:root{
  --bg:#0b0e14; --bg2:#131824; --card:#1a2233; --line:#2a3550;
  --text:#eef2f9; --muted:#a7b3c9; --accent:#ff5a1f; --accent2:#ffb020;
  --green:#22c55e; --radius:16px;
}
*{box-sizing:border-box}
body{margin:0;font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif;background:var(--bg);color:var(--text);line-height:1.6}
.container{max-width:1100px;margin:0 auto;padding:0 20px}
.narrow{max-width:760px}
.navbar{position:sticky;top:0;z-index:10;background:rgba(11,14,20,.92);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.nav-inner{display:flex;align-items:center;gap:16px;padding:14px 20px}
.logo{font-weight:800;font-size:1.25rem;text-decoration:none;color:#fff}
.logo span{color:var(--accent)}
.nav-links{display:flex;gap:16px;margin-left:auto}
.nav-links a{color:var(--muted);text-decoration:none;font-weight:600}
.nav-links a:hover{color:#fff}
.nav-actions{display:flex;gap:8px;align-items:center}
#searchInput{background:var(--bg2);border:1px solid var(--line);color:#fff;padding:8px 12px;border-radius:999px;min-width:200px}
.menu-btn{display:none;background:var(--bg2);border:1px solid var(--line);color:#fff;border-radius:10px;padding:8px 10px}
.hero{background:radial-gradient(800px 400px at 20% 0%,#ff5a1f33,transparent),linear-gradient(180deg,#131824,#0b0e14);padding:56px 0;border-bottom:1px solid var(--line)}
.hero-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:28px;align-items:start}
.badge{display:inline-block;background:#ffffff14;border:1px solid var(--line);padding:6px 12px;border-radius:999px;font-size:.85rem;color:var(--muted);margin-bottom:12px}
h1{font-size:3.2rem;line-height:1.05;margin:.2em 0}
h2{font-size:2rem;margin:0 0 8px}
.lead{color:var(--muted);font-size:1.15rem}
.hero-buttons{display:flex;gap:12px;margin:20px 0}
.btn{padding:12px 20px;border-radius:12px;text-decoration:none;font-weight:700;border:1px solid var(--line)}
.btn.primary{background:var(--accent);border-color:var(--accent);color:#fff}
.btn.secondary{background:transparent;color:#fff}
.stats{display:flex;gap:24px;margin-top:16px}
.stats strong{display:block;font-size:1.5rem}
.stats span{color:var(--muted);font-size:.9rem}
.hero-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:20px}
.car-diagram{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:12px 0}
.car-diagram button{background:var(--bg2);border:1px dashed var(--line);color:#fff;padding:14px;border-radius:12px;cursor:pointer;font-weight:700}
.car-diagram button:hover,.car-diagram button.active{border-color:var(--accent);background:#ff5a1f22}
.hint{color:var(--muted);font-size:.9rem}
.diagram-info{background:#00000040;border:1px solid var(--line);border-radius:12px;padding:12px;min-height:56px}
.section{padding:56px 0}
.section.alt{background:var(--bg2);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.subtitle{color:var(--muted);margin-top:0}
.filter-row{display:flex;gap:8px;flex-wrap:wrap;margin:18px 0}
.chip{background:transparent;border:1px solid var(--line);color:var(--muted);padding:8px 14px;border-radius:999px;cursor:pointer}
.chip.active{background:#fff;color:#000;border-color:#fff}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:16px}
.grid.three{grid-template-columns:repeat(auto-fit,minmax(260px,1fr))}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:18px}
.card h3{margin:0 0 8px}
.card p{color:var(--muted);margin:0 0 10px}
.card ul{margin:0;padding-left:18px;color:#d6deee}
.card .meta{display:flex;justify-content:space-between;margin-top:12px;font-size:.85rem;color:var(--muted)}
.tag{font-size:.75rem;background:#ffffff14;border:1px solid var(--line);padding:2px 8px;border-radius:999px}
.explorer-grid{display:grid;grid-template-columns:340px 1fr;gap:16px;margin-top:16px}
.explorer-list{display:flex;flex-direction:column;gap:8px;max-height:560px;overflow:auto}
.explorer-list button{text-align:left;background:var(--card);border:1px solid var(--line);color:#fff;padding:12px;border-radius:12px;cursor:pointer}
.explorer-list button.active{border-color:var(--accent)}
.detail-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:22px;position:sticky;top:70px}
.detail-meta{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:16px 0}
.detail-meta div{background:#00000030;border:1px solid var(--line);border-radius:12px;padding:10px}
.detail-meta span{display:block;color:var(--muted);font-size:.8rem}
.tip-box{background:#22c55e18;border:1px solid #22c55e55;border-radius:12px;padding:12px}
.table-wrap{overflow:auto;border:1px solid var(--line);border-radius:var(--radius)}
table{width:100%;border-collapse:collapse;background:var(--card)}
th,td{padding:12px 14px;border-bottom:1px solid var(--line);text-align:left}
th{background:#00000040}
details{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:14px 16px;margin:10px 0}
summary{cursor:pointer;font-weight:700}
.breadcrumb{color:var(--muted);margin-bottom:12px}
.breadcrumb a{color:#fff}
.part-hero{display:grid;grid-template-columns:1.2fr .8fr;gap:20px;align-items:start;margin:12px 0 20px}
.part-img{width:100%;border-radius:var(--radius);border:1px solid var(--line);background:var(--card)}
.two-col{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin:16px 0}
.related{display:flex;gap:10px;flex-wrap:wrap;margin-top:20px;align-items:center}
.related a{background:var(--card);border:1px solid var(--line);color:#fff;padding:10px 14px;border-radius:12px;text-decoration:none}
.related a:hover{border-color:var(--accent)}
.guide-img{width:100%;border-radius:12px;border:1px solid var(--line);margin-bottom:10px;background:#0b0e14}
@media(max-width:860px){.part-hero,.two-col{grid-template-columns:1fr}}
footer{padding:28px 0;color:var(--muted)}
.footer-inner{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap}
.small{font-size:.9rem}
@media(max-width:860px){
  .hero-grid,.explorer-grid{grid-template-columns:1fr}
  h1{font-size:2.4rem}
  .nav-links{display:none}
  .nav-links.open{display:flex;position:absolute;top:58px;left:0;right:0;background:var(--bg2);padding:12px 20px;flex-direction:column;border-bottom:1px solid var(--line)}
  .menu-btn{display:block}
  #searchInput{min-width:0;width:140px}
}