:root{
    --navy:#0B2140; --navy-deep:#06182F; --panel:#102541; --panel-2:#16314F;
    --sky:#87C7F2; --sky-soft:#BBDDF7; --sky-deep:#2C6FA6;
    --amber:#F2A33C; --amber-ink:#C9772B;
    --ink:#15243A; --muted:#566879; --faint:#8595A6;
    --paper:#FFFFFF; --paper-2:#F4F8FB; --hair:#E3EAF1;
    --text-d:#E9F2FB; --text-dim:#A9C0D6;
    /* syntax */
    --kw:#74AEEA; --fn:#87C7F2; --ty:#57B8AE; --num:#F2A33C; --cm:#8299B4; --str:#7FC78C; --at:#B6A0E2;
    --maxw:1200px;
  }
  *{box-sizing:border-box;margin:0;padding:0}
  html{scroll-behavior:smooth}
  body{font-family:'IBM Plex Sans',system-ui,sans-serif;color:var(--ink);background:var(--paper);line-height:1.6;-webkit-font-smoothing:antialiased}
  .mono{font-family:'JetBrains Mono',monospace}
  a{color:inherit;text-decoration:none}
  .wrap{max-width:var(--maxw);margin:0 auto;padding:0 40px}
  h1,h2,h3{font-family:'Space Grotesk',sans-serif;font-weight:600;letter-spacing:-0.02em;line-height:1.08}

  /* ===== hero (full-viewport, centered) ===== */
  /* ===== sticky nav ===== */
  .nav{position:fixed;top:0;left:0;right:0;z-index:60;height:64px;display:flex;align-items:center;gap:14px;padding:0 48px;background:transparent;border-bottom:1px solid transparent;transition:background .2s, border-color .2s}
  .nav.scrolled{background:rgba(8,24,47,.82);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom-color:rgba(135,199,242,.12)}
  section[id]{scroll-margin-top:72px}
  .nav .brand{display:flex;align-items:center;gap:12px}
  .nav .brand img{height:26px}
  .nav .wm{font-family:'JetBrains Mono';font-weight:500;font-size:18px;color:#fff}
  .nav .wm b{color:var(--sky);font-weight:500}
  .nav .lk{margin-left:30px;display:flex;gap:24px;font-size:13px;color:#BBD2E8}
  .nav .lk a:hover{color:#fff}
  .nav .rt{margin-left:auto;display:flex;gap:14px;align-items:center}
  .nav .ver{font-family:'JetBrains Mono';font-size:11px;color:var(--sky);border:1px solid rgba(135,199,242,.3);border-radius:5px;padding:3px 8px}
  .nav .gh{display:inline-flex;align-items:center;gap:7px;font-size:13px;font-weight:600;color:#fff;background:rgba(135,199,242,.12);border:1px solid rgba(135,199,242,.25);border-radius:8px;padding:6px 13px}
  .nav .gh:hover{background:rgba(135,199,242,.2)}

  /* ===== hero (centered) ===== */
  .hero{position:relative;width:100%;min-height:100vh;overflow:hidden;color:var(--text-d);background:radial-gradient(900px 500px at 50% 40%, #143257 0%, #081B33 60%, #06182F 100%)}
  .hero .wmk{position:absolute;left:50%;top:54%;transform:translate(-50%,-50%);height:min(46vw,420px);opacity:.07;filter:grayscale(.2);pointer-events:none}
  .hero .stars{position:absolute;inset:0;pointer-events:none}
  .hero .center{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:40px}
  .hero .lock{display:flex;align-items:center;gap:20px;margin-bottom:30px}
  .hero .lock img{height:92px}
  .hero .lock .wm{font-family:'JetBrains Mono';font-size:clamp(40px,7.4vw,66px);color:#fff;letter-spacing:.02em}
  .hero .lock .wm b{color:var(--sky);font-weight:500}
  .hero h1{font-family:'Space Grotesk',sans-serif;font-weight:600;letter-spacing:-.02em;line-height:1.1;color:#fff;font-size:clamp(24px,4.2vw,40px);max-width:22ch}
  .hero .sub{margin-top:18px;color:var(--text-dim);font-size:clamp(14px,2vw,17px);line-height:1.55;max-width:50ch}
  .hero .cta{margin-top:34px;display:flex;gap:14px;flex-wrap:wrap;justify-content:center}
  .hero .install{margin-top:28px;display:inline-flex;align-items:center;gap:14px;font-family:'JetBrains Mono';font-size:14.5px;color:var(--text-dim);background:rgba(8,24,47,.5);border:1px solid rgba(135,199,242,.18);border-radius:10px;padding:11px 16px}
  .hero .install .pr{color:var(--sky)}
  .hero .install .cp{margin-left:4px;color:var(--faint);cursor:pointer;border-left:1px solid rgba(135,199,242,.18);padding-left:12px}
  .hero .install .cp:hover{color:var(--sky)}
  @media(max-width:760px){ .nav .lk{display:none} }

  /* ===== buttons (shared: hero + closing CTA band) ===== */
  .btn{font-family:'IBM Plex Sans';font-weight:600;font-size:15px;padding:13px 24px;border-radius:11px;border:1px solid transparent;cursor:pointer;transition:transform .12s, background .15s;display:inline-flex;align-items:center;gap:9px}
  .btn:hover{transform:translateY(-1px)}
  .btn.primary{background:var(--sky);color:#08243f}
  .btn.primary:hover{background:var(--sky-soft)}
  .btn.ghost{background:transparent;border-color:rgba(135,199,242,.32);color:#fff}
  .btn svg,.nav .gh svg{width:16px;height:16px;flex:none}
  .pcard h3 a{display:inline-flex;align-items:center;gap:9px}
  .pcard h3 a svg{width:18px;height:18px;flex:none;color:var(--sky-deep)}
  .btn.ghost:hover{background:rgba(135,199,242,.1)}

  /* trust strip */
  .trust{background:var(--navy-deep);border-top:1px solid rgba(135,199,242,.1);border-bottom:1px solid rgba(135,199,242,.1)}
  .trust .wrap{display:flex;align-items:center;gap:38px;padding:22px 40px;flex-wrap:wrap}
  .trust .lab{font-family:'JetBrains Mono';font-size:11.5px;letter-spacing:.16em;text-transform:uppercase;color:var(--faint)}
  .trust .logos{display:flex;align-items:center;gap:34px;margin-left:auto;flex-wrap:wrap}
  .trust .logos img{height:30px;width:auto;object-fit:contain;opacity:.92}
  .trust .logos img.esa{height:40px}

  /* ===== section scaffold ===== */
  section.block{padding:96px 0}
  .eyebrow{font-family:'JetBrains Mono';font-size:12.5px;font-weight:600;letter-spacing:.18em;text-transform:uppercase;color:var(--sky-deep);display:flex;align-items:center;gap:11px;margin-bottom:18px}
  .eyebrow::before{content:"";width:26px;height:2px;background:var(--sky-deep);opacity:.55}
  .block h2{font-size:40px;max-width:20ch}
  .block .lede{font-size:19px;color:var(--muted);max-width:62ch;margin-top:14px}

  /* principles grid */
  .principles{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;margin-top:54px}
  .pcard{border:1px solid var(--hair);border-radius:16px;padding:28px 26px;background:var(--paper);transition:border-color .15s, box-shadow .15s, transform .15s}
  .pcard:hover{border-color:var(--sky-deep);box-shadow:0 18px 44px rgba(15,40,75,.08);transform:translateY(-2px)}
  .pcard .ic{width:46px;height:46px;border-radius:11px;background:var(--paper-2);border:1px solid var(--hair);display:flex;align-items:center;justify-content:center;color:var(--sky-deep);margin-bottom:18px}
  .pcard h3{font-size:20px;margin-bottom:8px}
  .pcard p{font-size:15px;color:var(--muted);line-height:1.55}
  @media(max-width:860px){ .principles{grid-template-columns:1fr} .hero .wrap{padding:64px 40px} }

  /* ===== code showcase (dark) ===== */
  .showcase{background:linear-gradient(178deg,#0C2143,#06182F);color:var(--text-d)}
  .showcase .wrap{display:grid;grid-template-columns:.92fr 1.08fr;gap:64px;align-items:center;padding:96px 40px}
  .showcase .eyebrow{color:var(--sky)}
  .showcase .eyebrow::before{background:var(--sky)}
  .showcase h2{color:#fff;font-size:38px}
  .showcase .lede{color:var(--text-dim);margin-top:14px}
  .showcase ul.feat{list-style:none;margin-top:26px;display:flex;flex-direction:column;gap:16px}
  .showcase ul.feat li{position:relative;padding-left:30px;font-size:16px;color:var(--text-dim)}
  .showcase ul.feat li::before{content:"";position:absolute;left:0;top:9px;width:13px;height:13px;border-radius:4px;background:var(--sky)}
  .showcase ul.feat li b{color:#fff;font-weight:600}
  .code{background:var(--panel);border-radius:15px;overflow:hidden;box-shadow:0 30px 70px rgba(0,0,0,.4);border:1px solid rgba(135,199,242,.1)}
  .code .head{display:flex;align-items:center;gap:8px;padding:14px 17px;border-bottom:1px solid rgba(255,255,255,.07)}
  .code .head .d{width:11px;height:11px;border-radius:50%}
  .code .head .fname{margin-left:9px;font-family:'JetBrains Mono';font-size:13px;color:#9FB6CE}
  .code .head .ext{margin-left:auto;font-family:'JetBrains Mono';font-size:11px;color:var(--sky);border:1px solid rgba(135,199,242,.3);border-radius:6px;padding:3px 9px}
  pre{margin:0;padding:18px 20px;overflow-x:auto;font-family:'JetBrains Mono';font-size:13px;line-height:1.7;color:#D7E4F1}
  pre .ln{color:#7C97B5;user-select:none;display:inline-block;width:2ch;text-align:right;margin-right:12px}
  .kw{color:var(--kw)}.fn{color:var(--fn)}.ty{color:var(--ty)}.num{color:var(--num)}.cm{color:var(--cm)}.str{color:var(--str)}.at{color:var(--at)}
  @media(max-width:860px){ .showcase .wrap{grid-template-columns:1fr;gap:40px} }
  .diagram-grid{border-radius:15px;border:1px solid rgba(135,199,242,.16);box-shadow:0 30px 70px rgba(0,0,0,.4);background-color:#F6F8FB;background-image:linear-gradient(rgba(86,104,121,.13) 1px,transparent 1px),linear-gradient(90deg,rgba(86,104,121,.13) 1px,transparent 1px);background-size:26px 26px;padding:40px 34px}
  .diagram-grid svg{width:100%;height:auto;display:block}

  /* ===== entities ===== */
  .entities .grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:50px}
  .ecard{border:1px solid var(--hair);border-radius:14px;padding:24px;display:flex;flex-direction:column;gap:10px;transition:border-color .15s, transform .15s}
  .ecard:hover{border-color:var(--sky-deep);transform:translateY(-2px)}
  .ecard .kw-name{font-family:'JetBrains Mono';font-size:15px;font-weight:700;color:var(--sky-deep)}
  .ecard h3{font-size:18px}
  .ecard p{font-size:14.5px;color:var(--muted);line-height:1.5}
  @media(max-width:860px){ .entities .grid{grid-template-columns:1fr} }

  /* ===== CTA band ===== */
  .ctaband{background:var(--paper-2)}
  .ctaband .inner{max-width:var(--maxw);margin:0 auto;padding:72px 40px;display:flex;align-items:center;gap:40px;flex-wrap:wrap}
  .ctaband .shield{width:96px;flex-shrink:0}
  .ctaband h2{font-size:34px}
  .ctaband p{color:var(--muted);font-size:17px;margin-top:8px;max-width:52ch}
  .ctaband .acts{margin-left:auto;display:flex;gap:14px;flex-wrap:wrap}
  .btn.dark{background:var(--navy);color:#fff}
  .btn.dark:hover{background:var(--panel-2)}
  .btn.outline{background:transparent;border-color:var(--hair);color:var(--ink)}
  .btn.outline:hover{border-color:var(--sky-deep);background:#fff}

  /* ===== footer ===== */
  footer{background:var(--navy-deep);color:var(--text-dim);padding:56px 0 40px}
  footer .wrap{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:40px}
  footer .brand{display:flex;align-items:center;gap:12px;margin-bottom:16px}
  footer .brand img{height:28px}
  footer .brand .wm{font-family:'JetBrains Mono';font-weight:500;font-size:18px;color:#fff}
  footer .brand .wm b{color:var(--sky);font-weight:500}
  footer p.blurb{font-size:14px;color:var(--faint);max-width:34ch;line-height:1.6}
  footer .col h4{font-family:'JetBrains Mono';font-size:11.5px;letter-spacing:.14em;text-transform:uppercase;color:var(--faint);margin-bottom:14px;font-weight:600}
  footer .col a{display:block;font-size:14.5px;color:var(--text-dim);padding:5px 0}
  footer .col a:hover{color:var(--sky)}
  footer .base{max-width:var(--maxw);margin:40px auto 0;padding:22px 40px 0;border-top:1px solid rgba(135,199,242,.12);display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;font-size:13px;color:var(--faint)}
  @media(max-width:860px){ footer .wrap{grid-template-columns:1fr 1fr} }