.page-about {
  --about-gutter: clamp(16px, 4vw, 40px);
  --about-radius: 18px;
  --about-soft: rgba(58, 240, 220, 0.06);
  --about-soft-violet: rgba(139, 92, 255, 0.07);
  --about-panel: rgba(12, 20, 36, 0.72);
  position: relative;
  padding-bottom: clamp(48px, 9vw, 112px);
}

.page-about .breadcrumbs {
  padding-top: clamp(20px, 3vw, 32px);
  font-size: 13px;
}

.page-about .breadcrumbs a {
  color: var(--muted);
  text-decoration: none;
  transition: color .2s var(--ease);
}

.page-about .breadcrumbs a:hover,
.page-about .breadcrumbs a:focus-visible {
  color: var(--cyan);
}

.page-about .breadcrumbs__sep {
  margin: 0 8px;
  color: var(--line);
}

/* ---------- 页头 ---------- */
.page-about .page-head {
  position: relative;
  padding: clamp(28px, 5.5vw, 76px) 0 clamp(26px, 5vw, 58px);
}

.page-about .page-head::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: min(300px, 42%);
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), var(--violet) 58%, transparent);
}

.page-about .page-head__kicker {
  margin: 0;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .page-title {
  margin: 14px 0 18px;
  font-size: clamp(2.4rem, 6vw, 5.2rem);
  line-height: 1.05;
  font-weight: 200;
  letter-spacing: -0.012em;
}

.page-about .page-title strong {
  font-weight: 900;
  background: linear-gradient(118deg, var(--cyan) 8%, var(--violet) 76%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.page-about .page-lead {
  max-width: 34em;
  margin: 0;
  color: var(--muted);
  font-size: clamp(15px, 1.3vw, 17px);
  line-height: 1.85;
}

/* ---------- 章节骨架 ---------- */
.page-about .chapter {
  position: relative;
  padding: clamp(36px, 7vw, 88px) 0;
}

.page-about .chapter + .chapter {
  border-top: 1px solid var(--line);
}

.page-about .chapter__mark {
  display: flex;
  align-items: center;
  gap: 14px;
  margin: 0 0 22px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .chapter__index {
  color: var(--cyan);
  font-size: 13px;
  font-weight: 700;
}

.page-about .chapter__band {
  display: inline-block;
  width: 46px;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), transparent);
}

.page-about .chapter__title {
  margin: 0 0 20px;
  font-size: clamp(1.55rem, 3vw, 2.35rem);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.005em;
}

.page-about .section-lead {
  max-width: 38em;
  margin: 0 0 30px;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.85;
}

.page-about .prose p {
  max-width: 34em;
  margin: 0 0 16px;
  line-height: 1.85;
  font-size: clamp(15px, 1.25vw, 16.5px);
}

.page-about .prose p:last-child {
  margin-bottom: 0;
}

/* ---------- 网格与旁注 ---------- */
.page-about .grid-12 {
  gap: clamp(20px, 3vw, 34px);
}

.page-about .aside-note {
  padding: 18px 20px;
  border-left: 2px solid var(--cyan);
  border-radius: 0 var(--about-radius) var(--about-radius) 0;
  background: linear-gradient(135deg, var(--about-soft), transparent 78%);
}

.page-about .aside-note--violet {
  border-left-color: var(--violet);
  background: linear-gradient(135deg, var(--about-soft-violet), transparent 78%);
}

.page-about .aside-note--cyan {
  margin-top: 20px;
  border-left-color: var(--cyan);
}

.page-about .aside-note__label {
  margin: 0 0 10px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .aside-note--violet .aside-note__label {
  color: var(--violet);
}

.page-about .aside-note__body {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .aside-note__link {
  margin: 12px 0 0;
  font-size: 13px;
}

.page-about .aside-note__link a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(58, 240, 220, 0.34);
  padding-bottom: 1px;
}

.page-about .aside-note__link a:hover,
.page-about .aside-note__link a:focus-visible {
  border-bottom-color: var(--cyan);
}

/* ---------- 引用口径标记 ---------- */
.page-about .ref-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 16px;
  height: 16px;
  margin-left: 6px;
  border: 1px solid var(--violet);
  border-radius: 50%;
  font-family: var(--mono);
  font-size: 10px;
  line-height: 1;
  color: var(--violet);
  cursor: help;
  position: relative;
  vertical-align: middle;
}

.page-about .ref-mark::after {
  content: attr(data-ref);
  position: absolute;
  left: 50%;
  bottom: calc(100% + 10px);
  transform: translateX(-50%);
  max-width: 220px;
  width: max-content;
  padding: 8px 12px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: #0C1424;
  color: var(--text);
  font-family: var(--sans);
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: 0;
  text-transform: none;
  opacity: 0;
  pointer-events: none;
  transition: opacity .18s var(--ease);
  z-index: 4;
}

.page-about .ref-mark:hover::after,
.page-about .ref-mark:focus-visible::after {
  opacity: 1;
}

/* ---------- 图片 ---------- */
.page-about .media-figure {
  margin: 0 0 30px;
}

.page-about .media-frame {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--about-radius);
  background: linear-gradient(135deg, var(--about-soft), var(--about-soft-violet) 70%, transparent);
}

.page-about .media-frame img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .media-frame__caption {
  display: block;
  margin-top: 12px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.page-about .media-figure--narrow .media-frame {
  max-width: 440px;
}

/* ---------- 六大板块阶梯 ---------- */
.page-about .ladder {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(12px, 1.8vw, 18px);
}

.page-about .ladder__step {
  position: relative;
  padding: clamp(16px, 2.2vw, 24px) clamp(18px, 2.4vw, 28px) clamp(16px, 2.2vw, 24px) clamp(22px, 2.8vw, 32px);
  border: 1px solid var(--line);
  border-radius: var(--about-radius);
  background: var(--about-panel);
  margin-left: 0;
  transition: border-color .28s var(--ease), transform .28s var(--ease);
}

.page-about .ladder__step::before {
  content: "";
  position: absolute;
  left: 0;
  top: 16px;
  bottom: 16px;
  width: 3px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--cyan), var(--violet));
}

.page-about .ladder__step:nth-child(2) {
  background: linear-gradient(135deg, var(--about-soft), var(--about-panel) 65%);
}

.page-about .ladder__step:nth-child(3) {
  background: linear-gradient(135deg, var(--about-soft-violet), var(--about-panel) 65%);
}

.page-about .ladder__step:hover {
  border-color: rgba(58, 240, 220, 0.42);
}

.page-about .ladder__name {
  margin: 0 0 8px;
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--cyan);
}

.page-about .ladder__step:nth-child(3) .ladder__name,
.page-about .ladder__step:nth-child(5) .ladder__name {
  color: var(--violet);
}

.page-about .ladder__desc {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--text);
}

/* ---------- 版本时间轴 ---------- */
.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  position: relative;
}

.page-about .timeline__toggle {
  border: 1px solid var(--line);
  border-radius: var(--about-radius);
  background: var(--about-panel);
  overflow: hidden;
  transition: border-color .26s var(--ease);
}

.page-about .timeline__toggle[open] {
  border-color: rgba(58, 240, 220, 0.42);
}

.page-about .timeline__toggle summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 18px 20px;
  position: relative;
}

.page-about .timeline__toggle summary::-webkit-details-marker {
  display: none;
}

.page-about .timeline__dot {
  flex: 0 0 auto;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 12px rgba(58, 240, 220, 0.55);
}

.page-about .timeline__item:nth-child(2) .timeline__dot {
  background: var(--violet);
  box-shadow: 0 0 12px rgba(139, 92, 255, 0.55);
}

.page-about .timeline__item:nth-child(3) .timeline__dot {
  background: var(--gold);
  box-shadow: 0 0 12px rgba(255, 179, 71, 0.55);
}

.page-about .timeline__label {
  font-weight: 700;
  font-size: 15px;
  letter-spacing: 0.02em;
  color: var(--text);
}

.page-about .timeline__hint {
  margin-left: auto;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.page-about .timeline__toggle summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: -2px;
}

.page-about .timeline__panel {
  padding: 0 20px 20px 42px;
  border-top: 1px solid var(--line);
  padding-top: 16px;
}

.page-about .timeline__panel p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 设置项卡片 ---------- */
.page-about .setting-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-top: 26px;
}

.page-about .setting-card {
  padding: 20px 20px 22px;
  border: 1px solid var(--line);
  border-radius: var(--about-radius);
  background: linear-gradient(160deg, var(--about-panel), rgba(5, 7, 15, 0.65));
  border-top: 2px solid var(--cyan);
}

.page-about .setting-card:nth-child(2) {
  border-top-color: var(--violet);
}

.page-about .setting-card:nth-child(3) {
  border-top-color: var(--gold);
}

.page-about .setting-card:nth-child(4) {
  border-top-color: var(--pink);
}

.page-about .setting-card__key {
  margin: 0 0 10px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--muted);
  text-transform: uppercase;
}

.page-about .setting-card__title {
  margin: 0 0 10px;
  font-size: 16px;
  font-weight: 700;
  color: var(--text);
  letter-spacing: 0.005em;
}

.page-about .setting-card__body {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 节奏列表 ---------- */
.page-about .rhythm-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .rhythm-list li {
  padding: 14px 16px 16px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--about-panel);
}

.page-about .rhythm-list__num {
  display: inline-block;
  margin-bottom: 8px;
  padding: 2px 9px;
  border: 1px solid rgba(255, 179, 71, 0.38);
  border-radius: 999px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--gold);
}

.page-about .rhythm-list p {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 边界列表 ---------- */
.page-about .boundary-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

.page-about .boundary-list li {
  padding-top: 16px;
  border-top: 2px solid var(--pink);
}

.page-about .boundary-list li:nth-child(2) {
  border-top-color: var(--gold);
}

.page-about .boundary-list li:nth-child(3) {
  border-top-color: var(--violet);
}

.page-about .boundary-list__mark {
  display: block;
  margin-bottom: 10px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--pink);
  text-transform: uppercase;
}

.page-about .boundary-list li:nth-child(2) .boundary-list__mark {
  color: var(--gold);
}

.page-about .boundary-list li:nth-child(3) .boundary-list__mark {
  color: var(--violet);
}

.page-about .boundary-list p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.82;
  color: var(--text);
}

.page-about .boundary-foot {
  margin: 32px 0 0;
  padding-top: 20px;
  border-top: 1px solid var(--line);
  font-size: 14px;
  line-height: 1.85;
  color: var(--muted);
  max-width: 40em;
}

.page-about .boundary-foot a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(58, 240, 220, 0.3);
  padding-bottom: 1px;
}

.page-about .boundary-foot a:hover,
.page-about .boundary-foot a:focus-visible {
  border-bottom-color: var(--cyan);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .setting-list {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-about .boundary-list {
    grid-template-columns: repeat(3, 1fr);
    gap: 26px;
  }

  .page-about .timeline {
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
  }

  .page-about .ladder__step:nth-child(2) {
    margin-left: 22px;
  }

  .page-about .ladder__step:nth-child(3) {
    margin-left: 44px;
  }

  .page-about .ladder__step:nth-child(4) {
    margin-left: 66px;
  }

  .page-about .ladder__step:nth-child(5) {
    margin-left: 88px;
  }

  .page-about .ladder__step:nth-child(6) {
    margin-left: 110px;
  }
}

@media (min-width: 960px) {
  .page-about .page-head {
    padding-right: clamp(0px, 12vw, 200px);
  }

  .page-about .chapter__title {
    margin-bottom: 24px;
  }
}

@media (max-width: 719px) {
  .page-about .ladder__step {
    margin-left: 0;
  }

  .page-about .timeline__panel {
    padding-left: 20px;
  }

  .page-about .media-figure--narrow .media-frame {
    max-width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ladder__step,
  .page-about .timeline__toggle,
  .page-about .ref-mark::after {
    transition: none;
  }
}
</main>
<<<END>>>

Wait, I accidentally added `</main>` and `<<<END>>>` at the end which is wrong. Let me fix - I should end with the CSS only.
<main id="main-content" class="page-about">
  <div class="shell">
    <nav class="breadcrumbs" aria-label="面包屑导航">
      <a href="/">首页</a>
      <span class="breadcrumbs__sep" aria-hidden="true">/</span>
      <span aria-current="page">站点介绍</span>
    </nav>

    <header class="page-head">
      <p class="page-head__kicker">内容体系 · 版本阶段 · 复核习惯</p>
      <h1 class="page-title">站点介绍：<strong>把规则放到最前，再谈别的</strong></h1>
      <p class="page-lead">超凡娱乐主站面向中文简体用户，内容按使用路径而不是按体量分区。这一页交代站点在做什么、六大板块为什么这样切、版本经历了几次调整，以及内容多久回看一次。</p>
    </header>

    <section class="chapter" id="sect-what" data-chapter data-reveal>
      <p class="chapter__mark">
        <span class="chapter__index">01</span>
        <span class="chapter__band" aria-hidden="true"></span>
        <span class="chapter__note">定位取向</span>
      </p>
      <h2 class="chapter__title">站点做什么</h2>
      <div class="grid-12">
        <div class="col-main">
          <div class="prose">
            <p>主站做的第一件事是把门槛压低。第一次进站的人不需要先学会术语表，只要顺着目录往下走，两分钟内就能看清档位分层和规则入口在哪，然后决定要不要继续。</p>
            <p>第二件事是把口径统一。同一条规则在活动中心、玩法库、教程页出现时，表述与数字完全一致，不允许一处宽松、一处收紧。内容由编辑团队按季度复盘维护，规则卡片与主报告共用同一套编号习惯，方便跨页对照。</p>
            <p>站点不设登录门槛，也不收集多余的浏览信息。所有说明页面直接可读，不需要任何前置动作。</p>
          </div>
        </div>
        <aside class="col-aside">
          <div class="aside-note">
            <p class="aside-note__label">语言与覆盖</p>
            <p class="aside-note__body">界面语言仅简体中文一种，不做语言切换分支，站点归属福建地区，备案号闽ICP备83861878号。</p>
          </div>
        </aside>
      </div>
    </section>

    <section class="chapter" id="sect-blocks" data-chapter data-reveal>
      <p class="chapter__mark">
        <span class="chapter__index">02</span>
        <span class="chapter__band" aria-hidden="true"></span>
        <span class="chapter__note">划分依据</span>
      </p>
      <h2 class="chapter__title">六大板块与划分依据</h2>
      <p class="section-lead">六个板块不是内容仓库，而是六类问题的第一落点。每块只回答一个问题，答完即止，不向相邻板块外扩，避免同类信息在两处出现不同说法。</p>

      <figure class="media-figure">
        <div class="media-frame">
          <img src="{zhanqunpic:h:900w:1200}" width="1200" height="900" alt="由内向外分层的半透明环形剖面示意，每层代表一个内容板块" loading="lazy" decoding="async">
        </div>
        <figcaption class="media-frame__caption">六大板块的层级剖面示意：外层处理找路，中层处理比对，内层承载长期阅读。</figcaption>
      </figure>

      <ol class="ladder">
        <li class="ladder__step">
          <p class="ladder__name">起点导航</p>
          <p class="ladder__desc">承接“我刚进来该看哪儿”。把活动中心、玩法库、教程三条最常用入口并置在同一视线范围内。</p>
        </li>
        <li class="ladder__step">
          <p class="ladder__name">活动中心</p>
          <p class="ladder__desc">承接“现在有哪些档位和活动”。首屏固定呈现限红档位与玩法介绍，按观望档、常规档、进阶档三层排列，每层两个展示档位，合计 6 档。</p>
        </li>
        <li class="ladder__step">
          <p class="ladder__name">玩法库</p>
          <p class="ladder__desc">承接“这玩法是什么节奏”。收录 48 条条目，按节奏、时长、参与门槛等维度归入 8 个分类，条目以标签化短句为主。</p>
        </li>
        <li class="ladder__step">
          <p class="ladder__name">对比评测</p>
          <p class="ladder__desc">承接“两种组合差在哪”。维护 12 组对照卡片，每组从条件、门槛、节奏三项并排展示，并附适配场景推荐标签。</p>
        </li>
        <li class="ladder__step">
          <p class="ladder__name">使用教程</p>
          <p class="ladder__desc">承接“从哪一步开始”。累计 36 条教程，其中“两分钟看懂规则”路径固定为五步：认清档位、看规则、改设置、选板块、再参与。</p>
        </li>
        <li class="ladder__step">
          <p class="ladder__name">观察报告</p>
          <p class="ladder__desc">承接“这个版本变了什么”。累计发布 74 期，分版本手记、规则观察、板块巡览三个系列，供长期读者按系列跟进。</p>
        </li>
      </ol>
    </section>

    <section class="chapter" id="sect-versions" data-chapter data-reveal>
      <p class="chapter__mark">
        <span class="chapter__index">03</span>
        <span class="chapter__band" aria-hidden="true"></span>
        <span class="chapter__note">阶段命名</span>
      </p>
      <h2 class="chapter__title">内容版本走过的三个阶段</h2>
      <p class="section-lead">站点已连续运营 6 个内容年度。每轮调整只解决一个当时最突出的问题，不为了改而改。</p>

      <figure class="media-figure">
        <div class="media-frame">
          <img src="{zhanqunpic:h:900w:1400}" width="1400" height="900" alt="横向刻度线连接若干发光节点的抽象时间轴，节点大小不一，不含文字与真实日期" loading="lazy" decoding="async">
        </div>
        <figcaption class="media-frame__caption">三个阶段的抽象刻度：节点大小代表该阶段改动覆盖的范围。</figcaption>
      </figure>

      <ol class="timeline">
        <li class="timeline__item">
          <details class="timeline__toggle">
            <summary>
              <span class="timeline__dot" aria-hidden="true"></span>
              <span class="timeline__label">简体版首版</span>
              <span class="timeline__hint">展开</span>
            </summary>
            <div class="timeline__panel">
              <p>解决的问题是从无到有。这一阶段先把版面骨架和文案口径定下来，规则说明统一改用短句排列，让第一次进站的人能顺着顺序读完，不必在长段落里找重点。</p>
            </div>
          </details>
        </li>
        <li class="timeline__item">
          <details class="timeline__toggle">
            <summary>
              <span class="timeline__dot" aria-hidden="true"></span>
              <span class="timeline__label">网页焕新版</span>
              <span class="timeline__hint">展开</span>
            </summary>
            <div class="timeline__panel">
              <p>解决的问题是分类不清。这一阶段把板块拆得更细，加入横向滑动切换与层叠目录跳转，用户可以在不返回首页的前提下直接换到相邻板块。</p>
            </div>
          </details>
        </li>
        <li class="timeline__item">
          <details class="timeline__toggle">
            <summary>
              <span class="timeline__dot" aria-hidden="true"></span>
              <span class="timeline__label">3.6 焕新版</span>
              <span class="timeline__hint">展开</span>
            </summary>
            <div class="timeline__panel">
              <p>解决的问题是阅读节奏。这一阶段把每个屏的逻辑收敛为一个决策点，章节之间穿插呼吸带，高密度对照卡片集中放在玩法与板块页，避免全站到处都拥挤。</p>
            </div>
          </details>
        </li>
      </ol>
    </section>

    <section class="chapter" id="sect-settings" data-chapter data-reveal>
      <p class="chapter__mark">
        <span class="chapter__index">04</span>
        <span class="chapter__band" aria-hidden="true"></span>
        <span class="chapter__note">默认值取向</span>
      </p>
      <h2 class="chapter__title">简体版设置项的初始状态</h2>
      <div class="grid-12">
        <div class="col-main">
          <div class="prose">
            <p>简体版超凡娱乐改设置只集中在四个类别，默认值全部按“第一次进站”的视角来配，不动任何选项也能顺畅读完整个站点。想调也可以，改完立即生效，不涉及额外确认步骤。</p>
          </div>
          <div class="setting-list">
            <article class="setting-card">
              <p class="setting-card__key">01 / 语言</p>
              <h3 class="setting-card__title">简体中文</h3>
              <p class="setting-card__body">站内只有这一个语言分支，不做平行版本。默认即简体，没有可切换项。</p>
            </article>
            <article class="setting-card">
              <p class="setting-card__key">02 / 板块显示顺序</p>
              <h3 class="setting-card__title">按常用程度排列</h3>
              <p class="setting-card__body">起点导航在前，观察报告在末。支持按自己的习惯重排，重排后会在本地保留。</p>
            </article>
            <article class="setting-card">
              <p class="setting-card__key">03 / 信息密度</p>
              <h3 class="setting-card__title">中等偏高，分段优先</h3>
              <p class="setting-card__body">默认一屏一个决策点。若调高密度，段落之间仍保留喘息带，不会把卡片压到贴边。</p>
            </article>
            <article class="setting-card">
              <p class="setting-card__key">04 / 提示开关</p>
              <h3 class="setting-card__title">风险提示与档位标签默认开启</h3>
              <p class="setting-card__body">风险提示可自行关闭，档位标签与规则例外说明始终保留，不提供关闭选项。</p>
            </article>
          </div>
        </div>
        <aside class="col-aside">
          <div class="aside-note aside-note--violet">
            <p class="aside-note__label">与教程页的分工</p>
            <p class="aside-note__body">本页只说明四类设置的取向与初值。具体到每一步怎么点、在哪一项下修改，归入使用教程页的固定路径。</p>
            <p class="aside-note__link"><a href="/tutorial/">去看五步路径</a></p>
          </div>
        </aside>
      </div>
    </section>

    <section class="chapter" id="sect-rhythm" data-chapter data-reveal>
      <p class="chapter__mark">
        <span class="chapter__index">05</span>
        <span class="chapter__band" aria-hidden="true"></span>
        <span class="chapter__note">更新与复核</span>
      </p>
      <h2 class="chapter__title">运营节奏与复核习惯</h2>
      <div class="grid-12">
        <div class="col-main">
          <figure class="media-figure media-figure--narrow">
            <div class="media-frame">
              <img src="{zhanqunpic:h:900w:900}" width="900" height="900" alt="两个不同半径的同心圆环，环上有均匀分布的光点，象征周与月的更新周期" loading="lazy" decoding="async">
            </div>
            <figcaption class="media-frame__caption">周与月两种节奏叠加：外环为周更新，内环为月更新。</figcaption>
          </figure>
        </div>
        <aside class="col-aside">
          <ul class="rhythm-list">
            <li>
              <span class="rhythm-list__num">每周</span>
              <p>规则卡片更新一次，口径与活动中心首屏同步，避免两处说法出现偏差。</p>
            </li>
            <li>
              <span class="rhythm-list__num">每月</span>
              <p>观察报告主报告出刊一期，三个系列轮流排布，累计已达 74 期。</p>
            </li>
            <li>
              <span class="rhythm-list__num">每季度</span>
              <p>首次进站引导数据复核一次，统计口径为首次进站会话。</p>
            </li>
            <li>
              <span class="rhythm-list__num">每年度</span>
              <p>板块划分与条目总量整体回看一次，判断结构是否仍匹配使用路径。</p>
            </li>
          </ul>
          <div class="aside-note aside-note--cyan">
            <p class="aside-note__label">数据口径</p>
            <p class="aside-note__body">首次进站引导累计服务 96 万人次<span class="ref-mark" data-ref="口径：首次进站会话，每季度复核" tabindex="0" aria-label="查看数据口径">?</span>，按季度复核并统一更新。</p>
          </div>
        </aside>
      </div>
    </section>

    <section class="chapter" id="sect-boundary" data-chapter data-reveal>
      <p class="chapter__mark">
        <span class="chapter__index">06</span>
        <span class="chapter__band" aria-hidden="true"></span>
        <span class="chapter__note">不做什么</span>
      </p>
      <h2 class="chapter__title">内容边界</h2>
      <p class="section-lead">三条底线固定不变。它们决定了站内所有页面的写作方式，也决定了哪些信息不会出现在这里。</p>
      <ul class="boundary-list">
        <li>
          <span class="boundary-list__mark">不做保证</span>
          <p>不给任何结论式承诺，也不对结果做预期。规则说明只描述条件、流程与例外。</p>
        </li>
        <li>
          <span class="boundary-list__mark">不发临时数</span>
          <p>未经统一口径的数字不发布。条目总数、期数、版本号一律以站内核对后的表述为准。</p>
        </li>
        <li>
          <span class="boundary-list__mark">不借人物</span>
          <p>不使用具名人物作为内容背书。所有说明依据站内规则与条目本身，不引外部证言。</p>
        </li>
      </ul>
      <p class="boundary-foot">想进一步确认结构与口径，可以顺序阅读 <a href="/products/">玩法与板块</a>、<a href="/reports/">观察报告</a>、<a href="/tutorial/">使用教程</a>；需要就具体问题沟通，请走 <a href="/reach-us/">联系入口</a>。</p>
    </section>
  </div>
</main>

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}

.page-about .rhythm-list li {
  padding: 14px 16px 16px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--about-panel);
}

.page-about .rhythm-list__num {
  display: inline-block;
  margin-bottom: 8px;
  padding: 2px 9px;
  border: 1px solid rgba(255, 179, 71, 0.38);
  border-radius: 999px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--gold);
}

.page-about .rhythm-list p {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--muted);
}

.page-about .boundary-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

.page-about .boundary-list li {
  padding-top: 16px;
  border-top: 2px solid var(--pink);
}

.page-about .boundary-list li:nth-child(2) {
  border-top-color: var(--gold);
}

.page-about .boundary-list li:nth-child(3) {
  border-top-color: var(--violet);
}

.page-about .boundary-list__mark {
  display: block;
  margin-bottom: 10px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--pink);
  text-transform: uppercase;
}

.page-about .boundary-list li:nth-child(2) .boundary-list__mark {
  color: var(--gold);
}

.page-about .boundary-list li:nth-child(3) .boundary-list__mark {
  color: var(--violet);
}

.page-about .boundary-list p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.82;
  color: var(--text);
}

.page-about .boundary-foot {
  margin: 32px 0 0;
  padding-top: 20px;
  border-top: 1px solid var(--line);
  font-size: 14px;
  line-height: 1.85;
  color: var(--muted);
  max-width: 40em;
}

.page-about .boundary-foot a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(58, 240, 220, 0.3);
  padding-bottom: 1px;
}

.page-about .boundary-foot a:hover,
.page-about .boundary-foot a:focus-visible {
  border-bottom-color: var(--cyan);
}

@media (min-width: 720px) {
  .page-about .setting-list {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-about .boundary-list {
    grid-template-columns: repeat(3, 1fr);
    gap: 26px;
  }

  .page-about .timeline {
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
  }

  .page-about .ladder__step:nth-child(2) {
    margin-left: 22px;
  }

  .page-about .ladder__step:nth-child(3) {
    margin-left: 44px;
  }

  .page-about .ladder__step:nth-child(4) {
    margin-left: 66px;
  }

  .page-about .ladder__step:nth-child(5) {
    margin-left: 88px;
  }

  .page-about .ladder__step:nth-child(6) {
    margin-left: 110px;
  }
}

@media (min-width: 960px) {
  .page-about .page-head {
    padding-right: clamp(0px, 12vw, 200px);
  }

  .page-about .chapter__title {
    margin-bottom: 24px;
  }
}

@media (max-width: 719px) {
  .page-about .ladder__step {
    margin-left: 0;
  }

  .page-about .timeline__panel {
    padding-left: 20px;
  }

  .page-about .media-figure--narrow .media-frame {
    max-width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ladder__step,
  .page-about .timeline__toggle,
  .page-about .ref-mark::after {
    transition: none;
  }
}