:root {
  --paper: #ffffff;
  --surface: #f7f8fa;
  --ink: #242629;
  --muted: #6f737a;
  --line: #e4e6e9;
  --blue: #3f5fc7;
  --blue-deep: #2947aa;
  --blue-soft: #eef2ff;
  --header-height: 64px;
  --sidebar-width: 270px;
  --content-width: 1280px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 28px);
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: Inter, "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.78;
  text-rendering: optimizeLegibility;
}

a {
  color: var(--blue);
  text-underline-offset: 0.2em;
}

a:hover {
  color: var(--blue-deep);
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: 10px;
  left: 12px;
  padding: 7px 13px;
  color: #fff;
  background: var(--blue-deep);
  border-radius: 5px;
  transform: translateY(-150%);
}

.skip-link:focus {
  transform: translateY(0);
}

.reading-progress {
  position: fixed;
  z-index: 100;
  inset: 0 0 auto;
  height: 2px;
  pointer-events: none;
}

.reading-progress span {
  display: block;
  width: 100%;
  height: 100%;
  background: var(--blue);
  transform: scaleX(0);
  transform-origin: left;
}

.site-header {
  position: sticky;
  z-index: 80;
  top: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
  padding: 0 max(24px, calc((100vw - var(--content-width)) / 2));
  background: rgba(255, 255, 255, 0.96);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(10px);
}

.brand {
  display: inline-flex;
  gap: 10px;
  align-items: center;
  color: var(--ink);
  font-weight: 700;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  width: 28px;
  height: 28px;
  color: #fff;
  background: var(--blue);
  border-radius: 6px;
  place-items: center;
  font-size: 13px;
  font-weight: 800;
}

.header-link {
  color: var(--muted);
  font-size: 14px;
  text-decoration: none;
}

.docs-shell {
  display: grid;
  grid-template-columns: var(--sidebar-width) minmax(0, 1fr);
  width: min(100%, var(--content-width));
  min-height: calc(100vh - var(--header-height));
  margin: 0 auto;
}

.docs-sidebar {
  position: sticky;
  top: var(--header-height);
  align-self: start;
  height: calc(100vh - var(--header-height));
  padding: 48px 28px 64px 20px;
  overflow-y: auto;
  border-right: 1px solid var(--line);
  scrollbar-width: thin;
}

.toc-panel > summary {
  margin: 0 0 16px;
  color: #9a9da3;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.13em;
  list-style: none;
  text-transform: uppercase;
}

.toc-panel > summary::-webkit-details-marker {
  display: none;
}

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

.toc-list li {
  min-width: 0;
}

.toc-list a {
  display: block;
  margin: 2px 0;
  padding: 6px 10px 6px 13px;
  overflow: hidden;
  color: #4d5157;
  border-left: 2px solid transparent;
  border-radius: 0 5px 5px 0;
  font-size: 14px;
  line-height: 1.5;
  text-decoration: none;
  text-overflow: ellipsis;
}

.toc-list a:hover {
  color: var(--blue);
  background: var(--surface);
}

.toc-list a[aria-current="location"] {
  color: var(--blue);
  background: var(--blue-soft);
  border-left-color: var(--blue);
  font-weight: 700;
}

.toc-level-2 {
  margin-top: 7px;
}

.toc-level-2 a {
  color: #292c30;
  font-weight: 650;
}

.toc-level-3 a {
  padding-left: 28px;
  color: var(--muted);
  font-size: 13px;
}

.docs-main {
  min-width: 0;
  padding: 62px 64px 100px;
}

.guide-content {
  width: min(100%, 830px);
  margin: 0 auto;
}

.guide-content h2,
.guide-content h3,
.guide-content h4 {
  position: relative;
  color: var(--ink);
  line-height: 1.35;
  scroll-margin-top: calc(var(--header-height) + 24px);
}

.guide-content h2 {
  margin: 82px 0 26px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
  font-size: clamp(1.75rem, 3.5vw, 2.35rem);
  font-weight: 600;
  letter-spacing: -0.02em;
}

.guide-content h2:first-child {
  margin-top: 0;
  padding-top: 0;
  color: #62666c;
  border-top: 0;
  font-size: clamp(2.35rem, 5vw, 3.65rem);
  font-weight: 400;
}

.guide-content h3 {
  margin: 52px 0 20px;
  font-size: clamp(1.25rem, 2.2vw, 1.6rem);
  font-weight: 650;
}

.guide-content h4 {
  margin: 34px 0 14px;
  color: var(--blue-deep);
  font-size: 1.05rem;
  font-weight: 700;
}

.heading-anchor {
  color: inherit;
  text-decoration: none;
}

.heading-anchor::after {
  content: "#";
  margin-left: 0.42em;
  color: var(--blue);
  font-size: 0.58em;
  opacity: 0;
  transition: opacity 140ms ease;
}

.section-heading:hover .heading-anchor::after,
.heading-anchor:focus-visible::after,
.section-heading.link-copied .heading-anchor::after {
  opacity: 0.7;
}

.section-heading.link-copied .heading-anchor::after {
  content: "已复制";
  font-size: 11px;
}

.guide-content p {
  margin: 0 0 18px;
}

.guide-content ul,
.guide-content ol {
  margin: 0 0 24px;
  padding-left: 1.45em;
}

.guide-content li {
  margin: 7px 0;
  padding-left: 0.22em;
}

.guide-content li::marker {
  color: var(--blue);
  font-weight: 700;
}

.guide-content blockquote {
  margin: 27px 0;
  padding: 17px 21px;
  color: #4d5360;
  background: var(--blue-soft);
  border-left: 3px solid var(--blue);
  border-radius: 0 7px 7px 0;
}

.guide-content blockquote > :last-child {
  margin-bottom: 0;
}

code {
  padding: 0.14em 0.36em;
  color: #46569b;
  background: #eff1f8;
  border-radius: 4px;
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 0.88em;
  overflow-wrap: anywhere;
}

.direct-link {
  overflow-wrap: anywhere;
}

.table-scroll {
  width: 100%;
  margin: 26px 0 34px;
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 8px;
}

table {
  width: 100%;
  min-width: 620px;
  border-collapse: collapse;
  background: var(--paper);
  font-size: 14px;
  line-height: 1.55;
}

th,
td {
  padding: 13px 15px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--line);
}

th {
  color: #454951;
  background: var(--surface);
  font-size: 12px;
  letter-spacing: 0.03em;
}

tr:last-child td {
  border-bottom: 0;
}

hr {
  margin: 62px 0;
  border: 0;
  border-top: 1px solid var(--line);
}

.site-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 830px;
  margin: 0 auto;
  padding: 30px 0 40px;
  color: var(--muted);
  border-top: 1px solid var(--line);
  font-size: 13px;
}

.site-footer p {
  margin: 0;
}

.site-footer a {
  color: var(--ink);
  text-decoration: none;
}

.back-to-top {
  position: fixed;
  z-index: 50;
  right: 22px;
  bottom: 22px;
  display: grid;
  width: 42px;
  height: 42px;
  padding: 0;
  color: #fff;
  background: var(--blue);
  border: 0;
  border-radius: 50%;
  box-shadow: 0 7px 20px rgba(63, 95, 199, 0.25);
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  transform: translateY(10px);
  transition: opacity 170ms ease, transform 170ms ease;
  place-items: center;
}

.back-to-top.is-visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

@media (min-width: 801px) {
  .toc-panel > summary {
    pointer-events: none;
  }
}

@media (max-width: 800px) {
  :root {
    --header-height: 58px;
  }

  .site-header {
    padding: 0 18px;
  }

  .header-link {
    display: none;
  }

  .docs-shell {
    display: block;
  }

  .docs-sidebar {
    position: sticky;
    z-index: 60;
    top: var(--header-height);
    width: 100%;
    height: auto;
    padding: 12px 18px;
    overflow: visible;
    background: rgba(255, 255, 255, 0.98);
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .toc-panel > summary {
    margin: 0;
    color: #4c5158;
    cursor: pointer;
    font-size: 13px;
    letter-spacing: 0;
    text-transform: none;
  }

  .toc-panel > summary::after {
    content: "＋";
    float: right;
    color: var(--muted);
  }

  .toc-panel[open] > summary::after {
    content: "－";
  }

  .toc-list {
    max-height: 58vh;
    margin-top: 12px;
    padding-top: 10px;
    overflow-y: auto;
    border-top: 1px solid var(--line);
  }

  .docs-main {
    padding: 42px 20px 74px;
  }

  .guide-content h2 {
    margin-top: 64px;
  }

  .guide-content h3 {
    margin-top: 42px;
  }

  .site-footer {
    width: calc(100% - 40px);
  }
}

@media (max-width: 520px) {
  body {
    font-size: 15px;
  }

  .guide-content h2:first-child {
    font-size: 2.15rem;
  }

  .site-footer {
    display: block;
  }

  .site-footer a {
    display: inline-block;
    margin-top: 9px;
  }

  .back-to-top {
    right: 14px;
    bottom: 14px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}