.site-header {
  border-bottom: 1px solid #d1d9e0;
  background: #ffffff;
}

.header-inner {
  max-width: 780px;
  margin: 0 auto;
  padding: 18px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
  font-size: 18px;
  font-weight: 700;
  line-height: 1.2;
  color: #1f2328;
  letter-spacing: -0.01em;
  text-decoration: none;
}
.brand:hover { text-decoration: none; }

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
  font-size: 14px;
  line-height: 1.4;
  color: #57606a;
}
.site-nav a {
  color: #57606a;
  text-decoration: none;
}
.site-nav a:hover {
  color: #0969da;
  text-decoration: underline;
}
.site-nav a[aria-current="page"] {
  color: #1f2328;
  font-weight: 600;
}

.skip {
  position: absolute;
  left: -9999px;
  top: 0;
  background: #0969da;
  color: #ffffff;
  padding: 10px 16px;
  z-index: 10;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
  font-size: 14px;
}
.skip:focus {
  left: 12px;
  top: 12px;
}

.brand:focus-visible,
.site-nav a:focus-visible,
.skip:focus-visible {
  outline: 2px solid #0969da;
  outline-offset: 2px;
}

@media (max-width: 600px) {
  .header-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
    padding: 16px;
  }
}