.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(249, 251, 255, 0.9);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--color-gray-100);
}

.site-header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding-block: 0.6rem;
}

.site-branding {
  display: flex;
  align-items: center;
}

.site-logo-link {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
}

.site-logo-mark {
  width: 2.25rem;
  height: 2.25rem;
  border-radius: 1.2rem;
  background-image: var(--gradient-primary);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  font-weight: 700;
  font-family: "Poppins", var(--font-sans);
  letter-spacing: 0.03em;
  box-shadow: var(--shadow-sm);
}

.site-logo-text {
  display: flex;
  flex-direction: column;
}

.site-logo-title {
  font-size: var(--font-size-lg);
  font-weight: 700;
}

.site-logo-subtitle {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

.site-nav {
  margin-left: auto;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  padding: 0.45rem 0.8rem;
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  transition: background var(--transition-fast), color var(--transition-fast), box-shadow var(--transition-fast), transform var(--transition-fast);
}

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

.nav-link[aria-current="page"] {
  color: var(--color-primary-strong);
  background: rgba(37, 99, 235, 0.08);
}

.header-cta-wrapper {
  display: none;
}

.header-cta {
  font-size: var(--font-size-sm);
}

.header-cta-icon {
  display: inline-flex;
}

.nav-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-gray-200);
  padding: 0.35rem 0.7rem;
  background: #ffffff;
  color: var(--color-text);
}

.nav-toggle:focus-visible {
  outline: 3px solid rgba(37, 99, 235, 0.85);
  outline-offset: 2px;
}

.nav-toggle-box {
  display: inline-flex;
  flex-direction: column;
  gap: 3px;
}

.nav-toggle-line {
  width: 18px;
  height: 2px;
  border-radius: 999px;
  background: var(--color-gray-700);
  transition: transform var(--transition-normal), opacity var(--transition-fast), background var(--transition-fast);
}

.nav-toggle-label {
  font-size: var(--font-size-xs);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
}

.site-header.menu-open .nav-toggle-line:nth-child(1) {
  transform: translateY(5px) rotate(45deg);
}

.site-header.menu-open .nav-toggle-line:nth-child(2) {
  opacity: 0;
}

.site-header.menu-open .nav-toggle-line:nth-child(3) {
  transform: translateY(-5px) rotate(-45deg);
}

.site-header.menu-open .nav-toggle-label {
  color: var(--color-primary-strong);
}

.site-header.menu-open .nav-toggle {
  border-color: rgba(37, 99, 235, 0.35);
}

@media (max-width: 767px) {
  .site-nav {
    position: fixed;
    inset-inline: 0;
    top: 3.25rem;
    background: rgba(249, 251, 255, 0.98);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid var(--color-gray-100);
    transform: translateY(-120%);
    opacity: 0;
    pointer-events: none;
    transition: transform var(--transition-normal), opacity var(--transition-normal);
  }

  .site-header.menu-open .site-nav {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    padding: 0.5rem 1rem 1rem;
  }

  .nav-link {
    justify-content: space-between;
    width: 100%;
  }

  .header-cta-wrapper {
    display: none;
  }
}

@media (min-width: 768px) {
  .site-header-inner {
    padding-block: 0.8rem;
  }

  .nav-toggle {
    display: none;
  }

  .site-nav {
    position: static;
    transform: none !important;
    opacity: 1 !important;
    pointer-events: auto !important;
    background: transparent;
    border: none;
  }

  .header-cta-wrapper {
    display: inline-flex;
    margin-left: var(--space-4);
  }
}

@media (min-width: 1024px) {
  .nav-list {
    gap: 1.1rem;
  }

  .site-logo-title {
    font-size: 1.25rem;
  }
}