/* A local, opt-in navigation layer; archive components keep the existing theme. */
:root{--tree-filed-bg:#2b381a;--tree-filed-line:#aac96d;--tree-filed-text:#edf6da;--tree-empty-bg:#1b1e1a;--tree-empty-line:#51564d;--tree-empty-text:#a0a59b}
:root[data-theme="light"]{--tree-filed-bg:#e9f1d4;--tree-filed-line:#607f2a;--tree-filed-text:#25350f;--tree-empty-bg:#f0f1ee;--tree-empty-line:#b8beb2;--tree-empty-text:#6a7064}
@media(prefers-color-scheme:light){:root:not([data-theme="dark"]){--tree-filed-bg:#e9f1d4;--tree-filed-line:#607f2a;--tree-filed-text:#25350f;--tree-empty-bg:#f0f1ee;--tree-empty-line:#b8beb2;--tree-empty-text:#6a7064}}
.nav-ready .layout{display:block;max-width:1300px}
.nav-ready .sidebar,.nav-ready .picker-fab{display:none!important}
.nav-ready .layout main{padding-top:10px;max-width:1220px}
.nav-ready .breadcrumb{display:none}
.tree-mode .topbar{transform:none!important}
.tree-home{max-width:1450px;padding:36px 24px 40px;overflow-anchor:none}
.tree-intro{display:flex;justify-content:space-between;align-items:center;gap:20px;margin-bottom:24px}
.tree-intro h1{font-size:30px;letter-spacing:-.7px;font-weight:650;margin:6px 0}
.tree-intro p{color:var(--muted);font-size:14px}
.tree-preview-label{font-size:12px;color:var(--muted);border:1px solid var(--border);border-radius:999px;padding:5px 12px;white-space:nowrap}
.tree-controls{position:sticky;top:var(--topbar-h);z-index:9;background:var(--bg);border:1px solid var(--border);border-radius:12px;box-shadow:var(--shadow)}
.tree-countries{display:flex;gap:4px;padding:8px;overflow-x:auto;border-bottom:1px solid var(--border);scrollbar-width:thin}
.tree-countries button{display:flex;align-items:center;justify-content:center;gap:7px;flex:1;white-space:nowrap;padding:8px 9px;border-color:transparent;background:transparent;min-height:42px}
.tree-countries button:disabled{opacity:.48}
.tree-countries button[aria-pressed=true]{background:var(--accent-soft);border-color:var(--accent-line);color:var(--accent);font-weight:650}
.tree-countries img,.tree-overview img{border-radius:2px;object-fit:contain}
.tree-tools{display:flex;gap:20px;justify-content:space-between;align-items:center;padding:12px 14px}
.tree-search-wrap{position:relative;width:440px;max-width:100%}
.tree-search-wrap input{font-size:14px}
.tree-search-wrap .search-box{height:44px}
.tree-modes{display:flex;gap:3px;background:var(--sunken);border:1px solid var(--border);padding:3px;border-radius:9px;flex-shrink:0}
.tree-modes button{min-height:36px;padding:4px 14px;font-size:13px;border:0;background:transparent;color:var(--muted)}
.tree-modes button[aria-pressed=true]{background:var(--accent);color:var(--accent-ink);box-shadow:var(--shadow);font-weight:650}
.tree-rank-nav{display:flex;align-items:center;gap:6px;padding:0 14px 10px;font-size:12px;color:var(--muted)}
.tree-rank-nav>span:first-child{margin-right:6px}
.tree-rank-nav button{border:0;background:var(--sunken);min-width:32px;min-height:32px;padding:2px 5px;font-family:var(--mono);font-size:12px}
.tree-rank-nav button:hover{background:var(--accent-soft);color:var(--accent)}
.tree-swipe-hint{margin-left:auto;font-size:11px}
.tree-results{position:absolute;z-index:15;top:calc(100% + 6px);left:0;right:0;background:var(--surface);border:1px solid var(--border-strong);border-radius:10px;box-shadow:var(--shadow);max-height:360px;overflow-y:auto;padding:7px}
.tree-results p{padding:5px 8px;color:var(--muted);font-size:12px}
.tree-results button{display:block;text-align:left;width:100%;padding:9px 10px;border:0;background:transparent}
.tree-results button:hover,.tree-results button:focus-visible{background:var(--accent-soft)}
.tree-results button strong{display:block;font-size:14px}
.tree-results button span{display:block;color:var(--muted);font-size:12px}
.tree-overview{display:flex;justify-content:space-between;align-items:end;gap:12px;margin:28px 0 15px}
.tree-overview h2{display:flex;align-items:center;gap:9px;font-size:20px;font-weight:650}
.tree-overview h2 span{font-size:13px;font-weight:400;color:var(--muted);border-left:1px solid var(--border-strong);padding-left:12px;margin-left:3px}
.tree-overview p{color:var(--muted);font-size:12px}
.tree-overview strong{color:var(--text)}
.tree-key{margin-left:14px;display:inline-flex;gap:7px;align-items:center}
.tree-key i{width:8px;height:8px;background:var(--accent);border-radius:2px}
.tree-key i.unavailable{background:var(--border-strong);margin-left:7px}
.tree-scroll{overflow-x:auto;border:1px solid var(--border);border-radius:12px;background:var(--surface);scrollbar-color:var(--border-strong) var(--surface);scrollbar-width:thin;overscroll-behavior-x:contain}
.tree-canvas{position:relative;min-width:100%;margin:0 auto;background:linear-gradient(90deg,transparent var(--tree-special-start),var(--sunken) var(--tree-special-start))}
.tree-lane-label{position:absolute;top:10px;color:var(--muted);font-size:12px;font-weight:600;letter-spacing:.4px}
.research-label{left:46px}.special-label{left:var(--tree-special-start)}
.tree-lane-label span{margin-left:12px;font-weight:400;color:var(--faint);font-size:11px}
.tree-lane-divider{position:absolute;top:42px;left:calc(var(--tree-special-start) - 14px);border-left:1px dashed var(--border-strong)}
.tree-rank-heading{position:absolute;left:12px;right:12px;height:32px;display:flex;align-items:center;gap:10px;pointer-events:none}
.tree-rank-heading h3{font-family:var(--mono);font-size:13px;width:30px;color:var(--accent);line-height:1.15}
.tree-rank-heading h3 span{font-family:var(--sans);display:block;font-size:10px;font-weight:400;color:var(--muted);margin-top:2px}
.tree-rank-heading>span{height:1px;flex:1;background:var(--border)}
.tree-node{position:absolute;z-index:1}
.tree-card{height:var(--tree-card-h);padding:6px 8px;display:flex;flex-direction:column;text-decoration:none;border:1px solid var(--border-strong);border-radius:6px;overflow:hidden;background:var(--panel);transition:border-color .15s,box-shadow .15s}
.tree-card.available{border-color:var(--tree-filed-line);box-shadow:inset 3px 0 0 var(--tree-filed-line);background:var(--tree-filed-bg);color:var(--tree-filed-text)}
.tree-card.available:hover{border-color:var(--accent);box-shadow:inset 3px 0 0 var(--tree-filed-line),0 4px 14px var(--accent-soft);filter:brightness(1.04)}
.tree-card>strong{font-size:13px;font-weight:650;line-height:16px;display:-webkit-box;-webkit-box-orient:vertical;-webkit-line-clamp:2;overflow:hidden;overflow-wrap:anywhere;flex-shrink:0}
.tree-card>small{font-size:11px;color:inherit;opacity:.85;white-space:nowrap;text-overflow:ellipsis;overflow:hidden;line-height:16px;flex-shrink:0}
.tree-card-bottom{display:flex;align-items:end;justify-content:space-between;gap:3px;margin-top:auto}
.tree-card-bottom b{font-size:16px;line-height:19px;font-variant-numeric:tabular-nums;color:inherit}
.tree-card-status{font-size:10px;line-height:14px;font-weight:600;white-space:nowrap}
.tree-card.unavailable{background:var(--tree-empty-bg);border:1px dashed var(--tree-empty-line);color:var(--tree-empty-text)}
.tree-card.unavailable b{font-weight:500;color:inherit}
.tree-card.located,.folder-toggle.located{outline:3px solid var(--sky);outline-offset:3px;box-shadow:0 0 0 6px var(--sky-soft)}
.tree-folder{border-radius:8px}
.folder-toggle{display:flex;flex-direction:column;text-align:left;width:100%;height:var(--tree-card-h);padding:6px 8px;gap:2px;border:1px solid var(--border-strong);background:var(--raised);border-radius:6px}
.folder-toggle.has-archive{background:var(--tree-filed-bg);border-color:var(--tree-filed-line);color:var(--tree-filed-text)}
.folder-toggle.no-archive{background:var(--tree-empty-bg);border:1px dashed var(--tree-empty-line);color:var(--tree-empty-text)}
.folder-caption{display:flex;gap:5px;align-items:center;color:var(--muted);font-size:11px;width:100%;line-height:14px}
.folder-caption>span:first-child{color:var(--accent);font-size:18px}
.folder-chevron{margin-left:auto;font-size:17px}
.folder-toggle>strong{font-size:12px;line-height:15px;font-weight:650;display:-webkit-box;-webkit-box-orient:vertical;-webkit-line-clamp:2;overflow:hidden}
.folder-meta{display:flex;justify-content:space-between;align-items:center;gap:3px;margin-top:auto;width:100%;color:var(--muted);font-size:9px;line-height:14px}
.folder-meta b{color:var(--text);font-size:11px}
.folder-members{display:grid;gap:8px;padding:12px 0 0}
.folder-members .tree-card{margin-left:8px;width:calc(var(--tree-card-w) - 8px)}
.folder-members:before{content:'';position:absolute;top:calc(var(--tree-card-h) + 6px);left:2px;bottom:12px;border-left:1px solid var(--border-strong)}
.tree-connectors{position:absolute;top:0;left:0;pointer-events:none;overflow:visible}
.tree-edge{fill:none;stroke:var(--border-strong);stroke-width:1.7}
#tree-arrow path{fill:var(--border-strong)}
.tree-footer{font-size:12px;color:var(--muted);padding:20px 4px 0;line-height:1.8}
.tree-footer details{margin-top:8px}.tree-footer summary{cursor:pointer;color:var(--accent)}
.tree-footer details p{margin-top:8px;max-width:900px}
.archive-nav{display:flex;align-items:center;gap:18px;max-width:1220px;margin:14px auto 0;padding:0 44px;font-size:13px}
.archive-nav>span{color:var(--faint);font-size:12px}
.tree-back{text-decoration:none;color:var(--accent);font-weight:600;min-height:42px;display:flex;align-items:center}
.archive-nav>button{margin-left:auto;border-radius:999px;padding:5px 14px;font-size:13px}
.tree-quick-top{background:transparent;font-size:12px;border-radius:999px;white-space:nowrap}
.archive-search-dialog{border:1px solid var(--border-strong);border-radius:14px;background:var(--surface);color:var(--text);width:min(540px,calc(100vw - 28px));max-height:min(680px,85dvh);padding:20px;box-shadow:var(--shadow)}
.archive-search-dialog::backdrop{background:rgba(0,0,0,.4);backdrop-filter:blur(3px)}
.quick-heading{display:flex;align-items:center;justify-content:space-between;margin-bottom:12px}
.quick-heading h2{font-size:20px}.quick-heading button{border:0;background:transparent;font-size:22px;padding:2px 12px}
.archive-search-dialog label{font-size:13px;color:var(--muted);display:block;margin-bottom:5px}
.archive-search-dialog input{width:100%;border:1px solid var(--border);border-radius:8px;background:var(--sunken);padding:10px;font-size:16px}
#quick-results p{font-size:12px;color:var(--muted);margin:12px 0}
#quick-results a{display:block;text-decoration:none;padding:10px;border-radius:8px;font-weight:600}
#quick-results a:hover{background:var(--accent-soft)}
#quick-results small{display:block;font-size:12px;font-weight:400;color:var(--muted)}
.tree-load-error{padding:20px;color:var(--amber)}
@media(max-width:800px){
  .tree-home{padding:20px 12px 32px}
  .tree-intro{align-items:start;gap:10px;margin-bottom:18px;flex-direction:column}
  .tree-intro h1{font-size:26px}.tree-intro p{font-size:12px}
  .tree-preview-label{font-size:10px;padding:2px 8px;white-space:normal}
  .tree-countries{padding:5px;gap:3px}.tree-countries button{min-width:70px;flex:none;gap:5px;padding:6px;min-height:40px;font-size:12px}
  .tree-countries img{width:19px;height:13px}
  .tree-tools{gap:7px;padding:9px 8px;flex-wrap:wrap}
  .tree-search-wrap{width:100%}.tree-search-wrap input{font-size:16px}.tree-search-wrap .search-box{height:42px}
  .tree-modes{margin-left:auto}.tree-modes button{min-height:32px;padding:4px 15px}
  .tree-rank-nav{padding:0 8px 8px;gap:4px;justify-content:space-between}
  .tree-rank-nav button{min-width:29px;min-height:32px;font-size:11px}
  .tree-rank-nav>span:first-child{font-size:10px;margin-right:0}.tree-swipe-hint{display:none}
  .tree-overview{align-items:start;flex-direction:column;margin-top:20px;gap:7px}.tree-overview h2{font-size:18px}
  .tree-key{margin-left:8px;gap:4px;font-size:10px}
  .tree-scroll{border-radius:8px}
  .tree-controls{border-radius:8px}
  .nav-ready .layout main{padding:6px 16px 30px}
  .archive-nav{padding:0 14px;margin-top:4px;gap:8px}.archive-nav>span{display:none}.archive-nav>button{font-size:12px}
  .tree-quick-top{font-size:11px;padding:5px 8px}.nav-ready .topbar-tools{gap:5px}
  .nav-ready .topbar .edition{display:none}
  .archive-search-dialog{padding:16px}
}
@media(prefers-reduced-motion:reduce){.tree-card{transition:none}}