.config-form {
  display: grid;
  gap: 12px;
  min-width: 0;
}

.config-form:not(:first-child) {
  margin-top: 10px;
}

.form-group {
  min-width: 0;
}

.form-group + .form-group {
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--pm-border-color);
}

.form-group-heading {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 4px 10px;
  margin-bottom: 10px;
}

.form-group-heading h4 {
  margin: 0;
  color: var(--pm-text-primary);
  font-size: 16px;
  line-height: 1.5;
}

.form-empty {
  margin: 0 0 8px;
  color: var(--pm-text-secondary);
  font-size: 12px;
  line-height: 1.7;
  overflow-wrap: anywhere;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  align-items: start;
  gap: 12px 16px;
}

.form-sections {
  display: none;
}

.form-group[data-group="verification"] .config-field > :deep(.el-switch) {
  align-items: flex-start;
}

/* SSL 路径必须保持整行宽度，避免长路径被多列布局截断。 */
.config-form[data-form-section="ssl"] .form-group[data-group="certificate"] .form-grid {
  grid-template-columns: minmax(0, 1fr);
}

.section-error {
  margin-left: 6px;
  color: var(--el-color-danger);
  font-size: 12px;
}

.config-form[data-form-section="base"] .form-group {
  padding-top: 0;
  border-top: 0;
}

.config-form[data-form-section="base"] .form-group + .form-group {
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--pm-border-color);
}

@container config-main (min-width: 640px) {
  .form-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .config-form[data-form-section="base"] .form-grid,
  .config-form[data-form-section="mail"] .form-grid,
  .config-form[data-form-section="mail_policy"] .form-grid,
  .form-group[data-group="verification"] .form-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* 邮件服务页在桌面抽屉中采用紧凑双列，移除策略后可在常见高度内完整展示。 */
@container config-main (min-width: 360px) {
  .config-form[data-form-section="mail"] {
    gap: 4px;
  }

  .config-form[data-form-section="mail"] .form-grid {
    gap: 5px 12px;
  }

  .config-form[data-form-section="mail"] .form-group + .form-group {
    margin-top: 4px;
    padding-top: 6px;
  }

  .config-form[data-form-section="mail"] .form-group-heading {
    margin-bottom: 2px;
  }

  .config-form[data-form-section="mail"] :deep(.config-field) {
    gap: 2px;
  }

  .config-form[data-form-section="mail"] :deep(.field-label) {
    gap: 4px;
    font-size: 12px;
    line-height: 18px;
    white-space: nowrap;
  }

  .config-form[data-form-section="mail"] :deep(.field-port-guide) {
    min-height: 18px;
    gap: 4px 8px;
    font-size: 11px;
    line-height: 18px;
  }
}

@media (min-width: 769px) and (max-height: 800px) {
  .config-form,
  .form-grid {
    gap: 8px 12px;
  }

  .form-group + .form-group {
    margin-top: 8px;
    padding-top: 8px;
  }

  .config-form[data-form-section="base"] .form-group + .form-group {
    margin-top: 12px;
    padding-top: 12px;
  }
}

@container config-main (max-width: 360px) {
  .form-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 12px;
  }
}

@media (max-width: 768px) {
  .form-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 12px;
  }
}

/* 基础配置的站点字段在桌面半屏抽屉中保持两行两列，窄手机容器回退为单列。 */
@container config-main (min-width: 441px) {
  .form-grid.site-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px 14px;
  }
}