.site-header {
  position: relative;
  z-index: 100;
  min-height: 4.75rem;
  border-bottom: var(--border-subtle);
  background: var(--color-white);
}

.site-header__inner {
  display: flex;
  align-items: center;
  min-height: 4.75rem;
  gap: clamp(0.75rem, 1.5vw, 1.5rem);
}

.site-header__brand {
  display: flex;
  flex: 0 1 auto;
  align-items: center;
  min-width: 0;
  gap: 0.625rem;
  color: var(--color-ink);
  text-decoration: none;
}

.site-header__brand:visited { color: var(--color-ink); }
.site-header__brand:hover { color: var(--color-blue); text-decoration: none; }

.site-header__mark {
  flex: 0 0 2.25rem;
  width: 2.25rem;
  height: 2.25rem;
  object-fit: contain;
}

.site-header__brand-copy {
  display: grid;
  min-width: 0;
  line-height: 1;
}

.site-header__brand-name {
  overflow: hidden;
  font-family: var(--font-heading);
  font-size: 1.125rem;
  font-weight: 700;
  letter-spacing: -0.05em;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.site-header__brand-note {
  margin-top: 0.25rem;
  color: var(--color-asphalt);
  font-size: 0.625rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  line-height: 1.1;
  text-transform: uppercase;
  white-space: nowrap;
}

.site-header__nav {
  min-width: 0;
}

.site-header__nav-list {
  display: flex;
  align-items: center;
  gap: clamp(0.5rem, 1.15vw, 1rem);
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-header__nav-list li,
.site-header__nav-list li + li {
  display: flex;
  align-items: center;
  margin: 0;
  padding: 0;
}

.site-header__nav-list a {
  display: inline-flex;
  align-items: center;
  min-height: 2.75rem;
  color: var(--color-ink);
  font-family: var(--font-heading);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: -0.015em;
  line-height: 1;
  text-decoration: none;
  white-space: nowrap;
}

.site-header__nav-list a:visited { color: var(--color-ink); }
.site-header__nav-list a:hover,
.site-header__nav-list a[aria-current="page"] { color: var(--color-blue); }
.site-header__nav-list a[aria-current="page"] { box-shadow: inset 0 -2px var(--color-red); }

.site-header__play,
.site-header__play:visited {
  display: inline-flex;
  flex: 0 0 auto;
  align-items: center;
  justify-content: center;
  min-height: 2.75rem;
  padding: 0.625rem 0.75rem;
  border: 1px solid var(--color-red);
  background: var(--color-red);
  color: var(--color-white);
  font-family: var(--font-heading);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  line-height: 1;
  text-decoration: none;
  white-space: nowrap;
  transition: background-color var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast);
}

.site-header__play:hover {
  border-color: var(--color-red-dark);
  background: var(--color-red-dark);
  color: var(--color-white);
  text-decoration: none;
}

.site-header__play:hover span[aria-hidden="true"] { transform: translateX(3px); }
.site-header__play span[aria-hidden="true"] { margin-left: 0.25rem; transition: transform var(--transition-fast); }

.site-header__toggle,
.site-header__play--mobile,
.site-header__nav-mobile-only { display: none; }

@media (max-width: 68.75rem) {
  .site-header,
  .site-header__inner { min-height: 4rem; }

  .site-header__inner { gap: 0.75rem; }
  .site-header__mark { flex-basis: 2rem; width: 2rem; height: 2rem; }
  .site-header__brand-name { font-size: 1rem; }
  .site-header__brand-note { display: none; }
  .site-header__nav-list { gap: 0.625rem; }
  .site-header__nav-list a { font-size: 0.75rem; }
  .site-header__play { min-height: 2.5rem; padding-inline: 0.625rem; font-size: 0.6875rem; }
}

@media (max-width: 58rem) {
  .site-header,
  .site-header__inner { min-height: 4rem; }

  .site-header__inner { position: relative; justify-content: space-between; }
  .site-header__brand { margin-right: auto; }
  .site-header__toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 2.75rem;
    min-height: 2.75rem;
    gap: 0.4375rem;
    padding: 0.5rem;
    border: 1px solid var(--color-asphalt-line);
    border-radius: 0;
    background: var(--color-white);
    color: var(--color-ink);
    font-family: var(--font-heading);
    font-size: 0.6875rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    line-height: 1;
    text-transform: uppercase;
  }

  .site-header__toggle:hover,
  .site-header__toggle[aria-expanded="true"] { border-color: var(--color-blue); background: var(--color-blue-pale); color: var(--color-blue-dark); }
  .site-header__toggle-lines { display: grid; width: 1rem; gap: 0.1875rem; }
  .site-header__toggle-lines span { display: block; width: 100%; height: 2px; background: currentColor; transition: transform var(--transition-fast), opacity var(--transition-fast); }
  .site-header__toggle[aria-expanded="true"] .site-header__toggle-lines span:nth-child(1) { transform: translateY(0.3125rem) rotate(45deg); }
  .site-header__toggle[aria-expanded="true"] .site-header__toggle-lines span:nth-child(2) { opacity: 0; }
  .site-header__toggle[aria-expanded="true"] .site-header__toggle-lines span:nth-child(3) { transform: translateY(-0.3125rem) rotate(-45deg); }

  .site-header__play--desktop { display: none; }
  .site-header__nav-mobile-only { display: flex; }
  .site-header__nav {
    position: absolute;
    z-index: 101;
    top: calc(100% + 1px);
    right: 0;
    left: 0;
    display: none;
    max-height: min(31rem, calc(100vh - 4rem));
    overflow-y: auto;
    border: 1px solid var(--color-asphalt-line);
    border-top: 2px solid var(--color-red);
    background: var(--color-white);
    box-shadow: var(--shadow-floating);
  }

  .site-header__nav.is-open { display: block; }
  .site-header__nav-list { display: grid; gap: 0; padding: 0.5rem 1rem; }
  .site-header__nav-list li,
  .site-header__nav-list li + li { border-bottom: var(--border-subtle); }
  .site-header__nav-list li:last-child { border-bottom: 0; }
  .site-header__nav-list a { width: 100%; min-height: 3rem; font-size: 0.875rem; }
  .site-header__nav-list a[aria-current="page"] { box-shadow: inset 2px 0 var(--color-red); }
  .site-header__play--mobile { display: flex; width: calc(100% - 2rem); min-height: 3rem; margin: 0.75rem 1rem 1rem; font-size: 0.875rem; }
}

@media (max-width: 31.25rem) {
  .site-header,
  .site-header__inner { min-height: 3.75rem; }
  .site-header__mark { flex-basis: 1.875rem; width: 1.875rem; height: 1.875rem; }
  .site-header__brand-name { font-size: 1rem; }
  .site-header__toggle-text { display: none; }
  .site-header__toggle { min-width: 2.5rem; }
}

@media (prefers-reduced-motion: reduce) {
  .site-header__play span[aria-hidden="true"],
  .site-header__toggle-lines span { transition: none; }
}