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

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--color-white);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4rem;
}

/* Brand */
.brand {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--color-primary);
  font-weight: 700;
  font-size: var(--text-xl);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

.brand__icon {
  color: var(--color-accent);
  font-size: var(--text-2xl);
}

.brand__name {
  font-family: var(--font-sans);
  letter-spacing: -0.02em;
}

/* Navigation Toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 2.5rem;
  height: 2.5rem;
  padding: 0;
  background: transparent;
  border: none;
  cursor: pointer;
  gap: 5px;
  position: relative;
  z-index: 102;
}

.nav-toggle__bar {
  display: block;
  width: 1.5rem;
  height: 2px;
  background-color: var(--color-primary);
  transition: transform var(--transition-base), opacity var(--transition-base);
  transform-origin: center;
}

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

.nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-8);
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-list a {
  color: var(--color-text);
  font-weight: 500;
  font-size: var(--text-base);
  text-decoration: none;
  padding: var(--space-2) 0;
  position: relative;
  transition: color var(--transition-fast);
}

.nav-list a:hover,
.nav-list a:focus {
  color: var(--color-accent);
}

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

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

/* CTA Button in Nav */
.nav-cta {
  background-color: var(--color-primary);
  color: var(--color-white) !important;
  padding: var(--space-2) var(--space-5) !important;
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
  border: 2px solid transparent;
}

.nav-cta:hover {
  background-color: var(--color-accent);
  color: var(--color-navy) !important;
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.nav-cta::after {
  display: none !important;
}

/* Mobile Styles */
@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }

  .primary-nav {
    position: fixed;
    top: 0;
    right: -100%;
    width: min(80%, 320px);
    height: 100vh;
    background-color: var(--color-white);
    border-left: 1px solid var(--color-border);
    box-shadow: var(--shadow-xl);
    padding: 6rem var(--space-6) var(--space-6);
    transition: right var(--transition-slow);
    flex-direction: column;
    align-items: flex-start;
    overflow-y: auto;
  }

  .primary-nav.is-open {
    right: 0;
    z-index: 101;
  }

  .nav-list {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-4);
    width: 100%;
  }

  .nav-list li {
    width: 100%;
    border-bottom: 1px solid var(--color-border);
  }

  .nav-list a {
    display: block;
    width: 100%;
    padding: var(--space-3) 0;
    font-size: var(--text-lg);
  }

  .nav-cta {
    text-align: center;
    margin-top: var(--space-4);
    background-color: var(--color-accent);
    color: var(--color-navy) !important;
    font-weight: 600;
  }

  /* Hamburger to X Animation */
  .nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }

  .nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(2) {
    opacity: 0;
  }

  .nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }

  /* Backdrop overlay */
  .site-header::before {
    content: '';
    position: fixed;
    inset: 0;
    background-color: rgba(10, 25, 47, 0.5);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-base), visibility var(--transition-base);
    z-index: 99;
    pointer-events: none;
  }

  .site-header:has(.primary-nav.is-open)::before {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
  }
}

/* Focus styles */
.nav-toggle:focus-visible,
.nav-list a:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  .primary-nav {
    transition: none;
  }
  
  .nav-toggle__bar {
    transition: none;
  }
}