:root{
  --brand:#0B4FB0; --brand2:#1E6FE0; --ink:#16202c; --muted:#5b6b7b;
  --bg:#f5f8fd; --card:#ffffff; --line:#e6edf6; --accent:#f59e0b;
}
*{box-sizing:border-box}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Arial,sans-serif;
  margin:0;background:var(--bg);color:var(--ink);line-height:1.7;
}
.wrap{max-width:820px;margin:0 auto;padding:0 20px}
header.site{
  background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;
  padding:22px 0;box-shadow:0 6px 20px rgba(11,79,176,.25)
}
header.site .wrap{display:flex;align-items:center;gap:14px;flex-wrap:wrap}
.logo{width:44px;height:44px;border-radius:12px;background:rgba(255,255,255,.18);
  display:grid;place-items:center;font-size:24px;flex:0 0 auto}
header.site b{font-size:1.15rem;display:block}
header.site small{opacity:.85}
nav.tabs{background:var(--card);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:5}
nav.tabs .wrap{display:flex;gap:6px;overflow-x:auto;padding:10px 20px}
nav.tabs a{
  white-space:nowrap;text-decoration:none;color:var(--muted);font-weight:600;
  padding:8px 14px;border-radius:999px;font-size:.92rem
}
nav.tabs a.active,nav.tabs a:hover{background:#eaf2ff;color:var(--brand)}
main{padding:28px 0 10px}
.card{background:var(--card);border:1px solid var(--line);border-radius:18px;
  padding:24px 26px;box-shadow:0 2px 10px rgba(20,40,70,.04);margin-bottom:18px}
h1{color:var(--brand);margin:.2em 0 .1em;font-size:1.7rem}
h2{color:var(--brand2);margin-top:1.6em;font-size:1.2rem}
h3{margin:1.1em 0 .2em;font-size:1.02rem}
a{color:var(--brand2)}
.muted{color:var(--muted);font-size:.9em}
.note{background:#fff8ec;border:1px solid #f6e2b8;border-radius:12px;padding:14px 16px;margin:16px 0}
.grid{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:16px 0}
.grid .item{background:#f7faff;border:1px solid var(--line);border-radius:12px;padding:14px 16px}
.grid .item b{color:var(--brand)}
footer.site{color:var(--muted);font-size:.88rem;text-align:center;padding:26px 20px 40px}
@media(max-width:560px){.grid{grid-template-columns:1fr}h1{font-size:1.45rem}}