/* ==========================================================================
   Carbotrack — layout.css
   Header, navigation, footer, section shells, containers
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. CONTAINER
   -------------------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: 1rem;
}

@media (min-width: 640px)  { .container { padding-inline: 1.5rem; } }
@media (min-width: 1024px) { .container { padding-inline: 2rem; } }

/* --------------------------------------------------------------------------
   2. SITE HEADER
   -------------------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, .92);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--forest-100);
  transition: box-shadow var(--dur) var(--ease), background var(--dur) var(--ease);
}

.site-header.is-scrolled {
  box-shadow: var(--sh-md);
  background: rgba(255, 255, 255, .97);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-h);
  gap: 1rem;
}

/* ---- Brand -------------------------------------------------------------- */
.brand {
  display: flex;
  align-items: center;
  gap: .75rem;
  flex-shrink: 0;
}

.brand__mark {
  width: 2.75rem;
  height: 2.75rem;
  border-radius: var(--r-md);
  background: var(--forest-900);
  color: var(--leaf-400);
  display: grid;
  place-items: center;
  font-size: 1.15rem;
  box-shadow: var(--sh-md);
  transition: transform var(--dur) var(--ease);
}

.brand:hover .brand__mark { transform: scale(1.06); }

.brand__name {
  display: flex;
  align-items: center;
  gap: .35rem;
  font-family: 'Poppins', sans-serif;
  font-weight: 700;
  font-size: 1.4rem;
  letter-spacing: -.02em;
  color: var(--forest-900);
  line-height: 1.1;
}

.brand__name::after {
  content: "";
  width: .5rem;
  height: .5rem;
  border-radius: 50%;
  background: var(--leaf-500);
}

.brand__tag {
  display: block;
  font-size: .65rem;
  font-weight: 600;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--forest-600);
}

/* ---- Desktop navigation ------------------------------------------------- */
.main-nav {
  display: none;
  align-items: center;
  gap: 1.4rem;
  font-size: .8rem;
  font-weight: 500;
  color: #334155;
}

@media (min-width: 1200px) { .main-nav { display: flex; } }

.main-nav a {
  position: relative;
  padding: .3rem 0;
  transition: color var(--dur) var(--ease);
  white-space: nowrap;
}

.main-nav a:hover { color: var(--leaf-600); }

.main-nav a.is-active {
  color: var(--forest-900);
  font-weight: 700;
}

.main-nav a.is-active::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -3px;
  height: 2px;
  border-radius: 2px;
  background: var(--leaf-500);
}

/* ---- Header actions ----------------------------------------------------- */
.header-actions {
  display: none;
  align-items: center;
  gap: .65rem;
  flex-shrink: 0;
}

@media (min-width: 640px) { .header-actions { display: flex; } }

/* ---- Mobile toggle ------------------------------------------------------ */
.mobile-toggle {
  display: grid;
  place-items: center;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: var(--r-md);
  color: #334155;
  transition: background var(--dur) var(--ease);
}

.mobile-toggle:hover { background: var(--forest-50); }

@media (min-width: 1200px) { .mobile-toggle { display: none; } }

/* ---- Mobile dropdown ---------------------------------------------------- */
.mobile-menu {
  display: none;
  background: #fff;
  border-bottom: 1px solid var(--forest-100);
  padding: .75rem 1rem 1.5rem;
}

.mobile-menu:not(.hidden) { display: block; }

@media (min-width: 1200px) { .mobile-menu { display: none !important; } }

.mobile-menu a {
  display: block;
  padding: .65rem .25rem;
  font-size: 1rem;
  font-weight: 500;
  color: #334155;
  border-bottom: 1px solid #f1f5f3;
  transition: color var(--dur) var(--ease);
}

.mobile-menu a:hover { color: var(--leaf-600); }

.mobile-menu__actions {
  display: flex;
  flex-direction: column;
  gap: .5rem;
  padding-top: 1rem;
}

/* --------------------------------------------------------------------------
   3. SECTIONS
   -------------------------------------------------------------------------- */
.section          { padding-block: 5rem; }
.section--tight   { padding-block: 4rem; }
.section--alt     { background: var(--forest-50); }
.section--white   { background: #fff; }
.section--earth   { background: var(--earth); }
.section--border  { border-bottom: 1px solid var(--forest-100); }

.section-head {
  max-width: 48rem;
  margin-inline: auto;
  text-align: center;
  margin-bottom: 3.5rem;
}

/* --------------------------------------------------------------------------
   4. SITE FOOTER
   -------------------------------------------------------------------------- */
.site-footer {
  background: var(--forest-950);
  color: #94a3b8;
  padding-block: 4rem 2rem;
  font-size: .82rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  padding-bottom: 3rem;
  border-bottom: 1px solid rgba(40, 70, 58, .6);
}

@media (min-width: 768px) { .footer-grid { grid-template-columns: repeat(4, 1fr); } }

.footer-brand {
  display: flex;
  align-items: center;
  gap: .55rem;
  color: #fff;
  font-family: 'Poppins', sans-serif;
  font-weight: 700;
  font-size: 1.2rem;
  margin-bottom: 1rem;
}

.footer-brand__mark {
  width: 2.25rem;
  height: 2.25rem;
  border-radius: var(--r-sm);
  background: var(--leaf-600);
  color: var(--forest-950);
  display: grid;
  place-items: center;
}

.footer-title {
  color: #fff;
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
  margin-bottom: 1rem;
}

.footer-links li { margin-bottom: .55rem; }

.footer-links a { transition: color var(--dur) var(--ease); }
.footer-links a:hover { color: var(--leaf-400); }

.footer-social { display: flex; gap: .65rem; margin-top: .75rem; }

.footer-social a {
  width: 2.25rem;
  height: 2.25rem;
  border-radius: var(--r-sm);
  background: var(--forest-900);
  display: grid;
  place-items: center;
  font-size: 1rem;
  color: #cbd5e1;
  transition: all var(--dur) var(--ease);
}

.footer-social a:hover {
  background: var(--leaf-600);
  color: #fff;
  transform: translateY(-2px);
}

.footer-bottom {
  padding-top: 2rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  align-items: center;
  justify-content: space-between;
  font-size: .75rem;
  color: #64748b;
}

@media (min-width: 640px) { .footer-bottom { flex-direction: row; } }