/* ==========================================================================
   Rubik's 3D - Main Stylesheet
   ========================================================================== */

:root {
  --bg-primary: #0f111a;
  --bg-secondary: #181b2a;
  --bg-glass: rgba(24, 27, 42, 0.78);
  --bg-glass-card: rgba(30, 34, 53, 0.65);
  --bg-glass-hover: rgba(45, 52, 78, 0.8);
  --border-glass: rgba(255, 255, 255, 0.08);
  --border-active: rgba(0, 229, 255, 0.4);
  
  --text-main: #f0f4fc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  
  --accent-cyan: #00f0ff;
  --accent-blue: #3b82f6;
  --accent-purple: #8b5cf6;
  --accent-green: #10b981;
  --accent-yellow: #f59e0b;
  --accent-red: #ef4444;
  --accent-orange: #f97316;

  /* Rubik's Standard Sticker Colors */
  --rubik-white: #ffffff;
  --rubik-yellow: #ffd500;
  --rubik-green: #009b48;
  --rubik-blue: #0046ad;
  --rubik-red: #b71234;
  --rubik-orange: #ff5800;
  --rubik-plastic: #111215;

  --shadow-main: 0 16px 40px rgba(0, 0, 0, 0.45);
  --shadow-glow: 0 0 20px rgba(0, 240, 255, 0.25);
  --shadow-pill: 0 4px 12px rgba(0, 0, 0, 0.25);
  
  --font-family: 'Outfit', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-full: 9999px;
  
  --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="light"] {
  --bg-primary: #f1f5f9;
  --bg-secondary: #ffffff;
  --bg-glass: rgba(255, 255, 255, 0.85);
  --bg-glass-card: rgba(248, 250, 252, 0.9);
  --border-glass: rgba(0, 0, 0, 0.08);
  --text-main: #0f172a;
  --text-muted: #64748b;
  --text-dim: #94a3b8;
  --rubik-plastic: #2a2d34;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

#app-container {
  display: flex;
  flex-direction: column;
  width: 100vw;
  height: 100vh;
  position: relative;
  background: radial-gradient(circle at 50% 30%, #171b2d 0%, var(--bg-primary) 70%);
}

/* ==========================================================================
   OneWordly Master Suite Header
   ========================================================================== */

.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 24px;
  background-color: #0b0e14;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  flex-shrink: 0;
  z-index: 120;
}

.logo-group {
  display: flex;
  align-items: center;
  gap: 12px;
  cursor: pointer;
  user-select: none;
  text-decoration: none;
  transition: opacity 0.15s ease, transform 0.15s ease;
}

.logo-group:hover {
  opacity: 0.88;
  transform: translateY(-1px);
}

.logo-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  background: linear-gradient(135deg, #3b82f6, #ec4899);
  color: #fff;
  border-radius: 9px;
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

.logo-text {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.logo-title {
  font-size: 1.2rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: #f0f4fc;
}

.logo-badge {
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 2px 8px;
  border-radius: 9999px;
  background-color: rgba(255, 255, 255, 0.06);
  color: #94a3b8;
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.header-mode-nav {
  display: flex;
  align-items: center;
  background-color: #111520;
  padding: 3px;
  border-radius: 10px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  gap: 3px;
}

.mode-tab {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  font-family: inherit;
  font-size: 0.8rem;
  font-weight: 600;
  border-radius: 7px;
  border: none;
  background: transparent;
  color: #94a3b8;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.15s ease;
  white-space: nowrap;
}

.mode-tab:hover {
  color: #f0f4fc;
}

.mode-tab.active {
  background-color: #1e2436;
  color: #f0f4fc;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.25);
}

.tab-label-short {
  display: none;
}

@media (max-width: 768px) {
  .app-header {
    padding: 8px 12px;
  }
  .logo-badge {
    display: none;
  }
  .tab-label-full {
    display: none;
  }
  .tab-label-short {
    display: inline;
  }
  .mode-tab {
    padding: 5px 7px;
    gap: 3px;
    font-size: 0.72rem;
  }
  .top-nav {
    padding: 0.4rem 0.6rem;
  }
  .top-nav .logo-area {
    display: none;
  }
  .mode-btn {
    padding: 6px 10px;
    font-size: 0.75rem;
  }
}

/* ==========================================================================
   Module Navigation Sub-Header
   ========================================================================== */

.top-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1.5rem;
  background: var(--bg-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-glass);
  z-index: 100;
  flex-shrink: 0;
}

.logo-area {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.cube-icon-badge {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, #00f0ff 0%, #3b82f6 50%, #8b5cf6 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  color: #ffffff;
  box-shadow: 0 0 15px rgba(0, 240, 255, 0.35);
}

.logo-text h1 {
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: 0.5px;
  line-height: 1.1;
}

.accent-text {
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.tagline {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-weight: 500;
}

/* Mode Tabs */
.mode-tabs {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  background: rgba(0, 0, 0, 0.25);
  padding: 0.3rem;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-glass);
}

.mode-btn {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.45rem 1.1rem;
  border-radius: var(--radius-full);
  border: none;
  background: transparent;
  color: var(--text-muted);
  font-family: var(--font-family);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.mode-btn i {
  font-size: 1.1rem;
}

.mode-btn:hover {
  color: var(--text-main);
  background: rgba(255, 255, 255, 0.05);
}

.mode-btn.active {
  background: linear-gradient(135deg, rgba(0, 240, 255, 0.2), rgba(59, 130, 246, 0.3));
  color: var(--accent-cyan);
  border: 1px solid var(--border-active);
  box-shadow: var(--shadow-glow);
}

.top-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.icon-btn {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-glass);
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.icon-btn:hover {
  color: var(--text-main);
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.2);
}

/* ==========================================================================
   Main Stage Layout (3D Viewport + Sidebar Overlay)
   ========================================================================== */

.main-stage {
  flex: 1;
  display: flex;
  position: relative;
  overflow: hidden;
  height: calc(100vh - 65px);
}

/* 3D Canvas Area */
#canvas-container {
  flex: 1;
  height: 100%;
  position: relative;
  overflow: hidden;
  outline: none;
  cursor: grab;
}

#canvas-container canvas {
  width: 100% !important;
  height: 100% !important;
  display: block;
  position: absolute;
  top: 0;
  left: 0;
}

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

/* Viewport Hint */
.viewport-hint {
  position: absolute;
  top: 1.25rem;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(15, 17, 26, 0.75);
  backdrop-filter: blur(10px);
  border: 1px solid var(--border-glass);
  padding: 0.4rem 1rem;
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  pointer-events: none;
  z-index: 10;
  transition: opacity 0.5s ease;
}

/* Selected Sticker Badge */
.selected-sticker-badge {
  position: absolute;
  top: 3.5rem;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, rgba(0, 240, 255, 0.2), rgba(59, 130, 246, 0.25));
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--accent-cyan);
  box-shadow: 0 0 20px rgba(0, 240, 255, 0.35);
  padding: 0.45rem 1rem;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 600;
  color: #ffffff;
  display: flex;
  align-items: center;
  gap: 0.65rem;
  z-index: 25;
  animation: badge-pulse 2s infinite ease-in-out;
}

@keyframes badge-pulse {
  0%, 100% { box-shadow: 0 0 10px rgba(0, 240, 255, 0.25); }
  50% { box-shadow: 0 0 22px rgba(0, 240, 255, 0.5); }
}

.badge-icon {
  display: flex;
  align-items: center;
  color: var(--accent-cyan);
  font-size: 1.1rem;
}

.badge-close-btn {
  background: transparent;
  border: none;
  color: rgba(255, 255, 255, 0.7);
  font-size: 1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2px;
  border-radius: 50%;
  transition: all var(--transition-fast);
}

.badge-close-btn:hover {
  color: #ffffff;
  background: rgba(255, 255, 255, 0.2);
}

/* Orientation Compass Badge */
.cube-orientation-badge {
  position: absolute;
  top: 1.25rem;
  left: 1.25rem;
  background: rgba(24, 27, 42, 0.85);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  padding: 0.6rem 0.85rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  font-size: 0.75rem;
  font-family: var(--font-mono);
  z-index: 10;
  box-shadow: var(--shadow-pill);
}

.orient-item {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  color: var(--text-muted);
}

.orient-item .label {
  width: 40px;
  font-weight: 600;
  color: var(--text-dim);
}

.color-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.4);
}

.color-dot.white { background: var(--rubik-white); }
.color-dot.yellow { background: var(--rubik-yellow); }
.color-dot.green { background: var(--rubik-green); }
.color-dot.blue { background: var(--rubik-blue); }
.color-dot.red { background: var(--rubik-red); }
.color-dot.orange { background: var(--rubik-orange); }

/* Floating Quick Actions (Top Right of Viewport) */
.viewport-quick-actions {
  position: absolute;
  top: 1.5rem;
  right: 1.5rem;
  z-index: 15;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.floating-action-btn,
.floating-square-btn {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(24, 27, 42, 0.85);
  backdrop-filter: blur(14px);
  border: 1px solid rgba(0, 240, 255, 0.35);
  border-radius: var(--radius-full);
  color: var(--accent-cyan);
  font-family: var(--font-family);
  font-size: 0.82rem;
  font-weight: 700;
  padding: 0.55rem 1rem;
  cursor: pointer;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.4), 0 0 10px rgba(0, 240, 255, 0.15);
  transition: all var(--transition-fast);
}

.floating-action-btn:hover,
.floating-square-btn:hover {
  background: rgba(0, 240, 255, 0.2);
  border-color: var(--accent-cyan);
  color: #ffffff;
  box-shadow: 0 4px 20px rgba(0, 240, 255, 0.4);
  transform: translateY(-1px);
}

.floating-action-btn:active,
.floating-square-btn:active {
  transform: translateY(1px);
}

/* Camera Angle Presets Floating Panel */
.camera-presets-panel {
  position: absolute;
  bottom: 1.5rem;
  left: 1.5rem;
  background: rgba(24, 27, 42, 0.85);
  backdrop-filter: blur(14px);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  padding: 0.65rem 0.85rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  z-index: 10;
  box-shadow: var(--shadow-main);
}

.presets-label {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--accent-cyan);
}

.preset-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  max-width: 270px;
}

.preset-btn {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-glass);
  color: var(--text-muted);
  font-family: var(--font-family);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.3rem 0.65rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.preset-btn:hover {
  background: rgba(255, 255, 255, 0.12);
  color: var(--text-main);
}

.preset-btn.active {
  background: var(--accent-cyan);
  color: #000000;
  border-color: var(--accent-cyan);
  font-weight: 700;
}

.preset-reset-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  background: transparent;
  border: 1px dashed var(--border-glass);
  color: var(--text-dim);
  font-size: 0.72rem;
  font-weight: 600;
  padding: 0.3rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.preset-reset-btn:hover {
  color: var(--text-main);
  border-color: rgba(255, 255, 255, 0.3);
  background: rgba(255, 255, 255, 0.05);
}

/* ==========================================================================
   Sidebar & Mode Panels
   ========================================================================== */

.mode-panel {
  display: none;
  width: 440px;
  max-width: 95vw;
  height: 100%;
  padding: 1.25rem 1.25rem 1.25rem 0;
  z-index: 20;
}

.mode-panel.active {
  display: block;
}

.panel-card {
  width: 100%;
  height: 100%;
  background: var(--bg-glass-card);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  overflow-y: auto;
  box-shadow: var(--shadow-main);
}

.panel-card::-webkit-scrollbar {
  width: 6px;
}

.panel-card::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.15);
  border-radius: 3px;
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.panel-header h3 {
  font-size: 1.1rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.status-pill {
  padding: 0.2rem 0.65rem;
  border-radius: var(--radius-full);
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  background: rgba(16, 185, 129, 0.15);
  color: var(--accent-green);
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.status-pill.scrambled {
  background: rgba(245, 158, 11, 0.15);
  color: var(--accent-yellow);
  border-color: rgba(245, 158, 11, 0.3);
}

/* Speedcubing Timer */
.timer-section {
  background: rgba(0, 0, 0, 0.3);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  padding: 0.85rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.timer-display {
  font-family: var(--font-mono);
  font-size: 1.85rem;
  font-weight: 700;
  color: var(--accent-cyan);
  letter-spacing: 1px;
}

.timer-display.running {
  color: var(--accent-green);
}

.timer-controls {
  display: flex;
  gap: 0.4rem;
}

/* Action Buttons */
.action-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.5rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.65rem 0.75rem;
  border-radius: var(--radius-md);
  font-family: var(--font-family);
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  border: none;
  white-space: nowrap;
}

.btn-sm {
  padding: 0.4rem 0.75rem;
  font-size: 0.8rem;
  border-radius: var(--radius-sm);
}

.btn-primary {
  background: linear-gradient(135deg, #00c6ff, #0072ff);
  color: #ffffff;
  box-shadow: 0 4px 15px rgba(0, 198, 255, 0.3);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(0, 198, 255, 0.45);
}

.btn-success {
  background: linear-gradient(135deg, #10b981, #059669);
  color: #ffffff;
  box-shadow: 0 4px 15px rgba(16, 185, 129, 0.35);
}

.btn-success:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(16, 185, 129, 0.5);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.08);
  color: var(--text-main);
  border: 1px solid var(--border-glass);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.14);
}

.btn-outline {
  background: transparent;
  color: var(--text-main);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.4);
}

.btn-ghost {
  background: transparent;
  color: var(--text-muted);
}

.btn-ghost:hover {
  color: var(--text-main);
  background: rgba(255, 255, 255, 0.06);
}

.btn-ghost-sm {
  background: transparent;
  border: none;
  color: var(--text-dim);
  font-size: 0.75rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.2rem 0.4rem;
  border-radius: 4px;
}

.btn-ghost-sm:hover {
  color: var(--text-main);
  background: rgba(255, 255, 255, 0.08);
}

/* Scramble Box */
.scramble-box {
  background: rgba(0, 0, 0, 0.25);
  border-radius: var(--radius-md);
  padding: 0.65rem 0.85rem;
  border: 1px solid var(--border-glass);
}

.scramble-label {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--text-dim);
  letter-spacing: 0.5px;
}

.scramble-code {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--accent-yellow);
  margin-top: 0.25rem;
  word-break: break-word;
  line-height: 1.4;
}

/* Turn Controls (Virtual Keypad) */
.turn-controls-section {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  background: rgba(0, 0, 0, 0.2);
  padding: 0.85rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-glass);
}

.section-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-muted);
}

.move-modifier-toggle {
  display: flex;
  background: rgba(0, 0, 0, 0.3);
  padding: 2px;
  border-radius: var(--radius-sm);
}

.mod-btn {
  border: none;
  background: transparent;
  color: var(--text-dim);
  font-size: 0.7rem;
  font-weight: 600;
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.mod-btn.active {
  background: var(--accent-cyan);
  color: #000;
  font-weight: 700;
}

.move-pad-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.5rem;
}

.move-btn {
  height: 48px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-sm);
  color: var(--text-main);
  font-family: var(--font-mono);
  font-size: 1.15rem;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.move-btn .sub {
  font-family: var(--font-family);
  font-size: 0.65rem;
  font-weight: 500;
  color: var(--text-dim);
}

.move-btn:hover {
  background: rgba(0, 240, 255, 0.15);
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
  transform: translateY(-2px);
}

.move-btn:active {
  transform: scale(0.96);
}

.slice-rotations-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.35rem;
}

.slice-btn {
  flex: 1;
  padding: 0.35rem 0;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.slice-btn:hover {
  background: rgba(255, 255, 255, 0.1);
  color: var(--text-main);
}

.divider {
  width: 1px;
  height: 20px;
  background: var(--border-glass);
}

/* Keyboard Helper */
.keyboard-helper {
  background: rgba(0, 0, 0, 0.18);
  border-radius: var(--radius-sm);
  padding: 0.6rem 0.8rem;
  border: 1px solid var(--border-glass);
}

.helper-header {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 0.4rem;
}

.helper-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.key-tag {
  font-size: 0.72rem;
  color: var(--text-muted);
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
}

kbd {
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 4px;
  padding: 0.1rem 0.35rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--text-main);
  box-shadow: 0 2px 0 rgba(0, 0, 0, 0.4);
}

/* Speed Slider */
.speed-slider-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.speed-slider-row input[type="range"] {
  flex: 1;
  accent-color: var(--accent-cyan);
}

#speed-val {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent-cyan);
  width: 45px;
}

/* Move History Strip */
.move-history-container {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.history-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-muted);
}

.history-strip {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.5rem;
  background: rgba(0, 0, 0, 0.25);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-glass);
  overflow-x: auto;
  min-height: 40px;
}

.history-strip::-webkit-scrollbar {
  height: 4px;
}

.history-token {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.2rem 0.45rem;
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.08);
  color: var(--text-main);
  flex-shrink: 0;
}

.history-token.latest {
  background: var(--accent-cyan);
  color: #000;
}

.empty-history {
  font-size: 0.75rem;
  color: var(--text-dim);
  font-style: italic;
}

/* ==========================================================================
   Responsive Adaptations
   ========================================================================== */

@media (max-width: 900px) {
  .main-stage {
    flex-direction: column;
    height: auto;
    overflow-y: auto;
  }
  
  #canvas-container {
    height: 48vh;
    min-height: 320px;
  }
  
  .mode-panel {
    width: 100%;
    max-width: 100%;
    padding: 1rem;
    height: auto;
  }

  .camera-presets-panel {
    bottom: 0.75rem;
    left: 0.75rem;
    transform: scale(0.9);
    transform-origin: bottom left;
  }

  .viewport-quick-actions {
    top: 0.75rem;
    right: 0.75rem;
  }

  .floating-action-btn,
  .floating-square-btn {
    padding: 0.45rem 0.8rem;
    font-size: 0.75rem;
  }
}

@media (max-width: 600px) {
  .top-nav {
    padding: 0.5rem 0.75rem;
  }

  .logo-text h1 {
    font-size: 1.05rem;
  }

  .tagline {
    display: none;
  }

  .mode-tabs {
    gap: 0.25rem;
  }

  .mode-btn {
    padding: 0.4rem 0.65rem;
    font-size: 0.75rem;
  }

  .mode-btn span {
    font-size: 0.72rem;
  }

  .cube-orientation-badge {
    top: 0.75rem;
    left: 0.75rem;
    padding: 0.4rem 0.65rem;
    font-size: 0.7rem;
  }

  .camera-presets-panel {
    transform: scale(0.8);
    left: 0.5rem;
    bottom: 0.5rem;
  }
}