/* ============================================
   ARTICLE — shared styles for article detail pages
   ============================================ */

/* BREADCRUMB */
.breadcrumb{
  padding: 20px 0 0;
  font-family: var(--font-mono);
  font-size: 11.5px; letter-spacing: 0.04em;
  color: var(--muted); text-transform: uppercase;
}
.breadcrumb a{ color: var(--muted); text-decoration: none; border-bottom: 1px solid transparent;}
.breadcrumb a:hover{ color: var(--ink); border-bottom-color: var(--ink);}
.breadcrumb .sep{ margin: 0 10px; color: var(--line);}
.breadcrumb [aria-current]{ color: var(--ink);}

/* READING PROGRESS */
.read-bar{
  position: fixed; top: 0; left: 0;
  height: 3px; width: 0%;
  background: var(--accent);
  z-index: 200;
  transition: width .1s;
}

/* HERO */
.article-hero{
  padding: clamp(40px, 6vw, 72px) 0 clamp(32px, 5vw, 56px);
  border-bottom: 1px solid var(--ink);
}
.ah-meta{
  display: flex; gap: 18px; flex-wrap: wrap;
  font-family: var(--font-mono);
  font-size: 11px; letter-spacing: 0.07em;
  text-transform: uppercase; color: var(--muted);
  align-items: center; margin-bottom: 32px;
}
.ah-meta .tag{
  background: var(--accent); color: var(--accent-ink);
  padding: 4px 10px; border-radius: 2px; font-weight: 500;
}
.ah-meta .sep{ color: var(--line);}

.ah-title{
  font-size: clamp(44px, 7vw, 104px);
  line-height: 0.94; letter-spacing: -0.03em;
  max-width: 18ch; margin: 0;
}
.ah-title em{
  font-style: italic;
  position: relative;
  display: inline-block;
  z-index: 0;
  background: transparent;
  color: var(--ink);
  padding: 0;
  border-radius: 0;
}
.ah-title em::before{
  content: "";
  position: absolute;
  left: -0.06em;
  right: -0.06em;
  bottom: 0.06em;
  height: 0.28em;
  background: var(--accent);
  z-index: -1;
  transform: skewX(-3deg);
}

.ah-body{
  display: grid; grid-template-columns: 1fr 1fr;
  gap: clamp(32px, 5vw, 72px); margin-top: 40px;
  align-items: end;
}
@media (max-width: 820px){ .ah-body{ grid-template-columns: 1fr; gap: 24px;}}

.ah-lead{
  font-family: var(--font-serif);
  font-size: clamp(20px, 2vw, 26px);
  line-height: 1.4; color: var(--ink-2);
  letter-spacing: -0.005em; max-width: 42ch;
}
.ah-lead em{ font-style: italic;}

.ah-author{
  display: grid; grid-template-columns: 56px 1fr;
  gap: 16px; align-items: center;
  padding: 20px 22px;
  border: 1px solid var(--ink); border-radius: 2px;
  background: var(--bg-card);
  max-width: 340px; justify-self: end;
}
@media (max-width: 820px){ .ah-author{ justify-self: start;}}
.ah-author .av{
  width: 56px; height: 56px;
  background: var(--ink); color: var(--accent);
  font-family: var(--font-serif); font-size: 22px;
  display: grid; place-items: center;
  border-radius: 2px;
}
.ah-author .an{
  font-family: var(--font-sans);
  font-size: 14.5px; font-weight: 500; color: var(--ink);
  margin: 0;
}
.ah-author .ar{
  font-family: var(--font-mono);
  font-size: 10.5px; letter-spacing: 0.06em;
  text-transform: uppercase; color: var(--muted);
  margin: 4px 0 0;
}

/* HERO COVER ART */
.ah-cover{
  margin-top: 48px; height: 360px;
  border: 1px solid var(--ink); border-radius: 2px;
  position: relative; background: var(--ink); overflow: hidden;
}
.ah-cover::before{
  content: ""; position: absolute; inset: 0;
  background-image:
    linear-gradient(0deg, color-mix(in oklab, var(--accent) 40%, transparent) 0 1px, transparent 1px 40px),
    linear-gradient(90deg, color-mix(in oklab, var(--accent) 40%, transparent) 0 1px, transparent 1px 40px);
  opacity: 0.35;
}
.ah-cover .c-label, .ah-cover .c-num{
  position: absolute; top: 20px;
  font-family: var(--font-mono);
  font-size: 11px; letter-spacing: 0.08em;
  text-transform: uppercase; color: var(--accent);
  background: var(--ink);
  padding: 4px 8px; border-radius: 2px;
  z-index: 3;
}
.ah-cover .c-label{ left: 24px;}
.ah-cover .c-num{ right: 24px;}
.ah-cover .c-glyph{
  position: absolute; bottom: -40px; right: 40px;
  font-family: var(--font-serif); font-size: 380px;
  line-height: 0.85; font-style: italic;
  color: var(--accent); letter-spacing: -0.05em;
  user-select: none;
}
.ah-cover .demo-modal{
  position: absolute; top: 50%; left: 80px;
  transform: translateY(-50%); width: 320px;
  background: var(--bg-card);
  border-radius: 2px; padding: 20px;
  box-shadow: 8px 8px 0 var(--accent);
  z-index: 2;
}
.ah-cover .demo-modal .dm-h{
  display: flex; justify-content: space-between; align-items: center;
  padding-bottom: 10px; border-bottom: 1px solid var(--line);
  margin-bottom: 12px;
}
.ah-cover .demo-modal .dm-title{
  font-family: var(--font-serif); font-size: 17px; color: var(--ink);
}
.ah-cover .demo-modal .dm-x{
  width: 22px; height: 22px;
  border: 1px solid var(--ink); border-radius: 2px;
  display: grid; place-items: center;
  font-family: var(--font-mono); font-size: 11px; color: var(--ink);
}
.ah-cover .demo-modal .dm-body{
  height: 8px; background: var(--line); margin-bottom: 6px; border-radius: 2px;
}
.ah-cover .demo-modal .dm-body.short{ width: 60%;}
.ah-cover .demo-modal .dm-cta{
  margin-top: 14px; background: var(--ink); color: var(--accent);
  padding: 7px 12px; display: inline-block;
  font-family: var(--font-mono); font-size: 11px;
  letter-spacing: 0.05em; text-transform: uppercase; border-radius: 2px;
}

/* Hero cover — checklist variant (for preparer article) */
.ah-cover .checklist{
  position: absolute; top: 50%; left: 80px;
  transform: translateY(-50%); width: 360px;
  background: var(--bg-card); border-radius: 2px;
  padding: 22px 24px;
  box-shadow: 8px 8px 0 var(--accent);
  z-index: 2;
}
.ah-cover .checklist .cl-h{
  font-family: var(--font-mono); font-size: 10.5px;
  letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--muted); margin-bottom: 14px;
  padding-bottom: 10px; border-bottom: 1px solid var(--line);
}
.ah-cover .checklist li{
  list-style: none; padding: 8px 0 8px 28px;
  position: relative; font-family: var(--font-sans);
  font-size: 14px; color: var(--ink); line-height: 1.3;
  border-bottom: 1px dashed var(--line);
}
.ah-cover .checklist li:last-child{ border-bottom: none;}
.ah-cover .checklist li::before{
  content: ""; position: absolute;
  left: 0; top: 10px; width: 18px; height: 18px;
  border: 1.5px solid var(--ink); border-radius: 2px;
}
.ah-cover .checklist li.done::before{
  background: var(--accent); border-color: var(--ink);
}
.ah-cover .checklist li.done::after{
  content: ""; position: absolute;
  left: 4px; top: 13px; width: 10px; height: 6px;
  border-left: 2px solid var(--ink);
  border-bottom: 2px solid var(--ink);
  transform: rotate(-45deg);
}

@media (max-width: 720px){
  .ah-cover{ height: 260px;}
  .ah-cover .c-glyph{ font-size: 220px; right: -10px; bottom: -20px;}
  .ah-cover .demo-modal, .ah-cover .checklist{ left: 24px; width: 240px; padding: 16px;}
  .ah-cover .demo-modal .dm-title{ font-size: 15px;}
}

/* LAYOUT */
.art-wrap{ padding: clamp(48px, 6vw, 88px) 0 clamp(64px, 8vw, 120px);}
.art-layout{
  display: grid;
  grid-template-columns: minmax(0, 280px) minmax(0, 1fr);
  gap: clamp(32px, 5vw, 72px); align-items: start;
}
@media (max-width: 980px){ .art-layout{ grid-template-columns: 1fr;}}

/* TOC */
.toc{
  position: sticky; top: 24px;
  padding: 24px 22px;
  border: 1px solid var(--ink); background: var(--bg-card);
  border-radius: 2px;
}
@media (max-width: 980px){ .toc{ position: static;}}
.toc .toc-k{
  font-family: var(--font-mono); font-size: 10.5px;
  letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--muted);
  padding-bottom: 14px; margin-bottom: 14px;
  border-bottom: 1px solid var(--line);
}
.toc ol{
  list-style: none; margin: 0; padding: 0;
  display: flex; flex-direction: column;
  counter-reset: toc;
}
.toc li{ margin: 0;}
.toc a{
  counter-increment: toc;
  display: grid; grid-template-columns: auto 1fr;
  gap: 12px; padding: 10px 0;
  border-bottom: 1px dashed var(--line);
  text-decoration: none; color: var(--ink);
  font-size: 14.5px; line-height: 1.35;
  transition: color .15s, background .15s;
}
.toc li:last-child a{ border-bottom: none;}
.toc a::before{
  content: counter(toc, decimal-leading-zero);
  font-family: var(--font-mono); font-size: 10.5px;
  letter-spacing: 0.05em; color: var(--muted); padding-top: 3px;
}
.toc a:hover{ color: var(--accent-ink); background: var(--accent);}
.toc a:hover::before{ color: var(--ink);}
.toc a.on{ background: var(--ink); color: var(--accent); padding-left: 10px; padding-right: 10px;}
.toc a.on::before{ color: var(--accent);}
.toc-read{
  margin-top: 20px; padding-top: 16px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono); font-size: 10.5px;
  letter-spacing: 0.05em; color: var(--muted); text-transform: uppercase;
}
.toc-read strong{ color: var(--ink); font-weight: 500;}

/* BODY */
.art-body{
  max-width: 68ch; font-size: 17.5px;
  line-height: 1.65; color: var(--ink-2);
  counter-reset: sec;
}
.art-body > p:first-of-type::first-letter{
  font-family: var(--font-serif);
  font-size: 5.2em; line-height: 0.85;
  float: left; margin: 0.05em 0.1em 0 -0.02em;
  color: var(--ink); font-style: italic;
}
.art-body h2{
  font-size: clamp(28px, 3vw, 38px);
  line-height: 1.1; letter-spacing: -0.015em;
  color: var(--ink);
  margin: 72px 0 20px; padding-top: 32px;
  border-top: 1px solid var(--ink);
  font-family: var(--font-serif); font-weight: 400;
  position: relative;
}
.art-body h2 em{ font-style: italic;}
.art-body h2::before{
  content: "§ " counter(sec, decimal-leading-zero);
  counter-increment: sec; display: block;
  font-family: var(--font-mono); font-size: 11px;
  letter-spacing: 0.1em; color: var(--muted);
  text-transform: uppercase; margin-bottom: 12px; font-weight: 500;
}
.art-body h3{
  font-family: var(--font-sans);
  font-size: 18.5px; font-weight: 600;
  letter-spacing: -0.005em; color: var(--ink);
  margin: 36px 0 14px; line-height: 1.3;
}
.art-body h4{
  font-family: var(--font-mono);
  font-size: 12px; font-weight: 500;
  letter-spacing: 0.06em; text-transform: uppercase;
  color: var(--ink); margin: 24px 0 10px;
}
.art-body h4::before{
  content: "› "; color: var(--muted);
}
.art-body p{ margin: 0 0 22px;}
.art-body strong{ color: var(--ink); font-weight: 600;}
.art-body a:not(.btn){
  color: var(--ink); text-decoration: none;
  border-bottom: 1px solid var(--accent);
  padding-bottom: 1px; font-weight: 500;
}
.art-body a:not(.btn):hover{ background: var(--accent);}

/* Blockquote */
.art-body blockquote{
  margin: 24px 0;
  padding: 18px 24px;
  border-left: 4px solid var(--accent);
  background: var(--bg-soft);
  font-family: var(--font-serif);
  font-size: 18px; line-height: 1.45;
  color: var(--ink); font-style: italic;
  border-radius: 0 2px 2px 0;
}

/* Lists */
.art-body ul, .art-body ol{
  margin: 0 0 22px; padding: 0; list-style: none;
}
.art-body ul > li, .art-body ol > li{
  position: relative; padding-left: 28px; margin-bottom: 12px;
}
.art-body ul > li::before{
  content: "—";
  position: absolute; left: 0; top: 3px;
  color: var(--accent-ink); background: var(--accent);
  width: 20px; height: 20px;
  display: grid; place-items: center;
  border-radius: 2px; font-size: 14px; font-weight: 600;
}
.art-body ol{ counter-reset: li;}
.art-body ol > li::before{
  counter-increment: li;
  content: counter(li, decimal-leading-zero);
  position: absolute; left: 0; top: 3px;
  font-family: var(--font-mono); font-size: 11px;
  color: var(--accent-ink); background: var(--accent);
  padding: 2px 5px; border-radius: 2px;
}

/* Alert boxes */
.alert{
  margin: 32px 0;
  border: 1px solid var(--ink); border-radius: 2px;
  overflow: hidden; background: var(--bg-card);
}
.alert-head{
  display: flex; align-items: center; gap: 10px;
  padding: 12px 20px;
  font-family: var(--font-mono); font-size: 11px;
  letter-spacing: 0.08em; text-transform: uppercase;
  font-weight: 500; border-bottom: 1px solid var(--ink);
  margin: 0;
}
.alert-body{ padding: 24px 24px 10px;}
.alert-body ul{ margin-bottom: 12px;}
.alert-body > :last-child{ margin-bottom: 16px;}
.alert-problem .alert-head{ background: var(--ink); color: var(--accent);}
.alert-problem .alert-head::before{ content: "🚫 "; font-size: 13px;}
.alert-solution .alert-head{ background: var(--accent); color: var(--ink);}
.alert-solution .alert-head::before{ content: "✓"; font-family: var(--font-mono); font-weight: 600;}
.alert-tip .alert-head{ background: var(--bg-soft); color: var(--ink); border-bottom: 1px solid var(--line);}
.alert-tip{ border-color: var(--line);}
.alert-tip .alert-head::before{ content: "★"; color: var(--accent-ink); background: var(--accent); padding: 2px 6px; border-radius: 2px;}

/* Code */
.art-body pre{
  margin: 16px 0;
  background: var(--ink);
  color: color-mix(in oklab, var(--bg) 90%, white);
  border-radius: 2px; padding: 18px 20px;
  overflow-x: auto;
  font-family: var(--font-mono); font-size: 13px;
  line-height: 1.55; border: 1px solid var(--ink);
}
.art-body pre code{
  font-family: inherit; font-size: inherit; color: inherit;
  background: none; padding: 0;
}
.art-body code:not(pre code){
  font-family: var(--font-mono); font-size: 0.88em;
  background: color-mix(in oklab, var(--accent) 35%, var(--bg));
  color: var(--ink); padding: 2px 6px; border-radius: 2px;
  border: 1px solid color-mix(in oklab, var(--ink) 10%, transparent);
}
.art-body pre .kw{ color: #f2c14e;}
.art-body pre .at{ color: #9ad5b3;}
.art-body pre .st{ color: #ffd23f;}
.art-body pre .co{ color: #8899a6;}

/* Pull image */
.pull-img{
  margin: 40px 0;
  background: var(--bg-soft);
  border: 1px solid var(--ink); border-radius: 2px;
  padding: 32px; position: relative;
}
.pull-img .pi-cap{
  margin-top: 16px;
  font-family: var(--font-mono); font-size: 11px;
  letter-spacing: 0.05em; color: var(--muted); text-transform: uppercase;
}
.pull-img .pi-cap b{ color: var(--ink); font-weight: 500;}

/* Pull quote */
.pull-quote{
  margin: 48px 0; padding: 0 0 0 32px;
  border-left: 4px solid var(--accent);
}
.pull-quote p{
  font-family: var(--font-serif);
  font-size: clamp(22px, 2.2vw, 28px);
  line-height: 1.3; color: var(--ink);
  letter-spacing: -0.01em; font-style: italic;
}

/* Key figures row */
.kpi-row{
  margin: 40px 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  border: 1px solid var(--ink); border-radius: 2px;
  background: var(--bg-card);
}
@media (max-width: 720px){ .kpi-row{ grid-template-columns: 1fr;}}
.kpi{
  padding: 22px 24px;
  border-right: 1px solid var(--ink);
}
.kpi:last-child{ border-right: none;}
@media (max-width: 720px){
  .kpi{ border-right: none; border-bottom: 1px solid var(--ink);}
  .kpi:last-child{ border-bottom: none;}
}
.kpi .k-num{
  font-family: var(--font-serif); font-size: 42px;
  line-height: 1; color: var(--ink);
  letter-spacing: -0.02em; font-style: italic;
}
.kpi .k-lab{
  margin-top: 8px;
  font-family: var(--font-mono); font-size: 10.5px;
  letter-spacing: 0.06em; text-transform: uppercase;
  color: var(--muted);
}

/* Conclusion CTA */
.concl-cta{
  margin-top: 48px; padding: 32px;
  background: var(--ink); color: var(--bg);
  border-radius: 2px;
  display: flex; justify-content: space-between; align-items: center;
  gap: 24px; flex-wrap: wrap;
}
.concl-cta h3{
  font-family: var(--font-serif); font-size: 24px;
  line-height: 1.2; color: var(--bg);
  margin: 0 0 6px; font-weight: 400;
}
.concl-cta p{
  font-size: 14.5px; margin: 0;
  color: color-mix(in oklab, var(--bg) 70%, var(--ink));
}

/* Post foot */
.post-foot{
  margin-top: 64px; padding-top: 32px;
  border-top: 1px solid var(--ink);
  display: flex; justify-content: space-between;
  gap: 20px; flex-wrap: wrap;
}
.pf-tags{ display: flex; gap: 8px; flex-wrap: wrap;}
.pf-tags a{
  font-family: var(--font-mono); font-size: 11px;
  letter-spacing: 0.04em; color: var(--ink); text-decoration: none;
  padding: 5px 10px; border: 1px solid var(--ink); border-radius: 2px;
  transition: background .15s;
}
.art-body .pf-tags a:hover,
.pf-tags a:hover{ background: var(--ink) !important; color: var(--accent) !important;}
.pf-share{
  display: flex; gap: 8px; align-items: center;
  font-family: var(--font-mono); font-size: 11px;
  letter-spacing: 0.05em; text-transform: uppercase; color: var(--muted);
}
.pf-share a{
  padding: 5px 10px; border: 1px solid var(--ink);
  color: var(--ink); text-decoration: none; border-radius: 2px;
}
.pf-share a:hover{ background: var(--accent); color: var(--ink);}

/* Prev / Next */
.pn{
  display: grid; grid-template-columns: 1fr 1fr; gap: 0;
  margin-top: 56px;
  border: 1px solid var(--ink); border-radius: 2px;
  background: var(--bg-card); overflow: hidden;
}
@media (max-width: 720px){ .pn{ grid-template-columns: 1fr;}}
.pn-item{
  padding: 22px 24px; text-decoration: none; color: var(--ink);
  transition: background .15s;
}
.pn-item:first-child{ border-right: 1px solid var(--ink);}
@media (max-width: 720px){
  .pn-item:first-child{ border-right: none; border-bottom: 1px solid var(--ink);}
}
.pn-item:hover{ background: var(--bg-soft);}
.pn-dir{
  font-family: var(--font-mono); font-size: 10.5px;
  letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--muted); margin-bottom: 8px;
}
.pn-item.next{ text-align: right;}
.pn-title{
  font-family: var(--font-serif); font-size: 19px;
  line-height: 1.3; color: var(--ink);
}
.pn-title em{ font-style: italic;}

/* Related */
.related-section{
  background: var(--bg-soft);
  border-top: 1px solid var(--ink);
  padding: clamp(56px, 7vw, 96px) 0;
}
.related-head{
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 32px; align-items: end; margin-bottom: 40px;
}
@media (max-width: 720px){ .related-head{ grid-template-columns: 1fr;}}
.related-head h2{
  font-size: clamp(32px, 4vw, 52px);
  line-height: 1; margin-top: 18px;
}
.rel-grid{
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 0;
  border-top: 1px solid var(--ink); border-left: 1px solid var(--ink);
}
@media (max-width: 900px){ .rel-grid{ grid-template-columns: 1fr;}}
.rel-card{
  border-right: 1px solid var(--ink); border-bottom: 1px solid var(--ink);
  background: var(--bg-card); padding: 24px 24px 22px;
  position: relative; transition: background .15s;
}
.rel-card:hover{ background: var(--accent);}
.rel-card a{ position: absolute; inset: 0;}
.rel-card .rm{
  font-family: var(--font-mono); font-size: 10.5px;
  letter-spacing: 0.07em; text-transform: uppercase;
  color: var(--muted); margin: 0 0 10px;
}
.rel-card h3{
  font-family: var(--font-serif); font-size: 22px;
  line-height: 1.15; letter-spacing: -0.015em;
  color: var(--ink); margin-bottom: 10px; font-weight: 400;
}
.rel-card h3 em{ font-style: italic;}
.rel-card p{ font-size: 13.5px; color: var(--ink-2); line-height: 1.5; margin: 0;}
.rel-card .arrow{
  margin-top: 16px; font-family: var(--font-mono);
  font-size: 11px; letter-spacing: 0.05em; color: var(--ink);
}