/* ============================================
   HEADER STYLES
   ============================================ */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-fixed);
  background-color: rgba(10, 10, 11, 0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  transition: background-color var(--transition-base);
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 80px;
}

/* Logo */
.logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-family: 'Playfair Display', serif;
  font-size: var(--text-2xl);
  font-weight: 600;
  color: var(--color-text);
  letter-spacing: var(--tracking-tight);
  transition: color var(--transition-fast);
}

.logo i {
  color: var(--color-accent);
  font-size: var(--text-xl);
}

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

/* Navigation */
.main-nav {
  display: flex;
  align-items: center;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-8);
  list-style: none;
}

.nav-link {
  font-size: var(--text-sm);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: var(--tracking-wide);
  color: var(--color-text-secondary);
  padding: var(--space-2) 0;
  position: relative;
  transition: color var(--transition-fast);
}

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

.nav-link:hover {
  color: var(--color-text);
}

.nav-link:hover::after {
  width: 100%;
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 44px;
  height: 44px;
  gap: 6px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: var(--space-2);
}

.hamburger-line {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-text);
  transition: all var(--transition-base);
  transform-origin: center;
}

.mobile-menu-toggle[aria-expanded="true"] .hamburger-line:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}

.mobile-menu-toggle[aria-expanded="true"] .hamburger-line:nth-child(2) {
  opacity: 0;
}

.mobile-menu-toggle[aria-expanded="true"] .hamburger-line:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

.mobile-only {
  display: none;
}

/* Responsive */
@media (max-width: 1024px) {
  .desktop-only {
    display: none;
  }
  
  .mobile-only {
    display: block;
  }
  
  .mobile-menu-toggle {
    display: flex;
  }
  
  .nav-list {
    position: fixed;
    top: 80px;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--color-bg);
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    padding-top: var(--space-12);
    gap: var(--space-6);
    transform: translateX(100%);
    transition: transform var(--transition-slow);
    border-top: 1px solid var(--color-border);
  }
  
  .nav-list.is-open {
    transform: translateX(0);
    height: 350px;
  }
  
  .nav-link {
    font-size: var(--text-lg);
    padding: var(--space-3) var(--space-4);
  }
  
  .nav-link::after {
    display: none;
  }
}

@media (max-width: 640px) {
  .header-container {
    height: 72px;
  }
  
  .logo-text {
    font-size: var(--text-xl);
  }
  
  .nav-list {
    top: 72px;
  }
}