:root{
  --bg: #ffffff;
  --panel: #ffffff;
  --text: #111827;
  --muted: #6b7280;
  --border: #e5e7eb;
  --shadow: 0 10px 30px rgba(17,24,39,.08);
  --brand: #2563eb;
  --brand-soft: rgba(37,99,235,.10);
  --radius: 16px;
}
*{ box-sizing: border-box; }
body{
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial;
  color: var(--text);
  background: linear-gradient(180deg, #f8fafc, #ffffff 40%);
}
.container{ max-width: 1040px; margin: 0 auto; padding: 0 18px; }
.site-header{
  position: sticky; top: 0;
  background: rgba(255,255,255,.88);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.site-header .container{
  display:flex; align-items:center; justify-content:space-between;
  min-height: 64px; gap: 14px;
}
.brand__title{ font-weight: 700; letter-spacing: .2px; }
.brand__sub{ font-size: 12px; color: var(--muted); margin-top: 2px; }
.nav{ display:flex; gap:10px; flex-wrap:wrap; }
.nav a{
  text-decoration:none; color: var(--text);
  padding: 8px 10px; border-radius: 10px;
  border: 1px solid transparent;
}
.nav a:hover{ border-color: var(--border); background: #fff; }
.hero{ padding: 28px 0 10px; }
.hero h1{ margin: 0 0 6px; font-size: 28px; }
.hero p{ margin: 0; color: var(--muted); max-width: 70ch; }
.grid{
  display:grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px; padding: 16px 0 28px;
}
@media (max-width: 900px){ .grid{ grid-template-columns: 1fr; } }
.card{
  display:block; text-decoration:none; color: inherit;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  box-shadow: var(--shadow);
}
.card:hover{
  border-color: rgba(37,99,235,.35);
  box-shadow: 0 16px 40px rgba(17,24,39,.10);
}
.card h2{ margin: 0 0 6px; font-size: 18px; }
.card p{ margin: 0; color: var(--muted); }
.page-title{ padding: 22px 0 10px; }
.breadcrumbs{ font-size: 12px; color: var(--muted); }
.breadcrumbs a{ color: var(--brand); text-decoration:none; }
.breadcrumbs a:hover{ text-decoration: underline; }
.list{
  background:#fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px;
  box-shadow: var(--shadow);
}
.site-footer{
  border-top: 1px solid var(--border);
  padding: 18px 0;
  color: var(--muted);
  font-size: 12px;
}
code{
  background: var(--brand-soft);
  padding: 2px 6px;
  border-radius: 8px;
  border: 1px solid rgba(37,99,235,.18);
}
.muted{ color: var(--muted); }