/* ===== 品牌与沿革 · 页面专属样式（作用域 .page-about） ===== */
.page-about {
  --rail-w: 172px;
  --about-chamfer: polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 12px 100%, 0 calc(100% - 12px));
  background: var(--c-black);
  color: var(--c-text-soft);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  background:
    radial-gradient(1100px 560px at 80% -8%, rgba(22, 35, 76, .9), transparent 64%),
    linear-gradient(180deg, #0E0F13 0%, #0B0D12 100%);
  border-bottom: 1px solid var(--c-line);
}

.page-about .about-hero__grid {
  display: grid;
  gap: 30px;
  padding-top: 26px;
  padding-bottom: 38px;
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  color: var(--c-paper);
  font-family: var(--font-head);
  font-size: clamp(38px, 6.4vw, 76px);
  line-height: 1.04;
  letter-spacing: .01em;
}

.page-about .about-hero__lede {
  margin: 20px 0 0;
  max-width: 62ch;
  font-size: clamp(16px, 1.5vw, 18.5px);
  line-height: 1.85;
  color: var(--c-text-soft);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  background: var(--c-line);
  border: 1px solid var(--c-line);
  clip-path: var(--chamfer-sm);
}

.page-about .about-fact {
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 0;
  padding: 16px 14px;
  background: rgba(14, 15, 19, .92);
}

.page-about .about-fact__num {
  font-family: var(--font-data);
  font-size: clamp(21px, 3.4vw, 34px);
  line-height: 1;
  letter-spacing: -.01em;
  color: var(--c-paper);
}

.page-about .about-fact__num--gold {
  color: var(--c-gold);
}

.page-about .about-fact__unit {
  margin-left: 2px;
  font-size: .52em;
}

.page-about .about-fact__label {
  font-size: 12px;
  line-height: 1.5;
  letter-spacing: .06em;
  color: var(--c-stand);
}

.page-about .about-hero__media {
  position: relative;
  margin: 0;
  border-top: 1px solid var(--c-line);
  overflow: hidden;
  aspect-ratio: auto;
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: clamp(200px, 36vw, 420px);
  object-fit: cover;
  filter: saturate(.8) contrast(1.06) brightness(.85);
}

.page-about .about-hero__media .media__cap {
  position: absolute;
  left: 20px;
  right: 20px;
  bottom: 14px;
  margin: 0;
  font-size: 12px;
  letter-spacing: .04em;
  color: rgba(243, 240, 233, .72);
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, .85fr);
    gap: 48px;
    align-items: end;
    padding-top: 40px;
    padding-bottom: 56px;
  }
}

/* ---------- 主体骨架：左刻度 + 右长卷 ---------- */
.page-about .about-shell {
  padding-top: 52px;
  padding-bottom: 72px;
}

.page-about .about-rail {
  margin-bottom: 36px;
}

.page-about .about-rail__label {
  margin: 0 0 12px;
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--c-stand);
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0 0 6px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
}

.page-about .about-rail__list li {
  flex: 0 0 auto;
  list-style: none;
}

.page-about .about-rail__link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 12px;
  text-decoration: none;
  white-space: nowrap;
  color: var(--c-stand);
  background: rgba(27, 30, 38, .6);
  border-left: 2px solid var(--c-line);
  transition: color .18s var(--ease), border-color .18s var(--ease), background-color .18s var(--ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--c-paper);
  border-left-color: var(--c-red);
  background: rgba(200, 16, 46, .12);
}

.page-about .about-rail__year {
  font-family: var(--font-data);
  font-size: 15px;
  letter-spacing: .06em;
}

.page-about .about-rail__desc {
  font-size: 12px;
}

@media (min-width: 1000px) {
  .page-about .about-shell {
    display: grid;
    grid-template-columns: var(--rail-w) minmax(0, 1fr);
    gap: 56px;
    align-items: start;
    padding-top: 72px;
    padding-bottom: 96px;
  }

  .page-about .about-rail {
    position: sticky;
    top: 92px;
    margin-bottom: 0;
  }

  .page-about .about-rail__list {
    display: block;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-rail__list li + li {
    margin-top: 4px;
  }

  .page-about .about-rail__link {
    width: 100%;
  }
}

/* ---------- 章节与色带 ---------- */
.page-about .about-chapter {
  padding-bottom: 56px;
}

.page-about .about-chapter + .about-chapter {
  padding-top: 44px;
  border-top: 1px solid var(--c-line);
}

.page-about .about-chapter > .band {
  margin-bottom: 20px;
}

.page-about .t-chapter {
  margin: 0 0 18px;
  font-family: var(--font-head);
  font-size: clamp(26px, 3.2vw, 40px);
  line-height: 1.14;
  letter-spacing: .02em;
  color: var(--c-paper);
}

.page-about .about-lead {
  margin: 0 0 30px;
  max-width: 66ch;
  font-size: clamp(16px, 1.5vw, 18px);
  line-height: 1.85;
  color: var(--c-text-soft);
}

.page-about .about-note {
  margin: 28px 0 0;
  max-width: 70ch;
  padding: 18px 20px;
  background: var(--c-carbon);
  border-left: 3px solid var(--c-red);
  font-size: 15px;
  line-height: 1.8;
  color: var(--c-text-soft);
}

@media (min-width: 1000px) {
  .page-about .about-chapter {
    padding-bottom: 84px;
  }
}

/* ---------- 沿革节点 ---------- */
.page-about .about-nodes {
  list-style: none;
  margin: 0 0 0 6px;
  padding: 0;
  border-left: 2px solid var(--c-indigo-light);
}

.page-about .about-node {
  position: relative;
  padding: 4px 0 30px 24px;
}

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

.page-about .about-node::before {
  content: "";
  position: absolute;
  left: -8px;
  top: 9px;
  width: 12px;
  height: 12px;
  background: var(--c-black);
  border: 2px solid var(--c-red);
  transform: rotate(45deg);
  transition: background-color .22s var(--ease);
}

.page-about .about-node:hover::before {
  background: var(--c-red);
}

.page-about .about-node__year {
  margin: 0 0 6px;
  font-family: var(--font-data);
  font-size: 13px;
  letter-spacing: .16em;
  color: var(--c-gold);
}

.page-about .about-node .t-sub {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 20px;
  letter-spacing: .02em;
  color: var(--c-paper);
}

.page-about .about-node__text {
  margin: 0;
  max-width: 64ch;
  font-size: 15.5px;
  line-height: 1.82;
  color: var(--c-text-soft);
}

/* ---------- 六类栏目 ---------- */
.page-about .about-columns {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
}

.page-about .about-col {
  position: relative;
  overflow: hidden;
  padding: 20px 18px 22px 22px;
  background: var(--c-carbon);
  border: 1px solid var(--c-line);
  clip-path: var(--chamfer-sm);
  transition: border-color .2s var(--ease), transform .2s var(--ease);
}

.page-about .about-col::before {
  content: "";
  position: absolute;
  left: 0;
  top: 16px;
  bottom: 16px;
  width: 3px;
  background: var(--c-red);
  transform: scaleY(0);
  transform-origin: top center;
  transition: transform .26s var(--ease);
}

.page-about .about-col:hover {
  border-color: var(--c-line-strong);
  transform: translateY(-2px);
}

.page-about .about-col:hover::before {
  transform: scaleY(1);
}

.page-about .about-col__index {
  margin: 0;
  font-family: var(--font-data);
  font-size: 11.5px;
  letter-spacing: .16em;
  color: var(--c-stand);
}

.page-about .about-col__title {
  margin: 8px 0 10px;
  font-family: var(--font-head);
  font-size: 21px;
  letter-spacing: .04em;
  color: var(--c-paper);
}

.page-about .about-col__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--c-text-soft);
}

.page-about .about-col__meta {
  margin: 14px 0 0;
  padding-top: 10px;
  border-top: 1px dashed var(--c-line);
  font-family: var(--font-data);
  font-size: 12.5px;
  letter-spacing: .04em;
  color: var(--c-gold);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: 28px;
  margin-top: 4px;
}

.page-about .about-team__copy > p {
  margin: 0 0 16px;
  max-width: 60ch;
  font-size: 15.8px;
  line-height: 1.85;
  color: var(--c-text-soft);
}

.page-about .about-split {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  border-top: 1px solid var(--c-line);
}

.page-about .about-split li {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 2px;
  border-bottom: 1px solid var(--c-line);
  font-size: 14.5px;
  color: var(--c-text-soft);
}

.page-about .about-split__num {
  font-family: var(--font-data);
  font-size: 20px;
  color: var(--c-gold);
}

.page-about .about-team__media {
  margin: 0;
  aspect-ratio: auto;
}

.page-about .about-team__media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--c-line);
  filter: saturate(.85) contrast(1.04);
}

.page-about .about-team__media .media__cap {
  display: block;
  margin-top: 10px;
  font-size: 12.5px;
  color: var(--c-stand);
}

.page-about .about-stats {
  display: grid;
  gap: 1px;
  margin-top: 34px;
  background: var(--c-line);
  border: 1px solid var(--c-line);
}

.page-about .about-stat {
  position: relative;
  overflow: hidden;
  padding: 24px 22px;
  background: var(--c-black);
}

.page-about .about-stat::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--c-red);
  transform: scaleY(0);
  transform-origin: bottom center;
  transition: transform .3s var(--ease);
}

.page-about .about-stat:hover::after {
  transform: scaleY(1);
}

.page-about .about-stat__num {
  margin: 0;
  font-family: var(--font-data);
  font-size: clamp(34px, 4.6vw, 54px);
  line-height: 1;
  color: var(--c-gold);
}

.page-about .about-stat__label {
  margin: 10px 0 0;
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--c-stand);
}

@media (min-width: 700px) {
  .page-about .about-stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 860px) {
  .page-about .about-team {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.02fr);
    gap: 40px;
    align-items: start;
  }
}

/* ---------- 档案成型（夜靛分区 + 纵向流程） ---------- */
.page-about .about-indigo {
  position: relative;
  padding: 30px 22px 34px;
  background: linear-gradient(158deg, var(--c-indigo) 0%, #101937 62%, #0C1226 100%);
  border: 1px solid var(--c-indigo-light);
  clip-path: var(--about-chamfer);
}

.page-about .about-indigo .t-chapter {
  margin-top: 0;
}

.page-about .about-archive {
  display: grid;
  gap: 32px;
}

.page-about .about-archive__main > p {
  margin: 0 0 26px;
  max-width: 62ch;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--c-text-soft);
}

.page-about .about-flow {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--c-indigo-light);
}

.page-about .about-step {
  display: grid;
  grid-template-columns: 74px minmax(0, 1fr);
  gap: 14px;
  padding: 18px 0;
  border-bottom: 1px solid var(--c-indigo-light);
}

.page-about .about-step__num {
  padding-top: 4px;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--c-red);
}

.page-about .about-step__title {
  margin: 0 0 6px;
  font-family: var(--font-head);
  font-size: 19px;
  letter-spacing: .03em;
  color: var(--c-paper);
}

.page-about .about-step__text {
  margin: 0;
  font-size: 14.8px;
  line-height: 1.78;
  color: var(--c-text-soft);
}

.page-about .about-step.is-visible {
  animation: aboutStepIn .55s var(--ease) both;
}

.page-about .about-step:nth-child(2).is-visible { animation-delay: .07s; }
.page-about .about-step:nth-child(3).is-visible { animation-delay: .14s; }
.page-about .about-step:nth-child(4).is-visible { animation-delay: .21s; }
.page-about .about-step:nth-child(5).is-visible { animation-delay: .28s; }

@keyframes aboutStepIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: none; }
}

.page-about .about-archive__media {
  margin: 0;
  aspect-ratio: auto;
}

.page-about .about-archive__media img {
  display: block;
  width: 100%;
  max-width: 320px;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--c-indigo-light);
}

.page-about .about-archive__media .media__cap {
  display: block;
  margin-top: 12px;
  max-width: 320px;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--c-stand);
}

@media (max-width: 520px) {
  .page-about .about-step {
    grid-template-columns: minmax(0, 1fr);
    gap: 6px;
  }
}

@media (min-width: 760px) {
  .page-about .about-indigo {
    padding: 40px 34px 44px;
  }
}

@media (min-width: 900px) {
  .page-about .about-archive {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, .75fr);
    gap: 40px;
    align-items: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-step.is-visible {
    animation: none;
  }
}

/* ---------- 合作生态 ---------- */
.page-about .about-partners {
  display: grid;
  gap: 12px;
}

.page-about .about-partner {
  position: relative;
  padding: 24px 20px;
  background: linear-gradient(150deg, var(--c-carbon) 0%, #14161C 100%);
  border: 1px solid var(--c-line);
  clip-path: var(--about-chamfer);
  transition: transform .22s var(--ease), border-color .22s var(--ease);
}

.page-about .about-partner:hover {
  transform: translateY(-3px);
  border-color: var(--c-line-strong);
}

.page-about .about-partner__num {
  margin: 0;
  font-family: var(--font-data);
  font-size: clamp(30px, 4vw, 44px);
  line-height: 1;
  color: var(--c-gold);
}

.page-about .about-partner__title {
  margin: 12px 0 8px;
  font-family: var(--font-head);
  font-size: 18px;
  letter-spacing: .04em;
  color: var(--c-paper);
}

.page-about .about-partner__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--c-text-soft);
}

@media (min-width: 720px) {
  .page-about .about-partners {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 三条承诺与行动入口 ---------- */
.page-about .about-pledges {
  display: grid;
  gap: 14px;
  margin-top: 8px;
}

.page-about .about-pledge {
  padding: 26px 22px 28px;
  background: var(--c-paper);
  color: var(--c-ink);
  border-top: 4px solid var(--c-red);
  clip-path: var(--about-chamfer);
}

.page-about .about-pledge__num {
  margin: 0;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--c-red-deep);
}

.page-about .about-pledge__title {
  margin: 12px 0;
  font-family: var(--font-head);
  font-size: 26px;
  letter-spacing: .06em;
  color: var(--c-ink);
}

.page-about .about-pledge__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(20, 22, 28, .78);
}

.page-about .about-cta {
  display: grid;
  gap: 20px;
  margin-top: 40px;
  padding: 28px 24px;
  background: var(--c-carbon);
  border: 1px solid var(--c-line);
  border-left: 3px solid var(--c-red);
}

.page-about .about-cta__text {
  margin: 0;
  max-width: 58ch;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--c-text-soft);
}

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

@media (min-width: 820px) {
  .page-about .about-pledges {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 32px;
    padding: 30px 32px;
  }
}
<<<END>>>