.zupzup-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid var(--line, #d6d1c5);
  background: rgba(247, 244, 234, 0.92);
  backdrop-filter: blur(12px);
}

.zupzup-header .zupzup-header-inner {
  width: min(calc(100% - 48px), 1180px);
  min-height: 68px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.zupzup-header .zupzup-brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  color: var(--ink, #1a1814);
  font-weight: 850;
  letter-spacing: -0.04em;
  text-decoration: none;
}

.zupzup-header .zupzup-brand-mark {
  width: 34px;
  height: 34px;
  flex: 0 0 auto;
  display: grid;
  place-items: center;
  border: 1.5px solid var(--ink, #1a1814);
  border-radius: 9px;
  background: var(--lime, #c7ff38);
  font: 700 14px/1 var(--mono, monospace);
  transform: skewX(-10deg);
}

.zupzup-header .zupzup-brand-copy {
  display: grid;
  gap: 2px;
  white-space: nowrap;
}

.zupzup-header .zupzup-brand-name {
  color: var(--ink, #1a1814);
  font-size: 14px;
  line-height: 1.15;
}

.zupzup-header .zupzup-brand-sub {
  color: var(--muted, #666158);
  font: 700 9px/1 var(--mono, monospace);
  letter-spacing: 0.12em;
}

.zupzup-header .zupzup-nav {
  display: flex;
  align-items: center;
  gap: 21px;
}

.zupzup-header .zupzup-nav a {
  color: var(--muted, #666158);
  font-size: 12px;
  font-weight: 700;
  line-height: 1.2;
  text-decoration: none;
  white-space: nowrap;
}

.zupzup-header .zupzup-nav a:hover,
.zupzup-header .zupzup-nav a:focus-visible {
  color: var(--ink, #1a1814);
  text-decoration: underline;
  text-decoration-color: var(--lime, #c7ff38);
  text-decoration-thickness: 2px;
  text-underline-offset: 5px;
}

.zupzup-header .zupzup-nav .nav-primary {
  padding: 7px 11px;
  border: 1px solid var(--ink, #1a1814);
  border-radius: 999px;
  color: var(--ink, #1a1814);
  background: var(--lime, #c7ff38);
}

.zupzup-header .zupzup-nav a[aria-current='page'] {
  color: var(--ink, #1a1814);
  text-decoration: underline;
  text-decoration-color: var(--ink, #1a1814);
  text-decoration-thickness: 2px;
  text-underline-offset: 5px;
}

.zupzup-header .zupzup-nav .language {
  min-width: 38px;
  min-height: 34px;
  padding: 0 9px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line, #d6d1c5);
  border-radius: 999px;
  color: var(--ink, #1a1814);
  background: var(--surface, #fffdf8);
  font: 700 10px/1 var(--mono, monospace);
}

@media (max-width: 720px) {
  .zupzup-header .zupzup-header-inner {
    width: calc(100% - 28px);
    min-height: 62px;
    gap: 12px;
  }

  .zupzup-header .zupzup-nav {
    gap: 9px;
  }

  .zupzup-header .zupzup-nav a:not(.nav-primary):not(.language) {
    display: none;
  }
}

@media (max-width: 440px) {
  .zupzup-header .zupzup-brand-copy {
    display: none;
  }
}