/* ============================================================
   MARS GROUP — Header & Footer CSS
   ============================================================ */

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

.site-header.scrolled {
  background: rgba(13, 12, 11, 0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom-color: var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  gap: 40px;
}

/* Logo */
.site-logo {
  display: flex;
  flex-direction: column;
  line-height: 1;
  gap: 2px;
  flex-shrink: 0;
}

.site-logo .logo-main {
  font-family: var(--font-display);
  font-size: 1.8rem;
  letter-spacing: 0.12em;
  color: var(--text-primary);
  transition: color var(--transition);
}

.site-logo .logo-sub {
  font-size: 0.6rem;
  letter-spacing: 0.22em;
  color: var(--text-muted);
  text-transform: uppercase;
}

.site-logo:hover .logo-main { color: var(--accent); }

/* Nav */
.header-nav {
  display: flex;
  align-items: center;
  gap: 32px;
}

.header-nav a {
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  color: var(--text-secondary);
  transition: color var(--transition);
  position: relative;
  padding-bottom: 2px;
}

.header-nav a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--accent);
  transition: width var(--transition);
}

.header-nav a:hover,
.header-nav a.active {
  color: var(--text-primary);
}

.header-nav a:hover::after,
.header-nav a.active::after {
  width: 100%;
}

/* Header CTA */
.header-cta {
  font-size: 0.78rem;
  padding: 10px 22px;
  flex-shrink: 0;
}

/* Mobile Menu */
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
}

.menu-toggle span {
  display: block;
  width: 24px;
  height: 1.5px;
  background: var(--text-primary);
  transition: var(--transition);
}

.menu-toggle.open span:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}

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

.menu-toggle.open span:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
}

/* Mobile Drawer */
.mobile-nav {
  display: none;
  position: fixed;
  top: 72px;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(13, 12, 11, 0.97);
  backdrop-filter: blur(20px);
  z-index: 999;
  flex-direction: column;
  padding: 48px 32px;
  gap: 8px;
  overflow-y: auto;
}

.mobile-nav.open {
  display: flex;
  animation: fadeIn 0.3s ease;
}

.mobile-nav a {
  font-family: var(--font-display);
  font-size: 1.8rem;
  letter-spacing: 0.08em;
  color: var(--text-secondary);
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
  transition: color var(--transition);
}

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

.mobile-nav-sub {
  margin-top: 32px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.mobile-nav-sub a {
  font-family: var(--font-body);
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  border: none;
  color: var(--text-muted);
}

/* --- Footer --- */
.site-footer {
  background: var(--bg-surface);
  border-top: 1px solid var(--border);
  padding: 80px 0 40px;
  margin-top: var(--section-gap);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 60px;
  margin-bottom: 60px;
}

.footer-brand .logo-main {
  font-family: var(--font-display);
  font-size: 2rem;
  letter-spacing: 0.12em;
  color: var(--text-primary);
}

.footer-brand .logo-sub {
  font-size: 0.6rem;
  letter-spacing: 0.22em;
  color: var(--text-muted);
  margin-top: 4px;
  margin-bottom: 20px;
}

.footer-brand p {
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.9;
  max-width: 280px;
}

.footer-col h4 {
  font-family: var(--font-display);
  font-size: 0.85rem;
  letter-spacing: 0.18em;
  color: var(--accent);
  margin-bottom: 20px;
}

.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-col ul a {
  font-size: 0.82rem;
  color: var(--text-muted);
  transition: color var(--transition);
}

.footer-col ul a:hover { color: var(--text-primary); }

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 40px;
  border-top: 1px solid var(--border);
}

.footer-bottom p {
  font-size: 0.75rem;
  color: var(--text-muted);
  letter-spacing: 0.05em;
}

.footer-links {
  display: flex;
  gap: 24px;
}

.footer-links a {
  font-size: 0.75rem;
  color: var(--text-muted);
  transition: color var(--transition);
}

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

/* --- Responsive --- */
@media (max-width: 1024px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 40px;
  }
}

@media (max-width: 768px) {
  .header-nav,
  .header-cta {
    display: none;
  }

  .menu-toggle {
    display: flex;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .footer-bottom {
    flex-direction: column;
    gap: 16px;
    text-align: center;
  }
}