.site-header {
  position: relative;
  z-index: 100;
  border-bottom: 1px solid var(--color-line-silver);
  background: rgba(247, 249, 252, 0.96);
  backdrop-filter: blur(14px);
}

.site-header__inner {
  display: grid;
  min-height: 5.5rem;
  grid-template-columns: minmax(13rem, 19rem) minmax(0, 1fr) auto;
  align-items: center;
  gap: var(--space-4);
}

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

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

.site-header__logo {
  width: 3.5rem;
  height: 3.5rem;
  flex: 0 0 3.5rem;
  object-fit: contain;
}

.site-header__brand-copy { display: grid; min-width: 0; gap: 0.1rem; }
.site-header__brand-name { font-family: var(--font-heading); font-size: 1.35rem; font-weight: 800; letter-spacing: 0.03em; line-height: 1; white-space: nowrap; }
.site-header__brand-subtitle { color: var(--color-text-muted); font-size: 0.67rem; font-weight: 600; line-height: 1.25; }

.site-header__navigation { min-width: 0; }
.site-header__nav-list { display: flex; min-width: 0; align-items: center; justify-content: center; gap: 0.2rem; margin: 0; padding: 0; list-style: none; }
.site-header__nav-list li, .site-header__nav-list li + li { margin: 0; padding: 0; }
.site-header__nav-list a { display: flex; min-height: 2.75rem; align-items: center; border-bottom: 2px solid transparent; padding: 0.5rem 0.55rem; color: var(--color-graphite); font-size: 0.78rem; font-weight: 700; line-height: 1.15; text-decoration: none; white-space: nowrap; }
.site-header__nav-list a:hover, .site-header__nav-list a:focus-visible { border-bottom-color: var(--color-flame-orange); color: var(--color-graphite); text-decoration: none; }
.site-header__nav-list small { display: none; }
.site-header__mobile-intro, .site-header__menu-cta, .site-header__toggle { display: none; }
.site-header__cta { min-height: 2.75rem; padding-inline: 0.8rem; font-size: 0.76rem; white-space: nowrap; }

@media (max-width: 74rem) {
  .site-header__inner { grid-template-columns: minmax(12rem, 1fr) auto auto; min-height: 4.75rem; }
  .site-header__logo { width: 2.5rem; height: 2.5rem; flex-basis: 2.5rem; }
  .site-header__brand-name { font-size: 1.15rem; }
  .site-header__brand-subtitle, .site-header__cta { display: none; }
  .site-header__toggle { display: inline-grid; width: 2.75rem; height: 2.75rem; place-content: center; gap: 0.28rem; border: 1px solid var(--color-graphite); border-radius: var(--radius-sm); background: var(--color-paper-white); }
  .site-header__toggle-line { display: block; width: 1.25rem; height: 2px; background: var(--color-graphite); transition: transform var(--transition-fast), opacity var(--transition-fast); }
  .site-header__toggle[aria-expanded="true"] .site-header__toggle-line:nth-child(1) { transform: translateY(0.41rem) 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(-0.41rem) rotate(-45deg); }
  .site-header__navigation { position: absolute; top: 100%; right: 0; left: 0; display: none; max-height: calc(100vh - 4.75rem); overflow-y: auto; border-top: 1px solid var(--color-line-silver); border-bottom: 1px solid var(--color-line-silver); background: var(--color-ice-white); padding: var(--space-5) max(var(--container-padding), calc((100% - var(--container-max)) / 2)); box-shadow: var(--shadow-panel); }
  .site-header__navigation.is-open { display: grid; gap: var(--space-5); }
  .site-header__mobile-intro { display: grid; gap: var(--space-1); color: var(--color-text-muted); font-size: var(--text-sm); line-height: 1.35; }
  .site-header__mobile-title { color: var(--color-royal-purple); font-family: var(--font-heading); font-size: 1.5rem; font-weight: 800; letter-spacing: 0.04em; }
  .site-header__nav-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--space-3); }
  .site-header__nav-list a { display: grid; min-height: 5.4rem; align-content: center; gap: var(--space-1); border: 1px solid var(--color-line-silver); border-left: 4px solid var(--color-electric-turquoise); border-bottom-width: 1px; border-radius: var(--radius-card); background: var(--color-paper-white); padding: var(--space-3); white-space: normal; }
  .site-header__nav-list a:hover, .site-header__nav-list a:focus-visible { border-color: var(--color-flame-orange); border-left-color: var(--color-flame-orange); }
  .site-header__nav-list span { font-family: var(--font-heading); font-size: 1.25rem; font-weight: 800; }
  .site-header__nav-list small { display: block; color: var(--color-text-muted); font-size: var(--text-xs); font-weight: 500; }
  .site-header__menu-cta { display: inline-flex; }
}

@media (max-width: 35rem) {
  .site-header__inner { gap: var(--space-2); }
  .site-header__brand-name { font-size: 1rem; }
  .site-header__navigation { padding: var(--space-4); }
  .site-header__nav-list { grid-template-columns: 1fr; }
  .site-header__menu-cta { width: 100%; }
}