/* 苹果风格色彩方案 */
:root {
    --primary-color: #1D1D1F;    /* 主色调 - 系统灰 */
    --secondary-color: #F5F5F7;  /* 辅助色 - 浅灰 */
    --accent-color: #007AFF;     /* 强调色 - 系统蓝 */
    --bg-light: #FFFFFF;         /* 纯白背景 */
    --text-primary: #1D1D1F;     /* 主要文字色 */
    --text-secondary: #86868B;   /* 次要文字色 */
    --success-color: #34C759;    /* 成功色 - 系统绿 */
    
    /* 字体规范 */
    --font-display: 'SF Pro Display', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-text: 'SF Pro Text', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

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

body {
    font-family: var(--font-text);
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-light);
    overflow-x: hidden;
}

/* Liquid Glass效果 */
.glass-nav {
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
}

.glass-card {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 20px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
}

.glass-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 16px 64px rgba(0, 0, 0, 0.15);
}

.glass-btn {
    background: rgba(0, 122, 255, 0.9);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(0, 122, 255, 0.3);
    border-radius: 12px;
    color: white;
    font-weight: 500;
    transition: all 0.3s ease;
}

.glass-btn:hover {
    background: rgba(0, 122, 255, 1);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 122, 255, 0.3);
    color: white;
}

.glass-modal {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(30px);
    -webkit-backdrop-filter: blur(30px);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 20px;
    box-shadow: 0 16px 64px rgba(0, 0, 0, 0.2);
}

/* 导航栏 */
.navbar-brand {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary) !important;
}

.nav-link {
    font-weight: 500;
    color: var(--text-primary) !important;
    transition: color 0.3s ease;
}

.nav-link:hover {
    color: var(--accent-color) !important;
}

/* 页面标题 */
.page-header {
    background: linear-gradient(135deg, 
        rgba(255, 255, 255, 0.1) 0%, 
        rgba(255, 255, 255, 0.05) 100%);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    padding: 120px 0 80px;
    margin-top: 76px;
}

.page-title {
    font-size: 3rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.page-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 0;
}

/* 英雄区域 */
.hero-section {
    background: linear-gradient(135deg, 
        rgba(255, 255, 255, 0.1) 0%, 
        rgba(255, 255, 255, 0.05) 100%);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    min-height: 100vh;
    display: flex;
    align-items: center;
}

.hero-title {
    font-family: var(--font-display);
    font-size: 3.5rem;
    font-weight: 700;
    line-height: 1.2;
    color: var(--text-primary);
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.text-accent {
    color: var(--accent-color);
}

.hero-image-container {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
}

.floating-card {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-radius: 24px;
    padding: 20px;
    box-shadow: 0 16px 64px rgba(0, 0, 0, 0.1);
    animation: float 6s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-20px); }
}

/* 章节标题 */
.section-title {
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: 3rem;
}

/* 课程卡片 */
.course-card {
    overflow: hidden;
    transition: all 0.3s ease;
}

.course-image-container {
    position: relative;
    overflow: hidden;
    border-radius: 16px 16px 0 0;
}

.course-image {
    width: 100%;
    height: 250px;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.course-card:hover .course-image {
    transform: scale(1.05);
}

.course-badge {
    position: absolute;
    top: 15px;
    right: 15px;
}

.instructor-avatar {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid var(--bg-light);
}

.instructor-name {
    font-weight: 600;
    color: var(--text-primary);
}

.course-title {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
}

.course-description {
    color: var(--text-secondary);
    line-height: 1.6;
}

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

.feature-item {
    display: flex;
    align-items: center;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

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

.price-current {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent-color);
}

/* 统计数据 */
.stat-item {
    padding: 20px;
    background: rgba(255, 255, 255, 0.8);
    border-radius: 16px;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.stat-number {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0;
}

.stat-label {
    color: var(--text-secondary);
    margin-bottom: 0;
}

/* 关于我们图片 */
.about-image-container {
    position: relative;
    display: flex;
    justify-content: center;
}

.about-image-container img {
    max-width: 80%;
    box-shadow: 0 16px 64px rgba(0, 0, 0, 0.1);
}

/* 页脚 */
footer {
    background-color: var(--primary-color) !important;
}

footer h5 {
    color: var(--bg-light);
    font-weight: 600;
}

footer p, footer li {
    color: rgba(255, 255, 255, 0.8);
}

footer a:hover {
    color: var(--accent-color) !important;
}

/* 购买弹窗内容 */
.modal-course-header {
    text-align: center;
    margin-bottom: 2rem;
}

.modal-course-title {
    font-family: var(--font-display);
    font-size: 1.75rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.modal-course-price {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 700;
    color: var(--accent-color);
}

.course-outline {
    background: var(--secondary-color);
    border-radius: 16px;
    padding: 1.5rem;
    margin-bottom: 2rem;
}

.course-outline h6 {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.course-day {
    display: flex;
    align-items: flex-start;
    margin-bottom: 1rem;
    padding: 0.75rem;
    background: var(--bg-light);
    border-radius: 12px;
}

.day-number {
    background: var(--accent-color);
    color: white;
    width: 30px;
    height: 30px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.875rem;
    margin-right: 1rem;
    flex-shrink: 0;
}

.day-content h6 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.day-content p {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 0;
}

.instructor-info {
    display: flex;
    align-items: center;
    background: var(--secondary-color);
    border-radius: 16px;
    padding: 1.5rem;
    margin-bottom: 2rem;
}

.instructor-info img {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    object-fit: cover;
    margin-right: 1rem;
}

.instructor-details h6 {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.instructor-details p {
    color: var(--text-secondary);
    margin-bottom: 0;
}

.purchase-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

.btn-purchase {
    background: var(--accent-color);
    border: none;
    color: white;
    padding: 12px 30px;
    border-radius: 12px;
    font-weight: 600;
    transition: all 0.3s ease;
}

.btn-purchase:hover {
    background: #0056CC;
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 122, 255, 0.3);
    color: white;
}

/* 支付弹窗样式 */
.payment-option {
    display: block;
    margin-bottom: 10px;
    cursor: pointer;
}

.payment-option input[type="radio"] {
    display: none;
}

.payment-method-card {
    display: flex;
    align-items: center;
    padding: 15px;
    border: 2px solid #e9ecef;
    border-radius: 10px;
    transition: all 0.3s ease;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
}

.payment-method-card:hover {
    border-color: #007bff;
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(0, 123, 255, 0.1);
}

.payment-option input[type="radio"]:checked + .payment-method-card {
    border-color: #007bff;
    background: rgba(0, 123, 255, 0.1);
    box-shadow: 0 4px 15px rgba(0, 123, 255, 0.2);
}

.payment-method-card i {
    font-size: 1.5rem;
    margin-right: 10px;
    width: 30px;
    text-align: center;
}

.payment-method-card span {
    font-weight: 500;
    color: #333;
}

/* 二维码样式 */
.qr-code-section {
    text-align: center;
    padding: 20px;
    background: rgba(255, 255, 255, 0.9);
    border-radius: 15px;
    margin: 20px 0;
}

.qr-code-container {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.qr-code-wrapper {
    position: relative;
    margin-bottom: 15px;
}

#qrCodeCanvas {
    border-radius: 10px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.qr-code-fallback {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    width: 200px;
    height: 200px;
    border: 2px dashed #dee2e6;
    border-radius: 10px;
    background: rgba(248, 249, 250, 0.8);
}

.qr-code-info {
    max-width: 300px;
}

.payment-status {
    padding: 10px;
    border-radius: 8px;
    margin-top: 10px;
}

.status-waiting {
    color: #6c757d;
    display: flex;
    align-items: center;
    justify-content: center;
}

.status-success {
    color: #198754;
    background: rgba(25, 135, 84, 0.1);
}

.status-error {
    color: #dc3545;
    background: rgba(220, 53, 69, 0.1);
}

.status-warning {
    color: #fd7e14;
    background: rgba(253, 126, 20, 0.1);
}

.status-info {
    color: #0dcaf0;
    background: rgba(13, 202, 240, 0.1);
}

/* 订单信息样式 */
.order-info {
    background: rgba(248, 249, 250, 0.8);
    padding: 20px;
    border-radius: 10px;
    border-left: 4px solid #007bff;
}

.order-details h5 {
    color: #333;
    margin-bottom: 5px;
}

.order-details .text-muted {
    font-size: 0.9rem;
}

/* 支付说明样式 */
.payment-notice {
    background: rgba(248, 249, 250, 0.6);
    padding: 15px;
    border-radius: 8px;
    margin-top: 20px;
}

.payment-notice h6 {
    color: #495057;
    margin-bottom: 10px;
}

.payment-notice ul li {
    padding: 2px 0;
    font-size: 0.9rem;
}

/* 支付弹窗动画 */
.modal.fade .modal-dialog {
    transform: scale(0.8);
    transition: transform 0.3s ease-out;
}

.modal.show .modal-dialog {
    transform: scale(1);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2.5rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .course-features {
        flex-direction: column;
    }
    
    .purchase-actions {
        flex-direction: column;
    }
    
    .instructor-info {
        flex-direction: column;
        text-align: center;
    }
    
    .instructor-info img {
        margin-right: 0;
        margin-bottom: 1rem;
    }
    
    .payment-method-card {
        padding: 12px;
    }
    
    .payment-method-card i {
        font-size: 1.3rem;
    }
    
    .qr-code-section {
        padding: 15px;
    }
    
    #qrCodeCanvas,
    .qr-code-fallback {
        width: 150px;
        height: 150px;
    }
    
    .modal-dialog {
        margin: 10px;
    }
}

/* 平滑滚动 */
html {
    scroll-behavior: smooth;
}

/* 按钮动画 */
.btn {
    transition: all 0.3s ease;
}

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

/* 加载动画 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in-up {
    animation: fadeInUp 0.6s ease-out;
}

/* 课程详情页面样式 */
.course-detail-main {
    padding-top: 100px;
    padding-bottom: 60px;
    background: var(--bg-light);
}

.course-header {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-radius: 20px;
    padding: 40px;
    margin-bottom: 40px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.course-title {
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.course-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.course-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 2rem;
    align-items: center;
}

.course-meta span {
    display: flex;
    align-items: center;
    color: var(--text-secondary);
    font-weight: 500;
}

.course-meta .price {
    color: var(--accent-color);
    font-size: 1.5rem;
    font-weight: 700;
}

.course-actions {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.course-section {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-radius: 20px;
    padding: 30px;
    margin-bottom: 30px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.course-section h3 {
    font-family: var(--font-display);
    font-size: 1.75rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 1.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--secondary-color);
}

.course-description {
    color: var(--text-primary);
    line-height: 1.8;
    font-size: 1.1rem;
}

.course-curriculum {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.instructor-info {
    display: flex;
    align-items: flex-start;
    gap: 1.5rem;
}

.instructor-avatar {
    flex-shrink: 0;
}

.instructor-avatar img {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    object-fit: cover;
    border: 3px solid var(--secondary-color);
}

.instructor-details h4 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.instructor-details p {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 0;
}

.purchase-card {
    position: sticky;
    top: 120px;
}

.purchase-card .card {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 20px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
}

.purchase-card .card:hover {
    transform: translateY(-5px);
    box-shadow: 0 16px 64px rgba(0, 0, 0, 0.15);
}

.course-features {
    list-style: none;
    padding: 0;
    margin: 1.5rem 0;
}

.course-features li {
    padding: 0.5rem 0;
    color: var(--text-primary);
    font-weight: 500;
}

.price-info {
    text-align: center;
    padding: 1.5rem 0;
    border-top: 1px solid var(--secondary-color);
    border-bottom: 1px solid var(--secondary-color);
    margin: 1.5rem 0;
}

.current-price {
    font-size: 2rem;
    font-weight: 700;
    color: var(--accent-color);
    margin-bottom: 0.5rem;
}

.original-price {
    font-size: 1.2rem;
    color: var(--text-secondary);
    text-decoration: line-through;
}

/* 个人中心样式 */
.user-center-main {
    padding-top: 76px;
    min-height: 100vh;
    background: var(--bg-light);
}

.user-sidebar {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 20px;
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
}

.user-profile {
    text-align: center;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--secondary-color);
    margin-bottom: 2rem;
}

.user-avatar {
    margin-bottom: 1rem;
    color: var(--accent-color);
}

.user-profile h5 {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.user-profile p {
    color: var(--text-secondary);
    margin-bottom: 0;
}

.user-nav .nav-pills .nav-link {
    color: var(--text-primary);
    background: transparent;
    border-radius: 12px;
    padding: 0.75rem 1rem;
    margin-bottom: 0.5rem;
    transition: all 0.3s ease;
    border: none;
}

.user-nav .nav-pills .nav-link:hover {
    background: rgba(0, 122, 255, 0.1);
    color: var(--accent-color);
}

.user-nav .nav-pills .nav-link.active {
    background: var(--accent-color);
    color: white;
}

.tab-content {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 20px;
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    display: none;
}

.tab-content.active {
    display: block;
}

.tab-content h3 {
    color: var(--text-primary);
    font-weight: 600;
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--secondary-color);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: rgba(255, 255, 255, 0.8);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 16px;
    padding: 1.5rem;
    text-align: center;
    transition: all 0.3s ease;
}

.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
}

.stat-card .stat-icon {
    font-size: 2rem;
    color: var(--accent-color);
    margin-bottom: 1rem;
}

.stat-card .stat-number {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

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

.course-item {
    background: rgba(255, 255, 255, 0.8);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 16px;
    padding: 1.5rem;
    margin-bottom: 1rem;
    transition: all 0.3s ease;
}

.course-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
}

.course-item h5 {
    color: var(--text-primary);
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.course-item p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

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

.progress-bar-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--accent-color), var(--success-color));
    border-radius: 4px;
    transition: width 0.3s ease;
}

/* 课程详情页面响应式 */
@media (max-width: 768px) {
    .course-detail-main {
        padding-top: 80px;
    }
    
    .course-header {
        padding: 20px;
        margin-bottom: 20px;
    }
    
    .course-title {
        font-size: 2rem;
    }
    
    .course-subtitle {
        font-size: 1.1rem;
    }
    
    .course-meta {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }
    
    .course-section {
        padding: 20px;
        margin-bottom: 20px;
    }
    
    .course-section h3 {
        font-size: 1.5rem;
    }
    
    .instructor-info {
        flex-direction: column;
        text-align: center;
    }
    
    .instructor-avatar img {
        width: 80px;
        height: 80px;
    }
    
    .purchase-card {
        position: static;
        margin-top: 2rem;
    }
    
    .current-price {
        font-size: 1.75rem;
    }
}

/* 认证页面样式 */
.auth-section {
    background: linear-gradient(135deg, var(--bg-light) 0%, var(--secondary-color) 100%);
    padding-top: 80px;
    min-height: 100vh;
}

.auth-container {
    padding: 2rem;
    max-width: 500px;
    margin: 0 auto;
}

.auth-tabs {
    display: flex;
    background: var(--secondary-color);
    border-radius: 12px;
    padding: 4px;
    margin-bottom: 2rem;
}

.auth-tab {
    flex: 1;
    background: transparent;
    border: none;
    padding: 12px 20px;
    border-radius: 8px;
    font-weight: 500;
    color: var(--text-secondary);
    transition: all 0.3s ease;
    cursor: pointer;
}

.auth-tab.active {
    background: var(--bg-light);
    color: var(--text-primary);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.auth-tab:hover:not(.active) {
    color: var(--accent-color);
}

.auth-title {
    font-family: var(--font-display);
    font-size: 1.75rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.auth-subtitle {
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.glass-input {
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 8px;
    color: var(--text-primary);
    transition: all 0.3s ease;
}

.glass-input:focus {
    background: rgba(255, 255, 255, 0.95);
    border-color: var(--accent-color);
    box-shadow: 0 0 0 0.2rem rgba(0, 122, 255, 0.25);
}

.glass-input-addon {
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.3);
    color: var(--text-secondary);
}

.glass-input.is-invalid {
    border-color: #dc3545;
    background: rgba(255, 255, 255, 0.95);
}

.form-check-input:checked {
    background-color: var(--accent-color);
    border-color: var(--accent-color);
}

.form-check-input:focus {
    border-color: var(--accent-color);
    box-shadow: 0 0 0 0.2rem rgba(0, 122, 255, 0.25);
}

.alert {
    border: none;
    border-radius: 12px;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.alert-success {
    background: rgba(52, 199, 89, 0.1);
    color: var(--success-color);
    border: 1px solid rgba(52, 199, 89, 0.2);
}

.alert-danger {
    background: rgba(255, 59, 48, 0.1);
    color: #FF3B30;
    border: 1px solid rgba(255, 59, 48, 0.2);
}

.alert-info {
    background: rgba(0, 122, 255, 0.1);
    color: var(--accent-color);
    border: 1px solid rgba(0, 122, 255, 0.2);
}

/* 认证页面响应式 */
@media (max-width: 768px) {
    .auth-container {
        padding: 1.5rem;
        margin: 1rem;
    }
    
    .auth-title {
        font-size: 1.5rem;
    }
    
    .auth-tabs {
        margin-bottom: 1.5rem;
    }
}

/* 视频播放页面样式 */
.video-player-body {
    background: var(--secondary-color);
    padding-top: 76px;
}

.video-player-main {
    padding: 2rem 0;
    min-height: calc(100vh - 76px);
}

.video-container {
    background: var(--bg-light);
    border-radius: 20px;
    padding: 2rem;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    margin-bottom: 2rem;
}

.video-player {
    position: relative;
    width: 100%;
    border-radius: 16px;
    overflow: hidden;
    background: #000;
    margin-bottom: 2rem;
}

.video-player video {
    width: 100%;
    height: auto;
    min-height: 400px;
    display: block;
}

.trial-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10;
}

.trial-message {
    text-align: center;
    color: white;
    padding: 2rem;
}

.trial-message h4 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.trial-message p {
    margin-bottom: 1.5rem;
    opacity: 0.8;
}

.video-info {
    margin-bottom: 2rem;
}

.video-info h3 {
    font-family: var(--font-display);
    font-size: 1.75rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.video-meta {
    display: flex;
    gap: 1.5rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.video-meta span {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.video-description {
    background: var(--secondary-color);
    border-radius: 12px;
    padding: 1.5rem;
}

.video-description h5 {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.video-description p {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 0;
}

.course-sidebar {
    background: var(--bg-light);
    border-radius: 20px;
    padding: 2rem;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    height: fit-content;
    position: sticky;
    top: 100px;
}

.course-info {
    margin-bottom: 2rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--secondary-color);
}

.course-info h5 {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.course-info p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.course-progress {
    margin-top: 1rem;
}

.course-progress .progress {
    height: 8px;
    background: var(--secondary-color);
    border-radius: 4px;
    margin-bottom: 0.5rem;
}

.course-progress .progress-bar {
    background: var(--accent-color);
    border-radius: 4px;
    transition: width 0.3s ease;
}

.lesson-list {
    margin-bottom: 2rem;
}

.lesson-list h6 {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.lesson-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem;
    border-radius: 12px;
    margin-bottom: 0.5rem;
    cursor: pointer;
    transition: all 0.3s ease;
    background: var(--secondary-color);
}

.lesson-item:hover {
    background: rgba(0, 122, 255, 0.1);
    transform: translateX(5px);
}

.lesson-item.active {
    background: var(--accent-color);
    color: white;
}

.lesson-item.active .lesson-info h6,
.lesson-item.active .lesson-info p,
.lesson-item.active .lesson-info small {
    color: white;
}

.lesson-info h6 {
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
    color: var(--text-primary);
}

.lesson-info p {
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-bottom: 0.25rem;
    line-height: 1.4;
}

.lesson-info small {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.lesson-status {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.lesson-status i {
    font-size: 1rem;
}

.learning-tools h6 {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.tool-buttons .btn {
    border-radius: 8px;
    font-size: 0.85rem;
    padding: 0.5rem 1rem;
}

.speed-options {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.5rem;
}

.speed-btn {
    border-radius: 8px;
    font-size: 0.85rem;
    padding: 0.5rem;
}

/* 视频播放页面响应式 */
@media (max-width: 992px) {
    .video-player-main {
        padding: 1rem 0;
    }
    
    .video-container,
    .course-sidebar {
        margin-bottom: 1.5rem;
        padding: 1.5rem;
    }
    
    .course-sidebar {
        position: static;
    }
    
    .video-meta {
        flex-direction: column;
        gap: 0.5rem;
    }
}

@media (max-width: 768px) {
    .video-player-main {
        padding: 0.5rem 0;
    }
    
    .video-container,
    .course-sidebar {
        border-radius: 16px;
        padding: 1rem;
    }
    
    .video-player video {
        min-height: 250px;
    }
    
    .video-info h3 {
        font-size: 1.5rem;
    }
    
    .lesson-item {
        padding: 0.75rem;
    }
    
    .lesson-info h6 {
        font-size: 0.85rem;
    }
    
    .lesson-info p {
        font-size: 0.75rem;
    }
    
    .speed-options {
        grid-template-columns: repeat(2, 1fr);
    }
}