.drop-zone {
            border: 3px dashed var(--border-color);
            border-radius: 12px;
            padding: 2.5rem 1.5rem;
            text-align: center;
            cursor: pointer;
            transition: all 0.3s ease;
            background-color: rgba(70, 130, 180, 0.04);
            position: relative;
            min-height: 200px;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
        }
        .drop-zone:hover {
            border-color: var(--primary-color);
            background-color: rgba(70, 130, 180, 0.08);
        }
        .drop-zone.dragover {
            border-color: var(--primary-color);
            background-color: rgba(70, 130, 180, 0.15);
            transform: scale(1.01);
        }
        .drop-zone .icon {
            font-size: 4rem;
            color: var(--primary-color);
            margin-bottom: 0.5rem;
        }
        .drop-zone .text {
            font-size: 1.1rem;
            color: var(--text-muted);
        }
        .drop-zone .subtext {
            font-size: 0.9rem;
            color: var(--text-muted-light);
            margin-top: 0.25rem;
        }
        .drop-zone input[type="file"] {
            position: absolute;
            inset: 0;
            opacity: 0;
            cursor: pointer;
        }
        .preview-container {
            display: flex;
            flex-wrap: wrap;
            gap: 1.5rem;
            margin-top: 1.5rem;
            justify-content: center;
        }
        .preview-box {
            flex: 1 1 280px;
            min-width: 200px;
            background: #fafafa;
            border-radius: 8px;
            padding: 0.75rem;
            border: 1px solid var(--border-color);
            text-align: center;
        }
        .preview-box img,
        .preview-box canvas {
            max-width: 100%;
            max-height: 320px;
            border-radius: 4px;
            background: #f0f0f0;
            display: block;
            margin: 0 auto;
        }
        .preview-box .label {
            font-weight: 600;
            margin-top: 0.5rem;
            font-size: 0.9rem;
            color: var(--text-muted);
        }
        .param-group {
            display: flex;
            flex-wrap: wrap;
            gap: 1.5rem;
            margin: 1rem 0;
        }
        .param-item {
            flex: 1 1 180px;
            min-width: 140px;
        }
        .param-item label {
            font-size: 0.9rem;
            font-weight: 500;
            display: block;
            margin-bottom: 0.25rem;
        }
        .param-item input[type="range"] {
            width: 100%;
            accent-color: var(--primary-color);
        }
        .param-item .value {
            font-size: 0.85rem;
            color: var(--text-muted);
            text-align: right;
            display: block;
        }
        .depth-colormap {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            margin: 1rem 0;
            justify-content: center;
            flex-wrap: wrap;
        }
        .depth-colormap .swatch {
            width: 24px;
            height: 24px;
            border-radius: 4px;
            border: 1px solid #ddd;
        }
        .depth-colormap .label {
            font-size: 0.8rem;
            color: var(--text-muted);
        }
        .action-bar {
            display: flex;
            flex-wrap: wrap;
            gap: 0.75rem;
            margin: 1rem 0;
            justify-content: center;
        }
        .result-section {
            margin-top: 2rem;
        }
        .depth-stats {
            display: flex;
            flex-wrap: wrap;
            gap: 1rem;
            justify-content: center;
            margin: 0.5rem 0;
        }
        .depth-stats .stat {
            background: #f8f9fa;
            padding: 0.4rem 1rem;
            border-radius: 20px;
            font-size: 0.85rem;
            border: 1px solid var(--border-color);
        }
        .depth-stats .stat strong {
            color: var(--primary-color);
        }
        .method-tabs {
            display: flex;
            gap: 0.5rem;
            flex-wrap: wrap;
            margin: 1rem 0;
        }
        .method-tabs .tab {
            padding: 0.5rem 1.25rem;
            border-radius: 30px;
            background: #f0f0f0;
            border: 1px solid transparent;
            cursor: pointer;
            font-size: 0.9rem;
            transition: all 0.2s;
            font-weight: 500;
        }
        .method-tabs .tab:hover {
            background: #e0e0e0;
        }
        .method-tabs .tab.active {
            background: var(--primary-color);
            color: white;
            border-color: var(--primary-color);
        }
        .method-tabs .tab .badge {
            font-size: 0.7rem;
            background: rgba(255, 255, 255, 0.3);
            color: inherit;
            margin-left: 0.4rem;
            padding: 0.1rem 0.5rem;
            border-radius: 12px;
        }
        .method-tabs .tab.active .badge {
            background: rgba(255, 255, 255, 0.25);
        }
        .loading-overlay {
            position: absolute;
            inset: 0;
            background: rgba(255, 255, 255, 0.85);
            display: none;
            align-items: center;
            justify-content: center;
            flex-direction: column;
            border-radius: 12px;
            z-index: 10;
        }
        .loading-overlay.show {
            display: flex;
        }
        .loading-overlay .spinner {
            width: 48px;
            height: 48px;
            border: 4px solid var(--border-color);
            border-top-color: var(--primary-color);
            border-radius: 50%;
            animation: spin 0.8s linear infinite;
        }
        @keyframes spin {
            to {
                transform: rotate(360deg);
            }
        }
        .loading-overlay .text {
            margin-top: 1rem;
            color: var(--text-muted);
        }
        .depth-legend {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            justify-content: center;
            margin: 0.5rem 0;
            flex-wrap: wrap;
        }
        .depth-legend .gradient {
            width: 160px;
            height: 16px;
            border-radius: 4px;
            background: linear-gradient(to right, #0000ff, #00ffff, #00ff00, #ffff00, #ff0000);
            border: 1px solid #ddd;
        }
        .depth-legend .label {
            font-size: 0.75rem;
            color: var(--text-muted);
        }
        .example-thumbnails {
            display: flex;
            gap: 0.75rem;
            flex-wrap: wrap;
            justify-content: center;
            margin: 1rem 0;
        }
        .example-thumb {
            width: 80px;
            height: 80px;
            border-radius: 8px;
            overflow: hidden;
            cursor: pointer;
            border: 2px solid transparent;
            transition: all 0.2s;
            position: relative;
        }
        .example-thumb:hover {
            border-color: var(--primary-color);
            transform: scale(1.05);
        }
        .example-thumb img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }
        .example-thumb .label {
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            background: rgba(0, 0, 0, 0.6);
            color: white;
            font-size: 0.6rem;
            padding: 0.15rem;
            text-align: center;
        }
        .property-table th,
        .property-table td {
            padding: 0.75rem;
            text-align: left;
            border: 1px solid var(--border-color);
        }
        .tool-header h1 {
            font-size: 1.8rem;
            font-weight: 700;
        }
        .badge.bg-secondary {
            font-size: 0.7rem;
            font-weight: 400;
        }
        @media (max-width: 768px) {
            .preview-box {
                flex: 1 1 100%;
            }
            .param-item {
                flex: 1 1 100%;
            }
            .drop-zone {
                padding: 1.5rem 1rem;
                min-height: 150px;
            }
            .drop-zone .icon {
                font-size: 2.5rem;
            }
            .method-tabs .tab {
                font-size: 0.8rem;
                padding: 0.35rem 0.85rem;
            }
        }
        .tool-card .lead {
            font-size: 1.1rem;
            font-weight: 300;
        }
        .accordion-button:not(.collapsed) {
            background-color: rgba(70, 130, 180, 0.06);
            color: var(--primary-color);
        }
        .accordion-button:focus {
            box-shadow: 0 0 0 0.2rem rgba(70, 130, 180, 0.15);
        }
        .batch-list {
            display: flex;
            flex-wrap: wrap;
            gap: 0.5rem;
            margin: 0.5rem 0;
            justify-content: center;
        }
        .batch-item {
            display: flex;
            align-items: center;
            gap: 0.3rem;
            padding: 0.2rem 0.6rem;
            border-radius: 20px;
            background: #f0f0f0;
            border: 2px solid transparent;
            cursor: pointer;
            font-size: 0.8rem;
            transition: all 0.2s;
        }
        .batch-item.active {
            border-color: var(--primary-color);
            background: #e0ecf9;
        }
        .batch-item img {
            width: 28px;
            height: 28px;
            border-radius: 4px;
            object-fit: cover;
        }
        .batch-item .name {
            max-width: 100px;
            overflow: hidden;
            text-overflow: ellipsis;
            white-space: nowrap;
        }
        .batch-nav {
            display: flex;
            gap: 0.5rem;
            justify-content: center;
            margin: 0.5rem 0;
        }
        .modal-3d {
            width: 90vw;
            max-width: 1200px;
        }
        .modal-3d .modal-#pointCloudCanvas {
            width: 100%;
            height: 100%;
            display: block;
        }
        .export-options {
            display: inline-flex;
            gap: 0.3rem;
            align-items: center;
        }
        .export-options select {
            padding: 0.25rem 0.5rem;
            border-radius: 4px;
            border: 1px solid #ccc;
        }
        .keyboard-hint {
            font-size: 0.8rem;
            color: var(--text-muted-light);
            margin-left: 0.5rem;
        }
        .progress-indeterminate {
            width: 100%;
            height: 8px;
            border-radius: 4px;
            background: #e9ecef;
            overflow: hidden;
            position: relative;
        }
        .progress-indeterminate .bar {
            width: 40%;
            height: 100%;
            background: var(--primary-color);
            border-radius: 4px;
            animation: indeterminate 1.2s infinite ease-in-out;
        }
        @keyframes indeterminate {
            0% { transform: translateX(-100%); }
            100% { transform: translateX(300%); }
        }
        .loading-text {
            margin-top: 0.5rem;
            color: var(--text-muted);
            font-size: 0.9rem;
        }