/* 国产视频 - 原创视频内容平台 CSS样式表 */
/* 网站：kamdmu.cn */

/* ===== 基础重置 ===== */
* {
    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;
    line-height: 1.6;
    color: #333;
    background: #f8f9fa;
}

a {
    text-decoration: none;
    color: inherit;
    transition: color 0.3s ease;
}

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

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

/* ===== 头部导航 ===== */
.header {
    background: linear-gradient(135deg, #ff6b9d 0%, #c44569 50%, #9b59b6 100%);
    padding: 15px 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 20px rgba(0,0,0,0.1);
}

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

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

.logo img {
    width: 45px;
    height: 45px;
    border-radius: 10px;
}

.logo h1 {
    color: #fff;
    font-size: 1.5rem;
    font-weight: 700;
}

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

.nav-menu a {
    color: #fff;
    font-weight: 500;
    padding: 8px 15px;
    border-radius: 20px;
    transition: all 0.3s ease;
}

.nav-menu a:hover,
.nav-menu a.active {
    background: rgba(255,255,255,0.2);
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: #fff;
    font-size: 1.5rem;
    cursor: pointer;
}

/* ===== 搜索框 ===== */
.search-bar {
    background: #fff;
    padding: 15px 0;
    border-bottom: 1px solid #eee;
}

.search-container {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 10px;
}

.search-input {
    width: 100%;
    max-width: 500px;
    padding: 12px 20px;
    border: 2px solid #ff6b9d;
    border-radius: 25px;
    font-size: 1rem;
    outline: none;
    transition: all 0.3s ease;
}

.search-input:focus {
    border-color: #c44569;
    box-shadow: 0 0 10px rgba(255,107,157,0.3);
}

.search-btn {
    background: linear-gradient(135deg, #ff6b9d, #c44569);
    color: #fff;
    border: none;
    padding: 12px 25px;
    border-radius: 25px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.3s ease;
}

.search-btn:hover {
    transform: scale(1.05);
    box-shadow: 0 5px 15px rgba(255,107,157,0.4);
}

/* ===== Hero区域 ===== */
.hero {
    background: linear-gradient(135deg, rgba(255,107,157,0.9), rgba(155,89,182,0.9)), url('../images/hero-bg.jpg') center/cover;
    padding: 80px 0;
    text-align: center;
    color: #fff;
}

.hero h2 {
    font-size: 2.8rem;
    margin-bottom: 20px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.2);
}

.hero p {
    font-size: 1.2rem;
    max-width: 700px;
    margin: 0 auto 30px;
    opacity: 0.95;
}

.hero-btns {
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
}

.btn {
    padding: 15px 35px;
    border-radius: 30px;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    border: none;
}

.btn-primary {
    background: #fff;
    color: #c44569;
}

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

.btn-secondary {
    background: transparent;
    color: #fff;
    border: 2px solid #fff;
}

.btn-secondary:hover {
    background: #fff;
    color: #c44569;
}

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

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

.section-header h2 {
    font-size: 2rem;
    color: #333;
    margin-bottom: 10px;
}

.section-header p {
    color: #666;
    font-size: 1.1rem;
}

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

.video-card {
    background: #fff;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 5px 20px rgba(0,0,0,0.08);
    transition: all 0.3s ease;
    cursor: pointer;
}

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

.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: transform 0.5s ease;
}

.video-card:hover .video-thumbnail img {
    transform: scale(1.1);
}

.play-btn {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 60px;
    height: 60px;
    background: rgba(255,107,157,0.9);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: all 0.3s ease;
}

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

.play-btn::after {
    content: "";
    width: 0;
    height: 0;
    border-left: 20px solid #fff;
    border-top: 12px solid transparent;
    border-bottom: 12px solid transparent;
    margin-left: 5px;
}

.video-duration {
    position: absolute;
    bottom: 10px;
    right: 10px;
    background: rgba(0,0,0,0.7);
    color: #fff;
    padding: 3px 8px;
    border-radius: 4px;
    font-size: 0.85rem;
}

.video-info {
    padding: 15px;
}

.video-info h3 {
    font-size: 1rem;
    margin-bottom: 10px;
    color: #333;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.video-meta {
    display: flex;
    justify-content: space-between;
    color: #999;
    font-size: 0.85rem;
}

.video-stats {
    display: flex;
    gap: 15px;
}

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

/* ===== 专家展示 ===== */
.experts-section {
    padding: 60px 0;
    background: linear-gradient(135deg, #f8f9fa 0%, #fff 100%);
}

.experts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 30px;
}

.expert-card {
    background: #fff;
    border-radius: 20px;
    padding: 30px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.08);
    display: flex;
    gap: 20px;
    transition: all 0.3s ease;
}

.expert-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 50px rgba(0,0,0,0.12);
}

.expert-avatar {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    object-fit: cover;
    border: 4px solid #ff6b9d;
}

.expert-info h3 {
    color: #333;
    margin-bottom: 5px;
}

.expert-title {
    color: #ff6b9d;
    font-size: 0.9rem;
    margin-bottom: 10px;
}

.expert-desc {
    color: #666;
    font-size: 0.9rem;
    margin-bottom: 15px;
}

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

.expert-btns .btn {
    padding: 8px 20px;
    font-size: 0.85rem;
}

/* ===== 社区功能 ===== */
.community-section {
    padding: 60px 0;
    background: #fff;
}

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

.community-card {
    background: linear-gradient(135deg, #ff6b9d 0%, #c44569 100%);
    border-radius: 20px;
    padding: 30px;
    color: #fff;
    text-align: center;
    transition: all 0.3s ease;
}

.community-card:hover {
    transform: scale(1.05);
}

.community-icon {
    font-size: 3rem;
    margin-bottom: 15px;
}

.community-card h3 {
    margin-bottom: 10px;
}

.community-card p {
    opacity: 0.9;
    font-size: 0.9rem;
}

/* ===== AI赋能 ===== */
.ai-section {
    padding: 60px 0;
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
    color: #fff;
}

.ai-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 30px;
}

.ai-card {
    background: rgba(255,255,255,0.1);
    border-radius: 20px;
    padding: 30px;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255,255,255,0.1);
    transition: all 0.3s ease;
}

.ai-card:hover {
    background: rgba(255,255,255,0.15);
    transform: translateY(-5px);
}

.ai-card h3 {
    color: #ff6b9d;
    margin-bottom: 15px;
}

.ai-card p {
    opacity: 0.9;
    line-height: 1.8;
}

/* ===== 用户评价 ===== */
.reviews-section {
    padding: 60px 0;
    background: #f8f9fa;
}

.reviews-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 25px;
}

.review-card {
    background: #fff;
    border-radius: 15px;
    padding: 25px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.05);
}

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

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

.review-user h4 {
    color: #333;
    margin-bottom: 3px;
}

.review-rating {
    color: #ffc107;
}

.review-content {
    color: #666;
    line-height: 1.8;
}

/* ===== 合作伙伴 ===== */
.partners-section {
    padding: 60px 0;
    background: #fff;
    text-align: center;
}

.partners-logos {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 40px;
    margin-top: 30px;
}

.partners-logos img {
    height: 60px;
    opacity: 0.7;
    transition: opacity 0.3s ease;
}

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

/* ===== 联系我们 ===== */
.contact-section {
    padding: 60px 0;
    background: linear-gradient(135deg, #f8f9fa 0%, #fff 100%);
}

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

.contact-card {
    background: #fff;
    border-radius: 20px;
    padding: 30px;
    text-align: center;
    box-shadow: 0 10px 30px rgba(0,0,0,0.08);
}

.contact-card h3 {
    color: #333;
    margin-bottom: 15px;
}

.contact-card p {
    color: #666;
    margin-bottom: 10px;
}

.contact-card img {
    max-width: 150px;
    margin-top: 15px;
    border-radius: 10px;
}

/* ===== FAQ ===== */
.faq-section {
    padding: 60px 0;
    background: #fff;
}

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

.faq-item {
    background: #f8f9fa;
    border-radius: 15px;
    margin-bottom: 15px;
    overflow: hidden;
}

.faq-question {
    padding: 20px 25px;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 600;
    color: #333;
}

.faq-question:hover {
    background: #f0f0f0;
}

.faq-answer {
    padding: 0 25px 20px;
    color: #666;
    line-height: 1.8;
    display: none;
}

.faq-item.active .faq-answer {
    display: block;
}

/* ===== 页脚 ===== */
.footer {
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
    color: #fff;
    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 {
    color: #ff6b9d;
    margin-bottom: 20px;
    font-size: 1.1rem;
}

.footer-col p {
    opacity: 0.8;
    line-height: 1.8;
    margin-bottom: 10px;
}

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

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

.footer-col ul li a {
    opacity: 0.8;
    transition: all 0.3s ease;
}

.footer-col ul li a:hover {
    opacity: 1;
    color: #ff6b9d;
}

.footer-col img {
    max-width: 120px;
    border-radius: 10px;
}

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.1);
    padding-top: 30px;
    text-align: center;
    opacity: 0.8;
}

.social-links {
    display: flex;
    gap: 15px;
    margin-top: 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;
    transition: all 0.3s ease;
}

.social-links a:hover {
    background: #ff6b9d;
}

/* ===== 面包屑 ===== */
.breadcrumb {
    background: #f8f9fa;
    padding: 15px 0;
    border-bottom: 1px solid #eee;
}

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

.breadcrumb-list li::after {
    content: ">";
    margin-left: 10px;
    color: #999;
}

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

.breadcrumb-list a {
    color: #666;
}

.breadcrumb-list a:hover {
    color: #ff6b9d;
}

/* ===== 内页样式 ===== */
.page-header {
    background: linear-gradient(135deg, rgba(255,107,157,0.9), rgba(155,89,182,0.9)), url('../images/hero-bg.jpg') center/cover;
    padding: 60px 0;
    text-align: center;
    color: #fff;
}

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

.page-header p {
    font-size: 1.1rem;
    opacity: 0.9;
}

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

/* ===== 工具卡片 ===== */
.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 30px;
}

.tool-card {
    background: #fff;
    border-radius: 20px;
    padding: 30px;
    text-align: center;
    box-shadow: 0 10px 30px rgba(0,0,0,0.08);
    transition: all 0.3s ease;
}

.tool-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 50px rgba(0,0,0,0.15);
}

.tool-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, #ff6b9d, #c44569);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    font-size: 2rem;
    color: #fff;
}

.tool-card h3 {
    color: #333;
    margin-bottom: 15px;
}

.tool-card p {
    color: #666;
    line-height: 1.8;
}

/* ===== 响应式设计 ===== */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: linear-gradient(135deg, #ff6b9d 0%, #c44569 100%);
        flex-direction: column;
        padding: 20px;
        gap: 10px;
    }

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

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

    .hero h2 {
        font-size: 2rem;
    }

    .hero p {
        font-size: 1rem;
    }

    .hero-btns {
        flex-direction: column;
        align-items: center;
    }

    .section-header h2 {
        font-size: 1.5rem;
    }

    .expert-card {
        flex-direction: column;
        text-align: center;
    }

    .expert-avatar {
        margin: 0 auto;
    }

    .expert-btns {
        justify-content: center;
    }

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

    .social-links {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }

    .hero {
        padding: 50px 0;
    }

    .hero h2 {
        font-size: 1.6rem;
    }

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

    .experts-grid,
    .reviews-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: #f0f0f0;
    transition: opacity 0.3s ease;
}

.lazy-load.loaded {
    background: transparent;
}