.page-about {
  position: relative;
  padding-top: calc(var(--nav-h) + 12px);
  padding-bottom: 0;
  background:
    radial-gradient(760px 480px at 88% -6%, rgba(255, 46, 138, .22), transparent 64%),
    radial-gradient(680px 420px at 4% 3%, rgba(34, 230, 255, .14), transparent 68%),
    var(--ink-0);
  color: var(--paper);
}

.page-about::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 640px;
  pointer-events: none;
  background-image: linear-gradient(to right, rgba(255, 209, 230, .055) 1px, transparent 1px);
  background-size: clamp(80px, 12vw, 140px) 100%;
  -webkit-mask-image: linear-gradient(180deg, #000 0%, transparent 78%);
  mask-image: linear-gradient(180deg, #000 0%, transparent 78%);
}

.page-about :focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  box-shadow: 0 0 0 4px rgba(255, 200, 87, .26);
}

/* ---------- 基础壳 ---------- */
.page-about .about-shell {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: clamp(18px, 4vw, 36px);
  position: relative;
}

.page-about .about-section {
  padding-block: clamp(46px, 8vw, 88px);
  border-top: 1px solid rgba(255, 209, 230, .08);
}

.page-about .about-section__head {
  max-width: 54ch;
  margin-bottom: clamp(24px, 4vw, 40px);
}

.page-about .h2 {
  margin: 10px 0 0;
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: clamp(26px, 4.2vw, 44px);
  line-height: 1.14;
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-about .about-section__intro {
  margin: clamp(12px, 2vw, 18px) 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(255, 246, 251, .78);
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .14em;
  color: rgba(255, 209, 230, .62);
}

.page-about .breadcrumb a {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .2s ease, border-color .2s ease;
}

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

.page-about .breadcrumb__sep {
  opacity: .45;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-block: clamp(22px, 4.5vw, 52px) clamp(10px, 2vw, 20px);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(26px, 5vw, 54px);
  align-items: center;
}

.page-about .about-hero__title {
  margin: 16px 0 0;
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: clamp(38px, 9vw, 86px);
  line-height: .96;
  letter-spacing: -.025em;
  color: var(--paper);
  text-shadow: 0 0 44px rgba(255, 46, 138, .5), 0 0 14px rgba(34, 230, 255, .22);
}

.page-about .about-hero__lede {
  margin: clamp(16px, 2.4vw, 24px) 0 0;
  max-width: 48ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: rgba(255, 246, 251, .86);
}

.page-about .about-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-hero__facts li {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 7px 14px;
  border: 1px solid var(--line);
  background: rgba(27, 20, 48, .72);
  font-size: 12.5px;
  letter-spacing: .04em;
  color: rgba(255, 209, 230, .82);
}

.page-about .about-hero__num {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  color: var(--gold);
  letter-spacing: .04em;
}

.page-about .about-hero__media {
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line-magenta);
  background: var(--card);
  aspect-ratio: 16 / 10;
  transform: rotate(-.8deg);
  box-shadow: 0 44px 88px -54px rgba(255, 46, 138, .9);
}

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

/* ---------- 章节索引条 ---------- */
.page-about .about-index {
  position: sticky;
  top: calc(var(--nav-h) + 8px);
  z-index: 6;
  margin-block: clamp(26px, 5vw, 50px) 0;
}

.page-about .about-index__inner {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(11, 6, 20, .88);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-index__inner::-webkit-scrollbar {
  display: none;
}

.page-about .about-index__label {
  flex: 0 0 auto;
  padding-inline: 10px 8px;
  margin-right: 4px;
  border-right: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .22em;
  color: var(--gold);
}

.page-about .about-index__list {
  display: flex;
  flex: 0 0 auto;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-index__list a {
  display: block;
  padding: 8px 14px;
  border-radius: 999px;
  font-size: 13px;
  white-space: nowrap;
  text-decoration: none;
  color: rgba(255, 209, 230, .8);
  transition: background .2s ease, color .2s ease;
}

.page-about .about-index__list a:hover {
  color: var(--ink-0);
  background: linear-gradient(96deg, var(--magenta), var(--cyan));
}

/* ---------- 起点 ---------- */
.page-about .about-story {
  display: grid;
  gap: clamp(22px, 4vw, 36px);
}

.page-about .about-story__text p {
  margin: 0;
  max-width: 60ch;
  font-size: 15.5px;
  line-height: 1.9;
  color: rgba(255, 246, 251, .84);
}

.page-about .about-story__text p + p {
  margin-top: 1.05em;
}

.page-about .about-story__text p:first-child::first-letter {
  float: left;
  margin: .06em .18em 0 0;
  font-family: var(--font-mono);
  font-size: 3.1em;
  line-height: .84;
  font-weight: 700;
  color: var(--magenta);
}

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

.page-about .about-ask li {
  font-size: 13.5px;
  line-height: 1.78;
  color: rgba(255, 246, 251, .78);
}

.page-about .about-ask__k {
  display: block;
  margin-bottom: 3px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--cyan);
}

/* ---------- 三条服务主线 ---------- */
.page-about .about-lines {
  display: grid;
  gap: clamp(14px, 2vw, 20px);
}

.page-about .line-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: clamp(20px, 2.6vw, 30px);
  border: 1px solid var(--line);
  background: linear-gradient(158deg, rgba(75, 30, 140, .36), rgba(27, 20, 48, .92) 60%);
  transition: transform .28s ease, border-color .28s ease, box-shadow .28s ease;
}

.page-about .line-card::before {
  content: "";
  position: absolute;
  inset-inline: 0;
  top: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--magenta), var(--cyan));
  opacity: .5;
  transition: opacity .28s ease;
}

.page-about .line-card:hover,
.page-about .line-card:focus-within {
  transform: translateY(-4px);
  border-color: var(--line-cyan);
  box-shadow: 0 22px 44px -28px rgba(34, 230, 255, .7);
}

.page-about .line-card:hover::before,
.page-about .line-card:focus-within::before {
  opacity: 1;
}

.page-about .line-card__index {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .3em;
  color: var(--gold);
}

.page-about .line-card__title {
  margin: 0;
  font-size: clamp(17px, 2.2vw, 20px);
  font-weight: 800;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .line-card__body {
  margin: 0;
  flex: 1 1 auto;
  font-size: 14px;
  line-height: 1.85;
  color: rgba(255, 246, 251, .76);
}

.page-about .line-card__go {
  align-self: flex-start;
  margin-top: 4px;
  padding-bottom: 3px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .08em;
  text-decoration: none;
  color: rgba(255, 209, 230, .62);
  border-bottom: 1px solid transparent;
  transition: color .22s ease, border-color .22s ease;
}

.page-about .line-card__go:hover,
.page-about .line-card:focus-within .line-card__go {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

/* ---------- 日常运转 ---------- */
.page-about .about-engine {
  display: grid;
  gap: clamp(26px, 4vw, 44px);
}

.page-about .about-engine__main p {
  margin: 1em 0 0;
  max-width: 58ch;
  font-size: 15.5px;
  line-height: 1.88;
  color: rgba(255, 246, 251, .82);
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  border: 1px solid var(--line);
  background: var(--line);
}

.page-about .about-stat {
  display: grid;
  gap: 6px;
  padding: clamp(14px, 2.2vw, 20px);
  background: rgba(27, 20, 48, .94);
}

.page-about .about-stat__num {
  font-family: var(--font-mono);
  font-size: clamp(21px, 3vw, 29px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: .02em;
  color: var(--gold);
}

.page-about .about-stat__label {
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: .05em;
  color: rgba(255, 209, 230, .7);
}

/* ---------- 里程碑 ---------- */
.page-about .about-milestone__media {
  margin: 0 0 clamp(24px, 4vw, 40px);
  overflow: hidden;
  border: 1px solid var(--line);
  aspect-ratio: 16 / 9;
  background: var(--card);
}

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

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

.page-about .milestone::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--magenta), var(--violet) 60%, transparent);
}

.page-about .milestone__item {
  position: relative;
  padding-inline-start: 32px;
}

.page-about .milestone__item + .milestone__item {
  margin-top: 10px;
}

.page-about .milestone__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 16px;
  width: 11px;
  height: 11px;
  border: 1px solid var(--gold);
  background: var(--ink-0);
  transform: rotate(45deg);
}

.page-about .milestone__card summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 16px;
  padding: 12px 14px;
  border: 1px solid transparent;
  cursor: pointer;
  list-style: none;
  transition: border-color .22s ease, background .22s ease;
}

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

.page-about .milestone__card summary:hover {
  border-color: var(--line-cyan);
  background: rgba(34, 230, 255, .06);
}

.page-about .milestone__card[open] summary {
  border-color: var(--line-magenta);
  background: rgba(255, 46, 138, .07);
}

.page-about .milestone__year {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: .14em;
  color: var(--gold);
}

.page-about .milestone__title {
  font-size: 15.5px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .milestone__card p {
  margin: 4px 0 0;
  padding: 0 14px 14px;
  max-width: 62ch;
  font-size: 14px;
  line-height: 1.85;
  color: rgba(255, 246, 251, .76);
}

/* ---------- 团队与支持 ---------- */
.page-about .about-team {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
}

.page-about .about-team__copy p {
  margin: 1em 0 0;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.88;
  color: rgba(255, 246, 251, .82);
}

.page-about .about-contact {
  display: grid;
  gap: 10px;
  margin-top: clamp(20px, 3vw, 28px);
  padding: clamp(16px, 2.4vw, 22px);
  border: 1px solid var(--line);
  background: linear-gradient(142deg, rgba(75, 30, 140, .4), rgba(27, 20, 48, .94) 72%);
}

.page-about .about-contact__row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 12px;
}

.page-about .about-contact__k {
  flex: 0 0 auto;
  min-width: 62px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--gold);
}

.page-about .about-contact__v {
  font-size: 14px;
  line-height: 1.6;
  color: var(--paper);
  word-break: break-all;
}

.page-about .about-copy {
  flex: 0 0 auto;
  padding: 5px 12px;
  border: 1px solid var(--line-cyan);
  background: transparent;
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  cursor: pointer;
  transition: background .2s ease, color .2s ease, border-color .2s ease;
}

.page-about .about-copy:hover {
  background: var(--cyan);
  color: var(--ink-0);
}

.page-about .about-copy[data-copied] {
  border-color: var(--mint);
  color: var(--mint);
}

.page-about .about-team__media {
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line-cyan);
  aspect-ratio: 3 / 2;
  background: var(--card);
  box-shadow: 0 40px 80px -56px rgba(34, 230, 255, .95);
}

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

/* ---------- 收尾 ---------- */
.page-about .about-next {
  padding-block: 0 clamp(40px, 6vw, 76px);
}

.page-about .about-slant {
  height: clamp(42px, 7vw, 78px);
  border-top: 1px solid var(--line);
  background:
    linear-gradient(104deg, transparent 0 44%, rgba(255, 46, 138, .24) 44.2% 45.4%, transparent 45.6% 100%),
    linear-gradient(76deg, transparent 0 62%, rgba(34, 230, 255, .2) 62.2% 63%, transparent 63.2% 100%),
    radial-gradient(560px 170px at 30% 100%, rgba(75, 30, 140, .6), transparent 72%);
}

.page-about .about-next__inner {
  padding-block: clamp(30px, 5vw, 52px) 0;
}

.page-about .about-next__lede {
  margin: 12px 0 0;
  max-width: 46ch;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(255, 246, 251, .78);
}

.page-about .about-next__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 28px);
}

/* ---------- 断点 ---------- */
@media (min-width: 720px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 860px) {
  .page-about .about-lines {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: start;
  }

  .page-about .line-card:nth-child(2) {
    margin-block-start: -20px;
  }

  .page-about .line-card:nth-child(3) {
    margin-block-start: 16px;
  }
}

@media (min-width: 940px) {
  .page-about {
    padding-top: calc(var(--nav-h) + 34px);
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
  }

  .page-about .about-story {
    grid-template-columns: minmax(0, 7.4fr) minmax(0, 4fr);
    grid-template-areas:
      "head aside"
      "text aside";
    column-gap: clamp(34px, 5vw, 72px);
    align-items: start;
  }

  .page-about .about-story__head {
    grid-area: head;
    margin-bottom: clamp(16px, 2vw, 24px);
  }

  .page-about .about-story__text {
    grid-area: text;
  }

  .page-about .about-story__aside {
    grid-area: aside;
  }

  .page-about .about-engine {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4.4fr);
    column-gap: clamp(34px, 5vw, 76px);
    align-items: start;
  }

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

  .page-about .about-team {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    column-gap: clamp(34px, 5vw, 72px);
    align-items: start;
  }

  .page-about .milestone {
    padding-inline-start: 8px;
  }

  .page-about .milestone__item {
    padding-inline-start: 40px;
  }

  .page-about .milestone__card summary {
    padding: 14px 18px;
  }

  .page-about .milestone__card p {
    padding: 4px 18px 16px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .line-card,
  .page-about .line-card::before,
  .page-about .about-hero__media,
  .page-about .about-copy {
    transition: none;
  }

  .page-about .line-card:hover,
  .page-about .line-card:focus-within {
    transform: none;
  }

  .page-about .about-hero__media {
    transform: none;
  }
}
<<<END>>