/* =========================================================
   OIWiki Style - Material for MkDocs 主题视觉复刻
   参考: https://oi-wiki.org/ (2026-05-16 实测)
   
   颜色方案: primary=white, accent=red
   字体: Fira Sans + Fira Mono
   ========================================================= */

/* ---------- 变量 ---------- */
:root {
  /* 主色 */
  --oi-primary: #4051b5;
  --oi-primary-light: #5d6cc0;
  --oi-primary-dark: #303fa1;
  --oi-accent: #ff1947;
  --oi-link: #4051b5;
  --oi-link-hover: #ff1947;

  /* 文字 */
  --oi-text: rgba(0,0,0,0.87);
  --oi-text-light: rgba(0,0,0,0.54);
  --oi-text-lighter: rgba(0,0,0,0.32);
  --oi-text-lightest: rgba(0,0,0,0.07);

  /* 背景 */
  --oi-bg: #ffffff;
  --oi-nav-bg: #f1f5f9;
  --oi-code-bg: #f5f5f5;
  --oi-code-fg: #36464e;

  /* 滚动条 */
  scrollbar-width: thin;
  scrollbar-color: #cbd5e1 transparent;

  /* 字体 */
  --oi-font: 'Fira Sans', -apple-system, BlinkMacSystemFont, Helvetica, Arial, sans-serif;
  --oi-code-font: 'Fira Mono', 'SFMono-Regular', Consolas, Menlo, monospace;

  /* 代码高亮 (Atom One Light 风格) */
  --oi-hl-number: #d52a2a;
  --oi-hl-special: #db1457;
  --oi-hl-function: #a846b9;
  --oi-hl-constant: #6e59d9;
  --oi-hl-keyword: #3f6ec6;
  --oi-hl-string: #1c7d4d;
  --oi-hl-comment: var(--oi-text-light);

  /* 阴影 */
  --oi-shadow-z1: 0 0.2rem 0.5rem rgba(0,0,0,0.05), 0 0 0.05rem rgba(0,0,0,0.1);
  --oi-shadow-z2: 0 0.2rem 0.5rem rgba(0,0,0,0.1), 0 0 0.05rem rgba(0,0,0,0.25);
  --oi-shadow-z3: 0 0.2rem 0.5rem rgba(0,0,0,0.2), 0 0 0.05rem rgba(0,0,0,0.35);

  /* 导航 */
  --oi-nav-width: 260px;
  --oi-nav-indent: 1.2rem;

  /* 内容 */
  --oi-content-max-width: 48rem;

  /* 页脚 */
  --oi-footer-bg: rgba(0,0,0,0.87);
  --oi-footer-fg: #ffffff;

  /* 表格 */
  --oi-table-border: rgba(0,0,0,0.12);
  --oi-table-hover: rgba(0,0,0,0.035);
}

/* 深色模式 */
[data-theme="dark"] {
  --oi-primary: #8ab4f8;
  --oi-primary-light: #aecbfa;
  --oi-primary-dark: #669df6;
  --oi-accent: #f28b82;
  --oi-link: #8ab4f8;
  --oi-link-hover: #f28b82;
  --oi-text: rgba(255,255,255,0.87);
  --oi-text-light: rgba(255,255,255,0.54);
  --oi-text-lighter: rgba(255,255,255,0.32);
  --oi-text-lightest: rgba(255,255,255,0.07);
  --oi-bg: #0f172a;
  --oi-nav-bg: #0f172a;
  --oi-code-bg: #1e293b;
  --oi-code-fg: #e2e8f0;
  scrollbar-color: #475569 transparent;
}

/* =========================================================
   整体布局: 左导航 + 右正文
   ========================================================= */
.oi-layout {
  display: flex;
  min-height: 100vh;
  font-family: var(--oi-font);
  color: var(--oi-text);
  background-color: var(--oi-bg);
  line-height: 1.6;
  font-size: 0.8rem;
}

/* ---------- 左侧导航 ---------- */
.oi-nav {
  width: var(--oi-nav-width);
  flex-shrink: 0;
  background: var(--oi-nav-bg);
  overflow-y: auto;
  padding: 1.2rem 0;
  position: sticky;
  top: 0;
  height: 100vh;
  border-right: 1px solid var(--oi-text-lightest);
}

.oi-nav-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 1.2rem 0.8rem;
  font-size: 0.9rem;
  font-weight: 700;
  border-bottom: 1px solid var(--oi-text-lightest);
  margin-bottom: 0.4rem;
}

.oi-nav-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.oi-nav-list ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.oi-nav-item {
  position: relative;
}

.oi-nav-link {
  position: relative;
}

/* 导航链接 */
.oi-nav-link {
  display: block;
  padding: 0.45rem 1.2rem 0.45rem calc(1.2rem + (var(--level, 0) * var(--oi-nav-indent)));
  color: var(--oi-text-light);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 400;
  transition: 0.15s;
  cursor: pointer;
  line-height: 1.5;
  border-left: 3px solid transparent;
}

.oi-nav-link:hover {
  background: rgba(128,128,128,0.08);
  color: var(--oi-text);
}

.oi-nav-link.active {
  color: var(--oi-primary);
  font-weight: 600;
  border-left-color: var(--oi-primary);
  background: rgba(128,128,128,0.08);
}

/* 折叠箭头 */
.oi-nav-toggle {
  background: none;
  border: none;
  padding: 0;
  margin: 0;
  width: 1.2rem;
  height: 1.2rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  cursor: pointer;
  color: var(--oi-text-lighter);
  transition: transform 150ms;
  font-size: 0.75rem;
  position: absolute;
  left: 0.2rem;
  top: 0.45rem;
}

.oi-nav-toggle.expanded {
  transform: rotate(90deg);
}

.oi-nav-toggle.hidden {
  visibility: hidden;
}

/* 导航子列表 (可折叠) */
.oi-nav-children {
  overflow: hidden;
  max-height: 0;
  transition: max-height 200ms ease;
}

.oi-nav-children.open {
  max-height: 2000px;
}

/* ---------- 右侧正文 ---------- */
.oi-content {
  flex: 1;
  max-width: var(--oi-content-max-width);
  padding: 1.2rem 2.0rem;
  min-width: 0;
}

/* ---------- 顶栏（搜索 + 导航面包屑） ---------- */
.oi-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.4rem 0;
  margin-bottom: 1rem;
  border-bottom: 1px solid var(--oi-text-lightest);
}

.oi-breadcrumb {
  font-size: 0.7rem;
  color: var(--oi-text-light);
}

.oi-breadcrumb a {
  color: var(--oi-primary);
  text-decoration: none;
}

.oi-breadcrumb a:hover {
  text-decoration: underline;
}

/* 搜索框 */
.oi-search {
  position: relative;
}

.oi-search-input {
  background: var(--oi-nav-bg);
  border: none;
  border-radius: 0.1rem;
  padding: 0.3rem 0.6rem 0.3rem 2rem;
  font-family: var(--oi-font);
  font-size: 0.7rem;
  width: 12rem;
  transition: width 200ms, background 200ms;
}

.oi-search-input:focus {
  width: 16rem;
  background: rgba(0,0,0,0.07);
  outline: none;
}

.oi-search-icon {
  position: absolute;
  left: 0.4rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--oi-text-light);
  font-size: 0.8rem;
  pointer-events: none;
}

/* =========================================================
   正文排版 (md-typeset 复刻)
   ========================================================= */
.oi-typeset {
  font-size: 0.8rem;
  line-height: 1.6;
  word-wrap: break-word;
}

.oi-typeset h1 {
  color: var(--oi-text-light);
  font-size: 2em;
  font-weight: 300;
  line-height: 1.3;
  margin: 0 0 1.25em;
  letter-spacing: -0.01em;
}

.oi-typeset h2 {
  font-size: 1.5625em;
  font-weight: 300;
  line-height: 1.4;
  margin: 1.6em 0 0.64em;
  letter-spacing: -0.01em;
  border-bottom: 1px solid var(--oi-text-lightest);
  padding-bottom: 0.2em;
}

.oi-typeset h3 {
  font-size: 1.25em;
  font-weight: 400;
  line-height: 1.5;
  margin: 1.6em 0 0.8em;
  letter-spacing: -0.01em;
}

.oi-typeset h2 + h3 {
  margin-top: 0.8em;
}

.oi-typeset h4 {
  font-weight: 700;
  letter-spacing: -0.01em;
  margin: 1em 0;
}

.oi-typeset h5,
.oi-typeset h6 {
  color: var(--oi-text-light);
  font-size: 0.8em;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin: 1.25em 0;
}

.oi-typeset h5 {
  text-transform: uppercase;
}

.oi-typeset p {
  margin: 1em 0;
}

.oi-typeset a {
  color: var(--oi-link);
  word-break: break-word;
  text-decoration: none;
  transition: color 125ms;
}

.oi-typeset a:hover,
.oi-typeset a:focus {
  color: var(--oi-link-hover);
}

.oi-typeset hr {
  border: none;
  border-bottom: 0.05rem solid var(--oi-text-lightest);
  margin: 1.5em 0;
}

/* ---------- 代码 ---------- */
.oi-typeset code {
  background-color: var(--oi-code-bg);
  border-radius: 0.1rem;
  font-size: 0.85em;
  padding: 0 0.2941176471em;
  word-break: break-word;
  font-family: var(--oi-code-font);
  color: var(--oi-code-fg);
}

.oi-typeset pre {
  display: flow-root;
  line-height: 1.4;
  position: relative;
  margin: 1em 0;
}

.oi-typeset pre > code {
  display: block;
  padding: 0.7720588235em 1.1764705882em;
  overflow: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--oi-text-lighter) transparent;
  word-break: normal;
  box-shadow: none;
  background-color: var(--oi-code-bg);
  border-radius: 0.1rem;
}

.oi-typeset pre > code::-webkit-scrollbar {
  height: 0.2rem;
  width: 0.2rem;
}

.oi-typeset pre > code::-webkit-scrollbar-thumb {
  background-color: var(--oi-text-lighter);
}

/* 代码复制按钮 */
.oi-copy-btn {
  position: absolute;
  top: 0.4rem;
  right: 0.4rem;
  background: rgba(0,0,0,0.07);
  border: none;
  border-radius: 0.1rem;
  padding: 0.2rem 0.4rem;
  font-size: 0.6rem;
  color: var(--oi-text-light);
  cursor: pointer;
  opacity: 0;
  transition: opacity 125ms;
}

.oi-typeset pre:hover .oi-copy-btn {
  opacity: 1;
}

/* ---------- 代码高亮 ---------- */
.hljs-keyword { color: var(--oi-hl-keyword); }
.hljs-string { color: var(--oi-hl-string); }
.hljs-number { color: var(--oi-hl-number); }
.hljs-function { color: var(--oi-hl-function); }
.hljs-constant { color: var(--oi-hl-constant); }
.hljs-comment { color: var(--oi-hl-comment); font-style: italic; }
.hljs-built_in { color: var(--oi-hl-constant); }

/* ---------- 引用 ---------- */
.oi-typeset blockquote {
  color: var(--oi-text-light);
  margin: 1em 0;
  padding-left: 0.6rem;
  border-left: 0.2rem solid var(--oi-text-lighter);
}

/* ---------- 列表 ---------- */
.oi-typeset ul,
.oi-typeset ol {
  padding: 0;
  margin: 1em 0;
}

.oi-typeset li {
  margin-left: 1.25em;
  margin-bottom: 0.5em;
}

.oi-typeset li:last-child {
  margin-bottom: 0;
}

/* ---------- 表格 ---------- */
.oi-typeset table {
  background-color: var(--oi-bg);
  border: 0.05rem solid var(--oi-table-border);
  border-radius: 0.1rem;
  display: inline-block;
  max-width: 100%;
  overflow: auto;
  font-size: 0.64rem;
  margin: 1em 0;
}

.oi-typeset table th {
  font-weight: 700;
  min-width: 5rem;
  padding: 0.9375em 1.25em;
  vertical-align: top;
  text-align: left;
}

.oi-typeset table td {
  border-top: 0.05rem solid var(--oi-table-border);
  padding: 0.9375em 1.25em;
  vertical-align: top;
}

.oi-typeset table tbody tr:hover {
  background-color: var(--oi-table-hover);
  box-shadow: 0 0.05rem 0 var(--oi-bg) inset;
}

/* ---------- 图片 ---------- */
.oi-typeset img {
  max-width: 100%;
  height: auto;
}

/* =========================================================
   可折叠信息块 (Admonitions)
   ========================================================= */
.oi-admonition {
  margin: 1em 0;
  padding: 0 0.6rem 0.8rem;
  border-left: 0.2rem solid;
  border-radius: 0.1rem;
  background: rgba(0,0,0,0.02);
  font-size: 0.7rem;
}

.oi-admonition summary {
  display: flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.5rem 0;
  font-weight: 600;
  cursor: pointer;
  font-size: 0.7rem;
}

.oi-admonition summary::-webkit-details-marker {
  display: none;
}

.oi-admonition summary::before {
  content: "▶";
  font-size: 0.6rem;
  transition: transform 150ms;
  color: var(--oi-text-light);
}

.oi-admonition[open] summary::before {
  transform: rotate(90deg);
}

/* 类型: note (蓝色) */
.oi-admonition.note {
  border-left-color: #448aff;
  background: rgba(68,138,255,0.05);
}
.oi-admonition.note summary { color: #448aff; }

/* 类型: warning (橙色) */
.oi-admonition.warning {
  border-left-color: #ff9100;
  background: rgba(255,145,0,0.05);
}
.oi-admonition.warning summary { color: #ff9100; }

/* 类型: danger (红色) */
.oi-admonition.danger {
  border-left-color: #ff1744;
  background: rgba(255,23,68,0.05);
}
.oi-admonition.danger summary { color: #ff1744; }

/* 类型: info (浅蓝) */
.oi-admonition.info {
  border-left-color: #00b0ff;
  background: rgba(0,176,255,0.05);
}
.oi-admonition.info summary { color: #00b0ff; }

/* 类型: tip (绿色) */
.oi-admonition.tip {
  border-left-color: #00bfa5;
  background: rgba(0,191,165,0.05);
}
.oi-admonition.tip summary { color: #00bfa5; }

/* 类型: abstract/question/example (青色/紫) */
.oi-admonition.abstract {
  border-left-color: #00bcd4;
  background: rgba(0,188,212,0.05);
}
.oi-admonition.abstract summary { color: #00bcd4; }

.oi-admonition.question {
  border-left-color: #4caf50;
  background: rgba(76,175,80,0.05);
}
.oi-admonition.question summary { color: #4caf50; }

.oi-admonition.example {
  border-left-color: #7c4dff;
  background: rgba(124,77,255,0.05);
}
.oi-admonition.example summary { color: #7c4dff; }

/* =========================================================
   底部页脚
   ========================================================= */
.oi-footer {
  margin-top: 2rem;
  border-top: 1px solid var(--oi-text-lightest);
  padding: 0.8rem 0;
  text-align: center;
  font-size: 0.64rem;
  color: var(--oi-text-light);
}

.oi-footer a {
  color: var(--oi-primary);
  text-decoration: none;
}

/* ---------- 页面底部元信息 (贡献者/时间/版权) ---------- */
.oi-page-meta {
  margin: 2em 0 1em;
  border-top: 1px solid var(--oi-text-lightest);
  padding-top: 1em;
}

.oi-page-meta blockquote {
  margin: 0.5em 0;
  padding: 0.3em 0.6em;
  border-left: 0.2rem solid #64b5f6;
  font-size: 0.7rem;
  color: var(--oi-text-light);
  background: none;
}

.oi-page-meta blockquote.copyright {
  border-left-color: #ff1700;
}

.oi-page-meta blockquote a {
  color: var(--oi-primary);
  text-decoration: none;
}

.oi-page-meta blockquote a:hover {
  text-decoration: underline;
}

.oi-contributor-list a {
  color: var(--oi-text-light);
  text-decoration: none;
}

.oi-contributor-list a:hover {
  color: var(--oi-primary);
}

/* =========================================================
   数学公式 (KaTeX)
   ========================================================= */
.oi-typeset .katex {
  font-size: 1em;
}

/* =========================================================
   LYM 动画嵌入
   ========================================================= */
.oi-lym-container {
  margin: 1em 0;
  border: 1px solid var(--oi-text-lightest);
  border-radius: 0.2rem;
  overflow: hidden;
}

.oi-lym-container .lym-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.3rem 0.6rem;
  background: var(--oi-nav-bg);
  border-bottom: 1px solid var(--oi-text-lightest);
  font-size: 0.7rem;
  font-family: var(--oi-code-font);
}

.oi-lym-container .lym-header .lym-run-btn {
  background: var(--oi-primary);
  color: #fff;
  border: none;
  border-radius: 0.1rem;
  padding: 0.15rem 0.5rem;
  cursor: pointer;
  font-size: 0.6rem;
}

.oi-lym-container .lym-header .lym-run-btn:hover {
  background: var(--oi-primary-dark);
}

.oi-lym-container .lym-canvas {
  display: block;
  width: 100%;
  background: #fafafa;
}

/* =========================================================
   移动端适配
   ========================================================= */
/* -------- 1220px 以下：导航固定叠层 + 菜单按钮显示 -------- */
@media (max-width: 1220px) {
  .oi-mobile-menu-btn { display: inline-block !important; }
  .oi-mobile-title { display: inline; }

  .oi-nav {
    position: fixed;
    left: -260px;
    z-index: 100;
    transition: left 200ms;
    border-right: none;
    box-shadow: var(--oi-shadow-z2);
  }

  .oi-nav.open {
    left: 0;
  }

  .oi-nav-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,0.3);
    z-index: 99;
    display: none;
  }

  .oi-nav-overlay.visible {
    display: block;
  }

  .oi-content {
    padding: 1rem 1.2rem;
  }

  .oi-search-input {
    width: 8rem;
  }

  .oi-search-input:focus {
    width: 10rem;
  }
}

.oi-nav-close {
  background: none;
  border: none;
  font-size: 18px;
  cursor: pointer;
  padding: 0 4px;
  color: var(--oi-text-lighter);
  line-height: 1;
  display: inline-block;
}

/* -------- 640px 以下：导航变顶部横条 -------- */
@media (max-width: 760px) {
  .oi-layout { flex-direction: column; }
  .oi-topbar { display: none; }

  .oi-nav {
    width: 100%;
    height: auto;
    max-height: 240px;
    position: relative;
    border-right: none;
    border-bottom: 1px solid var(--oi-text-lightest);
    overflow-y: auto;
    transform: none;
    left: auto;
    transition: none;
    box-shadow: none;
    padding: 0.8rem 0;
  }
  .oi-nav.open { transform: none; left: auto; }
  .oi-nav-overlay { display: none !important; }
  .oi-nav-close { display: none; }

  .oi-content {
    padding: 1rem;
  }

  .oi-search-input {
    width: 6rem;
  }
  .oi-search-input:focus {
    width: 8rem;
  }
}