:root {
  --bg-dark: #1e1e1e;
  --bg-medium: #2a2a2a;
  --bg-light: #2d2d2d;
  --accent: #ebe717;
  --accent-hover: #f5f052;
  --text: #ffffff;
  --text-muted: #aaaaaa;
  --border-color: #444;
  --border-radius: 8px;

  /* Color palette */
  --color-active: #ebe717;
  --color-primary: #3D5B58;
  --color-secondary: #373A36;
  --color-positive: #406B47;
  --color-warning: #892626;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 0;
  font-family: 'Roboto Condensed', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg-dark);
  color: var(--text);
  line-height: 1.6;
}

.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 1rem;
}

.app-layout {
  display: grid;
  grid-template-columns: 400px 1fr;
  gap: 2rem;
}

/* Controls Panel */
.controls-panel {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.control-group {
  background: var(--bg-medium);
  padding: 1.5rem;
  border-radius: var(--border-radius);
  border: 1px solid var(--border-color);
}

.control-group h2 {
  margin: 0 0 1rem;
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--text);
}

.toggle-buttons {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

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

.toggle-buttons button {
  flex: 1;
  padding: 0.75rem 1rem;
  background: var(--color-primary);
  color: white;
  border: 2px solid var(--color-primary);
  border-radius: var(--border-radius);
  cursor: pointer;
  font-family: 'Roboto Condensed', sans-serif;
  font-size: 0.95rem;
  font-weight: 700;
  transition: all 0.2s;
}

.toggle-buttons button:hover {
  background: var(--color-positive);
  border-color: var(--color-positive);
}

.toggle-buttons button.active {
  background: var(--color-active);
  border-color: var(--color-active);
  color: var(--color-primary);
}

/* Icon Library */
.icon-library {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.icon-section {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  background: var(--bg-dark);
  border-radius: var(--border-radius);
  border: 1px solid var(--border-color);
  padding: 0.75rem;
}

.icon-section-header {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: 0.2px;
}

#iconSearch {
  width: 100%;
  padding: 0.6rem;
  background: var(--bg-light);
  color: var(--text);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  font-size: 0.95rem;
}

#iconSearch:focus {
  outline: none;
  border-color: var(--accent);
}

.icon-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(50px, 1fr));
  gap: 6px;
  max-height: 220px;
  overflow-y: auto;
  padding: 8px;
  background: var(--bg-medium);
  border-radius: 6px;
  border: 1px solid var(--border-color);
}

.custom-icon-grid {
  max-height: 140px;
}

.icon-empty {
  grid-column: 1 / -1;
  padding: 1.5rem 1rem;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.95rem;
}

.icon-grid::-webkit-scrollbar {
  width: 8px;
}

.icon-grid::-webkit-scrollbar-track {
  background: var(--bg-dark);
}

.icon-grid::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 4px;
}

.icon-grid::-webkit-scrollbar-thumb:hover {
  background: #555;
}

.icon-item {
  width: 50px;
  height: 50px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  cursor: pointer;
  border: 2px solid transparent;
  border-radius: 4px;
  transition: all 0.15s;
}

.icon-item.fa-icon {
  font-family: 'Font Awesome 6 Free' !important;
  font-weight: 900 !important;
}

.icon-item:hover {
  background: rgba(255, 255, 255, 0.1);
  transform: scale(1.1);
}

.icon-item.selected {
  border-color: var(--accent);
  background: rgba(235, 231, 23, 0.2);
}

.icon-item.image-icon img {
  width: 70%;
  height: 70%;
  object-fit: contain;
  filter: brightness(0) invert(1);
  pointer-events: none;
}

.custom-color-toggle {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 500;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.custom-color-toggle input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.custom-color-toggle .toggle-track {
  width: 42px;
  height: 22px;
  border-radius: 999px;
  background: var(--bg-light);
  border: 1px solid var(--border-color);
  display: inline-flex;
  align-items: center;
  padding: 2px;
  transition: background 0.2s ease, border-color 0.2s ease;
}

.custom-color-toggle .toggle-thumb {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--text-muted);
  transform: translateX(0);
  transition: transform 0.2s ease, background 0.2s ease;
}

.custom-color-toggle input:checked + .toggle-track {
  background: var(--color-primary);
  border-color: var(--color-primary);
}

.custom-color-toggle input:checked + .toggle-track .toggle-thumb {
  transform: translateX(20px);
  background: var(--accent);
}

.custom-color-toggle input:focus-visible + .toggle-track {
  box-shadow: 0 0 0 3px rgba(235, 231, 23, 0.35);
}

.custom-color-toggle .toggle-label {
  line-height: 1.2;
}

.custom-icon-grid .icon-item.image-icon img {
  filter: none;
}

/* Upload Area */
.upload-area {
  padding: 1rem 0;
}

.upload-area.hidden {
  display: none;
}

.upload-label {
  display: block;
  padding: 2rem;
  background: var(--bg-dark);
  border: 2px dashed var(--border-color);
  border-radius: var(--border-radius);
  text-align: center;
  cursor: pointer;
  transition: all 0.2s;
}

.upload-label:hover {
  border-color: var(--accent);
  background: var(--bg-light);
}

.upload-text {
  display: block;
  font-size: 1rem;
  color: var(--text-muted);
}

#iconUpload {
  display: none;
}

/* Control Row */
.control-row {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 0.75rem;
}

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

.control-row label {
  flex: 1;
  font-size: 0.95rem;
  color: var(--text-muted);
}

input[type="color"] {
  width: 50px;
  height: 35px;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  cursor: pointer;
  background: none;
}

input[type="text"],
textarea,
select {
  padding: 0.75rem;
  background: var(--bg-dark);
  color: var(--text);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  font-size: 0.95rem;
  width: 100%;
  font-family: 'Roboto Condensed', sans-serif;
  resize: vertical;
}

input[type="text"]:focus,
textarea:focus,
select:focus {
  outline: none;
  border-color: var(--accent);
}

textarea {
  min-height: 80px;
}

input[type="range"] {
  flex: 1;
  height: 6px;
  border-radius: 3px;
  background: var(--bg-dark);
  outline: none;
  -webkit-appearance: none;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
}

input[type="range"]::-moz-range-thumb {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  border: none;
}

.text-controls {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-top: 1rem;
}

/* Preview Panel */
.preview-panel {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.preview-panel h2 {
  margin: 0;
  font-size: 1.5rem;
  font-weight: 600;
}

.color-previews {
  display: flex;
  gap: 12px;
  justify-content: center;
  padding: 1rem 0;
}

.color-btn {
  width: 50px;
  height: 50px;
  border: 3px solid transparent;
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: all 0.2s;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
  font-family: 'Roboto Condensed', sans-serif;
}

.color-btn:hover {
  transform: scale(1.1);
}

.color-btn.active {
  border-color: white;
  box-shadow: 0 0 12px rgba(255, 255, 255, 0.6);
  transform: scale(1.1);
}

.canvas-container {
  display: flex;
  justify-content: center;
  align-items: center;
  background: #1a1a1a;
  padding: 3rem;
  border-radius: var(--border-radius);
  box-shadow: inset 0 2px 8px rgba(0, 0, 0, 0.3);
}

#previewCanvas {
  width: 288px;
  height: 288px;
  border: 2px solid var(--border-color);
  border-radius: 36px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
  image-rendering: -webkit-optimize-contrast;
  image-rendering: crisp-edges;
}

.export-controls {
  display: flex;
  gap: 1rem;
  align-items: center;
  padding: 1.5rem;
  background: var(--bg-medium);
  border-radius: var(--border-radius);
  border: 1px solid var(--border-color);
}

.btn-primary {
  flex: 1;
  padding: 1rem 2rem;
  background: var(--accent);
  color: var(--color-primary);
  border: none;
  border-radius: var(--border-radius);
  font-family: 'Roboto Condensed', sans-serif;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
}

.btn-primary i {
  font-size: 1.25rem;
}

.btn-primary:hover {
  background: var(--accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(235, 231, 23, 0.4);
}

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

.site-footer {
  margin-top: 2.5rem;
  padding: 1.5rem 0 2rem;
  text-align: center;
}

.footer-link {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--text-muted);
  text-decoration: none;
  font-weight: 600;
  letter-spacing: 0.2px;
  transition: color 0.2s ease, transform 0.2s ease;
}

.footer-link i {
  font-size: 1.2rem;
}

.footer-link:hover {
  color: var(--accent);
  transform: translateY(-1px);
}

/* Responsive Design */
@media (max-width: 1024px) {
  .app-layout {
    grid-template-columns: 1fr;
  }

  .controls-panel {
    order: 2;
  }

  .preview-panel {
    order: 1;
  }
}

@media (max-width: 640px) {
  header h1 {
    font-size: 1.8rem;
  }

  .color-previews {
    gap: 8px;
  }

  .color-btn {
    width: 40px;
    height: 40px;
  }

  .thumbnail-previews {
    grid-template-columns: repeat(3, 1fr);
  }

  .canvas-container {
    padding: 2rem 1rem;
  }

  #previewCanvas {
    max-width: 100%;
    height: auto;
    width: auto;
  }

  .thumbnail {
    width: 100%;
    height: auto;
    aspect-ratio: 1;
  }

  .export-controls {
    flex-direction: column;
  }
}