/* ==========================================================================
   Layout — Header, Footer, Container, Grid
   ========================================================================== */

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

/* --- Section Spacing --- */
.section {
  padding-block: clamp(4rem, 8vw, 6rem);
}

/* --- Two-Column Grid --- */
.grid-2 {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-12);
}

@media (min-width: 768px) {
  .grid-2 {
    grid-template-columns: 1fr 1fr;
    align-items: center;
  }

  .grid-2--40-60 {
    grid-template-columns: 2fr 3fr;
  }

  .grid-2--60-40 {
    grid-template-columns: 3fr 2fr;
  }
}

/* --- Three-Column Grid --- */
.grid-3 {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
}

@media (min-width: 768px) {
  .grid-3 {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* --- Header --- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background-color: var(--color-bg-primary);
  border-bottom: 1px solid var(--color-border);
  transition: background-color var(--transition-base),
              backdrop-filter var(--transition-base);
}

.site-header.is-scrolled {
  background-color: rgba(15, 14, 13, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.header-logo {
  text-decoration: none;
  flex-shrink: 0;
}

.header-logo svg {
  height: 40px;
  width: auto;
  display: block;
}

.header-logo:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

/* --- Desktop Nav --- */
.nav-links {
  display: none;
  gap: var(--space-2);
}

@media (min-width: 768px) {
  .nav-links {
    display: flex;
    align-items: center;
  }
}

.nav-links a {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  text-decoration: none;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-pill);
  transition: color var(--transition-fast);
}

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

.nav-links a.is-active {
  color: var(--color-text-primary);
  outline: 1px solid var(--color-border-strong);
  outline-offset: 0;
}

.nav-links a:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
}

/* --- Header CTA --- */
.header-cta {
  display: none;
}

@media (min-width: 768px) {
  .header-cta {
    display: inline-flex;
  }
}

/* --- Burger Button --- */
.burger-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  color: var(--color-text-primary);
}

@media (min-width: 768px) {
  .burger-btn {
    display: none;
  }
}

/* --- Mobile Menu Overlay --- */
.mobile-menu {
  position: fixed;
  inset: 0;
  z-index: 999;
  background-color: var(--color-bg-primary);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-8);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-base), visibility var(--transition-base);
}

.mobile-menu.is-open {
  opacity: 1;
  visibility: visible;
}

.mobile-menu a {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  color: var(--color-text-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

.mobile-menu-close {
  position: absolute;
  top: var(--space-6);
  right: var(--space-6);
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-primary);
}

/* --- Main Content (offset for fixed header) --- */
main {
  padding-top: 72px;
}

/* --- Footer --- */
.site-footer {
  background-color: var(--color-bg-subtle);
  border-top: 1px solid var(--color-border);
  padding-block: var(--space-16) var(--space-8);
}

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

@media (min-width: 768px) {
  .footer-grid {
    grid-template-columns: 2fr 1fr 1fr 1fr;
  }
}

.footer-brand p {
  margin-top: var(--space-4);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  max-width: 30ch;
}

.footer-nav-title {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-label);
  margin-bottom: var(--space-4);
}

.footer-nav-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.footer-nav-list a {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer-nav-list a:hover {
  color: var(--color-accent);
}

.footer-bottom {
  border-top: 1px solid var(--color-border);
  padding-top: var(--space-8);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

@media (min-width: 768px) {
  .footer-bottom {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
  }
}

.footer-legal-links {
  display: flex;
  gap: var(--space-6);
}

.footer-legal-links a {
  color: var(--color-text-muted);
  text-decoration: none;
  font-size: var(--text-sm);
}

.footer-legal-links a:hover {
  color: var(--color-accent);
}