.site-header {
  position: sticky;
  inset-block-start: 0;
  z-index: 50;
  background: color-mix(in oklch, var(--color-white) 92%, transparent);
  backdrop-filter: blur(12px);
  box-shadow: 0 2px 16px -8px oklch(0.6 0.15 350 / 0.3);
}

.site-header__inner {
  max-inline-size: var(--max-width);
  margin-inline: auto;
  padding-inline: clamp(16px, 2vw, 32px);
  padding-block: 12px;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: clamp(12px, 2vw, 32px);
}

.site-header__logo {
  display: block;
  inline-size: clamp(88px, 8vw, 120px);
}

.site-header__logo img {
  inline-size: 100%;
  block-size: auto;
}

.site-nav__list {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(0, 1fr);
  gap: clamp(4px, 1vw, 16px);
  justify-content: center;
}

.site-nav__link {
  display: grid;
  justify-items: center;
  gap: 2px;
  padding-block: 4px;
  color: var(--color-pink-600);
  font-family: var(--font-en);
  font-weight: 600;
  letter-spacing: 0.04em;
  transition: color 0.25s ease, transform 0.25s ease;
}

.site-nav__icon {
  inline-size: 40px;
  block-size: 40px;
  display: grid;
  place-items: center;
  border-radius: 100vmax;
  background: var(--color-pink-100);
  color: var(--color-pink-600);
  transition: background-color 0.25s ease, color 0.25s ease;
}

.site-nav__icon svg {
  inline-size: 22px;
  block-size: 22px;
}

.site-nav__label-en {
  font-size: var(--font-size-xs);
  font-weight: 700;
}

.site-nav__label-jp {
  font-size: 10px;
  color: oklch(0.55 0.1 355);
  font-family: var(--font-jp);
  letter-spacing: 0;
  line-height: 1.2;
}

@media (any-hover: hover) {
  .site-nav__link:hover {
    color: var(--color-pink-700);
    transform: translateY(-2px);
  }
  .site-nav__link:hover .site-nav__icon {
    background: var(--color-pink-300);
    color: var(--color-white);
  }
}

.site-header__cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: 100vmax;
  background: linear-gradient(
    135deg,
    oklch(0.72 0.2 0) 0%,
    oklch(0.6 0.22 10) 100%
  );
  color: var(--color-white);
  font-family: var(--font-en);
  font-weight: 700;
  box-shadow: 0 6px 16px -8px oklch(0.55 0.2 10 / 0.6);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.site-header__cta-icon svg {
  inline-size: 20px;
  block-size: 20px;
}

.site-header__cta-text {
  display: grid;
  line-height: 1.1;
}

.site-header__cta-en {
  font-size: var(--font-size-sm);
  font-weight: 700;
  letter-spacing: 0.05em;
}

.site-header__cta-jp {
  font-size: 10px;
  font-family: var(--font-jp);
}

@media (any-hover: hover) {
  .site-header__cta:hover {
    transform: translateY(-2px) scale(1.02);
    box-shadow: 0 10px 24px -10px oklch(0.55 0.2 10 / 0.8);
  }
}

.site-header__toggle {
  display: none;
  inline-size: 44px;
  block-size: 44px;
  border: 0;
  background: transparent;
  cursor: pointer;
  position: relative;
}

.site-header__toggle span {
  display: block;
  position: absolute;
  inset-inline: 10px;
  block-size: 3px;
  background: var(--color-pink-600);
  border-radius: 2px;
  transition: transform 0.3s ease, opacity 0.3s ease, top 0.3s ease;
}

.site-header__toggle span:nth-child(1) {
  top: 12px;
}
.site-header__toggle span:nth-child(2) {
  top: 20px;
}
.site-header__toggle span:nth-child(3) {
  top: 28px;
}

.site-header__toggle[aria-expanded="true"] span:nth-child(1) {
  top: 20px;
  transform: rotate(45deg);
}
.site-header__toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}
.site-header__toggle[aria-expanded="true"] span:nth-child(3) {
  top: 20px;
  transform: rotate(-45deg);
}

@media (width < 768px) {
  .site-header__inner {
    grid-template-columns: auto 1fr auto;
  }
  .site-header__toggle {
    display: block;
  }
  .site-header__cta {
    padding: 8px 12px;
  }
  .site-header__cta-jp {
    display: none;
  }
  .site-nav {
    position: absolute;
    inset-inline: 0;
    inset-block-start: 100%;
    background: var(--color-white);
    border-block-start: 2px solid var(--color-pink-200);
    padding: 20px;
    transform: translateY(-8px);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.25s ease, transform 0.25s ease, visibility 0.25s;
    box-shadow: 0 12px 24px -12px oklch(0.6 0.15 350 / 0.3);
  }
  .site-nav[data-open="true"] {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }
  .site-nav__list {
    grid-auto-flow: row;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
  }
  .site-nav__icon {
    inline-size: 44px;
    block-size: 44px;
  }
}