:root {
    --void:  #060B18;
    --navy:  #0B1326;
    --panel: #0F1A33;
    --line:  rgba(120, 170, 255, .13);
    --cyan:  #4FD8EB;
    --amber: #F5B342;
    --text:  #D9E3F5;
    --dim:   #7E8DAB;
    --mono:  'IBM Plex Mono', ui-monospace, monospace;
    --sans:  'Space Grotesk', system-ui, sans-serif;
  }

  * { margin: 0; padding: 0; box-sizing: border-box; }

  html { scroll-behavior: smooth; }

  body {
    background: var(--void);
    color: var(--text);
    font-family: var(--sans);
    font-size: 16px;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
  }

  ::selection { background: var(--cyan); color: var(--void); }

  a { color: var(--cyan); text-decoration: none; }
  a:focus-visible, button:focus-visible {
    outline: 2px solid var(--amber);
    outline-offset: 3px;
  }

  .wrap { max-width: 1120px; margin: 0 auto; padding: 0 24px; }

  /* ---------- top bar ---------- */
  header {
    position: sticky; top: 0; z-index: 20;
    background: rgba(6, 11, 24, .82);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--line);
  }
  .bar {
    display: flex; align-items: center; justify-content: space-between;
    height: 60px;
  }
  .mark {
    display: flex; align-items: center; gap: 10px;
    font-family: var(--mono); font-size: 13px; letter-spacing: .18em;
    color: var(--text);
  }
  .mark b { color: var(--cyan); font-weight: 600; }
  .mark-icon {
    position: relative; width: 20px; height: 20px; flex: none;
    border: 1.5px solid var(--cyan); border-radius: 50%;
  }
  .mark-core {
    position: absolute; top: 50%; left: 50%;
    width: 6px; height: 6px; border-radius: 50%;
    background: var(--amber); transform: translate(-50%, -50%);
  }
  .mark-sat {
    position: absolute; top: -2px; right: -3px;
    width: 4px; height: 4px; border-radius: 50%;
    background: var(--cyan);
  }
  nav { display: flex; gap: 28px; font-family: var(--mono); font-size: 12px; letter-spacing: .12em; }
  nav a { color: var(--dim); transition: color .2s; }
  nav a:hover { color: var(--cyan); }

  /* ---------- hero ---------- */
  .hero {
    position: relative;
    overflow: hidden;
    border-bottom: 1px solid var(--line);
  }
  .hero-grid {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 460px);
    gap: 40px;
    align-items: center;
    padding: 72px 0 64px;
  }
  .eyebrow {
    font-family: var(--mono); font-size: 12px; letter-spacing: .22em;
    color: var(--amber); text-transform: uppercase;
    margin-bottom: 18px;
  }
  h1 {
    font-size: clamp(40px, 6vw, 64px);
    line-height: 1.02;
    font-weight: 700;
    letter-spacing: -.02em;
  }
  h1 .thin { color: var(--dim); font-weight: 400; }
  .hero p.lede {
    margin-top: 22px;
    max-width: 52ch;
    color: var(--dim);
    font-size: 17px;
  }
  .hero p.lede strong { color: var(--text); font-weight: 500; }
  .hero-cta {
    margin-top: 34px; display: flex; gap: 14px; flex-wrap: wrap;
  }
  .btn {
    font-family: var(--mono); font-size: 13px; letter-spacing: .1em;
    padding: 12px 22px; border: 1px solid var(--cyan);
    color: var(--cyan); background: transparent; cursor: pointer;
    transition: background .2s, color .2s;
  }
  .btn:hover { background: var(--cyan); color: var(--void); }
  .btn.ghost { border-color: var(--line); color: var(--dim); }
  .btn.ghost:hover { border-color: var(--dim); color: var(--text); background: transparent; }

  /* ---------- orbital system (signature) ---------- */
  .orbital { position: relative; aspect-ratio: 1 / 1; width: 100%; max-width: 460px; margin-inline: auto; }

  .ring, .orbit-track, .core, .core-halo {
    position: absolute; top: 50%; left: 50%;
    transform: translate(-50%, -50%);
    border-radius: 50%;
  }
  .ring { border: 1px solid rgba(120, 170, 255, .22); }
  .ring.r1 { width: 30%; height: 30%; }
  .ring.r2 { width: 50%; height: 50%; }
  .ring.r3 { width: 70%; height: 70%; }
  .ring.r4 { width: 90%; height: 90%; }

  .ring-label {
    position: absolute; left: 50%;
    transform: translate(-50%, -50%);
    font-family: var(--mono); font-size: 10px; letter-spacing: .2em;
    color: var(--dim); text-transform: uppercase;
    background: var(--void); padding: 0 8px;
    white-space: nowrap; z-index: 2;
  }
  .ring-label.l1 { top: 35%; }
  .ring-label.l2 { top: 25%; }
  .ring-label.l3 { top: 15%; }
  .ring-label.l4 { top: 5%; }

  .core { width: 22px; height: 22px; background: var(--amber); z-index: 3; }
  .core-halo { width: 48px; height: 48px; border: 1px solid var(--amber); opacity: .35; }

  .orbit-track { width: 100%; height: 100%; }

  .moon {
    position: absolute; left: 50%;
    transform: translate(-50%, -50%);
    border-radius: 50%; background: var(--cyan);
    width: 12px; height: 12px; z-index: 3;
  }
  .moon.alt { background: var(--text); width: 9px; height: 9px; }
  .moon.m1 { top: 35%; }
  .moon.m2 { top: 25%; }
  .moon.m3 { top: 15%; }
  .moon.m3b { top: 85%; }
  .moon.m4 { top: 5%; }

  @media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
  }

  /* ---------- section headers ---------- */
  section { padding: 72px 0; }
  .sec-head {
    display: flex; align-items: baseline; justify-content: space-between;
    gap: 16px; margin-bottom: 40px; flex-wrap: wrap;
  }
  h2 {
    font-size: 28px; font-weight: 600; letter-spacing: -.01em;
  }
  .sec-head .count {
    font-family: var(--mono); font-size: 12px; letter-spacing: .15em;
    color: var(--dim);
  }

  /* ---------- filters ---------- */
  .filters { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 32px; }
  .chip {
    font-family: var(--mono); font-size: 12px; letter-spacing: .08em;
    padding: 7px 14px; border: 1px solid var(--line);
    background: transparent; color: var(--dim); cursor: pointer;
    transition: color .2s, border-color .2s;
  }
  .chip:hover { color: var(--text); border-color: var(--dim); }
  .chip.on { color: var(--void); background: var(--cyan); border-color: var(--cyan); }

  /* ---------- project grid ---------- */
  .grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 20px;
  }
  .card {
    border: 1px solid var(--line);
    background: linear-gradient(160deg, var(--panel), var(--navy) 70%);
    padding: 26px 26px 24px;
    display: flex; flex-direction: column; gap: 14px;
    transition: border-color .25s, transform .25s;
  }
  .card:hover { border-color: rgba(79, 216, 235, .45); transform: translateY(-3px); }
  @media (prefers-reduced-motion: reduce) { .card:hover { transform: none; } }

  .card-top {
    display: flex; justify-content: space-between; align-items: center; gap: 12px;
    font-family: var(--mono); font-size: 11px; letter-spacing: .14em;
    text-transform: uppercase;
  }
  .card-top .host { color: var(--dim); }
  .card-top .host b { color: var(--amber); font-weight: 500; }
  .status { display: inline-flex; align-items: center; gap: 7px; }
  .status .dot { width: 7px; height: 7px; border-radius: 50%; }
  .status.orbit  { color: var(--cyan); }  .status.orbit  .dot { background: var(--cyan); box-shadow: 0 0 8px var(--cyan); }
  .status.launch { color: var(--amber); } .status.launch .dot { background: var(--amber); box-shadow: 0 0 8px var(--amber); }
  .status.docked { color: var(--dim); }   .status.docked .dot { background: var(--dim); }

  .card h3 { font-size: 21px; font-weight: 600; letter-spacing: -.01em; }
  .card p { color: var(--dim); font-size: 14.5px; flex: 1; }
  .card { color: inherit; text-decoration: none; }
  .tags { display: flex; flex-wrap: wrap; gap: 8px; }
  .tag {
    font-family: var(--mono); font-size: 11px;
    color: var(--cyan); border: 1px solid rgba(79, 216, 235, .25);
    padding: 3px 9px;
  }
  .card .more {
    font-family: var(--mono); font-size: 12px; letter-spacing: .1em;
    color: var(--cyan); margin-top: 4px; opacity: 0; transition: opacity .2s;
  }
  .card:hover .more, .card:focus-visible .more { opacity: 1; }

  /* ---------- project detail (dossier) ---------- */
  #detail { padding: 64px 0 80px; }
  .back {
    display: inline-block; font-family: var(--mono); font-size: 12px;
    letter-spacing: .12em; color: var(--dim); margin-bottom: 36px;
  }
  .back:hover { color: var(--cyan); }
  .dossier-head { border-bottom: 1px solid var(--line); padding-bottom: 28px; margin-bottom: 36px; }
  .dossier-meta {
    display: flex; gap: 22px; flex-wrap: wrap; align-items: center;
    font-family: var(--mono); font-size: 12px; letter-spacing: .14em;
    text-transform: uppercase; color: var(--dim); margin-bottom: 16px;
  }
  .dossier-meta .host b { color: var(--amber); font-weight: 500; }
  .dossier-head h1 { font-size: clamp(32px, 5vw, 48px); }
  .dossier-grid {
    display: grid; grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    gap: 56px; align-items: start;
  }
  .dossier-brief p { color: var(--dim); max-width: 62ch; }
  .dossier-brief p + p { margin-top: 16px; }
  .dossier-brief p strong { color: var(--text); font-weight: 500; }
  .side-block + .side-block { margin-top: 36px; }
  .side-label {
    font-family: var(--mono); font-size: 11px; letter-spacing: .22em;
    color: var(--amber); text-transform: uppercase; margin-bottom: 14px;
  }
  .hl { list-style: none; }
  .hl li {
    position: relative; padding: 10px 0 10px 22px;
    border-bottom: 1px solid var(--line); color: var(--dim); font-size: 14.5px;
  }
  .hl li::before { content: "◆"; position: absolute; left: 0; top: 11px; color: var(--cyan); font-size: 10px; }
  .dossier-links a {
    display: block; font-family: var(--mono); font-size: 13px; letter-spacing: .08em;
    padding: 11px 0; border-bottom: 1px solid var(--line);
  }
  .dossier-links a:hover { color: var(--amber); }
  @media (max-width: 900px) { .dossier-grid { grid-template-columns: 1fr; gap: 36px; } }

  /* ---------- about ---------- */
  .about {
    border-top: 1px solid var(--line);
    background: var(--navy);
  }
  .about-grid {
    display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
    gap: 48px;
  }
  .about p { color: var(--dim); max-width: 58ch; }
  .about p + p { margin-top: 16px; }
  .about p strong { color: var(--text); font-weight: 500; }
  .fleet { font-family: var(--mono); font-size: 13px; }
  .fleet-row {
    display: flex; justify-content: space-between; gap: 16px;
    padding: 12px 0; border-bottom: 1px solid var(--line);
  }
  .fleet-row:first-child { border-top: 1px solid var(--line); }
  .fleet-row .name { color: var(--cyan); }
  .fleet-row .role { color: var(--dim); text-align: right; }

  /* ---------- footer ---------- */
  footer {
    border-top: 1px solid var(--line);
    padding: 36px 0;
    display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap;
    font-family: var(--mono); font-size: 12px; letter-spacing: .12em;
    color: var(--dim);
  }
  footer .sig b { color: var(--cyan); font-weight: 500; }

  @media (max-width: 900px) {
    .hero-grid { grid-template-columns: 1fr; padding: 56px 0 48px; }
    .orbital { max-width: 360px; }
    .about-grid { grid-template-columns: 1fr; }
    nav { display: none; }
  }

/* ---------- language switcher ---------- */
.bar-right { display: flex; align-items: center; gap: 26px; }
.lang { display: flex; gap: 4px; }
.lang button {
  font-family: var(--mono); font-size: 11px; letter-spacing: .1em;
  background: transparent; border: 1px solid var(--line);
  color: var(--dim); padding: 4px 10px; cursor: pointer;
  transition: color .2s, border-color .2s;
}
.lang button:hover { color: var(--text); border-color: var(--dim); }
.lang button.on { color: var(--void); background: var(--cyan); border-color: var(--cyan); }

/* ---------- detail interactions ---------- */
#about-title { margin-bottom: 24px; }

#fleet-label { margin-bottom: 14px; }

footer .wrap {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  width: 100%;
}