/* Content-sized category rows. Branches span the panel; leaf links wrap naturally. */
.category-groups { display: flex; flex-wrap: wrap; align-items: flex-start; gap: 10px; }
.category-group { min-width: 0; max-width: 100%; box-sizing: border-box; }
.category-group.is-leaf { flex: 0 1 auto; border: 1px solid var(--border-color); border-radius: 8px; background: var(--front-dark-bg-color); }
.category-group-title { display: flex; align-items: center; justify-content: space-between; gap: 16px; color: var(--title-color); font-size: 14px; font-weight: 600; line-height: 1.6; }
.category-group.is-leaf .category-group-title { padding: 10px 14px; }
.category-group.has-children { flex: 0 0 100%; display: grid; grid-template-columns: 112px minmax(0, 1fr); gap: 20px; padding: 16px; border: 1px solid var(--border-color); border-radius: 10px; background: var(--front-dark-bg-color); }
.category-group.has-children > .category-group-title { align-self: start; padding-top: 5px; }
.category-group-title span:first-child { overflow-wrap: anywhere; }
.category-link-arrow { flex-shrink: 0; color: var(--light-text-color); font-size: 12px; font-weight: 400; }
.category-group.has-children > .category-group-title .category-link-arrow { display: none; }
.category-group-title:hover, .category-tree a:hover { color: var(--primary-color); }
.category-tree { display: flex; flex-wrap: wrap; align-items: flex-start; gap: 6px 8px; margin: 0; padding: 0 0 0 16px; border-left: 1px solid var(--border-color); list-style: none; min-width: 0; }
.category-tree li { margin: 0; padding: 0; min-width: 0; max-width: 100%; line-height: 1.6; }
.category-tree a { display: block; padding: 5px 8px; border-radius: 5px; color: var(--text-color); font-size: 13px; overflow-wrap: anywhere; }
.category-tree a:hover { background: var(--front-bg-color); }
.category-tree .category-branch { flex-basis: 100%; }
.category-branch > a { font-weight: 500; color: var(--title-color); }
.category-tree .category-tree { margin: 5px 0 5px 8px; }
.category-groups a:focus-visible, .category-nav-toggle:focus-visible, .category-browse:focus-visible { outline: 2px solid var(--primary-color); outline-offset: 3px; border-radius: 4px; }
/* Navigation: bounded, scrollable mega panel; mobile uses the same groups inline. */
#menu { overflow: visible; }
.menu-item.category-nav { position: relative; padding-right: 20px; }
.category-nav-toggle { position: absolute; right: 0; top: 50%; transform: translateY(-50%); width: 26px; height: 32px; padding: 0; display: grid; place-items: center; border: 0; border-radius: 6px; background: transparent; color: var(--light-text-color); cursor: pointer; }
.category-nav-toggle:hover { background: var(--front-dark-bg-color); color: var(--primary-color); }
.category-nav-toggle svg { transition: transform .18s ease; }
.category-nav-toggle[aria-expanded="true"] svg { transform: rotate(180deg); }
.category-panel { position: absolute; top: 100%; left: var(--category-offset, 0px); width: min(560px, calc(100vw - 32px)); max-height: min(640px, calc(100dvh - 90px)); overflow: auto; overscroll-behavior: contain; padding: 20px; box-sizing: border-box; border: 1px solid var(--border-color); border-radius: 14px; background: var(--front-bg-color); box-shadow: 0 16px 44px rgba(20, 30, 60, .14); white-space: normal; line-height: 1.5; z-index: 20; text-align: left; }
.category-panel[hidden] { display: none; }
.category-panel-head { display: flex; justify-content: space-between; align-items: center; gap: 16px; padding: 0 2px 14px; margin-bottom: 14px; border-bottom: 1px solid var(--border-color); color: var(--title-color); font-size: 15px; font-weight: 600; }
.menu-item .category-panel-head a { padding: 0; font-size: 12px; font-weight: 400; color: var(--light-text-color); }
.menu-item .category-group-title { font-size: 14px; }
.menu-item .category-tree a { padding: 5px 8px; font-size: 13px; }
.menu-item .category-tree li { display: block; text-align: left; }
/* Directory cards */
.category-directory { padding-top: 24px; }
.category-intro { margin-bottom: 24px; }
.category-card { margin-bottom: 24px; overflow: hidden; }
.category-card-head { display: flex; align-items: center; gap: 20px; padding: 28px; }
.category-cover { width: 64px; height: 64px; flex: 0 0 64px; display: grid; place-items: center; border-radius: 14px; background: var(--front-dark-bg-color); overflow: hidden; color: var(--primary-color); }
.category-cover img { width: 100%; height: 100%; object-fit: contain; padding: 8px; box-sizing: border-box; }
.category-cover svg { width: 30px; height: 30px; }
.category-heading { flex: 1; min-width: 0; }
.category-heading h2 { font-size: 21px; line-height: 1.4; margin: 0; font-weight: 600; }
.category-heading h2 a { color: var(--title-color); }
.category-heading p { margin: 8px 0 0; color: var(--light-text-color); font-size: 13px; line-height: 1.8; overflow-wrap: anywhere; }
.category-meta { display: inline-block; margin-top: 10px; font-size: 12px; color: var(--light-text-color); }
.category-browse { display: flex; align-items: center; gap: 8px; flex-shrink: 0; padding: 8px 12px; border: 1px solid var(--border-color); border-radius: 8px; color: var(--light-text-color); font-size: 12px; transition: background .18s, color .18s; }
.category-browse:hover { color: var(--primary-color); background: var(--front-dark-bg-color); }
.category-card-body { padding: 0 28px 28px; }
.category-card-body .category-groups { padding-top: 20px; border-top: 1px solid var(--border-color); gap: 10px; }
@media (max-width: 960px) {
    #menu { overflow-x: hidden; overflow-y: auto; width: min(360px, 88vw); }
    .menu-item.category-nav { padding-right: 0; text-align: left; }
    .menu-item.category-nav > a { display: block; padding-left: 24px; padding-right: 52px; }
    .category-nav-toggle { right: 16px; top: 7px; transform: none; }
    .category-panel { position: static; width: auto; max-height: none; margin: 0 12px 12px; padding: 14px; box-shadow: none; border-radius: 10px; }
    .category-panel .category-groups { gap: 8px; }
    .category-panel .category-group.has-children { grid-template-columns: 1fr; gap: 10px; padding: 12px; }
    .category-panel-head { font-size: 13px; }
}
@media (max-width: 600px) {
    .category-directory { padding-top: 16px; }
    .category-card-head { display: grid; grid-template-columns: 48px minmax(0, 1fr); padding: 20px; gap: 14px; align-items: start; }
    .category-cover { width: 48px; height: 48px; flex-basis: 48px; border-radius: 10px; }
    .category-heading h2 { font-size: 18px; }
    .category-browse { grid-column: 2; justify-self: start; }
    .category-card-body { padding: 0 20px 20px; }
    .category-group.has-children { grid-template-columns: 1fr; gap: 10px; }
    .category-card { margin-bottom: 16px; }
}
@media (prefers-reduced-motion: reduce) {
    .category-nav-toggle svg, .category-browse { transition: none; }
}
.menu-item .category-panel a { white-space: normal; }
.menu-item .category-panel a:hover { color: var(--primary-color); }