/* 笔记网站的样式。由 tools/build_site.py 原样复制到 site/assets/。不引用任何外部字体或图片。 */
:root {
  --bg: #ffffff;
  --fg: #1f2328;
  --muted: #59636e;
  --line: #d1d9e0;
  --accent: #0969da;
  --panel: #f6f8fa;
  --code-bg: #f6f8fa;
  --code-fg: #1f2328;
  --must: #cf222e;
  --top-height: 52px;
}
@media screen and (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1117;
    --fg: #e6edf3;
    --muted: #9198a1;
    --line: #3d444d;
    --accent: #4493f8;
    --panel: #151b23;
    --code-bg: #151b23;
    --code-fg: #e6edf3;
    --must: #ff7b72;
  }
}

* { box-sizing: border-box; }
/* 脚本用 hidden 属性收起东西；下面给 #chapters 等写了 display，不加这一条就收不起来 */
[hidden] { display: none !important; }
html { -webkit-text-size-adjust: 100%; scroll-padding-top: calc(var(--top-height) + 12px); }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.75 -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", "Segoe UI", sans-serif;
  overflow-wrap: break-word;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* 顶栏 */
header.top {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--top-height);
  padding: 0 20px;
  background: var(--bg);
  border-bottom: 1px solid var(--line);
}
header.top .brand { font-weight: 700; font-size: 17px; color: var(--fg); }
header.top .home-link { font-size: 14px; }

/* 章节页：左边目录，右边正文 */
.layout {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  gap: 36px;
  max-width: 1180px;
  margin: 0 auto;
  padding: 20px;
}
.layout > main { min-width: 0; }
.layout > main:only-child { grid-column: 1 / -1; max-width: 860px; margin: 0 auto; width: 100%; }
.toc {
  position: sticky;
  top: calc(var(--top-height) + 16px);
  align-self: start;
  max-height: calc(100vh - var(--top-height) - 32px);
  overflow-y: auto;
  font-size: 14px;
  line-height: 1.5;
}
.toc summary { cursor: pointer; font-weight: 700; padding: 4px 0; color: var(--muted); }
.toc ul { list-style: none; margin: 6px 0 0; padding: 0; }
.toc li { margin: 0; }
.toc li a { display: block; padding: 4px 8px; border-radius: 6px; color: var(--fg); }
.toc li a:hover { background: var(--panel); text-decoration: none; }
.toc li.l3 a { padding-left: 22px; color: var(--muted); font-size: 13px; }

/* 正文 */
.note h1 { font-size: 28px; line-height: 1.3; margin: 8px 0 20px; }
.note h2 { font-size: 21px; line-height: 1.4; margin: 44px 0 14px; padding-bottom: 6px; border-bottom: 1px solid var(--line); }
.note h3 { font-size: 17px; margin: 28px 0 10px; }
.note p { margin: 12px 0; }
.note ul, .note ol { padding-left: 1.5em; margin: 12px 0; }
.note li { margin: 4px 0; }
.note li.task-list-item { list-style: none; margin-left: -1.4em; }
.note li.task-list-item input { margin: 0 8px 0 0; width: 16px; height: 16px; vertical-align: -2px; }
.note blockquote { margin: 14px 0; padding: 2px 14px; border-left: 4px solid var(--line); color: var(--muted); }
.note hr { border: 0; border-top: 1px solid var(--line); margin: 28px 0; }
code {
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  font-size: 0.9em;
  padding: 0.12em 0.35em;
  border-radius: 4px;
  background: var(--panel);
}

/* 代码块：顶上留出一行放语言名和“复制”按钮，按钮就不会盖住第一行代码 */
.code { position: relative; margin: 14px 0; }
.code[data-lang]::before {
  content: attr(data-lang);
  position: absolute;
  top: 8px;
  left: 16px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--muted);
}
.code pre {
  margin: 0;
  padding: 36px 16px 14px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  background: var(--code-bg);
  color: var(--code-fg);
  border: 1px solid var(--line);
  border-radius: 8px;
  line-height: 1.55;
  tab-size: 4;
}
.code pre code { padding: 0; background: none; font-size: 13.5px; white-space: pre; }
.code .copy {
  position: absolute;
  top: 6px;
  right: 6px;
  padding: 2px 10px;
  font: inherit;
  font-size: 12px;
  line-height: 1.6;
  color: var(--muted);
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 6px;
  cursor: pointer;
  opacity: 0.75;
}
.code .copy:hover, .code .copy:focus { opacity: 1; color: var(--fg); }

/* 表格：窄屏上可以横着滑 */
.table-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; margin: 14px 0; }
table { border-collapse: collapse; font-size: 15px; line-height: 1.6; }
th, td { border: 1px solid var(--line); padding: 6px 12px; text-align: left; vertical-align: top; }
th { background: var(--panel); white-space: nowrap; }

/* 上一章、下一章 */
.pager { display: flex; justify-content: space-between; gap: 12px; margin: 48px 0 8px; }
.pager a {
  flex: 1 1 0;
  max-width: 48%;
  padding: 10px 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--fg);
}
.pager a:hover { border-color: var(--accent); text-decoration: none; }
.pager a span { display: block; font-size: 12px; color: var(--muted); }
.pager a.next { margin-left: auto; text-align: right; }

/* 首页 */
.home { max-width: 1100px; margin: 0 auto; padding: 20px; }
.home h1 { font-size: 30px; margin: 12px 0 6px; }
.home .lead { color: var(--muted); margin: 0 0 18px; }
.search input {
  width: 100%;
  padding: 10px 14px;
  font: inherit;
  color: var(--fg);
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 8px;
}
.search input:focus { outline: 2px solid var(--accent); outline-offset: -1px; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin: 10px 0 0; }
.chip {
  padding: 3px 12px;
  font: inherit;
  font-size: 13px;
  color: var(--fg);
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 999px;
  cursor: pointer;
}
.chip:hover { border-color: var(--accent); }
.chip[aria-pressed="true"] { color: var(--bg); background: var(--accent); border-color: var(--accent); }
#results { list-style: none; margin: 18px 0 0; padding: 0; }
#results li { padding: 8px 2px; border-bottom: 1px solid var(--line); }
#results li span { display: block; font-size: 13px; color: var(--muted); }
#results li.none { color: var(--muted); border: 0; }
#results li.count { padding-top: 0; font-size: 13px; color: var(--muted); }
#chapters { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 16px; margin: 22px 0 0; }
.chapter { padding: 12px 16px 14px; border: 1px solid var(--line); border-radius: 10px; }
.chapter h2 { font-size: 17px; margin: 0 0 6px; }
.chapter ul { list-style: none; margin: 0; padding: 0; font-size: 14px; line-height: 1.5; }
.chapter li { padding: 3px 0; }
.chapter li a { color: var(--fg); }
.chapter li a:hover { color: var(--accent); }

footer {
  max-width: 1180px;
  margin: 40px auto 0;
  padding: 16px 20px 28px;
  border-top: 1px solid var(--line);
  font-size: 12px;
  color: var(--muted);
}

/* 手机 */
@media (max-width: 899px) {
  .layout { display: block; padding: 14px 16px; }
  .toc { position: static; max-height: none; margin: 0 0 16px; padding: 8px 12px; border: 1px solid var(--line); border-radius: 8px; }
  .note h1 { font-size: 24px; }
  .note h2 { font-size: 19px; margin-top: 36px; }
  .code[data-lang]::before { left: 12px; }
  .code pre { padding: 36px 12px 12px; border-radius: 6px; }
  .code pre code { font-size: 12.5px; }
  .home { padding: 14px 16px; }
  .home h1 { font-size: 26px; }
  .pager { flex-direction: column; }
  .pager a { max-width: none; }
  .pager a.next { margin-left: 0; text-align: left; }
}

/* 打印 */
@media print {
  header.top, .toc, .copy, .pager, .search, footer { display: none; }
  body { font-size: 11pt; line-height: 1.6; }
  .layout { display: block; max-width: none; padding: 0; }
  a { color: inherit; }
  .code[data-lang]::before { display: none; }
  .code pre { overflow: visible; padding: 10px 12px; }
  .code pre code { white-space: pre-wrap; word-break: break-all; font-size: 9.5pt; }
  .note h2, .note h3 { break-after: avoid; }
  tr { break-inside: avoid; }
  .table-wrap { overflow: visible; }
}