:root{
  --bg:#0f172a;
  --bg2:#111c34;
  --card:#1e293b;
  --text:#e2e8f0;
  --muted:#94a3b8;
  --accent:#38bdf8;
  --accent2:#a78bfa;
  --border:#334155;
  --max:1080px;
}
[data-theme="light"]{
  --bg:#f8fafc;
  --bg2:#ffffff;
  --card:#ffffff;
  --text:#0f172a;
  --muted:#475569;
  --accent:#0284c7;
  --accent2:#7c3aed;
  --border:#e2e8f0;
}
*{box-sizing:border-box}
body{
  margin:0;
  font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif;
  background:linear-gradient(180deg,var(--bg),var(--bg2));
  color:var(--text);
  line-height:1.7;
}
a{color:var(--accent)}
.container{max-width:var(--max);margin:0 auto;padding:0 20px}
.site-header{
  position:sticky;top:0;z-index:10;
  backdrop-filter:blur(10px);
  background:color-mix(in srgb,var(--bg) 82%,transparent);
  border-bottom:1px solid var(--border);
}
.nav{display:flex;align-items:center;justify-content:space-between;padding:14px 0}
.brand{font-weight:800;letter-spacing:.02em;text-decoration:none;color:var(--text);font-size:1.1rem}
.brand span{color:var(--accent)}
.nav-links{display:flex;gap:12px;flex-wrap:wrap;align-items:center}
.nav-links a{font-size:.9rem;text-decoration:none;color:var(--muted)}
.nav-links a.active,.nav-links a:hover{color:var(--text)}
.theme-toggle{border:1px solid var(--border);background:transparent;color:var(--text);border-radius:999px;padding:6px 12px;cursor:pointer}
.hero{padding:56px 0 28px}
.eyebrow{text-transform:uppercase;letter-spacing:.18em;font-size:.75rem;color:var(--accent);font-weight:700}
h1{font-size:clamp(2rem,4vw,3.2rem);line-height:1.1;margin:.4em 0}
.lede{font-size:1.15rem;color:var(--muted);max-width:70ch}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:18px;margin:28px 0 60px}
.card{
  background:var(--card);border:1px solid var(--border);border-radius:16px;
  padding:22px;display:flex;flex-direction:column;gap:10px;
  transition:transform .15s ease, border-color .15s ease;
}
.card:hover{transform:translateY(-3px);border-color:var(--accent)}
.card h2{margin:.2em 0;font-size:1.3rem}
.card p{color:var(--muted);margin:.2em 0}
.card .meta{font-size:.8rem;color:var(--muted)}
.btn{
  display:inline-block;margin-top:auto;text-decoration:none;
  background:linear-gradient(90deg,var(--accent),var(--accent2));
  color:#fff;padding:10px 16px;border-radius:10px;font-weight:700;width:fit-content;
}
.page-hero{padding:36px 0 10px}
.breadcrumb{font-size:.85rem;color:var(--muted);margin:18px 0 0}
.detail-layout{display:grid;grid-template-columns:280px 1fr;gap:24px;margin:20px 0 70px}
@media(max-width:860px){.detail-layout{grid-template-columns:1fr}}
.page-nav{position:sticky;top:76px;align-self:start;background:var(--card);border:1px solid var(--border);border-radius:14px;padding:16px}
.page-nav h3{margin-top:0;font-size:.9rem;text-transform:uppercase;letter-spacing:.12em;color:var(--muted)}
.page-nav a{display:block;padding:6px 0;color:var(--muted);text-decoration:none;font-size:.95rem}
.page-nav a:hover,.page-nav a.active{color:var(--text)}
.service-detail{background:var(--card);border:1px solid var(--border);border-radius:16px;padding:26px;margin-bottom:18px}
.service-detail h2{margin-top:0}
.service-detail p{color:var(--text);opacity:.92}
.callout{border-left:4px solid var(--accent);background:color-mix(in srgb,var(--accent) 10%,transparent);padding:12px 16px;border-radius:0 12px 12px 0;margin:16px 0}
footer{border-top:1px solid var(--border);padding:24px 0;color:var(--muted);font-size:.9rem}
.skip-link{position:absolute;left:-9999px}
.skip-link:focus{left:10px;top:10px;background:#fff;color:#000;padding:8px}
.section-number{font-size:.8rem;color:var(--accent);font-weight:800;letter-spacing:.14em}
.search{width:100%;padding:12px 14px;border-radius:12px;border:1px solid var(--border);background:var(--card);color:var(--text);margin:18px 0}
.toc-list{margin:0;padding-left:18px;color:var(--muted)}
kbd{border:1px solid var(--border);border-radius:6px;padding:0 6px;font-size:.85em}