/* Plus Jakarta Sans (SIL Open Font License), self-hosted in fonts/: no request to a font service */
@font-face{font-family:"Plus Jakarta Sans";font-style:normal;font-weight:400 800;font-display:swap;src:url(../fonts/plus-jakarta-sans-latin-ext.woff2) format("woff2");unicode-range:U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C4,U+2113,U+2C60-2C7F,U+A720-A7FF}
@font-face{font-family:"Plus Jakarta Sans";font-style:normal;font-weight:400 800;font-display:swap;src:url(../fonts/plus-jakarta-sans-latin.woff2) format("woff2");unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
/* Blog: same tokens as the intro page (index.html) and the app (style.css) */
:root{
  --bg:#f7f5f0; --surface:#fff; --surface-2:#f0ede6; --ink:#1d1b18; --muted:#6b665d; --line:#e3ded3;
  --accent:#1f4e8c; --accent-ink:#fff; --ok:#2f7d4f;
  --A1:#2f7d4f; --A2:#167a7a; --B1:#1f5fa8; --B2:#6a43a8; --C1:#a8355f;
  --shadow:0 1px 2px rgba(0,0,0,.04),0 10px 30px rgba(0,0,0,.07); --radius:16px; color-scheme:light;
}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){
  --bg:#14161a; --surface:#1c1f25; --surface-2:#252932; --ink:#e9e6df; --muted:#9a968d; --line:#2f343e;
  --accent:#7fb0f0; --accent-ink:#0d1420; --ok:#5cc086;
  --A1:#5cc086; --A2:#4cc4c4; --B1:#7fb0f0; --B2:#b394ee; --C1:#ee8fb3; --shadow:none; color-scheme:dark}}
:root[data-theme="dark"]{
  --bg:#14161a; --surface:#1c1f25; --surface-2:#252932; --ink:#e9e6df; --muted:#9a968d; --line:#2f343e;
  --accent:#7fb0f0; --accent-ink:#0d1420; --ok:#5cc086;
  --A1:#5cc086; --A2:#4cc4c4; --B1:#7fb0f0; --B2:#b394ee; --C1:#ee8fb3; --shadow:none; color-scheme:dark}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:80px}
body{margin:0;background:var(--bg);color:var(--ink);font:17px/1.7 "Plus Jakarta Sans",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif}
.wrap{max-width:1080px;margin:0 auto;padding:0 20px}
h1,h2,h3{font-family:inherit;line-height:1.2;letter-spacing:-.01em}
.num{font:inherit}
a{color:var(--accent)}
a:focus-visible,.btn:focus-visible{outline:2px solid var(--accent);outline-offset:3px}
.muted{color:var(--muted)}

/* top bar */
.top{position:sticky;top:0;z-index:10;background:color-mix(in srgb,var(--bg) 85%,transparent);backdrop-filter:saturate(1.4) blur(12px);-webkit-backdrop-filter:saturate(1.4) blur(12px);border-bottom:1px solid var(--line)}
.top-in{display:flex;align-items:center;gap:16px;height:64px}
.brand{display:flex;align-items:center;gap:10px;color:var(--ink);text-decoration:none;font-weight:700;font-size:15px}
.logo{width:34px;height:34px;border-radius:9px;background:#1f4e8c url(../icons/icon.svg) center/cover no-repeat;flex:none}
.top nav{display:flex;align-items:center;gap:6px;margin-left:auto}
.top nav a:not(.btn){color:var(--muted);text-decoration:none;font-size:15px;font-weight:500;padding:6px 10px;border-radius:8px}
.top nav a:not(.btn):hover,.top nav a[aria-current]{color:var(--ink);background:var(--surface-2)}
.btn{display:inline-flex;align-items:center;justify-content:center;height:44px;padding:0 20px;border-radius:12px;font-weight:600;font-size:15.5px;text-decoration:none;border:1px solid transparent;line-height:1}
.btn.primary{background:var(--accent);color:var(--accent-ink)}
.btn.ghost{background:var(--surface);color:var(--ink);border-color:var(--line)}
.top .btn{height:40px;padding:0 16px;font-size:14.5px}

/* blog index */
.b-head{padding:56px 0 28px;max-width:720px}
.b-head h1{font-size:clamp(34px,4.6vw,48px);margin:8px 0 12px}
.b-head p{color:var(--muted);font-size:18px;margin:0}
.eyebrow{display:inline-block;font-size:13px;font-weight:700;letter-spacing:.06em;text-transform:uppercase;color:var(--accent)}
.posts{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;padding-bottom:24px}
.post-card{display:flex;flex-direction:column;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:22px;text-decoration:none;color:var(--ink);transition:transform .15s,border-color .15s}
.post-card:hover{transform:translateY(-2px);border-color:color-mix(in srgb,var(--accent) 40%,var(--line))}
.post-card .tag{align-self:flex-start;font-size:12.5px;font-weight:600;color:var(--accent);background:color-mix(in srgb,var(--accent) 11%,transparent);padding:3px 10px;border-radius:999px;margin-bottom:14px}
.post-card{position:relative}
.post-card :is(h2,h3){font-size:21px;margin:0 0 8px}
/* the title link covers the whole card, so the link text stays short */
.post-card :is(h2,h3) a{color:inherit;text-decoration:none}
.post-card :is(h2,h3) a::after{content:"";position:absolute;inset:0;border-radius:inherit}
.post-card:focus-within{outline:2px solid var(--accent);outline-offset:3px}
.post-card :is(h2,h3) a:focus-visible{outline:none}
.post-card p{color:var(--muted);font-size:15.5px;margin:0 0 16px;line-height:1.6}
.post-card .meta{margin-top:auto;font-size:13.5px;color:var(--muted)}

/* article */
.crumbs{font-size:14px;color:var(--muted);padding-top:28px}
.crumbs a{color:var(--muted)}
.post{max-width:720px;margin:0 auto;padding-bottom:16px}
.post header{padding:12px 0 8px}
.post h1{font-size:clamp(32px,4.4vw,46px);margin:10px 0 14px}
.post .meta{font-size:14.5px;color:var(--muted)}
.post header .meta{margin-bottom:6px}
.post .byline{font-size:14.5px;color:var(--muted);margin:0}
.post .byline a{color:var(--ink);font-weight:600}
.post .lead{font-size:19.5px;color:var(--ink);opacity:.9;margin:36px 0 32px}
.post h2{font-size:clamp(25px,3vw,30px);margin:80px 0 24px}
.post h3{font-size:21px;margin:52px 0 16px}
.post p{margin:0 0 24px}
.post li{margin:0 0 12px}
.post ul,.post ol{padding-left:22px;margin:0 0 32px}
.post li::marker{color:var(--muted)}
.post strong{font-weight:650}
.toc{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:16px 20px;margin:36px 0 16px;font-size:15.5px}
.toc b{display:block;margin-bottom:6px}
.toc ol{margin:0;padding-left:20px}
.toc li{margin:3px 0}
.toc a{text-decoration:none}
.ex{background:var(--surface);border-left:3px solid var(--accent);border-radius:8px;padding:16px 20px;margin:32px 0 36px;font-size:16px}
.ex span{display:block}
.ex .tr{color:var(--muted);font-size:15px}
.note{background:var(--surface-2);border-radius:12px;padding:18px 22px;margin:32px 0 36px;font-size:16px}
.tbl{width:100%;border-collapse:collapse;margin:32px 0 40px;font-size:15.5px;background:var(--surface);border:1px solid var(--line);border-radius:12px;overflow:hidden;display:block;overflow-x:auto}
.tbl table{width:100%;border-collapse:collapse;min-width:520px}
.tbl th,.tbl td{text-align:left;padding:10px 14px;border-bottom:1px solid var(--line);vertical-align:top}
.tbl tr:last-child td{border-bottom:0}
.tbl th{font-size:14px;color:var(--muted);font-weight:600;background:var(--surface-2)}
.lv{display:inline-block;padding:1px 9px;border-radius:999px;font-size:12.5px;font-weight:700;color:var(--surface);white-space:nowrap}
.lv.A1{background:var(--A1)}.lv.A2{background:var(--A2)}.lv.B1{background:var(--B1)}.lv.B2{background:var(--B2)}.lv.C1{background:var(--C1)}
.cta{display:flex;flex-wrap:wrap;align-items:center;gap:14px 20px;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:24px 26px;margin:56px 0}
.cta div{flex:1 1 260px}
.cta b{display:block;font-size:17.5px;margin-bottom:2px}
.cta span{color:var(--muted);font-size:15.5px}
/* answer-first box (featured snippet / AI answer), key takeaways, definitions, sources */
.answer{background:color-mix(in srgb,var(--accent) 8%,var(--surface));border:1px solid color-mix(in srgb,var(--accent) 28%,var(--line));border-radius:var(--radius);padding:22px 26px;margin:36px 0 12px}
.answer b{display:block;font-size:13px;font-weight:700;letter-spacing:.06em;text-transform:uppercase;color:var(--accent);margin-bottom:6px}
.answer p{margin:0;font-size:18px;line-height:1.65}
.takeaways{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:20px 24px 8px;margin:36px 0 16px}
.takeaways b{display:block;margin-bottom:8px}
.takeaways ul{margin:0 0 12px}
.def{border-left:3px solid var(--muted);padding:6px 0 6px 20px;margin:32px 0 36px}
.def dfn{font-style:normal;font-weight:700}
.sources{font-size:15px;color:var(--muted)}
.sources li{margin:0 0 8px}
.sources cite{font-style:italic}
.editorial{font-size:14.5px;color:var(--muted);border-top:1px solid var(--line);margin-top:64px;padding-top:24px}
/* figures: charts drawn from the post's own calculations */
.fig{margin:32px 0 36px}
.fig img{display:block;width:100%;height:auto;border:1px solid var(--line);border-radius:16px}
.fig figcaption{font-size:14.5px;color:var(--muted);margin-top:12px;line-height:1.55}
/* a box right after a heading needs no extra top gap */
.post :is(h2,h3)+:is(.def,.tbl,.ex,.note,.fig){margin-top:0}
.related{max-width:720px;margin:56px auto 0;border-top:1px solid var(--line);padding-top:28px}
.related h2{font-size:24px;margin:0 0 14px}
.related .posts{grid-template-columns:repeat(2,minmax(0,1fr))}

footer{max-width:1080px;margin:56px auto 0;padding:28px 20px 44px;color:var(--muted);font-size:14px;display:flex;flex-wrap:wrap;gap:8px 20px;justify-content:space-between;border-top:1px solid var(--line)}
footer a{color:var(--muted)}

@media (max-width:900px){.posts{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (max-width:640px){
  body{font-size:16.5px}
  .wrap{padding:0 16px}
  .posts,.related .posts{grid-template-columns:1fr}
  .top nav a:not(.btn):not(.keep){display:none}
  .long{display:none}
  .top-in{gap:10px}
  .top .btn{padding:0 12px}
  .post .lead{font-size:18px}
  footer{padding:24px 16px 40px}
}
@media (min-width:641px){.short{display:none}}
.brand span,.btn{white-space:nowrap}