/* 
 * 91视频在线观看18 - cdslhdyy.com
 * 全新原创CSS样式 - 2025年12月
 * 紫粉渐变主题设计
 */

/* CSS变量定义 */
:root {
    --primary-gradient: linear-gradient(135deg, #8B5CF6 0%, #EC4899 50%, #F97316 100%);
    --secondary-gradient: linear-gradient(180deg, #1E1B4B 0%, #312E81 100%);
    --accent-color: #F472B6;
    --text-primary: #F8FAFC;
    --text-secondary: #CBD5E1;
    --bg-dark: #0F0D1A;
    --bg-card: rgba(30, 27, 75, 0.85);
    --border-glow: rgba(139, 92, 246, 0.4);
    --shadow-purple: 0 8px 32px rgba(139, 92, 246, 0.3);
    --shadow-pink: 0 4px 24px rgba(236, 72, 153, 0.25);
}

/* 全局重置 */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.7;
    min-height: 100vh;
    overflow-x: hidden;
}

/* 背景动态效果 */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(ellipse at 20% 20%, rgba(139, 92, 246, 0.15) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 80%, rgba(236, 72, 153, 0.12) 0%, transparent 50%),
        radial-gradient(ellipse at 50% 50%, rgba(249, 115, 22, 0.08) 0%, transparent 60%);
    pointer-events: none;
    z-index: -1;
}

/* 链接样式 */
a {
    color: var(--accent-color);
    text-decoration: none;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

a:hover {
    color: #F9A8D4;
    text-shadow: 0 0 12px rgba(244, 114, 182, 0.6);
}

/* 顶部导航栏 */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: linear-gradient(180deg, rgba(15, 13, 26, 0.98) 0%, rgba(15, 13, 26, 0.92) 100%);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-glow);
    padding: 0 24px;
}

.header-inner {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.site-logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-icon {
    width: 48px;
    height: 48px;
    background: var(--primary-gradient);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    font-weight: 800;
    color: white;
    box-shadow: var(--shadow-purple);
}

.logo-text {
    font-size: 22px;
    font-weight: 700;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* 主导航 */
.main-nav {
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-link {
    padding: 10px 20px;
    font-size: 15px;
    font-weight: 500;
    color: var(--text-secondary);
    border-radius: 8px;
    transition: all 0.3s ease;
    position: relative;
}

.nav-link:hover,
.nav-link.active {
    color: var(--text-primary);
    background: rgba(139, 92, 246, 0.15);
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: 6px;
    left: 50%;
    transform: translateX(-50%);
    width: 20px;
    height: 3px;
    background: var(--primary-gradient);
    border-radius: 2px;
}

/* 搜索框 */
.search-wrapper {
    position: relative;
    width: 280px;
}

.search-input {
    width: 100%;
    padding: 12px 48px 12px 20px;
    background: rgba(49, 46, 129, 0.5);
    border: 1px solid var(--border-glow);
    border-radius: 24px;
    color: var(--text-primary);
    font-size: 14px;
    outline: none;
    transition: all 0.3s ease;
}

.search-input::placeholder {
    color: var(--text-secondary);
}

.search-input:focus {
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(244, 114, 182, 0.2);
}

.search-btn {
    position: absolute;
    right: 6px;
    top: 50%;
    transform: translateY(-50%);
    width: 36px;
    height: 36px;
    background: var(--primary-gradient);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.3s ease;
}

.search-btn:hover {
    transform: translateY(-50%) scale(1.1);
}

.search-btn svg {
    width: 18px;
    height: 18px;
    fill: white;
}

/* 移动端菜单按钮 */
.mobile-menu-btn {
    display: none;
    width: 44px;
    height: 44px;
    background: transparent;
    border: none;
    cursor: pointer;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 6px;
}

.mobile-menu-btn span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: all 0.3s ease;
}

/* 主内容区域 */
.main-content {
    padding-top: 72px;
}

/* Hero区域 */
.hero-section {
    position: relative;
    min-height: 560px;
    display: flex;
    align-items: center;
    padding: 80px 24px;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background: var(--secondary-gradient);
    z-index: -2;
}

.hero-bg::after {
    content: '';
    position: absolute;
    inset: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="50" cy="50" r="1" fill="rgba(255,255,255,0.1)"/></svg>');
    background-size: 50px 50px;
    opacity: 0.5;
}

.hero-inner {
    max-width: 1400px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-content h1 {
    font-size: 48px;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 24px;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-content p {
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: 36px;
    max-width: 500px;
}

.hero-actions {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 16px 32px;
    background: var(--primary-gradient);
    color: white;
    font-size: 16px;
    font-weight: 600;
    border: none;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-purple);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 40px rgba(139, 92, 246, 0.4);
}

.btn-secondary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 16px 32px;
    background: transparent;
    color: var(--text-primary);
    font-size: 16px;
    font-weight: 600;
    border: 2px solid var(--border-glow);
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-secondary:hover {
    border-color: var(--accent-color);
    background: rgba(244, 114, 182, 0.1);
}

.hero-visual {
    position: relative;
}

.hero-image-wrapper {
    position: relative;
    border-radius: 24px;
    overflow: hidden;
    box-shadow: var(--shadow-purple);
}

.hero-image-wrapper::before {
    content: '';
    position: absolute;
    inset: -2px;
    background: var(--primary-gradient);
    border-radius: 26px;
    z-index: -1;
}

.hero-image-wrapper img {
    width: 100%;
    height: auto;
    display: block;
    border-radius: 24px;
}

/* 统计数据 */
.stats-bar {
    display: flex;
    gap: 48px;
    margin-top: 48px;
}

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

.stat-number {
    font-size: 36px;
    font-weight: 800;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    font-size: 14px;
    color: var(--text-secondary);
    margin-top: 4px;
}

/* 内容区块通用样式 */
.content-section {
    padding: 80px 24px;
}

.section-header {
    text-align: center;
    margin-bottom: 48px;
}

.section-title {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 16px;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-subtitle {
    font-size: 16px;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

.section-inner {
    max-width: 1400px;
    margin: 0 auto;
}

/* 视频卡片网格 */
.video-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.video-card {
    background: var(--bg-card);
    border-radius: 16px;
    overflow: hidden;
    border: 1px solid rgba(139, 92, 246, 0.2);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
}

.video-card:hover {
    transform: translateY(-8px);
    border-color: var(--accent-color);
    box-shadow: var(--shadow-pink);
}

.video-thumb {
    position: relative;
    aspect-ratio: 16/10;
    overflow: hidden;
}

.video-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.video-card:hover .video-thumb img {
    transform: scale(1.08);
}

.play-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.4);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.video-card:hover .play-overlay {
    opacity: 1;
}

.play-btn {
    width: 64px;
    height: 64px;
    background: var(--primary-gradient);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 20px rgba(139, 92, 246, 0.5);
    transform: scale(0.8);
    transition: transform 0.3s ease;
}

.video-card:hover .play-btn {
    transform: scale(1);
}

.play-btn svg {
    width: 28px;
    height: 28px;
    fill: white;
    margin-left: 4px;
}

.video-duration {
    position: absolute;
    bottom: 8px;
    right: 8px;
    padding: 4px 8px;
    background: rgba(0, 0, 0, 0.75);
    color: white;
    font-size: 12px;
    font-weight: 500;
    border-radius: 4px;
}

.video-info {
    padding: 16px;
}

.video-title {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    line-height: 1.4;
}

.video-meta {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 13px;
    color: var(--text-secondary);
}

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

/* 分类标签 */
.category-tabs {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-bottom: 36px;
    flex-wrap: wrap;
}

.category-tab {
    padding: 10px 24px;
    background: rgba(49, 46, 129, 0.5);
    border: 1px solid var(--border-glow);
    border-radius: 24px;
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
}

.category-tab:hover,
.category-tab.active {
    background: var(--primary-gradient);
    border-color: transparent;
    color: white;
}

/* 专家展示区 */
.expert-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.expert-card {
    background: var(--bg-card);
    border-radius: 20px;
    padding: 32px 24px;
    text-align: center;
    border: 1px solid rgba(139, 92, 246, 0.2);
    transition: all 0.4s ease;
}

.expert-card:hover {
    transform: translateY(-6px);
    border-color: var(--accent-color);
    box-shadow: var(--shadow-pink);
}

.expert-avatar {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    margin: 0 auto 20px;
    position: relative;
}

.expert-avatar::before {
    content: '';
    position: absolute;
    inset: -3px;
    background: var(--primary-gradient);
    border-radius: 50%;
    z-index: -1;
}

.expert-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 50%;
}

.expert-name {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.expert-title {
    font-size: 14px;
    color: var(--accent-color);
    margin-bottom: 12px;
}

.expert-desc {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.6;
}

.expert-badge {
    display: inline-block;
    padding: 4px 12px;
    background: rgba(139, 92, 246, 0.2);
    color: var(--accent-color);
    font-size: 12px;
    border-radius: 12px;
    margin-top: 12px;
}

/* 用户评价 */
.review-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.review-card {
    background: var(--bg-card);
    border-radius: 16px;
    padding: 28px;
    border: 1px solid rgba(139, 92, 246, 0.2);
    transition: all 0.3s ease;
}

.review-card:hover {
    border-color: var(--accent-color);
}

.review-header {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 16px;
}

.review-avatar {
    width: 52px;
    height: 52px;
    border-radius: 50%;
    object-fit: cover;
}

.review-user-info h4 {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-primary);
}

.review-user-info span {
    font-size: 13px;
    color: var(--text-secondary);
}

.review-stars {
    color: #FBBF24;
    font-size: 14px;
    margin-bottom: 12px;
}

.review-text {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* 功能特色区 */
.feature-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.feature-card {
    background: var(--bg-card);
    border-radius: 20px;
    padding: 36px 28px;
    text-align: center;
    border: 1px solid rgba(139, 92, 246, 0.2);
    transition: all 0.4s ease;
}

.feature-card:hover {
    transform: translateY(-8px);
    border-color: var(--accent-color);
    box-shadow: var(--shadow-purple);
}

.feature-icon {
    width: 72px;
    height: 72px;
    margin: 0 auto 20px;
    background: var(--primary-gradient);
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 32px;
}

.feature-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 12px;
}

.feature-desc {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* 社区区块 */
.community-section {
    background: var(--secondary-gradient);
    position: relative;
    overflow: hidden;
}

.community-section::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(236, 72, 153, 0.2) 0%, transparent 70%);
    border-radius: 50%;
}

.community-inner {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.community-content h2 {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 20px;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.community-content p {
    font-size: 16px;
    color: var(--text-secondary);
    margin-bottom: 28px;
    line-height: 1.8;
}

.community-features {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.community-feature {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 18px;
    background: rgba(139, 92, 246, 0.1);
    border-radius: 12px;
    font-size: 14px;
    color: var(--text-primary);
}

.community-feature svg {
    width: 20px;
    height: 20px;
    fill: var(--accent-color);
}

.community-image {
    border-radius: 24px;
    overflow: hidden;
    box-shadow: var(--shadow-purple);
}

.community-image img {
    width: 100%;
    height: auto;
    display: block;
}

/* 页脚 */
.site-footer {
    background: linear-gradient(180deg, var(--bg-dark) 0%, #0A0812 100%);
    padding: 60px 24px 30px;
    border-top: 1px solid var(--border-glow);
}

.footer-inner {
    max-width: 1400px;
    margin: 0 auto;
}

.footer-top {
    display: grid;
    grid-template-columns: 2fr repeat(4, 1fr);
    gap: 30px;
    padding-bottom: 40px;
    border-bottom: 1px solid rgba(139, 92, 246, 0.2);
}

.footer-brand p {
    font-size: 14px;
    color: var(--text-secondary);
    margin-top: 16px;
    line-height: 1.7;
}

.footer-column h4 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 20px;
}

.footer-column ul {
    list-style: none;
}

.footer-column li {
    margin-bottom: 12px;
}

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

.footer-column a:hover {
    color: var(--accent-color);
}

.footer-contact p {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.footer-qr {
    display: flex;
    gap: 16px;
    margin-top: 16px;
}

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

.qr-item img {
    width: 80px;
    height: 80px;
    border-radius: 8px;
    background: white;
    padding: 4px;
}

.qr-item span {
    display: block;
    font-size: 12px;
    color: var(--text-secondary);
    margin-top: 6px;
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 24px;
    font-size: 13px;
    color: var(--text-secondary);
}

.footer-links {
    display: flex;
    gap: 24px;
}

.footer-links a {
    color: var(--text-secondary);
}

/* 面包屑导航 */
.breadcrumb {
    padding: 16px 24px;
    background: rgba(30, 27, 75, 0.5);
}

.breadcrumb-inner {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
}

.breadcrumb a {
    color: var(--text-secondary);
}

.breadcrumb span {
    color: var(--text-secondary);
}

.breadcrumb-current {
    color: var(--accent-color);
}

/* 分页 */
.pagination {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-top: 48px;
}

.page-btn {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-card);
    border: 1px solid var(--border-glow);
    border-radius: 10px;
    color: var(--text-secondary);
    font-size: 14px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.page-btn:hover,
.page-btn.active {
    background: var(--primary-gradient);
    border-color: transparent;
    color: white;
}

/* 响应式设计 */
@media (max-width: 1200px) {
    .video-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .expert-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .feature-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-top {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 992px) {
    .hero-inner {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-content p {
        margin: 0 auto 36px;
    }
    
    .hero-actions {
        justify-content: center;
    }
    
    .stats-bar {
        justify-content: center;
    }
    
    .hero-visual {
        max-width: 500px;
        margin: 0 auto;
    }
    
    .community-inner {
        grid-template-columns: 1fr;
    }
    
    .main-nav {
        display: none;
    }
    
    .mobile-menu-btn {
        display: flex;
    }
    
    .search-wrapper {
        width: 200px;
    }
}

@media (max-width: 768px) {
    .hero-content h1 {
        font-size: 32px;
    }
    
    .video-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
    }
    
    .expert-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .review-grid {
        grid-template-columns: 1fr;
    }
    
    .feature-grid {
        grid-template-columns: 1fr;
    }
    
    .section-title {
        font-size: 28px;
    }
    
    .footer-top {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: 16px;
        text-align: center;
    }
    
    .search-wrapper {
        display: none;
    }
}

@media (max-width: 480px) {
    .video-grid {
        grid-template-columns: 1fr;
    }
    
    .expert-grid {
        grid-template-columns: 1fr;
    }
    
    .stats-bar {
        flex-direction: column;
        gap: 24px;
    }
    
    .hero-actions {
        flex-direction: column;
    }
    
    .btn-primary,
    .btn-secondary {
        width: 100%;
        justify-content: center;
    }
}

/* 干扰标签样式 - 隐藏但对SEO有效 */
.seo-tags {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* 懒加载占位 */
.lazy-placeholder {
    background: linear-gradient(90deg, rgba(49, 46, 129, 0.5) 25%, rgba(139, 92, 246, 0.3) 50%, rgba(49, 46, 129, 0.5) 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
}

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

/* 滚动动画 */
.fade-in-up {
    opacity: 1;
    transform: translateY(0);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in-up.visible {
    opacity: 1;
    transform: translateY(0);
}