/* ==========================================================================
   layout.css
   Container, header, footer, section rhythm.
   ========================================================================== */

.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: 1.5rem;
}

/* ==========================================================================
   Site header + utility top bar
   ========================================================================== */

.top-bar {
  font-size: 0.875rem;
  letter-spacing: 0.01em;
}

.top-bar-link {
  transition: opacity var(--transition-base);
}

.top-bar-link:hover,
.top-bar-link:focus {
  opacity: 0.8;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  box-shadow: 0 1px 0 rgba(0, 0, 0, 0.06);
}

.site-logo-mark {
  letter-spacing: 0.02em;
}

/* Primary nav list */
.nav-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav-link {
  position: relative;
  display: inline-block;
  padding: 1.5rem 0;
  font-weight: 500;
  font-size: 0.95rem;
  letter-spacing: 0.01em;
  color: rgba(255, 255, 255, 0.95);
}

.nav-link::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 1rem;
  width: 0;
  height: 2px;
  background: #fff;
  transition: width var(--transition-base);
}

.nav-link:hover,
.nav-link:focus {
  color: #fff;
}

.nav-link:hover::after,
.nav-link:focus::after,
.nav-link[aria-current="page"]::after {
  width: 100%;
}

.nav-link--cta {
  padding: 0.6rem 1.25rem;
  margin-left: 0.5rem;
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.35);
  border-radius: var(--radius-md);
  transition: background var(--transition-base), border-color var(--transition-base);
}

.nav-link--cta::after { display: none; }

.nav-link--cta:hover,
.nav-link--cta:focus {
  background: rgba(255, 255, 255, 0.22);
  border-color: rgba(255, 255, 255, 0.6);
}

/* Mobile toggle */
.nav-toggle {
  background: transparent;
  border: 0;
  color: #fff;
  padding: 0.5rem;
  display: none;
}

@media (max-width: 767px) {
  .nav-toggle { display: inline-flex; }

  .nav-list {
    position: absolute;
    top: 100%;
    right: 1.5rem;
    left: 1.5rem;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: var(--color-brand-green-dark);
    border-radius: var(--radius-md);
    padding: 0.5rem;
    box-shadow: var(--shadow-lg);
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-slow);
  }

  .nav-list.nav-list--open {
    max-height: 500px;
  }

  .nav-link {
    padding: 0.75rem 1rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.12);
  }

  .nav-link::after { display: none; }

  .nav-item:last-child .nav-link { border-bottom: 0; }

  .nav-link--cta {
    margin: 0.5rem;
    text-align: center;
  }
}

/* ==========================================================================
   Section rhythm
   ========================================================================== */

.section {
  padding-block: 4rem;
}

@media (min-width: 768px) {
  .section { padding-block: 6rem; }
}

.section--tight  { padding-block: 3rem; }
.section--flush  { padding-block: 0; }

.section-header {
  text-align: center;
  max-width: 720px;
  margin-inline: auto;
  margin-bottom: 3rem;
}

.section-eyebrow {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-brand-green);
  margin-bottom: 0.75rem;
}

.section-title {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(1.875rem, 1.4rem + 2.2vw, 3rem);
  line-height: 1.15;
  letter-spacing: -0.015em;
  color: var(--color-brand-teal);
  margin-bottom: 1rem;
}

.section-title--on-dark { color: #fff; }

.section-subhead {
  font-size: 1.0625rem;
  color: var(--color-ink-soft);
  line-height: 1.65;
  max-width: 640px;
  margin-inline: auto;
}

.section-subhead--on-dark { color: rgba(255, 255, 255, 0.85); }

/* Alternating section backgrounds */
.section--sand  { background: var(--color-sand); }
.section--cream { background: var(--color-cream); }
.section--teal  { background: var(--color-brand-teal); color: #fff; }

/* ==========================================================================
   Footer
   ========================================================================== */

.footer-heading {
  font-family: var(--font-sans);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.75);
  margin-bottom: 1rem;
}

.footer-link-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.footer-link {
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.85);
  transition: color var(--transition-base);
}

.footer-link:hover,
.footer-link:focus {
  color: #fff;
  text-decoration: underline;
  text-underline-offset: 3px;
}