/* 顶部保留品牌与分类开关，侧栏收起后不留下窄轨。 */
:root{--site-header-height:76px}
/* 页面使用完整屏幕宽度，开关和分类列表保留相同的内边距。 */
.site-header{position:sticky;top:0;z-index:30;display:flex;align-items:center;justify-content:space-between;gap:20px;min-height:var(--site-header-height);padding:12px 22px;border-bottom:1px solid var(--line);background:var(--paper)}
.site-header-actions{display:flex;align-items:center;gap:12px}
.brand{display:flex;align-items:center;min-width:0;color:var(--ink)}
.brand-name{font-family:"Songti SC","STSong",Georgia,serif;font-size:26px;line-height:1.1;letter-spacing:3px;white-space:nowrap}
.brand-name small{display:block;margin-top:7px;color:var(--muted);font-size:10px;letter-spacing:1px}
.sidebar-toggle{position:static;display:inline-flex;align-items:center;justify-content:center;flex-shrink:0;gap:9px;min-height:44px;padding:10px 14px;border:1px solid var(--line);border-radius:6px;background:var(--surface);color:var(--accent);font-size:13px}
.sidebar-toggle:hover{border-color:var(--accent);background:var(--accent-soft)}
.sidebar-toggle svg{width:18px;height:18px;transition:transform .24s ease}
.sidebar-toggle-label{white-space:nowrap}
.sidebar-toggle[aria-expanded=false] svg{transform:rotate(180deg)}

.catalog-layout{display:grid;grid-template-columns:216px minmax(0,1fr);width:100%;min-height:calc(100dvh - var(--site-header-height));transition:grid-template-columns .24s ease}
.catalog-sidebar{position:sticky;top:var(--site-header-height);display:flex;flex-direction:column;min-width:0;height:calc(100dvh - var(--site-header-height));padding:32px 22px 24px;overflow:hidden;border-right:1px solid var(--line);background:#f0ece5;opacity:1;visibility:visible;transition:padding .24s ease,border-width .24s ease,opacity .18s ease,visibility 0s}
.sidebar-inner{display:flex;flex:1;flex-direction:column;min-width:0;min-height:0;overflow:hidden}
.sidebar-content{display:flex;flex:1;flex-direction:column;min-height:0}
.sidebar-section{min-height:0;overflow:auto;scrollbar-width:thin}
.sidebar-label{margin:0 12px 16px;color:var(--muted);font-size:12px;letter-spacing:1.5px}
.category-nav{display:flex;flex-direction:column;gap:6px;padding:4px;margin:-4px}
.category-button{display:flex;align-items:center;justify-content:space-between;gap:10px;width:100%;min-height:48px;padding:12px;border:0;border-radius:6px;background:transparent;text-align:left;font-size:14px;transition:background .15s}
.category-button:hover{background:var(--accent-soft)}
.category-button.is-active{background:var(--accent);color:var(--surface)}
.category-number{min-width:24px;padding:2px 6px;border-radius:4px;background:#e9e5dd;color:var(--muted);font-size:12px;text-align:center;font-variant-numeric:tabular-nums}
.is-active .category-number{background:#ffffff20;color:var(--surface)}
.sidebar-footer{margin-top:auto;padding:28px 12px 0;color:var(--muted);font-size:12px;line-height:1.8}
.sidebar-footer p{max-width:170px;margin:0}
.catalog-layout.is-sidebar-collapsed{grid-template-columns:0 minmax(0,1fr)}
.is-sidebar-collapsed .catalog-sidebar{padding-right:0;padding-left:0;border-right-width:0;opacity:0;visibility:hidden;pointer-events:none;transition:padding .24s ease,border-width .24s ease,opacity .18s ease,visibility 0s .24s}
/* 动画中保持分类文字宽度，由外层裁切，避免文字被挤成竖排。 */
@media(min-width:1001px){.sidebar-inner{min-width:171px}}

@media(max-width:1000px){
  .site-header{padding-right:28px;padding-left:28px}
  .catalog-layout{display:flex;flex-direction:column}
  .catalog-sidebar{position:relative;top:auto;display:grid;grid-template-rows:1fr;flex-shrink:0;height:auto;padding:0;border-right:0;border-bottom:1px solid var(--line);transition:grid-template-rows .24s ease,border-width .24s ease,opacity .18s ease,visibility 0s}
  .sidebar-content{display:block;margin:18px 28px}
  .sidebar-label,.sidebar-footer{display:none}
  .sidebar-section{overflow:visible}
  .category-nav{flex-direction:row;gap:8px;overflow:auto;scrollbar-width:none}
  .category-nav::-webkit-scrollbar{display:none}
  .category-button{flex:0 0 auto;width:auto;min-height:44px;padding:10px 13px;white-space:nowrap;font-size:13px}
  .category-number{font-size:11px}
  .is-sidebar-collapsed .catalog-sidebar{grid-template-rows:0fr;border-bottom-width:0;transition:grid-template-rows .24s ease,border-width .24s ease,opacity .18s ease,visibility 0s .24s}
}
@media(max-width:700px){
  :root{--site-header-height:64px}
  .site-header{gap:12px;padding:9px 18px}
  .site-header-actions{gap:8px}
  .brand-name{font-size:22px;letter-spacing:2px}
  .brand-name small{display:none}
  .sidebar-content{margin:14px 18px}
}
@media(max-width:370px){
  .site-header{gap:8px;padding-right:12px;padding-left:12px}
  .sidebar-content{margin-right:12px;margin-left:12px}
  .sidebar-toggle{gap:6px;padding-right:8px;padding-left:8px;font-size:12px}
  .brand-name{font-size:18px;letter-spacing:1px}
}
@media(prefers-reduced-motion:reduce){
  .catalog-layout,.catalog-sidebar,.sidebar-toggle svg{transition:none!important}
}