/* The article on /b/{slug}, in the same Signal chrome as the rest of the site (style.css).
   Every article opens with a summary band under the header. The deep dive follows:
   full-bleed when the artifact is a complete page (.dive-full), otherwise in the
   Signal dive section (.dive-sig). Quiz, sources and pager sit in the site column. */
.article{--bg:#0a0a0a; --surface:#141414; --sunk:#262626; --ink:#f2f2f0; --soft:#d9d9d4; --muted:#8a8a86; --rule:#262626;
  --accent:oklch(0.89 0.19 125); --accent-ink:#0a0a0a; --ok:#5CC98E; --bad:#FF7A61; --warm:#FF8A63;
  --chip-l:74%; --chip-bg-l:20%;
  --display:"Archivo",system-ui,sans-serif; --body:"Archivo",system-ui,sans-serif;
  --mono:"JetBrains Mono",ui-monospace,Menlo,monospace;
  display:block;background:var(--bg);color:var(--ink);font-family:var(--body);font-size:18px;line-height:1.6;padding:0 0 64px;color-scheme:dark}
.article a{color:inherit}
.article :focus-visible{outline:2px solid var(--accent);outline-offset:3px}
.article>:not(.intro):not(.dive-full):not(.dive-sig){max-width:1320px;margin:48px auto 0;padding-inline:max(24px,env(safe-area-inset-left))}
.article .eyebrow,.article .intro-eyebrow{font-family:var(--mono);font-size:12.5px;letter-spacing:.08em;text-transform:uppercase;color:var(--muted)}
.article .section-title{font-family:var(--display);font-weight:900;font-size:clamp(28px,3.4vw,40px);line-height:1;letter-spacing:-.04em;text-transform:uppercase;margin:0}
.article .chip{--c:hsl(var(--h) 62% var(--chip-l));display:inline-flex;align-items:center;font-family:var(--display);font-weight:700;font-size:13px;
  text-decoration:none;color:var(--c);background:hsl(var(--h) 70% var(--chip-bg-l));padding:4px 11px;border-radius:999px}
.article .chip:hover{filter:saturate(1.3)}
.article .dot{display:inline-block;width:9px;height:9px;border-radius:50%;background:hsl(var(--h) 62% var(--chip-l));margin-right:8px;flex:none}
.article .chips{display:flex;flex-wrap:wrap;gap:8px}
.article .break-meta{display:flex;align-items:center;gap:14px;flex-wrap:wrap;font-family:var(--mono);font-size:13px;color:var(--muted)}
.article .tags{list-style:none;display:flex;flex-wrap:wrap;gap:8px;margin:18px 0 0;padding:0;font-family:var(--mono);font-size:13px}
.article .tags a{color:var(--muted);text-decoration:none;border:1px solid var(--rule);border-radius:999px;padding:3px 10px}
.article .tags a:hover{color:var(--ink);border-color:var(--muted)}
.article .hook p{margin:0 0 .8em}
.article .hook p:last-child{margin-bottom:0}
.article .timer{position:relative;aspect-ratio:1}
.article .timer svg{width:100%;height:100%;transform:rotate(-90deg)}
.article .t-track{fill:none;stroke:var(--sunk)}
.article .t-arc{fill:none;stroke:var(--accent);stroke-linecap:round;stroke-dasharray:100 100;stroke-dashoffset:0;transition:stroke .4s}
.article .timer.done .t-arc{stroke:var(--warm)}
.article .t-label{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;line-height:1}
.article .btn{display:inline-flex;align-items:center;gap:8px;font-family:var(--mono);font-weight:700;font-size:13px;letter-spacing:.06em;text-transform:uppercase;
  text-decoration:none;background:var(--accent);color:var(--accent-ink);padding:12px 18px;border:1px solid var(--accent)}
.article .btn:hover{filter:brightness(1.08);color:var(--accent-ink)}

/* Deep dive for fragment articles: same flat Signal section as the summary band. */
.article .dive-sig{border-bottom:1px solid var(--rule)}
.article .dive-sig-in{max-width:1320px;margin:0 auto;padding:44px max(24px,env(safe-area-inset-left)) 40px}
.article .dive-head{display:flex;flex-direction:column;gap:10px;margin-bottom:22px}
.article .dive-head h2{font-family:var(--display);font-weight:900;font-size:clamp(28px,3.6vw,44px);line-height:1;letter-spacing:-.04em;margin:0;text-wrap:balance}
.article .dive-frame{width:100%;border:0;height:600px;display:block;background:transparent;color-scheme:dark}

/* Quiz, sources, pager */
.article .quiz{display:flex;flex-direction:column;gap:26px}
.article .q{border:0;margin:0;padding:0;display:flex;flex-direction:column;gap:10px;max-width:820px}
.article .q legend{font-family:var(--display);font-weight:700;font-size:19px;line-height:1.3;margin-bottom:10px;padding:0}
.article .opts{display:flex;flex-direction:column;gap:8px}
.article .opt{display:flex;align-items:center;gap:12px;text-align:left;font:inherit;font-size:17px;color:var(--ink);background:var(--surface);
  border:1px solid var(--rule);padding:12px 14px;cursor:pointer}
.article .opt:hover{border-color:var(--accent)}
.article .opt-key{font-family:var(--mono);font-size:13px;width:26px;height:26px;display:grid;place-items:center;background:var(--sunk);color:var(--muted);flex:none}
.article .opt.right{border-color:var(--ok);background:color-mix(in srgb,var(--ok) 14%,var(--surface))}
.article .opt.right .opt-key{background:var(--ok);color:var(--bg)}
.article .opt.wrong{border-color:var(--bad);background:color-mix(in srgb,var(--bad) 12%,var(--surface))}
.article .opt.wrong .opt-key{background:var(--bad);color:var(--bg)}
.article .why{margin:0;font-size:16px;color:var(--muted)}
.article .why b{color:var(--ink)}
.article .sources ul{list-style:none;margin:16px 0 0;padding:0;display:flex;flex-direction:column;gap:8px;font-size:16px}
.article .sources a{color:var(--accent)}
.article .sources a:hover{color:var(--ink)}
.article .sources span{font-family:var(--mono);font-size:12.5px;color:var(--muted);margin-left:6px}
.article .pager{display:grid;grid-template-columns:1fr auto 1fr;gap:16px;align-items:center;border-top:1px solid var(--rule);padding-top:28px}
.article .pager-link{display:flex;flex-direction:column;gap:4px;text-decoration:none;font-family:var(--display);font-weight:700;font-size:16px;line-height:1.3}
.article .pager-link small{font-family:var(--mono);font-weight:400;font-size:12px;letter-spacing:.06em;text-transform:uppercase;color:var(--muted)}
.article .pager-link:hover{color:var(--accent)}
.article .pager-link.next{text-align:right}
@media (max-width:820px){
.article .dive-sig-in{padding-top:30px;padding-bottom:28px}
.article .pager{grid-template-columns:1fr;text-align:left}
.article .pager-link.next{text-align:left}
}

/* Summary band (every article) and the full-bleed dive for standalone artifacts. */
.article .intro{--bg:#0a0a0a;--surface:#141414;--sunk:#262626;--ink:#f2f2f0;--muted:#8a8a86;--rule:#262626;--accent:oklch(0.89 0.19 125);--accent-ink:#0a0a0a;
  --chip-l:74%;--chip-bg-l:20%;--display:"Archivo",system-ui,sans-serif;
  background:var(--bg);color:var(--ink);border-bottom:1px solid var(--rule);color-scheme:dark}
.article .intro-in{max-width:1320px;margin:0 auto;padding:36px max(24px,env(safe-area-inset-left)) 32px;
  display:grid;grid-template-columns:minmax(0,1.05fr) minmax(0,1fr);gap:48px;align-items:start}
.article .intro h1{font-family:var(--display);font-weight:900;font-size:clamp(30px,4vw,52px);line-height:.98;letter-spacing:-.035em;margin:16px 0 0;text-wrap:balance}
.article .intro .tags{margin-top:20px}
.article .intro .tags a{color:var(--muted);border-color:var(--rule)}
.article .intro .tags a:hover{color:var(--ink);border-color:var(--muted)}
.article .intro-sum{border-left:1px solid var(--rule);padding-left:40px}
.article .intro-sum-head{display:flex;align-items:center;gap:12px;margin-bottom:12px}
.article .intro .timer{width:46px;align-self:auto;flex:none}
.article .intro .t-track,.article .intro .t-arc{stroke-width:11}
.article .intro .t-label span{font-family:var(--mono);font-weight:700;font-size:15px;letter-spacing:0}
.article .intro .t-label small{display:none}
.article .intro .timer.done .t-label span{font-size:9px;text-transform:uppercase;letter-spacing:.04em}
.article .intro-eyebrow{font-family:var(--mono);font-size:12.5px;letter-spacing:.08em;text-transform:uppercase;color:var(--muted)}
.article .intro .hook{font-family:var(--display);font-size:18px;line-height:1.55;color:#d9d9d4;max-width:none}
.article .intro .hook em{color:var(--accent);font-style:normal}
.article .intro-fact{margin:14px 0 0;font-size:15px;color:var(--muted)}
.article .intro-fact b{color:var(--ink);font-family:var(--mono)}
.article .intro-go{display:inline-flex;align-items:center;gap:8px;margin-top:20px;font-family:var(--mono);font-size:13px;font-weight:700;letter-spacing:.06em;
  text-transform:uppercase;text-decoration:none;color:var(--accent-ink);background:var(--accent);padding:10px 16px}
.article .intro-go:hover{filter:brightness(1.08);color:var(--accent-ink)}
.article .dive-full{scroll-margin-top:0}
.article .dive-full .dive-frame{width:100%;border:0;display:block;min-height:70vh}
@media (max-width:820px){
.article .intro-in{grid-template-columns:1fr;gap:24px;padding-top:26px;padding-bottom:24px}
.article .intro-sum{border-left:0;padding-left:0;border-top:1px solid var(--rule);padding-top:20px}
.article .intro .hook{font-size:16.5px}
}