/* 草莓视频 - 汽车改装视频社区 原创样式 */
/* 配色：深蓝黑底 #0D1117 + 赛车红 #E63946 + 金属银 #B0B8C4 + 琥珀黄 #F5A623 */
:root{--bg-primary:#0D1117;--bg-secondary:#161B22;--bg-card:#1C2128;--bg-hover:#21262D;--accent:#E63946;--accent-light:#FF4D5A;--gold:#F5A623;--silver:#B0B8C4;--text-primary:#E6EDF3;--text-secondary:#8B949E;--border:#30363D;--radius:10px;--shadow:0 4px 20px rgba(0,0,0,.4)}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;background:var(--bg-primary);color:var(--text-primary);line-height:1.7;min-height:100vh}
a{color:var(--accent);text-decoration:none;transition:color .2s}
a:hover{color:var(--accent-light)}
img{max-width:100%;height:auto;display:block}
.container{max-width:1240px;margin:0 auto;padding:0 20px}

/* 头部导航 */
.site-header{position:fixed;top:0;left:0;right:0;z-index:1000;background:rgba(13,17,23,.94);backdrop-filter:blur(12px);border-bottom:1px solid var(--border);transition:background .3s}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:64px}
.logo-wrap{display:flex;align-items:center;gap:10px;font-weight:700;color:var(--text-primary)}
.logo-wrap img{border-radius:8px}
.logo-text{font-size:1.25rem;background:linear-gradient(135deg,var(--accent),var(--gold));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;letter-spacing:1px}
.main-nav{display:flex;gap:6px}
.main-nav a{padding:8px 14px;border-radius:6px;color:var(--text-secondary);font-size:.9rem;transition:all .25s;white-space:nowrap}
.main-nav a:hover,.main-nav a.active{color:var(--text-primary);background:var(--bg-hover)}
.main-nav a.active{color:var(--accent);border-bottom:2px solid var(--accent)}
.nav-toggle{display:none;flex-direction:column;gap:5px;cursor:pointer;padding:8px}
.nav-toggle span{width:24px;height:2px;background:var(--text-primary);border-radius:2px;transition:all .3s}

/* 搜索栏 */
.search-bar{padding:16px 0 8px}
.search-wrap{display:flex;max-width:560px;margin:0 auto;background:var(--bg-secondary);border:1px solid var(--border);border-radius:30px;overflow:hidden;transition:border-color .3s}
.search-wrap:focus-within{border-color:var(--accent)}
.search-wrap input{flex:1;padding:10px 20px;background:transparent;border:none;color:var(--text-primary);font-size:.95rem;outline:none}
.search-wrap input::placeholder{color:var(--text-secondary)}
.search-btn{padding:10px 20px;background:var(--accent);border:none;color:#fff;cursor:pointer;font-size:1.1rem;transition:background .2s}
.search-btn:hover{background:var(--accent-light)}

/* 面包屑 */
.breadcrumb{padding:12px 0;font-size:.85rem;color:var(--text-secondary)}
.breadcrumb a{color:var(--text-secondary)}
.breadcrumb a:hover{color:var(--accent)}
.breadcrumb span{margin:0 6px}

/* Hero Banner */
.hero{position:relative;margin-top:64px;height:520px;overflow:hidden;display:flex;align-items:center}
.hero-bg{position:absolute;inset:0;background-size:cover;background-position:center;filter:brightness(.45)}
.hero-bg::after{content:'';position:absolute;inset:0;background:linear-gradient(135deg,rgba(13,17,23,.85),rgba(230,57,70,.15))}
.hero-content{position:relative;z-index:2;max-width:680px;padding:0 40px}
.hero h1{font-size:2.8rem;font-weight:800;margin-bottom:16px;line-height:1.2}
.hero h1 .brand-name{color:var(--accent)}
.hero h1 .highlight{color:var(--gold)}
.hero-desc{font-size:1.1rem;color:var(--silver);margin-bottom:24px;line-height:1.8}
.hero-tags{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:28px}
.hero-tags span{padding:5px 14px;background:rgba(230,57,70,.15);border:1px solid rgba(230,57,70,.3);border-radius:20px;font-size:.82rem;color:var(--accent-light)}
.hero-btns{display:flex;gap:14px;flex-wrap:wrap}
.btn-primary{padding:12px 32px;background:linear-gradient(135deg,var(--accent),#c0392b);color:#fff;border:none;border-radius:8px;font-size:1rem;font-weight:600;cursor:pointer;transition:all .3s;display:inline-flex;align-items:center;gap:8px}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 6px 24px rgba(230,57,70,.4);color:#fff}
.btn-outline{padding:12px 32px;background:transparent;color:var(--text-primary);border:1px solid var(--border);border-radius:8px;font-size:1rem;cursor:pointer;transition:all .3s;display:inline-flex;align-items:center;gap:8px}
.btn-outline:hover{border-color:var(--accent);color:var(--accent);transform:translateY(-2px)}

/* 区块标题 */
.section{padding:60px 0}
.section-header{text-align:center;margin-bottom:40px}
.section-header h2{font-size:2rem;font-weight:700;margin-bottom:10px}
.section-header h2 .accent{color:var(--accent)}
.section-header p{color:var(--text-secondary);font-size:1rem;max-width:600px;margin:0 auto}

/* 视频卡片网格 */
.video-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.video-card{background:var(--bg-card);border-radius:var(--radius);overflow:hidden;border:1px solid var(--border);transition:all .35s;cursor:pointer;position:relative}
.video-card:hover{transform:translateY(-6px);box-shadow:var(--shadow);border-color:var(--accent)}
.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;top:50%;left:50%;transform:translate(-50%,-50%) scale(0);width:56px;height:56px;background:rgba(230,57,70,.9);border-radius:50%;display:flex;align-items:center;justify-content:center;transition:all .35s;z-index:3}
.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:4px}
.video-card:hover .play-btn{transform:translate(-50%,-50%) scale(1)}
.video-duration{position:absolute;bottom:8px;right:8px;background:rgba(0,0,0,.8);color:#fff;padding:2px 8px;border-radius:4px;font-size:.75rem;z-index:2}
.video-tag{position:absolute;top:8px;left:8px;padding:3px 10px;border-radius:4px;font-size:.72rem;font-weight:600;z-index:2}
.tag-racing{background:var(--accent);color:#fff}
.tag-offroad{background:#2D6A4F;color:#fff}
.tag-sedan{background:#1D3557;color:#fff}
.tag-moto{background:var(--gold);color:#000}
.tag-mod{background:#7B2D8B;color:#fff}
.tag-review{background:#0077B6;color:#fff}
.video-info{padding:14px}
.video-info h3{font-size:.92rem;font-weight:600;margin-bottom:8px;line-height:1.4;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.video-meta{display:flex;gap:14px;font-size:.78rem;color:var(--text-secondary)}
.video-meta span{display:flex;align-items:center;gap:4px}

/* 功能特性 */
.features-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.feature-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:32px 24px;text-align:center;transition:all .35s}
.feature-card:hover{border-color:var(--accent);transform:translateY(-4px);box-shadow:var(--shadow)}
.feature-icon{width:64px;height:64px;margin:0 auto 18px;background:linear-gradient(135deg,rgba(230,57,70,.15),rgba(245,166,35,.1));border-radius:16px;display:flex;align-items:center;justify-content:center;font-size:1.8rem}
.feature-card h4{font-size:1.1rem;margin-bottom:10px;color:var(--text-primary)}
.feature-card p{font-size:.88rem;color:var(--text-secondary);line-height:1.7}

/* 专家卡片 */
.expert-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.expert-card{display:flex;gap:20px;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:24px;transition:all .35s}
.expert-card:hover{border-color:var(--accent);box-shadow:var(--shadow)}
.expert-avatar{width:100px;height:100px;border-radius:50%;object-fit:cover;border:3px solid var(--accent);flex-shrink:0}
.expert-info h4{font-size:1.05rem;margin-bottom:4px}
.expert-info .title{color:var(--accent);font-size:.85rem;margin-bottom:8px}
.expert-info p{font-size:.85rem;color:var(--text-secondary);line-height:1.6;margin-bottom:12px}
.expert-btns{display:flex;gap:10px}
.expert-btns a{padding:6px 16px;border-radius:6px;font-size:.8rem;border:1px solid var(--border);color:var(--text-secondary);transition:all .2s}
.expert-btns a:hover{border-color:var(--accent);color:var(--accent)}

/* 社区模块 */
.community-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.community-card{position:relative;border-radius:var(--radius);overflow:hidden;height:280px;cursor:pointer}
.community-card img{width:100%;height:100%;object-fit:cover;transition:transform .5s}
.community-card:hover img{transform:scale(1.1)}
.community-overlay{position:absolute;inset:0;background:linear-gradient(to top,rgba(13,17,23,.9),transparent);display:flex;flex-direction:column;justify-content:flex-end;padding:24px}
.community-overlay h4{font-size:1.15rem;margin-bottom:6px}
.community-overlay p{font-size:.85rem;color:var(--silver)}

/* FAQ */
.faq-list{max-width:800px;margin:0 auto}
.faq-item{border:1px solid var(--border);border-radius:var(--radius);margin-bottom:12px;overflow:hidden}
.faq-q{padding:18px 24px;background:var(--bg-card);cursor:pointer;display:flex;justify-content:space-between;align-items:center;font-weight:600;font-size:.95rem;transition:background .2s}
.faq-q:hover{background:var(--bg-hover)}
.faq-q::after{content:'+';font-size:1.4rem;color:var(--accent);transition:transform .3s}
.faq-item.open .faq-q::after{transform:rotate(45deg)}
.faq-a{padding:0 24px;max-height:0;overflow:hidden;transition:all .35s;color:var(--text-secondary);font-size:.9rem;line-height:1.8}
.faq-item.open .faq-a{padding:16px 24px;max-height:500px}

/* 用户评论 */
.review-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.review-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:24px;transition:all .3s}
.review-card:hover{border-color:var(--gold);box-shadow:var(--shadow)}
.review-stars{color:var(--gold);font-size:1rem;margin-bottom:10px;letter-spacing:2px}
.review-text{font-size:.88rem;color:var(--text-secondary);line-height:1.7;margin-bottom:14px;font-style:italic}
.review-author{display:flex;align-items:center;gap:10px}
.review-author-avatar{width:36px;height:36px;border-radius:50%;background:var(--bg-hover);display:flex;align-items:center;justify-content:center;font-size:.85rem;color:var(--accent);font-weight:700}
.review-author-info{font-size:.82rem}
.review-author-info .name{color:var(--text-primary);font-weight:600}
.review-author-info .date{color:var(--text-secondary)}

/* 合作品牌 */
.partner-wall{display:flex;flex-wrap:wrap;justify-content:center;gap:24px;padding:20px 0}
.partner-item{width:140px;height:70px;background:var(--bg-card);border:1px solid var(--border);border-radius:8px;display:flex;align-items:center;justify-content:center;font-size:.85rem;color:var(--text-secondary);font-weight:600;transition:all .3s}
.partner-item:hover{border-color:var(--accent);color:var(--accent)}

/* How-To指南 */
.howto-steps{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;max-width:900px;margin:0 auto}
.howto-step{text-align:center;padding:24px 16px}
.step-num{width:48px;height:48px;margin:0 auto 14px;background:linear-gradient(135deg,var(--accent),#c0392b);border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:1.2rem;font-weight:700;color:#fff}
.howto-step h5{font-size:.95rem;margin-bottom:8px}
.howto-step p{font-size:.82rem;color:var(--text-secondary);line-height:1.6}

/* 联系我们 */
.contact-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:30px}
.contact-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:30px}
.contact-card h4{font-size:1.1rem;margin-bottom:16px;color:var(--accent)}
.contact-item{display:flex;align-items:center;gap:12px;padding:10px 0;border-bottom:1px solid var(--border);font-size:.9rem;color:var(--text-secondary)}
.contact-item:last-child{border-bottom:none}
.contact-icon{width:36px;height:36px;background:rgba(230,57,70,.1);border-radius:8px;display:flex;align-items:center;justify-content:center;font-size:1rem;flex-shrink:0}

/* 分享按钮 */
.share-bar{display:flex;justify-content:center;gap:16px;padding:30px 0}
.share-btn{width:44px;height:44px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:.8rem;font-weight:700;color:#fff;transition:all .3s;cursor:pointer}
.share-btn:hover{transform:translateY(-3px);box-shadow:0 4px 16px rgba(0,0,0,.3);color:#fff}
.share-wechat{background:#07C160}
.share-weibo{background:#E6162D}
.share-douyin{background:#000;border:1px solid #333}
.share-bilibili{background:#00A1D6}

/* 页脚 */
.site-footer{background:var(--bg-secondary);border-top:1px solid var(--border);padding:48px 0 0;margin-top:60px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:30px;margin-bottom:36px}
.footer-brand p{font-size:.88rem;color:var(--text-secondary);margin-top:14px;line-height:1.7}
.footer-col h5{font-size:.95rem;margin-bottom:14px;color:var(--text-primary)}
.footer-col a{display:block;padding:4px 0;font-size:.85rem;color:var(--text-secondary);transition:color .2s}
.footer-col a:hover{color:var(--accent)}
.footer-bottom{border-top:1px solid var(--border);padding:20px 0;text-align:center;font-size:.82rem;color:var(--text-secondary)}
.footer-bottom .update-time{margin-top:6px;color:var(--gold)}

/* 内页通用 */
.page-hero{margin-top:64px;padding:50px 0;background:var(--bg-secondary);border-bottom:1px solid var(--border)}
.page-hero h1{font-size:2.2rem;font-weight:700;margin-bottom:10px}
.page-hero p{color:var(--text-secondary);font-size:1rem;max-width:600px}
.page-content{padding:40px 0}

/* 响应式 */
@media(max-width:1024px){
.video-grid{grid-template-columns:repeat(3,1fr)}
.features-grid{grid-template-columns:repeat(2,1fr)}
.review-grid{grid-template-columns:repeat(2,1fr)}
.footer-grid{grid-template-columns:repeat(2,1fr)}
.howto-steps{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:768px){
.main-nav{display:none;position:fixed;top:64px;left:0;right:0;background:var(--bg-secondary);flex-direction:column;padding:16px;border-bottom:1px solid var(--border);gap:4px}
.main-nav.open{display:flex}
.nav-toggle{display:flex}
.hero{height:auto;padding:100px 0 60px}
.hero h1{font-size:1.8rem}
.video-grid{grid-template-columns:repeat(2,1fr)}
.features-grid{grid-template-columns:1fr}
.expert-grid{grid-template-columns:1fr}
.expert-card{flex-direction:column;align-items:center;text-align:center}
.community-grid{grid-template-columns:1fr}
.review-grid{grid-template-columns:1fr}
.contact-grid{grid-template-columns:1fr}
.footer-grid{grid-template-columns:1fr}
.howto-steps{grid-template-columns:1fr}
.hero-btns{flex-direction:column}
}
@media(max-width:480px){
.video-grid{grid-template-columns:1fr}
.container{padding:0 14px}
.hero-content{padding:0 14px}
}