:root {
  color-scheme: dark;
  --bg: #0d1117;
  --panel: #161b22;
  --line: #30363d;
  --text: #e6edf3;
  --muted: #8b949e;
  --ok: #3fb950;
  --bad: #f85149;
  --accent: #d2ff3a;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  min-height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  touch-action: none;
  user-select: none;
}

body {
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  max-width: 720px;
  margin: 0 auto;
}

header h1 {
  font-size: 20px;
  margin: 0 0 4px;
  letter-spacing: 0.5px;
}

.sub { color: var(--muted); font-size: 14px; }

.hidden { display: none !important; }

.grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 14px;
}

.card h2 {
  font-size: 12px;
  margin: 0 0 10px;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.8px;
}

.status .row {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  padding: 5px 0;
  border-bottom: 1px dashed var(--line);
  font-size: 14px;
}

.status .row:last-child { border-bottom: 0; }

b.ok { color: var(--ok); }
b.bad { color: var(--bad); }

button {
  appearance: none;
  border: 1px solid var(--line);
  background: var(--bg);
  color: var(--text);
  border-radius: 10px;
  padding: 12px 16px;
  font-size: 15px;
  font-weight: 600;
  margin: 4px 6px 4px 0;
}

button.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #111;
}

button:disabled { opacity: 0.5; }

input {
  flex: 1;
  min-width: 0;
  background: var(--bg);
  border: 1px solid var(--line);
  color: var(--text);
  border-radius: 10px;
  padding: 12px;
  font-size: 18px;
  letter-spacing: 3px;
  text-transform: uppercase;
}

.row2 { display: flex; gap: 8px; }

.hint { color: var(--muted); font-size: 12px; line-height: 1.5; margin: 8px 0 0; }

.warn {
  background: #3d1d1d;
  border: 1px solid var(--bad);
  color: #ffb3b3;
  padding: 10px 12px;
  border-radius: 10px;
  font-size: 13px;
}

.log {
  color: var(--muted);
  font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
  font-size: 11px;
  white-space: pre-wrap;
  min-height: 1em;
}

@media (max-width: 560px) {
  .grid { grid-template-columns: 1fr; }
  body { padding: 14px; }
}