:root {
  --bg1: #06151f;
  --bg2: #0f2d40;
  --panel: #0b1d2a;
  --text: #eaf6ff;
  --accent: #54d0ff;
  --danger: #ff5d73;
  --gate: #73e5ff;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Trebuchet MS", "Segoe UI", sans-serif;
  color: var(--text);
  background: radial-gradient(circle at 20% 20%, #12364d, var(--bg1) 45%),
              linear-gradient(130deg, var(--bg1), var(--bg2));
  min-height: 100vh;
  display: grid;
  place-items: center;
}

.game-wrap {
  width: min(100%, 1020px);
  padding: 20px;
}

h1 {
  margin: 0 0 8px;
  font-size: clamp(1.4rem, 2.6vw, 2rem);
}

.hint {
  margin: 0 0 14px;
  opacity: 0.9;
}

.hud {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 16px;
  justify-content: space-between;
  background: color-mix(in oklab, var(--panel), black 10%);
  border: 1px solid color-mix(in oklab, var(--accent), black 40%);
  border-radius: 8px;
  padding: 10px 12px;
  margin-bottom: 10px;
}

canvas {
  width: 100%;
  aspect-ratio: 16 / 9;
  display: block;
  border-radius: 10px;
  border: 2px solid color-mix(in oklab, var(--accent), black 45%);
  background: #020c13;
}

button {
  margin-top: 12px;
  background: var(--accent);
  border: 0;
  color: #04283b;
  font-weight: 700;
  padding: 10px 14px;
  border-radius: 8px;
  cursor: pointer;
}

button:hover {
  filter: brightness(1.06);
}