*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  background: #0c1218;
  color: #b8c4d0;
  line-height: 1.65;
  min-height: 100vh;
  padding-top: 24px;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

:root {
  --bg: #0c1218;
  --panel: #141c26;
  --ink: #e4eaf0;
  --muted: #7a8a9a;
  --fix: #3ddc97;
  --amber: #f0b429;
  --line: #1e2a38;
  --mono: ui-monospace, 'Cascadia Code', Menlo, Consolas, monospace;
}

/* ——— PRN CHIPS top-right stack (not full rail, not mile markers, not horizon) ——— */
.prn {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 100;
  display: flex;
  flex-direction: column;
  gap: 6px;
  align-items: flex-end;
}
.prn a {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--panel);
  border: 1px solid var(--line);
  padding: 8px 12px;
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--muted);
  transition: all 0.15s;
  min-width: 110px;
  justify-content: space-between;
}
.prn a .id {
  color: var(--fix);
  font-weight: 700;
  letter-spacing: 0.04em;
}
.prn a .lab {
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 600;
}
.prn a:hover {
  border-color: var(--fix);
  color: var(--ink);
}
.prn a.on {
  background: var(--fix);
  border-color: var(--fix);
  color: #0c1218;
}
.prn a.on .id { color: #0c1218; }

.logo {
  position: fixed;
  top: 22px;
  left: 24px;
  z-index: 90;
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--fix);
}
.logo strong {
  display: block;
  font-size: 1rem;
  color: var(--ink);
  letter-spacing: 0.06em;
  margin-bottom: 2px;
}

/* ——— FIX: big accuracy HUD ——— */
.fix {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 100px 28px 48px;
  max-width: 720px;
}
.fix .hud {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  margin-bottom: 20px;
  font-family: var(--mono);
}
.fix .hud .val {
  font-size: clamp(2.5rem, 8vw, 4rem);
  font-weight: 700;
  color: var(--fix);
  line-height: 1;
  letter-spacing: -0.03em;
}
.fix .hud .unit {
  font-size: 1rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.12em;
}
.fix h1 {
  font-size: clamp(1.4rem, 3vw, 1.9rem);
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 12px;
  max-width: 22ch;
  line-height: 1.25;
}
.fix p {
  color: var(--muted);
  max-width: 46ch;
  margin-bottom: 14px;
  font-size: 1.02rem;
}
.fix .chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
}
.fix .chips span {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 6px 10px;
  border: 1px solid var(--line);
  color: var(--muted);
  background: var(--panel);
}

/* ——— PLOT: 2x2 process tiles (asymmetric sizes — not equal grid-4) ——— */
.plot {
  padding: 100px 28px 64px;
  max-width: 800px;
}
.plot .k {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--fix);
  margin-bottom: 8px;
}
.plot h1 {
  font-size: 1.6rem;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 28px;
}
.mosaic {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  grid-template-rows: auto auto;
  gap: 12px;
}
.mosaic .tile {
  background: var(--panel);
  border: 1px solid var(--line);
  padding: 22px 20px;
}
.mosaic .tile.wide {
  grid-column: 1 / -1;
}
.mosaic .tile .n {
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--amber);
  font-weight: 700;
  margin-bottom: 8px;
}
.mosaic .tile h2 {
  font-size: 1.05rem;
  color: var(--ink);
  font-weight: 600;
  margin-bottom: 6px;
}
.mosaic .tile p {
  font-size: 0.9rem;
  color: var(--muted);
}
.plot-fig {
  margin-top: 28px;
  border: 1px solid var(--line);
}
.plot-fig img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  filter: saturate(0.85) contrast(1.05);
}

/* ——— DATUM: definition blocks ——— */
.datum {
  padding: 100px 28px 64px;
  max-width: 560px;
}
.datum .k {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--fix);
  margin-bottom: 8px;
}
.datum h1 {
  font-size: 1.6rem;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 24px;
}
.def {
  border-top: 1px solid var(--line);
  padding: 18px 0;
}
.def:last-child { border-bottom: 1px solid var(--line); }
.def dt {
  font-family: var(--mono);
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--amber);
  letter-spacing: 0.06em;
  margin-bottom: 6px;
}
.def dd {
  color: var(--muted);
  font-size: 0.95rem;
}

/* ——— CALL: radio panel ——— */
.call {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 100px 20px 48px;
}
.radio {
  width: 100%;
  max-width: 400px;
  background: var(--panel);
  border: 1px solid var(--line);
  padding: 8px;
}
.radio .face {
  border: 1px solid var(--line);
  padding: 28px 24px;
  background: #0a1016;
}
.radio .led {
  display: flex;
  gap: 6px;
  margin-bottom: 16px;
}
.radio .led i {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--line);
}
.radio .led i.on { background: var(--fix); box-shadow: 0 0 8px var(--fix); }
.radio h1 {
  font-family: var(--mono);
  font-size: 1rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink);
  margin-bottom: 12px;
}
.radio .meta {
  font-size: 0.88rem;
  color: var(--muted);
  line-height: 1.7;
  margin-bottom: 20px;
}
.radio .meta a { color: var(--fix); font-weight: 600; }
.radio label {
  display: block;
  font-family: var(--mono);
  font-size: 0.62rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 4px;
}
.radio input,
.radio textarea {
  width: 100%;
  padding: 10px 12px;
  background: var(--bg);
  border: 1px solid var(--line);
  color: var(--ink);
  font-family: inherit;
  font-size: 0.95rem;
  margin-bottom: 12px;
}
.radio input:focus,
.radio textarea:focus {
  outline: none;
  border-color: var(--fix);
}
.radio textarea { min-height: 88px; resize: vertical; }
.radio button {
  width: 100%;
  padding: 12px;
  background: var(--fix);
  color: #0c1218;
  border: none;
  font-family: var(--mono);
  font-weight: 700;
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  cursor: pointer;
}
.radio button:hover { filter: brightness(1.08); }

.ft {
  padding: 16px 28px;
  font-family: var(--mono);
  font-size: 0.68rem;
  color: var(--muted);
  border-top: 1px solid var(--line);
}
.ft strong { color: var(--ink); }

@media (max-width: 600px) {
  .prn {
    top: auto;
    bottom: 0;
    left: 0;
    right: 0;
    flex-direction: row;
    align-items: stretch;
    gap: 0;
    background: var(--panel);
    border-top: 1px solid var(--line);
  }
  .prn a {
    flex: 1;
    min-width: 0;
    justify-content: center;
    flex-direction: column;
    gap: 2px;
    border: none;
    border-right: 1px solid var(--line);
    border-radius: 0;
    padding: 10px 4px;
  }
  .prn a:last-child { border-right: none; }
  .logo { left: 14px; top: 14px; }
  body { padding-bottom: 70px; }
  .mosaic { grid-template-columns: 1fr; }
  .mosaic .tile.wide { grid-column: auto; }
}