:root {
  color-scheme: light dark;
  --bg: #f9fafb;
  --fg: #1a1a1a;
  --card-bg: #ffffff;
  --border: #e5e7eb;
  --accent: #2563eb;
  --muted: #6b7280;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121212;
    --fg: #f3f4f6;
    --card-bg: #1e1e1e;
    --border: #333;
    --muted: #9ca3af;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: system-ui, sans-serif;
}

.screen {
  max-width: 640px;
  margin: 0 auto;
  padding: 24px 16px;
}

header .subtitle {
  color: var(--muted);
  margin-top: -8px;
}

.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px;
  margin-bottom: 20px;
}

.card label {
  display: block;
  margin-top: 12px;
  font-weight: 600;
  font-size: 14px;
}

.card input {
  width: 100%;
  padding: 8px;
  margin-top: 4px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  color: var(--fg);
  font-size: 14px;
}

button {
  margin-top: 16px;
  padding: 10px 18px;
  border: none;
  border-radius: 8px;
  background: var(--accent);
  color: #fff;
  cursor: pointer;
  font-size: 14px;
}

button:disabled { opacity: 0.6; cursor: default; }

.hint { color: var(--muted); font-size: 13px; }
.error { color: #dc2626; font-size: 13px; }

table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 8px;
  font-size: 14px;
}

th, td {
  text-align: left;
  padding: 6px 4px;
  border-bottom: 1px solid var(--border);
}

button.link { background: none; border: none; color: #2740b8; text-decoration: underline; cursor: pointer; padding: 0; width: auto; }

a.button { display: inline-block; background: #2740b8; color: #fff; padding: 8px 14px; border-radius: 6px; text-decoration: none; }