/* ============================================================
   pi-atelier 开源书 — 自定义样式
   ============================================================
   注意：mdBook 0.4.x 版本给 HTML id 加了 mdbook- 前缀
   （如 #mdbook-menu-bar, #mdbook-sidebar），但 index.hbs
   中使用的是无前缀的 id（#menu-bar, #sidebar）。
   因此这里必须用无前缀选择器来补充 mdBook 默认样式。
   ============================================================ */

/* ── CSS 变量覆盖（rust 主题基础上微调） ── */
:root {
  /* 字体 */
  --font-body: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', 'Open Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'Source Code Pro', 'Cascadia Code', 'JetBrains Mono', Consolas, 'Ubuntu Mono', Menlo, monospace;

  /* 导航栏高度 */
  --menu-bar-height: 50px;

  /* 侧边栏（用 min 动态公式，resize 拖动时 JS 会改 --sidebar-target-width） */
  --sidebar-target-width: 300px;
  --sidebar-width: min(var(--sidebar-target-width), 80vw);

  /* 内容区 */
  --content-max-width: 860px;

  /* 滚动条 */
  --scrollbar: #c1c1c1;
  --sidebar-active: #e85d04;
}

/* ── 全局字体 ── */
html {
  font-family: var(--font-body);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
}

code, pre, kbd, samp {
  font-family: var(--font-mono);
}

/* ============================================================
   关键修复：菜单栏 sticky + z-index
   mdBook 默认用 #mdbook-menu-bar，但我们的 id 是 #menu-bar
   ============================================================ */

/* 菜单栏占位符 — 让内容不被 sticky 菜单栏遮挡 */
#menu-bar-hover-placeholder {
  height: var(--menu-bar-height);
}

/* 菜单栏 sticky 定位 */
#menu-bar.sticky,
#menu-bar-hover-placeholder:hover + #menu-bar,
#menu-bar:hover {
  position: -webkit-sticky;
  position: sticky;
  top: 0 !important;
  z-index: 100;
}

/* 侧边栏已恢复，内容在 index.hbs 的 <nav id="sidebar"> 中生成 */
/* nav-wide-wrapper 导航按钮也已恢复 */

/* 内容区也需要留出菜单栏空间 */
#page-wrapper {
  padding-top: 0;
}

/* ============================================================
   顶部导航栏美化
   ============================================================ */
.menu-bar {
  border-bottom: 1px solid var(--table-border-color);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  background: rgba(255, 255, 255, 0.88);
  height: var(--menu-bar-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px;
}

html.ayu .menu-bar {
  background: rgba(21, 21, 33, 0.88);
}

html.coal .menu-bar,
html.navy .menu-bar {
  background: rgba(27, 27, 27, 0.88);
}

.menu-bar .left-buttons {
  display: flex;
  align-items: center;
  gap: 4px;
}

.menu-bar .right-buttons {
  display: flex;
  align-items: center;
  gap: 8px;
}

.menu-bar .icon-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 8px;
  border: none;
  background: transparent;
  color: var(--fg);
  cursor: pointer;
  transition: background 0.2s, transform 0.15s;
}

.menu-bar .icon-button:hover {
  background: var(--sidebar-spacer);
  transform: scale(1.05);
}

/* SVG 图标确保可见 */
.menu-bar .fa-svg {
  display: inline-flex;
  align-items: center;
  line-height: var(--menu-bar-height);
}

.menu-bar .fa-svg svg {
  width: 1em;
  height: 1em;
  fill: currentColor;
}

.menu-title {
  font-weight: 600;
  letter-spacing: 0.3px;
  font-size: 1.1em;
  color: var(--fg);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* 主题弹出菜单 */
.theme-popup {
  border-radius: 8px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
  border: 1px solid var(--table-border-color);
  overflow: hidden;
}

.theme-popup li {
  margin: 0;
}

.theme-popup button {
  width: 100%;
  padding: 10px 20px;
  border: none;
  background: transparent;
  text-align: left;
  cursor: pointer;
  transition: background 0.15s;
}

.theme-popup button:hover {
  background: var(--sidebar-spacer);
}

/* 搜索栏 */
#searchbar {
  border-radius: 8px;
  border: 1px solid var(--searchbar-border-color);
  padding: 10px 14px;
  font-size: 0.9em;
  transition: all 0.2s;
  font-family: var(--font-body);
}

#searchbar:focus {
  outline: none;
  border-color: var(--links);
  box-shadow: 0 0 0 3px rgba(232, 93, 4, 0.15);
}

/* ============================================================
   侧边栏美化
   ============================================================ */
.sidebar {
  border-right: 1px solid var(--table-border-color);
  background: var(--sidebar-bg);
  width: var(--sidebar-width);
  transition: transform 0.2s ease;
}

.sidebar .sidebar-scrollbox {
  padding: 12px 0;
  overflow-y: auto;
}

.sidebar .chapter {
  padding: 6px 16px;
  border-radius: 6px;
  margin: 2px 8px;
  transition: all 0.2s ease;
  font-size: 0.9em;
  line-height: 1.5;
  color: var(--sidebar-fg);
  text-decoration: none;
  display: block;
}

.sidebar .chapter:hover {
  background: var(--sidebar-spacer);
  transform: translateX(2px);
}

.sidebar .chapter.active {
  background: var(--sidebar-active);
  color: #fff;
  font-weight: 500;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.15);
}

.sidebar .section {
  padding: 4px 16px 4px 24px;
  border-radius: 4px;
  margin: 1px 8px;
  font-size: 0.85em;
  color: var(--sidebar-fg);
  text-decoration: none;
  display: block;
}

.sidebar .section:hover {
  background: var(--sidebar-spacer);
}

.sidebar .part-title {
  font-weight: 700;
  font-size: 0.8em;
  padding: 20px 16px 6px;
  color: var(--sidebar-fg);
  opacity: 0.5;
  text-transform: uppercase;
  letter-spacing: 1px;
}

/* ============================================================
   主内容区布局
   ============================================================ */
.content main {
  max-width: var(--content-max-width);
  padding: 0 2em;
}

/* ============================================================
   底部章节导航条
   ============================================================ */
.nav-wrapper {
  margin-top: 3em;
  padding-top: 1.5em;
  border-top: 1px solid var(--table-border-color);
}

.nav-chapters {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: 8px;
  background: var(--sidebar-bg);
  color: var(--sidebar-fg);
  text-decoration: none;
  font-size: 0.9em;
  font-weight: 500;
  transition: all 0.25s ease;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
}

.nav-chapters:hover {
  background: var(--sidebar-active);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.nav-chapters .nav-label {
  display: inline;
}

.nav-chapters.previous::before {
  content: "← ";
}

.nav-chapters.next::after {
  content: " →";
}

/* ============================================================
   代码块美化
   ============================================================ */
pre {
  border-radius: 10px;
  padding: 1em 1.2em;
  margin: 1.5em 0;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
  border: 1px solid var(--table-border-color);
  overflow-x: auto;
  position: relative;
  line-height: 1.7;
  tab-size: 2;
}

pre code {
  font-size: 0.875em;
  line-height: 1.7;
  border-radius: 0;
  padding: 0;
  background: transparent !important;
}

/* 行内代码 */
:not(pre) > code {
  background: var(--quote-bg);
  padding: 2px 7px;
  border-radius: 5px;
  font-size: 0.85em;
  color: var(--inline-code-color);
  border: 1px solid var(--quote-border);
  font-weight: 500;
}

/* 代码语言标签 */
.code-lang-label {
  position: absolute;
  top: 0;
  right: 0;
  padding: 3px 12px;
  font-size: 0.7em;
  font-weight: 600;
  color: var(--fg);
  background: var(--table-header-bg);
  border-radius: 0 10px 0 6px;
  opacity: 0.7;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  pointer-events: none;
}

/* 复制按钮美化 */
pre .buttons {
  position: absolute;
  top: 4px;
  right: 4px;
  display: flex;
  gap: 4px;
  opacity: 0;
  transition: opacity 0.2s;
}

pre:hover .buttons {
  opacity: 1;
}

pre .buttons button {
  background: var(--table-header-bg);
  border: 1px solid var(--table-border-color);
  border-radius: 6px;
  padding: 4px 8px;
  font-size: 0.75em;
  color: var(--fg);
  cursor: pointer;
  transition: background 0.2s;
}

pre .buttons button:hover {
  background: var(--sidebar-spacer);
}

/* ============================================================
   表格美化
   ============================================================ */
table {
  border-collapse: separate;
  border-spacing: 0;
  border-radius: 10px;
  overflow: hidden;
  border: 1px solid var(--table-border-color);
  margin: 1.5em 0;
  width: 100%;
  font-size: 0.92em;
}

thead {
  background: var(--table-header-bg);
}

th {
  font-weight: 600;
  color: var(--fg);
  padding: 12px 18px;
  text-align: left;
  font-size: 0.9em;
}

td {
  padding: 10px 18px;
  border-top: 1px solid var(--table-border-color);
}

tbody tr:nth-child(even) {
  background: var(--table-alternate-bg);
}

tbody tr:hover {
  background: var(--quote-bg);
  transition: background 0.2s;
}

/* ============================================================
   引用块美化
   ============================================================ */
blockquote {
  border-left: 4px solid var(--links);
  border-radius: 0 8px 8px 0;
  padding: 14px 22px;
  margin: 1.5em 0;
  background: var(--quote-bg);
  font-style: normal;
}

blockquote p {
  margin: 0;
}

/* ============================================================
   自定义提示框
   ============================================================ */
.pain-point {
  background: #fff8e1;
  border-left: 4px solid #ff9800;
  padding: 16px 22px;
  margin: 1.5em 0;
  border-radius: 0 10px 10px 0;
  color: #e65100;
  box-shadow: 0 1px 4px rgba(255, 152, 0, 0.1);
}

.pain-point::before {
  content: "🤔 ";
  font-weight: 700;
}

.solution {
  background: #e8f5e9;
  border-left: 4px solid #4caf50;
  padding: 16px 22px;
  margin: 1.5em 0;
  border-radius: 0 10px 10px 0;
  color: #1b5e20;
  box-shadow: 0 1px 4px rgba(76, 175, 80, 0.1);
}

.solution::before {
  content: "✅ ";
  font-weight: 700;
}

.tip {
  background: #e3f2fd;
  border-left: 4px solid #2196f3;
  padding: 16px 22px;
  margin: 1.5em 0;
  border-radius: 0 10px 10px 0;
  color: #0d47a1;
  box-shadow: 0 1px 4px rgba(33, 150, 243, 0.1);
}

.tip::before {
  content: "💡 ";
  font-weight: 700;
}

.warning {
  background: #fbe9e7;
  border-left: 4px solid #f44336;
  padding: 16px 22px;
  margin: 1.5em 0;
  border-radius: 0 10px 10px 0;
  color: #b71c1c;
  box-shadow: 0 1px 4px rgba(244, 67, 54, 0.1);
}

.warning::before {
  content: "⚠️ ";
  font-weight: 700;
}

/* ============================================================
   链接样式
   ============================================================ */
.content a {
  color: var(--links);
  text-decoration: none;
  border-bottom: 1px dashed var(--links);
  transition: all 0.2s ease;
}

.content a:hover {
  border-bottom-style: solid;
  color: var(--sidebar-active);
}

/* ============================================================
   标题层级
   ============================================================ */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  color: var(--fg);
}

h1 {
  font-size: 2em;
  margin-top: 0;
  letter-spacing: -0.3px;
}

h2 {
  font-size: 1.5em;
  border-bottom: 2px solid var(--table-border-color);
  padding-bottom: 0.3em;
  margin-top: 2em;
}

h3 {
  font-size: 1.25em;
  margin-top: 1.5em;
}

/* ============================================================
   页脚 — 最后更新时间
   ============================================================ */
.page-footer {
  margin-top: 3em;
  padding-top: 1em;
  border-top: 1px solid var(--table-border-color);
  text-align: right;
  font-size: 0.8em;
  color: var(--fg);
  opacity: 0.5;
}

/* 导航文字标签 */
.nav-text {
  font-size: 0.9em;
  font-weight: 500;
}

/* ============================================================
   滚动条美化（Webkit）
   ============================================================ */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--scrollbar);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--sidebar-active);
}

/* ============================================================
   首页 Hero 区域
   ============================================================ */
.hero {
  text-align: center;
  padding: 2em 0;
  margin-bottom: 2em;
}

.hero h1 {
  font-size: 2.8em;
  margin-bottom: 0.3em;
  background: linear-gradient(135deg, #e85d04, #dc2f02);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero .subtitle {
  font-size: 1.2em;
  opacity: 0.7;
  margin-bottom: 1.5em;
}

.hero .badges img {
  margin: 0 4px;
  vertical-align: middle;
}

/* ============================================================
   卡片样式（首页特性展示）
   ============================================================ */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.2em;
  margin: 1.5em 0;
}

.feature-card {
  padding: 1.2em;
  border-radius: 10px;
  border: 1px solid var(--table-border-color);
  background: var(--quote-bg);
  transition: all 0.2s ease;
}

.feature-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.feature-card h4 {
  margin: 0 0 0.5em;
  font-size: 1em;
}

.feature-card p {
  margin: 0;
  font-size: 0.88em;
  opacity: 0.8;
}

/* ============================================================
   图片美化
   ============================================================ */
.content img {
  max-width: 100%;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
  margin: 1em 0;
}

/* ============================================================
   移动端适配
   ============================================================ */
@media only screen and (max-width: 768px) {
  :root {
    --sidebar-target-width: 260px;
    --sidebar-width: min(var(--sidebar-target-width), 80vw);
  }

  .nav-chapters {
    padding: 10px 16px;
    font-size: 0.85em;
  }

  h1 { font-size: 1.6em; }
  h2 { font-size: 1.3em; }

  table { font-size: 0.85em; }
  th, td { padding: 8px 10px; }

  .feature-grid {
    grid-template-columns: 1fr;
  }

  .hero h1 {
    font-size: 2em;
  }

  .content main {
    padding: 0 1em;
  }

  .menu-title {
    font-size: 0.95em;
  }
}

/* ============================================================
   打印优化
   ============================================================ */
@media print {
  .nav-chapters, .sidebar, #searchbar, #menu-bar,
  .page-footer, #sidebar-toggle, .theme-popup {
    display: none !important;
  }

  .content {
    max-width: 100%;
  }

  pre {
    box-shadow: none;
    border: 1px solid #ddd;
  }
}

/* === 底部导航标签 === */
.nav-wrapper .nav-chapters {
  display: inline-flex;
  align-items: center;
  padding: 10px 20px;
  border-radius: 8px;
  background: var(--sidebar-bg);
  color: var(--sidebar-fg);
  text-decoration: none;
  font-size: 0.9em;
  font-weight: 500;
  transition: all 0.2s ease;
  max-width: 45%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.nav-wrapper .nav-chapters:hover {
  background: var(--sidebar-active);
  color: var(--sidebar-fg);
  transform: translateY(-1px);
  box-shadow: 0 2px 8px rgba(0,0,0,0.15);
}

.nav-wrapper .nav-chapters.previous {
  float: left;
}

.nav-wrapper .nav-chapters.next {
  float: right;
}

.nav-label {
  pointer-events: none;
}

/* === 页脚最后更新 === */
.page-footer {
  margin-top: 2em;
  padding-top: 1em;
  border-top: 1px solid var(--table-border-color);
  color: var(--fg-muted);
  font-size: 0.85em;
  text-align: center;
}