:root {
  --brand: #1f7aec;
  --bg: #0f172a;
  --text: #e2e8f0;
  --card: #111827;
  --ok: #10b981;
  --warn: #f59e0b;
  --err: #ef4444;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; background: var(--bg); color: var(--text); font-family: system-ui, -apple-system, Segoe UI, Roboto, sans-serif; }
a { color: var(--brand); text-decoration: none; }
.header, .nav { display: flex; align-items: center; justify-content: space-between; padding: 12px 16px; background: #0b1220; position: sticky; top: 0; z-index: 10; }
.container { max-width: 960px; margin: 0 auto; padding: 16px; }
.card { background: var(--card); border-radius: 10px; padding: 16px; box-shadow: 0 10px 25px rgba(0,0,0,.25); }
.grid { display: grid; gap: 16px; }
@media (min-width: 700px) { .grid-2 { grid-template-columns: repeat(2, 1fr); } .grid-4 { grid-template-columns: repeat(4, 1fr); } }
.btn { background: var(--brand); color: #fff; padding: 10px 14px; border-radius: 8px; border: none; cursor: pointer; }
.btn.secondary { background: #374151; }
.input { width: 100%; padding: 10px; border-radius: 8px; border: 1px solid #334155; background: #0f172a; color: var(--text); }
.label { font-size: 14px; margin-bottom: 6px; display: block; }
.form-row { margin-bottom: 12px; }
.alert { padding: 10px 14px; border-radius: 8px; margin-bottom: 12px; }
.alert.ok { background: #052b1f; color: #86efac; border: 1px solid #14532d; }
.alert.err { background: #2b0b0b; color: #fecaca; border: 1px solid #7f1d1d; }
.small { font-size: 12px; opacity: .8; }
.lang-switch { display: flex; gap: 8px; align-items: center; }
.footer { padding: 24px 16px; text-align: center; opacity: .7; }