.page-about {
  --about-rule: rgba(40, 64, 95, 0.16);
  --about-rule-dark: rgba(159, 178, 201, 0.22);
  --about-indigo: #6E8EE8;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  background: var(--navy);
  color: #fff;
  padding: clamp(26px, 4vw, 44px) 0 clamp(46px, 7vw, 92px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(53, 242, 192, 0.22) 1px, transparent 1px);
  background-size: 26px 26px;
  opacity: 0.35;
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: -30%;
  right: -18%;
  width: 66%;
  height: 150%;
  background: radial-gradient(circle at 60% 42%, rgba(53, 242, 192, 0.14), transparent 68%);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 2;
}

.page-about .breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.02em;
  color: var(--muted);
  margin-bottom: clamp(24px, 4vw, 44px);
}

.page-about .breadcrumb a {
  color: rgba(255, 255, 255, 0.66);
  text-decoration: none;
  transition: color 0.18s var(--ease);
}

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

.page-about .breadcrumb__sep {
  color: rgba(159, 178, 201, 0.45);
}

.page-about .breadcrumb__now {
  color: var(--mint);
}

.page-about .eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted-ink);
  margin: 0 0 14px;
}

.page-about .about-hero .eyebrow {
  color: var(--mint);
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.15rem, 6.6vw, 5rem);
  line-height: 1.02;
  letter-spacing: -0.035em;
  margin: 0 0 0.42em;
  max-width: 19ch;
}

.page-about .about-hero__title em {
  font-style: normal;
  background-image: linear-gradient(
    transparent 78%,
    rgba(53, 242, 192, 0.45) 78%,
    rgba(53, 242, 192, 0.45) 92%,
    transparent 92%
  );
}

.page-about .about-hero__lede {
  max-width: 54ch;
  color: rgba(255, 255, 255, 0.76);
  font-size: clamp(0.98rem, 1.15vw, 1.08rem);
  line-height: 1.8;
  margin: 0;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px 18px;
  margin-top: clamp(32px, 5vw, 56px);
  padding-top: 24px;
  border-top: 1px solid var(--about-rule-dark);
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}

.page-about .about-stat__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: clamp(1.28rem, 2.4vw, 1.85rem);
  letter-spacing: -0.02em;
  color: var(--mint);
  line-height: 1.1;
}

.page-about .about-stat__label {
  font-size: 0.78rem;
  line-height: 1.5;
  color: rgba(255, 255, 255, 0.6);
}

.page-about .about-hero__chart {
  position: absolute;
  right: -6%;
  bottom: -4%;
  width: min(660px, 78%);
  height: auto;
  opacity: 0.5;
  pointer-events: none;
  z-index: 1;
}

/* ---------- 通用区块 ---------- */
.page-about .about-sec {
  padding: clamp(44px, 6.5vw, 92px) 0;
}

.page-about .about-sec--paper {
  background: #fff;
}

.page-about .about-head {
  max-width: 62ch;
  margin-bottom: clamp(26px, 4vw, 46px);
}

.page-about .about-head h2,
.page-about .origin__body h2,
.page-about .collab__body h2,
.page-about .capacity__body h2,
.page-about .principles h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.55rem, 3.3vw, 2.6rem);
  line-height: 1.14;
  letter-spacing: -0.022em;
  margin: 0;
  color: var(--ink);
}

.page-about .about-head__sub {
  margin: 16px 0 0;
  font-size: 1rem;
  line-height: 1.75;
  color: var(--muted-ink);
  max-width: 56ch;
}

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

.page-about .about-fig__frame {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius);
  border: 1px solid var(--about-rule);
  background: var(--panel);
}

.page-about .about-fig__frame--dark {
  border-color: var(--about-rule-dark);
}

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

.page-about .about-fig__cap {
  margin: 12px 0 0;
  font-size: 0.8rem;
  line-height: 1.65;
  color: var(--muted-ink);
}

.page-about .about-fig__cap--dark {
  color: var(--muted);
}

/* ---------- 起点 ---------- */
.page-about .origin__grid {
  display: grid;
  gap: clamp(22px, 4vw, 56px);
}

.page-about .origin__lead {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.page-about .origin__year {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: clamp(3.6rem, 15vw, 9.5rem);
  line-height: 0.82;
  letter-spacing: -0.06em;
  color: transparent;
  -webkit-text-stroke: 1.4px var(--edge);
  overflow: hidden;
}

.page-about .origin__note {
  margin: 0;
  max-width: 24ch;
  font-size: 0.86rem;
  line-height: 1.7;
  color: var(--muted-ink);
  padding-left: 12px;
  border-left: 2px solid var(--mint);
}

.page-about .origin__body p {
  margin: 16px 0 0;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--ink);
  max-width: 64ch;
}

/* ---------- 时间轴 ---------- */
.page-about .timeline__track {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .tm-node {
  border-top: 1px solid var(--about-rule);
  padding: 18px 6px 20px 0;
  transition: border-color 0.22s var(--ease), transform 0.22s var(--ease);
}

.page-about .tm-node:hover,
.page-about .tm-node:focus-within {
  border-top-color: var(--mint);
  transform: translateY(-2px);
}

.page-about .tm-node__idx {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 0.74rem;
  letter-spacing: 0.16em;
  color: var(--mint-deep);
  margin-bottom: 10px;
}

.page-about .tm-node__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.06rem;
  line-height: 1.4;
  letter-spacing: -0.01em;
  margin: 0 0 8px;
  color: var(--ink);
}

.page-about .tm-node__text {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.72;
  color: var(--ink);
}

.page-about .tm-node__detail {
  margin: 8px 0 0;
  font-size: 0.82rem;
  line-height: 1.68;
  color: var(--muted-ink);
}

.page-about .timeline__fig {
  margin-top: clamp(30px, 4.5vw, 52px);
}

/* ---------- 团队与流程 ---------- */
.page-about .collab__grid {
  display: grid;
  gap: clamp(28px, 4.5vw, 56px);
}

.page-about .collab__body > p {
  margin: 16px 0 0;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--ink);
  max-width: 60ch;
}

.page-about .team-list {
  display: grid;
  gap: 0;
  margin-top: 26px;
}

.page-about .team-item {
  border-top: 1px solid var(--about-rule);
  padding: 16px 0 16px 14px;
  position: relative;
}

.page-about .team-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 16px;
  bottom: 16px;
  width: 3px;
  border-radius: 2px;
  background: var(--edge);
}

.page-about .team-item--data::before {
  background: var(--mint);
}

.page-about .team-item--edit::before {
  background: var(--gold);
}

.page-about .team-item--product::before {
  background: var(--about-indigo);
}

.page-about .team-item__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  margin: 0 0 6px;
  color: var(--ink);
}

.page-about .team-item__desc {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.72;
  color: var(--muted-ink);
}

.page-about .flow__lead {
  margin: 30px 0 0;
  font-size: 0.88rem;
  color: var(--muted-ink);
}

.page-about .flow {
  display: grid;
  gap: 14px;
  margin-top: 14px;
}

.page-about .flow__step {
  position: relative;
  padding: 16px 16px 18px;
  background: var(--paper);
  border: 1px solid var(--about-rule);
  border-radius: var(--radius-sm);
}

.page-about .flow__num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--mint);
  color: var(--navy);
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.8rem;
  margin-bottom: 10px;
}

.page-about .flow__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.96rem;
  margin: 0 0 6px;
  color: var(--ink);
}

.page-about .flow__text {
  margin: 0;
  font-size: 0.84rem;
  line-height: 1.7;
  color: var(--muted-ink);
}

/* ---------- 六类栏目 ---------- */
.page-about .cats__index {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  list-style: none;
  margin: 0 0 clamp(26px, 4vw, 40px);
  padding: 0;
}

.page-about .cat-chip {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 9px 15px;
  border: 1px solid var(--about-rule);
  border-radius: 999px;
  background: var(--paper);
  color: var(--ink);
  font-size: 0.85rem;
  font-weight: 500;
  text-decoration: none;
  transition: border-color 0.18s var(--ease), transform 0.18s var(--ease), background 0.18s var(--ease);
}

.page-about .cat-chip::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 2px;
  background: var(--chip, var(--edge));
  flex: none;
}

.page-about .cat-chip:hover,
.page-about .cat-chip:focus-visible {
  border-color: var(--chip, var(--edge));
  transform: translateY(-2px);
}

.page-about .cat-chip--draw { --chip: var(--red); }
.page-about .cat-chip--trend { --chip: var(--mint-deep); }
.page-about .cat-chip--history { --chip: var(--gold); }
.page-about .cat-chip--version { --chip: var(--about-indigo); }
.page-about .cat-chip--tablet { --chip: var(--dot); }
.page-about .cat-chip--help { --chip: var(--muted-ink); }

.page-about .cats__list {
  display: grid;
  gap: 0;
}

.page-about .cat-item {
  border-top: 1px solid var(--about-rule);
  padding: 20px 0 22px;
  scroll-margin-top: 96px;
}

.page-about .cat-item__name {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.02rem;
  margin: 0 0 8px;
  color: var(--ink);
}

.page-about .cat-item__name::before {
  content: "";
  width: 10px;
  height: 10px;
  border-radius: 2px;
  background: var(--chip, var(--edge));
  flex: none;
}

.page-about .cat-item--draw { --chip: var(--red); }
.page-about .cat-item--trend { --chip: var(--mint-deep); }
.page-about .cat-item--history { --chip: var(--gold); }
.page-about .cat-item--version { --chip: var(--about-indigo); }
.page-about .cat-item--tablet { --chip: var(--dot); }
.page-about .cat-item--help { --chip: var(--muted-ink); }

.page-about .cat-item__text {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.8;
  color: var(--muted-ink);
  max-width: 70ch;
}

.page-about .cat-item__text a {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--mint);
  padding-bottom: 1px;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-about .cat-item__text a:hover,
.page-about .cat-item__text a:focus-visible {
  color: var(--mint-deep);
  border-color: var(--mint-deep);
}

/* ---------- 服务能力 ---------- */
.page-about .capacity {
  background: var(--navy);
  color: #fff;
  position: relative;
  overflow: hidden;
}

.page-about .capacity::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(53, 242, 192, 0.16) 1px, transparent 1px);
  background-size: 30px 30px;
  opacity: 0.3;
  pointer-events: none;
}

.page-about .capacity__grid {
  position: relative;
  display: grid;
  gap: clamp(28px, 4.5vw, 56px);
}

.page-about .capacity .eyebrow {
  color: var(--mint);
}

.page-about .capacity__body h2 {
  color: #fff;
  margin-top: 0;
}

.page-about .capacity__sub {
  margin: 14px 0 0;
  font-size: 0.96rem;
  line-height: 1.78;
  color: rgba(255, 255, 255, 0.66);
  max-width: 52ch;
}

.page-about .capacity__rows {
  margin-top: 26px;
  border-top: 1px solid var(--about-rule-dark);
}

.page-about .cap-row {
  display: grid;
  grid-template-columns: minmax(96px, auto) minmax(0, 1fr);
  gap: 4px 18px;
  align-items: start;
  padding: 16px 0;
  border-bottom: 1px solid var(--about-rule-dark);
}

.page-about .cap-row__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: clamp(1.05rem, 2vw, 1.35rem);
  line-height: 1.3;
  color: var(--mint);
  letter-spacing: -0.02em;
}

.page-about .cap-row__body {
  min-width: 0;
}

.page-about .cap-row__label {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.94rem;
  color: #fff;
}

.page-about .cap-row__desc {
  margin: 5px 0 0;
  font-size: 0.84rem;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.58);
}

.page-about .capacity__more {
  margin: 24px 0 0;
  font-size: 0.9rem;
  line-height: 1.75;
  color: rgba(255, 255, 255, 0.66);
}

.page-about .capacity__more a {
  color: var(--mint);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 242, 192, 0.45);
}

.page-about .capacity__more a:hover,
.page-about .capacity__more a:focus-visible {
  color: var(--mint-bright);
  border-color: var(--mint-bright);
}

/* ---------- 原则与反馈 ---------- */
.page-about .principles {
  max-width: 68ch;
}

.page-about .principle-list {
  margin-top: 22px;
}

.page-about .principle {
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr);
  gap: 12px;
  padding: 20px 0;
  border-top: 1px solid var(--about-rule);
}

.page-about .principle__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  color: var(--mint-deep);
  padding-top: 4px;
}

.page-about .principle__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.02rem;
  margin: 0 0 8px;
  color: var(--ink);
}

.page-about .principle__text {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.8;
  color: var(--muted-ink);
}

.page-about .about-cta {
  margin-top: 32px;
  padding: clamp(20px, 3vw, 30px);
  background: #fff;
  border: 1px solid var(--about-rule);
  border-left: 3px solid var(--mint);
  border-radius: var(--radius);
  display: grid;
  gap: 20px;
}

.page-about .about-cta__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.14rem;
  margin: 0 0 10px;
  color: var(--ink);
}

.page-about .about-cta__text {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--muted-ink);
}

.page-about .about-cta__text .mono {
  font-family: var(--font-mono);
  color: var(--ink);
  font-size: 0.88rem;
}

.page-about .about-cta__meta {
  margin: 12px 0 0;
  font-size: 0.78rem;
  letter-spacing: 0.01em;
  color: var(--muted-ink);
}

.page-about .about-cta__btn {
  justify-self: start;
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .flow__step:not(:last-child)::after {
    content: "";
    position: absolute;
    top: 30px;
    right: -9px;
    width: 8px;
    height: 8px;
    border-top: 1.5px solid var(--mint-deep);
    border-right: 1.5px solid var(--mint-deep);
    transform: rotate(45deg);
  }

  .page-about .cat-item {
    display: grid;
    grid-template-columns: 180px minmax(0, 1fr);
    gap: 8px 28px;
    align-items: start;
  }

  .page-about .cat-item__name {
    margin-bottom: 0;
  }

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }

  .page-about .about-cta__btn {
    justify-self: end;
  }
}

@media (min-width: 900px) {
  .page-about .origin__grid {
    grid-template-columns: 0.85fr 1.35fr;
    align-items: start;
  }

  .page-about .collab__grid {
    grid-template-columns: 1.12fr 0.88fr;
    align-items: start;
  }

  .page-about .capacity__grid {
    grid-template-columns: 0.9fr 1.1fr;
    align-items: start;
  }

  .page-about .capacity__fig {
    position: sticky;
    top: 32px;
  }

  .page-about .about-hero__chart {
    width: min(700px, 56%);
    right: 0;
    bottom: 0;
  }
}

@media (min-width: 940px) {
  .page-about .timeline__track {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 0 20px;
  }

  .page-about .tm-node {
    padding-right: 12px;
  }

  .page-about .tm-node__title {
    font-size: 1rem;
  }

  .page-about .tm-node__text {
    font-size: 0.86rem;
  }

  .page-about .tm-node__detail {
    font-size: 0.79rem;
  }
}

@media (min-width: 1200px) {
  .page-about .about-hero__title {
    max-width: 17ch;
  }

  .page-about .principles {
    padding-left: 8px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tm-node,
  .page-about .cat-chip,
  .page-about .breadcrumb a {
    transition: none;
  }

  .page-about .tm-node:hover,
  .page-about .tm-node:focus-within,
  .page-about .cat-chip:hover,
  .page-about .cat-chip:focus-visible {
    transform: none;
  }
}
<<<END>>>