.str-header {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  width: 100%;
  background-color: rgba(250, 247, 243, 0.96);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(0, 0, 0, 0.04);
}

.str-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding-top: var(--space-3);
  padding-bottom: var(--space-3);
}

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

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

.str-header__logo-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid var(--gray-200);
  font-family: var(--font-serif);
  font-size: 0.95rem;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.str-header__logo-text {
  display: flex;
  flex-direction: column;
}

.str-header__site-name {
  font-family: var(--font-display);
  font-size: 1rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.str-header__tagline {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

.str-header__nav {
  margin-left: auto;
}

.str-header__nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  list-style: none;
  margin: 0;
  padding: 0;
}

.str-header__nav-link {
  position: relative;
  font-size: var(--font-size-sm);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}

.str-header__nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -0.45rem;
  width: 0;
  height: 1px;
  background-color: var(--color-text);
  transition: width var(--transition-normal);
}

.str-header__nav-link:hover,
.str-header__nav-link:focus-visible {
  color: var(--color-text);
}

.str-header__nav-link:hover::after,
.str-header__nav-link:focus-visible::after {
  width: 100%;
}

.str-header__cta {
  margin-left: var(--space-4);
  flex-shrink: 0;
}

.str-header__cta-btn {
  white-space: nowrap;
}

.str-header__toggle {
  display: none;
  position: relative;
  width: 40px;
  height: 40px;
  border-radius: 999px;
  border: 1px solid var(--gray-200);
  align-items: center;
  justify-content: center;
}

.str-header__toggle-line {
  position: absolute;
  width: 18px;
  height: 1.5px;
  background-color: var(--color-text);
  transition: transform var(--transition-normal), opacity var(--transition-normal), top var(--transition-normal), bottom var(--transition-normal);
}

.str-header__toggle-line:first-child {
  top: 15px;
}

.str-header__toggle-line:last-child {
  bottom: 15px;
}

.str-header__toggle[aria-expanded="true"] .str-header__toggle-line:first-child {
  top: 50%;
  transform: translateY(-50%) rotate(40deg);
}

.str-header__toggle[aria-expanded="true"] .str-header__toggle-line:last-child {
  bottom: 50%;
  transform: translateY(50%) rotate(-40deg);
}

@media (max-width: 900px) {
  .str-header__inner {
    padding-top: var(--space-2);
    padding-bottom: var(--space-2);
  }

  .str-header__toggle {
    display: inline-flex;
    margin-left: auto;
  }

  .str-header__nav {
    position: absolute;
    inset-inline: 0;
    top: 100%;
    background-color: rgba(250, 247, 243, 0.98);
    border-bottom: 1px solid rgba(0, 0, 0, 0.06);
    transform-origin: top;
    transform: scaleY(0.95);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity var(--transition-normal), transform var(--transition-normal), visibility var(--transition-normal);
  }

  .str-header__nav-list {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-2);
    padding: var(--space-4) var(--container-gutter) var(--space-5);
  }

  .str-header__nav-link {
    font-size: var(--font-size-sm);
  }

  .str-header__nav-link::after {
    bottom: -0.2rem;
  }

  .str-header__nav--open {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: scaleY(1);
  }

  .str-header__cta {
    display: none;
  }
}

@media (max-width: 520px) {
  .str-header__logo-mark {
    width: 34px;
    height: 34px;
    font-size: 0.8rem;
  }

  .str-header__site-name {
    font-size: 0.9rem;
  }

  .str-header__tagline {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .str-header,
  .str-header__nav,
  .str-header__toggle-line,
  .str-header__nav-link::after {
    transition: none !important;
  }
}