/* ============================================================================
   AI Friendly — Blog surfaces
   Editorial layer of the Growth system. Field-guide, workbench-like.
   Load: ../styles/tokens.css → ../styles/components.css → ../public/public.css → blog.css
   ============================================================================ */

/* ---------- Blog hero ---------- */
.bhero { padding: 56px 0 36px; }
.bhero .t-eyebrow { color: var(--af-blue-700); }
.bhero h1 {
  font-family: var(--font-display);
  font-size: clamp(38px, 4.6vw, 56px);
  line-height: 1.05;
  letter-spacing: -0.03em;
  font-weight: 580;
  margin: 16px 0 0;
  max-width: 20ch;
  text-wrap: balance;
}
.bhero h1 em,
.feat h2 em,
.art-head h1 em,
.bempty h3 em,
.scancta h3 em {
  font-family: 'Iowan Old Style', Georgia, serif;
  font-style: italic;
  font-weight: 500;
  color: var(--af-blue);
}
.bhero__lede {
  font-size: 16.5px; line-height: 1.6; color: var(--text-2);
  max-width: 62ch; margin: 16px 0 0;
}
.bhero__lede b { color: var(--text-1); font-weight: 550; }

/* ---------- Toolbar: category filters + search ---------- */
.btoolbar {
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  margin-top: 32px;
  background: var(--bg);
}
.btoolbar__inner {
  display: flex; align-items: center; gap: 16px;
  padding: 12px 0;
}
.fchips { display: flex; align-items: center; gap: 6px; flex-wrap: wrap; flex: 1; min-width: 0; }
.fchip {
  display: inline-flex; align-items: center; gap: 7px;
  height: 30px; padding: 0 12px;
  border-radius: var(--r-full);
  border: 1px solid transparent;
  background: transparent;
  font-size: 13px; font-weight: 500; color: var(--text-2);
  white-space: nowrap;
  transition: background 120ms var(--ease-out), color 120ms var(--ease-out), border-color 120ms var(--ease-out);
}
.fchip:hover { background: var(--ink-100); color: var(--text-1); }
.fchip.is-on { background: var(--af-blue-50); color: var(--af-blue-700); border-color: var(--af-blue-100); font-weight: 550; }
.fchip .n { font-family: var(--font-mono); font-size: 10.5px; color: var(--text-4); }
.fchip.is-on .n { color: var(--af-blue); }

.bsearch {
  display: inline-flex; align-items: center; gap: 8px;
  height: 36px; padding: 0 12px;
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  background: var(--surface);
  width: 240px; flex-shrink: 0;
  transition: border-color 120ms, box-shadow 120ms;
}
.bsearch:focus-within { border-color: var(--af-blue); box-shadow: 0 0 0 3px var(--af-blue-50); }
.bsearch svg { width: 14px; height: 14px; color: var(--text-4); flex-shrink: 0; }
.bsearch input {
  border: none; outline: none; background: transparent;
  font-family: inherit; font-size: 13.5px; color: var(--text-1);
  width: 100%; padding: 0;
}
.bsearch input::placeholder { color: var(--text-4); }
.bsearch__kbd {
  font-family: var(--font-mono); font-size: 10px; color: var(--text-4);
  border: 1px solid var(--border); border-radius: 4px; padding: 1px 5px;
  flex-shrink: 0;
}

/* Result meta line (visible while filtering/searching) */
.bresults {
  font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.06em;
  text-transform: uppercase; color: var(--text-3);
  padding: 20px 0 0;
}
.bresults b { color: var(--text-1); font-weight: 600; }
.bresults button {
  background: none; border: none; padding: 0; margin-left: 10px;
  font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.06em;
  text-transform: uppercase; color: var(--af-blue-700); cursor: pointer;
}
.bresults button:hover { color: var(--af-blue); }

/* ---------- Two-column page layout ---------- */
.blayout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 56px;
  padding: 8px 0 72px;
  align-items: start;
}
.bside { position: sticky; top: 88px; display: flex; flex-direction: column; gap: 20px; }

/* ---------- Featured article module ---------- */
.feat {
  display: grid; grid-template-columns: 1.45fr 1fr;
  border: 1px solid var(--border);
  border-radius: 18px;
  background: var(--surface);
  overflow: hidden;
  margin: 28px 0 8px;
  box-shadow: var(--shadow-sm);
}
.feat__main { padding: 30px 34px 26px; display: flex; flex-direction: column; align-items: flex-start; gap: 14px; }
.feat__label { font-family: var(--font-mono); font-size: 10px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--af-blue-700); }
.feat h2 {
  font-family: var(--font-display);
  font-size: clamp(24px, 2.6vw, 31px);
  line-height: 1.14; letter-spacing: -0.022em; font-weight: 580;
  margin: 0; text-wrap: balance;
}
.feat h2 a:hover { color: var(--af-blue-700); }
.feat__dek { font-size: 14.5px; line-height: 1.6; color: var(--text-2); margin: 0; max-width: 56ch; }
.feat__foot { display: flex; align-items: center; gap: 14px; margin-top: auto; padding-top: 10px; flex-wrap: wrap; }
.feat__aside {
  background: var(--ink-50);
  border-left: 1px solid var(--border);
  padding: 26px 28px;
  display: flex; flex-direction: column; gap: 14px;
}
.feat__aside-label { font-family: var(--font-mono); font-size: 10px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--text-3); }
.feat__aside ul { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 11px; }
.feat__aside li {
  display: grid; grid-template-columns: 16px 1fr; gap: 10px; align-items: start;
  font-size: 13px; line-height: 1.45; color: var(--text-2);
}
.feat__aside li svg { width: 14px; height: 14px; color: var(--af-blue); margin-top: 2px; }
.feat__aside-foot { margin-top: auto; padding-top: 12px; border-top: 1px solid var(--border); font-family: var(--font-mono); font-size: 10.5px; letter-spacing: 0.05em; color: var(--text-4); text-transform: uppercase; }

/* ---------- Meta line (shared) ---------- */
.bmeta {
  display: inline-flex; align-items: center; gap: 8px; flex-wrap: wrap;
  font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.04em;
  color: var(--text-3); text-transform: uppercase;
}
.bmeta .sep { color: var(--text-4); }

/* ---------- Article list rows ---------- */
.alist { display: flex; flex-direction: column; }
.arow {
  display: flex; flex-direction: column; align-items: flex-start; gap: 9px;
  padding: 26px 0;
  border-bottom: 1px solid var(--border);
}
.arow__top { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.arow h3 {
  font-family: var(--font-display);
  font-size: 20.5px; line-height: 1.25; letter-spacing: -0.018em; font-weight: 580;
  margin: 0; max-width: 36ch; text-wrap: balance;
}
.arow h3 a { transition: color 120ms; }
.arow h3 a:hover { color: var(--af-blue-700); }
.arow p { font-size: 14px; line-height: 1.6; color: var(--text-3); margin: 0; max-width: 68ch; }
.arow.is-hidden { display: none; }
.arow__read { font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.06em; text-transform: uppercase; color: var(--af-blue-700); }
.arow__read:hover { color: var(--af-blue); }

/* ---------- Empty search state ---------- */
.bempty {
  border: 1px dashed var(--border-strong);
  border-radius: 16px;
  padding: 56px 32px;
  text-align: center;
  display: none;
  flex-direction: column; align-items: center; gap: 10px;
  margin-top: 28px;
}
.bempty.is-shown { display: flex; }
.bempty .t-eyebrow { color: var(--text-4); }
.bempty h3 {
  font-family: var(--font-display);
  font-size: 24px; line-height: 1.2; letter-spacing: -0.02em; font-weight: 580;
  margin: 4px 0 0;
}
.bempty p { font-size: 14px; line-height: 1.6; color: var(--text-3); margin: 0; max-width: 46ch; }
.bempty__actions { display: flex; gap: 10px; margin-top: 12px; flex-wrap: wrap; justify-content: center; }
.bempty__hint {
  margin-top: 18px; padding-top: 16px; border-top: 1px solid var(--border);
  font-size: 13px; color: var(--text-3); display: inline-flex; align-items: center; gap: 8px;
}
.bempty__hint a { color: var(--af-blue-700); font-weight: 550; }
.bempty__hint a:hover { color: var(--af-blue); }

/* ---------- Sidebar scan CTA ---------- */
.scancta {
  border: 1px solid var(--border);
  border-radius: 16px;
  background: var(--surface);
  padding: 22px;
  display: flex; flex-direction: column; gap: 12px;
  box-shadow: var(--shadow-xs);
}
.scancta .t-eyebrow { color: var(--af-blue-700); font-size: 10px; }
.scancta h3 {
  font-family: var(--font-display);
  font-size: 20px; line-height: 1.2; letter-spacing: -0.02em; font-weight: 580;
  margin: 0;
}
.scancta p { font-size: 13.5px; line-height: 1.55; color: var(--text-2); margin: 0; }
.scancta__snap {
  background: var(--ink-900);
  border-radius: 10px;
  padding: 13px 15px;
  font-family: var(--font-mono); font-size: 11px; line-height: 1.9;
  color: rgba(255,255,255,0.78);
}
.scancta__snap .ln { display: flex; gap: 9px; white-space: nowrap; }
.scancta__snap .ok { color: #5BD9A5; }
.scancta__snap .wn { color: #F0B05E; }
.scancta__snap .pr { color: #8FB5F8; }
.scancta .btn { width: 100%; justify-content: center; }
.scancta__micro {
  font-family: var(--font-mono); font-size: 10px; letter-spacing: 0.07em;
  text-transform: uppercase; color: var(--text-4); text-align: center;
}
/* Inline (mobile) variant — hidden on desktop */
.scancta--inline { display: none; margin: 4px 0; }

/* ---------- Sidebar topic list ---------- */
.btopics {
  border: 1px solid var(--border);
  border-radius: 16px;
  background: var(--surface);
  padding: 18px 22px 10px;
}
.btopics .t-eyebrow { font-size: 10px; }
.btopics ul { list-style: none; margin: 12px 0 0; padding: 0; }
.btopics li { border-bottom: 1px solid var(--ink-100); }
.btopics li:last-child { border-bottom: none; }
.btopics button {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  width: 100%; background: none; border: none; padding: 10px 0;
  font-family: inherit; font-size: 13.5px; font-weight: 500; color: var(--text-2);
  cursor: pointer; text-align: left;
  transition: color 120ms;
}
.btopics button:hover { color: var(--af-blue-700); }
.btopics button .n { font-family: var(--font-mono); font-size: 10.5px; color: var(--text-4); }

/* ============================================================================
   ARTICLE PAGE
   ============================================================================ */
.art-crumbs { padding: 22px 0 0; }
.art-crumbs .crumbs a:hover { color: var(--text-1); }

.art-head { padding: 26px 0 6px; }
.art-head__top { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.art-head h1 {
  font-family: var(--font-display);
  font-size: clamp(32px, 3.8vw, 46px);
  line-height: 1.08; letter-spacing: -0.028em; font-weight: 580;
  margin: 18px 0 0; max-width: 24ch; text-wrap: balance;
}
.art-head__dek {
  font-size: 17.5px; line-height: 1.6; color: var(--text-2);
  margin: 16px 0 0; max-width: 58ch;
}
.art-byline {
  display: flex; align-items: center; gap: 12px; flex-wrap: wrap;
  margin-top: 22px; padding: 16px 0;
  border-top: 1px solid var(--border); border-bottom: 1px solid var(--border);
}
.art-byline__avatar {
  width: 30px; height: 30px; border-radius: 8px;
  background: var(--af-blue); color: #fff;
  display: inline-flex; align-items: center; justify-content: center;
  font-family: var(--font-display); font-size: 12px; font-weight: 700;
  flex-shrink: 0;
}
.art-byline__who { display: flex; flex-direction: column; gap: 1px; }
.art-byline__name { font-size: 13.5px; font-weight: 550; color: var(--text-1); line-height: 1.2; }
.art-byline__role { font-family: var(--font-mono); font-size: 10px; letter-spacing: 0.07em; text-transform: uppercase; color: var(--text-4); }
.art-byline .bmeta { margin-left: auto; }

/* Article body typography */
.art-body { max-width: 68ch; padding: 28px 0 8px; }
.art-body > p { font-size: 16px; line-height: 1.72; color: var(--text-2); margin: 0 0 22px; text-wrap: pretty; }
.art-body > p b, .art-body > p strong { color: var(--text-1); font-weight: 600; }
.art-body a { color: var(--af-blue-700); border-bottom: 1px solid var(--af-blue-200); transition: color 120ms, border-color 120ms; }
.art-body a:hover { color: var(--af-blue); border-color: var(--af-blue); }
.art-body h2 {
  font-family: var(--font-display);
  font-size: 26px; line-height: 1.2; letter-spacing: -0.02em; font-weight: 580;
  margin: 46px 0 16px;
  scroll-margin-top: 88px;
}
.art-body h2 .hn {
  font-family: var(--font-mono); font-size: 12px; font-weight: 600;
  color: var(--text-4); letter-spacing: 0.06em;
  display: block; margin-bottom: 8px;
}
.art-body h3 {
  font-family: var(--font-display);
  font-size: 19px; line-height: 1.3; letter-spacing: -0.015em; font-weight: 580;
  margin: 30px 0 12px;
}
.art-body ul, .art-body ol { margin: 0 0 22px; padding-left: 22px; display: flex; flex-direction: column; gap: 9px; }
.art-body li { font-size: 15.5px; line-height: 1.65; color: var(--text-2); }
.art-body li b { color: var(--text-1); font-weight: 600; }
.art-body .codeblock { margin: 0 0 24px; }
.art-body figure { margin: 0 0 24px; }

/* Insight callout — "field note" */
.callout-note {
  border: 1px solid var(--border);
  border-left: 2px solid var(--af-blue);
  background: var(--ink-50);
  border-radius: 0 12px 12px 0;
  padding: 16px 20px 17px;
  margin: 0 0 24px;
  display: flex; flex-direction: column; gap: 7px;
}
.callout-note .t-eyebrow { color: var(--af-blue-700); font-size: 10px; }
.callout-note p { font-size: 14.5px; line-height: 1.6; color: var(--text-2); margin: 0; }
.callout-note p b { color: var(--text-1); font-weight: 600; }

/* Product callout — scan handoff */
.callout-product {
  border: 1px solid var(--af-blue-100);
  background: var(--af-blue-50);
  border-radius: 14px;
  padding: 20px 22px;
  margin: 8px 0 28px;
  display: grid; grid-template-columns: 1fr auto; gap: 8px 24px; align-items: center;
}
.callout-product .t-eyebrow { color: var(--af-blue-700); font-size: 10px; grid-column: 1 / -1; }
.callout-product p { font-size: 14.5px; line-height: 1.55; color: var(--text-2); margin: 0; max-width: 48ch; }
.callout-product p b { color: var(--text-1); font-weight: 600; }
.callout-product .btn { white-space: nowrap; }

/* Data table */
.art-table { width: 100%; border-collapse: collapse; margin: 0 0 24px; border: 1px solid var(--border); border-radius: 12px; overflow: hidden; }
.art-table-wrap { border: 1px solid var(--border); border-radius: 12px; overflow: hidden; margin: 0 0 24px; background: var(--surface); }
.art-table-wrap table { width: 100%; border-collapse: collapse; }
.art-table-wrap th {
  font-family: var(--font-mono); font-size: 10.5px; letter-spacing: 0.07em;
  text-transform: uppercase; color: var(--text-3); font-weight: 600;
  text-align: left; padding: 11px 16px;
  background: var(--ink-50); border-bottom: 1px solid var(--border);
}
.art-table-wrap td { font-size: 13.5px; line-height: 1.5; color: var(--text-2); padding: 12px 16px; border-bottom: 1px solid var(--ink-100); vertical-align: top; }
.art-table-wrap tr:last-child td { border-bottom: none; }
.art-table-wrap td b { color: var(--text-1); font-weight: 600; }

/* TOC */
.toc {
  border: 1px solid var(--border);
  border-radius: 16px;
  background: var(--surface);
  padding: 18px 22px;
}
.toc .t-eyebrow { font-size: 10px; }
.toc ol { list-style: none; margin: 12px 0 0; padding: 0; display: flex; flex-direction: column; }
.toc a {
  display: flex; gap: 10px; align-items: baseline;
  padding: 7px 0;
  font-size: 13.5px; color: var(--text-3); line-height: 1.4;
  border-left: 2px solid transparent;
  transition: color 120ms;
}
.toc a .tn { font-family: var(--font-mono); font-size: 10px; color: var(--text-4); flex-shrink: 0; }
.toc a:hover { color: var(--text-1); }
.toc a.is-on { color: var(--af-blue-700); font-weight: 550; }
.toc a.is-on .tn { color: var(--af-blue); }

/* Related topic pills (sidebar) */
.rel-topics { display: flex; flex-wrap: wrap; gap: 7px; margin-top: 12px; }

/* Keep reading */
.keepread { padding: 8px 0 72px; }
.keepread .t-eyebrow { display: block; padding-bottom: 4px; border-bottom: 1px solid var(--border); }

/* ============================================================================
   RESPONSIVE
   ============================================================================ */
@media (max-width: 1060px) {
  .blayout { grid-template-columns: minmax(0, 1fr) 280px; gap: 36px; }
}

@media (max-width: 920px) {
  .blayout { grid-template-columns: 1fr; gap: 0; }
  .bside { display: none; }
  .scancta--inline { display: flex; }
  .feat { grid-template-columns: 1fr; }
  .feat__aside { border-left: none; border-top: 1px solid var(--border); }
  .btoolbar__inner { flex-direction: column-reverse; align-items: stretch; gap: 10px; }
  .bsearch { width: 100%; height: 40px; }
  .bsearch__kbd { display: none; }
  .fchips {
    flex-wrap: nowrap; overflow-x: auto; padding-bottom: 2px;
    scrollbar-width: none; -webkit-overflow-scrolling: touch;
  }
  .fchips::-webkit-scrollbar { display: none; }
  .art-byline .bmeta { margin-left: 0; width: 100%; }
}

@media (max-width: 600px) {
  .bhero { padding: 40px 0 28px; }
  .bhero__lede { font-size: 15px; }
  .feat__main { padding: 24px 22px 22px; }
  .feat__aside { padding: 22px; }
  .arow h3 { font-size: 18.5px; }
  .art-body > p { font-size: 15.5px; }
  .callout-product { grid-template-columns: 1fr; }
  .callout-product .btn { width: 100%; justify-content: center; }
  .bempty { padding: 40px 20px; }
}