.cats-header { margin-bottom: 48px; }
.cats-header h1 {
    font-family: var(--font-display);
    font-size: 38px; font-weight: 800;
    color: var(--ink); margin-bottom: 8px;
}
.cats-header p { font-size: 16px; color: var(--ink-3); }

.parent-cat { margin-bottom: 8px; }

.parent-cat-header {
    display: flex; align-items: center; gap: 14px;
    padding: 18px 20px;
    background: var(--surface);
    border: 1.5px solid var(--border);
    border-radius: 12px;
    cursor: pointer;
    transition: all .2s;
    user-select: none;
}
.parent-cat-header:hover { border-color: var(--accent); box-shadow: var(--shadow); }
.parent-cat.open .parent-cat-header { border-color: var(--accent); border-radius: 12px 12px 0 0; border-bottom-color: var(--accent-light); }

.parent-cat-icon {
    width: 44px; height: 44px;
    background: var(--accent-light);
    border-radius: 10px;
    display: flex; align-items: center; justify-content: center;
    font-size: 20px; flex-shrink: 0;
    transition: background .2s;
}
.parent-cat.open .parent-cat-icon { background: var(--accent); }

.parent-cat-name {
    font-family: var(--font-display);
    font-size: 18px; font-weight: 700; color: var(--ink);
}
.parent-cat-desc { font-size: 13px; color: var(--ink-3); margin-top: 2px; }

.parent-cat-chevron {
    margin-left: auto; flex-shrink: 0;
    width: 20px; height: 20px;
    stroke: var(--ink-3);
    transition: transform .25s ease;
}
.parent-cat.open .parent-cat-chevron { transform: rotate(180deg); stroke: var(--accent); }

/* Collapsible body */
.parent-cat-body {
    display: none;
    background: var(--surface);
    border: 1.5px solid var(--accent);
    border-top: none;
    border-radius: 0 0 12px 12px;
    overflow: hidden;
}
.parent-cat.open .parent-cat-body { display: block; }

/* Subcat */
.subcat-block { padding: 8px 16px 8px 28px; border-left: 2px solid var(--border); margin: 8px 16px 8px 20px; }

.subcat-row { margin-bottom: 4px; }

.subcat-header {
    display: flex; align-items: center; gap: 10px;
    padding: 10px 14px;
    background: var(--surface-2);
    border: 1px solid var(--border);
    border-radius: 8px;
    cursor: pointer;
    transition: all .15s;
    user-select: none;
    margin-bottom: 2px;
}
.subcat-header:hover { border-color: var(--accent); background: var(--accent-light); }
.subcat-row.open .subcat-header { border-color: var(--accent); background: var(--accent-light); border-radius: 8px 8px 0 0; }

.subcat-dot {
    width: 8px; height: 8px;
    background: var(--border); border-radius: 50%; flex-shrink: 0;
    transition: background .15s;
}
.subcat-row.open .subcat-dot,
.subcat-header:hover .subcat-dot { background: var(--accent); }

.subcat-name { font-size: 14px; font-weight: 600; color: var(--ink); }
.subcat-count { margin-left: auto; font-size: 12px; color: var(--ink-3); font-weight: 500; white-space: nowrap; }

.subcat-chevron {
    width: 14px; height: 14px;
    stroke: var(--ink-3); flex-shrink: 0;
    transition: transform .2s ease;
}
.subcat-row.open .subcat-chevron { transform: rotate(180deg); stroke: var(--accent); }

.subcat-articles {
    display: none;
    border: 1px solid var(--accent);
    border-top: none;
    border-radius: 0 0 8px 8px;
    background: var(--surface);
    padding: 4px 0;
}
.subcat-row.open .subcat-articles { display: block; }

/* Articles */
.article-row {
    display: flex; align-items: center; gap: 10px;
    padding: 9px 16px;
    text-decoration: none;
    transition: background .12s;
    border-bottom: 1px solid var(--surface-3);
}
.article-row:last-child { border-bottom: none; }
.article-row:hover { background: var(--surface-2); }

.article-row-dot {
    width: 6px; height: 6px;
    background: var(--border); border-radius: 50%; flex-shrink: 0;
}
.article-row:hover .article-row-dot { background: var(--accent); }
.article-row-title { font-size: 13px; font-weight: 500; color: var(--ink-2); line-height: 1.4; }
.article-row:hover .article-row-title { color: var(--accent); }
.article-row-count { margin-left: auto; font-size: 11px; color: var(--ink-3); white-space: nowrap; }

/* Direct articles inside parent */
.direct-articles-block {
    padding: 4px 16px 12px;
}
.direct-articles-block .article-row {
    border-radius: 6px;
    border-bottom: none;
    padding: 8px 12px;
}

.cat-card-icon {
    width: 44px;
    height: 44px;
    background: var(--accent-light);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 4px;
    transition: background .2s;
}
.cat-card-icon svg {
    width: 20px;
    height: 20px;
    stroke: var(--accent);
    transition: stroke .2s;
}