:root {
  --bg: #0f1218; --card: #171b24; --tile: #1e2430; --line: #2a3140;
  --text: #e6e9ef; --muted: #8b93a5; --ok: #2ecc71; --warn: #f1c40f; --bad: #e74c3c;
  --primary: #3b82f6;
}
* { box-sizing: border-box; }
html, body { margin: 0; background: var(--bg); color: var(--text); font: 15px/1.45 system-ui, -apple-system, Segoe UI, Roboto, sans-serif; }
body { min-height: 100vh; display: flex; align-items: flex-start; justify-content: center; padding: 24px 16px; }
.card { width: 100%; max-width: 560px; background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 20px; }
.card.center { text-align: center; margin-top: 12vh; }
header { display: flex; align-items: flex-start; justify-content: space-between; gap: 12px; margin-bottom: 14px; }
h1 { font-size: 20px; margin: 0 0 2px; }
.muted { color: var(--muted); margin: 0; font-size: 13px; }
.tiles { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; margin: 14px 0; }
.tile { background: var(--tile); border: 1px solid var(--line); border-radius: 10px; padding: 12px; display: flex; flex-direction: column; gap: 4px; }
.label { color: var(--muted); font-size: 12px; text-transform: uppercase; letter-spacing: .04em; }
.value { font-weight: 600; font-size: 16px; }
.value.ok { color: var(--ok); } .value.warn { color: var(--warn); } .value.bad { color: var(--bad); } .value.muted { color: var(--muted); font-weight: 500; }
.actions { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; margin: 12px 0; }
.btn { appearance: none; border: 1px solid var(--line); background: var(--tile); color: var(--text); padding: 10px 14px; border-radius: 9px; font: inherit; cursor: pointer; text-decoration: none; display: inline-block; }
.btn:disabled { opacity: .4; cursor: not-allowed; }
.btn.small { padding: 6px 10px; font-size: 13px; }
.btn.primary { background: var(--primary); border-color: var(--primary); color: #fff; }
.btn.success { background: #1f7a4a; border-color: #1f7a4a; color: #fff; }
.btn.danger { background: #8f2d2d; border-color: #8f2d2d; color: #fff; }
select { background: var(--tile); color: var(--text); border: 1px solid var(--line); border-radius: 9px; padding: 8px 10px; font: inherit; }
.banner { border-radius: 9px; padding: 10px 12px; margin: 4px 0 10px; border: 1px solid var(--line); background: var(--tile); }
.banner.ok { border-color: var(--ok); } .banner.warn { border-color: var(--warn); } .banner.err { border-color: var(--bad); }
.foot { margin-top: 8px; }
@media (max-width: 420px) { .tiles { grid-template-columns: 1fr; } }