:root {
  color-scheme: dark;
  --bg: #06111f;
  --bg2: #0a1b33;
  --panel: rgba(10, 18, 32, 0.7);
  --panel-border: rgba(130, 190, 255, 0.18);
  --text: #e9f3ff;
  --muted: rgba(233, 243, 255, 0.7);
  --accent: #5ce1ff;
  --accent2: #8dfd9f;
  --danger: #ff6b87;
  --gold: #ffd166;
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.45);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  font-family: "Space Grotesk", system-ui, sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top, rgba(92, 225, 255, 0.16), transparent 35%),
    radial-gradient(circle at 80% 20%, rgba(141, 253, 159, 0.12), transparent 30%),
    linear-gradient(160deg, var(--bg), var(--bg2));
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(circle at center, black, transparent 85%);
}

.shell {
  min-height: 100vh;
  padding: 32px;
  display: grid;
  place-items: center;
}

.hero {
  width: min(1180px, 100%);
  display: grid;
  gap: 24px;
  grid-template-columns: 0.9fr 1.1fr;
  align-items: center;
}

.copy {
  padding: 18px 8px;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.24em;
  font-size: 0.78rem;
}

h1 {
  margin: 0;
  font-size: clamp(3rem, 8vw, 6.5rem);
  line-height: 0.92;
}

.lede {
  max-width: 42ch;
  margin: 18px 0 0;
  color: var(--muted);
  font-size: 1.08rem;
  line-height: 1.6;
}

.panel {
  padding: 18px;
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 28px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}

.stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-bottom: 14px;
}

.stats div {
  padding: 14px 16px;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.07);
}

.stats span,
.hint span {
  display: block;
  color: var(--muted);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.18em;
}

.stats strong {
  display: block;
  margin-top: 8px;
  font-size: 2rem;
}

.canvas-wrap {
  position: relative;
  overflow: hidden;
  border-radius: 24px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  background:
    radial-gradient(circle at center, rgba(92, 225, 255, 0.08), transparent 55%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.06), rgba(255, 255, 255, 0.02));
}

canvas {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 10;
  touch-action: none;
}

.overlay {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  background: rgba(5, 12, 22, 0.5);
  backdrop-filter: blur(8px);
  transition: opacity 180ms ease, visibility 180ms ease;
}

.overlay.hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.overlay-card {
  width: min(320px, calc(100% - 32px));
  padding: 24px;
  border-radius: 22px;
  background: rgba(9, 17, 31, 0.84);
  border: 1px solid rgba(255, 255, 255, 0.1);
  text-align: center;
  box-shadow: 0 18px 60px rgba(0, 0, 0, 0.4);
}

.overlay-title {
  margin: 0;
  font-size: 1.6rem;
  font-weight: 700;
}

.overlay-text {
  margin: 10px 0 18px;
  color: var(--muted);
  line-height: 1.6;
}

button {
  appearance: none;
  border: 0;
  cursor: pointer;
  font: inherit;
}

#startBtn {
  padding: 12px 18px;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  color: #02101b;
  font-weight: 700;
}

.hud {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-top: 14px;
}

.hint {
  padding: 14px 16px;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.07);
}

.hint p {
  margin: 8px 0 0;
  color: var(--muted);
  line-height: 1.5;
}

@media (max-width: 920px) {
  .hero {
    grid-template-columns: 1fr;
  }

  .copy {
    padding-bottom: 0;
  }
}

@media (max-width: 640px) {
  .shell {
    padding: 16px;
  }

  .stats,
  .hud {
    grid-template-columns: 1fr;
  }

  .panel {
    padding: 12px;
    border-radius: 22px;
  }

  .stats strong {
    font-size: 1.65rem;
  }
}