:root{--ink: #23201a;--muted: #6d675d;--paper: #f7f3ea;--panel: #fffdf8;--line: #d8d0c1;--silt: #948f7f;--seal: #b8442f;--water: #2c6f7e;--series-all: #23201a;--series-nsbd: #b8442f;--series-hebei: #2c6f7e;--plum: #73517a;--sidebar-width: 320px;--shadow: 0 18px 44px rgba(54, 45, 31, .16);font-family:Songti SC,"Noto Serif CJK SC","Source Han Serif SC",serif;color:var(--ink);background:var(--paper)}*{box-sizing:border-box}body{margin:0;min-width:320px}button,input{font:inherit}button{cursor:pointer}.shell{min-height:100vh;display:block}.sidebar-tab{position:fixed;top:24px;left:calc(var(--sidebar-width) - 1px);z-index:30;width:54px;min-height:132px;border:1px solid var(--line);border-left:0;border-radius:0 8px 8px 0;padding:18px 10px;color:var(--panel);background:var(--plum);box-shadow:8px 12px 24px #362d1f24;transition:left .18s ease,background .18s ease,color .18s ease}.sidebar-tab:before{content:"";position:absolute;top:0;right:0;border-top:16px solid var(--panel);border-left:16px solid rgba(0,0,0,.2);border-radius:0 7px 0 0}.sidebar-tab span{display:block;writing-mode:vertical-rl;letter-spacing:.12em}.sidebar{position:fixed;top:0;left:0;z-index:20;width:var(--sidebar-width);height:100vh;padding:28px;display:flex;flex-direction:column;gap:24px;border-right:1px solid var(--line);background:linear-gradient(90deg,rgba(184,68,47,.11) 0 1px,transparent 1px 100%),linear-gradient(var(--panel),var(--paper));background-size:22px 100%,auto;box-shadow:var(--shadow);transition:transform .18s ease}.is-sidebar-collapsed .sidebar{transform:translate(-100%)}.is-sidebar-collapsed .sidebar-tab{left:0;background:var(--panel);color:var(--plum)}.brand{padding-bottom:18px;border-bottom:2px solid var(--ink)}.section-heading p,.search-field span{margin:0;font-family:PingFang SC,Noto Sans CJK SC,system-ui,sans-serif;letter-spacing:0;font-size:12px}h1,h2{margin:0;line-height:1;font-weight:700}h1{max-width:4ch;font-family:Kaiti SC,STKaiti,KaiTi,Songti SC,serif;font-size:68px;font-weight:500;letter-spacing:0;writing-mode:vertical-rl}.search-field{display:grid;gap:8px;color:var(--muted)}.search-field input{width:100%;min-height:46px;border:1px solid var(--line);border-radius:6px;padding:0 14px;color:var(--ink);background:var(--panel);outline:none}.search-field input:focus,.filter:focus-visible,.book-card:focus-visible,.series-chip:focus-visible,.series-option:focus-visible,.sidebar-tab:focus-visible{outline:3px solid rgba(44,111,126,.28);outline-offset:2px}.filters{display:grid;grid-template-columns:1fr;gap:8px}.filter{min-height:40px;border:1px solid var(--line);border-radius:6px;color:var(--ink);background:#fffdf8b8}.filter[data-series=nsbd]{border-color:#b8442f5c;color:var(--series-nsbd)}.filter[data-series=hebei]{border-color:#2c6f7e61;color:var(--series-hebei)}.filter[data-series=all].is-active{border-color:var(--series-all);background:var(--series-all);color:var(--panel)}.filter[data-series=nsbd].is-active{border-color:var(--series-nsbd);background:var(--series-nsbd);color:var(--panel)}.filter[data-series=hebei].is-active{border-color:var(--series-hebei);background:var(--series-hebei);color:var(--panel)}.workspace{padding:20px;margin-left:calc(var(--sidebar-width) + 54px);min-height:100vh;transition:margin-left .18s ease}.is-sidebar-collapsed .workspace{margin-left:54px}.catalogue{min-width:0;display:flex;flex-direction:column;gap:12px}.section-heading{position:sticky;top:0;z-index:12;min-height:62px;display:flex;align-items:end;justify-content:space-between;gap:12px;border-bottom:1px solid var(--line);padding-bottom:10px;background:var(--paper);color:var(--muted)}.section-note{position:relative;display:inline-block;z-index:0;margin-top:2px;color:var(--muted)!important;font-size:16px;line-height:1.4}.section-note:after{content:"";position:absolute;left:0;right:0;bottom:.08em;z-index:-1;height:.36em;border-radius:999px;background:#b8442f2e}.series-picker{position:relative;flex:0 0 auto}.series-chip{min-height:34px;border:1px solid var(--series-all);border-radius:999px;padding:0 15px;color:var(--series-all);background:#fffdf8b8;font-size:16px;line-height:1}.series-chip[data-series=nsbd]{border-color:var(--series-nsbd);color:var(--series-nsbd)}.series-chip[data-series=hebei]{border-color:var(--series-hebei);color:var(--series-hebei)}.series-chip:hover{background:var(--panel)}.series-menu{position:absolute;top:calc(100% + 8px);right:0;z-index:10;min-width:132px;display:grid;gap:4px;border:1px solid var(--line);border-radius:8px;padding:6px;background:var(--panel);box-shadow:var(--shadow)}.series-option{min-height:34px;border:1px solid transparent;border-radius:6px;padding:0 12px;color:var(--ink);background:transparent;text-align:left}.series-option[data-series=nsbd]{color:var(--series-nsbd)}.series-option[data-series=hebei]{color:var(--series-hebei)}.series-option.is-active{border-color:var(--ink);color:var(--panel);background:var(--ink)}.series-option[data-series=nsbd].is-active{border-color:var(--series-nsbd);background:var(--series-nsbd)}.series-option[data-series=hebei].is-active{border-color:var(--series-hebei);background:var(--series-hebei)}.book-list{display:grid;gap:10px;overflow:visible}.book-row{--row-color: var(--water);display:grid;grid-template-columns:minmax(280px,410px) 34px minmax(420px,1fr);align-items:stretch;min-width:0}.book-row[data-series=nsbd]{--row-color: var(--series-nsbd)}.book-row[data-series=hebei]{--row-color: var(--series-hebei)}.book-node{position:relative;display:none}.book-row.is-expanded .book-node{display:block}.book-row.is-expanded .book-node:before{content:"";position:absolute;top:50%;left:0;right:-1px;height:2px;background:var(--row-color);transform:translateY(-50%)}.book-row.is-expanded .book-node:after{content:"";position:absolute;top:50%;right:-6px;width:10px;height:10px;border:2px solid var(--row-color);border-radius:50%;background:var(--paper);transform:translateY(-50%)}.book-card{width:100%;min-height:118px;display:grid;grid-template-rows:1fr auto;gap:12px;border:1px solid var(--line);border-left:5px solid var(--silt);border-radius:8px;padding:14px;text-align:left;color:var(--ink);background:var(--panel)}.book-card:hover,.book-card.is-selected{border-color:var(--row-color);border-left-color:var(--row-color);box-shadow:0 10px 24px #2c6f7e1f}.book-card strong{line-height:1.25;font-size:17px}.book-meta{font-size:13px;line-height:1.35;color:var(--muted);overflow-wrap:anywhere}.book-actions{display:grid;grid-template-columns:minmax(0,1fr) 1px minmax(0,1fr) minmax(0,1fr);align-items:stretch;min-height:118px;border:1px solid var(--line);border-radius:8px;overflow:hidden;color:var(--ink);background:linear-gradient(90deg,rgba(35,32,26,.05) 1px,transparent 1px),linear-gradient(rgba(35,32,26,.05) 1px,transparent 1px),var(--panel);background-size:24px 24px;box-shadow:var(--shadow)}.action-link{display:inline-flex;align-items:center;justify-content:center;min-width:0;padding:0 18px;color:var(--ink);text-align:center;text-decoration:none}.action-link:hover,.action-link:focus-visible{color:var(--panel);background:var(--row-color)}.action-link:focus-visible{outline:3px solid rgba(44,111,126,.28);outline-offset:-3px}.action-link.is-disabled{pointer-events:none;color:var(--muted);opacity:.48}.action-divider{align-self:stretch;background:var(--line)}.empty-state{margin:18px 0;color:var(--muted)}[hidden]{display:none!important}@media(max-width:980px){.sidebar{width:min(var(--sidebar-width),calc(100vw - 54px))}.sidebar-tab{left:calc(min(var(--sidebar-width),calc(100vw - 54px)) - 1px)}.is-sidebar-collapsed .sidebar-tab{left:0}.workspace{min-height:100vh;margin-left:54px}.book-row{grid-template-columns:1fr;gap:8px}.book-row.is-expanded .book-node{display:none}.book-actions{grid-template-columns:1fr 1px 1fr 1fr;min-height:86px}}@media(max-width:640px){.sidebar,.workspace{padding:16px}.book-actions{grid-template-columns:1fr}.action-divider{height:1px}}