:root {
    --bg: #f6f7f9;
    --surface: #ffffff;
    --surface-2: #eef1f5;
    --text: #141a22;
    --muted: #5a6573;
    --line: #dce1e8;
    --accent: #0b5cad;
    --accent-2: #e2632b;
    --accent-soft: #e3eefa;
    --grid: rgba(11, 92, 173, .07);
    --shadow: 0 1px 2px rgba(20,26,34,.05), 0 8px 24px rgba(20,26,34,.06);
    color-scheme: light;
  }
  @media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
      --bg: #0d1117;
      --surface: #151b23;
      --surface-2: #1c242e;
      --text: #e7ecf2;
      --muted: #97a3b2;
      --line: #2a3441;
      --accent: #5aa6f0;
      --accent-2: #ff8a52;
      --accent-soft: #172a40;
      --grid: rgba(90, 166, 240, .07);
      --shadow: 0 1px 2px rgba(0,0,0,.3), 0 8px 24px rgba(0,0,0,.25);
      color-scheme: dark;
    }
  }
  :root[data-theme="dark"] {
    --bg: #0d1117;
    --surface: #151b23;
    --surface-2: #1c242e;
    --text: #e7ecf2;
    --muted: #97a3b2;
    --line: #2a3441;
    --accent: #5aa6f0;
    --accent-2: #ff8a52;
    --accent-soft: #172a40;
    --grid: rgba(90, 166, 240, .07);
    --shadow: 0 1px 2px rgba(0,0,0,.3), 0 8px 24px rgba(0,0,0,.25);
    color-scheme: dark;
  }

  * { box-sizing: border-box; }
  html { scroll-behavior: smooth; }
  body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font: 16px/1.6 Inter, system-ui, -apple-system, "Segoe UI", sans-serif;
    -webkit-font-smoothing: antialiased;
  }
  a { color: var(--accent); text-decoration: none; }
  a:hover { text-decoration: underline; }
  h1, h2, h3 { font-family: "Space Grotesk", Inter, sans-serif; line-height: 1.15; margin: 0; }
  .mono { font-family: "JetBrains Mono", ui-monospace, monospace; }
  .wrap { max-width: 1120px; margin: 0 auto; padding: 0 24px; }
  @media (max-width: 600px) { .wrap { padding: 0 16px; } }

  /* Header */
  header.top {
    position: sticky; top: 0; z-index: 10;
    background: color-mix(in srgb, var(--bg) 85%, transparent);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--line);
  }
  .top .wrap { display: flex; align-items: center; justify-content: space-between; height: 64px; gap: 16px; }
  .brand { display: flex; align-items: center; gap: 10px; color: var(--text); font-weight: 600; }
  .brand:hover { text-decoration: none; }
  .brand .logo { flex: none; width: 48px; height: 48px; border-radius: 50%; display: block; }
  .brand .logo-dark { display: none; }
  :root[data-theme="dark"] .brand .logo-light { display: none; }
  :root[data-theme="dark"] .brand .logo-dark { display: block; }
  @media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) .brand .logo-light { display: none; }
    :root:not([data-theme="light"]) .brand .logo-dark { display: block; }
  }
  .brand small { display: block; font-weight: 400; color: var(--muted); font-size: 12px; line-height: 1.2; }
  .brand span { line-height: 1.2; font-size: 15px; }
  nav.links { display: flex; gap: 22px; align-items: center; }
  nav.links a { color: var(--muted); font-size: 14px; font-weight: 500; }
  nav.links a:hover { color: var(--text); text-decoration: none; }
  .theme-btn {
    border: 1px solid var(--line); background: var(--surface); color: var(--text);
    width: 36px; height: 36px; border-radius: 8px; cursor: pointer; display: grid; place-items: center;
  }
  .menu-btn { display: none; }
  @media (max-width: 860px) {
    nav.links { display: none; position: absolute; top: 64px; left: 0; right: 0; flex-direction: column;
      background: var(--surface); border-bottom: 1px solid var(--line); padding: 12px 16px 18px; gap: 12px; align-items: flex-start; }
    nav.links.open { display: flex; }
    .menu-btn { display: grid; }
  }

  /* Hero */
  .hero {
    position: relative; overflow: hidden;
    background-image:
      linear-gradient(var(--grid) 1px, transparent 1px),
      linear-gradient(90deg, var(--grid) 1px, transparent 1px);
    background-size: 32px 32px;
    border-bottom: 1px solid var(--line);
  }
  .hero .wrap { display: grid; grid-template-columns: 1.15fr .85fr; gap: 40px; align-items: center; padding-top: 80px; padding-bottom: 80px; }
  .eyebrow { display: inline-flex; gap: 8px; align-items: center; font-size: 13px; color: var(--accent); background: var(--accent-soft);
    padding: 4px 10px; border-radius: 999px; font-weight: 500; }
  .eyebrow::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: var(--accent-2); }
  .hero h1 { font-size: clamp(36px, 5.4vw, 60px); margin: 18px 0 18px; letter-spacing: -.02em; }
  .hero h1 em { font-style: normal; color: var(--accent); }
  .hero p.lead { font-size: 18px; color: var(--muted); max-width: 560px; margin: 0 0 28px; }
  .cta { display: flex; gap: 12px; flex-wrap: wrap; }
  .btn { display: inline-flex; align-items: center; gap: 8px; padding: 11px 18px; border-radius: 10px; font-weight: 600; font-size: 15px; }
  .btn:hover { text-decoration: none; }
  .btn.primary { background: var(--accent); color: #fff; }
  :root[data-theme="dark"] .btn.primary { color: #0d1117; }
  @media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .btn.primary { color: #0d1117; } }
  .btn.ghost { border: 1px solid var(--line); color: var(--text); background: var(--surface); }
  .hero-art { display: flex; justify-content: center; }
  .hero-art svg { width: 100%; max-width: 400px; height: auto; }
  @media (max-width: 860px) {
    .hero .wrap { grid-template-columns: 1fr; padding-top: 48px; padding-bottom: 48px; }
    .hero-art { order: -1; }
    .hero-art svg { max-width: 260px; }
  }
  .arm-upper { transform-origin: 200px 300px; animation: swing 6s ease-in-out infinite; }
  .arm-lower { transform-origin: 200px 190px; animation: swing2 6s ease-in-out infinite; }
  .gripper { transform-origin: 290px 150px; animation: grip 6s ease-in-out infinite; }
  @keyframes swing { 0%,100% { transform: rotate(-8deg); } 50% { transform: rotate(10deg); } }
  @keyframes swing2 { 0%,100% { transform: rotate(10deg); } 50% { transform: rotate(-14deg); } }
  @keyframes grip { 0%,100% { transform: rotate(0); } 50% { transform: rotate(-20deg); } }
  @media (prefers-reduced-motion: reduce) { .arm-upper, .arm-lower, .gripper { animation: none; } }

  /* Stats */
  .stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; background: var(--line);
    border: 1px solid var(--line); border-radius: 14px; overflow: hidden; margin-top: -1px; }
  .stat { background: var(--surface); padding: 22px 20px; }
  .stat b { font-family: "Space Grotesk", sans-serif; font-size: 26px; display: block; }
  .stat span { color: var(--muted); font-size: 14px; }
  @media (max-width: 700px) { .stats { grid-template-columns: repeat(2, 1fr); } }

  /* Sections */
  section { padding: 84px 0; }
  section.alt { background: var(--surface); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
  .sec-head { max-width: 680px; margin-bottom: 40px; }
  .sec-head .kicker { font-size: 13px; color: var(--accent-2); font-weight: 500; }
  .sec-head h2 { font-size: clamp(28px, 3.6vw, 38px); margin: 8px 0 12px; letter-spacing: -.01em; }
  .sec-head p { color: var(--muted); margin: 0; font-size: 17px; }
  @media (max-width: 600px) { section { padding: 56px 0; } }

  .about-grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: 48px; align-items: start; }
  .about-grid p { margin: 0 0 16px; }
  .about-grid ul { margin: 0; padding: 0; list-style: none; display: grid; gap: 12px; }
  .about-grid li { display: flex; gap: 12px; padding: 14px 16px; background: var(--surface-2); border-radius: 10px; border: 1px solid var(--line); }
  .about-grid li b { display: block; }
  .about-grid li span { color: var(--muted); font-size: 14px; }
  .dot { flex: none; width: 10px; height: 10px; border-radius: 3px; background: var(--accent); margin-top: 7px; }
  @media (max-width: 860px) { .about-grid { grid-template-columns: 1fr; gap: 28px; } }

  .cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
  @media (max-width: 960px) { .cards { grid-template-columns: repeat(2, 1fr); } }
  @media (max-width: 600px) { .cards { grid-template-columns: 1fr; } }
  .card { background: var(--surface); border: 1px solid var(--line); border-radius: 14px; padding: 24px; box-shadow: var(--shadow); }
  section.alt .card { background: var(--bg); box-shadow: none; }
  .card .ico { width: 44px; height: 44px; border-radius: 10px; background: var(--accent-soft); color: var(--accent);
    display: grid; place-items: center; margin-bottom: 16px; }
  .card h3 { font-size: 19px; margin-bottom: 8px; }
  .card p { color: var(--muted); margin: 0; font-size: 15px; }
  .tags { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 14px; }
  .tag { font-size: 12px; padding: 3px 8px; border-radius: 6px; background: var(--surface-2); color: var(--muted); border: 1px solid var(--line); }

  .projects { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
  @media (max-width: 760px) { .projects { grid-template-columns: 1fr; } }
  .project { display: grid; grid-template-columns: 120px 1fr; background: var(--bg); border: 1px solid var(--line); border-radius: 14px; overflow: hidden; }
  .project .thumb { background: var(--accent-soft); display: grid; place-items: center; color: var(--accent); }
  .project .body { padding: 20px 22px; }
  .project .status { font-size: 12px; color: var(--accent-2); }
  .project h3 { font-size: 18px; margin: 4px 0 6px; }
  .project p { color: var(--muted); margin: 0; font-size: 15px; }
  @media (max-width: 460px) { .project { grid-template-columns: 1fr; } .project .thumb { height: 90px; } }

  .code {
    background: #0d1117; color: #c9d4e0; border-radius: 14px; padding: 22px 24px; font-size: 13.5px; line-height: 1.7;
    overflow-x: auto; border: 1px solid #2a3441; margin: 0;
  }
  .code .k { color: #ff8a52; } .code .s { color: #8fd18f; } .code .c { color: #6b7a8c; } .code .f { color: #5aa6f0; }

  .teach { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: center; }
  @media (max-width: 860px) { .teach { grid-template-columns: 1fr; } }
  .teach ol { margin: 0; padding: 0; list-style: none; counter-reset: s; display: grid; gap: 14px; }
  .teach li { counter-increment: s; display: grid; grid-template-columns: 36px 1fr; gap: 12px; }
  .teach li::before { content: counter(s, decimal-leading-zero); font-family: "JetBrains Mono", monospace; color: var(--accent); font-size: 14px; padding-top: 2px; }
  .teach li b { display: block; }
  .teach li span { color: var(--muted); font-size: 15px; }

  .team { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
  @media (max-width: 900px) { .team { grid-template-columns: repeat(2, 1fr); } }
  @media (max-width: 420px) { .team { grid-template-columns: 1fr; } }
  .member { text-align: center; padding: 24px 16px; background: var(--surface); border: 1px solid var(--line); border-radius: 14px; }
  .avatar { width: 72px; height: 72px; border-radius: 50%; margin: 0 auto 12px; display: grid; place-items: center;
    background: var(--accent-soft); color: var(--accent); font-family: "Space Grotesk", sans-serif; font-weight: 700; font-size: 22px; }
  .member b { display: block; }
  .member span { color: var(--muted); font-size: 14px; }

  .news { display: grid; gap: 0; border-top: 1px solid var(--line); }
  .news-item { display: grid; grid-template-columns: 140px 1fr; gap: 20px; padding: 18px 0; border-bottom: 1px solid var(--line); }
  .news-item time { color: var(--muted); font-size: 13px; padding-top: 2px; }
  .news-item b { display: block; }
  .news-item span { color: var(--muted); font-size: 15px; }
  @media (max-width: 600px) { .news-item { grid-template-columns: 1fr; gap: 4px; } }

  .contact { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
  @media (max-width: 760px) { .contact { grid-template-columns: 1fr; } }
  .contact .card p + p { margin-top: 10px; }
  .contact dl { margin: 0; display: grid; grid-template-columns: auto 1fr; gap: 10px 18px; font-size: 15px; }
  .contact dt { color: var(--muted); }
  .contact dd { margin: 0; }

  /* footer styles: see css/footer.css */