/*
  Signal & Sense — shared design kit (dry-run preview only)
  One token layer + one set of shared primitives for dry-run-issue.html
  and full-wire-feed.html. Page-specific layout lives in each page's
  own <style> block; this file holds only what both pages share.
*/

:root{
  color-scheme: light;

  --display: "Fraunces", Georgia, "Times New Roman", serif;
  --sans:    "IBM Plex Sans", Arial, sans-serif;
  --mono:    "IBM Plex Mono", ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;

  --canvas:         #F7F9FC;
  --surface:        #FFFFFF;
  --surface-subtle: #EEF3F9;

  --ink:   #101828;
  --text:  #263449;
  --muted: #5C687A;
  --faint: #929CAB; /* decorative only — never for meaningful text, icons, or arrows */

  --border:        #CAD2E0;
  --divider:       #E1E6EF;
  --border-strong: #7D8BA0;

  --brand:       #2357D9;
  --brand-hover: #1945B8;
  --brand-soft:  #E4EBFF;
  --focus:       #2357D9;

  --cat-labs:          #BFEAF2; --cat-labs-ink:      #0B4B57;
  --cat-agents:        #C9D7FF; --cat-agents-ink:    #203E85;
  --cat-research:      #CDEEDD; --cat-research-ink:  #15543B;
  --cat-biz:           #F4D77E; --cat-biz-ink:       #654B00;
  --cat-tutorials:     #F3CEE0; --cat-tutorials-ink: #712E4A;
  --cat-notable:       #DED3F6; --cat-notable-ink:   #49317A;

  --success: #237A52;
  --error:   #B42318;

  --space-1: 4px;  --space-2: 8px;  --space-3: 12px; --space-4: 16px; --space-5: 20px;
  --space-6: 24px; --space-8: 32px; --space-10: 40px; --space-12: 48px; --space-16: 64px;
  --gutter: clamp(16px, 5vw, 40px);
  --section-gap: clamp(40px, 5vw, 48px);

  --measure-reading: 44rem;
  --measure-index:   50rem;
  --measure-prose:   38rem;

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-pill: 999px;

  --shadow-accent: 3px 3px 0 var(--brand);
}
.hp-field{position:absolute!important;left:-9999px!important;width:1px!important;height:1px!important;overflow:hidden!important}
.consent-line{display:flex;gap:9px;align-items:flex-start;margin-top:12px;font-size:12.5px;line-height:1.5;color:var(--muted)}
.consent-line input{flex:0 0 auto;margin-top:3px;width:18px;height:18px;accent-color:var(--brand)}
.subscribe-success{padding:8px 0;color:var(--ink)}
.subscribe-success p{margin:4px 0 0;color:var(--muted)}

/* ============ reset & base ============ */
*{box-sizing:border-box}
html{background:var(--canvas);-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;background:var(--canvas);color:var(--text);
  font-family:var(--sans);font-size:17px;line-height:1.6;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
}
::selection{background:var(--brand-soft);color:var(--ink)}
a{color:inherit;text-decoration-thickness:1px;text-underline-offset:3px}
img{display:block;max-width:100%}
.mono{font-family:var(--mono);font-feature-settings:"ss01"}
.sr-only{position:absolute!important;width:1px!important;height:1px!important;padding:0!important;margin:-1px!important;overflow:hidden!important;clip:rect(0,0,0,0)!important;white-space:nowrap!important;border:0!important}

/* ============ focus ============ */
a:focus-visible,button:focus-visible,input:focus-visible,[tabindex]:focus-visible{
  outline:3px solid var(--focus);outline-offset:3px;border-radius:2px;
}

/* ============ skip links ============ */
.skip-link{
  position:absolute;left:12px;top:-60px;z-index:100;
  background:var(--ink);color:#fff;font:600 13px/1.4 var(--mono);
  padding:10px 16px;border-radius:var(--radius-sm);
  transition:top .15s ease;text-decoration:none;
}
.skip-link:focus{top:12px}
.skip-link + .skip-link{left:220px}
.skip-link + .skip-link:focus{left:12px;top:58px}

/* ============ shell / measures ============ */
.shell{margin:0 auto;padding:0 var(--gutter) 80px}
.shell--reading{max-width:var(--measure-reading)}
.shell--index{max-width:var(--measure-index)}
@media (max-width:480px){.shell{padding-inline:16px;padding-bottom:56px}}

/* ============ masthead (one component, one scale, both pages) ============ */
.masthead{padding-top:clamp(22px,5vw,40px);display:flex;align-items:center;gap:18px}
.masthead .stack{flex:1 1 auto;min-width:0}
.nameplate h1{
  font-family:var(--display);font-optical-sizing:auto;font-weight:600;
  font-size:clamp(30px,6.2vw,42px);line-height:.98;letter-spacing:-.026em;
  color:var(--ink);margin:0;
}
.nameplate h1 .r{color:var(--brand)}
.tagline{
  margin:9px 0 0;font-family:var(--sans);font-style:normal;font-weight:400;
  font-size:15px;color:var(--muted);letter-spacing:-.005em;
}
.folio{
  display:flex;align-items:center;justify-content:space-between;gap:14px;flex-wrap:wrap;
  margin-top:14px;font-family:var(--mono);font-size:11px;letter-spacing:.06em;
  text-transform:uppercase;color:var(--muted);font-weight:500;
}
.folio .live{display:inline-flex;align-items:center;gap:7px;color:var(--muted)}
.folio .live i{width:6px;height:6px;border-radius:50%;background:var(--brand);font-style:normal}
.folio a.back{
  display:inline-flex;align-items:center;gap:6px;min-height:44px;
  padding:6px 2px;color:var(--brand);font-weight:600;text-decoration:none;
}
.folio a.back:hover{text-decoration:underline}
.rule-2{margin-top:16px;border-top:2px solid var(--ink);border-bottom:1px solid var(--border);height:4px}
@media (max-width:480px){
  .masthead{padding-top:18px;align-items:flex-start;gap:12px}
  .nameplate h1{font-size:30px}
  .tagline{margin-top:6px;font-size:14px}
  .folio{margin-top:8px;display:block;font-size:10.5px;letter-spacing:.04em}
}

/* ============ kicker badge (editorial hierarchy only — not category labels) ============ */
.badge{
  display:inline-flex;align-items:center;gap:8px;min-height:28px;
  font-family:var(--mono);font-weight:600;font-size:11px;letter-spacing:.06em;text-transform:uppercase;
  background:var(--ink);color:#fff;border-radius:var(--radius-pill);padding:7px 14px 6px;
}
.badge .dash{width:14px;height:2px;background:#fff;flex-shrink:0}

/* ============ category marker ============ */
/* feed section heading bar: 24x4px color bar, see page-specific .cat .lbl::before */
/* top-five number circle: 32px, category fill + matching ink */
.cat-word{display:block;margin:1px 0 4px;font:600 11px/1.2 var(--mono);letter-spacing:.06em;text-transform:uppercase;color:var(--muted)}

/* ============ story link (shared row/feature behavior) ============ */
a:focus-visible.item-line,a.item-line:focus-visible{outline-offset:5px}
.go{font-family:var(--mono)}

/* ============ editorial callout ("why it matters" / analysis) ============ */
.callout{
  margin-top:16px;background:var(--surface);border:1px solid var(--border);
  border-radius:var(--radius-md);padding:16px 18px;
}
.callout .analysis-label{
  display:inline-flex;align-items:center;gap:8px;margin:0 0 10px;
  font:600 11px/1.3 var(--mono);letter-spacing:.06em;text-transform:uppercase;color:var(--brand-hover);
}
.callout .analysis-label .dash{width:14px;height:2px;background:var(--brand);flex-shrink:0}
.callout p{margin:0;font-size:15.5px;line-height:1.6;color:var(--text)}
@media (min-width:768px){.callout{padding:18px}}

/* ============ explainer card (hero) + teaser (compact sibling) ============ */
.explainer-card{
  background:var(--surface);border:2px solid var(--ink);border-left:4px solid var(--brand);
  border-radius:var(--radius-lg);box-shadow:var(--shadow-accent);padding:24px;
}
.explainer-top{display:flex;align-items:center;gap:10px;margin-bottom:14px}
.explainer-top .voice{font-family:var(--mono);font-size:11px;letter-spacing:.06em;text-transform:uppercase;color:var(--brand-hover);font-weight:600}
.explainer-card h3{
  font-family:var(--display);font-weight:700;font-size:clamp(24px,3.2vw,26px);
  letter-spacing:-.016em;color:var(--ink);margin:0 0 14px;line-height:1.15;
}
.explainer-visual{
  display:block;width:100%;height:auto;aspect-ratio:16/9;object-fit:cover;
  margin:2px 0 10px;border:1px solid var(--border);border-radius:var(--radius-md);background:var(--canvas);
}
.explainer-block{margin-top:15px}
.explainer-block .eb-label{
  font-family:var(--mono);font-size:11px;letter-spacing:.06em;text-transform:uppercase;
  color:var(--brand-hover);font-weight:600;margin:0 0 5px;
}
.explainer-block p{margin:0;font-size:16px;line-height:1.6;color:var(--text)}
.explainer-block ul{margin:6px 0 0;padding-left:18px}
.explainer-block li{font-size:16px;line-height:1.6;color:var(--text);margin-top:5px}
.explainer-block li b{font-weight:700}
.loop-list{list-style:none;padding:0!important;counter-reset:loop}
.loop-list li{counter-increment:loop;display:grid;grid-template-columns:26px 1fr;gap:9px;align-items:start}
.loop-list li::before{
  content:counter(loop);display:grid;place-items:center;width:24px;height:24px;
  border:1px solid var(--border);border-radius:50%;font:700 11px var(--mono);
  background:var(--brand-soft);color:var(--brand-hover);
}
.explainer-takeaway{
  margin-top:18px;padding:13px 14px;background:var(--brand-soft);
  border-left:3px solid var(--brand);border-radius:var(--radius-sm);
  font-size:16px;line-height:1.58;color:var(--text);font-style:normal;
}
.explainer-takeaway b{font-weight:700}
@media (max-width:480px){.explainer-card{padding:18px}}

.explainer-teaser{
  margin:var(--section-gap) 0 0;padding:16px 18px;background:var(--surface);
  border:1px solid var(--border);border-left:4px solid var(--brand);
  border-radius:var(--radius-md);box-shadow:none;
}
.explainer-teaser p{margin:0;font-size:15.5px;line-height:1.6;color:var(--text)}
.explainer-teaser p + p{margin-top:8px}
.explainer-teaser a{font-weight:600;color:var(--brand);text-decoration:underline;text-underline-offset:3px}
.explainer-teaser a:hover{color:var(--brand-hover)}

/* ============ Field Notes / diagram media ============ */
.field-notes-eyebrow{display:block;margin:0 0 8px;font:600 11px/1.3 var(--mono);letter-spacing:.06em;text-transform:uppercase;color:var(--brand-hover)}
.edition-visual{margin:0;width:100%}
.edition-visual img{width:100%;height:auto;border:1px solid var(--border);border-radius:var(--radius-md);background:var(--surface)}
.media-expand{
  display:inline-flex;align-items:center;gap:4px;min-height:44px;margin-top:10px;
  padding:8px 4px;font:600 12px var(--mono);color:var(--brand);
  text-decoration:underline;text-underline-offset:3px;
}
.media-expand:hover{color:var(--brand-hover)}

/* ============ subscribe card ============ */
.subscribe{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);padding:24px}
.subscribe h4{font-family:var(--display);font-weight:700;font-size:21px;letter-spacing:-.014em;color:var(--ink);margin:0 0 8px}
.subscribe .pitch{margin:0 0 18px;font-size:15px;line-height:1.6;color:var(--text)}
.sub-row{display:flex;gap:10px;flex-wrap:wrap;align-items:flex-start}
.sub-field{flex:1 1 220px;min-width:0}
.sub-field label{display:block;margin:0 0 6px;font:600 12px/1.3 var(--mono);color:var(--text)}
.sub-row input{
  width:100%;font-family:var(--mono);font-size:13px;color:var(--text);
  background:var(--surface);border:1px solid var(--border-strong);border-radius:var(--radius-sm);
  min-height:48px;padding:12px 14px;
}
.sub-row input::placeholder{color:var(--muted)}
.sub-row button{
  flex:0 0 auto;font-family:var(--mono);font-size:12px;font-weight:700;letter-spacing:.06em;
  text-transform:uppercase;color:#fff;background:var(--brand);
  min-height:48px;border:1px solid var(--brand);border-radius:var(--radius-sm);padding:12px 22px;cursor:pointer;
}
.sub-row button:hover{background:var(--brand-hover);border-color:var(--brand-hover)}
.sub-row button[disabled]{opacity:.65;cursor:wait}
.sub-row button.is-success{opacity:1;cursor:default;background:var(--success);border-color:var(--success)}
.form-status{min-height:0;margin:10px 0 0;font:600 13px/1.5 var(--mono);color:var(--muted)}
.form-status:empty{margin:0}
.form-status[data-state="error"]{color:var(--error)}
.form-status[data-state="success"]{color:var(--success)}
.form-status[data-state="progress"]{color:var(--muted)}
.soft-cta{margin:20px 0 0;text-align:center;font-size:15px}
.soft-cta a,.text-action{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:8px 4px;color:var(--brand-hover);font-weight:700;text-decoration:underline;text-underline-offset:4px}
.share-row{display:flex;justify-content:center;gap:18px;flex-wrap:wrap;margin-top:12px}
.text-action{border:0;background:transparent;font:700 12px var(--mono);cursor:pointer;color:var(--brand-hover)}
@media (max-width:480px){.subscribe{padding:20px 18px}.sub-row button{flex:1 1 100%}}

/* ============ compact publication footer (shared, no disclaimer copy) ============ */
.site-footer{margin-top:var(--space-12);padding-top:var(--space-6);border-top:1px solid var(--divider)}
.site-footer .footer-row{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:16px}
.site-footer .footer-brand{margin:0;font-family:var(--display);font-weight:600;font-size:15px;color:var(--ink)}
.site-footer .footer-nav{display:flex;flex-wrap:wrap;gap:8px 20px;list-style:none;margin:0;padding:0}
.site-footer .footer-nav a{display:inline-flex;align-items:center;min-height:44px;padding:4px 0;font:500 13px/1.4 var(--sans);color:var(--muted);text-decoration:none}
.site-footer .footer-nav a:hover{color:var(--brand-hover);text-decoration:underline}
@media (max-width:480px){.site-footer .footer-row{flex-direction:column;align-items:flex-start;gap:12px}}

/* ============ reduced motion ============ */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.01ms!important;
    animation-iteration-count:1!important;
    transition-duration:.01ms!important;
  }
}