/* ============================================================
   Layout: container, grid/flex utilities, header, footer
   Consumes tokens from variables.css.
   ============================================================ */

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

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

/* ---- Section rhythm ---- */
.section {
  padding-block: var(--space-7);
}

.section--tight {
  padding-block: var(--space-5);
}

.padding-block {
  padding-block: var(--space-7);
}

.text-center {
  text-align: center;
}

.section-title {
  font-family: var(--font-heading);
  font-size: var(--fs-700);
  font-weight: 700;
  line-height: var(--lh-tight);
  color: var(--color-heading);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: var(--space-4);
}

/* ---- Flex / Grid utilities ---- */
.flex {
  display: flex;
  gap: var(--space-2);
}

.flex-center {
  display: flex;
  align-items: center;
  justify-content: center;
}

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

.grid {
  display: grid;
  gap: var(--space-4);
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

/* Auto-fit responsive card grid */
.grid-auto {
  display: grid;
  gap: var(--space-4);
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

/* ============================================================
   Header - fixed, transparent by default, solid when .scrolled
   ============================================================ */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: var(--z-header);
  padding-top: var(--space-4);
  background-color: transparent;
  transition: background-color var(--transition), box-shadow var(--transition);
}

.site-header .site-header__inner {
  max-width: none;
  width: 100%;
  padding-inline: var(--header-gutter);
}

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

.site-header__brand {
  display: inline-flex;
  flex-shrink: 0;
  align-items: center;
  margin-right: auto;
}

.site-header__logo {
  display: block;
  height: var(--header-logo-height);
  width: auto;
  border-radius: var(--radius-sm);
}

.main-nav {
  flex-shrink: 0;
}

/* Scrolled state (toggled by JS in Phase 4) */
.site-header.scrolled {
  background-color: var(--color-primary);
  box-shadow: var(--shadow-md);
}

/* ---- Desktop navigation ---- */
.main-nav__list {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.main-nav__link {
  color: var(--color-on-primary);
  font-weight: 500;
  font-size: var(--fs-400);
  padding-block: var(--space-1);
}

/* ---- Mobile hamburger toggle (hidden on desktop) ---- */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: var(--space-1);
}

.nav-toggle__bar {
  display: block;
  width: 26px;
  height: 2px;
  background-color: var(--color-on-primary);
  border-radius: var(--radius-pill);
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

/* ============================================================
   Footer
   ============================================================ */
.site-footer {
  background-color: var(--color-primary);
  color: var(--color-on-primary);
}

.site-footer__grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: var(--space-5);
  padding-block: var(--space-6);
}

.site-footer__logo {
  height: 52px;
  width: auto;
  border-radius: var(--radius-sm);
  margin-bottom: var(--space-2);
}

.site-footer__about {
  color: rgba(255, 255, 255, 0.75);
  font-size: var(--fs-300);
  line-height: var(--lh-base);
  text-align: justify;
  -webkit-hyphens: auto;
  hyphens: auto;
}

.site-footer__heading {
  color: var(--color-on-primary);
  font-size: var(--fs-500);
  margin-bottom: var(--space-3);
}

.site-footer__links,
.site-footer__contact {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.site-footer__links a,
.site-footer__contact a {
  color: rgba(255, 255, 255, 0.8);
  font-size: var(--fs-400);
}

.site-footer__links a:hover,
.site-footer__contact a:hover {
  color: var(--color-secondary);
}

.site-footer__bar {
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  padding-block: var(--space-3);
}

.site-footer__bar p {
  margin: 0;
  text-align: center;
  color: rgba(255, 255, 255, 0.65);
  font-size: var(--fs-300);
  max-width: none;
}

/* ============================================================
   Responsive: collapse nav + footer below 768px
   ============================================================ */
@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }

  .site-header {
    padding-top: var(--space-2);
  }

  .site-header__inner {
    min-height: var(--header-height-mobile);
  }

  .site-header__logo {
    height: var(--header-logo-height-mobile);
  }

  /* Off-canvas mobile menu; JS adds .is-open in Phase 4 */
  .main-nav {
    position: fixed;
    inset: 0 0 0 auto;
    width: min(78vw, 320px);
    background-color: var(--color-primary);
    box-shadow: var(--shadow-lg);
    transform: translateX(100%);
    transition: transform var(--transition);
    padding: calc(var(--header-height-mobile) + var(--space-2) + var(--space-4)) var(--space-4) var(--space-4);
    z-index: var(--z-overlay);
  }

  .main-nav.is-open {
    transform: translateX(0);
  }

  .main-nav__list {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-3);
  }

  .site-footer__grid {
    grid-template-columns: 1fr;
    gap: var(--space-4);
    text-align: left;
  }
}

@media (max-width: 480px) {
  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }
}