:root {
    --bg: #FFFFFF;
    --surface: #FFF3E9;
    --ink: #201A14;
    --orange: #F97316;
    --orange-deep: #C2410C;
    --amber: #FDBA74;
    --muted: #79716A;
    --text-soft: #4B4238;
    --line: #EFE3D6;
    --sans: 'Space Grotesk', system-ui, sans-serif;
    --mono: 'IBM Plex Mono', ui-monospace, monospace;
  }

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

  html { scroll-behavior: smooth; }

  body {
    background: var(--bg);
    color: var(--ink);
    font-family: var(--sans);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
  }

  ::selection { background: var(--orange); color: #fff; }

  a { color: inherit; }

  .wrap {
    max-width: 1080px;
    margin: 0 auto;
    padding: 0 32px;
  }

  /* ---------- NAV ---------- */
  nav {
    position: sticky;
    top: 0;
    z-index: 20;
    background: rgba(255, 255, 255, 0.88);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--line);
  }
  nav .wrap {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 68px;
  }
  .brand {
    font-family: var(--mono);
    font-size: 15px;
    letter-spacing: 0.02em;
    color: var(--ink);
    text-decoration: none;
  }
  .brand span { color: var(--orange); }
  .navlinks {
    display: flex;
    gap: 28px;
    list-style: none;
    font-size: 14px;
    color: var(--muted);
  }
  .navlinks a { text-decoration: none; transition: color 0.15s ease; }
  .navlinks a:hover { color: var(--orange); }

  /* ---------- HERO ---------- */
  .hero {
    position: relative;
    padding: 96px 0 88px;
    overflow: hidden;
    border-bottom: 1px solid var(--line);
    background:
      radial-gradient(ellipse 640px 420px at 82% -10%, rgba(249,115,22,0.14), transparent),
      radial-gradient(ellipse 520px 380px at -5% 100%, rgba(253,186,116,0.22), transparent);
  }
  .hero .wrap {
    display: grid;
    grid-template-columns: 1.15fr 0.85fr;
    gap: 48px;
    align-items: center;
  }
  .hero-tag {
    font-family: var(--mono);
    font-size: 13px;
    color: var(--orange-deep);
    margin-bottom: 20px;
  }
  .hero h1 {
    font-size: clamp(38px, 5.4vw, 58px);
    line-height: 1.06;
    font-weight: 700;
    letter-spacing: -0.01em;
    margin-bottom: 22px;
    background: linear-gradient(100deg, var(--ink) 35%, var(--orange-deep) 75%, var(--orange) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
  }
  .hero p.lede {
    font-size: 18px;
    color: var(--text-soft);
    max-width: 46ch;
    margin-bottom: 32px;
  }
  .hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }
  .btn {
    font-family: var(--sans);
    font-size: 15px;
    font-weight: 600;
    padding: 13px 24px;
    border-radius: 4px;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: transform 0.15s ease, background 0.15s ease;
    border: 1px solid transparent;
  }
  .btn-primary { background: var(--orange); color: #fff; }
  .btn-primary:hover { background: var(--orange-deep); transform: translateY(-1px); }
  .btn-ghost { border-color: var(--line); color: var(--ink); }
  .btn-ghost:hover { border-color: var(--orange); color: var(--orange-deep); }

  /* network topology visual */
  .topo { width: 100%; height: auto; }
  .topo circle.node { fill: var(--surface); stroke: var(--orange); stroke-width: 1.4; }
  .topo circle.node.gold { stroke: var(--orange-deep); }
  .topo circle.core { fill: var(--orange); stroke: var(--orange-deep); }
  .topo line { stroke: var(--line); stroke-width: 1.4; }
  .topo line.active { stroke: var(--orange); stroke-width: 1.6; }
  .topo text { font-family: var(--mono); font-size: 9px; fill: var(--muted); }

  /* ---------- SECTION SHARED ---------- */
  section { padding: 80px 0; border-bottom: 1px solid var(--line); }
  .section-head {
    display: flex;
    align-items: baseline;
    gap: 16px;
    margin-bottom: 40px;
  }
  .section-num {
    font-family: var(--mono);
    font-size: 13px;
    color: var(--orange-deep);
  }
  .section-head h2 {
    font-size: 28px;
    font-weight: 600;
    letter-spacing: -0.01em;
  }
  .section-line {
    flex: 1;
    height: 1px;
    background: var(--line);
  }

  /* ---------- ABOUT ---------- */
  .about-grid {
    display: grid;
    grid-template-columns: 1.3fr 1fr;
    gap: 56px;
  }
  .about-grid p { color: var(--text-soft); font-size: 16px; margin-bottom: 16px; max-width: 58ch; }
  .facts { border-left: 1px solid var(--line); padding-left: 28px; }
  .fact { padding: 14px 0; border-bottom: 1px solid var(--line); }
  .fact:last-child { border-bottom: none; }
  .fact-label { font-family: var(--mono); font-size: 12px; color: var(--muted); margin-bottom: 4px; }
  .fact-value { font-size: 15px; color: var(--ink); }

  /* ---------- SKILLS ---------- */
  .skill-groups {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1px;
    background: var(--line);
    border: 1px solid var(--line);
  }
  .skill-card { background: var(--bg); padding: 28px 26px; }
  .skill-card h3 {
    font-family: var(--mono);
    font-size: 13px;
    margin-bottom: 16px;
    font-weight: 500;
  }
  .skill-card:nth-child(1) h3 { color: var(--orange); }
  .skill-card:nth-child(2) h3 { color: var(--orange-deep); }
  .skill-card:nth-child(3) h3 { color: #EA8A3D; }
  .skill-card ul { list-style: none; }
  .skill-card li {
    font-size: 14.5px;
    color: var(--text-soft);
    padding: 7px 0;
    border-top: 1px dashed var(--line);
  }
  .skill-card li:first-child { border-top: none; }

  /* ---------- EXPERIENCE ---------- */
  .timeline { position: relative; padding-left: 28px; }
  .timeline::before {
    content: '';
    position: absolute;
    left: 5px; top: 6px; bottom: 6px;
    width: 1px;
    background: var(--line);
  }
  .tl-item { position: relative; padding-bottom: 40px; }
  .tl-item:last-child { padding-bottom: 0; }
  .tl-item::before {
    content: '';
    position: absolute;
    left: -28px; top: 4px;
    width: 11px; height: 11px;
    border-radius: 50%;
    background: var(--bg);
    border: 2px solid var(--orange);
  }
  .tl-role { font-size: 18px; font-weight: 600; margin-bottom: 4px; }
  .tl-org { font-family: var(--mono); font-size: 13px; color: var(--orange-deep); margin-bottom: 10px; }
  .tl-desc { color: var(--text-soft); font-size: 15px; max-width: 60ch; }

  /* ---------- EDUCATION ---------- */
  .edu-card {
    border: 1px solid var(--line);
    padding: 28px 30px;
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 24px;
    flex-wrap: wrap;
  }
  .edu-card h3 { font-size: 19px; font-weight: 600; margin-bottom: 6px; }
  .edu-card p { color: var(--muted); font-size: 14.5px; }
  .edu-status {
    font-family: var(--mono);
    font-size: 12px;
    color: var(--orange-deep);
    border: 1px solid rgba(249,115,22,0.35);
    padding: 6px 12px;
    border-radius: 3px;
    white-space: nowrap;
  }

  /* ---------- CONTACT ---------- */
  .contact-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 24px;
  }
  .contact-left h2 { font-size: 30px; font-weight: 600; margin-bottom: 12px; max-width: 20ch; }
  .contact-left p { color: var(--muted); max-width: 44ch; }
  .contact-links { display: flex; flex-direction: column; gap: 10px; align-items: flex-end; }
  .contact-links a {
    font-family: var(--mono);
    font-size: 14.5px;
    text-decoration: none;
    color: var(--ink);
    display: flex;
    align-items: center;
    gap: 8px;
  }
  .contact-links a:hover { color: var(--orange-deep); }

  footer {
    padding: 28px 0;
    text-align: center;
    font-family: var(--mono);
    font-size: 12px;
    color: var(--muted);
  }

  @media (max-width: 760px) {
    .hero .wrap { grid-template-columns: 1fr; }
    .about-grid { grid-template-columns: 1fr; }
    .facts { border-left: none; padding-left: 0; border-top: 1px solid var(--line); padding-top: 20px; }
    .skill-groups { grid-template-columns: 1fr; }
    .navlinks { display: none; }
    .contact-inner { flex-direction: column; align-items: flex-start; }
    .contact-links { align-items: flex-start; }
  }

  @media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    * { transition: none !important; }
  }

  a:focus-visible, .btn:focus-visible { outline: 2px solid var(--orange); outline-offset: 3px; }