.site-header {
  position: fixed;
  z-index: 220;
  top: 0;
  right: 0;
  left: 0;
  height: 72px;
  border-bottom: 1px solid rgba(224, 217, 228, 0.76);
  background: rgba(251, 250, 252, 0.88);
  box-shadow: 0 8px 30px rgba(42, 26, 49, 0.035);
  backdrop-filter: blur(20px) saturate(1.3);
  -webkit-backdrop-filter: blur(20px) saturate(1.3);
}

.header-inner {
  display: flex;
  height: 72px;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 3px;
  width: max-content;
}

.brand-mark-image {
  width: 48px;
  height: 48px;
  object-fit: contain;
  filter: drop-shadow(0 7px 14px rgba(126, 42, 189, 0.14));
}

.brand-name {
  color: var(--ink);
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 780;
  line-height: 1;
  letter-spacing: -0.045em;
}

.header-github-button {
  display: inline-flex;
  min-height: 40px;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 0 14px;
  border: 1px solid #28232b;
  border-radius: 10px;
  background: var(--ink);
  box-shadow: 0 8px 22px rgba(23, 20, 25, 0.13), inset 0 1px rgba(255, 255, 255, 0.1);
  color: white;
  font-size: 12px;
  font-weight: 680;
  line-height: 1;
  transition: background 160ms ease, border-color 160ms ease, box-shadow 160ms ease,
    transform 160ms ease;
}

.header-github-button:hover {
  border-color: #403944;
  background: #29242d;
  box-shadow: 0 10px 26px rgba(23, 20, 25, 0.17), inset 0 1px rgba(255, 255, 255, 0.12);
  transform: translateY(-1px);
}

.header-github-button svg {
  width: 17px;
  height: 16px;
  flex: 0 0 auto;
}

@media (max-width: 680px) {
  .site-header,
  .header-inner {
    height: 64px;
  }

  .brand-mark-image {
    width: 44px;
    height: 44px;
  }

  .brand-name {
    font-size: 17px;
  }

  .header-github-button {
    min-height: 38px;
    gap: 7px;
    padding-inline: 12px;
    font-size: 11px;
  }
}

@media (max-width: 360px) {
  .brand-mark-image {
    width: 41px;
    height: 41px;
  }

  .brand-name {
    font-size: 16px;
  }

  .header-github-button {
    min-height: 36px;
    padding-inline: 10px;
    font-size: 10px;
  }
}