/* 国产视频 品牌网站样式表 */
/* 版权所有 ©2025 国产视频 cmjdyr.cn */

/* ===== 基础重置与变量 ===== */
:root {
    --primary-color: #ff6b9d;
    --primary-dark: #e84a7f;
    --secondary-color: #7c3aed;
    --accent-color: #fbbf24;
    --text-color: #1f2937;
    --text-light: #6b7280;
    --bg-color: #ffffff;
    --bg-light: #f9fafb;
    --bg-dark: #111827;
    --border-color: #e5e7eb;
    --shadow: 0 4px 6px -1px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1);
    --radius: 12px;
    --radius-lg: 20px;
    --transition: all 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-color);
    background: var(--bg-color);
}

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

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

/* ===== 头部导航 ===== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255,255,255,0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow);
}

.header-inner {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

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

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

.logo-text {
    font-size: 22px;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 8px;
}

.nav-menu a {
    padding: 10px 18px;
    border-radius: var(--radius);
    font-weight: 500;
    color: var(--text-color);
}

.nav-menu a:hover,
.nav-menu a.active {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: #fff;
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
}

/* ===== 搜索框 ===== */
.search-bar {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    padding: 15px 0;
    margin-top: 70px;
}

.search-container {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 20px;
}

.search-wrapper {
    display: flex;
    background: #fff;
    border-radius: 50px;
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.search-wrapper input {
    flex: 1;
    padding: 15px 25px;
    border: none;
    font-size: 16px;
    outline: none;
}

.search-wrapper button {
    padding: 15px 30px;
    background: var(--primary-color);
    border: none;
    color: #fff;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.search-wrapper button:hover {
    background: var(--primary-dark);
}

/* ===== 轮播图 ===== */
.hero-banner {
    position: relative;
    height: 500px;
    overflow: hidden;
}

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

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

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

.banner-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(255,107,157,0.7), rgba(124,58,237,0.7));
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: #fff;
}

.banner-content h1 {
    font-size: 48px;
    font-weight: 800;
    margin-bottom: 20px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

.banner-content p {
    font-size: 20px;
    margin-bottom: 30px;
    opacity: 0.95;
}

.btn-primary {
    display: inline-block;
    padding: 15px 40px;
    background: #fff;
    color: var(--primary-color);
    border-radius: 50px;
    font-weight: 600;
    font-size: 18px;
    box-shadow: var(--shadow-lg);
    transition: var(--transition);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 30px rgba(0,0,0,0.2);
}

.banner-dots {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 10px;
}

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

.banner-dots span.active {
    background: #fff;
    transform: scale(1.2);
}

/* ===== 通用容器 ===== */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
}

.section {
    padding: 80px 0;
}

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

.section-header h2 {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 15px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-header p {
    font-size: 18px;
    color: var(--text-light);
}

/* ===== 视频卡片网格 ===== */
.video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 25px;
}

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

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

.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(1.05);
}

.play-btn {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0);
    width: 70px;
    height: 70px;
    background: rgba(255,107,157,0.9);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.play-btn::after {
    content: '';
    width: 0;
    height: 0;
    border-left: 22px solid #fff;
    border-top: 14px solid transparent;
    border-bottom: 14px solid transparent;
    margin-left: 5px;
}

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

.video-duration {
    position: absolute;
    bottom: 10px;
    right: 10px;
    background: rgba(0,0,0,0.8);
    color: #fff;
    padding: 4px 10px;
    border-radius: 5px;
    font-size: 13px;
    font-weight: 500;
}

.video-info {
    padding: 20px;
}

.video-info h3 {
    font-size: 17px;
    font-weight: 600;
    margin-bottom: 10px;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.video-meta {
    display: flex;
    align-items: center;
    gap: 15px;
    color: var(--text-light);
    font-size: 14px;
}

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

/* ===== 服务模块 ===== */
.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 30px;
}

.service-card {
    background: linear-gradient(135deg, #fff, var(--bg-light));
    border-radius: var(--radius-lg);
    padding: 35px;
    text-align: center;
    box-shadow: var(--shadow);
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

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

.service-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 20px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 36px;
    color: #fff;
}

.service-card h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-color);
}

.service-card p {
    color: var(--text-light);
    font-size: 15px;
    line-height: 1.7;
}

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

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

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

.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;
    text-align: center;
}

.expert-info h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 8px;
}

.expert-title {
    color: var(--primary-color);
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 12px;
}

.expert-desc {
    color: var(--text-light);
    font-size: 14px;
    line-height: 1.6;
    margin-bottom: 15px;
}

.expert-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    justify-content: center;
}

.expert-tags span {
    padding: 5px 12px;
    background: var(--bg-light);
    border-radius: 20px;
    font-size: 12px;
    color: var(--text-light);
}

/* ===== 用户评价 ===== */
.testimonial-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 30px;
}

.testimonial-card {
    background: #fff;
    border-radius: var(--radius-lg);
    padding: 30px;
    box-shadow: var(--shadow);
    border-left: 4px solid var(--primary-color);
}

.testimonial-content {
    font-size: 16px;
    line-height: 1.8;
    color: var(--text-color);
    margin-bottom: 20px;
    font-style: italic;
}

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

.testimonial-author img {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    object-fit: cover;
}

.author-info h4 {
    font-size: 16px;
    font-weight: 600;
}

.author-info span {
    font-size: 13px;
    color: var(--text-light);
}

/* ===== FAQ ===== */
.faq-list {
    max-width: 900px;
    margin: 0 auto;
}

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

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

.faq-question:hover {
    background: var(--bg-light);
}

.faq-question::after {
    content: '+';
    font-size: 24px;
    color: var(--primary-color);
    transition: var(--transition);
}

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

.faq-answer {
    padding: 0 25px;
    max-height: 0;
    overflow: hidden;
    transition: all 0.3s ease;
}

.faq-item.active .faq-answer {
    padding: 0 25px 20px;
    max-height: 500px;
}

.faq-answer p {
    color: var(--text-light);
    line-height: 1.8;
}

/* ===== 联系我们 ===== */
.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 30px;
}

.contact-card {
    background: #fff;
    border-radius: var(--radius-lg);
    padding: 30px;
    text-align: center;
    box-shadow: var(--shadow);
}

.contact-card h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 20px;
    color: var(--primary-color);
}

.contact-card img {
    width: 150px;
    height: 150px;
    margin: 0 auto 15px;
    border-radius: var(--radius);
}

.contact-card p {
    color: var(--text-light);
    font-size: 14px;
}

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

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-col h4 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 20px;
    color: var(--primary-color);
}

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

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

.footer-col ul li a {
    color: rgba(255,255,255,0.7);
    font-size: 14px;
    transition: var(--transition);
}

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

.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 15px;
}

.footer-logo img {
    height: 40px;
}

.footer-logo span {
    font-size: 20px;
    font-weight: 700;
}

.footer-desc {
    color: rgba(255,255,255,0.7);
    font-size: 14px;
    line-height: 1.8;
    margin-bottom: 20px;
}

.social-links {
    display: flex;
    gap: 15px;
}

.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;
    font-size: 18px;
    transition: var(--transition);
}

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

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

.footer-bottom p {
    color: rgba(255,255,255,0.6);
    font-size: 14px;
    margin-bottom: 10px;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
}

.footer-links a {
    color: rgba(255,255,255,0.6);
    font-size: 13px;
}

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

/* ===== 面包屑导航 ===== */
.breadcrumb {
    background: var(--bg-light);
    padding: 15px 0;
    margin-top: 70px;
}

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

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

.breadcrumb-list li:last-child::after {
    display: none;
}

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

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

.breadcrumb-list li:last-child {
    color: var(--primary-color);
    font-weight: 500;
}

/* ===== 响应式设计 ===== */
@media (max-width: 992px) {
    .nav-menu {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        right: 0;
        background: #fff;
        flex-direction: column;
        padding: 20px;
        box-shadow: var(--shadow);
    }

    .nav-menu.active {
        display: flex;
    }

    .mobile-menu-btn {
        display: block;
    }

    .hero-banner {
        height: 400px;
    }

    .banner-content h1 {
        font-size: 32px;
    }

    .section-header h2 {
        font-size: 28px;
    }
}

@media (max-width: 768px) {
    .hero-banner {
        height: 350px;
    }

    .banner-content h1 {
        font-size: 26px;
    }

    .banner-content p {
        font-size: 16px;
    }

    .section {
        padding: 50px 0;
    }

    .video-grid,
    .services-grid,
    .expert-grid {
        grid-template-columns: 1fr;
    }

    .testimonial-grid {
        grid-template-columns: 1fr;
    }

    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    .header-inner {
        height: 60px;
    }

    .logo img {
        height: 35px;
    }

    .logo-text {
        font-size: 18px;
    }

    .search-bar {
        margin-top: 60px;
    }

    .breadcrumb {
        margin-top: 60px;
    }

    .footer-grid {
        grid-template-columns: 1fr;
    }
}

/* ===== 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; }
}