:root{
  --bg:#ffffff; --fg:#0b1320; --muted:#5a6a85; --accent:#3b82f6; --accent2:#22c55e;
  --card:#f7fafc; --line:#e6ecf5; --shadow:0 10px 30px rgba(11,19,32,.08)
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,Arial;background:var(--bg);color:var(--fg);line-height:1.75}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
.container{max-width:1180px;margin:0 auto;padding:20px}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:20px}
.card{background:var(--card);border:1px solid var(--line);border-radius:18px;padding:20px;box-shadow:var(--shadow)}
h1,h2,h3{line-height:1.25}
.kicker{color:var(--muted);font-weight:800;font-size:12px;text-transform:uppercase;letter-spacing:.14em}
.btn{display:inline-block;background:linear-gradient(90deg,var(--accent),var(--accent2));color:#fff;padding:12px 16px;border-radius:12px;font-weight:800}
.btn.secondary{background:#fff;color:var(--fg);border:1px solid var(--line)}
.badge{display:inline-block;border:1px solid var(--line);color:#334155;padding:3px 10px;border-radius:999px;font-size:12px;background:#fff}
nav{position:sticky;top:0;background:rgba(255,255,255,.92);backdrop-filter:blur(10px);border-bottom:1px solid var(--line);z-index:60}
.nav-inner{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:10px 0}
.logo{font-weight:900;letter-spacing:.3px}
.menu{display:flex;gap:12px;align-items:center}
.menu a{padding:8px 12px;border-radius:10px}
.menu a:hover{background:#f1f5fb;text-decoration:none}
.hamburger{display:none;background:none;border:0;font-size:26px;line-height:1;padding:8px;color:#0b1320}
.nav-overlay{position:fixed;inset:0;background:rgba(11,19,32,.86);display:none;z-index:100;align-items:center;justify-content:center}
.nav-overlay.active{display:flex;animation:fadeIn .15s ease-out}
.nav-overlay .nav-sheet{display:flex;flex-direction:column;gap:16px;text-align:center}
.nav-overlay a{color:#fff;font-size:22px;padding:10px 16px;border-radius:12px;border:1px solid rgba(255,255,255,.18);background:rgba(255,255,255,.06)}
.nav-overlay a:hover{background:rgba(255,255,255,.12)}
@keyframes fadeIn{from{opacity:0;transform:scale(0.98)}to{opacity:1;transform:scale(1)}}
input[type="search"], input[type="number"], input[type="text"], textarea, select{width:100%;padding:10px 12px;border:1px solid var(--line);background:#fff;color:#0b1320;border-radius:12px}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.tool-actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:10px}
.table{width:100%;border-collapse:separate;border-spacing:0 8px}
.table tr{background:#fff;box-shadow:var(--shadow)}
.table td,.table th{padding:12px 16px}
code,kbd{background:#f1f5fb;border:1px solid var(--line);border-radius:6px;padding:2px 6px;color:#0b1320}
footer{border-top:1px solid var(--line);margin-top:48px}
ul.checks{list-style:none;padding:0;margin:.5rem 0}
ul.checks li{padding-left:24px;position:relative;margin:6px 0}
ul.checks li::before{content:"✔";position:absolute;left:0;top:0;color:var(--accent2)}
blockquote{border-left:4px solid var(--accent2);padding-left:12px;margin:14px 0;color:#0b1320;background:#f0fff4}
hr{border:0;border-top:1px solid var(--line);margin:24px 0}
.cat-tabs{display:flex;gap:8px;flex-wrap:wrap;margin:10px 0 14px}
.cat-tabs a{border:1px solid var(--line);border-radius:999px;padding:6px 10px;color:#0b1320;background:#fff}
.cat-tabs a.active{background:linear-gradient(90deg,var(--accent),var(--accent2));color:#fff;border-color:transparent}
@media (max-width: 940px){
  .grid{grid-template-columns:1fr}
  .form-row{grid-template-columns:1fr}
  .menu{display:none}
  .hamburger{display:block}
}