.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--space-5);
}

.container--narrow {
  max-width: var(--container-narrow);
}

.section {
  padding-block: var(--space-12);
}

@media (min-width: 48rem) {
  .section { padding-block: var(--space-16); }
}

.section--tight { padding-block: var(--space-8); }
.section--loose { padding-block: var(--space-24); }

.section--band { background-color: var(--color-bg-band); }

.section--ink {
  background-color: var(--color-ink);
  color: #fff;
}

.section--ink h1,
.section--ink h2,
.section--ink h3,
.section--ink h4 { color: #fff; }

.section--ink a { color: #cfe0ff; }
.section--ink a:hover { color: #fff; }

.section__header {
  max-width: 44rem;
  margin-bottom: var(--space-8);
}

.section__eyebrow {
  display: inline-block;
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-blue-700);
  margin-bottom: var(--space-3);
  font-weight: 600;
}

.section--ink .section__eyebrow { color: #9ec2ff; }

hr.divider {
  border: 0;
  border-top: 1px solid var(--color-border);
  margin: var(--space-12) 0;
}

/* Site header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(255, 255, 255, 0.9);
  border-bottom: 1px solid var(--color-border);
  backdrop-filter: saturate(140%) blur(8px);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  min-height: 4rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  color: var(--color-ink);
  font-weight: 700;
}

.brand:hover { color: var(--color-ink); }

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  border-radius: var(--radius-sm);
  background: var(--color-blue-900);
  color: #fff;
  font-size: var(--text-sm);
  font-weight: 700;
}

.brand-name { font-size: var(--text-md); }

/* Mobile nav using <details> so content works without JS */
.nav-details { position: relative; }
.nav-toggle {
  list-style: none;
  cursor: pointer;
  display: inline-flex;
  flex-direction: column;
  gap: 4px;
  padding: var(--space-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: #fff;
}

.nav-toggle::-webkit-details-marker { display: none; }
.nav-toggle::marker { content: ""; }

.nav-toggle__bar {
  display: block;
  width: 1.125rem;
  height: 2px;
  background: var(--color-ink);
  border-radius: 1px;
}

.primary-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.primary-nav a {
  display: block;
  padding: var(--space-2) var(--space-3);
  color: var(--color-ink);
  text-decoration: none;
  border-radius: var(--radius-sm);
}

.primary-nav a:hover { background: var(--color-bg-soft); color: var(--color-blue-700); }

.primary-nav a[aria-current="page"] {
  background: var(--color-blue-100);
  color: var(--color-blue-900);
  font-weight: 600;
}

/* Desktop nav revealed */
@media (min-width: 50rem) {
  .nav-toggle { display: none; }
  .nav-details[open] .primary-nav { /* keep */ }
  .primary-nav {
    position: static;
    display: block;
  }
  .primary-nav ul {
    flex-direction: row;
    gap: var(--space-2);
  }
  /* when details closed on desktop, still show nav */
  .nav-details:not([open]) .primary-nav { display: block; }
}

/* On mobile, primary nav only visible when details open */
@media (max-width: 49.99rem) {
  .primary-nav {
    display: none;
    position: absolute;
    right: 0;
    top: calc(100% + var(--space-2));
    min-width: 12rem;
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-2);
    box-shadow: 0 8px 24px rgba(10, 13, 18, 0.08);
  }
  .nav-details[open] .primary-nav { display: block; }
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding-block: var(--space-12);
  background: var(--color-bg-soft);
}

.footer-inner {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.footer-nav {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2) var(--space-5);
}

.footer-nav a {
  color: var(--color-ink);
  text-decoration: none;
}

.footer-nav a:hover { color: var(--color-blue-700); }

.footer-meta {
  color: var(--color-muted);
  font-size: var(--text-sm);
}

/* Generic utilities */
.stack > * + * { margin-top: var(--space-4); }
.cluster { display: flex; flex-wrap: wrap; gap: var(--space-3); }
.grid-2 { display: grid; gap: var(--space-8); }
.grid-3 { display: grid; gap: var(--space-8); }
@media (min-width: 48rem) {
  .grid-2 { grid-template-columns: 1fr 1fr; }
  .grid-3 { grid-template-columns: repeat(3, 1fr); }
}

.surface {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-6);
  background: #fff;
}

.kv-list { list-style: none; margin: 0; padding: 0; }
.kv-list li {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-1);
  padding-block: var(--space-4);
  border-top: 1px solid var(--color-border);
}
.kv-list li:first-child { border-top: 0; }
.kv-list strong { color: var(--color-blue-900); }

@media (min-width: 40rem) {
  .kv-list li { grid-template-columns: 12rem 1fr; gap: var(--space-6); }
}