/* 方程库全目录页（/equations）
 *
 * 这一页的首要用途是给爬虫一条从一级入口直达全库的路，其次才是给人看，
 * 所以正文是纯链接列表、没有交互。样式只求扫得动：章节分明、行距够、
 * 长名字不撑破布局。
 */

.eq-index {
    max-width: 1100px;
    margin: 0 auto;
    padding: 24px 16px 48px;
}

.eq-index h1 {
    font-size: 1.7rem;
    margin: 0 0 8px;
}

.eq-index-lead {
    color: #555;
    line-height: 1.7;
    margin: 0 0 20px;
}

/* 章节速跳 */
.eq-index-toc {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 28px;
}

.eq-index-toc a {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    border: 1px solid #d8dee9;
    border-radius: 999px;
    color: #2b6cb0;
    text-decoration: none;
    font-size: 0.9rem;
    background: #f8fafc;
}

.eq-index-toc a:hover {
    border-color: #2b6cb0;
    background: #eef4fb;
}

.toc-count {
    color: #8a94a6;
    font-size: 0.82rem;
}

.eq-index-part {
    margin-bottom: 36px;
}

.eq-index-part h2 {
    font-size: 1.25rem;
    border-left: 4px solid #2b6cb0;
    padding-left: 10px;
    margin: 0 0 14px;
    display: flex;
    align-items: baseline;
    gap: 10px;
}

.part-count {
    font-size: 0.85rem;
    font-weight: 400;
    color: #8a94a6;
}

.eq-index-part h3 {
    font-size: 1rem;
    color: #444;
    margin: 18px 0 8px;
}

.eq-index-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 2px 20px;
}

.eq-index-list li {
    line-height: 1.9;
    /* 中文长名不撑破网格列 */
    min-width: 0;
    overflow-wrap: anywhere;
}

.eq-index-list a {
    color: #1a365d;
    text-decoration: none;
}

.eq-index-list a:hover {
    color: #2b6cb0;
    text-decoration: underline;
}

@media (max-width: 700px) {
    .eq-index {
        padding: 16px 12px 32px;
    }

    .eq-index-list {
        grid-template-columns: 1fr;
    }
}