.doc { width: min(760px, calc(100% - 48px)); margin: 0 auto; padding: 84px 0 40px; }
.doc h1 { margin: 0; color: var(--ink); font-size: 38px; font-weight: 700; line-height: 1.28; letter-spacing: -.5px; }
.doc h2 { margin: 54px 0 14px; padding-top: 30px; border-top: 1px solid var(--line); color: var(--ink); font-size: 23px; font-weight: 700; line-height: 1.35; }
.doc h3 { margin: 30px 0 8px; color: var(--ink); font-size: 16px; font-weight: 700; }
.doc p { margin: 14px 0 0; color: var(--ink-2); font-size: 15px; line-height: 1.85; }
.doc ul, .doc ol { margin: 14px 0 0; padding-left: 20px; color: var(--ink-2); font-size: 15px; line-height: 1.85; }
.doc li { margin: 7px 0; }
.doc li > strong { color: var(--ink); }
.doc a:not(.button) { color: var(--brand); font-weight: 650; text-decoration: none; transition: color 160ms ease; }
.doc a:not(.button):hover { color: var(--brand-dark); }
.doc code { border: 1px solid var(--line); border-radius: 4px; padding: 1px 5px; background: var(--canvas); color: var(--ink); font: 12.5px ui-monospace, SFMono-Regular, Menlo, monospace; }
.doc pre { overflow-x: auto; margin: 16px 0 0; border: 1px solid var(--line); border-radius: 6px; padding: 14px 16px; background: var(--canvas); }
.doc pre code { border: 0; padding: 0; background: none; line-height: 1.7; }

/*
 * 报头。必须排在上面的正文链接规则之后：面包屑链接和正文链接的选择器
 * 特异性一样，后面的规则才能保留面包屑更弱的层级。
 */
.doc-head .doc-crumb {
  display: flex;
  align-items: center;
  gap: 9px;
  margin: 0 0 20px;
  color: var(--ink-3);
  font-size: 12.5px;
  line-height: 1.5;
}
.doc-head .doc-crumb a { color: var(--ink-3); font-weight: 500; text-decoration: none; }
.doc-head .doc-crumb a:hover { color: var(--brand); }
.doc-head .doc-crumb span { color: var(--line-strong); }

/* 导语是报头里的独立编辑区，不靠「正文放大」冒充层级。 */
.doc-head .doc-lead {
  position: relative;
  margin: 24px 0 0;
  border-block: 1px solid var(--line);
  padding: 18px 0 18px 86px;
  color: var(--ink-2);
  font-size: 16.5px;
  font-weight: 500;
  line-height: 1.78;
  text-wrap: pretty;
}
.doc-head .doc-lead::before {
  position: absolute;
  top: 20px;
  left: 0;
  color: var(--brand);
  content: "导读";
  font-size: 11px;
  font-weight: 750;
  line-height: 1.4;
  letter-spacing: .12em;
}
.doc-head .doc-lead::after {
  position: absolute;
  top: 18px;
  bottom: 18px;
  left: 62px;
  width: 1px;
  background: var(--line-strong);
  content: "";
}

/* 更新时间做成一枚小胶囊，比原来那条通栏横线干净，也不会和 h2 的横线撞在一起 */
.doc-head .doc-meta {
  display: inline-flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin: 24px 0 0;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 5px 14px;
  background: var(--canvas);
  color: var(--ink-3);
  font-size: 12px;
  line-height: 1.7;
}
.doc-head .doc-meta span + span { display: inline-flex; align-items: center; gap: 10px; }
.doc-head .doc-meta span + span::before {
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: var(--line-strong);
  content: "";
}

.doc-scroll { overflow-x: auto; margin: 18px 0 0; }
.doc table { width: 100%; min-width: 460px; border-collapse: collapse; font-size: 14px; }
.doc th, .doc td { border-bottom: 1px solid var(--line); padding: 11px 12px; text-align: left; vertical-align: top; line-height: 1.7; }
.doc th:first-child, .doc td:first-child { white-space: nowrap; }
.doc th { border-bottom-color: var(--line-strong); background: var(--canvas); color: var(--ink); font-weight: 700; }
.doc td { color: var(--ink-2); }
.doc td strong { color: var(--ink); }

.doc-note { margin: 20px 0 0; border: 1px solid var(--line); border-left: 2px solid var(--brand); border-radius: 0 6px 6px 0; padding: 15px 18px; background: var(--brand-soft); color: var(--ink-2); font-size: 14px; line-height: 1.8; }
.doc-note.is-warn { border-left-color: var(--amber); background: var(--amber-soft); }
.doc-note > strong:first-child { display: block; margin-bottom: 4px; color: var(--ink); }
.doc-note strong { color: var(--ink); }
.doc-note :first-child { margin-top: 0; }

.doc-cta { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 20px; margin: 56px 0 0; border: 1px solid var(--line); border-radius: 8px; padding: 26px 28px; background: #fff; box-shadow: 0 18px 50px -40px rgb(15 23 42 / 30%); }
.doc-cta div { max-width: 420px; }
.doc-cta strong { display: block; color: var(--ink); font-size: 17px; }
.doc-cta p { margin: 7px 0 0; font-size: 13.5px; }

.doc-related { margin: 44px 0 0; border-top: 1px solid var(--line); padding-top: 26px; }
.doc-related h2 { margin: 0 0 4px; padding: 0; border: 0; font-size: 13px; }
.doc-related ul { margin: 10px 0 0; padding: 0; list-style: none; }
.doc-related li { margin: 0; border-top: 1px solid var(--line); }
.doc-related li:first-child { border-top: 0; }
.doc .doc-related a { display: flex; align-items: baseline; gap: 10px; padding: 13px 0; color: var(--ink); font-size: 14.5px; font-weight: 650; text-decoration: none; }
.doc .doc-related a:hover { color: var(--brand); }
.doc-related small { color: var(--ink-3); font-size: 12px; font-weight: 400; }

/* 目录页是一张“排障地图”：左边给判断，右边像监控面板一样直接分流。 */
.doc-hub { width: min(1040px, calc(100% - 48px)); counter-reset: guide-group; }
.doc-hub .doc-head {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(300px, .8fr);
  gap: 52px;
  align-items: stretch;
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 42px;
  background: #fff;
  box-shadow: 0 28px 70px -52px rgb(23 32 51 / 42%);
}
.doc-hub .doc-head-copy { min-width: 0; }
.doc-hub .doc-kicker {
  display: flex;
  align-items: center;
  gap: 9px;
  margin: 0 0 18px;
  color: var(--brand);
  font-size: 11px;
  font-weight: 750;
  letter-spacing: .12em;
}
.doc-hub .doc-kicker span { width: 18px; border-top: 2px solid currentColor; }
.doc-hub h1 { font-size: 42px; line-height: 1.2; text-wrap: balance; }
.doc-hub h1 span { display: block; margin-bottom: 8px; color: var(--brand); font-size: 14px; letter-spacing: .08em; }
.doc-hub .doc-head .doc-lead { margin-top: 20px; border: 0; padding: 0; font-size: 16px; line-height: 1.78; }
.doc-hub .doc-head .doc-lead::before, .doc-hub .doc-head .doc-lead::after { display: none; }
.hub-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 12px 18px; margin-top: 25px; }
.doc .hub-text-link { color: var(--ink-2); font-size: 13px; font-weight: 650; }
.doc .hub-text-link:hover { color: var(--brand); }
.doc-hub .doc-head .doc-meta { margin-top: 20px; border: 0; padding: 0; background: transparent; }

.hub-navigator { overflow: hidden; border: 1px solid #d9deee; border-radius: 10px; background: #f5f6fc; padding: 8px; color: var(--ink); }
.hub-navigator > p { display: flex; align-items: center; justify-content: space-between; gap: 16px; margin: 0; padding: 13px 14px 14px; color: var(--ink); }
.hub-navigator > p span { font-size: 12px; font-weight: 750; letter-spacing: .08em; }
.hub-navigator > p small { color: var(--ink-3); font-size: 11px; }
.doc .hub-navigator a {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 3px 12px;
  margin-top: 2px;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: #fff;
  padding: 14px;
  color: var(--ink);
  font-size: 13px;
  font-weight: 700;
  transition: border-color 160ms ease, background-color 160ms ease, transform 160ms ease;
}
.doc .hub-navigator a:hover { border-color: #b9c2df; background: var(--brand-soft); color: var(--brand-dark); transform: translateX(2px); }
.hub-navigator a small { grid-column: 1; color: var(--ink-3); font-size: 11px; font-weight: 450; }
.hub-navigator a b { grid-column: 2; grid-row: 1 / 3; align-self: center; color: var(--brand); font-size: 16px; }

.doc-hub > h2 { margin-top: 62px; padding-top: 0; border-top: 0; font-size: 25px; }
.doc-hub > h2 + p { max-width: 650px; margin-top: 8px; }
.doc-hub .popular-note { color: var(--ink-3); font-size: 13px; }
.popular-grid { display: grid; grid-template-columns: 1.15fr .85fr; grid-template-rows: repeat(2, minmax(180px, auto)); gap: 12px; margin-top: 22px; }
.doc .popular-card {
  position: relative;
  display: flex;
  min-width: 0;
  flex-direction: column;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 11px;
  background: #fff;
  padding: 24px;
  color: var(--ink);
  font-weight: 500;
  box-shadow: 0 18px 38px -34px rgb(15 23 42 / 38%);
  transition: border-color 180ms ease, box-shadow 180ms ease, transform 180ms ease;
}
.doc .popular-card:hover { border-color: #aeb7df; color: var(--ink); box-shadow: 0 22px 44px -32px rgb(41 51 120 / 40%); transform: translateY(-2px); }
.doc a.popular-card-1 { grid-row: 1 / 3; border-color: #cbd2ef; background: #f1f3ff; color: var(--ink); padding: 30px; }
.doc a.popular-card-1:hover { border-color: #9da9dd; color: var(--ink); }
.popular-rank { position: absolute; top: 14px; right: 20px; color: rgb(62 78 188 / 13%); font: 750 58px/1 ui-monospace, SFMono-Regular, Menlo, monospace; }
.popular-card-1 .popular-rank { color: rgb(62 78 188 / 9%); font-size: 76px; }
.popular-type { width: fit-content; border-radius: 999px; background: var(--brand-soft); padding: 4px 8px; color: var(--brand); font-size: 10px; font-weight: 750; letter-spacing: .06em; }
.popular-card-1 .popular-type { border: 1px solid #d8def6; background: #fff; color: var(--brand); }
.popular-card > strong { position: relative; max-width: 90%; margin-top: 25px; font-size: 17px; line-height: 1.45; text-wrap: balance; }
.popular-card-1 > strong { margin-top: 56px; font-size: 25px; }
.popular-card > small { position: relative; margin-top: 8px; color: var(--ink-3); font-size: 12px; line-height: 1.65; }
.popular-card-1 > small { max-width: 90%; color: var(--ink-2); font-size: 13px; }
.popular-footer { display: flex; align-items: center; justify-content: space-between; gap: 14px; margin-top: auto; padding-top: 22px; color: var(--ink-3); font-size: 11px; }
.popular-card-1 .popular-footer { color: var(--ink-3); }
.popular-signal { display: inline-flex; align-items: center; gap: 7px; }
.popular-signal i { width: 6px; height: 6px; border-radius: 50%; background: var(--green); box-shadow: 0 0 0 4px rgb(22 132 71 / 10%); }
.popular-card-1 .popular-signal i { background: var(--green); box-shadow: 0 0 0 4px rgb(22 132 71 / 10%); }
.popular-footer b { color: var(--brand); font-size: 14px; }
.popular-card-1 .popular-footer b { color: var(--brand); }

.doc-hub > h3 {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 34px 0 0;
  color: var(--brand-dark);
  counter-increment: guide-group;
  font-size: 16px;
  line-height: 1.45;
}
.doc-hub > h3::before {
  display: grid;
  width: 30px;
  height: 24px;
  flex: 0 0 auto;
  place-items: center;
  border-radius: 5px;
  background: var(--brand-soft);
  color: var(--brand);
  content: "0" counter(guide-group);
  font: 750 10px ui-monospace, SFMono-Regular, Menlo, monospace;
}
.doc-hub > h3 + p { margin-top: 12px; }
.doc-hub > .doc-related {
  margin: 16px 0 0;
  border: 0;
  padding: 0;
}
.doc-hub > .doc-related ul { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; margin-top: 0; }
.doc-hub > .doc-related.is-ordered ul { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.doc-hub > .doc-related li { border: 0; }
.doc-hub .doc-related a {
  position: relative;
  height: 100%;
  align-items: flex-start;
  flex-direction: column;
  gap: 6px;
  margin: 0;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: #fff;
  padding: 17px 42px 17px 18px;
  line-height: 1.5;
  transition: border-color 160ms ease, box-shadow 160ms ease, color 160ms ease, transform 160ms ease;
}
.doc-hub .doc-related a::after { position: absolute; top: 17px; right: 17px; color: var(--line-strong); content: "↗"; font-size: 13px; transition: color 160ms ease, transform 160ms ease; }
.doc-hub .doc-related a:hover { border-color: #b9c2df; box-shadow: 0 16px 30px -28px rgb(41 51 120 / 50%); transform: translateY(-1px); }
.doc-hub .doc-related a:hover::after { color: var(--brand); transform: translate(1px, -1px); }
.doc-hub .doc-related small { line-height: 1.6; }

@media (max-width: 740px) {
  /* 窄屏下标题和说明并排会把标题挤成一栏，改成上下堆叠 */
  .doc .doc-related a { flex-direction: column; gap: 3px; }
  .doc { padding: 60px 0 32px; }
  .doc h1 { font-size: 29px; }
  .doc h2 { margin-top: 40px; padding-top: 24px; font-size: 20px; }
  .doc-head .doc-lead { margin-top: 20px; padding: 16px 0; font-size: 16px; }
  .doc-head .doc-lead::before { position: static; display: block; margin-bottom: 7px; }
  .doc-head .doc-lead::after { display: none; }

  /* 移动端保留“快速定位 → 热门 → 全部指南”的顺序。 */
  .doc-hub {
    width: min(1040px, calc(100% - 32px));
    padding-top: 68px;
  }
  .doc-hub .doc-head { grid-template-columns: 1fr; gap: 26px; border-radius: 11px; padding: 24px 20px 20px; }
  .doc-hub h1 { font-size: 31px; }
  .doc-hub h1 span { margin-bottom: 6px; font-size: 12px; }
  .doc-hub .doc-head .doc-lead { margin-top: 16px; font-size: 15px; line-height: 1.72; }
  .hub-actions { align-items: stretch; flex-direction: column; margin-top: 21px; }
  .hub-actions .button { width: 100%; }
  .doc .hub-text-link { text-align: center; }
  .doc-hub .doc-head .doc-meta {
    display: inline-flex;
    width: auto;
    justify-content: flex-start;
    gap: 9px;
    box-sizing: border-box;
    margin-top: 18px;
    border: 0;
    border-radius: 0;
    padding: 0;
    background: transparent;
  }
  .hub-navigator { border-radius: 8px; }
  .popular-grid { grid-template-columns: 1fr; grid-template-rows: auto; }
  .doc .popular-card, .doc .popular-card-1 { grid-row: auto; min-height: 205px; padding: 22px; }
  .popular-card-1 > strong { margin-top: 36px; font-size: 22px; }
  .popular-card-1 .popular-rank { font-size: 62px; }
  .doc-hub > h2 {
    margin-top: 42px;
    border: 0;
    padding-top: 0;
    font-size: 21px;
  }
  .doc-hub > h3 {
    align-items: flex-start;
    gap: 11px;
    margin-top: 26px;
    color: var(--ink);
    font-size: 17px;
  }
  .doc-hub > .doc-related + h3 {
    margin-top: 34px;
    border-top: 1px solid var(--line);
    padding-top: 28px;
  }
  .doc-hub > h3 + p {
    margin-top: 10px;
    font-size: 14px;
    line-height: 1.72;
  }
  .doc-hub > .doc-related {
    margin-top: 14px;
    padding: 0;
  }
  .doc-hub > .doc-related ul, .doc-hub > .doc-related.is-ordered ul { grid-template-columns: 1fr; gap: 8px; }
  .doc-hub .doc-related a {
    min-height: 84px;
    align-items: flex-start;
    justify-content: center;
    gap: 4px;
    box-sizing: border-box;
    padding: 14px 42px 14px 15px;
    line-height: 1.45;
    overflow-wrap: anywhere;
    text-wrap: pretty;
  }
  .doc-hub .doc-related small {
    font-size: 12.5px;
    line-height: 1.55;
  }
  .doc-hub > .doc-cta {
    align-items: stretch;
    gap: 18px;
    margin-top: 40px;
    padding: 22px 18px;
  }
  .doc-hub > .doc-cta div { max-width: none; }
  .doc-hub > .doc-cta .button { width: 100%; justify-content: center; }
}

@media (max-width: 360px) {
  .doc-hub { width: min(760px, calc(100% - 28px)); }
  .doc-hub .doc-head .doc-meta { font-size: 11.5px; }
}