/*
  Structural layout: container, site header/nav, footer, section rhythm.
*/

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

section {
  padding-block: var(--space-9);
}

.section-head {
  margin-bottom: var(--space-7);
  max-width: 640px;
}

.section-head .eyebrow {
  display: block;
  margin-bottom: var(--space-3);
}

.section-head p {
  margin-top: var(--space-3);
  font-size: var(--fs-body-lg);
}

.section-foot {
  margin-top: var(--space-6);
}

/* ---------- Site header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  background: rgba(250, 250, 250, 0.85);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--color-border);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--fs-body-lg);
  color: var(--color-primary);
}

.main-nav {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

.main-nav__list {
  display: flex;
  align-items: center;
  gap: var(--space-5);
}

.main-nav__link {
  font-size: var(--fs-small);
  font-weight: 500;
  color: var(--color-secondary);
  padding-block: var(--space-2);
  position: relative;
  transition: color var(--duration-fast) var(--ease-standard);
}

.main-nav__link:hover {
  color: var(--color-primary);
}

.main-nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -2px;
  height: 2px;
  background: var(--color-accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--duration-base) var(--ease-standard);
}

.main-nav__link:hover::after {
  transform: scaleX(1);
}

.main-nav__link[aria-current="page"] {
  color: var(--color-primary);
}

.main-nav__link[aria-current="page"]::after {
  transform: scaleX(1);
}

.nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
}

.nav-toggle svg {
  width: 22px;
  height: 22px;
}

/* ---------- Site footer (deliberately dark — the one grounded, weighted
   moment on an otherwise light page, echoing how Apple/Stripe close a page) ---------- */
.site-footer {
  position: relative;
  background: var(--color-dark-surface);
  padding-block: var(--space-8) var(--space-6);
}

/* soft light seam where the light page meets the dark footer */
.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.16), transparent);
}

.site-footer .container {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-6);
}

.footer-brand {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--fs-h3);
  color: var(--color-dark-text);
}

.footer-tagline {
  margin-top: var(--space-2);
  font-size: var(--fs-small);
  color: var(--color-dark-text-muted);
  max-width: 320px;
}

.footer-copy {
  margin-top: var(--space-6);
  font-size: var(--fs-small);
  color: var(--color-dark-text-muted);
}

.footer-socials {
  display: flex;
  gap: var(--space-4);
}

.footer-socials a {
  color: var(--color-dark-text-muted);
  transition: color var(--duration-fast) var(--ease-standard);
}

.footer-socials a:hover {
  color: var(--color-dark-accent);
}

.footer-socials svg {
  width: 18px;
  height: 18px;
}

/* ---------- Generic grids ---------- */
.grid {
  display: grid;
  gap: var(--space-6);
}

.grid-2 {
  grid-template-columns: repeat(2, 1fr);
}

.grid-3 {
  grid-template-columns: repeat(3, 1fr);
}

.grid-4 {
  grid-template-columns: repeat(4, 1fr);
}