:root { --fg:#0f172a; --muted:#475569; --bg:#f8fafc; --card:#ffffff; --border:#e2e8f0; --accent:#2563eb; }
* { box-sizing: border-box; }
html, body { height: 100%; }
body { margin: 0; font: 16px/1.5 system-ui, -apple-system, Segoe UI, Roboto, sans-serif; color: var(--fg); background: var(--bg); }

.container { max-width: 900px; margin: 2rem auto; padding: 0 1rem; }
.site-header, .site-footer { background: #fff; border-bottom: 1px solid var(--border); }
.site-footer { border-top: 1px solid var(--border); border-bottom: none; padding: .75rem 1rem; text-align: center; }
.nav { max-width: 900px; margin: 0 auto; padding: .75rem 1rem; display: flex; gap: 1rem; }
.nav a { color: var(--fg); text-decoration: none; padding: .25rem .5rem; border-radius: .5rem; }
.nav a:hover { background: var(--border); }

.card { background: var(--card); border: 1px solid var(--border); border-radius: 1rem; padding: 1.25rem; box-shadow: 0 1px 2px rgba(0,0,0,.03); }
.grid { display: grid; grid-template-columns: 1fr; gap: 1rem; margin-top: 1rem; }
.panel { border: 1px dashed var(--border); border-radius: .75rem; padding: 1rem; }

@media (min-width: 800px) {
    .grid { grid-template-columns: 1fr 1fr; }
}

.btn { appearance: none; border: 1px solid var(--border); border-radius: .5rem; padding: .5rem .75rem; background: #fff; cursor: pointer; }
.btn:hover { border-color: var(--accent); }
.muted { color: var(--muted); }
code { background: #f1f5f9; padding: .1rem .3rem; border-radius: .35rem; }

.geo-box { min-height: 120px; border: 1px solid var(--border); border-radius: .5rem; padding: .75rem; background: #fdfdfd; }
.alert { padding: .75rem; background: #fff7ed; border: 1px solid #fed7aa; border-radius: .5rem; }