:root {
    --hbia-bg: #f5f9ff;
    --hbia-card: #ffffff;
    --hbia-border: #d8e5ff;
    --hbia-primary: #2b7bff;
    --hbia-secondary: #6c7a89;
    --hbia-success: #1abc9c;
    --hbia-error: #e74c3c;
    --hbia-text: #1f2d3d;
}

@media (prefers-color-scheme: dark) {
    :root {
        --hbia-bg: #0f172a;
        --hbia-card: #1e293b;
        --hbia-border: #334155;
        --hbia-primary: #3b82f6;
        --hbia-secondary: #94a3b8;
        --hbia-text: #e2e8f0;
    }
}

.hbia-quiz-wrapper {
    background: var(--hbia-bg);
    padding: 24px;
    border-radius: 12px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.05);
    color: var(--hbia-text);
}

.hbia-quiz-header h2 {
    margin: 0 0 8px;
    color: var(--hbia-primary);
}

.hbia-round {
    font-weight: 600;
    color: var(--hbia-secondary);
}

.hbia-quiz-questions {
    display: grid;
    gap: 12px;
    margin: 16px 0;
}

.hbia-question-card {
    background: var(--hbia-card);
    border: 1px solid var(--hbia-border);
    border-radius: 10px;
    padding: 16px;
    transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.hbia-question-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0,0,0,0.05);
}

.hbia-question-text {
    font-weight: 600;
    margin-bottom: 10px;
}

.hbia-choices {
    display: grid;
    gap: 8px;
}

.hbia-choice {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 12px;
    border: 1px solid var(--hbia-border);
    border-radius: 8px;
    cursor: pointer;
    transition: border-color 0.2s ease, background 0.2s ease;
}

.hbia-choice input {
    accent-color: var(--hbia-primary);
}

.hbia-choice:hover {
    border-color: var(--hbia-primary);
    background: rgba(43,123,255,0.05);
}

.hbia-feedback {
    margin-top: 8px;
    font-weight: 600;
}

.hbia-question-card.hbia-correct {
    border-color: var(--hbia-success);
    background: rgba(26,188,156,0.08);
}

.hbia-question-card.hbia-wrong {
    border-color: var(--hbia-error);
    background: rgba(231,76,60,0.08);
    animation: hbia-shake 0.2s linear 2;
}

@keyframes hbia-shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-4px); }
    50% { transform: translateX(4px); }
    75% { transform: translateX(-2px); }
}

.hbia-quiz-actions {
    display: flex;
    gap: 12px;
    margin: 12px 0;
    flex-wrap: wrap;
}

.hbia-btn {
    padding: 10px 16px;
    border-radius: 8px;
    border: 1px solid var(--hbia-border);
    background: var(--hbia-card);
    color: var(--hbia-text);
    cursor: pointer;
    transition: background 0.2s ease, transform 0.2s ease;
}

.hbia-btn-primary {
    background: var(--hbia-primary);
    color: #fff;
    border-color: var(--hbia-primary);
}

.hbia-btn:hover {
    transform: translateY(-1px);
}

.hbia-quiz-score {
    font-size: 1.1em;
    font-weight: 700;
    color: var(--hbia-primary);
}

.hbia-warning {
    color: var(--hbia-error);
}

.hbia-categories-grid {
    display: grid;
    gap: 16px;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.hbia-category-card {
    background: var(--hbia-card);
    border: 1px solid var(--hbia-border);
    border-radius: 10px;
    padding: 16px;
    box-shadow: 0 6px 16px rgba(0,0,0,0.05);
}

.hbia-category-card h3 {
    margin-top: 0;
    color: var(--hbia-primary);
}

.hbia-category-card ul {
    padding-left: 18px;
    margin: 8px 0;
}

.hbia-link {
    color: var(--hbia-primary);
    text-decoration: none;
}

.hbia-link:hover {
    text-decoration: underline;
}