/* ========================================
   3D Particle Model Viewer - Dark Theme
   ======================================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

/* CSS Variables */
:root {
  --bg-primary: #06060f;
  --bg-secondary: #0d0d1a;
  --bg-glass: rgba(12, 12, 30, 0.65);
  --bg-glass-hover: rgba(20, 20, 45, 0.75);
  --border-glass: rgba(255, 255, 255, 0.08);
  --border-glass-hover: rgba(255, 255, 255, 0.15);

  --accent-cyan: #00f5d4;
  --accent-blue: #00bbf9;
  --accent-purple: #9b5de5;
  --accent-pink: #f15bb5;

  --glow-cyan: 0 0 20px rgba(0, 245, 212, 0.3), 0 0 60px rgba(0, 245, 212, 0.1);
  --glow-blue: 0 0 20px rgba(0, 187, 249, 0.3), 0 0 60px rgba(0, 187, 249, 0.1);
  --glow-purple: 0 0 20px rgba(155, 93, 229, 0.3);

  --text-primary: #f0f0f5;
  --text-secondary: rgba(240, 240, 245, 0.6);
  --text-muted: rgba(240, 240, 245, 0.35);

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;

  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-smooth: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-spring: 0.6s cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* Reset & Base */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* App Container */
.app-container {
  position: relative;
  width: 100%;
  height: 100%;
  background: 
    radial-gradient(ellipse at 20% 50%, rgba(155, 93, 229, 0.06) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 20%, rgba(0, 187, 249, 0.05) 0%, transparent 50%),
    radial-gradient(ellipse at 50% 80%, rgba(0, 245, 212, 0.04) 0%, transparent 50%),
    linear-gradient(180deg, var(--bg-primary) 0%, var(--bg-secondary) 50%, #0a0518 100%);
}

/* Canvas Container */
#canvas-container {
  position: absolute;
  inset: 0;
  z-index: 1;
}

#canvas-container canvas {
  display: block;
  width: 100% !important;
  height: 100% !important;
}

/* ========================================
   Toolbar
   ======================================== */
.toolbar {
  position: absolute;
  top: 20px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 100;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 16px;
  background: var(--bg-glass);
  backdrop-filter: blur(24px) saturate(1.3);
  -webkit-backdrop-filter: blur(24px) saturate(1.3);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-xl);
  box-shadow:
    0 8px 32px rgba(0, 0, 0, 0.4),
    inset 0 1px 0 rgba(255, 255, 255, 0.05);
  transition: var(--transition-smooth);
  max-width: 90vw;
}

/* Hide URL input and load button inside toolbar when on landing page */
.landing-mode #toolbar-url-wrapper,
.landing-mode #btn-load,
.landing-mode #toolbar-url-divider {
  display: none !important;
}

.toolbar:hover {
  border-color: var(--border-glass-hover);
  box-shadow:
    0 12px 40px rgba(0, 0, 0, 0.5),
    inset 0 1px 0 rgba(255, 255, 255, 0.08);
}

/* URL Input */
.url-input-wrapper {
  position: relative;
  flex: 1;
  min-width: 280px;
}

.url-input {
  width: 100%;
  padding: 10px 16px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: 'Inter', sans-serif;
  font-size: 13px;
  font-weight: 400;
  letter-spacing: 0.01em;
  outline: none;
  transition: var(--transition-fast);
}

.url-input::placeholder {
  color: var(--text-muted);
}

.url-input:focus {
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(0, 245, 212, 0.3);
  box-shadow: 0 0 0 3px rgba(0, 245, 212, 0.08);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 18px;
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  font-family: 'Inter', sans-serif;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition-fast);
  white-space: nowrap;
  position: relative;
  overflow: hidden;
}

/* Hide load button icon on desktop to only show "Load" text */
#btn-load svg,
#landing-btn-load svg {
  display: none;
}

.btn::before {
  content: '';
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.btn:hover::before {
  opacity: 1;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
  color: #06060f;
  font-weight: 600;
  box-shadow: var(--glow-cyan);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 0 30px rgba(0, 245, 212, 0.4), 0 0 80px rgba(0, 245, 212, 0.15);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(255, 255, 255, 0.1);
  color: var(--text-primary);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.18);
}

.btn-secondary.active {
  background: rgba(0, 245, 212, 0.12);
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
  box-shadow: 0 0 15px rgba(0, 245, 212, 0.2);
}

.btn-secondary.active:hover {
  background: rgba(0, 245, 212, 0.18);
  border-color: var(--accent-cyan);
  box-shadow: 0 0 20px rgba(0, 245, 212, 0.3);
}

.btn-icon {
  padding: 10px;
  border-radius: var(--radius-md);
}

/* Divider */
.toolbar-divider {
  width: 1px;
  height: 24px;
  background: rgba(255, 255, 255, 0.08);
  flex-shrink: 0;
}

/* File Input Hidden */
.file-input-hidden {
  display: none;
}

/* ========================================
   Webcam Preview
   ======================================== */
.webcam-container {
  position: absolute;
  bottom: 24px;
  right: 24px;
  z-index: 100;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 10px;
  transition: bottom var(--transition-smooth);
}

.webcam-container:not(.hidden) {
  bottom: 104px;
}

.webcam-preview {
  width: 220px;
  height: 165px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: rgba(0, 0, 0, 0.6);
  border: 1px solid var(--border-glass);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
  position: relative;
  transition: var(--transition-smooth);
}

.webcam-preview:hover {
  border-color: var(--border-glass-hover);
  transform: scale(1.02);
}

.webcam-preview video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transform: scaleX(-1);
}

.webcam-preview .webcam-label {
  position: absolute;
  top: 8px;
  left: 10px;
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 3px 8px;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(8px);
  border-radius: 6px;
  font-size: 10px;
  font-weight: 500;
  color: var(--text-secondary);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.webcam-label .dot {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: #ef4444;
  animation: pulse-dot 2s ease-in-out infinite;
}

.webcam-label .dot.active {
  background: var(--accent-cyan);
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

/* ========================================
   Gesture Status
   ======================================== */
.gesture-status {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 8px 14px;
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  font-size: 12px;
  font-weight: 500;
  color: var(--text-secondary);
  transition: var(--transition-smooth);
  width: 220px;
  box-sizing: border-box;
}

.gesture-status.active {
  border-color: rgba(0, 245, 212, 0.2);
  color: var(--accent-cyan);
}

.gesture-status .gesture-icon {
  font-size: 18px;
  transition: var(--transition-spring);
}

.gesture-status .gesture-text {
  min-width: 80px;
}

/* ========================================
   Stats Panel
   ======================================== */
.stats-panel {
  position: absolute;
  bottom: 24px;
  left: 24px;
  z-index: 100;
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 10px 14px;
  background: var(--bg-glass);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  font-size: 11px;
  font-weight: 400;
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
  opacity: 0;
  width: 155px;
  white-space: nowrap;
  transition: opacity var(--transition-smooth), bottom var(--transition-smooth);
}

.stats-panel.visible {
  opacity: 1;
}

.stats-panel .stat-row {
  display: flex;
  align-items: center;
  gap: 6px;
}

.stats-panel .stat-label {
  color: var(--text-muted);
}

.stats-panel .stat-value {
  color: var(--text-secondary);
  font-weight: 500;
}

/* ========================================
   Progress Control
   ======================================== */
.progress-control {
  position: absolute;
  bottom: 24px;
  right: 24px;
  z-index: 100;
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 8px 12px;
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  opacity: 0;
  transition: opacity var(--transition-smooth), bottom var(--transition-smooth);
}

.progress-control.visible {
  opacity: 1;
}

.progress-control .progress-label {
  display: flex;
  justify-content: space-between;
  font-size: 11px;
  font-weight: 500;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.progress-control .progress-value {
  color: var(--accent-cyan);
  font-variant-numeric: tabular-nums;
}

/* Custom Range Slider */
.progress-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 200px;
  height: 4px;
  border-radius: 2px;
  background: rgba(255, 255, 255, 0.08);
  outline: none;
  cursor: pointer;
}

.progress-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
  box-shadow: 0 0 10px rgba(0, 245, 212, 0.4);
  cursor: pointer;
  transition: var(--transition-fast);
}

.progress-slider::-webkit-slider-thumb:hover {
  transform: scale(1.2);
  box-shadow: 0 0 16px rgba(0, 245, 212, 0.6);
}

.progress-slider::-moz-range-thumb {
  width: 16px;
  height: 16px;
  border: none;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
  box-shadow: 0 0 10px rgba(0, 245, 212, 0.4);
  cursor: pointer;
}

/* ========================================
   Loading Overlay
   ======================================== */
.loading-overlay {
  position: absolute;
  inset: 0;
  z-index: 200;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 24px;
  background: rgba(6, 6, 15, 0.85);
  backdrop-filter: blur(12px);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.5s ease;
}

.loading-overlay.visible {
  opacity: 1;
  pointer-events: auto;
}

/* Pulse Ring Loader */
.loading-ring {
  position: relative;
  width: 80px;
  height: 80px;
}

.loading-ring .ring {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  border: 2px solid transparent;
  animation: spin-ring 1.5s cubic-bezier(0.5, 0, 0.5, 1) infinite;
}

.loading-ring .ring:nth-child(1) {
  border-top-color: var(--accent-cyan);
  animation-delay: -0.45s;
}

.loading-ring .ring:nth-child(2) {
  inset: 6px;
  border-right-color: var(--accent-blue);
  animation-delay: -0.3s;
  animation-direction: reverse;
}

.loading-ring .ring:nth-child(3) {
  inset: 12px;
  border-bottom-color: var(--accent-purple);
  animation-delay: -0.15s;
}

@keyframes spin-ring {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

.loading-text {
  font-size: 14px;
  font-weight: 400;
  color: var(--text-secondary);
  letter-spacing: 0.03em;
}

.loading-progress {
  width: 200px;
  height: 3px;
  background: rgba(255, 255, 255, 0.06);
  border-radius: 2px;
  overflow: hidden;
}

.loading-progress .bar {
  height: 100%;
  background: linear-gradient(90deg, var(--accent-cyan), var(--accent-blue), var(--accent-purple));
  border-radius: 2px;
  width: 0%;
  transition: width 0.3s ease;
  animation: shimmer 2s linear infinite;
  background-size: 200% 100%;
}

@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

/* ========================================
   Welcome / Intro
   ======================================== */
.welcome-hint {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 150;
  text-align: center;
  pointer-events: auto;
  opacity: 1;
  transition: opacity 0.5s cubic-bezier(0.4, 0, 0.2, 1), transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  width: 90%;
  max-width: 580px;
}

.welcome-hint.hidden {
  opacity: 0 !important;
  transform: translate(-50%, -45%);
  pointer-events: none;
}

.landing-card {
  background: transparent;
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
  border: none;
  padding: 20px 0;
  box-shadow: none;
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 100%;
}

.landing-logo {
  font-size: 42px;
  margin-bottom: 20px;
  filter: drop-shadow(0 0 20px rgba(0, 245, 212, 0.5));
  animation: float-logo 3s ease-in-out infinite;
}

@keyframes float-logo {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

.welcome-hint h2 {
  font-size: 26px;
  font-weight: 700;
  color: var(--accent-cyan);
  margin-bottom: 12px;
  letter-spacing: -0.01em;
  text-shadow: 0 0 15px rgba(0, 245, 212, 0.2);
}

.welcome-hint p {
  font-size: 14px;
  color: #ffffff;
  line-height: 1.6;
  margin-bottom: 30px;
  max-width: 440px;
}

.landing-input-box {
  display: flex;
  align-items: center;
  width: 100%;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 12px;
  padding: 6px;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: inset 0 2px 4px rgba(0,0,0,0.2);
}

.landing-input-box:focus-within {
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--accent-cyan);
  box-shadow: 
    0 0 0 3px rgba(0, 245, 212, 0.15),
    inset 0 2px 4px rgba(0,0,0,0.1);
}

.landing-input-box input {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  padding: 10px 14px;
  color: var(--text-primary);
  font-size: 14px;
  width: 100%;
}

.landing-input-box input::placeholder {
  color: rgba(255, 255, 255, 0.35);
}

.landing-input-box button {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 10px 20px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 13px;
  height: auto;
  margin: 0;
}

/* ========================================
   Notifications / Toast
   ======================================== */
.toast-container {
  position: absolute;
  top: 76px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 300;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.toast {
  padding: 10px 20px;
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  font-size: 13px;
  font-weight: 400;
  color: var(--text-primary);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
  animation: toast-in 0.4s var(--transition-spring) forwards;
  max-width: 400px;
  text-align: center;
}

.toast.error {
  border-color: rgba(239, 68, 68, 0.3);
  color: #fca5a5;
}

.toast.success {
  border-color: rgba(0, 245, 212, 0.3);
  color: var(--accent-cyan);
}

.toast.fade-out {
  animation: toast-out 0.3s ease forwards;
}

@keyframes toast-in {
  0% { opacity: 0; transform: translateY(-10px) scale(0.95); }
  100% { opacity: 1; transform: translateY(0) scale(1); }
}

@keyframes toast-out {
  0% { opacity: 1; transform: translateY(0) scale(1); }
  100% { opacity: 0; transform: translateY(-10px) scale(0.95); }
}

/* ========================================
   Responsive
   ======================================== */
@media (max-width: 1200px) {
  .toolbar {
    max-width: 95vw;
  }
  .url-input-wrapper {
    min-width: 200px;
  }
}

@media (max-width: 1024px) {
  .btn-text {
    display: none;
  }
  #btn-load svg,
  #landing-btn-load svg {
    display: inline-block;
  }
  .btn {
    padding: 10px 12px;
  }
  .url-input-wrapper {
    min-width: 160px;
  }
  .toolbar {
    gap: 6px;
    padding: 8px 12px;
  }
}

@media (max-width: 768px) {
  .url-input-wrapper {
    min-width: 140px;
  }
  .btn {
    padding: 8px 10px;
  }
  .toolbar-divider {
    height: 16px;
  }
  .webcam-preview {
    width: 160px;
    height: 120px;
  }
  .progress-control {
    bottom: 16px;
    right: 16px;
    left: auto;
  }
  .progress-slider {
    width: 150px;
  }
  .webcam-container {
    bottom: 16px;
    right: 16px;
  }
  .webcam-container:not(.hidden) {
    bottom: 96px;
  }
  .gesture-guide {
    width: 160px;
    font-size: 9px;
    padding: 8px;
  }
  .remy-intro-panel {
    right: 16px;
    width: 280px;
    padding: 12px;
  }
}

@media (max-width: 900px), (pointer: coarse) {
  .toolbar {
    position: fixed;
    top: auto;
    bottom: calc(10px + env(safe-area-inset-bottom));
    left: 10px;
    right: 10px;
    transform: none;
    justify-content: space-around;
    max-width: none;
    min-height: 52px;
    padding: 6px 8px;
    gap: 6px;
    background: transparent;
    border: none;
    border-radius: 0;
    box-shadow: none;
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
    transition: none;
  }

  .toolbar:hover {
    border: none;
    box-shadow: none;
  }

  .landing-mode .toolbar,
  #toolbar-url-wrapper,
  #btn-load,
  #toolbar-url-divider,
  #btn-gesture,
  #btn-gesture + .toolbar-divider {
    display: none !important;
  }

  .toolbar .btn {
    flex: 1 1 0;
    min-width: 46px;
    min-height: 44px;
    padding: 9px 8px;
    border-radius: 10px;
    touch-action: manipulation;
    transition: none;
  }

  .toolbar .btn-secondary,
  .preview-controls .btn-secondary,
  .recording-controls .btn-secondary {
    background: rgba(18, 18, 38, 0.86);
    border-color: rgba(255, 255, 255, 0.14);
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.28);
  }

  .toolbar .btn-secondary:hover,
  .preview-controls .btn-secondary:hover,
  .recording-controls .btn-secondary:hover {
    background: rgba(18, 18, 38, 0.86);
    border-color: rgba(255, 255, 255, 0.14);
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.28);
    transform: none;
  }

  .toolbar .btn-secondary.active,
  .toolbar .btn-secondary.active:hover {
    background: rgba(18, 18, 38, 0.92);
    border-color: rgba(0, 245, 212, 0.65);
    color: var(--accent-cyan);
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.28);
  }

  .preview-controls .btn-primary,
  .recording-controls .btn-primary {
    box-shadow: 0 4px 16px rgba(0, 245, 212, 0.2);
  }

  .toolbar .btn-icon-emoji {
    font-size: 18px;
  }

  .toolbar-divider {
    display: none;
  }

  .settings-panel, .camera-path-panel {
    position: fixed;
    top: auto !important;
    bottom: calc(76px + env(safe-area-inset-bottom)) !important;
    left: 10px !important;
    right: 10px !important;
    width: auto !important;
    max-height: calc(100dvh - 140px - env(safe-area-inset-top) - env(safe-area-inset-bottom));
    overflow-y: auto;
    overscroll-behavior: contain;
    padding: 16px;
    gap: 12px;
    z-index: 150;
  }

  .settings-panel h3,
  .camera-path-panel h3 {
    position: sticky;
    top: -16px;
    z-index: 2;
    margin: -16px -16px 4px;
    padding: 16px 16px 10px;
    background: rgba(10, 10, 25, 0.96);
    font-size: 12px;
  }

  .camera-path-panel > p,
  .setting-item label,
  .camera-path-panel label {
    font-size: 11px !important;
    line-height: 1.45;
  }

  .camera-actions {
    position: sticky;
    bottom: -16px;
    z-index: 2;
    margin: 0 -16px -16px;
    padding: 10px 16px 16px;
    background: linear-gradient(to bottom, rgba(10, 10, 25, 0.82), rgba(10, 10, 25, 0.98) 24%);
  }

  .camera-actions .btn,
  .settings-panel .btn,
  .setting-item select,
  #select-preset-flight {
    min-height: 44px;
    font-size: 12px !important;
    touch-action: manipulation;
  }

  .setting-item input[type="range"] {
    min-height: 32px;
    touch-action: pan-y;
  }

  .setting-item input[type="range"]::-webkit-slider-thumb,
  .progress-slider::-webkit-slider-thumb {
    width: 26px;
    height: 26px;
  }

  .setting-item input[type="range"]::-moz-range-thumb,
  .progress-slider::-moz-range-thumb {
    width: 26px;
    height: 26px;
  }

  .stats-panel {
    display: none !important;
  }

  .progress-control {
    position: fixed;
    bottom: calc(76px + env(safe-area-inset-bottom)) !important;
    right: 10px !important;
    left: 10px !important;
    width: auto;
    box-sizing: border-box;
    padding: 10px 14px;
    transition: opacity 0.2s ease, transform 0.2s ease;
  }

  .progress-control .progress-label {
    font-size: 10px;
  }

  .progress-slider {
    width: 100%;
    min-height: 28px;
    touch-action: pan-y;
  }

  #btn-play-scatter {
    min-width: 52px !important;
    min-height: 36px;
    font-size: 11px !important;
    touch-action: manipulation;
  }

  body.camera-path-active .progress-control,
  body.settings-panel-active .progress-control,
  body.camera-path-active .remy-intro-panel,
  body.settings-panel-active .remy-intro-panel {
    opacity: 0 !important;
    pointer-events: none;
    transform: translateY(12px);
  }

  .webcam-container {
    display: none !important;
  }

  .remy-intro-panel {
    position: fixed;
    right: 10px !important;
    left: 10px;
    bottom: calc(154px + env(safe-area-inset-bottom)) !important;
    width: auto !important;
    max-height: 124px;
    overflow: auto;
    padding: 11px 12px !important;
  }

  .remy-intro-title {
    font-size: 11px;
  }

  .remy-intro-content,
  .remy-visit-link {
    font-size: 9px;
  }

  .lang-toggle-btn {
    top: calc(10px + env(safe-area-inset-top));
    right: 12px;
    min-width: 52px;
    min-height: 36px;
    justify-content: flex-end;
    font-size: 12px;
  }

  .toast-container {
    top: calc(48px + env(safe-area-inset-top));
    width: calc(100% - 24px);
  }

  .toast {
    max-width: 100%;
    padding: 9px 14px;
    font-size: 11px;
  }

  .landing-card {
    width: calc(100vw - 28px);
    padding: 24px 16px;
    box-sizing: border-box;
  }

  .landing-card h2 {
    font-size: 20px;
    line-height: 1.25;
  }

  .landing-card p {
    font-size: 11px;
    line-height: 1.55;
  }

  .landing-input-box {
    flex-direction: column;
    padding: 6px;
  }

  .landing-input-box input,
  .landing-input-box button {
    width: 100%;
    min-height: 44px;
    box-sizing: border-box;
  }

  .mobile-export-sheet {
    position: fixed;
    inset: 0;
    z-index: 500;
    display: flex;
    align-items: flex-end;
    padding: 16px 12px calc(16px + env(safe-area-inset-bottom));
    background: rgba(0, 0, 0, 0.58);
    backdrop-filter: blur(8px);
    box-sizing: border-box;
  }

  .mobile-export-card {
    width: 100%;
    padding: 18px;
    border: 1px solid var(--border-glass-hover);
    border-radius: 18px;
    background: rgba(13, 13, 30, 0.98);
    box-shadow: 0 -12px 40px rgba(0, 0, 0, 0.45);
  }

  .mobile-export-card h3 {
    margin-bottom: 6px;
    font-size: 15px;
  }

  .mobile-export-card p {
    margin-bottom: 14px;
    color: var(--text-secondary);
    font-size: 11px;
    line-height: 1.5;
  }

  .mobile-export-actions {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
  }

  .mobile-export-actions .btn {
    min-height: 46px;
    text-decoration: none;
  }
}

/* ========================================
   Scrollbar (for any overflow elements)
   ======================================== */
::-webkit-scrollbar {
  width: 4px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.1);
  border-radius: 2px;
}

::-webkit-scrollbar-thumb:hover {
  background: rgba(255, 255, 255, 0.2);
}

/* ========================================
   Utility
   ======================================== */
.hidden {
  display: none !important;
}

.no-select {
  user-select: none;
  -webkit-user-select: none;
}

/* ========================================
   Settings Panel
   ======================================== */
.settings-panel {
  position: absolute;
  top: 96px;
  left: 20px;
  z-index: 100;
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 18px;
  background: var(--bg-glass);
  backdrop-filter: blur(24px) saturate(1.3);
  -webkit-backdrop-filter: blur(24px) saturate(1.3);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  box-shadow:
    0 12px 40px rgba(0, 0, 0, 0.5),
    inset 0 1px 0 rgba(255, 255, 255, 0.05);
  width: 280px;
  transition: opacity var(--transition-smooth), transform var(--transition-smooth);
}

.settings-panel.hidden {
  opacity: 0;
  pointer-events: none;
  transform: translateY(-10px);
}

.settings-panel h3 {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 2px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  padding-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.setting-item {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.setting-item label {
  font-size: 10px;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.setting-item select {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  padding: 8px 10px;
  font-family: 'Inter', sans-serif;
  font-size: 12px;
  outline: none;
  cursor: pointer;
  transition: var(--transition-fast);
}

.setting-item select:focus {
  border-color: rgba(0, 245, 212, 0.3);
  background: rgba(20, 20, 45, 0.8);
}

.setting-item select option {
  background: var(--bg-secondary);
  color: var(--text-primary);
}

.slider-ticks {
  display: flex;
  justify-content: space-between;
  padding: 0 4px;
  margin-top: 2px;
}

.slider-ticks span {
  font-size: 8.5px;
  color: var(--text-secondary);
  opacity: 0.6;
  font-family: 'Inter', sans-serif;
  white-space: nowrap;
}

.setting-row-val {
  display: flex;
  justify-content: space-between;
  align-items: center;
}


.setting-val-display {
  font-size: 11px;
  font-weight: 600;
  color: var(--accent-cyan);
  font-variant-numeric: tabular-nums;
}

.settings-panel .btn {
  width: 100%;
}

.mobile-setting-tabs,
.mobile-camera-options {
  display: none;
}

#desktop-flight-anchor,
#desktop-scatter-anchor {
  display: none;
}

/* ========================================
   Camera Path Panel
   ======================================== */
.camera-path-panel {
  position: absolute;
  top: 96px;
  left: 20px;
  z-index: 100;
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 18px;
  background: var(--bg-glass);
  backdrop-filter: blur(24px) saturate(1.3);
  -webkit-backdrop-filter: blur(24px) saturate(1.3);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  box-shadow:
    0 12px 40px rgba(0, 0, 0, 0.5),
    inset 0 1px 0 rgba(255, 255, 255, 0.05);
  width: 280px;
  transition: opacity var(--transition-smooth), transform var(--transition-smooth);
}

.camera-path-panel.hidden {
  opacity: 0;
  pointer-events: none;
  transform: translateY(-10px);
}

.camera-path-panel h3 {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 2px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  padding-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.camera-panel-header {
  display: block;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.camera-panel-header h3 {
  flex: 1;
  margin: 0 0 2px;
}

.camera-header-preview {
  display: none;
  padding: 5px 10px;
  border: 1px solid rgba(0, 245, 212, 0.3);
  border-radius: 999px;
  background: rgba(0, 245, 212, 0.08);
  color: var(--accent-cyan);
  font: 600 10px 'Inter', sans-serif;
  cursor: pointer;
}

.camera-header-preview:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

.preview-controls {
  display: none;
}

.recording-controls,
.recording-indicator {
  display: none;
}

body.preview-mode-active .toolbar {
  display: none !important;
}

body.preview-mode-active .preview-controls {
  position: fixed;
  right: 16px;
  bottom: 16px;
  z-index: 220;
  display: grid;
  grid-template-columns: repeat(3, minmax(110px, 1fr));
  gap: 8px;
  padding: 0;
}

body.preview-mode-active .progress-control {
  bottom: 82px;
}

body.recording-mode-active .toolbar,
body.recording-mode-active .preview-controls {
  display: none !important;
}

body.recording-mode-active .recording-controls {
  position: fixed;
  right: 16px;
  bottom: 16px;
  z-index: 220;
  display: grid;
  grid-template-columns: repeat(2, minmax(130px, 1fr));
  gap: 8px;
  padding: 0;
}

body.recording-mode-active .recording-indicator {
  display: inline-block;
  color: #ff5c68;
  font-size: 9px;
  font-weight: 700;
  white-space: nowrap;
  animation: recording-blink 0.9s ease-in-out infinite;
  position: absolute;
  bottom: calc(100% + 5px);
  left: 4px;
}

body.recording-mode-active #btn-play-scatter {
  display: none !important;
}

body.recording-mode-active .progress-control {
  bottom: 82px;
}

@keyframes recording-blink {
  0%, 100% { opacity: 0.35; }
  50% { opacity: 1; }
}

.camera-actions {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.camera-action-row {
  display: flex;
  gap: 8px;
}

.camera-action-row .btn {
  flex: 1;
  min-width: 0;
  justify-content: center;
}

.keyframe-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-height: 200px;
  overflow-y: auto;
  margin-bottom: 4px;
  padding-right: 4px;
}

.keyframe-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 12px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-sm);
  font-size: 12px;
}

.keyframe-item span {
  font-weight: 500;
  color: var(--text-primary);
}

.keyframe-item .btn-remove {
  background: none;
  border: none;
  color: #ef4444;
  cursor: pointer;
  font-size: 12px;
  opacity: 0.7;
  transition: opacity 0.2s;
}

.keyframe-item .btn-remove:hover {
  opacity: 1;
}

/* Language Toggle Button (Top Right Plain Text) */
.lang-toggle-btn {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 1000;
  background: none;
  border: none;
  padding: 4px 0;
  font-family: 'Inter', sans-serif;
  font-size: 13px;
  color: var(--text-muted);
  cursor: pointer;
  transition: var(--transition-smooth);
  display: flex;
  align-items: center;
  gap: 2px;
}

.lang-toggle-btn:hover {
  color: var(--text-primary);
}

.lang-toggle-btn .lang-sep {
  opacity: 0.5;
  margin: 0 1px;
}

.lang-toggle-btn .active-lang {
  color: var(--accent-cyan);
  font-weight: 600;
  text-shadow: 0 0 10px rgba(0, 245, 212, 0.5);
}

.home-btn {
  position: fixed;
  top: calc(16px + env(safe-area-inset-top));
  left: 16px;
  z-index: 210;
  padding: 7px 12px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 999px;
  background: rgba(10, 10, 25, 0.62);
  color: var(--text-primary);
  font: 600 11px 'Inter', sans-serif;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  cursor: pointer;
}

.landing-mode .home-btn {
  display: none;
}

/* ========================================
   Remy Intro Panel
   ======================================== */
.remy-intro-panel {
  position: absolute;
  bottom: 24px;
  right: 24px;
  width: 320px;
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  padding: 16px;
  box-sizing: border-box;
  z-index: 105;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
  transition: opacity 0.8s cubic-bezier(0.25, 1, 0.5, 1),
              transform 0.8s cubic-bezier(0.25, 1, 0.5, 1),
              filter 0.8s ease,
              bottom 0.4s cubic-bezier(0.25, 1, 0.5, 1);
}

.remy-intro-panel.minimized {
  opacity: 0;
  transform: none;
  filter: none;
  pointer-events: none;
  transition-duration: 0.2s;
}

.remy-intro-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 10px;
}

.remy-intro-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--accent-cyan);
  text-shadow: 0 0 10px rgba(0, 245, 212, 0.3);
}

.remy-visit-link {
  font-size: 10px;
  color: var(--accent-cyan);
  text-decoration: none;
  opacity: 0.7;
  transition: opacity 0.2s, text-shadow 0.2s;
  margin-left: auto;
  margin-right: 8px;
  white-space: nowrap;
}

.remy-visit-link:hover {
  opacity: 1;
  text-decoration: underline;
  text-shadow: 0 0 8px rgba(0, 245, 212, 0.5);
}

/* Hyperlinks in welcome description */
.desc-link {
  color: var(--accent-cyan);
  text-decoration: underline;
  text-underline-offset: 2px;
  transition: color 0.2s, text-shadow 0.2s;
}

.desc-link:hover {
  color: #ffffff;
  text-shadow: 0 0 8px rgba(0, 245, 212, 0.6);
}

.remy-minimize-btn {
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 18px;
  cursor: pointer;
  padding: 0 4px;
  line-height: 1;
  transition: color 0.2s;
}

.remy-minimize-btn:hover {
  color: var(--accent-cyan);
}

.remy-intro-content {
  font-size: 11px;
  color: #ffffff;
  line-height: 1.6;
  text-align: justify;
}

/* Light Particle Style */
.remy-light-particle {
  position: absolute;
  border-radius: 50%;
  pointer-events: none;
  z-index: 9999;
  background: radial-gradient(circle, #ffffff 30%, var(--accent-cyan) 80%);
  box-shadow: 0 0 10px var(--accent-cyan), 0 0 20px #ffffff;
  animation: remy-particle-fly 0.8s cubic-bezier(0.1, 0.8, 0.3, 1) forwards;
}

@keyframes remy-particle-fly {
  0% {
    transform: translate(0, 0) scale(1);
    opacity: 1;
  }
  100% {
    transform: translate(var(--dx), var(--dy)) scale(0);
    opacity: 0;
  }
}

/* Mobile editing workspace: compact, model-first controls inspired by timeline editors. */
@media (max-width: 900px), (pointer: coarse) {
  #btn-guide {
    display: none !important;
  }

  .toolbar .btn-icon-emoji {
    display: none !important;
  }

  .toolbar .btn-text {
    display: inline !important;
    font-size: 11px;
    white-space: nowrap;
  }

  .settings-panel,
  .camera-path-panel {
    max-height: min(44dvh, 340px);
    padding: 12px;
    gap: 8px;
  }

  .camera-path-panel {
    max-height: min(38dvh, 286px);
    gap: 4px;
  }

  .settings-panel h3,
  .camera-path-panel h3 {
    top: -12px;
    margin: -12px -12px 2px;
    padding: 10px 12px 8px;
  }

  .settings-panel > h3 {
    display: none;
  }

  .camera-panel-header {
    display: flex;
    position: sticky;
    top: -12px;
    z-index: 3;
    margin: -12px -12px 2px;
    padding: 9px 12px 8px;
    background: rgba(10, 10, 25, 0.96);
  }

  .camera-panel-header h3 {
    position: static;
    margin: 0;
    padding: 0;
    background: none;
  }

  .camera-header-preview {
    display: inline-block;
  }

  .camera-path-panel > p {
    display: none;
  }

  .mobile-camera-options {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 6px;
  }

  .mobile-camera-options .camera-option-item {
    min-width: 0;
    margin: 0 !important;
    gap: 4px;
  }

  .mobile-camera-options .camera-option-item > label {
    display: flex;
    align-items: flex-end;
    min-height: 22px;
    margin: 0 !important;
  }

  .mobile-camera-options select {
    width: 100% !important;
    min-width: 0;
    min-height: 34px !important;
    margin: 0 !important;
    padding: 5px 6px !important;
    font-size: 10px !important;
  }

  #mobile-camera-options #select-preset-flight,
  #mobile-camera-options #setting-scatter-effect {
    font-size: 10px !important;
  }

  .keyframe-list:empty {
    display: none;
  }

  .keyframe-list:not(:empty) {
    flex-direction: row;
    gap: 6px;
    max-height: none;
    overflow-x: auto;
    overflow-y: hidden;
    margin: 2px 0;
    padding: 0 0 3px;
    scroll-snap-type: x proximity;
  }

  .keyframe-list:not(:empty) .keyframe-item {
    flex: 0 0 auto;
    min-width: 0;
    width: max-content;
    justify-content: flex-start;
    gap: 2px;
    padding: 5px 6px;
    scroll-snap-align: end;
  }

  .keyframe-list:not(:empty) .btn-remove {
    padding: 0 2px;
    line-height: 1;
  }

  .camera-path-panel.preset-mode .keyframe-list,
  .camera-path-panel.preset-mode .camera-actions {
    display: none;
  }

  .mobile-setting-tabs {
    display: flex;
    gap: 6px;
    overflow-x: auto;
    scrollbar-width: none;
  }

  .mobile-setting-tag {
    flex: 1 0 auto;
    min-height: 30px;
    padding: 5px 10px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.04);
    color: var(--text-secondary);
    font: 600 10px 'Inter', sans-serif;
  }

  .mobile-setting-tag.active {
    color: var(--accent-cyan);
    border-color: rgba(0, 245, 212, 0.4);
    background: rgba(0, 245, 212, 0.1);
  }

  .settings-panel.adjusting-settings {
    background: rgba(10, 10, 25, 0.18);
    border-color: rgba(255, 255, 255, 0.04);
    box-shadow: none;
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
  }

  .settings-panel .mobile-parameter {
    display: none;
  }

  .settings-panel .mobile-parameter.mobile-active {
    display: grid;
    grid-template-columns: 92px minmax(0, 1fr);
    align-items: center;
    gap: 10px;
  }

  .mobile-parameter .setting-row-val {
    min-width: 0;
    gap: 4px;
  }

  .mobile-parameter .setting-val-display {
    display: none;
  }

  .mobile-parameter .setting-row-val label {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .mobile-parameter .slider-ticks {
    display: none;
  }

  .camera-actions {
    position: static;
    bottom: auto;
    margin: 0;
    padding: 2px 0 0;
    gap: 4px;
    background: transparent;
  }

  .camera-actions .camera-action-row {
    gap: 6px;
  }

  .camera-actions .btn {
    min-height: 34px;
    padding: 6px 8px;
  }

  .setting-item input[type="range"] {
    min-height: 24px;
  }

  .setting-item input[type="range"]::-webkit-slider-thumb,
  .progress-slider::-webkit-slider-thumb {
    width: 18px;
    height: 18px;
  }

  .setting-item input[type="range"]::-moz-range-thumb,
  .progress-slider::-moz-range-thumb {
    width: 18px;
    height: 18px;
  }

  .progress-control {
    right: 10px !important;
    left: auto !important;
    width: 230px;
    padding: 6px 8px;
  }

  .progress-slider {
    -webkit-appearance: auto;
    appearance: auto;
    min-height: 16px;
    height: 16px;
    background: transparent;
    accent-color: var(--accent-cyan);
  }

  #btn-play-scatter {
    min-width: 38px !important;
    min-height: 26px;
    height: 26px !important;
    font-size: 9px !important;
  }

  .progress-slider::-webkit-slider-thumb {
    -webkit-appearance: auto;
    appearance: auto;
    width: auto;
    height: auto;
    box-shadow: none;
  }

  .progress-slider::-moz-range-thumb {
    width: auto;
    height: auto;
    box-shadow: none;
  }

  #btn-preview-path,
  #btn-export-video {
    display: none !important;
  }

  body.preview-mode-active .toolbar {
    display: none !important;
  }

  body.preview-mode-active .preview-controls {
    position: fixed;
    right: 10px;
    bottom: calc(10px + env(safe-area-inset-bottom));
    left: 10px;
    z-index: 220;
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 6px;
    padding: 0;
  }

  body.preview-mode-active .preview-controls .btn {
    min-width: 0;
    min-height: 40px;
    padding: 7px 5px;
    font-size: 10px;
    justify-content: center;
  }

  body.preview-mode-active .progress-control {
    bottom: calc(68px + env(safe-area-inset-bottom)) !important;
  }

  body.recording-mode-active .recording-controls {
    right: 10px;
    bottom: calc(10px + env(safe-area-inset-bottom));
    left: 10px;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  body.recording-mode-active .recording-controls .btn {
    min-height: 40px;
    padding: 7px 6px;
    font-size: 10px;
    justify-content: center;
  }

  body.recording-mode-active .progress-control {
    bottom: calc(68px + env(safe-area-inset-bottom)) !important;
  }

  .home-btn {
    top: calc(10px + env(safe-area-inset-top));
    left: 10px;
    display: flex;
    align-items: center;
    height: 36px;
    padding: 6px 11px;
  }

  .lang-toggle-btn {
    top: calc(10px + env(safe-area-inset-top));
    height: 36px;
    min-height: 36px;
    padding-top: 0;
    padding-bottom: 0;
    align-items: center;
  }

  .landing-mode .remy-intro-panel {
    bottom: calc(10px + env(safe-area-inset-bottom)) !important;
    max-height: 108px;
  }
}

/* ========================================
   Gesture Guide & Highlights
   ======================================== */
.gesture-guide {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 10px;
  background: rgba(0, 0, 0, 0.45);
  backdrop-filter: blur(16px);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: var(--radius-md);
  font-size: 10px;
  color: var(--text-secondary);
  width: 220px;
  box-sizing: border-box;
  text-align: left;
}

.gesture-guide-item {
  padding: 4px 6px;
  border-radius: 4px;
  transition: background-color 0.2s, color 0.2s, text-shadow 0.2s;
}

.gesture-guide-item.active {
  color: var(--accent-cyan) !important;
  background: rgba(0, 245, 212, 0.15);
  font-weight: 600;
  text-shadow: 0 0 10px rgba(0, 245, 212, 0.5);
}