/* Header layout */
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background-color: var(--color-surface);
  box-shadow: var(--shadow-soft);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-3);
  padding-bottom: var(--space-3);
}

/* Branding */
.site-header__brand {
  display: flex;
  align-items: center;
}

.site-header__logo {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: 700;
  font-size: var(--font-size-lg);
  color: var(--gray-900);
}

.site-header__logo-mark {
  width: 32px;
  height: 32px;
  border-radius: 999px;
  background: radial-gradient(circle at 30% 20%, #ffffff 0, #e3f4ff 35%, #1f7ed6 100%);
  box-shadow: 0 0 0 2px rgba(31, 126, 214, 0.15);
}

.site-header__logo-text {
  letter-spacing: 0.02em;
}

/* Navigation */
.site-header__nav {
  display: flex;
  align-items: center;
}

.site-header__nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.site-header__nav-item {
  list-style: none;
}

.site-header__nav-link {
  position: relative;
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--gray-700);
  padding: 0.3rem 0;
}

.site-header__nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -0.15rem;
  width: 0;
  height: 2px;
  border-radius: var(--radius-full);
  background-color: var(--color-primary);
  transition: width var(--transition-normal);
}

.site-header__nav-link:hover,
.site-header__nav-link:focus-visible {
  color: var(--color-primary-dark);
}

.site-header__nav-link:hover::after,
.site-header__nav-link:focus-visible::after {
  width: 100%;
}

.site-header__nav-link--button {
  padding: 0.55rem 1.1rem;
  border-radius: var(--radius-full);
  border: 1px solid transparent;
  background-color: var(--color-primary);
  color: #ffffff;
  font-size: var(--font-size-sm);
  line-height: 1;
  box-shadow: var(--shadow-soft);
}

.site-header__nav-link--button::after {
  display: none;
}

.site-header__nav-link--button:hover,
.site-header__nav-link--button:focus-visible {
  background-color: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
  color: #ffffff;
}

.site-header__nav-item--cta {
  margin-left: var(--space-2);
}

/* Mobile toggle */
.site-header__toggle {
  display: none;
  position: relative;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  border: 1px solid var(--gray-200);
  align-items: center;
  justify-content: center;
  background-color: #ffffff;
}

.site-header__toggle-bar {
  width: 18px;
  height: 2px;
  border-radius: var(--radius-full);
  background-color: var(--gray-800);
  transition: transform var(--transition-normal), opacity var(--transition-normal), top var(--transition-normal), bottom var(--transition-normal);
}

.site-header__toggle:focus-visible {
  outline: none;
  box-shadow: var(--shadow-focus);
}

/* Toggle animation */
.site-header__toggle--open .site-header__toggle-bar:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.site-header__toggle--open .site-header__toggle-bar:nth-child(2) {
  opacity: 0;
}

.site-header__toggle--open .site-header__toggle-bar:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

/* Responsive behavior */
@media (max-width: 768px) {
  .site-header__toggle {
    display: inline-flex;
  }

  .site-header__nav {
    position: fixed;
    inset: 64px 0 auto 0;
    background-color: rgba(15, 23, 42, 0.32);
    pointer-events: none;
    opacity: 0;
    transition: opacity var(--transition-normal);
  }

  .site-header__nav-list {
    flex-direction: column;
    /* align-items: flex-start; */
    gap: var(--space-3);
    background-color: var(--color-surface);
    padding: var(--space-6);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-medium);
    width: 100%;
  }

  .site-header__nav-link {
    font-size: var(--font-size-base);
  }

  .site-header__nav-link--button {
    display: inline-flex;
    width: 100%;
    justify-content: center;
  }

  .site-header__nav--open {
    opacity: 1;
    pointer-events: auto;
  }
}

@media (min-width: 769px) {
  .site-header__nav {
    position: static;
    opacity: 1;
    pointer-events: auto;
  }
}