/* 语法学习：类型列表 + 详情页 */

#page-grammar .page-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
}

.grammar-page-subtitle {
    width: 100%;
    margin: 0;
    padding: 0;
}

.grammar-type-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}

.grammar-type-card {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
    padding: 20px 22px;
    text-align: left;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    background: var(--bg-card);
    box-shadow: var(--shadow-sm);
    cursor: pointer;
    font-family: inherit;
    transition:
        border-color var(--transition-fast),
        box-shadow var(--transition-fast),
        transform var(--transition-fast);
}

.grammar-type-card:hover {
    border-color: var(--primary-light);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.grammar-type-card:focus-visible {
    outline: 3px solid var(--primary-light);
    outline-offset: 2px;
}

.grammar-type-card-icon {
    font-size: 2rem;
    line-height: 1;
}

.grammar-type-card-title {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-primary);
}

.grammar-type-card-desc {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.45;
}

/* 详情页 */
.grammar-detail-header {
    margin-bottom: 20px;
}

.grammar-back-btn {
    margin-bottom: 12px;
}

.grammar-detail-title {
    font-size: 1.45rem;
    margin-bottom: 6px;
    color: var(--text-primary);
}

.grammar-detail-desc {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: 0;
}

.grammar-detail-body {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 20px 22px;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    min-height: 120px;
}

.grammar-detail-body .grammar-placeholder {
    color: var(--text-secondary);
    margin: 0;
    padding: 12px 0;
}

@media (max-width: 600px) {
    .grammar-type-grid {
        grid-template-columns: 1fr;
    }
}