.page-about {
  --about-rail: 84px;
  --about-tint: rgba(20, 26, 69, .55);
  display: block;
  position: relative;
}

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

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

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(22px, 4.6vw, 56px) 0 clamp(30px, 5vw, 68px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -12%;
  right: -18%;
  width: min(680px, 88vw);
  aspect-ratio: 1 / 1;
  background:
    radial-gradient(circle at 58% 42%, rgba(242, 196, 107, .17), transparent 62%),
    radial-gradient(circle at 30% 68%, rgba(79, 227, 208, .14), transparent 60%);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero .wrap {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(22px, 4vw, 40px);
}

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

.page-about .about-hero h1 {
  margin: 14px 0 0;
  font-size: clamp(30px, 6.4vw, 62px);
  line-height: 1.14;
  font-weight: 800;
  letter-spacing: -.012em;
}

.page-about .about-hero__lede {
  margin: 18px 0 0;
  max-width: 48ch;
  font-size: clamp(15px, 1.7vw, 18px);
  line-height: 1.82;
  color: var(--text);
}

.page-about .about-hero__stats {
  display: flex;
  flex-wrap: wrap;
  gap: 16px 32px;
  margin: 28px 0 0;
  padding: 20px 0 0;
  list-style: none;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 5px;
  min-width: 92px;
}

.page-about .about-stat__num {
  font-family: var(--f-mono);
  font-size: clamp(20px, 2.6vw, 28px);
  font-weight: 700;
  line-height: 1;
  color: var(--gold);
}

.page-about .about-stat__label {
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--muted);
}

/* ---------- 图片容器 ---------- */
.page-about .about-figure {
  margin: 0;
  overflow: hidden;
  background: var(--ink-800);
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, 0 100%);
  box-shadow: var(--shadow);
}

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

/* ---------- 章节骨架 ---------- */
.page-about .about-chapter {
  position: relative;
  padding: clamp(38px, 6.6vw, 92px) 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-chapter--tinted {
  background: linear-gradient(180deg, var(--about-tint), rgba(11, 16, 48, 0) 68%);
  clip-path: polygon(0 0, 100% 26px, 100% 100%, 0 100%);
}

.page-about .about-chapter__grid {
  display: grid;
  gap: 16px;
}

.page-about .about-chapter__rail {
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.page-about .about-chapter__no {
  font-family: var(--f-mono);
  font-size: clamp(19px, 2.4vw, 25px);
  font-weight: 700;
  line-height: 1;
  color: var(--gold);
}

.page-about .about-chapter__label {
  font-size: 11px;
  letter-spacing: .28em;
  color: var(--muted);
}

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

.page-about .about-head h2 {
  margin: 0;
  font-size: clamp(23px, 3.6vw, 38px);
  line-height: 1.22;
  font-weight: 800;
  letter-spacing: -.008em;
}

.page-about .about-head p {
  margin: 14px 0 0;
  max-width: 62ch;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.82;
}

/* ---------- 三条主线 ---------- */
.page-about .about-lines {
  display: grid;
  gap: 16px;
  margin: clamp(24px, 3.4vw, 38px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-line {
  position: relative;
  padding: 24px 22px 26px;
  background: linear-gradient(160deg, var(--ink-800), rgba(11, 16, 48, .92));
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, 0 100%);
  transition: background var(--t-mid) var(--ease), transform var(--t-mid) var(--ease);
}

.page-about .about-line::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 58%;
  height: 2px;
  background: linear-gradient(90deg, var(--gold), transparent);
}

.page-about .about-line__no {
  font-family: var(--f-mono);
  font-size: 13px;
  letter-spacing: .16em;
  color: var(--gold);
}

.page-about .about-line h3 {
  margin: 14px 0 0;
  font-size: 19px;
  font-weight: 700;
  line-height: 1.3;
}

.page-about .about-line p {
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.8;
}

.page-about .about-line__link {
  display: inline-block;
  margin-top: 16px;
  font-size: 14px;
  letter-spacing: .02em;
  color: var(--cyan);
}

.page-about .about-stepnote {
  margin: 24px 0 0;
  padding: 14px 18px;
  border-left: 2px solid var(--cyan);
  background: var(--cyan-wash);
  font-size: 14px;
  letter-spacing: .04em;
  color: var(--text);
}

.page-about .about-stepnote .mono {
  margin-right: 10px;
  color: var(--cyan);
  font-size: 12px;
  letter-spacing: .18em;
}

/* ---------- 发展历程 ---------- */
.page-about .about-stages {
  margin-top: clamp(24px, 3.4vw, 38px);
}

.page-about .about-stages .tabs__list {
  display: flex;
  flex-wrap: nowrap;
  gap: 10px;
  overflow-x: auto;
  padding: 4px 2px 12px;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-stages .tabs__btn {
  flex: 0 0 auto;
  scroll-snap-align: start;
  appearance: none;
  padding: 10px 16px;
  background: transparent;
  border: 1px solid var(--line);
  color: var(--muted);
  font: inherit;
  font-size: 13px;
  letter-spacing: .06em;
  white-space: nowrap;
  cursor: pointer;
  clip-path: polygon(9px 0, 100% 0, 100% calc(100% - 9px), calc(100% - 9px) 100%, 0 100%, 0 9px);
  transition: color var(--t-fast) var(--ease), background var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}

.page-about .about-stages .tabs__btn:hover,
.page-about .about-stages .tabs__btn:focus-visible {
  color: var(--gold-hi);
  border-color: var(--gold);
}

.page-about .about-stages .tabs__btn[aria-selected="true"] {
  background: var(--gold);
  border-color: var(--gold);
  color: var(--ink-900);
  font-weight: 700;
}

.page-about .about-stages__panel {
  margin-top: 14px;
  padding: 24px 22px 26px;
  background: rgba(20, 26, 69, .68);
  border-left: 2px solid var(--gold);
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, 0 100%);
}

.page-about .about-stages__meta {
  margin: 0;
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--cyan);
}

.page-about .about-stages__panel h3 {
  margin: 12px 0 0;
  font-size: clamp(18px, 2.2vw, 22px);
  font-weight: 700;
  line-height: 1.34;
}

.page-about .about-stages__panel p {
  margin: 12px 0 0;
  max-width: 60ch;
  color: var(--text);
  font-size: 15px;
  line-height: 1.82;
}

.page-about .about-stages__figure {
  margin-top: clamp(24px, 3.4vw, 40px);
}

/* ---------- 内容体系 ---------- */
.page-about .about-feeds {
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-feed {
  display: grid;
  gap: 8px;
  padding: 22px 0;
  border-top: 1px solid var(--line-soft);
}

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

.page-about .about-feed__tag {
  font-family: var(--f-mono);
  font-size: 13px;
  letter-spacing: .14em;
  color: var(--gold);
}

.page-about .about-feed__body {
  margin: 0;
  max-width: 66ch;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.84;
}

.page-about .about-feed__body a {
  margin-left: 6px;
  color: var(--cyan);
  white-space: nowrap;
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: clamp(22px, 3.4vw, 42px);
}

.page-about .about-roles {
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 18px;
}

.page-about .about-role {
  position: relative;
  padding-left: 20px;
  border-left: 2px solid var(--line);
}

.page-about .about-role::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 6px;
  width: 8px;
  height: 8px;
  background: var(--cyan);
  transform: rotate(45deg);
}

.page-about .about-role b {
  display: block;
  font-size: 16px;
  font-weight: 700;
  color: var(--text);
}

.page-about .about-role span {
  display: block;
  margin-top: 6px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 服务承诺 ---------- */
.page-about .about-promises {
  display: grid;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 34px);
}

.page-about .about-promises .fold {
  position: relative;
  background: linear-gradient(150deg, #18205a, rgba(11, 16, 48, .9));
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, 0 100%);
}

.page-about .about-promises .fold::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 72px;
  height: 2px;
  background: var(--cyan);
}

.page-about .about-promises .fold__btn {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  width: 100%;
  padding: 20px 22px;
  background: transparent;
  border: 0;
  color: var(--text);
  font: inherit;
  font-size: 16px;
  font-weight: 700;
  text-align: left;
  cursor: pointer;
  transition: color var(--t-fast) var(--ease);
}

.page-about .about-promises .fold__btn:hover,
.page-about .about-promises .fold__btn:focus-visible {
  color: var(--gold-hi);
}

.page-about .about-promises .fold__sign {
  position: relative;
  flex: 0 0 auto;
  width: 16px;
  height: 16px;
  margin-top: 3px;
}

.page-about .about-promises .fold__sign::before,
.page-about .about-promises .fold__sign::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 50%;
  height: 2px;
  background: var(--gold);
  transform: translateY(-50%);
  transition: transform var(--t-fast) var(--ease);
}

.page-about .about-promises .fold__sign::after {
  transform: translateY(-50%) rotate(90deg);
}

.page-about .about-promises .fold[data-open] .fold__sign::after {
  transform: translateY(-50%) rotate(0deg);
}

.page-about .about-promises .fold__panel {
  padding: 0 22px 22px 52px;
  font-size: 15px;
  line-height: 1.82;
  color: var(--muted);
}

/* ---------- 生态与伙伴 ---------- */
.page-about .about-partner {
  display: grid;
  gap: 18px;
  margin-top: clamp(22px, 3vw, 34px);
}

.page-about .about-partner__item {
  padding: 22px 20px;
  background: linear-gradient(200deg, rgba(79, 227, 208, .09), rgba(11, 16, 48, 0) 70%);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-partner__no {
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--magenta);
}

.page-about .about-partner__item h3 {
  margin: 12px 0 0;
  font-size: 18px;
  font-weight: 700;
}

.page-about .about-partner__item p {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 收尾 ---------- */
.page-about .about-close {
  padding: clamp(30px, 4.6vw, 68px) 0 clamp(44px, 7vw, 92px);
}

.page-about .about-close__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: clamp(24px, 3.4vw, 38px);
  background: linear-gradient(120deg, var(--gold-wash), var(--cyan-wash) 58%, rgba(11, 16, 48, 0));
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, var(--cut) 100%, 0 calc(100% - var(--cut)));
}

.page-about .about-close__text {
  margin: 0;
  max-width: 50ch;
  font-size: clamp(15px, 1.9vw, 18px);
  line-height: 1.72;
  color: var(--text);
}

.page-about .about-close__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 悬停微动效 ---------- */
@media (hover: hover) {
  .page-about .about-line:hover {
    background: linear-gradient(160deg, #1a2260, rgba(11, 16, 48, .94));
    transform: translateY(-4px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-line,
  .page-about .about-line:hover,
  .page-about .about-promises .fold__sign::before,
  .page-about .about-promises .fold__sign::after {
    transform: none;
    transition: none;
  }
}

/* ---------- 平板与桌面 ---------- */
@media (min-width: 700px) {
  .page-about .about-lines {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-feed {
    grid-template-columns: 150px minmax(0, 1fr);
    gap: 10px 28px;
    align-items: start;
  }

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

  .page-about .about-partner {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about {
    --about-rail: 92px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, .94fr);
    align-items: center;
    gap: clamp(32px, 4.6vw, 62px);
  }

  .page-about .about-chapter__grid {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(20px, 3vw, 46px);
  }

  .page-about .about-chapter__rail {
    flex-direction: column;
    align-items: center;
    gap: 16px;
    position: sticky;
    top: 104px;
    align-self: start;
  }

  .page-about .about-chapter__label {
    writing-mode: vertical-rl;
    text-orientation: mixed;
    letter-spacing: .34em;
    padding-left: .34em;
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 1fr) minmax(0, .84fr);
    align-items: start;
  }

  .page-about .about-line:nth-child(2) {
    transform: translateY(18px);
  }

  .page-about .about-feed {
    grid-template-columns: 190px minmax(0, 1fr);
  }
}

@media (min-width: 900px) and (hover: hover) {
  .page-about .about-line:nth-child(2):hover {
    transform: translateY(14px);
  }
}

@media (min-width: 1120px) {
  .page-about .about-head p {
    font-size: 16px;
  }
}
<<<END>>>