.page-about {
  --about-cut: 16px;
  --about-body: rgba(247, 250, 248, .8);
  --about-muted: var(--steel);
  background: var(--ink);
  color: var(--paper);
  overflow-x: clip;
}

.page-about p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--about-body);
}

.page-about h2 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 3.4vw, 40px);
  line-height: 1.16;
  letter-spacing: -.02em;
}

.page-about .eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .16em;
  color: var(--cyan);
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  padding-top: clamp(18px, 3vw, 30px);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--steel);
}

.page-about .breadcrumb a {
  color: var(--steel);
  text-decoration: none;
  transition: color var(--dur) var(--ease);
}

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

.page-about .breadcrumb__sep {
  color: rgba(111, 143, 135, .7);
}

.page-about .breadcrumb [aria-current="page"] {
  color: var(--paper);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  padding: 0 0 clamp(54px, 8vw, 100px);
  overflow: hidden;
  background:
    radial-gradient(130% 100% at 88% -12%, rgba(47, 243, 208, .18), transparent 58%),
    linear-gradient(158deg, var(--ink-2) 0%, var(--ink) 60%);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: auto -12% -52% 32%;
  height: 88%;
  z-index: -1;
  background: linear-gradient(205deg, rgba(47, 243, 208, .13), transparent 68%);
  clip-path: polygon(24% 0, 100% 32%, 100% 100%, 0 100%);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(24px, 4vw, 52px);
  margin-top: clamp(26px, 4vw, 46px);
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  max-width: 22ch;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(29px, 4.4vw, 56px);
  line-height: 1.1;
  letter-spacing: -.02em;
}

.page-about .about-hero__name {
  color: var(--cyan-soft);
}

.page-about .about-hero__lede {
  max-width: 46ch;
  font-size: 15.5px;
  line-height: 1.85;
  color: rgba(247, 250, 248, .82);
}

.page-about .about-hero__facts {
  margin: clamp(22px, 3vw, 30px) 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line-dark);
}

.page-about .about-hero__facts li {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 0;
  border-bottom: 1px solid var(--line-dark);
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--about-muted);
}

.page-about .about-hero__facts strong {
  font-family: var(--font-mono);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--cyan-soft);
}

/* ---------- 起点 ---------- */
.page-about .about-origin {
  padding: clamp(50px, 7vw, 86px) 0;
  background: var(--ink);
  border-top: 1px solid var(--line-dark);
}

.page-about .about-origin__grid {
  display: grid;
  gap: clamp(20px, 3vw, 30px);
}

.page-about .about-origin__body p + p {
  margin-top: 14px;
}

/* ---------- 发展节点 ---------- */
.page-about .about-timeline {
  position: relative;
  overflow: hidden;
  padding: clamp(56px, 8vw, 100px) 0 clamp(88px, 11vw, 140px);
  background: linear-gradient(180deg, var(--ink) 0%, var(--ink-3) 100%);
}

.page-about .about-timeline__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.page-about .about-timeline__bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  opacity: .24;
  filter: saturate(.75) contrast(1.05);
}

.page-about .about-timeline__bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, var(--ink) 4%, rgba(11, 42, 36, .5) 46%, var(--ink-3) 96%);
}

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

.page-about .about-timeline__intro {
  margin-top: 12px;
  max-width: 54ch;
}

.page-about .about-timeline__list {
  margin: clamp(28px, 4vw, 46px) 0 0;
  padding: 0;
  list-style: none;
  border-left: 1px solid var(--line-dark);
}

.page-about .about-timeline__item {
  position: relative;
  display: grid;
  gap: 8px;
  padding: 22px 0 22px clamp(22px, 3vw, 40px);
  border-bottom: 1px solid var(--line-dark);
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 30px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(47, 243, 208, .13);
  transition: box-shadow var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .about-timeline__item:hover::before {
  box-shadow: 0 0 0 8px rgba(47, 243, 208, .2);
}

.page-about .about-timeline__item--current::before {
  background: var(--amber);
  box-shadow: 0 0 0 4px rgba(242, 184, 75, .16);
}

.page-about .about-timeline__year {
  font-family: var(--font-mono);
  font-size: clamp(22px, 3vw, 34px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--cyan-soft);
}

.page-about .about-timeline__item--current .about-timeline__year {
  color: var(--amber);
}

.page-about .about-timeline__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-about .about-timeline__content p {
  max-width: 62ch;
}

/* ---------- 编辑团队 ---------- */
.page-about .about-team {
  position: relative;
  padding: clamp(66px, 9vw, 112px) 0 clamp(52px, 7vw, 88px);
  background: var(--sand);
  color: var(--charcoal);
  --about-body: #2c3a36;
  --about-muted: #5d6f69;
}

.page-about .about-team::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: clamp(40px, 7vw, 92px);
  background: var(--ink-3);
  clip-path: polygon(0 0, 100% 0, 0 100%);
  pointer-events: none;
}

.page-about .about-team .eyebrow,
.page-about .about-reach .eyebrow,
.page-about .about-partners .eyebrow {
  color: #1a6b5b;
}

.page-about .about-team__grid {
  display: grid;
  gap: clamp(26px, 4vw, 52px);
}

.page-about .about-team__lede {
  margin-top: 14px;
  max-width: 56ch;
}

.page-about .about-team__groups {
  margin-top: clamp(22px, 3vw, 32px);
  border-top: 1px solid var(--line-light);
}

.page-about .about-team__group {
  border-bottom: 1px solid var(--line-light);
}

.page-about .about-team__group summary {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 12px;
  padding: 16px 30px 16px 0;
  list-style: none;
  cursor: pointer;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  color: var(--charcoal);
}

.page-about .about-team__group summary::-webkit-details-marker {
  display: none;
}

.page-about .about-team__group summary::after {
  content: "+";
  position: absolute;
  right: 4px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 700;
  color: #1a6b5b;
  transition: transform var(--dur) var(--ease);
}

.page-about .about-team__group[open] summary::after {
  content: "−";
}

.page-about .about-team__group summary:focus-visible {
  outline: 2px solid #1a6b5b;
  outline-offset: 3px;
}

.page-about .about-team__group p {
  margin: 0 0 18px;
  max-width: 58ch;
  padding-right: 20px;
}

.page-about .about-team__tag {
  padding: 3px 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .1em;
  color: #1a6b5b;
  background: rgba(26, 107, 91, .1);
  border-radius: 2px;
}

.page-about .about-team__figure {
  margin: 0;
  overflow: hidden;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-cut)), calc(100% - var(--about-cut)) 100%, 0 100%);
  box-shadow: 0 22px 44px -28px rgba(16, 22, 20, .6);
}

.page-about .about-team__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(.85) contrast(1.04);
}

.page-about .about-team__caption {
  padding: 12px 14px;
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: .03em;
  color: #5d6f69;
  background: rgba(255, 255, 255, .55);
}

/* ---------- 覆盖范围 ---------- */
.page-about .about-reach {
  padding: clamp(54px, 7vw, 92px) 0;
  background: var(--paper);
  color: var(--charcoal);
  --about-body: #2c3a36;
  --about-muted: #5d6f69;
}

.page-about .about-reach__grid {
  display: grid;
  gap: clamp(26px, 4vw, 56px);
}

.page-about .about-reach__figure {
  margin: 0;
  overflow: hidden;
  clip-path: polygon(0 0, 100% 0, 100% 100%, var(--about-cut) 100%, 0 calc(100% - var(--about-cut)));
}

.page-about .about-reach__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(.8) contrast(1.05);
}

.page-about .about-reach__body p {
  margin-top: 14px;
  max-width: 56ch;
}

.page-about .about-reach__stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(118px, 1fr));
  gap: 10px;
  margin-top: clamp(24px, 3vw, 34px);
}

.page-about .about-stat {
  padding: 16px 14px 14px;
  background: linear-gradient(158deg, #f3f7f4, var(--sand));
  border-left: 2px solid var(--cyan);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 12px), calc(100% - 12px) 100%, 0 100%);
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .about-stat:hover {
  transform: translateY(-3px);
  box-shadow: 0 16px 28px -20px rgba(11, 42, 36, .55);
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.2vw, 34px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--ink);
}

.page-about .about-stat__num sup {
  font-size: .5em;
  color: #1a6b5b;
}

.page-about .about-stat__label {
  display: block;
  margin-top: 8px;
  font-size: 12px;
  letter-spacing: .06em;
  color: #5d6f69;
}

/* ---------- 合作与专题 ---------- */
.page-about .about-partners {
  padding: clamp(54px, 7vw, 92px) 0;
  background: var(--sand);
  color: var(--charcoal);
  border-top: 1px solid var(--line-light);
  --about-body: #2c3a36;
  --about-muted: #5d6f69;
}

.page-about .about-partners__grid {
  display: grid;
  gap: clamp(22px, 3vw, 36px);
}

.page-about .about-partners__body p + p {
  margin-top: 14px;
}

.page-about .about-partners__list {
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line-light);
}

.page-about .about-partners__list li {
  display: grid;
  gap: 6px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line-light);
}

.page-about .about-partners__name {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .04em;
  color: #1a6b5b;
}

.page-about .about-partners__desc {
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--about-body);
}

/* ---------- 收尾 ---------- */
.page-about .about-trust {
  padding: clamp(56px, 8vw, 100px) 0 clamp(64px, 9vw, 108px);
  background: var(--ink);
  --about-body: rgba(247, 250, 248, .8);
  --about-muted: var(--steel);
}

.page-about .about-trust__panel {
  position: relative;
  padding: clamp(28px, 4vw, 54px);
  border: 1px solid var(--line-dark);
  background:
    radial-gradient(120% 140% at 90% 0%, rgba(47, 243, 208, .16), transparent 62%),
    linear-gradient(150deg, var(--ink-2), var(--ink));
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 26px), calc(100% - 26px) 100%, 0 100%);
}

.page-about .about-trust__text {
  margin-top: 14px;
  max-width: 64ch;
}

.page-about .about-trust__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 18px;
  margin-top: clamp(24px, 3vw, 34px);
}

.page-about .about-trust__link {
  font-size: 14px;
  color: var(--cyan-soft);
  text-decoration: none;
  border-bottom: 1px solid rgba(143, 252, 232, .4);
  padding-bottom: 2px;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-trust__link:hover,
.page-about .about-trust__link:focus-visible {
  color: var(--paper);
  border-color: var(--paper);
}

/* ---------- 响应式 ---------- */
@media (min-width: 760px) {
  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: clamp(28px, 5vw, 72px);
    align-items: start;
  }

  .page-about .about-timeline__item {
    grid-template-columns: 124px minmax(0, 1fr);
    align-items: baseline;
    gap: clamp(16px, 3vw, 38px);
  }

  .page-about .about-partners__list li {
    grid-template-columns: 172px minmax(0, 1fr);
    align-items: baseline;
    gap: clamp(16px, 3vw, 34px);
  }

  .page-about .about-partners__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: clamp(28px, 5vw, 72px);
    align-items: start;
  }
}

@media (min-width: 880px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    align-items: end;
  }
}

@media (min-width: 900px) {
  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    align-items: start;
  }

  .page-about .about-reach__grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    align-items: center;
  }
}

@media (max-width: 420px) {
  .page-about .about-hero__facts li {
    flex-wrap: wrap;
    gap: 4px;
  }

  .page-about .about-stat {
    padding: 14px 12px 12px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-timeline__item::before,
  .page-about .about-stat,
  .page-about .about-trust__link,
  .page-about .breadcrumb a {
    transition: none;
  }

  .page-about .about-stat:hover {
    transform: none;
  }
}