/* 91 全站样式表 - zxobuj.cn */
:root {
    --primary-color: #ff6b8a;
    --secondary-color: #ff9a5c;
    --accent-color: #8b5cf6;
    --dark-bg: #1a1a2e;
    --light-bg: #f8f9fa;
    --text-dark: #2d3436;
    --text-light: #636e72;
    --gradient-primary: linear-gradient(135deg, #ff6b8a 0%, #ff9a5c 100%);
    --gradient-accent: linear-gradient(135deg, #8b5cf6 0%, #ec4899 100%);
}

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

body {
    font-family: 'PingFang SC', 'Microsoft YaHei', -apple-system, BlinkMacSystemFont, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background: var(--light-bg);
}

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

/* 头部导航 */
.header {
    background: white;
    box-shadow: 0 2px 20px rgba(0,0,0,0.08);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.nav-wrapper {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 0;
}

.logo {
    display: flex;
    align-items: center;
    text-decoration: none;
}

.logo img {
    height: 45px;
    margin-right: 10px;
}

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

.nav-menu {
    display: flex;
    list-style: none;
    gap: 35px;
}

.nav-menu a {
    text-decoration: none;
    color: var(--text-dark);
    font-weight: 500;
    font-size: 15px;
    transition: color 0.3s;
    position: relative;
}

.nav-menu a:hover,
.nav-menu a.active {
    color: var(--primary-color);
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: width 0.3s;
}

.nav-menu a:hover::after,
.nav-menu a.active::after {
    width: 100%;
}

/* 搜索框 */
.search-bar {
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    padding: 15px 0;
    border-bottom: 1px solid #eee;
}

.search-container {
    display: flex;
    justify-content: center;
}

.search-box {
    display: flex;
    width: 100%;
    max-width: 600px;
    background: white;
    border-radius: 50px;
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}

.search-box input {
    flex: 1;
    padding: 14px 25px;
    border: none;
    outline: none;
    font-size: 15px;
}

.search-box button {
    padding: 14px 30px;
    background: var(--gradient-primary);
    border: none;
    color: white;
    font-weight: 600;
    cursor: pointer;
    transition: opacity 0.3s;
}

.search-box button:hover {
    opacity: 0.9;
}

/* Hero区域 */
.hero {
    background: var(--gradient-primary);
    padding: 80px 0;
    color: white;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('../images/hero-banner.jpg') center/cover;
    opacity: 0.2;
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
}

.hero h1 {
    font-size: 48px;
    margin-bottom: 20px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.2);
}

.hero p {
    font-size: 20px;
    opacity: 0.95;
    max-width: 700px;
    margin: 0 auto 30px;
}

.hero-btn {
    display: inline-block;
    padding: 15px 40px;
    background: white;
    color: var(--primary-color);
    text-decoration: none;
    border-radius: 50px;
    font-weight: 600;
    font-size: 16px;
    transition: transform 0.3s, box-shadow 0.3s;
}

.hero-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
}

/* 视频卡片 */
.video-section {
    padding: 70px 0;
}

.section-title {
    text-align: center;
    margin-bottom: 50px;
}

.section-title h2 {
    font-size: 36px;
    color: var(--text-dark);
    margin-bottom: 15px;
}

.section-title p {
    color: var(--text-light);
    font-size: 16px;
}

.video-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.video-card {
    background: white;
    border-radius: 16px;
    overflow: hidden;
    box-shadow: 0 5px 20px rgba(0,0,0,0.08);
    transition: transform 0.3s, box-shadow 0.3s;
}

.video-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 15px 40px rgba(0,0,0,0.15);
}

.video-thumb {
    position: relative;
    padding-top: 56.25%;
    overflow: hidden;
}

.video-thumb img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s;
}

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

.play-btn {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0);
    width: 70px;
    height: 70px;
    background: rgba(255,255,255,0.95);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.3s;
    box-shadow: 0 5px 20px rgba(0,0,0,0.3);
}

.video-card:hover .play-btn {
    transform: translate(-50%, -50%) scale(1);
}

.play-btn::after {
    content: '';
    width: 0;
    height: 0;
    border-left: 22px solid var(--primary-color);
    border-top: 14px solid transparent;
    border-bottom: 14px solid transparent;
    margin-left: 5px;
}

.video-info {
    padding: 20px;
}

.video-info h3 {
    font-size: 17px;
    margin-bottom: 10px;
    color: var(--text-dark);
    line-height: 1.4;
}

.video-meta {
    display: flex;
    gap: 15px;
    color: var(--text-light);
    font-size: 13px;
}

.video-meta span {
    display: flex;
    align-items: center;
    gap: 5px;
}

/* 专家区域 */
.expert-section {
    background: white;
    padding: 70px 0;
}

.expert-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.expert-card {
    text-align: center;
    padding: 40px 30px;
    border-radius: 16px;
    background: var(--light-bg);
    transition: transform 0.3s;
}

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

.expert-avatar {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    object-fit: cover;
    margin-bottom: 20px;
    border: 4px solid white;
    box-shadow: 0 5px 20px rgba(0,0,0,0.1);
}

.expert-card h3 {
    font-size: 20px;
    margin-bottom: 8px;
}

.expert-card .title {
    color: var(--primary-color);
    font-size: 14px;
    margin-bottom: 15px;
}

.expert-card p {
    color: var(--text-light);
    font-size: 14px;
    line-height: 1.6;
}

/* 社区区域 */
.community-section {
    padding: 70px 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.community-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
    align-items: center;
}

.community-text h2 {
    font-size: 36px;
    margin-bottom: 20px;
}

.community-text p {
    font-size: 16px;
    opacity: 0.9;
    margin-bottom: 30px;
    line-height: 1.8;
}

.community-features {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.feature-item {
    background: rgba(255,255,255,0.15);
    padding: 20px;
    border-radius: 12px;
    backdrop-filter: blur(10px);
}

.feature-item h4 {
    font-size: 16px;
    margin-bottom: 8px;
}

.feature-item p {
    font-size: 13px;
    opacity: 0.8;
    margin: 0;
}

.community-image img {
    width: 100%;
    border-radius: 16px;
    box-shadow: 0 20px 50px rgba(0,0,0,0.3);
}

/* 联系区域 */
.contact-section {
    padding: 70px 0;
    background: white;
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

.contact-item {
    text-align: center;
    padding: 30px;
    background: var(--light-bg);
    border-radius: 12px;
}

.contact-item img {
    width: 120px;
    height: 120px;
    margin-bottom: 15px;
    border-radius: 8px;
}

.contact-item h4 {
    font-size: 16px;
    margin-bottom: 8px;
}

.contact-item p {
    color: var(--text-light);
    font-size: 13px;
}

/* 页脚 */
.footer {
    background: var(--dark-bg);
    color: white;
    padding: 50px 0 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-brand .logo-text {
    font-size: 24px;
    margin-bottom: 15px;
    display: block;
}

.footer-brand p {
    color: rgba(255,255,255,0.7);
    font-size: 14px;
    line-height: 1.8;
}

.footer-links h4 {
    font-size: 16px;
    margin-bottom: 20px;
    color: white;
}

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

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

.footer-links a {
    color: rgba(255,255,255,0.7);
    text-decoration: none;
    font-size: 14px;
    transition: color 0.3s;
}

.footer-links a:hover {
    color: var(--primary-color);
}

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.1);
    padding-top: 25px;
    text-align: center;
    color: rgba(255,255,255,0.6);
    font-size: 13px;
}

/* 面包屑 */
.breadcrumb {
    padding: 20px 0;
    background: white;
    border-bottom: 1px solid #eee;
}

.breadcrumb-list {
    display: flex;
    list-style: none;
    gap: 10px;
    font-size: 14px;
}

.breadcrumb-list a {
    color: var(--text-light);
    text-decoration: none;
}

.breadcrumb-list a:hover {
    color: var(--primary-color);
}

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

/* 响应式设计 */
@media (max-width: 992px) {
    .video-grid,
    .expert-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .community-content {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .contact-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }
    
    .hero h1 {
        font-size: 32px;
    }
    
    .hero p {
        font-size: 16px;
    }
    
    .video-grid,
    .expert-grid {
        grid-template-columns: 1fr;
    }
    
    .section-title h2 {
        font-size: 28px;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
    }
}

/* 懒加载占位 */
img[data-src] {
    opacity: 0;
    transition: opacity 0.3s;
}

img.loaded {
    opacity: 1;
}