:root{
    --bg:#F4F6F5;
    --panel:#FFFFFF;
    --ink:#13201B;
    --ink-soft:#54615B;
    --ink-faint:#8B958F;
    --copper:#E0602A;
    --copper-soft:#F3D9C9;
    --signal:#1E7A5B;
    --signal-soft:#DCEBE3;
    --line:#DADFDB;
    --line-strong:#B7C0BA;
    --mono-bg:#0F1D18;
    --mono-ink:#D9EFE3;
    --radius:2px;
    --maxw:1120px;
  }

  *{box-sizing:border-box;}
  html{scroll-behavior:smooth;}
  @media (prefers-reduced-motion: reduce){
    html{scroll-behavior:auto;}
    *{animation-duration:0.001ms !important; animation-iteration-count:1 !important; transition-duration:0.001ms !important;}
  }

  body{
    margin:0;
    background:var(--bg);
    color:var(--ink);
    font-family:'Inter',sans-serif;
    font-size:16px;
    line-height:1.6;
    background-image:
      linear-gradient(var(--line) 1px, transparent 1px),
      linear-gradient(90deg, var(--line) 1px, transparent 1px);
    background-size:56px 56px;
    background-position:-1px -1px;
    background-attachment:fixed;
  }

  h1,h2,h3{
    font-family:'Space Grotesk',sans-serif;
    margin:0;
    letter-spacing:-0.01em;
  }

  .mono{font-family: 'Inter',sans-serif;}

  a{color:inherit;}
  a:focus-visible, button:focus-visible, .navlink:focus-visible{
    outline:2px solid var(--copper);
    outline-offset:3px;
  }

  .wrap{
    max-width:var(--maxw);
    margin:0 auto;
    padding:0 32px;
  }

  /* ---------- NAV ---------- */
  header{
    position:sticky;
    top:0;
    z-index:50;
    background:rgba(244,246,245,0.88);
    backdrop-filter:blur(8px);
    border-bottom:1px solid var(--line);
  }
  .navrow{
    display:flex;
    align-items:center;
    justify-content:space-between;
    padding:18px 32px;
    max-width:var(--maxw);
    margin:0 auto;
  }
  .brand{
    font-family: 'Inter',sans-serif;
    font-size:14px;
    font-weight:600;
    letter-spacing:0.02em;
  }
  .brand span{color:var(--copper);}
  nav ul{
    display:flex;
    gap:28px;
    list-style:none;
    margin:0;
    padding:0;
  }
  .navlink{
    display:flex;
    align-items:center;
    gap:8px;
    text-decoration:none;
    font-family: 'Inter',sans-serif;
    font-size:12px;
    letter-spacing:0.04em;
    text-transform:uppercase;
    color:var(--ink-soft);
    padding:6px 2px;
    border-bottom:1px solid transparent;
    transition:color .15s ease, border-color .15s ease;
  }
  .navlink:hover{color:var(--ink);}
  .navlink .dot{
    width:6px;height:6px;border-radius:50%;
    background:var(--ink-faint);
    flex-shrink:0;
  }
  .navlink.active{color:var(--ink); border-color:var(--ink);}
  .navlink.active .dot{
    background:var(--signal);
    box-shadow:0 0 0 3px var(--signal-soft);
  }
  .navmobile{display:none;}

  /* ---------- HERO ---------- */
  .hero{
    padding:96px 0 88px;
  }
  .hero-grid{
    display:grid;
    grid-template-columns:1.05fr 0.95fr;
    gap:56px;
    align-items:center;
  }
  .eyebrow{
    font-family: 'Inter',sans-serif;
    font-size:12px;
    letter-spacing:0.12em;
    text-transform:uppercase;
    color:var(--signal);
    display:flex;
    align-items:center;
    gap:10px;
    margin-bottom:18px;
  }
  .eyebrow::before{
    content:"";
    width:8px;height:8px;
    border-radius:50%;
    background:var(--signal);
    box-shadow:0 0 0 4px var(--signal-soft);
  }
  .hero h1{
    font-size:clamp(38px, 5vw, 58px);
    line-height:1.04;
    font-weight:700;
  }
  .hero h1 .last{color:var(--copper);}
  .hero-role{
    margin-top:14px;
    font-family: 'Inter',sans-serif;
    font-size:15px;
    color:var(--ink-soft);
  }
  .hero-summary{
    margin-top:22px;
    max-width:52ch;
    color:var(--ink-soft);
    font-size:15.5px;
  }
  .hero-ctas{
    margin-top:32px;
    display:flex;
    gap:14px;
    flex-wrap:wrap;
  }
  .btn{
    display:inline-flex;
    align-items:center;
    gap:8px;
    padding:12px 20px;
    font-family: 'Inter',sans-serif;
    font-size:13px;
    letter-spacing:0.02em;
    text-decoration:none;
    border-radius:var(--radius);
    border:1px solid var(--ink);
    transition:transform .15s ease, background .15s ease, color .15s ease;
  }
  .btn-solid{
    background:var(--ink);
    color:var(--bg);
  }
  .btn-solid:hover{background:var(--copper); border-color:var(--copper); transform:translateY(-1px);}
  .btn-ghost{
    background:transparent;
    color:var(--ink);
  }
  .btn-ghost:hover{border-color:var(--copper); color:var(--copper); transform:translateY(-1px);}

  /* topology diagram */
  .topo{
    position:relative;
    aspect-ratio:1/1;
    width:100%;
  }
  .topo svg{width:100%; height:100%; overflow:visible;}
  .node-label{
    font-family: 'Inter',sans-serif;
    font-size:10.5px;
    fill:var(--ink-soft);
    letter-spacing:0.02em;
  }
  .node-core-label{
    font-family: 'Inter',sans-serif;
    font-size:13px;
    font-weight:600;
    fill:var(--ink);
  }
  .link{
    stroke:var(--line-strong);
    stroke-width:1.5;
    fill:none;
  }
  .pulse{
    fill:var(--copper);
  }
  .node-ring{
    fill:var(--panel);
    stroke:var(--ink);
    stroke-width:1.5;
  }
  .node-ring-core{
    fill:var(--ink);
    stroke:var(--ink);
  }

  /* ---------- SECTION SHELL ---------- */
  section{
    padding:76px 0;
    border-top:1px solid var(--line);
  }
  .section-head{
    display:flex;
    align-items:baseline;
    justify-content:space-between;
    gap:24px;
    margin-bottom:40px;
    flex-wrap:wrap;
  }
  .section-num{
    font-family: 'Inter',sans-serif;
    font-size:12px;
    color:var(--ink-faint);
    letter-spacing:0.08em;
  }
  .section-title{
    font-size:clamp(24px,3vw,32px);
    font-weight:600;
  }

  /* ---------- ABOUT ---------- */
  .about-grid{
    display:grid;
    grid-template-columns:1.4fr 1fr;
    gap:48px;
  }
  .about-text p{
    color:var(--ink-soft);
    max-width:62ch;
  }
  .about-stats{
    display:grid;
    grid-template-columns:1fr 1fr;
    gap:1px;
    background:var(--line);
    border:1px solid var(--line);
  }
  .stat{
    background:var(--panel);
    padding:20px;
  }
  .stat-num{
    font-family:'Space Grotesk',sans-serif;
    font-size:26px;
    font-weight:700;
    color:var(--copper);
  }
  .stat-label{
    margin-top:4px;
    font-family: 'Inter',sans-serif;
    font-size:11px;
    color:var(--ink-soft);
    letter-spacing:0.03em;
    text-transform:uppercase;
  }

  /* ---------- CERTS ---------- */
  .cert-grid{
    display:grid;
    grid-template-columns:repeat(3,1fr);
    gap:20px;
  }
  .cert-card{
    background:var(--panel);
    border:1px solid var(--line);
    padding:26px;
    position:relative;
    transition:border-color .15s ease, transform .15s ease;
  }
  .cert-card:hover{border-color:var(--ink); transform:translateY(-2px);}
  .cert-status{
    position:absolute;
    top:22px; right:22px;
    display:flex; align-items:center; gap:6px;
    font-family: 'Inter',sans-serif;
    font-size:10px;
    color:var(--signal);
    letter-spacing:0.04em;
  }
  .cert-status .dot{
    width:6px;height:6px;border-radius:50%;
    background:var(--signal);
    box-shadow:0 0 0 3px var(--signal-soft);
  }
  .cert-abbr{
    font-family:'Space Grotesk',sans-serif;
    font-size:15px;
    font-weight:700;
    color:var(--copper);
    letter-spacing:0.04em;
    margin-bottom:14px;
  }
  .cert-name{
    font-size:16px;
    font-weight:600;
    margin-bottom:14px;
    line-height:1.3;
  }
  .cert-id{
    font-family: 'Inter',sans-serif;
    font-size:11px;
    color:var(--ink-faint);
    word-break:break-all;
    border-top:1px dashed var(--line-strong);
    padding-top:12px;
  }
  .cert-id span{color:var(--ink-soft);}

  /* ---------- PROJECTS ---------- */
  .proj{
    border:1px solid var(--line);
    background:var(--panel);
    padding:32px;
    margin-bottom:20px;
  }
  .proj-top{
    display:flex;
    justify-content:space-between;
    align-items:flex-start;
    gap:20px;
    flex-wrap:wrap;
    margin-bottom:16px;
  }
  .proj-title{
    font-size:20px;
    font-weight:600;
  }
  .proj-meta{
    font-family: 'Inter',sans-serif;
    font-size:11px;
    color:var(--ink-faint);
    margin-top:6px;
    letter-spacing:0.02em;
  }
  .proj-link{
    font-family: 'Inter',sans-serif;
    font-size:12px;
    color:var(--signal);
    text-decoration:none;
    border-bottom:1px solid var(--signal-soft);
    white-space:nowrap;
  }
  .proj-link:hover{border-color:var(--signal);}
  .proj ul{
    margin:0 0 18px;
    padding-left:18px;
    color:var(--ink-soft);
    font-size:14.5px;
  }
  .proj ul li{margin-bottom:6px;}
  .tags{
    display:flex;
    flex-wrap:wrap;
    gap:8px;
  }
  .tag{
    font-family: 'Inter',sans-serif;
    font-size:11px;
    padding:5px 10px;
    background:var(--bg);
    border:1px solid var(--line-strong);
    color:var(--ink-soft);
    border-radius:var(--radius);
  }

  /* ---------- SKILLS ---------- */
  .skills-grid{
    display:grid;
    grid-template-columns:repeat(3,1fr);
    gap:1px;
    background:var(--line);
    border:1px solid var(--line);
  }
  .skill-col{
    background:var(--panel);
    padding:26px;
  }
  .skill-col h3{
    font-family: 'Inter',sans-serif;
    font-size:12px;
    letter-spacing:0.06em;
    text-transform:uppercase;
    color:var(--copper);
    margin-bottom:16px;
    padding-bottom:12px;
    border-bottom:1px solid var(--line);
  }
  .skill-col .tags{gap:8px 8px;}

  /* ---------- EDUCATION ---------- */
  .edu-row{
    display:flex;
    justify-content:space-between;
    align-items:baseline;
    flex-wrap:wrap;
    gap:12px;
    border:1px solid var(--line);
    background:var(--panel);
    padding:24px 28px;
  }
  .edu-degree{font-size:17px; font-weight:600;}
  .edu-school{color:var(--ink-soft); font-size:14px; margin-top:4px;}
  .edu-date{
    font-family: 'Inter',sans-serif;
    font-size:12px;
    color:var(--ink-faint);
  }

  /* ---------- CONTACT / FOOTER ---------- */
  footer{
    border-top:1px solid var(--line);
    padding:64px 0 40px;
  }
  .contact-grid{
    display:grid;
    grid-template-columns:1.2fr 1fr;
    gap:40px;
    align-items:start;
  }
  footer h2{
    font-size:clamp(26px,3.4vw,36px);
    font-weight:700;
    max-width:14ch;
  }
  .contact-list{
    list-style:none;
    margin:28px 0 0;
    padding:0;
  }
  .contact-list li{
    display:flex;
    gap:14px;
    padding:14px 0;
    border-bottom:1px solid var(--line);
    font-family: 'Inter',sans-serif;
    font-size:13.5px;
  }
  .contact-list li:first-child{padding-top:0;}
  .contact-list .k{color:var(--ink-faint); width:64px; flex-shrink:0;}
  .contact-list a{text-decoration:none; color:var(--ink); border-bottom:1px solid transparent;}
  .contact-list a:hover{border-color:var(--copper); color:var(--copper);}
  .foot-bottom{
    margin-top:56px;
    padding-top:22px;
    border-top:1px solid var(--line);
    display:flex;
    justify-content:space-between;
    flex-wrap:wrap;
    gap:10px;
    font-family: 'Inter',sans-serif;
    font-size:11.5px;
    color:var(--ink-faint);
  }

  /* ---------- RESPONSIVE ---------- */
  @media (max-width:860px){
    .navrow nav{display:none;}
    .hero-grid{grid-template-columns:1fr; gap:44px;}
    .topo{max-width:420px; margin:0 auto;}
    .about-grid{grid-template-columns:1fr;}
    .cert-grid{grid-template-columns:1fr;}
    .skills-grid{grid-template-columns:1fr;}
    .contact-grid{grid-template-columns:1fr;}
  }
  @media (max-width:560px){
    .wrap, .navrow{padding-left:20px; padding-right:20px;}
    .hero{padding:64px 0 56px;}
    section{padding:56px 0;}
  }