:root {
  --bg-top: #040b16;
  --bg-bottom: #132238;
  --accent: #ffb703;
  --accent-2: #ff7b54;
  --ink: #f7fbff;
  --muted: rgba(230, 238, 248, 0.72);
  --panel: rgba(10, 19, 34, 0.52);
  --panel-strong: rgba(7, 13, 24, 0.82);
  --panel-border: rgba(255, 255, 255, 0.1);
  --glow-cyan: rgba(110, 231, 255, 0.16);
  --glow-orange: rgba(255, 183, 3, 0.18);
  --pipe: #68d391;
  --pipe-dark: #2f855a;
  --bird: #ffd166;
  --bird-wing: #f3722c;
  --danger: #ff6b6b;
}

* {
  box-sizing: border-box;
}

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

body {
  display: grid;
  place-items: center;
  overflow: hidden;
  background:
    radial-gradient(circle at 18% 18%, var(--glow-cyan), transparent 24%),
    radial-gradient(circle at 82% 12%, var(--glow-orange), transparent 28%),
    radial-gradient(circle at 50% 120%, rgba(37, 99, 235, 0.26), transparent 34%),
    linear-gradient(160deg, #020611 0%, #07111f 35%, #10233a 100%);
  color: var(--ink);
  font-family: "Manrope", sans-serif;
}

.game-shell {
  width: min(100vw, 480px);
  min-height: 100vh;
  padding: 18px;
  display: grid;
  grid-template-rows: auto 1fr auto;
  gap: 16px;
}

.hud,
.controls {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}

.score-stack {
  display: flex;
  align-items: center;
  gap: 10px;
}

.brand {
  margin: 0;
  font-family: "Bungee", cursive;
  font-size: clamp(1.25rem, 4vw, 1.8rem);
  letter-spacing: 0.06em;
  color: var(--accent);
  text-shadow: 0 10px 24px rgba(255, 183, 3, 0.2);
}

.scoreboard,
.controls,
.overlay {
  backdrop-filter: blur(14px);
}

.scoreboard {
  min-width: 112px;
  display: grid;
  justify-items: center;
  gap: 2px;
  padding: 7px 14px;
  border: 1px solid var(--panel-border);
  border-radius: 18px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.08), rgba(255, 255, 255, 0.02)),
    var(--panel);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.08),
    0 14px 34px rgba(0, 0, 0, 0.2);
}

.highscore-board {
  background:
    linear-gradient(180deg, rgba(255, 183, 3, 0.14), rgba(255, 123, 84, 0.05)),
    rgba(29, 18, 5, 0.54);
}

.score-label,
.helper,
.controls {
  color: var(--muted);
}

#score,
#highScore {
  font-size: 1.35rem;
  line-height: 1;
}

.play-area {
  position: relative;
  overflow: hidden;
  border-radius: 30px;
  background:
    radial-gradient(circle at top left, rgba(110, 231, 255, 0.12), transparent 26%),
    radial-gradient(circle at bottom right, rgba(255, 123, 84, 0.14), transparent 28%),
    linear-gradient(180deg, rgba(10, 20, 37, 0.9), rgba(7, 12, 24, 0.96));
  border: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.1),
    0 28px 90px rgba(0, 0, 0, 0.42);
  isolation: isolate;
}

.sky-layer,
.sun-glow,
.overlay,
#gameCanvas {
  position: absolute;
  inset: 0;
}

.sky-layer {
  animation: drift 20s linear infinite;
}

.sky-back {
  background:
    radial-gradient(circle at 18% 24%, rgba(110, 231, 255, 0.24), transparent 18%),
    radial-gradient(circle at 76% 16%, rgba(255, 183, 3, 0.16), transparent 16%),
    linear-gradient(180deg, rgba(66, 153, 225, 0.08), transparent 60%);
  opacity: 0.95;
}

.sky-mid {
  background:
    radial-gradient(circle at 24% 72%, rgba(255, 255, 255, 0.08), transparent 14%),
    radial-gradient(circle at 82% 58%, rgba(110, 231, 255, 0.1), transparent 14%),
    linear-gradient(180deg, transparent 0%, rgba(255, 255, 255, 0.05) 100%);
  animation-duration: 12s;
}

.sun-glow {
  inset: auto auto -8% -4%;
  width: 260px;
  height: 260px;
  border-radius: 50%;
  background:
    radial-gradient(circle, rgba(255, 183, 3, 0.7), rgba(255, 123, 84, 0.22) 42%, transparent 72%);
  filter: blur(18px);
  opacity: 0.95;
}

#gameCanvas {
  width: 100%;
  height: 100%;
  display: block;
}

.overlay {
  display: grid;
  align-content: center;
  justify-items: start;
  gap: 14px;
  padding: clamp(24px, 6vw, 38px);
  background:
    linear-gradient(180deg, rgba(4, 10, 21, 0.16), rgba(4, 10, 21, 0.74));
  z-index: 2;
  transition: opacity 220ms ease, visibility 220ms ease;
}

.overlay h1,
.overlay h2,
.overlay p {
  margin: 0;
}

.overlay h1,
.overlay h2 {
  max-width: 10ch;
  font-size: clamp(2rem, 7vw, 3.4rem);
  line-height: 0.95;
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-size: 0.75rem;
  color: var(--accent);
}

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

button {
  border: 0;
  border-radius: 999px;
  padding: 14px 20px;
  font: inherit;
  font-weight: 800;
  color: #132f53;
  background: linear-gradient(135deg, var(--accent), #ffd56b);
  cursor: pointer;
  transition: transform 160ms ease, box-shadow 160ms ease;
  box-shadow: 0 12px 30px rgba(255, 183, 3, 0.26);
}

button:hover,
button:focus-visible {
  transform: translateY(-2px);
}

kbd {
  padding: 4px 8px;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.12);
  font-family: inherit;
  font-weight: 700;
}

.controls {
  flex-wrap: wrap;
  justify-content: center;
  padding: 12px 14px 4px;
  border: 1px solid var(--panel-border);
  border-radius: 20px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.05), rgba(255, 255, 255, 0.02)),
    rgba(7, 13, 24, 0.46);
  box-shadow: 0 16px 38px rgba(0, 0, 0, 0.18);
  font-size: 0.9rem;
}

.play-area.shake {
  animation: shake 180ms linear;
}

@keyframes drift {
  from {
    transform: translateX(0);
  }
  to {
    transform: translateX(-18px);
  }
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-8px); }
  50% { transform: translateX(8px); }
  75% { transform: translateX(-4px); }
}

@media (max-width: 520px) {
  .hud {
    align-items: flex-start;
  }

  .score-stack {
    flex-direction: column;
    align-items: stretch;
  }

  .game-shell {
    width: 100vw;
    padding: 12px;
    gap: 12px;
  }

  .play-area {
    border-radius: 24px;
  }

  .controls {
    font-size: 0.8rem;
    gap: 8px 14px;
  }
}