.page-about {
  color: var(--c-paper);
  --about-hair: rgba(0, 229, 208, 0.18);
  --about-soft: rgba(167, 182, 200, 0.16);
}

.page-about .section {
  padding-block: clamp(46px, 7vw, 96px);
}

.page-about .about-eyebrow {
  margin: 0 0 0.9rem;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.24em;
  color: var(--c-cyan);
}

.page-about .section-head {
  max-width: 64ch;
}

.page-about .section-head h2 {
  margin: 0;
  font-size: var(--fz-38);
  font-weight: 900;
  line-height: 1.14;
  letter-spacing: -0.02em;
}

.page-about .about-lede {
  margin: clamp(18px, 2.4vw, 26px) 0 0;
  max-width: 62ch;
  font-size: var(--fz-19);
  line-height: 1.85;
  color: var(--c-mist);
}

.page-about .about-lede--sm {
  margin-top: 1rem;
  font-size: var(--fz-16);
}

/* ---------- 面包屑 ---------- */
.page-about .crumbs {
  margin: 0 0 clamp(20px, 3.2vw, 36px);
  font-size: 0.84rem;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-block: clamp(24px, 4.6vw, 52px) clamp(42px, 7vw, 86px);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(30px, 5vw, 56px);
  align-items: end;
}

.page-about .about-kicker {
  margin: 0 0 1rem;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.24em;
  color: var(--c-cyan);
}

.page-about h1 {
  margin: 0;
  font-size: var(--fz-56);
  font-weight: 900;
  line-height: 1.03;
  letter-spacing: -0.02em;
}

.page-about .about-jump {
  display: inline-flex;
  align-items: center;
  gap: 0.45em;
  margin-top: clamp(22px, 3vw, 34px);
  padding-bottom: 3px;
  color: var(--c-cyan);
  font-size: 0.94rem;
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 229, 208, 0.4);
  transition: color 0.25s var(--ease-out), border-color 0.25s var(--ease-out);
}

.page-about .about-jump:hover,
.page-about .about-jump:focus-visible {
  color: var(--c-cyan-soft);
  border-bottom-color: var(--c-cyan-soft);
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  background: rgba(0, 229, 208, 0.22);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 28px), calc(100% - 28px) 100%, 0 100%);
}

.page-about .about-stat {
  display: flex;
  flex-direction: column-reverse;
  gap: 0.35rem;
  padding: clamp(16px, 2.4vw, 24px);
  background: var(--c-navy);
}

.page-about .about-stat__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(25px, 3.2vw, 36px);
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--c-paper);
}

.page-about .about-stat__label {
  font-size: 0.8rem;
  letter-spacing: 0.05em;
  color: var(--c-mist);
}

/* ---------- 服务版图 ---------- */
.page-about .territory {
  display: grid;
  gap: clamp(28px, 4vw, 52px);
  margin-top: clamp(28px, 4vw, 46px);
}

.page-about .territory__list {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .territory__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 0.9rem;
  padding: 0.9rem 1.1rem;
  background: rgba(18, 58, 94, 0.4);
  border-left: 2px solid rgba(0, 229, 208, 0.5);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%);
  transition: background-color 0.3s var(--ease-out), border-left-color 0.3s var(--ease-out);
}

.page-about .territory__item:hover {
  background: rgba(18, 58, 94, 0.72);
  border-left-color: var(--c-cyan);
}

.page-about .territory__region {
  font-size: 0.92rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--c-cyan);
  white-space: nowrap;
}

.page-about .territory__cities {
  font-size: 0.86rem;
  line-height: 1.7;
  color: var(--c-mist);
}

.page-about .territory__count {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  color: var(--c-paper);
}

.page-about .territory__figure,
.page-about .history__figure,
.page-about .team__figure {
  margin: 0;
}

.page-about .territory__figure img,
.page-about .history__figure img,
.page-about .team__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .territory__figure figcaption,
.page-about .history__figure figcaption,
.page-about .team__figure figcaption {
  margin-top: 0.85rem;
  font-size: 0.8rem;
  line-height: 1.75;
  color: var(--c-mist);
}

/* ---------- 版本沿革 ---------- */
.page-about .history {
  display: grid;
  gap: clamp(30px, 5vw, 56px);
  margin-top: clamp(28px, 4vw, 46px);
}

.page-about .timeline {
  position: relative;
  margin: 0;
  padding: 8px 0 8px 30px;
  list-style: none;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 12px;
  bottom: 12px;
  width: 1px;
  background: linear-gradient(180deg, rgba(0, 229, 208, 0.8), rgba(0, 229, 208, 0.05));
}

.page-about .tl-item {
  position: relative;
  padding-bottom: clamp(26px, 4vw, 40px);
}

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

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 7px;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  border: 1px solid var(--c-cyan);
  background: var(--c-ink);
  transition: background-color 0.3s var(--ease-out), box-shadow 0.3s var(--ease-out);
}

.page-about .tl-item:hover::before,
.page-about .tl-item:focus-within::before {
  background: var(--c-cyan);
  box-shadow: 0 0 0 5px rgba(0, 229, 208, 0.14);
}

.page-about .tl-year {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.16em;
  color: var(--c-cyan);
}

.page-about .tl-title {
  margin: 0.5rem 0 0;
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: -0.01em;
  color: var(--c-paper);
}

.page-about .tl-desc {
  margin: 0.6rem 0 0;
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--c-mist);
}

.page-about .tl-note {
  margin: 0.55rem 0 0;
  font-size: 0.86rem;
  line-height: 1.78;
  color: var(--c-mist);
  opacity: 0.72;
  transform: translateX(-4px);
  transition: opacity 0.3s var(--ease-out), transform 0.3s var(--ease-out), color 0.3s var(--ease-out);
}

.page-about .tl-item:hover .tl-note,
.page-about .tl-item:focus-within .tl-note {
  opacity: 1;
  transform: translateX(0);
  color: var(--c-paper);
}

/* ---------- 页面索引 ---------- */
.page-about .idx-domain {
  display: grid;
  gap: clamp(16px, 2.2vw, 26px);
  padding-top: clamp(24px, 3.4vw, 38px);
  border-top: 1px solid var(--about-hair);
}

.page-about .idx-domain:first-of-type {
  margin-top: clamp(28px, 4vw, 46px);
}

.page-about .idx-domain + .idx-domain {
  margin-top: clamp(30px, 4.4vw, 52px);
}

.page-about .idx-domain__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.2em;
  color: var(--c-cyan);
}

.page-about .idx-domain__name {
  margin: 0.5rem 0 0;
  font-size: var(--fz-26);
  font-weight: 800;
  letter-spacing: -0.01em;
}

.page-about .idx-domain__desc {
  margin: 0.6rem 0 0;
  font-size: 0.86rem;
  line-height: 1.75;
  color: var(--c-mist);
}

.page-about .idx-list {
  margin: 0;
  padding: 0;
  list-style: none;
  columns: 1;
  column-gap: 14px;
}

.page-about .idx-card {
  break-inside: avoid;
  margin: 0 0 14px;
}

.page-about .idx-card__link {
  display: block;
  padding: 18px 20px 20px;
  text-decoration: none;
  color: inherit;
  background:
    linear-gradient(180deg, rgba(0, 229, 208, 0.1), rgba(0, 229, 208, 0) 48%),
    rgba(11, 27, 51, 0.94);
  border-left: 2px solid rgba(0, 229, 208, 0.35);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%);
  transition: border-left-color 0.28s var(--ease-out), transform 0.28s var(--ease-out);
}

.page-about .idx-card__link:hover,
.page-about .idx-card__link:focus-visible {
  border-left-color: var(--c-cyan);
  transform: translateY(-2px);
}

.page-about .idx-card__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  color: var(--c-cyan);
}

.page-about .idx-card__name {
  display: block;
  margin-top: 0.65rem;
  font-size: 1.06rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--c-paper);
}

.page-about .idx-card__desc {
  display: block;
  margin-top: 0.5rem;
  font-size: 0.86rem;
  line-height: 1.72;
  color: var(--c-mist);
}

.page-about .idx-card__meta {
  display: inline-block;
  margin-top: 0.9rem;
  padding: 2px 9px;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  color: var(--c-amber);
  border: 1px solid rgba(255, 194, 75, 0.34);
}

/* ---------- 团队 ---------- */
.page-about .team {
  display: grid;
  gap: clamp(28px, 4vw, 52px);
  margin-top: clamp(28px, 4vw, 46px);
}

.page-about .team__list {
  display: grid;
  gap: clamp(18px, 2.4vw, 26px);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .team__meta {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
}

.page-about .team__name {
  font-size: 1.04rem;
  font-weight: 700;
  color: var(--c-paper);
}

.page-about .team__num {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--c-cyan);
}

.page-about .team__bar {
  height: 4px;
  margin-top: 0.7rem;
  background: var(--about-soft);
}

.page-about .team__bar span {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--c-cyan), var(--c-cyan-soft));
}

.page-about .team__item:nth-child(1) .team__bar span { width: 32%; }
.page-about .team__item:nth-child(2) .team__bar span { width: 22%; }
.page-about .team__item:nth-child(3) .team__bar span { width: 27%; }
.page-about .team__item:nth-child(4) .team__bar span { width: 19%; }

.page-about .team__desc {
  margin: 0.7rem 0 0;
  font-size: 0.87rem;
  line-height: 1.78;
  color: var(--c-mist);
}

/* ---------- 协作与认可 ---------- */
.page-about .eco {
  display: grid;
  gap: clamp(28px, 4vw, 52px);
}

.page-about .eco h2 {
  margin: 0;
  font-size: var(--fz-38);
  font-weight: 900;
  line-height: 1.14;
  letter-spacing: -0.02em;
}

.page-about .eco__p {
  margin: 1.1rem 0 0;
  max-width: 60ch;
  font-size: var(--fz-16);
  line-height: 1.85;
  color: var(--c-mist);
}

.page-about .eco__facts {
  display: grid;
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: rgba(0, 229, 208, 0.22);
  clip-path: polygon(0 0, calc(100% - 26px) 0, 100% 26px, 100% 100%, 0 100%);
}

.page-about .eco__facts li {
  padding: clamp(16px, 2.4vw, 22px);
  background: var(--c-navy);
}

.page-about .eco__facts strong {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(21px, 2.5vw, 29px);
  line-height: 1.15;
  letter-spacing: -0.01em;
  color: var(--c-cyan);
}

.page-about .eco__facts span {
  display: block;
  margin-top: 0.45rem;
  font-size: 0.84rem;
  line-height: 1.72;
  color: var(--c-mist);
}

/* ---------- 桌面布局 ---------- */
@media (min-width: 720px) {
  .page-about .idx-list { columns: 2; }
}

@media (min-width: 940px) {
  .page-about .about-hero__grid {
    grid-template-columns: 1.45fr 1fr;
  }

  .page-about .territory {
    grid-template-columns: 1.05fr 0.95fr;
    align-items: start;
  }

  .page-about .history {
    grid-template-columns: 1fr 0.72fr;
    align-items: start;
  }

  .page-about .history__figure {
    position: sticky;
    top: 92px;
  }

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

  .page-about .eco {
    grid-template-columns: 1.15fr 0.85fr;
    align-items: start;
  }
}

@media (min-width: 1000px) {
  .page-about .idx-domain {
    grid-template-columns: 210px minmax(0, 1fr);
    align-items: start;
  }
}

@media (min-width: 1180px) {
  .page-about .idx-list { columns: 3; }
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-jump,
  .page-about .territory__item,
  .page-about .tl-item::before,
  .page-about .tl-note,
  .page-about .idx-card__link {
    transition: none;
  }

  .page-about .idx-card__link:hover,
  .page-about .idx-card__link:focus-visible {
    transform: none;
  }

  .page-about .tl-note {
    opacity: 1;
    transform: none;
  }
}
<<<END>>>