/* ============================================================
   一人公司·从 0 到 1 — Mobile-First 重排样式
   仅在 (max-width: 768px) 下加载，桌面体验完全不受影响。
   原则：
     1. 内容大于装饰 — 一切非阅读元素让位
     2. 拇指可达 — 主要操作放在屏幕底部 1/3
     3. 单列流 — 不再尝试横向并排
     4. 大点击区 — 所有可交互元素 ≥ 44×44px (Apple HIG)
     5. 安全区适配 — 兼容 iOS notch / 全面屏底部 home 横条
   ============================================================ */

/* ============================================================
   1. 基础排版 mobile-first
   ============================================================ */
html {
  scroll-padding-top: 60px;
}
body {
  font-size: 16.5px;       /* 比桌面略小，避免一行字数过少 */
  line-height: 1.78;
  /* 兼容刘海屏：左右内容自动避开 notch */
  padding-left: env(safe-area-inset-left);
  padding-right: env(safe-area-inset-right);
}
html[data-fontsize="s"]  body { font-size: 14.5px; }
html[data-fontsize="m"]  body { font-size: 16.5px; }
html[data-fontsize="l"]  body { font-size: 18px; }
html[data-fontsize="xl"] body { font-size: 19.5px; line-height: 1.85; }

p {
  font-size: 1rem;
  margin: 0.85em 0;
  /* 中文长字符串折行更优雅 */
  word-break: break-word;
  line-break: normal;
  hanging-punctuation: allow-end;
}

/* 段落里行内 footnote 上标 — 更圆、更易点 */
p > a[title] {
  font-size: 0.78em;
  padding: 1px 7px;
  margin: 0 1px;
  vertical-align: super;
}

/* ============================================================
   2. Topbar — 缩小、只保留 brand + ☰ 一个动作
   ============================================================ */
.topbar {
  /* 半透明玻璃感保留，但变薄 */
  border-bottom: 1px solid var(--divider);
}
.topbar__inner {
  padding: 8px 14px;
  gap: 10px;
  /* 兼容刘海屏 */
  padding-top: max(8px, env(safe-area-inset-top));
}
.topbar__brand {
  font-size: 0.92rem;
  /* 只显示 logo + 简化标题 */
  gap: 8px;
}
.topbar__brand span:not(.topbar__logo) {
  display: inline;
  max-width: 60vw;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.topbar__logo {
  width: 28px;
  height: 28px;
  border-radius: 7px;
}
.topbar__logo-cell {
  font-size: 9.5px;
}

/* 在 mobile 下只在 topbar 留 1 个"目录"按钮，
   其它操作 (搜索/主题/顶部) 都移到底部工具栏 */
.topbar__chip,
.topbar__divider,
#searchTrigger,
#settingsTrigger,
.topbar a.icon-btn[aria-label="GitHub 仓库"] {
  display: none !important;
}
.topbar__actions {
  gap: 4px;
}
#tocToggle {
  width: 40px;
  height: 40px;
}

/* 设置弹层在 mobile 上变成底部抽屉 */
.menu {
  position: fixed;
  left: 12px;
  right: 12px;
  top: auto;
  bottom: calc(76px + env(safe-area-inset-bottom));
  min-width: 0;
  border-radius: 18px;
  padding: 14px;
  z-index: 95;
}
.menu[data-open="true"] {
  transform: translateY(0);
}
.menu:not([data-open="true"]) {
  transform: translateY(20px);
}

/* ============================================================
   3. 主体两栏 → 单栏
   ============================================================ */
.page {
  grid-template-columns: 1fr;
  gap: 0;
  padding: 12px 12px calc(96px + env(safe-area-inset-bottom));
}
.main {
  padding: 22px 18px 30px;
  border-radius: 12px;
  border-left: none;
  border-right: none;
  margin-left: -12px;
  margin-right: -12px;
  box-shadow: none;
}
.main::before {
  /* mobile 上隐藏背景渐变 — 节省 GPU + 减少视觉噪音 */
  display: none;
}

/* ============================================================
   4. Hero — 紧凑、垂直、大字钩子
   ============================================================ */
.hero {
  padding: 26px 18px 22px;
  border-radius: 14px;
  margin-bottom: 22px;
}
.hero::after {
  width: 200px;
  height: 200px;
  right: -50px;
  top: -50px;
}
.hero__badges {
  gap: 6px;
  margin-bottom: 12px;
}
.hero__badge {
  font-size: 0.68rem;
  padding: 3px 8px;
}
.hero__title {
  font-size: clamp(1.55rem, 7vw, 2.2rem);
  line-height: 1.22;
  margin-bottom: 10px;
  letter-spacing: -0.01em;
}
.hero__subtitle {
  font-size: 0.95rem;
  line-height: 1.65;
  margin-bottom: 16px;
}
.hero__author {
  font-size: 0.82rem;
  line-height: 1.6;
}
.hero__author--meta {
  font-size: 0.7rem;
}
.hero__meta {
  /* 4 项数据 → 2 列 2 行，密度更高 */
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-top: 18px;
}
.hero__stat {
  padding: 12px 14px;
  border-radius: 10px;
}
.hero__stat-num {
  font-size: 1.3rem;
}
.hero__stat-label {
  font-size: 0.72rem;
}

/* ============================================================
   5. 学习地图 — 单列大卡片，每张都更显眼
   ============================================================ */
.chapter-map {
  margin: 28px 0 16px;
}
.chapter-map__head h2 {
  font-size: 1.2rem;
}
.chapter-map__head p {
  font-size: 0.85rem;
}
.chapter-grid {
  grid-template-columns: 1fr;
  gap: 10px;
}
.chapter-card {
  padding: 16px 16px 16px 18px;
  border-radius: 12px;
  /* 移动端永远默认提升一点，给手指更明确的点击反馈 */
  transition: background 0.15s, border-color 0.15s, transform 0.1s;
}
.chapter-card:active {
  transform: scale(0.98);
  background: color-mix(in srgb, var(--band, var(--accent)) 8%, var(--paper-elevated));
}
.chapter-card__num {
  font-size: 0.7rem;
}
.chapter-card__title {
  font-size: 1rem;
}
.chapter-card__desc {
  font-size: 0.85rem;
  line-height: 1.55;
}

/* ============================================================
   6. 标题排版 — mobile 字阶
   ============================================================ */
h1 {
  font-size: 1.55rem;
  padding-bottom: 0.3em;
}
h2 {
  font-size: 1.25rem;
  padding: 4px 0 4px 12px;
}
h3 {
  font-size: 1.08rem;
  padding-left: 10px;
}
h4 {
  font-size: 1rem;
}
.chapter-section > .chapter-h2 {
  padding: 12px 14px;
  font-size: 1.2rem;
}
.chapter-section > .chapter-h2::before {
  font-size: 0.66rem;
  letter-spacing: 0.14em;
}

/* 锚点复制按钮 mobile 默认显示但更小 */
.heading-anchor {
  opacity: 0.4;
  margin-left: 4px;
  padding: 6px;  /* 大点击区 */
}
.heading-anchor svg {
  width: 12px;
  height: 12px;
}

/* ============================================================
   7. 引文 / 列表 / 分隔线
   ============================================================ */
blockquote {
  margin: 1.1em -4px;
  padding: 14px 16px 14px 18px;
  border-radius: 0 10px 10px 0;
  font-size: 0.96rem;
}
blockquote::before {
  font-size: 1.8rem;
  top: -16px;
  left: 8px;
}
hr {
  margin: 1.6em 0;
}

/* ============================================================
   8. 表格 → label/value 卡片化（mobile 杀器）
   每个 td 用 data-label 显示来源列名
   ============================================================ */
.table-wrap {
  overflow: visible;            /* 不再横向滚动 */
  border: none;
  background: transparent;
  box-shadow: none;
  border-radius: 0;
  margin: 1.1em 0 1.4em;
}
.table-wrap table {
  display: block;
  font-size: 0.9rem;
}
.table-wrap thead {
  /* 表头视觉留作"分组标题"备用，但默认隐藏 */
  display: none;
}
.table-wrap tbody {
  display: block;
}
.table-wrap tbody tr {
  display: block;
  background: var(--paper-elevated);
  border: 1px solid var(--line);
  border-left: 4px solid var(--accent);
  border-radius: 12px;
  padding: 12px 14px;
  margin-bottom: 10px;
  box-shadow: var(--shadow-sm);
}
.table-wrap tbody tr:nth-child(even) td {
  background: transparent;        /* 取消斑马纹（卡片化后不需要） */
}
.table-wrap tbody tr:hover td {
  background: transparent;
}
.table-wrap tbody td {
  display: block;
  padding: 6px 0;
  border: none;
  border-bottom: 1px dashed var(--divider);
  font-size: 0.92rem;
  line-height: 1.6;
}
.table-wrap tbody td:last-child {
  border-bottom: none;
  padding-bottom: 0;
}
.table-wrap tbody td:first-child {
  padding-top: 0;
}
/* data-label 由 JS 在 mobile 下注入 */
.table-wrap tbody td[data-label]::before {
  content: attr(data-label);
  display: block;
  font-family: "Inter", "PingFang SC", sans-serif;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-strong);
  margin-bottom: 4px;
  opacity: 0.85;
}

/* ============================================================
   9. TL;DR 卡片 — mobile 紧凑
   ============================================================ */
.tldr-card {
  padding: 18px 18px 16px;
  margin: 18px 0 22px;
  border-radius: 14px;
}
.tldr-card::after {
  width: 100px;
  height: 100px;
  top: -30px;
  right: -30px;
}
.tldr-card__head {
  gap: 10px;
  margin-bottom: 12px;
}
.tldr-card__icon {
  flex: 0 0 30px;
  width: 30px;
  height: 30px;
  font-size: 0.95rem;
}
.tldr-card__eyebrow {
  font-size: 0.66rem;
}
.tldr-card__title {
  font-size: 0.96rem;
  line-height: 1.4;
}
.tldr-card__list li {
  font-size: 0.92rem;
  padding: 8px 0;
}
.tldr-card__bullet {
  flex: 0 0 22px;
  width: 22px;
  height: 22px;
  font-size: 0.72rem;
}
.tldr-card__foot {
  font-size: 0.76rem;
  margin-top: 10px;
  padding-top: 10px;
}

/* ============================================================
   10. 章末上下章导航 — 单列大按钮
   ============================================================ */
.chapter-nav {
  grid-template-columns: 1fr;
  gap: 8px;
  margin: 28px 0 8px;
  padding-top: 18px;
}
.chapter-nav__btn {
  padding: 14px 16px;
  border-radius: 12px;
  text-align: center !important;
  align-items: center !important;
  flex-direction: row !important;
  justify-content: center;
  gap: 10px;
  min-height: 56px;
}
.chapter-nav__btn--map { order: 0; }
.chapter-nav__btn--prev { order: -1; }
.chapter-nav__btn--next { order: 1; }
.chapter-nav__dir {
  font-size: 0.7rem;
  letter-spacing: 0.06em;
}
.chapter-nav__title {
  font-size: 0.88rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  flex: 1;
  text-align: left;
}

/* ============================================================
   11. 教训卡 / 工具栈卡 / 日程卡 / 学习小组卡 / 关于作者卡
   ============================================================ */
.lesson-card {
  padding: 14px 16px;
  margin: 14px 0;
  border-radius: 12px;
}
.lesson-card__head {
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 8px;
}
.lesson-card__num {
  font-size: 0.66rem;
  padding: 3px 8px;
}
.lesson-card__title {
  font-size: 0.96rem;
  line-height: 1.45;
  flex-basis: 100%;
}
.lesson-card__scene {
  font-size: 0.92rem;
  line-height: 1.7;
}
.lesson-card__rule {
  padding: 10px 12px;
  font-size: 0.88rem;
}

.stack-grid {
  grid-template-columns: 1fr;
  gap: 10px;
}
.stack-card {
  padding: 12px 14px;
  border-radius: 10px;
}
.stack-card__role {
  font-size: 0.68rem;
}
.stack-card__name {
  font-size: 0.96rem;
}
.stack-card__why {
  font-size: 0.82rem;
}
.stack-card__alt {
  font-size: 0.74rem;
}

.day-list li {
  flex-direction: column;
  padding: 12px 14px;
  gap: 8px;
}
.day-list .day-num {
  flex: none;
  font-size: 1.1rem;
  border-right: none;
  border-bottom: 1px solid var(--line);
  padding: 0 0 6px;
  width: 100%;
  justify-content: flex-start;
}
.day-list .day-title {
  font-size: 0.95rem;
}
.day-list .day-detail {
  font-size: 0.86rem;
}
.day-list .day-checklist li {
  font-size: 0.72rem;
  padding: 3px 8px;
}

/* 关于作者 */
.about-card {
  padding: 22px 18px 16px;
  border-radius: 14px;
}
.about-card__head {
  flex-direction: column;
  align-items: flex-start;
  gap: 12px;
  padding-bottom: 16px;
  margin-bottom: 16px;
}
.about-card__avatar {
  flex: 0 0 56px;
  width: 56px;
  height: 56px;
  border-radius: 14px;
  font-size: 1.6rem;
}
.about-card__name {
  font-size: 1.4rem;
}
.about-card__role {
  font-size: 0.88rem;
}
.about-card__chip {
  font-size: 0.68rem;
  padding: 3px 8px;
}
.about-card__quote {
  margin: 14px 0;
  padding: 12px 14px;
  font-size: 0.92rem;
}

/* 学习小组 4 卡 → 1 列大按钮 */
.join-grid {
  grid-template-columns: 1fr;
  gap: 10px;
  margin: 16px 0;
}
.join-card {
  flex-direction: row;
  align-items: center;
  gap: 14px;
  padding: 14px 16px;
  min-height: 64px;
}
.join-card__icon {
  font-size: 1.65rem;
  flex: 0 0 32px;
}
.join-card__title {
  font-size: 0.98rem;
  margin-top: 0;
}
.join-card__desc {
  font-size: 0.78rem;
  line-height: 1.45;
}

.about-credo {
  font-size: 0.92rem;
  padding: 14px 16px;
}

/* ============================================================
   12. SVG 图 / 代码块 / 图片
   ============================================================ */
figure.diagram {
  padding: 14px 12px 10px;
  margin: 22px -4px 26px;
  border-radius: 12px;
}
figure.diagram svg {
  /* 给图一个最小高度，避免某些图被压成"扁条" */
  min-height: 200px;
}
figure.diagram figcaption {
  font-size: 0.78rem;
  padding-top: 10px;
  margin-top: 10px;
}
figure.diagram figcaption b {
  font-size: 0.72rem;
  margin-right: 6px;
}

pre {
  margin: 1.1em -8px;
  padding: 14px 16px;
  border-radius: 10px;
  font-size: 0.78rem;
  line-height: 1.65;
}
pre code {
  /* 移动端代码不强制 break-word，让它自然横滑 */
  white-space: pre;
}
.code-copy {
  /* mobile 上始终显示，因为没有 hover */
  opacity: 0.85;
  font-size: 0.7rem;
  padding: 4px 9px;
}

img {
  margin: 16px auto 22px;
  border-radius: 8px;
}

/* ============================================================
   13. 提示框 (callout)
   ============================================================ */
.callout {
  padding: 12px 14px;
  margin: 14px 0;
  gap: 10px;
}
.callout__icon {
  flex: 0 0 24px;
  height: 24px;
  font-size: 0.78rem;
  border-radius: 6px;
}
.callout__body {
  font-size: 0.88rem;
  line-height: 1.65;
}

/* ============================================================
   14. 侧边目录抽屉 — 更宽 + 更易关闭
   ============================================================ */
.sidebar {
  width: 88vw;
  max-width: 360px;
  padding: 8px;
  /* 兼容刘海 */
  padding-top: env(safe-area-inset-top);
  padding-left: env(safe-area-inset-left);
}
.sidebar__inner {
  padding: 16px 8px 12px 16px;
  border-radius: 14px;
}
.sidebar__list a {
  padding: 10px 12px;
  font-size: 0.92rem;
  /* 拇指可达 */
  min-height: 44px;
  display: flex;
  align-items: center;
}
.sidebar__list .lvl-3 {
  padding-left: 26px;
  font-size: 0.84rem;
  min-height: 40px;
}

/* ============================================================
   15. 底部固定工具栏 (mobile 专属)
   桌面没有这个元素，由 JS 在 mobile 下注入
   ============================================================ */
.mobile-fab {
  position: fixed;
  left: 12px;
  right: 12px;
  bottom: calc(12px + env(safe-area-inset-bottom));
  z-index: 88;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 6px;
  padding: 8px;
  background: color-mix(in srgb, var(--paper-elevated) 92%, transparent);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border: 1px solid var(--line);
  border-radius: 20px;
  box-shadow: var(--shadow-lg);
  transform: translateY(0);
  transition: transform 0.28s cubic-bezier(0.22, 0.61, 0.36, 1),
    opacity 0.2s ease;
  opacity: 1;
}
.mobile-fab.is-hidden {
  transform: translateY(calc(100% + env(safe-area-inset-bottom) + 24px));
  opacity: 0;
  pointer-events: none;
}
.mobile-fab__btn {
  appearance: none;
  background: transparent;
  border: none;
  color: var(--ink-soft);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 3px;
  padding: 8px 0 6px;
  border-radius: 14px;
  cursor: pointer;
  font-family: "Inter", "PingFang SC", "Microsoft YaHei", sans-serif;
  min-height: 56px;
  -webkit-tap-highlight-color: transparent;
  transition: background 0.15s, color 0.15s, transform 0.1s;
}
.mobile-fab__btn:active {
  transform: scale(0.94);
  background: var(--accent-fade);
  color: var(--accent);
}
.mobile-fab__btn svg {
  width: 22px;
  height: 22px;
  stroke-width: 1.8;
}
.mobile-fab__label {
  font-size: 0.66rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  line-height: 1;
}

/* 原桌面"回到顶部"在 mobile 下被工具栏中的"顶部"按钮替代 */
.back-to-top {
  display: none !important;
}

/* ============================================================
   16. 搜索弹层 — 全屏式更适合手机
   ============================================================ */
.search-modal {
  padding-top: 0;
  align-items: stretch;
}
.search-box {
  width: 100%;
  max-width: none;
  margin: 0;
  border-radius: 0;
  border: none;
  height: 100vh;
  max-height: 100vh;
  padding: 8px 10px 16px;
  padding-top: max(8px, env(safe-area-inset-top));
  padding-bottom: max(16px, env(safe-area-inset-bottom));
}
.search-box__input {
  font-size: 1.05rem;
  padding: 14px 4px;
}

/* ============================================================
   17. 页脚 — 紧凑、不占点击区
   ============================================================ */
.site-footer {
  margin-top: 36px;
  padding: 22px 18px 16px;
  font-size: 0.78rem;
  /* 给底部工具栏让位 */
  padding-bottom: calc(96px + env(safe-area-inset-bottom));
}

/* ============================================================
   18. 阅读进度条 — 略微加粗
   ============================================================ */
.reading-progress {
  height: 3.5px;
}

/* ============================================================
   19. 长按选择文本时不要被工具栏覆盖
   ============================================================ */
::selection {
  background: var(--selection-bg);
}

/* ============================================================
   20. 减弱动效（mobile 上 GPU 资源更宝贵）
   ============================================================ */
@media (prefers-reduced-motion: no-preference) {
  .fade-in {
    transition-duration: 0.25s;
  }
}

/* ============================================================
   AI 划词解释 — mobile 适配
   ============================================================ */

/* 小气泡：mobile 上更大的点击区，永远显示在选区下方避免被系统菜单挡住 */
.ai-bubble {
  font-size: 0.92rem;
  padding: 10px 16px 10px 14px;
  gap: 8px;
}
.ai-bubble svg {
  width: 16px;
  height: 16px;
}
.ai-bubble__kbd {
  /* mobile 不显示快捷键 */
  display: none;
}

/* 右侧面板 → 全屏底部抽屉（更适合手机） */
.ai-panel {
  width: 100vw;
  max-width: 100vw;
  height: 100dvh;
  border-left: none;
  border-radius: 0;
  transform: translateY(100%);
  box-shadow: 0 -16px 40px rgba(20, 14, 0, 0.2);
  /* iOS 安全区 */
  padding-top: env(safe-area-inset-top);
}
.ai-panel.is-open {
  transform: translateY(0);
}
.ai-panel__head {
  padding: 14px 16px 12px;
}
.ai-panel__title {
  font-size: 1.05rem;
}
.ai-panel__quote {
  margin: 12px 16px 0;
  font-size: 0.84rem;
  max-height: 80px;
}
.ai-panel__body {
  padding: 14px 18px 18px;
  font-size: 0.96rem;
  line-height: 1.78;
}
.ai-panel__foot {
  padding: 10px 14px max(10px, env(safe-area-inset-bottom));
  flex-wrap: wrap;
  gap: 6px;
}
.ai-panel__action {
  font-size: 0.78rem;
  padding: 7px 11px;
}
.ai-panel__byok-hint {
  font-size: 0.72rem;
  margin-left: auto;
  flex-basis: auto;
}

/* BYOK 表单在手机上更紧凑 */
.menu__byok-row {
  flex-wrap: wrap;
}
.menu__byok-input {
  font-size: 0.82rem;
}
.menu__byok-btn {
  font-size: 0.78rem;
  min-height: 36px;
}

/* 当 AI 面板打开时，移动端工具栏让位（避免 z-index 重叠） */
body:has(.ai-panel.is-open) .mobile-fab,
body:has(.ai-stash.is-open) .mobile-fab {
  transform: translateY(calc(100% + env(safe-area-inset-bottom) + 24px)) !important;
  opacity: 0;
  pointer-events: none;
}

/* ============================================================
   知识柜 — mobile 适配
   ============================================================ */

/* 小尖头：避开右下角 mobile-fab，挪到屏幕中部偏上 */
.ai-stash-handle {
  top: 38%;
  bottom: auto;
  padding: 10px 4px 10px 7px;
  border-radius: 12px 0 0 12px;
}
.ai-stash-handle__label {
  /* mobile 上文字让位, 只保留箭头 + 数量徽章 */
  display: none;
}
.ai-stash-handle__count {
  font-size: 0.62rem;
  min-width: 18px;
}

/* 抽屉 → 全屏底部抽屉（与 ai-panel 对齐） */
.ai-stash {
  width: 100vw;
  max-width: 100vw;
  height: 100dvh;
  border-left: none;
  border-radius: 0;
  transform: translateY(100%);
  box-shadow: 0 -16px 40px rgba(20, 14, 0, 0.2);
  padding-top: env(safe-area-inset-top);
}
.ai-stash.is-open {
  transform: translateY(0);
}
.ai-stash__head {
  padding: 14px 16px 10px;
}
.ai-stash__title {
  font-size: 1.05rem;
}
.ai-stash__toolbar {
  padding: 8px 14px 4px;
}
.ai-stash__list {
  padding: 6px 14px 16px;
}

/* mobile 上抽屉打开时藏起小尖头 (底部抽屉占满屏幕了, 留它没意义) */
body:has(.ai-stash.is-open) .ai-stash-handle {
  opacity: 0;
  pointer-events: none;
}

/* ============================================================
   21. iPad / 大屏 mobile 兼容（>540 但 ≤768）
   ============================================================ */
@media (min-width: 540px) and (max-width: 768px) {
  .chapter-grid {
    grid-template-columns: 1fr 1fr;
  }
  .stack-grid {
    grid-template-columns: 1fr 1fr;
  }
  .join-grid {
    grid-template-columns: 1fr 1fr;
  }
  .hero__meta {
    grid-template-columns: repeat(4, 1fr);
  }
}