.page-about {
  --about-rail: 232px;
  --about-gap: 64px;
  position: relative;
  padding-bottom: 120px;
}

/* ---------- 阅读进度条 ---------- */
.page-about .about-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: transparent;
  z-index: 40;
  pointer-events: none;
}
.page-about .about-progress__bar {
  display: block;
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--neon), var(--cyan));
  transition: width .12s linear;
}

/* ---------- 首屏封面 ---------- */
.page-about .about-cover {
  padding-top: 40px;
}
.page-about .about-cover__grid {
  margin-top: 36px;
  align-items: end;
}
.page-about .about-cover__title {
  margin: 14px 0 0;
  line-height: .95;
}
.page-about .about-cover__title em {
  font-style: normal;
  color: var(--neon);
}
.page-about .about-cover__intro {
  margin-top: 28px;
  color: var(--muted);
}
.page-about .about-cover__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}
.page-about .about-cover__aside {
  display: flex;
  flex-direction: column;
  gap: 20px;
}
.page-about .about-cover__media {
  border-radius: var(--radius-card);
}
.page-about .about-cover__facts {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  margin: 0;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  overflow: hidden;
}
.page-about .about-cover__fact {
  background: var(--panel);
  padding: 16px 18px;
  margin: 0;
}
.page-about .about-cover__fact dt {
  margin: 0 0 6px;
  color: var(--muted);
}
.page-about .about-cover__fact dd {
  margin: 0;
  font-size: 1.5rem;
  color: var(--neon);
  line-height: 1.1;
}

/* ---------- 双栏：目录 + 正文 ---------- */
.page-about .about-body {
  display: block;
  margin-top: var(--stack);
}
.page-about .about-toc {
  position: static;
  margin-bottom: 40px;
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  background: var(--panel);
}
.page-about .about-toc__label {
  margin: 0 0 12px;
  color: var(--muted);
}
.page-about .about-toc__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about .about-toc__list a {
  position: relative;
  display: inline-block;
  padding: 4px 0;
  color: var(--muted);
  text-decoration: none;
  font-size: 14px;
  transition: color .15s var(--ease);
}
.page-about .about-toc__list a::before {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  height: 2px;
  width: 0;
  background: var(--neon);
  transition: width .15s var(--ease);
}
.page-about .about-toc__list a:hover,
.page-about .about-toc__list a:focus-visible {
  color: var(--white);
}
.page-about .about-toc__list a:hover::before,
.page-about .about-toc__list a:focus-visible::before {
  width: 100%;
}
.page-about .about-toc__list a.is-active {
  color: var(--neon);
}
.page-about .about-toc__list a.is-active::before {
  width: 100%;
}

/* ---------- 章节通用 ---------- */
.page-about .about-chapter {
  padding-bottom: var(--stack);
}
.page-about .about-chapter--last {
  padding-bottom: 0;
}
.page-about .about-chapter .marker {
  margin-bottom: 18px;
}
.page-about .about-chapter .section-title {
  margin: 0 0 24px;
  font-family: var(--font-head);
  font-size: clamp(1.9rem, 4.2vw, 2.9rem);
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.1;
  color: var(--white);
}
.page-about .about-chapter__prose p + p {
  margin-top: 18px;
}
.page-about .about-chapter__lead {
  margin-bottom: 28px;
  color: var(--muted);
}

/* ---------- 横向数据带 ---------- */
.page-about .about-strip {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: 36px 0 0;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  overflow: hidden;
}
.page-about .about-strip__item {
  background: var(--panel);
  padding: 16px 18px;
  margin: 0;
}
.page-about .about-strip__item dt {
  margin: 0 0 8px;
  color: var(--muted);
}
.page-about .about-strip__item dd {
  margin: 0;
  color: var(--neon);
  font-size: 1rem;
  line-height: 1.4;
}

/* ---------- 指标折叠注释 ---------- */
.page-about .about-notes {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  overflow: hidden;
  margin-top: 8px;
}
.page-about .about-note {
  background: var(--panel);
}
.page-about .about-note summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 16px;
  padding: 18px 20px;
  cursor: pointer;
  list-style: none;
  transition: background .15s var(--ease);
}
.page-about .about-note summary::-webkit-details-marker {
  display: none;
}
.page-about .about-note summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-data);
  color: var(--muted);
  font-size: 1.1rem;
  line-height: 1;
}
.page-about .about-note[open] summary::after {
  content: "–";
  color: var(--neon);
}
.page-about .about-note summary:hover {
  background: rgba(182, 255, 59, .05);
}
.page-about .about-note summary:focus-visible {
  outline: 2px solid var(--neon);
  outline-offset: -2px;
}
.page-about .about-note__key {
  font-size: 1.05rem;
  color: var(--white);
  letter-spacing: 0;
}
.page-about .about-note[open] .about-note__key {
  color: var(--neon);
}
.page-about .about-note__hint {
  color: var(--muted);
}
.page-about .about-note__body {
  padding: 0 20px 20px;
  border-top: 1px solid var(--line);
  margin-top: 0;
  padding-top: 16px;
}
.page-about .about-notes__foot {
  margin: 14px 0 0;
  color: var(--muted);
}

/* ---------- 三道检查流程 ---------- */
.page-about .about-flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  overflow: hidden;
}
.page-about .about-flow__step {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 16px;
  background: var(--panel);
  padding: 22px 20px;
  position: relative;
}
.page-about .about-flow__step::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--line);
}
.page-about .about-flow__step:hover::before {
  background: var(--neon);
}
.page-about .about-flow__no {
  font-size: .95rem;
  color: var(--yellow);
  padding-top: 4px;
}
.page-about .about-flow__title {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--white);
  letter-spacing: 0;
}
.page-about .about-flow__text p {
  margin: 0;
  color: var(--muted);
  font-size: 15.5px;
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  align-items: start;
  gap: 32px;
}
.page-about .about-team__media .media-frame {
  border-radius: var(--radius-card);
}
.page-about .about-team__stats {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: 26px 0 0;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  overflow: hidden;
}
.page-about .about-team__stats > div {
  background: var(--ink);
  padding: 14px 16px;
}
.page-about .about-team__stats dt {
  margin: 0 0 6px;
  color: var(--muted);
}
.page-about .about-team__stats dd {
  margin: 0;
  color: var(--cyan);
  font-size: 1rem;
}

/* ---------- 能力演进时间线 ---------- */
.page-about .about-timeline {
  margin-top: 8px;
}
.page-about .about-timeline__svg {
  display: none;
}
.page-about .about-timeline__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
}
.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 26px 28px;
  border-left: 1px solid var(--line);
}
.page-about .about-timeline__item:last-child {
  border-left-color: transparent;
  padding-bottom: 0;
}
.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 6px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--neon);
}
.page-about .about-timeline__node {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 16px;
  text-decoration: none;
  color: var(--white);
}
.page-about .about-timeline__season {
  color: var(--neon);
  font-size: 1.1rem;
}
.page-about .about-timeline__name {
  font-family: var(--font-head);
  font-size: 1.15rem;
  font-weight: 700;
  border-bottom: 1px solid transparent;
  transition: border-color .15s var(--ease);
}
.page-about .about-timeline__node:hover .about-timeline__name,
.page-about .about-timeline__node:focus-visible .about-timeline__name {
  border-bottom-color: var(--neon);
}
.page-about .about-timeline__node:focus-visible {
  outline: 2px solid var(--neon);
  outline-offset: 4px;
}
.page-about .about-timeline__desc {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 15.5px;
  scroll-margin-top: 120px;
}
.page-about .about-evo__media {
  margin-top: 36px;
  border-radius: var(--radius-card);
}

/* ---------- 服务时效 ---------- */
.page-about .about-promise {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  margin-top: 32px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  overflow: hidden;
}
.page-about .about-promise__item {
  background: var(--panel);
  padding: 22px 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.page-about .about-promise__num {
  font-size: clamp(1.7rem, 5vw, 2.4rem);
  color: var(--neon);
  line-height: 1;
}
.page-about .about-promise__item:nth-child(2) .about-promise__num {
  color: var(--cyan);
}
.page-about .about-promise__item:nth-child(3) .about-promise__num {
  color: var(--yellow);
}
.page-about .about-promise__label {
  color: var(--muted);
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  margin-top: 44px;
  padding: 28px 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius-panel);
  background:
    radial-gradient(circle at 88% 8%, rgba(182, 255, 59, .1), transparent 62%),
    var(--panel);
}
.page-about .about-next__text {
  margin: 0 0 22px;
  color: var(--white);
}
.page-about .about-next__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 平板及以上 ---------- */
@media (min-width: 768px) {
  .page-about .about-strip {
    grid-template-columns: repeat(3, 1fr);
  }
  .page-about .about-team__stats {
    grid-template-columns: repeat(3, 1fr);
  }
  .page-about .about-promise {
    grid-template-columns: repeat(4, 1fr);
  }
  .page-about .about-toc__list {
    gap: 8px 22px;
  }
}

/* ---------- 桌面：左侧粘性目录 ---------- */
@media (min-width: 1024px) {
  .page-about .about-body {
    display: grid;
    grid-template-columns: var(--about-rail) 1fr;
    gap: var(--about-gap);
    align-items: start;
  }
  .page-about .about-toc {
    position: sticky;
    top: 104px;
    margin-bottom: 0;
    padding: 22px 20px;
  }
  .page-about .about-toc__list {
    flex-direction: column;
    gap: 2px;
  }
  .page-about .about-toc__list li {
    border-bottom: 1px solid var(--line);
  }
  .page-about .about-toc__list li:last-child {
    border-bottom-color: transparent;
  }
  .page-about .about-toc__list a {
    display: block;
    padding: 9px 0 9px 14px;
    font-size: 14px;
  }
  .page-about .about-toc__list a::before {
    left: 0;
    bottom: 50%;
    transform: translateY(50%);
    height: 14px;
    width: 2px;
  }
  .page-about .about-toc__list a:hover::before,
  .page-about .about-toc__list a:focus-visible::before,
  .page-about .about-toc__list a.is-active::before {
    width: 2px;
  }
  .page-about .about-chapter {
    padding-bottom: calc(var(--stack) * 1.1);
  }
  .page-about .about-timeline__svg {
    display: block;
    width: 100%;
    height: 120px;
    margin-bottom: 28px;
  }
  .page-about .about-timeline__list {
    grid-template-columns: repeat(4, 1fr);
    gap: 0 20px;
  }
  .page-about .about-timeline__item {
    border-left: none;
    border-top: 1px solid var(--line);
    padding: 22px 0 0 0;
  }
  .page-about .about-timeline__item::before {
    left: 0;
    top: -5px;
  }
  .page-about .about-timeline__item:last-child {
    border-top-color: var(--line);
  }
  .page-about .about-flow__step {
    grid-template-columns: 64px 1fr;
    padding: 26px 28px;
  }
  .page-about .about-cover {
    padding-top: 56px;
  }
  .page-about .about-cover__facts {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1280px) {
  .page-about .about-cover__grid {
    gap: 56px;
  }
  .page-about .about-team {
    gap: 48px;
  }
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-progress__bar,
  .page-about .about-toc__list a,
  .page-about .about-toc__list a::before,
  .page-about .about-note summary,
  .page-about .about-timeline__name {
    transition: none !important;
  }
}
</｜｜DSML｜｜ parameter>
</｜｜DSML｜｜ invoke>
</｜｜DSML｜｜ calls>