:root{--bg-primary: hsl(222, 28%, 10%);--bg-secondary: hsl(222, 25%, 14%);--bg-tertiary: hsl(222, 20%, 20%);--border-color: hsl(222, 15%, 26%);--text-primary: hsl(210, 30%, 98%);--text-secondary: hsl(215, 16%, 76%);--text-muted: hsl(215, 12%, 55%);--accent-color: hsl(245, 82%, 67%);--accent-hover: hsl(245, 85%, 72%);--accent-light: rgba(99, 102, 241, .15);--warning-color: hsl(38, 92%, 50%);--warning-light: rgba(245, 158, 11, .15);--success-color: hsl(142, 70%, 45%);--success-light: rgba(16, 185, 129, .15);--error-color: hsl(350, 75%, 55%);--error-light: rgba(239, 68, 68, .15);--shadow-sm: 0 2px 4px rgba(0, 0, 0, .15);--shadow-md: 0 4px 12px rgba(0, 0, 0, .25);--shadow-lg: 0 10px 30px rgba(0, 0, 0, .4);--border-radius-sm: 6px;--border-radius-md: 10px;--border-radius-lg: 16px;--border-radius-circle: 50%;--font-sans: "Outfit", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;--font-mono: "Fira Code", Consolas, monospace;--viewport-bg: #0b0f19;--grid-dot-color: rgba(255, 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cubic-bezier(.18,.89,.32,1.25)}.toast.success{border-left-color:var(--success-color)}.toast.error{border-left-color:var(--error-color)}.toast.warning{border-left-color:var(--warning-color)}.builder-section{background-color:var(--bg-tertiary);border:1px solid var(--border-color);border-radius:var(--border-radius-md);padding:18px;margin-top:14px}.question-builder-card{background-color:var(--bg-primary);border:1px solid var(--border-color);border-radius:var(--border-radius-md);padding:16px;display:flex;flex-direction:column;gap:12px;position:relative;margin-top:12px}.question-builder-card .remove-q-btn{position:absolute;top:12px;right:12px;cursor:pointer;background:transparent;border:none;color:var(--error-color);font-size:16px;font-weight:700}.student-question-card{background-color:var(--bg-primary);border:1px solid var(--border-color);border-radius:var(--border-radius-md);padding:20px 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p{font-size:13px;color:var(--text-secondary);line-height:1.4}.module-header-actions{display:flex;gap:10px}.select-transfer{font-family:var(--font-sans);font-size:12px;background-color:var(--bg-tertiary);border:1px solid var(--border-color);color:var(--text-primary);padding:4px 8px;border-radius:4px;outline:none;cursor:pointer;max-width:160px;transition:all .15s ease}.select-transfer:hover{border-color:var(--accent-color)}.select-transfer:focus{border-color:var(--accent-color)}.module-exercises-table,#progress-table,#users-table{font-size:12.5px!important;width:100%}.module-exercises-table th,#progress-table th,#users-table th{padding:10px 12px!important;font-size:11px!important;font-weight:600}.module-exercises-table td,#progress-table td,#users-table td{padding:8px 12px!important}.module-exercises-table select.select-transfer{font-size:11px!important;padding:3px 6px!important;max-width:140px}.module-exercises-table .diff-badge,#progress-table .diff-badge,#users-table 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var(--border-color);border-radius:var(--border-radius-lg);padding:24px 40px 40px;width:90%;max-width:440px;text-align:center;box-shadow:0 20px 25px -5px #00000080,0 10px 10px -5px #00000080;position:relative;overflow:hidden;animation:slideDown .3s cubic-bezier(.18,.89,.32,1.15)}.server-loading-card:before{content:"";position:absolute;top:0;left:0;width:100%;height:4px;background:linear-gradient(90deg,var(--accent-color),var(--warning-color))}.gear-animation-container{display:flex;justify-content:center;align-items:center;height:90px;position:relative;margin-bottom:24px}.gear{position:absolute;transform-origin:center}.gear-large{width:80px;height:80px;fill:var(--accent-color);animation:rotateClockwise 10s linear infinite;left:calc(50% - 52px);top:calc(50% - 40px)}.gear-small{width:50px;height:50px;fill:var(--warning-color);animation:rotateCounterClockwise 6.25s linear infinite;left:calc(50% + 12px);top:calc(50% - 15px)}@keyframes 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#ef444433}.cancel-loading-btn.hidden{display:none!important}.db-status-badge{display:flex;align-items:center;gap:8px;background-color:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--border-radius-md);padding:6px 12px;font-size:12.5px;font-weight:500;color:var(--text-secondary);height:36px;box-sizing:border-box;user-select:none;transition:all .3s ease}.db-status-dot{width:8px;height:8px;border-radius:50%;position:relative}.db-status-badge.connected{border-color:#10b9814d;color:var(--text-primary)}.db-status-badge.connected .db-status-dot{background-color:var(--success-color);box-shadow:0 0 8px var(--success-color);animation:pulse-green 2s infinite}.db-status-badge.offline{border-color:#ef44444d;background-color:#ef44440d}.db-status-badge.offline .db-status-dot{background-color:var(--error-color);box-shadow:0 0 8px var(--error-color)}@keyframes pulse-green{0%{box-shadow:0 0 #10b981b3}70%{box-shadow:0 0 0 6px #10b98100}to{box-shadow:0 0 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12px;cursor:grab;user-select:none;transition:all .2s ease;font-size:12.5px;color:var(--text-secondary)}.cad-palette-item:hover{border-color:var(--accent-color);color:var(--text-primary);background-color:var(--accent-light);transform:translateY(-1px)}.cad-palette-item-icon{font-size:18px;width:24px;text-align:center}.cad-canvas-container{position:relative;background-color:var(--viewport-bg);border:2px solid var(--border-color);border-radius:var(--border-radius-md);overflow:hidden;display:flex;flex-direction:column}.cad-canvas-toolbar{display:flex;justify-content:space-between;align-items:center;background-color:var(--bg-secondary);border-bottom:1px solid var(--border-color);padding:8px 16px;z-index:10}.cad-canvas-toolbar-btn{display:flex;align-items:center;gap:6px;font-size:11px}.cad-canvas-viewport{flex-grow:1;width:100%;height:100%;position:relative;cursor:url(data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIyNCIgaGVpZ2h0PSIyNCIgdmlld0JveD0iMCAwIDI0IDI0Ij48cGF0aCBkPSJNMTIgMnYyME0yIDEyaDIwIiBzdHJva2U9IiNmZmZmZmYiIHN0cm9rZS13aWR0aD0iMyIgc3Ryb2tlLWxpbmVjYXA9InJvdW5kIi8+PHBhdGggZD0iTTEyIDJ2MjBNMiAxMmgyMCIgc3Ryb2tlPSIjMDAwMDAwIiBzdHJva2Utd2lkdGg9IjEiIHN0cm9rZS1saW5lY2FwPSJyb3VuZCIvPjwvc3ZnPg==) 12 12,crosshair;overflow:hidden;touch-action:none}.cad-svg-canvas{width:100%;height:auto;min-height:100%;display:block;overflow:visible!important;touch-action:none}.cad-properties-panel{background-color:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--border-radius-md);padding:16px;display:flex;flex-direction:column;gap:16px;overflow-y:auto}.cad-properties-title{font-size:13px;font-weight:700;color:var(--warning-color);letter-spacing:.5px;text-transform:uppercase;border-bottom:1px solid var(--border-color);padding-bottom:8px}.cad-comp-group{cursor:pointer;pointer-events:bounding-box;color:var(--cad-stroke-color)}.cad-comp-selection-box{fill:none;stroke:transparent;stroke-width:2;stroke-dasharray:4;transition:stroke .2s ease}.cad-comp-group:hover .cad-comp-selection-box{stroke:#6366f166}.cad-comp-group.selected .cad-comp-selection-box{stroke:transparent!important;stroke-width:2;filter:none!important}.cad-selection-adornments{display:none;pointer-events:none!important}.cad-resize-handle{pointer-events:auto!important}#cad-canvas .cad-comp-group:hover .cad-selection-adornments{display:block}#cad-canvas .cad-comp-group:hover .cad-selection-outline{stroke:#6366f166}#cad-canvas .cad-comp-group.selected .cad-selection-adornments{display:block}#cad-canvas .cad-comp-group.selected .cad-selection-outline{stroke:var(--accent-color);filter:drop-shadow(0 0 2px var(--accent-color))}#cad-canvas .cad-comp-group:hover .cad-comp-selection-box{stroke:transparent!important}.cad-comp-label{font-size:11px;font-weight:700;fill:var(--accent-color);font-family:var(--font-sans)}.cad-comp-value{font-size:10px;fill:var(--text-muted);font-family:var(--font-sans)}.cad-comp-symbol{fill:none;stroke:var(--cad-stroke-color);stroke-width:2;transition:stroke .25s ease,fill .25s ease}.cad-comp-group.active .cad-comp-symbol{stroke:var(--success-color);filter:drop-shadow(0 0 3px rgba(52,211,153,.5))}.cad-comp-group.active[data-type=thermal_overload] .cad-comp-symbol,.cad-comp-group.active[data-type=thermal_overload_3p] .cad-comp-symbol{stroke:var(--error-color);filter:drop-shadow(0 0 3px rgba(239,68,68,.5))}.cad-comp-group.active[data-type=thermal_overload] .cad-comp-text,.cad-comp-group.active[data-type=thermal_overload] .cad-comp-label,.cad-comp-group.active[data-type=thermal_overload_3p] .cad-comp-text,.cad-comp-group.active[data-type=thermal_overload_3p] .cad-comp-label{fill:var(--error-color)}.cad-comp-group.faulty .cad-comp-symbol{stroke:var(--error-color)!important}.cad-comp-symbol-filled{fill:var(--bg-tertiary);stroke:var(--cad-stroke-color);stroke-width:2}.cad-comp-group.active .cad-comp-symbol-filled{fill:var(--success-light);stroke:var(--success-color)}.cad-comp-text{font-family:var(--font-sans);font-size:11px;font-weight:600;fill:var(--cad-stroke-color);text-anchor:middle}.cad-comp-group.active .cad-comp-text,.cad-comp-group.active .pilot-light-bulb{fill:var(--success-color)}.power-supply-led{fill:#6b7280;transition:fill .25s ease}.cad-comp-group.active .power-supply-led{fill:#22c55e}.cad-comp-group.dragging{opacity:.5;filter:drop-shadow(0 0 8px rgba(99,102,241,.4));cursor:grabbing!important}.cad-wire-path{fill:none;stroke:var(--cad-stroke-color);stroke-width:2.5;stroke-linecap:round;stroke-linejoin:round;cursor:pointer;transition:stroke .2s ease,stroke-width .2s ease}.cad-wire-path:hover{stroke:var(--warning-color);stroke-width:4}.cad-wire-path.selected{stroke:var(--error-color);stroke-width:4;stroke-dasharray:4 2}.cad-wire-path.live-high{stroke:#f59e0b;stroke-width:3;filter:drop-shadow(0 0 3px rgba(245,158,11,.6))}.cad-wire-path.live-neutral{stroke:#3b82f6;stroke-width:2.5}.cad-wire-path.faulty-open{stroke:#f59e0b!important;stroke-dasharray:4 4}.cad-wire-path.faulty-grounded{stroke:#10b981!important;stroke-width:3px!important}.cad-terminal-point{fill:var(--bg-secondary);stroke:var(--cad-stroke-color);stroke-width:1.5;transition:all .2s ease;cursor:pointer;r:5px;touch-action:none}.cad-terminal-point:hover{fill:var(--accent-color);stroke:#fff;r:6px}.cad-terminal-point.connected{fill:var(--success-color);stroke:var(--cad-stroke-color)}.cad-terminal-point.unscrewed-terminal{fill:var(--bg-secondary);stroke:var(--cad-stroke-color);r:10px}.cad-terminal-point.connecting-source{fill:var(--warning-color);stroke:#fff;r:7;animation:pulse 1s infinite alternate}.cad-terminal-point.loose-terminal{fill:#f59e0b!important;stroke:#f59e0b!important;stroke-width:2px!important;stroke-dasharray:2 2;r:6!important;animation:pulse-loose-terminal 1.2s ease-in-out infinite}@keyframes pulse-loose-terminal{0%,to{opacity:1}50%{opacity:.4}}.cad-terminal-visible-marker{fill:var(--bg-secondary);stroke:var(--border-color);stroke-width:1.5;transition:all .2s ease}.cad-terminal-point:hover+.cad-terminal-visible-marker{fill:var(--accent-color)!important;stroke:#fff!important;r:6!important}.cad-terminal-visible-marker.connected{fill:var(--success-color)!important;stroke:var(--border-color)!important}.cad-terminal-visible-marker.connecting-source{fill:var(--warning-color)!important;stroke:#fff!important;r:7!important;animation:pulse 1s infinite alternate}.cad-terminal-visible-marker.probe-red-attached{fill:#ef4444!important;stroke:#fff!important;r:8!important}.cad-terminal-visible-marker.probe-black-attached{fill:#1f2937!important;stroke:#fff!important;r:8!important}.cad-terminal-visible-marker.loose-terminal{fill:#f59e0b!important;stroke:#f59e0b!important}.cad-terminal-visible-marker.unscrewed-terminal{stroke:var(--warning-color)!important;stroke-width:1.8px!important;fill:#0b0f19!important;r:5px!important}body.dragging-active .cad-comp-group{pointer-events:visiblePainted!important}body.dragging-active .cad-comp-selection-box,body.dragging-active .cad-comp-symbol,body.dragging-active .cad-comp-symbol-filled,body.dragging-active .cad-comp-text,body.dragging-active .cad-comp-label,body.dragging-active .cad-comp-value,body.dragging-active .cad-wire-path,body.dragging-active .attached-probe-stylus{pointer-events:none!important}body.dragging-active .cad-terminal-point{pointer-events:all!important}#circuit-board-area.screwdriver-active-cursor .cad-comp-selection-box,body.screwdriver-active-cursor .cad-comp-selection-box,body.screwdriver-active-cursor .cad-comp-symbol,body.screwdriver-active-cursor .cad-comp-symbol-filled,body.screwdriver-active-cursor .cad-comp-text,body.screwdriver-active-cursor .cad-comp-label,body.screwdriver-active-cursor .cad-comp-value,body.screwdriver-active-cursor .cad-wire-path,body.screwdriver-active-cursor .attached-probe-stylus{pointer-events:none!important}body.screwdriver-active-cursor 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var(--border-color);border-radius:var(--border-radius-md);padding:16px;position:relative;display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:480px}.circuit-board-wrapper.drag-hover{border-color:var(--accent-color);background-color:#6366f105}.virtual-multimeter-overlay{position:absolute;bottom:16px;right:16px;width:220px;background-color:var(--dmm-bg);border:2px solid var(--dmm-border);border-radius:var(--border-radius-md);padding:12px;color:var(--dmm-text);box-shadow:var(--shadow-lg);font-family:var(--font-mono);z-index:20;animation:slideUp .3s cubic-bezier(.18,.89,.32,1.28);touch-action:none}#multimeter-readout-panel{position:fixed;z-index:9999}.multimeter-title{font-size:9px;font-weight:700;color:#ef4444;margin-bottom:6px;letter-spacing:.5px}.multimeter-screen{background-color:var(--dmm-screen-bg);border:1px solid var(--dmm-screen-border);padding:8px 12px;border-radius:4px;text-align:right;margin-bottom:8px;box-shadow:inset 0 2px 4px 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