:root {
  color-scheme: dark;
  font-family: "Trebuchet MS", "Segoe UI", system-ui, sans-serif;
  background: #04030a;
  color: #c8d0f7;
}

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

body {
  display: flex;
  justify-content: center;
  min-height: 100vh;
  padding: 32px 16px;
  background:
    radial-gradient(ellipse at 30% 20%, rgba(77, 120, 255, 0.06) 0%, transparent 60%),
    radial-gradient(ellipse at 70% 80%, rgba(180, 77, 255, 0.05) 0%, transparent 60%),
    linear-gradient(170deg, #04030a 0%, #0a0820 40%, #06041a 100%);
  transition: background 0.5s ease;
}

/* Theme body backgrounds */
body.theme-inferno {
  background:
    radial-gradient(ellipse at 30% 20%, rgba(255, 80, 20, 0.08) 0%, transparent 60%),
    radial-gradient(ellipse at 70% 80%, rgba(255, 40, 40, 0.06) 0%, transparent 60%),
    linear-gradient(170deg, #0a0404 0%, #1a0a08 40%, #0a0404 100%);
}
body.theme-arctic {
  background:
    radial-gradient(ellipse at 30% 20%, rgba(100, 200, 255, 0.08) 0%, transparent 60%),
    radial-gradient(ellipse at 70% 80%, rgba(150, 220, 255, 0.06) 0%, transparent 60%),
    linear-gradient(170deg, #040810 0%, #081420 40%, #040810 100%);
}
body.theme-toxic {
  background:
    radial-gradient(ellipse at 30% 20%, rgba(100, 255, 50, 0.08) 0%, transparent 60%),
    radial-gradient(ellipse at 70% 80%, rgba(50, 200, 50, 0.06) 0%, transparent 60%),
    linear-gradient(170deg, #040a04 0%, #081a08 40%, #040a04 100%);
}
body.theme-void {
  background:
    radial-gradient(ellipse at 30% 20%, rgba(200, 50, 255, 0.06) 0%, transparent 60%),
    radial-gradient(ellipse at 70% 80%, rgba(100, 0, 200, 0.05) 0%, transparent 60%),
    linear-gradient(170deg, #020008 0%, #080020 40%, #020008 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: #c8d0f7;
  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: 0.06em;
  background: linear-gradient(90deg, #4dc9f6, #b44dff, #ff4da6);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.game__header p {
  color: rgba(200, 208, 247, 0.6);
  font-size: 0.95rem;
}

.game__panel {
  background: rgba(8, 6, 24, 0.85);
  border-radius: 18px;
  padding: 16px;
  box-shadow:
    0 20px 50px rgba(0, 0, 0, 0.4),
    0 4px 12px rgba(0, 0, 0, 0.3);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(77, 201, 246, 0.08);
  display: grid;
  gap: 12px;
  justify-items: center;
}

canvas {
  width: min(100%, 480px);
  height: auto;
  aspect-ratio: 480 / 720;
  background: #020114;
  border-radius: 14px;
  border: 2px solid rgba(77, 201, 246, 0.2);
  box-shadow:
    inset 0 2px 8px rgba(0, 0, 0, 0.5),
    0 0 30px rgba(77, 201, 246, 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;
  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, 208, 247, 0.5);
}

.hud__score strong {
  font-size: 1.7rem;
  color: #c8d0f7;
  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: #c8d0f7;
  transition: background 0.15s ease, transform 0.15s ease;
}

.hud__mute:hover {
  background: rgba(77, 201, 246, 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, #4dc9f6, #b44dff);
  color: #ffffff;
  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(77, 201, 246, 0.2);
}

.hud__button:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(77, 201, 246, 0.3);
}

.hud__button:active {
  transform: translateY(0);
  box-shadow: 0 2px 6px rgba(77, 201, 246, 0.15);
}

/* Settings bar */
.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, 208, 247, 0.6);
}

.setting-group label {
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 600;
}

.setting-group select {
  background: rgba(20, 16, 40, 0.8);
  color: #c8d0f7;
  border: 1px solid rgba(77, 201, 246, 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(77, 201, 246, 0.5);
}

/* Mobile controls */
.mobile-controls {
  display: none;
  gap: 12px;
  justify-content: center;
  align-items: center;
  margin-top: 4px;
}

.ctrl-btn {
  width: 64px;
  height: 64px;
  border: 2px solid rgba(77, 201, 246, 0.3);
  border-radius: 14px;
  background: rgba(8, 6, 24, 0.7);
  color: rgba(200, 208, 247, 0.8);
  font-size: 1.5rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.1s ease, transform 0.1s ease, border-color 0.1s ease;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
  user-select: none;
  -webkit-user-select: none;
}

.ctrl-btn:active {
  background: rgba(77, 201, 246, 0.2);
  border-color: rgba(77, 201, 246, 0.6);
  transform: scale(0.92);
}

.ctrl-pulse {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  font-size: 1.8rem;
  border-color: rgba(180, 77, 255, 0.4);
}

.ctrl-pulse:active {
  background: rgba(180, 77, 255, 0.25);
  border-color: rgba(180, 77, 255, 0.7);
}

@media (pointer: coarse) {
  .mobile-controls {
    display: flex;
  }
}

/* Achievements panel */
.achievements-panel {
  text-align: center;
}

.achievements-toggle {
  border: 1px solid rgba(77, 201, 246, 0.2);
  border-radius: 999px;
  padding: 8px 20px;
  background: rgba(8, 6, 24, 0.6);
  color: rgba(200, 208, 247, 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(77, 201, 246, 0.08);
  border-color: rgba(77, 201, 246, 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(77, 201, 246, 0.1);
  background: rgba(8, 6, 24, 0.5);
  color: rgba(200, 208, 247, 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 */
.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(8, 6, 24, 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, 208, 247, 0.7);
  font-size: 0.78rem;
}

/* Tutorial overlay */
.tutorial-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.85);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 2000;
  backdrop-filter: blur(4px);
}

.tutorial-overlay.active {
  display: flex;
}

.tutorial-card {
  background: rgba(8, 6, 24, 0.95);
  border: 2px solid rgba(77, 201, 246, 0.3);
  border-radius: 20px;
  padding: 32px 28px;
  max-width: 380px;
  width: 90%;
  text-align: center;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.7), 0 0 40px rgba(77, 201, 246, 0.05);
}

.tutorial-card h2 {
  font-size: 1.6rem;
  margin-bottom: 8px;
  background: linear-gradient(90deg, #4dc9f6, #b44dff);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.tutorial-card p {
  color: rgba(200, 208, 247, 0.75);
  font-size: 0.95rem;
  line-height: 1.5;
  margin-bottom: 16px;
}

.tutorial-visual {
  height: 80px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  margin-bottom: 16px;
}

.tutorial-dots {
  display: flex;
  gap: 8px;
  justify-content: center;
  margin-bottom: 16px;
}

.tutorial-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: rgba(77, 201, 246, 0.2);
  transition: background 0.3s ease;
}

.tutorial-dot.active {
  background: #4dc9f6;
}

.tutorial-btn {
  border: none;
  border-radius: 999px;
  padding: 12px 32px;
  background: linear-gradient(135deg, #4dc9f6, #b44dff);
  color: #ffffff;
  font-weight: 700;
  font-size: 1rem;
  cursor: pointer;
  font-family: inherit;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
  box-shadow: 0 4px 15px rgba(77, 201, 246, 0.25);
}

.tutorial-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(77, 201, 246, 0.35);
}

.tutorial-skip {
  display: block;
  margin: 12px auto 0;
  border: none;
  background: none;
  color: rgba(200, 208, 247, 0.4);
  font-size: 0.82rem;
  cursor: pointer;
  font-family: inherit;
  transition: color 0.2s ease;
}

.tutorial-skip:hover {
  color: rgba(200, 208, 247, 0.7);
}

.game__footer p {
  color: rgba(200, 208, 247, 0.4);
  font-size: 0.88rem;
  font-style: italic;
}

/* Fullscreen styles */
.game:fullscreen,
.game:-webkit-full-screen {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: #04030a;
  padding: 16px;
}

/* --- Mobile portrait: fill viewport --- */
@media (max-width: 600px) {
  html, body {
    height: 100dvh;
    height: 100vh;
    overflow: hidden;
  }

  body {
    padding: 8px 6px;
    align-items: stretch;
  }

  .game {
    max-width: 100%;
    height: 100%;
    grid-template-rows: auto auto auto;
    gap: 6px;
  }

  .game__header {
    padding: 0 4px;
  }

  .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;
    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;
    min-height: 44px;
  }

  .hud__mute {
    min-width: 44px;
    min-height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
  }

  .settings-bar {
    gap: 8px;
  }

  .setting-group {
    font-size: 0.75rem;
  }

  .mobile-controls {
    gap: 10px;
  }

  .ctrl-btn {
    width: 54px;
    height: 54px;
    font-size: 1.3rem;
  }

  .ctrl-pulse {
    width: 62px;
    height: 62px;
    font-size: 1.5rem;
  }

  .achievements-panel {
    display: none;
  }

  .game__footer {
    display: none;
  }
}

/* --- Very short phones --- */
@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;
  }

  .ctrl-btn {
    width: 48px;
    height: 48px;
  }

  .ctrl-pulse {
    width: 54px;
    height: 54px;
  }

  .hud__score strong {
    font-size: 1.1rem;
  }
}

@media (max-width: 380px) {
  body {
    padding: 4px 4px;
  }

  .game__panel {
    padding: 6px;
  }

  .game__header h1 {
    font-size: 1.2rem;
  }
}

@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;
  }
}

/* Prevent pull-to-refresh and overscroll on mobile */
html, body {
  overscroll-behavior: none;
  -webkit-overflow-scrolling: auto;
}

/* Safe area insets for notched phones */
@supports (padding-bottom: env(safe-area-inset-bottom)) {
  body {
    padding-bottom: calc(12px + env(safe-area-inset-bottom));
    padding-left: calc(8px + env(safe-area-inset-left));
    padding-right: calc(8px + env(safe-area-inset-right));
  }
}