.knowledge-check-container {
    width: 100%;
    margin-top: 1rem;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.skeleton-loader {
    width: 100%;
    height: 120px;
    background-color: var(--nexus-card);
    border-radius: 8px;
    position: relative;
    overflow: hidden;
    border: 1px solid rgba(255,255,255,0.05);
}

.skeleton-loader .shimmer {
    position: absolute;
    top: 0;
    left: -100%;
    width: 50%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.08), transparent);
    animation: loadingShimmer 1.5s infinite ease-in-out;
}

@keyframes loadingShimmer {
    100% { left: 200%; }
}

.quiz-block {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    padding: 1rem;
    background-color: var(--nexus-card);
    border-radius: 8px;
    border: 1px solid rgba(255,255,255,0.1);
    transition: all 0.3s ease;
}

.quiz-block.state-correct {
    border-color: var(--nexus-neon);
    box-shadow: 0 0 10px rgba(0, 255, 153, 0.1);
}

.quiz-block.state-incorrect {
    border-color: rgba(255, 60, 60, 0.6);
    animation: shakePulse 0.4s ease-in-out;
}

@keyframes shakePulse {
    0% { transform: translateX(0); }
    25% { transform: translateX(-4px); box-shadow: -4px 0 10px rgba(255,60,60,0.3); }
    50% { transform: translateX(4px); box-shadow: 4px 0 10px rgba(255,60,60,0.3); }
    75% { transform: translateX(-4px); box-shadow: -4px 0 10px rgba(255,60,60,0.3); }
    100% { transform: translateX(0); }
}

.options-container {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.quiz-option {
    padding: 0.8rem;
    background-color: var(--nexus-card);
    border: 1px solid rgba(255,255,255,0.1);
    color: var(--nexus-text);
    border-radius: 6px;
    cursor: pointer;
    text-align: left;
    transition: all 0.2s;
    font-family: var(--nexus-font-sans);
}

.quiz-option:hover:not(:disabled) {
    background-color: rgba(255,255,255,0.05);
}

.quiz-option:disabled {
    cursor: default;
}

.option-correct {
    background-color: rgba(0, 255, 153, 0.15) !important;
    border-color: var(--nexus-neon) !important;
    color: white;
}

.option-incorrect {
    background-color: rgba(255, 60, 60, 0.15) !important;
    border-color: #ff3c3c !important;
    color: white;
}

.option-revealed-correct {
    border-color: var(--nexus-neon) !important;
    border-style: dashed;
}

.option-faded {
    opacity: 0.5;
}