/*
 * 17c一起草 / mupyhqr.cn 原创样式
 * 设计哲学：赛道工坊影像馆。所有视觉选择应强化“专业修车公司 + 视频社区 + AI 检修”的可信技术气质，避免通用紫色渐变、过度圆角与居中模板化布局。
 */
:root{
    --ink:#071112;
    --ink-2:#101b1d;
    --panel:#142325;
    --panel-soft:#1a2c2f;
    --line:rgba(133,196,190,.22);
    --teal:#1cc7bd;
    --teal-soft:#7edbd5;
    --orange:#ff7d2b;
    --amber:#f6bb57;
    --paper:#eef7f5;
    --muted:#a8bbb8;
    --danger:#e85d45;
    --shadow:0 24px 70px rgba(0,0,0,.38);
    --radius:18px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;background:var(--ink);color:var(--paper)}
body{margin:0;font-family:"Source Han Sans SC","Microsoft YaHei",Arial,sans-serif;line-height:1.72;background:radial-gradient(circle at 78% 8%,rgba(28,199,189,.18),transparent 32rem),linear-gradient(180deg,#071112,#0b1516 38%,#0a1011);color:var(--paper)}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
button,input{font:inherit}
::selection{background:var(--orange);color:#111}
.skip-reader{position:absolute;left:-999px}
.site-header{position:relative;z-index:10;border-bottom:1px solid var(--line);background:rgba(7,17,18,.92);backdrop-filter:blur(18px)}
.nav-rail{width:min(1180px,calc(100% - 34px));margin:0 auto;display:flex;align-items:center;gap:22px;min-height:92px}
.brand-mark{display:flex;align-items:center;gap:13px;min-width:210px}
.brand-mark img{width:60px;height:60px;border:1px solid rgba(255,255,255,.16);box-shadow:0 14px 32px rgba(28,199,189,.18)}
.brand-mark b{display:block;font-size:28px;line-height:1;color:#fff;letter-spacing:.06em}
.brand-mark em{display:block;font-style:normal;font-size:12px;color:var(--teal-soft);letter-spacing:.16em;text-transform:uppercase}
.main-nav{display:flex;align-items:center;gap:6px;flex:1;overflow:auto;padding:8px 0}
.main-nav a{position:relative;white-space:nowrap;color:#c6d8d5;padding:10px 13px;border:1px solid transparent;font-size:15px}
.main-nav a:hover,.main-nav a.is-active{color:#fff;border-color:var(--line);background:linear-gradient(135deg,rgba(28,199,189,.14),rgba(255,125,43,.08))}
.main-nav a.is-active:after{content:"";position:absolute;left:14px;right:14px;bottom:4px;height:2px;background:var(--orange)}
.nav-cta{white-space:nowrap;color:#111;background:var(--orange);font-weight:800;padding:12px 18px;clip-path:polygon(10px 0,100% 0,calc(100% - 10px) 100%,0 100%);box-shadow:0 12px 30px rgba(255,125,43,.22)}
.search-strip{width:min(1180px,calc(100% - 34px));margin:0 auto 18px;display:grid;grid-template-columns:1fr;align-items:center}
.fake-search{border:1px solid var(--line);background:linear-gradient(90deg,rgba(20,35,37,.88),rgba(10,20,21,.76));padding:16px 18px;box-shadow:0 18px 50px rgba(0,0,0,.20)}
.fake-search label{display:block;color:var(--teal-soft);font-size:14px;margin-bottom:9px;letter-spacing:.06em}
.search-row{display:grid;grid-template-columns:1fr 132px;gap:10px}
.search-row input{width:100%;border:1px solid rgba(126,219,213,.26);background:#071112;color:#fff;padding:13px 14px;outline:none}
.search-row input:focus{border-color:var(--teal);box-shadow:0 0 0 4px rgba(28,199,189,.13)}
.search-row button,.primary-btn,.ghost-btn,.share-btn{border:0;cursor:pointer;padding:12px 17px;font-weight:800;letter-spacing:.04em}
.search-row button,.primary-btn{background:var(--teal);color:#042021}
.ghost-btn,.share-btn{background:transparent;color:#fff;border:1px solid var(--line)}
.search-hint{margin:9px 0 0;color:var(--muted);font-size:13px}
.hero{position:relative;min-height:620px;display:grid;align-items:stretch;overflow:hidden;border-bottom:1px solid var(--line)}
.hero:before{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(7,17,18,.96) 0%,rgba(7,17,18,.84) 29%,rgba(7,17,18,.22) 67%,rgba(7,17,18,.72) 100%),radial-gradient(circle at 16% 78%,rgba(255,125,43,.24),transparent 26rem);z-index:1}
.hero>img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;filter:saturate(1.05) contrast(1.03)}
.hero-content{position:relative;z-index:2;width:min(1180px,calc(100% - 34px));margin:0 auto;display:grid;grid-template-columns:minmax(0,610px) minmax(280px,360px);gap:48px;align-items:center;padding:74px 0 86px}
.kicker{color:var(--orange);font-weight:900;letter-spacing:.18em;text-transform:uppercase;margin:0 0 13px;font-size:13px}
h1,h2,h3,p{margin-top:0}
h1{font-size:clamp(42px,6vw,86px);line-height:.98;letter-spacing:-.07em;margin-bottom:24px}
h1 span,.section-title span{color:var(--teal)}
.hero-copy{font-size:19px;color:#d4e6e3;max-width:56ch}
.metric-stack{display:grid;gap:12px;align-self:end}
.metric{border:1px solid var(--line);background:rgba(7,17,18,.66);padding:18px;box-shadow:var(--shadow);transform:skewX(-4deg)}
.metric b{display:block;font-size:34px;line-height:1;color:#fff}.metric span{color:var(--muted);font-size:13px}.metric>*{transform:skewX(4deg)}
.action-row{display:flex;gap:12px;flex-wrap:wrap;margin-top:30px}
main{overflow:hidden}.section{width:min(1180px,calc(100% - 34px));margin:0 auto;padding:80px 0}.section.compact{padding:54px 0}
.section-title{display:grid;grid-template-columns:1.05fr .95fr;gap:28px;align-items:end;margin-bottom:34px}.section-title h2{font-size:clamp(31px,4vw,54px);line-height:1.05;letter-spacing:-.05em}.section-title p{color:var(--muted);margin-bottom:6px}
.diagonal-panel{border:1px solid var(--line);background:linear-gradient(135deg,rgba(20,35,37,.95),rgba(9,18,19,.92));box-shadow:var(--shadow);padding:34px;position:relative}.diagonal-panel:after{content:"";position:absolute;right:-1px;top:-1px;width:160px;height:5px;background:var(--orange)}
.feature-grid{display:grid;grid-template-columns:1.25fr .75fr;gap:22px}.feature-grid.reverse{grid-template-columns:.8fr 1.2fr}.feature-grid img{height:100%;min-height:330px;object-fit:cover;border:1px solid var(--line)}
.video-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.video-card{position:relative;border:1px solid var(--line);background:#0f1b1d;overflow:hidden;min-height:310px;box-shadow:0 18px 52px rgba(0,0,0,.28)}.video-card img{height:176px;width:100%;object-fit:cover;filter:saturate(1.03)}.video-card .body{padding:18px}.video-card h3{font-size:20px;line-height:1.28}.video-card p{color:var(--muted);font-size:14px}.play-hover{position:absolute;inset:0;display:grid;place-items:center;background:rgba(7,17,18,.08);transition:.22s ease}.play-hover i{width:76px;height:76px;border-radius:50%;border:1px solid rgba(255,255,255,.42);background:rgba(255,125,43,.88);clip-path:circle(50%);display:grid;place-items:center;opacity:0;transform:scale(.82);transition:.22s ease}.play-hover i:before{content:"";width:0;height:0;border-top:14px solid transparent;border-bottom:14px solid transparent;border-left:23px solid #111;margin-left:5px}.video-card:hover .play-hover,.video-card.is-playing .play-hover{background:rgba(7,17,18,.52)}.video-card:hover .play-hover i,.video-card.is-playing .play-hover i{opacity:1;transform:scale(1)}
.tag-row{display:flex;flex-wrap:wrap;gap:8px;margin-top:14px}.tag-row span{font-size:12px;color:#cde;border:1px solid var(--line);padding:5px 9px;background:rgba(28,199,189,.08)}
.split-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.info-card{border:1px solid var(--line);background:rgba(20,35,37,.72);padding:22px;min-height:168px}.info-card h3{font-size:21px;color:#fff}.info-card p{color:var(--muted)}.info-card strong{color:var(--orange)}
.steps{counter-reset:step;display:grid;grid-template-columns:repeat(4,1fr);gap:14px}.step{counter-increment:step;border:1px solid var(--line);background:#0e1a1c;padding:22px;position:relative}.step:before{content:"0" counter(step);display:block;color:var(--orange);font-weight:900;font-size:25px;margin-bottom:16px}.step h3{font-size:19px}.step p{color:var(--muted);font-size:14px}
.expert-row{display:grid;grid-template-columns:1fr 1fr;gap:24px;align-items:center}.expert-row img{border:1px solid var(--line);box-shadow:var(--shadow)}.credential{display:grid;gap:10px}.credential li{list-style:none;padding:12px 14px;border-left:4px solid var(--teal);background:rgba(28,199,189,.08);color:#d9ece9}
.comment-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}.comment{border:1px solid var(--line);background:linear-gradient(180deg,rgba(20,35,37,.9),rgba(12,21,22,.86));padding:19px;min-height:210px}.comment b{color:#fff}.comment p{font-size:14px;color:var(--muted)}.stars{color:var(--amber);letter-spacing:.08em}
.faq-list{display:grid;gap:12px}.faq-item{border:1px solid var(--line);background:rgba(20,35,37,.7)}.faq-q{width:100%;text-align:left;background:transparent;color:#fff;border:0;cursor:pointer;padding:18px 20px;font-weight:900;display:flex;justify-content:space-between;gap:20px}.faq-q:after{content:"+";color:var(--orange);font-size:24px}.faq-item.is-open .faq-q:after{content:"–"}.faq-a{display:none;padding:0 20px 19px;color:var(--muted)}.faq-item.is-open .faq-a{display:block}
.json-box{overflow:auto;background:#061010;border:1px solid var(--line);padding:18px;color:#bfe9e5;font-size:13px;white-space:pre-wrap}
.inner-hero{width:min(1180px,calc(100% - 34px));margin:42px auto 0;display:grid;grid-template-columns:1.1fr .9fr;gap:30px;align-items:center}.inner-hero img{border:1px solid var(--line);box-shadow:var(--shadow)}.inner-hero h1{font-size:clamp(38px,5vw,68px)}
.content-flow{width:min(980px,calc(100% - 34px));margin:0 auto;padding:60px 0}.content-flow h2{font-size:35px}.content-flow p{color:#c6d8d5}.content-flow a{color:var(--teal-soft);border-bottom:1px solid rgba(126,219,213,.35)}
.column-callouts{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin:26px 0}.column-callouts a{display:block;border:1px solid var(--line);padding:18px;background:rgba(20,35,37,.78);color:#fff}.column-callouts span{display:block;color:var(--muted);font-size:13px;margin-top:6px}
.site-footer{border-top:1px solid var(--line);background:#071112;margin-top:60px}.footer-matrix{width:min(1180px,calc(100% - 34px));margin:0 auto;padding:56px 0;display:grid;grid-template-columns:1fr .9fr;gap:34px}.footer-matrix h2{font-size:31px;line-height:1.18}.footer-matrix p{color:var(--muted)}.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:0}.contact-grid div{border:1px solid var(--line);padding:16px;background:rgba(20,35,37,.72)}.contact-grid dt{color:var(--orange);font-size:13px}.contact-grid dd{margin:4px 0 0;color:#fff;font-weight:800;word-break:break-all}.footer-bottom{width:min(1180px,calc(100% - 34px));margin:0 auto;border-top:1px solid var(--line);padding:20px 0 28px;display:flex;justify-content:space-between;gap:20px;color:var(--muted);font-size:14px}.footer-bottom span{margin:0 8px;color:#566}
.notice-band{border:1px dashed rgba(255,125,43,.55);background:rgba(255,125,43,.08);padding:18px;color:#f7d0b5}.ratio-line{height:2px;background:linear-gradient(90deg,var(--orange) 0 31%,var(--teal) 31% 74%,rgba(255,255,255,.15) 74%);margin:20px 0}.brand-table{width:100%;border-collapse:collapse;border:1px solid var(--line);background:rgba(20,35,37,.66)}.brand-table th,.brand-table td{border-bottom:1px solid var(--line);padding:13px;text-align:left}.brand-table th{color:#fff}.brand-table td{color:var(--muted)}
@media (max-width:960px){.nav-rail{flex-wrap:wrap;padding:14px 0}.main-nav{order:3;width:100%}.nav-cta{margin-left:auto}.hero-content,.section-title,.feature-grid,.feature-grid.reverse,.expert-row,.inner-hero,.footer-matrix{grid-template-columns:1fr}.video-grid{grid-template-columns:1fr 1fr}.steps,.comment-grid{grid-template-columns:1fr 1fr}.hero{min-height:auto}.metric-stack{grid-template-columns:repeat(3,1fr)}}
@media (max-width:640px){.brand-mark{min-width:0}.brand-mark span{display:none}.nav-cta{display:none}.search-row{grid-template-columns:1fr}.hero-content{padding:52px 0}.metric-stack,.video-grid,.split-list,.steps,.comment-grid,.contact-grid,.column-callouts{grid-template-columns:1fr}.section{padding:54px 0}.footer-bottom{display:block}.inner-hero{margin-top:24px}}

.logo-wall{display:grid;grid-template-columns:repeat(6,1fr);gap:12px;margin-top:18px}.logo-tile{border:1px solid var(--line);background:linear-gradient(135deg,rgba(28,199,189,.12),rgba(255,125,43,.08));min-height:82px;display:grid;place-items:center;color:#fff;font-weight:900;letter-spacing:.09em;text-align:center;padding:12px}.logo-tile small{display:block;color:var(--muted);font-weight:500;letter-spacing:0;margin-top:4px}.expert-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.expert-card{border:1px solid var(--line);background:rgba(20,35,37,.82);padding:20px;position:relative;overflow:hidden}.expert-card:before{content:"";position:absolute;left:0;top:0;width:5px;height:100%;background:linear-gradient(var(--teal),var(--orange))}.expert-card h3{margin-left:10px}.expert-card p{color:var(--muted);font-size:14px;margin-left:10px}.mini-actions{display:flex;gap:8px;flex-wrap:wrap;margin:14px 0 0 10px}.mini-actions a{border:1px solid var(--line);padding:7px 10px;color:#fff;font-weight:800;font-size:13px}.qr-row{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:18px}.qr-card{display:grid;grid-template-columns:92px 1fr;gap:13px;align-items:center;border:1px solid var(--line);background:rgba(20,35,37,.72);padding:12px}.qr-card img{width:92px;height:92px;object-fit:contain;background:#fff}.qr-card b{display:block;color:#fff}.qr-card span{display:block;color:var(--muted);font-size:13px}@media (max-width:960px){.logo-wall,.expert-grid{grid-template-columns:repeat(2,1fr)}}@media (max-width:640px){.logo-wall,.expert-grid,.qr-row{grid-template-columns:1fr}.qr-card{grid-template-columns:82px 1fr}.qr-card img{width:82px;height:82px}}