/* 91修车改装视频社区 - 原创样式表 */
/* 配色：深碳灰#1a1a2e 橙红#e94560 钢蓝#0f3460 亮银#c4c4c4 暖白#f5f5f0 */
:root{--carbon:#1a1a2e;--flame:#e94560;--steel:#0f3460;--silver:#c4c4c4;--warm:#f5f5f0;--dark:#0d0d1a;--accent:#ff6b35;--text:#2d2d3a;--light-bg:#f0f2f5;--card-bg:#ffffff;--shadow:0 4px 20px rgba(0,0,0,.08)}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;font-size:16px}
body{font-family:"PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;color:var(--text);background:var(--warm);line-height:1.7}
a{color:var(--steel);text-decoration:none;transition:color .3s}
a:hover{color:var(--flame)}
img{max-width:100%;height:auto;display:block}
.container{max-width:1200px;margin:0 auto;padding:0 20px}

/* 顶部导航 */
.top-bar{background:var(--dark);color:#fff;font-size:13px;padding:6px 0;text-align:center}
.top-bar a{color:var(--silver);margin:0 12px}
.top-bar a:hover{color:var(--flame)}
.site-header{background:var(--carbon);position:sticky;top:0;z-index:1000;box-shadow:0 2px 15px rgba(0,0,0,.3)}
.header-inner{display:flex;align-items:center;justify-content:space-between;padding:12px 20px;max-width:1200px;margin:0 auto}
.logo-area{display:flex;align-items:center;gap:10px}
.logo-area img{height:42px;width:auto}
.logo-area h1{color:#fff;font-size:22px;font-weight:700;letter-spacing:1px}
.logo-area h1 span{color:var(--flame)}
.main-nav{display:flex;gap:0}
.main-nav a{color:#ddd;padding:10px 16px;font-size:14px;font-weight:500;position:relative;transition:all .3s}
.main-nav a:hover,.main-nav a.active{color:var(--flame)}
.main-nav a::after{content:'';position:absolute;bottom:0;left:50%;width:0;height:2px;background:var(--flame);transition:all .3s;transform:translateX(-50%)}
.main-nav a:hover::after,.main-nav a.active::after{width:70%}
.mobile-toggle{display:none;color:#fff;font-size:26px;cursor:pointer;background:none;border:none}

/* 搜索框 */
.search-bar{background:var(--steel);padding:10px 0}
.search-inner{max-width:600px;margin:0 auto;display:flex;gap:0}
.search-inner input{flex:1;padding:10px 18px;border:none;border-radius:25px 0 0 25px;font-size:14px;outline:none}
.search-inner button{padding:10px 28px;background:var(--flame);color:#fff;border:none;border-radius:0 25px 25px 0;cursor:pointer;font-size:14px;font-weight:600;transition:background .3s}
.search-inner button:hover{background:#d63050}

/* Banner */
.hero-banner{position:relative;height:520px;overflow:hidden;display:flex;align-items:center;justify-content:center}
.hero-banner img{position:absolute;top:0;left:0;width:100%;height:100%;object-fit:cover}
.hero-overlay{position:absolute;top:0;left:0;width:100%;height:100%;background:linear-gradient(135deg,rgba(26,26,46,.85) 0%,rgba(15,52,96,.7) 50%,rgba(233,69,96,.4) 100%)}
.hero-content{position:relative;z-index:2;text-align:center;color:#fff;max-width:800px;padding:0 20px}
.hero-content h2{font-size:42px;font-weight:800;margin-bottom:16px;text-shadow:2px 2px 8px rgba(0,0,0,.5)}
.hero-content h2 span{color:var(--flame)}
.hero-content p{font-size:18px;margin-bottom:28px;opacity:.9;line-height:1.8}
.hero-btns{display:flex;gap:16px;justify-content:center;flex-wrap:wrap}
.btn-primary{background:var(--flame);color:#fff;padding:14px 36px;border-radius:30px;font-size:15px;font-weight:600;transition:all .3s;border:none;cursor:pointer;display:inline-block}
.btn-primary:hover{background:#d63050;transform:translateY(-2px);box-shadow:0 6px 20px rgba(233,69,96,.4);color:#fff}
.btn-outline{border:2px solid #fff;color:#fff;padding:12px 34px;border-radius:30px;font-size:15px;font-weight:600;transition:all .3s;display:inline-block}
.btn-outline:hover{background:#fff;color:var(--carbon)}

/* 通用板块 */
.section{padding:60px 0}
.section-dark{background:var(--carbon);color:#fff}
.section-alt{background:var(--light-bg)}
.section-title{text-align:center;margin-bottom:45px}
.section-title h2{font-size:32px;font-weight:700;color:var(--carbon);margin-bottom:10px}
.section-dark .section-title h2{color:#fff}
.section-title h3{font-size:16px;color:var(--flame);font-weight:500;margin-bottom:8px;letter-spacing:2px}
.section-title p{color:#777;font-size:15px;max-width:650px;margin:0 auto}
.section-dark .section-title p{color:var(--silver)}

/* 视频卡片网格 */
.video-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.video-card{background:var(--card-bg);border-radius:12px;overflow:hidden;box-shadow:var(--shadow);transition:all .4s;position:relative}
.video-card:hover{transform:translateY(-6px);box-shadow:0 12px 35px rgba(0,0,0,.15)}
.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(1.08)}
.play-btn{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%) scale(0);width:60px;height:60px;background:rgba(233,69,96,.9);border-radius:50%;display:flex;align-items:center;justify-content:center;transition:all .4s;cursor:pointer;z-index:3}
.play-btn::after{content:'';width:0;height:0;border-style:solid;border-width:10px 0 10px 18px;border-color:transparent transparent transparent #fff;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:12px;z-index:3}
.video-info{padding:16px}
.video-info h4{font-size:15px;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:12px;color:#999}
.video-meta span{display:flex;align-items:center;gap:4px}
.video-tags{display:flex;gap:6px;flex-wrap:wrap;margin-top:10px}
.video-tags span{background:rgba(233,69,96,.08);color:var(--flame);padding:3px 10px;border-radius:12px;font-size:11px}

/* 三列模块 */
.tri-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:28px}
.tri-card{background:var(--card-bg);border-radius:12px;padding:32px 24px;text-align:center;box-shadow:var(--shadow);transition:all .4s;border-top:3px solid transparent}
.tri-card:hover{transform:translateY(-5px);border-top-color:var(--flame)}
.tri-card .icon{width:64px;height:64px;background:linear-gradient(135deg,var(--flame),var(--accent));border-radius:16px;display:flex;align-items:center;justify-content:center;margin:0 auto 20px;font-size:28px;color:#fff}
.tri-card h4{font-size:18px;font-weight:600;margin-bottom:10px}
.tri-card p{font-size:14px;color:#666;line-height:1.7}

/* 专家卡片 */
.expert-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.expert-card{background:var(--card-bg);border-radius:12px;overflow:hidden;box-shadow:var(--shadow);text-align:center;transition:all .4s}
.expert-card:hover{transform:translateY(-5px)}
.expert-card img{width:100%;height:240px;object-fit:cover}
.expert-card .info{padding:20px}
.expert-card h4{font-size:16px;font-weight:600;margin-bottom:4px}
.expert-card .role{color:var(--flame);font-size:13px;margin-bottom:8px}
.expert-card p{font-size:13px;color:#777;line-height:1.6}
.expert-card .actions{display:flex;gap:8px;justify-content:center;margin-top:12px}
.expert-card .actions a{padding:6px 16px;border-radius:20px;font-size:12px;border:1px solid var(--flame);color:var(--flame);transition:all .3s}
.expert-card .actions a:hover{background:var(--flame);color:#fff}

/* FAQ */
.faq-list{max-width:800px;margin:0 auto}
.faq-item{background:var(--card-bg);border-radius:10px;margin-bottom:12px;box-shadow:var(--shadow);overflow:hidden}
.faq-q{padding:18px 24px;font-weight:600;cursor:pointer;display:flex;justify-content:space-between;align-items:center;font-size:15px;transition:background .3s}
.faq-q:hover{background:rgba(233,69,96,.04)}
.faq-q::after{content:'+';font-size:22px;color:var(--flame);transition:transform .3s;font-weight:400}
.faq-item.open .faq-q::after{transform:rotate(45deg)}
.faq-a{padding:0 24px;max-height:0;overflow:hidden;transition:all .4s;font-size:14px;color:#666;line-height:1.8}
.faq-item.open .faq-a{padding:0 24px 18px;max-height:500px}

/* 评论 */
.review-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.review-card{background:var(--card-bg);border-radius:12px;padding:28px;box-shadow:var(--shadow);position:relative}
.review-card::before{content:'\201C';position:absolute;top:12px;left:20px;font-size:60px;color:rgba(233,69,96,.15);font-family:Georgia,serif;line-height:1}
.review-card .stars{color:#ffc107;font-size:16px;margin-bottom:10px;letter-spacing:2px}
.review-card p{font-size:14px;color:#555;line-height:1.8;margin-bottom:14px;padding-top:10px}
.review-card .reviewer{display:flex;align-items:center;gap:10px}
.review-card .reviewer strong{font-size:14px}
.review-card .reviewer span{font-size:12px;color:#999}

/* 联系我们 */
.contact-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:28px}
.contact-card{background:var(--card-bg);border-radius:12px;padding:28px;text-align:center;box-shadow:var(--shadow)}
.contact-card h4{font-size:17px;font-weight:600;margin-bottom:14px;color:var(--carbon)}
.contact-card p{font-size:14px;color:#666;line-height:1.8}
.contact-card .qr-placeholder{width:120px;height:120px;background:var(--light-bg);border-radius:8px;margin:12px auto;display:flex;align-items:center;justify-content:center;font-size:12px;color:#999}

/* 合作品牌 */
.brand-wall{display:flex;flex-wrap:wrap;justify-content:center;gap:30px;align-items:center}
.brand-wall .brand-item{background:var(--card-bg);padding:16px 28px;border-radius:8px;font-size:16px;font-weight:600;color:var(--steel);box-shadow:var(--shadow);transition:all .3s}
.brand-wall .brand-item:hover{transform:scale(1.05);color:var(--flame)}

/* 面包屑 */
.breadcrumb{padding:14px 0;font-size:13px;color:#999}
.breadcrumb a{color:var(--steel)}
.breadcrumb a:hover{color:var(--flame)}
.breadcrumb span{margin:0 6px;color:#ccc}

/* 页脚 */
.site-footer{background:var(--dark);color:var(--silver);padding:50px 0 0}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:36px;max-width:1200px;margin:0 auto;padding:0 20px}
.footer-col h4{color:#fff;font-size:16px;margin-bottom:16px;font-weight:600}
.footer-col p{font-size:13px;line-height:1.9;color:#aaa}
.footer-col a{display:block;color:#aaa;font-size:13px;padding:3px 0;transition:color .3s}
.footer-col a:hover{color:var(--flame)}
.footer-col .footer-logo{height:36px;margin-bottom:12px}
.footer-bottom{border-top:1px solid rgba(255,255,255,.08);margin-top:40px;padding:18px 20px;text-align:center;font-size:12px;color:#777}
.footer-social{display:flex;gap:12px;margin-top:12px}
.footer-social a{width:36px;height:36px;background:rgba(255,255,255,.08);border-radius:50%;display:flex;align-items:center;justify-content:center;color:#aaa;font-size:14px;transition:all .3s}
.footer-social a:hover{background:var(--flame);color:#fff}

/* 社区频道 */
.channel-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.channel-card{background:var(--card-bg);border-radius:12px;overflow:hidden;box-shadow:var(--shadow);transition:all .4s}
.channel-card:hover{transform:translateY(-5px)}
.channel-card img{width:100%;height:200px;object-fit:cover}
.channel-card .ch-info{padding:20px}
.channel-card h4{font-size:16px;font-weight:600;margin-bottom:6px}
.channel-card .ch-stats{font-size:12px;color:#999;margin-bottom:8px}
.channel-card p{font-size:13px;color:#666;line-height:1.6}

/* 内页头部 */
.page-hero{background:linear-gradient(135deg,var(--carbon),var(--steel));padding:60px 0;text-align:center;color:#fff}
.page-hero h2{font-size:34px;font-weight:700;margin-bottom:10px}
.page-hero p{font-size:16px;opacity:.85;max-width:600px;margin:0 auto}

/* 干扰标签隐藏 */
.noise-wrap{position:absolute;width:0;height:0;overflow:hidden;opacity:0;pointer-events:none;z-index:-9999}

/* 响应式 */
@media(max-width:1024px){
.video-grid{grid-template-columns:repeat(2,1fr)}
.tri-grid{grid-template-columns:repeat(2,1fr)}
.expert-grid{grid-template-columns:repeat(2,1fr)}
.footer-grid{grid-template-columns:repeat(2,1fr)}
.contact-grid{grid-template-columns:1fr}
}
@media(max-width:768px){
.header-inner{flex-wrap:wrap}
.main-nav{display:none;flex-direction:column;width:100%;background:var(--carbon);position:absolute;top:100%;left:0;padding:10px 0}
.main-nav.show{display:flex}
.main-nav a{padding:12px 20px;border-bottom:1px solid rgba(255,255,255,.05)}
.mobile-toggle{display:block}
.hero-banner{height:400px}
.hero-content h2{font-size:28px}
.hero-content p{font-size:15px}
.video-grid{grid-template-columns:1fr}
.tri-grid{grid-template-columns:1fr}
.expert-grid{grid-template-columns:1fr}
.review-grid{grid-template-columns:1fr}
.channel-grid{grid-template-columns:1fr}
.footer-grid{grid-template-columns:1fr}
.section{padding:40px 0}
.section-title h2{font-size:24px}
}