:root {
  color-scheme: dark;
  font-family: "Inter", "Segoe UI", system-ui, sans-serif;
  --bg-top: #1a0a3a;
  --bg-mid: #0f0625;
  --bg-bottom: #0a0520;
  --panel-border: rgba(0, 229, 255, 0.22);
  --panel-glow: rgba(0, 200, 255, 0.15);
  --text-primary: #dce8f8;
  --text-secondary: #b8cceb;
  --text-muted: #8ea4c8;
  --accent-a: #00e5ff;
  --accent-b: #7c3aed;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  -webkit-user-select: none;
  user-select: none;
  -webkit-touch-callout: none;
  background:
    radial-gradient(ellipse at 15% 15%, rgba(0, 229, 255, 0.12) 0%, transparent 45%),
    radial-gradient(ellipse at 85% 8%, rgba(124, 58, 237, 0.10) 0%, transparent 40%),
    radial-gradient(ellipse at 50% 120%, rgba(0, 180, 220, 0.15) 0%, transparent 50%),
    radial-gradient(ellipse at 40% 60%, rgba(0, 229, 255, 0.04) 0%, transparent 60%),
    linear-gradient(180deg, var(--bg-top) 0%, var(--bg-mid) 50%, var(--bg-bottom) 100%);
  color: var(--text-primary);
}

.layout {
  width: min(1360px, 100%);
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(280px, 340px) minmax(0, 1fr);
  gap: 1rem;
  padding: 1.25rem;
  align-items: start;
}

.hud-panel {
  position: relative;
  overflow: hidden;
  background:
    linear-gradient(150deg, rgba(0, 180, 220, 0.18), rgba(30, 10, 70, 0.45)),
    linear-gradient(0deg, rgba(4, 2, 20, 0.35), rgba(4, 2, 20, 0.35));
  border: 1px solid var(--panel-border);
  border-radius: 16px;
  padding: 1rem;
  backdrop-filter: blur(10px);
  box-shadow:
    inset 0 0 0 1px rgba(0, 229, 255, 0.03),
    0 12px 40px rgba(0, 0, 0, 0.35),
    0 0 40px -10px var(--panel-glow);
}

.hud-panel::after {
  content: "";
  position: absolute;
  inset: -40% 8% auto;
  height: 40%;
  background: radial-gradient(ellipse at center, rgba(0, 229, 255, 0.10) 0%, transparent 70%);
  pointer-events: none;
}

.back-link {
  display: inline-block;
  margin-bottom: 0.5rem;
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.9rem;
  opacity: 0.65;
  transition: opacity 0.3s ease, color 0.3s ease;
}

.back-link:hover {
  opacity: 1;
  color: var(--text-primary);
}

.hud-panel h1 {
  margin: 0 0 0.5rem;
  font-size: clamp(1.4rem, 1.8vw, 1.9rem);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  background: linear-gradient(135deg, #00e5ff, #7c3aed);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hud-panel p {
  margin: 0 0 0.95rem;
  color: var(--text-secondary);
  line-height: 1.55;
  font-size: 0.96rem;
}

.hud-panel strong {
  color: #eaf4ff;
}

.stats {
  display: grid;
  gap: 0.6rem;
}

.stats div {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border: 1px solid rgba(0, 229, 255, 0.15);
  border-radius: 10px;
  padding: 0.62rem 0.78rem;
  background: rgba(3, 2, 20, 0.4);
  box-shadow: inset 0 0 28px rgba(0, 229, 255, 0.05);
  transition: border-color 0.4s ease, box-shadow 0.4s ease;
}

.stats div:hover {
  border-color: rgba(0, 229, 255, 0.28);
  box-shadow: inset 0 0 28px rgba(0, 229, 255, 0.09);
}

.stats span {
  color: var(--text-muted);
  letter-spacing: 0.02em;
  font-size: 0.92rem;
}

.stats strong {
  color: #deeeff;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
}

.fuel-bar-bg {
  width: 100%;
  height: 8px;
  background: rgba(255,255,255,0.1);
  border-radius: 4px;
  overflow: hidden;
  margin-top: 2px;
}

.fuel-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, #00e5ff, #7c3aed);
  border-radius: 4px;
  transition: width 0.15s ease;
}

.mute-btn {
  margin-top: 0.75rem;
  width: 100%;
  padding: 0.55rem;
  border-radius: 10px;
  border: 1px solid rgba(0, 229, 255, 0.2);
  color: var(--text-secondary);
  background: rgba(3, 2, 20, 0.5);
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  cursor: pointer;
  transition: border-color 0.3s ease, color 0.3s ease;
}

.mute-btn:hover {
  border-color: rgba(0, 229, 255, 0.4);
  color: var(--text-primary);
}

.mute-btn:focus-visible {
  outline: 2px solid rgba(0, 229, 255, 0.8);
  outline-offset: 2px;
}

.restart-btn {
  margin-top: 0.6rem;
  width: 100%;
  padding: 0.72rem;
  border-radius: 10px;
  border: 1px solid rgba(0, 229, 255, 0.35);
  color: #eef8ff;
  background: linear-gradient(120deg, var(--accent-a), var(--accent-b));
  font-size: 0.98rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  cursor: pointer;
  transition: transform 150ms ease, filter 150ms ease, box-shadow 200ms ease;
}

.restart-btn:hover {
  filter: brightness(1.1);
  box-shadow:
    0 8px 20px rgba(0, 229, 255, 0.3),
    0 0 20px rgba(124, 58, 237, 0.15);
}

.restart-btn:active {
  transform: translateY(1px) scale(0.996);
}

.restart-btn:focus-visible {
  outline: 2px solid rgba(0, 229, 255, 0.8);
  outline-offset: 2px;
}

.fullscreen-btn {
  margin-top: 0.5rem;
  width: 100%;
  padding: 0.55rem;
  border-radius: 10px;
  border: 1px solid rgba(0, 229, 255, 0.2);
  color: var(--text-secondary);
  background: rgba(3, 2, 20, 0.5);
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  cursor: pointer;
  transition: border-color 0.3s ease, color 0.3s ease;
}

.fullscreen-btn:hover {
  border-color: rgba(0, 229, 255, 0.4);
  color: var(--text-primary);
}

.fullscreen-btn:focus-visible {
  outline: 2px solid rgba(0, 229, 255, 0.8);
  outline-offset: 2px;
}

.game-canvas {
  width: 100%;
  height: calc(100vh - 2.5rem);
  border-radius: 16px;
  touch-action: none;
  -webkit-user-select: none;
  user-select: none;
  border: 1px solid rgba(0, 229, 255, 0.20);
  box-shadow:
    inset 0 0 30px rgba(0, 229, 255, 0.10),
    inset 0 -20px 80px rgba(124, 58, 237, 0.06),
    0 24px 60px rgba(0, 0, 0, 0.4),
    0 0 50px -15px rgba(0, 229, 255, 0.08);
  background: #040614;
  object-fit: contain;
}

.game-canvas:fullscreen,
.game-canvas:-webkit-full-screen {
  width: 100vw;
  height: 100vh;
  object-fit: contain;
  border: none;
  border-radius: 0;
  background: #000;
  image-rendering: auto;
  box-shadow:
    0 0 80px rgba(0, 229, 255, 0.10),
    0 0 160px rgba(0, 229, 255, 0.05);
}

.lang-switcher {
  margin-bottom: 0.5rem;
}

.lang-switcher select {
  background: rgba(3, 2, 20, 0.5);
  border: 1px solid rgba(0, 229, 255, 0.2);
  border-radius: 8px;
  color: var(--text-secondary);
  padding: 0.35rem 0.7rem;
  font-size: 0.9rem;
  font-family: inherit;
  cursor: pointer;
  outline: none;
  transition: border-color 0.3s ease, color 0.3s ease;
}

.lang-switcher select:hover {
  border-color: rgba(0, 229, 255, 0.4);
  color: var(--text-primary);
}

.lang-switcher select:focus-visible {
  outline: 2px solid rgba(0, 229, 255, 0.8);
  outline-offset: 2px;
}

.lang-switcher select option {
  background: var(--bg-mid);
  color: var(--text-primary);
}

@media (max-width: 980px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .game-canvas {
    width: 100%;
  }
}

/* --- Mobile portrait: fill viewport --- */
@media (max-width: 600px) {
  html, body {
    min-height: 100dvh;
    min-height: 100vh;
    overflow-x: hidden;
    overscroll-behavior-x: none;
  }

  body {
    margin: 0;
  }

  .layout {
    grid-template-columns: 1fr;
    padding: 8px 6px;
    gap: 6px;
    height: 100%;
    grid-template-rows: auto 1fr;
    align-items: stretch;
  }

  .hud-panel {
    padding: 8px 10px;
    border-radius: 12px;
  }

  .hud-panel h1 {
    font-size: 1.2rem;
    margin-bottom: 4px;
  }

  .hud-panel p {
    display: none;
  }

  .back-link {
    font-size: 0.82rem;
    margin-bottom: 2px;
  }

  .stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4px;
  }

  .stats div {
    padding: 4px 8px;
    border-radius: 8px;
    font-size: 0.82rem;
  }

  .stats span {
    font-size: 0.78rem;
  }

  .mute-btn,
  .fullscreen-btn {
    padding: 6px;
    font-size: 0.82rem;
    margin-top: 4px;
  }

  .restart-btn {
    padding: 8px;
    font-size: 0.88rem;
    margin-top: 4px;
  }

  .game-canvas {
    width: 100%;
    height: auto;
    max-height: 100%;
    border-radius: 12px;
    min-height: 0;
  }
}

/* --- Very short phones --- */
@media (max-width: 600px) and (max-height: 620px) {
  .layout {
    padding: 4px 4px;
    gap: 4px;
  }

  .hud-panel {
    padding: 6px 8px;
  }

  .hud-panel h1 {
    font-size: 1rem;
    margin-bottom: 2px;
  }

  .back-link {
    display: none;
  }

  .stats {
    gap: 3px;
  }

  .stats div {
    padding: 3px 6px;
    font-size: 0.78rem;
  }

  .mute-btn,
  .fullscreen-btn {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .restart-btn,
  .mute-btn {
    transition: none;
  }
}

/* -- Achievements -- */
.achievements-panel { text-align: center; margin-top: 0.5rem; }
.achievements-toggle {
  border: 1px solid rgba(0,229,255,0.2);
  border-radius: 999px; padding: 8px 20px;
  background: rgba(10,5,30,0.6); color: rgba(0,229,255,0.7);
  font-weight: 600; font-size: 0.85rem; cursor: pointer; font-family: inherit;
  transition: background 0.2s, border-color 0.2s;
}
.achievements-toggle:hover { background: rgba(0,229,255,0.08); border-color: rgba(0,229,255,0.4); }
.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(0,229,255,0.1);
  background: rgba(10,5,30,0.5); color: rgba(0,229,255,0.4);
  transition: all 0.3s;
}
.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(10,5,30,0.95); 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(0,229,255,0.7); font-size: 0.78rem; }