:root{
  --bg:#0b0f19;
  --surface:#ffffff;
  --text:#0f172a;
  --muted:#475569;
  --brand:#2563eb;
  --brand-700:#1d4ed8;
  --accent:#f97316;
  --border:#e2e8f0;
  --shadow:0 10px 30px rgba(2,6,23,.08);
}
@media (prefers-color-scheme:dark){
  :root{--surface:#0b1220;--text:#e6e8ee;--muted:#9aa4b2;--border:#1f2937;--shadow:0 12px 30px rgba(0,0,0,.4)}
}
*{box-sizing:border-box}
html,body{margin:0;padding:0;font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,Ubuntu,Cantarell,Noto Sans,sans-serif;line-height:1.6;background:var(--surface);color:var(--text)}
img{max-width:100%;height:auto}
a{color:inherit;text-decoration:none}
a:hover{text-decoration:underline}
.small{font-size:.9rem}.muted{color:var(--muted)}
.container{max-width:1200px;margin:0 auto;padding:0 20px}
.row{display:flex;gap:16px}.space-between{justify-content:space-between}.align-center{align-items:center}
.grid-2{display:grid;grid-template-columns:1fr;gap:24px}
.grid-3{display:grid;grid-template-columns:1fr;gap:16px}
.grid-4{display:grid;grid-template-columns:1fr;gap:16px}
@media(min-width:900px){.grid-2{grid-template-columns:1.1fr .9fr}.grid-3{grid-template-columns:1fr 1fr 1fr}.grid-4{grid-template-columns:1fr 1fr 1fr 1fr}}
.btn{display:inline-block;padding:12px 18px;border-radius:14px;border:1px solid var(--border);box-shadow:var(--shadow);background:#fff;transition:.2s all}
.btn:hover{transform:translateY(-1px)}
.btn-primary{background:var(--brand);border-color:var(--brand);color:#fff}
.btn-primary:hover{background:var(--brand-700)}
.btn-ghost{background:transparent;border-color:var(--border)}
.badge{display:inline-block;padding:4px 10px;border-radius:999px;background:#dbeafe;color:#1e40af;font-weight:600}
.card{background:var(--surface);border:1px solid var(--border);border-radius:16px;box-shadow:var(--shadow);padding:20px}
.hero{padding:72px 0;background:linear-gradient(180deg,#f8fafc,transparent)}
.hero h1{font-size:2.25rem;line-height:1.2;margin:0}
.lead{font-size:1.15rem}
.strip{border-top:1px solid var(--border);border-bottom:1px solid var(--border);padding:14px 0;background:#fff}
.section{padding:64px 0}
.page-hero{padding:56px 0;background:linear-gradient(180deg,#eff6ff,transparent);border-bottom:1px solid var(--border)}
.prose{max-width:82ch;margin:24px auto}
ul.clean{list-style:none;padding:0;margin:0}
/* header */
.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.86);backdrop-filter:saturate(160%) blur(10px);border-bottom:1px solid var(--border)}
.brand{display:flex;align-items:center;gap:10px;font-weight:800}
.logo{width:32px;height:32px}.logo-sm{width:22px;height:22px}
.nav{display:none;position:absolute;top:56px;right:20px;background:var(--surface);border:1px solid var(--border);border-radius:14px;box-shadow:var(--shadow);padding:12px;flex-direction:column;gap:8px}
.nav a{padding:8px 10px;border-radius:10px}
.nav a:hover{background:#f3f4f6;text-decoration:none}
.nav-toggle{display:none}
.hamburger{display:flex;flex-direction:column;gap:4px;padding:10px 8px;border:1px solid var(--border);border-radius:10px;cursor:pointer}
.hamburger span{display:block;width:20px;height:2px;background:#111827}
@media(min-width:900px){.nav{display:flex;position:static;flex-direction:row;gap:16px;border:none;box-shadow:none;padding:0}.hamburger{display:none}}
.nav-toggle:checked ~ .hamburger + .nav{display:flex}
/* footer */
.site-footer{margin-top:48px;background:#0b0f19;color:#d1d5db;padding-top:36px;border-top:1px solid #111827}
.site-footer a{color:#d1d5db}
.subfooter{text-align:center;border-top:1px solid rgba(255,255,255,.08);padding:12px 0;margin-top:20px;font-size:.9rem}
/* forms */
.lbl{display:block;font-size:.95rem;margin:8px 0 4px}
.inp{width:100%;padding:12px;border:1px solid var(--border);border-radius:12px;background:#fff}
.mt{margin-top:10px}
/* tables */
table{width:100%;border-collapse:collapse}
th,td{border:1px solid var(--border);padding:10px;border-radius:0}
th{background:#f3f4f6;text-align:left}
/* accessibility */
.skip-link{position:absolute;left:-9999px;top:auto}
.skip-link:focus{left:10px;top:10px;background:#111827;color:#fff;padding:8px;border-radius:8px}