* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: var(--font-body, var(--font-mono));
  background-color: var(--bg);
  color: var(--text);
  transition: background-color 0.3s ease, color 0.3s ease;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 32px;
  background: var(--nav-bg);
  position: sticky;
  top: 0;
  z-index: 10;
  flex-wrap: wrap;
  gap: 12px;
}

.site-logo {
  font-family: var(--font-display);
  font-size: 1.4rem;
  text-decoration: none;
  color: var(--text);
}

.site-nav {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}

.site-nav a {
  text-decoration: none;
  color: var(--color-link);
  font-family: var(--font-display);
  font-size: 0.95rem;
  padding: 6px 4px;
  border-bottom: 2px solid transparent;
  transition: border-color 0.2s ease, color 0.2s ease;
}

.site-nav a:hover,
.site-nav a.active {
  color: var(--color-link-hover);
  border-bottom-color: var(--color-link-hover);
}

#theme-toggle {
  background: none;
  border: 2px solid var(--color-primary);
  border-radius: 999px;
  width: 40px;
  height: 40px;
  font-size: 1.1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.2s ease;
}

#theme-toggle:hover {
  transform: scale(1.08);
}

.site-main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 32px 24px 64px;
  min-height: 60vh;
}

.site-footer {
  text-align: center;
  padding: 24px;
  font-size: 0.85rem;
  opacity: 0.7;
}

@media (max-width: 600px) {
  .site-header {
    flex-direction: column;
    align-items: flex-start;
  }
  .site-nav {
    width: 100%;
    justify-content: space-between;
  }
}