.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--gap);
  padding: var(--gap) 16px;
  border-bottom: 1px solid var(--color-border);
  background: var(--color-bg-subtle);
  position: sticky;
  top: 0;
  z-index: 10;
}

.site-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-text);
  text-decoration: none;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 8px;
}

/* button_to 会包一层 form,不消掉它的默认间距按钮会歪 */
.site-nav form {
  margin: 0;
}

.site-main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 16px;
}

.flash {
  margin: 0 0 var(--gap);
  padding: 10px 12px;
  border-radius: var(--radius);
  font-size: 0.9375rem;
}

.flash-notice {
  background: var(--color-success-bg);
  color: var(--color-success-text);
}

.flash-alert {
  background: var(--color-alert-bg);
  color: var(--color-alert-text);
}

.empty-state {
  text-align: center;
  padding: 48px 16px;
  color: var(--color-muted);
}

.empty-state p {
  margin: 0.5rem 0;
}