/* 免费看片 原创主题：赛道红 — 深钛灰底色搭配赛车红与银白，营造修车改装与汽车社区的专业氛围 */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{--bg:#0d1117;--surface:#161b22;--border:#21262d;--txt:#c9d1d9;--txt-dim:#8b949e;--heading:#e6edf3;--accent:#c41e3a;--accent-lt:#ff4d6a;--accent-bg:rgba(196,30,58,.08);--silver:#a0aec0;--radius:10px;--gap:1.5rem}
html{font-size:16px;scroll-behavior:smooth}
body{font-family:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;background:var(--bg);color:var(--txt);line-height:1.7}
a{color:var(--accent-lt);text-decoration:none;transition:color .2s}
a:hover{color:#fff}
img{max-width:100%;height:auto;display:block}
.wrap{max-width:1280px;margin:0 auto;padding:0 var(--gap)}

/* Header */
.hd{position:sticky;top:0;z-index:100;background:rgba(13,17,23,.92);backdrop-filter:blur(12px);border-bottom:1px solid var(--border);padding:.6rem 0}
.hd-row{display:flex;align-items:center;justify-content:space-between;max-width:1280px;margin:0 auto;padding:0 var(--gap)}
.hd-brand{display:flex;align-items:center;gap:.6rem;color:var(--heading);font-weight:700;text-decoration:none}
.hd-brand div{display:flex;flex-direction:column;line-height:1.2}
.hd-brand span{font-size:.7rem;color:var(--txt-dim);font-weight:400;letter-spacing:.06em}
.logo-icon{width:42px;height:42px;border-radius:10px}
.logo-text{height:42px;width:auto}
.hd-nav{display:flex;gap:.2rem;flex-wrap:wrap}
.hd-nav a{padding:.45rem .85rem;border-radius:var(--radius);font-size:.88rem;color:var(--txt);transition:background .2s,color .2s}
.hd-nav a:hover,.hd-nav a.cur{background:var(--accent-bg);color:var(--accent-lt)}
.hd-toggle{display:none;background:var(--accent);color:#fff;border:none;padding:.5rem 1rem;border-radius:var(--radius);cursor:pointer;font-size:.9rem}

/* Search */
.srch{max-width:1280px;margin:0 auto;padding:.8rem var(--gap) .4rem}
.srch strong{font-size:.85rem;color:var(--heading);display:block;margin-bottom:.4rem}
.srch-box{display:flex;gap:.5rem}
.srch-box input{flex:1;padding:.55rem 1rem;border-radius:var(--radius);border:1px solid var(--border);background:var(--surface);color:var(--heading);font-size:.9rem}
.srch-box button{padding:.55rem 1.3rem;border-radius:var(--radius);border:none;background:var(--accent);color:#fff;cursor:pointer;font-size:.9rem;transition:background .2s}
.srch-box button:hover{background:var(--accent-lt)}
.srch-note{font-size:.72rem;color:var(--txt-dim);margin-top:.3rem}

/* Breadcrumbs */
.crumbs{font-size:.82rem;color:var(--txt-dim);padding:.8rem 0 .3rem;max-width:1280px;margin:0 auto;padding-left:var(--gap);padding-right:var(--gap)}
.crumbs a{color:var(--accent-lt)}

/* Hero Banner */
.hero{position:relative;overflow:hidden;border-radius:var(--radius);margin:var(--gap) auto;max-width:1280px}
.hero-img{width:100%;display:block;border-radius:var(--radius);filter:brightness(.55)}
.hero-overlay{position:absolute;inset:0;display:flex;flex-direction:column;justify-content:center;padding:3rem 4rem;color:#fff}
.hero-overlay .brow{font-size:.85rem;letter-spacing:.12em;text-transform:uppercase;color:var(--accent-lt);margin-bottom:.6rem}
.hero-overlay h1{font-size:2.4rem;font-weight:800;line-height:1.25;margin-bottom:1rem;max-width:680px}
.hero-overlay p{font-size:1.05rem;line-height:1.7;max-width:600px;opacity:.92}
.hero-kpi{display:flex;gap:2rem;margin-top:1.5rem}
.hero-kpi .kpi-box{text-align:center}
.hero-kpi .kpi-box strong{display:block;font-size:1.6rem;color:#fff}
.hero-kpi .kpi-box span{font-size:.78rem;color:rgba(255,255,255,.7)}

/* Sections */
.sec{padding:3rem 0}
.sec-hd{text-align:center;margin-bottom:2rem}
.sec-hd .brow{font-size:.8rem;letter-spacing:.14em;text-transform:uppercase;color:var(--accent);margin-bottom:.4rem}
.sec-hd h2{font-size:1.7rem;font-weight:700;color:var(--heading);margin-bottom:.5rem}
.sec-hd p{color:var(--txt-dim);max-width:680px;margin:0 auto;font-size:.95rem}

/* Video Grid */
.vid-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:var(--gap)}
.vid-card{background:var(--surface);border-radius:var(--radius);overflow:hidden;border:1px solid var(--border);transition:transform .25s,box-shadow .25s}
.vid-card:hover{transform:translateY(-4px);box-shadow:0 8px 24px rgba(196,30,58,.12)}
.vid-poster{position:relative;overflow:hidden}
.vid-poster img{width:100%;aspect-ratio:16/10;object-fit:cover;transition:transform .4s}
.vid-card:hover .vid-poster img{transform:scale(1.05)}
.play-btn{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;background:rgba(0,0,0,.35);opacity:0;transition:opacity .3s;border:none;cursor:pointer;font-size:2.4rem;color:#fff}
.vid-card:hover .play-btn{opacity:1}
.vid-tag{position:absolute;top:.6rem;left:.6rem;background:var(--accent);color:#fff;font-size:.7rem;padding:.2rem .6rem;border-radius:4px}
.vid-body{padding:1rem}
.vid-body h3{font-size:1rem;font-weight:600;color:var(--heading);margin-bottom:.4rem;line-height:1.4}
.vid-body p{font-size:.85rem;color:var(--txt-dim);margin-bottom:.5rem;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.vid-meta{font-size:.75rem;color:var(--silver)}

/* Inner Hero */
.inner-hero{display:grid;grid-template-columns:1fr 1fr;gap:2rem;align-items:center;padding:2rem 0}
.inner-panel .brow{font-size:.8rem;letter-spacing:.12em;color:var(--accent);margin-bottom:.5rem}
.inner-panel h1{font-size:1.9rem;font-weight:800;color:var(--heading);margin-bottom:.8rem;line-height:1.3}
.inner-desc{color:var(--txt);font-size:.95rem;line-height:1.7;margin-bottom:1.2rem}
.inner-kpi{display:flex;gap:1.5rem}
.kpi-box{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:.8rem 1.2rem;text-align:center}
.kpi-box strong{display:block;font-size:1.3rem;color:var(--accent-lt)}
.kpi-box span{font-size:.75rem;color:var(--txt-dim)}
.vis-card{border-radius:var(--radius);overflow:hidden}
.vis-card img{width:100%;border-radius:var(--radius)}

/* Mini Grid */
.mini-g{display:grid;grid-template-columns:repeat(4,1fr);gap:var(--gap)}
.mini-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:1.3rem;transition:border-color .2s}
.mini-card:hover{border-color:var(--accent)}
.mini-card h3{font-size:1rem;font-weight:600;color:var(--heading);margin-bottom:.5rem}
.mini-card p{font-size:.85rem;color:var(--txt-dim);line-height:1.6}
.step-num{font-size:2rem;font-weight:800;color:var(--accent);display:block;margin-bottom:.3rem}

/* Expert Grid */
.exp-g{display:grid;grid-template-columns:repeat(2,1fr);gap:var(--gap)}
.exp-card{display:flex;gap:1.2rem;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:1.2rem;transition:border-color .2s}
.exp-card:hover{border-color:var(--accent)}
.exp-card img{width:140px;height:180px;object-fit:cover;border-radius:var(--radius);flex-shrink:0}
.exp-info h3{font-size:1rem;font-weight:600;color:var(--heading);margin-bottom:.4rem}
.exp-info p{font-size:.85rem;color:var(--txt-dim);line-height:1.6;margin-bottom:.3rem}
.exp-acts{display:flex;gap:.6rem;margin-top:.6rem}
.exp-acts a{font-size:.8rem;padding:.35rem .8rem;border-radius:6px;border:1px solid var(--accent);color:var(--accent-lt);transition:background .2s}
.exp-acts a:hover{background:var(--accent-bg)}

/* Dual Section */
.dual{display:grid;grid-template-columns:1fr 1fr;gap:2rem;align-items:center}
.dual p{font-size:.95rem;line-height:1.7;margin-bottom:1rem}

/* How-to Grid */
.how-g{display:grid;grid-template-columns:repeat(4,1fr);gap:var(--gap)}

/* FAQ */
.faq-list{max-width:800px;margin:0 auto}
.faq-item{border:1px solid var(--border);border-radius:var(--radius);margin-bottom:.8rem;overflow:hidden}
.faq-q{padding:1rem 1.2rem;background:var(--surface);color:var(--heading);font-weight:600;cursor:pointer;display:flex;justify-content:space-between;align-items:center;font-size:.95rem}
.faq-q::after{content:"+";font-size:1.2rem;color:var(--accent)}
.faq-a{padding:0 1.2rem;max-height:0;overflow:hidden;transition:max-height .3s,padding .3s;font-size:.9rem;color:var(--txt-dim);line-height:1.7}
.faq-item.open .faq-a{max-height:300px;padding:1rem 1.2rem}
.faq-item.open .faq-q::after{content:"-"}

/* Reviews */
.rev-g{display:grid;grid-template-columns:repeat(2,1fr);gap:var(--gap)}
.rev-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:1.3rem}
.rev-card .stars{color:#FFB800;font-size:1rem;margin-bottom:.5rem}
.rev-card blockquote{font-size:.9rem;color:var(--txt);line-height:1.7;margin-bottom:.6rem;font-style:italic}
.rev-card cite{font-size:.8rem;color:var(--txt-dim);font-style:normal}

/* Tags */
.tags{display:flex;flex-wrap:wrap;gap:.5rem;justify-content:center}
.tags span{background:var(--surface);border:1px solid var(--border);border-radius:20px;padding:.35rem .9rem;font-size:.8rem;color:var(--txt-dim)}

/* Contact Grid */
.contact-g{display:grid;grid-template-columns:1fr 1fr;gap:var(--gap)}
.contact-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:1.5rem}
.contact-card h3{font-size:1.1rem;font-weight:600;color:var(--heading);margin-bottom:.8rem}
.contact-card p{font-size:.88rem;color:var(--txt-dim);margin-bottom:.4rem;line-height:1.6}

/* QR */
.qr-row{display:flex;gap:1rem;margin-top:.8rem}
.qr-card{text-align:center}
.qr-card img{width:132px;height:132px;border-radius:8px;border:1px solid var(--border)}
.qr-card span{display:block;font-size:.75rem;color:var(--txt-dim);margin-top:.3rem}

/* Share */
.share-row{display:flex;gap:.6rem;justify-content:center;flex-wrap:wrap}
.share-row a{display:inline-flex;align-items:center;gap:.3rem;padding:.45rem 1rem;border-radius:20px;border:1px solid var(--border);font-size:.82rem;color:var(--txt);transition:border-color .2s,color .2s}
.share-row a:hover{border-color:var(--accent);color:var(--accent-lt)}

/* MCP */
.mcp-g{display:grid;grid-template-columns:repeat(3,1fr);gap:var(--gap)}
.mcp-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:1.2rem;cursor:pointer;transition:border-color .2s}
.mcp-card:hover{border-color:var(--accent)}
.mcp-card h4{font-size:.95rem;color:var(--heading);margin-bottom:.4rem}
.mcp-card p{font-size:.82rem;color:var(--txt-dim)}
.mcp-status{margin-top:1rem;padding:1rem;border:1px dashed var(--border);border-radius:var(--radius);font-size:.85rem;color:var(--txt-dim);text-align:center}

/* Footer */
.ft{background:var(--surface);border-top:1px solid var(--border);padding:2.5rem 0 1.5rem;margin-top:3rem}
.ft-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:2rem;max-width:1280px;margin:0 auto;padding:0 var(--gap)}
.ft-brand{display:flex;align-items:center;gap:.6rem;margin-bottom:.8rem}
.ft-col h4{font-size:.9rem;font-weight:600;color:var(--heading);margin-bottom:.8rem}
.ft-col a{display:block;font-size:.85rem;color:var(--txt-dim);margin-bottom:.4rem;transition:color .2s}
.ft-col a:hover{color:var(--accent-lt)}
.ft-col p{font-size:.82rem;color:var(--txt-dim);line-height:1.6;margin-bottom:.3rem}

/* Responsive */
@media(max-width:1024px){
  .vid-grid{grid-template-columns:repeat(2,1fr)}
  .mini-g,.how-g{grid-template-columns:repeat(2,1fr)}
  .exp-g{grid-template-columns:1fr}
  .ft-grid{grid-template-columns:1fr 1fr}
  .mcp-g{grid-template-columns:repeat(2,1fr)}
  .dual,.inner-hero{grid-template-columns:1fr}
  .contact-g{grid-template-columns:1fr}
  .rev-g{grid-template-columns:1fr}
}
@media(max-width:768px){
  .hd-nav{display:none;flex-direction:column;position:absolute;top:100%;left:0;right:0;background:var(--surface);border-bottom:1px solid var(--border);padding:1rem}
  .hd-nav.open{display:flex}
  .hd-toggle{display:block}
  .vid-grid{grid-template-columns:1fr}
  .mini-g,.how-g{grid-template-columns:1fr}
  .ft-grid{grid-template-columns:1fr}
  .hero-overlay{padding:1.5rem 2rem}
  .hero-overlay h1{font-size:1.5rem}
  .hero-kpi{flex-wrap:wrap;gap:1rem}
  .mcp-g{grid-template-columns:1fr}
}