/* DP Science Cafe — one stylesheet, no framework. Figtree is self-hosted (OFL, see /assets/fonts/OFL.txt). */
@font-face{font-family:"Figtree";font-style:normal;font-weight:300 900;font-display:swap;src:url(/assets/fonts/figtree.woff2) format("woff2")}
@font-face{font-family:"Figtree";font-style:italic;font-weight:300 900;font-display:swap;src:url(/assets/fonts/figtree-italic.woff2) format("woff2")}
:root{
  --bg:#f4f6f8; --fg:#1c2530; --muted:#68737f; --line:#e1e6ec; --accent:#1b3556; --accent-fg:#fff;
  --hl:#6b4a1c; --hl-bg:#f7efe3; --ok:#1f6f45; --bad:#9b2c2c; --panel:#fff; --rail:#eef1f5; --tint:#e8edf4; --top-bg:#fff;
  --shadow:0 1px 2px rgba(28,37,48,.06),0 8px 20px -14px rgba(28,37,48,.25);
  --maxw:40rem; --railw:16rem; --fs:1.125rem; --lh:1.65; --radius:.9rem; --radius-s:.6rem;
  --font-body:"Figtree",system-ui,-apple-system,"Segoe UI",sans-serif; --font-head:var(--font-body);
}
@media (prefers-color-scheme:dark){:root{--bg:#15191e;--fg:#e6e9ee;--muted:#98a2ae;--line:#2a3138;--accent:#9db9dc;--accent-fg:#0f1620;--hl:#dcb277;--hl-bg:#2a2115;--ok:#7fd59a;--bad:#f08a8a;--panel:#1c2229;--rail:#1a1f26;--tint:#232b35;--top-bg:#1c2229;--shadow:0 1px 2px rgba(0,0,0,.3)}}
*{box-sizing:border-box}
html{font-size:var(--fs);-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--fg);font-family:var(--font-body);font-size:1rem;line-height:var(--lh)}
a{color:inherit;text-underline-offset:.15em}
a:hover{color:var(--accent)}
.skip{position:absolute;left:-999px;top:0;background:var(--accent);color:var(--accent-fg);padding:.5rem}
.skip:focus{left:.5rem}
.top{display:flex;align-items:center;gap:1rem;padding:.6rem 1rem;border-bottom:1px solid var(--line);background:var(--top-bg,transparent);color:var(--top-fg,inherit)}
.brand{font-weight:600;text-decoration:none;letter-spacing:.01em;display:inline-flex;align-items:center;gap:.55rem;font-family:var(--font-head)}
.brand img{height:1.7rem;width:auto;display:block}
.rail-toggle{border:1px solid var(--line);background:var(--panel);color:var(--fg);padding:.35rem .7rem;border-radius:var(--radius);font:inherit}
.frame{display:grid;grid-template-columns:1fr;max-width:calc(var(--maxw) + var(--railw) + 4rem);margin:0 auto}
main{padding:1.25rem 1rem 3rem;max-width:var(--maxw);width:100%}
.foot{border-top:1px solid var(--line);padding:1.25rem 1rem 2rem;color:var(--muted);font-size:.9rem;text-align:center}
.foot p{margin:.25rem 0}
.rail{background:var(--rail);border-bottom:1px solid var(--line);padding:.9rem 1rem;font-size:.92rem}
.rail ol,.rail ul{list-style:none;margin:0;padding:0}
.rail .path li{display:inline}
.rail .path li+li::before{content:" › ";color:var(--muted)}
.rail .path a{display:inline-block;padding:.15rem 0;min-height:1.5rem}
.rail .path a[aria-current]{font-weight:700;text-decoration:none}
.rail-h{margin:1rem 0 .3rem;color:var(--muted);font-size:.78rem;text-transform:uppercase;letter-spacing:.08em}
.rail .topics li,.rail .themes li{padding:.1rem 0}
.rail .topics a,.rail .themes a{text-decoration:none;display:block;padding:.2rem .5rem;border-radius:var(--radius-s)}
.rail .topics a[aria-current]{background:var(--accent);color:var(--accent-fg)}
.rail .topics a[aria-current] .code{color:inherit}
.code{font-variant-numeric:tabular-nums;color:var(--muted);font-weight:600;margin-right:.2em}
.modes{display:flex;gap:.4rem;margin:.9rem 0 0}
.modes a,.modes-inline a{flex:1;text-align:center;text-decoration:none;border:1px solid var(--line);border-radius:var(--radius);padding:.4rem .5rem;background:var(--panel)}
.modes a[aria-current],.modes-inline a[aria-current]{background:var(--accent);color:var(--accent-fg);border-color:var(--accent)}
.hl-toggle{display:inline-flex;align-items:center;gap:.4rem;margin-top:.9rem;color:var(--muted)}
@media (min-width:60rem){
  .frame{grid-template-columns:var(--railw) 1fr;gap:2.5rem;padding:0 1rem}
  .rail{position:sticky;top:0;align-self:start;max-height:100vh;overflow:auto;border-bottom:0;border-right:1px solid var(--line);padding:1.25rem 1rem 1.25rem 0;background:transparent}
  .rail-toggle{display:none!important}
  main{padding-left:0}
}
@media (max-width:59.99rem){
  .rail-toggle[hidden]{display:inline-block}
  body.js .rail{display:none}
  body.js .rail.open{display:block}
}
h1,h2,h3,h4{font-family:var(--font-head);text-wrap:balance}
h1{font-size:2rem;line-height:1.15;margin:.2rem 0 .7rem;letter-spacing:-.01em;font-weight:600}
h2{font-size:1.3rem;margin:2rem 0 .6rem;font-weight:600}
h3{font-size:1.08rem;margin:1.4rem 0 .4rem;font-weight:600}
.kicker{color:var(--muted);margin:0;font-size:.88rem}
.lede{font-size:1.1rem;color:var(--muted);margin:.2rem 0 1rem}
.summary{font-size:1.08rem;line-height:1.55;margin:.4rem 0 1rem;max-width:36rem}
.summary.muted{color:var(--muted)}
.muted{color:var(--muted)}
.small{font-size:.85rem}
.status{color:var(--muted);font-size:.82rem;margin:.2rem 0 1.2rem}
.foot-status{border-top:1px solid var(--line);margin-top:2.5rem;padding-top:.8rem}
.linklike{font:inherit;color:inherit;background:none;border:0;padding:0;text-decoration:underline;cursor:pointer}
.specbox{border:1px solid var(--line);border-radius:var(--radius);background:var(--panel);padding:.6rem 1rem;margin:0 0 1.2rem}
.specbox summary{cursor:pointer;font-weight:600}
.spec-list{margin:.5rem 0 .3rem;padding-left:0;list-style:none;columns:2;column-gap:1.5rem;font-size:.92rem}
.spec-list li{break-inside:avoid;padding:.15rem 0}
.spec-list a{text-decoration:none}
.spec-list a:hover{text-decoration:underline}
@media (max-width:40rem){.spec-list{columns:1}.summary{font-size:1rem}}
.points{margin:.3rem 0 .6rem;padding-left:1.2rem}
.points li{margin:.35rem 0;line-height:1.5}
.exam-frame{border:1px solid var(--line);border-radius:var(--radius);padding:.7rem 1rem;background:var(--panel);margin:.8rem 0}
.exam-frame h4{margin:0 0 .4rem;font-size:1rem}
.meta{color:var(--muted);font-size:.9rem}
.badge{display:inline-block;font-size:.68rem;font-weight:700;letter-spacing:.06em;color:var(--hl);background:var(--hl-bg);border-radius:.3rem;padding:.05rem .4rem;vertical-align:middle}
.modes-inline{display:flex;gap:.6rem;margin:1rem 0 1.5rem;flex-wrap:wrap}
.modes-inline a{display:flex;flex-direction:column;gap:.1rem;padding:.7rem .9rem;min-width:9rem;font-weight:600}
.modes-inline a span{font-size:.85rem;color:var(--muted);font-weight:400}
.modes-inline a[aria-current] span{color:inherit;opacity:.85}
.panel{margin-top:1.5rem}
.panel-h{border-top:2px solid var(--line);padding-top:1rem}
.panel-h small{color:var(--muted);font-weight:400;font-size:.85rem;margin-left:.4rem}
body.js .panel[hidden]{display:none}
.notice{border-left:3px solid var(--line);padding:.4rem .8rem;color:var(--muted);font-size:.92rem}
.stmt{padding:.2rem 0 .8rem;border-top:1px solid var(--line)}
.stmt h3{margin-top:1rem}
.stmt.hl{background:var(--hl-bg);border-top-color:transparent;padding:.2rem .9rem .7rem;border-radius:var(--radius);margin-top:.6rem}
.scope{font-size:.9rem;color:var(--muted);border-left:3px solid var(--hl);padding:.2rem .7rem}
.callout{border-left:3px solid var(--accent);padding:.4rem .9rem;margin:.6rem 0;background:var(--panel);border-radius:0 var(--radius-s) var(--radius-s) 0}
body.sl-only .hl{display:none}
.q{border:1px solid var(--line);border-radius:var(--radius);padding:.9rem 1rem;margin:1rem 0;background:var(--panel)}
.q.hl{border-color:var(--hl)}
.stem{margin:0 0 .6rem;font-weight:600}
.stem .n{display:inline-block;min-width:1.6em;color:var(--muted);font-weight:600}
.opts{margin:0;padding-left:1.6rem}
.opts li{margin:.35rem 0}
.opt{font:inherit;text-align:left;width:100%;background:transparent;color:inherit;border:1px solid var(--line);border-radius:var(--radius-s);padding:.5rem .75rem;cursor:pointer}
body.js .opt:hover{border-color:var(--accent)}
.opt.chosen.right{border-color:var(--ok);background:color-mix(in srgb,var(--ok) 10%,transparent)}
.opt.chosen.wrong{border-color:var(--bad);background:color-mix(in srgb,var(--bad) 10%,transparent)}
.opt.reveal{border-color:var(--ok)}
.q.answered .opt{cursor:default}
.answer{margin-top:.7rem}
.answer summary{cursor:pointer;color:var(--muted)}
.answer ol{padding-left:1.6rem}
.answer li{margin:.3rem 0}
.answer li.correct{color:var(--ok)}
.answer li.correct strong{color:var(--ok)}
body.js .q:not(.answered) .answer{display:none}
.actions{margin:1.2rem 0}
.primary{font:inherit;font-weight:600;background:var(--accent);color:var(--accent-fg);border:0;border-radius:var(--radius);padding:.65rem 1.1rem;cursor:pointer}
.result{border:1px solid var(--line);border-radius:var(--radius);padding:1rem;background:var(--panel);margin:1.2rem 0}
.stmt-map{list-style:none;padding:0;margin:0}
.stmt-map li{display:flex;justify-content:space-between;gap:1rem;padding:.35rem 0;border-top:1px solid var(--line)}
.stmt-map a{text-decoration:none}
.mark{font-size:.85rem;font-weight:600;white-space:nowrap}
.mark.own{color:var(--ok)}.mark.notyet{color:var(--bad)}.mark.unasked{color:var(--muted)}
.sendoff{border-top:2px solid var(--line);margin-top:2rem;padding-top:.5rem}
.nextprev{display:flex;justify-content:space-between;gap:1rem;flex-wrap:wrap}
.prose p,.prose li{max-width:40rem}

/* Cool linen: tint and shadow instead of ruled lines */
.top{border-bottom:0;box-shadow:0 1px 0 var(--line)}
.brand{font-weight:600}
h1{font-weight:600;letter-spacing:-.02em}
h1 .code{color:var(--muted);font-weight:500}
.rail{border:0}
@media (min-width:60rem){.rail{border-right:0}}
.rail-toggle{border:0;background:var(--rail)}
.modes-inline a{border:0;background:var(--panel);box-shadow:var(--shadow);border-radius:1rem;padding:.9rem 1.1rem}
.modes-inline a[aria-current]{background:var(--accent)}
.specbox{border:0;background:var(--panel);box-shadow:0 1px 2px rgba(28,37,48,.05)}
.panel-h{border-top:0;margin-top:2.5rem}
.stmt{border-top:0;padding:1.4rem 0 .8rem}
.stmt h3{margin:0 0 .5rem;font-size:1.1rem}
.stmt h3 .code{color:var(--accent);font-weight:600;opacity:.7}
.stmt.hl{background:var(--hl-bg);padding:1.2rem 1.2rem .8rem;border-radius:var(--radius)}
.callout{border:0;background:var(--tint);border-radius:var(--radius);padding:.75rem 1rem}
.scope{border-left:0;background:var(--hl-bg);border-radius:var(--radius);padding:.6rem 1rem}
.q{border:0;box-shadow:var(--shadow)}
.opt{border-color:var(--line);background:color-mix(in srgb,var(--panel) 85%,var(--bg))}
.card{border:0;box-shadow:var(--shadow)}
.card.soon{box-shadow:none;background:var(--rail)}

/* Print: one clean sheet per topic. No PDFs are generated or served; the browser does it. */
@media print{
  :root{--bg:#fff;--fg:#000;--muted:#444;--line:#999;--panel:#fff;--hl-bg:#f3f3f3}
  .top,.rail,.foot,.modes-inline,.actions,.rail-toggle,#print-topic,.result,.skip{display:none!important}
  .frame{display:block;max-width:none;padding:0}
  main{max-width:none;padding:0}
  body{font-size:10.5pt;line-height:1.4}
  h1{font-size:18pt;margin:0 0 .3rem}
  h2.panel-h{font-size:13pt;border-top:1px solid #000;page-break-before:auto}
  body.js .panel[hidden]{display:block!important}
  .panel{margin-top:.8rem}
  .specbox{page-break-inside:avoid}
  .q{page-break-inside:avoid;border:1px solid #bbb;padding:.4rem .6rem;margin:.4rem 0}
  .opt{border:0;padding:0 0 0 .2rem}
  body.js .q:not(.answered) .answer{display:block}
  .answer summary{display:none}
  .answer{font-size:9pt}
  .answer li.correct{font-weight:700}
  .stmt.hl{background:#f3f3f3}
  a{text-decoration:none;color:inherit}
  .nextprev{display:none}
  main::after{content:"dpsciencecafe.com" attr(data-url);display:block;margin-top:1rem;font-size:9pt;color:#444}
}
@media (prefers-color-scheme:dark){.brand img{filter:brightness(0) invert(.92)}}