/* ---------- self-hosted fonts (SIL Open Font License) ---------- */
@font-face{font-family:"IBM Plex Sans";src:url("fonts/IBMPlexSans-Regular.woff2") format("woff2");font-weight:400;font-style:normal;font-display:swap}
@font-face{font-family:"IBM Plex Sans";src:url("fonts/IBMPlexSans-Medium.woff2") format("woff2");font-weight:500;font-style:normal;font-display:swap}
@font-face{font-family:"IBM Plex Sans";src:url("fonts/IBMPlexSans-SemiBold.woff2") format("woff2");font-weight:600;font-style:normal;font-display:swap}
@font-face{font-family:"IBM Plex Mono";src:url("fonts/IBMPlexMono-Regular.woff2") format("woff2");font-weight:400;font-style:normal;font-display:swap}
@font-face{font-family:"IBM Plex Mono";src:url("fonts/IBMPlexMono-Medium.woff2") format("woff2");font-weight:500;font-style:normal;font-display:swap}
@font-face{font-family:"Space Grotesk";src:url("fonts/SpaceGrotesk-Regular.woff2") format("woff2");font-weight:400;font-style:normal;font-display:swap}
@font-face{font-family:"Space Grotesk";src:url("fonts/SpaceGrotesk-Medium.woff2") format("woff2");font-weight:500;font-style:normal;font-display:swap}
@font-face{font-family:"Space Grotesk";src:url("fonts/SpaceGrotesk-SemiBold.woff2") format("woff2");font-weight:600;font-style:normal;font-display:swap}
@font-face{font-family:"Space Grotesk";src:url("fonts/SpaceGrotesk-Bold.woff2") format("woff2");font-weight:700;font-style:normal;font-display:swap}

:root{
    --bg:#FFFFFF;
    --bg-tint:#EDF2FB;
    --brand:#0756B1;        /* exact logo blue */
    --brand-dark:#073C7E;
    --ink:#0B2B55;          /* darkest body / headings */
    --text:#0B2B55;
    --muted:#345A8C;        /* secondary — blue, never gray (~7:1 on white) */
    --accent:#C2410C;       /* event marker graphic */
    --accent-text:#9A3412;  /* event marker label (~6:1 on white) */
    --white:#FFFFFF;
    --line:#CCDBF0;
    --line-strong:#A7C0E6;
    --max:1180px;
  }

  *{box-sizing:border-box}
  html{scroll-behavior:smooth}
  body{
    margin:0;background:var(--bg);color:var(--text);
    font-family:"IBM Plex Sans",system-ui,sans-serif;
    font-size:17px;line-height:1.66;-webkit-font-smoothing:antialiased;overflow-x:hidden;
  }
  a{color:inherit}
  .wrap{max-width:var(--max);margin:0 auto;padding:0 28px}

  body[data-lang="de"] .en{display:none}
  body[data-lang="en"] .de{display:none}

  .mono{font-family:"IBM Plex Mono",monospace}
  .eyebrow{font-family:"IBM Plex Mono",monospace;font-size:12px;letter-spacing:.22em;text-transform:uppercase;color:var(--brand)}

  /* ---------- header ---------- */
  header{position:sticky;top:0;z-index:60;background:rgba(255,255,255,.90);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
  .bar{display:flex;align-items:center;justify-content:space-between;height:74px;gap:18px}
  .brand{display:flex;align-items:center;text-decoration:none}
  .brand img{height:46px;width:auto;display:block}
  .bar-right{display:flex;align-items:center;gap:22px}
  nav{display:flex;gap:28px;align-items:center}
  nav a{text-decoration:none;font-size:14px;color:var(--ink);font-family:"IBM Plex Mono",monospace;letter-spacing:.04em;opacity:.82;transition:opacity .2s,color .2s}
  nav a:hover{opacity:1;color:var(--brand)}
  .nav-toggle{display:none}

  .lang{display:flex;border:1px solid var(--line-strong);border-radius:3px;overflow:hidden}
  .lang button{background:none;border:none;cursor:pointer;color:var(--muted);font-family:"IBM Plex Mono",monospace;font-size:12px;letter-spacing:.1em;padding:7px 11px;transition:.18s}
  .lang button + button{border-left:1px solid var(--line-strong)}
  .lang button[aria-pressed="true"]{background:var(--brand);color:#fff;font-weight:600}
  .lang button:hover[aria-pressed="false"]{color:var(--ink)}

  /* ---------- hero ---------- */
  .hero{padding:74px 0 40px;position:relative}
  .hero-grid{display:grid;grid-template-columns:1fr 1.05fr;gap:54px;align-items:center}
  h1{font-family:"Space Grotesk",sans-serif;font-weight:600;font-size:clamp(38px,5vw,62px);line-height:1.02;letter-spacing:-.02em;margin:18px 0 0;color:var(--ink)}
  h1 .em{color:var(--brand)}
  .lede{font-size:18.5px;color:var(--muted);max-width:38ch;margin:22px 0 0}
  .cta-row{display:flex;gap:14px;flex-wrap:wrap;margin-top:34px}
  .btn{text-decoration:none;font-family:"IBM Plex Mono",monospace;font-size:14px;padding:13px 22px;border-radius:3px;letter-spacing:.03em;display:inline-flex;align-items:center;transition:.2s}
  .btn-pri{background:var(--brand);color:#fff;font-weight:600}
  .btn-pri:hover{background:var(--brand-dark);transform:translateY(-1px)}
  .btn-sec{border:1px solid var(--line-strong);color:var(--brand)}
  .btn-sec:hover{border-color:var(--brand);background:var(--bg-tint)}

  /* ---------- instrument / OTDR ---------- */
  .scope{border:1px solid var(--line-strong);background:var(--bg-tint);border-radius:6px;padding:14px;position:relative;box-shadow:0 24px 50px -34px rgba(11,43,85,.45)}
  .scope-head{display:flex;justify-content:space-between;align-items:center;font-family:"IBM Plex Mono",monospace;font-size:11px;letter-spacing:.14em;color:var(--muted);text-transform:uppercase;padding:2px 4px 12px}
  .scope-head .live{display:flex;align-items:center;gap:7px;color:var(--brand)}
  .scope-head .dot{width:7px;height:7px;border-radius:50%;background:var(--brand);box-shadow:0 0 9px var(--brand);animation:pulse 1.8s infinite}
  @keyframes pulse{0%,100%{opacity:1}50%{opacity:.25}}
  .scope svg{display:block;width:100%;height:auto}
  .scope-foot{display:flex;gap:22px;flex-wrap:wrap;padding:12px 4px 2px;font-family:"IBM Plex Mono",monospace;font-size:11.5px;color:var(--muted)}
  .scope-foot b{color:var(--ink);font-weight:600}

  .trace{fill:none;stroke:var(--brand);stroke-width:2.2;stroke-linejoin:round;stroke-linecap:round;stroke-dasharray:2600;animation:draw 2.4s cubic-bezier(.5,0,.1,1) .2s both}
  @keyframes draw{from{stroke-dashoffset:2600}to{stroke-dashoffset:0}}
  .evt{animation:evtIn .5s ease both}
  .evt text{font-family:"IBM Plex Mono",monospace;font-size:13px;fill:var(--accent-text);font-weight:500}
  .evt line{stroke:var(--accent);stroke-width:1.2;stroke-dasharray:3 3}
  .evt circle{fill:var(--accent)}
  @keyframes evtIn{from{opacity:0}to{opacity:1}}
  .e1{animation-delay:1.2s}.e2{animation-delay:1.7s}.e3{animation-delay:2.2s}.e4{animation-delay:2.7s}
  .grid line{stroke:var(--line);stroke-width:1}
  .axis text{font-family:"IBM Plex Mono",monospace;font-size:12px;fill:var(--muted)}

  /* ---------- sections ---------- */
  section{padding:84px 0}
  .sec-head{display:flex;align-items:baseline;gap:18px;border-bottom:1px solid var(--line);padding-bottom:20px;margin-bottom:48px}
  .sec-head h2{font-family:"Space Grotesk",sans-serif;font-weight:600;font-size:clamp(26px,3.2vw,38px);margin:6px 0 0;color:var(--ink);letter-spacing:-.01em}
  .sec-head .idx{font-family:"IBM Plex Mono",monospace;color:var(--brand);font-size:13px;letter-spacing:.1em}

  /* ---------- services ---------- */
  .svc{display:grid;grid-template-columns:repeat(2,1fr);gap:1px;background:var(--line);border:1px solid var(--line)}
  .card{background:var(--bg);padding:34px 32px;transition:background .25s}
  .card:hover{background:var(--bg-tint)}
  .card .tag{font-family:"IBM Plex Mono",monospace;font-size:11px;letter-spacing:.16em;color:var(--accent-text);text-transform:uppercase}
  .card h3{font-family:"Space Grotesk",sans-serif;font-weight:500;font-size:22px;margin:14px 0 10px;color:var(--ink)}
  .card p{margin:0;color:var(--muted);font-size:16px}
  .card.span2{grid-column:1 / -1}
  .layers{display:flex;gap:10px;flex-wrap:wrap;margin-top:18px}
  .layer{font-family:"IBM Plex Mono",monospace;font-size:12px;color:var(--ink);border:1px solid var(--line-strong);border-radius:3px;padding:7px 12px;display:flex;gap:9px;align-items:center}
  .layer i{color:var(--brand);font-style:normal;font-weight:600}

  /* ---------- profile ---------- */
  .profile{display:grid;grid-template-columns:1fr 1fr;gap:50px;align-items:start}
  .profile p{font-size:18px;color:var(--ink);margin:0 0 18px}
  .profile .muted{color:var(--muted);font-size:16.5px}
  .specs{border-top:1px solid var(--line)}
  .spec{display:flex;justify-content:space-between;gap:20px;padding:15px 0;border-bottom:1px solid var(--line);font-family:"IBM Plex Mono",monospace;font-size:14px}
  .spec .k{color:var(--muted)}
  .spec .v{color:var(--ink);text-align:right}

  /* ---------- contact ---------- */
  #kontakt{background:var(--bg-tint);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
  .contact{display:grid;grid-template-columns:1.1fr 1fr;gap:50px;align-items:start}
  .ccard{background:var(--bg);border:1px solid var(--line-strong);border-radius:6px;padding:34px}
  .ccard .name{font-family:"Space Grotesk",sans-serif;font-size:21px;color:var(--ink);margin-bottom:18px}
  .crow{display:flex;gap:14px;padding:13px 0;border-top:1px solid var(--line);align-items:baseline}
  .crow:first-of-type{border-top:none}
  .crow .lbl{font-family:"IBM Plex Mono",monospace;font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);min-width:104px}
  .crow .val{font-size:16px;color:var(--ink)}
  .crow a.val{color:var(--brand);text-decoration:none;font-weight:500}
  .crow a.val:hover{text-decoration:underline}
  .contact .intro h2{font-family:"Space Grotesk",sans-serif;font-weight:600;font-size:30px;color:var(--ink);margin:14px 0 16px;letter-spacing:-.01em}
  .contact .intro p{color:var(--muted);margin:0 0 26px}

  /* ---------- legal ---------- */
  .legal-link{display:flex;justify-content:space-between;align-items:center;gap:16px;border:1px solid var(--line-strong);border-radius:4px;margin-bottom:14px;background:var(--bg);padding:20px 24px;text-decoration:none;font-family:"Space Grotesk",sans-serif;font-size:18px;color:var(--ink);transition:background .25s}
  .legal-link:hover{background:var(--bg-tint)}
  .legal-link .arrow{font-family:"IBM Plex Mono",monospace;color:var(--brand);font-size:20px;transition:transform .2s}
  .legal-link:hover .arrow{transform:translateX(3px)}
  details{border:1px solid var(--line-strong);border-radius:4px;margin-bottom:14px;background:var(--bg);overflow:hidden}
  summary{cursor:pointer;list-style:none;padding:20px 24px;display:flex;justify-content:space-between;align-items:center;gap:16px;font-family:"Space Grotesk",sans-serif;font-size:18px;color:var(--ink)}
  summary::-webkit-details-marker{display:none}
  summary .plus{font-family:"IBM Plex Mono",monospace;color:var(--brand);font-size:22px;transition:transform .25s}
  details[open] summary .plus{transform:rotate(45deg)}
  .legal-body{padding:4px 24px 26px;color:var(--text);font-size:15.5px;line-height:1.72}
  .legal-body h4{color:var(--ink);font-family:"IBM Plex Sans";font-weight:600;font-size:15.5px;margin:22px 0 6px}
  .legal-body p{margin:0 0 12px}
  .legal-body .caps{font-size:13.5px;letter-spacing:.02em;color:var(--ink);font-weight:500}
  .legal-body a{color:var(--brand)}
  .legal-body ol{padding-left:20px;margin:0 0 12px}

  /* ---------- footer ---------- */
  footer{padding:46px 0 60px;border-top:1px solid var(--line)}
  .foot{display:flex;justify-content:space-between;align-items:center;gap:24px;flex-wrap:wrap}
  .foot nav a{font-family:"IBM Plex Mono",monospace;font-size:13px;opacity:.85}
  .foot .copy{font-family:"IBM Plex Mono",monospace;font-size:12.5px;color:var(--muted)}

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

  /* ---------- responsive ---------- */
  @media(max-width:880px){
    .hero-grid,.profile,.contact{grid-template-columns:1fr;gap:38px}
    .svc{grid-template-columns:1fr}
    nav{display:none;position:absolute;top:74px;left:0;right:0;flex-direction:column;gap:0;background:var(--bg);border-bottom:1px solid var(--line)}
    nav.open{display:flex}
    nav a{padding:16px 28px;border-top:1px solid var(--line);width:100%;opacity:1}
    .nav-toggle{display:inline-block;background:none;border:1px solid var(--line-strong);color:var(--ink);border-radius:3px;padding:8px 12px;font-family:"IBM Plex Mono",monospace;font-size:13px;cursor:pointer}
    .hero{padding:48px 0 20px}
    .bar-right{gap:12px}
    .brand img{height:40px}
  }
  @media(prefers-reduced-motion:reduce){
    .trace{animation:none}
    .evt{animation:none}
    .dot{animation:none}
    html{scroll-behavior:auto}
  }