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

:root {
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --accent: #3b82f6;
    --accent-hover: #2563eb;
    --danger: #ef4444;
    --danger-hover: #dc2626;
    --border: #e2e8f0;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.1), 0 1px 2px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --point-color: #3b82f6;
    --point-hover: #1d4ed8;
    --point-selected: #8b5cf6;
    --line-color: #64748b;
    --grid-color: #e2e8f0;
}

/* Theme toggle icon visibility */
[data-theme="dark"] #themeToggle .sun-icon {
    display: none;
}

[data-theme="dark"] #themeToggle .moon-icon {
    display: block !important;
}

[data-theme="dark"] {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --accent: #60a5fa;
    --accent-hover: #3b82f6;
    --danger: #f87171;
    --danger-hover: #ef4444;
    --border: #334155;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.3), 0 1px 2px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.3), 0 4px 6px -2px rgba(0, 0, 0, 0.2);
    --point-color: #60a5fa;
    --point-hover: #3b82f6;
    --point-selected: #a78bfa;
    --line-color: #94a3b8;
    --grid-color: #334155;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    overflow: hidden;
}

.app {
    display: flex;
    flex-direction: column;
    height: 100vh;
}

.app-body {
    display: flex;
    flex: 1;
    overflow: hidden;
}

/* Color Sidebar */
.color-sidebar {
    width: 100px;
    min-width: 100px;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border);
    padding: 12px;
    display: flex;
    flex-direction: column;
    gap: 16px;
    overflow-y: auto;
    flex-shrink: 0;
}

.sidebar-section {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.sidebar-footer {
    margin-top: auto;
    padding-top: 12px;
    border-top: 1px solid var(--border);
}

.version-hash {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 4px;
    padding: 6px 8px;
    background: var(--bg-primary);
    border-radius: 6px;
    font-family: 'Monaco', 'Menlo', 'Courier New', monospace;
    font-size: 0.65rem;
}

.hash-label {
    color: var(--text-secondary);
    font-weight: 600;
}

.hash-value {
    color: var(--accent);
    font-weight: 500;
    letter-spacing: 0.5px;
}

.sidebar-label {
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
}

.main-color-picker {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 40px;
    border: 2px solid var(--border);
    border-radius: 8px;
    cursor: pointer;
    padding: 0;
    background: none;
}

.main-color-picker::-webkit-color-swatch-wrapper {
    padding: 3px;
}

.main-color-picker::-webkit-color-swatch {
    border: none;
    border-radius: 5px;
}

.swatch-grid {
    display: grid;
    grid-template-columns: repeat(2, 36px);
    gap: 6px;
}

.swatch {
    width: 36px;
    height: 36px;
    border: 2px solid var(--border);
    border-radius: 6px;
    cursor: pointer;
    position: relative;
    background: repeating-conic-gradient(#ccc 0% 25%, white 0% 50%) 50% / 8px 8px;
    box-sizing: border-box;
    flex-shrink: 0;
}

.swatch.active {
    border-color: var(--accent);
    box-shadow: 0 0 0 2px var(--accent);
}

.swatch-color {
    position: absolute;
    inset: 0;
    border-radius: 4px;
}

.transparent-swatch {
    background: white;
    display: flex;
    align-items: center;
    justify-content: center;
}

.transparent-swatch svg {
    width: 60%;
    height: 60%;
}

.random-swatch {
    background: white;
    display: flex;
    align-items: center;
    justify-content: center;
}

.random-swatch svg {
    width: 100%;
    height: 100%;
}

.swatch.empty {
    border-style: dashed;
    background: var(--bg-primary);
}

.swatch.empty::after {
    content: '+';
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    font-size: 1rem;
}

/* Heat Slider */
.heat-slider {
    width: 100%;
    cursor: pointer;
    -webkit-appearance: none;
    appearance: none;
    height: 6px;
    border-radius: 3px;
    background: linear-gradient(to right, #60a5fa, #f87171);
    outline: none;
}

.heat-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--text-primary);
    border: 2px solid var(--bg-secondary);
    cursor: pointer;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.heat-slider::-moz-range-thumb {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--text-primary);
    border: 2px solid var(--bg-secondary);
    cursor: pointer;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.heat-drag-value {
    text-align: center;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--accent);
    margin-top: 4px;
}

/* Toolbar */
.toolbar {
    display: flex;
    align-items: center;
    gap: 24px;
    padding: 12px 24px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow);
    z-index: 100;
}

.toolbar h1 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
}

.tools {
    display: flex;
    align-items: center;
    gap: 8px;
}

.tool-group {
    display: flex;
    align-items: center;
    gap: 4px;
}

.tool-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 8px 16px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--bg-secondary);
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.15s ease;
}

.tool-btn.icon-only {
    padding: 8px;
    min-width: 36px;
    min-height: 36px;
}

.tool-btn:hover:not(:disabled) {
    background: var(--bg-primary);
    color: var(--text-primary);
    border-color: var(--accent);
}

.tool-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.tool-btn.active {
    background: var(--accent);
    color: white;
    border-color: var(--accent);
}

.tool-btn.active:hover {
    background: var(--accent-hover);
}

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

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

.tool-btn svg {
    flex-shrink: 0;
}

/* Checkbox as icon button */
.checkbox-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 8px;
    min-width: 36px;
    min-height: 36px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--bg-secondary);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.15s ease;
}

.checkbox-btn:hover {
    background: var(--bg-primary);
    color: var(--text-primary);
    border-color: var(--accent);
}

.checkbox-btn input {
    display: none;
}

.checkbox-btn input:checked + .checkbox-icon {
    color: var(--accent);
}

.checkbox-btn input:not(:checked) + .checkbox-icon {
    opacity: 0.4;
}

#groupOps {
    opacity: 0.4;
    pointer-events: none;
    transition: opacity 0.15s ease;
}

#groupOps.has-selection {
    opacity: 1;
    pointer-events: auto;
}

.scale-slider {
    width: 60px;
    cursor: pointer;
}

.scale-display {
    font-size: 0.7rem;
    color: var(--text-secondary);
    min-width: 32px;
}

.zoom-display {
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 48px;
    padding: 4px 8px;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-secondary);
    background: var(--bg-primary);
    border-radius: 4px;
}

.separator {
    width: 1px;
    height: 24px;
    background: var(--border);
    margin: 0 8px;
}

/* Color Picker */
.color-picker-label {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 4px;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.15s ease;
}

.color-picker-label:hover {
    background: var(--bg-primary);
}

.color-picker-label input[type="color"] {
    -webkit-appearance: none;
    appearance: none;
    width: 28px;
    height: 28px;
    border: 2px solid var(--border);
    border-radius: 6px;
    cursor: pointer;
    padding: 0;
    background: none;
}

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

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

.color-picker-label input[type="color"]::-moz-color-swatch {
    border: none;
    border-radius: 3px;
}

.status {
    margin-left: auto;
    padding: 8px 16px;
    background: var(--bg-primary);
    border-radius: 8px;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* Whiteboard */
.whiteboard-container {
    flex: 1;
    position: relative;
    overflow: hidden;
    min-width: 0;
}

.whiteboard {
    width: 100%;
    height: 100%;
    background-color: var(--bg-primary);
    background-image: 
        linear-gradient(90deg, var(--grid-color) 1px, transparent 1px),
        linear-gradient(var(--grid-color) 1px, transparent 1px);
    background-size: 20px 20px;
    cursor: crosshair;
}

.whiteboard.move-mode {
    cursor: default;
}

.whiteboard.connect-mode {
    cursor: pointer;
}

.whiteboard.shape-mode {
    cursor: pointer;
}

.whiteboard.delete-mode {
    cursor: pointer;
}

.whiteboard.fill-mode {
    cursor: pointer;
}

.whiteboard.select-mode {
    cursor: crosshair;
}

.whiteboard.select-face-mode {
    cursor: pointer;
}

/* Selection rectangle */
.selection-rect {
    fill: rgba(59, 130, 246, 0.1);
    stroke: var(--accent);
    stroke-width: 1;
    stroke-dasharray: 4 2;
}

/* Points */
.point {
    cursor: pointer;
    transition: transform 0.1s ease, opacity 0.2s ease;
}

.point circle {
    fill: var(--point-color);
    stroke: white;
    stroke-width: 2;
    filter: url(#pointShadow);
    transition: all 0.15s ease;
}

.point:hover circle {
    fill: var(--point-hover);
    transform: scale(1.1);
}

.point.selected circle {
    fill: var(--point-selected);
    stroke: white;
    stroke-width: 3;
}

.point.in-group circle {
    fill: var(--point-selected);
    stroke: #fbbf24;
    stroke-width: 3;
}

.connection-line.in-group {
    stroke: #fbbf24;
    stroke-width: 3;
}

.fill-region.in-group {
    stroke: #fbbf24;
    stroke-width: 2;
    stroke-dasharray: 4 2;
}

.point.dragging {
    cursor: grabbing;
}

.point.dragging circle {
    fill: var(--point-hover);
}

#pointsLayer.hidden .point {
    opacity: 0;
    pointer-events: none;
}

#linesLayer.hidden .connection-line {
    opacity: 0;
    pointer-events: none;
}

/* Fill regions */
.fill-region {
    cursor: pointer;
    transition: filter 0.15s ease;
}

.fill-region:hover {
    filter: brightness(1.1);
}

/* Lines */
.connection-line {
    stroke: var(--line-color);
    stroke-width: 2;
    stroke-linecap: round;
    transition: stroke 0.15s ease;
    cursor: pointer;
}

.connection-line:hover {
    stroke: var(--text-primary);
    stroke-width: 3;
}

.whiteboard.delete-mode .connection-line:hover {
    stroke: var(--danger);
    stroke-width: 4;
}

.whiteboard.delete-mode .point:hover circle {
    fill: var(--danger);
}

/* Temp line while connecting */
.temp-line {
    stroke: var(--accent);
    stroke-width: 2;
    stroke-dasharray: 5, 5;
    pointer-events: none;
}

/* Line split preview */
.split-preview-dot {
    fill: var(--accent);
    stroke: white;
    stroke-width: 2;
    cursor: grab;
    pointer-events: none;
    filter: drop-shadow(0 2px 4px rgba(0,0,0,0.3));
}

.split-preview-line {
    stroke: var(--accent);
    stroke-width: 2;
    stroke-dasharray: 6, 4;
    pointer-events: none;
}

/* Responsive */
@media (max-width: 768px) {
    .toolbar {
        flex-wrap: wrap;
        gap: 8px;
        padding: 12px 16px;
    }

    .toolbar h1 {
        width: 100%;
        font-size: 1rem;
    }

    .tool-group {
        gap: 2px;
    }

    .tool-btn.icon-only {
        padding: 6px;
        min-width: 32px;
        min-height: 32px;
    }

    .tool-btn.icon-only svg {
        width: 18px;
        height: 18px;
    }

    .separator {
        display: none;
    }

    .status {
        width: 100%;
        text-align: center;
        font-size: 0.75rem;
        padding: 6px 12px;
    }
}

/* Background corner points */
.bg-corner-point {
    opacity: 0;
    transition: opacity 0.2s;
    cursor: move;
    pointer-events: all;
}

.bg-corner-point:hover {
    opacity: 1 !important;
}

.bg-corner-point.dragging {
    opacity: 1 !important;
}