#stair-calculator-3d-app {
    display: flex;
    flex-wrap: wrap;
    width: 100%;
    height: 80vh;
    min-height: 600px;
    background-color: #f0f2f5;
    border-radius: 1rem;
    overflow: hidden;
    box-shadow: 0 10px 25px rgba(0,0,0,0.1);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}
.ssc-3d-panel {
    width: 100%;
    max-width: 340px;
    padding: 1.5rem;
    background-color: #ffffff;
    overflow-y: auto;
    border-right: 1px solid #e5e7eb;
}
.ssc-3d-viewer {
    flex: 1;
    min-width: 400px;
    min-height: 400px;
    position: relative;
}
#ssc-3d-canvas {
    display: block;
    width: 100%;
    height: 100%;
}
.ssc-3d-panel h2 {
    font-size: 1.5rem;
    font-weight: 600;
    color: #111827;
    margin-top: 0;
    margin-bottom: 1.5rem;
}
.ssc-3d-form-group {
    margin-bottom: 1rem;
}
.ssc-3d-form-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    color: #4b5563;
    margin-bottom: 0.5rem;
}
.ssc-3d-form-group input, .ssc-3d-form-group select {
    width: 100%;
    /*padding: 0.65rem;*/
    border: 1px solid #d1d5db;
    border-radius: 0.5rem;
    background-color: #f9fafb;
    transition: border-color 0.2s, box-shadow 0.2s;
}
.ssc-3d-form-group input:focus, .ssc-3d-form-group select:focus {
    outline: none;
    border-color: #3b82f6;
    box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.3);
}
.ssc-3d-radio-group {
     display: flex; gap: 1rem; background-color: #f9fafb; padding: 0.5rem; border-radius: 0.5rem; border: 1px solid #d1d5db;
}
.ssc-3d-radio-group label { margin-bottom: 0; font-size: 0.8rem; display: flex; align-items: center; gap: 4px; cursor: pointer; }

.ssc-3d-results {
    margin-top: 1.5rem; padding-top: 1rem; border-top: 1px solid #e5e7eb;
}
.ssc-3d-results ul { list-style: none; padding: 0; margin: 0; font-size: 0.875rem; }
.ssc-3d-results li { display: flex; justify-content: space-between; padding: 0.5rem 0; border-bottom: 1px solid #f3f4f6; }
.ssc-3d-results li:last-child { border-bottom: none; }
.ssc-3d-results .label { color: #4b5563; }
.ssc-3d-results .value { font-weight: 600; color: #111827; }

#reset-view-btn {
    width: 100%; margin-top: 1rem; background-color: #f3f4f6; border: 1px solid #d1d5db;
    color: #4b5563; padding: 0.75rem; border-radius: 0.5rem; cursor: pointer; font-weight: 500;
    transition: background-color 0.2s;
}
#reset-view-btn:hover { background-color: #e5e7eb; }

.ssc-3d-note {
    font-size: 12px;
    color: #666;
    margin: 25px 0 0 0;
}

.ssc-3d-loader {
    position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%);
    color: #3b82f6; font-weight: 500;
}

@media (max-width: 768px) {
    #stair-calculator-3d-app { flex-direction: column; height: auto; }
    .ssc-3d-panel { max-width: 100%; border-right: none; border-bottom: 1px solid #e5e7eb; }
    .ssc-3d-viewer { height: 60vh; min-width: 100%; }
}