/* 四虎tv - 主样式表 */
/* 品牌：四虎tv | 域名：ulgto.cn */

/* ===== 基础重置与变量 ===== */
:root {
    --primary-color: #ff6b9d;
    --secondary-color: #9b59b6;
    --accent-color: #e74c8c;
    --text-color: #333333;
    --text-light: #666666;
    --bg-color: #ffffff;
    --bg-light: #f8f9fa;
    --bg-dark: #1a1a2e;
    --gradient-primary: linear-gradient(135deg, #ff6b9d 0%, #9b59b6 100%);
    --shadow-light: 0 2px 10px rgba(0,0,0,0.1);
    --shadow-medium: 0 4px 20px rgba(0,0,0,0.15);
    --border-radius: 12px;
    --transition: all 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
}

img {
    max-width: 100%;
    height: auto;
}

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

/* ===== 头部导航 ===== */
.header {
    background: var(--bg-color);
    box-shadow: var(--shadow-light);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
}

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

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

.logo img {
    height: 45px;
    width: auto;
}

.logo-text {
    font-size: 1.5rem;
    font-weight: bold;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

.nav-menu a {
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-color);
    padding: 8px 0;
    position: relative;
}

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

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

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

/* ===== 搜索框 ===== */
.search-bar {
    background: var(--bg-light);
    padding: 15px 0;
    margin-top: 75px;
}

.search-container {
    max-width: 600px;
    margin: 0 auto;
    display: flex;
    gap: 10px;
}

.search-input {
    flex: 1;
    padding: 12px 20px;
    border: 2px solid transparent;
    border-radius: 25px;
    font-size: 1rem;
    background: var(--bg-color);
    box-shadow: var(--shadow-light);
    transition: var(--transition);
}

.search-input:focus {
    outline: none;
    border-color: var(--primary-color);
}

.search-btn {
    padding: 12px 30px;
    background: var(--gradient-primary);
    color: white;
    border: none;
    border-radius: 25px;
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition);
}

.search-btn:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-medium);
}

/* ===== 英雄区域 ===== */
.hero {
    background: var(--gradient-primary);
    padding: 80px 0;
    color: white;
    text-align: center;
    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: 0.3;
}

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

.hero h1 {
    font-size: 3rem;
    margin-bottom: 20px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

.hero p {
    font-size: 1.3rem;
    max-width: 700px;
    margin: 0 auto 30px;
    opacity: 0.95;
}

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

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

.stat-number {
    font-size: 2.5rem;
    font-weight: bold;
    display: block;
}

.stat-label {
    font-size: 1rem;
    opacity: 0.9;
}

/* ===== 视频卡片 ===== */
.video-section {
    padding: 60px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 40px;
}

.section-header h2 {
    font-size: 2rem;
    color: var(--text-color);
    margin-bottom: 10px;
}

.section-header p {
    color: var(--text-light);
    font-size: 1.1rem;
}

.video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 25px;
}

.video-card {
    background: var(--bg-color);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow-light);
    transition: var(--transition);
    cursor: pointer;
}

.video-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-medium);
}

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

.video-thumbnail img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.video-card:hover .video-thumbnail img {
    transform: scale(1.05);
}

.play-btn {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 60px;
    height: 60px;
    background: rgba(255,255,255,0.9);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: var(--transition);
}

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

.play-btn::after {
    content: '';
    width: 0;
    height: 0;
    border-left: 18px solid var(--primary-color);
    border-top: 12px solid transparent;
    border-bottom: 12px solid transparent;
    margin-left: 5px;
}

.video-duration {
    position: absolute;
    bottom: 10px;
    right: 10px;
    background: rgba(0,0,0,0.8);
    color: white;
    padding: 3px 8px;
    border-radius: 4px;
    font-size: 0.85rem;
}

.video-info {
    padding: 15px;
}

.video-title {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 8px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.video-meta {
    display: flex;
    justify-content: space-between;
    color: var(--text-light);
    font-size: 0.85rem;
}

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

/* ===== 模块区域 ===== */
.module-section {
    padding: 60px 0;
    background: var(--bg-light);
}

.module-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 25px;
}

.module-card {
    background: var(--bg-color);
    padding: 30px;
    border-radius: var(--border-radius);
    text-align: center;
    box-shadow: var(--shadow-light);
    transition: var(--transition);
}

.module-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-medium);
}

.module-icon {
    width: 70px;
    height: 70px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    font-size: 2rem;
    color: white;
}

.module-card h3 {
    font-size: 1.2rem;
    margin-bottom: 10px;
    color: var(--text-color);
}

.module-card p {
    color: var(--text-light);
    font-size: 0.95rem;
}

/* ===== 专家展示 ===== */
.expert-section {
    padding: 60px 0;
}

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

.expert-card {
    background: var(--bg-color);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow-light);
    transition: var(--transition);
}

.expert-card:hover {
    box-shadow: var(--shadow-medium);
}

.expert-image {
    height: 200px;
    overflow: hidden;
}

.expert-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

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

.expert-info {
    padding: 20px;
}

.expert-name {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 5px;
}

.expert-title {
    color: var(--primary-color);
    font-size: 0.95rem;
    margin-bottom: 10px;
}

.expert-desc {
    color: var(--text-light);
    font-size: 0.9rem;
    margin-bottom: 15px;
}

.expert-actions {
    display: flex;
    gap: 10px;
}

.btn {
    padding: 8px 20px;
    border-radius: 20px;
    font-size: 0.9rem;
    cursor: pointer;
    transition: var(--transition);
    border: none;
}

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

.btn-outline {
    background: transparent;
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
}

.btn:hover {
    transform: scale(1.05);
}

/* ===== 合作伙伴 ===== */
.partner-section {
    padding: 60px 0;
    background: var(--bg-light);
}

.partner-logos {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    gap: 40px;
}

.partner-logos img {
    height: 60px;
    opacity: 0.7;
    transition: var(--transition);
}

.partner-logos img:hover {
    opacity: 1;
}

/* ===== 用户评价 ===== */
.review-section {
    padding: 60px 0;
}

.review-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 25px;
}

.review-card {
    background: var(--bg-color);
    padding: 25px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-light);
}

.review-header {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 15px;
}

.review-avatar {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: bold;
}

.review-user {
    flex: 1;
}

.review-name {
    font-weight: 600;
}

.review-date {
    color: var(--text-light);
    font-size: 0.85rem;
}

.review-stars {
    color: #ffc107;
}

.review-content {
    color: var(--text-light);
    line-height: 1.7;
}

/* ===== FAQ区域 ===== */
.faq-section {
    padding: 60px 0;
    background: var(--bg-light);
}

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

.faq-item {
    background: var(--bg-color);
    margin-bottom: 15px;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow-light);
}

.faq-question {
    padding: 20px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.faq-answer {
    padding: 0 20px 20px;
    color: var(--text-light);
}

/* ===== 联系我们 ===== */
.contact-section {
    padding: 60px 0;
}

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

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

.contact-icon {
    width: 60px;
    height: 60px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 15px;
    color: white;
    font-size: 1.5rem;
}

.contact-card h4 {
    margin-bottom: 10px;
}

.contact-card p {
    color: var(--text-light);
}

/* ===== 页脚 ===== */
.footer {
    background: var(--bg-dark);
    color: white;
    padding: 60px 0 30px;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-col h4 {
    font-size: 1.1rem;
    margin-bottom: 20px;
    color: var(--primary-color);
}

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

.footer-col li {
    margin-bottom: 10px;
}

.footer-col a {
    color: rgba(255,255,255,0.7);
    transition: var(--transition);
}

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

.footer-qr {
    display: flex;
    gap: 20px;
}

.footer-qr img {
    width: 100px;
    border-radius: 8px;
}

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.1);
    padding-top: 30px;
    text-align: center;
    color: rgba(255,255,255,0.6);
    font-size: 0.9rem;
}

.social-links {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-top: 20px;
}

.social-links a {
    width: 40px;
    height: 40px;
    background: rgba(255,255,255,0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    transition: var(--transition);
}

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

/* ===== 面包屑导航 ===== */
.breadcrumb {
    padding: 15px 0;
    background: var(--bg-light);
}

.breadcrumb-list {
    display: flex;
    list-style: none;
    gap: 10px;
    font-size: 0.9rem;
}

.breadcrumb-list li::after {
    content: '/';
    margin-left: 10px;
    color: var(--text-light);
}

.breadcrumb-list li:last-child::after {
    content: '';
}

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

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

/* ===== 响应式设计 ===== */
@media (max-width: 768px) {
    .header-inner {
        flex-wrap: wrap;
    }
    
    .nav-menu {
        width: 100%;
        justify-content: center;
        gap: 15px;
        margin-top: 15px;
        flex-wrap: wrap;
    }
    
    .hero h1 {
        font-size: 2rem;
    }
    
    .hero-stats {
        flex-wrap: wrap;
        gap: 30px;
    }
    
    .video-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .footer-qr {
        justify-content: center;
    }
}

/* ===== 动画效果 ===== */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeIn 0.6s ease forwards;
}

/* ===== 懒加载占位 ===== */
.lazy-load {
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: loading 1.5s infinite;
}

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

/* ===== 内页样式 ===== */
.page-header {
    background: var(--gradient-primary);
    padding: 60px 0;
    color: white;
    text-align: center;
    margin-top: 75px;
}

.page-header h1 {
    font-size: 2.5rem;
    margin-bottom: 15px;
}

.page-content {
    padding: 60px 0;
}

/* ===== 工具卡片 ===== */
.tool-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 25px;
}

.tool-card {
    background: var(--bg-color);
    border-radius: var(--border-radius);
    padding: 30px;
    box-shadow: var(--shadow-light);
    transition: var(--transition);
}

.tool-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-medium);
}

.tool-card h3 {
    font-size: 1.3rem;
    margin-bottom: 15px;
    color: var(--primary-color);
}

.tool-card p {
    color: var(--text-light);
    margin-bottom: 20px;
}

/* ===== 社区帖子 ===== */
.post-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.post-item {
    background: var(--bg-color);
    border-radius: var(--border-radius);
    padding: 25px;
    box-shadow: var(--shadow-light);
    display: flex;
    gap: 20px;
}

.post-avatar {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--gradient-primary);
    flex-shrink: 0;
}

.post-content {
    flex: 1;
}

.post-author {
    font-weight: 600;
    margin-bottom: 5px;
}

.post-text {
    color: var(--text-light);
    margin-bottom: 10px;
}

.post-meta {
    display: flex;
    gap: 20px;
    color: var(--text-light);
    font-size: 0.9rem;
}