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

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background-color: var(--color-white);
  border-bottom: 1px solid var(--color-slate-200);
}

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

/* Logo */
.site-logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  color: var(--color-navy-900);
  font-weight: var(--font-weight-bold);
  font-size: var(--font-size-lg);
  letter-spacing: -0.02em;
}

.site-logo:hover {
  text-decoration: none;
  color: var(--color-navy-800);
}

.site-logo__mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background-color: var(--color-navy-900);
  color: var(--color-white);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-bold);
  border-radius: var(--radius-md);
}

/* 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-link {
  display: block;
  padding: var(--space-2) 0;
  color: var(--color-slate-600);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  text-decoration: none;
  transition: color var(--transition-fast);
  position: relative;
}

.nav-link:hover {
  color: var(--color-navy-900);
  text-decoration: none;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--color-navy-900);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform var(--transition-base);
}

.nav-link:hover::after {
  transform: scaleX(1);
  transform-origin: left;
}

.btn--small {
  padding: var(--space-2) var(--space-4);
  font-size: var(--font-size-sm);
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 44px;
  height: 44px;
  padding: var(--space-2);
  background: transparent;
  border: none;
  cursor: pointer;
  gap: 6px;
  z-index: 50;
  border-radius: var(--radius-md);
  transition: background-color var(--transition-fast);
}

.mobile-menu-toggle:hover {
  background-color: var(--color-slate-100);
}

.mobile-menu-toggle:focus-visible {
  outline: 2px solid var(--color-navy-700);
  outline-offset: 2px;
}

.hamburger-line {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-navy-900);
  transition: transform var(--transition-base), opacity var(--transition-base);
  transform-origin: center;
}

/* Nav Backdrop */
.nav-backdrop {
  display: none;
  position: fixed;
  inset: 0;
  background-color: rgba(15, 23, 42, 0.5);
  opacity: 0;
  transition: opacity var(--transition-base);
  z-index: 30;
}

/* Mobile Styles */
@media (max-width: 767px) {
  .mobile-menu-toggle {
    display: flex;
  }

  .nav-backdrop {
    display: block;
    pointer-events: none;
  }

  .nav-backdrop.is-active {
    opacity: 1;
    pointer-events: auto;
  }

  .primary-nav {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    width: min(300px, 85vw);
    background-color: var(--color-white);
    border-left: 1px solid var(--color-slate-200);
    padding: calc(72px + var(--space-8)) var(--space-6) var(--space-6);
    transform: translateX(100%);
    transition: transform var(--transition-base);
    z-index: 35;
    overflow-y: auto;
  }

  .primary-nav.is-active {
    transform: translateX(0);
    box-shadow: var(--shadow-xl);
  }

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

  .nav-item {
    width: 100%;
  }

  .nav-link {
    font-size: var(--font-size-lg);
    padding: var(--space-3) 0;
    border-bottom: 1px solid var(--color-slate-100);
  }

  .nav-link::after {
    display: none;
  }

  .nav-item--cta {
    margin-top: var(--space-4);
    padding-top: var(--space-4);
    border-top: 1px solid var(--color-slate-200);
  }

  .nav-item--cta .btn {
    width: 100%;
    justify-content: center;
  }

  /* Hamburger Animation */
  .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);
  }

  /* Body scroll lock */
  body.nav-open {
    overflow: hidden;
  }
}