.page-about {
  --about-gap: 28px;
  position: relative;
  padding: 0 20px 88px;
  color: var(--paper);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
}

.page-about .shell {
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 22px 0 0;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--muted);
}

.page-about .breadcrumb a {
  color: var(--cyan-300);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .25s var(--ease), border-color .25s var(--ease);
}

.page-about .breadcrumb a:hover {
  color: var(--cyan-400);
  border-bottom-color: var(--cyan-400);
}

.page-about .breadcrumb-sep {
  color: var(--line);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  gap: 32px;
  padding: 30px 0 52px;
  border-bottom: 1px solid var(--line);
}

.page-about h1 {
  margin: 14px 0 0;
  font-size: clamp(36px, 7.2vw, 74px);
  line-height: 1.06;
  letter-spacing: -0.045em;
  font-weight: 800;
  color: var(--paper);
}

.page-about .hero-lede {
  margin: 20px 0 0;
  max-width: 48ch;
  font-size: 17px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .hero-board {
  position: relative;
  padding: 24px 20px 12px;
  border: 1px solid var(--line);
  border-radius: var(--r-card);
  background: linear-gradient(180deg, var(--ink-800), var(--ink-900));
  overflow: hidden;
}

.page-about .hero-board::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan-400), transparent 78%);
}

.page-about .board-list {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
}

.page-about .board-item {
  display: grid;
  gap: 4px;
  padding: 14px 0;
  border-top: 1px dashed var(--line);
}

.page-about .board-item:first-child {
  border-top: 0;
}

.page-about .board-key {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--muted);
}

.page-about .board-val {
  font-size: 15px;
  color: var(--paper);
}

/* ---------- 章节目录 ---------- */
.page-about .about-toc {
  padding: 30px 0 6px;
}

.page-about .toc-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
}

.page-about .toc-list a {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 15px;
  border: 1px solid var(--line);
  border-radius: var(--r-pill);
  font-size: 13px;
  color: var(--muted);
  text-decoration: none;
  transition: color .25s var(--ease), border-color .25s var(--ease), background-color .25s var(--ease);
}

.page-about .toc-list a:hover,
.page-about .toc-list a:focus-visible {
  color: var(--cyan-400);
  border-color: var(--cyan-400);
  background: var(--ink-800);
}

.page-about .toc-num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--cyan-400);
  letter-spacing: .08em;
}

/* ---------- 章节 ---------- */
.page-about .about-chapter {
  position: relative;
  padding: 46px 0 50px;
  border-top: 1px solid var(--line);
}

.page-about .about-chapter::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 64px;
  height: 2px;
  background: var(--cyan-400);
  transition: width .6s var(--ease);
}

.page-about .about-chapter.is-active::before {
  width: 168px;
}

.page-about .chapter-aside {
  margin-bottom: 20px;
}

.page-about .chapter-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(40px, 6.6vw, 74px);
  font-weight: 200;
  line-height: .86;
  letter-spacing: -0.05em;
  color: var(--ink-700);
  transition: color .5s var(--ease);
}

.page-about .about-chapter.is-active .chapter-num {
  color: var(--cyan-400);
}

.page-about .chapter-aside .eyebrow {
  display: block;
  margin-top: 12px;
}

.page-about .chapter-body h2 {
  margin: 0 0 16px;
  font-size: clamp(25px, 3.5vw, 38px);
  line-height: 1.22;
  letter-spacing: -0.03em;
  font-weight: 700;
  color: var(--paper);
}

.page-about .chapter-body h3 {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .chapter-body p {
  margin: 0 0 16px;
  color: var(--muted);
}

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

.page-about .chapter-body a {
  color: var(--cyan-300);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  transition: color .25s var(--ease), border-color .25s var(--ease);
}

.page-about .chapter-body a:hover {
  color: var(--cyan-400);
  border-bottom-color: var(--cyan-400);
}

/* ---------- 图片容器 ---------- */
.page-about .media-frame {
  margin: 24px 0;
  border: 1px solid var(--line);
  border-radius: var(--r-card);
  overflow: hidden;
}

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

.page-about .media-frame figcaption {
  padding: 12px 16px;
  border-top: 1px solid var(--line);
  background: var(--ink-800);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--muted);
}

/* ---------- 分工卡 ---------- */
.page-about .role-grid {
  display: grid;
  gap: 14px;
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
}

.page-about .role-grid li {
  padding: 20px 18px;
  border: 1px solid var(--line);
  border-radius: var(--r-card);
  background: var(--ink-800);
}

.page-about .role-count {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 30px;
  line-height: 1;
  letter-spacing: -0.04em;
  color: var(--cyan-400);
}

.page-about .role-grid p {
  margin: 0;
  font-size: 15px;
}

/* ---------- 流程时间轴 ---------- */
.page-about .flow-list {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
}

.page-about .flow-item {
  position: relative;
  padding: 0 0 30px 28px;
  border-left: 1px solid var(--line);
}

.page-about .flow-item:last-child {
  padding-bottom: 0;
}

.page-about .flow-item::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 7px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 1px solid var(--cyan-400);
}

.page-about .flow-num {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--cyan-400);
}

.page-about .flow-item p {
  margin: 0;
  font-size: 15px;
}

/* ---------- 资料卡 ---------- */
.page-about .doc-grid {
  display: grid;
  gap: 14px;
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
}

.page-about .doc-card {
  padding: 22px 18px;
  border: 1px solid var(--line);
  border-top: 3px solid var(--cyan-400);
  border-radius: 0 0 var(--r-card) var(--r-card);
  background: var(--ink-800);
}

.page-about .doc-card p {
  margin: 0;
  font-size: 15px;
}

.page-about .cadence {
  margin-top: 22px;
  padding: 16px 20px;
  border-left: 3px solid var(--orange-500);
  background: var(--ink-800);
  border-radius: 0 var(--r-card) var(--r-card) 0;
  font-size: 15px;
  color: var(--paper);
}

/* ---------- 覆盖范围 ---------- */
.page-about .coverage-grid {
  display: grid;
  gap: 0;
  list-style: none;
  margin: 24px 0;
  padding: 0;
}

.page-about .coverage-item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: baseline;
  gap: 6px 18px;
  padding: 18px 0;
  border-bottom: 1px dashed var(--line);
}

.page-about .coverage-num {
  font-family: var(--font-mono);
  font-size: clamp(28px, 4vw, 42px);
  line-height: 1;
  letter-spacing: -0.04em;
  color: var(--cyan-400);
}

.page-about .coverage-label {
  font-size: 14px;
  color: var(--muted);
}

/* ---------- 阶段列表 ---------- */
.page-about .stage-list {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
}

.page-about .stage-item {
  padding: 22px 0;
  border-top: 1px solid var(--line);
}

.page-about .stage-item:last-child {
  border-bottom: 1px solid var(--line);
}

.page-about .stage-tag {
  display: inline-block;
  margin-bottom: 10px;
  padding: 3px 10px;
  border: 1px solid var(--line);
  border-radius: var(--r-pill);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--cyan-300);
}

.page-about .stage-item p {
  margin: 0;
  font-size: 15px;
}

/* ---------- 校对清单 ---------- */
.page-about .check-list {
  display: grid;
  gap: 12px;
  list-style: none;
  margin: 22px 0;
  padding: 0;
}

.page-about .check-list li {
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--ink-700);
  border-radius: 0 var(--r-card) var(--r-card) 0;
  background: var(--ink-800);
  transition: border-left-color .35s var(--ease);
}

.page-about .check-list li:hover {
  border-left-color: var(--cyan-400);
}

.page-about .check-list p {
  margin: 0;
  font-size: 15px;
}

/* ---------- 结尾 ---------- */
.page-about .about-outro {
  display: grid;
  gap: 22px;
  margin-top: 44px;
  padding: 38px 24px;
  border: 1px solid var(--line);
  border-radius: var(--r-card);
  background: linear-gradient(140deg, var(--ink-800), var(--ink-950) 72%);
}

.page-about .about-outro h2 {
  margin: 0 0 12px;
  font-size: clamp(22px, 3vw, 30px);
  line-height: 1.25;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-outro p {
  margin: 0;
  font-size: 15px;
  color: var(--muted);
}

.page-about .outro-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 入场动效 ---------- */
.page-about [data-reveal] {
  opacity: 1;
  transform: none;
  transition: opacity .6s var(--ease), transform .6s var(--ease);
}

.js-ready .page-about [data-reveal] {
  opacity: 0;
  transform: translateY(18px);
}

.js-ready .page-about [data-reveal].is-in {
  opacity: 1;
  transform: none;
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about {
    padding: 0 32px 104px;
  }

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

@media (min-width: 900px) {
  .page-about {
    padding: 0 44px 120px;
  }

  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.45fr) minmax(280px, 0.62fr);
    align-items: end;
    gap: 44px;
    padding: 48px 0 72px;
  }

  .page-about .about-chapter {
    display: grid;
    grid-template-columns: 208px minmax(0, 1fr);
    gap: 44px;
    padding: 58px 0 62px;
  }

  .page-about .chapter-aside {
    margin-bottom: 0;
    position: sticky;
    top: 118px;
    align-self: start;
  }

  .page-about .coverage-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0 26px;
  }

  .page-about .coverage-item {
    grid-template-columns: minmax(0, 1fr);
    align-content: start;
  }

  .page-about .about-outro {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    padding: 42px 38px;
  }

  .page-about .outro-actions {
    flex-direction: column;
    align-items: stretch;
    min-width: 208px;
  }
}

@media (min-width: 1200px) {
  .page-about .stage-item {
    display: grid;
    grid-template-columns: 132px minmax(0, 1fr);
    gap: 0 24px;
    align-items: start;
  }

  .page-about .stage-tag {
    margin-bottom: 0;
    justify-self: start;
  }

  .page-about .stage-item h3,
  .page-about .stage-item p {
    grid-column: 2;
  }
}
</｜｜DSML｜｜ parameter>
</｜｜DSML｜｜ invoke>
</｜｜DSML｜｜ calls>