.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background-color: var(--color-ivory);
  transition: background-color 0.2s ease, box-shadow 0.2s ease;
}

.site-header.is-scrolled {
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--container-max);
  margin-inline: auto;
  padding: var(--space-4) var(--container-padding);
  min-height: 72px;
}

.site-header__brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  color: var(--color-ink);
  flex-shrink: 0;
}

.site-header__logo {
  width: 40px;
  height: 40px;
  object-fit: contain;
  display: block;
}

.site-header__wordmark {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-ink);
  line-height: 1;
}

.site-header__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0;
  z-index: 1001;
}

.site-header__toggle-line {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-ink);
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.site-header__toggle[aria-expanded="true"] .site-header__toggle-line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.site-header__toggle[aria-expanded="true"] .site-header__toggle-line:nth-child(2) {
  opacity: 0;
}

.site-header__toggle[aria-expanded="true"] .site-header__toggle-line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.site-header__toggle:focus-visible {
  outline: 2px solid var(--color-royal);
  outline-offset: 2px;
}

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

.site-header__nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-5);
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-header__nav-list li {
  margin: 0;
  padding: 0;
}

.site-header__nav-list a {
  display: inline-block;
  font-family: var(--font-body);
  font-size: 0.9375rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--color-ink);
  text-decoration: none;
  padding: var(--space-2) 0;
  transition: color 0.2s ease;
  white-space: nowrap;
}

.site-header__nav-list a:hover {
  color: var(--color-clay);
}

.site-header__nav-list a:focus-visible {
  outline: 2px solid var(--color-royal);
  outline-offset: 4px;
}

@media (max-width: 900px) {
  .site-header__inner {
    min-height: 64px;
    padding-block: var(--space-3);
  }

  .site-header__logo {
    width: 32px;
    height: 32px;
  }

  .site-header__wordmark {
    font-size: 1rem;
  }

  .site-header__toggle {
    display: flex;
  }

  .site-header__nav {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    width: min(320px, 85vw);
    background-color: var(--color-ivory);
    box-shadow: -4px 0 20px rgba(0, 0, 0, 0.1);
    transform: translateX(100%);
    transition: transform 0.3s ease;
    z-index: 1000;
    overflow-y: auto;
    padding: var(--space-8) var(--space-6) var(--space-6);
    display: block;
  }

  .site-header__nav.is-open {
    transform: translateX(0);
  }

  .site-header__nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-4);
  }

  .site-header__nav-list a {
    display: block;
    font-size: 1.125rem;
    padding: var(--space-3) 0;
    border-bottom: 1px solid var(--color-silver);
  }

  .site-header__nav-list li:last-child a {
    border-bottom: none;
  }
}

@media (max-width: 480px) {
  .site-header__inner {
    padding-inline: var(--space-4);
  }

  .site-header__wordmark {
    display: none;
  }
}