/* ========== CSS Filter Generator Tool ========== */
/* Catppuccin Dark Theme CSS Variables */
:root {
  --color-primary: #1e66f5;
  --color-bg-card: #ffffff;
  --color-border: #ccd0da;
  --color-heading: #1e1e2e;
  --color-text: #4c4f69;
  --color-muted: #6c6f85;
  --color-bg-hover: #e6e9ef;
  --color-success: #40a02b;
  --color-error: #d20f39;
  --color-btn-hover: #ccd0da;
  --color-code-bg: #f2f3f5;
  --color-accent-pink: #ea76cb;
  --color-accent-yellow: #df8e1d;
  --color-accent-green: #40a02b;
  --color-accent-peach: #fe640b;
}

.tool-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 24px;
}

.tool-header {
  text-align: center;
  margin-bottom: 24px;
}

.tool-header h1 {
  font-size: 32px;
  font-weight: 800;
  color: var(--color-heading);
  margin-bottom: 8px;
}

.tool-header .tool-desc {
  font-size: 16px;
  color: var(--color-muted);
  max-width: 700px;
  margin: 0 auto;
  line-height: 1.6;
}

/* Toolbar */
.tool-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
  margin-bottom: 16px;
  padding: 14px;
  background: var(--color-bg-card);
  border-radius: 12px;
  border: 1px solid var(--color-border);
}

.tool-btn {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 6px 12px;
  font-size: 12px;
  font-weight: 600;
  background: #e6e9ef;
  color: var(--color-text);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.2s;
  white-space: nowrap;
}

.tool-btn:hover {
  background: var(--color-btn-hover);
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.tool-btn.active {
  background: var(--color-primary);
  color: #ffffff;
  border-color: var(--color-primary);
}

.tool-btn.danger {
  border-color: var(--color-error);
  color: var(--color-error);
}

.tool-btn.danger:hover {
  background: var(--color-error);
  color: #ffffff;
}

.tool-btn.success {
  border-color: var(--color-success);
  color: var(--color-success);
}

.tool-btn.success:hover {
  background: var(--color-success);
  color: #ffffff;
}

.tool-btn.small {
  padding: 3px 8px;
  font-size: 11px;
}

/* Main Layout */
.tool-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-bottom: 20px;
}

/* Settings Panel */
.tool-settings {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 20px;
  max-height: 900px;
  overflow-y: auto;
}

.tool-settings::-webkit-scrollbar {
  width: 6px;
}

.tool-settings::-webkit-scrollbar-track {
  background: transparent;
}

.tool-settings::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: 3px;
}

/* Collapsible Groups */
.collapse-group {
  margin-bottom: 4px;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  overflow: hidden;
}

.collapse-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  font-size: 14px;
  font-weight: 700;
  color: var(--color-heading);
  cursor: pointer;
  user-select: none;
  transition: background 0.2s;
  background: #e6e9ef;
}

.collapse-header:hover {
  background: #e6e9ef;
}

.collapse-header .collapse-icon {
  font-size: 10px;
  transition: transform 0.2s;
  color: var(--color-muted);
}

.collapse-header.collapsed .collapse-icon {
  transform: rotate(-90deg);
}

.collapse-body {
  padding: 12px 14px;
  border-top: 1px solid var(--color-border);
  display: block;
}

.collapse-body.hidden {
  display: none;
}

/* Setting rows */
.setting-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
  flex-wrap: wrap;
}

.setting-row:last-child {
  margin-bottom: 0;
}

.setting-row label {
  font-size: 12px;
  color: var(--color-text);
  min-width: 60px;
  flex-shrink: 0;
}

.setting-row .label-sm {
  min-width: 30px;
  font-size: 11px;
}

.setting-row select,
.setting-row input[type="text"],
.setting-row input[type="number"],
.setting-row input[type="url"] {
  flex: 1;
  padding: 6px 8px;
  border: 1px solid var(--color-border);
  border-radius: 5px;
  font-size: 12px;
  background: #f2f3f5;
  color: var(--color-text);
  min-width: 0;
}

.setting-row select:focus,
.setting-row input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 2px rgba(137,180,250,0.15);
}

.setting-row input[type="color"] {
  width: 30px;
  height: 30px;
  padding: 1px;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  cursor: pointer;
  background: none;
  flex: none;
}

.setting-row input[type="range"] {
  flex: 1;
  accent-color: var(--color-primary);
  min-width: 60px;
}

.range-value {
  font-size: 11px;
  font-weight: 600;
  color: var(--color-primary);
  min-width: 40px;
  text-align: right;
}

.setting-row .color-swatch {
  width: 20px;
  height: 20px;
  border-radius: 3px;
  border: 1px solid var(--color-border);
  flex-shrink: 0;
}

.setting-row .inline-flex {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.setting-row .filter-label {
  min-width: 50px;
  font-size: 11px;
}

/* Filter item with drag handle */
.filter-item {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 8px;
  margin-bottom: 4px;
  background: #e6e9ef;
  border: 1px solid #ccd0da;
  border-radius: 6px;
  transition: all 0.2s;
  cursor: default;
}

.filter-item:hover {
  border-color: var(--color-primary);
}

.filter-item.dragging {
  opacity: 0.5;
  border-color: var(--color-primary);
  border-style: dashed;
}

.filter-item .drag-handle {
  cursor: grab;
  color: var(--color-muted);
  font-size: 14px;
  flex-shrink: 0;
  padding: 0 2px;
  user-select: none;
}

.filter-item .drag-handle:active {
  cursor: grabbing;
}

.filter-item.drag-over {
  border-color: var(--color-accent-yellow);
  border-style: dashed;
  background: rgba(249,226,175,0.08);
}

.filter-item .filter-name {
  font-size: 11px;
  font-weight: 600;
  color: var(--color-text);
  min-width: 55px;
  flex-shrink: 0;
}

.filter-item .filter-controls {
  display: flex;
  align-items: center;
  gap: 4px;
  flex: 1;
}

.filter-item .filter-controls input[type="range"] {
  flex: 1;
  accent-color: var(--color-primary);
  min-width: 50px;
  height: 16px;
}

.filter-item .filter-controls input[type="number"] {
  width: 50px;
  padding: 2px 4px;
  border: 1px solid var(--color-border);
  border-radius: 3px;
  font-size: 10px;
  background: #f2f3f5;
  color: var(--color-text);
  text-align: center;
}

.filter-item .filter-unit {
  font-size: 10px;
  color: var(--color-muted);
  min-width: 12px;
}

.filter-item .filter-enable {
  flex-shrink: 0;
}

.filter-item .filter-enable .toggle-switch {
  width: 24px;
  height: 14px;
}

.filter-item .filter-enable .toggle-slider::before {
  width: 10px;
  height: 10px;
}

.filter-item .filter-enable .toggle-switch input:checked + .toggle-slider::before {
  transform: translateX(10px);
}

/* Drop-shadow specific */
.drop-shadow-controls {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4px;
  padding: 6px;
  background: #f2f3f5;
  border-radius: 4px;
  margin-top: 4px;
  margin-bottom: 4px;
}

.ds-row {
  display: flex;
  align-items: center;
  gap: 4px;
}

.ds-row label {
  font-size: 10px;
  color: var(--color-muted);
  min-width: 14px;
}

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

.ds-row input[type="number"] {
  width: 40px;
  padding: 1px 3px;
  border: 1px solid var(--color-border);
  border-radius: 3px;
  font-size: 10px;
  background: #f2f3f5;
  color: var(--color-text);
  text-align: center;
}

.ds-row .range-value {
  min-width: 30px;
  font-size: 10px;
}

/* Toggle switch */
.toggle-switch {
  position: relative;
  width: 36px;
  height: 20px;
  flex-shrink: 0;
  cursor: pointer;
}

.toggle-switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.toggle-slider {
  position: absolute;
  inset: 0;
  background: #ccd0da;
  border-radius: 20px;
  transition: 0.3s;
}

.toggle-slider::before {
  content: '';
  position: absolute;
  width: 16px;
  height: 16px;
  left: 2px;
  bottom: 2px;
  background: var(--color-muted);
  border-radius: 50%;
  transition: 0.3s;
}

.toggle-switch input:checked + .toggle-slider {
  background: var(--color-primary);
}

.toggle-switch input:checked + .toggle-slider::before {
  transform: translateX(16px);
  background: #f2f3f5;
}

/* Preview Panel */
.tool-preview {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.preset-label {
  font-size: 11px;
  color: var(--color-muted);
  background: #e6e9ef;
  padding: 3px 10px;
  border-radius: 10px;
  border: 1px solid var(--color-border);
}

/* Comparison View */
.comparison-wrapper {
  position: relative;
  width: 100%;
  max-width: 480px;
  aspect-ratio: 4/3;
  background: repeating-conic-gradient(#e6e9ef 0% 25%, #ffffff 0% 50%) 50% / 20px 20px;
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid var(--color-border);
}

.comparison-wrapper img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.comparison-wrapper .img-original {
  z-index: 1;
}

.comparison-wrapper .img-filtered {
  z-index: 2;
}

/* Side-by-side mode */
.comparison-side {
  display: flex;
  gap: 8px;
  width: 100%;
  max-width: 480px;
}

.comparison-side .side-panel {
  flex: 1;
  position: relative;
}

.comparison-side .side-panel img {
  width: 100%;
  aspect-ratio: 4/3;
  object-fit: contain;
  background: repeating-conic-gradient(#e6e9ef 0% 25%, #ffffff 0% 50%) 50% / 20px 20px;
  border-radius: 6px;
  border: 1px solid var(--color-border);
}

.comparison-side .side-label {
  position: absolute;
  top: 6px;
  left: 6px;
  background: rgba(0,0,0,0.7);
  color: var(--color-text);
  font-size: 10px;
  padding: 2px 8px;
  border-radius: 4px;
  z-index: 5;
}

/* Before/after slider mode */
.compare-slider-wrapper {
  position: relative;
  width: 100%;
  max-width: 480px;
  aspect-ratio: 4/3;
  background: repeating-conic-gradient(#e6e9ef 0% 25%, #ffffff 0% 50%) 50% / 20px 20px;
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid var(--color-border);
  user-select: none;
}

.compare-slider-wrapper img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.compare-slider-wrapper .img-original {
  z-index: 1;
}

.compare-slider-wrapper .img-filtered {
  z-index: 2;
  clip-path: inset(0 0 0 50%);
}

.compare-slider-handle {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  width: 4px;
  background: var(--color-primary);
  z-index: 10;
  cursor: ew-resize;
  transform: translateX(-50%);
  box-shadow: 0 0 6px rgba(0,0,0,0.5);
}

.compare-slider-handle::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 24px;
  height: 24px;
  background: var(--color-primary);
  border-radius: 50%;
  box-shadow: 0 0 6px rgba(0,0,0,0.5);
}

.compare-slider-handle::after {
  content: '◀▶';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 10px;
  color: #ffffff;
  z-index: 11;
  line-height: 24px;
}

/* Hover reveal */
.hover-reveal .img-filtered {
  opacity: 1;
  transition: opacity 0.3s;
}

.hover-reveal:hover .img-filtered {
  opacity: 0;
}

/* Multiple preview images grid */
.multi-preview {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 8px;
  width: 100%;
}

.multi-preview .mp-item {
  position: relative;
}

.multi-preview .mp-item img {
  width: 100%;
  aspect-ratio: 1/1;
  object-fit: cover;
  border-radius: 6px;
  border: 1px solid var(--color-border);
  background: repeating-conic-gradient(#e6e9ef 0% 25%, #ffffff 0% 50%) 50% / 20px 20px;
}

.multi-preview .mp-label {
  position: absolute;
  bottom: 4px;
  left: 4px;
  background: rgba(0,0,0,0.7);
  color: var(--color-text);
  font-size: 9px;
  padding: 1px 6px;
  border-radius: 3px;
}

/* Code Output Area */
.code-output-area {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 20px;
  margin-bottom: 16px;
}

.code-output {
  width: 100%;
  min-height: 150px;
  padding: 14px;
  background: var(--color-code-bg);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
  font-size: 12px;
  line-height: 1.6;
  color: #4c4f69;
  resize: vertical;
  tab-size: 2;
  white-space: pre;
  overflow-x: auto;
}

.code-output:focus {
  outline: none;
  border-color: var(--color-primary);
}

.code-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 12px;
  flex-wrap: wrap;
}

.code-actions label {
  font-size: 12px;
  color: var(--color-text);
  display: flex;
  align-items: center;
  gap: 4px;
  cursor: pointer;
}

.code-actions input[type="checkbox"] {
  accent-color: var(--color-primary);
}

.code-output-header {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
}

.code-output-header .code-tab-btns {
  display: flex;
  gap: 4px;
}

.code-tab-btn {
  padding: 4px 12px;
  font-size: 12px;
  font-weight: 600;
  background: #e6e9ef;
  color: var(--color-muted);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.2s;
}

.code-tab-btn:hover {
  color: var(--color-text);
}

.code-tab-btn.active {
  background: var(--color-code-bg);
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.copy-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 16px;
  font-size: 12px;
  font-weight: 600;
  background: var(--color-primary);
  color: #ffffff;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.2s;
  margin-left: auto;
}

.copy-btn:hover {
  opacity: 0.85;
  transform: translateY(-1px);
}

/* Status */
.status-box {
  padding: 10px 16px;
  border-radius: 8px;
  margin-bottom: 12px;
  font-size: 13px;
  display: none;
}

.status-box.show {
  display: block;
}

.status-success {
  background: rgba(166,227,161,0.1);
  border: 1px solid var(--color-success);
  color: var(--color-success);
}

.status-error {
  background: rgba(243,139,168,0.1);
  border: 1px solid var(--color-error);
  color: var(--color-error);
}

.status-info {
  background: rgba(137,180,250,0.1);
  border: 1px solid var(--color-primary);
  color: var(--color-primary);
}

/* Sample image thumbnails */
.sample-strip {
  display: flex;
  gap: 6px;
  margin-bottom: 10px;
  flex-wrap: wrap;
}

.sample-thumb {
  width: 48px;
  height: 48px;
  border-radius: 6px;
  border: 2px solid var(--color-border);
  cursor: pointer;
  overflow: hidden;
  transition: all 0.2s;
  background: #f2f3f5;
}

.sample-thumb:hover {
  border-color: var(--color-primary);
  transform: scale(1.05);
}

.sample-thumb.active {
  border-color: var(--color-primary);
  box-shadow: 0 0 8px rgba(137,180,250,0.3);
}

.sample-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* Image upload area */
.upload-area {
  border: 2px dashed var(--color-border);
  border-radius: 8px;
  padding: 16px;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s;
  background: #f2f3f5;
  margin-bottom: 8px;
}

.upload-area:hover,
.upload-area.drag-over {
  border-color: var(--color-primary);
  background: rgba(137,180,250,0.05);
}

.upload-area .upload-icon {
  font-size: 24px;
  color: var(--color-muted);
  margin-bottom: 4px;
}

.upload-area .upload-text {
  font-size: 11px;
  color: var(--color-muted);
}

.upload-area .upload-hint {
  font-size: 10px;
  color: var(--color-muted);
  margin-top: 4px;
  opacity: 0.7;
}

/* URL input row */
.url-input-row {
  display: flex;
  gap: 6px;
  margin-bottom: 8px;
}

.url-input-row input {
  flex: 1;
  padding: 6px 8px;
  border: 1px solid var(--color-border);
  border-radius: 5px;
  font-size: 12px;
  background: #f2f3f5;
  color: var(--color-text);
}

.url-input-row input:focus {
  outline: none;
  border-color: var(--color-primary);
}

.url-input-row button {
  padding: 6px 12px;
  font-size: 12px;
  font-weight: 600;
  background: var(--color-primary);
  color: #ffffff;
  border: none;
  border-radius: 5px;
  cursor: pointer;
}

/* Preset filter buttons */
.preset-filter-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin-bottom: 8px;
}

.preset-filter-btn {
  padding: 4px 10px;
  font-size: 11px;
  font-weight: 600;
  background: #e6e9ef;
  color: var(--color-text);
  border: 1px solid var(--color-border);
  border-radius: 14px;
  cursor: pointer;
  transition: all 0.2s;
}

.preset-filter-btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.preset-filter-btn.active {
  background: var(--color-primary);
  color: #ffffff;
  border-color: var(--color-primary);
}

/* Sub group */
.sub-group {
  padding: 8px;
  margin-bottom: 8px;
  background: #e6e9ef;
  border-radius: 6px;
  border: 1px solid #ccd0da;
}

.sub-group-title {
  font-size: 11px;
  font-weight: 600;
  color: var(--color-muted);
  margin-bottom: 6px;
}

/* Scheme management */
.scheme-row {
  display: flex;
  gap: 6px;
  margin-bottom: 6px;
}

.scheme-row input {
  flex: 1;
  padding: 5px 8px;
  border: 1px solid var(--color-border);
  border-radius: 5px;
  font-size: 12px;
  background: #f2f3f5;
  color: var(--color-text);
}

.scheme-row select {
  flex: 1;
  padding: 5px 8px;
  border: 1px solid var(--color-border);
  border-radius: 5px;
  font-size: 12px;
  background: #f2f3f5;
  color: var(--color-text);
}

/* Keyboard shortcut hints */
.kbd {
  display: inline-block;
  padding: 2px 5px;
  font-size: 10px;
  font-family: 'Consolas', 'Monaco', monospace;
  background: #f2f3f5;
  border: 1px solid var(--color-border);
  border-radius: 3px;
  color: var(--color-muted);
}

.shortcut-hint {
  font-size: 10px;
  color: var(--color-muted);
  margin-top: 8px;
  text-align: center;
}

.shortcut-hint span {
  margin: 0 6px;
}

/* Animation preview */
.anim-preview-btn {
  padding: 6px 14px;
  font-size: 12px;
  font-weight: 600;
  background: var(--color-accent-pink);
  color: #ffffff;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.2s;
}

.anim-preview-btn:hover {
  opacity: 0.85;
}

.anim-preview-btn.active {
  background: var(--color-accent-yellow);
}

/* Color filter converter */
.color-converter {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 8px;
  align-items: end;
}

.color-converter .cc-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.color-converter .cc-item label {
  font-size: 10px;
  color: var(--color-muted);
}

.color-converter .cc-item input[type="color"] {
  width: 100%;
  height: 32px;
}

/* Multi-image management */
.multi-controls {
  display: flex;
  gap: 6px;
  margin-bottom: 8px;
}

/* Info Section */
.tool-info {
  margin-top: 32px;
  padding: 24px;
  background: var(--color-bg-card);
  border-radius: 12px;
  border: 1px solid var(--color-border);
}

.tool-info h2 {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-heading);
  margin-bottom: 16px;
}

.tool-info h3 {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-heading);
  margin: 20px 0 12px;
}

.tool-info p {
  font-size: 15px;
  color: var(--color-text);
  line-height: 1.8;
  margin-bottom: 12px;
}

.tool-info ul {
  margin: 0 0 16px 24px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-text);
}

.tool-info li {
  margin-bottom: 6px;
}

.tool-info code {
  background: #e6e9ef;
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 13px;
  font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
  color: #f5c2e7;
}

.tool-info .info-tip {
  padding: 12px 16px;
  background: rgba(137,180,250,0.1);
  border-radius: 8px;
  color: var(--color-primary);
  margin-top: 16px;
}

/* Responsive */
@media (max-width: 900px) {
  .tool-layout {
    grid-template-columns: 1fr;
  }
  .tool-container {
    padding: 16px;
  }
  .tool-settings {
    max-height: none;
  }
  .multi-preview {
    grid-template-columns: 1fr 1fr;
  }
  .color-converter {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 600px) {
  .tool-header h1 {
    font-size: 24px;
  }
  .tool-container {
    padding: 12px;
  }
  .multi-preview {
    grid-template-columns: 1fr;
  }
  .comparison-side {
    flex-direction: column;
  }
  .setting-row {
    flex-wrap: wrap;
  }
  .tool-toolbar {
    gap: 5px;
    padding: 10px;
  }
  .tool-btn {
    padding: 4px 8px;
    font-size: 11px;
  }
  .code-actions {
    flex-direction: column;
    align-items: stretch;
  }
  .copy-btn {
    margin-left: 0;
  }
}