:root, [data-theme="dark"] {
  --bg-dark: #0f1115;
  --sidebar-bg: #16181d;
  --panel-bg: #1e2128;
  --border-color: #2e323a;
  --text-main: #f0f2f5;
  --text-muted: #9aa0a6;
  --primary: #5c6bc0;
  --primary-hover: #7986cb;
  --accent: #00e676;
  --danger: #ff5252;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --shadow-sm: 0 4px 6px rgba(0,0,0,0.1);
  --shadow-md: 0 8px 15px rgba(0,0,0,0.2);
  --shadow-glow: 0 0 20px rgba(92, 107, 192, 0.2);
}

[data-theme="light"] {
  --bg-dark: #f0f2f5;
  --sidebar-bg: #ffffff;
  --panel-bg: #f8f9fa;
  --border-color: #e2e8f0;
  --text-main: #1e293b;
  --text-muted: #64748b;
  --primary: #4f46e5;
  --primary-hover: #4338ca;
  --accent: #10b981;
  --danger: #ef4444;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.05);
  --shadow-glow: 0 0 15px rgba(79, 70, 229, 0.2);
}

/* Base Fixes for Outline Buttons */
.btn.outline {
  color: var(--text-main); /* Ensure visibility */
  border-color: var(--border-color);
}
.btn.outline:hover {
  background: rgba(100, 116, 139, 0.1); /* Neutral hover for both modes */
  color: var(--text-main);
}
[data-theme="light"] .brand h1 { color: var(--text-main); }
[data-theme="light"] .panel-header h3 { color: var(--text-main); }
[data-theme="light"] .panel-header { background: rgba(0,0,0,0.03); }
[data-theme="light"] .checkered-bg {
  background-image: 
    linear-gradient(45deg, #e2e8f0 25%, transparent 25%), 
    linear-gradient(-45deg, #e2e8f0 25%, transparent 25%), 
    linear-gradient(45deg, transparent 75%, #e2e8f0 75%), 
    linear-gradient(-45deg, transparent 75%, #e2e8f0 75%);
}
[data-theme="light"] .visibility-toggle:hover {
  background: rgba(0,0,0,0.05);
}

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

body {
  font-family: 'Inter', -apple-system, sans-serif;
  background-color: var(--bg-dark);
  color: var(--text-main);
  height: 100vh;
  overflow: hidden;
}

.app-container {
  display: flex;
  height: 100vh;
  width: 100vw;
}

/* Sidebars Base */
.sidebar {
  background-color: var(--sidebar-bg);
  display: flex;
  flex-direction: column;
  overflow: hidden; /* Hide overflow on the main container */
  z-index: 10;
  box-shadow: var(--shadow-sm);
}

.sidebar-header {
  padding: 16px;
  flex-shrink: 0;
  background-color: var(--sidebar-bg);
  z-index: 20;
  border-bottom: 1px solid var(--border-color);
}

.sidebar-content {
  flex: 1;
  overflow-y: auto;
  padding: 0 16px 16px 16px;
  scrollbar-width: thin;
}

.sidebar-content::-webkit-scrollbar {
  width: 6px;
}

.sidebar-content::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 10px;
}

.left-sidebar {
  width: 320px;
  border-right: 1px solid var(--border-color);
}

.right-sidebar {
  width: 300px;
  border-left: 1px solid var(--border-color);
}

.brand { margin-bottom: 0; }
.brand h1 { font-size: 20px; font-weight: 700; color: #fff; letter-spacing: -0.5px; }
.brand p { color: var(--primary); font-size: 13px; font-weight: 500; text-transform: uppercase; letter-spacing: 1px; margin-top: 2px; }

.section-title {
  font-size: 12px;
  text-transform: uppercase;
  color: var(--text-muted);
  letter-spacing: 1px;
  margin-bottom: 12px;
  font-weight: 600;
}

.control-group {
  background: var(--panel-bg);
  border-radius: var(--radius-lg);
  padding: 14px;
  margin-bottom: 12px;
  border: 1px solid var(--border-color);
}
.control-group h3 {
  font-size: 13px;
  text-transform: uppercase;
  color: var(--text-muted);
  letter-spacing: 1px;
  margin-bottom: 8px;
  font-weight: 600;
}

.control-item { margin-bottom: 12px; }
.control-item:last-child { margin-bottom: 0; }

.control-header {
  display: flex;
  justify-content: space-between;
  margin-bottom: 8px;
  font-size: 13px;
  font-weight: 500;
  color: #ccc;
}

/* Sliders */
input[type="range"] {
  -webkit-appearance: none;
  width: 100%;
  height: 6px;
  background: var(--border-color);
  border-radius: 3px;
  outline: none;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--primary);
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s;
}
input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.2);
  box-shadow: 0 0 10px var(--primary);
}

/* Inputs */
input[type="number"] {
  width: 100%;
  background: var(--bg-dark);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 8px 12px;
  border-radius: var(--radius-md);
  font-family: inherit;
  outline: none;
  transition: border-color 0.2s;
}
input[type="number"]:focus {
  border-color: var(--primary);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: inherit;
  font-weight: 600;
  font-size: 14px;
  border: none;
  border-radius: var(--radius-md);
  padding: 10px 16px;
  cursor: pointer;
  transition: all 0.2s;
}
.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}
.btn.primary { background: var(--primary); color: white; }
.btn.primary:not(:disabled):hover { background: var(--primary-hover); transform: translateY(-1px); box-shadow: var(--shadow-glow); }
.btn.primary:not(:disabled):active { transform: translateY(1px); }

.btn.secondary { background: var(--border-color); color: var(--text-main); }
.btn.secondary:not(:disabled):hover { background: #3a3f4a; }

.btn.outline { background: transparent; border: 1px solid var(--border-color); }
.btn.outline:not(:disabled):hover { border-color: var(--text-muted); background: rgba(255,255,255,0.05); }

.btn.block-btn { width: 100%; }
.mt-2 { margin-top: 4px; }
.mt-3 { margin-top: 8px; }
.mt-4 { margin-top: 12px; }

.btn.compact-btn {
  padding: 4px 8px;
  font-size: 11px;
  margin-top: 0 !important;
}

/* SVG Controls Specifics */
.icon-btn { padding: 8px 12px; width: 100%; justify-content: flex-start; margin-bottom: 16px;}
.icon-btn-small { padding: 6px; border-radius: 6px; background: rgba(255,255,255,0.05); }
.icon { width: 18px; height: 18px; }

.color-controls { display: flex; gap: 12px; margin-bottom: 16px; }
.color-picker-wrapper { flex: 1; display: flex; flex-direction: column; gap: 6px; }
.color-picker-wrapper label { font-size: 12px; color: var(--text-muted); }
input[type="color"] {
  -webkit-appearance: none;
  border: none;
  width: 100%;
  height: 36px;
  border-radius: var(--radius-md);
  cursor: pointer;
  background: none;
}
input[type="color"]::-webkit-color-swatch-wrapper { padding: 0; }
input[type="color"]::-webkit-color-swatch { border: 1px solid var(--border-color); border-radius: var(--radius-md); }

/* Layers */
.layers-panel { margin-top: 16px; }
.layers-panel > label { font-size: 13px; color: var(--text-muted); display: block; margin-bottom: 8px; }
.layers-list {
  background: var(--bg-dark);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  max-height: 180px;
  overflow-y: auto;
  padding: 8px;
}
.layer-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 8px;
  font-size: 13px;
  border-radius: 4px;
  cursor: pointer;
  transition: background-color 0.2s, color 0.2s;
}
.layer-item:hover { background: var(--panel-bg); }
.layer-item.selected {
  background: var(--primary);
  color: #ffffff;
}
.layer-item.selected .visibility-toggle {
  color: #ffffff;
}
.layer-item.selected:hover { background: var(--primary-hover); }

/* Control States */
.disabled-control {
  opacity: 0.4;
  pointer-events: none;
  filter: grayscale(100%);
  transition: opacity 0.3s, filter 0.3s;
}

/* Canvas element hover highlight */
#svgPreview svg path.hover-highlight,
#svgPreview svg g.hover-highlight > path {
  outline: 2.5px dashed #00bfff;
  outline-offset: 2px;
  filter: drop-shadow(0 0 6px rgba(0, 191, 255, 0.7));
  cursor: pointer;
}

/* Canvas element selected (persistent after click) */
#svgPreview svg path.canvas-selected,
#svgPreview svg g.canvas-selected > path {
  outline: 2.5px solid var(--primary);
  outline-offset: 2px;
  filter: drop-shadow(0 0 8px rgba(124, 58, 237, 0.8));
}

/* Collapsible group toggle */
.group-toggle {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 0 2px;
  font-size: 12px;
  line-height: 1;
  display: inline-flex;
  align-items: center;
  flex-shrink: 0;
  transition: transform 0.15s;
}
.group-toggle:hover { color: var(--text-main); }
.group-toggle.collapsed { transform: rotate(-90deg); }
.layer-item.group-child-hidden { display: none !important; }

.visibility-toggle {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2px;
  width: 24px;
  height: 24px;
  border-radius: 4px;
  transition: all 0.2s;
}
.visibility-toggle:hover {
  background: rgba(255,255,255,0.1);
  color: var(--text-main);
}
.layer-visible .visibility-toggle {
  color: var(--text-main);
}
.layer-item label {
  flex: 1;
  user-select: none;
}
.layer-visible {
  opacity: 1;
}
.layer-item:not(.layer-visible) label {
  opacity: 0.5;
}

/* Main Content Area */
.center-workspace {
  flex: 1;
  display: flex;
  flex-direction: column;
  background-color: var(--bg-dark);
  position: relative;
  overflow: hidden; /* Prevent overflow of zoomed svg */
}

.top-bar {
  padding: 16px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  z-index: 20;
  pointer-events: none; /* Let clicks pass through empty space */
}

.top-bar > * {
  pointer-events: auto; /* Re-enable for controls */
}

.zoom-controls {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--panel-bg);
  border: 1px solid var(--border-color);
  padding: 4px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
}

.zoom-level {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-main);
  min-width: 48px;
  text-align: center;
}

.status-badge {
  background: var(--panel-bg);
  border: 1px solid var(--border-color);
  padding: 6px 12px;
  border-radius: 20px;
  font-size: 11px;
  font-weight: 500;
  color: var(--text-muted);
}
.block-badge {
  display: block;
  border-radius: var(--radius-md);
  padding: 8px;
}
.text-center { text-align: center; }

/* Dropzone */
.dropzone {
  border: 2px dashed var(--border-color);
  border-radius: var(--radius-xl);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  background: rgba(30, 33, 40, 0.4);
  margin-bottom: 12px;
}
.dropzone.empty { flex: 1; min-height: 180px; }
.dropzone:not(.empty) { height: 60px; flex-shrink: 0; margin-bottom: 16px; }
.dropzone.dragover {
  border-color: var(--primary);
  background: rgba(92, 107, 192, 0.1);
  transform: scale(1.02);
}

.drop-content { text-align: center; pointer-events: none; }
.drop-content .btn { pointer-events: auto; }
.dropzone:not(.empty) .drop-content h2, .dropzone:not(.empty) .drop-content p { display: none; }
.dropzone:not(.empty) .drop-content .btn { margin-top: 0; }
.dropzone:not(.empty) .upload-icon { display: none; }

.upload-icon { width: 36px; height: 36px; color: var(--text-muted); margin-bottom: 12px; }
.dropzone h2 { font-size: 18px; font-weight: 600; margin-bottom: 4px; }
.dropzone p { color: var(--text-muted); font-size: 12px; }

/* Workspace Container */
.workspace {
  display: flex;
  flex: 1;
  position: relative;
  width: 100%;
  height: 100%;
}

.empty-workspace {
  align-items: center;
  justify-content: center;
}

.placeholder-text {
  color: var(--text-muted);
  font-size: 16px;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 12px;
}

.svg-container {
  width: 100%;
  height: 100%;
  position: absolute;
  top: 0;
  left: 0;
  overflow: hidden;
  cursor: grab;
}

.svg-container:active {
  cursor: grabbing;
}

.svg-transformer {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  transform-origin: center center;
  transition: transform 0.1s cubic-bezier(0.2, 0, 0, 1);
}

/* Checkered Background for Transparency */
.checkered-bg {
  background-image: 
    linear-gradient(45deg, #252830 25%, transparent 25%), 
    linear-gradient(-45deg, #252830 25%, transparent 25%), 
    linear-gradient(45deg, transparent 75%, #252830 75%), 
    linear-gradient(-45deg, transparent 75%, #252830 75%);
  background-size: 20px 20px;
  background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
}

canvas, svg {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  filter: drop-shadow(0 4px 12px rgba(0,0,0,0.3));
}

#svgPreview svg {
    width: 100%;
    height: 100%;
    max-width: unset;
    max-height: unset;
}

/* Loader */
.loader {
  width: 18px;
  height: 18px;
  border: 2px solid var(--border-color);
  border-bottom-color: var(--primary);
  border-radius: 50%;
  display: inline-block;
  animation: rotation 1s linear infinite;
}
@keyframes rotation {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* Scrollbar */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: var(--bg-dark); }
::-webkit-scrollbar-thumb { background: var(--border-color); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: #4a505b; }