.site-header {
  background: var(--background-panel);
  border-bottom: 1px solid var(--border);
  box-shadow: 0 1px 0 rgba(0, 0, 0, 0.02);
}

.site-header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  max-width: var(--content-max);
  margin: 0 auto;
  padding: var(--header-pad-y) 1.25rem;
}

.brand {
  display: flex;
  flex-direction: column;
  text-decoration: none;
  color: inherit;
  line-height: 1.25;
  min-width: 0;
}

.brand:hover {
  color: inherit;
}

.brand-name {
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.brand-name-en {
  font-size: 0.82rem;
  color: var(--text-sub);
  letter-spacing: 0.03em;
}

.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: var(--radius-ui);
  background: var(--background-panel);
  color: var(--text-main);
}

.nav-toggle-bars {
  display: block;
  width: 1.15rem;
  height: 2px;
  background: currentColor;
  box-shadow: 0 -6px 0 currentColor, 0 6px 0 currentColor;
}

.site-nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0.15rem 1.1rem;
  list-style: none;
}

.site-nav a {
  display: inline-block;
  padding: 0.2rem 0;
  color: var(--text-main);
  text-decoration: none;
  font-size: 0.95rem;
  border-bottom: 2px solid transparent;
  transition: color var(--transition), border-color var(--transition);
}

.site-nav a:hover {
  color: var(--color-primary-dark);
}

.site-nav a.is-active {
  color: var(--color-primary-dark);
  font-weight: 700;
  border-bottom-color: var(--color-primary);
}

.site-main {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 1.75rem 1.25rem 3rem;
  min-height: 55vh;
}

.site-footer {
  border-top: 1px solid var(--border);
  background: var(--background-panel);
  color: var(--text-sub);
  font-size: 0.88rem;
}

.site-footer-inner {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 1.25rem 1.25rem 1.75rem;
}

.site-footer p {
  margin: 0 0 0.2em;
}

@media (max-width: 760px) {
  .nav-toggle {
    display: inline-flex;
  }

  .site-nav {
    display: none;
    width: 100%;
  }

  .site-nav.is-open {
    display: block;
  }

  .site-header-inner {
    flex-wrap: wrap;
  }

  .site-nav ul {
    flex-direction: column;
    gap: 0;
    padding: 0.35rem 0 0.6rem;
    border-top: 1px solid var(--border);
    width: 100%;
  }

  .site-nav a {
    display: block;
    padding: 0.65rem 0.1rem;
    border-bottom: 1px solid var(--border);
  }

  .site-nav a.is-active {
    border-bottom-color: var(--color-primary);
  }
}