/* ==========================================================================
   FS MAGNET SORT - STYLESHEET (Modular, Responsive & Glassmorphism)
   ========================================================================== */

:root {
  --font-heading: 'Outfit', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-body: 'Prompt', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  
  --bg-dark: #040710;
  --bg-card: rgba(12, 18, 34, 0.82);
  --border-glass: rgba(255, 255, 255, 0.12);
  --border-active: rgba(0, 243, 255, 0.45);
  
  --text-main: #f0f4fc;
  --text-muted: #8ca0be;
  
  --color-red: #ff3366;
  --color-blue: #0077ff;
  --color-gold: #ffd700;
  --color-green: #00e626;
  --color-purple: #b000ff;
  
  --shadow-card: 0 12px 32px rgba(0, 0, 0, 0.6);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  user-select: none;
  -webkit-user-select: none;
  -webkit-touch-callout: none;
}

body {
  font-family: var(--font-body);
  background: radial-gradient(circle at 50% 20%, #0d172e 0%, #03060c 100%);
  color: var(--text-main);
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding: 12px 10px 24px;
  overflow-x: hidden;
}

.game-container {
  width: 100%;
  max-width: 680px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

/* ==========================================================================
   Top Header & Navigation
   ========================================================================== */
.game-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
  background: var(--bg-card);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--border-glass);
  border-radius: 16px;
  padding: 8px 12px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
}

.back-btn {
  text-decoration: none;
  color: var(--text-main);
  font-size: 0.82rem;
  font-weight: 600;
  padding: 6px 12px;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border-glass);
  transition: all 0.2s ease;
  white-space: nowrap;
}

.back-btn:hover {
  background: rgba(0, 243, 255, 0.15);
  border-color: var(--color-blue);
  transform: translateX(-2px);
}

.header-title {
  display: flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: 0.5px;
  background: linear-gradient(135deg, #ffffff 30%, var(--color-blue) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  white-space: nowrap;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 6px;
}

.glass-btn {
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid var(--border-glass);
  color: var(--text-main);
  border-radius: 10px;
  font-family: var(--font-body);
  cursor: pointer;
  transition: all 0.2s ease;
}

.glass-btn:hover {
  background: rgba(255, 255, 255, 0.15);
  border-color: var(--color-blue);
}

.icon-btn {
  padding: 6px 9px;
  font-size: 0.88rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.mode-toggle-btn {
  font-size: 0.78rem;
  font-weight: 600;
  padding: 6px 10px;
  border-color: rgba(0, 243, 255, 0.3);
  color: var(--color-blue);
}

.donate-btn {
  padding: 6px 10px;
  font-size: 0.76rem;
  font-weight: 600;
  background: linear-gradient(135deg, rgba(255, 215, 0, 0.15), rgba(255, 140, 0, 0.15));
  border-color: rgba(255, 215, 0, 0.4);
  color: #ffd700;
  white-space: nowrap;
}

.donate-btn:hover {
  background: linear-gradient(135deg, rgba(255, 215, 0, 0.3), rgba(255, 140, 0, 0.3));
  box-shadow: 0 0 12px rgba(255, 215, 0, 0.35);
}

/* ==========================================================================
   Stats Bar
   ========================================================================== */
.stats-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 6px;
}

.stat-badge {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border-glass);
  border-radius: 12px;
  padding: 5px 6px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-width: 0;
}

.stat-label {
  font-family: var(--font-heading);
  font-size: 0.62rem;
  font-weight: 600;
  color: var(--text-muted);
  letter-spacing: 0.3px;
  text-transform: uppercase;
}

.stat-value {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-blue);
  line-height: 1.2;
}

.stat-badge.highlight .stat-value {
  color: var(--color-gold);
}

.stat-badge.combo-badge .stat-value {
  color: var(--color-red);
}

/* ==========================================================================
   Three.js Canvas Wrapper
   ========================================================================== */
.canvas-wrapper {
  position: relative;
  width: 100%;
  aspect-ratio: 4 / 3;
  max-height: calc(100dvh - 210px);
  background: #060912;
  border: 1px solid rgba(0, 243, 255, 0.28);
  border-radius: 18px;
  overflow: hidden;
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.7), inset 0 0 32px rgba(0, 243, 255, 0.06);
  touch-action: none;
}

#webgl-canvas {
  width: 100%;
  height: 100%;
  display: block;
  cursor: grab;
  touch-action: none;
}

#webgl-canvas:active {
  cursor: grabbing;
}

/* On-screen floating HUD notice */
.canvas-hud-hint {
  position: absolute;
  top: 10px;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(6, 10, 20, 0.75);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 20px;
  padding: 4px 14px;
  font-size: 0.75rem;
  color: var(--text-muted);
  pointer-events: none;
  white-space: nowrap;
  transition: opacity 0.3s ease;
  z-index: 5;
}

/* ==========================================================================
   Wand Polarity / Color Selector Dock
   ========================================================================== */
.polarity-dock {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border-glass);
  border-radius: 16px;
  padding: 6px 10px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
}

.polarity-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-weight: 600;
  margin-right: 4px;
}

.color-btn {
  flex: 1;
  max-width: 130px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 8px 10px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.12);
  color: var(--text-main);
  font-family: var(--font-body);
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.2, 0.8, 0.2, 1);
}

.color-indicator {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  box-shadow: 0 0 8px currentColor;
}

.hotkey-badge {
  font-size: 0.62rem;
  font-family: var(--font-heading);
  background: rgba(255, 255, 255, 0.12);
  padding: 1px 5px;
  border-radius: 4px;
  color: var(--text-muted);
}

/* Polarity Color States */
.color-btn[data-color="red"] .color-indicator { background: var(--color-red); color: var(--color-red); }
.color-btn[data-color="blue"] .color-indicator { background: var(--color-blue); color: var(--color-blue); }
.color-btn[data-color="gold"] .color-indicator { background: var(--color-gold); color: var(--color-gold); }
.color-btn[data-color="green"] .color-indicator { background: var(--color-green); color: var(--color-green); }

.color-btn.active[data-color="red"] {
  border-color: var(--color-red);
  background: rgba(255, 51, 102, 0.2);
  box-shadow: 0 0 16px rgba(255, 51, 102, 0.4);
  transform: translateY(-2px);
}
.color-btn.active[data-color="blue"] {
  border-color: var(--color-blue);
  background: rgba(0, 119, 255, 0.22);
  box-shadow: 0 0 16px rgba(0, 119, 255, 0.45);
  transform: translateY(-2px);
}
.color-btn.active[data-color="gold"] {
  border-color: var(--color-gold);
  background: rgba(255, 215, 0, 0.2);
  box-shadow: 0 0 16px rgba(255, 215, 0, 0.4);
  transform: translateY(-2px);
}
.color-btn.active[data-color="green"] {
  border-color: var(--color-green);
  background: rgba(0, 230, 38, 0.22);
  box-shadow: 0 0 16px rgba(0, 230, 38, 0.45);
  transform: translateY(-2px);
}

/* ==========================================================================
   Overlay Displays (Start, Pause, Stage Complete)
   ========================================================================== */
.canvas-overlay {
  position: absolute;
  inset: 0;
  background: rgba(4, 8, 16, 0.88);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 12px;
  z-index: 10;
  transition: opacity 0.25s ease;
  overflow-y: auto;
}

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

.overlay-card {
  text-align: center;
  padding: 20px 18px;
  max-width: 440px;
  width: 100%;
  max-height: 96%;
  overflow-y: auto;
  background: rgba(14, 22, 42, 0.94);
  border: 1px solid var(--border-glass);
  border-radius: 18px;
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.8);
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.glow-title {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  color: var(--color-blue);
  text-shadow: 0 0 16px rgba(0, 243, 255, 0.5);
  margin-bottom: 4px;
}

.subtitle {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.controls-guide {
  display: flex;
  flex-direction: column;
  gap: 8px;
  text-align: left;
  background: rgba(0, 0, 0, 0.35);
  padding: 10px 12px;
  border-radius: 12px;
  margin-bottom: 14px;
}

.guide-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.76rem;
  line-height: 1.3;
}

.key-badge {
  background: rgba(0, 243, 255, 0.15);
  color: var(--color-blue);
  border: 1px solid rgba(0, 243, 255, 0.4);
  padding: 2px 6px;
  border-radius: 6px;
  font-size: 0.66rem;
  font-family: var(--font-heading);
  font-weight: 700;
  white-space: nowrap;
}

.key-icon {
  font-size: 0.95rem;
}

.guide-text {
  color: #cfd9ed;
}

.primary-btn {
  background: linear-gradient(135deg, var(--color-blue), #0077b6);
  color: #030812;
  border: none;
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 700;
  padding: 10px 24px;
  border-radius: 12px;
  cursor: pointer;
  transition: all 0.2s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.primary-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 243, 255, 0.4);
}

.secondary-btn {
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid var(--border-glass);
  color: var(--text-main);
  font-family: var(--font-body);
  font-size: 0.88rem;
  font-weight: 600;
  padding: 8px 18px;
  border-radius: 12px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.secondary-btn:hover {
  background: rgba(255, 255, 255, 0.18);
  border-color: var(--color-blue);
}

.overlay-actions {
  display: flex;
  gap: 8px;
  justify-content: center;
}

/* ==========================================================================
   Footer Hint
   ========================================================================== */
.controls-footer {
  text-align: center;
  padding: 4px;
  font-size: 0.74rem;
  color: var(--text-muted);
  line-height: 1.35;
}

/* ==========================================================================
   Responsive Adjustments (Mobile & Small Screens)
   ========================================================================== */
@media (max-width: 600px) {
  body {
    padding: 8px 6px 16px;
    align-items: flex-start;
  }

  .game-container {
    gap: 7px;
  }

  .game-header {
    padding: 7px 10px;
    border-radius: 14px;
  }

  .header-title {
    font-size: 1rem;
  }

  .back-btn {
    font-size: 0.78rem;
    padding: 5px 9px;
  }

  .mode-toggle-btn {
    font-size: 0.72rem;
    padding: 5px 8px;
  }

  .donate-btn {
    font-size: 0.72rem;
    padding: 5px 8px;
  }

  .stat-badge {
    padding: 4px 2px;
    border-radius: 10px;
  }

  .stat-label {
    font-size: 0.56rem;
  }

  .stat-value {
    font-size: 0.92rem;
  }

  .canvas-wrapper {
    aspect-ratio: 1 / 1;
    border-radius: 14px;
    max-height: min(100%, calc(100dvh - 210px));
  }

  .polarity-dock {
    padding: 6px 6px;
    border-radius: 14px;
    gap: 5px;
  }

  .polarity-label {
    display: none;
  }

  .color-btn {
    padding: 6px 4px;
    font-size: 0.74rem;
    gap: 4px;
  }

  .color-indicator {
    width: 10px;
    height: 10px;
  }

  .hotkey-badge {
    display: none;
  }

  .overlay-card {
    padding: 14px 12px;
  }

  .glow-title {
    font-size: 1.25rem;
  }

  .subtitle {
    font-size: 0.72rem;
    margin-bottom: 8px;
  }

  .controls-guide {
    padding: 8px;
    gap: 6px;
    margin-bottom: 10px;
  }

  .guide-item {
    font-size: 0.7rem;
    gap: 6px;
  }

  .primary-btn {
    padding: 8px 18px;
    font-size: 0.88rem;
  }
}

/* Extra Small Screens (<= 360px) */
@media (max-width: 360px) {
  body {
    padding: 4px 4px 12px;
  }

  .game-container {
    gap: 5px;
  }

  .game-header {
    padding: 6px 6px;
  }

  .header-title {
    font-size: 0.9rem;
  }

  .back-btn {
    font-size: 0.72rem;
    padding: 4px 7px;
  }

  .stat-label {
    font-size: 0.52rem;
  }

  .stat-value {
    font-size: 0.82rem;
  }

  .color-btn {
    padding: 5px 2px;
    font-size: 0.68rem;
  }
}