/* Header Styles - FashionInsight2026 */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--color-bg-secondary);
  border-bottom: 1px solid var(--color-border-light);
  transition: box-shadow var(--transition-base);
}

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

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

/* Logo */
.site-logo {
  display: flex;
  align-items: center;
  text-decoration: none;
  z-index: 102;
}

.logo-text {
  font-family: var(--font-serif);
  font-size: var(--text-2xl);
  font-weight: 500;
  letter-spacing: var(--tracking-wide);
  color: var(--color-text-primary);
  line-height: 1;
}

.logo-year {
  color: var(--color-primary);
  font-weight: 400;
}

/* Navigation */
.primary-nav {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

.nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-link {
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  font-weight: 500;
  letter-spacing: var(--tracking-wider);
  text-transform: uppercase;
  color: var(--color-text-primary);
  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: 1px;
  background-color: var(--color-primary);
  transition: width var(--transition-base);
}

.nav-link:hover,
.nav-link:focus {
  color: var(--color-primary);
  text-decoration: none;
}

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

.nav-cta {
  margin-left: var(--space-4);
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 32px;
  height: 32px;
  padding: 0;
  background: transparent;
  border: none;
  cursor: pointer;
  z-index: 102;
}

.hamburger-line {
  display: block;
  width: 24px;
  height: 1.5px;
  background-color: var(--color-text-primary);
  transition: transform var(--transition-base), opacity var(--transition-base);
  transform-origin: center;
}

.mobile-menu-toggle[aria-expanded="true"] .hamburger-line:nth-child(1) {
  transform: translateY(6.5px) 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(-6.5px) rotate(-45deg);
}

/* Mobile Overlay */
.mobile-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background-color: rgba(26, 26, 26, 0.5);
  opacity: 0;
  transition: opacity var(--transition-base);
  z-index: 99;
}

.mobile-overlay.is-visible {
  opacity: 1;
}

/* Responsive */
@media (max-width: 1024px) {
  .mobile-menu-toggle {
    display: flex;
  }
  
  .primary-nav {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    width: min(320px, 85vw);
    background-color: var(--color-bg-secondary);
    flex-direction: column;
    align-items: flex-start;
    padding: calc(80px + var(--space-8)) var(--space-6) var(--space-6);
    transform: translateX(100%);
    transition: transform var(--transition-base);
    box-shadow: var(--shadow-2xl);
    z-index: 101;
    gap: var(--space-6);
    overflow-y: auto;
  }
  
  .primary-nav.is-open {
    transform: translateX(0);
  }
  
  .nav-list {
    flex-direction: column;
    align-items: flex-start;
    width: 100%;
    gap: var(--space-1);
  }
  
  .nav-list li {
    width: 100%;
    border-bottom: 1px solid var(--color-border-light);
  }
  
  .nav-link {
    display: block;
    padding: var(--space-4) 0;
    font-size: var(--text-lg);
    font-weight: 400;
    letter-spacing: var(--tracking-normal);
    text-transform: none;
    font-family: var(--font-serif);
  }
  
  .nav-link::after {
    display: none;
  }
  
  .nav-actions {
    width: 100%;
    margin-top: auto;
    padding-top: var(--space-6);
  }
  
  .nav-cta {
    width: 100%;
    margin-left: 0;
    justify-content: center;
  }
  
  .mobile-overlay.is-visible {
    display: block;
  }
  
  body.menu-is-open {
    overflow: hidden;
  }
}

@media (max-width: 640px) {
  .header-container {
    height: 64px;
  }
  
  .logo-text {
    font-size: var(--text-xl);
  }
  
  .primary-nav {
    padding-top: calc(64px + var(--space-6));
  }
}