/* ============================================================
   MARO — Blog ("Margin Notes"). Re-theme of the Forge blog system
   onto Maro's brand: white + cerulean ("the pen"), Newsreader for
   display + body, Geist Mono for labels. One variable set, two skins.
   Linked by the hub (/blog/) and every post.
   ============================================================ */

:root, [data-theme="light"]{
  --bg:#F6F9FB; --bg-2:#EAF1F6; --surface:#FFFFFF; --raised:#FBFDFE;
  --line:#E3EAEF; --line-soft:#EEF3F6; --line-strong:#232B33;
  --ink:#232B33; --ink-2:#5E6B75; --ink-3:#95A1AB;
  --pen:#2D7DBA; --pen-deep:#1F5E8F; --pen-wash:#E7F1F9; --pen-line:#2D7DBA;
  --track:#E6EDF2; --shadow:rgba(31,94,143,.10);
  --invert-bg:#1F5E8F; --invert-fg:#F4F9FC; --invert-em:#BBD8EE; --invert-shadow:rgba(31,94,143,.55);
  --grain-blend:multiply; --grain-opacity:.03;
}
[data-theme="dark"]{
  --bg:#12171C; --bg-2:#0E1318; --surface:#1A2127; --raised:#1E262D;
  --line:#2A333B; --line-soft:#20272E; --line-strong:#EAF0F4;
  --ink:#EAF0F4; --ink-2:#AAB6BF; --ink-3:#7C8893;
  --pen:#5BA3DC; --pen-deep:#8FC4EC; --pen-wash:#14242F; --pen-line:#2D7DBA;
  --track:#222B32; --shadow:rgba(0,0,0,.45);
  --invert-bg:#EAF0F4; --invert-fg:#12171C; --invert-em:#1F5E8F; --invert-shadow:rgba(45,125,186,.5);
  --grain-blend:screen; --grain-opacity:.06;
}
:root{
  --serif:"Newsreader",Georgia,serif;
  --sans:"Newsreader",Georgia,serif;
  --mono:"Geist Mono",ui-monospace,monospace;
  --maxw:1180px;
  --readw:720px;
}

*{box-sizing:border-box;margin:0;padding:0}
html{background:var(--bg);scroll-behavior:smooth}
body{
  background:var(--bg);color:var(--ink);font-family:var(--sans);
  min-height:100vh;position:relative;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
  transition:background .4s ease,color .4s ease;overflow-x:clip;
}
body::before{
  content:"";position:fixed;inset:0;z-index:0;pointer-events:none;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.82' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  opacity:var(--grain-opacity);mix-blend-mode:var(--grain-blend);
}
a{color:inherit;text-decoration:none}
::selection{background:var(--pen-wash);color:var(--ink)}
img{max-width:100%;height:auto;display:block}

.wrap{max-width:var(--maxw);margin:0 auto;padding-inline:clamp(20px,5vw,40px)}

/* ---------- header ---------- */
.site-head{position:relative;z-index:2;background:var(--bg);border-bottom:2.5px solid var(--line-strong)}
.head-inner{max-width:var(--maxw);margin:0 auto;padding:26px clamp(20px,5vw,40px) 18px;
  display:flex;align-items:center;justify-content:space-between;gap:20px}
.brand{font-family:var(--mono);font-size:20px;letter-spacing:.5px;font-weight:500;color:var(--ink);display:flex;align-items:baseline;gap:9px;flex-shrink:0}
.brand .spark{color:var(--pen);font-size:24px;line-height:0}
.brand .ctx{font-family:var(--serif);font-style:italic;font-size:15px;color:var(--ink-2);font-weight:400}
.head-right{display:flex;align-items:center;gap:22px}
.nav{display:flex;gap:20px;font-family:var(--mono);font-size:12px;letter-spacing:.4px;color:var(--ink-3)}
.nav a{color:var(--ink-3);position:relative;padding-bottom:3px;transition:color .15s}
.nav a:hover{color:var(--ink-2)}
.nav a.here{color:var(--pen-deep)}
.signin-link{appearance:none;background:transparent;border:1.5px solid var(--line);border-radius:9px;
  font-family:var(--mono);font-size:12px;letter-spacing:.4px;color:var(--ink-2);padding:8px 16px;
  cursor:pointer;white-space:nowrap;flex-shrink:0;transition:border-color .15s,color .15s,background .15s}
.signin-link:hover{border-color:var(--pen);color:var(--pen-deep)}
.theme-btn{appearance:none;background:transparent;border:1.5px solid var(--line);border-radius:50%;
  width:34px;height:34px;display:grid;place-items:center;cursor:pointer;color:var(--ink-2);font-size:16px;flex-shrink:0;
  transition:border-color .15s,color .15s,transform .15s}
.theme-btn:hover{border-color:var(--pen);color:var(--pen-deep)}
.theme-btn:active{transform:scale(.92)}

/* ---------- shared type bits ---------- */
.eyebrow{font-family:var(--mono);font-size:11px;letter-spacing:1.4px;text-transform:uppercase;color:var(--ink-3);
  display:inline-flex;align-items:center;gap:8px}
.eyebrow::before{content:"";width:6px;height:6px;background:var(--pen);border-radius:1.5px;flex-shrink:0}

/* ---------- buttons ---------- */
.btn{display:inline-flex;align-items:center;gap:10px;font-family:var(--mono);font-weight:500;font-size:14px;
  letter-spacing:.4px;padding:16px 30px;border:none;border-radius:12px;cursor:pointer;line-height:1.1;
  transition:transform .12s,box-shadow .15s,background .15s}
.btn--pen{background:var(--pen);color:#fff;box-shadow:0 0 0 var(--pen-deep)}
.btn--pen:hover{background:#2A72A8;box-shadow:0 3px 0 var(--pen-deep);transform:translateY(-1px)}
.btn--pen:active{transform:translateY(1px);box-shadow:0 0 0 var(--pen-deep)}
.btn .sub{opacity:.7;font-size:15px}
.btn-meta{font-family:var(--mono);font-size:11.5px;letter-spacing:.3px;color:var(--ink-3)}

/* ============================================================
   HUB  (/blog/)
   ============================================================ */
.blog-hero{position:relative;z-index:1;padding-block:clamp(48px,7vw,88px)}
.blog-hero .eyebrow{margin-bottom:18px}
.blog-hero h1{font-family:var(--serif);font-weight:500;font-style:italic;line-height:1.04;letter-spacing:-.5px;
  font-size:clamp(38px,5.2vw,64px);color:var(--ink);margin-bottom:20px;max-width:16ch}
.blog-hero .lead{font-size:clamp(16.5px,1.5vw,20px);color:var(--ink-2);line-height:1.6;max-width:60ch;text-wrap:pretty}

/* ---- series jump-nav ---- */
.series-nav{position:relative;z-index:1;display:flex;flex-wrap:wrap;gap:10px;padding-bottom:clamp(30px,4.5vw,48px)}
.series-nav a{font-family:var(--mono);font-size:12px;letter-spacing:.4px;color:var(--ink-2);
  border:1.5px solid var(--line);border-radius:999px;padding:8px 16px;
  transition:border-color .15s,color .15s,background .15s}
.series-nav a:hover{border-color:var(--pen);color:var(--pen-deep);background:var(--pen-wash)}

/* ---- a series = one titled section of cards ---- */
.series{position:relative;z-index:1;border-top:1.5px solid var(--line);
  padding-top:clamp(40px,5.5vw,64px);padding-bottom:clamp(34px,5vw,56px);scroll-margin-top:20px}
.series:first-of-type{border-top:none;padding-top:0}
.series-head{margin-bottom:26px;max-width:64ch}
.series-head .eyebrow{margin-bottom:14px}
.series-head h2{font-family:var(--serif);font-weight:500;font-style:italic;font-size:clamp(27px,3.6vw,40px);line-height:1.06;
  letter-spacing:-.4px;color:var(--ink);margin-bottom:12px;text-wrap:balance}
.series-head p{font-size:clamp(15px,1.45vw,17.5px);color:var(--ink-2);line-height:1.55;text-wrap:pretty}

.post-list{position:relative;z-index:1;
  display:grid;grid-template-columns:repeat(auto-fill,minmax(330px,1fr));gap:22px}
.series .post-list{padding-bottom:0}
.post-card{background:var(--surface);border:1.5px solid var(--line);border-radius:16px;
  box-shadow:3px 4px 0 var(--shadow);padding:28px 26px 24px;display:flex;flex-direction:column;gap:14px;
  transition:transform .14s,box-shadow .18s,border-color .18s}
.post-card:hover{transform:translateY(-3px);box-shadow:5px 8px 0 var(--shadow);border-color:var(--pen-line)}
.post-card .cat{font-family:var(--mono);font-size:10.5px;letter-spacing:1.2px;text-transform:uppercase;color:var(--pen-deep)}
.post-card h3{font-family:var(--serif);font-weight:500;font-size:clamp(22px,2.4vw,27px);line-height:1.14;
  letter-spacing:-.2px;color:var(--ink);text-wrap:balance}
.post-card p{font-size:15.5px;color:var(--ink-2);line-height:1.55;flex:1;text-wrap:pretty}
.post-card .card-meta{display:flex;align-items:center;gap:10px;font-family:var(--mono);font-size:11px;color:var(--ink-3);letter-spacing:.3px}
.post-card .card-meta .dot{opacity:.5}
.post-card .read{font-family:var(--mono);font-size:12px;letter-spacing:.4px;color:var(--pen-deep);display:inline-flex;align-items:center;gap:7px}
.post-card.feature{grid-column:1/-1;flex-direction:row;gap:32px;align-items:center;padding:34px 34px}
.post-card.feature .feat-body{flex:1;display:flex;flex-direction:column;gap:14px}
.post-card.feature h3{font-size:clamp(26px,3.6vw,40px)}
.post-card.feature .feat-mark{flex-shrink:0;width:128px;height:128px}
@media (max-width:680px){
  .post-card.feature{flex-direction:column;align-items:flex-start}
  .post-card.feature .feat-mark{width:84px;height:84px}
}

/* ============================================================
   POST  (/blog/<slug>)
   ============================================================ */
.post-shell{position:relative;z-index:1;max-width:var(--readw);margin:0 auto;
  padding:clamp(28px,5vw,52px) clamp(20px,5vw,40px) 0}
.crumb{font-family:var(--mono);font-size:11.5px;letter-spacing:.4px;color:var(--ink-3);margin-bottom:30px;display:flex;flex-wrap:wrap;gap:8px;align-items:center}
.crumb a{color:var(--ink-3);transition:color .15s}
.crumb a:hover{color:var(--pen-deep)}
.crumb .sep{opacity:.5}

.post-head{margin-bottom:clamp(30px,4vw,44px)}
.post-head .eyebrow{margin-bottom:18px}
.post-title{font-family:var(--serif);font-weight:500;font-style:italic;line-height:1.05;letter-spacing:-.6px;
  font-size:clamp(33px,5vw,54px);color:var(--ink);margin-bottom:22px;text-wrap:balance}
.post-dek{font-family:var(--sans);font-size:clamp(18px,1.9vw,22px);line-height:1.5;color:var(--ink-2);
  margin-bottom:26px;text-wrap:pretty}
.post-meta{display:flex;flex-wrap:wrap;align-items:center;gap:10px;font-family:var(--mono);font-size:12px;
  letter-spacing:.3px;color:var(--ink-3);border-top:1.5px solid var(--line);padding-top:18px}
.post-meta .dot{opacity:.5}

/* ----- prose ----- */
.post-body{font-family:var(--sans);font-size:19px;line-height:1.72;color:var(--ink)}
.post-body > p{margin-bottom:1.45em;text-wrap:pretty}
.post-body > p:first-of-type::first-letter{
  font-family:var(--serif);font-weight:600;font-size:3.6em;line-height:.78;float:left;
  padding:6px 12px 0 0;color:var(--pen-deep)}
.post-body h2{font-family:var(--serif);font-weight:500;font-style:italic;font-size:clamp(25px,3.2vw,33px);line-height:1.16;
  letter-spacing:-.3px;color:var(--ink);margin:1.9em 0 .6em;text-wrap:balance;scroll-margin-top:24px}
.post-body h2::before{content:"";display:block;width:34px;height:3px;background:var(--pen);border-radius:2px;margin-bottom:18px;opacity:.85}
.post-body h3{font-family:var(--serif);font-weight:600;font-size:clamp(20px,2.4vw,23px);line-height:1.2;
  color:var(--ink);margin:1.6em 0 .5em}
.post-body a{color:var(--pen-deep);text-decoration:underline;text-decoration-thickness:1.5px;
  text-underline-offset:2.5px;text-decoration-color:var(--pen-line);transition:opacity .15s}
.post-body a:hover{opacity:.7}
.post-body strong{font-weight:600;color:var(--ink)}
.post-body em{font-style:italic}
.post-body ul,.post-body ol{margin:0 0 1.45em;padding-left:1.4em}
.post-body li{margin-bottom:.55em;padding-left:.2em;text-wrap:pretty}
.post-body li::marker{color:var(--pen-deep)}
.post-body blockquote{margin:1.6em 0;padding:4px 0 4px 26px;border-left:3px solid var(--pen-line);
  font-family:var(--serif);font-style:italic;font-weight:400;font-size:1.18em;line-height:1.45;color:var(--ink)}
.post-body hr{border:none;border-top:1.5px solid var(--line);margin:2.4em 0}
.post-body code,.post-body .mono{font-family:var(--mono);font-size:.86em;background:var(--bg-2);
  border:1px solid var(--line);border-radius:6px;padding:1px 6px}
.post-body figure{margin:1.8em 0}
.post-body figure img{border:1.5px solid var(--line);border-radius:14px}
.post-body figcaption{font-family:var(--mono);font-size:12px;color:var(--ink-3);margin-top:10px;text-align:center;letter-spacing:.2px}

/* tables (rubric grids, score charts) */
.post-body .table-wrap{overflow-x:auto;margin:1.8em 0;border:1.5px solid var(--line);border-radius:14px}
.post-body table{width:100%;border-collapse:collapse;font-size:16px;min-width:440px}
.post-body th,.post-body td{border-bottom:1.5px solid var(--line);border-right:1.5px solid var(--line);
  padding:12px 16px;text-align:left;vertical-align:top;line-height:1.5;text-wrap:pretty}
.post-body th:last-child,.post-body td:last-child{border-right:none}
.post-body tbody tr:last-child td{border-bottom:none}
.post-body thead th{background:var(--bg-2);font-family:var(--mono);font-size:11.5px;letter-spacing:.6px;
  text-transform:uppercase;color:var(--ink-2);font-weight:500}
.post-body tbody th{font-family:var(--mono);font-size:12px;letter-spacing:.3px;color:var(--pen-deep);
  white-space:nowrap;background:var(--raised)}
.post-body td{color:var(--ink)}

@media (min-width:600px){
  .post-body > p, .post-body .hook p, .post-body .callout p, .post-body details p{
    text-align:justify; text-justify:inter-word; -webkit-hyphens:auto; hyphens:auto;
  }
}

/* front-loaded hook — an opening attention-grabber */
.post-body .hook{background:var(--bg-2);border:1.5px solid var(--line);border-radius:14px;padding:20px 24px;margin:0 0 1.9em}
.post-body .hook .hook-label{font-family:var(--mono);font-size:10.5px;letter-spacing:1.3px;text-transform:uppercase;
  color:var(--pen-deep);margin-bottom:10px}
.post-body .hook p{font-family:var(--serif);font-style:italic;font-weight:400;font-size:1.13em;line-height:1.5;
  color:var(--ink);margin:0;text-align:left}
.post-body .hook p + p{margin-top:.7em}

/* practice / example blocks behind a native <details> */
.post-body .choices{list-style:none;padding-left:0;margin:.5em 0 1.1em}
.post-body .choices li{margin-bottom:.4em;padding-left:0}
.post-body details{border:1.5px solid var(--line);border-radius:12px;background:var(--surface);padding:0 22px;margin:0 0 1.8em}
.post-body details[open]{padding-bottom:18px}
.post-body summary{cursor:pointer;list-style:none;font-family:var(--mono);font-size:11.5px;letter-spacing:.6px;
  text-transform:uppercase;color:var(--pen-deep);padding:15px 0}
.post-body summary::-webkit-details-marker{display:none}
.post-body summary::before{content:"+  "}
.post-body details[open] summary::before{content:"\2013  "}
.post-body details p:first-of-type{margin-top:0}
.post-body details p:last-child{margin-bottom:0}

/* callout — boxed aside for a key insight / the "Maro read" */
.callout{background:var(--surface);border:1.5px solid var(--pen-line);
  border-radius:14px;box-shadow:3px 4px 0 var(--shadow);padding:24px 26px;margin:1.9em 0}
.callout .callout-label{font-family:var(--mono);font-size:10.5px;letter-spacing:1.3px;text-transform:uppercase;
  color:var(--pen-deep);margin-bottom:10px}
.callout p{font-size:17.5px;line-height:1.6;color:var(--ink);margin:0}
.callout p + p{margin-top:.8em}

/* ----- in-post CTA band ----- */
.post-cta{position:relative;z-index:1;max-width:var(--readw);margin:clamp(44px,6vw,72px) auto 0;
  padding:0 clamp(20px,5vw,40px)}
.post-cta-inner{background:var(--invert-bg);border-radius:18px;padding:clamp(32px,4.5vw,48px);
  text-align:center;box-shadow:5px 6px 0 var(--invert-shadow);display:flex;flex-direction:column;align-items:center;gap:20px}
.post-cta-inner h2{font-family:var(--serif);font-weight:500;font-style:italic;font-size:clamp(24px,3.4vw,36px);line-height:1.12;
  color:var(--invert-fg);max-width:24ch;text-wrap:balance}
.post-cta-inner .btn--paper{background:var(--invert-fg);color:var(--invert-bg);box-shadow:none}
.post-cta-inner .btn--paper:hover{transform:translateY(-1px);opacity:.94}
.post-cta-inner .btn-meta{color:var(--invert-fg);opacity:.7}

/* ----- post footer nav / related ----- */
.post-foot{position:relative;z-index:1;max-width:var(--readw);margin:clamp(44px,6vw,72px) auto 0;
  padding:0 clamp(20px,5vw,40px)}
.post-foot .ph{font-family:var(--mono);font-size:11px;letter-spacing:1.3px;text-transform:uppercase;color:var(--ink-3);
  border-top:1.5px solid var(--line);padding-top:24px;margin-bottom:18px}
.related{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.related a{background:var(--surface);border:1.5px solid var(--line);border-radius:14px;padding:20px 22px;
  display:flex;flex-direction:column;gap:8px;transition:border-color .15s,transform .14s}
.related a:hover{border-color:var(--pen-line);transform:translateY(-2px)}
.related .cat{font-family:var(--mono);font-size:10px;letter-spacing:1.1px;text-transform:uppercase;color:var(--pen-deep)}
.related .rt{font-family:var(--serif);font-size:19px;line-height:1.22;color:var(--ink);text-wrap:balance}
.back-to-blog{display:inline-flex;align-items:center;gap:8px;font-family:var(--mono);font-size:12.5px;
  letter-spacing:.3px;color:var(--pen-deep);margin-top:26px}
@media (max-width:560px){.related{grid-template-columns:1fr}}

/* ---------- footer ---------- */
.site-foot{background:var(--bg-2);border-top:1.5px solid var(--line);position:relative;z-index:1;
  padding-block:clamp(48px,7vw,82px);margin-top:clamp(56px,8vw,104px)}
.foot-inner{max-width:var(--maxw);margin:0 auto;padding-inline:clamp(20px,5vw,40px);
  display:grid;grid-template-columns:1.2fr .8fr;gap:clamp(32px,6vw,64px)}
.foot-brand .brand{font-size:26px;margin-bottom:16px}
.foot-statement{font-size:17px;color:var(--ink-2);margin-bottom:26px;max-width:30ch;line-height:1.5}
.foot-meta{display:flex;flex-direction:column;gap:20px;align-items:flex-start;justify-content:flex-end}
.foot-links{display:flex;flex-wrap:wrap;gap:20px}
.foot-links a{font-family:var(--mono);font-size:12.5px;letter-spacing:.3px;color:var(--ink-3);transition:color .15s}
.foot-links a:hover{color:var(--ink)}
.foot-fine{display:flex;gap:10px;align-items:center;font-family:var(--mono);font-size:12px;color:var(--ink-3);flex-wrap:wrap}
.foot-fine a:hover{color:var(--ink)}
.foot-copy{font-family:var(--mono);font-size:11.5px;color:var(--ink-3);letter-spacing:.3px}

@media (max-width:900px){
  .foot-inner{grid-template-columns:1fr}
  .nav{display:none}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  body,.post-card{transition:none}
}