/* ═══════════════════════════════════════════════════════════════════
   RenDS — Color Picker Composite Component
   ═══════════════════════════════════════════════════════════════════
   A fully accessible, feature-rich color picker with support for:
   - HSV color model (internal) with conversion to/from HEX, RGB, HSL
   - Saturation/brightness canvas area
   - Hue slider
   - Optional alpha/opacity slider
   - Text inputs for manual color entry
   - Preset color swatches
   - EyeDropper API integration (when available)
   - Keyboard navigation and ARIA labels
   - Smooth animations with @starting-style support

   Structure:
   .ren-color-picker (container)
     .ren-color-picker-trigger (button showing current color)
     [popover] .ren-color-picker-dropdown
       .ren-color-picker-saturation (canvas area for S/B)
         .ren-color-picker-saturation-handle (circular cursor)
       .ren-color-picker-hue (horizontal rainbow slider)
         .ren-color-picker-hue-handle (thumb)
       .ren-color-picker-alpha (opacity slider, optional)
         .ren-color-picker-alpha-handle (thumb)
       .ren-color-picker-preview (color display swatch)
       .ren-color-picker-inputs
         .ren-color-picker-hex-input
         .ren-color-picker-channel (R/G/B or H/S/L)
       .ren-color-picker-swatches (preset colors, optional)
       .ren-color-picker-format-toggle (HEX/RGB/HSL switcher)
       .ren-color-picker-eyedropper (screen picker, optional)
   ═══════════════════════════════════════════════════════════════════ */

/* ═══ COLOR PICKER CONTAINER ═══ */
.ren-color-picker {
  position: relative;
  display: inline-flex;
  flex-direction: column;
  gap: var(--space-2);
  font-family: inherit;
}

/* ═══ TRIGGER BUTTON (Shows Current Color) ═══ */
.ren-color-picker-trigger {
  anchor-name: --ren-color-picker-anchor;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  width: 100%;
  min-height: var(--touch-min);
  padding: var(--space-2) var(--space-3);
  font-size: var(--body-size);
  font-family: inherit;
  color: var(--color-text);
  background-color: var(--color-input-bg);
  border: 1px solid var(--color-input-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: var(--transition-tactile);
}

.ren-color-picker-trigger:hover:not(:disabled) {
  background-color: var(--color-input-bg);
  border-color: var(--color-input-border-focus);
}

.ren-color-picker-trigger:focus-visible {
  outline: none;
  border-color: var(--color-input-border-focus);
  box-shadow: 0 0 0 3px var(--color-input-focus-ring);
}

.ren-color-picker-trigger[aria-expanded="true"] {
  border-color: var(--color-input-border-focus);
  box-shadow: 0 0 0 3px var(--color-input-focus-ring);
}

.ren-color-picker-trigger:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

/* Trigger swatch (small colored square) */
.ren-color-picker-trigger-swatch {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  background-color: var(--white);
  background-image: repeating-conic-gradient(
    var(--color-border) 0deg 90deg,
    transparent 90deg 180deg
  ) 50% / 4px 4px;
}

/* Trigger value text */
.ren-color-picker-trigger-value {
  flex: 1;
  text-align: start;
  font-family: var(--font-mono);
  font-size: var(--label-size);
}

/* ═══ DROPDOWN CONTAINER (Popover) ═══ */
.ren-color-picker-dropdown {
  position: absolute;
  position-anchor: --ren-color-picker-anchor;
  position-area: bottom span-all;
  position-try-fallbacks: flip-block, flip-inline, flip-block flip-inline;
  inset: auto;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  width: auto;
  max-width: 300px;
  padding: var(--space-4);
  background-color: var(--color-surface-raised);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  z-index: 50;

  /* Popover API defaults */
  &:popover-open {
    animation: ren-color-picker-open var(--duration-enter) var(--ease-enter);
  }

  @supports (animation-timeline: view()) {
    &:popover-open {
      animation: ren-color-picker-open var(--duration-enter) var(--ease-enter);
      transition-behavior: allow-discrete;
    }

    @starting-style {
      opacity: 0;
      transform: scale(0.95);
    }
  }
}

.ren-color-picker-dropdown[data-side="bottom"],
.ren-color-picker-dropdown:not([data-side]) {
  position-area: bottom span-all;
  margin-block-start: var(--space-2);
  margin-block-end: 0;
  margin-inline: 0;
}

.ren-color-picker-dropdown[data-side="top"] {
  position-area: top span-all;
  margin-block-start: 0;
  margin-block-end: var(--space-2);
  margin-inline: 0;
}

.ren-color-picker-dropdown[data-side="right"] {
  position-area: right span-all;
  margin-block: 0;
  margin-inline-start: var(--space-2);
  margin-inline-end: 0;
}

.ren-color-picker-dropdown[data-side="left"] {
  position-area: left span-all;
  margin-block: 0;
  margin-inline-start: 0;
  margin-inline-end: var(--space-2);
}

@supports not ((anchor-name: --ren-anchor) and
  (position-anchor: --ren-anchor) and
  (position-area: bottom span-all)) {
  .ren-color-picker-dropdown {
    position: absolute;
    inset: auto;
  }
}

@keyframes ren-color-picker-open {
  from {
    opacity: 0;
    transform: scale(0.95);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

/* ═══ SATURATION/BRIGHTNESS AREA ═══ */
.ren-color-picker-saturation {
  position: relative;
  width: 100%;
  aspect-ratio: 1;
  max-width: 240px;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  cursor: crosshair;
  overflow: hidden;
  user-select: none;
  -webkit-user-select: none;
}

/* Canvas for saturation/brightness */
.ren-color-picker-saturation-canvas {
  display: block;
  width: 100%;
  height: 100%;
  border-radius: var(--radius-md);
}

/* Saturation handle (circular cursor) */
.ren-color-picker-saturation-handle {
  position: absolute;
  top: 0;
  left: 0;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  border: 2px solid white;
  box-shadow: 0 0 0 1px rgb(0, 0, 0, 0.3);
  pointer-events: none;
  transform: translate(-50%, -50%);
}

/* ═══ HUE SLIDER ═══ */
.ren-color-picker-hue {
  position: relative;
  width: 100%;
  height: 32px;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  cursor: pointer;
  /* Hue rainbow. Intencionalmente hex literals: son los 6 puntos del espectro
     HSL puros (red→yellow→green→cyan→blue→magenta→red), no colores de UI. */
  background: linear-gradient(
    to right,
    #ff0000 0%,
    #ffff00 16.67%,
    #00ff00 33.33%,
    #00ffff 50%,
    #0000ff 66.67%,
    #ff00ff 83.33%,
    #ff0000 100%
  );
  overflow: hidden;
}

/* Hue slider handle/thumb */
.ren-color-picker-hue-handle {
  position: absolute;
  top: 50%;
  left: 0;
  width: 4px;
  height: 100%;
  background-color: white;
  box-shadow: 0 0 0 1px rgb(0, 0, 0, 0.3);
  pointer-events: none;
  transform: translateY(-50%);
}

/* ═══ ALPHA SLIDER (Optional) ═══ */
.ren-color-picker-alpha {
  position: relative;
  width: 100%;
  height: 32px;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  cursor: pointer;
  overflow: hidden;

  /* Checkerboard pattern for transparency */
  background-image: repeating-conic-gradient(
    var(--color-border) 0deg 90deg,
    transparent 90deg 180deg
  );
  background-size: 8px 8px;
  background-position: 0 0;
}

/* Gradient overlay for alpha */
.ren-color-picker-alpha-gradient {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border-radius: var(--radius-md);
}

/* Alpha slider handle/thumb */
.ren-color-picker-alpha-handle {
  position: absolute;
  top: 50%;
  left: 0;
  width: 4px;
  height: 100%;
  background-color: white;
  box-shadow: 0 0 0 1px rgb(0, 0, 0, 0.3);
  pointer-events: none;
  transform: translateY(-50%);
}

/* ═══ COLOR PREVIEW SWATCH ═══ */
.ren-color-picker-preview {
  display: flex;
  gap: var(--space-2);
  padding: var(--space-3);
  background-color: var(--color-surface);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
}

.ren-color-picker-preview-swatch {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);

  /* Checkerboard for transparency */
  background-image: repeating-conic-gradient(
    var(--color-border) 0deg 90deg,
    transparent 90deg 180deg
  );
  background-size: 4px 4px;
  background-position: 0 0;
}

.ren-color-picker-preview-info {
  display: flex;
  flex-direction: column;
  justify-content: center;
  flex: 1;
}

.ren-color-picker-preview-label {
  font-size: var(--caption-size);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: var(--label-weight);
}

.ren-color-picker-preview-value {
  font-family: var(--font-mono);
  font-size: var(--label-size);
  color: var(--color-text);
  margin-top: var(--space-1);
}

/* ═══ TEXT INPUTS SECTION ═══ */
.ren-color-picker-inputs {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

/* Hex input field */
.ren-color-picker-hex-input {
  width: 100%;
  padding: var(--space-2) var(--space-3);
  font-size: var(--body-size);
  font-family: var(--font-mono);
  color: var(--color-text);
  background-color: var(--color-input-bg);
  border: 1px solid var(--color-input-border);
  border-radius: var(--radius-md);
  transition: var(--transition-tactile);
}

.ren-color-picker-hex-input:focus {
  outline: none;
  border-color: var(--color-input-border-focus);
  box-shadow: 0 0 0 3px var(--color-input-focus-ring);
}

.ren-color-picker-hex-input::placeholder {
  color: var(--color-text-muted);
}

/* Channel inputs container (RGB or HSL) */
.ren-color-picker-channels {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: var(--space-2);
}

/* Individual channel input */
.ren-color-picker-channel {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.ren-color-picker-channel-label {
  font-size: var(--caption-size);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: var(--label-weight);
}

.ren-color-picker-channel-input {
  padding: var(--space-2) var(--space-2);
  font-size: var(--body-size);
  font-family: var(--font-mono);
  color: var(--color-text);
  background-color: var(--color-input-bg);
  border: 1px solid var(--color-input-border);
  border-radius: var(--radius-md);
  text-align: center;
  transition: var(--transition-tactile);
}

.ren-color-picker-channel-input:focus {
  outline: none;
  border-color: var(--color-input-border-focus);
  box-shadow: 0 0 0 3px var(--color-input-focus-ring);
}

.ren-color-picker-channel-input::-webkit-outer-spin-button,
.ren-color-picker-channel-input::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

.ren-color-picker-channel-input[type="number"] {
  -moz-appearance: textfield;
}

/* ═══ FORMAT TOGGLE BUTTON ═══ */
.ren-color-picker-format-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  font-size: var(--label-size);
  font-family: var(--font-mono);
  color: var(--color-text);
  background-color: var(--color-fill);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  white-space: nowrap;
  transition: var(--transition-tactile);
}

.ren-color-picker-format-toggle:hover {
  background-color: var(--color-fill-hover);
  border-color: var(--color-border);
}

.ren-color-picker-format-toggle:focus-visible {
  outline: none;
  border-color: var(--color-input-border-focus);
  box-shadow: 0 0 0 3px var(--color-input-focus-ring);
}

.ren-color-picker-format-toggle:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* ═══ EYEDROPPER BUTTON ═══ */
.ren-color-picker-eyedropper {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  font-size: var(--label-size);
  color: var(--color-text);
  background-color: var(--color-fill);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: var(--transition-tactile);
}

.ren-color-picker-eyedropper:hover {
  background-color: var(--color-fill-hover);
  border-color: var(--color-border);
}

.ren-color-picker-eyedropper:focus-visible {
  outline: none;
  border-color: var(--color-input-border-focus);
  box-shadow: 0 0 0 3px var(--color-input-focus-ring);
}

.ren-color-picker-eyedropper:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.ren-color-picker-eyedropper-icon {
  width: 16px;
  height: 16px;
  display: inline-block;
}

/* ═══ PRESETS/SWATCHES GRID ═══ */
.ren-color-picker-swatches {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(40px, 1fr));
  gap: var(--space-2);
  padding: var(--space-2);
  background-color: var(--color-surface);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
}

.ren-color-picker-swatch {
  position: relative;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  border: 2px solid transparent;
  cursor: pointer;
  transition: var(--transition-tactile);
  background-image: repeating-conic-gradient(
    var(--color-border) 0deg 90deg,
    transparent 90deg 180deg
  );
  background-size: 4px 4px;
  background-position: 0 0;
}

.ren-color-picker-swatch:focus-visible {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 2px var(--color-input-focus-ring);
}

.ren-color-picker-swatch:hover {
  transform: scale(1.05);
  border-color: var(--color-border);
}

.ren-color-picker-swatch[aria-selected="true"] {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 2px var(--color-surface), 0 0 0 4px var(--color-accent);
}

.ren-color-picker-swatch-color {
  position: absolute;
  inset: 0;
  border-radius: var(--radius-md);
}

/* ═══ CONTROLS ROW (Format + Eyedropper) ═══ */
.ren-color-picker-controls {
  display: flex;
  gap: var(--space-2);
}

.ren-color-picker-controls-left {
  flex: 1;
  display: flex;
  gap: var(--space-2);
}

.ren-color-picker-controls-right {
  display: flex;
  gap: var(--space-2);
}

/* ═══ DISABLED STATE ═══ */
.ren-color-picker[disabled],
.ren-color-picker-trigger[disabled] {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

/* ═══ ANIMATIONS & TRANSITIONS ═══ */
@media (prefers-reduced-motion: reduce) {
  .ren-color-picker-dropdown,
  .ren-color-picker-trigger,
  .ren-color-picker-hex-input,
  .ren-color-picker-channel-input,
  .ren-color-picker-format-toggle,
  .ren-color-picker-swatch {
    animation-duration: 0ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0ms !important;
  }
}
/* Appearance API bridge */
.ren-color-picker { inline-size: var(--ren-cp-width, 280px); border-radius: var(--ren-cp-radius, var(--radius-lg)); background: var(--ren-cp-bg, var(--color-surface-overlay)); box-shadow: var(--ren-cp-shadow, var(--shadow-lg)); }
.ren-color-picker .ren-color-picker-swatch { inline-size: var(--ren-cp-swatch-size, 24px); block-size: var(--ren-cp-swatch-size, 24px); }
.ren-color-picker .ren-color-picker-handle { inline-size: var(--ren-cp-handle-size, 16px); block-size: var(--ren-cp-handle-size, 16px); }
.ren-color-picker .ren-color-picker-track { block-size: var(--ren-cp-track-height, 12px); }