/* ===== 51视频 - 原创样式表 ===== */
/* 配色方案：活力红 #FF4757 | 深空灰 #2F3542 | 暖橙 #FFA502 | 浅灰白 #F8F9FA */

/* ===== 基础重置 ===== */
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;font-size:16px}
body{font-family:"PingFang SC","Microsoft YaHei","Hiragino Sans GB",Arial,sans-serif;color:#2F3542;background:#F8F9FA;line-height:1.7;overflow-x:hidden}
a{color:#FF4757;text-decoration:none;transition:color .3s}
a:hover{color:#FFA502}
img{max-width:100%;height:auto;display:block}
ul,ol{list-style:none}
.container{max-width:1200px;margin:0 auto;padding:0 20px}

/* ===== 头部导航 ===== */
.site-header{background:#2F3542;position:sticky;top:0;z-index:1000;box-shadow:0 2px 12px rgba(0,0,0,.15)}
.header-inner{display:flex;align-items:center;justify-content:space-between;padding:0 20px;max-width:1200px;margin:0 auto;height:68px}
.logo-link{display:flex;align-items:center;gap:10px}
.logo-link img{height:42px;width:auto}
.logo-text{color:#fff;font-size:1.4rem;font-weight:700;letter-spacing:1px}
.main-nav{display:flex;align-items:center;gap:0}
.main-nav a{color:#ddd;padding:0 16px;font-size:.95rem;line-height:68px;transition:all .3s;position:relative}
.main-nav a:hover,.main-nav a.active{color:#FF4757;background:rgba(255,71,87,.08)}
.main-nav a::after{content:'';position:absolute;bottom:0;left:50%;transform:translateX(-50%);width:0;height:3px;background:#FF4757;transition:width .3s}
.main-nav a:hover::after,.main-nav a.active::after{width:60%}
.mobile-menu-btn{display:none;background:none;border:none;color:#fff;font-size:1.5rem;cursor:pointer}

/* ===== 搜索栏 ===== */
.search-bar{background:linear-gradient(135deg,#2F3542 0%,#3d4555 100%);padding:16px 0}
.search-bar .container{display:flex;justify-content:center}
.search-wrap{display:flex;max-width:600px;width:100%;border-radius:25px;overflow:hidden;box-shadow:0 4px 15px rgba(0,0,0,.2)}
.search-wrap input{flex:1;padding:12px 24px;border:none;font-size:1rem;outline:none;background:#fff;color:#2F3542}
.search-wrap input::placeholder{color:#999}
.search-wrap button{padding:12px 28px;background:#FF4757;color:#fff;border:none;font-size:1rem;cursor:pointer;transition:background .3s;font-weight:600}
.search-wrap button:hover{background:#FFA502}

/* ===== Hero Banner ===== */
.hero-section{position:relative;height:520px;overflow:hidden;display:flex;align-items:center;justify-content:center}
.hero-section .hero-bg{position:absolute;inset:0;background-size:cover;background-position:center;filter:brightness(.55)}
.hero-content{position:relative;z-index:2;text-align:center;color:#fff;padding:0 20px}
.hero-content h1{font-size:2.8rem;font-weight:800;margin-bottom:16px;text-shadow:0 3px 12px rgba(0,0,0,.5)}
.hero-content h1 span{color:#FF4757}
.hero-content p{font-size:1.2rem;max-width:680px;margin:0 auto 28px;opacity:.92;text-shadow:0 2px 8px rgba(0,0,0,.4)}
.hero-btn{display:inline-block;padding:14px 36px;background:#FF4757;color:#fff;border-radius:30px;font-size:1.05rem;font-weight:600;transition:all .3s;box-shadow:0 4px 15px rgba(255,71,87,.4)}
.hero-btn:hover{background:#FFA502;color:#fff;transform:translateY(-2px);box-shadow:0 6px 20px rgba(255,165,2,.4)}

/* ===== 通用区块标题 ===== */
.section-title{text-align:center;margin-bottom:40px}
.section-title h2{font-size:2rem;font-weight:700;color:#2F3542;margin-bottom:8px;position:relative;display:inline-block}
.section-title h2::after{content:'';display:block;width:60px;height:4px;background:linear-gradient(90deg,#FF4757,#FFA502);margin:10px auto 0;border-radius:2px}
.section-title p{color:#666;font-size:1rem;margin-top:8px}

/* ===== 动漫视频卡片 ===== */
.video-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;padding:60px 0}
.video-card{background:#fff;border-radius:12px;overflow:hidden;box-shadow:0 4px 16px rgba(0,0,0,.08);transition:all .35s;cursor:pointer}
.video-card:hover{transform:translateY(-6px);box-shadow:0 12px 32px rgba(255,71,87,.15)}
.video-thumb{position:relative;padding-top:56.25%;overflow:hidden}
.video-thumb img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;transition:transform .4s}
.video-card:hover .video-thumb img{transform:scale(1.08)}
.play-btn{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;background:rgba(0,0,0,.35);opacity:0;transition:opacity .35s}
.video-card:hover .play-btn{opacity:1}
.play-btn span{width:56px;height:56px;background:#FF4757;border-radius:50%;display:flex;align-items:center;justify-content:center;box-shadow:0 4px 15px rgba(255,71,87,.5)}
.play-btn span::after{content:'';border-style:solid;border-width:10px 0 10px 18px;border-color:transparent transparent transparent #fff;margin-left:4px}
.video-info{padding:14px 16px}
.video-info h3{font-size:.95rem;font-weight:600;color:#2F3542;margin-bottom:6px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.video-meta{display:flex;gap:12px;font-size:.8rem;color:#999}
.video-meta span{display:flex;align-items:center;gap:3px}
.video-tag{display:inline-block;padding:2px 8px;background:#FFF0F0;color:#FF4757;border-radius:4px;font-size:.75rem;margin-top:6px}

/* ===== 影视传媒服务 ===== */
.services-section{background:#fff;padding:60px 0}
.services-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:28px}
.service-card{padding:32px 24px;border-radius:12px;background:linear-gradient(145deg,#F8F9FA,#fff);border:1px solid #eee;text-align:center;transition:all .35s}
.service-card:hover{border-color:#FF4757;box-shadow:0 8px 24px rgba(255,71,87,.1);transform:translateY(-4px)}
.service-icon{width:64px;height:64px;margin:0 auto 16px;background:linear-gradient(135deg,#FF4757,#FF6B81);border-radius:16px;display:flex;align-items:center;justify-content:center;font-size:1.8rem;color:#fff}
.service-card h3{font-size:1.15rem;font-weight:600;margin-bottom:10px;color:#2F3542}
.service-card p{font-size:.9rem;color:#666;line-height:1.6}

/* ===== AI赋能专区 ===== */
.ai-section{padding:60px 0;background:linear-gradient(135deg,#2F3542 0%,#1a1f2b 100%);color:#fff}
.ai-section .section-title h2{color:#fff}
.ai-section .section-title p{color:#aaa}
.ai-grid{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:center}
.ai-text h3{font-size:1.5rem;margin-bottom:16px;color:#FFA502}
.ai-text p{font-size:.95rem;line-height:1.8;color:#ccc;margin-bottom:16px}
.ai-features{display:flex;flex-wrap:wrap;gap:10px;margin-top:16px}
.ai-tag{padding:6px 16px;background:rgba(255,71,87,.15);color:#FF6B81;border-radius:20px;font-size:.85rem;border:1px solid rgba(255,71,87,.3)}
.ai-image{border-radius:12px;overflow:hidden;box-shadow:0 8px 30px rgba(0,0,0,.3)}
.ai-image img{width:100%;display:block}

/* ===== 社区互动 ===== */
.community-section{padding:60px 0;background:#fff}
.community-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.community-card{background:linear-gradient(145deg,#FFF5F5,#fff);border:1px solid #ffe0e0;border-radius:12px;padding:24px 20px;text-align:center;transition:all .3s}
.community-card:hover{border-color:#FF4757;transform:translateY(-4px);box-shadow:0 8px 20px rgba(255,71,87,.1)}
.community-icon{font-size:2.2rem;margin-bottom:12px}
.community-card h4{font-size:1rem;font-weight:600;color:#2F3542;margin-bottom:8px}
.community-card p{font-size:.85rem;color:#666}

/* ===== 专家展示 ===== */
.experts-section{padding:60px 0;background:#F8F9FA}
.experts-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.expert-card{background:#fff;border-radius:12px;overflow:hidden;box-shadow:0 4px 16px rgba(0,0,0,.06);text-align:center;transition:all .35s}
.expert-card:hover{transform:translateY(-6px);box-shadow:0 12px 28px rgba(0,0,0,.1)}
.expert-avatar{width:100%;aspect-ratio:1;overflow:hidden}
.expert-avatar img{width:100%;height:100%;object-fit:cover;transition:transform .4s}
.expert-card:hover .expert-avatar img{transform:scale(1.05)}
.expert-info{padding:20px 16px}
.expert-info h4{font-size:1.05rem;font-weight:600;color:#2F3542;margin-bottom:4px}
.expert-info .role{color:#FF4757;font-size:.85rem;margin-bottom:8px}
.expert-info p{font-size:.82rem;color:#888;line-height:1.5;margin-bottom:12px}
.expert-btns{display:flex;gap:8px;justify-content:center}
.expert-btns a{padding:6px 14px;border-radius:20px;font-size:.8rem;font-weight:500;transition:all .3s}
.btn-contact{background:#FF4757;color:#fff}
.btn-contact:hover{background:#e63e4d;color:#fff}
.btn-works{background:#fff;color:#FF4757;border:1px solid #FF4757}
.btn-works:hover{background:#FF4757;color:#fff}

/* ===== 合作品牌 ===== */
.partners-section{padding:50px 0;background:#fff}
.partners-wall{display:flex;justify-content:center;flex-wrap:wrap;gap:40px;align-items:center;padding:20px 0}
.partner-logo{height:48px;opacity:.5;filter:grayscale(100%);transition:all .3s}
.partner-logo:hover{opacity:1;filter:grayscale(0)}

/* ===== 用户评价 ===== */
.reviews-section{padding:60px 0;background:#F8F9FA}
.reviews-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.review-card{background:#fff;border-radius:12px;padding:28px;box-shadow:0 4px 16px rgba(0,0,0,.05);transition:all .3s}
.review-card:hover{box-shadow:0 8px 24px rgba(0,0,0,.1)}
.review-header{display:flex;align-items:center;gap:12px;margin-bottom:14px}
.review-avatar{width:48px;height:48px;border-radius:50%;background:#FF4757;color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:1.1rem}
.review-name{font-weight:600;color:#2F3542;font-size:.95rem}
.review-date{font-size:.8rem;color:#999}
.review-stars{color:#FFA502;font-size:.9rem;margin-bottom:8px}
.review-text{font-size:.9rem;color:#555;line-height:1.7}

/* ===== FAQ ===== */
.faq-section{padding:60px 0;background:#fff}
.faq-list{max-width:800px;margin:0 auto}
.faq-item{border:1px solid #eee;border-radius:10px;margin-bottom:12px;overflow:hidden;transition:all .3s}
.faq-item:hover{border-color:#FF4757}
.faq-question{padding:18px 24px;font-weight:600;font-size:.95rem;color:#2F3542;cursor:pointer;display:flex;justify-content:space-between;align-items:center;background:#fff;transition:background .3s}
.faq-question:hover{background:#FFF5F5}
.faq-question .arrow{font-size:1.2rem;color:#FF4757;transition:transform .3s}
.faq-item.open .faq-question .arrow{transform:rotate(180deg)}
.faq-answer{padding:0 24px;max-height:0;overflow:hidden;transition:all .4s;font-size:.9rem;color:#666;line-height:1.7}
.faq-item.open .faq-answer{padding:0 24px 18px;max-height:500px}

/* ===== 联系我们 ===== */
.contact-section{padding:60px 0;background:linear-gradient(135deg,#2F3542,#1a1f2b);color:#fff}
.contact-section .section-title h2{color:#fff}
.contact-section .section-title p{color:#aaa}
.contact-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:30px}
.contact-card{background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.1);border-radius:12px;padding:28px;text-align:center;transition:all .3s}
.contact-card:hover{background:rgba(255,71,87,.08);border-color:rgba(255,71,87,.3)}
.contact-card h4{font-size:1.05rem;margin-bottom:12px;color:#FFA502}
.contact-card p{font-size:.9rem;color:#ccc;line-height:1.6}
.contact-qr{display:flex;justify-content:center;gap:60px;margin-top:40px}
.qr-item{text-align:center}
.qr-item img{width:140px;height:140px;border-radius:8px;margin-bottom:10px;border:2px solid rgba(255,255,255,.15)}
.qr-item p{font-size:.85rem;color:#aaa}

/* ===== 社交分享 ===== */
.share-bar{display:flex;justify-content:center;gap:16px;padding:20px 0}
.share-btn{display:inline-flex;align-items:center;gap:6px;padding:8px 18px;border-radius:20px;font-size:.85rem;color:#fff;transition:all .3s;cursor:pointer}
.share-btn:hover{transform:translateY(-2px);color:#fff}
.share-wechat{background:#07C160}
.share-weibo{background:#E6162D}
.share-douyin{background:#161823}
.share-bilibili{background:#FB7299}

/* ===== 页脚 ===== */
.site-footer{background:#1a1f2b;color:#aaa;padding:40px 0 20px}
.footer-top{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:30px;padding-bottom:30px;border-bottom:1px solid rgba(255,255,255,.08)}
.footer-brand h3{color:#fff;font-size:1.3rem;margin-bottom:10px}
.footer-brand p{font-size:.85rem;line-height:1.7;color:#888}
.footer-links h4{color:#ddd;font-size:.95rem;margin-bottom:14px}
.footer-links a{display:block;color:#888;font-size:.85rem;padding:4px 0;transition:color .3s}
.footer-links a:hover{color:#FF4757}
.footer-bottom{display:flex;justify-content:space-between;align-items:center;padding-top:20px;font-size:.8rem;color:#666}
.footer-bottom .update-time{color:#888}

/* ===== 面包屑 ===== */
.breadcrumb{padding:14px 0;font-size:.85rem;color:#999}
.breadcrumb a{color:#FF4757}
.breadcrumb span{margin:0 6px;color:#ccc}

/* ===== 内页通用 ===== */
.page-hero{position:relative;height:320px;display:flex;align-items:center;justify-content:center;overflow:hidden}
.page-hero .hero-bg{position:absolute;inset:0;background-size:cover;background-position:center;filter:brightness(.45)}
.page-hero .hero-content{position:relative;z-index:2;text-align:center;color:#fff}
.page-hero h1{font-size:2.2rem;font-weight:700;margin-bottom:8px}
.page-hero p{font-size:1rem;opacity:.85}
.page-content{padding:50px 0}
.content-section{margin-bottom:50px}

/* ===== How-To指南 ===== */
.howto-steps{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;margin-top:30px}
.step-card{text-align:center;padding:24px 16px;background:#fff;border-radius:12px;border:1px solid #eee;transition:all .3s}
.step-card:hover{border-color:#FF4757;box-shadow:0 6px 20px rgba(255,71,87,.1)}
.step-num{width:48px;height:48px;border-radius:50%;background:#FF4757;color:#fff;display:flex;align-items:center;justify-content:center;font-size:1.3rem;font-weight:700;margin:0 auto 14px}
.step-card h4{font-size:.95rem;font-weight:600;margin-bottom:8px;color:#2F3542}
.step-card p{font-size:.82rem;color:#666}

/* ===== 响应式 ===== */
@media(max-width:1024px){
.video-grid{grid-template-columns:repeat(3,1fr)}
.services-grid{grid-template-columns:repeat(2,1fr)}
.experts-grid{grid-template-columns:repeat(2,1fr)}
.community-grid{grid-template-columns:repeat(2,1fr)}
.contact-grid{grid-template-columns:1fr}
.footer-top{grid-template-columns:1fr 1fr}
.ai-grid{grid-template-columns:1fr}
.howto-steps{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:768px){
.header-inner{padding:0 16px}
.main-nav{display:none;position:absolute;top:68px;left:0;right:0;background:#2F3542;flex-direction:column;box-shadow:0 8px 20px rgba(0,0,0,.2)}
.main-nav.open{display:flex}
.main-nav a{line-height:48px;padding:0 20px;border-bottom:1px solid rgba(255,255,255,.05)}
.mobile-menu-btn{display:block}
.hero-section{height:380px}
.hero-content h1{font-size:1.8rem}
.hero-content p{font-size:1rem}
.video-grid{grid-template-columns:repeat(2,1fr);gap:16px}
.reviews-grid{grid-template-columns:1fr}
.footer-top{grid-template-columns:1fr}
.footer-bottom{flex-direction:column;gap:8px;text-align:center}
.contact-qr{flex-direction:column;align-items:center;gap:30px}
.howto-steps{grid-template-columns:1fr}
.experts-grid{grid-template-columns:1fr}
.services-grid{grid-template-columns:1fr}
}
@media(max-width:480px){
.video-grid{grid-template-columns:1fr}
.hero-section{height:300px}
.hero-content h1{font-size:1.5rem}
.search-wrap{border-radius:8px}
}