/* ============================================
   Antigravity — 2D Platformer  |  Premium Styles
   ============================================ */

*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

:root {
  --bg-dark: #080b14;
  --bg-card: #0e1225;
  --accent: #7f5af0;
  --accent-glow: rgba(127, 90, 240, .55);
  --accent2: #2cb67d;
  --accent2-glow: rgba(44, 182, 125, .45);
  --accent3: #e53170;
  --gold: #f7cb46;
  --text: #fffffe;
  --text-dim: #8892a8;
  --surface: rgba(255, 255, 255, .06);
  --glass: rgba(15, 20, 40, .75);
  --glass-border: rgba(255, 255, 255, .1);
  --font: 'Outfit', sans-serif;
  --mono: 'JetBrains Mono', monospace;
  --radius: 16px;
  --radius-sm: 10px;
}

html,
body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: var(--bg-dark);
  font-family: var(--font);
  color: var(--text);
  user-select: none;
  -webkit-user-select: none;
  touch-action: none;
}

/* ========== Canvas ========== */
#game-canvas {
  display: block;
  width: 100vw;
  height: 100vh;
  background: var(--bg-dark);
  image-rendering: pixelated;
}

/* ========== Overlays ========== */
.overlay {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  background: radial-gradient(ellipse at 50% 30%, rgba(127, 90, 240, .15) 0%, var(--bg-dark) 70%);
  transition: opacity .45s cubic-bezier(.4, 0, .2, 1);
}

.overlay.hidden {
  opacity: 0;
  pointer-events: none;
  visibility: hidden;
  transition: opacity .45s cubic-bezier(.4, 0, .2, 1), visibility 0s linear .45s;
}

.overlay-content {
  position: relative;
  z-index: 2;
  text-align: center;
  padding: 2.5rem 3.5rem;
  border-radius: 24px;
  background: var(--glass);
  backdrop-filter: blur(30px) saturate(1.4);
  -webkit-backdrop-filter: blur(30px) saturate(1.4);
  border: 1px solid var(--glass-border);
  box-shadow:
    0 8px 60px rgba(0, 0, 0, .6),
    inset 0 1px 0 rgba(255, 255, 255, .05);
  animation: fadeUp .5s cubic-bezier(.22, 1, .36, 1) forwards;
  max-width: 520px;
  width: 90vw;
  transition: transform .1s ease-out;
}

.start-content {
  max-width: 560px;
}

@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(24px) scale(.97);
  }

  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

/* ===== Logo ===== */
.logo-wrapper {
  position: relative;
  display: inline-block;
  margin-bottom: .2rem;
}

.logo-glow {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 280px;
  height: 80px;
  background: radial-gradient(ellipse, var(--accent-glow) 0%, transparent 70%);
  filter: blur(30px);
  animation: pulseGlow 3s ease-in-out infinite;
}

@keyframes pulseGlow {

  0%,
  100% {
    opacity: .5;
    transform: translate(-50%, -50%) scale(1);
  }

  50% {
    opacity: .8;
    transform: translate(-50%, -50%) scale(1.15);
  }
}

.game-title {
  position: relative;
  font-size: 3.4rem;
  font-weight: 900;
  letter-spacing: 5px;
  background: linear-gradient(135deg, var(--accent), #a78bfa, var(--accent2));
  background-size: 200% 200%;
  animation: gradientShift 4s ease infinite;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  filter: drop-shadow(0 0 20px var(--accent-glow));
  margin-bottom: .3rem;
}

@keyframes gradientShift {

  0%,
  100% {
    background-position: 0% 50%;
  }

  50% {
    background-position: 100% 50%;
  }
}

.gameover-title {
  background: linear-gradient(135deg, #e53170, #ff6f3c, #e53170);
  background-size: 200% 200%;
  animation: gradientShift 3s ease infinite;
  -webkit-background-clip: text;
  background-clip: text;
}

.win-title {
  background: linear-gradient(135deg, var(--gold), var(--accent2), var(--gold));
  background-size: 200% 200%;
  animation: gradientShift 3s ease infinite;
  -webkit-background-clip: text;
  background-clip: text;
}

.pause-title {
  font-size: 2.6rem;
  background: linear-gradient(135deg, var(--text-dim), var(--text));
  -webkit-background-clip: text;
  background-clip: text;
}

.subtitle {
  font-size: 1.05rem;
  color: var(--text-dim);
  margin-bottom: 1.6rem;
}

.tagline {
  font-weight: 400;
  letter-spacing: 3px;
  text-transform: uppercase;
  font-size: .85rem;
  color: var(--text-dim);
  margin-bottom: 2rem;
}

/* ===== Controls info ===== */
.controls-info {
  display: flex;
  gap: 1.6rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 1.8rem;
}

.control-group {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: .4rem;
}

.control-label {
  font-size: .72rem;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--text-dim);
}

.key-row {
  display: flex;
  gap: 4px;
  font-size: .9rem;
  color: var(--text-dim);
}

kbd {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 4px 10px;
  min-width: 32px;
  background: rgba(255, 255, 255, .06);
  border: 1px solid rgba(255, 255, 255, .12);
  border-bottom: 2px solid rgba(255, 255, 255, .15);
  border-radius: 7px;
  font-family: var(--mono);
  font-size: .78rem;
  color: var(--text);
  transition: background .15s;
}

/* ===== Features badges ===== */
.features-list {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  justify-content: center;
  margin-bottom: 2rem;
}

.feature-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 5px 12px;
  font-size: .75rem;
  background: var(--surface);
  border: 1px solid var(--glass-border);
  border-radius: 20px;
  color: var(--text-dim);
}

/* ===== Buttons ===== */
.btn-glow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 44px;
  font-size: 1.1rem;
  font-weight: 700;
  font-family: var(--font);
  letter-spacing: 1.5px;
  color: var(--text);
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  box-shadow: 0 4px 24px var(--accent-glow), 0 2px 40px var(--accent2-glow);
  transition: transform .16s ease, box-shadow .22s ease;
  position: relative;
  overflow: hidden;
}

.btn-glow::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(105deg, transparent 40%, rgba(255, 255, 255, .15) 50%, transparent 60%);
  transform: translateX(-100%);
  transition: transform .5s;
}

.btn-glow:hover::after {
  transform: translateX(100%);
}

.btn-glow:hover {
  transform: translateY(-2px) scale(1.03);
  box-shadow: 0 6px 32px var(--accent-glow), 0 4px 50px var(--accent2-glow);
}

.btn-glow:active {
  transform: scale(.97);
}

.btn-outline {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 36px;
  font-size: 1rem;
  font-weight: 600;
  font-family: var(--font);
  letter-spacing: 1px;
  color: var(--text-dim);
  background: transparent;
  border: 1.5px solid var(--glass-border);
  border-radius: var(--radius);
  cursor: pointer;
  transition: all .2s ease;
}

.btn-outline:hover {
  border-color: var(--accent);
  color: var(--text);
  background: rgba(127, 90, 240, .1);
}

.btn-group {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 1rem;
}

/* ========== HUD ========== */
#hud {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 50;
  display: none;
  justify-content: space-between;
  align-items: flex-start;
  padding: 14px 20px;
  background: linear-gradient(180deg, rgba(8, 11, 20, .85) 0%, transparent 100%);
  pointer-events: none;
}

#hud.active {
  display: flex;
}

.hud-left,
.hud-right,
.hud-center {
  display: flex;
  align-items: center;
  gap: .8rem;
}

.hud-center {
  flex-direction: column;
  gap: .25rem;
}

.hud-item {
  display: flex;
  align-items: center;
  gap: 5px;
  font-size: 1rem;
  font-weight: 600;
}

.hud-icon {
  font-size: 1.15rem;
}

.hud-coins {
  background: var(--glass);
  border: 1px solid var(--glass-border);
  padding: 6px 14px;
  border-radius: var(--radius-sm);
}

.coin-pulse {
  animation: coinPulse .3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

@keyframes coinPulse {
  0% {
    transform: scale(1);
  }

  50% {
    transform: scale(1.15);
    border-color: var(--gold);
    box-shadow: 0 0 15px rgba(247, 203, 70, .5);
  }

  100% {
    transform: scale(1);
    border-color: var(--glass-border);
    box-shadow: none;
  }
}

.hud-score {
  background: var(--glass);
  border: 1px solid var(--glass-border);
  padding: 6px 14px;
  border-radius: var(--radius-sm);
}

.hud-timer {
  font-family: var(--mono);
  font-size: .85rem;
  color: var(--text-dim);
}

.hearts-row {
  display: flex;
  gap: 4px;
}

.heart {
  font-size: 1.3rem;
  transition: transform .2s, opacity .2s;
}

.heart.lost {
  opacity: .2;
  transform: scale(.7);
  filter: grayscale(1);
}

#level-label {
  font-size: .8rem;
  text-transform: uppercase;
  letter-spacing: 3px;
  color: var(--text-dim);
}

/* ========== Powerup Indicator ========== */
#powerup-indicator {
  position: fixed;
  bottom: 80px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 50;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 20px;
  background: var(--glass);
  border: 1px solid var(--accent);
  border-radius: var(--radius-sm);
  font-size: .9rem;
  font-weight: 600;
  animation: slideUpPowerup .4s ease;
  box-shadow: 0 0 20px var(--accent-glow);
}

#powerup-indicator.hidden {
  display: none;
}

@keyframes slideUpPowerup {
  from {
    opacity: 0;
    transform: translateX(-50%) translateY(20px);
  }

  to {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
  }
}

/* ========== Level Transition ========== */
#level-transition {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-dark);
  clip-path: circle(150% at 50% 50%);
  transition: clip-path .8s cubic-bezier(.77, 0, .175, 1);
}

#level-transition.hidden {
  clip-path: circle(0% at 50% 50%);
  pointer-events: none;
}

.transition-content {
  text-align: center;
  animation: zoomIn .5s ease;
}

.transition-content h2 {
  font-size: 3rem;
  font-weight: 900;
  letter-spacing: 6px;
  color: var(--accent);
  text-shadow: 0 0 40px var(--accent-glow);
  margin-bottom: .5rem;
}

.transition-content p {
  font-size: 1.1rem;
  color: var(--text-dim);
}

@keyframes zoomIn {
  from {
    opacity: 0;
    transform: scale(.7);
  }

  to {
    opacity: 1;
    transform: scale(1);
  }
}

/* ===== Stats ===== */
.final-stats,
.pause-stats {
  display: flex;
  flex-direction: column;
  gap: .5rem;
  margin: 1.2rem 0;
  padding: 1rem;
  background: var(--surface);
  border-radius: var(--radius-sm);
}

.stat-item {
  font-size: .95rem;
  color: var(--text-dim);
}

.stat-item span {
  color: var(--text);
  font-weight: 700;
}

/* ===== Star Rating ===== */
.star-rating {
  font-size: 2.2rem;
  margin: .8rem 0 1.2rem;
  display: flex;
  justify-content: center;
  gap: .5rem;
}

.star-rating .star {
  opacity: .2;
  transform: scale(.8);
  transition: all .3s ease;
  filter: grayscale(1);
}

.star-rating .star.earned {
  opacity: 1;
  transform: scale(1);
  filter: none;
  animation: starBounce .4s ease;
}

@keyframes starBounce {
  0% {
    transform: scale(0);
  }

  60% {
    transform: scale(1.3);
  }

  100% {
    transform: scale(1);
  }
}

/* ========== Background particles (start screen) ========== */
.particles-bg {
  position: absolute;
  inset: 0;
  z-index: 1;
  overflow: hidden;
}

.particle {
  position: absolute;
  border-radius: 50%;
  background: var(--accent);
  opacity: .2;
  animation: floatUp linear infinite;
}

@keyframes floatUp {
  0% {
    transform: translateY(0) scale(1);
    opacity: .2;
  }

  50% {
    opacity: .35;
  }

  100% {
    transform: translateY(-110vh) scale(.4);
    opacity: 0;
  }
}

/* ========== Mobile Controls ========== */
#mobile-controls {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 60;
  padding: 16px 20px 28px;
  justify-content: space-between;
  align-items: flex-end;
  pointer-events: none;
}

#mobile-controls.active {
  display: flex;
}

.mobile-dpad,
.mobile-actions {
  display: flex;
  gap: 10px;
  pointer-events: auto;
}

.dpad-btn,
.action-btn {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  border: 2px solid rgba(255, 255, 255, .15);
  background: rgba(255, 255, 255, .08);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  color: rgba(255, 255, 255, .6);
  font-size: 1.4rem;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all .1s ease;
  touch-action: none;
}

.dpad-btn:active,
.action-btn:active,
.dpad-btn.pressed,
.action-btn.pressed {
  background: rgba(127, 90, 240, .35);
  border-color: var(--accent);
  color: var(--text);
  transform: scale(.92);
}

.action-jump {
  width: 76px;
  height: 76px;
  font-size: 1.6rem;
  border-color: rgba(44, 182, 125, .3);
}

.action-jump:active,
.action-jump.pressed {
  background: rgba(44, 182, 125, .3);
  border-color: var(--accent2);
}

/* ========== Responsive ========== */
@media (max-width: 700px) {
  .game-title {
    font-size: 2.2rem;
    letter-spacing: 3px;
  }

  .overlay-content {
    padding: 1.8rem 1.4rem;
  }

  .btn-glow {
    padding: 12px 32px;
    font-size: .95rem;
  }

  .controls-info {
    gap: .8rem;
  }

  .control-label {
    font-size: .65rem;
  }

  kbd {
    padding: 3px 7px;
    font-size: .7rem;
    min-width: 26px;
  }

  #hud {
    padding: 10px 12px;
  }

  .hud-coins,
  .hud-score {
    padding: 4px 10px;
    font-size: .85rem;
  }

  .features-list {
    gap: .35rem;
  }

  .feature-badge {
    font-size: .65rem;
    padding: 3px 8px;
  }
}

@media (max-width: 480px) {
  .game-title {
    font-size: 1.7rem;
  }

  .controls-info {
    display: none;
  }

  .tagline {
    margin-bottom: 1.2rem;
  }
}