:root {
            --bg-primary: #1C202B;
            --bg-secondary: #212C3E;
            --bg-tertiary: #2C3749;
            --bg-card: #2C3749;
            --bg-input: #1C202B;
            
            --text-primary: #FFFFFF;
            --text-secondary: #96A1B2;
            --text-tertiary: #6F7A8C;
            
            --border-color: rgba(150,161,178,0.12);
            --border-light: rgba(150,161,178,0.06);
            
            --accent-primary: #3C96FE;
            --accent-secondary: #2C7BE0;
            --accent-glow: rgba(60,150,254,0.15);
            
            --shadow-lg: 0 20px 50px rgba(0, 0, 0, 0.5);
            --success: #10b981;
            --warning: #f59e0b;
            --error: #ef4444;

            --panel-w: 340px;
        }

        .carbon-icon {
            width: 1em;
            height: 1em;
            display: inline-block;
            vertical-align: middle;
            flex-shrink: 0;
            fill: currentColor;
        }
        .tool-btn .carbon-icon { width: 16px; height: 16px; }
        .btn .carbon-icon { width: 14px; height: 14px; }
        .tab-icon .carbon-icon { width: 14px; height: 14px; }
        .measure-icon .carbon-icon { width: 20px; height: 20px; }
        h3 .carbon-icon { width: 14px; height: 14px; margin-right: 2px; }
        .dicom-panel-title .carbon-icon,
        .seg-panel-title .carbon-icon,
        .planes-panel-title .carbon-icon,
        .sh-title .carbon-icon { width: 16px; height: 16px; }
        .collapse-arrow .carbon-icon { width: 12px; height: 12px; }

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

        body {
            font-family: 'IBM Plex Sans', -apple-system, sans-serif;
            background: var(--bg-primary);
            color: var(--text-primary);
            overflow: hidden;
            height: 100vh;
        }

        ::-webkit-scrollbar { width: 6px; height: 6px; }
        ::-webkit-scrollbar-track { background: var(--bg-primary); border-radius: 3px; }
        ::-webkit-scrollbar-thumb { background: var(--bg-tertiary); border-radius: 3px; }
        ::-webkit-scrollbar-thumb:hover { background: var(--text-tertiary); }

        .viewer-container {
            display: flex;
            flex-direction: column;
            height: 100vh;
            position: relative;
        }

        /* ─── Header ─── */
        .header {
            background: var(--bg-secondary);
            border-bottom: 1px solid var(--border-color);
            padding: 10px 20px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            backdrop-filter: blur(10px);
            z-index: 100;
            flex-shrink: 0;
            gap: 8px;
            flex-wrap: wrap;
        }

        .logo {
            font-size: 18px;
            font-weight: 700;
            color: var(--text-primary);
            letter-spacing: -0.5px;
            display: flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
        }
        .logo img { height: 34px; width: auto; }

        .header-actions {
            display: flex;
            gap: 6px;
            align-items: center;
            flex-wrap: wrap;
        }

        .btn {
            padding: 7px 14px;
            border: none;
            border-radius: 8px;
            font-size: 12px;
            font-weight: 500;
            cursor: pointer;
            transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            font-family: 'IBM Plex Sans', sans-serif;
            display: flex;
            align-items: center;
            gap: 5px;
            background: var(--bg-tertiary);
            color: var(--text-primary);
        }
        .btn:hover { transform: translateY(-1px); box-shadow: 0 4px 12px rgba(0,0,0,0.3); }
        .btn-primary { background: var(--accent-primary); color: #fff; }
        .btn-primary:hover { background: var(--accent-secondary); box-shadow: 0 4px 16px rgba(60,150,254,0.3); }
        .btn-secondary { background: var(--bg-tertiary); color: var(--text-primary); }
        .btn-secondary:hover { background: var(--bg-primary); border-color: var(--border-color); }

        /* ─── Toolbar ─── */
        .toolbar {
            display: flex;
            align-items: center;
            gap: 3px;
            padding: 0 10px;
            border-left: 1px solid var(--border-light);
            border-right: 1px solid var(--border-light);
        }

        .tool-btn {
            width: 36px;
            height: 36px;
            background: transparent;
            border: 1px solid transparent;
            border-radius: 8px;
            color: var(--text-secondary);
            font-size: 16px;
            cursor: pointer;
            transition: all 0.25s;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .tool-btn:hover { background: var(--bg-tertiary); border-color: var(--border-color); color: var(--text-primary); }
        .tool-btn.active { background: var(--accent-primary); color: #fff; border-color: var(--accent-primary); }

        /* ─── Panel wrapper (drawer) ───
           La pestaña (.panel-tab) y el panel (.panel-inner) se mueven juntos, como
           una sola pieza rígida: cerrado, la pestaña queda pegada al borde del
           viewport; abierto, se desliza junto con el panel y queda pegada al
           borde exterior de éste (no se queda clavada en la esquina tapando nada). */
        .panel-drawer {
            position: fixed;
            top: var(--header-h, 55px);
            bottom: 0;
            z-index: 70;
            pointer-events: none;
            display: flex;
            align-items: stretch;
            transition: transform 0.32s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .panel-drawer.left {
            left: 0;
            transform: translateX(calc(-1 * var(--panel-w)));
        }
        .panel-drawer.right {
            right: 0;
            transform: translateX(var(--panel-w));
        }
        .panel-drawer.left.open,
        .panel-drawer.right.open { transform: translateX(0); }

        .panel-drawer .panel-inner {
            width: var(--panel-w);
            max-width: 85vw;
            flex-shrink: 0;
            background: rgba(33,44,62,0.97);
            backdrop-filter: blur(20px);
            border-right: 1px solid var(--border-color);
            padding: 16px 16px 80px;
            overflow-y: auto;
            box-shadow: 4px 0 32px rgba(0,0,0,0.4);
            pointer-events: all;
            box-sizing: border-box;
        }
        .panel-drawer.right .panel-inner {
            border-right: none;
            border-left: 1px solid var(--border-color);
            box-shadow: -4px 0 32px rgba(0,0,0,0.4);
        }

        /* ─── Pestaña lateral: viaja pegada al panel ─── */
        .panel-tab {
            width: 28px;
            align-self: center;
            background: rgba(33,44,62,0.97);
            border: 1px solid var(--border-color);
            border-radius: 0 8px 8px 0;
            padding: 18px 4px;
            cursor: pointer;
            pointer-events: all;
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 4px;
            user-select: none;
            transition: background 0.2s, border-color 0.2s;
            z-index: 2;
            flex-shrink: 0;
        }
        .panel-drawer.right .panel-tab {
            border-radius: 8px 0 0 8px;
            border-right: none;
            border-left: 1px solid var(--border-color);
        }
        .panel-tab:hover { background: rgba(60,150,254,0.12); border-color: var(--accent-primary); }
        .panel-tab .tab-icon { font-size: 16px; line-height: 1; color: var(--text-secondary); }
        .panel-tab .tab-arrow {
            font-size: 9px;
            color: var(--text-tertiary);
            transition: transform 0.3s;
            writing-mode: vertical-lr;
            letter-spacing: 2px;
        }
        .panel-drawer.left .panel-tab .tab-arrow::before { content: '◀'; }
        .panel-drawer.left.open .panel-tab .tab-arrow::before { content: '▶'; }
        .panel-drawer.right .panel-tab .tab-arrow::before { content: '◀'; }
        .panel-drawer.right.open .panel-tab .tab-arrow::before { content: '▶'; }

        .tool-btn#modelsToolBtn,
        .tool-btn#controlsToolBtn { position: relative; z-index: 80; }

        /* ─── Main Content ─── */
        .main-content {
            display: flex;
            flex: 1;
            position: relative;
            overflow: hidden;
        }

        #viewer {
            flex: 1;
            position: relative;
            background: var(--bg-primary);
        }
        #viewer.measuring { cursor: crosshair; }

        /* ─── Measurement Panel ─── */
        .measurement-panel {
            position: absolute;
            top: 20px;
            left: 20px;
            background: rgba(33,44,62,0.95);
            backdrop-filter: blur(20px);
            border: 1px solid var(--border-color);
            border-radius: 16px;
            padding: 20px;
            width: 300px;
            max-height: calc(100vh - 140px);
            overflow-y: auto;
            box-shadow: var(--shadow-lg);
            z-index: 50;
        }
        .measurement-panel.hidden { display: none; }

        .control-section {
            margin-bottom: 20px;
            padding-bottom: 20px;
            border-bottom: 1px solid var(--border-light);
        }
        .control-section:last-child { border-bottom: none; margin-bottom: 0; padding-bottom: 0; }

        .control-section h3 {
            font-size: 11px;
            font-weight: 600;
            text-transform: uppercase;
            letter-spacing: 1.2px;
            color: var(--text-tertiary);
            margin-bottom: 14px;
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .control-section h3 .carbon-icon { color: var(--text-tertiary); }

        .control-row {
            display: flex;
            align-items: center;
            justify-content: space-between;
            margin-bottom: 10px;
        }
        .control-label {
            font-size: 13px;
            color: var(--text-secondary);
            font-weight: 400;
        }

        /* ─── Measurement Mode Selector ─── */
        .measure-mode-selector {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 6px;
            margin-bottom: 16px;
        }
        .measure-mode-btn {
            padding: 10px;
            background: var(--bg-input);
            border: 1px solid var(--border-light);
            border-radius: 8px;
            color: var(--text-secondary);
            font-size: 12px;
            font-weight: 500;
            cursor: pointer;
            transition: all 0.25s;
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 4px;
        }
        .measure-mode-btn:hover { background: var(--bg-tertiary); color: var(--text-primary); border-color: var(--border-color); }
        .measure-mode-btn.active { background: var(--accent-primary); color: #fff; border-color: var(--accent-primary); }
        .measure-mode-btn .measure-icon { font-size: 18px; }

        /* ─── Unit Selector ─── */
        .unit-selector {
            display: flex;
            gap: 6px;
            margin-bottom: 16px;
        }
        .unit-btn {
            flex: 1;
            padding: 8px;
            background: var(--bg-input);
            border: 1px solid var(--border-light);
            border-radius: 8px;
            color: var(--text-secondary);
            font-size: 12px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.25s;
        }
        .unit-btn:hover { background: var(--bg-tertiary); color: var(--text-primary); border-color: var(--border-color); }
        .unit-btn.active { background: var(--accent-primary); color: #fff; border-color: var(--accent-primary); }

        .measurement-list { max-height: 300px; overflow-y: auto; }
        .measurement-item {
            background: var(--bg-input);
            border: 1px solid var(--border-light);
            border-radius: 8px;
            padding: 12px;
            margin-bottom: 8px;
            display: flex;
            justify-content: space-between;
            align-items: flex-start;
            gap: 8px;
            transition: border-color 0.2s;
        }
        .measurement-item:hover { border-color: var(--border-color); }
        .measurement-value {
            font-size: 18px;
            font-weight: 700;
            color: var(--accent-primary);
            font-family: 'IBM Plex Mono', monospace;
        }
        .measurement-label {
            font-size: 10px;
            color: var(--text-tertiary);
            text-transform: uppercase;
            letter-spacing: 0.5px;
        }
        .delete-btn {
            background: rgba(239,68,68,0.15);
            color: var(--error);
            border: 1px solid rgba(239,68,68,0.2);
            border-radius: 6px;
            padding: 4px 8px;
            font-size: 11px;
            cursor: pointer;
            transition: all 0.25s;
            flex-shrink: 0;
        }
        .delete-btn:hover { background: var(--error); color: #fff; border-color: var(--error); }

        /* ─── Toggle Switch ─── */
        .toggle-switch {
            position: relative;
            width: 44px;
            height: 22px;
            background: var(--bg-input);
            border-radius: 11px;
            cursor: pointer;
            border: 1px solid var(--border-light);
            transition: all 0.3s;
            flex-shrink: 0;
        }
        .toggle-switch::after {
            content: '';
            position: absolute;
            width: 16px;
            height: 16px;
            border-radius: 50%;
            background: var(--text-tertiary);
            top: 2px;
            left: 2px;
            transition: all 0.3s;
        }
        input[type="checkbox"]:checked + .toggle-switch {
            background: var(--accent-primary);
            border-color: var(--accent-primary);
        }
        input[type="checkbox"]:checked + .toggle-switch::after { left: 24px; background: #fff; }
        input[type="checkbox"] { display: none; }

        /* ─── Slider ─── */
        .slider-container { width: 100%; }
        .slider {
            width: 100%;
            height: 4px;
            border-radius: 2px;
            background: var(--bg-tertiary);
            outline: none;
            -webkit-appearance: none;
            appearance: none;
            margin: 8px 0;
            transition: background 0.2s;
        }
        .slider::-webkit-slider-thumb {
            -webkit-appearance: none;
            appearance: none;
            width: 16px;
            height: 16px;
            border-radius: 50%;
            background: var(--accent-primary);
            cursor: pointer;
            transition: all 0.2s;
        }
        .slider::-webkit-slider-thumb:hover { transform: scale(1.15); }
        .slider::-moz-range-thumb {
            width: 16px;
            height: 16px;
            border-radius: 50%;
            background: var(--accent-primary);
            cursor: pointer;
            border: none;
        }
        .slider-label {
            display: flex;
            justify-content: space-between;
            font-size: 12px;
            color: var(--text-secondary);
            margin-bottom: 4px;
        }
        .slider-value {
            color: var(--text-primary);
            font-weight: 500;
            font-family: 'IBM Plex Mono', monospace;
        }

        /* ─── Material Buttons ─── */
        .material-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 6px;
            margin-bottom: 12px;
        }
        .material-btn {
            padding: 10px;
            background: var(--bg-input);
            border: 1px solid var(--border-light);
            border-radius: 8px;
            color: var(--text-secondary);
            font-size: 12px;
            font-weight: 500;
            cursor: pointer;
            transition: all 0.25s;
            text-align: center;
        }
        .material-btn:hover { background: var(--bg-tertiary); color: var(--text-primary); border-color: var(--border-color); }
        .material-btn.active { background: var(--accent-primary); color: #fff; border-color: var(--accent-primary); }

        /* ─── Color Swatches ─── */
        .color-grid {
            display: grid;
            grid-template-columns: repeat(5, 1fr);
            gap: 6px;
            margin-bottom: 12px;
        }
        .color-swatch {
            width: 100%;
            aspect-ratio: 1;
            border-radius: 8px;
            cursor: pointer;
            border: 2px solid transparent;
            transition: all 0.25s;
            position: relative;
        }
        .color-swatch:hover { transform: scale(1.08); box-shadow: 0 4px 12px rgba(0,0,0,0.3); }
        .color-swatch.active { border-color: var(--accent-primary); box-shadow: 0 0 0 2px rgba(60,150,254,0.3); }

        /* ─── Welcome Screen ─── */
        .welcome-screen {
            position: absolute;
            inset: 0;
            background: var(--bg-primary);
            backdrop-filter: blur(10px);
            display: flex;
            align-items: center;
            justify-content: center;
            z-index: 1000;
        }
        .welcome-screen.hidden { display: none; }
        .welcome-content { text-align: center; max-width: 600px; padding: 40px; }
        .welcome-title {
            font-size: 42px;
            font-weight: 700;
            background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
            -webkit-background-clip: text;
            background-clip: text;
            -webkit-text-fill-color: transparent;
            margin-bottom: 16px;
        }
        .welcome-title svg { height: 48px; width: auto; -webkit-text-fill-color: initial; }
        .welcome-subtitle {
            font-size: 18px;
            color: var(--text-secondary);
            margin-bottom: 32px;
        }
        .supported-formats {
            display: flex;
            flex-wrap: wrap;
            gap: 6px;
            justify-content: center;
            margin-bottom: 32px;
        }
        .format-badge {
            background: var(--bg-tertiary);
            border: 1px solid var(--border-light);
            padding: 6px 12px;
            border-radius: 6px;
            font-size: 11px;
            font-weight: 600;
            font-family: 'IBM Plex Mono', monospace;
            color: var(--text-secondary);
        }

        /* ─── Split button ─── */
        .btn-split {
            display: flex;
            align-items: stretch;
            border-radius: 8px;
            overflow: visible;
            position: relative;
        }
        .btn-split .btn-split-main {
            border-radius: 8px 0 0 8px;
            border-right: none;
            padding: 7px 12px;
        }
        .btn-split .btn-split-arrow {
            width: 26px;
            border-radius: 0 8px 8px 0;
            border-left: 1px solid rgba(255,255,255,0.08);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 10px;
            cursor: pointer;
            transition: all 0.2s;
            padding: 0;
            flex-shrink: 0;
        }
        .btn-split .btn-split-arrow:hover { background: rgba(60,150,254,0.15); color: var(--accent-primary); }
        .btn-split-dropdown {
            display: none;
            position: absolute;
            top: calc(100% + 6px);
            left: 0;
            min-width: 100%;
            background: var(--bg-secondary);
            border: 1px solid var(--border-color);
            border-radius: 8px;
            overflow: hidden;
            box-shadow: 0 8px 24px rgba(0,0,0,0.5);
            z-index: 500;
            backdrop-filter: blur(12px);
        }
        .btn-split-dropdown.open { display: block; }
        .btn-split-dropdown button {
            width: 100%;
            padding: 10px 14px;
            background: transparent;
            border: none;
            color: var(--text-secondary);
            font-size: 12px;
            font-family: 'IBM Plex Sans', sans-serif;
            cursor: pointer;
            display: flex;
            align-items: center;
            gap: 8px;
            transition: background 0.15s;
            text-align: left;
            white-space: nowrap;
        }
        .btn-split-dropdown button:hover { background: rgba(60,150,254,0.08); color: var(--text-primary); }

        /* ─── Stats Panel ─── */
        .stats-panel {
            position: absolute;
            bottom: 24px;
            right: 20px;
            background: rgba(33,44,62,0.92);
            backdrop-filter: blur(16px);
            border: 1px solid var(--border-color);
            border-radius: 12px;
            padding: 14px 18px;
            min-width: 180px;
            z-index: 50;
        }
        .stat-item {
            display: flex;
            justify-content: space-between;
            margin-bottom: 6px;
            font-size: 12px;
        }
        .stat-item:last-child { margin-bottom: 0; }
        .stat-label { color: var(--text-tertiary); }
        .stat-value {
            color: var(--text-primary);
            font-weight: 500;
            font-family: 'IBM Plex Mono', monospace;
        }

        /* ─── Toast ─── */
        .toast {
            position: fixed;
            bottom: 100px;
            right: 20px;
            background: rgba(33,44,62,0.98);
            backdrop-filter: blur(20px);
            border: 1px solid var(--border-color);
            border-radius: 12px;
            padding: 14px 20px;
            display: flex;
            align-items: center;
            gap: 12px;
            box-shadow: var(--shadow-lg);
            z-index: 2000;
            animation: slideIn 0.3s ease;
        }
        .toast.success { border-color: var(--success); }
        .toast.error { border-color: var(--error); }
        @keyframes slideIn {
            from { transform: translateX(400px); opacity: 0; }
            to { transform: translateX(0); opacity: 1; }
        }

        /* ─── Clip Planes ─── */
        .clip-plane-row {
            display: flex;
            align-items: center;
            gap: 8px;
            margin-bottom: 10px;
            padding: 8px 10px;
            background: var(--bg-input);
            border-radius: 8px;
            border: 1px solid var(--border-light);
            transition: border-color 0.2s, box-shadow 0.2s;
        }
        .clip-plane-row.active {
            border-color: var(--clip-color, var(--accent-primary));
            box-shadow: 0 0 0 1px var(--clip-color, var(--accent-primary)) inset;
        }
        .clip-axis-label {
            font-size: 13px;
            font-weight: 700;
            font-family: 'IBM Plex Mono', monospace;
            width: 18px;
            text-align: center;
            flex-shrink: 0;
        }
        .clip-plane-row .slider { flex: 1; margin: 0; }
        .clip-value {
            font-size: 11px;
            font-family: 'IBM Plex Mono', monospace;
            color: var(--text-tertiary);
            width: 46px;
            text-align: right;
            flex-shrink: 0;
        }
        .clip-toggle {
            width: 28px;
            height: 28px;
            border-radius: 6px;
            border: 1px solid var(--border-light);
            background: var(--bg-input);
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 13px;
            flex-shrink: 0;
            transition: all 0.2s;
            color: var(--text-tertiary);
        }
        .clip-toggle.on {
            background: var(--clip-color, var(--accent-primary));
            border-color: transparent;
            color: #fff;
            box-shadow: 0 2px 8px rgba(0,0,0,0.3);
        }
        .clip-flip-btn {
            width: 24px;
            height: 24px;
            border-radius: 5px;
            border: 1px solid var(--border-light);
            background: var(--bg-input);
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 11px;
            flex-shrink: 0;
            transition: all 0.2s;
            color: var(--text-tertiary);
        }
        .clip-flip-btn:hover { border-color: var(--accent-primary); color: var(--accent-primary); }
        .clip-cap-row {
            display: flex;
            align-items: center;
            justify-content: space-between;
            margin-top: 4px;
            padding: 6px 0;
            font-size: 13px;
            color: var(--text-secondary);
        }

        /* ─── Collapsible ─── */
        .collapsible-header {
            display: flex;
            align-items: center;
            justify-content: space-between;
            cursor: pointer;
            user-select: none;
            padding: 4px 0;
            margin-bottom: 0;
        }
        .collapsible-header h3 { margin-bottom: 0; }
        .collapse-arrow {
            font-size: 11px;
            color: var(--text-tertiary);
            transition: transform 0.25s;
            display: inline-block;
        }
        .collapsible-header.open .collapse-arrow { transform: rotate(180deg); }
        .collapsible-body {
            overflow: hidden;
            max-height: 0;
            transition: max-height 0.3s ease, opacity 0.3s ease, margin-top 0.2s;
            opacity: 0;
            margin-top: 0;
        }
        .collapsible-body.open {
            max-height: 1000px;
            opacity: 1;
            margin-top: 12px;
        }

        /* ─── DICOM Panel ─── */
        .dicom-panel {
            position: absolute;
            bottom: 20px;
            left: 50%;
            transform: translateX(-50%);
            background: rgba(33,44,62,0.95);
            backdrop-filter: blur(20px);
            border: 1px solid var(--border-color);
            border-radius: 14px;
            padding: 10px 16px;
            z-index: 60;
            display: flex;
            align-items: center;
            gap: 10px;
            box-shadow: 0 8px 32px rgba(0,0,0,0.4);
            min-width: 360px;
            flex-wrap: wrap;
            justify-content: center;
        }
        .dicom-panel.hidden { display: none; }
        .dicom-panel-title {
            font-size: 11px;
            font-weight: 700;
            color: var(--accent-primary);
            text-transform: uppercase;
            letter-spacing: 1px;
            white-space: nowrap;
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .dicom-axis-group {
            display: flex;
            align-items: center;
            gap: 5px;
            font-size: 12px;
            flex-wrap: wrap;
        }
        .dicom-axis-label {
            font-weight: 700;
            font-size: 11px;
            width: 16px;
            text-align: center;
        }
        .dicom-thumb {
            width: 32px;
            height: 32px;
            border-radius: 6px;
            border: 1px solid var(--border-light);
            object-fit: cover;
            cursor: pointer;
            background: var(--bg-input);
        }
        .dicom-thumb.active {
            border-color: var(--accent-primary);
            box-shadow: 0 0 8px rgba(60,150,254,0.3);
        }
        .dicom-count {
            font-size: 10px;
            color: var(--text-tertiary);
            white-space: nowrap;
            font-family: 'IBM Plex Mono', monospace;
        }
        .dicom-toggle-btn {
            padding: 3px 8px;
            border: 1px solid var(--border-light);
            border-radius: 4px;
            background: var(--bg-input);
            color: var(--text-secondary);
            font-size: 10px;
            cursor: pointer;
            transition: all 0.2s;
            white-space: nowrap;
        }
        .dicom-toggle-btn:hover { background: var(--bg-tertiary); color: var(--text-primary); }
        .dicom-toggle-btn.active { background: var(--accent-primary); color: #fff; border-color: var(--accent-primary); }
        .dicom-slider-wrap {
            display: flex;
            align-items: center;
            gap: 4px;
        }
        .dicom-slider-wrap input[type=range] { width: 50px; height: 3px; accent-color: var(--accent-primary); }
        .dicom-sep { width: 1px; height: 24px; background: var(--border-light); }
        .dicom-clear-btn {
            padding: 3px 10px;
            border: 1px solid rgba(239,68,68,0.3);
            border-radius: 4px;
            background: rgba(239,68,68,0.08);
            color: var(--error);
            font-size: 10px;
            cursor: pointer;
            white-space: nowrap;
            transition: all 0.2s;
        }
        .dicom-clear-btn:hover { background: rgba(239,68,68,0.15); }
        .dicom-cut-btn {
            padding: 3px 6px;
            border: 1px solid var(--border-light);
            border-radius: 4px;
            background: var(--bg-input);
            color: var(--text-tertiary);
            font-size: 10px;
            cursor: pointer;
            white-space: nowrap;
            transition: all 0.2s;
        }
        .dicom-cut-btn:hover { background: var(--bg-tertiary); color: var(--text-primary); }
        .dicom-cut-btn.active {
            background: rgba(60,150,254,0.15);
            border-color: var(--accent-primary);
            color: var(--accent-primary);
        }
        .dicom-flip-btn {
            padding: 2px 6px;
            border: 1px solid var(--border-light);
            border-radius: 4px;
            background: var(--bg-input);
            color: var(--text-tertiary);
            font-size: 10px;
            cursor: pointer;
            transition: all 0.2s;
        }
        .dicom-flip-btn:hover { background: var(--bg-tertiary); color: var(--text-primary); }
        .dicom-flip-btn.active { color: var(--accent-primary); border-color: var(--accent-primary); }

        /* ─── Model List ─── */
        .model-item {
            background: var(--bg-input);
            border: 1px solid var(--border-light);
            border-radius: 10px;
            padding: 10px 12px;
            margin-bottom: 8px;
            transition: border-color 0.2s, box-shadow 0.2s;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .model-item-body { flex: 1; min-width: 0; }
        .model-item:hover { border-color: var(--border-color); }
        .model-item.active-model {
            border-color: var(--accent-primary);
            box-shadow: 0 0 0 1px var(--accent-primary) inset;
        }
        .model-item-header {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .model-color-dot {
            width: 10px;
            height: 10px;
            border-radius: 50%;
            flex-shrink: 0;
            border: 1px solid rgba(255,255,255,0.1);
        }
        .model-name {
            flex: 1;
            font-size: 12px;
            font-weight: 500;
            color: var(--text-primary);
            overflow: hidden;
            text-overflow: ellipsis;
            white-space: nowrap;
        }
        .model-format-tag {
            font-size: 9px;
            font-family: 'IBM Plex Mono', monospace;
            background: var(--bg-tertiary);
            color: var(--text-secondary);
            padding: 1px 6px;
            border-radius: 3px;
            font-weight: 600;
            flex-shrink: 0;
        }
        .model-actions {
            display: flex;
            gap: 4px;
            margin-top: 6px;
        }
        .model-action-btn {
            flex: 1;
            padding: 4px 8px;
            border-radius: 4px;
            border: 1px solid var(--border-light);
            background: var(--bg-input);
            color: var(--text-secondary);
            font-size: 10px;
            cursor: pointer;
            transition: all 0.2s;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 3px;
        }
        .model-action-btn:hover { border-color: var(--border-color); color: var(--text-primary); }
        .model-action-btn.active-select { background: var(--accent-primary); color: #fff; border-color: var(--accent-primary); }
        .model-action-btn.hidden-btn { opacity: 0.4; }
        .model-delete-btn {
            flex-shrink: 0;
            width: 28px;
            height: 28px;
            padding: 0;
            border-radius: 6px;
            border: 1px solid rgba(239,68,68,0.2);
            background: rgba(239,68,68,0.06);
            color: rgba(239,68,68,0.5);
            cursor: pointer;
            transition: all 0.2s;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .model-delete-btn:hover { background: rgba(239,68,68,0.12); border-color: var(--error); color: var(--error); }
        .models-empty {
            text-align: center;
            padding: 24px 12px;
            color: var(--text-tertiary);
            font-size: 13px;
        }

        /* ─── Delete Confirm Modal ─── */
        #deleteConfirmOverlay {
            display: none;
            position: fixed;
            inset: 0;
            background: rgba(0,0,0,0.6);
            backdrop-filter: blur(4px);
            z-index: 9999;
            align-items: center;
            justify-content: center;
        }
        #deleteConfirmOverlay.active { display: flex; }
        #deleteConfirmBox {
            background: var(--bg-secondary);
            border: 1px solid rgba(239,68,68,0.3);
            border-radius: 14px;
            padding: 28px 32px 24px;
            width: 340px;
            box-shadow: 0 24px 64px rgba(0,0,0,0.6);
            display: flex;
            flex-direction: column;
            gap: 16px;
            animation: deleteModalIn 0.18s cubic-bezier(0.4,0,0.2,1);
        }
        @keyframes deleteModalIn {
            from { opacity:0; transform: scale(0.92) translateY(8px); }
            to { opacity:1; transform: scale(1) translateY(0); }
        }
        #deleteConfirmBox .dcb-icon {
            width: 44px; height: 44px;
            background: rgba(239,68,68,0.1);
            border: 1px solid rgba(239,68,68,0.2);
            border-radius: 50%;
            display: flex; align-items: center; justify-content: center;
            margin: 0 auto;
        }
        #deleteConfirmBox .dcb-icon svg { width: 20px; height: 20px; fill: var(--error); }
        #deleteConfirmBox .dcb-title {
            font-size: 15px; font-weight: 600;
            color: var(--text-primary);
            text-align: center; margin: 0;
        }
        #deleteConfirmBox .dcb-subtitle {
            font-size: 12px; color: var(--text-secondary);
            text-align: center; margin: -8px 0 0; line-height: 1.5;
        }
        #deleteConfirmBox .dcb-name {
            font-size: 12px;
            background: var(--bg-input);
            border: 1px solid var(--border-light);
            border-radius: 6px;
            padding: 8px 12px;
            color: var(--text-secondary);
            text-align: center;
            overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
        }
        #deleteConfirmBox .dcb-actions { display: flex; gap: 10px; }
        #deleteConfirmBox .dcb-btn {
            flex: 1; padding: 9px 0;
            border-radius: 8px; border: none;
            font-size: 13px; font-weight: 500;
            cursor: pointer; transition: all 0.2s;
            font-family: 'IBM Plex Sans', sans-serif;
        }
        #deleteConfirmBox .dcb-btn-cancel {
            background: var(--bg-tertiary);
            border: 1px solid var(--border-light);
            color: var(--text-secondary);
        }
        #deleteConfirmBox .dcb-btn-cancel:hover { background: var(--bg-primary); color: var(--text-primary); }
        #deleteConfirmBox .dcb-btn-delete {
            background: rgba(239,68,68,0.1);
            border: 1px solid rgba(239,68,68,0.3);
            color: var(--error);
        }
        #deleteConfirmBox .dcb-btn-delete:hover { background: var(--error); color: #fff; }
        #deleteConfirmBox .dcb-no-show {
            display: flex; align-items: center; gap: 8px;
            justify-content: center;
        }
        #deleteConfirmBox .dcb-no-show input[type=checkbox] {
            display: flex !important;
            appearance: none;
            -webkit-appearance: none;
            width: 15px; height: 15px;
            border: 1.5px solid var(--text-tertiary);
            border-radius: 3px;
            background: transparent;
            cursor: pointer;
            flex-shrink: 0;
            position: relative;
            transition: all 0.15s;
        }
        #deleteConfirmBox .dcb-no-show input[type=checkbox]:checked {
            background: var(--accent-primary);
            border-color: var(--accent-primary);
        }
        #deleteConfirmBox .dcb-no-show input[type=checkbox]:checked::after {
            content: '';
            position: absolute;
            left: 3px; top: 0px;
            width: 5px; height: 9px;
            border: 2px solid #fff;
            border-top: none; border-left: none;
            transform: rotate(45deg);
        }
        #deleteConfirmBox .dcb-no-show label {
            font-size: 12px; color: var(--text-secondary);
            cursor: pointer; user-select: none;
        }

        .sync-group-row {
            display: flex;
            align-items: center;
            gap: 8px;
            padding: 8px 10px;
            border-radius: 8px;
            border: 1px solid var(--border-light);
            background: var(--bg-input);
            margin-bottom: 8px;
            font-size: 12px;
            color: var(--text-secondary);
        }
        .sync-group-row label { display: flex; align-items: center; gap: 6px; cursor: pointer; }
        .sync-group-row input[type=checkbox] { width:14px; height:14px; accent-color: var(--accent-primary); }

        /* ─── Slicer Layout ─── */
        .slicer-layout {
            display: none;
            position: fixed;
            inset: 0;
            top: 0;
            background: var(--bg-primary);
            z-index: 200;
            flex-direction: column;
        }
        .slicer-layout.active { display: flex; }

        .slicer-header {
            background: var(--bg-secondary);
            border-bottom: 1px solid var(--border-color);
            padding: 6px 14px;
            display: flex;
            align-items: center;
            gap: 10px;
            height: 44px;
            flex-shrink: 0;
            z-index: 10;
            flex-wrap: wrap;
        }
        .sh-title {
            font-size: 13px;
            font-weight: 700;
            color: var(--accent-primary);
            letter-spacing: -0.3px;
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .sh-sep { width:1px; height:20px; background: var(--border-light); }

        .slicer-btn {
            padding: 4px 10px;
            border: 1px solid var(--border-light);
            border-radius: 6px;
            background: var(--bg-input);
            color: var(--text-secondary);
            font-size: 11px;
            cursor: pointer;
            transition: all 0.2s;
            display: flex; align-items: center; gap: 4px;
            font-family: 'IBM Plex Sans', sans-serif;
        }
        .slicer-btn:hover { background: var(--bg-tertiary); color: var(--text-primary); border-color: var(--border-color); }
        .slicer-btn.active { background: var(--accent-primary); color: #fff; border-color: var(--accent-primary); }
        .slicer-btn.danger { border-color: rgba(239,68,68,0.3); }
        .slicer-btn.danger:hover { background: rgba(239,68,68,0.1); border-color: var(--error); color: var(--error); }

        .nrrd-label { font-size:9px; color:var(--text-tertiary); text-transform:uppercase; letter-spacing:.5px; white-space:nowrap; }
        .nrrd-opacity-slider { width:50px; accent-color: var(--accent-primary); }

        /* ─── Seg Panel ─── */
        #segPanel {
            position: absolute;
            top: 0; left: 0; bottom: 0;
            width: 260px;
            background: rgba(33,44,62,0.97);
            backdrop-filter: blur(16px);
            border-right: 1px solid var(--border-color);
            display: flex; flex-direction: column;
            z-index: 60;
            transform: translateX(-100%);
            transition: transform 0.28s cubic-bezier(.4,0,.2,1);
            box-shadow: 4px 0 32px rgba(0,0,0,0.4);
        }
        #segPanel.open { transform: translateX(0); }

        #segPanelTab {
            position: absolute;
            left: 100%; top: 50%;
            transform: translateY(-50%);
            background: var(--bg-secondary);
            border: 1px solid var(--border-color);
            border-left: none;
            border-radius: 0 8px 8px 0;
            padding: 14px 5px;
            cursor: pointer;
            display: flex; flex-direction: column; align-items: center; gap: 4px;
            user-select: none;
            transition: background .2s;
            writing-mode: vertical-lr;
            font-size: 10px; font-weight:600; letter-spacing:1px;
            color: var(--text-secondary);
            white-space:nowrap;
        }
        #segPanelTab:hover { background: rgba(60,150,254,0.08); color: var(--text-primary); }

        .seg-panel-header {
            padding: 12px 14px 8px;
            border-bottom: 1px solid var(--border-light);
            display: flex; align-items: center; justify-content: space-between;
            flex-shrink: 0;
        }
        .seg-panel-title {
            font-size: 12px; font-weight: 700; color: var(--accent-primary);
            letter-spacing: .5px; display: flex; align-items: center; gap: 6px;
        }
        .seg-panel-actions { display: flex; gap: 4px; }
        .seg-tiny-btn {
            background: var(--bg-input);
            border: 1px solid var(--border-light);
            border-radius: 4px; color: var(--text-secondary);
            font-size: 10px; padding: 2px 6px; cursor: pointer;
            transition: all .2s; white-space:nowrap;
        }
        .seg-tiny-btn:hover { background: var(--bg-tertiary); color: var(--text-primary); border-color: var(--border-color); }
        .seg-tiny-btn.danger:hover { background: rgba(239,68,68,0.1); border-color: var(--error); color: var(--error); }

        .seg-global-row {
            padding: 6px 14px;
            border-bottom: 1px solid var(--border-light);
            display: flex; flex-direction:column; gap:4px;
            flex-shrink:0;
        }
        .seg-global-row label { font-size:9px; color:var(--text-tertiary); text-transform:uppercase; letter-spacing:.5px; }
        .seg-slider-row { display:flex; align-items:center; gap:5px; }
        .seg-slider { flex:1; accent-color:var(--accent-primary); height:3px; }
        .seg-slider-val { font-family:monospace; font-size:10px; color:var(--text-secondary); min-width:30px; text-align:right; }

        #segList { flex: 1; overflow-y: auto; padding: 4px 0; }
        #segList::-webkit-scrollbar { width:4px; }
        #segList::-webkit-scrollbar-thumb { background: var(--bg-tertiary); border-radius:2px; }

        .seg-file-header {
            display: flex; align-items: center; gap: 5px;
            padding: 5px 14px 3px;
            cursor: pointer; user-select: none;
            border-top: 1px solid var(--border-light);
        }
        .seg-file-header:first-child { border-top: none; }
        .seg-file-chevron {
            font-size: 8px; color:var(--text-tertiary); transition: transform .2s; flex-shrink:0;
        }
        .seg-file-header.collapsed .seg-file-chevron { transform: rotate(-90deg); }
        .seg-file-icon { font-size:12px; flex-shrink:0; color: var(--text-secondary); }
        .seg-file-name {
            flex:1; font-size:11px; font-weight:500; color:var(--text-primary);
            overflow:hidden; text-overflow:ellipsis; white-space:nowrap;
        }
        .seg-file-eye {
            font-size:11px; cursor:pointer; opacity:.5; flex-shrink:0; padding:1px 3px;
            border-radius:3px; transition: opacity .2s;
        }
        .seg-file-eye:hover { opacity:1; background: rgba(255,255,255,0.05); }
        .seg-file-del {
            font-size:10px; cursor:pointer; color:rgba(239,68,68,0.4); flex-shrink:0;
            padding:1px 4px; border-radius:3px; transition: all .2s;
        }
        .seg-file-del:hover { color:var(--error); background: rgba(239,68,68,0.1); }

        .seg-labels-block { padding-bottom:4px; }
        .seg-labels-block.collapsed { display:none; }

        .seg-label-row {
            display:flex; align-items:center; gap:5px;
            padding: 3px 14px 3px 28px;
            transition: background .15s;
            cursor: default;
        }
        .seg-label-row:hover { background: rgba(255,255,255,0.03); }
        .seg-label-row.hidden-seg { opacity:.35; }

        .seg-color-swatch {
            width:13px; height:13px; border-radius:4px; flex-shrink:0;
            border: 1px solid var(--border-light); cursor:pointer;
            transition: transform .15s;
            position:relative;
        }
        .seg-color-swatch:hover { transform:scale(1.15); }
        .seg-color-input {
            position:absolute; inset:0; opacity:0; cursor:pointer; width:100%; height:100%;
            border:none; padding:0;
        }
        .seg-label-name {
            flex:1; font-size:11px; color:var(--text-secondary);
            overflow:hidden; text-overflow:ellipsis; white-space:nowrap;
        }
        .seg-label-opacity-slider { width:40px; accent-color:var(--accent-primary); height:3px; }
        .seg-label-eye {
            font-size:11px; cursor:pointer; opacity:.4; flex-shrink:0; padding:1px 3px; border-radius:3px;
        }
        .seg-label-eye:hover { opacity:1; background: rgba(255,255,255,0.05); }
        .seg-label-row.hidden-seg .seg-label-eye { opacity:.2; }

        .seg-count-badge {
            font-size:8px; background: var(--bg-tertiary); color: var(--text-secondary);
            border-radius:10px; padding:0 5px; font-family:monospace;
            flex-shrink:0;
        }
        .seg-add-btn {
            margin:6px 14px;
            width:calc(100% - 28px);
            padding:6px;
            background: var(--bg-input);
            border: 1px dashed var(--border-color);
            border-radius:8px;
            color: var(--text-secondary); font-size:11px; font-weight:500;
            cursor:pointer; transition:all .2s; text-align:center;
            flex-shrink:0;
        }
        .seg-add-btn:hover { background: var(--bg-tertiary); border-color: var(--accent-primary); color: var(--text-primary); }

        /* ─── Planes Panel ─── */
        #planesPanel {
            position: absolute;
            top: 0; right: 0; bottom: 0;
            width: 230px;
            background: rgba(33,44,62,0.97);
            backdrop-filter: blur(16px);
            border-left: 1px solid var(--border-color);
            display: flex; flex-direction: column;
            z-index: 60;
            transform: translateX(100%);
            transition: transform 0.28s cubic-bezier(.4,0,.2,1);
            box-shadow: -4px 0 32px rgba(0,0,0,0.4);
        }
        #planesPanel.open { transform: translateX(0); }

        #planesPanelTab {
            position: absolute;
            right: 100%; top: 50%;
            transform: translateY(-50%);
            background: var(--bg-secondary);
            border: 1px solid var(--border-color);
            border-right: none;
            border-radius: 8px 0 0 8px;
            padding: 14px 5px;
            cursor: pointer;
            writing-mode: vertical-rl;
            font-size: 10px; font-weight: 600; letter-spacing: 1px;
            color: var(--text-secondary);
            white-space: nowrap;
            user-select: none;
            transition: background .2s;
            text-orientation: mixed;
            transform: translateY(-50%) rotate(180deg);
        }
        #planesPanelTab:hover { background: rgba(60,150,254,0.08); color: var(--text-primary); }

        .planes-panel-header {
            padding: 12px 14px 8px;
            border-bottom: 1px solid var(--border-light);
            display: flex; align-items: center; justify-content: space-between;
            flex-shrink: 0;
        }
        .planes-panel-title {
            font-size: 12px; font-weight: 700; color: var(--accent-primary);
            letter-spacing: .5px; display: flex; align-items: center; gap: 6px;
        }

        .plane-card {
            margin: 6px 8px;
            background: var(--bg-input);
            border: 1px solid var(--border-light);
            border-radius: 10px;
            overflow: hidden;
            transition: border-color .2s;
            flex-shrink: 0;
        }
        .plane-card.active { border-color: var(--plane-color); }
        .plane-card-header {
            display: flex; align-items: center; gap: 6px;
            padding: 6px 10px;
            cursor: default;
        }
        .plane-dot {
            width: 8px; height: 8px; border-radius: 50%; flex-shrink: 0;
            background: var(--plane-color);
            box-shadow: 0 0 6px var(--plane-color);
        }
        .plane-name {
            flex: 1; font-size: 11px; font-weight: 500; color: var(--text-primary);
        }
        .plane-axis-badge {
            font-size: 8px; font-family: monospace;
            background: var(--bg-tertiary); color: var(--text-tertiary);
            border-radius: 3px; padding: 0 4px; flex-shrink: 0;
        }

        .plane-controls {
            padding: 0 10px 8px;
            display: flex; flex-direction: column; gap: 5px;
        }
        .plane-row {
            display: flex; align-items: center; gap: 5px;
        }
        .plane-row label {
            font-size: 9px; color: var(--text-tertiary); text-transform: uppercase;
            letter-spacing: .5px; min-width: 48px; flex-shrink: 0;
        }

        .plane-toggle {
            position: relative; width: 28px; height: 14px; flex-shrink: 0; cursor: pointer;
        }
        .plane-toggle input { display: none; }
        .plane-toggle-track {
            position: absolute; inset: 0;
            background: var(--bg-tertiary);
            border-radius: 7px;
            transition: background .2s;
        }
        .plane-toggle input:checked + .plane-toggle-track { background: var(--plane-color); }
        .plane-toggle-thumb {
            position: absolute; top: 1px; left: 1px;
            width: 10px; height: 10px; border-radius: 50%;
            background: #fff; transition: transform .2s;
            box-shadow: 0 1px 3px rgba(0,0,0,0.3);
        }
        .plane-toggle input:checked ~ .plane-toggle-thumb { transform: translateX(14px); }

        .plane-btn {
            flex: 1;
            background: var(--bg-input);
            border: 1px solid var(--border-light);
            border-radius: 4px; color: var(--text-secondary);
            font-size: 9px; padding: 2px 0; cursor: pointer;
            text-align: center;
            transition: all .2s;
        }
        .plane-btn:hover { background: var(--bg-tertiary); color: var(--text-primary); border-color: var(--border-color); }
        .plane-btn.active-btn {
            background: rgba(60,150,254,0.12);
            border-color: var(--accent-primary);
            color: var(--accent-primary);
        }
        .plane-btn.danger-btn:hover { background: rgba(239,68,68,0.1); border-color: var(--error); color: var(--error); }

        .plane-opacity-slider { flex: 1; accent-color: var(--plane-color); height: 2px; }

        .planes-global-row {
            margin: 4px 8px 8px;
            padding: 8px 10px;
            background: var(--bg-input);
            border: 1px solid var(--border-light);
            border-radius: 8px;
            display: flex; flex-direction: column; gap: 6px;
            flex-shrink: 0;
        }
        .planes-global-row label {
            font-size: 9px; color: var(--text-tertiary); text-transform: uppercase; letter-spacing: .5px;
        }
        .planes-global-btn {
            flex: 1; padding: 4px 0; text-align: center;
            background: var(--bg-input);
            border: 1px solid var(--border-light);
            border-radius: 4px; color: var(--text-secondary);
            font-size: 9px; cursor: pointer;
            transition: all .2s;
        }
        .planes-global-btn:hover { background: var(--bg-tertiary); color: var(--text-primary); border-color: var(--border-color); }

        /* ─── Slicer Grid ─── */
        .slicer-grid {
            flex: 1;
            display: grid;
            grid-template-columns: 1fr 1fr;
            grid-template-rows: 1fr 1fr;
            gap: 1px;
            background: var(--bg-primary);
            overflow: hidden;
        }

        .slicer-panel {
            position: relative;
            background: var(--bg-primary);
            overflow: hidden;
            cursor: crosshair;
            border: 1px solid transparent;
            transition: border-color 0.15s;
        }
        #slicerPanelZ  { border-color: rgba(59,130,246,0.2); }
        #slicerPanelY  { border-color: rgba(16,185,129,0.2); }
        #slicerPanelX  { border-color: rgba(239,68,68,0.2);  }
        #slicerPanel3D { border-color: rgba(60,150,254,0.15); }
        #slicerPanelZ:hover  { border-color: rgba(59,130,246,0.4); }
        #slicerPanelY:hover  { border-color: rgba(16,185,129,0.4); }
        #slicerPanelX:hover  { border-color: rgba(239,68,68,0.4);  }
        #slicerPanel3D:hover { border-color: rgba(60,150,254,0.3); }

        .slicer-panel canvas {
            display: block;
            width: 100% !important;
            height: 100% !important;
        }
        .slicer-panel-label {
            position: absolute;
            top: 5px; left: 6px;
            font-size: 9px;
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 1px;
            pointer-events: none;
            z-index: 5;
        }
        .slicer-panel-label.axial   { color: #3b82f6; }
        .slicer-panel-label.coronal { color: #10b981; }
        .slicer-panel-label.sagital { color: #ef4444; }
        .slicer-panel-label.three-d { color: var(--accent-primary); }

        .slicer-panel-info {
            position: absolute;
            bottom: 4px; left: 6px;
            font-size: 8px; font-family: 'IBM Plex Mono', monospace;
            color: var(--text-tertiary);
            pointer-events: none; z-index: 5;
        }

        .orient-label {
            position: absolute;
            font-size: 9px;
            font-weight: 700;
            font-family: 'IBM Plex Mono', monospace;
            pointer-events: none;
            z-index: 6;
            text-shadow: 0 0 4px rgba(0,0,0,0.8);
            opacity: 0.6;
        }
        .orient-label.axial   { color: #60a5fa; }
        .orient-label.coronal { color: #34d399; }
        .orient-label.sagital { color: #f87171; }
        .orient-label.top    { top: 18px; left: 50%; transform: translateX(-50%); }
        .orient-label.bottom { bottom: 18px; left: 50%; transform: translateX(-50%); }
        .orient-label.left2  { top: 50%; left: 4px; transform: translateY(-50%); }
        .orient-label.right2 { top: 50%; right: 4px; transform: translateY(-50%); }

        .slicer-crosshair {
            position: absolute; inset: 0;
            pointer-events: none; z-index: 4;
        }
        #slicerPanel3D { cursor: grab; }
        #slicerPanel3D:active { cursor: grabbing; }

        .slicer-sliders {
            background: var(--bg-secondary);
            border-top: 1px solid var(--border-color);
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 4px 14px;
            height: 34px;
            flex-shrink: 0;
        }
        .slicer-axis-ctrl {
            display: flex; align-items: center; gap: 5px;
            flex: 1;
        }
        .slicer-axis-ctrl label {
            font-size: 9px; font-weight:700; width: 48px; white-space:nowrap;
        }
        .slicer-axis-ctrl label.axial   { color: #3b82f6; }
        .slicer-axis-ctrl label.coronal { color: #10b981; }
        .slicer-axis-ctrl label.sagital { color: #ef4444; }
        .slicer-axis-ctrl input[type=range] {
            flex:1; accent-color: currentColor; height: 2px;
        }
        .slicer-axis-ctrl span { font-size:8px; font-family:monospace; color:var(--text-tertiary); width:28px; text-align:right; }

        /* ─── Floating Clip Panel ─── */
        .clip-planes-floating {
            position: fixed;
            top: 150px;
            left: 50%;
            transform: translateX(-50%);
            width: 340px;
            background: var(--bg-secondary);
            border: 1px solid var(--border-color);
            border-radius: 12px;
            backdrop-filter: blur(20px);
            box-shadow: 0 20px 50px rgba(0,0,0,0.5);
            z-index: 999;
            display: none;
        }
        .clip-planes-floating.active { display: block; }
        .clip-floating-header {
            background: var(--bg-tertiary);
            padding: 8px 12px;
            border-bottom: 1px solid var(--border-color);
            cursor: move;
            display: flex;
            align-items: center;
            justify-content: space-between;
            user-select: none;
            border-radius: 11px 11px 0 0;
        }
        .clip-floating-header h3 { font-size: 12px; font-weight: 600; margin: 0; color: var(--text-primary); }
        .clip-floating-controls { display: flex; gap: 3px; }
        .clip-floating-btn {
            width: 22px; height: 22px; border: none;
            background: var(--bg-input);
            color: var(--text-secondary); border-radius: 4px; cursor: pointer;
            display: flex; align-items: center; justify-content: center;
            font-size: 11px; transition: all 0.2s;
        }
        .clip-floating-btn:hover { background: var(--bg-tertiary); color: var(--text-primary); }
        .clip-floating-body { padding: 12px; max-height: 500px; overflow-y: auto; }
        .clip-floating-body.collapsed { display: none; }

        .btn-comenzar { background: var(--accent-primary); color: #fff; }
        .btn-comenzar:hover { background: var(--accent-secondary); }
        .btn-cargar-carpeta-bienvenida { background: var(--bg-tertiary); color: var(--text-primary); }
        .btn-cargar-carpeta-bienvenida:hover { background: var(--bg-primary); }
        .btn-cargar-header { background: var(--bg-tertiary); color: var(--text-primary); }
        .btn-cargar-header:hover { background: var(--bg-primary); }
        .btn-anadir-header { background: var(--bg-tertiary); color: var(--text-primary); }
        .btn-anadir-header:hover { background: var(--bg-primary); }
        .btn-dicom-header { background: var(--bg-tertiary); color: var(--text-primary); }
        .btn-dicom-header:hover { background: var(--bg-primary); }
        .btn-limpiar { background: var(--bg-tertiary); color: var(--text-primary); }
        .btn-limpiar:hover { background: var(--bg-primary); }
        .btn-exportar { background: var(--bg-tertiary); color: var(--text-primary); }
        .btn-exportar:hover { background: var(--bg-primary); }
        .btn-sincronizar { background: var(--bg-tertiary); color: var(--text-primary); }
        .btn-sincronizar:hover { background: var(--bg-primary); }
        .btn-reset-clip { background: var(--bg-tertiary); color: var(--text-primary); }
        .btn-reset-clip:hover { background: var(--bg-primary); }

        @media (max-width: 768px) {
            .header { padding: 6px 10px; gap: 4px; }
            .logo { font-size: 14px; }
            .logo img { height: 26px; }
            .toolbar { padding: 0 6px; gap: 2px; }
            .tool-btn { width: 30px; height: 30px; font-size: 13px; }
            .btn { padding: 5px 10px; font-size: 11px; }
            .panel-drawer .panel-inner { width: 280px; }
            .panel-drawer { --panel-w: 280px; }
            .measurement-panel { width: 260px; left: 10px; }
            .dicom-panel { min-width: auto; padding: 8px 12px; flex-wrap: wrap; }
            .dicom-axis-group { flex-wrap: wrap; }
            .slicer-header { flex-wrap: wrap; height: auto; padding: 4px 8px; gap: 4px; }
            .slicer-sliders { flex-direction: column; height: auto; padding: 4px 8px; gap: 3px; }
            .slicer-axis-ctrl { width: 100%; }
            .stats-panel { bottom: 10px; right: 10px; padding: 8px 12px; min-width: 120px; }
            .stats-panel .stat-item { font-size: 10px; }
            .welcome-title { font-size: 28px; }
            .welcome-content { padding: 20px; }
            .clip-planes-floating { width: 280px; top: 80px; }
            #segPanel { width: 220px; }
            #planesPanel { width: 200px; }
            .slicer-grid { grid-template-columns: 1fr; grid-template-rows: 1fr 1fr 1fr 1fr; }
        }
        @media (max-width: 480px) {
            .header-actions { gap: 3px; }
            .btn-split .btn-split-main { padding: 3px 6px; font-size: 10px; }
            .btn-split .btn-split-arrow { width: 20px; font-size: 7px; }
            .panel-drawer .panel-inner { width: 250px; padding: 10px 10px 50px; }
            .panel-drawer { --panel-w: 250px; }
            .dicom-panel .dicom-panel-title { font-size: 9px; }
            .dicom-slider-wrap input[type=range] { width: 35px; }
        }
        /* ─── Ajustes para el Visor Médico ─── */
#slicer3DContainer {
    width: 100%;
    height: 100%;
    position: relative;
    background: var(--bg-primary);
}
#slicer3DContainer canvas {
    display: block;
    width: 100% !important;
    height: 100% !important;
}
#panel3D {
    cursor: grab;
    background: var(--bg-primary);
}
#panel3D:active {
    cursor: grabbing;
}
/* Sincronizar sliders inferiores */
.slicer-sliders input[type="range"] {
    height: 2px;
    background: var(--bg-tertiary);
    border-radius: 2px;
    outline: none;
    -webkit-appearance: none;
    appearance: none;
}
.slicer-sliders input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--accent-primary);
    cursor: pointer;
}
.slicer-sliders input[type="range"]::-moz-range-thumb {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--accent-primary);
    cursor: pointer;
    border: none;
}