/* ============================================
   Site Header
   ============================================ */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-header);
  height: var(--header-height);
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-gray-200);
}

.header-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-6);
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 100%;
}

.logo {
  font-family: var(--font-heading);
  font-weight: 700;
  color: var(--color-primary);
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-2xl);
  text-decoration: none;
}

.logo:hover {
  color: var(--color-primary);
}

.logo img {
  height: 40px;
  width: auto;
}

/* ============================================
   Navigation
   ============================================ */

.nav {
  display: flex;
  gap: var(--space-8);
}

.nav-link {
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-size: var(--text-sm);
  color: var(--color-dark);
  position: relative;
  padding: var(--space-2) 0;
  text-decoration: none;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--color-primary);
  transform: scaleX(0);
  transition: transform var(--transition-base);
}

.nav-link:hover::after,
.nav-link.active::after {
  transform: scaleX(1);
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-primary);
}

/* ============================================
   Hamburger Toggle (Mobile)
   ============================================ */

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-2);
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-dark);
  margin: 5px 0;
  transition: var(--transition-base);
}

/* ============================================
   Main Content
   ============================================ */

.main-content {
  padding-top: var(--header-height);
}

/* ============================================
   Footer
   ============================================ */

.site-footer {
  background: var(--color-dark);
  color: var(--color-gray-300);
  padding: var(--space-16) 0;
}

.footer-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

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

.footer-heading {
  color: var(--color-white);
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  margin-bottom: var(--space-4);
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.footer-links a {
  color: var(--color-gray-400);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

.footer-bottom {
  border-top: 1px solid var(--color-dark-light);
  padding-top: var(--space-8);
  margin-top: var(--space-12);
  text-align: center;
  font-size: var(--text-sm);
}

/* ============================================
   Grid System
   ============================================ */

.grid-2,
.grid-3,
.grid-4 {
  display: grid;
  gap: var(--space-8);
}

/* ============================================
   Responsive - Mobile (max-width: 767px)
   ============================================ */

@media (max-width: 767px) {
  .nav-toggle {
    display: block;
  }

  .nav {
    display: none;
  }

  .nav-open .nav {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--color-white);
    padding: var(--space-6);
    box-shadow: var(--shadow-md);
  }
}

/* ============================================
   Responsive - Tablet (768px+)
   ============================================ */

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

  .grid-2 {
    grid-template-columns: repeat(2, 1fr);
  }

  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }

  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ============================================
   Responsive - Desktop (1024px+)
   ============================================ */

@media (min-width: 1024px) {
  .footer-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .grid-2 {
    grid-template-columns: repeat(2, 1fr);
  }

  .grid-3 {
    grid-template-columns: repeat(3, 1fr);
  }

  .grid-4 {
    grid-template-columns: repeat(4, 1fr);
  }
}