/* 
 * 四虎 - 全新原创样式表
 * 域名: tkvhvj.cn
 * 定位: 国内影视传媒公司+视频社区
 * 版本: 2.0
 */

/* ========== CSS变量定义 ========== */
:root {
    --primary-color: #e91e63;
    --primary-dark: #c2185b;
    --primary-light: #f8bbd9;
    --secondary-color: #9c27b0;
    --accent-color: #ff4081;
    --text-dark: #212121;
    --text-light: #757575;
    --text-white: #ffffff;
    --bg-light: #fafafa;
    --bg-dark: #1a1a2e;
    --bg-gradient: linear-gradient(135deg, #e91e63 0%, #9c27b0 100%);
    --card-shadow: 0 4px 20px rgba(0,0,0,0.1);
    --card-hover-shadow: 0 8px 30px rgba(233,30,99,0.3);
    --border-radius: 12px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ========== 重置样式 ========== */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--bg-light);
    overflow-x: hidden;
}

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

ul, ol {
    list-style: none;
}

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

/* ========== 通用容器 ========== */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.section {
    padding: 80px 0;
}

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

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 15px;
    position: relative;
    display: inline-block;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: var(--bg-gradient);
    border-radius: 2px;
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--text-light);
    max-width: 600px;
    margin: 20px auto 0;
}

/* ========== 顶部导航栏 ========== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255,255,255,0.98);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 20px rgba(0,0,0,0.08);
    transition: var(--transition);
}

.header.scrolled {
    background: rgba(255,255,255,0.95);
    box-shadow: 0 4px 30px rgba(0,0,0,0.12);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

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

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

.logo-text {
    font-size: 1.5rem;
    font-weight: 700;
    background: var(--bg-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 35px;
}

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

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

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

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

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 10px;
}

.mobile-menu-btn span {
    width: 25px;
    height: 3px;
    background: var(--text-dark);
    border-radius: 2px;
    transition: var(--transition);
}

/* ========== 搜索框 ========== */
.search-bar {
    background: linear-gradient(135deg, #f5f5f5 0%, #eeeeee 100%);
    padding: 15px 0;
    margin-top: 70px;
}

.search-container {
    display: flex;
    align-items: center;
    max-width: 600px;
    margin: 0 auto;
    background: #fff;
    border-radius: 50px;
    padding: 5px;
    box-shadow: 0 2px 15px rgba(0,0,0,0.08);
}

.search-input {
    flex: 1;
    border: none;
    outline: none;
    padding: 12px 20px;
    font-size: 1rem;
    background: transparent;
    color: var(--text-dark);
}

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

.search-btn {
    background: var(--bg-gradient);
    border: none;
    padding: 12px 30px;
    border-radius: 50px;
    color: #fff;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.search-btn:hover {
    transform: scale(1.05);
    box-shadow: 0 4px 15px rgba(233,30,99,0.4);
}

/* ========== 面包屑导航 ========== */
.breadcrumb {
    background: #fff;
    padding: 15px 0;
    border-bottom: 1px solid #eee;
}

.breadcrumb-list {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.9rem;
}

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

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

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

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

/* ========== 轮播图/Hero区域 ========== */
.hero {
    position: relative;
    height: 600px;
    overflow: hidden;
    margin-top: 70px;
}

.hero-slider {
    position: relative;
    height: 100%;
}

.hero-slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    transition: opacity 0.8s ease;
}

.hero-slide.active {
    opacity: 1;
}

.hero-slide img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(233,30,99,0.7) 0%, rgba(156,39,176,0.7) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-content {
    text-align: center;
    color: #fff;
    max-width: 800px;
    padding: 0 20px;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: 20px;
    text-shadow: 0 4px 20px rgba(0,0,0,0.3);
}

.hero-subtitle {
    font-size: 1.3rem;
    margin-bottom: 30px;
    opacity: 0.95;
}

.hero-btn {
    display: inline-block;
    background: #fff;
    color: var(--primary-color);
    padding: 15px 40px;
    border-radius: 50px;
    font-size: 1.1rem;
    font-weight: 600;
    transition: var(--transition);
}

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

.hero-dots {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 12px;
}

.hero-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: rgba(255,255,255,0.5);
    cursor: pointer;
    transition: var(--transition);
}

.hero-dot.active {
    background: #fff;
    transform: scale(1.2);
}

/* ========== 视频卡片网格 ========== */
.video-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 25px;
}

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

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

.video-thumbnail {
    position: relative;
    aspect-ratio: 16/9;
    overflow: hidden;
}

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

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

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

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

.video-play-btn::before {
    content: '';
    width: 0;
    height: 0;
    border-left: 18px solid #fff;
    border-top: 11px solid transparent;
    border-bottom: 11px solid transparent;
    margin-left: 4px;
}

.video-duration {
    position: absolute;
    bottom: 10px;
    right: 10px;
    background: rgba(0,0,0,0.75);
    color: #fff;
    padding: 3px 8px;
    border-radius: 4px;
    font-size: 0.8rem;
    font-weight: 500;
}

.video-info {
    padding: 15px;
}

.video-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 10px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    line-height: 1.4;
}

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

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

.video-tag {
    background: var(--primary-light);
    color: var(--primary-dark);
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 0.75rem;
}

/* ========== 服务模块 ========== */
.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.service-card {
    background: #fff;
    border-radius: var(--border-radius);
    padding: 40px 30px;
    text-align: center;
    box-shadow: var(--card-shadow);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--bg-gradient);
    transform: scaleX(0);
    transition: var(--transition);
}

.service-card:hover::before {
    transform: scaleX(1);
}

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

.service-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 25px;
    background: var(--bg-gradient);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: #fff;
}

.service-title {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 15px;
}

.service-desc {
    font-size: 0.95rem;
    color: var(--text-light);
    line-height: 1.7;
}

/* ========== 专家团队 ========== */
.experts-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

.expert-card {
    background: #fff;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--card-shadow);
    transition: var(--transition);
    text-align: center;
}

.expert-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--card-hover-shadow);
}

.expert-avatar {
    width: 100%;
    aspect-ratio: 1;
    overflow: hidden;
}

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

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

.expert-info {
    padding: 25px 20px;
}

.expert-name {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 8px;
}

.expert-title {
    font-size: 0.9rem;
    color: var(--primary-color);
    margin-bottom: 12px;
}

.expert-desc {
    font-size: 0.85rem;
    color: var(--text-light);
    line-height: 1.6;
    margin-bottom: 15px;
}

.expert-social {
    display: flex;
    justify-content: center;
    gap: 15px;
}

.expert-social a {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--bg-light);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-light);
    transition: var(--transition);
}

.expert-social a:hover {
    background: var(--bg-gradient);
    color: #fff;
}

/* ========== 社区功能 ========== */
.community-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
}

.community-card {
    background: #fff;
    border-radius: var(--border-radius);
    padding: 30px;
    display: flex;
    gap: 25px;
    box-shadow: var(--card-shadow);
    transition: var(--transition);
}

.community-card:hover {
    transform: translateX(10px);
    box-shadow: var(--card-hover-shadow);
}

.community-icon {
    width: 70px;
    height: 70px;
    flex-shrink: 0;
    background: var(--bg-gradient);
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    color: #fff;
}

.community-content h3 {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 10px;
}

.community-content p {
    font-size: 0.95rem;
    color: var(--text-light);
    line-height: 1.6;
}

/* ========== 用户评价 ========== */
.testimonials {
    background: var(--bg-dark);
    color: #fff;
}

.testimonials .section-title {
    color: #fff;
}

.testimonials .section-subtitle {
    color: rgba(255,255,255,0.7);
}

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

.testimonial-card {
    background: rgba(255,255,255,0.08);
    border-radius: var(--border-radius);
    padding: 30px;
    backdrop-filter: blur(10px);
    transition: var(--transition);
}

.testimonial-card:hover {
    background: rgba(255,255,255,0.12);
    transform: translateY(-5px);
}

.testimonial-content {
    font-size: 1rem;
    line-height: 1.7;
    margin-bottom: 20px;
    opacity: 0.9;
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: 15px;
}

.testimonial-avatar {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    overflow: hidden;
}

.testimonial-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.testimonial-name {
    font-weight: 600;
    margin-bottom: 3px;
}

.testimonial-role {
    font-size: 0.85rem;
    opacity: 0.7;
}

/* ========== FAQ ========== */
.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background: #fff;
    border-radius: var(--border-radius);
    margin-bottom: 15px;
    box-shadow: var(--card-shadow);
    overflow: hidden;
}

.faq-question {
    padding: 20px 25px;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-dark);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: var(--transition);
}

.faq-question:hover {
    color: var(--primary-color);
}

.faq-icon {
    font-size: 1.5rem;
    transition: var(--transition);
}

.faq-item.active .faq-icon {
    transform: rotate(45deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.faq-item.active .faq-answer {
    max-height: 500px;
}

.faq-answer-content {
    padding: 0 25px 20px;
    font-size: 0.95rem;
    color: var(--text-light);
    line-height: 1.7;
}

/* ========== 合作品牌 ========== */
.partners-grid {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 30px;
    align-items: center;
}

.partner-logo {
    background: #fff;
    border-radius: var(--border-radius);
    padding: 25px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--card-shadow);
    transition: var(--transition);
    filter: grayscale(100%);
    opacity: 0.6;
}

.partner-logo:hover {
    filter: grayscale(0%);
    opacity: 1;
    transform: scale(1.05);
}

/* ========== 联系我们 ========== */
.contact-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 50px;
}

.contact-info h3 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 25px;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 15px;
    margin-bottom: 20px;
}

.contact-icon {
    width: 45px;
    height: 45px;
    flex-shrink: 0;
    background: var(--bg-gradient);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
}

.contact-text strong {
    display: block;
    font-size: 1rem;
    color: var(--text-dark);
    margin-bottom: 5px;
}

.contact-text span {
    font-size: 0.95rem;
    color: var(--text-light);
}

.contact-qr {
    display: flex;
    gap: 30px;
    margin-top: 30px;
}

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

.qr-item img {
    width: 120px;
    height: 120px;
    border-radius: var(--border-radius);
    margin-bottom: 10px;
}

.qr-item span {
    font-size: 0.9rem;
    color: var(--text-light);
}

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

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 50px;
    margin-bottom: 40px;
}

.footer-brand .logo {
    margin-bottom: 20px;
}

.footer-brand .logo-text {
    color: #fff;
    background: none;
    -webkit-text-fill-color: #fff;
}

.footer-brand p {
    font-size: 0.95rem;
    opacity: 0.8;
    line-height: 1.7;
    margin-bottom: 20px;
}

.footer-social {
    display: flex;
    gap: 12px;
}

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

.footer-social a:hover {
    background: var(--bg-gradient);
}

.footer-links h4 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 20px;
}

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

.footer-links ul li a {
    font-size: 0.95rem;
    opacity: 0.8;
    transition: var(--transition);
}

.footer-links ul li a:hover {
    opacity: 1;
    color: var(--primary-light);
}

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.1);
    padding-top: 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.9rem;
    opacity: 0.7;
}

/* ========== 响应式设计 ========== */
@media (max-width: 1024px) {
    .video-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .experts-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .services-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .nav-menu {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        right: 0;
        background: #fff;
        flex-direction: column;
        padding: 20px;
        gap: 15px;
        box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    }
    
    .nav-menu.active {
        display: flex;
    }
    
    .mobile-menu-btn {
        display: flex;
    }
    
    .hero {
        height: 500px;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .video-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 15px;
    }
    
    .services-grid,
    .community-grid,
    .testimonials-grid {
        grid-template-columns: 1fr;
    }
    
    .experts-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
    }
    
    .partners-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: 15px;
        text-align: center;
    }
    
    .section {
        padding: 50px 0;
    }
    
    .section-title {
        font-size: 2rem;
    }
}

@media (max-width: 480px) {
    .video-grid {
        grid-template-columns: 1fr;
    }
    
    .experts-grid {
        grid-template-columns: 1fr;
    }
    
    .hero {
        height: 400px;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .contact-qr {
        flex-direction: column;
        align-items: center;
    }
}

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

.animate-fadeInUp {
    animation: fadeInUp 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: shimmer 1.5s infinite;
}

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

/* ========== 内页特定样式 ========== */
.page-header {
    background: var(--bg-gradient);
    padding: 100px 0 60px;
    margin-top: 70px;
    text-align: center;
    color: #fff;
}

.page-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 15px;
}

.page-desc {
    font-size: 1.1rem;
    opacity: 0.9;
    max-width: 600px;
    margin: 0 auto;
}

/* ========== 分类标签 ========== */
.category-tabs {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.category-tab {
    padding: 10px 25px;
    border-radius: 50px;
    background: #fff;
    color: var(--text-dark);
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    border: 2px solid transparent;
}

.category-tab:hover,
.category-tab.active {
    background: var(--bg-gradient);
    color: #fff;
}

/* ========== 加载更多按钮 ========== */
.load-more {
    text-align: center;
    margin-top: 40px;
}

.load-more-btn {
    display: inline-block;
    padding: 15px 50px;
    background: var(--bg-gradient);
    color: #fff;
    border-radius: 50px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    border: none;
}

.load-more-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(233,30,99,0.3);
}