/* Root Variables for Consistent Color Palette */
:root {
    /* Background Colors */
    --bg-primary: #1a1a1a;
    --bg-secondary: #2a2a2a;
    --bg-tertiary: #3a3a3a;
    
    /* Accent Colors */
    --accent-primary: #2196f3;
    --accent-secondary: #64b5f6;
    --accent-success: #4caf50;
    --accent-warning: #ff9800;
    --accent-error: #f44336;
    
    /* Text Colors */
    --text-primary: #ffffff;
    --text-secondary: #b0bec5;
    --text-muted: #757575;
    
    /* Border Colors */
    --border-primary: #3a3a3a;
    --border-secondary: rgba(255, 255, 255, 0.1);
}

/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    overflow: hidden;
}

/* Layout */
#app {
    display: flex;
    flex-direction: column;
    height: 100vh;
}

.header {
    background: var(--bg-secondary);
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-secondary);
}

.header h1 {
    font-size: 1.5rem;
    font-weight: 300;
    color: var(--accent-secondary);
}

.header-controls {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

.header-controls .btn {
    margin: 0;
    width: auto;
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
}

.main-container {
    display: flex;
    flex: 1;
    overflow: hidden;
}

.sidebar {
    width: 320px;
    background: var(--bg-secondary);
    backdrop-filter: blur(10px);
    border-right: 1px solid var(--border-secondary);
    overflow-y: auto;
    padding: 1rem;
}

.viewport {
    flex: 1;
    position: relative;
    overflow: hidden;
}

.status-bar {
    background: rgba(0, 0, 0, 0.8);
    padding: 0.5rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.9rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

/* Buttons */
.btn {
    padding: 0.5rem 1rem;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.btn-primary {
    background: linear-gradient(135deg, #4caf50, #45a049);
    color: white;
}

.btn-primary:hover {
    background: linear-gradient(135deg, #45a049, #3d8b40);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(76, 175, 80, 0.3);
}

.btn-secondary {
    background: linear-gradient(135deg, #2196f3, #1976d2);
    color: white;
}

.btn-secondary:hover {
    background: linear-gradient(135deg, #1976d2, #1565c0);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(33, 150, 243, 0.3);
}

.btn-view {
    background: linear-gradient(135deg, #ff9800, #f57c00);
    color: white;
    margin: 0.2rem 0;
    width: 100%;
}

.btn-view:hover {
    background: linear-gradient(135deg, #f57c00, #ef6c00);
    transform: translateY(-2px);
}

.btn-component {
    background: linear-gradient(135deg, #9c27b0, #7b1fa2);
    color: white;
    margin: 0.2rem 0;
    width: 100%;
}

.btn-component:hover {
    background: linear-gradient(135deg, #7b1fa2, #6a1b9a);
    transform: translateY(-2px);
}

.btn-danger {
    background: linear-gradient(135deg, #f44336, #d32f2f);
    color: white;
    margin: 0.2rem 0;
    width: 100%;
}

.btn-danger:hover {
    background: linear-gradient(135deg, #d32f2f, #c62828);
    transform: translateY(-2px);
}

.btn-warning {
    background: linear-gradient(135deg, #ff5722, #e64a19);
    color: white;
    width: 100%;
}

.btn-warning:hover {
    background: linear-gradient(135deg, #e64a19, #d84315);
    transform: translateY(-2px);
}

.btn-success {
    background: linear-gradient(135deg, #4caf50, #388e3c);
    color: white;
    margin: 0.2rem 0;
    width: 100%;
}

.btn-success:hover {
    background: linear-gradient(135deg, #388e3c, #2e7d32);
    transform: translateY(-2px);
}

.btn-info {
    background: linear-gradient(135deg, #00bcd4, #0097a7);
    color: white;
    margin: 0.2rem 0;
    width: 100%;
}

.btn-info:hover {
    background: linear-gradient(135deg, #0097a7, #00838f);
    transform: translateY(-2px);
}

.btn-zoom {
    background: linear-gradient(135deg, #607d8b, #455a64);
    color: white;
    margin: 0.2rem 0;
    width: 100%;
}

.btn-zoom:hover {
    background: linear-gradient(135deg, #455a64, #37474f);
    transform: translateY(-2px);
}

/* Control Panels */
.control-panel, .results-panel {
    background: var(--bg-tertiary);
    border-radius: 8px;
    padding: 1rem;
    margin-bottom: 1rem;
    border: 1px solid var(--border-secondary);
}

.control-panel h3, .results-panel h3 {
    color: var(--accent-secondary);
    margin-bottom: 1rem;
    font-size: 1.1rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.camera-controls, .component-controls {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.material-controls, .load-controls {
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
}

.material-controls label, .load-controls label {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 0.3rem;
}

.material-controls input, .material-controls select,
.load-controls input, .load-controls select {
    padding: 0.5rem;
    border: 1px solid var(--border-secondary);
    border-radius: 4px;
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 0.9rem;
}

/* Fix dropdown option visibility */
.material-controls select option,
.load-controls select option {
    background: var(--bg-secondary);
    color: var(--text-primary);
    padding: 0.5rem;
}

.material-controls select option:hover,
.load-controls select option:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.material-controls select option:checked,
.load-controls select option:checked {
    background: var(--accent-secondary);
    color: var(--text-primary);
}

.material-controls input:focus, .material-controls select:focus,
.load-controls input:focus, .load-controls select:focus {
    outline: none;
    border-color: var(--accent-secondary);
    box-shadow: 0 0 0 2px rgba(100, 181, 246, 0.2);
}

/* Additional dropdown styling for better visibility */
select {
    appearance: none;
    -webkit-appearance: none;
    -moz-appearance: none;
    background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23ffffff' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6,9 12,15 18,9'%3e%3c/polyline%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right 0.7rem center;
    background-size: 1rem;
    padding-right: 2.5rem;
}

/* Ensure all select options are visible */
select option {
    background: var(--bg-secondary) !important;
    color: var(--text-primary) !important;
    padding: 0.5rem !important;
    border: none !important;
}

select option:hover {
    background: var(--bg-tertiary) !important;
    color: var(--text-primary) !important;
}

select option:checked,
select option:selected {
    background: var(--accent-secondary) !important;
    color: var(--text-primary) !important;
}

/* Unit Selector */
.unit-selector {
    margin: 0.5rem 0 1rem 0;
    padding: 0.6rem;
    background: rgba(255, 193, 7, 0.1);
    border-radius: 6px;
    border: 1px solid rgba(255, 193, 7, 0.3);
}

.unit-selector label {
    font-size: 0.9rem;
    color: #ffc107;
    font-weight: 600;
    margin-right: 0.5rem;
}

.unit-select {
    padding: 0.4rem 0.6rem;
    border: 1px solid rgba(255, 193, 7, 0.4);
    border-radius: 4px;
    background: rgba(0, 0, 0, 0.3);
    color: #ffffff;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    width: calc(100% - 60px);
    transition: all 0.3s ease;
}

.unit-select:hover {
    background: rgba(0, 0, 0, 0.5);
    border-color: rgba(255, 193, 7, 0.6);
}

.unit-select:focus {
    outline: none;
    border-color: #ffc107;
    box-shadow: 0 0 0 2px rgba(255, 193, 7, 0.2);
}

/* Configuration Panels */
.config-panel {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-secondary);
    border-radius: 8px;
    margin: 0.5rem 0;
    overflow: hidden;
}

.config-header {
    background: var(--bg-secondary);
    padding: 0.75rem 1rem;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background-color 0.2s ease;
    user-select: none;
}

.config-header:hover {
    background: var(--bg-primary);
}

.config-header h4,
.config-header h3 {
    margin: 0;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-primary);
}

.config-toggle {
    font-size: 0.8rem;
    color: var(--accent-secondary);
    transition: transform 0.2s ease;
}

/* Default closed state for config panels */
.config-content {
    padding: 1rem;
    background: var(--bg-primary);
    display: none; /* Default closed state */
}

.config-panel.expanded .config-content {
    display: block;
}

.config-content .dimension-inputs {
    margin: 0;
    background: transparent;
    border: none;
    padding: 0;
}

/* Expanded state for config panels */
.config-panel.expanded .config-toggle {
    transform: rotate(180deg);
}

/* Specific styling for camera and zoom controls in panels */
.config-content .camera-controls,
.config-content .zoom-controls {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.config-content .material-controls {
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
}

/* Dimension Inputs */
.dimension-inputs {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin: 0.5rem 0 1rem 0;
    padding: 0.8rem;
    background: rgba(100, 181, 246, 0.05);
    border-radius: 6px;
    border: 1px solid rgba(100, 181, 246, 0.2);
}

.unit-label {
    color: #64b5f6;
    font-weight: 600;
    font-size: 0.85rem;
}

.dimension-inputs label {
    font-size: 0.85rem;
    color: #b0bec5;
    margin-bottom: 0.2rem;
}

.dimension-inputs input {
    padding: 0.4rem;
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 4px;
    background: rgba(255, 255, 255, 0.1);
    color: #ffffff;
    font-size: 0.85rem;
    width: 100%;
}

.dimension-inputs input:focus {
    outline: none;
    border-color: #64b5f6;
    box-shadow: 0 0 0 2px rgba(100, 181, 246, 0.2);
}

.dimension-inputs input:hover {
    background: rgba(255, 255, 255, 0.15);
}

/* Results Panel */
.result-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.result-item:last-child {
    border-bottom: none;
}

.result-item .label {
    font-size: 0.9rem;
    color: #b0bec5;
}

.result-item .value {
    font-weight: 600;
    color: #ffffff;
}

.status-safe {
    color: #4caf50 !important;
}

.status-warning {
    color: #ff9800 !important;
}

.status-danger {
    color: #f44336 !important;
}

/* Viewport */
#threejs-canvas {
    width: 100%;
    height: 100%;
    display: block;
    cursor: default;
}

#threejs-canvas.dragging {
    cursor: crosshair;
}

#threejs-canvas.placing-column {
    cursor: copy;
}

#threejs-canvas.placing-beam {
    cursor: move;
}

#threejs-canvas.deleting {
    cursor: not-allowed;
}

.viewport-overlay {
    position: absolute;
    top: 1rem;
    right: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    pointer-events: none;
}

.coordinates, .fps-counter {
    background: rgba(0, 0, 0, 0.7);
    padding: 0.5rem 1rem;
    border-radius: 4px;
    font-family: 'Courier New', monospace;
    font-size: 0.8rem;
    color: #64b5f6;
    backdrop-filter: blur(5px);
}

/* Loading Screen */
.loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--bg-primary);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    backdrop-filter: blur(10px);
}

.loading-content {
    text-align: center;
    color: var(--text-primary);
    max-width: 500px;
    padding: 2rem;
}

.loading-logo h1 {
    font-size: 2rem;
    margin: 0 0 2rem 0;
    color: var(--accent-secondary);
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.spinner {
    width: 60px;
    height: 60px;
    border: 4px solid var(--border-secondary);
    border-top: 4px solid var(--accent-secondary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 1.5rem;
    box-shadow: 0 0 20px rgba(100, 181, 246, 0.3);
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.loading-status {
    margin-bottom: 2rem;
}

.loading-status p {
    font-size: 1.2rem;
    color: #e3f2fd;
    margin: 0 0 1rem 0;
    font-weight: 500;
}

.progress-container {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-top: 1rem;
}

.progress-bar {
    flex: 1;
    height: 8px;
    background: var(--border-secondary);
    border-radius: 4px;
    overflow: hidden;
    box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.2);
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--accent-secondary), var(--accent-primary));
    border-radius: 4px;
    transition: width 0.3s ease;
    width: 0%;
    box-shadow: 0 0 10px rgba(100, 181, 246, 0.5);
}

.progress-text {
    font-size: 0.9rem;
    color: #b0bec5;
    font-weight: 600;
    min-width: 40px;
}

.loading-steps {
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
    margin-top: 2rem;
}

.step {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.8rem 1rem;
    background: var(--bg-tertiary);
    border-radius: 8px;
    border: 1px solid var(--border-secondary);
    transition: all 0.3s ease;
    opacity: 0.5;
}

.step.active {
    background: rgba(33, 150, 243, 0.1);
    border-color: rgba(33, 150, 243, 0.3);
    opacity: 1;
    transform: translateX(5px);
}

.step.completed {
    background: rgba(76, 175, 80, 0.1);
    border-color: rgba(76, 175, 80, 0.3);
    opacity: 1;
}

.step-icon {
    font-size: 1.2rem;
    min-width: 24px;
}

.step-text {
    font-size: 0.95rem;
    color: #e3f2fd;
    flex: 1;
}

.step.completed .step-icon {
    color: #4caf50;
}

.step.active .step-icon {
    color: #64b5f6;
    animation: pulse 1.5s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1); }
}

/* Loading states for buttons */
.btn.loading {
    position: relative;
    color: transparent !important;
    pointer-events: none;
}

.btn.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 16px;
    height: 16px;
    margin: -8px 0 0 -8px;
    border: 2px solid transparent;
    border-top: 2px solid currentColor;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

/* Analysis loading overlay */
.analysis-loading {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    backdrop-filter: blur(5px);
}

.analysis-loading-content {
    background: rgba(255, 255, 255, 0.95);
    padding: 2rem;
    border-radius: 12px;
    text-align: center;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    max-width: 400px;
}

.analysis-loading-content h3 {
    margin: 0 0 1rem 0;
    color: #333;
}

.analysis-loading-content p {
    margin: 0 0 1.5rem 0;
    color: #666;
}

.analysis-progress {
    width: 100%;
    height: 6px;
    background: #e0e0e0;
    border-radius: 3px;
    overflow: hidden;
    margin-bottom: 1rem;
}

.analysis-progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #4caf50, #8bc34a);
    border-radius: 3px;
    transition: width 0.3s ease;
    width: 0%;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .sidebar {
        width: 280px;
    }
    
    .header {
        padding: 0.8rem 1rem;
    }
    
    .header h1 {
        font-size: 1.3rem;
    }
}

@media (max-width: 768px) {
    .main-container {
        flex-direction: column;
    }
    
    .sidebar {
        width: 100%;
        height: 200px;
        order: 2;
    }
    
    .viewport {
        order: 1;
        height: calc(100vh - 300px);
    }
}

/* Scrollbar Styling */
.sidebar::-webkit-scrollbar {
    width: 6px;
}

.sidebar::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.1);
}

.sidebar::-webkit-scrollbar-thumb {
    background: rgba(100, 181, 246, 0.5);
    border-radius: 3px;
}

.sidebar::-webkit-scrollbar-thumb:hover {
    background: rgba(100, 181, 246, 0.7);
}

/* Animation Classes */
.fade-in {
    animation: fadeIn 0.5s ease-in;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.slide-in {
    animation: slideIn 0.3s ease-out;
}

@keyframes slideIn {
    from { transform: translateX(-20px); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

/* Column Stacking Panel */
.stacking-panel {
    position: fixed;
    bottom: 80px;
    right: 20px;
    z-index: 1000;
    animation: slideUp 0.3s ease-out;
}

@keyframes slideUp {
    from { transform: translateY(20px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

.stacking-content {
    background: rgba(0, 0, 0, 0.95);
    border: 2px solid #4caf50;
    border-radius: 8px;
    padding: 1.5rem;
    box-shadow: 0 4px 20px rgba(76, 175, 80, 0.4);
    min-width: 250px;
}

.stacking-content h4 {
    color: #4caf50;
    margin: 0 0 0.5rem 0;
    font-size: 1.1rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.stacking-content p {
    color: #ffffff;
    margin: 0 0 1rem 0;
    font-size: 0.95rem;
    padding: 0.5rem;
    background: rgba(76, 175, 80, 0.1);
    border-radius: 4px;
    border-left: 3px solid #4caf50;
}

.stacking-content .btn {
    width: 100%;
    margin: 0.3rem 0;
}

/* Global Compass Widget */
.compass-widget {
    position: fixed;
    top: 50%;
    right: 20px;
    transform: translateY(-50%);
    z-index: 1000;
    pointer-events: none;
}

.compass-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}

.compass-circle {
    position: relative;
    width: 80px;
    height: 80px;
    border: 2px solid var(--accent-secondary);
    border-radius: 50%;
    background: rgba(26, 26, 26, 0.9);
    backdrop-filter: blur(10px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.compass-needle {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 2px;
    height: 30px;
    background: var(--accent-error);
    transform-origin: bottom center;
    transform: translate(-50%, -100%) rotate(0deg);
    transition: transform 0.3s ease;
    z-index: 3;
}

.compass-needle::before {
    content: '';
    position: absolute;
    top: -8px;
    left: -3px;
    width: 8px;
    height: 8px;
    background: var(--accent-error);
    border-radius: 50%;
}

.compass-directions {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.compass-direction {
    position: absolute;
    font-size: 12px;
    font-weight: bold;
    color: var(--text-primary);
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.8);
    user-select: none;
}

.compass-north {
    top: 4px;
    left: 50%;
    transform: translateX(-50%);
    color: var(--accent-error);
}

.compass-east {
    top: 50%;
    right: 4px;
    transform: translateY(-50%);
}

.compass-south {
    bottom: 4px;
    left: 50%;
    transform: translateX(-50%);
}

.compass-west {
    top: 50%;
    left: 4px;
    transform: translateY(-50%);
}

.compass-center {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 4px;
    height: 4px;
    background: var(--accent-secondary);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    z-index: 2;
}

.compass-info {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.2rem;
    background: rgba(26, 26, 26, 0.9);
    backdrop-filter: blur(10px);
    padding: 0.5rem;
    border-radius: 6px;
    border: 1px solid var(--border-secondary);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

.compass-angle {
    font-size: 14px;
    font-weight: bold;
    color: var(--accent-secondary);
}

.compass-direction-text {
    font-size: 10px;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Compass hover effect */
.compass-widget:hover .compass-circle {
    border-color: var(--accent-primary);
    box-shadow: 0 4px 16px rgba(33, 150, 243, 0.3);
}

.compass-widget:hover .compass-needle {
    background: var(--accent-primary);
}

.compass-widget:hover .compass-needle::before {
    background: var(--accent-primary);
}

/* Column Selection Blink Animation */
@keyframes columnSelectBlink {
    0%, 100% { 
        opacity: 1;
    }
    50% { 
        opacity: 0.3;
    }
}

.column-selected {
    animation: columnSelectBlink 1s ease-in-out infinite;
}