.page-about {
  --about-rail-w: 186px;
  --about-col-gap: 56px;
  --about-hair: rgba(6, 26, 51, .10);
  --about-body: #2E4459;
  --about-soft: #55697E;
  --about-accent: #0A5AC2;
  --about-wash: #EAF2FA;

  display: block;
  padding: 0;
  background: var(--paper);
  color: var(--deep);
}

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: 44px 0 0;
  background: var(--deep);
  color: var(--paper);
}

.page-about .about-hero__aurora {
  position: absolute;
  top: -28%;
  right: -14%;
  width: 680px;
  height: 680px;
  border-radius: 50%;
  background: radial-gradient(circle at 50% 50%, rgba(23, 224, 200, .20), rgba(47, 123, 255, .10) 42%, transparent 70%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(23, 224, 200, .55), transparent);
}

.page-about .about-hero .breadcrumb {
  margin-bottom: 22px;
  color: var(--mist);
  font-size: var(--fs-1);
}

.page-about .about-hero .breadcrumb a {
  color: var(--mist);
  text-decoration: none;
}

.page-about .about-hero .breadcrumb a:hover,
.page-about .about-hero .breadcrumb a:focus-visible {
  color: var(--surge);
}

.page-about .about-hero .eyebrow {
  color: var(--surge);
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 36px;
}

.page-about .about-hero__title {
  margin: 16px 0 0;
  font-size: clamp(32px, 6.4vw, 68px);
  line-height: 1.04;
  letter-spacing: -.026em;
  font-weight: 900;
  color: var(--paper);
  max-width: 15em;
}

.page-about .about-hero__lead {
  margin: 22px 0 0;
  max-width: 620px;
  font-size: var(--fs-3);
  line-height: 1.78;
  color: var(--mist);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.page-about .about-hero__figure {
  margin: 0;
  border-radius: var(--r-l);
  overflow: hidden;
  border: 1px solid var(--line);
  box-shadow: var(--shadow-2);
  background: linear-gradient(150deg, #0B2A4A, #061A33);
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 5 / 3;
}

.page-about .about-hero__stats {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin: 52px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .about-hero__stats li {
  padding: 22px 14px 30px 0;
  border-right: 1px solid var(--line);
}

.page-about .about-hero__stats li:last-child {
  border-right: 0;
}

.page-about .about-hero__stats strong {
  display: block;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(28px, 7vw, 46px);
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--surge);
}

.page-about .about-hero__stats span {
  display: block;
  margin-top: 9px;
  font-size: var(--fs-1);
  line-height: 1.5;
  color: var(--mist);
}

/* ---------- 主体骨架 ---------- */

.page-about .about-body {
  padding: 56px 0 0;
  background: var(--paper);
}

.page-about .about-body__grid {
  display: block;
}

.page-about .about-articles {
  min-width: 0;
}

/* ---------- 章节刻度索引 ---------- */

.page-about .about-rail {
  margin-bottom: 44px;
}

.page-about .about-rail__caption {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: var(--fs-1);
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--about-soft);
}

.page-about .about-rail__list {
  position: relative;
  display: flex;
  gap: 20px;
  margin: 0;
  padding: 0 0 8px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-rail__list::before {
  display: none;
}

.page-about .about-rail__link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 6px 0;
  white-space: nowrap;
  font-size: var(--fs-2);
  color: var(--about-soft);
  text-decoration: none;
  transition: color .2s ease;
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--deep);
}

.page-about .about-rail__tick {
  flex: none;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--paper);
  border: 1px solid var(--line-strong);
  transition: background .2s ease, border-color .2s ease, transform .2s ease;
}

.page-about .about-rail__link:hover .about-rail__tick,
.page-about .about-rail__link:focus-visible .about-rail__tick {
  background: var(--jump);
  border-color: var(--jump);
  transform: scale(1.3);
}

/* ---------- 章节 ---------- */

.page-about .about-sec {
  margin-bottom: 64px;
  scroll-margin-top: 90px;
}

.page-about .about-sec__title {
  margin: 12px 0 0;
  font-size: clamp(25px, 4vw, 38px);
  line-height: 1.14;
  letter-spacing: -.018em;
  font-weight: 900;
  color: var(--deep);
  max-width: 20em;
}

.page-about .about-prose {
  margin-top: 22px;
}

.page-about .about-prose p {
  max-width: 720px;
  margin: 0 0 18px;
  font-size: var(--fs-3);
  line-height: 1.78;
  color: var(--about-body);
}

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

.page-about .about-prose a {
  color: var(--about-accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}

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

/* ---------- 停顿色带 ---------- */

.page-about .about-band {
  position: relative;
  margin: 0 0 64px;
  padding: 26px 0;
  background: var(--deep);
  color: var(--paper);
  overflow: hidden;
}

.page-about .about-band--alt {
  background: linear-gradient(100deg, var(--trench), #103A66 58%, var(--deep));
}

.page-about .about-band::before {
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(102deg, transparent 0 68px, rgba(23, 224, 200, .06) 68px 69px);
  pointer-events: none;
}

.page-about .about-band__inner {
  position: relative;
  display: flex;
  align-items: center;
  gap: 16px;
}

.page-about .about-band__mark {
  flex: none;
  width: 26px;
  height: 2px;
  border-radius: 2px;
  background: var(--jump);
}

.page-about .about-band__inner p {
  margin: 0;
  font-size: var(--fs-3);
  line-height: 1.6;
  font-weight: 600;
  color: var(--paper);
}

/* ---------- 图片 ---------- */

.page-about .about-fig {
  margin: 32px 0 0;
  border-radius: var(--r-m);
  overflow: hidden;
  border: 1px solid var(--about-hair);
  background: linear-gradient(140deg, var(--about-wash), var(--paper));
}

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

.page-about .about-fig figcaption {
  padding: 12px 18px;
  border-top: 1px solid var(--about-hair);
  font-size: var(--fs-1);
  line-height: 1.55;
  color: var(--about-soft);
}

/* ---------- 内容体系：四条线 ---------- */

.page-about .about-lines {
  margin: 36px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-line {
  display: grid;
  gap: 10px;
  padding: 26px 0;
  border-top: 1px solid var(--about-hair);
}

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

.page-about .about-line__head {
  display: flex;
  align-items: center;
  gap: 10px;
}

.page-about .about-line__bar {
  flex: none;
  width: 18px;
  height: 4px;
  border-radius: 3px;
  background: var(--c, var(--volt));
}

.page-about .about-line__title {
  margin: 0;
  font-size: var(--fs-4);
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--deep);
}

.page-about .about-line__body p {
  max-width: 720px;
  margin: 0 0 10px;
  font-size: var(--fs-2);
  line-height: 1.8;
  color: var(--about-body);
}

.page-about .about-line__who {
  font-size: var(--fs-1);
  color: var(--about-soft);
}

.page-about .about-line__who .link-more {
  color: var(--about-accent);
  margin-left: 4px;
}

/* ---------- 整理方式：步骤 ---------- */

.page-about .about-steps {
  margin: 34px 0 0;
  padding: 0;
  list-style: none;
  counter-reset: about-step;
}

.page-about .about-steps__item {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 14px;
  padding: 22px 0;
  border-top: 1px solid var(--about-hair);
}

.page-about .about-steps__item:last-child {
  border-bottom: 1px solid var(--about-hair);
}

.page-about .about-steps__num {
  font-family: var(--font-mono);
  font-size: var(--fs-2);
  font-weight: 600;
  letter-spacing: -.02em;
  color: var(--volt);
  padding-top: 3px;
}

.page-about .about-steps__title {
  margin: 0 0 8px;
  font-size: var(--fs-4);
  line-height: 1.42;
  font-weight: 800;
  color: var(--deep);
}

.page-about .about-steps__body p {
  max-width: 700px;
  margin: 0;
  font-size: var(--fs-2);
  line-height: 1.8;
  color: var(--about-body);
}

/* ---------- 团队 ---------- */

.page-about .about-team {
  margin: 34px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 28px;
}

.page-about .about-team__item {
  padding-top: 12px;
  border-top: 1px solid var(--about-hair);
}

.page-about .about-team__bar {
  display: block;
  width: var(--w, 50%);
  height: 5px;
  border-radius: 4px;
  background: linear-gradient(90deg, var(--volt), var(--surge));
  margin-bottom: 16px;
}

.page-about .about-team__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
}

.page-about .about-team__name {
  margin: 0;
  font-size: var(--fs-4);
  font-weight: 800;
  color: var(--deep);
}

.page-about .about-team__count {
  font-family: var(--font-mono);
  font-size: var(--fs-3);
  font-weight: 600;
  color: var(--jump);
  white-space: nowrap;
}

.page-about .about-team__item p {
  margin: 10px 0 0;
  font-size: var(--fs-2);
  line-height: 1.8;
  color: var(--about-body);
}

/* ---------- 发展历程：时间轴 ---------- */

.page-about .about-timeline {
  position: relative;
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 13px;
  top: 24px;
  bottom: 24px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--volt), var(--surge) 52%, var(--jump));
  opacity: .38;
}

.page-about .about-timeline__item {
  position: relative;
}

.page-about .about-stage {
  padding-left: 42px;
  border: 0;
}

.page-about .about-stage__summary {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 14px;
  padding: 16px 0;
  cursor: pointer;
  list-style: none;
  transition: color .2s ease;
}

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

.page-about .about-stage__summary::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 23px;
  width: 12px;
  height: 12px;
  box-sizing: border-box;
  border-radius: 50%;
  background: var(--paper);
  border: 2px solid var(--volt);
  transition: background .2s ease, border-color .2s ease, transform .2s ease;
}

.page-about .about-stage__summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--volt);
  transition: transform .2s ease, color .2s ease;
}

.page-about .about-stage[open] > .about-stage__summary::before {
  background: var(--jump);
  border-color: var(--jump);
  transform: scale(1.15);
}

.page-about .about-stage[open] > .about-stage__summary::after {
  transform: rotate(45deg);
  color: var(--jump);
}

.page-about .about-stage__summary:hover::after,
.page-about .about-stage__summary:focus-visible::after {
  color: var(--jump);
}

.page-about .about-stage__ver {
  font-family: var(--font-mono);
  font-size: var(--fs-2);
  font-weight: 600;
  letter-spacing: -.01em;
  color: var(--deep);
  background: var(--about-wash);
  border: 1px solid var(--about-hair);
  border-radius: var(--r-s);
  padding: 3px 8px;
}

.page-about .about-stage__name {
  font-size: var(--fs-4);
  font-weight: 800;
  color: var(--deep);
}

.page-about .about-stage__note {
  font-size: var(--fs-1);
  color: var(--about-soft);
}

.page-about .about-stage__body {
  padding: 0 0 20px;
}

.page-about .about-stage__body p {
  max-width: 700px;
  margin: 0;
  font-size: var(--fs-2);
  line-height: 1.8;
  color: var(--about-body);
}

/* ---------- 合作与认可 ---------- */

.page-about .about-panels {
  display: grid;
  gap: 20px;
  margin-top: 32px;
}

.page-about .about-panel {
  padding: 26px 24px;
  border: 1px solid var(--about-hair);
  border-radius: var(--r-m);
  background: var(--paper);
  box-shadow: 0 1px 0 rgba(6, 26, 51, .03), 0 12px 28px rgba(6, 26, 51, .05);
}

.page-about .about-panel--accent {
  background: linear-gradient(150deg, #ECF5FF, var(--paper) 68%);
  border-color: rgba(47, 123, 255, .26);
}

.page-about .about-panel__title {
  margin: 0 0 12px;
  font-size: var(--fs-4);
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--deep);
}

.page-about .about-panel p {
  margin: 0;
  font-size: var(--fs-2);
  line-height: 1.8;
  color: var(--about-body);
}

.page-about .about-awards {
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--about-hair);
}

.page-about .about-awards li {
  display: grid;
  grid-template-columns: 84px minmax(0, 1fr);
  gap: 16px;
  align-items: baseline;
  padding: 16px 0;
  border-bottom: 1px solid var(--about-hair);
}

.page-about .about-awards__year {
  font-family: var(--font-mono);
  font-size: var(--fs-2);
  font-weight: 600;
  color: var(--jump);
  white-space: nowrap;
}

.page-about .about-awards__text {
  font-size: var(--fs-2);
  line-height: 1.7;
  color: var(--about-body);
}

/* ---------- 去向 ---------- */

.page-about .about-next {
  margin: 0 0 80px;
  padding: 34px 0 0;
  border-top: 2px solid var(--deep);
}

.page-about .about-next__title {
  margin: 0 0 24px;
  font-size: clamp(21px, 3.2vw, 28px);
  font-weight: 900;
  letter-spacing: -.015em;
  color: var(--deep);
}

.page-about .about-next__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}

.page-about .about-next__list a {
  display: block;
  padding: 18px 20px;
  border: 1px solid var(--about-hair);
  border-radius: var(--r-m);
  background: var(--paper);
  text-decoration: none;
  transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease;
}

.page-about .about-next__list a:hover,
.page-about .about-next__list a:focus-visible {
  transform: translateY(-3px);
  border-color: rgba(255, 122, 41, .42);
  box-shadow: 0 14px 30px rgba(6, 26, 51, .10);
}

.page-about .about-next__label {
  display: block;
  font-size: var(--fs-4);
  font-weight: 800;
  color: var(--deep);
}

.page-about .about-next__desc {
  display: block;
  margin-top: 6px;
  font-size: var(--fs-2);
  line-height: 1.65;
  color: var(--about-soft);
}

/* ---------- 断点 ---------- */

@media (min-width: 640px) {
  .page-about .about-team {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 30px 32px;
  }

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

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

@media (min-width: 900px) {
  .page-about .about-hero {
    padding-top: 64px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.04fr) minmax(0, .96fr);
    gap: 56px;
    align-items: center;
  }

  .page-about .about-hero__stats {
    margin-top: 64px;
  }

  .page-about .about-hero__stats li {
    padding: 26px 24px 36px 0;
  }

  .page-about .about-body {
    padding-top: 92px;
  }

  .page-about .about-band {
    margin-bottom: 92px;
    padding: 32px 0;
  }

  .page-about .about-sec {
    margin-bottom: 100px;
  }

  .page-about .about-fig {
    margin-top: 40px;
  }

  .page-about .about-next {
    margin-bottom: 110px;
  }
}

@media (min-width: 1000px) {
  .page-about .about-body__grid {
    display: grid;
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: var(--about-col-gap);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 40px;
    margin-bottom: 0;
  }

  .page-about .about-rail__list {
    display: block;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-rail__list::before {
    content: "";
    display: block;
    position: absolute;
    left: 3px;
    top: 10px;
    bottom: 10px;
    width: 1px;
    background: linear-gradient(180deg, var(--volt), var(--surge) 55%, var(--jump));
    opacity: .35;
  }

  .page-about .about-rail__link {
    padding: 9px 0;
  }

  .page-about .about-rail__text {
    white-space: normal;
  }

  .page-about .about-line {
    grid-template-columns: 150px minmax(0, 1fr);
    gap: 28px;
    align-items: start;
    padding: 28px 0;
  }

  .page-about .about-line__head {
    padding-top: 3px;
  }

  .page-about .about-steps__item {
    grid-template-columns: 48px minmax(0, 1fr);
    gap: 20px;
    padding: 26px 0;
  }

  .page-about .about-team {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 26px;
  }
}

@media (min-width: 1200px) {
  .page-about .about-awards li {
    grid-template-columns: 110px minmax(0, 1fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-next__list a,
  .page-about .about-rail__tick,
  .page-about .about-stage__summary::after,
  .page-about .about-stage__summary::before {
    transition: none;
  }

  .page-about .about-next__list a:hover,
  .page-about .about-next__list a:focus-visible {
    transform: none;
  }
}
<<<END>>>

.page-about {
  --c: transparent;
  --w: 1rem;
}