/* ScholarFlow viewer — "Editorial" layout. Theme follows the OS via
   prefers-color-scheme (the only JS is self-hosted KaTeX for math). Two-column
   claims use CSS grid so evidence aligns beside its claim and images never
   overflow. */
:root{
  --bg:#fcfcfd; --surface:#f4f4f8; --fg:#23232b; --muted:#6b6b78;
  --rule:#e3e3ec; --accent:#5b4bd6; --accent-ink:#4636c0;
  --hl-bg:rgba(91,75,214,.12); --hl-line:#5b4bd6;
  --ok:#1a7f37; --warn:#9a6700; --err:#b42318;
  --note-w:18rem; --gap:2.4rem; --content:42rem;
}
@media (prefers-color-scheme:dark){
  :root{ --bg:#15151b; --surface:#1e1e27; --fg:#e8e8f0; --muted:#a0a0b0;
    --rule:#2c2c39; --accent:#a99bff; --accent-ink:#c3b8ff;
    --hl-bg:rgba(169,155,255,.20); --hl-line:#a99bff;
    --ok:#4ac776; --warn:#d8a93a; --err:#ff7b6b; }
}
*{box-sizing:border-box}
html{color-scheme:light dark}
body{margin:0;background:var(--bg);color:var(--fg);
  font-family:-apple-system,system-ui,"Segoe UI","Noto Sans CJK SC","Source Han Sans SC",sans-serif;
  font-size:16px;line-height:1.7}
img{max-width:100%;height:auto;display:block}
a{color:var(--accent-ink)}
h1,h2,.paper-title{font-family:Georgia,"Songti SC","Noto Serif CJK SC",serif}

.paper{max-width:calc(var(--content) + var(--note-w) + var(--gap));margin:0 auto;padding:2rem 1.5rem 6rem}
h1{font-size:2rem;line-height:1.2;margin:.4rem 0 .2rem;letter-spacing:-.01em}
.subtitle{color:var(--muted);margin:.3rem 0 1.4rem}
.block-label{display:block;font-size:.68rem;letter-spacing:.12em;text-transform:uppercase;color:var(--accent-ink);margin-bottom:.35rem}

/* collection + error pages */
.paper-list{list-style:none;padding:0}
.paper-list li{margin:.9rem 0}
.paper-list a{font-weight:600;text-decoration:none}
.paper-meta{color:var(--muted);font-size:.85rem;margin-top:.15rem}
.status-badge{font-size:.66rem;text-transform:uppercase;letter-spacing:.05em;padding:.08rem .45rem;border:1px solid currentColor;border-radius:.3rem;margin-left:.4rem}
.status-completed{color:var(--ok)} .status-failed{color:var(--err)}
.status-reading,.status-processing,.status-parsed,.status-queued{color:var(--warn)}
.notice{background:var(--surface);border-left:3px solid var(--warn);padding:.6rem 1rem;border-radius:.3rem}

/* collection nav tabs + grouping toggle + blocks */
.coll-nav{display:flex;gap:.3rem;border-bottom:1px solid var(--rule);margin:0 0 1rem}
.coll-tab{text-decoration:none;font-weight:600;padding:.4rem .8rem;color:var(--muted);border-bottom:2px solid transparent;margin-bottom:-1px}
.coll-tab.active{color:var(--accent-ink);border-bottom-color:var(--accent)}
.coll-toggle{display:flex;align-items:center;gap:.4rem;font-size:.82rem;color:var(--muted);margin:0 0 1.8rem}
.coll-toggle a{text-decoration:none;color:var(--muted);padding:.1rem .55rem;border:1px solid var(--rule);border-radius:.3rem}
.coll-toggle a.active{color:var(--accent-ink);border-color:var(--accent)}
.coll-block{margin:0 0 1.8rem}
.coll-block .block-label{border-bottom:1px solid var(--rule);padding-bottom:.25rem;margin-bottom:.5rem}

/* abstract + outline */
.abstract-block{border-top:2px solid var(--accent);padding:.9rem 0 0;margin:0 0 1.6rem}
.outline-block{margin:0 0 2rem}
.outline-list{list-style:none;margin:0;padding:0;columns:2;column-gap:2rem}
.outline-item{padding:.12rem 0;break-inside:avoid}
.outline-num{color:var(--accent-ink);font-variant-numeric:tabular-nums;margin-right:.35rem}
.outline-page{color:var(--muted);font-size:.8rem}
.outline-l0{font-weight:700}
.outline-l1{margin-left:1.2rem} .outline-l2{margin-left:2.4rem} .outline-l3{margin-left:3.6rem}
.outline-l4{margin-left:4.8rem} .outline-l5{margin-left:6rem} .outline-l6{margin-left:7.2rem}

h2{font-size:1.4rem;margin:2.4rem 0 .8rem}

/* claim grid: body | evidence notes, aligned, never overflowing */
.claim{display:grid;grid-template-columns:minmax(0,1fr) var(--note-w);gap:var(--gap);align-items:start;margin:1.2rem 0}
.claim-body{min-width:0}
.claim-body p{margin:.3rem 0}
.claim-notes{min-width:0;border-left:2px solid var(--rule);padding-left:1.2rem}
.note{font-size:.84rem;line-height:1.55;color:var(--muted);margin-bottom:.8rem}
.marker{display:inline-block;font-size:.64rem;font-weight:700;letter-spacing:.03em;padding:.05rem .4rem;margin-right:.25rem;border-radius:.25rem;color:var(--accent-ink);border:1px solid var(--accent)}
.snip{color:var(--fg)}
.figure-note{margin:.5rem 0 .9rem}
.figure-note .thumb{border-radius:.5rem;box-shadow:0 1px 4px rgba(0,0,0,.18);max-height:14rem;width:auto}
.figure-note figcaption{font-size:.76rem;color:var(--muted);margin-top:.3rem}
.figure-inline{margin:1rem 0}
.figure-inline .thumb{border-radius:.6rem;box-shadow:0 2px 10px rgba(0,0,0,.2)}
.figure-inline figcaption{font-size:.84rem;color:var(--muted);margin-top:.5rem;line-height:1.55;border-left:2px solid var(--accent);padding-left:.7rem}

/* collapsible caption: clamp to two lines, expand on hover */
.cap-collapsible{display:-webkit-box;-webkit-box-orient:vertical;-webkit-line-clamp:2;line-clamp:2;overflow:hidden;cursor:zoom-in}
.cap-collapsible:hover{-webkit-line-clamp:99;line-clamp:99}

/* click-to-enlarge: pure-CSS full-screen overlay */
.thumb-zoom{display:block;cursor:zoom-in}
.thumb-zoom .lightbox-toggle{position:absolute;width:0;height:0;opacity:0}
.lightbox{display:none}
.lightbox-toggle:checked ~ .lightbox{display:flex;position:fixed;inset:0;z-index:50;
  background:rgba(0,0,0,.85);align-items:center;justify-content:center;padding:2rem;cursor:zoom-out}
.lightbox img{max-width:92vw;max-height:92vh;width:auto;border-radius:.4rem;box-shadow:none}

/* card pieces */
.cmp{border-collapse:collapse;font-size:.9rem;margin:.5rem 0}
.cmp th{color:var(--muted);font-weight:600}
.cmp th,.cmp td{border-bottom:1px solid var(--rule);padding:.3rem .8rem .3rem 0;text-align:left}
.meth-problem{color:var(--muted)} .meth-arrow{color:var(--accent)} .meth-method{font-weight:600}
.mod-label{color:var(--muted);font-size:.85rem}
.result-metric{margin:.2rem 0}
.badge-self{font-size:.62rem;text-transform:uppercase;letter-spacing:.05em;padding:.05rem .4rem;border-radius:.25rem;border:1px solid var(--accent);color:var(--accent-ink)}
.card-list{list-style:none;padding:0;margin:.3rem 0}

/* KaTeX: keep wide display equations scrollable instead of overflowing. */
.katex-display{overflow-x:auto;overflow-y:hidden;padding:.2rem 0;margin:.6rem 0}
.katex{font-size:1.05em}

@media (max-width:840px){
  .outline-list{columns:1}
  .claim{grid-template-columns:1fr;gap:.7rem}
  .claim-notes{border-left:0;border-top:2px solid var(--rule);padding:.6rem 0 0}
  .figure-note .thumb{max-height:none}
}