/* ========================================================================
   GEO SOLUTIONS — LAYOUT
   Header (sticky nav), Footer (multi-column), site-wide structural elements.
   Loaded after components.css.
   ======================================================================== */

/* ===== HEADER (STICKY) ===== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(10, 10, 11, 0.85);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--color-border-subtle);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  max-width: var(--container-default);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

@media (min-width: 768px) {
  .site-header__inner {
    padding: 0 var(--space-8);
  }
}

/* Logo */
.logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: var(--weight-medium);
  font-size: var(--text-body);
  letter-spacing: -0.01em;
  color: var(--color-text-primary);
}

.logo__mark {
  width: 22px;
  height: 22px;
  border-radius: var(--radius-sm);
  background: var(--color-accent);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--color-accent-text);
  font-family: var(--font-mono);
  font-weight: var(--weight-medium);
  font-size: 0.75rem;
}

/* Desktop nav */
.site-nav {
  display: none;
}

@media (min-width: 1024px) {
  .site-nav {
    display: flex;
    align-items: center;
    gap: var(--space-8);
  }
}

.site-nav a {
  font-size: var(--text-body-sm);
  color: var(--color-text-secondary);
  transition: color var(--duration-fast) var(--ease-default);
}

.site-nav a:hover,
.site-nav a:focus-visible {
  color: var(--color-text-primary);
}

/* Active nav state (current page) */
.site-nav a.is-active {
  color: var(--color-text-primary);
}

/* Mobile menu toggle (hamburger) */
.nav-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  color: var(--color-text-primary);
}

.nav-toggle:hover {
  background: var(--color-bg-elevated);
}

@media (min-width: 1024px) {
  .nav-toggle {
    display: none;
  }
}

.nav-toggle__icon {
  width: 20px;
  height: 14px;
  position: relative;
}

.nav-toggle__icon span {
  display: block;
  width: 100%;
  height: 2px;
  background: currentColor;
  position: absolute;
  left: 0;
  transition: all var(--duration-fast) var(--ease-default);
}

.nav-toggle__icon span:nth-child(1) {
  top: 0;
}

.nav-toggle__icon span:nth-child(2) {
  top: 6px;
}

.nav-toggle__icon span:nth-child(3) {
  top: 12px;
}

.nav-toggle.is-open .nav-toggle__icon span:nth-child(1) {
  transform: rotate(45deg);
  top: 6px;
}

.nav-toggle.is-open .nav-toggle__icon span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.is-open .nav-toggle__icon span:nth-child(3) {
  transform: rotate(-45deg);
  top: 6px;
}

/* Mobile menu overlay */
.mobile-nav {
  position: fixed;
  top: 64px;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--color-bg-base);
  z-index: 49;
  padding: var(--space-8) var(--space-6);
  display: none;
  flex-direction: column;
  gap: var(--space-2);
  overflow-y: auto;
}

.mobile-nav.is-open {
  display: flex;
}

@media (min-width: 1024px) {
  .mobile-nav.is-open {
    display: none;
  }
}

.mobile-nav a {
  font-size: var(--text-h4);
  color: var(--color-text-primary);
  padding: var(--space-3) 0;
  border-bottom: 1px solid var(--color-border-subtle);
}

.mobile-nav .btn {
  margin-top: var(--space-6);
  align-self: stretch;
  justify-content: center;
}

/* Header CTA hide on smallest screens (use hamburger nav for that) */
.site-header .btn {
  display: none;
}

@media (min-width: 480px) {
  .site-header .btn {
    display: inline-flex;
  }
}

/* ===== FOOTER ===== */

.footer {
  border-top: 1px solid var(--color-border-subtle);
  padding: var(--space-16) 0 var(--space-12);
  margin-top: var(--space-32);
}

.footer__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-12);
  margin-bottom: var(--space-16);
}

@media (min-width: 768px) {
  .footer__grid {
    grid-template-columns: 1.4fr 2.6fr 1fr 1fr;
    gap: var(--space-8);
  }
}

.footer__brand p {
  font-size: var(--text-caption);
  color: var(--color-text-tertiary);
  line-height: var(--leading-relaxed);
  max-width: 36ch;
  margin-top: var(--space-3);
}

.footer__col-title {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: var(--tracking-wide);
  color: var(--color-text-tertiary);
  text-transform: uppercase;
  margin-bottom: var(--space-4);
}

.footer__list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.footer__list a {
  font-size: var(--text-body-sm);
  color: var(--color-text-secondary);
  transition: color var(--duration-fast) var(--ease-default);
}

.footer__list a:hover,
.footer__list a:focus-visible {
  color: var(--color-text-primary);
}

/* Services column with 4 sub-groups */
.footer__services {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
}

@media (min-width: 600px) {
  .footer__services {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-6) var(--space-8);
  }
}

@media (min-width: 1024px) {
  .footer__services {
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-6);
  }
}

.footer__services-group .footer__col-title {
  margin-bottom: var(--space-3);
  color: var(--color-text-secondary);
}

.footer__services-group .footer__list {
  gap: 10px;
}

.footer__services-group .footer__list a {
  font-size: var(--text-caption);
}

/* Highlighted CTA link in footer (Discovery Audit) */
.footer__cta-link {
  display: inline-flex !important;
  align-items: center;
  gap: 6px;
  color: var(--color-accent) !important;
  font-weight: var(--weight-medium);
}

.footer__cta-link::after {
  content: "↗";
  font-size: 0.875em;
}

/* Footer bottom strip */
.footer__bottom {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-3);
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-border-subtle);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: var(--tracking-normal);
  color: var(--color-text-tertiary);
  text-transform: uppercase;
}

.footer__bottom a {
  color: inherit;
  transition: color var(--duration-fast) var(--ease-default);
}

.footer__bottom a:hover {
  color: var(--color-text-primary);
}