.page-about {
  --ab-gap: clamp(18px, 3vw, 32px);
  --ab-rail: 30px;
  --ab-card: linear-gradient(165deg, rgba(11, 34, 61, 0.96), rgba(7, 20, 38, 0.9));
  --ab-line: rgba(31, 59, 87, 0.9);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(22px, 4vw, 44px) clamp(44px, 7vw, 88px);
  background:
    radial-gradient(120% 90% at 88% -10%, rgba(33, 230, 255, 0.16), transparent 62%),
    radial-gradient(90% 70% at 6% 108%, rgba(255, 122, 26, 0.12), transparent 66%);
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.55;
  background-image:
    linear-gradient(to right, var(--ab-line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--ab-line) 1px, transparent 1px);
  background-size: 52px 52px;
  -webkit-mask-image: radial-gradient(72% 68% at 72% 28%, #000 0%, transparent 76%);
  mask-image: radial-gradient(72% 68% at 72% 28%, #000 0%, transparent 76%);
}

.page-about .ab-hero__inner {
  position: relative;
  display: grid;
  gap: clamp(26px, 4vw, 48px);
  align-items: center;
}

.page-about .ab-hero__text {
  min-width: 0;
}

.page-about .ab-hero__title {
  margin: 14px 0 0;
  font-size: clamp(48px, 12vw, 104px);
  font-weight: 800;
  line-height: 0.92;
  letter-spacing: 0.02em;
  color: var(--bw-silver);
}

.page-about .ab-hero__title::after {
  content: "";
  display: block;
  width: clamp(64px, 13vw, 128px);
  height: 8px;
  margin-top: 20px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--bw-cyan), var(--bw-orange));
  transform: skewX(-14deg);
}

.page-about .ab-hero__lead {
  margin-top: clamp(18px, 3vw, 26px);
  max-width: 34em;
  color: var(--bw-text-soft);
}

.page-about .ab-years {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: clamp(22px, 3vw, 32px);
}

.page-about .ab-year {
  display: inline-flex;
  align-items: center;
  padding: 8px 15px;
  border: 1px solid var(--bw-grid);
  border-radius: 999px;
  font-family: var(--bw-font-mono);
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--bw-mist);
  text-decoration: none;
  transition: background-color 0.2s var(--bw-ease), color 0.2s var(--bw-ease),
    border-color 0.2s var(--bw-ease);
}

.page-about .ab-year:hover,
.page-about .ab-year:focus-visible {
  background-color: var(--bw-cyan);
  border-color: var(--bw-cyan);
  color: var(--bw-ink);
}

.page-about .ab-hero__figure {
  margin: 0;
  overflow: hidden;
  border-radius: var(--bw-radius);
  border: 1px solid var(--bw-grid);
}

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

/* ---------- 版本阶段时间轴 ---------- */
.page-about .ab-stages {
  position: relative;
}

.page-about .ab-stages__head {
  max-width: 46em;
}

.page-about .ab-stages__figure {
  margin: clamp(26px, 4vw, 44px) 0 clamp(28px, 4vw, 48px);
  border-radius: var(--bw-radius);
  overflow: hidden;
  border: 1px solid var(--bw-grid);
}

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

.page-about .ab-timeline {
  position: relative;
  display: grid;
  gap: clamp(20px, 3vw, 34px);
  padding-left: var(--ab-rail);
}

.page-about .ab-timeline::before {
  content: "";
  position: absolute;
  top: 10px;
  bottom: 10px;
  left: calc(var(--ab-rail) / 2 - 1px);
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(
    to bottom,
    var(--bw-cyan) 0%,
    rgba(33, 230, 255, 0.28) 55%,
    var(--bw-orange) 100%
  );
}

.page-about .ab-stage {
  position: relative;
  display: grid;
  gap: 10px;
}

.page-about .ab-stage::before {
  content: "";
  position: absolute;
  top: 10px;
  left: calc(var(--ab-rail) / -2 - 6px);
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--bw-deep);
  border: 2px solid var(--bw-cyan);
  transition: background-color 0.2s var(--bw-ease), border-color 0.2s var(--bw-ease),
    transform 0.2s var(--bw-ease);
}

.page-about .ab-stage:nth-child(4)::before {
  border-color: var(--bw-orange);
}

.page-about .ab-stage:hover::before,
.page-about .ab-stage:focus-within::before {
  background-color: var(--bw-cyan);
  transform: scale(1.18);
}

.page-about .ab-stage:nth-child(4):hover::before,
.page-about .ab-stage:nth-child(4):focus-within::before {
  background-color: var(--bw-orange);
}

.page-about .ab-stage__year {
  margin: 0;
  font-family: var(--bw-font-mono);
  font-size: clamp(26px, 5vw, 38px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--bw-cyan);
}

.page-about .ab-stage:nth-child(4) .ab-stage__year {
  color: var(--bw-orange);
}

.page-about .ab-stage__card {
  padding: clamp(16px, 2.4vw, 26px);
  border: 1px solid var(--bw-grid);
  border-radius: var(--bw-radius);
  background: var(--ab-card);
  transition: border-color 0.2s var(--bw-ease), transform 0.2s var(--bw-ease),
    box-shadow 0.2s var(--bw-ease);
}

.page-about .ab-stage:hover .ab-stage__card,
.page-about .ab-stage:focus-within .ab-stage__card {
  border-color: var(--bw-cyan);
  transform: translateY(-2px);
  box-shadow: 0 22px 44px -30px rgba(33, 230, 255, 0.8);
}

.page-about .ab-stage:nth-child(4):hover .ab-stage__card,
.page-about .ab-stage:nth-child(4):focus-within .ab-stage__card {
  border-color: var(--bw-orange);
  box-shadow: 0 22px 44px -30px rgba(255, 122, 26, 0.8);
}

.page-about .ab-stage__title {
  margin: 12px 0 8px;
  font-size: clamp(19px, 2.6vw, 23px);
  font-weight: 800;
  line-height: 1.35;
  letter-spacing: 0.01em;
  color: var(--bw-silver);
}

.page-about .ab-stage__text {
  margin: 0;
  max-width: 38em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--bw-text-soft);
}

.page-about .ab-stage__link {
  display: inline-block;
  margin-top: 14px;
  font-size: 14px;
}

/* ---------- 团队协作 ---------- */
.page-about .ab-team {
  position: relative;
  background:
    linear-gradient(180deg, rgba(11, 34, 61, 0.55), rgba(7, 20, 38, 0)) ,
    radial-gradient(80% 60% at 0% 0%, rgba(33, 230, 255, 0.08), transparent 70%);
}

.page-about .ab-team__inner {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
  align-items: start;
}

.page-about .ab-team__figure {
  margin: 0;
  border-radius: var(--bw-radius);
  overflow: hidden;
  border: 1px solid var(--bw-grid);
}

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

.page-about .ab-team__body {
  min-width: 0;
}

.page-about .ab-team__body .bw-title {
  margin-top: 10px;
}

.page-about .ab-team__body .bw-prose {
  margin-top: 16px;
  max-width: 36em;
}

.page-about .ab-roles {
  display: grid;
  gap: 14px;
  margin-top: clamp(22px, 3vw, 30px);
}

.page-about .ab-role {
  padding: 16px 18px;
  border-left: 3px solid var(--bw-cyan);
  border-radius: 0 10px 10px 0;
  background: rgba(11, 34, 61, 0.72);
}

.page-about .ab-role:nth-child(3) {
  border-left-color: var(--bw-orange);
}

.page-about .ab-role__num {
  margin: 0;
  font-family: var(--bw-font-mono);
  font-size: 24px;
  font-weight: 700;
  line-height: 1;
  color: var(--bw-cyan);
}

.page-about .ab-role:nth-child(3) .ab-role__num {
  color: var(--bw-orange);
}

.page-about .ab-role__name {
  margin: 6px 0 4px;
  font-size: 16px;
  font-weight: 800;
  letter-spacing: 0.02em;
  color: var(--bw-silver);
}

.page-about .ab-role__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--bw-gray);
}

.page-about .ab-team__more {
  margin: 20px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--bw-text-soft);
}

.page-about .ab-inline-link {
  color: var(--bw-mist);
  text-decoration: none;
  border-bottom: 1px solid rgba(169, 247, 255, 0.45);
  transition: color 0.2s var(--bw-ease), border-color 0.2s var(--bw-ease),
    background-color 0.2s var(--bw-ease);
}

.page-about .ab-inline-link:hover,
.page-about .ab-inline-link:focus-visible {
  color: var(--bw-ink);
  background-color: var(--bw-cyan);
  border-color: var(--bw-cyan);
}

/* ---------- 用户场景 ---------- */
.page-about .ab-usage {
  position: relative;
}

.page-about .ab-usage__head {
  max-width: 46em;
}

.page-about .ab-usage__stats {
  display: grid;
  gap: var(--ab-gap);
  margin-top: clamp(24px, 4vw, 36px);
}

.page-about .ab-stat {
  padding: clamp(18px, 2.6vw, 26px);
  border-radius: var(--bw-radius);
  border: 1px solid var(--bw-grid);
  background: var(--ab-card);
  position: relative;
  overflow: hidden;
}

.page-about .ab-stat::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 54%;
  height: 3px;
  background: linear-gradient(90deg, var(--bw-cyan), transparent);
}

.page-about .ab-stat--accent::after {
  background: linear-gradient(90deg, var(--bw-orange), transparent);
}

.page-about .ab-stat__num {
  margin: 0;
  font-size: clamp(34px, 7vw, 54px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--bw-cyan);
}

.page-about .ab-stat--accent .ab-stat__num {
  color: var(--bw-orange);
}

.page-about .ab-stat__label {
  margin: 10px 0 0;
  max-width: 22em;
  font-size: 14px;
  line-height: 1.75;
  color: var(--bw-text-soft);
}

.page-about .ab-scenes {
  display: grid;
  gap: var(--ab-gap);
  margin-top: clamp(26px, 4vw, 42px);
}

.page-about .ab-scene {
  padding: 18px 20px 20px;
  border: 1px solid var(--bw-grid);
  border-radius: var(--bw-radius);
  background: rgba(11, 34, 61, 0.5);
  transition: border-color 0.2s var(--bw-ease), background-color 0.2s var(--bw-ease);
}

.page-about .ab-scene:hover,
.page-about .ab-scene:focus-within {
  border-color: var(--bw-cyan);
  background: rgba(11, 34, 61, 0.86);
}

.page-about .ab-scene__no {
  margin: 0;
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--bw-gray);
}

.page-about .ab-scene__title {
  margin: 8px 0 8px;
  font-size: 17px;
  font-weight: 800;
  letter-spacing: 0.02em;
  color: var(--bw-silver);
}

.page-about .ab-scene__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--bw-text-soft);
}

/* ---------- 服务与联系 ---------- */
.page-about .ab-reach {
  position: relative;
  overflow: hidden;
}

.page-about .ab-reach::before {
  content: "";
  position: absolute;
  right: -12%;
  bottom: -30%;
  width: 62%;
  height: 90%;
  border-radius: 46% 54% 58% 42%;
  background: radial-gradient(circle at 50% 50%, rgba(33, 230, 255, 0.16), transparent 68%);
  pointer-events: none;
}

.page-about .ab-reach__inner {
  position: relative;
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  align-items: start;
}

.page-about .ab-reach__title {
  margin-top: 10px;
  max-width: 20em;
}

.page-about .ab-reach__text .bw-prose {
  margin-top: 16px;
  max-width: 36em;
}

.page-about .ab-reach__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 30px);
}

.page-about .ab-reach__panel {
  padding: clamp(20px, 3vw, 28px);
  border: 1px solid var(--bw-grid);
  border-radius: var(--bw-radius);
  background: var(--ab-card);
  border-top: 3px solid var(--bw-orange);
}

.page-about .ab-reach__panelTitle {
  margin: 0 0 16px;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--bw-mist);
}

.page-about .ab-reach__list {
  margin: 0;
  display: grid;
  gap: 14px;
}

.page-about .ab-reach__item {
  display: grid;
  gap: 4px;
  padding-bottom: 12px;
  border-bottom: 1px solid rgba(31, 59, 87, 0.7);
}

.page-about .ab-reach__item:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-about .ab-reach__item dt {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--bw-gray);
}

.page-about .ab-reach__item dd {
  margin: 0;
  font-family: var(--bw-font-mono);
  font-size: 15px;
  line-height: 1.6;
  color: var(--bw-silver);
  word-break: break-word;
}

.page-about .ab-reach__note {
  margin: 18px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--bw-gray);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .ab-usage__stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .ab-scenes {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-about .ab-timeline {
    --ab-rail: 46px;
  }

  .page-about .ab-stage {
    grid-template-columns: 108px minmax(0, 1fr);
    align-items: start;
    gap: clamp(16px, 3vw, 30px);
  }

  .page-about .ab-stage__year {
    padding-top: 14px;
    text-align: right;
  }
}

@media (min-width: 900px) {
  .page-about .ab-hero__inner {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
  }

  .page-about .ab-team__inner {
    grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
    align-items: center;
  }

  .page-about .ab-roles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 12px;
  }

  .page-about .ab-scenes {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .ab-scenes .ab-scene:nth-child(2) {
    transform: translateY(16px);
  }

  .page-about .ab-reach__inner {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-year,
  .page-about .ab-stage::before,
  .page-about .ab-stage__card,
  .page-about .ab-scene,
  .page-about .ab-inline-link {
    transition: none;
  }

  .page-about .ab-stage:hover .ab-stage__card,
  .page-about .ab-stage:focus-within .ab-stage__card,
  .page-about .ab-scenes .ab-scene:nth-child(2) {
    transform: none;
  }
}

<main id="main-content" class="page-about">
  <section class="bw-section ab-hero">
    <div class="bw-shell ab-hero__inner">
      <div class="ab-hero__text">
        <nav class="bw-crumbs" aria-label="页面位置">
          <a class="bw-crumbs__item" href="/">首页</a>
          <span class="bw-crumbs__item" aria-current="page">品牌档案</span>
        </nav>
        <p class="bw-kicker">2019 年至今 · 四个版本阶段</p>
        <h1 class="ab-hero__title">品牌档案</h1>
        <p class="bw-lead ab-hero__lead">8天生赢家中心从 2019 年的一份中文说明起步，今天承载官方首页直达、功能说明、版本记录与帮助入口的完整访问路径。这份档案按时间展开：每个阶段用户碰上什么难处，我们又把产品和内容改成了什么样。</p>
        <div class="ab-years" role="navigation" aria-label="跳到版本阶段">
          <a class="ab-year" href="#stage-2019" data-toc-link>2019 初版</a>
          <a class="ab-year" href="#stage-2021" data-toc-link>2021 栏目化</a>
          <a class="ab-year" href="#stage-2023" data-toc-link>2023 多端</a>
          <a class="ab-year" href="#stage-2025" data-toc-link>2025 V3.1</a>
        </div>
      </div>
      <figure class="bw-media bw-media--tilt bw-media--glow ab-hero__figure">
        <img src="{zhanqunpic:h:900w:1400}" width="1400" height="900" alt="深色档案夹轮廓与电光青标签交叠的抽象背景">
      </figure>
    </div>
  </section>

  <section class="bw-section ab-stages" id="stages">
    <div class="bw-shell">
      <div class="bw-section__head ab-stages__head">
        <p class="bw-kicker">版本演进</p>
        <h2 class="bw-title">四个阶段，四次把路修短</h2>
        <p class="bw-lead">没有哪一次改版是为了换一层皮。下面四个阶段，各自对应一类真实处境，也各自留下了可以量出来的变化。</p>
      </div>

      <figure class="bw-media ab-stages__figure">
        <img src="{zhanqunpic:h:800w:1200}" width="1200" height="800" loading="lazy" decoding="async" alt="横向时间轴上的四个版本节点，以电光青连线标注阶段变化">
      </figure>

      <div class="ab-timeline">
        <article class="ab-stage" id="stage-2019" data-reveal>
          <p class="ab-stage__year">2019</p>
          <div class="ab-stage__card">
            <span class="bw-tag bw-tag--muted">初版上线</span>
            <h3 class="ab-stage__title">把入口、说明和联系方式放进同一处</h3>
            <p class="ab-stage__text">最早一批中文用户手上的材料是零散的：界面在哪、下一步点哪里、出了问题问谁，都得自己拼。第一版内容站做得很朴素——把入口和说明写在一起，让第一次来的人不必靠猜。</p>
          </div>
        </article>

        <article class="ab-stage" id="stage-2021" data-reveal>
          <p class="ab-stage__year">2021</p>
          <div class="ab-stage__card">
            <span class="bw-tag bw-tag--cyan">栏目化帮助</span>
            <h3 class="ab-stage__title">问题多起来之后，先让人找得到</h3>
            <p class="ab-stage__text">问答越积越多，全堆在一页里反而更难翻。这一年帮助内容按问题类型重新归类，每个栏目第一次有了明确用途，访客可以先看分类，再决定读哪一条。</p>
          </div>
        </article>

        <article class="ab-stage" id="stage-2023" data-reveal>
          <p class="ab-stage__year">2023</p>
          <div class="ab-stage__card">
            <span class="bw-tag bw-tag--cyan">多端适配</span>
            <h3 class="ab-stage__title">手机上打开，不该再靠放大和拖动</h3>
            <p class="ab-stage__text">访问设备里手机早早占了多数，页面于是按小屏的阅读节奏重排：关键入口单列成行，说明文字放大到一屏能读完，导航条固定在顶部，往下滑也不会跑掉。</p>
          </div>
        </article>

        <article class="ab-stage" id="stage-2025" data-reveal>
          <p class="ab-stage__year">2025</p>
          <div class="ab-stage__card">
            <span class="bw-tag bw-tag--orange">V3.1</span>
            <h3 class="ab-stage__title">核心路径从五步收到三步</h3>
            <p class="ab-stage__text">K8 切换产品线之后，页面加载更快、访问路径更短。从首页到帮助入口的核心路径由 5 步压缩为 3 步；与上一版本相比，首屏加载中位时间缩短约 35%，移动端弱网环境下的可操作时间缩短约 28%。临时查一条信息，来得及在等电梯的间隙做完。</p>
            <a class="bw-btn bw-btn--link ab-stage__link" href="/notes/">看 V3.1 的完整条目</a>
          </div>
        </article>
      </div>
    </div>
  </section>

  <section class="bw-section ab-team">
    <div class="bw-shell ab-team__inner">
      <figure class="bw-media ab-team__figure" data-reveal>
        <img src="{zhanqunpic:h:700w:1000}" width="1000" height="700" loading="lazy" decoding="async" alt="抽象信息卡、工单节点与协作箭头组成的服务流程图">
      </figure>
      <div class="ab-team__body">
        <p class="bw-kicker">团队协作</p>
        <h2 class="bw-title">内容团队写清楚，客服团队听得见</h2>
        <p class="bw-prose">内容运营团队 12 人，日常维护品牌档案、功能说明、更新笔记与使用指南；客服与帮助中心团队 8 人，在工作日 9:00 至 18:00 处理邮件与工单。两边的关系很直接：工单里反复冒出来的问题，就是下一批该写进指南的条目。</p>
        <div class="ab-roles">
          <div class="ab-role">
            <p class="ab-role__num">12</p>
            <h3 class="ab-role__name">内容运营</h3>
            <p class="ab-role__text">负责档案、功能、笔记与指南的撰写和更新，把改动落到具体页面上。</p>
          </div>
          <div class="ab-role">
            <p class="ab-role__num">8</p>
            <h3 class="ab-role__name">客服与帮助中心</h3>
            <p class="ab-role__text">工作日受理邮件与工单，紧急问题转交处理队列，并把高频困扰反馈给内容侧。</p>
          </div>
          <div class="ab-role">
            <p class="ab-role__num">4–6</p>
            <h3 class="ab-role__name">每月更新条目</h3>
            <p class="ab-role__text">更新笔记保持每周至少一条、每月四到六条的节奏，选题多数来自真实咨询。</p>
          </div>
        </div>
        <p class="ab-team__more">功能模块怎么划分、分别解决什么问题，都在<a class="ab-inline-link" href="/features/">功能中心</a>里逐项写明。</p>
      </div>
    </div>
  </section>

  <section class="bw-section ab-usage">
    <div class="bw-shell">
      <div class="bw-section__head ab-usage__head">
        <p class="bw-kicker">谁在用，怎么用</p>
        <h2 class="bw-title">七成以上的访问，发生在手机上</h2>
        <p class="bw-lead">访问设备里移动端约占 72%，站内内容覆盖 26 个省级区域的中文用户。这个比例决定了我们做任何调整时的顺序：先看窄屏，只要小屏上多一次滑动才能看见，就算多一道门槛。</p>
      </div>

      <div class="ab-usage__stats">
        <div class="ab-stat">
          <p class="bw-mono ab-stat__num">72%</p>
          <p class="ab-stat__label">访问来自移动端，页面按小屏阅读节奏组织</p>
        </div>
        <div class="ab-stat ab-stat--accent">
          <p class="bw-mono ab-stat__num">26</p>
          <p class="ab-stat__label">个省级区域的用户通过这里进入官网</p>
        </div>
      </div>

      <div class="ab-scenes">
        <article class="ab-scene">
          <p class="ab-scene__no bw-mono">01</p>
          <h3 class="ab-scene__title">赶时间的人</h3>
          <p class="ab-scene__text">只想确认一条具体信息，最好一次点到位。固定的导航条和直达入口就是为了这一下。</p>
        </article>
        <article class="ab-scene">
          <p class="ab-scene__no bw-mono">02</p>
          <h3 class="ab-scene__title">核对版本的人</h3>
          <p class="ab-scene__text">先看清当前是哪个版本，再决定往哪走。版本条目里写了变更摘要和受影响的页面。</p>
        </article>
        <article class="ab-scene">
          <p class="ab-scene__no bw-mono">03</p>
          <h3 class="ab-scene__title">第一次来的人</h3>
          <p class="ab-scene__text">先摸清导航条在哪、帮助入口在哪，再慢慢往下看。指南按入门顺序排好了先后。</p>
        </article>
      </div>
    </div>
  </section>

  <section class="bw-section ab-reach" id="reach">
    <div class="bw-shell ab-reach__inner">
      <div class="ab-reach__text">
        <p class="bw-kicker">服务与联系</p>
        <h2 class="bw-title ab-reach__title">工作日的九点到六点，电话和邮箱都有人处理</h2>
        <p class="bw-prose">邮件与工单在工作日 9:00 至 18:00 之间处理。碰上卡住进不去的情况，优先通过帮助中心提交工单，处理顺序会排在普通咨询之前，也能把问题原样带到对应的人手上。</p>
        <div class="ab-reach__actions">
          <a class="bw-btn bw-btn--primary" href="/contact/">联系我们</a>
          <a class="bw-btn bw-btn--ghost" href="/guide/">去帮助中心</a>
        </div>
      </div>
      <div class="ab-reach__panel">
        <p class="ab-reach__panelTitle">直接找到人</p>
        <dl class="ab-reach__list">
          <div class="ab-reach__item">
            <dt>客服邮箱</dt>
            <dd>kefu@bornwinner-k8.com.cn</dd>
          </div>
          <div class="ab-reach__item">
            <dt>补充咨询</dt>
            <dd>support@bornwinner-k8.com.cn</dd>
          </div>
          <div class="ab-reach__item">
            <dt>客服电话</dt>
            <dd>400-4587-3858</dd>
          </div>
          <div class="ab-reach__item">
            <dt>受理时间</dt>
            <dd>工作日 9:00-18:00</dd>
          </div>
        </dl>
        <p class="ab-reach__note">紧急问题请优先通过帮助中心提交工单，处理会更快一步。</p>
      </div>
    </div>
  </section>
</main>

.page-about {
  --ab-gap: clamp(18px, 3vw, 32px);
  --ab-rail: 30px;
  --ab-card: linear-gradient(165deg, rgba(11, 34, 61, 0.96), rgba(7, 20, 38, 0.9));
  --ab-line: rgba(31, 59, 87, 0.9);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(22px, 4vw, 44px) clamp(44px, 7vw, 88px);
  background:
    radial-gradient(120% 90% at 88% -10%, rgba(33, 230, 255, 0.16), transparent 62%),
    radial-gradient(90% 70% at 6% 108%, rgba(255, 122, 26, 0.12), transparent 66%);
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.55;
  background-image:
    linear-gradient(to right, var(--ab-line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--ab-line) 1px, transparent 1px);
  background-size: 52px 52px;
  -webkit-mask-image: radial-gradient(72% 68% at 72% 28%, #000 0%, transparent 76%);
  mask-image: radial-gradient(72% 68% at 72% 28%, #000 0%, transparent 76%);
}

.page-about .ab-hero__inner {
  position: relative;
  display: grid;
  gap: clamp(26px, 4vw, 48px);
  align-items: center;
}

.page-about .ab-hero__text {
  min-width: 0;
}

.page-about .ab-hero__title {
  margin: 14px 0 0;
  font-size: clamp(48px, 12vw, 104px);
  font-weight: 800;
  line-height: 0.92;
  letter-spacing: 0.02em;
  color: var(--bw-silver);
}

.page-about .ab-hero__title::after {
  content: "";
  display: block;
  width: clamp(64px, 13vw, 128px);
  height: 8px;
  margin-top: 20px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--bw-cyan), var(--bw-orange));
  transform: skewX(-14deg);
}

.page-about .ab-hero__lead {
  margin-top: clamp(18px, 3vw, 26px);
  max-width: 34em;
  color: var(--bw-text-soft);
}

.page-about .ab-years {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: clamp(22px, 3vw, 32px);
}

.page-about .ab-year {
  display: inline-flex;
  align-items: center;
  padding: 8px 15px;
  border: 1px solid var(--bw-grid);
  border-radius: 999px;
  font-family: var(--bw-font-mono);
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--bw-mist);
  text-decoration: none;
  transition: background-color 0.2s var(--bw-ease), color 0.2s var(--bw-ease),
    border-color 0.2s var(--bw-ease);
}

.page-about .ab-year:hover,
.page-about .ab-year:focus-visible {
  background-color: var(--bw-cyan);
  border-color: var(--bw-cyan);
  color: var(--bw-ink);
}

.page-about .ab-hero__figure {
  margin: 0;
  overflow: hidden;
  border-radius: var(--bw-radius);
  border: 1px solid var(--bw-grid);
}

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

/* ---------- 版本阶段时间轴 ---------- */
.page-about .ab-stages {
  position: relative;
}

.page-about .ab-stages__head {
  max-width: 46em;
}

.page-about .ab-stages__figure {
  margin: clamp(26px, 4vw, 44px) 0 clamp(28px, 4vw, 48px);
  border-radius: var(--bw-radius);
  overflow: hidden;
  border: 1px solid var(--bw-grid);
}

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

.page-about .ab-timeline {
  position: relative;
  display: grid;
  gap: clamp(20px, 3vw, 34px);
  padding-left: var(--ab-rail);
}

.page-about .ab-timeline::before {
  content: "";
  position: absolute;
  top: 10px;
  bottom: 10px;
  left: calc(var(--ab-rail) / 2 - 1px);
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(
    to bottom,
    var(--bw-cyan) 0%,
    rgba(33, 230, 255, 0.28) 55%,
    var(--bw-orange) 100%
  );
}

.page-about .ab-stage {
  position: relative;
  display: grid;
  gap: 10px;
}

.page-about .ab-stage::before {
  content: "";
  position: absolute;
  top: 10px;
  left: calc(var(--ab-rail) / -2 - 6px);
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--bw-deep);
  border: 2px solid var(--bw-cyan);
  transition: background-color 0.2s var(--bw-ease), border-color 0.2s var(--bw-ease),
    transform 0.2s var(--bw-ease);
}

.page-about .ab-stage:nth-child(4)::before {
  border-color: var(--bw-orange);
}

.page-about .ab-stage:hover::before,
.page-about .ab-stage:focus-within::before {
  background-color: var(--bw-cyan);
  transform: scale(1.18);
}

.page-about .ab-stage:nth-child(4):hover::before,
.page-about .ab-stage:nth-child(4):focus-within::before {
  background-color: var(--bw-orange);
}

.page-about .ab-stage__year {
  margin: 0;
  font-family: var(--bw-font-mono);
  font-size: clamp(26px, 5vw, 38px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--bw-cyan);
}

.page-about .ab-stage:nth-child(4) .ab-stage__year {
  color: var(--bw-orange);
}

.page-about .ab-stage__card {
  padding: clamp(16px, 2.4vw, 26px);
  border: 1px solid var(--bw-grid);
  border-radius: var(--bw-radius);
  background: var(--ab-card);
  transition: border-color 0.2s var(--bw-ease), transform 0.2s var(--bw-ease),
    box-shadow 0.2s var(--bw-ease);
}

.page-about .ab-stage:hover .ab-stage__card,
.page-about .ab-stage:focus-within .ab-stage__card {
  border-color: var(--bw-cyan);
  transform: translateY(-2px);
  box-shadow: 0 22px 44px -30px rgba(33, 230, 255, 0.8);
}

.page-about .ab-stage:nth-child(4):hover .ab-stage__card,
.page-about .ab-stage:nth-child(4):focus-within .ab-stage__card {
  border-color: var(--bw-orange);
  box-shadow: 0 22px 44px -30px rgba(255, 122, 26, 0.8);
}

.page-about .ab-stage__title {
  margin: 12px 0 8px;
  font-size: clamp(19px, 2.6vw, 23px);
  font-weight: 800;
  line-height: 1.35;
  letter-spacing: 0.01em;
  color: var(--bw-silver);
}

.page-about .ab-stage__text {
  margin: 0;
  max-width: 38em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--bw-text-soft);
}

.page-about .ab-stage__link {
  display: inline-block;
  margin-top: 14px;
  font-size: 14px;
}

/* ---------- 团队协作 ---------- */
.page-about .ab-team {
  position: relative;
  background:
    linear-gradient(180deg, rgba(11, 34, 61, 0.55), rgba(7, 20, 38, 0)),
    radial-gradient(80% 60% at 0% 0%, rgba(33, 230, 255, 0.08), transparent 70%);
}

.page-about .ab-team__inner {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
  align-items: start;
}

.page-about .ab-team__figure {
  margin: 0;
  border-radius: var(--bw-radius);
  overflow: hidden;
  border: 1px solid var(--bw-grid);
}

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

.page-about .ab-team__body {
  min-width: 0;
}

.page-about .ab-team__body .bw-title {
  margin-top: 10px;
}

.page-about .ab-team__body .bw-prose {
  margin-top: 16px;
  max-width: 36em;
}

.page-about .ab-roles {
  display: grid;
  gap: 14px;
  margin-top: clamp(22px, 3vw, 30px);
}

.page-about .ab-role {
  padding: 16px 18px;
  border-left: 3px solid var(--bw-cyan);
  border-radius: 0 10px 10px 0;
  background: rgba(11, 34, 61, 0.72);
}

.page-about .ab-role:nth-child(3) {
  border-left-color: var(--bw-orange);
}

.page-about .ab-role__num {
  margin: 0;
  font-family: var(--bw-font-mono);
  font-size: 24px;
  font-weight: 700;
  line-height: 1;
  color: var(--bw-cyan);
}

.page-about .ab-role:nth-child(3) .ab-role__num {
  color: var(--bw-orange);
}

.page-about .ab-role__name {
  margin: 6px 0 4px;
  font-size: 16px;
  font-weight: 800;
  letter-spacing: 0.02em;
  color: var(--bw-silver);
}

.page-about .ab-role__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--bw-gray);
}

.page-about .ab-team__more {
  margin: 20px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--bw-text-soft);
}

.page-about .ab-inline-link {
  color: var(--bw-mist);
  text-decoration: none;
  border-bottom: 1px solid rgba(169, 247, 255, 0.45);
  transition: color 0.2s var(--bw-ease), border-color 0.2s var(--bw-ease),
    background-color 0.2s var(--bw-ease);
}

.page-about .ab-inline-link:hover,
.page-about .ab-inline-link:focus-visible {
  color: var(--bw-ink);
  background-color: var(--bw-cyan);
  border-color: var(--bw-cyan);
}

/* ---------- 用户场景 ---------- */
.page-about .ab-usage {
  position: relative;
}

.page-about .ab-usage__head {
  max-width: 46em;
}

.page-about .ab-usage__stats {
  display: grid;
  gap: var(--ab-gap);
  margin-top: clamp(24px, 4vw, 36px);
}

.page-about .ab-stat {
  position: relative;
  overflow: hidden;
  padding: clamp(18px, 2.6vw, 26px);
  border-radius: var(--bw-radius);
  border: 1px solid var(--bw-grid);
  background: var(--ab-card);
}

.page-about .ab-stat::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 54%;
  height: 3px;
  background: linear-gradient(90deg, var(--bw-cyan), transparent);
}

.page-about .ab-stat--accent::after {
  background: linear-gradient(90deg, var(--bw-orange), transparent);
}

.page-about .ab-stat__num {
  margin: 0;
  font-size: clamp(34px, 7vw, 54px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--bw-cyan);
}

.page-about .ab-stat--accent .ab-stat__num {
  color: var(--bw-orange);
}

.page-about .ab-stat__label {
  margin: 10px 0 0;
  max-width: 22em;
  font-size: 14px;
  line-height: 1.75;
  color: var(--bw-text-soft);
}

.page-about .ab-scenes {
  display: grid;
  gap: var(--ab-gap);
  margin-top: clamp(26px, 4vw, 42px);
}

.page-about .ab-scene {
  padding: 18px 20px 20px;
  border: 1px solid var(--bw-grid);
  border-radius: var(--bw-radius);
  background: rgba(11, 34, 61, 0.5);
  transition: border-color 0.2s var(--bw-ease), background-color 0.2s var(--bw-ease);
}

.page-about .ab-scene:hover,
.page-about .ab-scene:focus-within {
  border-color: var(--bw-cyan);
  background: rgba(11, 34, 61, 0.86);
}

.page-about .ab-scene__no {
  margin: 0;
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--bw-gray);
}

.page-about .ab-scene__title {
  margin: 8px 0;
  font-size: 17px;
  font-weight: 800;
  letter-spacing: 0.02em;
  color: var(--bw-silver);
}

.page-about .ab-scene__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--bw-text-soft);
}

/* ---------- 服务与联系 ---------- */
.page-about .ab-reach {
  position: relative;
  overflow: hidden;
}

.page-about .ab-reach::before {
  content: "";
  position: absolute;
  right: -12%;
  bottom: -30%;
  width: 62%;
  height: 90%;
  border-radius: 46% 54% 58% 42%;
  background: radial-gradient(circle at 50% 50%, rgba(33, 230, 255, 0.16), transparent 68%);
  pointer-events: none;
}

.page-about .ab-reach__inner {
  position: relative;
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  align-items: start;
}

.page-about .ab-reach__title {
  margin-top: 10px;
  max-width: 20em;
}

.page-about .ab-reach__text .bw-prose {
  margin-top: 16px;
  max-width: 36em;
}

.page-about .ab-reach__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 30px);
}

.page-about .ab-reach__panel {
  padding: clamp(20px, 3vw, 28px);
  border: 1px solid var(--bw-grid);
  border-top: 3px solid var(--bw-orange);
  border-radius: var(--bw-radius);
  background: var(--ab-card);
}

.page-about .ab-reach__panelTitle {
  margin: 0 0 16px;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--bw-mist);
}

.page-about .ab-reach__list {
  margin: 0;
  display: grid;
  gap: 14px;
}

.page-about .ab-reach__item {
  display: grid;
  gap: 4px;
  padding-bottom: 12px;
  border-bottom: 1px solid rgba(31, 59, 87, 0.7);
}

.page-about .ab-reach__item:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-about .ab-reach__item dt {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--bw-gray);
}

.page-about .ab-reach__item dd {
  margin: 0;
  font-family: var(--bw-font-mono);
  font-size: 15px;
  line-height: 1.6;
  color: var(--bw-silver);
  word-break: break-word;
}

.page-about .ab-reach__note {
  margin: 18px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--bw-gray);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .ab-usage__stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .ab-scenes {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-about .ab-timeline {
    --ab-rail: 46px;
  }

  .page-about .ab-stage {
    grid-template-columns: 108px minmax(0, 1fr);
    align-items: start;
    gap: clamp(16px, 3vw, 30px);
  }

  .page-about .ab-stage__year {
    padding-top: 14px;
    text-align: right;
  }
}

@media (min-width: 900px) {
  .page-about .ab-hero__inner {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
  }

  .page-about .ab-team__inner {
    grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
    align-items: center;
  }

  .page-about .ab-roles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 12px;
  }

  .page-about .ab-scenes {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .ab-scenes .ab-scene:nth-child(2) {
    transform: translateY(16px);
  }

  .page-about .ab-reach__inner {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-year,
  .page-about .ab-stage::before,
  .page-about .ab-stage__card,
  .page-about .ab-scene,
  .page-about .ab-inline-link {
    transition: none;
  }

  .page-about .ab-stage:hover .ab-stage__card,
  .page-about .ab-stage:focus-within .ab-stage__card,
  .page-about .ab-scenes .ab-scene:nth-child(2) {
    transform: none;
  }
}