/* ==========================================================================
   03. Layout
   --------------------------------------------------------------------------
   Structure shared by every page: containers, header, navigation, mobile
   menu, footer. No decoration here — only position, size and order.
   ========================================================================== */

/* -- Containers --------------------------------------------------------------- */

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

@media (min-width: 48rem) {
  .container {
    padding-inline: var(--space-6);
  }
}

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

main {
  min-height: 60vh;
}

/* Section rhythm: generous, equal, calm. */
.section {
  padding-block: clamp(3rem, 7vw, 5rem);
}

.section + .section {
  border-top: 1px solid var(--color-border);
}

/* -- Header --------------------------------------------------------------------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  transition:
    background-color var(--dur-base) var(--ease-out),
    box-shadow var(--dur-base) var(--ease-out);
}

/* Elevation cue once scrolled: lifts the nav off the content beneath it. */
.site-header.is-scrolled {
  background-color: color-mix(in srgb, var(--color-bg) 88%, transparent);
  box-shadow: var(--shadow-sm);
}

@media (min-width: 60rem) {
  .site-header.is-scrolled {
    /* Soft glass blur on larger viewports only (cheap, none on phones). */
    -webkit-backdrop-filter: blur(12px);
    backdrop-filter: blur(12px);
  }
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  height: var(--header-h);
}

.site-nav {
  display: none;
}

@media (min-width: 60rem) {
  .site-nav {
    display: block;
  }
}

.site-nav ul {
  display: flex;
  gap: var(--space-5);
  list-style: none;
  padding: 0;
}

.nav-link {
  display: inline-block;
  padding-block: var(--space-2);
  color: var(--color-text-muted);
  font-weight: 500;
  position: relative;
}

.nav-link:hover {
  color: var(--color-text);
  text-decoration: none;
}

.nav-link[aria-current="page"] {
  color: var(--color-text);
}

.nav-link[aria-current="page"]::after {
  content: "";
  position: absolute;
  inset-inline: 0;
  bottom: 0;
  height: 2px;
  border-radius: var(--radius-full);
  background-color: var(--color-accent);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--color-text);
  font-weight: 700;
}

.logo:hover {
  text-decoration: none;
}

.logo__mark {
  width: 2rem;
  height: 2rem;
  display: grid;
  place-items: center;
  border-radius: var(--radius-md);
  background-color: var(--color-accent);
  color: var(--color-on-accent);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.05em;
}

.logo__name {
  font-size: var(--text-lg);
}

@media (max-width: 30rem) {
  .logo__name {
    display: none;
  }
}

/* -- Mobile menu ---------------------------------------------------------------- */

.mobile-menu {
  position: fixed;
  inset: 0;
  z-index: 80;
  display: flex;
  flex-direction: column;
  background-color: var(--color-bg);
  padding: var(--space-4) var(--space-5) var(--space-6);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-0.5rem);
  transition:
    opacity var(--dur-base) var(--ease-out),
    transform var(--dur-base) var(--ease-out),
    visibility 0s linear var(--dur-base);
}

.mobile-menu.is-open {
  opacity: 1;
  visibility: visible;
  transform: none;
  transition-delay: 0s;
}

@media (min-width: 60rem) {
  .mobile-menu {
    display: none;
  }
}

.mobile-menu__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-6);
}

.mobile-menu__title {
  font-weight: 700;
  font-size: var(--text-lg);
}

.mobile-menu__nav ul {
  list-style: none;
  padding: 0;
  display: grid;
  gap: var(--space-1);
}

.mobile-menu__nav a {
  display: block;
  padding: var(--space-3) var(--space-2);
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--color-text);
  border-radius: var(--radius-md);
}

.mobile-menu__nav a:hover {
  text-decoration: none;
  background-color: var(--color-surface-2);
}

.mobile-menu__nav a[aria-current="page"] {
  color: var(--color-accent);
}

body.nav-open {
  overflow: hidden;
}

/* -- Footer ----------------------------------------------------------------------- */

.site-footer {
  border-top: 1px solid var(--color-border);
  padding-block: var(--space-7) var(--space-5);
  margin-top: var(--space-8);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
  padding-bottom: var(--space-6);
}

@media (min-width: 48rem) {
  .footer-grid {
    grid-template-columns: 2fr 1fr 1fr;
  }
}

.footer-brand__tagline {
  margin-top: var(--space-3);
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}

.footer-title {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text-faint);
  margin-bottom: var(--space-3);
}

.footer-links ul,
.footer-contact__list {
  list-style: none;
  padding: 0;
  display: grid;
  gap: var(--space-2);
}

.footer-links a,
.footer-contact__list a {
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}

.footer-links a:hover,
.footer-contact__list a:hover {
  color: var(--color-text);
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2) var(--space-4);
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--color-border);
  padding-top: var(--space-4);
  color: var(--color-text-faint);
  font-size: var(--text-sm);
}

.footer-bottom__built {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
}

/* Mobile: footer links read easier and offer a friendlier tap target. */
@media (max-width: 48rem) {
  .footer-links ul,
  .footer-contact__list {
    gap: var(--space-3);
  }

  .footer-links a,
  .footer-contact__list a {
    font-size: var(--text-base);
  }
}