/* 51天美蜜桃 - 主样式文件 */

/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #fff;
    font-size: 16px;
}

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

a {
    text-decoration: none;
    color: #FF6B9D;
    transition: all 0.3s ease;
}

a:hover {
    color: #FF4081;
}

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

/* 头部样式 */
header {
    background: linear-gradient(135deg, #FF6B9D 0%, #FFA8C5 100%);
    color: white;
    padding: 15px 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

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

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

.logo img {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: white;
    padding: 5px;
}

.logo h1 {
    font-size: 24px;
    font-weight: 700;
    color: white;
}

/* 导航样式 */
nav ul {
    display: flex;
    list-style: none;
    gap: 30px;
    flex-wrap: wrap;
}

nav ul li a {
    color: white;
    font-weight: 500;
    padding: 8px 15px;
    border-radius: 20px;
    transition: all 0.3s ease;
}

nav ul li a:hover {
    background: rgba(255, 255, 255, 0.2);
}

/* 搜索框 */
.search-container {
    width: 100%;
    max-width: 600px;
    margin: 20px auto;
    padding: 0 20px;
}

.search-box {
    display: flex;
    background: white;
    border-radius: 30px;
    overflow: hidden;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.search-box input {
    flex: 1;
    border: none;
    padding: 12px 20px;
    font-size: 16px;
    outline: none;
}

.search-box button {
    background: linear-gradient(135deg, #FF6B9D 0%, #FFA8C5 100%);
    color: white;
    border: none;
    padding: 12px 30px;
    cursor: pointer;
    font-size: 16px;
    font-weight: 500;
    transition: all 0.3s ease;
}

.search-box button:hover {
    background: linear-gradient(135deg, #FF4081 0%, #FF6B9D 100%);
}

/* 主内容区域 */
main {
    min-height: 60vh;
    padding: 40px 0;
}

/* 英雄区域 */
.hero-section {
    background: linear-gradient(135deg, #FFF0F5 0%, #FFE4E9 100%);
    padding: 60px 0;
    text-align: center;
    margin-bottom: 40px;
}

.hero-section h2 {
    font-size: 42px;
    color: #FF6B9D;
    margin-bottom: 20px;
    font-weight: 700;
}

.hero-section p {
    font-size: 18px;
    color: #666;
    max-width: 800px;
    margin: 0 auto 30px;
}

/* 视频卡片网格 */
.video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 30px;
    margin: 40px 0;
}

.video-card {
    background: white;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    cursor: pointer;
}

.video-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(255, 107, 157, 0.3);
}

.video-thumbnail {
    position: relative;
    width: 100%;
    padding-top: 56.25%;
    overflow: hidden;
    background: #f5f5f5;
}

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

.play-button {
    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-button {
    opacity: 1;
}

.play-button::after {
    content: '';
    width: 0;
    height: 0;
    border-left: 20px solid white;
    border-top: 12px solid transparent;
    border-bottom: 12px solid transparent;
    margin-left: 5px;
}

.video-info {
    padding: 20px;
}

.video-info h3 {
    font-size: 18px;
    color: #333;
    margin-bottom: 10px;
    font-weight: 600;
}

.video-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: #999;
    font-size: 14px;
}

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

/* 内容区块 */
.content-section {
    margin: 60px 0;
}

.section-title {
    font-size: 32px;
    color: #333;
    margin-bottom: 30px;
    font-weight: 700;
    text-align: center;
    position: relative;
    padding-bottom: 15px;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background: linear-gradient(90deg, #FF6B9D, #FFA8C5);
    border-radius: 2px;
}

/* 专家卡片 */
.expert-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 30px;
    margin: 40px 0;
}

.expert-card {
    background: white;
    border-radius: 15px;
    padding: 30px;
    text-align: center;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
}

.expert-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(255, 107, 157, 0.3);
}

.expert-card img {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    margin: 0 auto 20px;
    object-fit: cover;
    border: 4px solid #FFA8C5;
}

.expert-card h3 {
    font-size: 20px;
    color: #333;
    margin-bottom: 10px;
}

.expert-card .title {
    color: #FF6B9D;
    font-weight: 600;
    margin-bottom: 15px;
}

.expert-card p {
    color: #666;
    font-size: 14px;
    line-height: 1.8;
}

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 12px 30px;
    background: linear-gradient(135deg, #FF6B9D 0%, #FFA8C5 100%);
    color: white;
    border-radius: 25px;
    font-weight: 600;
    text-align: center;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
    font-size: 16px;
}

.btn:hover {
    background: linear-gradient(135deg, #FF4081 0%, #FF6B9D 100%);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(255, 107, 157, 0.4);
}

.btn-secondary {
    background: white;
    color: #FF6B9D;
    border: 2px solid #FF6B9D;
}

.btn-secondary:hover {
    background: #FF6B9D;
    color: white;
}

/* 联系信息 */
.contact-info {
    background: linear-gradient(135deg, #FFF0F5 0%, #FFE4E9 100%);
    padding: 40px;
    border-radius: 15px;
    margin: 40px 0;
}

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

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

.contact-item h4 {
    color: #FF6B9D;
    font-size: 18px;
    margin-bottom: 10px;
}

.contact-item p {
    color: #666;
    font-size: 16px;
}

/* 二维码 */
.qr-codes {
    display: flex;
    justify-content: center;
    gap: 50px;
    margin: 40px 0;
    flex-wrap: wrap;
}

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

.qr-item img {
    width: 150px;
    height: 150px;
    margin: 0 auto 15px;
    border: 3px solid #FFA8C5;
    border-radius: 10px;
}

.qr-item p {
    color: #666;
    font-weight: 600;
}

/* 页脚 */
footer {
    background: #333;
    color: white;
    padding: 40px 0 20px;
    margin-top: 60px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    margin-bottom: 30px;
}

.footer-section h3 {
    color: #FFA8C5;
    margin-bottom: 15px;
    font-size: 18px;
}

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

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

.footer-section ul li a {
    color: #ccc;
    transition: color 0.3s ease;
}

.footer-section ul li a:hover {
    color: #FFA8C5;
}

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid #555;
    color: #999;
}

.social-share {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin: 20px 0;
}

.social-share a {
    display: inline-block;
    width: 40px;
    height: 40px;
    background: #555;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    transition: all 0.3s ease;
}

.social-share a:hover {
    background: #FF6B9D;
    transform: translateY(-3px);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        gap: 15px;
    }

    nav ul {
        gap: 15px;
        justify-content: center;
    }

    .hero-section h2 {
        font-size: 32px;
    }

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

    .section-title {
        font-size: 26px;
    }

    .qr-codes {
        gap: 30px;
    }
}

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

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

/* 懒加载占位 */
.lazy-loading {
    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;
    }
}