:root { --fg: #1d1d1f; --muted: #6e6e73; --bg: #f5f5f7; --card: #fff; --accent: #0a7c6b; --warn: #b3261e; }
@media (prefers-color-scheme: dark) {
  :root { --fg: #f5f5f7; --muted: #a1a1a6; --bg: #111; --card: #1c1c1e; --accent: #3cc3ad; --warn: #ff8a80; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--fg); font: 16px/1.6 -apple-system, "Apple SD Gothic Neo", "Malgun Gothic", sans-serif; }
main { max-width: 560px; margin: 0 auto; padding: 16px; }
h1 { font-size: 1.4rem; }
.test-banner { background: #fff3cd; color: #5c4400; padding: 8px 12px; border-radius: 8px; font-size: .9rem; }
fieldset { background: var(--card); border: 0; border-radius: 12px; margin: 0 0 12px; padding: 14px 16px; }
legend { font-weight: 600; padding: 0; margin-bottom: 6px; float: left; width: 100%; }
label { display: block; padding: 6px 0; clear: both; }
input[type=number], input[inputmode] { width: 100%; padding: 10px; font-size: 1rem; border: 1px solid #ccc; border-radius: 8px; margin-top: 4px; }
.note { color: var(--muted); font-size: .9rem; clear: both; }
.error { color: var(--warn); }
button { width: 100%; padding: 14px; font-size: 1.05rem; border: 0; border-radius: 12px; background: var(--accent); color: #fff; }
button:disabled { opacity: .5; }