:root {
  color-scheme: light dark;

  --maxw: 640px;
  --pad: 24px;

  --bg: Canvas;
  --fg: CanvasText;
  --muted: color-mix(in oklab, CanvasText 70%, Canvas 30%);
  --border: color-mix(in oklab, CanvasText 15%, Canvas 85%);
  --card: color-mix(in oklab, Canvas 92%, CanvasText 8%);
  --focus: color-mix(in oklab, CanvasText 35%, Canvas 65%);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.45;
}

main {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: clamp(28px, 5vw, 64px) var(--pad);
}

h1 {
  margin: 0;
  font-size: clamp(44px, 7vw, 72px);
  letter-spacing: -0.03em;
  line-height: 1.05;
}

#dayline {
  margin: 12px 0 28px 0;
  color: var(--muted);
  font-size: 16px;
}

.card {
  border: 1px solid var(--border);
  background: var(--card);
  border-radius: 14px;
  padding: 18px;
}

label {
  display: block;
  margin: 0 0 10px 0;
  font-size: 14px;
  color: var(--muted);
}

input {
  width: 100%;
  padding: 12px 12px;
  font-size: 18px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--fg);
  outline: none;
}

input:focus {
  border-color: var(--focus);
  box-shadow: 0 0 0 4px color-mix(in oklab, var(--focus) 30%, transparent);
}

.status {
  margin: 10px 0 0 0;
  font-size: 14px;
  color: color-mix(in oklab, CanvasText 85%, Canvas 15%);
}

.result {
  margin: 14px 0 0 0;
  font-size: 22px;
  font-weight: 650;
  letter-spacing: -0.01em;
}

.footer {
  margin-top: 56px; /* pushes the random generator down */
  padding-top: 22px;
  border-top: 1px solid var(--border);
}

#msg {
  margin: 0 0 12px 0;
  color: var(--muted);
}

button {
  appearance: none;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--fg);
  padding: 10px 14px;
  border-radius: 10px;
  font-size: 15px;
  cursor: pointer;
}

button:hover {
  border-color: var(--focus);
}

button:active {
  transform: translateY(1px);
}