:root {
  color-scheme: dark;
  font-family: "Trebuchet MS", "Segoe UI", system-ui, sans-serif;
  background: #060818;
  color: #e0e8ff;
}

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

body {
  display: flex;
  justify-content: center;
  min-height: 100vh;
  padding: 32px 16px;
  -webkit-user-select: none;
  user-select: none;
  -webkit-touch-callout: none;
  background:
    radial-gradient(ellipse at 30% 20%, rgba(100,140,255,0.06) 0%, transparent 60%),
    radial-gradient(ellipse at 70% 80%, rgba(255,180,60,0.04) 0%, transparent 60%),
    linear-gradient(170deg, #060818 0%, #0c1030 40%, #040610 100%);
  transition: background 0.5s ease;
}

body.theme-nebula {
  background:
    radial-gradient(ellipse at 30% 20%, rgba(180,80,220,0.08) 0%, transparent 60%),
    radial-gradient(ellipse at 70% 80%, rgba(255,100,180,0.06) 0%, transparent 60%),
    linear-gradient(170deg, #100820 0%, #1a0c30 40%, #080410 100%);
}
body.theme-ocean {
  background:
    radial-gradient(ellipse at 30% 20%, rgba(0,160,220,0.08) 0%, transparent 60%),
    radial-gradient(ellipse at 70% 80%, rgba(0,100,180,0.06) 0%, transparent 60%),
    linear-gradient(170deg, #040c1a 0%, #081828 40%, #020810 100%);
}

.game {
  max-width: 540px;
  width: 100%;
  display: grid;
  gap: 16px;
}

.game__header, .game__footer { text-align: center; }

.back-link {
  display: inline-block;
  margin-bottom: 8px;
  color: #c0d0ff;
  text-decoration: none;
  font-weight: 700;
  font-size: 0.95rem;
  opacity: 0.5;
  transition: opacity 0.2s ease, transform 0.2s ease;
}
.back-link:hover { opacity: 1; transform: translateX(-2px); }

.game__header h1 {
  font-size: 2.2rem;
  margin-bottom: 4px;
  letter-spacing: 0.02em;
  background: linear-gradient(90deg, #ffd700, #ff8c00, #ffd700);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.game__header p { color: rgba(200,210,255,0.6); font-size: 0.95rem; }

.game__panel {
  background: rgba(8,10,25,0.85);
  border-radius: 18px;
  padding: 16px;
  box-shadow: 0 20px 50px rgba(0,0,0,0.5), 0 4px 12px rgba(0,0,0,0.3);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(100,140,255,0.08);
  display: grid;
  gap: 12px;
  justify-items: center;
}

canvas {
  width: min(100%, 480px);
  height: auto;
  aspect-ratio: 480 / 640;
  background: #04060e;
  border-radius: 14px;
  border: 2px solid rgba(100,140,255,0.2);
  box-shadow: inset 0 2px 8px rgba(0,0,0,0.3), 0 0 30px rgba(100,140,255,0.06);
  touch-action: manipulation;
  user-select: none;
  -webkit-user-select: none;
}

.game__hud {
  width: 100%;
  display: grid;
  grid-template-columns: 1fr 1fr auto auto auto auto;
  align-items: center;
  gap: 12px;
}

.hud__score {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 3px;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: rgba(200,210,255,0.5);
}
.hud__score strong {
  font-size: 1.7rem;
  color: #e0e8ff;
  letter-spacing: 0.02em;
  font-variant-numeric: tabular-nums;
}

.hud__mute {
  border: none;
  background: none;
  font-size: 1.4rem;
  cursor: pointer;
  padding: 6px 8px;
  border-radius: 8px;
  line-height: 1;
  color: #e0e8ff;
  transition: background 0.15s ease, transform 0.15s ease;
}
.hud__mute:hover { background: rgba(100,140,255,0.1); transform: scale(1.1); }
.hud__mute:active { transform: scale(0.95); }

.hud__button {
  border: none;
  border-radius: 999px;
  padding: 10px 20px;
  background: linear-gradient(135deg, #ffd700, #ff8c00);
  color: #0a0810;
  font-weight: 700;
  font-size: 0.9rem;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
  justify-self: end;
  box-shadow: 0 4px 10px rgba(255,180,0,0.2);
}
.hud__button:hover { transform: translateY(-2px); box-shadow: 0 8px 20px rgba(255,180,0,0.3); }
.hud__button:active { transform: translateY(0); box-shadow: 0 2px 6px rgba(255,180,0,0.15); }

.settings-bar { width: 100%; display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.setting-group { display: flex; align-items: center; gap: 6px; font-size: 0.82rem; color: rgba(200,210,255,0.6); }
.setting-group label { text-transform: uppercase; letter-spacing: 0.08em; font-weight: 600; }
.setting-group select {
  background: rgba(10,15,30,0.8);
  color: #e0e8ff;
  border: 1px solid rgba(100,140,255,0.2);
  border-radius: 8px;
  padding: 5px 10px;
  font-size: 0.82rem;
  font-family: inherit;
  cursor: pointer;
  outline: none;
  transition: border-color 0.2s ease;
}
.setting-group select:focus { border-color: rgba(100,140,255,0.5); }

.achievements-panel { text-align: center; }
.achievements-toggle {
  border: 1px solid rgba(100,140,255,0.2);
  border-radius: 999px;
  padding: 8px 20px;
  background: rgba(8,10,25,0.6);
  color: rgba(200,210,255,0.7);
  font-weight: 600;
  font-size: 0.85rem;
  cursor: pointer;
  font-family: inherit;
  transition: background 0.2s ease, border-color 0.2s ease;
}
.achievements-toggle:hover { background: rgba(100,140,255,0.08); border-color: rgba(100,140,255,0.4); }
.achievements-list { display: none; flex-wrap: wrap; gap: 8px; justify-content: center; margin-top: 12px; }
.achievements-list.open { display: flex; }

.achievement-item {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: 10px;
  font-size: 0.78rem;
  border: 1px solid rgba(100,140,255,0.1);
  background: rgba(8,10,25,0.5);
  color: rgba(200,210,255,0.4);
  transition: all 0.3s ease;
}
.achievement-item.unlocked {
  border-color: rgba(255,215,0,0.4);
  background: rgba(255,215,0,0.08);
  color: #ffd700;
}
.achievement-item__icon { font-size: 1.1rem; }

.achievement-popup {
  position: fixed;
  top: 20px;
  left: 50%;
  transform: translateX(-50%) translateY(-120px);
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 20px;
  border-radius: 14px;
  background: rgba(10,10,10,0.95);
  border: 2px solid rgba(255,215,0,0.5);
  box-shadow: 0 8px 30px rgba(0,0,0,0.6), 0 0 20px rgba(255,215,0,0.15);
  z-index: 1000;
  transition: transform 0.5s cubic-bezier(0.34,1.56,0.64,1);
  pointer-events: none;
}
.achievement-popup.show { transform: translateX(-50%) translateY(0); }
.achievement-popup__icon { font-size: 1.6rem; }
.achievement-popup__text { display: flex; flex-direction: column; gap: 2px; }
.achievement-popup__text strong { color: #ffd700; font-size: 0.9rem; }
.achievement-popup__text span { color: rgba(200,210,255,0.7); font-size: 0.78rem; }

.game__footer p { color: rgba(200,210,255,0.4); font-size: 0.88rem; font-style: italic; }

/* Fullscreen */
.game:fullscreen, .game:-webkit-full-screen, .game.pseudo-fullscreen {
  position: fixed; inset: 0; z-index: 9999; max-width: 100%; width: 100%; height: 100%;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  background: #040610; padding: 0; gap: 0; overflow: hidden;
}
.game:fullscreen .game__header, .game:-webkit-full-screen .game__header, .game.pseudo-fullscreen .game__header,
.game:fullscreen .game__footer, .game:-webkit-full-screen .game__footer, .game.pseudo-fullscreen .game__footer,
.game:fullscreen .settings-bar, .game:-webkit-full-screen .settings-bar, .game.pseudo-fullscreen .settings-bar,
.game:fullscreen .achievements-panel, .game:-webkit-full-screen .achievements-panel, .game.pseudo-fullscreen .achievements-panel {
  display: none !important;
}
.game:fullscreen .game__panel, .game:-webkit-full-screen .game__panel, .game.pseudo-fullscreen .game__panel {
  flex: 1; display: flex; flex-direction: column; align-items: center; justify-content: center;
  width: 100%; max-width: 100%; padding: 0; border: none; border-radius: 0; background: transparent; box-shadow: none; gap: 0;
}
.game:fullscreen canvas, .game:-webkit-full-screen canvas, .game.pseudo-fullscreen canvas {
  border-radius: 0; border: none; box-shadow: 0 0 80px rgba(100,140,255,0.08);
}
.game:fullscreen .game__hud, .game:-webkit-full-screen .game__hud, .game.pseudo-fullscreen .game__hud {
  width: auto; max-width: 600px; background: rgba(255,255,255,0.05); border-radius: 12px;
  backdrop-filter: blur(10px); margin-top: 6px; padding: 6px 16px;
}
.game:fullscreen .hud__score, .game:-webkit-full-screen .hud__score, .game.pseudo-fullscreen .hud__score { color: rgba(255,255,255,0.5); }
.game:fullscreen .hud__score strong, .game:-webkit-full-screen .hud__score strong, .game.pseudo-fullscreen .hud__score strong { color: #fff; }
.game:fullscreen .hud__button, .game:-webkit-full-screen .hud__button, .game.pseudo-fullscreen .hud__button { background: rgba(255,255,255,0.1); color: #fff; box-shadow: none; }
.game:fullscreen .hud__mute, .game:-webkit-full-screen .hud__mute, .game.pseudo-fullscreen .hud__mute { color: rgba(255,255,255,0.7); }
.game:fullscreen .lb-toggle-btn, .game:-webkit-full-screen .lb-toggle-btn, .game.pseudo-fullscreen .lb-toggle-btn { display: none; }
.game:fullscreen #leaderboardPanel, .game:-webkit-full-screen #leaderboardPanel, .game.pseudo-fullscreen #leaderboardPanel { display: none !important; }

@media (max-width: 600px) {
  html, body { min-height: 100dvh; min-height: 100vh; overflow-x: hidden; }
  body { padding: 8px 6px; align-items: stretch; }
  .game { max-width: 100%; height: 100%; gap: 6px; }
  .game__header h1 { font-size: 1.4rem; margin-bottom: 0; }
  .game__header p { font-size: 0.78rem; }
  .back-link { font-size: 0.82rem; margin-bottom: 2px; }
  .game__panel { padding: 8px; gap: 8px; border-radius: 14px; overflow: hidden; min-height: 0; display: flex; flex-direction: column; align-items: center; }
  canvas { max-width: 100%; border-radius: 10px; flex-shrink: 0; }
  .game__hud { grid-template-columns: 1fr 1fr auto auto auto auto; gap: 8px; width: 100%; }
  .hud__score { font-size: 0.75rem; gap: 1px; }
  .hud__score strong { font-size: 1.3rem; }
  .hud__button { padding: 8px 14px; font-size: 0.8rem; }
  .achievements-panel, .game__footer { display: none; }
}

@media (max-width: 600px) and (max-height: 620px) {
  body { padding: 4px 4px; }
  .game { gap: 4px; }
  .game__header h1 { font-size: 1.2rem; }
  .game__header p { display: none; }
  .game__panel { padding: 6px; gap: 4px; }
  .settings-bar { display: none; }
}

@media (max-height: 500px) and (orientation: landscape) {
  html, body { min-height: 100dvh; overflow-x: hidden; }
  body { padding: 4px 8px; }
  .game { max-width: 100%; height: 100%; grid-template-rows: auto 1fr; gap: 4px; }
  .game__header h1 { font-size: 1.1rem; margin-bottom: 0; }
  .game__header p, .game__footer, .achievements-panel { display: none; }
  .back-link { font-size: 0.75rem; margin-bottom: 0; }
  .game__panel { padding: 6px; gap: 6px; border-radius: 10px; min-height: 0; overflow: hidden; display: flex; flex-direction: column; align-items: center; }
  canvas { width: auto; max-width: 100%; height: 100%; max-height: 100%; min-height: 0; border-radius: 8px; }
  .settings-bar { display: none; }
}

@media (min-width: 768px) and (max-width: 1194px) {
  body { padding: 40px 24px; }
  .game { max-width: 640px; gap: 20px; }
  .game__panel { padding: 20px; }
  .game__header h1 { font-size: 2.5rem; }
}