@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');
* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: 'Inter', system-ui, sans-serif; background: #fff; color: #1e293b; }

.diagram-header { text-align: center; padding: 12px 0 2px; margin-top: 30px; }
.diagram-header h1 { font-size: 18px; font-weight: 700; color: #0f172a; margin: 10px ; }
.diagram-header p { font-size: 11px; color: #64748b; margin-top: 2px; }

.legend { display: flex; flex-wrap: wrap; gap: 14px; justify-content: center; padding: 6px 20px 8px; margin-top: 10px; }
.legend-item { display: flex; align-items: center; gap: 5px; font-size: 11px; color: #475569; font-weight: 500; }
.legend-swatch { width: 24px; height: 14px; border-radius: 3px; border: 1.5px solid; }

#diagram-container { width: 100%; margin-top: 20px; }
svg#canvas { width: 100%; display: block; }

.legend-toggle { user-select: none; border-radius: 4px; padding: 2px 6px; transition: opacity 0.2s; }
.legend-toggle:hover { background: #f1f5f9; }
.legend-toggle.hidden { opacity: 0.35; text-decoration: line-through; }

#tooltip-box {
    display: none; position: fixed; background: #fff; border: 1px solid #e2e8f0;
    border-radius: 8px; padding: 8px 12px; font-size: 11px; color: #475569;
    max-width: 280px; z-index: 1000; box-shadow: 0 4px 16px rgba(0,0,0,0.1);
    line-height: 1.4; pointer-events: none;
}