/* ===== 使用说明页 — 页面专属样式 ===== */

/* ========================================
   主内容区:左右双栏(对齐基因选择页)
   底部沉浸式:main-content 延伸至屏幕底边,内部 right-panel
   通过 padding-bottom 让内容止于 home indicator 之上
   ======================================== */
.main-content {
  display: flex;
  position: fixed;
  top: var(--safe-top);
  bottom: 0;
  left: 0;
  right: 0;
  margin: 0 auto;
  width: 100%;
  max-width: var(--app-width);
  background: var(--color-bg-page);
  padding-top: var(--navbar-height);
}

/* ===== 左面板 ===== */
.left-panel {
  width: 80px;
  flex-shrink: 0;
  background: var(--color-bg-surface);
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

.left-panel::-webkit-scrollbar {
  display: none;
}

.category-item {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  padding: 14px 10px;
  font-size: 14px;
  font-weight: var(--font-medium);
  color: var(--color-text-secondary);
  cursor: pointer;
  position: relative;
  transition: background var(--transition-micro), color var(--transition-micro);
  -webkit-user-select: none;
  user-select: none;
}

.category-item:active {
  background: var(--ios-quaternary-fill);
}

.category-item.active {
  color: var(--color-text-primary);
  font-weight: var(--font-bold);
  background: var(--color-bg-page);
}

.category-item.active::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  height: 52px;
  width: 3px;
  background: var(--color-primary-600);
  border-radius: 0 3px 3px 0;
}

/* ===== 右面板 ===== */
.right-panel {
  flex: 1;
  min-width: 0;
  background: var(--color-bg-page);
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  padding: var(--space-3) var(--space-3) 28px;
}

.right-panel::-webkit-scrollbar {
  display: none;
}

/* Help 页面卡片/列表统一使用 elevated 白色背景 + 12px 圆角(对齐鸿蒙) */
.card,
.list-group {
  background: var(--color-bg-page);
  border-radius: 12px;
}

/* ===== Tab 面板切换 ===== */
.tab-pane {
  display: none;
}

.tab-pane.active {
  display: block;
}

/* 右面板内卡片/列表组之间的间距(列表组本身有 margin-bottom) */
.right-panel .card + .help-section-title,
.right-panel .list-group + .help-section-title {
  margin-top: var(--space-4);
}

/* ========================================
   术语行(label 上 + desc 下,适配窄面板)
   ======================================== */

.term-row {
  flex-direction: column;
  align-items: flex-start;
  justify-content: flex-start;
  gap: 6px;
  min-height: auto;
  padding: 16px;
}

.term-label {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 15px;
  font-weight: var(--font-medium);
  color: var(--color-text-primary);
}

.term-desc {
  font-size: 13px;
  color: var(--color-text-secondary);
  line-height: 20px;
}

/* ========================================
   FAQ 平铺展示（与 App 一致，不可折叠）
   ======================================== */

.faq-item {
  background: transparent;
  padding: 16px;
}

.faq-item + .faq-item {
  border-top: var(--divider-default);
}

.faq-q {
  font-size: 14px;
  font-weight: var(--font-medium);
  color: var(--color-text-primary);
  margin-bottom: var(--space-2);
}

.faq-a {
  font-size: 13px;
  line-height: 20px;
  color: var(--color-text-secondary);
}

/* ========================================
   功能介绍 — 步骤
   ======================================== */

.help-intro-steps {
  margin-top: var(--space-3);
}

.help-step {
  display: flex;
  gap: var(--space-3);
  align-items: flex-start;
  padding: 0;
  margin-bottom: 12px;
}

.help-step:last-child {
  margin-bottom: 0;
}

.help-step-num {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--color-primary-600);
  color: var(--color-text-inverse);
  font-size: 14px;
  font-weight: var(--font-bold);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  margin-top: 2px;
}

.help-step-content {
  flex: 1;
  min-width: 0;
}

.help-step-title {
  font-size: 15px;
  font-weight: var(--font-medium);
  color: var(--color-text-primary);
  margin-bottom: 4px;
}

.help-step-desc {
  font-size: 13px;
  color: var(--color-text-secondary);
  line-height: 20px;
}

/* Help 页面正文统一 14px secondary(对齐鸿蒙) */
.card .text-body {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 22px;
}

/* Help 页面脚注统一 12px tertiary(对齐鸿蒙) */
.card .text-footnote {
  font-size: 12px;
  color: var(--color-text-tertiary);
  line-height: 20px;
}

/* v1.0 不支持声明(强调框) */
.help-unsupported {
  margin-top: var(--space-3);
  padding: var(--space-2) var(--space-3);
  border-left: 3px solid var(--color-warning);
  background: var(--ios-tertiary-grouped);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.5;
}

/* ========================================
   功能介绍 — 卡片子标题
   ======================================== */

.help-section-title {
  font-size: 13px;
  font-weight: var(--font-medium);
  color: var(--color-text-secondary);
  margin-top: var(--space-4);
  margin-bottom: var(--space-2);
  padding-left: 4px;
  padding-top: 4px;
  padding-bottom: 8px;
}

.tab-pane > .help-section-title:first-child,
.tab-pane > .card:first-child + .help-section-title {
  margin-top: var(--space-2);
}

/* ========================================
   预设品系对比
   ======================================== */

.help-compare {
  margin-top: var(--space-3);
  display: flex;
  flex-direction: column;
}

.help-compare-item {
  padding: var(--space-3) 0;
  background: transparent;
  border-bottom: 0.5px solid var(--ios-separator);
}

.help-compare-item:last-child {
  border-bottom: none;
}

.help-compare-label {
  font-size: 14px;
  font-weight: var(--font-medium);
  color: var(--color-primary-600);
  margin-bottom: 4px;
}

.help-compare-desc {
  font-size: 13px;
  color: var(--color-text-secondary);
  line-height: 20px;
}

/* ========================================
   计算结果说明
   ======================================== */

.help-result-items {
  margin-top: var(--space-2);
  display: flex;
  flex-direction: column;
}

.help-result-item {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 6px;
  padding: 10px 0;
  font-size: 13px;
  color: var(--color-text-secondary);
  line-height: 20px;
}

.help-result-item + .help-result-item {
  border-top: 0.5px solid var(--ios-separator);
}

.help-result-badge {
  flex-shrink: 0;
  min-width: auto;
  padding: 3px 8px;
  background: var(--color-primary-50);
  color: var(--color-primary-700);
  border-radius: 6px;
  font-size: 12px;
  font-weight: var(--font-medium);
  text-align: center;
}

.help-result-badge.hot {
  background: var(--color-warning);
  color: var(--color-text-inverse);
}

/* ========================================
   计算示例
   ======================================== */

.help-example-parents {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-top: var(--space-3);
  padding: 4px 0 12px;
  background: transparent;
}

.help-example-parent {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}

.help-example-label {
  font-size: 12px;
  color: var(--color-text-tertiary);
  margin-bottom: 6px;
}

.help-example-genes {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 4px;
}

.help-example-cross {
  font-size: 18px;
  font-weight: var(--font-medium);
  color: var(--color-text-tertiary);
  flex-shrink: 0;
  margin: 0 8px;
}

.help-example-results {
  margin-top: var(--space-3);
  display: flex;
  flex-direction: column;
}

.help-example-result {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--space-2);
  padding: 6px 0;
}

.help-example-pct {
  font-size: 14px;
  font-weight: var(--font-bold);
  color: var(--color-primary-600);
  min-width: 48px;
  flex-shrink: 0;
  font-variant-numeric: tabular-nums;
  margin-top: 1px;
}

.help-example-pheno {
  font-size: 13px;
  font-weight: var(--font-medium);
  color: var(--color-text-primary);
  flex: 1;
  min-width: 0;
}

.help-example-note {
  flex-basis: 100%;
  font-size: 12px;
  color: var(--color-text-tertiary);
  padding-left: calc(48px + var(--space-2));
  margin-top: 2px;
}