200px;
    margin: 0 auto;
    text-align: center;
}

.process-step {
    position: relative;
}

.step-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    font-size: 2rem;
    font-weight: bold;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
}

.process-step h3 {
    font-size: 1.4rem;
    margin-bottom: 10px;
    color: #333;
}

.process-step p {
    color: #666;
    line-height: 1.6;
}

/* 新增：学员评价模块样式 */
.testimonial-section {
    padding: 60px 20px;
    background: #f5f5f5;
}

.testimonial-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    max-width: 1200px;
    margin: 0 auto;
}

.testimonial-card {
    background: white;
    padding: 30px;
    border-radius: 15px;
    box-shadow: 0 8px 25px rgba(0,0,0,0.08);
    display: flex;
    flex-direction: column;
}

.testimonial-text {
    color: #555;
    font-size: 1.05rem;
    line-height: 1.7;
    margin-bottom: 25px;
    flex-grow: 1;
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: 15px;
    border-top: 1px solid #eee;
    padding-top: 20px;
}

.author-avatar {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid #667eea;
}

.author-name {
    font-weight: bold;
    color: #333;
}

.author-company {
    color: #777;
    font-size: 0.9rem;
}

/* 新增：职场痛点模块样式 */
.pain-points-section {
    padding: 60px 20px;
    background: #f8f9fa;
}

.points-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    max-width: 1200px;
    margin: 0 auto;
}

.point-card-enhanced {
    background: white;
    border-radius: 15px;
    box-shadow: 0 8px 25px rgba(0,0,0,0.08);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    overflow: hidden; /* Ensures the border-radius is respected by children */
    display: flex;
    flex-direction: column;
}

.point-card-enhanced:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 35px rgba(0,0,0,0.12);
}

.problem-part {
    padding: 30px;
    background: #ffffff; /* Top part remains white */
    flex-grow: 1; /* Allows this part to take up available space */
    display: flex;
    align-items: center;
    gap: 20px;
}

.point-icon {
    font-family: 'Oswald', sans-serif;
    font-size: 5rem;
    font-weight: 700;
    font-style: italic;
    color: #667eea;
    opacity: 0.5;
    transition: opacity 0.3s ease;
}

.point-card-enhanced:hover .point-icon {
    opacity: 0.8;
}

.problem-part h3 {
    font-size: 1.3rem;
    color: #333;
    margin-bottom: 15px;
}

.problem-part p {
    color: #666;
    line-height: 1.6;
}

.solution-part {
    background: linear-gradient(135deg, #f0f4ff 0%, #e6e9ff 100%);
    padding: 20px;
    text-align: center;
    border-top: 1px solid #dde2f0;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
}

.solution-icon {
    font-size: 1.5rem;
    color: #667eea;
}

.solution-part p {
    margin: 0;
    color: #4a5a94;
    font-size: 1rem;
    line-height: 1.5;
}

.solution-part p strong {
    color: #3d4a81;
}

/* course.html price box enhancement */
.price-box .price-display {
    text-align: center;
    margin-bottom: 5px;
}

.price-box .current-price {
    font-size: 2.5rem;
    font-weight: bold;
    color: #d9534f;
}

.price-box .original-price {
    font-size: 1rem;
    color: #888;
    text-decoration: line-through;
    margin-left: 10px;
}

.price-box .discount-badge {
    display: block;
    width: -moz-fit-content;
    width: fit-content;
    margin: 0 auto 15px; /* center the badge */
}