* { margin: 0; padding: 0; box-sizing: border-box; }
html, body {
    width: 100%;
    height: 100%;
    overflow: hidden;
    font-family: Arial, Helvetica, sans-serif;
    background: #ffffff;
}
main { display: block; width: 100%; height: 100%; }
.layout {
    display: flex;
    flex-direction: row;
    width: 100%;
    height: 100%;
}
.diagram-panel {
    width: 66.67%;
    height: 100%;
    background: aliceblue;
    border-right: 1px solid #cbd5e1;
    display: flex;
    flex-direction: column;
    overflow: visible;
}
.diagram-title {
    font-size: 17px;
    color: #0d47a1;
    text-align: center;
    padding: 10px 8px 0 8px;
    font-weight: 600;
}
.mermaid {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding: 8px;
}
.mermaid svg { max-width: 100%; height: auto; }
.info-panel {
    width: 33.33%;
    height: 100%;
    padding: 12px;
    overflow: visible;
    background: #ffffff;
}
.info-panel h3 {
    font-size: 16px;
    color: #455a64;
    margin-bottom: 6px;
}
.legend {
    margin-bottom: 12px;
    font-size: 13px;
    border: 1px solid #cbd5e1;
    border-radius: 4px;
    padding: 8px 10px;
    background: #fff;
}
.legend-title { font-weight: 600; margin-bottom: 6px; color: #455a64; }
.legend-item { display: flex; align-items: center; margin: 3px 0; }
.legend-dot {
    display: inline-block;
    width: 14px; height: 14px;
    border-radius: 3px;
    margin-right: 8px;
    border: 1px solid #607d8b;
}
#panelWrap { position: relative; }
#panel {
    background-color: #f8fafc;
    color: #334155;
    border: 1px solid #e2e8f0;
    padding: 12px;
    border-radius: 6px;
    font-size: 14px;
    line-height: 1.45;
    min-height: 110px;
}
.defenses {
    margin-top: 12px;
    border: 1px solid #cbd5e1;
    border-radius: 4px;
    padding: 8px 10px;
    background: #eceff1;
}
.defenses-title { font-weight: 600; margin-bottom: 6px; color: #455a64; font-size: 13px; }
.def {
    font-size: 12.5px;
    color: #263238;
    line-height: 1.4;
    padding: 5px 7px;
    margin: 4px 0;
    background: #ffffff;
    border: 1px solid #cfd8dc;
    border-left: 4px solid #2e7d32;
    border-radius: 4px;
    cursor: help;
}
.def:hover { filter: brightness(0.97); background: #f1f8e9; }
.node, .node * { cursor: pointer; }

/* Responsive: stack vertically below 700px */
@media (max-width: 700px) {
    html, body { overflow: auto; }
    .layout { flex-direction: column; }
    .diagram-panel, .info-panel { width: 100%; }
    .diagram-panel { border-right: none; border-bottom: 1px solid #cbd5e1; }
}