:root {
    --primary: #6366F1;
    --primary-hover: #4F46E5;
    --secondary: #8B5CF6;
    --accent: #22D3EE;
    --bg-dark: #0F1219;
    --bg-panel: #1A1F2B;
    --bg-panel-light: #252B3A;
    --text-main: #F3F4F6;
    --text-muted: #9CA3AF;
    --border-color: #374151;
    --border-radius: 12px;
    --transition: 200ms ease;
}

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

body {
    font-family: 'Inter', system-ui, sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-main);
    line-height: 1.5;
    height: 100vh;
    overflow: hidden;
}

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

/* Header */
.app-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 1.5rem;
    background: rgba(26, 31, 43, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    height: 64px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo h1 {
    font-size: 1.25rem;
    font-weight: 600;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.logo svg {
    color: var(--primary);
}

.header-actions {
    display: flex;
    gap: 0.75rem;
}

/* Buttons */
.btn {
    padding: 0.5rem 1rem;
    border-radius: 8px;
    font-weight: 500;
    font-size: 0.875rem;
    cursor: pointer;
    transition: all var(--transition);
    border: none;
}

.btn-primary {
    background: var(--primary);
    color: white;
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

.btn-primary:hover {
    background: var(--primary-hover);
    box-shadow: 0 6px 16px rgba(99, 102, 241, 0.4);
}

.btn-secondary {
    background: var(--bg-panel-light);
    color: var(--text-main);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
}

.btn-small {
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    font-size: 0.75rem;
    background: var(--bg-panel-light);
    color: var(--text-main);
    border: 1px solid var(--border-color);
    cursor: pointer;
}

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

/* Main Layout */
.main-content {
    display: flex;
    flex: 1;
    overflow: hidden;
}

/* Toolbar */
.toolbar {
    width: 60px;
    background: var(--bg-panel);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 1rem 0;
    gap: 0.5rem;
}

.tool-btn {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    border-radius: 8px;
    color: var(--text-muted);
    cursor: pointer;
    transition: all var(--transition);
}

.tool-btn:hover {
    background: var(--bg-panel-light);
    color: var(--text-main);
}

.tool-btn.active {
    background: rgba(99, 102, 241, 0.15);
    color: var(--primary);
}

.divider {
    width: 30px;
    height: 1px;
    background: var(--border-color);
    margin: 0.5rem 0;
}

/* Workspace / Canvas */
.workspace {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #0b0d13;
    overflow: auto;
    position: relative;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
    background-size: 20px 20px;
}

.canvas-container {
    background: white;
    /* Give SVG a white background to see shapes clearly */
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    border-radius: 4px;
    overflow: hidden;
}

svg#svg-canvas {
    display: block;
}

/* Node points */
circle.node-point {
    fill: white;
    stroke: var(--primary);
    stroke-width: 2;
    cursor: pointer;
    transition: r 0.1s ease;
}

circle.node-point:hover {
    r: 6;
    fill: var(--primary);
}

circle.node-point.selected {
    fill: var(--accent);
    stroke: white;
    r: 6;
}

path.drawing-line {
    stroke: var(--primary);
    stroke-width: 2;
    stroke-dasharray: 4;
    fill: none;
    pointer-events: none;
}

/* Properties Panel */
.properties-panel {
    width: 320px;
    background: var(--bg-panel);
    border-left: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
}

.panel-header {
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.panel-header h2 {
    font-size: 1rem;
    font-weight: 500;
}

.panel-content {
    padding: 1.5rem;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-group label {
    font-size: 0.875rem;
    color: var(--text-muted);
}

.color-picker-wrapper {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

input[type="color"] {
    -webkit-appearance: none;
    border: none;
    width: 100%;
    height: 36px;
    border-radius: 6px;
    cursor: pointer;
    background: var(--bg-panel-light);
    padding: 2px;
}

input[type="color"]::-webkit-color-swatch-wrapper {
    padding: 0;
}

input[type="color"]::-webkit-color-swatch {
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 4px;
}

input[type="range"] {
    width: 100%;
    accent-color: var(--primary);
}

.val-display {
    font-size: 0.875rem;
    color: var(--text-main);
    text-align: right;
    font-variant-numeric: tabular-nums;
}

.mt-4 {
    margin-top: 1rem;
}

.code-editor {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    flex: 1;
}

.code-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

textarea#svg-code {
    flex: 1;
    min-height: 200px;
    background: #0b0d13;
    color: #a5b4fc;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1rem;
    font-family: monospace;
    font-size: 0.875rem;
    resize: none;
}

textarea#svg-code:focus {
    outline: none;
    border-color: var(--primary);
}