/* ============================================================
   LAYOUT COMPONENTS — Header, Footer, Nav, Page Scaffolding
   ============================================================ */

/* ── SITE HEADER ── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(248, 247, 244, 0.94);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-divider);
  transition:
    box-shadow var(--transition-smooth),
    background var(--transition-smooth);
}

[data-theme='dark'] .site-header {
  background: rgba(17, 18, 16, 0.94);
}

.site-header.scrolled {
  box-shadow: var(--shadow-sm);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  gap: var(--space-8);
}

/* ── LOGO ── */
.site-logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  flex-shrink: 0;
}

.site-logo img {
  height: 48px;
  width: auto;
}

.logo-text {
  display: flex;
  flex-direction: column;
  gap: 1px;
}

.logo-name {
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 800;
  color: var(--brand-navy);
  letter-spacing: -0.01em;
  line-height: 1.1;
}

.logo-tagline {
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}

[data-theme='dark'] .logo-name { color: var(--color-text); }

/* ── NAVIGATION ── */
.main-nav {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  list-style: none;
}

.nav-item {
  position: relative;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  text-decoration: none;
  border-radius: var(--radius-md);
  white-space: nowrap;
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-text);
  background: var(--color-surface-2);
}

.nav-link svg {
  width: 14px;
  height: 14px;
  opacity: 0.6;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.nav-item:hover .nav-link svg {
  transform: rotate(180deg);
  opacity: 1;
}

/* ── DROPDOWN ── */
.nav-dropdown {
  position: absolute;
  top: calc(100% + var(--space-2));
  left: 0;
  min-width: 220px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: var(--space-2);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition:
    opacity var(--transition-interactive),
    visibility var(--transition-interactive),
    transform var(--transition-interactive);
  z-index: 200;
}

.nav-item:hover .nav-dropdown,
.nav-item:focus-within .nav-dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.nav-dropdown a {
  display: block;
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  border-radius: var(--radius-md);
  text-decoration: none;
}

.nav-dropdown a:hover {
  color: var(--color-text);
  background: var(--color-surface-2);
}

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

.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  color: var(--color-text-muted);
  cursor: pointer;
  background: none;
  border: none;
}

.theme-toggle:hover {
  background: var(--color-surface-2);
  color: var(--color-text);
}

/* ── CSS-ONLY MOBILE MENU ── */
/* Hidden checkbox drives open/close — works on all browsers, no JS needed */
.mobile-menu-checkbox {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
  pointer-events: none;
}

.mobile-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  cursor: pointer;
  background: none;
  border: 1px solid transparent;
  padding: var(--space-2);
  border-radius: var(--radius-md);
  flex-shrink: 0;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}

.mobile-toggle:hover {
  background: var(--color-surface-2);
}

.mobile-toggle span {
  display: block;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform 0.25s ease, opacity 0.2s ease;
  transform-origin: center;
}

/* Open state via checkbox */
.mobile-menu-checkbox:checked ~ .mobile-toggle span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.mobile-menu-checkbox:checked ~ .mobile-toggle span:nth-child(2) {
  opacity: 0;
}
.mobile-menu-checkbox:checked ~ .mobile-toggle span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ── MOBILE NAV ── */
.mobile-nav {
  display: none;
  flex-direction: column;
  gap: var(--space-1);
  padding: var(--space-4) 0;
  border-top: 1px solid var(--color-divider);
  background: var(--color-surface);
}

/* JS fallback — still works if JS adds .open */
.mobile-nav.open {
  display: flex;
}

.mobile-nav a {
  display: block;
  padding: var(--space-3) var(--space-6);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  text-decoration: none;
  border-radius: var(--radius-md);
  margin-inline: var(--space-4);
}

.mobile-nav a:hover {
  color: var(--color-text);
  background: var(--color-surface-2);
}

.mobile-nav .mobile-section-label {
  padding: var(--space-3) var(--space-6) var(--space-1);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-faint);
}

.mobile-nav .mobile-cta {
  margin: var(--space-4) var(--space-4) var(--space-2);
  text-align: center;
  background: var(--color-accent);
  color: #fff;
  border-radius: var(--radius-md);
  padding: var(--space-3) var(--space-6);
  font-weight: 600;
}

.mobile-nav .mobile-cta:hover {
  background: var(--color-accent-hover);
  color: #fff;
}

/* ── SITE FOOTER ── */
.site-footer {
  background: var(--brand-navy);
  color: rgba(255, 255, 255, 0.75);
  padding-block: clamp(var(--space-16), 6vw, var(--space-24));
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: var(--space-12);
  margin-bottom: var(--space-12);
}

.footer-brand .footer-logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-6);
  text-decoration: none;
}

.footer-brand .footer-logo img {
  height: 52px;
  width: auto;
  filter: brightness(0) invert(1);
  opacity: 0.85;
}

.footer-brand .footer-logo-text {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 800;
  color: #fff;
  letter-spacing: -0.01em;
}

.footer-tagline {
  font-size: var(--text-sm);
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.6);
  margin-bottom: var(--space-6);
  max-width: 28ch;
}

.footer-contact-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-3);
  font-size: var(--text-sm);
  color: rgba(255,255,255,0.7);
}

.footer-contact-item a {
  color: rgba(255,255,255,0.85);
  text-decoration: none;
}

.footer-contact-item a:hover { color: #fff; }

.footer-heading {
  font-family: var(--font-sans);
  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-5);
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.footer-links a {
  font-size: var(--text-sm);
  color: rgba(255,255,255,0.65);
  text-decoration: none;
}

.footer-links a:hover { color: #fff; }

.footer-bottom {
  padding-top: var(--space-8);
  border-top: 1px solid rgba(255,255,255,0.1);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
  flex-wrap: wrap;
}

.footer-copyright {
  font-size: var(--text-xs);
  color: rgba(255,255,255,0.4);
}

/* ── RESPONSIVE ── */
@media (max-width: 1024px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-10);
  }
}

@media (max-width: 768px) {
  .main-nav .nav-list,
  .header-actions .btn {
    display: none;
  }

  .mobile-toggle {
    display: flex;
  }

  /* CSS-only nav open state — checkbox is a direct sibling of .mobile-nav */
  .mobile-menu-checkbox:checked ~ .mobile-nav {
    display: flex;
  }

  .header-inner {
    height: 64px;
  }

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

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
}