/* Shared paper, type and rules; the homepage owns the single persistent background. */
.library-view,.reader-view,.route-loader{
  --library-paper:#f6f5f1;
  --library-ink:#0b1120;
  --library-muted:#646a75;
  --library-blue:#1d4ed8;
  --library-rule:rgba(11,17,32,.13);
  --library-blue-frame:rgba(29,78,216,.44);
  --library-blue-rule:rgba(29,78,216,.18);
  font-family:"Segoe UI","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  color:var(--library-ink);
  -webkit-font-smoothing:antialiased;
}
.library-view[hidden],.reader-view[hidden]{display:none!important}
.library-view *,.reader-view *,.route-loader *{box-sizing:border-box}
.library-view{--library-list-gutter:clamp(20px,2.5vw,44px);position:relative;z-index:2;min-height:100svh;padding:calc(var(--preview-nav-offset,104px) + clamp(32px,6vw,88px) - clamp(24px,2vw,32px)) clamp(20px,5vw,88px) 0}
.library-shell{width:min(100%,1280px);margin:0 auto}
/* The page heading and tools share the expanded paper edges; article text retains its inset. */
.library-heading,.library-tools,.library-list-heading{margin-inline:calc(-1 * var(--library-list-gutter))}
.library-heading{display:flex;align-items:flex-end;justify-content:space-between;gap:40px;padding-bottom:clamp(32px,4vw,58px)}
.library-eyebrow,.reader-kicker,.route-loader-kicker{margin:0;font-size:11px;font-weight:650;letter-spacing:.14em;line-height:1.6;color:var(--library-muted)}
.library-heading h1{margin:14px 0 18px;font-size:clamp(36px,4.5vw,64px);line-height:1.15;letter-spacing:-.055em;font-weight:650}
.library-title-dot{color:var(--library-blue);padding-left:.02em}
.library-sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.library-title-glyph,.library-stream-token{display:inline-block}
.library-stream-token{white-space:pre-wrap}
.library-intro{max-width:36em;margin:0;color:var(--library-muted);font-size:clamp(14px,1.08vw,16px);line-height:1.9}
.library-total{display:grid;gap:6px;flex-shrink:0;text-align:right;margin:0 0 2px;color:var(--library-muted);font-size:12px;white-space:nowrap}
.library-total strong{color:var(--library-ink);font-size:clamp(38px,4vw,58px);font-weight:500;letter-spacing:-.055em;line-height:1;font-variant-numeric:tabular-nums}
.library-tools{display:flex;justify-content:space-between;align-items:flex-end;gap:24px;border-top:1px solid var(--library-rule);border-bottom:1px solid var(--library-rule);padding:22px 0}
.library-search-wrap{display:flex;align-items:center;gap:24px;flex:1;max-width:640px;min-width:0}
.library-search-wrap label{font-size:12px;color:var(--library-muted);white-space:nowrap}
.library-search-wrap input{display:block;min-width:0;width:100%;height:42px;padding:9px 12px;border:1px solid var(--library-rule);border-radius:6px;background:rgba(246,245,241,.74);font:inherit;font-size:14px;line-height:1.5;color:var(--library-ink);box-shadow:none;transition:border-color .18s,background .18s}
.library-search-wrap input::placeholder{color:#8b8f96}
.library-search-wrap input:hover{border-color:rgba(11,17,32,.3)}
.library-search-wrap input:focus{border-color:var(--library-blue);background:var(--library-paper)}
.library-sort,.library-clear{flex-shrink:0;min-height:42px;border:1px solid var(--library-rule);border-radius:6px;background:transparent;padding:9px 16px;font:inherit;font-size:12px;font-weight:600;line-height:1.5;color:var(--library-ink);cursor:pointer;transition:color .18s,border-color .18s,background .18s}
.library-sort:hover,.library-clear:hover{color:var(--library-blue);border-color:rgba(29,78,216,.4);background:rgba(29,78,216,.035)}
.library-list-heading{display:flex;justify-content:space-between;gap:20px;align-items:center;padding:27px 0 13px;font-size:11px;color:var(--library-muted)}
.library-list-heading>span{letter-spacing:.1em;font-weight:650}
.library-list-heading p{margin:0}
/* Keep the expanded list edges; each entry reads vertically within a comfortable text measure. */
.library-list{margin-inline:calc(-1 * var(--library-list-gutter));border-top:1px solid var(--library-blue-rule);background:transparent}
.library-article{display:flex;flex-direction:column;align-items:flex-start;padding:26px 0 27px;border-bottom:1px solid var(--library-blue-rule);color:inherit;text-decoration:none;background:transparent;transition:transform .22s ease}
.library-article[hidden]{display:none!important}
.library-index{color:inherit;font:inherit;font-variant-numeric:tabular-nums}
.library-meta{display:flex;flex-wrap:wrap;align-items:center;gap:18px;margin:0 0 10px;color:var(--library-blue);font-size:clamp(13px,1vw,15px);font-weight:550;line-height:1.55;letter-spacing:.025em}
.library-copy{width:100%;max-width:1060px}
.library-copy h2{margin:0 0 9px;font-size:clamp(23px,1.9vw,28px);font-weight:600;line-height:1.4;letter-spacing:-.025em;overflow-wrap:anywhere;transition:color .18s}
.library-copy>p:not(.library-meta){display:-webkit-box;-webkit-box-orient:vertical;-webkit-line-clamp:2;line-clamp:2;max-width:62em;max-block-size:3.4em;margin:0;overflow:hidden;color:#465570;font-size:clamp(15px,1.08vw,17px);line-height:1.7;overflow-wrap:anywhere}
.library-open{align-self:flex-start;margin-top:14px;white-space:nowrap;font-size:clamp(14px,1vw,15px);font-weight:600;line-height:1.6;color:var(--library-blue);transition:color .18s}
.library-article:hover h2,.library-article:hover .library-open{color:var(--library-blue)}
.library-article:focus-visible{outline-offset:4px!important;transform:translateX(.375rem)}
@media(hover:hover){.library-article:hover{transform:translateX(.375rem)}}
.library-empty{margin-inline:calc(-1 * var(--library-list-gutter));padding:58px 0;text-align:left;border-top:1px solid var(--library-blue-rule);border-bottom:1px solid var(--library-blue-rule);color:var(--library-muted);font-size:15px;line-height:1.8}
.library-empty[hidden]{display:none!important}
.library-empty-title{color:var(--library-ink);font-size:19px;font-weight:600;margin:0 0 10px}
.library-empty p:not(.library-empty-title){margin:0 0 24px}
.library-footer{display:flex;justify-content:space-between;gap:20px;padding:36px 0 46px;color:var(--library-muted);font-size:11px;line-height:1.7}
.library-footer a{color:var(--library-ink);text-decoration:none;text-underline-offset:4px}
.library-footer a:hover{color:var(--library-blue);text-decoration:underline}

/* The iframe keeps its original article TOC and the only reading scroll container. */
.reader-view{position:relative;z-index:2;height:100svh;min-height:0;padding:0;display:flex;flex-direction:column;overflow:hidden;box-sizing:border-box}
.reader-toolbar{width:min(calc(100% - 2 * clamp(12px,2vw,32px)),1720px);margin:0 auto;display:flex;align-items:center;justify-content:space-between;gap:24px;flex:0 0 auto;padding:12px 14px 15px;border-bottom:1px solid var(--library-blue-rule)}
.reader-caption{min-width:0}
.reader-kicker{font-size:10px;letter-spacing:.1em;line-height:1.5;margin:0 0 4px}
.reader-toolbar h1{margin:0;max-width:70vw;font-size:clamp(13px,1.1vw,17px);line-height:1.6;font-weight:600;letter-spacing:-.01em;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.reader-actions{display:flex;align-items:center;gap:18px;flex-shrink:0}
.reader-actions a{font-size:11px;line-height:1.6;color:var(--library-muted);text-decoration:none;white-space:nowrap;transition:color .18s}
.reader-actions .reader-return{display:inline-flex;align-items:center;justify-content:center;min-height:36px;padding:7px 15px;border:1px solid var(--library-blue-frame);border-radius:6px;background:rgba(29,78,216,.04);color:var(--library-blue);font-size:12px;font-weight:600;line-height:1.5;transition:color .18s,border-color .18s,background .18s,transform .18s}
.reader-actions a:hover{color:var(--library-blue);text-decoration:underline;text-underline-offset:4px}
.reader-actions .reader-return:hover{border-color:var(--library-blue);background:rgba(29,78,216,.09);text-decoration:none}
.reader-actions .reader-return:active{transform:translateY(1px)}
.reader-slot{width:100%;max-width:none;margin:0;min-height:0;flex:1;position:relative;overflow:hidden}
.reader-frame{display:block;width:100%;height:100%;border:0;background:transparent;box-sizing:border-box}

/* Display only after the router's genuine network delay; no invented completion percentage. */
.route-loader{--loader-error:#9b442b;--loader-error-track:rgba(155,68,43,.2);position:fixed;inset:0;z-index:5000;display:grid;place-items:center;padding:24px;background:rgba(246,245,241,.91);opacity:0;visibility:hidden;pointer-events:none;transition:opacity .2s ease,visibility .2s ease}
.route-loader.is-visible{opacity:1;visibility:visible;pointer-events:auto}
.route-loader-card{box-sizing:border-box;width:min(100%,480px);padding:35px 34px 28px;border:1px solid var(--library-rule);border-radius:10px;background:var(--library-paper);box-shadow:0 14px 65px -38px rgba(11,17,32,.23);overflow:hidden}
.route-loader-kicker{color:var(--library-blue);font-size:10px;letter-spacing:.09em;transition:color 420ms ease}
.route-loader h2{margin:14px 0 12px;font-size:clamp(24px,2vw,30px);line-height:1.35;letter-spacing:-.035em;font-weight:600}
.route-loader-detail{margin:0;color:var(--library-muted);font-size:13px;line-height:1.9;overflow-wrap:anywhere}
.route-loader-progress{position:relative;height:2px;margin:27px 0 24px;overflow:hidden;background:rgba(11,17,32,.1);transition:background-color 420ms ease}
.route-loader-progress::after{content:"";position:absolute;inset:0;background:var(--loader-error);opacity:0;transition:opacity 420ms ease}
.route-loader-progress span{position:absolute;inset:0;z-index:1;background:linear-gradient(90deg,var(--library-blue) 0 35%,transparent 35% 100%);opacity:1;transform:translateX(0);animation:library-loading 2.1s linear infinite;transition:opacity 390ms ease}
/* The preceding copy enters on the left while the current segment exits right. */
.route-loader-progress span::before{content:"";position:absolute;inset:0;transform:translateX(-100%);background:inherit}
.route-loader.is-error .route-loader-progress{background:var(--loader-error-track)}
/* Pause at the current phase, including its preceding copy, while blue crossfades into the full red rule. */
.route-loader.is-error .route-loader-progress span{animation-play-state:paused;opacity:0}
.route-loader.is-error .route-loader-progress::after{opacity:1}
.route-loader.is-error .route-loader-kicker{color:var(--loader-error)}
.route-loader-actions{display:flex;flex-wrap:wrap;align-items:center;justify-content:flex-end;gap:12px}
.route-loader-actions button{display:inline-flex;align-items:center;justify-content:center;border:1px solid var(--library-rule);border-radius:6px;background:transparent;padding:9px 13px;color:var(--library-ink);font:inherit;font-size:12px;font-weight:600;line-height:1.5;text-decoration:none;cursor:pointer;transition:color .18s,border-color .18s,background .18s}
.route-loader-actions button:hover{background:rgba(11,17,32,.035);border-color:rgba(11,17,32,.3)}
.route-loader-actions #route-loader-retry{background:var(--library-blue);border-color:var(--library-blue);color:white}
.route-loader-actions #route-loader-retry:hover{background:#1944bd}
.route-loader-actions button[hidden]{display:none!important}
:is(.library-view,.reader-view,.route-loader) :is(a,button,input):focus-visible{outline:2px solid var(--library-blue);outline-offset:4px}
:is(.library-heading h1,.reader-toolbar h1):focus{outline:none}
@keyframes library-loading{0%{transform:translateX(0)}100%{transform:translateX(100%)}}
@media(max-width:760px){
  .library-view{--library-list-gutter:8px;padding:calc(var(--preview-nav-offset,88px) + 8px) 24px 0}
  .library-heading{gap:22px;padding-bottom:30px}
  .library-heading h1{font-size:38px;margin:12px 0 16px}
  .library-eyebrow{font-size:10px;letter-spacing:.1em}
  .library-intro{font-size:14px;line-height:1.9}
  .library-total{font-size:10px;gap:7px;margin-bottom:3px}
  .library-total strong{font-size:40px}
  .library-tools{gap:14px;padding:18px 0;align-items:center}
  .library-search-wrap{display:block}
  .library-search-wrap label{display:block;font-size:12px;margin-bottom:8px}
  .library-search-wrap input{height:44px;font-size:16px;padding:9px 10px}
  .library-sort,.library-clear{min-height:44px}
  .library-sort{align-self:flex-end;padding:9px 12px;font-size:12px}
  .library-list-heading{font-size:11px;padding-top:23px;flex-wrap:wrap;gap:6px 14px}
  .library-article{padding:23px 0 24px}
  .library-meta{font-size:13px;gap:16px;margin-bottom:9px}
  .library-copy h2{font-size:22px;margin-bottom:9px;line-height:1.45}
  .library-copy>p:not(.library-meta){font-size:15px;line-height:1.7}
  .library-open{margin-top:13px;font-size:14px}
  .library-footer{font-size:12px;padding:22px 0 28px;align-items:center;gap:12px}
  .library-footer a{display:inline-flex;align-items:center;min-height:44px}
  .reader-toolbar{width:100%;padding:10px 18px 12px;gap:12px;box-sizing:border-box}
  .reader-toolbar h1{font-size:13px;max-width:100%}
  .reader-actions{gap:0}
  .reader-actions a{font-size:11px}
  .reader-actions .reader-return{min-height:44px;padding-inline:12px}
  .reader-kicker{font-size:9px;margin-bottom:3px}
  .route-loader{padding:max(16px,env(safe-area-inset-top,0px)) max(16px,env(safe-area-inset-right,0px)) max(16px,env(safe-area-inset-bottom,0px)) max(16px,env(safe-area-inset-left,0px));overflow-y:auto;overscroll-behavior:contain}
  .route-loader-card{padding:27px 25px 24px;margin-block:auto}
  .route-loader-actions button{min-height:44px;font-size:13px}
}
@media(max-height:480px){.route-loader{overflow-y:auto;overscroll-behavior:contain;align-items:start}.route-loader-card{margin-block:auto}}
@media(max-width:380px){.library-total{display:none}.library-view{--library-list-gutter:4px;padding-left:20px;padding-right:20px}.library-heading h1{font-size:34px}}
@media(prefers-reduced-motion:reduce){
  .library-view *,.reader-view *,.route-loader,.route-loader *,.route-loader *::before,.route-loader *::after{transition:none!important}
  .library-article:hover,.library-article:focus-visible{transform:none}
  .route-loader-progress span{animation:none;transform:none;width:100%;opacity:.5;background:var(--library-blue)}
  .route-loader-progress span::before{content:none}
}
@media(forced-colors:active){.library-list,.library-empty,.library-article,.library-tools,.reader-toolbar,.route-loader-card{border-color:CanvasText}.route-loader{--loader-error:CanvasText;--loader-error-track:GrayText}.route-loader-progress{--library-blue:Highlight;background:GrayText;forced-color-adjust:none}}