:root{
    --ink:#141a1f;
    --blueprint:#0e3a5c;
    --blueprint-2:#154a73;
    --diazo:#a9cadf;
    --diazo-dim:#6f93aa;
    --paper:#e6e8de;
    --paper-line:#b7c1ad;
    --paper-ink:#182018;
    --safety:#e2540c;
    --safety-dim:#b8430a;
    --white:#f6f5f0;
    --radius:2px;
    --sheet-w:210px;
  }

  *,*::before,*::after{box-sizing:border-box;}
  html{scroll-behavior:smooth;}
  @media (prefers-reduced-motion: reduce){
    html{scroll-behavior:auto;}
    *,*::before,*::after{animation-duration:0.001ms !important; transition-duration:0.001ms !important;}
  }

  body{
    margin:0;
    font-family:'IBM Plex Sans', sans-serif;
    color:var(--paper-ink);
    background:var(--paper);
    font-size:16px;
    line-height:1.55;
  }

  h1,h2,h3{
    font-family:'Space Grotesk', sans-serif;
    margin:0;
    line-height:1.1;
  }

  .mono{font-family:'IBM Plex Mono', monospace;}

  a{color:inherit;}
  button{font-family:inherit; cursor:pointer;}

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

  /* ---------- Sheet index rail ---------- */
  .rail{
    position:fixed;
    top:0; left:0; bottom:0;
    width:var(--sheet-w);
    background:var(--ink);
    border-right:1px solid #000;
    z-index:50;
    display:flex;
    flex-direction:column;
    padding:22px 0;
  }
  .rail__brand{
    padding:0 20px 18px;
    border-bottom:1px solid #2a333c;
    margin-bottom:8px;
  }
  .rail__brand .mono{
    color:var(--diazo-dim);
    font-size:11px;
    letter-spacing:0.06em;
    display:block;
  }
  .rail__brand strong{
    display:block;
    color:var(--white);
    font-family:'Space Grotesk', sans-serif;
    font-size:15px;
    margin-top:6px;
  }
  .rail__list{
    list-style:none;
    margin:0; padding:0;
    flex:1;
    overflow-y:auto;
  }
  .rail__link{
    display:flex;
    flex-direction:column;
    gap:2px;
    padding:10px 20px;
    text-decoration:none;
    border-left:3px solid transparent;
    color:#8b97a1;
    transition:border-color .15s ease, color .15s ease, background .15s ease;
  }
  .rail__link:hover{ color:var(--diazo); background:#182530; }
  .rail__link .mono{ font-size:11px; letter-spacing:0.05em; }
  .rail__link .rail__title{ font-size:12.5px; font-weight:500; }
  .rail__link.is-active{
    border-left-color:var(--safety);
    color:var(--white);
    background:#182530;
  }
  .rail__link.is-active .mono{ color:var(--safety); }

  .rail__toggle{ display:none; }

  /* ---------- Layout shell ---------- */
  main{ margin-left:var(--sheet-w); }
  .sheet{
    position:relative;
    padding:88px 64px;
    border-bottom:1px solid var(--paper-line);
  }
  .sheet__head{
    display:flex;
    align-items:baseline;
    gap:14px;
    margin-bottom:34px;
    flex-wrap:wrap;
  }
  .sheet__num{
    font-size:13px;
    color:var(--blueprint);
    background:#d6dbc9;
    border:1px solid var(--paper-line);
    padding:3px 8px;
    letter-spacing:0.05em;
  }
  .sheet__head h2{
    font-size:clamp(22px,2.4vw,30px);
    letter-spacing:0.01em;
  }
  .sheet--dark{
    background:var(--blueprint);
    color:var(--white);
    border-bottom:1px solid #06263f;
  }
  .sheet--dark .sheet__num{
    color:var(--white);
    background:transparent;
    border-color:var(--diazo-dim);
  }

  /* ---------- Hero ---------- */
  .hero{
    min-height:100vh;
    display:flex;
    flex-direction:column;
    justify-content:center;
    padding:64px;
    background:
      linear-gradient(180deg, rgba(255,255,255,0.02), rgba(255,255,255,0) 30%),
      repeating-linear-gradient(0deg, rgba(169,202,223,0.05) 0 1px, transparent 1px 48px),
      repeating-linear-gradient(90deg, rgba(169,202,223,0.05) 0 1px, transparent 1px 48px),
      var(--blueprint);
    color:var(--white);
  }
  .hero__eyebrow{
    color:var(--diazo);
    font-size:12.5px;
    letter-spacing:0.08em;
    margin-bottom:22px;
    display:block;
  }
  .hero__grid{
    display:grid;
    grid-template-columns:1.3fr 0.7fr;
    gap:48px;
    align-items:center;
    max-width:1180px;
  }
  h1.hero__eyebrow{
    font-family:'IBM Plex Mono', monospace;
    font-weight:400;
    line-height:1.55;
  }
  .hero__tagline{
    font-family:'Space Grotesk', sans-serif;
    line-height:1.1;
    margin:0;
    font-size:clamp(34px,4.6vw,58px);
    font-weight:600;
    max-width:18ch;
    opacity:0;
    transform:translateY(14px);
    animation:rise .7s ease forwards .05s;
  }
  .contact-info dd a{ text-decoration:none; border-bottom:1px solid var(--diazo-dim); }
  .contact-info dd a:hover{ border-bottom-color:var(--white); }
  .form-note{ margin-top:12px; font-size:12.5px; color:var(--diazo); }
  .sectors{ display:flex; flex-wrap:wrap; gap:8px; margin:0 0 32px; padding:0; list-style:none; }
  .sectors li{ font-family:'IBM Plex Mono', monospace; font-size:11.5px; letter-spacing:0.04em; color:var(--blueprint); background:#d6dbc9; border:1px solid var(--paper-line); padding:4px 9px; }
  .hero__sub{
    margin-top:22px;
    font-size:17px;
    color:#d7e2ea;
    max-width:52ch;
    opacity:0;
    transform:translateY(14px);
    animation:rise .7s ease forwards .18s;
  }
  @keyframes rise{ to{ opacity:1; transform:translateY(0); } }

  .hero__cta{
    margin-top:36px;
    display:flex;
    gap:16px;
    flex-wrap:wrap;
  }
  .btn{
    display:inline-flex;
    align-items:center;
    gap:8px;
    padding:13px 22px;
    border-radius:var(--radius);
    text-decoration:none;
    font-weight:600;
    font-size:14.5px;
    letter-spacing:0.01em;
    border:1px solid transparent;
    transition:background .15s ease, color .15s ease, border-color .15s ease, transform .1s ease;
  }
  .btn:active{ transform:translateY(1px); }
  .btn--fill{ background:var(--safety); color:var(--white); }
  .btn--fill:hover{ background:var(--safety-dim); }
  .btn--ghost{ border-color:var(--diazo-dim); color:var(--white); }
  .btn--ghost:hover{ border-color:var(--white); background:rgba(255,255,255,0.06); }

  .titleblock{
    margin-top:56px;
    border-top:1px solid var(--diazo-dim);
    padding-top:20px;
    display:grid;
    grid-template-columns:repeat(4,1fr);
    gap:18px;
    max-width:1180px;
  }
  .titleblock div{ font-size:12.5px; }
  .titleblock .mono{ color:var(--diazo); display:block; margin-bottom:4px; font-size:10.5px; letter-spacing:0.06em; }
  .titleblock strong{ color:var(--white); font-weight:500; }

  .diagram{ width:100%; height:auto; opacity:0.9; }

  /* ---------- Services grid ---------- */
  .card-grid{
    display:grid;
    grid-template-columns:repeat(3,1fr);
    gap:1px;
    background:var(--paper-line);
    border:1px solid var(--paper-line);
  }
  .card{
    background:var(--paper);
    padding:26px 24px;
  }
  .card .mono{
    display:block;
    font-size:12px;
    color:var(--blueprint);
    letter-spacing:0.04em;
    margin-bottom:10px;
  }
  .card p{ margin:0; font-size:14.5px; color:#3a4238; }

  .lede{
    max-width:62ch;
    font-size:16.5px;
    color:#39412f;
    margin-bottom:36px;
  }

  /* ---------- Data center list ---------- */
  .dc-layout{
    display:grid;
    grid-template-columns:0.9fr 1.1fr;
    gap:56px;
    align-items:start;
  }
  .dc-layout p{ font-size:16.5px; color:#39412f; max-width:46ch; }
  .checklist{ list-style:none; margin:0; padding:0; }
  .checklist li{
    display:flex;
    gap:14px;
    padding:16px 0;
    border-top:1px solid var(--paper-line);
    font-size:15px;
  }
  .checklist li:first-child{ border-top:none; }
  .checklist .tag{
    flex:0 0 auto;
    font-size:11px;
    color:var(--blueprint);
    background:#d6dbc9;
    padding:3px 7px;
    height:fit-content;
    border:1px solid var(--paper-line);
  }

  /* ---------- Schedule table ---------- */
  .schedule-wrap{ overflow-x:auto; border:1px solid var(--paper-line); }
  table.schedule{
    width:100%;
    border-collapse:collapse;
    min-width:720px;
    background:var(--paper);
  }
  table.schedule th{
    text-align:left;
    font-family:'IBM Plex Mono', monospace;
    font-size:11.5px;
    letter-spacing:0.05em;
    color:var(--white);
    background:var(--blueprint);
    padding:12px 16px;
  }
  table.schedule td{
    padding:16px;
    border-top:1px solid var(--paper-line);
    font-size:14.5px;
    vertical-align:top;
  }
  table.schedule td.model{
    font-family:'IBM Plex Mono', monospace;
    font-weight:600;
    color:var(--blueprint);
    white-space:nowrap;
  }
  .schedule-note{
    margin-top:14px;
    font-size:13px;
    color:#5a6350;
    font-family:'IBM Plex Mono', monospace;
  }

  /* ---------- Tools ---------- */
  .tools-grid{
    display:grid;
    grid-template-columns:1fr 1fr;
    gap:48px;
  }
  .tools-grid h3{
    font-size:13px;
    font-family:'IBM Plex Mono', monospace;
    color:var(--blueprint);
    letter-spacing:0.05em;
    margin-bottom:14px;
  }
  .tools-grid ul{ margin:0; padding:0; list-style:none; }
  .tools-grid li{
    padding:11px 0;
    border-top:1px solid var(--paper-line);
    font-size:14.5px;
  }
  .tools-grid li:first-child{ border-top:none; }
  .tools-grid li strong{ display:block; font-size:14.5px; margin-bottom:2px; }
  .tools-grid li span{ color:#4b5340; font-size:13.5px; }

  /* ---------- Contact ---------- */
  .contact-grid{
    display:grid;
    grid-template-columns:1fr 1fr;
    gap:56px;
    align-items:start;
  }
  .field{ margin-bottom:18px; }
  .field-row{ display:grid; grid-template-columns:1fr 1fr; gap:0 16px; }
  .field select option{ color:#141a1f; }
  .btn:disabled{ opacity:.6; cursor:wait; }
  .field label{
    display:block;
    font-size:12px;
    font-family:'IBM Plex Mono', monospace;
    letter-spacing:0.04em;
    color:var(--diazo);
    margin-bottom:7px;
  }
  .field input, .field select, .field textarea{
    width:100%;
    background:rgba(255,255,255,0.04);
    border:1px solid var(--diazo-dim);
    color:var(--white);
    padding:11px 12px;
    font-size:14.5px;
    font-family:inherit;
    border-radius:var(--radius);
  }
  .field input::placeholder, .field textarea::placeholder{ color:#7f97a6; }
  .field textarea{ resize:vertical; min-height:110px; }

  .contact-info{ font-size:14.5px; }
  .contact-info .mono{ color:var(--diazo); font-size:11.5px; letter-spacing:0.05em; display:block; margin-bottom:6px; }
  .contact-info dl{ margin:0 0 28px; }
  .contact-info dt{ margin-top:18px; }
  .contact-info dd{ margin:0; color:var(--white); font-size:15.5px; }
  .contact-info dt:first-child{ margin-top:0; }

  footer{
    padding:26px 64px;
    background:#0a2338;
    color:#75899a;
    font-size:12px;
    display:flex;
    justify-content:space-between;
    flex-wrap:wrap;
    gap:8px;
  }

  /* ---------- Responsive ---------- */
  @media (max-width:1200px){ .card-grid{ grid-template-columns:repeat(2,1fr); } }
  @media (max-width:640px){ .card-grid{ grid-template-columns:1fr; } }
  @media (max-width:900px){
    .rail{
      position:sticky;
      top:0;
      width:100%;
      height:auto;
      flex-direction:row;
      align-items:center;
      padding:12px 14px;
      overflow-x:auto;
      z-index:100;
    }
    .rail__brand{
      border-bottom:none;
      border-right:1px solid #2a333c;
      padding:0 16px 0 0;
      margin:0 12px 0 0;
      flex:0 0 auto;
    }
    .rail__brand strong{ font-size:13px; margin-top:3px; }
    .rail__list{
      display:flex;
      flex:none;
      gap:2px;
    }
    .rail__link{
      flex:0 0 auto;
      border-left:none;
      border-bottom:3px solid transparent;
      padding:8px 12px;
      white-space:nowrap;
    }
    .rail__link.is-active{ border-left-color:transparent; border-bottom-color:var(--safety); }
    main{ margin-left:0; }
    .sheet, .hero{ padding:56px 22px; }
    .hero__grid, .dc-layout, .tools-grid, .contact-grid, .field-row{ grid-template-columns:1fr; }
    .hero__grid{ gap:36px; }
    .titleblock{ grid-template-columns:1fr 1fr; }
    footer{ padding:22px; flex-direction:column; }
  }

  /* ---------- Shared additions ---------- */
  .rail__link--page .mono{ color:#6f93aa; }
  footer a{ text-decoration:none; color:#9fb3c3; }
  footer a:hover{ color:var(--white); }
  .footer-nav{ display:flex; gap:18px; flex-wrap:wrap; }

  /* ---------- About page ---------- */
  .about-hero{
    padding:88px 64px 64px;
    background:
      repeating-linear-gradient(0deg, rgba(169,202,223,0.05) 0 1px, transparent 1px 48px),
      repeating-linear-gradient(90deg, rgba(169,202,223,0.05) 0 1px, transparent 1px 48px),
      var(--blueprint);
    color:var(--white);
  }
  .about-hero__grid{
    display:grid;
    grid-template-columns:1.25fr 0.75fr;
    gap:56px;
    align-items:center;
    max-width:1180px;
  }
  .about-hero h1{
    font-size:clamp(30px,3.8vw,48px);
    font-weight:600;
    max-width:20ch;
  }
  .about-hero__sub{ margin-top:18px; font-size:17px; color:#d7e2ea; max-width:52ch; }
  .portrait{ margin:0; border:1px solid var(--diazo-dim); background:#0a2338; max-width:340px; justify-self:end; width:100%; }
  .portrait img{ display:block; width:100%; height:auto; aspect-ratio:1/1; object-fit:cover; }
  .portrait figcaption{
    display:grid; grid-template-columns:1fr 1fr;
    border-top:1px solid var(--diazo-dim);
    font-family:'IBM Plex Mono', monospace; font-size:10.5px; letter-spacing:0.06em; color:var(--diazo);
  }
  .portrait figcaption span{ padding:9px 12px; }
  .portrait figcaption span + span{ border-left:1px solid var(--diazo-dim); color:var(--white); }
  .prose{ max-width:68ch; }
  .prose p{ font-size:16.5px; color:#2f372a; margin:0 0 18px; }
  .prose p:last-child{ margin-bottom:0; }
  .two-col{ display:grid; grid-template-columns:1fr 1fr; gap:1px; background:var(--paper-line); border:1px solid var(--paper-line); }
  .two-col > div{ background:var(--paper); padding:30px 28px; }
  .two-col h3{ font-size:19px; margin-bottom:12px; }
  .two-col p{ margin:0; font-size:15px; color:#3a4238; }
  .clients{ list-style:none; margin:0 0 26px; padding:0; display:grid; grid-template-columns:repeat(auto-fit,minmax(200px,1fr)); gap:1px; background:var(--paper-line); border:1px solid var(--paper-line); }
  .clients li{ background:var(--paper); padding:16px 18px; font-size:15px; font-weight:500; }
  .cta-band{ display:flex; justify-content:space-between; align-items:center; gap:28px; flex-wrap:wrap; }
  .cta-band p{ margin:8px 0 0; color:#d7e2ea; font-size:15.5px; }
  .cta-band a.plain{ color:var(--white); text-decoration:none; border-bottom:1px solid var(--diazo-dim); }
  @media (max-width:900px){
    .about-hero{ padding:48px 22px; }
    .about-hero__grid, .two-col{ grid-template-columns:1fr; }
    .portrait{ justify-self:start; max-width:300px; }
  }

  /* ---------- Home: About strip ---------- */
  .about-strip{ padding-top:64px; padding-bottom:64px; }
  .about-strip__grid{ display:grid; grid-template-columns:180px 1fr; gap:40px; align-items:center; max-width:980px; }
  .about-strip__photo{ display:block; border:1px solid var(--paper-line); background:var(--white); padding:6px; }
  .about-strip__photo img{ display:block; width:100%; height:auto; }
  .about-strip .sheet__head{ margin-bottom:16px; }
  .about-strip__text{ font-size:16.5px; color:#2f372a; max-width:60ch; margin:0 0 18px; }
  .about-strip__link{ font-size:12.5px; letter-spacing:0.06em; color:var(--blueprint); text-decoration:none; border-bottom:1px solid var(--blueprint); padding-bottom:2px; }
  .about-strip__link:hover{ color:var(--safety); border-bottom-color:var(--safety); }
  @media (max-width:900px){
    .about-strip__grid{ grid-template-columns:120px 1fr; gap:22px; align-items:start; }
  }