:root {
  --ink: #111a2f;
  --line: rgba(17, 26, 47, 0.2);
  --panel: rgba(255, 255, 255, 0.9);
  --accent: #5d5fef;
  --accent2: #ff6b8a;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Manrope", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at 82% 14%, rgba(93, 95, 239, 0.26), transparent 34%),
    radial-gradient(circle at 12% 22%, rgba(255, 107, 138, 0.22), transparent 34%),
    linear-gradient(138deg, #eef2ff, #fff2fa 46%, #f9fff2);
}

.shell {
  width: min(1240px, 94vw);
  margin: 0 auto;
  padding: 2rem 0 2.4rem;
}

.kicker {
  margin: 0;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  font-size: 0.82rem;
  color: #4f548d;
}

header h1 {
  margin: 0.2rem 0 0;
  font-size: clamp(2rem, 5vw, 3.1rem);
}

.layout {
  margin-top: 1rem;
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 1rem;
}

.stage-wrap {
  border: 2px solid var(--line);
  border-radius: 18px;
  overflow: hidden;
  box-shadow: 0 18px 44px rgba(17, 26, 47, 0.2);
  background: #0d1120;
}

#gameCanvas {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
}

.panel {
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--panel);
  padding: 1rem;
  box-shadow: 0 18px 44px rgba(17, 26, 47, 0.12);
  display: grid;
  gap: 0.6rem;
  align-content: start;
}

button {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 0.6rem 0.72rem;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
  background: #fff;
}

button:hover:enabled {
  background: #f4f5ff;
}

button:disabled {
  opacity: 0.55;
}

#startBtn {
  background: var(--accent);
  color: #fff;
  border-color: transparent;
}

.stats {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
  padding: 0.55rem;
}

.stats p {
  margin: 0.35rem 0;
  display: flex;
  justify-content: space-between;
}

.meta {
  margin: 0;
  font-size: 0.86rem;
  color: #505c78;
}

kbd {
  border: 1px solid rgba(17, 26, 47, 0.26);
  border-radius: 6px;
  padding: 0.1rem 0.3rem;
  background: #fff;
}

@media (max-width: 980px) {
  .layout {
    grid-template-columns: 1fr;
  }
}