:root {
    --ink:        #0d1420;
    --ink-2:      #111b2b;
    --panel:      #16223580;
    --panel-solid:#152032;
    --line:       #24344b;
    --line-soft:  #1c2a3e;
    --text:       #e6edf6;
    --text-dim:   #93a4bd;
    --text-faint: #5f7089;
    --accent:     #4db8ff;
    --accent-2:   #7a89ff;
    --accent-warm:#ffb454;
    --ok:         #56d19a;
    --radius:     4px;
    --maxw:       1080px;
  }

  * { box-sizing: border-box; margin: 0; padding: 0; }

  html { scroll-behavior: smooth; }
  @media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    *, *::before, *::after { animation-duration: .001ms !important; transition-duration: .001ms !important; }
  }

  body {
    background:
      radial-gradient(1100px 640px at 82% -8%, #16294122 0%, transparent 60%),
      radial-gradient(900px 520px at -5% 20%, #1a1f4a1f 0%, transparent 55%),
      var(--ink);
    color: var(--text);
    font-family: 'Inter', system-ui, sans-serif;
    font-weight: 450;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    letter-spacing: -0.005em;
  }

  a { color: inherit; text-decoration: none; }

  .wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 28px; }

  .mono {
    font-family: 'JetBrains Mono', monospace;
    font-weight: 500;
    letter-spacing: 0;
  }

  .eyebrow {
    font-family: 'JetBrains Mono', monospace;
    font-size: 12px;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--accent);
    display: inline-flex;
    align-items: center;
    gap: 10px;
  }
  .eyebrow::before {
    content: "";
    width: 22px; height: 1px;
    background: var(--accent);
    opacity: .7;
  }

  /* ---------- top nav ---------- */
  header.nav {
    position: sticky; top: 0; z-index: 50;
    backdrop-filter: blur(10px);
    background: #0d1420cc;
    border-bottom: 1px solid var(--line-soft);
  }
  .nav-inner {
    display: flex; align-items: center; justify-content: space-between;
    height: 62px;
  }
  .brand {
    font-family: 'Space Grotesk', sans-serif;
    font-weight: 600; font-size: 16px;
    letter-spacing: -0.01em;
    display: flex; align-items: center; gap: 10px;
  }
  .brand .dot { color: var(--accent); }
  .brand .sig {
    font-family: 'JetBrains Mono', monospace;
    color: var(--text-faint);
    font-size: 12.5px;
    font-weight: 400;
  }
  nav.links { display: flex; gap: 4px; }
  nav.links a {
    font-family: 'JetBrains Mono', monospace;
    font-size: 13px;
    color: var(--text-dim);
    padding: 8px 12px;
    border-radius: var(--radius);
    transition: color .18s, background .18s;
  }
  nav.links a:hover { color: var(--text); background: #ffffff08; }
  nav.links a .hash { color: var(--accent); opacity: .6; }
  @media (max-width: 720px) { nav.links { display: none; } }

  /* ---------- hero ---------- */
  .hero { padding: 92px 0 64px; position: relative; }
  .hero-grid {
    display: grid;
    grid-template-columns: 1.35fr 1fr;
    gap: 48px;
    align-items: start;
  }
  @media (max-width: 860px) { .hero-grid { grid-template-columns: 1fr; gap: 34px; } }

  .hero h1 {
    font-family: 'Space Grotesk', sans-serif;
    font-weight: 600;
    font-size: clamp(38px, 6vw, 66px);
    line-height: 1.02;
    letter-spacing: -0.03em;
    margin: 20px 0 0;
  }
  .hero h1 .accent { color: var(--accent); }
  .role {
    font-family: 'JetBrains Mono', monospace;
    font-size: clamp(14px, 2vw, 17px);
    color: var(--text-dim);
    margin-top: 20px;
    letter-spacing: 0;
  }
  .role .brace { color: var(--accent-2); }
  .lede {
    color: var(--text-dim);
    font-size: 17px;
    line-height: 1.62;
    margin-top: 24px;
    max-width: 40ch;
  }
  .lede strong { color: var(--text); font-weight: 600; }

  .cta-row { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }
  .btn {
    font-family: 'JetBrains Mono', monospace;
    font-size: 13.5px;
    padding: 11px 18px;
    border-radius: var(--radius);
    border: 1px solid var(--line);
    display: inline-flex; align-items: center; gap: 9px;
    transition: border-color .18s, background .18s, transform .18s, color .18s;
  }
  .btn:hover { transform: translateY(-2px); }
  .btn.primary {
    background: var(--accent);
    color: #05121e;
    border-color: var(--accent);
    font-weight: 600;
  }
  .btn.primary:hover { background: #6ac6ff; box-shadow: 0 8px 26px -12px var(--accent); }
  .btn.ghost:hover { border-color: var(--accent); color: #fff; background: #4db8ff10; }
  .btn svg { width: 15px; height: 15px; }

  /* hero side card: architecture stack */
  .stack-card {
    border: 1px solid var(--line);
    border-radius: 8px;
    background:
      linear-gradient(180deg, #14203288, #0f18268c);
    overflow: hidden;
  }
  .stack-head {
    display: flex; align-items: center; gap: 8px;
    padding: 12px 14px;
    border-bottom: 1px solid var(--line-soft);
    font-family: 'JetBrains Mono', monospace;
    font-size: 12px;
    color: var(--text-faint);
  }
  .stack-head .win { width: 11px; height: 11px; border-radius: 50%; background: #263651; }
  .stack-head .win:nth-child(1){ background:#33445f; }
  .stack-head .title { margin-left: 6px; }
  .stack-body { padding: 8px; display: flex; flex-direction: column; gap: 7px; }
  .layer {
    display: flex; align-items: center; justify-content: space-between;
    padding: 12px 14px;
    border: 1px solid var(--line-soft);
    border-radius: var(--radius);
    background: #0e1a2a;
    font-family: 'JetBrains Mono', monospace;
    font-size: 12.5px;
    position: relative;
    transition: transform .2s, border-color .2s;
  }
  .layer:hover { transform: translateX(4px); border-color: var(--accent); }
  .layer .lname { color: var(--text); }
  .layer .ltag { color: var(--text-faint); font-size: 11px; }
  .layer.l1 { border-left: 2px solid var(--accent); }
  .layer.l2 { border-left: 2px solid var(--accent-2); }
  .layer.l3 { border-left: 2px solid var(--ok); }
  .layer.l4 { border-left: 2px solid var(--accent-warm); }
  .arrow { text-align: center; color: var(--text-faint); font-size: 11px; line-height: .6; }

  /* ---------- section frame ---------- */
  section { padding: 70px 0; border-top: 1px solid var(--line-soft); }
  .sec-head { display: flex; align-items: baseline; gap: 16px; margin-bottom: 40px; flex-wrap: wrap; }
  .sec-head h2 {
    font-family: 'Space Grotesk', sans-serif;
    font-weight: 600;
    font-size: clamp(26px, 3.6vw, 36px);
    letter-spacing: -0.02em;
  }
  .sec-num {
    font-family: 'JetBrains Mono', monospace;
    font-size: 13px;
    color: var(--accent);
    align-self: center;
  }

  /* ---------- stats ---------- */
  .stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; border: 1px solid var(--line-soft); border-radius: 8px; overflow: hidden; }
  @media (max-width: 700px){ .stats { grid-template-columns: repeat(2,1fr); } }
  .stat { padding: 26px 22px; border-right: 1px solid var(--line-soft); background: #101a2960; }
  .stat:last-child { border-right: none; }
  @media (max-width: 700px){ .stat:nth-child(2){ border-right:none; } .stat:nth-child(1),.stat:nth-child(2){ border-bottom:1px solid var(--line-soft);} }
  .stat .num { font-family: 'Space Grotesk', sans-serif; font-size: 34px; font-weight: 600; letter-spacing: -0.02em; color: #fff; }
  .stat .num .u { color: var(--accent); font-size: 22px; }
  .stat .lbl { font-family: 'JetBrains Mono', monospace; font-size: 11.5px; color: var(--text-dim); margin-top: 6px; letter-spacing: 0.02em; }

  /* ---------- projects ---------- */
  .projects { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
  @media (max-width: 780px){ .projects { grid-template-columns: 1fr; } }
  .project {
    border: 1px solid var(--line);
    border-radius: 8px;
    background: linear-gradient(180deg, #13203288, #0e1826aa);
    padding: 24px;
    display: flex; flex-direction: column;
    transition: transform .22s, border-color .22s, box-shadow .22s;
    position: relative; overflow: hidden;
  }
  .project::after {
    content:""; position:absolute; inset:0 0 auto 0; height:2px;
    background: linear-gradient(90deg, var(--accent), transparent);
    opacity:.0; transition: opacity .25s;
  }
  .project:hover { transform: translateY(-4px); border-color: var(--accent); box-shadow: 0 20px 40px -24px #000; }
  .project:hover::after { opacity:.9; }
  .p-top { display:flex; align-items:center; justify-content: space-between; margin-bottom: 14px; }
  .p-kind { font-family:'JetBrains Mono',monospace; font-size: 11px; letter-spacing:.08em; text-transform:uppercase; color: var(--accent); }
  .p-kind.friend { color: var(--accent-warm); }
  .p-live { font-family:'JetBrains Mono',monospace; font-size:11px; color: var(--ok); display:flex; align-items:center; gap:6px; }
  .p-live .pulse { width:7px; height:7px; border-radius:50%; background: var(--ok); box-shadow:0 0 0 0 #56d19a80; animation: pulse 2.4s infinite; }
  @keyframes pulse { 0%{ box-shadow:0 0 0 0 #56d19a66;} 70%{ box-shadow:0 0 0 7px #56d19a00;} 100%{ box-shadow:0 0 0 0 #56d19a00;} }
  .project h3 { font-family:'Space Grotesk',sans-serif; font-size: 22px; font-weight:600; letter-spacing:-0.02em; }
  .project h3 .host { font-family:'JetBrains Mono',monospace; font-size:12px; color: var(--text-faint); font-weight:400; display:block; margin-top:4px; }
  .project p { color: var(--text-dim); font-size: 14.5px; margin: 14px 0 18px; line-height: 1.6; }
  .p-tags { display:flex; flex-wrap:wrap; gap:6px; margin-top:auto; }
  .tag { font-family:'JetBrains Mono',monospace; font-size:11px; color: var(--text-dim); border:1px solid var(--line-soft); border-radius: 3px; padding: 3px 8px; background:#0e1a2a; }
  .p-visit { margin-top:18px; font-family:'JetBrains Mono',monospace; font-size:13px; color: var(--accent); display:inline-flex; align-items:center; gap:7px; }
  .p-visit svg { width:14px; height:14px; transition: transform .2s; }
  .project:hover .p-visit svg { transform: translate(2px,-2px); }

  /* ---------- experience timeline ---------- */
  .timeline { position: relative; }
  .job {
    display: grid;
    grid-template-columns: 150px 1fr;
    gap: 28px;
    padding: 24px 0;
    border-top: 1px solid var(--line-soft);
  }
  .job:first-child { border-top: none; }
  @media (max-width: 720px){ .job { grid-template-columns: 1fr; gap: 10px; } }
  .job-when { font-family:'JetBrains Mono',monospace; font-size:12.5px; color: var(--accent); padding-top: 3px; }
  .job-when .co { display:block; color: var(--text-faint); margin-top:4px; font-size:11.5px; }
  .job-body h3 { font-family:'Space Grotesk',sans-serif; font-size: 19px; font-weight:600; letter-spacing:-0.015em; }
  .job-body .org { color: var(--text-dim); font-size: 14px; margin: 2px 0 12px; }
  .job-body .org .sep { color: var(--line); margin: 0 8px; }
  .job-body ul { list-style: none; display: flex; flex-direction: column; gap: 8px; }
  .job-body li { position: relative; padding-left: 20px; color: var(--text-dim); font-size: 14.5px; line-height: 1.55; }
  .job-body li::before { content:"›"; position:absolute; left:2px; top:-1px; color: var(--accent); font-family:'JetBrains Mono',monospace; }
  .job-body li strong { color: var(--text); font-weight:600; }

  /* ---------- skills ---------- */
  .skills-grid { display:grid; grid-template-columns: repeat(3,1fr); gap: 16px; }
  @media (max-width: 820px){ .skills-grid { grid-template-columns: 1fr 1fr; } }
  @media (max-width: 540px){ .skills-grid { grid-template-columns: 1fr; } }
  .skill-card { border:1px solid var(--line-soft); border-radius: 8px; padding: 20px; background:#101a2955; }
  .skill-card h4 { font-family:'JetBrains Mono',monospace; font-size:12px; letter-spacing:.08em; text-transform:uppercase; color: var(--accent); margin-bottom: 14px; display:flex; align-items:center; gap:8px; }
  .skill-card h4 .idx { color: var(--text-faint); }
  .chips { display:flex; flex-wrap:wrap; gap:7px; }
  .chip { font-family:'JetBrains Mono',monospace; font-size:12px; color: var(--text); border:1px solid var(--line); border-radius:3px; padding: 4px 9px; background:#0e1a2a; transition: border-color .18s, color .18s; }
  .chip:hover { border-color: var(--accent); color: var(--accent); }

  /* ---------- education ---------- */
  .edu-grid { display:grid; grid-template-columns: 1fr 1fr; gap: 16px; }
  @media (max-width:640px){ .edu-grid { grid-template-columns: 1fr; } }
  .edu { border:1px solid var(--line-soft); border-radius:8px; padding:22px; background:#101a2955; }
  .edu .yr { font-family:'JetBrains Mono',monospace; font-size:12px; color: var(--accent); }
  .edu h4 { font-family:'Space Grotesk',sans-serif; font-size:18px; font-weight:600; margin:8px 0 4px; letter-spacing:-0.015em; }
  .edu .uni { color: var(--text-dim); font-size:14px; }
  .edu .spec { color: var(--text-faint); font-size:13px; margin-top:8px; font-family:'JetBrains Mono',monospace; }

  /* ---------- languages row ---------- */
  .langs { display:flex; flex-wrap:wrap; gap: 24px; margin-top: 26px; }
  .lang { font-family:'JetBrains Mono',monospace; font-size:13.5px; color: var(--text-dim); }
  .lang b { color: var(--text); }
  .lang .lvl { color: var(--accent); }

  /* ---------- contact ---------- */
  .contact { text-align:center; padding: 84px 0 96px; }
  .contact h2 { font-family:'Space Grotesk',sans-serif; font-size: clamp(30px,5vw,52px); font-weight:600; letter-spacing:-0.025em; }
  .contact h2 .accent { color: var(--accent); }
  .contact p { color: var(--text-dim); max-width: 46ch; margin: 18px auto 0; font-size: 16px; }
  .contact .cta-row { justify-content:center; }

  footer { border-top:1px solid var(--line-soft); padding: 28px 0; }
  .foot-inner { display:flex; justify-content:space-between; align-items:center; flex-wrap:wrap; gap:14px; font-family:'JetBrains Mono',monospace; font-size:12px; color: var(--text-faint); }
  .foot-inner a:hover { color: var(--accent); }

  /* reveal */
  .reveal { opacity: 0; transform: translateY(18px); transition: opacity .6s ease, transform .6s ease; }
  .reveal.in { opacity: 1; transform: none; }
  @media (prefers-reduced-motion: reduce){ .reveal { opacity:1; transform:none; } }

  ::selection { background: var(--accent); color: #05121e; }

  /* ---------- language switcher ---------- */
  .lang-switch { display: flex; gap: 2px; align-items: center; margin-left: 14px; }
  .lang-switch a {
    font-family: 'JetBrains Mono', monospace;
    font-size: 12px;
    color: var(--text-faint);
    padding: 5px 9px;
    border-radius: var(--radius);
    border: 1px solid transparent;
    transition: color .18s, border-color .18s, background .18s;
  }
  .lang-switch a:hover { color: var(--text); background: #ffffff08; }
  .lang-switch a.active { color: var(--accent); border-color: var(--line); background: #4db8ff10; }
  .lang-switch .divider { color: var(--line); font-size: 12px; }