:root {
  --iron: #151515;
  --steel: #2a2a2a;
  --ash: #f4f0e8;
  --paper: #fffaf1;
  --rust: #b46535;
  --line: rgba(21, 21, 21, 0.16);
  --muted: #5f5a52;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  color: var(--iron);
  background: var(--paper);
  line-height: 1.6;
}

a { color: inherit; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem clamp(1rem, 4vw, 4rem);
  background: rgba(21, 21, 21, 0.96);
  color: #fff;
  border-bottom: 1px solid rgba(255, 255, 255, 0.14);
}

.brand {
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  text-decoration: none;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 1.1rem;
  font-size: 0.9rem;
}

.site-nav a {
  text-decoration: none;
  opacity: 0.86;
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  opacity: 1;
  color: #f2c69d;
}

.nav-toggle {
  display: none;
  border: 1px solid rgba(255,255,255,.28);
  background: transparent;
  color: #fff;
  padding: .45rem .7rem;
  border-radius: 999px;
}

.hero {
  padding: clamp(4rem, 10vw, 7rem) clamp(1.25rem, 6vw, 6rem);
  background:
    linear-gradient(rgba(21,21,21,.78), rgba(21,21,21,.7)),
    radial-gradient(circle at top right, rgba(180,101,53,.38), transparent 36%),
    var(--iron);
  color: #fff;
}

.eyebrow {
  color: #f2c69d;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
  margin: 0 0 .75rem;
}

h1, h2, h3 { line-height: 1.12; }

h1 {
  max-width: 920px;
  margin: 0;
  font-size: clamp(2.4rem, 7vw, 5rem);
}

.lead {
  max-width: 790px;
  margin: 1.25rem 0 0;
  font-size: clamp(1.1rem, 2vw, 1.35rem);
  color: rgba(255,255,255,.84);
}

.content-section {
  padding: clamp(3rem, 6vw, 5.5rem) clamp(1.25rem, 6vw, 6rem);
}

.two-column {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(280px, .75fr);
  gap: clamp(2rem, 5vw, 4rem);
  align-items: start;
}

.content-section h2 {
  margin: 0 0 1rem;
  font-size: clamp(1.8rem, 4vw, 3rem);
}

.content-section p {
  max-width: 850px;
  color: var(--muted);
}

.callout-card {
  padding: 1.5rem;
  border: 1px solid var(--line);
  border-radius: 1rem;
  background: var(--ash);
  box-shadow: 0 16px 45px rgba(21,21,21,.08);
}

.callout-card h3 { margin-top: 0; }

.standards-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 1.5rem;
}

.standards-grid article {
  padding: 1.35rem;
  border: 1px solid var(--line);
  border-radius: 1rem;
  background: #fff;
}

.standards-grid h3 { margin-top: 0; }

.dark-band {
  background: var(--iron);
  color: #fff;
}

.dark-band p { color: rgba(255,255,255,.78); }

.check-list {
  padding-left: 1.2rem;
  color: var(--muted);
}

.button {
  display: inline-block;
  margin-top: 1rem;
  padding: .85rem 1.15rem;
  background: var(--iron);
  color: #fff;
  border-radius: .6rem;
  text-decoration: none;
  font-weight: 700;
}

.button:hover { background: var(--rust); }

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  padding: 1.4rem clamp(1.25rem, 6vw, 6rem);
  background: #0f0f0f;
  color: rgba(255,255,255,.72);
  font-size: .9rem;
}

.site-footer a { color: #f2c69d; text-decoration: none; }

@media (max-width: 840px) {
  .nav-toggle { display: block; }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: none;
    flex-direction: column;
    align-items: flex-start;
    padding: 1rem 1.25rem 1.25rem;
    background: #151515;
  }

  .site-nav.is-open { display: flex; }

  .two-column,
  .standards-grid { grid-template-columns: 1fr; }
}