/* 新手「写在面包之前」：菜单与栏目阅读均为遮罩 flex 居中；长文区可滚动，「能做到什么」为紧凑小窗。 */

/* ---------- 菜单弹窗 ---------- */
.modal-overlay.pre-intro-menu-overlay {
  align-items: center;
  justify-content: center;
  padding: var(--ui-gap-10);
}

.modal.pre-intro-menu {
  height: auto;
  max-height: min(88vh, 100%);
  flex: 0 0 auto;
}

.modal.pre-intro-menu .modal-body {
  flex: 0 1 auto;
  overflow: visible;
}
.pre-intro-menu-title {
  font-size: var(--ui-fs-15);
  font-weight: normal;
  color: var(--text-primary);
  text-align: center;
  line-height: 1.6;
  margin: 0 0 var(--ui-gap-8);
}

.pre-intro-menu-hint {
  font-size: var(--ui-fs-12);
  color: var(--text-secondary);
  text-align: center;
  line-height: 1.65;
  margin: 0 0 var(--ui-gap-10);
}

.pre-intro-menu-list {
  display: flex;
  flex-direction: column;
  gap: 0;
  border-top: 1px solid var(--border-color);
}

.pre-intro-menu-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--ui-gap-8);
  width: 100%;
  padding: var(--ui-pad-sm-y) 0;
  border: none;
  border-bottom: 1px solid var(--border-color);
  border-radius: 0;
  background: transparent;
  color: var(--text-primary);
  font-size: var(--ui-fs-14);
  font-weight: normal;
  line-height: 1.55;
  text-align: left;
  cursor: pointer;
}
.pre-intro-menu-item:hover,
.pre-intro-menu-item:focus-visible {
  color: var(--accent-color);
  outline: none;
}
.pre-intro-menu-item__mark {
  flex-shrink: 0;
  font-size: var(--ui-fs-12);
  font-weight: normal;
  color: var(--text-secondary);
}

/* ---------- 栏目阅读弹窗（居中卡片，长文可滚动） ---------- */
.modal-overlay.pre-intro-read-overlay {
  align-items: center;
  justify-content: center;
  padding: var(--ui-gap-10);
}

.modal.pre-intro-read {
  display: flex;
  flex-direction: column;
  height: auto;
  max-height: min(82vh, 100%);
  width: 100%;
  flex: 0 0 auto;
}

.modal.pre-intro-read .modal-header {
  flex-shrink: 0;
}

.modal.pre-intro-read .modal-body {
  flex: 1 1 auto;
  min-height: 0;
  overflow-y: auto;
  padding: var(--ui-pad-md-y) var(--ui-pad-md-x);
  -webkit-overflow-scrolling: touch;
}

.modal.pre-intro-read .modal-footer {
  flex-shrink: 0;
}

/* 「能做到什么」：仅一行说明 + 两个演示按钮，高度随内容 */
.modal.pre-intro-read.pre-intro-read--compact {
  max-height: none;
}

.modal.pre-intro-read.pre-intro-read--compact .modal-body {
  flex: 0 1 auto;
  overflow: visible;
}

.pre-intro-read-body {
  font-size: var(--ui-fs-14);
  color: var(--text-primary);
  line-height: 1.75;
}

/* 问答卡：复用 surface-qa，全屏阅读区内微调字重与行距（问题区不加粗） */
.pre-intro-read-body .pre-intro-qa .surface-qa-item {
  margin: var(--ui-gap-10) 0;
}
.pre-intro-read-body .pre-intro-qa .surface-qa-item:first-child {
  margin-top: 0;
}
.pre-intro-read-body .pre-intro-qa .surface-qa-question {
  font-weight: normal;
  line-height: 1.7;
}
.pre-intro-read-body .pre-intro-qa .surface-qa-answer {
  line-height: 1.75;
  white-space: pre-wrap;
}

/* 长文段落 */
.pre-intro-prose {
  margin: 0 0 var(--ui-gap-12);
  font-size: var(--ui-fs-13);
  font-weight: normal;
  color: var(--text-secondary);
  line-height: 1.75;
  white-space: pre-wrap;
}
.pre-intro-prose:last-child {
  margin-bottom: 0;
}

.pre-intro-note {
  margin: 0 0 var(--ui-gap-12);
  padding: var(--ui-pad-md-y) var(--ui-pad-md-x);
  border-left: 2px solid color-mix(in srgb, var(--accent-color) 40%, var(--border-color));
  font-size: var(--ui-fs-13);
  font-weight: normal;
  color: var(--text-secondary);
  line-height: 1.75;
  white-space: pre-wrap;
}

/* 演示按钮区 */
.pre-intro-demo-list {
  display: flex;
  flex-direction: column;
  gap: var(--ui-gap-8);
  margin-top: var(--ui-gap-10);
}

.pre-intro-demo-btn {
  width: 100%;
  padding: var(--ui-pad-md-y) var(--ui-pad-md-x);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background: var(--bg-secondary);
  color: var(--text-primary);
  font-size: var(--ui-fs-13);
  font-weight: normal;
  line-height: 1.55;
  text-align: center;
  cursor: pointer;
}
.pre-intro-demo-btn:hover,
.pre-intro-demo-btn:focus-visible {
  border-color: color-mix(in srgb, var(--accent-color) 35%, var(--border-color));
  outline: none;
}

/* 演示预览期间的「我看好了」按钮。正常挂在 #status-bar 里（跟状态栏的变量展示
   同一个 flex 行，靠右对齐），不悬浮、不遮挡 nav-bar 的设置/故事/编辑器/存读档
   等按钮。只有 #status-bar 不存在这种异常情况才退回 --floating 变体。 */
.pre-intro-preview-fab {
  flex-shrink: 0;
  align-self: center;
  margin-left: auto;
  padding: var(--ui-pad-sm-y) var(--ui-pad-md-x);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background: var(--modal-bg);
  color: var(--text-primary);
  font-size: var(--ui-fs-13);
  font-weight: normal;
  box-shadow: var(--shadow);
  cursor: pointer;
}
.pre-intro-preview-fab:hover,
.pre-intro-preview-fab:focus-visible {
  border-color: color-mix(in srgb, var(--accent-color) 35%, var(--border-color));
  outline: none;
}
/* 退回态：挂在 #app（居中的竖屏整卡）内部，position:absolute 相对 #app 定位，
   不用 fixed——避免宽屏电脑上贴着真实浏览器窗口边缘、和居中的整卡脱节。 */
.pre-intro-preview-fab--floating {
  position: absolute;
  top: max(var(--ui-gap-10), env(safe-area-inset-top, 0px));
  right: max(var(--ui-gap-10), env(safe-area-inset-right, 0px));
  z-index: 8500;
  margin-left: 0;
}