:root{
    --bg: #0A1D15;
    --bg-2: #0F2A1E;
    --panel: #123425;
    --panel-2: #163C2B;
    --trace: #1E5138;
    --copper: #D8A857;
    --copper-bright: #F0C06E;
    --silk: #EFEEE4;
    --silk-dim: #A9BDAE;
    --muted: #7C9484;
    --signal: #5FD1C0;
    --danger: #E0785A;
    --radius: 3px;
    --maxw: 1120px;
  }
  *{box-sizing:border-box;}
  html{scroll-behavior:smooth;}
  body{
    margin:0;
    background:
      radial-gradient(circle at 15% 8%, rgba(95,209,192,0.06), transparent 40%),
      radial-gradient(circle at 85% 0%, rgba(216,168,87,0.05), transparent 45%),
      var(--bg);
    color:var(--silk);
    font-family:'IBM Plex Sans', sans-serif;
    line-height:1.6;
    -webkit-font-smoothing:antialiased;
    overflow-x:hidden;
  }
  ::selection{ background:var(--copper); color:#0A1D15; }

  /* PCB trace texture */
  .traces{
    position:fixed; inset:0; z-index:0; pointer-events:none; opacity:0.5;
    background-image:
      linear-gradient(var(--trace) 1px, transparent 1px),
      linear-gradient(90deg, var(--trace) 1px, transparent 1px);
    background-size: 64px 64px;
    -webkit-mask-image: linear-gradient(to bottom, black, transparent 90%);
            mask-image: linear-gradient(to bottom, black, transparent 90%);
    opacity:0.08;
  }

  a{color:inherit;}
  a, button, input, textarea{ }
  a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible{
    outline:2px solid var(--copper-bright); outline-offset:3px; border-radius:2px;
  }
  .wrap{max-width:var(--maxw); margin:0 auto; padding:0 28px; position:relative; z-index:1;}

  /* Component designator label — signature element */
  .designator{
    font-family:'IBM Plex Mono', monospace;
    font-size:12px;
    letter-spacing:0.14em;
    color:var(--copper);
    display:inline-flex;
    align-items:center;
    gap:10px;
    margin-bottom:14px;
    text-transform:uppercase;
  }
  .designator::before{
    content:"";
    width:22px; height:1px; background:var(--copper);
    display:inline-block;
  }

  /* Nav */
  header.nav{
    position:sticky; top:0; z-index:50;
    backdrop-filter:blur(10px);
    background:rgba(10,29,21,0.82);
    border-bottom:1px solid var(--trace);
  }
  header.nav::after{
    content:""; position:absolute; left:0; right:0; bottom:-1px; height:1px;
    background:linear-gradient(90deg, transparent, var(--copper) 30%, var(--signal) 70%, transparent);
    opacity:0.55; pointer-events:none;
  }
  .nav-inner{
    max-width:var(--maxw); margin:0 auto; padding:16px 28px;
    display:flex; align-items:center; justify-content:space-between;
    position:relative;
  }
  .brand{
    font-family:'Space Grotesk', sans-serif;
    font-weight:700; font-size:18px; letter-spacing:0.02em;
    display:flex; align-items:center; gap:10px;
  }
  .brand .chip{
    width:12px;height:12px;border:1.5px solid var(--copper);
    position:relative; flex-shrink:0;
  }
  .brand .chip::before,.brand .chip::after{
    content:""; position:absolute; background:var(--copper); width:4px; height:1.5px; top:50%; margin-top:-0.75px;
  }
  .brand .chip::before{ left:-6px; }
  .brand .chip::after{ right:-6px; }
  nav.links{ display:flex; gap:26px; font-size:13px; font-family:'IBM Plex Mono',monospace; letter-spacing:0.04em;}
  nav.links a{ color:var(--silk-dim); text-decoration:none; transition:color .2s; position:relative; padding-bottom:3px; }
  nav.links a::after{
    content:""; position:absolute; left:0; bottom:0; width:0; height:1px;
    background:var(--copper-bright); transition:width .25s ease;
  }
  nav.links a:hover, nav.links a:focus-visible{ color:var(--copper-bright); }
  nav.links a:hover::after, nav.links a:focus-visible::after{ width:100%; }
  .nav-toggle{
    display:none; background:none; border:1px solid var(--trace); color:var(--silk); padding:8px 12px;
    font-family:'IBM Plex Mono',monospace; font-size:18px; line-height:1; cursor:pointer; border-radius:var(--radius);
  }
  .nav-toggle:hover{ border-color:var(--copper); color:var(--copper-bright); }

  /* Hero */
  .hero{
    padding:100px 0 70px;
    display:grid; grid-template-columns:1.15fr 0.85fr; gap:56px; align-items:center;
  }
  .hero h1{
    font-family:'Space Grotesk', sans-serif;
    font-size:clamp(38px, 5.4vw, 62px);
    line-height:1.05; margin:0 0 18px; font-weight:700;
    letter-spacing:-0.01em;
  }
  .hero h1 .last{ color:var(--copper-bright); text-shadow:0 0 40px rgba(240,192,110,0.25); }
  .role-line{
    font-family:'IBM Plex Mono', monospace;
    color:var(--signal);
    font-size:15px; margin:0 0 22px; letter-spacing:0.02em;
  }
  .role-line .sep{ color:var(--muted); margin:0 8px;}
  .hero p.lede{ color:var(--silk-dim); font-size:16.5px; max-width:52ch; margin:0 0 30px;}
  .cta-row{ display:flex; gap:14px; flex-wrap:wrap; }
  .btn{
    font-family:'IBM Plex Mono', monospace; font-size:13px; letter-spacing:0.05em;
    padding:13px 22px; border-radius:var(--radius); text-decoration:none;
    display:inline-flex; align-items:center; gap:10px; transition:transform .15s, background .2s, border-color .2s;
    border:1px solid transparent;
  }
  .btn:hover{ transform:translateY(-2px); }
  .btn-primary{ background:var(--copper); color:#0A1D15; font-weight:600; box-shadow:0 10px 24px -10px rgba(216,168,87,0.55); }
  .btn-primary:hover{ background:var(--copper-bright); box-shadow:0 14px 30px -10px rgba(240,192,110,0.65); }
  .btn-ghost{ border-color:var(--trace); color:var(--silk); }
  .btn-ghost:hover{ border-color:var(--copper); color:var(--copper-bright); }

  .hero-photo{
    position:relative;
    justify-self:center;
  }
  .photo-frame{
    width:280px; height:340px; position:relative;
    border:1px solid var(--trace);
    padding:14px;
    box-shadow: 0 24px 60px -20px rgba(0,0,0,0.55), 0 0 50px -15px rgba(216,168,87,0.18);
  }
  .photo-frame::before, .photo-frame::after{
    content:""; position:absolute; width:16px; height:16px; border:2px solid var(--copper);
  }
  .photo-frame::before{ top:-2px; left:-2px; border-right:none; border-bottom:none; }
  .photo-frame::after{ bottom:-2px; right:-2px; border-left:none; border-top:none; }
  .photo-frame img{ width:100%; height:100%; object-fit:cover; object-position:center 18%; display:block; filter:saturate(0.92) contrast(1.03); border-radius:1px; }
  .photo-tag{
    position:absolute; bottom:-14px; left:50%; transform:translateX(-50%);
    background:var(--bg); border:1px solid var(--copper); color:var(--copper-bright);
    font-family:'IBM Plex Mono', monospace; font-size:11px; padding:5px 12px; letter-spacing:0.08em;
    white-space:nowrap;
  }

  section{ padding:88px 0; position:relative; border-top:1px solid var(--trace); }
  section:first-of-type{border-top:none;}
  .section-head{ margin-bottom:44px; }
  .section-head h2{
    font-family:'Space Grotesk', sans-serif; font-size:clamp(26px,3vw,34px); margin:0 0 8px; font-weight:600;
  }
  .section-head p{ color:var(--muted); margin:0; max-width:60ch; font-size:14.5px;}

  /* About */
  .about-grid{ display:grid; grid-template-columns: 1fr 1fr; gap:48px; }
  .about-grid p{ color:var(--silk-dim); font-size:15.5px; }
  .spec-list{ list-style:none; margin:0; padding:0; font-family:'IBM Plex Mono', monospace; font-size:13px;}
  .spec-list li{ display:flex; justify-content:space-between; padding:11px 0; border-bottom:1px dashed var(--trace); color:var(--silk-dim);}
  .spec-list li span:first-child{ color:var(--muted); }
  .spec-list li span:last-child{ color:var(--silk); text-align:right; }

  /* Skills */
  .skill-groups{ display:grid; grid-template-columns:repeat(2,1fr); gap:16px; align-items:start; }
  .skill-group{ padding:24px 22px; border:1px solid var(--trace); }
  .skill-group h3{
    font-family:'IBM Plex Mono', monospace; font-size:12px; color:var(--copper);
    text-transform:uppercase; letter-spacing:0.08em; margin:0 0 16px;
  }


  /* Timeline (experience) */
  .timeline{ position:relative; padding-left:28px; border-left:1px solid var(--trace); }
  .t-item{ position:relative; padding-bottom:34px; }
  .t-item:last-child{ padding-bottom:0; }
  .t-item::before{
    content:""; position:absolute; left:-33px; top:4px; width:9px; height:9px;
    background:var(--bg); border:2px solid var(--copper); border-radius:50%;
    box-shadow: 0 0 0 4px rgba(216,168,87,0.14);
  }
  .t-date{ font-family:'IBM Plex Mono', monospace; font-size:12px; color:var(--signal); margin-bottom:6px; letter-spacing:0.03em;}
  .t-title{ font-weight:600; font-size:16.5px; margin-bottom:4px; font-family:'Space Grotesk',sans-serif;}
  .t-org{ color:var(--muted); font-size:13.5px; margin-bottom:8px; }
  .t-desc{ color:var(--silk-dim); font-size:14.5px; max-width:60ch; }

  /* Projects */
  .proj-grid{ display:grid; grid-template-columns:repeat(2,1fr); gap:1px; background:var(--trace); border:1px solid var(--trace); }
  .proj-card{ background:var(--panel); padding:26px 26px 24px; position:relative; }
  .proj-id{ font-family:'IBM Plex Mono', monospace; font-size:11px; color:var(--copper); letter-spacing:0.08em; margin-bottom:10px; display:block;}
  .proj-card h3{ font-family:'Space Grotesk', sans-serif; font-size:17px; margin:0 0 10px; font-weight:600; line-height:1.3;}
  .proj-card p{ color:var(--silk-dim); font-size:13.8px; margin:0; }
  .proj-year{ position:absolute; top:24px; right:24px; font-family:'IBM Plex Mono',monospace; font-size:11px; color:var(--muted); }

  /* Publications */
  .pub{ border:1px solid var(--trace); padding:26px 28px; }
  .pub-tag{ font-family:'IBM Plex Mono',monospace; font-size:11px; color:var(--signal); letter-spacing:0.08em; margin-bottom:12px; display:block;}
  .pub p{ margin:0 0 10px; font-size:15px; color:var(--silk); }
  .pub p:last-child{ margin-bottom:0; }
  .pub .cite{ color:var(--silk-dim); font-size:14px; }
  .pub .doi{ color:var(--copper-bright); font-family:'IBM Plex Mono',monospace; font-size:12.5px; text-decoration:none; }
  .pub .doi:hover{ text-decoration:underline; }

  /* Achievements + interests */
  .two-col{ display:grid; grid-template-columns:1.2fr 1fr; gap:48px; }
  .ach-item{ display:flex; gap:16px; padding:16px 0; border-bottom:1px dashed var(--trace); }
  .ach-item:last-child{ border-bottom:none; }
  .ach-year{ font-family:'IBM Plex Mono',monospace; color:var(--copper); font-size:13px; flex-shrink:0; width:46px; }
  .ach-text{ color:var(--silk-dim); font-size:14.5px; }
  .interest-pills{ display:flex; flex-wrap:wrap; gap:10px; align-content:flex-start; }
  .pill{
    border:1px solid var(--trace); padding:9px 16px; font-size:13px; font-family:'IBM Plex Mono',monospace;
    color:var(--silk-dim); border-radius:20px;
  }

  /* Education */
  .edu-list{ display:flex; flex-direction:column; gap:0; border-top:1px solid var(--trace); }
  .edu-row{
    display:grid; grid-template-columns: 110px 1fr; gap:24px; align-items:baseline;
    padding:22px 0; border-bottom:1px solid var(--trace);
  }
  .edu-year{ font-family:'IBM Plex Mono',monospace; color:var(--signal); font-size:13px; }
  .edu-name{ font-weight:600; font-size:16px; font-family:'Space Grotesk',sans-serif; }
  .edu-school{ color:var(--muted); font-size:13.5px; margin-top:3px; }

  /* Contact */
  .contact-panel{
    border:1px solid var(--copper); background:var(--panel); padding:52px;
    display:grid; grid-template-columns:1fr auto; gap:40px; align-items:center;
    box-shadow: 0 30px 70px -35px rgba(216,168,87,0.3);
  }
  .contact-panel h2{ font-family:'Space Grotesk',sans-serif; font-size:clamp(26px,3.4vw,38px); margin:0 0 14px; }
  .contact-panel p{ color:var(--silk-dim); max-width:48ch; margin:0; }
  .contact-list{ list-style:none; margin:0; padding:0; display:flex; flex-direction:column; gap:14px; }
  .contact-list a{ text-decoration:none; color:var(--silk); font-family:'IBM Plex Mono',monospace; font-size:14px; display:flex; align-items:center; gap:10px; flex-wrap:wrap; word-break:break-word; }
  .contact-list a:hover{ color:var(--copper-bright); }
  .contact-list .k{ color:var(--muted); width:64px; flex-shrink:0; font-size:11px; text-transform:uppercase; letter-spacing:0.06em; }

  footer{ padding:36px 0 50px; text-align:center; color:var(--muted); font-family:'IBM Plex Mono',monospace; font-size:12px; }
  footer .tag{ color:var(--copper); }

  @media (max-width: 860px){
    nav.links{
      display:none; position:absolute; top:100%; left:0; right:0;
      flex-direction:column; gap:0; padding:8px 28px 20px;
      background:rgba(10,29,21,0.98); border-bottom:1px solid var(--trace);
      backdrop-filter:blur(10px);
    }
    nav.links.open{ display:flex; }
    nav.links a{ padding:14px 0; border-bottom:1px dashed var(--trace); font-size:14px; }
    nav.links a:last-child{ border-bottom:none; }
    nav.links a::after{ display:none; }
    .nav-toggle{ display:block; }
    .hero{ grid-template-columns:1fr; padding-top:52px; padding-bottom:50px; }
    .hero-photo{ order:-1; }
    .photo-frame{ width:200px; height:240px; }
    .about-grid, .two-col{ grid-template-columns:1fr; }
    .skill-groups{ grid-template-columns:1fr; }
    .proj-grid{ grid-template-columns:1fr; }
    .contact-panel{ grid-template-columns:1fr; padding:34px 26px; text-align:left;}
    .edu-row{ grid-template-columns:1fr; gap:4px; }
    section{ padding:56px 0; }
    .wrap{ padding:0 20px; }
    .nav-inner{ padding:14px 20px; }
  }
  @media (max-width: 480px){
    .cta-row{ flex-direction:column; align-items:stretch; }
    .btn{ justify-content:center; }
    .photo-frame{ width:170px; height:200px; }
    .contact-panel{ padding:26px 18px; }
    .focus-card, .skill-group, .proj-card, .pub, .ref-card, .ach-card{ padding-left:18px; padding-right:18px; }
  }
  @media (prefers-reduced-motion: reduce){
    html{ scroll-behavior:auto; }
    *{ transition:none !important; animation:none !important; }
  }

  .reveal{ opacity:0; transform:translateY(14px); transition:opacity .6s ease, transform .6s ease; }
  .reveal.in{ opacity:1; transform:translateY(0); }

  /* ---------- Card hover lift (Focus, Skills, Projects, Publications, Achievements, References) ---------- */
  .focus-card, .skill-group, .proj-card, .pub, .ach-card, .ref-card{
    transition: transform .28s cubic-bezier(.2,.8,.2,1), box-shadow .28s ease;
  }
  .focus-card:hover, .skill-group:hover, .proj-card:hover, .pub:hover, .ach-card:hover, .ref-card:hover{
    transform: translateY(-5px);
    box-shadow: 0 20px 40px -18px rgba(0,0,0,0.55), inset 0 0 0 1px var(--copper);
    z-index:2;
  }

  /* ---------- Focus Area cards ---------- */
  .focus-grid{ display:grid; grid-template-columns:repeat(4,1fr); gap:1px; background:var(--trace); border:1px solid var(--trace); }
  .focus-card{ background:var(--panel); padding:28px 22px; }
  .focus-id{ font-family:'IBM Plex Mono',monospace; font-size:11px; color:var(--copper); letter-spacing:0.08em; display:block; margin-bottom:14px; }
  .focus-card h3{ font-family:'Space Grotesk',sans-serif; font-size:16px; margin:0 0 8px; font-weight:600; }
  .focus-card p{ color:var(--silk-dim); font-size:13.5px; margin:0; }

  /* ---------- Skill tags ---------- */
  .skill-tags{ display:flex; flex-wrap:wrap; gap:9px; }
  .skill-tag{
    border:1px solid var(--trace); padding:8px 14px; font-size:12.5px; font-family:'IBM Plex Mono',monospace;
    color:var(--silk-dim); border-radius:20px; transition:border-color .2s, color .2s, transform .2s;
  }
  .skill-tag:hover{ border-color:var(--copper); color:var(--copper-bright); transform:translateY(-2px); }

  /* ---------- Project card links ---------- */
  .proj-links{ display:flex; gap:16px; margin-top:14px; }
  .proj-links a{ font-family:'IBM Plex Mono',monospace; font-size:12px; color:var(--signal); text-decoration:none; }
  .proj-links a:hover{ color:var(--copper-bright); text-decoration:underline; }

  /* ---------- Achievement cards ---------- */
  .ach-list-grid{ display:grid; grid-template-columns:1fr 1fr; gap:1px; background:var(--trace); border:1px solid var(--trace); }
  .ach-card{ background:var(--panel); padding:20px 22px; }
  .ach-card .ach-year{ font-family:'IBM Plex Mono',monospace; color:var(--copper); font-size:12px; margin-bottom:8px; }
  .ach-card .ach-text{ color:var(--silk-dim); font-size:14px; }

  /* ---------- Social pills ---------- */
  .social-row{ display:flex; gap:10px; flex-wrap:wrap; margin-top:22px; }
  .social-pill{
    border:1px solid var(--trace); padding:8px 16px; font-size:12.5px; font-family:'IBM Plex Mono',monospace;
    color:var(--silk-dim); text-decoration:none; border-radius:20px; transition:border-color .2s, color .2s, transform .2s;
  }
  .social-pill:hover{ border-color:var(--copper); color:var(--copper-bright); transform:translateY(-2px); }

  /* ---------- Contact form ---------- */
  .contact-form{ display:flex; flex-direction:column; gap:14px; margin-top:26px; max-width:480px; }
  .contact-form input, .contact-form textarea{
    background:var(--bg-2); border:1px solid var(--trace); color:var(--silk);
    font-family:'IBM Plex Sans',sans-serif; font-size:14px; padding:12px 14px; border-radius:var(--radius);
    outline:none; transition:border-color .2s;
  }
  .contact-form input:focus, .contact-form textarea:focus{ border-color:var(--copper); }
  .contact-form textarea{ resize:vertical; min-height:100px; }
  .contact-form button{
    align-self:flex-start; font-family:'IBM Plex Mono',monospace; font-size:13px; letter-spacing:0.05em;
    padding:13px 26px; background:var(--copper); color:#0A1D15; font-weight:600; border:none; border-radius:var(--radius);
    cursor:pointer; transition:background .2s, transform .15s;
  }
  .contact-form button:hover{ background:var(--copper-bright); transform:translateY(-2px); }

  @media (max-width: 860px){
    .focus-grid{ grid-template-columns:1fr 1fr; }
    .ach-list-grid{ grid-template-columns:1fr; }
  }
  @media (max-width: 560px){
    .focus-grid{ grid-template-columns:1fr; }
  }