/* Violet C语言教程 - 布局：头部、导航、主内容、页脚 */
.site-header {
  background: var(--color-primary);
  color: #fff;
  padding: var(--space-md) var(--space-lg);
  box-shadow: 0 2px 6px rgba(0,0,0,0.1);
}
.site-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: #fff;
}
.site-title:hover { color: #e0d4f0; text-decoration: none; }

.site-nav {
  background: var(--color-bg-content);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-sm) var(--space-lg);
  position: relative;
}
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 10px;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  background: var(--color-bg-content);
  cursor: pointer;
  color: var(--color-text);
}
.nav-toggle-bar {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-text);
  border-radius: 1px;
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) {
  opacity: 0;
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}
.nav-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs) var(--space-lg);
}
.nav-list a {
  color: var(--color-text);
  padding: var(--space-xs) var(--space-sm);
  border-radius: 4px;
}
.nav-list a:hover { background: #eee; text-decoration: none; color: var(--color-primary); }
.nav-list a.current {
  background: var(--color-primary);
  color: #fff;
  font-weight: 600;
}
.nav-list a.current:hover { color: #fff; }

.content {
  max-width: var(--content-max-width);
  margin: 0 auto;
  padding: var(--space-xl) var(--space-lg);
  background: var(--color-bg-content);
  min-height: 60vh;
  box-shadow: 0 0 0 1px var(--color-border);
}

.site-footer {
  text-align: center;
  padding: var(--space-lg);
  color: var(--color-text-muted);
  font-size: 0.9rem;
  border-top: 1px solid var(--color-border);
  background: var(--color-bg-content);
}
.site-footer p { margin: 0; }

.template-error { color: #c00; font-size: 0.9rem; }