body, html {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    background-color: #f8fafc;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}


svg {
    width: 100%;
    height: 100%;
    display: block;
}

.link {
    stroke: #cbd5e1; 
    stroke-width: 2px;
    stroke-opacity: 0.6;
}

.node text {
    font-size: 12px;
    font-weight: 600;
    fill: #334155;
    pointer-events: none;
    user-select: none;
    text-shadow: 0 1px 3px rgba(255,255,255,0.8);
}

.node-hub circle {
    fill: #3b82f6;
    stroke: #eff6ff;
    stroke-width: 3px;
    box-shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1);
    transition: fill 0.2s;
}
.node-hub:hover circle { fill: #2563eb;}

.node-note rect {
    fill: #10b981; 
    stroke: #ecfdf5;
    stroke-width: 3px;
    transition: fill 0.2s;
}
.node-note:hover rect { fill: #059669; }

.node-has-content { stroke: #fbbf24 !important; stroke-width: 3px !important; stroke-dasharray: 4;}


textarea::-webkit-scrollbar {
    width: 8px;
}
textarea::-webkit-scrollbar-track {
    background: #f1f5f9; 
    border-radius: 4px;
}
textarea::-webkit-scrollbar-thumb {
    background: #cbd5e1; 
    border-radius: 4px;
}
textarea::-webkit-scrollbar-thumb:hover {
    background: #94a3b8; 
}