:root{
  --bg:#f6f8fc;
  --surface:#ffffff;
  --text:#17191f;
  --muted:#697080;
  --line:#e6e9f0;
  --brand:#3178d4;
  --brand-soft:#eaf2fd;
  --shadow:0 18px 55px rgba(27,45,82,.10);
  --radius:24px;
  --max:960px;
}
@media (prefers-color-scheme:dark){
  :root{
    --bg:#0f1116;
    --surface:#171a21;
    --text:#f5f7fb;
    --muted:#a7adba;
    --line:#2a2f3a;
    --brand:#72aef1;
    --brand-soft:#17263a;
    --shadow:0 18px 55px rgba(0,0,0,.32);
  }
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  background:
    radial-gradient(circle at top right, rgba(49,120,212,.12), transparent 35%),
    var(--bg);
  color:var(--text);
  font-family:-apple-system,BlinkMacSystemFont,"SF Pro Display","Segoe UI",sans-serif;
  line-height:1.65;
}
a{color:var(--brand);text-decoration:none}
a:hover{text-decoration:underline}
.shell{width:min(var(--max),calc(100% - 36px));margin:0 auto}
header{
  position:sticky;top:0;z-index:10;
  backdrop-filter:saturate(180%) blur(18px);
  background:color-mix(in srgb,var(--bg) 82%,transparent);
  border-bottom:1px solid color-mix(in srgb,var(--line) 78%,transparent);
}
.nav{
  min-height:72px;display:flex;align-items:center;justify-content:space-between;gap:20px;
}
.brand{display:flex;align-items:center;gap:12px;font-weight:800;font-size:1.15rem;color:var(--text)}
.mark{
  width:38px;height:38px;border-radius:12px;background:var(--brand);
  display:grid;place-items:center;box-shadow:0 8px 22px rgba(49,120,212,.28)
}
.mark svg{width:24px;height:24px}
.links{display:flex;gap:18px;flex-wrap:wrap}
.links a{color:var(--muted);font-weight:650;font-size:.95rem}
.hero{padding:82px 0 34px}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;padding:7px 12px;border-radius:999px;
  background:var(--brand-soft);color:var(--brand);font-weight:750;font-size:.85rem
}
h1{font-size:clamp(2.5rem,8vw,5rem);line-height:.98;letter-spacing:-.055em;margin:22px 0 18px}
.lead{max-width:700px;color:var(--muted);font-size:1.15rem;margin:0}
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;padding:34px 0 80px}
.card{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
  padding:26px;box-shadow:var(--shadow)
}
.card h2{margin:0 0 8px;font-size:1.25rem}
.card p{margin:0 0 18px;color:var(--muted)}
.page{padding:60px 0 84px}
.article{
  background:var(--surface);border:1px solid var(--line);border-radius:30px;
  padding:clamp(26px,5vw,58px);box-shadow:var(--shadow)
}
.article h1{font-size:clamp(2.4rem,7vw,4.5rem);margin-top:0}
.article h2{margin-top:42px;font-size:1.35rem;letter-spacing:-.02em}
.article p,.article li{color:var(--text)}
.article .muted{color:var(--muted)}
.note{
  background:var(--brand-soft);border-radius:18px;padding:18px 20px;margin:26px 0;
  border:1px solid color-mix(in srgb,var(--brand) 20%,transparent)
}
.meta{color:var(--muted);font-size:.95rem}
footer{border-top:1px solid var(--line);padding:28px 0 42px;color:var(--muted);font-size:.92rem}
.footer-row{display:flex;justify-content:space-between;gap:18px;flex-wrap:wrap}
@media(max-width:760px){
  .links{gap:12px}.links a{font-size:.88rem}.grid{grid-template-columns:1fr}
  .hero{padding-top:56px}.nav{align-items:flex-start;padding:16px 0;flex-direction:column}
}