/* ============================================================
   style.css — Kaleidoscope Art Studio Dark Theme
   ============================================================ */

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

/* ---- CSS Custom Properties ---- */
:root {
  --bg-primary: #0e0b1a;
  --bg-secondary: #161226;
  --bg-panel: rgba(20, 16, 38, 0.85);
  --bg-section: rgba(30, 24, 56, 0.6);
  --bg-input: rgba(40, 32, 72, 0.5);
  --text-primary: #e8e4f0;
  --text-secondary: #9a92b0;
  --text-muted: #5e5678;
  --accent: #a855f7;
  --accent-glow: rgba(168, 85, 247, 0.4);
  --accent2: #6366f1;
  --accent3: #ec4899;
  --border: rgba(255, 255, 255, 0.06);
  --border-hover: rgba(168, 85, 247, 0.3);
  --radius: 10px;
  --radius-sm: 6px;
  --panel-width: 280px;
  --toolbar-height: 48px;
  --transition: 0.2s ease;
}

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

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 13px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

/* ---- Layout ---- */
#app {
  display: flex;
  flex-direction: column;
  width: 100%;
  height: 100%;
}

#toolbar {
  display: flex;
  align-items: center;
  gap: 4px;
  height: var(--toolbar-height);
  padding: 0 16px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  z-index: 100;
  flex-shrink: 0;
}

#workspace {
  display: flex;
  flex: 1;
  overflow: hidden;
}

#main-area {
  flex: 1;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

#canvas-container {
  position: relative;
}

#canvas-container canvas {
  display: block;
}

/* ---- Control Panel ---- */
#control-panel {
  width: var(--panel-width);
  height: 100%;
  background: var(--bg-panel);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-left: 1px solid var(--border);
  overflow-y: auto;
  overflow-x: hidden;
  flex-shrink: 0;
  padding: 16px 12px;
  z-index: 50;
}

#control-panel::-webkit-scrollbar {
  width: 4px;
}
#control-panel::-webkit-scrollbar-track {
  background: transparent;
}
#control-panel::-webkit-scrollbar-thumb {
  background: rgba(168, 85, 247, 0.3);
  border-radius: 2px;
}

.panel-title {
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}

/* ---- Panel Sections ---- */
.panel-section {
  margin-bottom: 8px;
  border-radius: var(--radius);
  overflow: hidden;
}

.section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 12px;
  background: var(--bg-section);
  cursor: pointer;
  font-weight: 500;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--text-secondary);
  border-radius: var(--radius);
  transition: background var(--transition), color var(--transition);
  user-select: none;
}

.section-header:hover {
  background: rgba(40, 32, 72, 0.8);
  color: var(--text-primary);
}

.section-toggle {
  font-size: 10px;
  color: var(--text-muted);
}

.section-content {
  padding: 10px 8px;
}

.panel-section.collapsed .section-content {
  display: none;
}

/* ---- Control Row ---- */
.control-row {
  margin-bottom: 10px;
}

.slider-label-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 4px;
}

.slider-label-row label {
  font-size: 11px;
  color: var(--text-secondary);
  font-weight: 400;
}

.slider-value {
  font-size: 11px;
  color: var(--accent);
  font-weight: 500;
  font-variant-numeric: tabular-nums;
}

/* ---- Custom Slider ---- */
.control-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 4px;
  background: var(--bg-input);
  border-radius: 2px;
  outline: none;
  cursor: pointer;
}

.control-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid rgba(255, 255, 255, 0.2);
  cursor: pointer;
  box-shadow: 0 0 8px var(--accent-glow);
  transition: transform var(--transition), box-shadow var(--transition);
}

.control-slider::-webkit-slider-thumb:hover {
  transform: scale(1.2);
  box-shadow: 0 0 14px var(--accent-glow);
}

.control-slider::-moz-range-thumb {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid rgba(255, 255, 255, 0.2);
  cursor: pointer;
  box-shadow: 0 0 8px var(--accent-glow);
}

/* ---- Toggle Switch ---- */
.toggle-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.toggle-row label {
  font-size: 11px;
  color: var(--text-secondary);
}

.toggle-switch {
  width: 36px;
  height: 20px;
  background: var(--bg-input);
  border-radius: 10px;
  cursor: pointer;
  position: relative;
  transition: background var(--transition);
  border: 1px solid var(--border);
}

.toggle-switch.active {
  background: var(--accent);
  border-color: transparent;
}

.toggle-knob {
  width: 14px;
  height: 14px;
  background: white;
  border-radius: 50%;
  position: absolute;
  top: 2px;
  left: 2px;
  transition: transform var(--transition);
  box-shadow: 0 1px 3px rgba(0,0,0,0.3);
}

.toggle-switch.active .toggle-knob {
  transform: translateX(16px);
}

/* ---- Brush Grid ---- */
.brush-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4px;
  margin-bottom: 12px;
}

.brush-btn {
  padding: 6px 4px;
  font-size: 10px;
  font-weight: 500;
  background: var(--bg-input);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition);
  text-align: center;
}

.brush-btn:hover {
  background: rgba(168, 85, 247, 0.15);
  border-color: var(--border-hover);
  color: var(--text-primary);
}

.brush-btn.active {
  background: rgba(168, 85, 247, 0.25);
  border-color: var(--accent);
  color: white;
  box-shadow: 0 0 8px var(--accent-glow);
}

/* ---- Color Picker ---- */
.color-picker-row {
  display: flex;
  align-items: center;
  gap: 10px;
}

.color-picker-row label {
  font-size: 11px;
  color: var(--text-secondary);
}

input[type="color"] {
  -webkit-appearance: none;
  appearance: none;
  width: 40px;
  height: 28px;
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  background: transparent;
  padding: 0;
}

input[type="color"]::-webkit-color-swatch-wrapper {
  padding: 2px;
}

input[type="color"]::-webkit-color-swatch {
  border: none;
  border-radius: 3px;
}

/* ---- Select ---- */
.control-select {
  width: 100%;
  padding: 6px 8px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  color: var(--text-primary);
  border-radius: var(--radius-sm);
  font-size: 11px;
  font-family: inherit;
  cursor: pointer;
  outline: none;
  transition: border-color var(--transition);
}

.control-select:hover,
.control-select:focus {
  border-color: var(--border-hover);
}

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

/* ---- Palette Presets ---- */
.palette-presets {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-top: 10px;
}

.palette-swatch {
  display: flex;
  gap: 3px;
  padding: 6px 8px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition);
}

.palette-swatch:hover {
  border-color: var(--border-hover);
  background: rgba(168, 85, 247, 0.1);
}

.palette-swatch.active {
  border-color: var(--accent);
  box-shadow: 0 0 6px var(--accent-glow);
}

.palette-dot {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  flex-shrink: 0;
}

/* ---- Generative Grid ---- */
.gen-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
}

.gen-btn {
  padding: 10px 6px;
  font-size: 11px;
  font-weight: 500;
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.15), rgba(168, 85, 247, 0.15));
  border: 1px solid rgba(168, 85, 247, 0.2);
  color: var(--text-primary);
  border-radius: var(--radius);
  cursor: pointer;
  transition: all var(--transition);
  text-align: center;
}

.gen-btn:hover {
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.3), rgba(168, 85, 247, 0.3));
  border-color: var(--accent);
  box-shadow: 0 0 12px var(--accent-glow);
  transform: translateY(-1px);
}

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

/* ---- Canvas Buttons ---- */
.canvas-btn {
  width: 100%;
  padding: 8px;
  margin-bottom: 6px;
  font-size: 11px;
  font-weight: 500;
  background: var(--bg-input);
  border: 1px solid var(--border);
  color: var(--text-primary);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition);
}

.canvas-btn:hover {
  background: rgba(168, 85, 247, 0.15);
  border-color: var(--border-hover);
}

.sub-header {
  font-size: 11px;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin: 6px 0 8px;
}

hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 12px 0;
}

/* ---- Toolbar Buttons ---- */
.toolbar-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  background: transparent;
  border: 1px solid transparent;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-family: inherit;
  font-size: 12px;
  transition: all var(--transition);
  white-space: nowrap;
}

.toolbar-btn:hover {
  background: rgba(168, 85, 247, 0.1);
  border-color: var(--border-hover);
  color: var(--text-primary);
}

.toolbar-btn:active {
  background: rgba(168, 85, 247, 0.2);
}

.tb-icon {
  font-size: 16px;
  line-height: 1;
}

.tb-label {
  font-size: 11px;
  font-weight: 500;
}

/* ---- Responsive ---- */
@media (max-width: 900px) {
  :root {
    --panel-width: 240px;
  }
  .tb-label {
    display: none;
  }
  .toolbar-btn {
    padding: 6px 8px;
  }
}

@media (max-width: 640px) {
  #workspace {
    flex-direction: column-reverse;
  }
  #control-panel {
    width: 100%;
    height: auto;
    max-height: 40vh;
    border-left: none;
    border-top: 1px solid var(--border);
  }
  :root {
    --panel-width: 100%;
  }
}

/* ---- No-select on canvas area ---- */
#main-area {
  user-select: none;
  -webkit-user-select: none;
}

/* ---- Scrollbar for body (disabled) ---- */
body::-webkit-scrollbar {
  display: none;
}