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.option-indicator{background:var(--color-primary);border-color:var(--color-primary)}.question-option.selected .option-indicator:after{color:#fff;content:"✓";font-size:14px;font-weight:700;left:50%;position:absolute;top:50%;transform:translate(-50%,-50%)}.option-text{color:var(--color-text-main);font-size:1rem}.quiz-navigation{background:var(--color-bg-base);border-top:1px solid var(--color-border);padding:var(--spacing-4) var(--spacing-5)}.quiz-nav-buttons{align-items:center;display:flex;justify-content:space-between;margin-bottom:var(--spacing-4)}.quiz-nav-button{border:none;border-radius:var(--radius-md);cursor:pointer;font-size:.95rem;font-weight:600;padding:var(--spacing-2) var(--spacing-4);transition:all 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var(--transition-fast);backdrop-filter:blur(4px);-webkit-backdrop-filter:blur(4px);background:#0f172a66;bottom:0;display:flex;justify-content:center;left:0;padding:var(--spacing-3);position:fixed;right:0;top:0;z-index:1000}.submit-modal{animation:slideUp var(--transition-normal);background:var(--color-bg-surface);border:1px solid var(--color-border);border-radius:var(--radius-xl);box-shadow:var(--shadow-lg);max-width:500px;padding:var(--spacing-6);width:100%}.submit-modal-title{color:var(--color-text-main);font-size:1.5rem;font-weight:600;margin-bottom:var(--spacing-3)}.submit-modal-message{color:var(--color-text-muted);font-size:1rem;line-height:1.6;margin-bottom:var(--spacing-2)}.submit-modal-warning{background:#f59e0b1a;border-left:4px solid var(--color-warning);color:var(--color-warning);font-size:.9rem;margin:var(--spacing-4) 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