:root{
    --bg:#FFFFFF;
    --bg-soft:#F7F7F5;
    --ink:#17181A;
    --ink-soft:#6B6E72;
    --line:#E7E7E4;
    --accent:#B6541E;
    --accent-soft:#F4E9E2;
    --signal:#3E6B57;
    --card:#FFFFFF;
    --font-display:'Space Grotesk', sans-serif;
    --font-body:'IBM Plex Sans', sans-serif;
  }
  :root[data-theme="dark"]{
    --bg:#131415;
    --bg-soft:#1A1B1C;
    --ink:#EFEFEC;
    --ink-soft:#A3A6A9;
    --line:#2C2D2F;
    --accent:#E08249;
    --accent-soft:#2A1F1A;
    --signal:#7EA893;
    --card:#191A1B;
  }

  *{box-sizing:border-box;}
  html{scroll-behavior:smooth;}
  body{
    margin:0;
    background:var(--bg);
    color:var(--ink);
    font-family:var(--font-body);
    font-size:16px;
    line-height:1.6;
    -webkit-font-smoothing:antialiased;
  }
  img{max-width:100%;display:block;}
  a{color:inherit;}
  .wrap{max-width:1080px;margin:0 auto;padding:0 28px;}
  section{position:relative;}
  ::selection{background:var(--accent);color:#fff;}
  :focus-visible{outline:2px solid var(--accent);outline-offset:3px;}

  @media (prefers-reduced-motion: reduce){
    *{animation-duration:0.01ms !important; animation-iteration-count:1 !important; transition-duration:0.01ms !important; scroll-behavior:auto !important;}
  }

  /* ---------- language modal ---------- */
  .lang-modal{
    position:fixed;inset:0;z-index:100;
    display:none;align-items:center;justify-content:center;
    background:color-mix(in srgb, var(--ink) 55%, transparent);
    padding:20px;
  }
  .lang-modal.show{display:flex;}
  .lang-box{
    background:var(--card);border:1px solid var(--line);border-radius:10px;
    padding:36px 32px;max-width:380px;width:100%;text-align:center;
  }
  .lang-dot{width:11px;height:11px;border-radius:50%;background:var(--accent);margin:0 auto 18px;}
  .lang-box h2{
    font-family:var(--font-display);font-weight:600;font-size:1.1rem;
    margin:0 0 24px;line-height:1.4;letter-spacing:-0.01em;
  }
  .lang-choices{display:flex;gap:12px;flex-wrap:wrap;justify-content:center;}
  .lang-choice{
    flex:1;min-width:140px;font-family:var(--font-body);font-size:15px;font-weight:500;
    padding:13px 20px;border-radius:4px;border:1px solid var(--ink);
    background:var(--ink);color:var(--bg);cursor:pointer;transition:opacity .15s;
  }
  .lang-choice:hover{opacity:.85;}

  /* ---------- header ---------- */
  header{
    position:sticky;top:0;z-index:40;
    background:color-mix(in srgb, var(--bg) 92%, transparent);
    backdrop-filter:blur(6px);
    border-bottom:1px solid var(--line);
  }
  .nav{display:flex;align-items:center;justify-content:space-between;padding:18px 28px;max-width:1080px;margin:0 auto;}
  .brand{display:flex;align-items:center;gap:9px;font-family:var(--font-display);font-weight:600;font-size:17px;}
  .brand-dot{width:9px;height:9px;border-radius:50%;background:var(--accent);flex:none;}
  .navlinks{display:flex;align-items:center;gap:30px;font-size:15px;}
  .navlinks a{text-decoration:none;color:var(--ink-soft);transition:color .15s;}
  .navlinks a:hover{color:var(--ink);}
  .nav-cta{
    font-size:14.5px;font-weight:500;
    background:var(--ink);color:var(--bg);
    padding:10px 18px;text-decoration:none;border-radius:2px;
  }
  .nav-cta:hover{opacity:.85;}
  .lang-switch{
    font-family:var(--font-body);font-size:13px;font-weight:600;letter-spacing:.02em;
    background:none;border:1px solid var(--line);border-radius:20px;
    padding:6px 12px;color:var(--ink-soft);cursor:pointer;transition:color .15s, border-color .15s;
  }
  .lang-switch:hover{color:var(--ink);border-color:var(--ink);}
  .menu-btn{display:none;background:none;border:1px solid var(--line);border-radius:2px;padding:8px 11px;color:var(--ink);font-size:16px;}
  @media (max-width:760px){
    .navlinks{display:none;}
    .menu-btn{display:block;}
    .navlinks.open{
      display:flex;flex-direction:column;align-items:flex-start;gap:0;
      position:absolute;top:100%;left:0;right:0;
      background:var(--bg);border-bottom:1px solid var(--line);
      padding:6px 28px 18px;
    }
    .navlinks.open a{padding:12px 0;width:100%;border-bottom:1px solid var(--line);}
    .navlinks.open .nav-cta{margin-top:12px;}
    .navlinks.open .lang-switch{margin-top:12px;}
  }

  /* ---------- hero ---------- */
  .hero{padding:90px 0 84px;}
  .hero-inner{
    max-width:1080px;margin:0 auto;padding:0 28px;
    display:grid;grid-template-columns:1.1fr 0.9fr;gap:56px;align-items:center;
  }
  .eyebrow{
    font-size:14px;font-weight:500;color:var(--accent);
    margin-bottom:20px;
  }
  h1{
    font-family:var(--font-display);font-weight:600;
    font-size:clamp(2.2rem, 4.4vw, 3.2rem);
    line-height:1.12;letter-spacing:-0.01em;
    margin:0 0 22px;max-width:15ch;
  }
  .hero p.lede{font-size:18px;color:var(--ink-soft);max-width:44ch;margin:0 0 32px;}
  .hero-actions{display:flex;gap:14px;flex-wrap:wrap;}
  .btn{
    display:inline-block;font-size:15px;font-weight:500;
    padding:14px 24px;text-decoration:none;border-radius:2px;
    border:1px solid var(--ink);transition:background .15s, color .15s, opacity .15s;
  }
  .btn-primary{background:var(--ink);color:var(--bg);}
  .btn-primary:hover{opacity:.85;}
  .btn-ghost{background:transparent;color:var(--ink);border-color:var(--line);}
  .btn-ghost:hover{border-color:var(--ink);}
  button.btn{cursor:pointer;font-family:var(--font-body);}

  .hero-visual{
    aspect-ratio:1/1;background:var(--bg-soft);border-radius:8px;
    position:relative;overflow:hidden;display:flex;align-items:center;justify-content:center;
  }
  .hero-visual svg{width:78%;height:78%;}
  .ping{transform-origin:150px 150px;}
  .ping circle{animation:ping 2.6s ease-out infinite;}
  .ping circle:nth-child(2){animation-delay:.9s;}
  .ping circle:nth-child(3){animation-delay:1.8s;}
  @keyframes ping{
    0%{r:10;opacity:.55;}
    100%{r:120;opacity:0;}
  }

  /* what we do — clarity strip */
  .clarity{padding:0 0 70px;}
  .clarity-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--line);border:1px solid var(--line);border-radius:8px;overflow:hidden;}
  .clarity-item{background:var(--card);padding:26px 24px;}
  .clarity-item .k{font-size:13.5px;font-weight:500;color:var(--accent);margin-bottom:8px;}
  .clarity-item p{margin:0;color:var(--ink-soft);font-size:15px;}
  @media (max-width:700px){.clarity-grid{grid-template-columns:1fr;}}

  /* ---------- section headers ---------- */
  .section-head{margin-bottom:44px;max-width:56ch;}
  .kicker{font-size:14px;font-weight:500;color:var(--accent);margin-bottom:10px;}
  h2{font-family:var(--font-display);font-weight:600;font-size:clamp(1.55rem,2.4vw,2rem);margin:0 0 12px;letter-spacing:-0.01em;}
  .section-head p{color:var(--ink-soft);font-size:16px;margin:0;}
  section.pad{padding:78px 0;}
  section.pad.divider{border-top:1px solid var(--line);}

  /* ---------- engagement models ---------- */
  .models{display:grid;grid-template-columns:1fr 1fr;gap:20px;}
  .model{background:var(--bg-soft);border-radius:8px;padding:32px;}
  .model .num{font-size:13.5px;font-weight:500;color:var(--ink-soft);margin-bottom:16px;}
  .model h3{font-family:var(--font-display);font-size:1.3rem;font-weight:600;margin:0 0 12px;}
  .model p{color:var(--ink-soft);margin:0 0 18px;}
  .model ul{margin:0;padding:0;list-style:none;}
  .model li{font-size:14.5px;padding:9px 0;border-top:1px solid var(--line);display:flex;gap:10px;color:var(--ink);}
  .model li:first-child{border-top:none;}
  .model li::before{content:"–";color:var(--accent);flex:none;}
  @media (max-width:760px){.models{grid-template-columns:1fr;}}

  /* ---------- stack ---------- */
  .stack{display:grid;grid-template-columns:1fr 1fr;gap:20px;}
  .stack-col{background:var(--bg-soft);border-radius:8px;padding:32px;border-top:3px solid var(--line);}
  .stack-col.firmware{border-top-color:var(--signal);}
  .stack-col.ihm{border-top-color:var(--accent);}
  .stack-label{font-size:13px;font-weight:500;color:var(--ink-soft);margin-bottom:8px;}
  .stack-col h3{font-family:var(--font-display);font-size:1.25rem;font-weight:600;margin:0 0 14px;}
  .chips{display:flex;flex-wrap:wrap;gap:8px;margin:16px 0 18px;}
  .chip{font-size:13px;background:var(--bg);border:1px solid var(--line);border-radius:20px;padding:6px 12px;color:var(--ink-soft);}
  .stack-col p{color:var(--ink-soft);margin:0;font-size:15px;}
  .stack-col p.rule{color:var(--ink);font-weight:500;margin-top:14px;}
  @media (max-width:760px){.stack{grid-template-columns:1fr;}}

  /* ---------- project log ---------- */
  .log-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px;}
  @media (max-width:760px){.log-grid{grid-template-columns:1fr;}}
  .log-item{background:var(--bg-soft);border-radius:8px;padding:26px;}
  .log-item h3{font-family:var(--font-display);font-size:1.05rem;font-weight:600;margin:0 0 8px;}
  .log-item p{color:var(--ink-soft);margin:0 0 14px;font-size:14.5px;}
  .log-tags{display:flex;flex-wrap:wrap;gap:7px;}
  .tag{font-size:12px;color:var(--ink-soft);background:var(--bg);border:1px solid var(--line);border-radius:20px;padding:4px 10px;}

  /* ---------- contact ---------- */
  .contact-grid{display:grid;grid-template-columns:0.85fr 1.15fr;gap:56px;}
  @media (max-width:820px){.contact-grid{grid-template-columns:1fr;}}
  .contact-info h2{margin-bottom:16px;}
  .contact-info p{color:var(--ink-soft);margin:0 0 20px;max-width:40ch;}
  .contact-info .direct{font-size:15px;border-top:1px solid var(--line);padding-top:20px;margin-top:26px;}
  .contact-info .direct a{color:var(--ink);text-decoration:none;border-bottom:1px solid var(--accent);}

  form{background:var(--bg-soft);border-radius:8px;padding:32px;}
  .form-row{display:grid;grid-template-columns:1fr 1fr;gap:16px;}
  @media (max-width:520px){.form-row{grid-template-columns:1fr;}}
  .field{margin-bottom:18px;}
  .field label{display:block;font-size:13.5px;font-weight:500;color:var(--ink-soft);margin-bottom:7px;}
  .field input[type="text"],
  .field input[type="email"],
  .field input[type="number"],
  .field select,
  .field textarea{
    width:100%;background:var(--bg);border:1px solid var(--line);border-radius:4px;color:var(--ink);
    font-family:var(--font-body);font-size:15px;padding:11px 12px;
  }
  .field textarea{resize:vertical;min-height:96px;}
  fieldset{border:1px solid var(--line);border-radius:4px;padding:14px 14px 8px;margin:0 0 18px;}
  fieldset legend{font-size:13.5px;font-weight:500;color:var(--ink-soft);padding:0 6px;}
  .check-row{display:flex;flex-wrap:wrap;gap:16px;padding-bottom:8px;}
  .check-row label{display:flex;align-items:center;gap:8px;font-size:14.5px;color:var(--ink);}
  .check-row input{accent-color:var(--accent);}
  .submit-row{display:flex;align-items:center;gap:16px;margin-top:6px;flex-wrap:wrap;}
  button.btn{border:1px solid var(--ink);background:var(--ink);color:var(--bg);}
  button.btn:hover{opacity:.85;}
  .form-note{font-size:13.5px;color:var(--ink-soft);}
  .confirm{
    display:none;border:1px solid var(--signal);background:var(--accent-soft);
    border-radius:6px;padding:18px;font-size:14.5px;margin-top:16px;
  }
  .confirm.show{display:block;}
  .confirm .ref{color:var(--signal);font-weight:600;}
  .confirm.error{border-color:var(--accent);background:var(--accent-soft);color:var(--ink);}
  button.btn:disabled{opacity:.6;cursor:not-allowed;}

  footer{padding:40px 0;border-top:1px solid var(--line);}
  footer .wrap{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:12px;}
  footer p{font-size:13.5px;color:var(--ink-soft);margin:0;}