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#0000000d;z-index:5}.sidebar-header{padding:1.5rem;border-bottom:1px solid #e2e8f0;background-color:#eff6ff;flex-shrink:0}.sidebar-header h2{margin:0;font-size:1.25rem;font-weight:700;color:#1e3a8a}.interactive-timer-container{display:flex;flex-direction:column;align-items:center;padding:1.5rem 1rem;margin:1rem;background-color:#f1f5f9;border-radius:1rem;border:1px solid #e2e8f0;flex-shrink:0;transition:background-color .3s ease}.timer-svg-wrapper{position:relative;width:120px;height:120px;display:flex;justify-content:center;align-items:center}.timer-svg{transform:rotate(-90deg)}.timer-track{fill:none;stroke:#e2e8f0;stroke-width:8}.timer-progress-bar{fill:none;stroke:#3b82f6;stroke-width:8;stroke-linecap:round;transition:stroke-dashoffset 1s 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.2s}.nav-button:hover{background-color:#f1f5f9}.nav-button.active{background-color:#2563eb;color:#fff;font-weight:500;box-shadow:0 4px 6px -1px #0000001a}.main-content{flex:1;height:100%;display:flex;justify-content:center;align-items:center;padding:2rem;overflow:hidden;position:relative}.mcq-card{width:100%;max-width:800px;height:100%;max-height:750px;display:flex;flex-direction:column;background-color:#fff;border-radius:1rem;box-shadow:0 10px 25px -5px #0000001a;border:1px solid #f1f5f9;overflow:hidden}.mcq-body{flex:1;overflow-y:auto;padding:2.5rem 2.5rem 1rem}.mcq-header{margin-bottom:2rem}.question-counter{font-size:.875rem;font-weight:600;color:#3b82f6;text-transform:uppercase;letter-spacing:.05em}.question-text{font-size:1.5rem;font-weight:700;color:#0f172a;margin-top:.75rem;line-height:1.5}.options-container{display:flex;flex-direction:column;gap:1rem}.option-button{width:100%;text-align:left;padding:1.25rem;border-radius:.75rem;border:2px solid 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