:root {
  --bg-a: #0e1022;
  --bg-b: #202f52;
  --edge: #2c3f64;
  --shell-shadow: rgba(3, 6, 14, 0.55);
  --safe-top: env(safe-area-inset-top, 0px);
  --safe-right: env(safe-area-inset-right, 0px);
  --safe-bottom: env(safe-area-inset-bottom, 0px);
  --safe-left: env(safe-area-inset-left, 0px);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  width: 100%;
  height: 100%;
  min-height: 100dvh;
  overflow: hidden;
  font-family: "Trebuchet MS", "Segoe UI", sans-serif;
  overscroll-behavior: none;
  -webkit-tap-highlight-color: transparent;
  background:
    radial-gradient(circle at 8% 12%, rgba(173, 225, 255, 0.18), transparent 35%),
    radial-gradient(circle at 80% 0%, rgba(99, 205, 255, 0.15), transparent 32%),
    linear-gradient(160deg, var(--bg-a), var(--bg-b));
}

.shell {
  position: relative;
  width: 100vw;
  height: 100vh;
  height: 100dvh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding-top: var(--safe-top);
  padding-right: var(--safe-right);
  padding-bottom: var(--safe-bottom);
  padding-left: var(--safe-left);
  background: transparent;
}

.intro-video-asset {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0;
  pointer-events: none;
  z-index: 0;
  transition: opacity 220ms ease;
  background: #050d18;
}

.intro-video-asset.is-visible {
  opacity: 1;
}

#game-canvas {
  position: relative;
  z-index: 1;
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  max-height: 100%;
  aspect-ratio: 1366 / 768;
  border: none;
  border-radius: 0;
  box-shadow: none;
  image-rendering: auto;
  cursor: pointer;
  touch-action: none;
}

.leaderboard-name-input,
.leaderboard-save-btn {
  position: absolute;
  z-index: 30;
  display: none;
  pointer-events: auto;
}

.leaderboard-name-input {
  border: 2px solid rgba(122, 218, 255, 0.9);
  border-radius: 10px;
  padding: 0 12px;
  background: rgba(7, 17, 32, 0.92);
  color: #eff7ff;
  font: 700 clamp(17px, 2.2vw, 24px)/1 "Trebuchet MS", "Segoe UI", sans-serif;
  outline: none;
}

.leaderboard-name-input:focus {
  border-color: rgba(149, 255, 171, 0.95);
  box-shadow: 0 0 0 2px rgba(149, 255, 171, 0.3);
}

.leaderboard-name-input::placeholder {
  color: rgba(220, 238, 255, 0.72);
}

.leaderboard-save-btn {
  border: 2px solid rgba(148, 255, 170, 0.9);
  border-radius: 10px;
  background: rgba(20, 56, 32, 0.94);
  color: #ecfff1;
  font: 800 clamp(16px, 2vw, 22px)/1 "Trebuchet MS", "Segoe UI", sans-serif;
  cursor: pointer;
}

.leaderboard-save-btn:active {
  transform: translateY(1px);
}

@media (max-width: 900px) {
  #game-canvas {
    border-radius: 0;
  }

  .leaderboard-name-input {
    font-size: 18px;
  }

  .leaderboard-save-btn {
    font-size: 17px;
  }
}