/* Header Layout */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-gray-200);
  height: var(--header-height);
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

/* Logo */
.site-logo {
  display: flex;
  align-items: center;
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: -0.02em;
  text-decoration: none;
  z-index: 60;
}

.site-logo__text {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

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

.nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-base);
  font-weight: 500;
  color: var(--color-text-secondary);
  border-radius: var(--radius-md);
  transition: color var(--transition-fast), background-color var(--transition-fast);
  text-decoration: none;
}

.nav-link:hover,
.nav-link:focus-visible {
  color: var(--color-primary);
  background-color: var(--color-gray-100);
}

.nav-link--cta {
  background-color: var(--color-primary);
  color: white;
  margin-left: var(--space-2);
}

.nav-link--cta:hover,
.nav-link--cta:focus-visible {
  background-color: var(--color-primary-hover);
  color: white;
}

/* Mobile Toggle */
.mobile-menu-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  padding: 0;
  background: transparent;
  border: none;
  cursor: pointer;
  border-radius: var(--radius-md);
  z-index: 60;
}

.hamburger {
  position: relative;
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-text);
  transition: background-color var(--transition-fast);
}

.hamburger::before,
.hamburger::after {
  content: '';
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--color-text);
  transition: transform var(--transition-base), top var(--transition-base);
}

.hamburger::before { top: -7px; }
.hamburger::after { top: 7px; }

/* Mobile Styles */
@media (max-width: 768px) {
  .mobile-menu-toggle {
    display: flex;
  }
  
  .nav-list {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    width: min(80vw, 300px);
    flex-direction: column;
    align-items: flex-start;
    padding: calc(var(--header-height) + var(--space-6)) var(--space-6) var(--space-6);
    background-color: var(--color-surface);
    box-shadow: var(--shadow-xl);
    transform: translateX(100%);
    transition: transform var(--transition-base);
    gap: var(--space-1);
  }
  
  .nav-list.is-open {
    transform: translateX(0);
    z-index: 51;
  }
  
  .nav-link {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    font-size: var(--text-lg);
  }
  
  .nav-link--cta {
    margin-left: 0;
    margin-top: var(--space-4);
    justify-content: center;
  }
  
  /* Animated hamburger */
  .mobile-menu-toggle[aria-expanded="true"] .hamburger {
    background-color: transparent;
  }
  
  .mobile-menu-toggle[aria-expanded="true"] .hamburger::before {
    top: 0;
    transform: rotate(45deg);
  }
  
  .mobile-menu-toggle[aria-expanded="true"] .hamburger::after {
    top: 0;
    transform: rotate(-45deg);
  }
  
  /* Backdrop */
  .main-nav::before {
    content: '';
    position: fixed;
    inset: 0;
    background-color: rgba(44, 53, 49, 0.5);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-base), visibility var(--transition-base);
    z-index: 40;
  }
  
  .main-nav:has(.nav-list.is-open)::before {
    opacity: 1;
    visibility: visible;
  }
}

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