.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: blur(20px);
  background: linear-gradient(to bottom, rgba(252, 247, 255, 0.92), rgba(252, 247, 255, 0.78));
  box-shadow: var(--shadow-xs);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: var(--space-4);
  gap: var(--space-6);
}

.site-header__brand {
  display: flex;
  align-items: center;
  min-width: 0;
}

.site-header__logo-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  color: var(--color-text);
}

.site-header__logo-link::after {
  content: none;
}

.site-header__logo-mark {
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 40% 60% 55% 45%;
  background: radial-gradient(circle at 30% 20%, #fff6fb 0, transparent 55%),
              radial-gradient(circle at 70% 80%, #e6fff7 0, transparent 50%),
              linear-gradient(135deg, var(--color-primary), var(--color-accent-sky));
  box-shadow: var(--shadow-sm);
  position: relative;
}

.site-header__logo-mark::before,
.site-header__logo-mark::after {
  content: "";
  position: absolute;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.85);
}

.site-header__logo-mark::before {
  width: 0.55rem;
  height: 0.55rem;
  top: 28%;
  left: 26%;
}

.site-header__logo-mark::after {
  width: 0.38rem;
  height: 0.38rem;
  top: 40%;
  left: 40%;
}

.site-header__title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: 0.04em;
  white-space: nowrap;
}

.site-header__subtitle {
  display: none;
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

@media (min-width: 720px) {
  .site-header__subtitle {
    display: inline-block;
  }
}

.site-header__nav {
  display: flex;
}

.site-header__nav-list {
  width: 100%;
  display: flex;
  align-items: center;
  gap: var(--space-4);
  list-style: none;
}

.site-header__nav-item--highlight .site-header__nav-link {
  padding-inline: var(--space-4);
  padding-block: 0.45rem;
  border-radius: var(--radius-pill);
  background: var(--color-primary-soft);
  border: 1px solid rgba(244, 143, 177, 0.35);
  box-shadow: var(--shadow-xs);
}

.site-header__nav-link {
  position: relative;
  font-weight: 600;
  font-size: var(--font-size-sm);
  color: var(--color-text);
  padding-block: 0.25rem;
}

.site-header__nav-link::after {
  bottom: -0.15em;
}

.site-header__nav-link:focus-visible {
  outline: none;
  box-shadow: 0 0 0 2px rgba(244, 143, 177, 0.6);
  border-radius: var(--radius-pill);
}

.site-header__toggle {
  display: none;
  align-items: center;
  gap: var(--space-2);
  padding: 0.4rem 0.75rem;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(148, 130, 171, 0.3);
  background: rgba(255, 255, 255, 0.85);
  color: var(--color-text);
}

.site-header__toggle:focus-visible {
  outline: none;
  box-shadow: 0 0 0 2px rgba(244, 143, 177, 0.6);
}

.site-header__toggle-icon {
  position: relative;
  width: 1.25rem;
  height: 1rem;
  display: inline-flex;
  flex-direction: column;
  justify-content: space-between;
}

.site-header__toggle-line {
  height: 2px;
  border-radius: 999px;
  background: var(--color-text);
  transition: transform var(--transition-normal), opacity var(--transition-normal), width var(--transition-normal);
}

.site-header__toggle-text {
  font-size: var(--font-size-sm);
  font-weight: 600;
}

.site-header--menu-open .site-header__toggle-line:nth-child(1) {
  transform: translateY(7px) rotate(42deg);
}

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

.site-header--menu-open .site-header__toggle-line:nth-child(3) {
  transform: translateY(-6px) rotate(-42deg);
}

@media (max-width: 880px) {
  .site-header__inner {
    padding-block: var(--space-3);
  }

  .site-header__nav {
    position: absolute;
    inset-inline: 0;
    top: 100%;
    transform: translateY(-8px);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity var(--transition-normal), transform var(--transition-normal), visibility var(--transition-normal);
  }

  .site-header__nav-list {
    flex-direction: column;
    align-items: stretch;
    margin: var(--space-3) var(--space-6) var(--space-5);
    padding: var(--space-4);
    border-radius: var(--radius-lg);
    background: var(--color-surface);
    box-shadow: var(--shadow-md);
  }

  .site-header__nav-link {
    padding-block: 0.5rem;
    width: 100%;
  }

  .site-header__toggle {
    display: inline-flex;
  }

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

@media (max-width: 520px) {
  .site-header__title {
    font-size: 1rem;
  }
}