:root{
    --bg:#faf9f5;
    --paper:#ffffff;
    --ink:#16302e;
    --ink-soft:#3d5654;
    --teal:#1f6e69;
    --teal-deep:#123f3c;
    --teal-light:#6fbbb5;
    --green:#7cb342;
    --green-soft:#c7e0a3;
    --clay:#e2854b;
    --line:rgba(22,48,46,0.14);
    --line-strong:rgba(22,48,46,0.26);
    --radius:2px;
    --maxw:1180px;
  }

  *{box-sizing:border-box;}
  html{scroll-behavior:smooth;}
  body{
    margin:0;
    background:var(--bg);
    color:var(--ink);
    font-family:'Inter', sans-serif;
    font-size:16px;
    line-height:1.6;
    -webkit-font-smoothing:antialiased;
  }
  h1,h2,h3,.display{
    font-family:'Fraunces', serif;
    font-weight:600;
    letter-spacing:-0.01em;
    color:var(--teal-deep);
    margin:0;
  }
  .mono{ font-family:'JetBrains Mono', monospace; }
  a{color:inherit;}
  img{max-width:100%; display:block;}
  .wrap{max-width:var(--maxw); margin:0 auto; padding:0 32px;}
  @media (max-width:640px){ .wrap{padding:0 20px;} }

  a:focus-visible, button:focus-visible{outline:2px solid var(--teal); outline-offset:3px;}
  @media (prefers-reduced-motion: reduce){
    *{animation-duration:0.001ms !important; transition-duration:0.001ms !important;}
  }

  /* ---------- HEADER ---------- */
  header{
    position:sticky; top:0; z-index:50;
    background:rgba(250,249,245,0.92);
    backdrop-filter:blur(8px);
    border-bottom:1px solid var(--line);
  }
  .nav-row{ display:flex; align-items:center; justify-content:space-between; height:76px; }
  .brand{display:flex; align-items:center; gap:12px; text-decoration:none;}
  .brand img{height:40px; width:auto;}
  .brand-text{display:flex; flex-direction:column; line-height:1.1;}
  .brand-text strong{font-family:'Fraunces', serif; font-size:1.15rem; font-weight:600; color:var(--teal-deep);}
  .brand-text span{font-family:'JetBrains Mono', monospace; font-size:0.62rem; letter-spacing:0.12em; text-transform:uppercase; color:var(--teal-light);}

  nav.main-nav{display:flex; gap:2.2rem; align-items:center;}
  nav.main-nav a{
    text-decoration:none; color:var(--ink-soft); font-size:0.92rem; font-weight:500;
    position:relative; padding:6px 0;
  }
  nav.main-nav a::after{
    content:""; position:absolute; left:0; bottom:0; height:2px; width:0%;
    background:var(--clay); transition:width .25s ease;
  }
  nav.main-nav a:hover::after, nav.main-nav a:focus-visible::after{width:100%;}
  nav.main-nav a.current{color:var(--teal-deep); font-weight:600;}
  nav.main-nav a.current::after{width:100%; background:var(--teal);}

  .menu-toggle{
    display:none; background:none; border:1px solid var(--line-strong); border-radius:var(--radius);
    width:42px; height:42px; cursor:pointer; position:relative;
  }
  .menu-toggle span, .menu-toggle span::before, .menu-toggle span::after{
    content:""; position:absolute; left:11px; width:20px; height:2px; background:var(--teal-deep);
  }
  .menu-toggle span{top:20px;}
  .menu-toggle span::before{top:-6px;}
  .menu-toggle span::after{top:6px;}

  @media (max-width:860px){
    nav.main-nav{
      position:absolute; top:76px; left:0; right:0;
      background:var(--paper); flex-direction:column; align-items:stretch; gap:0;
      border-bottom:1px solid var(--line);
      max-height:0; overflow:hidden; transition:max-height .3s ease;
    }
    nav.main-nav.open{max-height:480px;}
    nav.main-nav a{padding:14px 32px; border-top:1px solid var(--line); font-size:1rem;}
    .menu-toggle{display:block;}
  }

  /* ---------- HERO (compact variant) ---------- */
  .hero{ padding:64px 0 40px; position:relative; overflow:hidden; }
  .hero-grid{ display:grid; grid-template-columns:1.05fr 0.95fr; gap:48px; align-items:center; }
  @media (max-width:900px){
    .hero-grid{grid-template-columns:1fr; gap:32px;}
    .hero-grid > div:first-child{order:1;}
    .hero-art{order:2; max-width:340px; margin:0 auto;}
    .hero-sub{max-width:none;}
    .hero-cta{justify-content:center;}
  }
  @media (max-width:640px){
    .hero{padding:40px 0 24px;}
    .hero-cta{flex-direction:column; align-items:stretch;}
    .hero-cta .btn{justify-content:center;}
  }
  .eyebrow{
    font-family:'JetBrains Mono', monospace; font-size:0.72rem; letter-spacing:0.16em;
    text-transform:uppercase; color:var(--green); font-weight:600; margin-bottom:18px;
    display:flex; align-items:center; gap:10px;
  }
  .eyebrow::before{content:""; width:22px; height:1px; background:var(--green);}
  h1.hero-title{ font-size:clamp(2rem, 4vw, 3.1rem); line-height:1.08; margin-bottom:22px; }
  h1.hero-title em{ font-style:italic; color:var(--teal); }
  .hero-sub{ font-size:1.05rem; color:var(--ink-soft); max-width:46ch; margin-bottom:32px; }
  .hero-cta{display:flex; gap:14px; flex-wrap:wrap;}
  .btn{
    display:inline-flex; align-items:center; gap:8px;
    padding:13px 24px; border-radius:var(--radius);
    font-size:0.94rem; font-weight:600; text-decoration:none;
    border:1px solid transparent; cursor:pointer;
  }
  .btn-primary{background:var(--teal-deep); color:#fff;}
  .btn-primary:hover{background:var(--teal);}
  .btn-ghost{border-color:var(--line-strong); color:var(--teal-deep);}
  .btn-ghost:hover{border-color:var(--teal); background:var(--paper);}
  .hero-art{ position:relative; }
  .hero-art img{width:100%; height:auto;}

  .breath-divider{ width:100%; height:64px; display:block; }

  /* ---------- SECTION SHELL ---------- */
  .section{padding:88px 0;}
  .section-head{max-width:640px; margin-bottom:52px;}
  .section-tag{
    font-family:'JetBrains Mono', monospace; font-size:0.72rem; letter-spacing:0.16em;
    text-transform:uppercase; color:var(--clay); font-weight:600; margin-bottom:14px; display:block;
  }
  .section-head h2{font-size:clamp(1.7rem, 3vw, 2.3rem); margin-bottom:14px;}
  .section-head p{color:var(--ink-soft); font-size:1rem;}

  /* ---------- SPEC (dark band) ---------- */
  .spec-band{ background:var(--teal-deep); color:#f4f4ee; }
  .spec-band .section-tag{color:var(--green-soft);}
  .spec-band .section-head h2{color:#fff;}
  .spec-band .section-head p{color:rgba(244,244,238,0.72);}
  .spec-grid{
    display:grid; grid-template-columns:repeat(3, 1fr); gap:1px;
    background:rgba(255,255,255,0.14); border:1px solid rgba(255,255,255,0.14);
  }
  .spec-card{ background:var(--teal-deep); padding:30px 26px; }
  .spec-card .spec-label{
    font-family:'JetBrains Mono', monospace; font-size:0.68rem; letter-spacing:0.1em;
    text-transform:uppercase; color:rgba(244,244,238,0.55); margin-bottom:10px;
  }
  .spec-card .spec-value{
    font-family:'JetBrains Mono', monospace; font-size:1.28rem; font-weight:600; color:#fff; margin-bottom:8px;
  }
  .spec-card .spec-note{font-size:0.86rem; color:rgba(244,244,238,0.68);}
  @media (max-width:760px){.spec-grid{grid-template-columns:1fr;}}

  /* ---------- APPROACH-STYLE CARDS (software layers) ---------- */
  .approach-grid{ display:grid; grid-template-columns:repeat(2, 1fr); gap:28px; }
  @media (max-width:760px){.approach-grid{grid-template-columns:1fr;}}
  .approach-card{
    padding:28px; background:var(--paper); border:1px solid var(--line); border-radius:var(--radius);
    border-top:3px solid var(--green);
  }
  .approach-card .card-kicker{
    font-family:'JetBrains Mono', monospace; font-size:0.68rem; letter-spacing:0.1em; text-transform:uppercase;
    color:var(--teal-light); margin-bottom:8px; display:block;
  }
  .approach-card h3{font-size:1.05rem; font-family:'Inter',sans-serif; font-weight:600; margin-bottom:10px; color:var(--teal-deep);}
  .approach-card p{font-size:0.92rem; color:var(--ink-soft); margin:0;}

  /* ---------- LAYERED STACK DIAGRAM ---------- */
  .layer-stack{ display:flex; flex-direction:column; gap:1px; background:var(--line); border:1px solid var(--line); }
  .layer-row{
    display:grid; grid-template-columns:150px 1fr; gap:24px; align-items:center;
    background:var(--paper); padding:20px 24px;
  }
  .layer-row .layer-tag{
    font-family:'JetBrains Mono', monospace; font-size:0.72rem; letter-spacing:0.08em; text-transform:uppercase;
    color:var(--teal); font-weight:600;
  }
  .layer-row .layer-body strong{ display:block; color:var(--teal-deep); font-size:0.98rem; margin-bottom:4px; }
  .layer-row .layer-body p{ margin:0; font-size:0.88rem; color:var(--ink-soft); }
  .layer-row .layer-chips{ margin-top:8px; display:flex; flex-wrap:wrap; gap:6px; }
  .chip{
    font-family:'JetBrains Mono', monospace; font-size:0.72rem; padding:4px 9px; border-radius:2px;
    background:var(--green-soft); color:var(--teal-deep); font-weight:600;
  }
  .chip.alt{ background:rgba(31,110,105,0.12); color:var(--teal); }
  @media (max-width:640px){
    .layer-row{grid-template-columns:1fr; gap:8px;}
  }

  /* ---------- LANGUAGE / TOOL TABLE ---------- */
  .stack-table{ width:100%; border-collapse:collapse; background:var(--paper); }
  .stack-table th, .stack-table td{
    text-align:left; padding:14px 18px; border-bottom:1px solid var(--line); font-size:0.92rem;
  }
  .stack-table th{
    font-family:'JetBrains Mono', monospace; font-size:0.68rem; letter-spacing:0.1em; text-transform:uppercase;
    color:var(--teal-light); font-weight:600; border-bottom:1px solid var(--line-strong);
  }
  .stack-table td.role{ color:var(--ink-soft); }
  .stack-table td.name{ font-weight:600; color:var(--teal-deep); }
  .stack-wrap{ overflow-x:auto; border:1px solid var(--line); }
  .stack-wrap .stack-table{ min-width:640px; }

  /* ---------- REPO CARD ---------- */
  .repo-card{
    background:var(--teal-deep); color:#f4f4ee; padding:40px; border-radius:var(--radius);
    display:grid; grid-template-columns:1.3fr 1fr; gap:36px; align-items:center;
  }
  @media (max-width:860px){ .repo-card{grid-template-columns:1fr;} }
  .repo-card h3{ color:#fff; font-size:1.4rem; margin-bottom:10px; }
  .repo-card p{ color:rgba(244,244,238,0.75); font-size:0.95rem; margin-bottom:22px; }
  .repo-badges{ display:flex; gap:8px; flex-wrap:wrap; margin-bottom:22px; }
  .badge{
    font-family:'JetBrains Mono', monospace; font-size:0.68rem; padding:5px 10px; border-radius:2px;
    background:rgba(255,255,255,0.1); color:rgba(244,244,238,0.85); border:1px solid rgba(255,255,255,0.16);
  }
  .code-block{
    background:#0d2624; border:1px solid rgba(255,255,255,0.14); border-radius:2px;
    padding:20px 22px; font-family:'JetBrains Mono', monospace; font-size:0.82rem; color:var(--green-soft);
    overflow-x:auto; white-space:pre;
  }
  .code-block .cmt{ color:rgba(244,244,238,0.45); }
  .repo-card .repo-cta{ display:flex; gap:12px; flex-wrap:wrap; }
  .repo-card .btn-ghost{ border-color:rgba(255,255,255,0.4); color:#fff; }
  .repo-card .btn-ghost:hover{ border-color:#fff; background:rgba(255,255,255,0.06); }
  .repo-card .btn-primary{ background:var(--clay); }
  .repo-card .btn-primary:hover{ background:#c96f38; }
  .repo-note{
    margin-top:18px; font-size:0.82rem; color:var(--ink-soft); background:var(--paper);
    border:1px solid var(--line); border-left:3px solid var(--clay); padding:16px 18px;
  }
  .repo-note strong{ color:var(--teal-deep); display:block; margin-bottom:4px; }

  /* ---------- CLOSING ---------- */
  .closing{ background:var(--teal-deep); color:#fff; padding:90px 0; text-align:center; }
  .closing h2{ color:#fff; font-size:clamp(1.7rem,3.4vw,2.4rem); max-width:20ch; margin:0 auto 20px; }
  .closing p{ color:rgba(244,244,238,0.75); max-width:52ch; margin:0 auto 34px; font-size:1rem; }
  .closing .hero-cta{ justify-content:center; }
  .closing .btn-ghost{ border-color:rgba(255,255,255,0.4); color:#fff; }
  .closing .btn-ghost:hover{ border-color:#fff; background:rgba(255,255,255,0.06); }
  .closing .btn-primary{ background:var(--clay); }
  .closing .btn-primary:hover{ background:#c96f38; }

  footer{ padding:36px 0; border-top:1px solid var(--line); background:var(--bg); }
  .footer-row{ display:flex; justify-content:space-between; align-items:center; flex-wrap:wrap; gap:14px; }
  footer .mono{font-size:0.76rem; color:var(--ink-soft);}
  footer .brand-text span{color:var(--teal-light);}