/* TuneRouter.ai — shared stylesheet */
:root{
  --blue:#0057FF;
  --blue-dark:#003BB3;
  --blue-light:#E8F0FF;
  --ink:#0F1B33;
  --gray:#5A6B8C;
  --line:#E2E8F5;
  --bg:#FFFFFF;
  --bg-soft:#F6F9FF;
  --gold:#C0B283;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;color:var(--ink);background:var(--bg);line-height:1.55}
a{color:var(--blue);text-decoration:none}
.container{max-width:1120px;margin:0 auto;padding:0 24px}

/* Nav */
nav{position:sticky;top:0;background:rgba(255,255,255,.95);backdrop-filter:blur(8px);border-bottom:1px solid var(--line);z-index:100}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:58px}
.logo{display:flex;align-items:center;gap:10px;font-weight:700;font-size:20px;color:var(--ink)}
.logo-mark{width:30px;height:30px;border-radius:8px;background:linear-gradient(135deg,var(--blue),#33AEFF);display:flex;align-items:center;justify-content:center;color:#fff;font-size:15px;font-weight:800}
.nav-links{display:flex;gap:22px;align-items:center;font-size:15.5px}
.nav-links a{color:var(--gray);font-weight:500}
.nav-links a:hover{color:var(--blue)}
.nav-links a.active{color:var(--blue);font-weight:700}
.nav-links a.btn-primary,.nav-links a.btn-primary:hover{color:#fff}
.lang-switch{border:1px solid var(--line);border-radius:100px;padding:3px 12px !important;font-size:13.5px;font-weight:600;color:var(--ink)}
.lang-switch:hover{border-color:var(--blue);color:var(--blue)}
.btn{display:inline-block;font-weight:600;font-size:15.5px;border-radius:8px;padding:9px 22px;transition:.2s;cursor:pointer;border:1px solid transparent}
.btn-primary{background:var(--blue);color:#fff}
.btn-primary:hover{background:var(--blue-dark)}
.btn-outline{border-color:var(--blue);color:var(--blue);background:#fff}
.btn-outline:hover{background:var(--blue-light)}

/* Hero */
.hero{padding:58px 0 46px;background:linear-gradient(180deg,#FFFFFF 0%,var(--bg-soft) 100%);text-align:center}
.badge{display:inline-block;background:var(--blue-light);color:var(--blue);font-size:14px;font-weight:600;padding:5px 16px;border-radius:100px;margin-bottom:18px}
.hero h1{font-size:clamp(32px,4.6vw,52px);line-height:1.18;font-weight:800;letter-spacing:-.01em;max-width:860px;margin:0 auto 18px}
.hero h1 .hl{color:var(--blue)}
.hero p{font-size:clamp(17px,1.9vw,20px);color:var(--gray);max-width:780px;margin:0 auto 28px}
.hero-btns{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}
.hero-btns .btn{padding:12px 30px;font-size:16.5px}
.hero-note{margin-top:18px;font-size:14.5px;color:var(--gray)}

/* Page hero (subpages) */
.page-hero{background:linear-gradient(180deg,#FFFFFF 0%,var(--bg-soft) 100%);text-align:center;padding:46px 0 38px;border-bottom:1px solid var(--line)}
.page-hero h1{font-size:clamp(26px,3.6vw,38px);font-weight:800;letter-spacing:-.01em;margin-bottom:10px}
.page-hero p{color:var(--gray);font-size:17.5px;max-width:760px;margin:0 auto}

/* Stats */
.stats{border-top:1px solid var(--line);border-bottom:1px solid var(--line);background:#fff}
.stats-inner{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;padding:26px 0;text-align:center}
.stat b{display:block;font-size:32px;font-weight:800;color:var(--blue);letter-spacing:-.02em;line-height:1.2}
.stat span{font-size:15px;color:var(--gray)}

/* Sections */
section{padding:54px 0}
section.soft{background:var(--bg-soft)}
.sec-head{text-align:center;max-width:760px;margin:0 auto 32px}
.sec-head h2{font-size:clamp(25px,3.4vw,35px);font-weight:800;letter-spacing:-.01em;margin-bottom:12px}
.sec-head p{color:var(--gray);font-size:18px}
.section-link{display:inline-block;margin-top:16px;font-size:15.5px;font-weight:600;color:var(--blue)}

/* Cards */
.grid{display:grid;gap:16px}
.grid-4{grid-template-columns:repeat(4,1fr)}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-2{grid-template-columns:repeat(2,1fr)}
.card{background:#fff;border:1px solid var(--line);border-radius:14px;padding:22px;transition:.2s}
.card:hover{border-color:var(--blue);box-shadow:0 8px 28px rgba(0,87,255,.08);transform:translateY(-2px)}
.card.soft{background:var(--bg-soft)}
.card .icon{width:40px;height:40px;border-radius:10px;background:var(--blue-light);display:flex;align-items:center;justify-content:center;font-size:19px;margin-bottom:12px}
.card h3{font-size:18.5px;font-weight:700;margin-bottom:6px}
.card p{font-size:15.5px;color:var(--gray)}
.card .tagline{margin-top:10px;font-size:14px;color:var(--blue);font-weight:600}
.card .sub{font-size:13.5px;color:var(--gray);margin-bottom:8px}

/* Model tags */
.mtags{display:flex;flex-wrap:wrap;gap:8px}
.mtag{background:var(--blue-light);color:var(--blue-dark);font-size:14.5px;font-weight:500;padding:5px 13px;border-radius:100px}
.mtag.gold{background:#F5F0E1;color:#8A7A45}
.cap-row{display:flex;flex-wrap:wrap;gap:10px;justify-content:center;margin-top:18px}
.cap{border:1px solid var(--line);border-radius:8px;padding:7px 14px;font-size:14.5px;color:var(--gray);background:#fff}
.cap b{color:var(--ink)}
.note{text-align:center;font-size:13.5px;color:var(--gray);margin-top:16px}
.mods{display:flex;flex-wrap:wrap;gap:6px;margin-top:12px}
.mod{font-size:13px;font-weight:600;color:var(--blue-dark);background:var(--blue-light);border-radius:6px;padding:3px 9px}

/* Model capability rows */
.model-rows{display:grid;grid-template-columns:repeat(2,1fr);gap:10px;margin-top:14px}
.model-row{display:flex;justify-content:space-between;align-items:center;background:#fff;border:1px solid var(--line);border-radius:10px;padding:11px 16px;font-size:15.5px}
.model-row b{font-weight:700}
.model-row span{color:var(--gray);font-size:14px}

/* Bars */
.bars{max-width:780px;margin:0 auto;display:flex;flex-direction:column;gap:12px}
.bar-row{display:grid;grid-template-columns:120px 1fr 52px;align-items:center;gap:12px;font-size:15px}
.bar-track{background:var(--blue-light);border-radius:100px;height:14px;overflow:hidden}
.bar-fill{height:100%;background:linear-gradient(90deg,var(--blue),#33AEFF);border-radius:100px}
.bar-val{font-weight:700;color:var(--blue-dark);text-align:right;font-size:14.5px}

/* Tables */
.tbl{width:100%;border-collapse:collapse;background:#fff;font-size:15.5px}
.tbl-wrap{border-radius:14px;overflow:hidden;border:1px solid var(--line)}
.tbl th{background:var(--bg-soft);color:var(--ink);font-weight:700;text-align:left;padding:13px 18px;border-bottom:1px solid var(--line);font-size:15px}
.tbl td{padding:12px 18px;border-bottom:1px solid var(--line);color:var(--gray)}
.tbl tr:last-child td{border-bottom:none}
.tbl .good{color:var(--blue);font-weight:600}
.tbl .bad{color:#B4552D}

/* Steps */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.step{background:#fff;border:1px solid var(--line);border-radius:14px;padding:22px;position:relative}
.step .top{display:flex;align-items:center;justify-content:space-between;margin-bottom:12px}
.step .num{width:32px;height:32px;border-radius:50%;background:var(--blue);color:#fff;font-weight:700;font-size:15px;display:flex;align-items:center;justify-content:center}
.step .time{font-size:13.5px;color:var(--gold);font-weight:700}
.step h3{font-size:18px;font-weight:700;margin-bottom:6px}
.step p{font-size:15.5px;color:var(--gray)}

/* Code */
.code-wrap{max-width:800px;margin:0 auto;background:#0F1B33;border-radius:14px;overflow:hidden;box-shadow:0 12px 40px rgba(15,27,51,.18)}
.code-head{display:flex;align-items:center;gap:8px;padding:11px 18px;border-bottom:1px solid rgba(255,255,255,.08)}
.dot{width:11px;height:11px;border-radius:50%}
.code-title{margin-left:8px;font-size:13.5px;color:#8FA3C8;font-family:Consolas,monospace}
pre{padding:18px 22px;overflow-x:auto;font-family:Consolas,"SF Mono",Menlo,monospace;font-size:15px;line-height:1.7;color:#D7E3F8}
.k{color:#79B8FF}.s{color:#A5D6A7}.c{color:#5A7096}.f{color:#FFCB6B}
.tools{display:flex;flex-wrap:wrap;gap:10px;justify-content:center;margin-top:22px}
.tool{border:1px solid var(--line);border-radius:8px;padding:8px 16px;font-size:15px;font-weight:600;color:var(--ink);background:#fff}
.tool:hover{border-color:var(--blue);color:var(--blue)}

/* Pricing */
.price-card{background:#fff;border:1px solid var(--line);border-radius:14px;padding:24px;text-align:center}
.price-card.hot{border-color:var(--blue);box-shadow:0 8px 28px rgba(0,87,255,.10)}
.price-card .plan{font-size:15.5px;font-weight:700;color:var(--gray)}
.price-card .price{font-size:40px;font-weight:800;color:var(--ink);margin:8px 0 2px}
.price-card .price small{font-size:15px;color:var(--gray);font-weight:500}
.price-card ul{list-style:none;text-align:left;margin:14px 0 0;font-size:15px;color:var(--gray)}
.price-card ul li{padding:5px 0 5px 22px;position:relative}
.price-card ul li::before{content:"✓";position:absolute;left:0;color:var(--blue);font-weight:700}
.check-list{list-style:none;font-size:16px;color:var(--gray)}
.check-list li{padding:6px 0 6px 26px;position:relative}
.check-list li::before{content:"✓";position:absolute;left:0;color:var(--blue);font-weight:700}

/* SLA chips */
.sla{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.sla-item{background:#fff;border:1px solid var(--line);border-radius:14px;padding:18px 20px;display:flex;gap:12px;align-items:flex-start}
.sla-item .em{font-size:22px;line-height:1.3}
.sla-item b{display:block;font-size:16px;margin-bottom:3px}
.sla-item span{font-size:14px;color:var(--gray)}

/* FAQ */
.faq-list{max-width:820px;margin:0 auto}
details.faq{border:1px solid var(--line);border-radius:12px;background:#fff;padding:16px 20px;margin-bottom:10px}
details.faq summary{font-weight:700;font-size:16.5px;cursor:pointer;list-style:none;display:flex;justify-content:space-between;align-items:center}
details.faq summary::-webkit-details-marker{display:none}
details.faq summary::after{content:"+";color:var(--blue);font-size:20px;font-weight:700}
details.faq[open] summary::after{content:"–"}
details.faq p{margin-top:10px;color:var(--gray);font-size:15.5px}

/* CTA */
.cta{text-align:center;background:linear-gradient(135deg,var(--blue) 0%,#33AEFF 100%);border-radius:20px;padding:46px 28px;color:#fff}
.cta h2{font-size:clamp(25px,3.5vw,35px);font-weight:800;margin-bottom:12px}
.cta p{font-size:17.5px;opacity:.92;margin-bottom:26px}
.cta .btn{background:#fff;color:var(--blue);font-size:16.5px;padding:12px 32px}
.cta .btn:hover{background:var(--blue-light)}
.cta .contact{margin-top:18px;font-size:15px;opacity:.9}

/* Footer */
footer{border-top:1px solid var(--line);background:#fff}
.foot-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1.5fr;gap:28px;padding:34px 0 22px}
.foot-grid h4{font-size:15px;margin-bottom:10px;color:var(--ink)}
.foot-grid a{display:block;color:var(--gray);font-size:14.5px;padding:3px 0}
.foot-grid a:hover{color:var(--blue)}
.foot-brand p{font-size:14.5px;color:var(--gray);margin-top:10px;max-width:300px}
.foot-contact{font-size:14.5px;color:var(--gray);line-height:1.9}
.foot-contact b{color:var(--ink)}
.foot-bottom{border-top:1px solid var(--line);padding:16px 0;font-size:13.5px;color:var(--gray);line-height:1.8;text-align:center}

/* Tune engine flow */
.tune-flow{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.tf-card{background:#fff;border:1px solid var(--line);border-radius:14px;padding:20px;position:relative}
.tf-card .no{position:absolute;top:14px;right:18px;font-size:30px;font-weight:800;color:var(--blue-light);line-height:1}
.tf-card h3{font-size:17px;font-weight:700;margin-bottom:6px}
.tf-card p{font-size:14.5px;color:var(--gray)}
.tune-results{margin-top:22px;display:flex;flex-wrap:wrap;gap:10px;justify-content:center}
.tres{background:#fff;border:1px solid var(--line);border-radius:100px;padding:8px 18px;font-size:14.5px;color:var(--gray)}
.tres b{color:var(--blue)}

/* Hot model cards */
.hm-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.hm-card{background:#fff;border:1px solid var(--line);border-radius:12px;padding:16px 18px;transition:.2s}
.hm-card:hover{border-color:var(--blue);box-shadow:0 6px 20px rgba(0,87,255,.08);transform:translateY(-2px)}
.hm-card .nm{display:flex;justify-content:space-between;align-items:center;gap:8px;font-weight:700;font-size:16px}
.hm-tag{font-size:12.5px;background:var(--blue-light);color:var(--blue-dark);border-radius:6px;padding:2px 8px;font-weight:600;white-space:nowrap}
.hm-card p{font-size:13.5px;color:var(--gray);margin-top:6px}

/* Quick links */
.quick-row{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
a.quick{display:flex;flex-direction:column;gap:4px;padding:20px 22px}
a.quick b{font-size:17px;color:var(--ink)}
a.quick span{font-size:14.5px;color:var(--gray)}
a.quick:hover{border-color:var(--blue)}
a.quick:hover b{color:var(--blue)}

@media(max-width:960px){
  .tune-flow,.hm-grid{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:860px){
  .grid-4{grid-template-columns:repeat(2,1fr)}
  .sla{grid-template-columns:repeat(2,1fr)}
  .foot-grid{grid-template-columns:1fr 1fr}
  .model-rows{grid-template-columns:1fr}
}
@media(max-width:860px){
  .grid-3,.steps,.grid-2{grid-template-columns:1fr}
  .stats-inner{grid-template-columns:repeat(2,1fr);gap:20px 0}
  .nav-links a:not(.btn):not(.lang-switch){display:none}
  .grid-4{grid-template-columns:1fr}
  .sla{grid-template-columns:1fr}
  .tbl{font-size:14px}
  .foot-grid{grid-template-columns:1fr}
  .bar-row{grid-template-columns:96px 1fr 48px;font-size:14px}
}

/* VastLLM */
.crumbs{font-size:14px;color:var(--gray);padding:0 0 14px}
.crumbs a{color:var(--gray)}.crumbs a:hover{color:var(--blue)}
.mhead{display:flex;align-items:center;justify-content:center;gap:14px;margin-bottom:6px}
.mhead h1{margin:0}
.plogo{height:30px;width:auto;max-width:130px;object-fit:contain}
.vfilters{display:flex;gap:10px;justify-content:center;flex-wrap:wrap;margin-bottom:14px}
.vsearch{border:1px solid var(--line);border-radius:10px;padding:10px 16px;font-size:15px;width:300px;outline:none}
.vsearch:focus{border-color:var(--blue)}
.vsel{border:1px solid var(--line);border-radius:10px;padding:10px 12px;font-size:14.5px;background:#fff;color:var(--ink)}
.vchips{display:flex;gap:8px;justify-content:center;flex-wrap:wrap;margin-bottom:24px}
.vchip{border:1px solid var(--line);background:#fff;color:var(--gray);border-radius:100px;padding:6px 16px;font-size:14px;font-weight:600;cursor:pointer;transition:.15s}
.vchip.on{background:var(--blue);border-color:var(--blue);color:#fff}
.vgrid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.vcard{display:block;background:#fff;border:1px solid var(--line);border-radius:14px;padding:18px;transition:.2s;color:var(--ink)}
.vcard:hover{border-color:var(--blue);box-shadow:0 8px 28px rgba(0,87,255,.08);transform:translateY(-2px)}
.vhead{display:flex;align-items:center;gap:10px;margin-bottom:8px}
.vhead b{font-size:16.5px}
.vpub{display:block;font-size:13px;color:var(--gray)}
.vcard p{font-size:13.5px;color:var(--gray);min-height:40px}
.vfoot{display:flex;justify-content:space-between;align-items:center;margin-top:10px;font-size:13.5px}
.vprice{color:var(--blue-dark);font-weight:700}
.vio{color:var(--gray)}
.spec-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-top:26px}
.spec{background:#fff;border:1px solid var(--line);border-radius:12px;padding:16px;text-align:center}
.spec b{display:block;font-size:20px;color:var(--blue);font-weight:800}
.spec span{font-size:13.5px;color:var(--gray)}
.endpoint{font-family:Consolas,monospace;background:var(--blue-light);color:var(--blue-dark);border-radius:8px;padding:3px 10px;font-size:14px}
.codebody{margin:0;padding:18px 20px;overflow-x:auto;color:#DCE6F5;font-family:Consolas,Menlo,monospace;font-size:14px;line-height:1.7}
@media(max-width:900px){.vgrid{grid-template-columns:repeat(2,1fr)}.spec-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:620px){.vgrid{grid-template-columns:1fr}.vsearch{width:100%}}