.page-about {
  --about-pad-y: clamp(56px, 8vw, 104px);
  --about-cut: 18px;
  background: var(--ink-deep);
  color: var(--text);
  overflow-x: clip;
}

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

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: calc(var(--header-h) + clamp(26px, 5vw, 54px));
  padding-bottom: clamp(44px, 7vw, 86px);
  border-bottom: 1px solid var(--line-soft);
  background:
    radial-gradient(900px 480px at 82% -10%, rgba(47, 216, 216, 0.12), transparent 68%),
    radial-gradient(560px 360px at 4% 12%, rgba(242, 167, 59, 0.08), transparent 70%);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(30px, 4.5vw, 58px);
  margin-top: clamp(26px, 4vw, 48px);
}

.page-about .about-hero__lead h1 {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(33px, 6vw, 62px);
  line-height: 1.06;
  letter-spacing: -0.03em;
  color: var(--cream);
  margin: 14px 0 0;
}

.page-about .about-hero__lede {
  margin: 22px 0 0;
  max-width: 58ch;
  font-size: clamp(16px, 1.5vw, 18px);
  line-height: 1.82;
  color: var(--text-dim);
}

.page-about .about-hero__lede--dim {
  margin-top: 14px;
  font-size: 15px;
  color: var(--stone);
}

.page-about .about-hero__aside {
  position: relative;
  padding: 22px 22px 22px 24px;
  background: linear-gradient(160deg, rgba(16, 38, 63, 0.92), rgba(10, 26, 47, 0.6));
  border: 1px solid var(--line-soft);
  border-left: 3px solid var(--cyan);
  clip-path: polygon(0 0, calc(100% - var(--about-cut)) 0, 100% var(--about-cut), 100% 100%, var(--about-cut) 100%, 0 calc(100% - var(--about-cut)));
}

.page-about .about-hero__aside-title {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 14px;
  letter-spacing: 0.16em;
  color: var(--cyan);
  margin: 0 0 16px;
}

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

.page-about .about-milestones li {
  display: grid;
  grid-template-columns: 62px minmax(0, 1fr);
  gap: 12px;
  align-items: baseline;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line-soft);
}

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

.page-about .about-milestones__year {
  font-family: var(--font-mono);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--amber);
}

.page-about .about-milestones__text {
  font-size: 14px;
  line-height: 1.6;
  color: var(--text-dim);
}

.page-about .about-hero__aside-note {
  margin: 18px 0 0;
  padding-top: 14px;
  border-top: 1px dashed var(--line-soft);
  font-size: 12px;
  line-height: 1.7;
  color: var(--stone);
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
    align-items: end;
  }
}

/* ---------- 通用章节头 ---------- */
.page-about .about-head h2 {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(26px, 3.7vw, 42px);
  line-height: 1.14;
  letter-spacing: -0.025em;
  color: var(--cream);
  margin: 12px 0 0;
  max-width: 24ch;
}

.page-about .about-head p {
  margin: 16px 0 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--text-dim);
}

/* ---------- 沿革 ---------- */
.page-about .about-track {
  padding: var(--about-pad-y) 0;
  background: linear-gradient(180deg, rgba(16, 38, 63, 0.32), transparent 40%);
}

.page-about .about-timeline {
  list-style: none;
  margin: clamp(32px, 5vw, 56px) 0 0;
  padding: 0;
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 clamp(28px, 4vw, 46px) 26px;
  border-left: 1px solid var(--line);
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 8px;
  width: 9px;
  height: 9px;
  background: var(--cyan);
  transform: rotate(45deg);
  box-shadow: 0 0 0 4px var(--cyan-soft);
}

.page-about .about-timeline__stamp {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 10px;
}

.page-about .about-timeline__year {
  font-family: var(--font-mono);
  font-size: clamp(22px, 3.2vw, 30px);
  font-weight: 700;
  letter-spacing: 0.03em;
  color: var(--amber);
  line-height: 1;
}

.page-about .about-timeline__body h3 {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(19px, 2.1vw, 25px);
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--cream);
  margin: 0 0 10px;
}

.page-about .about-timeline__body p {
  margin: 0;
  max-width: 64ch;
  font-size: 15.5px;
  line-height: 1.82;
  color: var(--text-dim);
}

.page-about .about-track__figure {
  margin-top: clamp(34px, 5vw, 60px);
}

@media (min-width: 860px) {
  .page-about .about-timeline__item {
    display: grid;
    grid-template-columns: 132px minmax(0, 1fr);
    gap: clamp(20px, 4vw, 52px);
    padding-left: 34px;
  }
  .page-about .about-timeline__stamp {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
    margin-bottom: 0;
    padding-top: 2px;
  }
}

/* ---------- 双通道 ---------- */
.page-about .about-dual {
  padding: var(--about-pad-y) 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-dual__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
  margin-top: clamp(30px, 4.5vw, 50px);
}

.page-about .about-dual__card {
  position: relative;
  padding: clamp(24px, 3vw, 36px);
  background: var(--ink-mid);
  border: 1px solid var(--line-soft);
  clip-path: polygon(0 0, calc(100% - var(--about-cut)) 0, 100% var(--about-cut), 100% 100%, var(--about-cut) 100%, 0 calc(100% - var(--about-cut)));
}

.page-about .about-dual__card--rail {
  box-shadow: inset 0 3px 0 0 var(--cyan);
}

.page-about .about-dual__card--hub {
  box-shadow: inset 0 3px 0 0 var(--amber);
  background: linear-gradient(150deg, rgba(16, 38, 63, 0.96), rgba(10, 26, 47, 0.72));
}

.page-about .about-dual__card h3 {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(20px, 2.2vw, 26px);
  line-height: 1.3;
  letter-spacing: -0.015em;
  color: var(--cream);
  margin: 16px 0 10px;
}

.page-about .about-dual__card > p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--text-dim);
}

.page-about .about-dual__card ul {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  gap: 11px;
}

.page-about .about-dual__card li {
  position: relative;
  padding-left: 20px;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--text);
}

.page-about .about-dual__card li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 10px;
  height: 1px;
  background: var(--cyan);
}

.page-about .about-dual__card--hub li::before {
  background: var(--amber);
}

.page-about .about-dual__figure {
  margin-top: clamp(32px, 5vw, 58px);
}

@media (min-width: 820px) {
  .page-about .about-dual__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 26px;
  }
  .page-about .about-dual__card--hub {
    transform: translateY(26px);
  }
  .page-about .about-dual__figure {
    margin-top: clamp(52px, 6vw, 80px);
  }
}

/* ---------- 服务版图 ---------- */
.page-about .about-map {
  padding: var(--about-pad-y) 0;
  background: var(--cream);
  color: var(--ink-deep);
}

.page-about .about-map .eyebrow {
  color: var(--clay);
}

.page-about .about-map__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 52px);
}

.page-about .about-map__intro h2 {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(26px, 3.6vw, 40px);
  line-height: 1.15;
  letter-spacing: -0.025em;
  color: var(--ink-deep);
  margin: 12px 0 0;
  max-width: 24ch;
}

.page-about .about-map__intro p {
  margin: 16px 0 0;
  max-width: 58ch;
  font-size: 15.5px;
  line-height: 1.82;
  color: #3C4A5A;
}

.page-about .about-map__stats {
  display: grid;
  gap: 0;
  align-content: start;
  border-top: 1px solid rgba(10, 26, 47, 0.16);
}

.page-about .about-stat {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 4px;
  padding: 20px 0 20px 18px;
  border-bottom: 1px solid rgba(10, 26, 47, 0.16);
  border-left: 3px solid var(--stone);
}

.page-about .about-stat--cyan { border-left-color: var(--cyan); }
.page-about .about-stat--amber { border-left-color: var(--amber); }
.page-about .about-stat--clay { border-left-color: var(--clay); }

.page-about .about-stat__num {
  font-family: var(--font-mono);
  font-size: clamp(32px, 4.4vw, 52px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--ink-deep);
}

.page-about .about-stat__label {
  font-size: 13.5px;
  line-height: 1.6;
  color: #4A5867;
}

.page-about .about-dots {
  margin-top: clamp(30px, 4.5vw, 54px);
  height: clamp(96px, 14vw, 168px);
  background-image: radial-gradient(circle, rgba(10, 26, 47, 0.34) 1.5px, transparent 1.5px);
  background-size: 18px 18px;
  -webkit-mask-image: linear-gradient(100deg, #000 0%, rgba(0, 0, 0, 0.35) 52%, transparent 88%);
  mask-image: linear-gradient(100deg, #000 0%, rgba(0, 0, 0, 0.35) 52%, transparent 88%);
}

@media (min-width: 900px) {
  .page-about .about-map__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    align-items: start;
  }
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  padding: var(--about-pad-y) 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-team__bars {
  list-style: none;
  margin: clamp(30px, 4.5vw, 50px) 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-team__bar {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  grid-template-areas:
    "name num"
    "track track";
  gap: 10px 16px;
  align-items: center;
  padding: 15px 18px;
  background: rgba(16, 38, 63, 0.5);
  border: 1px solid transparent;
  border-left: 3px solid var(--line);
  transition: border-color 220ms ease, background-color 220ms ease, transform 220ms ease;
}

.page-about .about-team__bar:hover,
.page-about .about-team__bar:focus-within {
  border-left-color: var(--cyan);
  background: rgba(16, 38, 63, 0.94);
  transform: translateX(4px);
}

.page-about .about-team__name {
  grid-area: name;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 16px;
  letter-spacing: -0.01em;
  color: var(--cream);
}

.page-about .about-team__num {
  grid-area: num;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  color: var(--cyan);
  white-space: nowrap;
}

.page-about .about-team__track {
  grid-area: track;
  display: block;
  height: 8px;
  background: rgba(107, 118, 131, 0.22);
  overflow: hidden;
}

.page-about .about-team__fill {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--cyan), rgba(47, 216, 216, 0.45));
}

.page-about .about-team__bar--a .about-team__fill { width: 28.1%; }
.page-about .about-team__bar--b .about-team__fill { width: 21.9%; }
.page-about .about-team__bar--c .about-team__fill { width: 18.8%; }
.page-about .about-team__bar--d .about-team__fill { width: 15.6%; }
.page-about .about-team__bar--e .about-team__fill { width: 15.6%; background: linear-gradient(90deg, var(--amber), rgba(242, 167, 59, 0.4)); }

.page-about .about-team__notes {
  margin-top: clamp(28px, 4vw, 44px);
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-team__notes p {
  margin: 0;
  padding: 16px 0 16px 16px;
  border-bottom: 1px solid var(--line-soft);
  border-left: 2px solid transparent;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--text-dim);
}

.page-about .about-team__notes p strong {
  color: var(--cream);
  font-weight: 700;
}

.page-about .about-team__figure {
  margin-top: clamp(32px, 4.5vw, 54px);
}

@media (min-width: 760px) {
  .page-about .about-team__bar {
    grid-template-columns: 150px minmax(0, 1fr) 62px;
    grid-template-areas: "name track num";
    gap: 18px;
  }
  .page-about .about-team__num {
    text-align: right;
  }
  .page-about .about-team__notes {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(24px, 4vw, 56px);
  }
}

@media (min-width: 1080px) {
  .page-about .about-team__notes {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 资质 ---------- */
.page-about .about-proof {
  padding: var(--about-pad-y) 0;
  background: linear-gradient(180deg, transparent, rgba(5, 13, 24, 0.6));
}

.page-about .about-proof__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
  margin-top: clamp(30px, 4.5vw, 50px);
}

.page-about .about-proof__card h3 {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(19px, 2.1vw, 24px);
  line-height: 1.32;
  letter-spacing: -0.015em;
  color: var(--cream);
  margin: 16px 0 10px;
}

.page-about .about-proof__card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--text-dim);
}

.page-about .about-proof__card--clay {
  border-color: rgba(181, 106, 74, 0.42);
}

.page-about .about-proof__foot {
  margin: clamp(30px, 4vw, 48px) 0 0;
  padding: 22px 0 0;
  border-top: 1px solid var(--line-soft);
  max-width: 76ch;
  font-size: 15px;
  line-height: 1.82;
  color: var(--text-dim);
}

@media (min-width: 760px) {
  .page-about .about-proof__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  padding: clamp(52px, 7vw, 92px) 0 clamp(64px, 8vw, 108px);
  border-top: 1px solid var(--line);
}

.page-about .about-next__links {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: clamp(26px, 3.5vw, 38px);
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .about-next__link {
  display: flex;
  flex-direction: column;
  gap: 7px;
  padding: 22px 24px;
  background: var(--ink-deep);
  text-decoration: none;
  position: relative;
  transition: background-color 200ms ease;
}

.page-about .about-next__link::after {
  content: "→";
  position: absolute;
  right: 22px;
  top: 22px;
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--stone);
  transition: color 200ms ease, transform 200ms ease;
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  background: var(--ink-mid);
}

.page-about .about-next__link:hover::after,
.page-about .about-next__link:focus-visible::after {
  color: var(--amber);
  transform: translateX(3px);
}

.page-about .about-next__link-title {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 17px;
  letter-spacing: -0.01em;
  color: var(--cream);
}

.page-about .about-next__link-desc {
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--text-dim);
  padding-right: 30px;
}

@media (min-width: 720px) {
  .page-about .about-next__links {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1080px) {
  .page-about .about-next__links {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 420px) {
  .page-about .about-hero__aside {
    padding: 18px 16px 18px 18px;
  }
  .page-about .about-milestones li {
    grid-template-columns: 54px minmax(0, 1fr);
    gap: 10px;
  }
  .page-about .about-dual__card,
  .page-about .about-proof__card {
    padding: 20px 18px;
  }
  .page-about .about-next__link {
    padding: 20px 18px;
  }
  .page-about .about-next__link::after {
    right: 18px;
    top: 20px;
  }
}
<<<END>>>