:root{
    --paper: #EEF1F4;
    --card: #FFFFFF;
    --ink: #141B2E;
    --ink-soft: #4C5768;
    --ink-faint: #5F6B7C;
    --teal: #2F6F6B;
    --teal-soft: #E4EEED;
    --amber: #8B6127;
    --amber-soft: #F4E9DA;
    --line: #CBD2D9;
    --line-strong: #858A8F;   /* for UI boundaries + link underlines (1.4.11) */
    --line-soft: #DEE3E8;
    --max: 760px;
  }

  *{ box-sizing: border-box; }
  html{ scroll-behavior: smooth; scroll-padding-top: 88px; }

  /* Screen-reader-only text: present in the accessibility tree, not on screen. */
  .visually-hidden{
    position:absolute; width:1px; height:1px; padding:0; margin:-1px;
    overflow:hidden; clip:rect(0 0 0 0); white-space:nowrap; border:0;
  }
  .skip-link{
    position:absolute; left:8px; top:-56px; z-index:100;
    background: var(--teal); color:#fff;
    font-family:'IBM Plex Mono', monospace; font-size:13px;
    padding:10px 16px; border-radius:4px; text-decoration:none;
    transition: top 120ms ease-out;
  }
  .skip-link:focus{ top:8px; }
  @media (prefers-reduced-motion: reduce){ .skip-link{ transition:none; } }

  body{
    margin:0;
    background: var(--paper);
    color: var(--ink);
    font-family: 'IBM Plex Sans', system-ui, sans-serif;
    font-size: 16px;
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
  }

  a{ color: var(--teal); text-decoration-color: var(--line-strong); text-underline-offset: 3px; }
  a:hover{ text-decoration-color: var(--teal); }
  a:focus-visible, button:focus-visible{ outline: 2px solid var(--teal); outline-offset: 3px; }

  .mono{ font-family: 'IBM Plex Mono', ui-monospace, monospace; }

  header.topbar{
    position: sticky; top:0; z-index: 20;
    backdrop-filter: blur(6px);
    background: rgba(238,241,244,0.97);
    border-bottom: 1px solid var(--line-soft);
  }
  .topbar-inner{
    max-width: 1040px; margin: 0 auto;
    padding: 16px 28px;
    display:flex; align-items:center; justify-content: space-between;
    gap: 20px;
  }
  .brand{
    display: inline-flex; align-items: baseline; gap: 8px;
    font-family:'IBM Plex Mono', monospace;
    font-size: 13px; letter-spacing: 0.04em;
    color: var(--ink-soft);
    text-decoration: none;
    white-space: nowrap;
  }
  .brand b{ color: var(--ink); font-weight: 600; }
  .brand .sep{ color: var(--line); }
  nav.jumplinks{
    display:flex; gap: 22px; flex-wrap: wrap;
    font-family:'IBM Plex Mono', monospace;
    font-size: 12.5px; letter-spacing: 0.03em;
  }
  nav.jumplinks a{ color: var(--ink-soft); text-decoration:none; }
  nav.jumplinks a:hover{ color: var(--teal); }

  main{ max-width: 1040px; margin: 0 auto; padding: 0 28px 80px; }

  section{
    display: grid;
    grid-template-columns: 64px minmax(0,1fr);
    gap: 28px;
    padding-top: 76px;
    scroll-margin-top: 76px;
  }
  section .tag{
    font-family:'IBM Plex Mono', monospace;
    font-size: 12px;
    color: var(--ink-faint);
    padding-top: 6px;
  }
  section .body{
    border-top: 1px solid var(--line-soft);
    padding-top: 22px;
    max-width: var(--max);
  }

  h1,h2,h3{
    font-family: 'Source Serif 4', Georgia, serif;
    font-weight: 600;
    color: var(--ink);
    margin: 0 0 14px;
  }
  h2{ font-size: 26px; letter-spacing: -0.01em; }
  h3{ font-size: 18px; margin-bottom: 6px; }
  p{ margin: 0 0 14px; color: var(--ink-soft); }
  p:last-child{ margin-bottom: 0; }

  .hero{
    padding: 96px 28px 48px;
    max-width: 1040px; margin: 0 auto;
    background: radial-gradient(var(--line-soft) 1px, transparent 1px) 0 0 / 28px 28px;
  }
  .hero .eyebrow{
    font-family:'IBM Plex Mono', monospace;
    font-size: 12.5px;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--teal);
    margin-bottom: 18px;
  }
  .hero h1{
    font-size: clamp(30px, 4.4vw, 44px);
    line-height: 1.12;
    max-width: 18ch;
    letter-spacing: -0.015em;
  }
  .hero .name{
    margin-top: 14px;
    font-family:'IBM Plex Mono', monospace;
    font-size: 13.5px;
    letter-spacing: 0.04em;
    color: var(--ink-soft);
  }
  .hero .byline{
    margin-top: 16px;
    font-size: 17px;
    color: var(--ink-soft);
    max-width: 52ch;
  }
  .hero-actions{
    margin-top: 28px;
    display: flex; flex-wrap: wrap; gap: 12px;
  }
  .btn{
    display: inline-flex; align-items: center;
    font-family:'IBM Plex Mono', monospace;
    font-size: 13px; letter-spacing: 0.02em;
    padding: 10px 16px;
    border-radius: 4px;
    text-decoration: none;
    border: 1px solid transparent;
  }
  .btn-primary{
    background: var(--teal); color: #fff;
  }
  .btn-primary:hover{ filter: brightness(1.05); text-decoration: none; }
  .btn-secondary{
    background: transparent; color: var(--ink);
    border-color: var(--line-strong);
  }
  .btn-secondary:hover{ border-color: var(--teal); color: var(--teal); text-decoration: none; }

  .rule-full{
    margin-top: 56px;
    border: none; border-top: 1px solid var(--line);
  }

  .status{
    display:inline-flex; align-items:center; gap:7px;
    font-family:'IBM Plex Mono', monospace;
    font-size: 11.5px; letter-spacing: 0.04em; text-transform: uppercase;
    padding: 4px 10px 4px 8px;
    border-radius: 100px;
    margin-bottom: 12px;
  }
  .status::before{
    content:""; width:7px; height:7px; border-radius:50%;
  }
  .status.shipped{ background: var(--teal-soft); color: var(--teal); }
  .status.shipped::before{ background: var(--teal); box-shadow: 0 0 0 3px rgba(47,111,107,0.16); }
  .status.active{ background: var(--teal-soft); color: var(--teal); }
  .status.active::before{ background: var(--teal); box-shadow: 0 0 0 3px rgba(47,111,107,0.16); }
  .status.draft{ background: var(--amber-soft); color: var(--amber); }
  .status.draft::before{ background: var(--amber); box-shadow: 0 0 0 3px rgba(168,117,47,0.16); }

  ul.card-list{ list-style:none; margin:0; padding:0; }
  .research-card{
    background: var(--card);
    border: 1px solid var(--line-soft);
    border-radius: 6px;
    padding: 22px 24px;
    margin-bottom: 16px;
  }
  .research-card:last-child{ margin-bottom: 0; }
  .hook{
    font-family: 'Source Serif 4', Georgia, serif;
    font-size: 17px;
    color: var(--ink);
    margin: 0 0 12px;
    line-height: 1.4;
  }
  .meta{
    font-family:'IBM Plex Mono', monospace;
    font-size: 12px;
    color: var(--ink-faint);
    margin: 0 0 14px;
  }
  .cta-row{
    display: flex; flex-wrap: wrap; gap: 10px 16px;
    align-items: center;
    margin-top: 14px;
    padding-top: 14px;
    border-top: 1px solid var(--line-soft);
  }
  .cta-row a{
    font-family:'IBM Plex Mono', monospace;
    font-size: 13px;
    text-decoration: none;
  }
  .cta-row a:hover{ text-decoration: underline; }
  .cta-primary{ font-weight: 600; color: var(--teal); }
  .cta-secondary{ color: var(--ink-soft); }

  .code-inline{
    font-family:'IBM Plex Mono', monospace;
    font-size: 12.5px;
    background: var(--paper);
    border: 1px solid var(--line-soft);
    padding: 2px 7px;
    border-radius: 3px;
    color: var(--ink);
  }

  ol.approach{
    list-style: none; counter-reset: step; margin: 0 0 18px; padding:0;
  }
  ol.approach li{
    counter-increment: step;
    display:grid; grid-template-columns: 26px 1fr; gap: 12px;
    padding: 9px 0;
    border-bottom: 1px solid var(--line-soft);
    color: var(--ink-soft);
  }
  ol.approach li:first-child{ padding-top: 0; }
  ol.approach li:last-child{ border-bottom:none; }
  ol.approach li::before{
    content: counter(step);
    font-family:'IBM Plex Mono', monospace;
    font-size: 12px; color: var(--teal);
  }

  ul.pub-list{ list-style:none; margin:0; padding:0; }
  .pub{
    padding: 18px 0;
    border-bottom: 1px solid var(--line-soft);
  }
  .pub:last-child{ border-bottom: none; }
  .pub .venue{
    font-family:'IBM Plex Mono', monospace;
    font-size: 12px; letter-spacing:0.03em; text-transform: uppercase;
    color: var(--ink-faint);
    margin-bottom: 6px;
  }
  .pub .title{
    font-size: 16.5px; color: var(--ink); font-weight: 500;
  }
  .pub .title a{
    color: var(--ink);
    text-decoration-color: var(--ink-faint);
    text-decoration-thickness: 1px;
  }
  .pub .title a:hover{ text-decoration-color: var(--teal); color: var(--teal); }

  ul.plain{ margin:0; padding:0; list-style:none; }
  ul.plain li{
    position: relative; padding: 8px 0 8px 18px; color: var(--ink-soft);
    border-bottom: 1px solid var(--line-soft);
  }
  ul.plain li:last-child{ border-bottom: none; }
  ul.plain li::before{
    content:"—"; position:absolute; left:0; color: var(--ink-faint);
  }

  .contact-list{ display:flex; flex-direction:column; gap:10px; }
  .contact-list a, .contact-list span{
    font-family:'IBM Plex Mono', monospace; font-size: 14.5px;
  }
  .contact-list .label{ color: var(--ink-faint); display:inline-block; width: 84px; }

  footer{
    max-width: 1040px; margin: 0 auto; padding: 60px 28px 40px;
    display:flex; justify-content: space-between; align-items:center; gap: 16px; flex-wrap: wrap;
    border-top: 1px solid var(--line-soft);
    font-family:'IBM Plex Mono', monospace;
    font-size: 12px; color: var(--ink-faint);
  }

  @media (max-width: 640px){
    section{ grid-template-columns: 1fr; gap: 8px; }
    section .tag{ padding-top:0; }
    nav.jumplinks{
      gap:16px; flex-wrap:nowrap; overflow-x:auto;
      -webkit-overflow-scrolling:touch; scrollbar-width:none;
      max-width:58vw;
    }
    nav.jumplinks::-webkit-scrollbar{ display:none; }
    .hero{ padding-top: 64px; }
    .brand .sep, .brand .desc{ display:none; }
    .contact-list .label{ display:block; width:auto; margin-bottom: 2px; }
  }


  /* Article pages */
  .hero h1.article-title{
    max-width: 28ch;
  }
  .article-meta{
    margin-top: 14px;
    font-family:'IBM Plex Mono', monospace;
    font-size: 13.5px;
    letter-spacing: 0.04em;
    color: var(--ink-soft);
  }
  .article-body strong{
    color: var(--ink);
    font-weight: 600;
  }
  .article-body em{
    font-style: italic;
  }
  .article-body .lede{
    color: var(--ink);
    font-weight: 500;
  }
  ul.checklist{
    list-style: none;
    margin: 0 0 18px;
    padding: 0;
  }
  ul.checklist li{
    padding: 12px 0;
    border-bottom: 1px solid var(--line-soft);
    color: var(--ink-soft);
  }
  ul.checklist li:last-child{ border-bottom: none; }
  .article-disclosure{
    margin-top: 22px;
    padding-top: 18px;
    border-top: 1px solid var(--line-soft);
    color: var(--ink-soft);
    font-size: 15px;
  }
  .article-endnote{
    margin-top: 8px;
    font-size: 15px;
    color: var(--ink-faint);
    font-style: italic;
  }

  @media (prefers-reduced-motion: reduce){
    html{ scroll-behavior:auto; }
  }