:root {
  --primary: #22c55e;
  --bg: #ffffff;
  --fg: #0f172a;
  --muted: #64748b;
  --border: #e2e8f0;
  --card-bg: #f8fafc;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f172a;
    --fg: #e2e8f0;
    --muted: #94a3b8;
    --border: #1e293b;
    --card-bg: #1e293b;
  }
}

* { box-sizing: border-box; }
body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
       background: var(--bg); color: var(--fg); margin: 0;
       line-height: 1.5; }

.topbar { display: flex; align-items: center; justify-content: space-between;
          padding: 12px 24px; background: var(--bg); border-bottom: 1px solid var(--border); }
.brand a { color: var(--fg); text-decoration: none; }
.brand strong { color: var(--primary); }
.crumbs { color: var(--muted); font-size: 13px; }
.crumbs a { color: var(--primary); text-decoration: none; }
.crumbs a:hover { text-decoration: underline; }

main.index { max-width: 1100px; margin: 0 auto; padding: 24px; }
main.index .intro { color: var(--muted); margin: 8px 0 32px; max-width: 70ch; }
main.index .intro a { color: var(--primary); }
main.index .intro code { background: var(--card-bg); padding: 2px 6px;
                        border-radius: 4px; font-size: 12px; }

main.index h2 { margin: 32px 0 12px; font-size: 14px; text-transform: uppercase;
                letter-spacing: 0.1em; color: var(--muted); }

ul.cards { list-style: none; padding: 0; margin: 0;
           display: grid; gap: 10px;
           grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); }
ul.cards a { display: flex; flex-direction: column; gap: 4px;
             padding: 12px 14px; border: 1px solid var(--border);
             background: var(--card-bg); border-radius: 8px;
             text-decoration: none; color: var(--fg); transition: border-color .15s; }
ul.cards a:hover { border-color: var(--primary); }
.card-title { font-weight: 600; font-size: 14px; }
.card-key { font-size: 11px; color: var(--muted); }
.card-key code { font-size: 11px; }
.card-desc { font-size: 12px; color: var(--muted);
             overflow: hidden; display: -webkit-box;
             -webkit-line-clamp: 2; -webkit-box-orient: vertical; }
.card-stats { margin-top: 4px; font-size: 11px; color: var(--muted); }

.footer { padding: 24px; text-align: center; color: var(--muted); border-top: 1px solid var(--border); margin-top: 48px; }