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

:root {
  --accent-color: #00d4ff;
  --bg-color: #0a0a12;
  --item-bg: rgba(20, 20, 30, 0.9);
  --item-border: rgba(255, 255, 255, 0.1);
  --text-color: #ffffff;
  --text-muted: rgba(255, 255, 255, 0.5);
}

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: var(--bg-color);
  color: var(--text-color);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  touch-action: none;
  -webkit-user-select: none;
  user-select: none;
}

#canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: block;
}

/* UI Overlay */
#ui-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 10;
}

/* Save Button */
#save-btn {
  position: absolute;
  bottom: 24px;
  left: 24px;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.5);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 50%;
  color: var(--text-muted);
  cursor: pointer;
  pointer-events: auto;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: background 0.2s, border-color 0.2s, color 0.2s, opacity 0.3s;
}

#save-btn:hover {
  background: rgba(0, 0, 0, 0.7);
  border-color: var(--accent-color);
  color: var(--text-color);
}

#save-btn svg {
  width: 20px;
  height: 20px;
}

#save-btn.hidden {
  opacity: 0;
  pointer-events: none;
}

/* Open Button */
#open-btn {
  position: absolute;
  bottom: 24px;
  right: 24px;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.5);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 50%;
  color: var(--text-muted);
  cursor: pointer;
  pointer-events: auto;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: background 0.2s, border-color 0.2s, color 0.2s;
}

#open-btn:hover {
  background: rgba(0, 0, 0, 0.7);
  border-color: var(--accent-color);
  color: var(--text-color);
}

#open-btn svg {
  width: 20px;
  height: 20px;
}

/* Carousel Overlay */
#carousel-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 20;
  background: transparent;
  pointer-events: none;
}

#carousel-overlay.visible #carousel-container,
#carousel-overlay.visible #close-btn,
#carousel-overlay.visible #control-panel.visible {
  pointer-events: auto;
}

#carousel-overlay.hidden {
  pointer-events: none;
}

/* Close Button */
#close-btn {
  position: absolute;
  top: 16px;
  left: 16px;
  width: 36px;
  height: 36px;
  padding: 0;
  background: transparent;
  border: 1px solid var(--text-muted);
  border-radius: 50%;
  cursor: pointer;
  z-index: 25;
  opacity: 0;
  transition: opacity 0.3s ease-out;
}

#close-btn::before,
#close-btn::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 14px;
  height: 1.5px;
  background: var(--text-muted);
  border-radius: 1px;
}

#close-btn::before {
  transform: translate(-50%, -50%) rotate(45deg);
}

#close-btn::after {
  transform: translate(-50%, -50%) rotate(-45deg);
}

#close-btn.visible {
  opacity: 1;
}

/* Carousel Container */
#carousel-container {
  position: absolute;
  top: 0;
  right: 0;
  width: 100%;
  height: 100%;
  z-index: 10;
  transform: translateX(100%);
  transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

#carousel-container.visible {
  transform: translateX(0);
}

#carousel-container.hidden {
  transform: translateX(100%);
}

/* Ruler Carousel */
.ruler-carousel {
  position: absolute;
  top: 0;
  right: 0;
  width: 160px;
  height: 100%;
  cursor: grab;
}

.ruler-carousel:active {
  cursor: grabbing;
}

.ruler-carousel__axis {
  position: absolute;
  top: 0;
  right: 0;
  width: 2px;
  height: 100%;
  background: rgba(255, 255, 255, 0.15);
}

.ruler-carousel__items {
  position: relative;
  height: 100%;
}

.ruler-carousel__item {
  position: absolute;
  right: 0;
  display: flex;
  align-items: center;
  gap: 8px;
  transform: translateY(-50%);
  transition: opacity 0.1s ease-out;
  cursor: pointer;
}

.ruler-carousel__label {
  color: var(--text-muted);
  font-size: 12px;
  font-weight: 400;
  white-space: nowrap;
  transition: color 0.15s, font-size 0.1s ease-out;
  text-align: right;
}

.ruler-carousel__tick {
  width: 20px;
  height: 2px;
  background: rgba(255, 255, 255, 0.3);
  border-radius: 1px;
  transition: width 0.1s ease-out, height 0.15s, background 0.15s;
}

/* Active state */
.ruler-carousel__item.is-active .ruler-carousel__label {
  color: var(--text-color);
  font-weight: 500;
}

.ruler-carousel__item.is-active .ruler-carousel__tick {
  height: 3px;
  background: var(--accent-color);
}

/* Type-based colors */
.ruler-carousel__item[data-type="float"].is-active .ruler-carousel__tick {
  background: #00d4ff;
}

.ruler-carousel__item[data-type="vec2"].is-active .ruler-carousel__tick {
  background: #69db7c;
}

.ruler-carousel__item[data-type="vec3"].is-active .ruler-carousel__tick {
  background: #ffa94d;
}

/* Control Panel */
#control-panel {
  position: absolute;
  bottom: 44px;
  left: 10%;
  width: 80%;
  z-index: 30;
  padding: 0;
  border: none;
  background: transparent;
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.3s ease-out, transform 0.3s ease-out;
  pointer-events: none;
}

#control-panel.visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

#control-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}

#control-label-wrapper {
  display: flex;
  align-items: center;
  gap: 8px;
}

#control-label {
  font-size: 12px;
  font-weight: 500;
  color: var(--text-muted);
  letter-spacing: 0.5px;
  font-variant-numeric: tabular-nums;
}

#color-preview {
  display: none;
  width: 20px;
  height: 20px;
  border-radius: 4px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  flex-shrink: 0;
}

#color-preview.visible {
  display: block;
}

#control-scale {
  display: flex;
  align-items: center;
  gap: 6px;
}

#hold-label {
  font-size: 9px;
  font-weight: 600;
  color: var(--text-muted);
  padding: 2px 4px;
  border: 1px solid var(--text-muted);
  border-radius: 3px;
  opacity: 0.5;
  transition: opacity 0.15s, color 0.15s, border-color 0.15s;
}

#hold-label.active {
  opacity: 1;
  color: var(--accent-color);
  border-color: var(--accent-color);
}

#control-value {
  font-size: 11px;
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
  transition: color 0.15s;
}

#control-value.active {
  color: var(--accent-color);
}

/* Control UI visibility */
.control-ui {
  display: block;
  touch-action: none;
}

.control-ui.hidden {
  display: none;
}

/* Float: Slider */
#slider-track {
  position: relative;
  height: 4px;
  background: rgba(255, 255, 255, 0.15);
  border-radius: 2px;
  cursor: pointer;
  touch-action: none;
}

#slider-fill {
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  width: 50%;
  background: var(--accent-color);
  border-radius: 2px;
  pointer-events: none;
}

#slider-thumb {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 20px;
  height: 20px;
  background: var(--text-color);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  cursor: grab;
  touch-action: none;
}

#slider-thumb:active {
  cursor: grabbing;
}

#slider-range {
  display: flex;
  justify-content: space-between;
  margin-top: 8px;
  font-size: 10px;
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
}

/* Vec2: 2D Pad */
#pad-area {
  position: relative;
  width: 100%;
  aspect-ratio: 2 / 1;
  max-height: 120px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 6px;
  cursor: crosshair;
  touch-action: none;
  overflow: hidden;
}

#pad-area::before,
#pad-area::after {
  content: '';
  position: absolute;
  background: rgba(255, 255, 255, 0.1);
  pointer-events: none;
}

#pad-area::before {
  top: 50%;
  left: 0;
  right: 0;
  height: 1px;
}

#pad-area::after {
  left: 50%;
  top: 0;
  bottom: 0;
  width: 1px;
}

#pad-thumb {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 24px;
  height: 24px;
  background: #69db7c;
  border: 2px solid var(--text-color);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  cursor: grab;
  touch-action: none;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

#pad-thumb:active {
  cursor: grabbing;
}

/* Vec3: Gesture-based Pad */
#vec3-pad {
  position: relative;
  width: 100%;
  aspect-ratio: 2 / 1;
  max-height: 140px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 6px;
  cursor: crosshair;
  touch-action: none;
  overflow: hidden;
}

#vec3-pad::before,
#vec3-pad::after {
  content: '';
  position: absolute;
  background: rgba(255, 255, 255, 0.1);
  pointer-events: none;
}

#vec3-pad::before {
  top: 50%;
  left: 0;
  right: 0;
  height: 1px;
}

#vec3-pad::after {
  left: 50%;
  top: 0;
  bottom: 0;
  width: 1px;
}

#vec3-thumb {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 28px;
  height: 28px;
  background: #ffa94d;
  border: 2px solid var(--text-color);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  touch-action: none;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
  transition: background-color 0.15s ease;
}

#vec3-thumb.z-mode {
  background: #da77f2;
}

#vec3-mode-hint {
  position: absolute;
  bottom: 8px;
  right: 8px;
}

#vec3-mode-label {
  font-size: 10px;
  font-weight: 600;
  color: var(--text-muted);
  padding: 4px 8px;
  background: rgba(0, 0, 0, 0.3);
  border: 1px solid transparent;
  border-radius: 3px;
  cursor: pointer;
  transition: color 0.15s ease, border-color 0.15s ease;
}

#vec3-mode-label:active {
  background: rgba(0, 0, 0, 0.5);
}

#vec3-mode-label.z-mode {
  color: #da77f2;
  border-color: rgba(218, 119, 242, 0.3);
}

/* Vec3 Color: HSV */
#color-hsv-wrapper {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

#color-sv-pad {
  position: relative;
  width: 100%;
  aspect-ratio: 2 / 1;
  max-height: 140px;
  border-radius: 6px;
  cursor: crosshair;
  touch-action: none;
  background: linear-gradient(to top, #000, transparent),
              linear-gradient(to right, #fff, transparent);
  background-color: #f00;
}

#color-sv-thumb {
  position: absolute;
  top: 0;
  left: 100%;
  width: 20px;
  height: 20px;
  background: transparent;
  border: 2px solid var(--text-color);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  cursor: grab;
  touch-action: none;
  box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.3);
}

#color-hue-slider {
  position: relative;
  width: 100%;
  height: 20px;
  border-radius: 6px;
  cursor: pointer;
  touch-action: none;
  background: linear-gradient(to right,
    #f00 0%,
    #ff0 17%,
    #0f0 33%,
    #0ff 50%,
    #00f 67%,
    #f0f 83%,
    #f00 100%
  );
}

#color-hue-thumb {
  position: absolute;
  top: 50%;
  left: 0;
  width: 8px;
  height: 24px;
  background: var(--text-color);
  border-radius: 2px;
  transform: translate(-50%, -50%);
  cursor: grab;
  touch-action: none;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.3);
}

/* Mobile */
@media (max-width: 768px) {
  #close-btn {
    top: 12px;
    left: 12px;
  }

  #control-panel {
    bottom: 32px;
  }
}

@media (max-width: 480px) {
  #save-btn {
    bottom: 16px;
    left: 16px;
  }

  #open-btn {
    bottom: 16px;
    right: 16px;
  }

  .ruler-carousel {
    width: 120px;
  }

  .ruler-carousel__item {
    gap: 6px;
  }

  #control-panel {
    width: 84%;
    left: 8%;
  }

  #color-sv-pad {
    max-height: 120px;
  }
}