:root {
  --ink: #0a2a3d;
  --navy: #01517d;
  --teal: #45b4c4;
  --grey: #e3e7ea;
  --paper: #ffffff;
  --muted: #5d7686;
  --display: "Space Grotesk", system-ui, sans-serif;
  --body: "IBM Plex Sans", system-ui, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, monospace;
  --gutter: clamp(1.25rem, 5vw, 4rem);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--body);
  font-size: 1.0625rem;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--navy); }

h1, h2, h3 { font-family: var(--display); font-weight: 700; letter-spacing: -0.02em; }

/* ---------- top bar ---------- */

.bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.25rem var(--gutter);
}

.mark { width: clamp(74px, 9vw, 104px); height: auto; display: block; }

.bar-link {
  font-family: var(--mono);
  font-size: 0.8125rem;
  letter-spacing: 0.02em;
  text-decoration: none;
  color: var(--muted);
}

.bar-link:hover { color: var(--navy); }

/* ---------- hero ---------- */

.hero { padding: clamp(2rem, 6vw, 4.5rem) var(--gutter) clamp(3rem, 8vw, 6rem); }

.eyebrow {
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--teal);
  margin: 0 0 1.75rem;
}

.hero h1 {
  margin: 0;
  font-size: clamp(2.3rem, 6.4vw, 4.6rem);
  line-height: 1.03;
  max-width: 16ch;
}

.hero h1 .accent { color: var(--navy); }

.lede {
  margin: 1.75rem 0 0;
  max-width: 48ch;
  font-size: clamp(1.0625rem, 1.6vw, 1.25rem);
  color: var(--muted);
}

.tiles {
  display: grid;
  grid-template-columns: repeat(24, 1fr);
  gap: 3px;
  margin: clamp(2.5rem, 6vw, 4rem) 0 1.5rem;
  max-width: 780px;
}

.tile {
  aspect-ratio: 1;
  border-radius: 1px;
  opacity: 0;
  animation: settle 460ms ease-out forwards;
}

.tile.grey { background: var(--grey); }
.tile.navy { background: var(--navy); }
.tile.teal { background: var(--teal); }

@keyframes settle {
  from { opacity: 0; transform: translateY(-5px); }
  to   { opacity: 1; transform: none; }
}

.proof {
  font-family: var(--mono);
  font-size: 0.875rem;
  color: var(--muted);
  margin: 0;
  letter-spacing: 0.01em;
}

.proof strong { color: var(--navy); font-size: 1.05rem; }

/* ---------- sections ---------- */

.band { padding: clamp(3rem, 7vw, 5.5rem) var(--gutter); }

.band.alt { background: #f5f8f9; }

.col { max-width: 62ch; }

.band h2, .contact h2 {
  font-size: clamp(1.5rem, 3vw, 2.1rem);
  margin: 0 0 1.5rem;
  line-height: 1.15;
}

.band p { margin: 0 0 1.1rem; }

.pull {
  font-family: var(--display);
  font-size: 1.2rem;
  color: var(--navy);
  border-top: 2px solid var(--teal);
  padding-top: 1.1rem;
  margin-top: 2rem;
}

.standards {
  font-family: var(--mono);
  font-size: 0.8125rem;
  letter-spacing: 0.06em;
  color: var(--navy);
  border-top: 1px solid var(--teal);
  padding-top: 0.9rem;
  margin-top: 1.75rem;
}

/* ---------- steps ---------- */

.steps {
  list-style: none;
  margin: 2.5rem 0 0;
  padding: 0;
  display: grid;
  gap: 2.25rem;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
}

.steps li { border-top: 1px solid var(--grey); padding-top: 1.1rem; }

.steps .num {
  font-family: var(--mono);
  font-size: 0.8125rem;
  color: var(--teal);
  letter-spacing: 0.1em;
}

.steps h3 { font-size: 1.0625rem; margin: 0.6rem 0 0.5rem; }

.steps p { margin: 0; font-size: 0.9375rem; color: var(--muted); }

.trace {
  margin: clamp(2.5rem, 6vw, 3.5rem) 0 0;
  padding: 1.5rem 1.5rem 1.4rem;
  background: var(--paper);
  border: 1px solid var(--grey);
  max-width: 62ch;
}

.trace figcaption {
  font-family: var(--mono);
  font-size: 0.6875rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--teal);
}

.trace-row {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.5rem 1.25rem;
  font-family: var(--mono);
  margin: 0.9rem 0 1.1rem;
  padding-bottom: 1.1rem;
  border-bottom: 1px solid var(--grey);
}

.trace-id { font-size: 1.25rem; font-weight: 500; color: var(--ink); }

.trace-src { font-size: 0.8125rem; color: var(--muted); }

.trace-val {
  font-size: 1.25rem;
  color: var(--navy);
  margin-left: auto;
}

.trace p { margin: 0; font-size: 0.9375rem; color: var(--muted); }

/* ---------- cards ---------- */

.cards {
  list-style: none;
  margin: 2.5rem 0 0;
  padding: 0;
  display: grid;
  gap: 1.75rem 2.25rem;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.cards h3 { font-size: 1rem; margin: 0 0 0.4rem; color: var(--navy); }

.cards p { margin: 0; font-size: 0.9375rem; color: var(--muted); }

.slot {
  font-family: var(--mono);
  font-size: 1rem;
  color: var(--navy);
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.75rem;
  padding: 0.9rem 1.1rem;
  background: #eef6f8;
  border-left: 3px solid var(--teal);
  margin-bottom: 1.75rem !important;
}

.slot-q {
  font-size: 0.6875rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: #fff;
  background: var(--navy);
  padding: 0.25rem 0.55rem;
}

/* ---------- contact ---------- */

.contact {
  background: var(--navy);
  color: #fff;
  padding: clamp(3.5rem, 8vw, 6rem) var(--gutter);
}

.contact h2 { color: #fff; }

.contact p { color: rgba(255, 255, 255, 0.82); margin: 0 0 1.1rem; }

.lines { display: flex; flex-wrap: wrap; gap: 1rem 2.5rem; margin-top: 2rem !important; }

.lines a {
  font-family: var(--mono);
  font-size: 1.05rem;
  color: #fff;
  text-decoration: none;
  border-bottom: 2px solid var(--teal);
  padding-bottom: 3px;
}

.lines a:hover { color: var(--teal); }

/* ---------- footer ---------- */

footer {
  padding: 2rem var(--gutter) 3rem;
  font-size: 0.8125rem;
  color: var(--muted);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.5rem 2rem;
}

footer p { margin: 0; }

footer .tag { font-family: var(--mono); color: var(--teal); }

/* ---------- accessibility ---------- */

a:focus-visible {
  outline: 3px solid var(--teal);
  outline-offset: 3px;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .tile { animation: none; opacity: 1; }
}

@media (max-width: 540px) {
  .tiles { grid-template-columns: repeat(16, 1fr); }
  .hero h1 { max-width: none; }
}