.page-about {
  --about-hair: rgba(183, 198, 221, .16);
  --about-hair-strong: rgba(183, 198, 221, .32);
  --about-ink-soft: #2C4067;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: clamp(24px, 5vw, 52px) 0 clamp(42px, 7vw, 86px);
  background:
    radial-gradient(120% 92% at 84% -6%, rgba(27, 58, 122, .78), transparent 62%),
    radial-gradient(88% 78% at 4% 104%, rgba(95, 216, 245, .13), transparent 62%),
    var(--blue-900);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -12%;
  right: -8%;
  width: min(560px, 64vw);
  height: 124%;
  background: linear-gradient(148deg, rgba(75, 255, 158, .18), rgba(255, 122, 41, .15) 54%, transparent 76%);
  clip-path: polygon(30% 0, 100% 0, 100% 100%, 0 100%);
  z-index: -1;
  animation: about-drift 18s ease-in-out infinite alternate;
}

@keyframes about-drift {
  from { transform: translate3d(0, -14px, 0); }
  to { transform: translate3d(0, 16px, 0); }
}

.page-about .about-hero__inner {
  display: grid;
  gap: clamp(26px, 5vw, 52px);
  align-items: center;
}

.page-about .about-hero__copy > .crumbs {
  margin-bottom: 18px;
}

.page-about .about-hero .eyebrow {
  margin: 0 0 12px;
  color: var(--cyan-400);
  letter-spacing: .3em;
}

.page-about .about-hero .h-display {
  margin: 0 0 18px;
  color: var(--silver-100);
}

.page-about .about-hero .lede {
  margin: 0;
  max-width: 48ch;
  color: var(--silver-300);
}

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

.page-about .about-hero__media {
  margin: 0;
}

.page-about .about-hero__media .media__frame {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line-strong);
  background: linear-gradient(160deg, var(--blue-500), var(--blue-900));
  box-shadow: var(--shadow);
  clip-path: polygon(0 0, 100% 0, 100% 100%, 0 93%);
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(.9) contrast(1.05);
}

.page-about .about-hero__media .media__cap {
  color: var(--silver-500);
}

.page-about .about-hero__annotation {
  display: none;
}

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, .98fr);
  }
}

@media (min-width: 1160px) {
  .page-about .about-hero__annotation {
    display: block;
    position: absolute;
    right: 18px;
    top: 50%;
    margin: 0;
    transform: translateY(-50%) rotate(90deg);
    font-size: 11px;
    letter-spacing: .34em;
    color: var(--silver-500);
    white-space: nowrap;
  }
}

/* ---------- 主体骨架 ---------- */
.page-about .about-body {
  display: grid;
  gap: 30px;
  padding: clamp(36px, 6vw, 74px) 0 clamp(64px, 9vw, 110px);
}

.page-about .about-toc {
  border-left: 2px solid var(--about-hair);
  padding-left: 16px;
}

.page-about .about-toc .toc__title {
  color: var(--silver-500);
  font-size: 11px;
  letter-spacing: .3em;
  margin: 0 0 12px;
}

.page-about .about-toc .toc__list {
  display: grid;
  gap: 4px;
}

.page-about .about-toc .toc__link {
  display: block;
  padding: 6px 8px;
  border-left: 2px solid transparent;
  margin-left: -18px;
  font-size: 14px;
  color: var(--silver-300);
  text-decoration: none;
  transition: color .2s ease, border-color .2s ease, background .2s ease;
}

.page-about .about-toc .toc__link:hover,
.page-about .about-toc .toc__link:focus-visible {
  color: var(--silver-100);
  border-left-color: var(--about-hair-strong);
}

.page-about .about-toc .toc__link.is-active,
.page-about .about-toc .toc__link[aria-current="true"] {
  color: var(--green-400);
  border-left-color: var(--green-400);
  background: rgba(75, 255, 158, .06);
}

.page-about .about-content > .section + .section {
  margin-top: clamp(46px, 7vw, 88px);
}

.page-about .section__head {
  margin-bottom: clamp(16px, 3vw, 26px);
}

.page-about .h-section .sec-num {
  display: inline-block;
  margin-right: 10px;
  font-family: var(--font-mono);
  color: var(--green-400);
  font-size: .72em;
  letter-spacing: .04em;
}

.page-about .about-intro {
  max-width: 62ch;
  margin: 0 0 26px;
  color: var(--silver-300);
}

@media (min-width: 980px) {
  .page-about .about-body {
    grid-template-columns: 208px minmax(0, 1fr);
    gap: clamp(30px, 4.4vw, 68px);
    align-items: start;
  }

  .page-about .about-toc {
    position: sticky;
    top: 118px;
  }
}

/* ---------- 01 三条主线 ---------- */
.page-about .about-lines {
  display: grid;
  gap: 16px;
}

.page-about .about-lines__card {
  padding: clamp(20px, 3vw, 30px);
}

.page-about .about-lines__card .eyebrow {
  margin: 0 0 8px;
  color: var(--cyan-400);
  letter-spacing: .24em;
}

.page-about .about-lines__card h3 {
  margin: 0 0 10px;
  font-size: clamp(19px, 2.2vw, 22px);
  color: var(--silver-100);
}

.page-about .about-lines__card p {
  margin: 0 0 14px;
  color: var(--silver-300);
}

.page-about .about-lines__card--wide {
  background-image: linear-gradient(140deg, rgba(75, 255, 158, .10), rgba(27, 58, 122, .32) 58%, transparent);
}

.page-about .about-lines__card--ice {
  background: var(--ice-white);
  border-color: rgba(255, 255, 255, .6);
}

.page-about .about-lines__card--ice .eyebrow {
  color: var(--blue-500);
}

.page-about .about-lines__card--ice h3 {
  color: var(--blue-900);
}

.page-about .about-lines__card--ice p {
  color: var(--about-ink-soft);
}

.page-about .about-lines__list {
  display: grid;
  gap: 7px;
  margin: 0 0 16px;
  padding: 0;
  list-style: none;
}

.page-about .about-lines__list li {
  position: relative;
  padding-left: 17px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--silver-300);
}

.page-about .about-lines__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .62em;
  width: 7px;
  height: 7px;
  border-radius: 1px;
  background: var(--cyan-400);
}

.page-about .about-lines__link {
  display: inline-block;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--green-400);
  text-decoration: none;
  border-bottom: 1px solid rgba(75, 255, 158, .38);
  padding-bottom: 2px;
}

.page-about .about-lines__link:hover,
.page-about .about-lines__link:focus-visible {
  color: var(--ice-white);
  border-bottom-color: var(--ice-white);
}

.page-about .about-lines__card--ice .about-lines__link {
  color: var(--orange-500);
  border-bottom-color: rgba(255, 122, 41, .45);
}

.page-about .about-lines__card--ice .about-lines__link:hover,
.page-about .about-lines__card--ice .about-lines__link:focus-visible {
  color: var(--blue-900);
  border-bottom-color: var(--blue-900);
}

@media (min-width: 860px) {
  .page-about .about-lines {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .about-lines__card--wide {
    grid-column: 1 / -1;
  }
}

/* ---------- 02 发展历程 ---------- */
.page-about .about-history__figure {
  margin: 0 0 clamp(24px, 4vw, 40px);
}

.page-about .about-history__figure .media__frame {
  overflow: hidden;
  border: 1px solid var(--about-hair);
  background: linear-gradient(120deg, var(--blue-700), var(--blue-900));
}

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

.page-about .about-history__figure .media__cap {
  color: var(--silver-500);
}

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

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan-400), rgba(95, 216, 245, .05));
}

.page-about .about-timeline__item {
  position: relative;
  padding-bottom: clamp(20px, 3vw, 30px);
  outline: none;
}

.page-about .about-timeline__dot {
  position: absolute;
  left: -30px;
  top: 5px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--blue-900);
  border: 2px solid var(--cyan-400);
  box-shadow: 0 0 0 5px rgba(95, 216, 245, .10);
  transition: border-color .25s ease, box-shadow .25s ease;
}

.page-about .about-timeline__item:hover .about-timeline__dot,
.page-about .about-timeline__item:focus-within .about-timeline__dot {
  border-color: var(--green-400);
  box-shadow: 0 0 0 7px rgba(75, 255, 158, .16);
}

.page-about .about-timeline__year {
  margin: 0 0 4px;
  font-size: 19px;
  letter-spacing: .06em;
  color: var(--green-400);
}

.page-about .about-timeline__title {
  margin: 0 0 6px;
  font-size: 18px;
  color: var(--silver-100);
}

.page-about .about-timeline__text {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--silver-300);
}

.page-about .about-timeline__more {
  margin: 10px 0 0;
  padding-left: 12px;
  border-left: 2px solid var(--green-400);
  font-size: 14px;
  line-height: 1.75;
  color: var(--silver-500);
}

@media (min-width: 901px) {
  .page-about .about-timeline__more {
    max-height: 0;
    margin-top: 0;
    padding-top: 0;
    padding-bottom: 0;
    opacity: 0;
    overflow: hidden;
    transition: max-height .4s ease, opacity .3s ease, margin-top .3s ease, padding .3s ease;
  }

  .page-about .about-timeline__item:hover .about-timeline__more,
  .page-about .about-timeline__item:focus-within .about-timeline__more {
    max-height: 10rem;
    margin-top: 10px;
    padding-top: 5px;
    padding-bottom: 5px;
    opacity: 1;
  }
}

/* ---------- 03 团队与产能 ---------- */
.page-about .about-team__strip {
  margin-bottom: clamp(24px, 4vw, 38px);
}

.page-about .about-team__grid {
  display: grid;
  gap: 20px;
}

.page-about .about-team__text p {
  margin: 0 0 14px;
  color: var(--silver-300);
}

.page-about .about-team__card {
  padding: clamp(20px, 3vw, 28px);
  background-image: linear-gradient(160deg, rgba(27, 58, 122, .5), rgba(8, 18, 43, .2));
}

.page-about .about-team__card .eyebrow {
  margin: 0 0 12px;
  color: var(--orange-500);
  letter-spacing: .24em;
}

.page-about .about-team__roles {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-team__roles li {
  padding-left: 40px;
  position: relative;
  font-size: 15px;
  line-height: 1.8;
  color: var(--silver-300);
}

.page-about .about-team__roles li .mono {
  position: absolute;
  left: 0;
  top: 2px;
  width: 26px;
  height: 26px;
  display: grid;
  place-items: center;
  font-size: 12px;
  border: 1px solid var(--about-hair-strong);
  border-radius: var(--radius);
  color: var(--cyan-400);
}

.page-about .about-team__roles li strong {
  display: block;
  color: var(--silver-100);
  font-size: 15.5px;
  margin-bottom: 2px;
}

@media (min-width: 900px) {
  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    gap: clamp(24px, 4vw, 44px);
    align-items: start;
  }
}

/* ---------- 04 服务地区 ---------- */
.page-about .about-region__grid {
  display: grid;
  gap: 22px;
}

.page-about .about-region__text p {
  margin: 0 0 14px;
  color: var(--silver-300);
}

.page-about .about-region__card {
  padding: clamp(20px, 3vw, 28px);
  background: var(--ice-white);
  border-color: rgba(255, 255, 255, .6);
}

.page-about .about-region__card .eyebrow {
  margin: 0 0 12px;
  color: var(--blue-500);
  letter-spacing: .24em;
}

.page-about .about-region__rhythm {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-region__rhythm li {
  display: grid;
  grid-template-columns: 62px minmax(0, 1fr);
  align-items: baseline;
  gap: 10px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--about-ink-soft);
  padding-bottom: 10px;
  border-bottom: 1px dashed rgba(27, 58, 122, .18);
}

.page-about .about-region__rhythm li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .about-region__rhythm .mono {
  color: var(--blue-500);
  font-size: 13px;
  letter-spacing: .04em;
}

@media (min-width: 900px) {
  .page-about .about-region__grid {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, .8fr);
    gap: clamp(24px, 4vw, 46px);
    align-items: start;
  }
}

/* ---------- 05 内容来源 ---------- */
.page-about .about-source__figure {
  margin: 0 0 clamp(22px, 4vw, 36px);
}

.page-about .about-source__figure .media__frame {
  overflow: hidden;
  border: 1px solid var(--about-hair);
  background: linear-gradient(120deg, var(--blue-700), var(--blue-900));
}

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

.page-about .about-source__figure .media__cap {
  color: var(--silver-500);
}

.page-about .about-flow {
  display: grid;
  gap: 18px;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: about-flow;
}

.page-about .about-flow__item {
  position: relative;
  padding: clamp(18px, 2.6vw, 24px);
  border: 1px solid var(--about-hair);
  border-top: 3px solid var(--cyan-400);
  background: rgba(16, 34, 76, .42);
  backdrop-filter: blur(6px);
}

.page-about .about-flow__item:nth-child(2) {
  border-top-color: var(--green-400);
}

.page-about .about-flow__item:nth-child(3) {
  border-top-color: var(--orange-500);
}

.page-about .about-flow__idx {
  display: block;
  margin-bottom: 8px;
  font-size: 12px;
  letter-spacing: .28em;
  color: var(--silver-500);
}

.page-about .about-flow__title {
  margin: 0 0 8px;
  font-size: 18px;
  color: var(--silver-100);
}

.page-about .about-flow__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--silver-300);
}

.page-about .about-source__note {
  margin: 22px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--green-400);
  font-size: 15px;
  line-height: 1.8;
  color: var(--silver-100);
}

@media (min-width: 820px) {
  .page-about .about-flow {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }
}

/* ---------- 06 三件事 ---------- */
.page-about .about-claims {
  display: grid;
  gap: 16px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-claims__item {
  padding: clamp(18px, 2.6vw, 26px);
  border-left: 3px solid var(--blue-500);
  background: linear-gradient(120deg, rgba(27, 58, 122, .34), rgba(8, 18, 43, .12));
}

.page-about .about-claims__num {
  display: block;
  margin-bottom: 10px;
  font-size: 26px;
  line-height: 1;
  color: var(--green-400);
}

.page-about .about-claims__item h3 {
  margin: 0 0 8px;
  font-size: 19px;
  color: var(--silver-100);
}

.page-about .about-claims__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--silver-300);
}

@media (min-width: 820px) {
  .page-about .about-claims {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
    align-items: start;
  }

  .page-about .about-claims__item:nth-child(2) {
    margin-top: 26px;
    border-left-color: var(--cyan-400);
  }

  .page-about .about-claims__item:nth-child(3) {
    margin-top: 52px;
    border-left-color: var(--orange-500);
  }
}

/* ---------- 通用收尾 ---------- */
.page-about .media figcaption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.7;
}

.page-about img {
  max-width: 100%;
  height: auto;
}

@media (max-width: 620px) {
  .page-about .about-lines__card,
  .page-about .about-flow__item,
  .page-about .about-claims__item {
    padding: 18px 16px;
  }

  .page-about .about-region__rhythm li {
    grid-template-columns: 54px minmax(0, 1fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-hero::before {
    animation: none;
  }

  .page-about .about-timeline__more,
  .page-about .about-timeline__dot,
  .page-about .about-toc .toc__link {
    transition: none;
  }
}
<<<END>>>