/* 字母圈 - 兴趣社区交流平台样式表 */
/* yxslyc.cn */

/* CSS Reset & Base */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{font-size:16px;scroll-behavior:smooth}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,"PingFang SC","Microsoft YaHei",sans-serif;line-height:1.6;color:#333;background:#fff}
img{max-width:100%;height:auto;display:block}
a{color:#ff6b9d;text-decoration:none;transition:color .3s}
a:hover{color:#ff4081}
ul,ol{list-style:none}

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

/* Header */
.header{background:linear-gradient(135deg,#ff6b9d 0%,#c44569 100%);padding:15px 0;position:sticky;top:0;z-index:1000;box-shadow:0 2px 10px rgba(0,0,0,.1)}
.header-inner{display:flex;align-items:center;justify-content:space-between}
.logo{display:flex;align-items:center;gap:10px}
.logo img{width:50px;height:50px;border-radius:50%;object-fit:cover}
.logo-text{color:#fff;font-size:1.5rem;font-weight:700}
.nav-menu{display:flex;gap:25px}
.nav-menu a{color:#fff;font-weight:500;padding:8px 15px;border-radius:20px;transition:background .3s}
.nav-menu a:hover,.nav-menu a.active{background:rgba(255,255,255,.2);color:#fff}
.mobile-menu-btn{display:none;flex-direction:column;gap:5px;cursor:pointer}
.mobile-menu-btn span{width:25px;height:3px;background:#fff;border-radius:2px;transition:transform .3s}

/* Search Box */
.search-box{background:#f8f9fa;padding:20px 0}
.search-wrapper{display:flex;max-width:600px;margin:0 auto}
.search-input{flex:1;padding:12px 20px;border:2px solid #ff6b9d;border-right:none;border-radius:30px 0 0 30px;font-size:1rem;outline:none}
.search-input:focus{border-color:#c44569}
.search-btn{padding:12px 25px;background:linear-gradient(135deg,#ff6b9d,#c44569);color:#fff;border:none;border-radius:0 30px 30px 0;cursor:pointer;transition:transform .2s}
.search-btn:hover{transform:scale(1.05)}
.search-btn svg{width:20px;height:20px;fill:#fff}

/* Hero Section */
.hero{position:relative;height:500px;overflow:hidden}
.hero-bg{width:100%;height:100%;object-fit:cover;position:absolute;top:0;left:0}
.hero-overlay{position:absolute;top:0;left:0;width:100%;height:100%;background:linear-gradient(135deg,rgba(255,107,157,.8),rgba(196,69,105,.8))}
.hero-content{position:relative;z-index:1;height:100%;display:flex;flex-direction:column;justify-content:center;align-items:center;text-align:center;color:#fff}
.hero-content h1{font-size:2.8rem;margin-bottom:20px;text-shadow:2px 2px 4px rgba(0,0,0,.3)}
.hero-content p{font-size:1.2rem;max-width:700px;margin-bottom:30px;opacity:.95}
.btn{display:inline-block;padding:14px 35px;border-radius:30px;font-weight:600;transition:all .3s;cursor:pointer}
.btn-primary{background:#fff;color:#ff6b9d}
.btn-primary:hover{background:#ff6b9d;color:#fff;transform:translateY(-2px)}
.btn-outline{border:2px solid #fff;color:#fff;background:transparent}
.btn-outline:hover{background:#fff;color:#ff6b9d}

/* Section */
.section{padding:60px 0}
.section-alt{background:#f8f9fa}
.section-header{text-align:center;margin-bottom:50px}
.section-header h2{font-size:2rem;color:#333;margin-bottom:15px;position:relative;display:inline-block}
.section-header h2::after{content:'';position:absolute;bottom:-10px;left:50%;transform:translateX(-50%);width:60px;height:3px;background:linear-gradient(90deg,#ff6b9d,#c44569);border-radius:2px}
.section-header p{color:#666;font-size:1.1rem;max-width:600px;margin:20px auto 0}

/* Video Grid */
.video-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:25px}
.video-card{background:#fff;border-radius:15px;overflow:hidden;box-shadow:0 5px 20px rgba(0,0,0,.08);transition:transform .3s,box-shadow .3s;cursor:pointer}
.video-card:hover{transform:translateY(-8px);box-shadow:0 15px 40px rgba(255,107,157,.2)}
.video-thumb{position:relative;padding-top:56.25%;overflow:hidden}
.video-thumb img{position:absolute;top:0;left:0;width:100%;height:100%;object-fit:cover;transition:transform .5s}
.video-card:hover .video-thumb 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,.9);border-radius:50%;display:flex;align-items:center;justify-content:center;opacity:0;transition:opacity .3s}
.video-card:hover .play-btn{opacity:1}
.play-btn svg{width:24px;height:24px;fill:#fff;margin-left:4px}
.video-duration{position:absolute;bottom:10px;right:10px;background:rgba(0,0,0,.7);color:#fff;padding:3px 8px;border-radius:4px;font-size:.85rem}
.video-tags{position:absolute;top:10px;left:10px;display:flex;gap:5px;flex-wrap:wrap}
.tag{background:rgba(255,107,157,.9);color:#fff;padding:3px 10px;border-radius:15px;font-size:.75rem}
.video-info{padding:15px}
.video-title{font-size:1rem;color:#333;margin-bottom:8px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.video-meta{display:flex;gap:15px;color:#999;font-size:.85rem}

/* Feature Grid */
.feature-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:25px}
.feature-card{background:#fff;padding:30px;border-radius:15px;text-align:center;box-shadow:0 5px 20px rgba(0,0,0,.05);transition:transform .3s}
.feature-card:hover{transform:translateY(-5px)}
.feature-icon{width:70px;height:70px;margin:0 auto 20px;background:linear-gradient(135deg,#ff6b9d,#c44569);border-radius:50%;display:flex;align-items:center;justify-content:center}
.feature-icon svg{width:32px;height:32px;fill:#fff}
.feature-card h3{font-size:1.2rem;color:#333;margin-bottom:10px}
.feature-card p{color:#666;font-size:.95rem;line-height:1.7}

/* Expert Grid */
.expert-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:30px}
.expert-card{background:#fff;border-radius:15px;overflow:hidden;box-shadow:0 5px 20px rgba(0,0,0,.08);text-align:center;padding:30px}
.expert-avatar{width:120px;height:120px;margin:0 auto 20px;border-radius:50%;overflow:hidden;border:4px solid #ff6b9d}
.expert-avatar img{width:100%;height:100%;object-fit:cover}
.expert-name{font-size:1.3rem;color:#333;margin-bottom:5px}
.expert-title{color:#ff6b9d;font-size:.95rem;margin-bottom:15px}
.expert-credentials{display:flex;flex-wrap:wrap;gap:8px;justify-content:center;margin-bottom:15px}
.credential{background:#f8f9fa;padding:5px 12px;border-radius:15px;font-size:.8rem;color:#666}
.expert-desc{color:#666;font-size:.9rem;line-height:1.7}

/* Stats */
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:30px;text-align:center}
.stat-item{padding:30px}
.stat-number{font-size:2.5rem;font-weight:700;color:#ff6b9d;margin-bottom:10px}
.stat-label{color:#666;font-size:1rem}

/* Review */
.review-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:25px}
.review-card{background:#fff;padding:25px;border-radius:15px;box-shadow:0 5px 20px rgba(0,0,0,.05)}
.review-header{display:flex;align-items:center;gap:15px;margin-bottom:15px}
.review-avatar{width:50px;height:50px;background:linear-gradient(135deg,#ff6b9d,#c44569);border-radius:50%;display:flex;align-items:center;justify-content:center;color:#fff;font-weight:600;font-size:1.2rem}
.review-user h4{font-size:1rem;color:#333}
.review-user span{color:#999;font-size:.85rem}
.review-stars{color:#ffc107;margin-bottom:10px;font-size:1.1rem}
.review-text{color:#666;font-size:.95rem;line-height:1.7}
.review-date{color:#999;font-size:.8rem;margin-top:10px}

/* FAQ */
.faq-list{max-width:800px;margin:0 auto}
.faq-item{background:#fff;margin-bottom:15px;border-radius:10px;overflow:hidden;box-shadow:0 2px 10px rgba(0,0,0,.05)}
.faq-question{padding:20px;cursor:pointer;display:flex;justify-content:space-between;align-items:center;font-weight:600;color:#333}
.faq-question svg{width:24px;height:24px;fill:#ff6b9d;transition:transform .3s}
.faq-item.active .faq-question svg{transform:rotate(180deg)}
.faq-answer{padding:0 20px;max-height:0;overflow:hidden;transition:all .3s}
.faq-item.active .faq-answer{padding:0 20px 20px;max-height:500px}
.faq-answer p{color:#666;line-height:1.7}

/* Contact */
.contact-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:30px}
.contact-card{background:#fff;padding:30px;border-radius:15px;box-shadow:0 5px 20px rgba(0,0,0,.05)}
.contact-card h3{font-size:1.2rem;color:#333;margin-bottom:20px;padding-bottom:15px;border-bottom:2px solid #f0f0f0}
.contact-card p{color:#666;margin-bottom:10px;font-size:.95rem}
.contact-card img{max-width:150px;margin:15px auto;border-radius:10px}

/* Footer */
.footer{background:#2d3436;color:#fff;padding:50px 0 30px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:40px;margin-bottom:40px}
.footer-logo{display:flex;align-items:center;gap:10px;margin-bottom:15px}
.footer-logo img{width:50px;height:50px;border-radius:50%}
.footer-desc{color:#b2bec3;font-size:.95rem;line-height:1.7}
.footer-col h4{font-size:1.1rem;margin-bottom:20px;position:relative;padding-bottom:10px}
.footer-col h4::after{content:'';position:absolute;bottom:0;left:0;width:30px;height:2px;background:#ff6b9d}
.footer-col ul li{margin-bottom:10px}
.footer-col ul li a{color:#b2bec3;transition:color .3s}
.footer-col ul li a:hover{color:#ff6b9d}
.footer-qr{display:flex;gap:15px}
.footer-qr-item{text-align:center}
.footer-qr-item img{width:100px;height:100px;border-radius:8px;margin-bottom:8px}
.footer-qr-item span{color:#b2bec3;font-size:.85rem}
.footer-bottom{text-align:center;padding-top:30px;border-top:1px solid #444}
.footer-bottom p{color:#b2bec3;font-size:.9rem;margin-bottom:8px}
.update-time{color:#ff6b9d;font-size:.85rem}

/* Breadcrumb */
.breadcrumb{background:#f8f9fa;padding:15px 0}
.breadcrumb-list{display:flex;align-items:center;gap:10px;font-size:.9rem}
.breadcrumb-list a{color:#666}
.breadcrumb-list a:hover{color:#ff6b9d}
.breadcrumb-list span{color:#999}

/* Responsive */
@media(max-width:1024px){
    .video-grid,.feature-grid{grid-template-columns:repeat(2,1fr)}
    .expert-grid,.review-grid,.contact-grid{grid-template-columns:repeat(2,1fr)}
    .stats-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:100%;left:0;width:100%;background:linear-gradient(135deg,#ff6b9d,#c44569);flex-direction:column;padding:20px;gap:10px}
    .nav-menu.active{display:flex}
    .mobile-menu-btn{display:flex}
    .hero{height:400px}
    .hero-content h1{font-size:2rem}
    .video-grid,.feature-grid,.expert-grid,.review-grid,.contact-grid{grid-template-columns:1fr}
    .stats-grid{grid-template-columns:repeat(2,1fr)}
    .footer-grid{grid-template-columns:1fr}
    .section{padding:40px 0}
}
@media(max-width:480px){
    .hero-content h1{font-size:1.6rem}
    .hero-content p{font-size:1rem}
    .section-header h2{font-size:1.5rem}
    .btn{padding:12px 25px;font-size:.9rem}
}