.scaffold-container {
    margin-top: var(--spacing-4);
    border-top: 1px solid var(--color-gray-200);
}

.scaffold-level {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    padding: var(--spacing-3) var(--spacing-6);
    background-color: var(--color-gray-100);
    border-bottom: 1px solid var(--color-gray-200);
}

.scaffold-level-label {
    font-size: var(--font-size-sm);
    color: var(--color-gray-600);
}

.scaffold-level-badge {
    padding: var(--spacing-1) var(--spacing-3);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    border-radius: var(--radius-full);
    color: white;
}

.scaffold-level-4 .scaffold-level-badge { background-color: var(--color-scaffold-4); }
.scaffold-level-3 .scaffold-level-badge { background-color: var(--color-scaffold-3); }
.scaffold-level-2 .scaffold-level-badge { background-color: var(--color-scaffold-2); }
.scaffold-level-1 .scaffold-level-badge { background-color: var(--color-scaffold-1); }

.scaffold-steps {
    padding: var(--spacing-4) var(--spacing-6);
}

.scaffold-step {
    display: flex;
    gap: var(--spacing-4);
    padding: var(--spacing-4);
    margin-bottom: var(--spacing-3);
    background-color: var(--color-gray-50);
    border-radius: var(--radius-lg);
    border-left: 4px solid var(--color-primary-400);
}

.scaffold-step.completed {
    border-left-color: var(--color-success-500);
    background-color: var(--color-success-50);
}

.scaffold-step.active {
    border-left-color: var(--color-primary-600);
    background-color: var(--color-primary-50);
    box-shadow: var(--shadow-md);
}

.scaffold-step.locked {
    opacity: 0.5;
    border-left-color: var(--color-gray-300);
}

.step-number {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-bold);
    color: white;
    background-color: var(--color-primary-500);
    border-radius: var(--radius-full);
    flex-shrink: 0;
}

.scaffold-step.completed .step-number { background-color: var(--color-success-500); }
.scaffold-step.locked .step-number { background-color: var(--color-gray-400); }

.step-instruction {
    font-size: var(--font-size-sm);
    color: var(--color-gray-600);
    margin-bottom: var(--spacing-2);
}

.step-math {
    font-size: var(--font-size-lg);
    color: var(--color-gray-800);
}

.step-input {
    width: 120px;
    padding: var(--spacing-2) var(--spacing-3);
    font-size: var(--font-size-base);
    text-align: center;
    border: 2px solid var(--color-gray-300);
    border-radius: var(--radius-md);
}

.scaffold-toggle-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    padding: var(--spacing-2) var(--spacing-4);
    font-size: var(--font-size-sm);
    color: var(--color-gray-600);
    border-radius: var(--radius-md);
}

.scaffold-toggle {
    padding: var(--spacing-2) var(--spacing-6);
    background-color: var(--color-gray-50);
}

.scaffold-toggle-icon {
    transition: transform var(--transition-fast);
}

.scaffold-toggle-btn.expanded .scaffold-toggle-icon {
    transform: rotate(180deg);
}