/* ============================================================
   CYTECH SOLUTIONS — NAVIGATION
   ============================================================ */

/* ── HEADER ── */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  background: rgba(247,248,250,0.97);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid #DDE1E6;
  transition: background var(--transition-base), box-shadow var(--transition-base);
}
.site-header.scrolled {
  background: rgba(247,248,250,0.99);
  box-shadow: 0 2px 16px rgba(13,31,60,0.10);
}

/* Dark mode header */
[data-theme="dark"] .site-header {
  background: rgba(13,31,60,0.96);
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
[data-theme="dark"] .site-header.scrolled {
  background: rgba(13,31,60,0.99);
  box-shadow: 0 2px 20px rgba(0,0,0,0.3);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 80px;
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

/* ── LOGO ── */
.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  flex-shrink: 0;
}
.nav-logo svg { height: 36px; width: auto; }

/* SVG logo sizing — vertical layout (icon stacked above wordmark) */
.nav-logo-img {
  height: 64px;
  width: auto;
  object-fit: contain;
  display: block;
}

/* Footer logo — reversed SVG (white on navy) */
.footer-logo-img {
  height: 72px;
  width: auto;
  object-fit: contain;
  display: block;
}

/* Legacy text logo classes (kept for fallback) */
.nav-logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1;
}
.nav-logo-wordmark {
  font-family: 'DM Sans', sans-serif;
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--color-navy);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}
.nav-logo-sub {
  font-family: 'DM Sans', sans-serif;
  font-size: 0.6rem;
  font-weight: 500;
  color: var(--color-teal);
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

/* ── PRIMARY NAV ── */
.nav-menu {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}
.nav-link {
  font-family: 'DM Sans', sans-serif;
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-navy);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast), background var(--transition-fast);
  white-space: nowrap;
  position: relative;
}
.nav-link:hover {
  color: var(--color-teal);
  background: rgba(10,124,140,0.07);
}
.nav-link.active {
  color: var(--color-teal);
}

/* Dark mode nav links */
[data-theme="dark"] .nav-link {
  color: rgba(255,255,255,0.8);
}
[data-theme="dark"] .nav-link:hover {
  color: #ffffff;
  background: rgba(255,255,255,0.07);
}
[data-theme="dark"] .nav-link.active {
  color: var(--color-teal-light);
}

/* ── DROPDOWN ── */
.nav-item { position: relative; }
.nav-item:hover .nav-dropdown { opacity: 1; visibility: visible; transform: translateY(0); }

.nav-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  min-width: 240px;
  background: var(--color-navy);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius-md);
  padding: var(--space-2);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: all var(--transition-base);
  box-shadow: var(--shadow-lg);
  z-index: 100;
}
.nav-dropdown a {
  display: block;
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-sm);
  color: rgba(255,255,255,0.75);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}
.nav-dropdown a:hover {
  background: rgba(10,124,140,0.2);
  color: #ffffff;
  padding-left: calc(var(--space-4) + 4px);
}

/* ── NAV ACTIONS ── */
.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

/* ── THEME TOGGLE ── */
.theme-toggle {
  width: 36px; height: 36px;
  border-radius: 50%;
  border: 1.5px solid rgba(13,31,60,0.2);
  background: transparent;
  color: var(--color-navy);
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: all var(--transition-fast);
}
.theme-toggle:hover { border-color: var(--color-teal); color: var(--color-teal); }
.theme-toggle svg { width: 16px; height: 16px; }

/* Dark mode theme toggle */
[data-theme="dark"] .theme-toggle {
  border: 1.5px solid rgba(255,255,255,0.2);
  color: rgba(255,255,255,0.7);
}
[data-theme="dark"] .theme-toggle:hover { border-color: rgba(255,255,255,0.5); color: #fff; }

/* ── MOBILE HAMBURGER ── */
.nav-hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px; height: 36px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0;
  margin-left: var(--space-2);
}
.nav-hamburger span {
  display: block;
  height: 2px;
  background: var(--color-navy);
  border-radius: 2px;
  transition: all 0.3s ease;
}

/* Dark mode hamburger */
[data-theme="dark"] .nav-hamburger span {
  background: rgba(255,255,255,0.8);
}
.nav-hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-hamburger.open span:nth-child(2) { opacity: 0; }
.nav-hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ── MOBILE NAV ── */
.nav-mobile {
  display: none;
  flex-direction: column;
  background: #F7F8FA;
  border-top: 1px solid #DDE1E6;
  padding: var(--space-4) var(--gutter) var(--space-6);
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease;
}
.nav-mobile.open {
  display: flex;
  max-height: 600px;
}
.nav-mobile a {
  font-family: 'DM Sans', sans-serif;
  font-size: var(--text-base);
  color: var(--color-navy);
  padding: var(--space-3) 0;
  border-bottom: 1px solid rgba(13,31,60,0.08);
  transition: color var(--transition-fast);
}
.nav-mobile a:hover { color: var(--color-teal); }
.nav-mobile a:last-child { border-bottom: none; }

/* Dark mode mobile nav */
[data-theme="dark"] .nav-mobile {
  background: var(--color-navy);
  border-top: 1px solid rgba(255,255,255,0.08);
}
[data-theme="dark"] .nav-mobile a {
  color: rgba(255,255,255,0.8);
  border-bottom: 1px solid rgba(255,255,255,0.07);
}
[data-theme="dark"] .nav-mobile a:hover { color: var(--color-teal-light); }
.nav-mobile .mobile-cta {
  margin-top: var(--space-4);
  text-align: center;
}

@media (max-width: 1024px) {
  .nav-menu { display: none; }
  .nav-hamburger { display: flex; }
}
@media (max-width: 480px) {
  .nav-logo-sub { display: none; }
}

/* ── FOOTER ── */
.site-footer {
  background: var(--color-navy);
  color: rgba(255,255,255,0.75);
  padding-top: clamp(var(--space-12), 6vw, var(--space-20));
  padding-bottom: var(--space-8);
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-10);
  padding-bottom: var(--space-10);
  border-bottom: 1px solid rgba(255,255,255,0.1);
}
@media (max-width: 900px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 600px) {
  .footer-grid { grid-template-columns: 1fr; }
}

.footer-logo {
  display: flex; align-items: center; gap: var(--space-3);
  margin-bottom: var(--space-4);
}
.footer-tagline {
  font-size: var(--text-sm);
  color: var(--color-teal-light);
  font-style: italic;
  margin-bottom: var(--space-4);
  font-family: 'DM Sans', sans-serif;
  font-weight: 500;
}
.footer-desc {
  font-size: var(--text-sm);
  color: rgba(255,255,255,0.55);
  line-height: 1.7;
  margin-bottom: var(--space-5);
  max-width: 36ch;
}
.footer-col-title {
  font-family: 'DM Sans', sans-serif;
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.4);
  margin-bottom: var(--space-4);
}
.footer-links { display: flex; flex-direction: column; gap: var(--space-3); }
.footer-links a {
  font-size: var(--text-sm);
  color: rgba(255,255,255,0.65);
  transition: color var(--transition-fast);
}
.footer-links a:hover { color: var(--color-teal-light); }

.footer-bottom {
  padding-top: var(--space-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-4);
}
.footer-copyright {
  font-size: var(--text-xs);
  color: rgba(255,255,255,0.35);
}
.footer-legal {
  display: flex; gap: var(--space-6);
}
.footer-legal a {
  font-size: var(--text-xs);
  color: rgba(255,255,255,0.35);
  transition: color var(--transition-fast);
}
.footer-legal a:hover { color: rgba(255,255,255,0.65); }

/* ── HEADER OFFSET ── */
.page-body { padding-top: 68px; }