:root {
  --bg: #0a1220;
  --card: #121d2f;
  --card-2: #172742;
  --line: #2f476e;
  --text: #eff7ff;
  --muted: #b9cae1;
  --accent: #7ae1ff;
  --accent-2: #a8ffbf;
  --gold: #f5d28b;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, sans-serif;
  background: radial-gradient(circle at top, #173154 0, var(--bg) 60%);
  color: var(--text);
}
.shell {
  max-width: 1080px;
  margin: 0 auto;
  padding: 24px 16px 40px;
}
.card {
  background: linear-gradient(180deg, var(--card), var(--card-2));
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 20px;
  margin-bottom: 18px;
  box-shadow: 0 18px 44px rgba(0, 0, 0, 0.24);
}
.eyebrow {
  margin: 0 0 8px;
  letter-spacing: 0.16em;
  font-size: 0.76rem;
  color: var(--accent-2);
}
h1, h2 { margin-top: 0; }
.lead { color: var(--muted); max-width: 700px; }
.hud, .controls {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 12px;
}
.hud span {
  background: rgba(8, 14, 25, 0.75);
  border: 1px solid var(--line);
  padding: 8px 12px;
  border-radius: 999px;
}
button {
  border: none;
  border-radius: 12px;
  padding: 11px 16px;
  cursor: pointer;
  font-weight: 700;
  background: linear-gradient(180deg, var(--accent), var(--accent-2));
  color: #092033;
}
button.secondary {
  background: #243755;
  color: var(--text);
  border: 1px solid var(--line);
}
.large-button {
  font-size: 1.05rem;
  padding: 14px 22px;
}
.hidden {
  display: none;
}
.start-screen {
  text-align: center;
  padding: 34px 24px;
}
.start-actions {
  margin: 20px 0;
}
.mode-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 12px;
  margin: 20px 0;
}
.mode-button {
  min-height: 64px;
}
.start-list {
  list-style: none;
  padding: 0;
  margin: 22px auto 0;
  max-width: 420px;
  color: var(--muted);
}
.start-list li {
  margin: 10px 0;
}
canvas {
  width: 100%;
  height: auto;
  display: block;
  background: linear-gradient(180deg, #7fd2ff 0%, #8fe0ff 35%, #87d997 36%, #63ba7b 100%);
  border-radius: 16px;
  border: 1px solid rgba(255,255,255,0.15);
}
.info-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
ul { margin-bottom: 0; }
@media (max-width: 760px) {
  .info-grid { grid-template-columns: 1fr; }
}