:root {
  color-scheme: light dark;
  --bg: #0f172a;
  --card: #1e293b;
  --text: #f1f5f9;
  --accent: #38bdf8;
  --danger: #f87171;
  --muted: #334155;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
}

.card {
  width: min(90vw, 380px);
  background: var(--card);
  border-radius: 20px;
  padding: 2rem;
  text-align: center;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.35);
}

h1 {
  margin: 0 0 1.5rem;
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--accent);
}

.time {
  font-size: 3rem;
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  margin-bottom: 1.5rem;
  letter-spacing: 0.02em;
}

.buttons {
  display: flex;
  gap: 0.75rem;
  justify-content: center;
  margin-bottom: 1.5rem;
}

button {
  flex: 1;
  padding: 0.75rem 1rem;
  border: none;
  border-radius: 12px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  background: var(--muted);
  color: var(--text);
  transition: transform 0.1s ease, opacity 0.2s ease;
}

button:active {
  transform: scale(0.96);
}

button.primary {
  background: var(--accent);
  color: #0f172a;
}

button.primary.running {
  background: var(--danger);
  color: #0f172a;
}

button:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.laps {
  list-style: none;
  margin: 0;
  padding: 0;
  max-height: 180px;
  overflow-y: auto;
  text-align: left;
}

.laps li {
  display: flex;
  justify-content: space-between;
  padding: 0.5rem 0.25rem;
  border-bottom: 1px solid var(--muted);
  font-variant-numeric: tabular-nums;
  font-size: 0.9rem;
}

.laps li span:first-child {
  color: #94a3b8;
}