:root {
  --bg-dark: #050811;
  --bg-mid: #0c1b2e;
  --panel: rgba(7, 13, 24, 0.72);
  --line: #89f7dc;
  --text: #e8f6ff;
  --hit: #ff6b77;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Orbitron", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 18% 12%, #1c456e 0, transparent 34%),
    radial-gradient(circle at 85% 20%, #1f906f 0, transparent 26%),
    linear-gradient(155deg, var(--bg-dark), var(--bg-mid));
  display: grid;
  place-items: center;
}

.wrap {
  width: min(1080px, 96vw);
  padding: 20px 10px 28px;
}

.top h1 {
  margin: 0;
  font-size: clamp(1.6rem, 4vw, 3rem);
  letter-spacing: 0.14em;
  text-shadow: 0 0 20px rgba(137, 247, 220, 0.34);
}

.top p {
  margin: 8px 0 16px;
  opacity: 0.9;
  font-size: clamp(0.74rem, 1.8vw, 0.95rem);
}

.game-shell {
  position: relative;
  border-radius: 18px;
  border: 1px solid rgba(255, 255, 255, 0.24);
  overflow: hidden;
  box-shadow: 0 26px 70px rgba(0, 0, 0, 0.45);
  background: #090d17;
}

.game-shell::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(120% 65% at 50% 0%, rgba(117, 236, 255, 0.12), transparent 58%),
    linear-gradient(to bottom, rgba(255, 255, 255, 0.04), transparent 22%);
  z-index: 1;
}

#stage {
  width: 100%;
  aspect-ratio: 16 / 9;
}

#stage canvas {
  display: block;
  width: 100%;
  height: 100%;
}

.hud {
  position: absolute;
  top: 10px;
  left: 10px;
  right: 10px;
  display: flex;
  justify-content: space-between;
  gap: 8px;
  padding: 9px 12px;
  border-radius: 11px;
  background: var(--panel);
  backdrop-filter: blur(5px);
  border: 1px solid rgba(255, 255, 255, 0.18);
  font-size: clamp(0.68rem, 1.7vw, 0.9rem);
  z-index: 2;
}

.hud b {
  color: var(--line);
}

#nitro {
  color: #ffe38a;
}

.message {
  position: absolute;
  inset: auto 50% 22px auto;
  transform: translateX(50%);
  max-width: min(90%, 700px);
  text-align: center;
  padding: 10px 14px;
  border-radius: 12px;
  background: rgba(0, 0, 0, 0.6);
  border: 1px solid rgba(255, 255, 255, 0.2);
  font-size: clamp(0.76rem, 2.2vw, 1.08rem);
  z-index: 2;
}

.message.hidden {
  display: none;
}

.message.danger {
  border-color: rgba(255, 107, 119, 0.9);
  color: #ffe8eb;
}

@media (max-width: 640px) {
  .wrap {
    padding-top: 12px;
  }

  .top p {
    line-height: 1.4;
  }
}