:root {
  color-scheme: dark;
  --bg: #050717;
  --panel: rgba(8, 14, 36, 0.78);
  --cyan: #39f5ff;
  --violet: #a855f7;
  --pink: #ff3d9a;
  --green: #74ff8b;
  --text: #edf7ff;
  --muted: #8fa4c7;
}

* {
  box-sizing: border-box;
}

body {
  min-height: 100vh;
  margin: 0;
  overflow-x: hidden;
  background:
    radial-gradient(circle at 20% 10%, rgba(57, 245, 255, 0.18), transparent 30%),
    radial-gradient(circle at 80% 0%, rgba(168, 85, 247, 0.22), transparent 35%),
    linear-gradient(135deg, #030510 0%, #0a102a 50%, #12051e 100%);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

body::before {
  position: fixed;
  inset: 0;
  z-index: -1;
  content: "";
  background-image:
    linear-gradient(rgba(57, 245, 255, 0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(57, 245, 255, 0.08) 1px, transparent 1px);
  background-size: 42px 42px;
  mask-image: linear-gradient(to bottom, black, transparent 85%);
}

.shell {
  width: min(1180px, calc(100vw - 28px));
  margin: 0 auto;
  padding: 28px 0;
}

.hero {
  display: grid;
  gap: 4px;
  margin-bottom: 18px;
}

.eyebrow {
  margin: 0;
  color: var(--cyan);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.24em;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  font-size: clamp(2.6rem, 8vw, 5.6rem);
  line-height: 0.88;
  text-shadow: 0 0 28px rgba(57, 245, 255, 0.55);
}

.subtitle {
  max-width: 680px;
  margin: 8px 0 0;
  color: var(--muted);
  font-size: clamp(1rem, 2vw, 1.18rem);
}

.game-card {
  position: relative;
  overflow: hidden;
  border: 1px solid rgba(57, 245, 255, 0.28);
  border-radius: 26px;
  background: var(--panel);
  box-shadow: 0 28px 90px rgba(0, 0, 0, 0.42), inset 0 0 50px rgba(57, 245, 255, 0.06);
}

canvas {
  display: block;
  width: 100%;
  aspect-ratio: 1100 / 620;
  touch-action: none;
}

.hud,
.controls {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 10px 18px;
  padding: 12px 18px;
  border-top: 1px solid rgba(57, 245, 255, 0.18);
  color: var(--muted);
  font-size: 0.92rem;
}

.hud {
  align-items: center;
  color: var(--text);
  background: rgba(2, 5, 14, 0.44);
}

.difficulty-control {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.difficulty-control select {
  border: 1px solid rgba(57, 245, 255, 0.42);
  border-radius: 999px;
  padding: 4px 28px 4px 10px;
  background: #071127;
  color: var(--text);
  font: inherit;
}

.controls {
  background: rgba(5, 8, 20, 0.7);
}

@media (max-width: 680px) {
  .shell {
    width: min(100vw - 18px, 1180px);
    padding-top: 16px;
  }

  .game-card {
    border-radius: 18px;
  }

  .hud,
  .controls {
    display: grid;
    justify-content: stretch;
    font-size: 0.82rem;
  }
}