/* =========================================================
   layout.css — Header, Navigation, Footer
   ========================================================= */

/* --- Header --- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: var(--space-6) 0;
  transition: background var(--transition), padding var(--transition), box-shadow var(--transition);
}

.site-header.scrolled {
  background: rgba(250, 250, 247, 0.96);
  backdrop-filter: blur(8px);
  padding: var(--space-4) 0;
  box-shadow: var(--shadow-sm);
}

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

/* Logo */
.site-logo {
  font-family: var(--f-serif);
  font-size: var(--text-xl);
  font-weight: 400;
  letter-spacing: 0.05em;
  color: var(--c-text);
  transition: color var(--transition);
}
.site-logo span { color: var(--c-accent); }

/* Nav */
.site-nav {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

.nav-link {
  font-family: var(--f-sans);
  font-size: var(--text-sm);
  font-weight: 400;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--c-text-muted);
  position: relative;
  transition: color var(--transition);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -3px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--c-accent);
  transition: width var(--transition);
}

.nav-link:hover,
.nav-link.active {
  color: var(--c-text);
}
.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

/* Mobile menu toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: var(--space-2);
}
.nav-toggle span {
  display: block;
  width: 22px;
  height: 1px;
  background: var(--c-text);
  transition: var(--transition);
}

/* Mobile nav overlay */
.nav-mobile {
  display: none;
  position: fixed;
  inset: 0;
  background: var(--c-bg);
  z-index: 99;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-8);
}

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

.nav-mobile .nav-link {
  font-family: var(--f-serif);
  font-size: var(--text-3xl);
  font-weight: 300;
  text-transform: none;
  letter-spacing: 0;
  color: var(--c-text);
}

.nav-mobile-close {
  position: absolute;
  top: var(--space-6);
  right: var(--space-6);
  font-size: var(--text-2xl);
  color: var(--c-text-muted);
  transition: color var(--transition);
}
.nav-mobile-close:hover { color: var(--c-text); }

/* --- Footer --- */
.site-footer {
  background: var(--c-text);
  color: var(--c-bg-soft);
  padding: var(--space-16) 0 var(--space-8);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: var(--space-12);
  padding-bottom: var(--space-12);
  border-bottom: 1px solid rgba(255,255,255,0.1);
  margin-bottom: var(--space-8);
}

.footer-brand .site-logo {
  color: var(--c-bg);
  margin-bottom: var(--space-4);
}

.footer-brand p {
  font-size: var(--text-sm);
  color: rgba(255,255,255,0.45);
  max-width: 260px;
  line-height: 1.7;
}

.footer-col h4 {
  font-family: var(--f-sans);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--c-accent);
  margin-bottom: var(--space-4);
}

.footer-col p,
.footer-col a {
  font-size: var(--text-sm);
  color: rgba(255,255,255,0.55);
  line-height: 2;
  transition: color var(--transition);
}
.footer-col a:hover { color: var(--c-bg); }

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: var(--text-xs);
  color: rgba(255,255,255,0.25);
}

/* --- Responsive --- */
@media (max-width: 768px) {
  .site-nav { display: none; }
  .nav-toggle { display: flex; }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: var(--space-8);
  }

  .footer-bottom {
    flex-direction: column;
    gap: var(--space-2);
    text-align: center;
  }
}