/* ===================================================================
   PhD Monitor — Blog
   Quest v2 design system, authored as plain CSS for static, SEO-friendly,
   near-zero-JS server-rendered pages. Tokens mirror the app's vocabulary.
   Light/dark via html.dark; RTL/Persian via html[lang="fa"] / html[dir="rtl"].
   =================================================================== */

/* ---------- Tokens: light (default) ---------- */
:root {
  --bg0:#f8f2e6; --bg1:#ffffff; --bg2:#f0e7d5; --bg3:#ebdfc7;
  --ink:#1d1410; --ink1:#4a3a30; --ink2:#6a5c52; --ink3:#9e8f83;
  --line:#e6d9c2; --lineHi:#cdb999;

  --teal:#107059; --tealDk:#0a5742; --tealLt:#d4ede5;
  --terra:#d96a4c; --terraDk:#b8503a; --terraLt:#fbe2d8;
  --honey:#deA01c; --honeyDk:#b87f10; --honeyLt:#fbecc8;
  --plum:#7b5cb9; --plumDk:#5e44a0; --plumLt:#ebe2f5;
  --sky:#3d9bd1; --skyDk:#2b7da9; --skyLt:#d8ecf7;

  --card-shadow:0 2px 12px rgba(29,20,16,0.06);
  --card-shadow-hi:0 14px 40px -12px rgba(29,20,16,0.18);

  --font-sans:'Nunito',system-ui,-apple-system,sans-serif;
  --font-display:'Bricolage Grotesque','Nunito',system-ui,sans-serif;
  --font-mono:'JetBrains Mono','Courier New',monospace;

  --measure:68ch;
  color-scheme:light;
}

/* ---------- Tokens: dark ---------- */
html.dark {
  --bg0:#0d1020; --bg1:#131828; --bg2:#182030; --bg3:#202840;
  --ink:#f0eeff; --ink1:#a8a6d8; --ink2:#6b6a9e; --ink3:#42426a;
  --line:rgba(255,255,255,0.07); --lineHi:rgba(255,255,255,0.14);

  --teal:#2dd4a7; --tealDk:#1aaa85; --tealLt:rgba(45,212,167,0.16);
  --terra:#ff7a6b; --terraDk:#e85a4d; --terraLt:rgba(255,122,107,0.16);
  --honey:#ffc857; --honeyDk:#e8a820; --honeyLt:rgba(255,200,87,0.16);
  --plum:#a07de0; --plumDk:#7b5cb9; --plumLt:rgba(160,125,224,0.16);
  --sky:#7adef7; --skyDk:#3db8d8; --skyLt:rgba(122,222,247,0.16);

  --card-shadow:0 2px 16px rgba(0,0,0,0.40);
  --card-shadow-hi:0 18px 48px -12px rgba(0,0,0,0.6);
  color-scheme:dark;
}

/* ---------- Persian / RTL ---------- */
html[lang="fa"] {
  --font-sans:'Vazirmatn',system-ui,sans-serif;
  --font-display:'Vazirmatn',system-ui,sans-serif;
}

*{box-sizing:border-box;border-color:var(--line);}
html{ -webkit-text-size-adjust:100%; scroll-behavior:smooth; }
body{
  margin:0;
  background:var(--bg0);
  color:var(--ink);
  font-family:var(--font-sans);
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  transition:background-color .3s,color .3s;
}
h1,h2,h3,h4,h5,.font-display{
  font-family:var(--font-display);
  letter-spacing:-0.02em;
  line-height:1.08;
  font-weight:800;
  margin:0;
}
html[lang="fa"] h1,html[lang="fa"] h2,html[lang="fa"] h3,html[lang="fa"] h4{ letter-spacing:0; }
a{color:inherit;text-decoration:none;}
img{max-width:100%;display:block;}
:focus-visible{outline:3px solid color-mix(in srgb,var(--teal) 45%,transparent);outline-offset:2px;border-radius:6px;}

/* ---------- Layout primitives ---------- */
.wrap{max-width:1120px;margin:0 auto;padding:0 24px;}
.wrap-reading{max-width:760px;margin:0 auto;padding:0 24px;}
.section{padding:56px 0;}
.eyebrow{
  font-family:var(--font-display);
  font-size:12.5px;font-weight:800;letter-spacing:.14em;text-transform:uppercase;
  color:var(--teal);display:inline-flex;align-items:center;gap:8px;
}
html[lang="fa"] .eyebrow{letter-spacing:0;}
.muted{color:var(--ink2);}
.lede{color:var(--ink2);font-size:18px;font-weight:600;line-height:1.55;max-width:54ch;margin:14px 0 0;}
.divider{height:1px;background:var(--line);border:0;margin:0;}

/* ---------- Cards ---------- */
.card{
  background:var(--bg1);
  border:2px solid var(--lineHi);
  border-bottom-width:3px;
  border-radius:20px;
  box-shadow:var(--card-shadow);
  transition:transform .18s ease,box-shadow .25s ease,border-color .25s;
}
a.card:hover,.card.hoverable:hover{
  transform:translateY(-3px);
  box-shadow:var(--card-shadow-hi);
  border-color:var(--teal);
}

/* ---------- Pills / tags ---------- */
.tag{
  display:inline-flex;align-items:center;gap:6px;
  font-family:var(--font-display);
  font-size:12px;font-weight:800;letter-spacing:.02em;
  padding:5px 12px;border-radius:999px;border:1.5px solid transparent;
  white-space:nowrap;
}
.tag-teal {background:var(--tealLt); color:var(--tealDk); border-color:color-mix(in srgb,var(--teal) 22%,transparent);}
.tag-terra{background:var(--terraLt);color:var(--terraDk);border-color:color-mix(in srgb,var(--terra) 26%,transparent);}
.tag-honey{background:var(--honeyLt);color:var(--honeyDk);border-color:color-mix(in srgb,var(--honey) 30%,transparent);}
.tag-plum {background:var(--plumLt); color:var(--plumDk); border-color:color-mix(in srgb,var(--plum) 24%,transparent);}
.tag-sky  {background:var(--skyLt);  color:var(--skyDk);  border-color:color-mix(in srgb,var(--sky) 26%,transparent);}
.tag-ink  {background:var(--bg2);    color:var(--ink2);   border-color:var(--line);}

/* ---------- 3D pill button ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  font-family:var(--font-display);
  font-weight:800;line-height:1;cursor:pointer;
  border-style:solid;border-width:2px;border-bottom-width:4px;
  border-radius:14px;padding:13px 22px;font-size:14.5px;
  transition:transform .08s ease,box-shadow .2s ease,background .2s;
  text-decoration:none;
}
.btn:hover{transform:translateY(1px);}
.btn:active{transform:translateY(2px);border-bottom-width:2px;}
.btn-lg{padding:16px 28px;font-size:16px;border-radius:16px;}
.btn-sm{padding:9px 16px;font-size:13px;border-radius:11px;border-bottom-width:3px;}
.btn-teal {background:var(--teal); color:#fff; border-color:var(--tealDk);}
.btn-honey{background:var(--honey);color:#1d1410;border-color:var(--honeyDk);}
.btn-white{background:var(--bg1); color:var(--ink);border-color:var(--lineHi);}
.btn-plum {background:var(--plum); color:#fff; border-color:var(--plumDk);}

/* link with arrow */
.link-arrow{
  display:inline-flex;align-items:center;gap:7px;
  font-family:var(--font-display);font-weight:800;font-size:14px;color:var(--teal);
}
.link-arrow svg{transition:transform .2s;}
.link-arrow:hover svg{transform:translateX(3px);}
html[dir="rtl"] .link-arrow svg{transform:scaleX(-1);}
html[dir="rtl"] .link-arrow:hover svg{transform:scaleX(-1) translateX(3px);}
html[dir="rtl"] .rtl-flip{transform:scaleX(-1);}

/* ---------- Cover placeholders (palette-tinted, no external images) ---------- */
.cover{
  position:relative;width:100%;border-radius:16px;overflow:hidden;
  background:var(--bg2);isolation:isolate;
}
.cover-stripes{
  background-image:repeating-linear-gradient(135deg,
    color-mix(in srgb,var(--c1,var(--teal)) 16%,var(--bg2)) 0 14px,
    color-mix(in srgb,var(--c1,var(--teal)) 7%,var(--bg2)) 14px 28px);
}
.cover-glow{
  background:
    radial-gradient(120% 120% at 18% 12%, color-mix(in srgb,var(--c1,var(--teal)) 34%,var(--bg2)), transparent 60%),
    radial-gradient(120% 120% at 88% 92%, color-mix(in srgb,var(--c2,var(--honey)) 30%,var(--bg2)), transparent 62%),
    var(--bg2);
}
.cover-img{background-size:cover;background-position:center;}
.cover-emblem{position:absolute;inset:0;display:grid;place-items:center;opacity:.85;}
.cover-num{
  position:absolute;inset-block-start:12px;inset-inline-start:14px;
  font-family:var(--font-display);font-weight:800;font-size:13px;color:#fff;
  background:var(--teal);border:2px solid var(--tealDk);border-radius:999px;padding:3px 11px;
}

/* ---------- Header chrome ---------- */
.site-header{
  position:sticky;top:0;z-index:40;
  background:color-mix(in srgb,var(--bg0) 86%,transparent);
  backdrop-filter:blur(12px) saturate(1.2);
  border-bottom:1px solid var(--line);
}
.site-header .bar{
  display:flex;align-items:center;justify-content:space-between;gap:18px;height:68px;
}
.brand{display:inline-flex;align-items:center;gap:11px;}
.brand .name{font-family:var(--font-display);font-weight:800;font-size:19px;letter-spacing:-0.02em;}
.brand .name b{color:var(--teal);}
.nav{display:flex;align-items:center;gap:18px;}
.nav-links{display:flex;align-items:center;gap:22px;}
.nav-links a{font-weight:800;font-size:14px;color:var(--ink1);transition:color .15s;}
.nav-links a:hover,.nav-links a[aria-current]{color:var(--teal);}
@media(max-width:860px){.nav-links{display:none;}}

.icon-btn{
  width:38px;height:38px;flex:none;display:grid;place-items:center;cursor:pointer;
  background:var(--bg1);color:var(--ink1);
  border:2px solid var(--lineHi);border-bottom-width:3px;border-radius:11px;
  transition:transform .08s ease,border-color .2s,color .2s;
}
.icon-btn:hover{border-color:var(--teal);color:var(--teal);}
.icon-btn:active{transform:translateY(1px);}
.theme-toggle .moon{display:none;}
html.dark .theme-toggle .sun{display:none;}
html.dark .theme-toggle .moon{display:block;}
.lang-switch{
  font-family:var(--font-display);font-weight:800;font-size:13px;color:var(--ink1);
  border:2px solid var(--lineHi);border-bottom-width:3px;border-radius:11px;
  padding:8px 13px;background:var(--bg1);transition:border-color .2s,color .2s;
}
.lang-switch:hover{border-color:var(--teal);color:var(--teal);}

/* ---------- Footer ---------- */
.site-footer{
  border-top:1px solid var(--line);
  background:var(--bg1);
  padding:48px 0 40px;
  margin-top:40px;
}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:32px;}
@media(max-width:760px){.footer-grid{grid-template-columns:1fr 1fr;gap:28px;}}
.footer-grid h4{font-size:13px;text-transform:uppercase;letter-spacing:.1em;color:var(--ink3);margin:0 0 14px;}
html[lang="fa"] .footer-grid h4{letter-spacing:0;}
.footer-grid a{display:block;color:var(--ink1);font-weight:600;font-size:14px;padding:5px 0;}
.footer-grid a:hover{color:var(--teal);}
.footer-grid p{color:var(--ink2);font-size:13.5px;font-weight:600;max-width:30ch;margin:0;}

/* ---------- Byline / meta ---------- */
.byline{display:flex;align-items:center;gap:12px;}
.avatar{
  width:42px;height:42px;border-radius:999px;flex:none;
  display:grid;place-items:center;background:var(--teal);
  font-family:var(--font-display);font-weight:800;font-size:16px;color:#fff;
  border:2px solid color-mix(in srgb,var(--ink) 12%,transparent);
}
.avatar-sm{width:30px;height:30px;font-size:12px;}
.meta-row{display:flex;align-items:center;gap:8px;flex-wrap:wrap;color:var(--ink2);font-size:13.5px;font-weight:600;}
.meta-row .dot{width:3px;height:3px;border-radius:999px;background:var(--ink3);flex:none;}

/* ---------- Hero ---------- */
.blog-hero h1{font-size:clamp(34px,5vw,52px);max-width:18ch;margin:12px 0 0;}

/* ---------- Featured ---------- */
.featured{display:grid;grid-template-columns:1.05fr .95fr;gap:0;overflow:hidden;}
.featured .featured-cover{min-height:340px;border-radius:0;}
.featured .featured-body{padding:34px 38px;display:flex;flex-direction:column;justify-content:center;gap:16px;}
.featured .featured-body h2{font-size:clamp(26px,3.2vw,36px);color:var(--ink);max-width:18ch;}
.featured .featured-body p{color:var(--ink2);font-size:16px;font-weight:500;max-width:42ch;margin:0;}
@media(max-width:760px){.featured{grid-template-columns:1fr;}.featured .featured-cover{min-height:200px;}}

/* ---------- Category / pillar filters ---------- */
.cat-filter{display:flex;gap:10px;flex-wrap:wrap;align-items:center;}
.cat-filter .tag{padding:8px 16px;font-size:13px;}

/* ---------- Grids ---------- */
.post-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;}
@media(max-width:920px){.post-grid{grid-template-columns:repeat(2,1fr);}}
@media(max-width:600px){.post-grid{grid-template-columns:1fr;}}

.post-card{display:flex;flex-direction:column;overflow:hidden;}
.post-card .pc-cover{height:170px;border-radius:0;position:relative;}
.post-card .pc-body{padding:18px 20px 22px;display:flex;flex-direction:column;gap:11px;flex:1;}
.post-card h3{font-size:19.5px;color:var(--ink);line-height:1.2;}
.post-card .excerpt{color:var(--ink2);font-size:14.5px;font-weight:500;line-height:1.55;margin:0;}
.post-card .pc-foot{margin-top:auto;padding-top:6px;}

/* ---------- Breadcrumbs ---------- */
.crumbs{display:flex;align-items:center;gap:8px;flex-wrap:wrap;font-size:13px;color:var(--ink2);font-weight:700;margin-bottom:20px;}
.crumbs a{color:var(--ink2);}
.crumbs a:hover{color:var(--teal);}
.crumbs .here{color:var(--teal);font-weight:800;}

/* ---------- Article ---------- */
.article-head h1{font-size:clamp(32px,5vw,48px);max-width:20ch;}
.article-head .subtitle{color:var(--ink2);font-size:20px;font-weight:600;margin:18px 0 0;max-width:54ch;line-height:1.5;}
.article-cover{margin:0 auto;max-width:1000px;}
.article-cover .cover{aspect-ratio:16/8;min-height:280px;}
.article-cover img{width:100%;height:auto;border-radius:16px;}
.article-layout{display:grid;grid-template-columns:230px 1fr;gap:54px;align-items:start;}
@media(max-width:880px){.article-layout{grid-template-columns:1fr;gap:24px;}.article-layout .toc{display:none;}}

/* author + CTA cards */
.author-card{padding:26px 28px;display:flex;gap:18px;align-items:center;flex-wrap:wrap;}
.author-card .avatar{width:56px;height:56px;font-size:20px;}
.author-card .who{flex:1;min-width:200px;}
.author-card .who strong{font-family:var(--font-display);font-size:17px;color:var(--ink);}
.author-card .who p{margin:4px 0 0;font-size:14px;font-weight:600;color:var(--ink2);}
.hub-links{margin-top:24px;display:flex;flex-wrap:wrap;align-items:center;gap:8px;}
.hub-links-label{font-family:var(--font-display);font-weight:800;font-size:13px;color:var(--ink2);}
.hub-links .tag{background:var(--bg2);color:var(--ink1);border-color:var(--line);text-decoration:none;transition:border-color .15s,color .15s;}
.hub-links .tag:hover{border-color:var(--teal);color:var(--ink);}
.article-cta{
  margin-top:20px;background:linear-gradient(135deg,var(--plum),var(--plumDk));
  border:2px solid var(--plumDk);border-bottom-width:3px;border-radius:20px;color:#fff;
  padding:30px 32px;display:flex;align-items:center;justify-content:space-between;gap:22px;flex-wrap:wrap;
}
.article-cta h3{color:#fff;font-size:22px;margin:0 0 6px;}
.article-cta p{margin:0;color:rgba(255,255,255,.85);font-weight:600;font-size:14.5px;max-width:46ch;}

/* big teal CTA band */
.cta-band{
  background:linear-gradient(135deg,var(--teal),var(--tealDk));border-color:var(--tealDk);
  color:#fff;border-radius:24px;padding:44px 40px;
  display:flex;align-items:center;justify-content:space-between;gap:30px;flex-wrap:wrap;
}
.cta-band h2{color:#fff;font-size:26px;margin:0 0 6px;}
.cta-band p{margin:0;color:rgba(255,255,255,.85);font-weight:600;font-size:15px;max-width:48ch;}

.empty{color:var(--ink2);font-weight:600;text-align:center;padding:40px 0;}

/* ---------- Prose (article body) ---------- */
.prose{font-size:18.5px;line-height:1.78;color:var(--ink1);max-width:var(--measure);}
html[lang="fa"] .prose{line-height:2.05;font-size:18px;}
.prose > * + *{margin-top:1.35em;}
.prose h2{font-size:30px;color:var(--ink);margin-top:2.1em;line-height:1.15;scroll-margin-top:90px;}
.prose h3{font-size:22px;color:var(--ink);margin-top:1.7em;scroll-margin-top:90px;}
.prose p{text-wrap:pretty;}
.prose strong{color:var(--ink);font-weight:800;}
.prose a{color:var(--teal);text-decoration:underline;text-underline-offset:3px;text-decoration-thickness:2px;text-decoration-color:color-mix(in srgb,var(--teal) 40%,transparent);}
.prose a:hover{text-decoration-color:var(--teal);}
.prose ul,.prose ol{padding-inline-start:1.4em;}
.prose li{margin-top:.5em;}
.prose li::marker{color:var(--teal);font-weight:800;}
.prose blockquote{
  margin:1.8em 0;padding:4px 0 4px 22px;border-inline-start:4px solid var(--teal);
  font-family:var(--font-display);font-weight:600;font-size:21px;line-height:1.4;color:var(--ink);font-style:normal;
}
html[dir="rtl"] .prose blockquote{padding:4px 22px 4px 0;}
.prose code{
  font-family:var(--font-mono);font-size:.86em;background:var(--bg2);border:1px solid var(--line);
  padding:2px 6px;border-radius:6px;color:var(--terraDk);
}
.prose pre{
  background:var(--bg2);border:2px solid var(--line);border-bottom-width:3px;border-radius:14px;
  padding:18px 20px;overflow:auto;font-size:14px;line-height:1.6;direction:ltr;text-align:left;
}
.prose pre code{background:none;border:0;padding:0;color:var(--ink1);font-size:14px;}
.prose figure{margin:2em 0;}
.prose figure figcaption{margin-top:10px;font-size:13.5px;color:var(--ink2);text-align:center;font-weight:600;}
.prose img{border-radius:14px;margin:0 auto;}
.prose hr{border:0;height:1px;background:var(--line);margin:2.4em 0;}
.prose table{width:100%;border-collapse:collapse;font-size:15px;}
.prose th,.prose td{border:1px solid var(--line);padding:8px 12px;text-align:start;}
.prose th{background:var(--bg2);font-family:var(--font-display);}

/* ---------- Callout ---------- */
.callout{
  display:flex;gap:14px;align-items:flex-start;
  background:var(--tealLt);border:2px solid color-mix(in srgb,var(--teal) 24%,transparent);
  border-radius:16px;padding:18px 20px;margin:2em 0;font-size:16px;line-height:1.6;color:var(--ink);
}
.callout.honey{background:var(--honeyLt);border-color:color-mix(in srgb,var(--honey) 34%,transparent);}
.callout.terra{background:var(--terraLt);border-color:color-mix(in srgb,var(--terra) 30%,transparent);}
.callout p{margin:0;}

/* ---------- Table of contents ---------- */
.toc{position:sticky;top:90px;font-size:13.5px;}
.toc .toc-title{font-family:var(--font-display);font-weight:800;font-size:12px;letter-spacing:.12em;text-transform:uppercase;color:var(--ink3);margin:0 0 14px;}
html[lang="fa"] .toc .toc-title{letter-spacing:0;}
.toc ul{list-style:none;margin:0;padding:0;border-inline-start:2px solid var(--line);}
.toc li a{
  display:block;padding:7px 0 7px 16px;color:var(--ink2);font-weight:700;
  border-inline-start:2px solid transparent;margin-inline-start:-2px;transition:color .15s,border-color .15s;
}
html[dir="rtl"] .toc li a{padding:7px 16px 7px 0;}
.toc li a:hover{color:var(--ink);}
.toc li.toc-l3 a{padding-inline-start:30px;font-weight:600;font-size:13px;color:var(--ink3);}
.toc li a[aria-current]{color:var(--teal);border-inline-start-color:var(--teal);}

/* reveal-on-load (respects reduced motion) */
@media (prefers-reduced-motion: no-preference){
  .reveal{opacity:0;transform:translateY(14px);animation:qv2FadeIn .6s cubic-bezier(.2,.7,.2,1) forwards;}
  .reveal[style*="--d"]{animation-delay:var(--d);}
  @keyframes qv2FadeIn{to{opacity:1;transform:translateY(0);}}
}