.page-about {
  --about-pad: clamp(16px, 2.6vw, 28px);
  --about-block: clamp(24px, 4vw, 46px);
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(26px, 4.6vw, 56px) 0 clamp(32px, 5.4vw, 70px);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--line-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--line-soft) 1px, transparent 1px);
  background-size: 72px 72px;
  pointer-events: none;
  -webkit-mask-image: radial-gradient(120% 78% at 72% 4%, #000 18%, transparent 74%);
  mask-image: radial-gradient(120% 78% at 72% 4%, #000 18%, transparent 74%);
}

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

.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 0 clamp(16px, 3vw, 30px);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: rgba(14, 27, 42, .55);
}

.page-about .breadcrumb a {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  padding-bottom: 1px;
  transition: color .28s var(--ease), border-color .28s var(--ease);
}

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

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(22px, 3.4vw, 40px);
}

.page-about .about-hero__copy .eyebrow {
  margin: 0 0 clamp(10px, 1.8vw, 18px);
}

.page-about .about-hero h1 {
  margin: 0 0 clamp(14px, 2.4vw, 24px);
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(31px, 6.2vw, 66px);
  line-height: 1.04;
  letter-spacing: -.012em;
}

.page-about .about-hero__lead {
  max-width: 52ch;
  margin: 0 0 clamp(20px, 3vw, 30px);
  font-size: clamp(15px, 1.6vw, 18px);
  line-height: 1.8;
  color: rgba(14, 27, 42, .78);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-facts__item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 14px 16px;
  background: var(--paper-lite);
}

.page-about .about-facts dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: rgba(14, 27, 42, .52);
}

.page-about .about-facts dd {
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: 4px;
}

.page-about .about-facts__num {
  font-size: clamp(24px, 3.2vw, 32px);
  font-weight: 700;
  line-height: 1;
  color: var(--red);
}

.page-about .about-facts__unit {
  font-size: 12px;
  color: rgba(14, 27, 42, .6);
}

.page-about .about-hero__media {
  margin: var(--about-block) 0 0;
}

/* ---------- 发展历程 ---------- */
.page-about .about-stages__lead {
  max-width: 58ch;
  margin: clamp(12px, 2vw, 18px) 0 0;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.8;
  color: rgba(14, 27, 42, .74);
}

.page-about .about-era {
  list-style: none;
  display: grid;
  gap: 1px;
  margin: clamp(24px, 4vw, 42px) 0 0;
  padding: 0;
  background: var(--line);
  border-top: 3px solid var(--ink);
  border-bottom: 1px solid var(--line);
}

.page-about .about-era__item {
  position: relative;
  background: var(--paper-lite);
}

.page-about .about-era__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--mist);
  transition: background .3s var(--ease);
}

.page-about .about-era__item[data-open]::before {
  background: var(--red);
}

.page-about .about-era__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 12px;
  padding: clamp(15px, 2.4vw, 22px) var(--about-pad);
}

.page-about .about-era__idx {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .08em;
  color: var(--paper);
  background: var(--ink);
  padding: 3px 8px;
  line-height: 1.4;
}

.page-about .about-era__title {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(17px, 2.2vw, 23px);
  line-height: 1.24;
}

.page-about .about-era__toggle {
  flex: none;
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  padding: 0;
  border: 1px solid var(--line);
  background: transparent;
  cursor: pointer;
  border-radius: 0;
  transition: border-color .28s var(--ease), background .28s var(--ease);
}

.page-about .about-era__toggle:hover,
.page-about .about-era__toggle:focus-visible {
  border-color: var(--red);
  background: rgba(216, 38, 44, .06);
}

.page-about .about-era__sign {
  position: relative;
  display: block;
  width: 12px;
  height: 2px;
  background: var(--ink);
}

.page-about .about-era__sign::after {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--ink);
  transform: rotate(90deg);
  transition: transform .3s var(--ease);
}

.page-about .about-era__item[data-open] .about-era__sign::after {
  transform: rotate(0deg);
}

.page-about .about-era__panel {
  display: grid;
  grid-template-rows: 1fr;
  opacity: 1;
  transition: grid-template-rows .4s var(--ease), opacity .28s var(--ease);
}

.page-about .about-era__item:not([data-open]) .about-era__panel {
  grid-template-rows: 0fr;
  opacity: 0;
}

.page-about .about-era__inner {
  min-height: 0;
  overflow: hidden;
  padding: 0 var(--about-pad) clamp(18px, 2.8vw, 26px);
}

.page-about .about-era__inner p {
  margin: 0;
  max-width: 78ch;
  font-size: clamp(14px, 1.5vw, 16px);
  line-height: 1.85;
  color: rgba(14, 27, 42, .8);
}

/* ---------- 版本演进 ---------- */
.page-about .about-version__panel {
  padding: clamp(24px, 4vw, 52px);
}

.page-about .about-version__grid {
  display: grid;
  gap: clamp(24px, 3.6vw, 44px);
}

.page-about .about-version__eyebrow {
  color: var(--gold);
  margin: 0 0 clamp(10px, 1.6vw, 16px);
}

.page-about .about-version__copy h2 {
  margin: 0 0 clamp(14px, 2.2vw, 20px);
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(26px, 4.2vw, 44px);
  line-height: 1.08;
  color: var(--paper);
}

.page-about .about-version__copy p {
  margin: 0;
  max-width: 62ch;
  font-size: clamp(14px, 1.5vw, 16.5px);
  line-height: 1.85;
  color: rgba(244, 239, 230, .82);
}

.page-about .about-version__side {
  display: grid;
  gap: clamp(18px, 2.6vw, 26px);
  align-content: start;
}

.page-about .about-version__meter {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 8px 12px;
}

.page-about .about-version__meter-k {
  font-size: 12px;
  letter-spacing: .1em;
  color: rgba(244, 239, 230, .6);
}

.page-about .about-version__meter-v {
  font-size: 14px;
  font-weight: 700;
  color: var(--gold);
}

.page-about .about-version__track {
  grid-column: 1 / -1;
  position: relative;
  display: block;
  height: 8px;
  background: rgba(244, 239, 230, .14);
  overflow: hidden;
}

.page-about .about-version__fill {
  display: block;
  width: 42%;
  height: 100%;
  background: linear-gradient(90deg, var(--red), var(--gold));
}

.page-about .about-version__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-version__list li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 12px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line-invert);
  font-size: 14px;
  line-height: 1.7;
  color: rgba(244, 239, 230, .8);
}

.page-about .about-version__list li .mono {
  color: var(--cyan);
  font-size: 12px;
  padding-top: 3px;
}

.page-about .about-version__note {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: rgba(244, 239, 230, .58);
}

/* ---------- 团队 ---------- */
.page-about .about-team__grid {
  display: grid;
  gap: clamp(24px, 3.6vw, 46px);
}

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

.page-about .about-team__copy .eyebrow {
  margin: 0 0 clamp(10px, 1.6vw, 16px);
}

.page-about .about-team__copy h2 {
  margin: 0 0 clamp(12px, 2vw, 18px);
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(25px, 4vw, 42px);
  line-height: 1.1;
}

.page-about .about-team__copy > p {
  margin: 0 0 clamp(20px, 3vw, 30px);
  max-width: 62ch;
  font-size: clamp(14px, 1.5vw, 16.5px);
  line-height: 1.85;
  color: rgba(14, 27, 42, .78);
}

.page-about .about-team__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border-top: 1px solid var(--line);
}

.page-about .about-team__row {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  padding: 14px 16px;
  background: var(--paper);
  transition: background .28s var(--ease);
}

.page-about .about-team__row:hover {
  background: var(--paper-lite);
}

.page-about .about-team__num {
  font-size: clamp(20px, 2.6vw, 26px);
  font-weight: 700;
  line-height: 1;
  color: var(--red);
  padding-top: 2px;
}

.page-about .about-team__row h3 {
  margin: 0 0 4px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 16px;
  letter-spacing: .01em;
}

.page-about .about-team__row p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.72;
  color: rgba(14, 27, 42, .72);
}

/* ---------- 资质与荣誉 ---------- */
.page-about .about-honor__lead {
  max-width: 60ch;
  margin: clamp(12px, 2vw, 18px) 0 clamp(22px, 3.4vw, 34px);
  font-size: clamp(14px, 1.5vw, 16.5px);
  line-height: 1.85;
  color: rgba(14, 27, 42, .76);
}

.page-about .about-honor__grid {
  list-style: none;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin: 0;
  padding: 0;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-honor__cell {
  position: relative;
  background: var(--paper-lite);
  padding: clamp(18px, 2.6vw, 26px);
  transition: background .28s var(--ease);
}

.page-about .about-honor__cell::after {
  content: "";
  position: absolute;
  right: 12px;
  bottom: 12px;
  width: 10px;
  height: 10px;
  border-right: 1px solid var(--mist);
  border-bottom: 1px solid var(--mist);
  transition: border-color .28s var(--ease), transform .28s var(--ease);
}

.page-about .about-honor__cell:hover {
  background: #fff;
}

.page-about .about-honor__cell:hover::after {
  border-color: var(--cyan);
  transform: translate(2px, 2px);
}

.page-about .about-honor__cell .tag {
  display: inline-block;
  margin-bottom: 10px;
}

.page-about .about-honor__cell h3 {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(16px, 1.9vw, 19px);
  line-height: 1.28;
}

.page-about .about-honor__cell p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: rgba(14, 27, 42, .7);
}

/* ---------- 合作生态 ---------- */
.page-about .about-eco__head {
  display: grid;
  gap: clamp(20px, 3vw, 38px);
  margin-bottom: clamp(22px, 3.4vw, 36px);
}

.page-about .about-eco__intro h2 {
  margin: 0 0 clamp(12px, 2vw, 18px);
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(25px, 4vw, 42px);
  line-height: 1.1;
}

.page-about .about-eco__intro p {
  margin: 0;
  max-width: 60ch;
  font-size: clamp(14px, 1.5vw, 16.5px);
  line-height: 1.85;
  color: rgba(14, 27, 42, .78);
}

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

.page-about .about-eco__list {
  list-style: none;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin: 0;
  padding: 0;
}

.page-about .about-eco__node {
  display: grid;
  gap: 8px;
  padding: clamp(16px, 2.4vw, 24px);
  background: var(--paper-lite);
  border: 1px solid var(--line);
  border-top: 3px solid var(--ink);
  transition: border-top-color .28s var(--ease), background .28s var(--ease);
}

.page-about .about-eco__node--content:hover {
  border-top-color: var(--red);
}

.page-about .about-eco__node--channel:hover {
  border-top-color: var(--gold);
}

.page-about .about-eco__node--tech:hover {
  border-top-color: var(--cyan);
}

.page-about .about-eco__count {
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 700;
  line-height: 1;
  color: var(--ink);
}

.page-about .about-eco__node h3 {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 17px;
}

.page-about .about-eco__node p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: rgba(14, 27, 42, .72);
}

/* ---------- 下一步入口 ---------- */
.page-about .about-next__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin-top: clamp(18px, 2.8vw, 28px);
}

.page-about .about-next__card {
  display: grid;
  gap: 6px;
  padding: clamp(16px, 2.4vw, 22px);
  background: var(--paper-lite);
  border: 1px solid var(--line);
  border-left: 3px solid var(--red);
  color: inherit;
  text-decoration: none;
  transition: background .28s var(--ease), border-left-color .28s var(--ease), transform .28s var(--ease);
}

.page-about .about-next__card:hover,
.page-about .about-next__card:focus-visible {
  background: #fff;
  border-left-color: var(--gold);
  transform: translateX(3px);
}

.page-about .about-next__k {
  font-size: 12px;
  letter-spacing: .1em;
  color: rgba(14, 27, 42, .5);
}

.page-about .about-next__t {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(18px, 2.2vw, 22px);
  line-height: 1.2;
}

.page-about .about-next__d {
  font-size: 13.5px;
  line-height: 1.72;
  color: rgba(14, 27, 42, .72);
}

/* ---------- 响应式 ---------- */
@media (min-width: 560px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-honor__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    align-items: end;
  }

  .page-about .about-version__grid {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, .8fr) minmax(0, 1.2fr);
    align-items: start;
  }

  .page-about .about-eco__head {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
    align-items: center;
  }
}

@media (min-width: 1024px) {
  .page-about .about-honor__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-era__panel,
  .page-about .about-era__sign::after,
  .page-about .about-era__item::before,
  .page-about .about-next__card,
  .page-about .about-honor__cell::after {
    transition: none;
  }
}