/* Knowledge Space Explorer - vis-network MicroSim
   Hierarchical lattice of valid knowledge states, empty at top, full at bottom. */

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

body {
    font-family: Arial, Helvetica, sans-serif;
    background-color: aliceblue;
    color: #212529;
}

.container {
    position: relative;
    width: 100%;
    height: 100vh;
}

/* Full-canvas network; overlays are absolute siblings (never children). */
#network {
    width: 100%;
    height: 100%;
    background-color: aliceblue;
}

/* ===== Title ===== */
.title {
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 20px;
    font-weight: bold;
    color: #1a3a6c;
    background-color: rgba(240, 248, 255, 0.85);
    padding: 2px 12px;
    border-radius: 6px;
    z-index: 10;
}

/* ===== Legend ===== */
.legend {
    position: absolute;
    top: 44px;
    left: 10px;
    padding: 8px 10px;
    background-color: rgba(255, 255, 255, 0.95);
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    z-index: 10;
    max-width: 200px;
}

.legend-row {
    font-size: 12px;
    margin-bottom: 4px;
}

.legend-row-sub {
    font-size: 11px;
    color: #555;
    margin-top: 6px;
    border-top: 1px solid #e0e0e0;
    padding-top: 4px;
}

.legend-item {
    display: flex;
    align-items: center;
    margin: 2px 0;
    font-size: 11px;
}

.swatch {
    width: 15px;
    height: 15px;
    border-radius: 4px;
    margin-right: 6px;
    border: 1px solid #666;
    flex: 0 0 auto;
}

/* Blue gradient by depth (must match JS DEPTH_COLORS). */
.d0 { background-color: #eceff1; }
.d1 { background-color: #bbdefb; }
.d2 { background-color: #64b5f6; }
.d3 { background-color: #2196f3; }
.d4 { background-color: #1565c0; }
.d4.gold { border: 2px solid #f9a825; }
.invalid { background-color: #cfd8dc; border: 1px dashed #d32f2f; }

/* ===== Right panel ===== */
.right-panel {
    position: absolute;
    top: 44px;
    right: 10px;
    width: 260px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    z-index: 10;
}

.controls {
    display: flex;
    flex-direction: column;
    gap: 10px;
    background-color: rgba(255, 255, 255, 0.97);
    padding: 12px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.btn {
    padding: 10px 16px;
    font-size: 14px;
    font-weight: bold;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    transition: background-color 0.2s;
}

.btn-primary { background-color: #2196f3; color: white; }
.btn-primary:hover { background-color: #1976d2; }
.btn-primary:disabled { background-color: #90caf9; cursor: not-allowed; }

.toggle {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    cursor: pointer;
    user-select: none;
}

.toggle input { width: 16px; height: 16px; cursor: pointer; }

.infobox {
    background-color: rgba(255, 255, 255, 0.97);
    border-radius: 8px;
    padding: 12px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    border-left: 4px solid #2196f3;
}

.infobox.invalid-note { border-left-color: #d32f2f; }
.infobox.edge-note { border-left-color: #f9a825; }

.infobox-title {
    font-weight: bold;
    font-size: 13px;
    margin-bottom: 6px;
    color: #1a3a6c;
}

.infobox-content {
    font-size: 12px;
    line-height: 1.5;
}

/* ===== Responsive: controls wrap below the network under 600px ===== */
@media (max-width: 600px) {
    .title { font-size: 16px; }
    .right-panel {
        position: absolute;
        top: auto;
        bottom: 6px;
        left: 6px;
        right: 6px;
        width: auto;
        flex-direction: row;
        flex-wrap: wrap;
    }
    .controls {
        flex: 1 1 100%;
        flex-direction: row;
        flex-wrap: wrap;
        align-items: center;
    }
    .infobox { flex: 1 1 100%; }
    .legend { max-width: 150px; font-size: 10px; }
}