:root {
  --bg: #f5f6f8; --card: #fff; --text: #1c2330; --muted: #6b7280; --line: #e3e6ec;
  --red: #e53935; --green: #2e9e5b; --blue: #1e6fd9; --yellow: #f5b400;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #12151b; --card: #1b1f27; --text: #e6e9ef; --muted: #9aa3b2; --line: #2a303b; }
}
* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; background: var(--bg); color: var(--text); font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; display: flex; justify-content: center; padding: env(safe-area-inset-top) 16px env(safe-area-inset-bottom); }
.panel { width: 100%; max-width: 420px; padding: 24px 0; }
header { display: flex; align-items: center; gap: 10px; margin-bottom: 20px; }
h1 { font-size: 1.4rem; margin: 0; flex: 1; }
.logo { display: inline-grid; grid-template-columns: 1fr 1fr; gap: 3px; width: 30px; height: 30px; }
.logo i { display: block; border-radius: 4px; }
.logo i:nth-child(1) { background: var(--red); }
.logo i:nth-child(2) { background: var(--green); }
.logo i:nth-child(3) { background: var(--blue); }
.logo i:nth-child(4) { background: var(--yellow); }
.red { font-size: .75rem; font-weight: 600; padding: 2px 10px; border-radius: 999px; }
.red.ok { background: rgba(46, 158, 91, .18); color: var(--green); }
.red.off { background: rgba(229, 57, 53, .16); color: var(--red); }

form { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 18px; }
label { display: block; font-weight: 600; font-size: .9rem; margin-bottom: 14px; }
input { display: block; width: 100%; margin-top: 4px; padding: 12px; font: inherit; font-size: 1.1rem; border: 1px solid var(--line); border-radius: 10px; background: var(--bg); color: var(--text); }
input:focus { outline: 2px solid var(--blue); outline-offset: 1px; }
.checar { width: 100%; padding: 16px; font: inherit; font-size: 1.2rem; font-weight: 700; color: #fff; background: var(--blue); border: 0; border-radius: 12px; cursor: pointer; }
.checar:disabled { opacity: .6; }

.resultado { margin-top: 16px; padding: 18px; border-radius: 14px; text-align: center; font-weight: 600; }
.resultado .grande { display: block; font-size: 1.5rem; margin-bottom: 4px; }
.resultado.ok { background: rgba(46, 158, 91, .18); border: 1px solid rgba(46, 158, 91, .5); }
.resultado.warn { background: rgba(245, 180, 0, .2); border: 1px solid rgba(245, 180, 0, .6); }
.resultado.err { background: rgba(229, 57, 53, .14); border: 1px solid rgba(229, 57, 53, .5); }
.aviso { margin-top: 12px; padding: 10px 14px; border-radius: 10px; font-size: .9rem; background: rgba(245, 180, 0, .2); border: 1px solid rgba(245, 180, 0, .6); }
.aviso.err { background: rgba(229, 57, 53, .14); border-color: rgba(229, 57, 53, .5); }
.aviso button { margin-top: 6px; font: inherit; font-size: .85rem; padding: 4px 10px; border-radius: 8px; border: 1px solid var(--line); background: var(--card); color: var(--text); }
.nota { color: var(--muted); font-size: .8rem; margin-top: 20px; }
[hidden] { display: none !important; }