:root {
  color-scheme: light dark;
  --bg: #0f172a;
  --card: #111827;
  --text: #e5e7eb;
  --accent: #22d3ee;
  --muted: #93c5fd;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Inter, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
  background: radial-gradient(circle at top, #1e293b, var(--bg));
  color: var(--text);
  min-height: 100vh;
}

.container {
  width: min(860px, 92vw);
  margin: 2rem auto;
  display: grid;
  gap: 1rem;
}

.card {
  background: color-mix(in srgb, var(--card) 90%, black 10%);
  border: 1px solid #334155;
  border-radius: 0.75rem;
  padding: 1rem 1.25rem;
}

h1,
h2 {
  margin: 0 0 0.5rem;
}

.controls {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

button {
  appearance: none;
  border: none;
  border-radius: 0.6rem;
  padding: 0.7rem 1rem;
  font-size: 1rem;
  font-weight: 600;
  color: #0b1020;
  background: linear-gradient(120deg, #67e8f9, var(--accent));
  width: fit-content;
  cursor: pointer;
}

button:hover {
  filter: brightness(1.1);
}

.hint {
  margin: 0;
  color: var(--muted);
}

dl {
  margin: 0;
  display: grid;
  gap: 0.75rem;
}

dl div {
  display: grid;
  grid-template-columns: 90px 1fr;
}

dt {
  font-weight: 600;
}

dd {
  margin: 0;
}

ul {
  margin: 0;
  padding-left: 1.2rem;
}

li + li {
  margin-top: 0.35rem;
}