:root {
  color-scheme: dark;
  --bg: #0b1020;
  --panel: #151b30;
  --accent: #4ad7ff;
  --accent-2: #f8c045;
  --text: #f5f7ff;
  --muted: #9fa8c4;
  font-family: "Inter", system-ui, sans-serif;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  min-height: 100vh;
  background: radial-gradient(circle at top, #1a2040 0%, var(--bg) 55%);
  color: var(--text);
  display: flex;
  justify-content: center;
  padding: 32px 16px 64px;
}

.page {
  width: min(1080px, 100%);
  display: grid;
  gap: 24px;
}

header {
  text-align: center;
  display: grid;
  gap: 8px;
}

header h1 {
  font-size: clamp(2rem, 3vw, 2.8rem);
}

header p {
  color: var(--muted);
}

main {
  display: grid;
  gap: 20px;
}

.hud {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 12px;
  background: var(--panel);
  padding: 16px 20px;
  border-radius: 16px;
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.25);
  font-size: 1rem;
}

.game-wrapper {
  position: relative;
  border-radius: 20px;
  overflow: hidden;
  background: #0a0f1f;
  border: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.35);
}

canvas {
  display: block;
  width: 100%;
  height: auto;
}

.overlay {
  position: absolute;
  inset: 0;
  display: grid;
  place-content: center;
  gap: 12px;
  text-align: center;
  background: rgba(7, 10, 20, 0.82);
  padding: 24px;
}

.overlay.hidden {
  display: none;
}

.overlay h2 {
  font-size: clamp(1.6rem, 3vw, 2.4rem);
}

.overlay p {
  color: var(--muted);
  max-width: 480px;
}

button {
  border: none;
  background: linear-gradient(120deg, var(--accent), #6b7bff);
  color: #0b1020;
  padding: 12px 20px;
  border-radius: 999px;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

button:hover {
  transform: translateY(-1px) scale(1.02);
  box-shadow: 0 10px 20px rgba(74, 215, 255, 0.35);
}

.tips {
  background: var(--panel);
  padding: 16px 20px;
  border-radius: 16px;
  color: var(--muted);
  line-height: 1.5;
}

.tips h3 {
  color: var(--text);
  margin-bottom: 8px;
}

.tips ul {
  display: grid;
  gap: 6px;
  padding-left: 18px;
}

footer {
  text-align: center;
  color: var(--muted);
  font-size: 0.9rem;
}

@media (max-width: 720px) {
  body {
    padding: 24px 12px 48px;
  }

  .hud {
    font-size: 0.95rem;
  }
}