.page-about {
  --ab-line: rgba(15, 42, 68, .14);
  --ab-line-dark: rgba(247, 245, 240, .16);
  --ab-soft: #EFEBE3;
  --ab-pad: clamp(44px, 7vw, 88px);
  background: var(--paper);
  color: var(--ink);
}

.page-about a:focus-visible,
.page-about summary:focus-visible {
  outline: 2px solid var(--gold-bright);
  outline-offset: 3px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: 22px 0 var(--ab-pad);
}
.page-about .about-hero__grid {
  display: grid;
  gap: 30px;
  margin-top: 24px;
}
.page-about .about-hero__text {
  max-width: 660px;
}
.page-about .about-hero__text .eyebrow {
  color: var(--violet);
  letter-spacing: .18em;
}
.page-about .about-hero__text h1 {
  margin: 12px 0 18px;
  font-family: var(--font-display);
  font-size: clamp(30px, 7.4vw, 52px);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -.02em;
  color: var(--blue-900);
}
.page-about .about-hero__text .lede {
  max-width: 58ch;
  font-size: 17px;
  line-height: 1.85;
  color: #2C3A47;
}
.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}
.page-about .about-hero__figure {
  margin: 0;
  padding: 10px;
  background: #fff;
  border: 1px solid var(--ab-line);
  border-radius: var(--r-news);
  box-shadow: var(--layer-shadow);
}
.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: calc(var(--r-news) - 4px);
}
.page-about .about-figcap {
  margin: 10px 2px 0;
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--grey);
}

/* 数据条 */
.page-about .about-stats {
  list-style: none;
  margin: 42px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--ab-line);
  border: 1px solid var(--ab-line);
  border-radius: var(--r-service);
  overflow: hidden;
}
.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 16px;
  background: var(--paper);
}
.page-about .about-stat__num {
  font-size: 23px;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--blue-900);
}
.page-about .about-stat__label {
  font-size: 13px;
  line-height: 1.6;
  color: #4A5A68;
}

/* ---------- 章节索引条 ---------- */
.page-about .about-index-wrap {
  padding: 16px 0;
  background: var(--blue-800);
}
.page-about .about-index {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 4px;
  scrollbar-width: thin;
}
.page-about .about-index__link {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border: 1px solid var(--ab-line-dark);
  border-radius: 999px;
  font-size: 14px;
  color: #D5E1EC;
  text-decoration: none;
  white-space: nowrap;
  transition: border-color var(--ease), color var(--ease), background var(--ease);
}
.page-about .about-index__link .mono {
  font-size: 12px;
  color: var(--gold);
}
.page-about .about-index__link:hover {
  border-color: var(--gold-bright);
  color: #fff;
}
.page-about .about-index__link[aria-current="true"] {
  background: var(--gold);
  border-color: var(--gold);
  color: var(--blue-900);
}
.page-about .about-index__link[aria-current="true"] .mono {
  color: var(--blue-900);
}

/* ---------- 通用标题组 ---------- */
.page-about .about-head {
  max-width: 760px;
}
.page-about .about-head .eyebrow {
  color: var(--violet);
  letter-spacing: .18em;
}
.page-about .about-head h2 {
  margin: 10px 0 14px;
  font-family: var(--font-display);
  font-size: clamp(25px, 5.2vw, 36px);
  font-weight: 800;
  line-height: 1.22;
  letter-spacing: -.02em;
  color: var(--blue-900);
}
.page-about .about-head .lede {
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.85;
  color: #4A5A68;
}

/* ---------- 01 我们是谁 ---------- */
.page-about .about-who {
  padding: var(--ab-pad) 0;
}
.page-about .about-who__grid {
  display: grid;
  gap: 32px;
  margin-top: 30px;
}
.page-about .about-who__body p {
  margin: 0 0 1.1em;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.9;
  color: #2C3A47;
}
.page-about .about-duties {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}
.page-about .about-duty {
  padding: 16px 18px;
  background: #fff;
  border: 1px solid var(--ab-line);
  border-left: 3px solid var(--gold);
  border-radius: var(--r-archive);
}
.page-about .about-duty__idx {
  margin: 0;
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--violet);
}
.page-about .about-duty h3 {
  margin: 7px 0 8px;
  font-size: 17px;
  font-weight: 600;
  color: var(--blue-900);
}
.page-about .about-duty p:last-child {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: #4A5A68;
}

/* ---------- 02 队伍 ---------- */
.page-about .about-team {
  padding: var(--ab-pad) 0;
  background: var(--blue-900);
  color: var(--paper);
}
.page-about .about-team .about-head h2 {
  color: #fff;
}
.page-about .about-team .about-head .eyebrow {
  color: var(--gold);
}
.page-about .about-team .about-head .lede {
  color: #AFC2D2;
}
.page-about .about-team__grid {
  display: grid;
  gap: 34px;
  margin-top: 32px;
}
.page-about .about-bars {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 22px;
}
.page-about .about-bar {
  padding-top: 16px;
  border-top: 1px solid var(--ab-line-dark);
}
.page-about .about-bar__head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
}
.page-about .about-bar__name {
  font-size: 17px;
  font-weight: 600;
  color: #fff;
}
.page-about .about-bar__num {
  font-size: 15px;
  letter-spacing: .08em;
  color: var(--gold);
}
.page-about .about-bar__track {
  height: 10px;
  margin: 12px 0;
  background: rgba(247, 245, 240, .12);
  border-radius: 999px;
  overflow: hidden;
}
.page-about .about-bar__fill {
  display: block;
  width: var(--w, 20%);
  height: 100%;
  border-radius: 999px;
  transition: filter var(--ease);
}
.page-about .about-bar__fill--a { --w: 38.9%; background: linear-gradient(90deg, var(--gold), var(--gold-bright)); }
.page-about .about-bar__fill--b { --w: 22.2%; background: linear-gradient(90deg, var(--violet), #A08FBC); }
.page-about .about-bar__fill--c { --w: 22.2%; background: linear-gradient(90deg, var(--mint), #7FD0B2); }
.page-about .about-bar__fill--d { --w: 16.7%; background: linear-gradient(90deg, var(--wine), #B06068); }
.page-about .about-bar__note {
  margin: 0;
  max-width: 60ch;
  font-size: 14px;
  line-height: 1.8;
  color: #A6BACB;
  transition: color var(--ease);
}
.page-about .about-bar:hover .about-bar__fill {
  filter: brightness(1.16);
}
.page-about .about-bar:hover .about-bar__note {
  color: #DCE7EF;
}
.page-about .about-team__figure {
  margin: 0;
  padding: 10px;
  background: rgba(247, 245, 240, .06);
  border: 1px solid var(--ab-line-dark);
  border-radius: var(--r-news);
}
.page-about .about-team__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border-radius: calc(var(--r-news) - 4px);
}
.page-about .about-team__figure .about-figcap {
  color: #8FA3B5;
}
.page-about .about-team__foot {
  margin: 34px 0 0;
  max-width: 70ch;
  padding-top: 20px;
  border-top: 1px solid var(--ab-line-dark);
  font-size: 15px;
  line-height: 1.9;
  color: #C7D6E2;
}

/* ---------- 03 时间轴 ---------- */
.page-about .about-journey {
  padding: var(--ab-pad) 0;
}
.page-about .about-timeline {
  list-style: none;
  position: relative;
  margin: 34px 0 0;
  padding: 0 0 0 24px;
}
.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--mint), rgba(79, 169, 138, .12));
}
.page-about .about-tl {
  position: relative;
  margin: 0 0 12px;
}
.page-about .about-tl::before {
  content: "";
  position: absolute;
  left: -24px;
  top: 18px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--paper);
  border: 3px solid var(--mint);
}
.page-about .about-tl__item {
  background: #fff;
  border: 1px solid var(--ab-line);
  border-radius: var(--r-archive);
  padding: 4px 18px;
}
.page-about .about-tl__sum {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 6px 14px;
  padding: 14px 0;
  cursor: pointer;
  list-style: none;
}
.page-about .about-tl__sum::-webkit-details-marker {
  display: none;
}
.page-about .about-tl__sum::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 18px;
  color: var(--gold);
}
.page-about .about-tl__item[open] .about-tl__sum::after {
  content: "−";
}
.page-about .about-tl__year {
  font-size: 21px;
  font-weight: 700;
  letter-spacing: .06em;
  color: var(--blue-900);
}
.page-about .about-tl__title {
  font-size: 16.5px;
  font-weight: 600;
  color: var(--blue-800);
}
.page-about .about-tl__body {
  padding: 0 0 16px;
}
.page-about .about-tl__body p {
  margin: 0;
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.85;
  color: #4A5A68;
}

/* ---------- 04 服务过的站点 ---------- */
.page-about .about-sites {
  padding: var(--ab-pad) 0;
  background: var(--ab-soft);
}
.page-about .about-types {
  display: grid;
  gap: 20px;
  margin-top: 32px;
}
.page-about .about-type {
  position: relative;
  padding: 22px 20px;
  background: #fff;
  border: 1px solid var(--ab-line);
  border-radius: var(--r-archive);
  box-shadow: 3px 3px 0 rgba(15, 42, 68, .06);
  transition: transform var(--ease), box-shadow var(--ease);
}
.page-about .about-type::after {
  content: "";
  position: absolute;
  inset: 6px;
  border: 1px solid rgba(15, 42, 68, .07);
  border-radius: 2px;
  pointer-events: none;
}
.page-about .about-type__idx {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--violet);
}
.page-about .about-type h3 {
  margin: 0 0 12px;
  font-size: 19px;
  font-weight: 700;
  color: var(--blue-900);
}
.page-about .about-type p {
  margin: 0 0 10px;
  font-size: 14.5px;
  line-height: 1.8;
  color: #4A5A68;
}
.page-about .about-type p:last-child {
  margin-bottom: 0;
}
.page-about .about-type__k {
  color: var(--blue-800);
  font-weight: 600;
}
.page-about .about-sites__foot {
  margin: 30px 0 0;
  max-width: 66ch;
  font-size: 15px;
  line-height: 1.85;
  color: #3B4A57;
}

/* ---------- 05 为什么选我们 ---------- */
.page-about .about-why {
  padding: var(--ab-pad) 0;
}
.page-about .about-why__grid {
  display: grid;
  gap: 28px;
  margin-top: 32px;
}
.page-about .about-reason {
  padding-top: 18px;
  border-top: 2px solid var(--blue-900);
}
.page-about .about-reason__idx {
  margin: 0;
  font-size: 13px;
  letter-spacing: .16em;
  color: var(--gold);
}
.page-about .about-reason h3 {
  margin: 10px 0 12px;
  font-size: 20px;
  font-weight: 700;
  color: var(--blue-900);
}
.page-about .about-reason p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: #4A5A68;
}
.page-about .about-reason__fact {
  display: inline-block;
  margin-top: 16px;
  padding: 5px 10px;
  background: rgba(217, 164, 65, .14);
  border-radius: var(--r-archive);
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--blue-800);
}

/* ---------- 06 协作网络 ---------- */
.page-about .about-partners {
  padding: var(--ab-pad) 0;
}
.page-about .about-partners__grid {
  display: grid;
  gap: 30px;
  margin-top: 30px;
}
.page-about .about-partners__body p {
  margin: 0 0 1.1em;
  max-width: 64ch;
  font-size: 16px;
  line-height: 1.9;
  color: #2C3A47;
}
.page-about .about-partners__list {
  list-style: none;
  margin: 0 0 1.1em;
  padding: 0;
  display: grid;
  gap: 10px;
}
.page-about .about-partners__list li {
  padding: 12px 16px;
  background: #fff;
  border: 1px solid var(--ab-line);
  border-left: 3px solid var(--violet);
  border-radius: var(--r-archive);
  font-size: 15px;
  line-height: 1.7;
  color: #3B4A57;
}
.page-about .about-partners__list .mono {
  margin-right: 8px;
  color: var(--blue-900);
  font-weight: 700;
}
.page-about .about-link {
  color: var(--blue-800);
  border-bottom: 1px solid var(--gold);
  text-decoration: none;
  transition: color var(--ease);
}
.page-about .about-link:hover {
  color: var(--wine);
}
.page-about .about-partners__fig {
  margin: 0;
  padding: 10px;
  background: #fff;
  border: 1px solid var(--ab-line);
  border-radius: var(--r-news);
  box-shadow: var(--layer-shadow);
}
.page-about .about-partners__fig img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border-radius: calc(var(--r-news) - 4px);
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  padding: var(--ab-pad) 0;
  background: var(--blue-900);
  color: var(--paper);
}
.page-about .about-cta .about-head h2 {
  color: #fff;
}
.page-about .about-cta .about-head .eyebrow {
  color: var(--gold);
}
.page-about .about-cta .about-head .lede {
  color: #AFC2D2;
}
.page-about .about-cta__links {
  display: grid;
  gap: 12px;
  margin-top: 28px;
}
.page-about .about-cta__link {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 14px;
  padding: 16px 18px;
  border: 1px solid var(--ab-line-dark);
  border-radius: var(--r-service);
  font-size: 15px;
  line-height: 1.6;
  color: #E4EDF4;
  text-decoration: none;
  transition: border-color var(--ease), transform var(--ease), background var(--ease);
}
.page-about .about-cta__link .mono {
  flex: 0 0 auto;
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--gold);
}
.page-about .about-cta__link:hover {
  border-color: var(--gold-bright);
  background: rgba(217, 164, 65, .10);
  transform: translateY(-1px);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, 1fr);
  }
  .page-about .about-types {
    grid-template-columns: repeat(2, 1fr);
  }
  .page-about .about-cta__links {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: 1.02fr .98fr;
    align-items: center;
    gap: 44px;
  }
  .page-about .about-who__grid {
    grid-template-columns: 1.15fr .85fr;
    gap: 44px;
  }
  .page-about .about-team__grid {
    grid-template-columns: 1.25fr .75fr;
    align-items: start;
    gap: 46px;
  }
  .page-about .about-why__grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
  }
  .page-about .about-partners__grid {
    grid-template-columns: 1.15fr .85fr;
    align-items: start;
    gap: 46px;
  }
  .page-about .about-timeline {
    padding-left: 30px;
  }
  .page-about .about-tl::before {
    left: -30px;
  }
  .page-about .about-type--1 { transform: rotate(-.5deg); }
  .page-about .about-type--3 { transform: rotate(.5deg); }
  .page-about .about-type--1:hover,
  .page-about .about-type--3:hover {
    transform: rotate(0deg);
    box-shadow: 5px 5px 0 rgba(15, 42, 68, .12);
  }
  .page-about .about-tl__item {
    padding: 4px 22px;
  }
}
<<<END>>>