.page-about {
  --about-paper-ink: #241a18;
  --about-paper-soft: #5c4b45;
  --about-gap: clamp(20px, 3vw, 32px);
  overflow-x: clip;
  background: var(--ink-0);
}

.page-about .section--paper {
  --text-1: var(--about-paper-ink);
  --text-2: var(--about-paper-soft);
  --line-gold: rgba(140, 14, 34, .24);
  --line-soft: rgba(36, 26, 24, .14);
  color: var(--about-paper-ink);
  background:
    radial-gradient(80% 55% at 88% 6%, rgba(217, 164, 65, .22), transparent 60%),
    linear-gradient(168deg, var(--paper) 0%, var(--paper) 62%, var(--paper-deep) 100%);
}

.page-about .figure {
  margin: 0;
  overflow: hidden;
  border-radius: var(--radius-organic);
  border: 1px solid rgba(217, 164, 65, .22);
}

.page-about .figure__media {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  max-width: 100%;
  height: auto;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-block: clamp(20px, 4vw, 36px) clamp(56px, 8vw, 108px);
  border-bottom: 1px solid rgba(140, 14, 34, .26);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -12%;
  bottom: -18%;
  width: 58%;
  height: 46%;
  background: radial-gradient(closest-side, rgba(196, 18, 47, .22), transparent 70%);
  pointer-events: none;
}

.page-about .about-hero__crumb {
  margin-bottom: clamp(20px, 3vw, 34px);
  font-size: 13px;
}

.page-about .about-hero__crumb .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  color: var(--about-paper-soft);
}

.page-about .about-hero__crumb a {
  color: var(--crimson);
  text-decoration: none;
  border-bottom: 1px solid rgba(140, 14, 34, .3);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(28px, 4vw, 52px);
}

.page-about .about-hero__title {
  margin: 10px 0 20px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 6.4vw, 56px);
  line-height: 1.16;
  letter-spacing: -.01em;
  color: var(--about-paper-ink);
}

.page-about .about-hero__text p {
  max-width: 38em;
  margin: 0 0 16px;
  color: var(--about-paper-soft);
  line-height: 1.8;
}

.page-about .about-hero__text a {
  color: var(--crimson);
}

.page-about .about-hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 26px 0 34px;
}

.page-about .about-hero__media {
  aspect-ratio: 4 / 5;
  max-height: 520px;
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px 18px;
  margin: 0;
  padding-top: 24px;
  border-top: 1px solid rgba(140, 14, 34, .22);
}

.page-about .about-facts__item dt {
  color: var(--about-paper-soft);
  letter-spacing: .08em;
  text-transform: none;
}

.page-about .about-facts__item dd {
  margin: 6px 0 0;
  display: flex;
  align-items: baseline;
  gap: 6px;
}

.page-about .about-facts__value {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(24px, 4vw, 30px);
  font-weight: 700;
  color: var(--crimson);
}

.page-about .about-facts__unit {
  font-size: 13px;
  color: var(--about-paper-soft);
}

/* ---------- 起点与今天 ---------- */
.page-about .about-origin {
  border-bottom: 1px solid rgba(36, 26, 24, .16);
}

.page-about .about-origin__grid {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
  margin-top: 22px;
}

.page-about .about-origin__body p {
  max-width: 36em;
  margin: 0 0 16px;
  line-height: 1.8;
  color: var(--about-paper-soft);
}

.page-about .about-origin__body a {
  color: var(--crimson);
  border-bottom: 1px solid rgba(140, 14, 34, .35);
  text-decoration: none;
}

.page-about .about-origin__quote {
  align-self: start;
  padding: 26px 24px;
  border-left: 4px solid var(--crimson);
  border-radius: 0 var(--radius-organic) var(--radius-organic) 0;
  background: rgba(255, 255, 255, .42);
}

.page-about .about-origin__quote blockquote {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(19px, 2.6vw, 24px);
  line-height: 1.5;
  color: var(--about-paper-ink);
}

/* ---------- 时间线 ---------- */
.page-about .about-milestones {
  position: relative;
}

.page-about .about-timeline {
  position: relative;
  margin: clamp(30px, 5vw, 52px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--gold) 0%, rgba(217, 164, 65, .38) 55%, rgba(199, 242, 74, .35) 100%);
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 30px 34px;
}

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

.page-about .about-timeline__node {
  position: absolute;
  left: 3px;
  top: 7px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--lime);
  box-shadow: 0 0 0 5px rgba(199, 242, 74, .14);
}

.page-about .about-timeline__era {
  margin: 0 0 6px;
  color: var(--gold);
  letter-spacing: .1em;
}

.page-about .about-timeline__title {
  margin: 0 0 8px;
  font-family: var(--font-sans);
  font-weight: 800;
  font-size: clamp(18px, 2.6vw, 22px);
  color: var(--text-1);
}

.page-about .about-timeline__item > p {
  max-width: 46em;
  margin: 0 0 12px;
  color: var(--text-2);
  line-height: 1.75;
}

.page-about .about-timeline__more summary {
  cursor: pointer;
  display: inline-block;
  padding: 6px 14px;
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--gold-soft);
  border: 1px solid var(--line-gold);
  border-radius: 999px;
  transition: background-color .25s var(--ease-out), color .25s var(--ease-out);
}

.page-about .about-timeline__more summary:hover,
.page-about .about-timeline__more summary:focus-visible {
  background: rgba(217, 164, 65, .14);
  color: var(--gold);
}

.page-about .about-timeline__more[open] summary {
  background: rgba(217, 164, 65, .18);
  color: var(--gold);
}

.page-about .about-timeline__more p {
  max-width: 44em;
  margin: 14px 0 0;
  padding-left: 16px;
  border-left: 2px solid rgba(199, 242, 74, .5);
  color: var(--text-2);
  line-height: 1.75;
}

/* ---------- 团队 ---------- */
.page-about .about-team__grid {
  display: grid;
  gap: var(--about-gap);
  margin-top: clamp(28px, 4vw, 44px);
}

.page-about .about-team__card {
  padding: clamp(22px, 3vw, 30px);
  border-radius: var(--radius-organic);
  border: 1px solid var(--line-soft);
  background: linear-gradient(160deg, rgba(140, 14, 34, .28), rgba(11, 10, 11, .55));
  transition: transform .3s var(--ease-out), border-color .3s var(--ease-out), box-shadow .3s var(--ease-out);
}

.page-about .about-team__card:hover,
.page-about .about-team__card:focus-within {
  transform: translateY(-6px);
  border-color: var(--line-gold);
  box-shadow: 0 22px 40px -28px rgba(217, 164, 65, .55);
}

.page-about .about-team__card .label {
  color: var(--gold);
  letter-spacing: .12em;
}

.page-about .about-team__count {
  display: flex;
  align-items: baseline;
  gap: 6px;
  margin: 10px 0 12px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(34px, 6vw, 46px);
  font-weight: 700;
  line-height: 1;
  color: var(--lime);
}

.page-about .about-team__unit {
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 500;
  color: var(--text-2);
}

.page-about .about-team__sum {
  margin: 0 0 16px;
  color: var(--text-2);
  line-height: 1.75;
}

.page-about .about-team__list {
  margin: 0;
  padding: 0;
  list-style: none;
  opacity: .74;
  transition: opacity .3s var(--ease-out);
}

.page-about .about-team__card:hover .about-team__list,
.page-about .about-team__card:focus-within .about-team__list {
  opacity: 1;
}

.page-about .about-team__list li {
  position: relative;
  padding-left: 18px;
  margin-bottom: 10px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--text-1);
}

.page-about .about-team__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 8px;
  height: 2px;
  background: var(--gold);
}

.page-about .about-team__media {
  margin-top: clamp(30px, 5vw, 52px);
  aspect-ratio: 16 / 9;
}

/* ---------- 数据流程 ---------- */
.page-about .about-flow__steps {
  position: relative;
  margin: clamp(28px, 4vw, 46px) 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 18px;
}

.page-about .about-flow__step {
  padding: 22px 20px;
  border-radius: var(--radius-organic);
  border: 1px solid var(--line-soft);
  background: rgba(26, 17, 19, .72);
}

.page-about .about-flow__index {
  display: block;
  font-size: 13px;
  letter-spacing: .18em;
  color: var(--orange);
  margin-bottom: 10px;
}

.page-about .about-flow__step h3 {
  margin: 0 0 8px;
  font-family: var(--font-sans);
  font-weight: 800;
  font-size: 18px;
  color: var(--text-1);
}

.page-about .about-flow__step p {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--text-2);
}

.page-about .about-flow__note {
  margin-top: 24px;
  padding: 20px 22px;
  border-left: 3px solid var(--gold);
  border-radius: 0 var(--radius-organic) var(--radius-organic) 0;
  background: rgba(217, 164, 65, .08);
}

.page-about .about-flow__note p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--gold-soft);
}

/* ---------- 协作生态 ---------- */
.page-about .about-coop__grid {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
  align-items: center;
}

.page-about .about-coop__body p {
  max-width: 34em;
  color: var(--text-2);
  line-height: 1.8;
}

.page-about .about-coop__list {
  margin: 22px 0 26px;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-coop__list li {
  padding: 14px 0;
  border-bottom: 1px solid var(--line-soft);
  color: var(--text-2);
  line-height: 1.7;
}

.page-about .about-coop__list strong {
  display: inline-block;
  min-width: 5.6em;
  margin-right: 10px;
  color: var(--gold);
  font-weight: 700;
}

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

.page-about .about-coop__media {
  aspect-ratio: 4 / 3;
}

/* ---------- 服务准则 ---------- */
.page-about .about-principles__list {
  display: grid;
  gap: 16px;
  margin: clamp(26px, 4vw, 40px) 0 0;
  padding: 0;
  list-style: none;
  counter-reset: principle;
}

.page-about .about-principles__item {
  counter-increment: principle;
  position: relative;
  padding: 22px 22px 22px 62px;
  border-radius: var(--radius-organic);
  border: 1px solid rgba(36, 26, 24, .16);
  background: rgba(255, 255, 255, .5);
}

.page-about .about-principles__item::before {
  content: counter(principle, decimal-leading-zero);
  position: absolute;
  left: 22px;
  top: 22px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 14px;
  letter-spacing: .06em;
  color: var(--crimson);
}

.page-about .about-principles__item h3 {
  margin: 0 0 8px;
  font-family: var(--font-sans);
  font-weight: 800;
  font-size: 18px;
  color: var(--about-paper-ink);
}

.page-about .about-principles__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--about-paper-soft);
}

.page-about .about-principles__cta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  margin-top: clamp(30px, 4vw, 46px);
  padding-top: 26px;
  border-top: 1px solid rgba(140, 14, 34, .24);
}

.page-about .about-principles__cta p {
  margin: 0;
  max-width: 30em;
  color: var(--about-paper-soft);
  line-height: 1.75;
}

.page-about .about-principles__cta > div {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 窄屏微调 ---------- */
@media (max-width: 520px) {
  .page-about .about-hero__media {
    aspect-ratio: 4 / 3;
    max-height: 320px;
  }

  .page-about .about-coop__list strong {
    display: block;
    min-width: 0;
    margin: 0 0 4px;
  }
}

/* ---------- 桌面栅格 ---------- */
@media (min-width: 861px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }

  .page-about .about-hero__media {
    aspect-ratio: 5 / 7;
    max-height: none;
  }

  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: start;
  }

  .page-about .about-origin__quote {
    margin-top: 46px;
  }

  .page-about .about-team__grid {
    grid-template-columns: 1.15fr 1fr .88fr;
    align-items: start;
  }

  .page-about .about-team__card:nth-child(2) {
    margin-top: 34px;
  }

  .page-about .about-team__card:nth-child(3) {
    margin-top: 68px;
  }

  .page-about .about-flow__steps {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 22px;
  }

  .page-about .about-flow__steps::before {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    top: 46px;
    height: 1px;
    background: linear-gradient(90deg, rgba(217, 164, 65, .45), rgba(199, 242, 74, .35), rgba(217, 164, 65, .1));
  }

  .page-about .about-flow__step {
    position: relative;
    padding-top: 26px;
  }

  .page-about .about-coop__grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
  }

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

  .page-about .about-principles__item {
    padding: 26px 24px 26px 24px;
  }

  .page-about .about-principles__item::before {
    position: static;
    display: block;
    margin-bottom: 12px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-team__card,
  .page-about .about-team__list,
  .page-about .about-timeline__more summary {
    transition: none;
  }
}