:root{
  --bg:#f6f7f9;
  --panel:#ffffff;
  --text:#0f172a;
  --muted:#475569;
  --line:rgba(15,23,42,.12);
  --accent:#2563eb;
  --accent-2:#0ea5e9;
  --shadow:0 10px 22px rgba(2,6,23,.06);
  --radius:14px;
  --max:1100px;
}

@media (prefers-color-scheme: dark){
  :root{
    --bg:#0b0f14;
    --panel:#0f1621;
    --text:#e7edf6;
    --muted:#a8b3c7;
    --line:rgba(231,237,246,.12);
    --accent:#6ea8ff;
    --accent-2:#9bf0d2;
    --shadow:0 10px 30px rgba(0,0,0,.35);
  }
}

*{box-sizing:border-box}
html{color-scheme:light dark;scroll-behavior:smooth}
body{
  margin:0;
  font-family:ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,"Apple Color Emoji","Segoe UI Emoji";
  background:var(--bg);
  color:var(--text);
  line-height:1.55;
}

a{color:var(--text)}
a:hover{color:var(--accent)}
a:focus-visible{outline:2px solid rgba(37,99,235,.55);outline-offset:2px;border-radius:10px}
img{max-width:100%;height:auto}

.container{max-width:var(--max);margin:0 auto;padding:0 18px}

.skip-link{
  position:absolute;left:-999px;top:10px;
  background:var(--panel);color:var(--text);
  padding:10px 12px;border:1px solid var(--line);border-radius:10px
}
.skip-link:focus{left:12px;z-index:999}

.header{
  position:sticky;top:0;z-index:50;
  backdrop-filter:saturate(140%) blur(10px);
  background:rgba(246,247,249,.80);
  border-bottom:1px solid var(--line)
}

@media (prefers-color-scheme: dark){
  .header{background:rgba(11,15,20,.70)}
}

.header-inner{display:flex;align-items:center;justify-content:space-between;padding:14px 0;gap:16px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none}
.logo{
  width:30px;height:30px;border-radius:10px;
  background-color:var(--panel);
  background-image:url('/icon.webp');
  background-repeat:no-repeat;
  background-position:center;
  background-size:cover;
  border:1px solid var(--line);
  box-shadow:0 8px 20px rgba(2,6,23,.10)
}
.brand span{font-weight:650;letter-spacing:.2px}

.nav{display:flex;align-items:center;gap:14px}
.nav a{
  text-decoration:none;
  color:var(--muted);
  padding:8px 10px;
  border-radius:10px
}
.nav a[aria-current="page"],
.nav a:hover{color:var(--text);background:rgba(15,23,42,.05)}

@media (prefers-color-scheme: dark){
  .nav a[aria-current="page"],
  .nav a:hover{background:rgba(231,237,246,.06)}
}

.menu-btn{
  display:inline-flex;align-items:center;justify-content:center;
  width:42px;height:40px;border-radius:12px;
  border:1px solid var(--line);
  background:rgba(15,23,42,.03);
  color:var(--text);
}
.menu-btn:focus{outline:2px solid rgba(37,99,235,.55);outline-offset:2px}

@media (prefers-color-scheme: dark){
  .menu-btn{background:rgba(231,237,246,.04)}
  .menu-btn:focus{outline:2px solid rgba(110,168,255,.5)}
}

@media (min-width: 860px){
  .menu-btn{display:none}
}

@media (max-width: 859px){
  .nav{
    position:absolute;left:0;right:0;top:64px;
    display:none;flex-direction:column;align-items:stretch;
    background:rgba(246,247,249,.96);
    border-bottom:1px solid var(--line)
  }
  .nav.open{display:flex}
  .nav a{padding:12px 18px;border-radius:0}
}

@media (max-width: 859px) and (prefers-color-scheme: dark){
  .nav{background:rgba(11,15,20,.92)}
}

.hero{padding:58px 0 22px}
.kicker{color:var(--muted);font-size:14px;letter-spacing:.18em;text-transform:uppercase;margin:0 0 10px}
.h1{font-size:34px;line-height:1.12;margin:0 0 12px;letter-spacing:-.02em}
.lede{color:var(--muted);font-size:17px;max-width:62ch;margin:0 0 18px}

@media (min-width: 860px){
  .hero{padding:78px 0 30px}
  .h1{font-size:46px}
}

.actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:18px}
.cta-actions{margin-top:0}
@media (min-width: 860px){
  .cta-actions{justify-content:flex-end}
}
.btn{
  display:inline-flex;align-items:center;justify-content:center;
  padding:11px 14px;border-radius:12px;
  border:1px solid var(--line);
  text-decoration:none;color:var(--text);
  background:rgba(15,23,42,.03)
}
.btn.primary{
  border-color:rgba(37,99,235,.38);
  background:linear-gradient(135deg, rgba(37,99,235,.12), rgba(14,165,233,.10));
}
.btn:hover{transform:translateY(-1px)}
.btn:focus-visible{outline:2px solid rgba(37,99,235,.55);outline-offset:2px}

@media (prefers-color-scheme: dark){
  .btn{background:rgba(231,237,246,.04)}
  .btn.primary{
    border-color:rgba(110,168,255,.45);
    background:linear-gradient(135deg, rgba(110,168,255,.22), rgba(155,240,210,.12));
  }
  .btn:focus-visible{outline:2px solid rgba(110,168,255,.5)}
}

.grid{display:grid;gap:14px;margin:22px 0 36px}
@media (min-width: 860px){.grid{grid-template-columns:repeat(3, 1fr);gap:16px}}

.card{
  background:var(--panel);
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:16px;
  box-shadow:var(--shadow)
}
.card h2{margin:0 0 8px;font-size:16px;letter-spacing:-.01em}
.card p{margin:0;color:var(--muted)}

.section{padding:28px 0}
.section h2{font-size:20px;margin:0 0 12px}
.section p{margin:0 0 12px;color:var(--muted);max-width:72ch}
.section ul{margin:10px 0 0 18px;color:var(--muted)}
.section li{margin:6px 0}

.split{display:grid;gap:14px;align-items:start}
@media (min-width: 860px){.split{grid-template-columns:1.2fr .8fr;gap:16px}}

.badge{
  display:inline-flex;gap:8px;align-items:center;
  border:1px solid var(--line);
  background:rgba(15,23,42,.03);
  border-radius:999px;
  padding:8px 10px;
  color:var(--muted);
  font-size:13px
}

@media (prefers-color-scheme: dark){
  .badge{background:rgba(231,237,246,.04)}
}

.footer{border-top:1px solid var(--line);padding:26px 0 40px;color:var(--muted)}
.footer a{color:var(--muted);text-decoration:none}
.footer a:hover{color:var(--text)}
.footer-inner{display:flex;flex-direction:column;gap:10px}
.footer-links{display:flex;flex-wrap:wrap;gap:12px}

.small{font-size:13px;color:var(--muted)}
.hr{height:1px;background:var(--line);margin:18px 0}

.prose h1{font-size:28px;margin:0 0 10px}
.prose h2{font-size:18px;margin:18px 0 8px}
.prose p{margin:0 0 12px;color:var(--muted)}
.prose a{color:var(--text);text-decoration-thickness:1px;text-underline-offset:3px}
.prose a:hover{color:var(--accent)}
.prose .meta{margin-top:6px}

.notice{
  border-left:3px solid rgba(37,99,235,.55);
  padding:10px 12px;
  background:rgba(37,99,235,.07);
  border-radius:12px;
  color:var(--muted)
}

@media (prefers-color-scheme: dark){
  .notice{
    border-left-color:rgba(110,168,255,.55);
    background:rgba(110,168,255,.08);
  }
}