:root {
    --block-bg-light: #f7f7f7;
    --block-bg-dark: #ffffff;
    --block-border: rgba(0, 0, 0, 0.05);
    --accent-12: #31c27c;
    --accent-93: #ff9d3d;
    --accent-200: #ff5560;
    --accent-api: #6c63ff;
    --accent-local: #00c9ff;
    --accent-stats: #4c5bff;
}

.quiz-blocks {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1.5rem;
    margin: 3rem 0 2rem;
}

.quiz-block {
    background: var(--block-bg-light);
    border-radius: 18px;
    padding: 1.8rem 1.6rem;
    box-shadow: 0 20px 45px rgba(0, 0, 0, 0.08);
    transition: transform 0.25s ease, box-shadow 0.25s ease;
    border: 1px solid var(--block-border);
    position: relative;
    overflow: hidden;
}

.quiz-block::after {
    content: "";
    position: absolute;
    inset: 0;
    opacity: 0;
    background: linear-gradient(135deg, rgba(255,255,255,0) 20%, rgba(255,255,255,0.35));
    transition: opacity 0.3s ease;
}

.quiz-block:hover {
    transform: translateY(-6px);
    box-shadow: 0 25px 55px rgba(0, 0, 0, 0.12);
}

.quiz-block:hover::after {
    opacity: 1;
}

.quiz-block h3 {
    font-size: 1.85rem;
    font-weight: 700;
    margin-bottom: 0.65rem;
}

.quiz-block p {
    margin-bottom: 0.9rem;
    color: #555;
    min-height: 48px;
}

.quiz-pill {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.4rem 0.9rem;
    border-radius: 999px;
    font-size: 0.85rem;
    font-weight: 600;
    color: #fff;
}

.quiz-cta {
    margin-top: 1rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-weight: 600;
    color: #333;
}

.quiz-cta span {
    display: inline-flex;
    align-items: center;
}

.quiz-cta svg {
    width: 20px;
    height: 20px;
    margin-left: 0.35rem;
    transition: transform 0.2s ease;
}

.quiz-block:hover .quiz-cta svg {
    transform: translateX(3px);
}

.quiz-block[data-size="12"] {
    border-top: 5px solid var(--accent-12);
}

.quiz-block[data-size="93"] {
    border-top: 5px solid var(--accent-93);
}

.quiz-block[data-size="200"] {
    border-top: 5px solid var(--accent-200);
}

.quiz-block[data-type="local"] {
    border-top: 5px solid var(--accent-local);
}

.quiz-block[data-type="api"] {
    border-top: 5px solid var(--accent-api);
}

.stats-grid {
    margin-top: 1rem;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 1rem;
}

.stats-card {
    background: var(--block-bg-dark);
    border-radius: 14px;
    padding: 1.3rem 1.5rem;
    border: 1px solid var(--block-border);
    box-shadow: 0 15px 32px rgba(0, 0, 0, 0.08);
}

.stats-card h4 {
    margin: 0;
    color: #222;
    font-size: 0.95rem;
    font-weight: 600;
}

.stats-card strong {
    display: block;
    margin-top: 0.5rem;
    font-size: 1.9rem;
}

.stats-card small {
    color: #666;
}

.source-toggle {
    margin-top: 2rem;
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.source-btn {
    border: 1px solid var(--block-border);
    border-radius: 999px;
    padding: 0.5rem 1.4rem;
    background: rgba(255, 255, 255, 0.85);
    color: #222;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

.source-btn.active[data-source="local"] {
    color: #fff;
    background: var(--accent-local);
    border-color: var(--accent-local);
}

.source-btn.active[data-source="api"] {
    color: #fff;
    background: var(--accent-api);
    border-color: var(--accent-api);
}

@media (max-width: 768px) {
    .quiz-block h3 {
        font-size: 1.5rem;
    }

    .stats-card strong {
        font-size: 1.6rem;
    }
}