:root{
    --bg: #0b1f2e;
    --bg-panel: #0f2839;
    --bg-panel-2: #123047;
    --line: #23445a;
    --line-soft: rgba(111,211,199,0.16);
    --accent: #6fd3c7;
    --accent-dim: #4a9c93;
    --warn: #f2a65a;
    --text: #eaf2f5;
    --text-muted: #94aebb;
    --text-faint: #5f7a87;
    --radius: 3px;
    --maxw: 980px;
  }

  *{ box-sizing: border-box; }
  html{ scroll-behavior: smooth; }
  body{
    margin:0;
    background: var(--bg);
    color: var(--text);
    font-family: 'IBM Plex Sans', sans-serif;
    line-height: 1.6;
    position: relative;
  }

  /* blueprint grid backdrop */
  body::before{
    content:"";
    position: fixed;
    inset: 0;
    background-image:
      linear-gradient(var(--line-soft) 1px, transparent 1px),
      linear-gradient(90deg, var(--line-soft) 1px, transparent 1px);
    background-size: 42px 42px;
    pointer-events: none;
    z-index: 0;
    mask-image: radial-gradient(ellipse 100% 60% at 50% 0%, black 0%, transparent 75%);
  }

  a{ color: var(--accent); text-decoration: none; }
  a:hover{ text-decoration: underline; }

  ::selection{ background: var(--accent); color: #05161f; }

  :focus-visible{
    outline: 2px solid var(--accent);
    outline-offset: 3px;
  }

  .wrap{ max-width: var(--maxw); margin: 0 auto; padding: 0 28px; position: relative; z-index: 1; }

  .eyebrow{
    font-family: 'IBM Plex Mono', monospace;
    font-size: 12px;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--accent);
    display: flex;
    align-items: center;
    gap: 10px;
  }
  .eyebrow::before{
    content:"";
    width: 18px; height: 1px;
    background: var(--accent);
    display: inline-block;
  }

  h1,h2,h3{
    font-family: 'Space Grotesk', sans-serif;
    font-weight: 600;
    margin: 0;
    letter-spacing: -0.01em;
  }

  /* ===== NAV ===== */
  nav{
    position: sticky; top:0; z-index: 10;
    background: rgba(11,31,46,0.86);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--line);
  }
  nav .wrap{
    display:flex; align-items:center; justify-content: space-between;
    padding-top: 16px; padding-bottom: 16px;
  }
  .nav-name{
    font-family:'IBM Plex Mono', monospace;
    font-size: 13px;
    color: var(--text-muted);
  }
  .nav-name b{ color: var(--text); font-weight: 600; }
  .nav-links{ display:flex; gap: 26px; list-style:none; margin:0; padding:0; }
  .nav-links a{
    font-family:'IBM Plex Mono', monospace;
    font-size: 12px;
    color: var(--text-muted);
    letter-spacing: 0.06em;
    text-transform: uppercase;
  }
  .nav-links a:hover{ color: var(--accent); text-decoration:none; }
  @media (max-width:700px){ .nav-links{ display:none; } }

  /* ===== HERO ===== */
  .hero{
    padding: 110px 0 90px;
    position: relative;
  }
  .corner{
    position:absolute; width:22px; height:22px;
    border: 1px solid var(--line);
  }
  .corner.tl{ top:0; left:0; border-right:none; border-bottom:none; }
  .corner.tr{ top:0; right:0; border-left:none; border-bottom:none; }
  .hero .frame{ position:relative; padding: 40px clamp(20px,4vw,56px); border: 1px solid var(--line); }

  .hero h1{
    font-size: clamp(40px, 6vw, 68px);
    line-height: 1.02;
    margin-top: 18px;
  }
  .hero .role{
    font-family:'IBM Plex Mono', monospace;
    color: var(--accent);
    font-size: 15px;
    margin-top: 14px;
    letter-spacing: 0.02em;
  }
  .hero p.lede{
    max-width: 620px;
    color: var(--text-muted);
    font-size: 16.5px;
    margin-top: 22px;
  }

  .readout{
    margin-top: 34px;
    display: grid;
    grid-template-columns: repeat(auto-fit,minmax(140px,1fr));
    gap: 1px;
    background: var(--line);
    border: 1px solid var(--line);
  }
  .readout div{
    background: var(--bg-panel);
    padding: 14px 16px;
  }
  .readout .k{
    font-family:'IBM Plex Mono', monospace;
    font-size: 10.5px;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-faint);
  }
  .readout .v{
    font-family:'IBM Plex Mono', monospace;
    font-size: 13.5px;
    color: var(--text);
    margin-top: 4px;
  }

  .hero .links{
    margin-top: 30px;
    display:flex; flex-wrap: wrap; gap: 12px;
  }
  .btn{
    font-family:'IBM Plex Mono', monospace;
    font-size: 12.5px;
    padding: 10px 16px;
    border: 1px solid var(--accent-dim);
    color: var(--text);
    letter-spacing: 0.03em;
    transition: all .15s ease;
  }
  .btn:hover{
    text-decoration:none;
    background: var(--accent);
    color: #05161f;
    border-color: var(--accent);
  }
  .btn.ghost{ border-color: var(--line); color: var(--text-muted); }
  .btn.ghost:hover{ background: transparent; color: var(--accent); border-color: var(--accent); }

  /* ===== SECTION shell ===== */
  section{ padding: 78px 0; border-top: 1px solid var(--line); position: relative; }
  section .head{ margin-bottom: 40px; }
  section h2{ font-size: 28px; margin-top: 10px; }
  section .intro{ color: var(--text-muted); max-width: 620px; margin-top: 10px; font-size: 15px;}

  /* ===== ABOUT ===== */
  .about-grid{
    display:grid; grid-template-columns: 1.3fr 1fr; gap: 48px;
  }
  @media (max-width:760px){ .about-grid{ grid-template-columns: 1fr; } }
  .about-grid p{ color: var(--text-muted); font-size: 15.5px; }
  .about-grid p + p{ margin-top: 14px; }
  .honors{
    border: 1px solid var(--line);
    background: var(--bg-panel);
    padding: 20px 22px;
  }
  .honors .k{
    font-family:'IBM Plex Mono', monospace;
    font-size: 10.5px; letter-spacing:0.1em; text-transform: uppercase; color: var(--accent);
  }
  .honors ul{ margin: 12px 0 0; padding-left: 18px; color: var(--text); font-size: 14px; }
  .honors li{ margin-bottom: 7px; color: var(--text-muted); }
  .honors li b{ color: var(--text); font-weight: 500; }

  /* ===== EXPERIENCE timeline ===== */
  .timeline{ position: relative; padding-left: 30px; }
  .timeline::before{
    content:"";
    position:absolute; left: 5px; top: 6px; bottom: 6px;
    width: 1px; background: linear-gradient(var(--accent), var(--line) 85%);
  }
  .tl-item{ position: relative; padding-bottom: 44px; }
  .tl-item:last-child{ padding-bottom: 0; }
  .tl-item::before{
    content:"";
    position: absolute; left: -30px; top: 5px;
    width: 11px; height: 11px; border-radius: 50%;
    background: var(--bg);
    border: 2px solid var(--accent);
  }
  .tl-head{
    display:flex; justify-content: space-between; flex-wrap: wrap; gap: 8px 16px;
    align-items: baseline;
  }
  .tl-role{ font-family:'Space Grotesk', sans-serif; font-weight:600; font-size: 18px; }
  .tl-org{ color: var(--accent); font-size: 14.5px; margin-top: 2px; }
  .tl-meta{
    font-family:'IBM Plex Mono', monospace;
    font-size: 11.5px; color: var(--text-faint); text-align:right; white-space: nowrap;
  }
  .tl-item ul{ margin: 12px 0 0; padding-left: 18px; color: var(--text-muted); font-size: 14.5px; }
  .tl-item li{ margin-bottom: 6px; }

  /* ===== PROJECTS ===== */
  .proj-grid{
    display:grid; grid-template-columns: repeat(3,1fr); gap: 1px;
    background: var(--line); border: 1px solid var(--line);
  }
  @media (max-width:820px){ .proj-grid{ grid-template-columns: 1fr; } }
  .proj-card{
    background: var(--bg-panel);
    padding: 26px 24px;
    display:flex; flex-direction: column;
  }
  .proj-num{
    font-family:'IBM Plex Mono', monospace;
    font-size: 11px; color: var(--text-faint); letter-spacing: 0.08em;
  }
  .proj-card h3{ font-size: 17.5px; margin-top: 10px; }
  .proj-card p{ color: var(--text-muted); font-size: 14px; margin-top: 10px; flex-grow:1; }
  .tags{ margin-top: 16px; display:flex; flex-wrap: wrap; gap: 6px; }
  .tag{
    font-family:'IBM Plex Mono', monospace;
    font-size: 10.5px;
    color: var(--accent);
    border: 1px solid var(--accent-dim);
    padding: 3px 8px;
    letter-spacing: 0.02em;
  }

  /* ===== SKILLS ===== */
  .skills-grid{
    display:grid; grid-template-columns: repeat(2,1fr); gap: 22px 40px;
  }
  @media (max-width:700px){ .skills-grid{ grid-template-columns: 1fr; } }
  .skill-cat .k{
    font-family:'IBM Plex Mono', monospace;
    font-size: 11px; text-transform: uppercase; letter-spacing: 0.1em; color: var(--accent);
    border-bottom: 1px solid var(--line); padding-bottom: 8px; margin-bottom: 12px;
  }
  .chip-row{ display:flex; flex-wrap:wrap; gap: 8px; }
  .chip{
    font-size: 13px; color: var(--text);
    background: var(--bg-panel-2);
    border: 1px solid var(--line);
    padding: 5px 11px;
    border-radius: var(--radius);
  }

  /* ===== CERTS ===== */
  .cert-row{ display:grid; grid-template-columns: repeat(auto-fit,minmax(220px,1fr)); gap: 1px; background: var(--line); border:1px solid var(--line); }
  .cert{ background: var(--bg-panel); padding: 18px 20px; }
  .cert .name{ font-size: 14px; color: var(--text); font-weight: 500; }
  .cert .org{ font-family:'IBM Plex Mono', monospace; font-size: 11.5px; color: var(--text-faint); margin-top: 4px; }

  /* ===== CONTACT / FOOTER ===== */
  footer{ border-top: 1px solid var(--line); padding: 60px 0 50px; }
  footer h2{ font-size: 26px; }
  footer .intro{ color: var(--text-muted); max-width: 520px; margin-top: 10px; font-size: 15px; }
  .contact-row{ margin-top: 28px; display:flex; flex-wrap:wrap; gap: 14px; }
  .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:'IBM Plex Mono', monospace; font-size: 11.5px; color: var(--text-faint);
  }

  .reveal{ opacity: 0; transform: translateY(14px); transition: opacity .6s ease, transform .6s ease; }
  .reveal.in{ opacity: 1; transform: translateY(0); }
  @media (prefers-reduced-motion: reduce){
    .reveal{ opacity:1; transform:none; transition:none; }
    html{ scroll-behavior: auto; }
  }