/* Layout: one reading column — edition masthead, featured paper, sections of paper cards, archive of past editions */
:root{
  --bg:#F2F4F7; --surface:#FFFFFF; --ink:#141A26; --muted:#5B6578; --line:#DDE2EA;
  --accent:#1F4FD1; --accent-soft:#E6ECFB;
  --irt:#1E7A55; --irt-soft:#E2F3EA; --eval:#A86A00; --eval-soft:#FBF1DC; --llm:#7A3FC4; --llm-soft:#F0E8FB;
  --f-display:"Bricolage Grotesque", "Avenir Next", "Segoe UI", system-ui, sans-serif;
  --f-serif:"Newsreader", Georgia, "Times New Roman", serif;
  --f-body:"IBM Plex Sans", "Helvetica Neue", Arial, system-ui, sans-serif;
  --f-mono:"IBM Plex Mono", ui-monospace, "SF Mono", Menlo, monospace;
  --r:12px;
}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]){
  --bg:#0E121A; --surface:#161B26; --ink:#E8ECF3; --muted:#9AA4B6; --line:#262E3D;
  --accent:#7D9BFF; --accent-soft:#1C2645;
  --irt:#5CC99A; --irt-soft:#14301F; --eval:#F0B44C; --eval-soft:#332712; --llm:#BB94F5; --llm-soft:#2A1D42;
  color-scheme:dark}}
:root[data-theme="dark"]{
  --bg:#0E121A; --surface:#161B26; --ink:#E8ECF3; --muted:#9AA4B6; --line:#262E3D;
  --accent:#7D9BFF; --accent-soft:#1C2645;
  --irt:#5CC99A; --irt-soft:#14301F; --eval:#F0B44C; --eval-soft:#332712; --llm:#BB94F5; --llm-soft:#2A1D42;
  color-scheme:dark}

*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font:15px/1.6 var(--f-body);-webkit-font-smoothing:antialiased}
.wrap{max-width:860px;margin:0 auto;padding:28px 16px 64px;display:flex;flex-direction:column;gap:32px}
a{color:var(--accent)}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:4px}
.mono{font-family:var(--f-mono);font-variant-numeric:tabular-nums}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}
main:focus{outline:none}

/* header */
header{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:16px}
.brand{display:flex;gap:14px;align-items:center;min-width:0;text-decoration:none;color:inherit}
.brand svg{flex:none}
h1{font:700 clamp(26px,4vw,34px)/1.05 var(--f-display);letter-spacing:-.02em;margin:0}
.sub{color:var(--muted);margin:4px 0 0;font-size:14px;max-width:52ch}
.tools{display:flex;gap:8px;align-items:center;flex:1 1 240px;justify-content:flex-end;min-width:0}
.search{flex:1;max-width:300px}
.search input{width:100%;font:inherit;font-size:14px;color:var(--ink);background:var(--surface);border:1px solid var(--line);border-radius:999px;padding:8px 14px}
.search input:focus{outline:2px solid var(--accent);outline-offset:1px}
.icon-btn{flex:none;width:38px;height:38px;border-radius:50%;border:1px solid var(--line);background:var(--surface);color:var(--ink);font-size:16px;cursor:pointer}
.icon-btn:hover{border-color:var(--muted)}

/* masthead */
.mast{border-top:3px solid var(--ink);padding-top:16px;display:flex;flex-direction:column;gap:10px}
.mast-row{display:flex;justify-content:space-between;align-items:baseline;gap:12px;flex-wrap:wrap;font-size:12px;letter-spacing:.1em;text-transform:uppercase;color:var(--muted)}
.mast-row b{color:var(--ink);font-weight:600}
.mast h2{font:500 clamp(19px,2.6vw,24px)/1.4 var(--f-serif);letter-spacing:-.01em;margin:0;text-wrap:pretty}
.counts{display:flex;gap:8px;flex-wrap:wrap}
.pager{display:flex;gap:8px;font-size:13px}
.pager a{text-decoration:none;color:var(--muted)}
.pager a:hover{color:var(--ink)}

/* section */
.section{display:flex;flex-direction:column;gap:14px}
.section-head{display:flex;align-items:center;gap:10px;font:700 13px var(--f-display);letter-spacing:.08em;text-transform:uppercase;color:var(--muted)}
.section-head::after{content:"";flex:1;height:1px;background:var(--line)}
.dot{width:9px;height:9px;border-radius:50%;background:var(--c)}

/* paper card */
.paper{--c:var(--accent);--cs:var(--accent-soft);background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:20px 22px;display:flex;flex-direction:column;gap:10px}
.paper[data-s="irt"]{--c:var(--irt);--cs:var(--irt-soft)}
.paper[data-s="avaliacao"]{--c:var(--eval);--cs:var(--eval-soft)}
.paper[data-s="llm"]{--c:var(--llm);--cs:var(--llm-soft)}
.paper h3{font:600 20px/1.3 var(--f-serif);margin:0;text-wrap:pretty}
.paper h3 a{color:inherit;text-decoration:none;background:linear-gradient(var(--c),var(--c)) 0 100%/0 2px no-repeat;transition:background-size .2s}
.paper h3 a:hover{background-size:100% 2px}
.authors{color:var(--muted);font-size:13px;margin:-4px 0 0}
.tldr{margin:0}
.why{margin:0;background:var(--cs);border-left:3px solid var(--c);border-radius:0 8px 8px 0;padding:10px 14px;font-size:14px}
.why b{color:var(--c);font-weight:600}
.meta{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap;font-size:12px;color:var(--muted)}
.tags{display:flex;gap:6px;flex-wrap:wrap}
.tag{font:500 11px var(--f-mono);border:1px solid var(--line);border-radius:999px;padding:2px 9px;color:var(--muted);background:none;cursor:pointer}
.tag:hover{color:var(--ink);border-color:var(--muted)}
.links{display:flex;gap:12px;align-items:center}
.links a{font-weight:500;text-decoration:none}
.links a:hover{text-decoration:underline}
.nov{display:inline-flex;gap:3px;align-items:center}
.nov i{width:7px;height:7px;border-radius:50%;background:var(--line)}
.nov i.on{background:var(--c)}

/* featured */
.paper.feat{border:none;background:var(--ink);color:var(--bg);padding:26px;gap:12px}
.paper.feat .eyebrow{font:600 11px var(--f-body);letter-spacing:.14em;text-transform:uppercase;color:var(--accent-soft);opacity:.85}
.paper.feat h3{font-size:clamp(22px,3.4vw,28px)}
.paper.feat h3 a{background-image:linear-gradient(var(--bg),var(--bg))}
.paper.feat .authors,.paper.feat .meta{color:color-mix(in srgb,var(--bg) 70%,transparent)}
.paper.feat .why{background:color-mix(in srgb,var(--bg) 10%,transparent);border-left-color:var(--bg)}
.paper.feat .why b{color:var(--bg)}
.paper.feat .links a{color:var(--bg)}
.paper.feat .tag{border-color:color-mix(in srgb,var(--bg) 30%,transparent);color:inherit}
.paper.feat .nov i{background:color-mix(in srgb,var(--bg) 25%,transparent)}
.paper.feat .nov i.on{background:var(--bg)}

/* archive */
.archive{display:flex;flex-direction:column;gap:0;border-top:1px solid var(--line)}
.archive a{display:grid;grid-template-columns:auto 1fr auto;gap:16px;align-items:baseline;padding:12px 4px;border-bottom:1px solid var(--line);text-decoration:none;color:var(--ink)}
.archive a:hover{background:var(--surface)}
.archive a[aria-current]{font-weight:600}
.archive .n{color:var(--muted);font-size:12px}
.archive .t{overflow:hidden;text-overflow:ellipsis;white-space:nowrap;min-width:0}
.archive .d{color:var(--muted);font-size:12px}

.empty,.loading{color:var(--muted);text-align:center;padding:40px 0}
.filter-note{display:flex;gap:10px;align-items:center;flex-wrap:wrap;font-size:14px;color:var(--muted)}
.filter-note button{font:inherit;font-size:13px;border:1px solid var(--line);background:var(--surface);color:var(--ink);border-radius:999px;padding:4px 12px;cursor:pointer}
.from{font-size:12px;color:var(--muted)}

footer{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;font-size:13px;color:var(--muted);border-top:1px solid var(--line);padding-top:16px}
footer a{text-decoration:none}

@media (max-width:560px){
  .paper{padding:16px}
  .paper.feat{padding:20px}
  .tools{justify-content:stretch}
  .search{max-width:none}
  .archive a{grid-template-columns:auto 1fr}
  .archive .d{display:none}
}