.page-about {
  --about-gap: clamp(28px, 5vw, 64px);
  --about-num-color: var(--cyan);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: clamp(20px, 4vw, 44px) 0 clamp(40px, 7vw, 88px);
  position: relative;
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: auto -20% -40% 30%;
  height: 380px;
  background: radial-gradient(closest-side, rgba(177, 75, 255, 0.22), transparent 72%);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(24px, 4vw, 48px);
}

.page-about .about-hero__title {
  margin: 12px 0 0;
  font-family: var(--sans);
  font-weight: 800;
  font-size: clamp(38px, 8.4vw, 84px);
  line-height: 0.98;
  letter-spacing: -0.03em;
  color: var(--white);
}

.page-about .about-hero__side .lede {
  margin: 0 0 28px;
  max-width: 34em;
}

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

.page-about .about-stats__item {
  background: var(--ink);
  padding: 18px 16px 16px 0;
  display: grid;
  gap: 6px;
  align-content: start;
}

.page-about .about-stats__item:nth-child(even) {
  padding-left: 16px;
}

.page-about .about-stats__num {
  font-size: clamp(26px, 4.6vw, 40px);
  line-height: 1;
  color: var(--about-num-color);
  letter-spacing: -0.02em;
}

.page-about .about-stats__label {
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 通用章节头 ---------- */
.page-about .about-head {
  max-width: 46em;
  margin-bottom: clamp(24px, 4vw, 44px);
}

.page-about .about-head__title {
  margin: 10px 0 0;
  font-family: var(--sans);
  font-weight: 800;
  font-size: clamp(28px, 5.4vw, 52px);
  line-height: 1.06;
  letter-spacing: -0.025em;
  color: var(--white);
}

.page-about .about-head__text {
  margin: 18px 0 0;
  max-width: 36em;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.75;
}

/* ---------- 双栏长卷骨架 ---------- */
.page-about .about-block {
  display: grid;
  gap: clamp(20px, 3.5vw, 40px);
}

.page-about .about-block__body {
  display: grid;
  gap: 18px;
  align-content: start;
}

.page-about .prose--about {
  max-width: 36em;
  margin: 0;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.8;
}

/* ---------- 版本演进 ---------- */
.page-about .about-evo__fig {
  margin: 0 0 clamp(28px, 4vw, 52px);
}

.page-about .about-evo__fig .media__cap {
  color: var(--muted);
}

.page-about .tl {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
  display: grid;
  gap: 26px;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, rgba(53, 240, 224, 0.55), rgba(53, 240, 224, 0.08));
}

.page-about .tl__item {
  position: relative;
  padding-left: 34px;
  outline: none;
}

.page-about .tl__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--cyan);
  box-shadow: 0 0 0 4px rgba(53, 240, 224, 0.1), 0 0 16px rgba(53, 240, 224, 0.5);
  transition: box-shadow 240ms var(--ease), background 240ms var(--ease);
}

.page-about .tl__item:hover::before,
.page-about .tl__item:focus-within::before,
.page-about .tl__item:focus::before {
  background: var(--cyan);
  box-shadow: 0 0 0 6px rgba(53, 240, 224, 0.16), 0 0 24px rgba(53, 240, 224, 0.7);
}

.page-about .tl__v {
  display: inline-block;
  font-size: 22px;
  line-height: 1;
  color: var(--cyan);
  letter-spacing: -0.02em;
}

.page-about .tl__name {
  margin: 8px 0 6px;
  font-size: 19px;
  font-weight: 700;
  color: var(--white);
  letter-spacing: -0.01em;
}

.page-about .tl__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
  max-width: 26em;
}

.page-about .tl__more {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
  display: grid;
  gap: 6px;
  font-size: 13px;
  line-height: 1.65;
  color: rgba(154, 166, 204, 0.86);
}

.page-about .tl__more li {
  position: relative;
  padding-left: 14px;
}

.page-about .tl__more li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 6px;
  height: 1px;
  background: var(--orange);
}

/* ---------- 内容主张 ---------- */
.page-about .about-quote {
  margin: 0;
  padding: 4px 0 4px 20px;
  border-left: 3px solid var(--orange);
}

.page-about .about-quote p {
  margin: 0;
  font-size: clamp(20px, 3.4vw, 30px);
  line-height: 1.42;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--white);
  max-width: 22em;
}

.page-about .about-pills {
  list-style: none;
  margin: 4px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

/* ---------- 团队 ---------- */
.page-about .about-crew__head {
  display: grid;
  gap: 20px;
  align-content: start;
}

.page-about .about-crew__fig {
  margin: 0;
  max-width: 340px;
}

.page-about .crew-seg {
  display: grid;
  gap: 18px;
}

.page-about .crew-panel {
  padding-top: 4px;
}

.page-about .crew-panel__title {
  margin: 0 0 10px;
  font-size: 18px;
  font-weight: 700;
  color: var(--cyan);
  letter-spacing: -0.01em;
}

.page-about .crew-panel p {
  margin: 0 0 12px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
  max-width: 34em;
}

.page-about .crew-panel__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-about .crew-panel__list li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(242, 245, 255, 0.82);
}

.page-about .crew-panel__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.68em;
  width: 8px;
  height: 8px;
  border-radius: 2px;
  background: rgba(53, 240, 224, 0.55);
}

/* ---------- 核对流程 ---------- */
.page-about .about-flow__fig {
  margin: 0 0 clamp(28px, 4vw, 48px);
}

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

.page-about .flow__step {
  position: relative;
  padding: 0 0 30px 58px;
}

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

.page-about .flow__step::before {
  content: "";
  position: absolute;
  left: 18px;
  top: 42px;
  bottom: 4px;
  border-left: 2px dashed rgba(53, 240, 224, 0.32);
}

.page-about .flow__step:last-child::before {
  display: none;
}

.page-about .flow__num {
  position: absolute;
  left: 0;
  top: 0;
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  border: 1px solid var(--line-strong);
  background: var(--ink-2);
  color: var(--cyan);
  font-size: 13px;
}

.page-about .flow__title {
  margin: 6px 0 8px;
  font-size: 19px;
  font-weight: 700;
  color: var(--white);
  letter-spacing: -0.01em;
}

.page-about .flow__text {
  margin: 0 0 10px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
  max-width: 34em;
}

.page-about .flow__time {
  display: inline-block;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--pulse);
  padding: 4px 10px;
  border-radius: 999px;
  background: rgba(255, 228, 92, 0.1);
  border: 1px solid rgba(255, 228, 92, 0.3);
}

/* ---------- 合作生态 ---------- */
.page-about .eco-list {
  list-style: none;
  margin: 6px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .eco-list__item {
  background: var(--ink-2);
  padding: 16px 14px;
  display: grid;
  gap: 6px;
}

.page-about .eco-list__key {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--cyan);
}

.page-about .eco-list__val {
  font-size: 14px;
  line-height: 1.72;
  color: var(--muted);
}

.page-about .mile {
  list-style: none;
  margin: clamp(32px, 5vw, 56px) 0 0;
  padding: 0;
  display: grid;
  gap: 22px;
}

.page-about .mile__item {
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 14px;
  align-items: start;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--line);
}

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

.page-about .mile__k {
  font-size: 15px;
  color: var(--orange);
  padding-top: 3px;
}

.page-about .mile__title {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 700;
  color: var(--white);
  letter-spacing: -0.01em;
}

.page-about .mile__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
  max-width: 40em;
}

/* ---------- 收束 ---------- */
.page-about .about-next {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

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

.page-about .about-next__link {
  display: grid;
  grid-template-columns: 38px 1fr auto;
  grid-template-areas:
    "k t arrow"
    "k d arrow";
  align-items: center;
  gap: 4px 12px;
  padding: 18px 4px;
  text-decoration: none;
  color: var(--white);
  transition: background 240ms var(--ease), padding-left 240ms var(--ease);
}

.page-about .about-next__k {
  grid-area: k;
  font-size: 13px;
  color: var(--muted);
}

.page-about .about-next__t {
  grid-area: t;
  font-size: clamp(18px, 3vw, 24px);
  font-weight: 700;
  letter-spacing: -0.015em;
}

.page-about .about-next__d {
  grid-area: d;
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .about-next__arrow {
  grid-area: arrow;
  font-size: 20px;
  color: var(--cyan);
  transition: transform 240ms var(--ease);
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  background: rgba(53, 240, 224, 0.06);
}

.page-about .about-next__link:hover .about-next__t,
.page-about .about-next__link:focus-visible .about-next__t {
  color: var(--cyan);
}

.page-about .about-next__link:hover .about-next__arrow,
.page-about .about-next__link:focus-visible .about-next__arrow {
  transform: translateX(6px);
}

.page-about .about-tail {
  margin: clamp(24px, 4vw, 40px) 0 0;
  max-width: 36em;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

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

  .page-about .about-stats__item:nth-child(n) {
    padding-left: 18px;
    padding-right: 12px;
  }

  .page-about .about-stats__item:first-child {
    padding-left: 0;
  }

  .page-about .about-next__link {
    grid-template-columns: 56px minmax(0, 18em) 1fr auto;
    grid-template-areas: "k t d arrow";
    gap: 20px;
    padding: 22px 8px;
  }

  .page-about .about-next__k {
    font-size: 14px;
  }
}

@media (min-width: 780px) {
  .page-about .tl {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0;
  }

  .page-about .tl::before {
    left: 0;
    right: 0;
    top: 12px;
    bottom: auto;
    width: auto;
    height: 1px;
    background: linear-gradient(90deg, rgba(53, 240, 224, 0.6), rgba(53, 240, 224, 0.1));
  }

  .page-about .tl__item {
    padding: 36px 24px 0 0;
  }

  .page-about .tl__item::before {
    top: 6px;
  }

  .page-about .flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0 40px;
  }

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

  .page-about .flow__step {
    padding-left: 56px;
    padding-bottom: 34px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: end;
  }

  .page-about .about-hero__side {
    padding-bottom: 8px;
  }

  .page-about .about-block {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: var(--about-gap);
    align-items: start;
  }

  .page-about .about-crew__fig {
    max-width: none;
  }

  .page-about .about-head__title {
    font-size: clamp(34px, 4.2vw, 52px);
  }
}

@media (hover: hover) and (min-width: 780px) {
  .page-about .tl__more {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    margin-top: 0;
    transition: max-height 300ms var(--ease), opacity 240ms var(--ease), margin-top 240ms var(--ease);
  }

  .page-about .tl__item:hover .tl__more,
  .page-about .tl__item:focus .tl__more,
  .page-about .tl__item:focus-within .tl__more {
    max-height: 200px;
    opacity: 1;
    margin-top: 12px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl__more {
    transition: none;
  }

  .page-about .about-next__link,
  .page-about .about-next__arrow,
  .page-about .tl__item::before {
    transition: none;
  }
}
<<<END>>>