/* Cleared to Know — Palantir-inspired visual exploration.
   Original aviation imagery, cinematic scale, monochrome enterprise surfaces. */

:root {
  --black: #0b0b0c;
  --black-soft: #181819;
  --paper: #efefed;
  --panel: #f8f8f6;
  --white: #ffffff;
  --ink: #171718;
  --muted: #686866;
  --line: #b9b9b5;
  --line-dark: #373738;
  --success: #255d45;
  --warning: #b88a20;
  --sans: "Helvetica Neue", Helvetica, Arial, sans-serif;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 1rem;
  line-height: 1.48;
  text-rendering: optimizeLegibility;
}
.mono { font-family: var(--mono); letter-spacing: 0.025em; }
a { color: inherit; text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { text-decoration-style: solid; }
a:focus-visible { outline: 2px solid currentColor; outline-offset: 3px; }
img { max-width: 100%; }

/* ---------- floating navigation ---------- */
.topbar {
  position: absolute;
  z-index: 10;
  top: 1.25rem;
  left: 1.5rem;
  right: 1.5rem;
  min-height: 4.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.6rem 0.75rem 0.6rem 1rem;
  background: rgba(18, 18, 19, 0.82);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 0.65rem;
  color: var(--white);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
}
.brand {
  display: inline-flex;
  align-items: center;
  color: var(--white);
  font-size: 1rem;
  font-weight: 500;
  text-decoration: none;
}
.brand:hover { color: var(--white); text-decoration: none; }
.brand-mark {
  width: 1.75rem;
  height: 1.75rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-right: 0.65rem;
  border: 1px solid rgba(255,255,255,0.75);
  border-radius: 50%;
  color: var(--white);
  font-family: var(--mono);
  font-size: 0.52rem;
  font-weight: 600;
}
.brand-sub { margin-left: 0.35rem; color: rgba(255,255,255,0.58); font-weight: 400; }
.topbar nav { display: flex; align-items: center; gap: 0.5rem; }
.topbar nav a {
  min-height: 2.75rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 1.25rem;
  color: var(--white);
  border: 1px solid rgba(255,255,255,0.2);
  font-size: 0.82rem;
  text-decoration: none;
}
.topbar nav a:hover { background: rgba(255,255,255,0.12); }
.topbar nav a:last-child { background: var(--white); color: var(--black); border-color: var(--white); }
.topbar nav a:last-child:hover { background: #dededb; }

main { width: 100%; margin: 0; padding: 0 0 5rem; }

/* ---------- cinematic hero ---------- */
.hero,
.dhero {
  min-height: 44rem;
  margin: 0;
  padding: 8rem clamp(1.5rem, 7vw, 7rem) 4rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background-color: rgba(0,0,0,0.46);
  background-image: url("aviation-operations-hero.png");
  background-position: center;
  background-size: cover;
  background-blend-mode: multiply;
  color: var(--white);
  text-align: center;
}
.dhero { min-height: 34rem; background-position: center 45%; }
.kicker { display: none; }
.hero h1,
.dhero h1 {
  max-width: 72rem;
  margin: 0;
  color: var(--white);
  font-size: clamp(3.5rem, 9.5vw, 8rem);
  font-weight: 300;
  line-height: 0.92;
  letter-spacing: -0.065em;
  text-wrap: balance;
}
.dhero h1 { font-size: clamp(3.5rem, 8vw, 6.75rem); }
.hero-sub {
  display: block;
  margin-top: 0.6rem;
  color: rgba(255,255,255,0.9);
  font-size: 0.48em;
  font-weight: 300;
  letter-spacing: -0.035em;
}
.lede {
  max-width: 52rem;
  margin: 2rem 0 0;
  color: rgba(255,255,255,0.86);
  font-size: clamp(1rem, 1.8vw, 1.25rem);
  line-height: 1.55;
}
.lede a { color: var(--white); }

/* ---------- home: editorial indexes ---------- */
.domains {
  width: min(calc(100% - 4rem), 74rem);
  margin: 5rem auto 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid var(--ink);
}
.domain-card {
  min-height: 22rem;
  display: flex;
  flex-direction: column;
  padding: 2rem;
  color: var(--ink);
  border-bottom: 1px solid var(--line);
  text-decoration: none;
  transition: background-color 150ms ease, color 150ms ease;
}
.domain-card + .domain-card { border-left: 1px solid var(--line); }
.domain-card h2 {
  max-width: 30rem;
  margin: auto 0 1rem;
  color: inherit;
  font-size: clamp(2.25rem, 5vw, 4.25rem);
  font-weight: 300;
  line-height: 0.98;
  letter-spacing: -0.055em;
}
.domain-card p { max-width: 31rem; margin: 0.35rem 0; color: var(--muted); font-size: 0.95rem; }
.domain-card.live:hover { background: var(--black); color: var(--white); }
.domain-card.live:hover p { color: rgba(255,255,255,0.72); }
.domain-card.ghost { color: #777774; }
.domain-card.ghost h2 { color: inherit; }
.card-top { display: flex; justify-content: space-between; color: inherit; font-size: 0.68rem; text-transform: uppercase; }
.status-live { color: var(--success); font-weight: 600; }
.domain-card.live:hover .status-live { color: #78b697; }
.status-soon { color: var(--muted); }
.card-count { margin-top: 1.25rem !important; color: inherit !important; font-size: 0.68rem !important; }

.tier-explain {
  margin-top: 5rem;
  padding: clamp(4rem, 9vw, 8rem) clamp(2rem, 8vw, 8rem);
  background: var(--black);
  color: var(--white);
  border-top: 1px solid var(--line-dark);
  border-bottom: 1px solid var(--line-dark);
}
.tier-explain h2 { margin: 0 0 1.5rem; color: rgba(255,255,255,0.55); font-size: 0.68rem; letter-spacing: 0.08em; }
.tier-explain p {
  max-width: 70rem;
  margin: 0;
  color: var(--white);
  font-size: clamp(1.7rem, 4vw, 3.75rem);
  font-weight: 300;
  line-height: 1.1;
  letter-spacing: -0.04em;
}
.tier-explain a { color: var(--white); }

/* ---------- tier chips ---------- */
.chip {
  display: inline-block;
  padding: 0.3rem 0.65rem;
  border: 1px solid currentColor;
  border-radius: 0;
  font-family: var(--mono);
  font-size: 0.64rem;
  letter-spacing: 0.06em;
  vertical-align: middle;
}
.chip-private,
.chip-instrument,
.chip-commercial { background: transparent; color: var(--ink); }
.chip-cfi { background: var(--warning); color: var(--black); border-color: var(--warning); }

/* ---------- domain index ---------- */
.tier-band { width: min(calc(100% - 4rem), 74rem); margin: 4rem auto; }
.tier-band > h2 { margin: 0 0 1rem; }
.cardgrid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(18rem, 1fr));
  border-top: 1px solid var(--ink);
}
.card {
  min-height: 17rem;
  display: flex;
  flex-direction: column;
  padding: 1.5rem;
  color: var(--ink);
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  text-decoration: none;
  transition: background-color 150ms ease, color 150ms ease;
}
.card:first-child { border-left: 1px solid var(--line); }
.card:hover { background: var(--black); color: var(--white); }
.card h3 {
  margin: auto 0 0.65rem;
  color: inherit;
  font-size: 1.8rem;
  font-weight: 300;
  line-height: 1.05;
  letter-spacing: -0.035em;
}
.card p { margin: 0; color: var(--muted); font-size: 0.9rem; }
.card:hover p { color: rgba(255,255,255,0.68); }

/* ---------- article header ---------- */
.bpass {
  width: min(calc(100% - 4rem), 74rem);
  min-height: 31rem;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 16rem;
  margin: 7rem auto 5rem;
  background: var(--black);
  color: var(--white);
  border: 1px solid var(--line-dark);
}
.bpass-main { min-width: 0; padding: clamp(3rem, 7vw, 6rem); }
.bpass-route { margin-bottom: 4rem; color: rgba(255,255,255,0.55); font-size: 0.68rem; }
.bpass h1 {
  max-width: 52rem;
  margin: 0 0 2rem;
  color: var(--white);
  font-size: clamp(3rem, 7vw, 6.5rem);
  font-weight: 300;
  line-height: 0.95;
  letter-spacing: -0.06em;
}
.bpass-meta { display: flex; align-items: center; gap: 1rem; }
.bpass .chip-private,
.bpass .chip-instrument,
.bpass .chip-commercial { color: var(--white); }
.meta-date { color: rgba(255,255,255,0.55); font-size: 0.68rem; }
.bpass-stub {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 0.85rem;
  padding: 2rem;
  border-left: 1px solid var(--line-dark);
  background: var(--black-soft);
}
.stub-row { display: flex; justify-content: space-between; font-size: 0.68rem; }
.stub-k { color: rgba(255,255,255,0.42); }
.stub-v { color: var(--white); font-weight: 600; }

/* ---------- article prose ---------- */
.prose,
.sources,
.edges { width: min(calc(100% - 3rem), 46rem); margin-left: auto; margin-right: auto; }
.prose { font-size: 1.08rem; line-height: 1.65; }
.prose h2 { margin: 3.5rem 0 0.85rem; color: var(--ink); font-size: 2rem; font-weight: 400; line-height: 1.15; letter-spacing: -0.025em; }
.prose h3 { margin: 2.4rem 0 0.6rem; color: var(--ink); font-size: 1.3rem; font-weight: 500; }
.prose p { margin: 1.05rem 0; }
.prose blockquote { margin: 2rem 0; padding: 1.5rem; background: var(--black); color: var(--white); border: 0; }
.prose blockquote p { margin: 0; }
.prose code { padding: 0.12em 0.3em; background: #dededb; border: 1px solid var(--line); border-radius: 0; font-family: var(--mono); font-size: 0.86em; }
.prose pre { overflow-x: auto; padding: 1.5rem; background: var(--black); color: var(--white); }
.prose pre code { padding: 0; background: none; border: 0; color: inherit; }
.prose ul,
.prose ol { padding-left: 1.5rem; }
.prose li { margin: 0.4rem 0; }
.prose hr { margin: 3rem 0; border: 0; border-top: 1px solid var(--line); }
.prose a.ref { font-weight: 600; }
.tablewrap { overflow-x: auto; margin: 2rem 0; }
.tablewrap table { min-width: 28rem; border-collapse: collapse; background: var(--panel); font-size: 0.9rem; }
.tablewrap th { padding: 0.8rem 1rem; background: var(--black); color: var(--white); font-size: 0.72rem; font-weight: 500; text-align: left; text-transform: uppercase; }
.tablewrap td { padding: 0.8rem 1rem; border-bottom: 1px solid var(--line); }
.tablewrap tbody tr:hover { background: #dededb; }

/* ---------- figures ---------- */
.figure { margin: 2.5rem 0; }
.figure img,
.figure svg { display: block; width: 100%; height: auto; background: var(--panel); border: 1px solid var(--line); }
.figure-svg { overflow-x: auto; }
.figure figcaption { margin-top: 0.7rem; color: var(--muted); font-size: 0.86rem; line-height: 1.5; }
.figure figcaption code { font-size: 0.8em; }

/* ---------- sources + relationship graph ---------- */
.sources { margin-top: 4rem; font-size: 0.9rem; }
.sources h2,
.edges-title { margin: 0 0 0.8rem; color: var(--muted); font-size: 0.68rem; letter-spacing: 0.08em; }
.sources ul { margin: 0; padding-left: 1.25rem; }
.sources li { margin: 0.4rem 0; }
.edges { margin-top: 4rem; padding: 2rem; background: var(--black); color: var(--white); border: 1px solid var(--line-dark); }
.edges-title { color: rgba(255,255,255,0.52); }
.edge-group { margin-top: 1.4rem; }
.edge-group h3 { margin: 0 0 0.35rem; color: var(--white); font-size: 0.68rem; letter-spacing: 0.08em; text-transform: uppercase; }
.edge-note { margin: 0 0 0.45rem; color: rgba(255,255,255,0.55); font-size: 0.84rem; }
.edge-group ul { margin: 0; padding: 0; list-style: none; }
.edge-group li { margin: 0.4rem 0; }

/* ---------- footer ---------- */
.foot { margin-top: 0; background: var(--black); color: var(--white); border-top: 1px solid var(--line-dark); }
.foot-inner { width: min(calc(100% - 4rem), 74rem); margin: 0 auto; padding: 4rem 0; font-size: 0.9rem; }
.foot a { color: var(--white); }
.foot p { margin: 0.35rem 0; }
.foot .mono { color: rgba(255,255,255,0.48); font-size: 0.68rem; }

/* ---------- responsive ---------- */
@media (max-width: 48rem) {
  .topbar { top: 0.75rem; left: 0.75rem; right: 0.75rem; min-height: 3.75rem; padding: 0.45rem 0.5rem 0.45rem 0.75rem; }
  .brand { font-size: 0.88rem; }
  .brand-sub { display: none; }
  .brand-mark { width: 1.5rem; height: 1.5rem; margin-right: 0.5rem; font-size: 0.46rem; }
  .topbar nav { gap: 0.3rem; }
  .topbar nav a { min-height: 2.75rem; padding: 0 0.6rem; font-size: 0.7rem; }
  .hero,
  .dhero { min-height: 42rem; padding: 7rem 1.5rem 3rem; background-color: rgba(0,0,0,0.58); background-position: 48% center; }
  .domains { width: calc(100% - 2rem); grid-template-columns: 1fr; }
  .domain-card { min-height: 19rem; padding: 1.5rem; }
  .domain-card + .domain-card { border-left: 0; }
  .tier-band { width: calc(100% - 2rem); }
  .cardgrid { grid-template-columns: 1fr; }
  .card { border-left: 1px solid var(--line); }
  .bpass { width: calc(100% - 2rem); grid-template-columns: 1fr; margin-top: 6rem; }
  .bpass-main { padding: 3rem 1.5rem; }
  .bpass-route { margin-bottom: 2rem; }
  .bpass-stub { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); border-left: 0; border-top: 1px solid var(--line-dark); }
  .foot-inner { width: calc(100% - 2rem); }
}

@media (max-width: 25rem) {
  .hero h1 { font-size: 3.25rem; }
  .hero .lede { font-size: 0.98rem; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; }
}

/* Keep all article navigation links reachable on narrow screens. */
@media (max-width: 48rem) {
  .topbar { flex-wrap: wrap; gap: 0.5rem; }
  .topbar nav { flex-wrap: wrap; }
  .bpass { margin-top: 9rem; }
}
@media (max-width: 30rem) {
  .topbar nav { width: 100%; }
  .topbar nav a { flex: 1; }
  .hero, .dhero { padding-top: 10rem; }
}