.page-about {
  background: var(--ink);
  color: var(--paper);
  overflow-x: hidden;
}

.page-about img {
  max-width: 100%;
  height: auto;
}

.page-about .about-crumb {
  padding-top: clamp(16px, 3vw, 28px);
}

/* ============ 首屏 ============ */
.page-about .about-hero {
  position: relative;
  padding: clamp(26px, 4.5vw, 52px) 0 clamp(40px, 6vw, 78px);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(169, 184, 201, .07) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(169, 184, 201, .07) 1px, transparent 1px);
  background-size: 76px 76px;
  pointer-events: none;
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 52px);
}

.page-about h1 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(34px, 6.4vw, 72px);
  line-height: 1.14;
  letter-spacing: .01em;
  color: var(--paper);
}

.page-about .about-hero__intro {
  max-width: 58ch;
  margin: 20px 0 0;
  color: var(--mist);
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(24px, 3.5vw, 34px);
}

.page-about .plate-card {
  position: relative;
  background: var(--ink-2);
  border: 1px solid var(--line-strong);
  padding: clamp(20px, 3vw, 28px);
  align-self: end;
}

.page-about .plate-card::before {
  content: "";
  position: absolute;
  top: -1px;
  left: -1px;
  width: 32px;
  height: 32px;
  border-top: 2px solid var(--gold);
  border-left: 2px solid var(--gold);
  pointer-events: none;
}

.page-about .plate-card__tag {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--gold);
  text-transform: uppercase;
}

.page-about .plate-card__list {
  margin: 0;
  display: grid;
  gap: 0;
}

.page-about .plate-card__list > div {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  padding: 11px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .plate-card__list > div:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .plate-card__list dt {
  margin: 0;
  font-size: 13px;
  color: var(--mist);
  letter-spacing: .04em;
}

.page-about .plate-card__list dd {
  margin: 0;
  font-family: var(--font-num);
  font-size: clamp(16px, 2vw, 19px);
  color: var(--gold);
  letter-spacing: .02em;
  text-align: right;
}

/* ============ 通用章节 ============ */
.page-about .about-origin,
.page-about .about-method,
.page-about .about-timeline,
.page-about .about-principles,
.page-about .about-team,
.page-about .about-eco {
  padding: clamp(44px, 6.5vw, 92px) 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-eco {
  border-bottom: 0;
}

.page-about h2 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(26px, 3.6vw, 42px);
  line-height: 1.25;
  letter-spacing: .01em;
}

.page-about h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(18px, 2.1vw, 22px);
  line-height: 1.35;
  color: var(--paper);
}

.page-about .prose p {
  margin: 0 0 16px;
  font-size: clamp(15px, 1.6vw, 16.5px);
  line-height: 1.85;
  color: var(--mist);
}

.page-about .prose p:last-child {
  margin-bottom: 0;
}

.page-about .prose a {
  color: var(--gold);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-method__lead,
.page-about .about-timeline__lead,
.page-about .about-principles__lead,
.page-about .about-team__lead {
  max-width: 62ch;
  margin: 16px 0 0;
  font-size: clamp(15px, 1.6vw, 16.5px);
  line-height: 1.85;
  color: var(--mist);
}

/* ============ 品牌起点 ============ */
.page-about .about-origin__grid > * {
  min-width: 0;
}

.page-about .about-origin__media {
  margin: 0;
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
}

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

.page-about .about-origin__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    to bottom,
    rgba(6, 10, 24, .16) 0 1px,
    transparent 1px 3px
  );
  pointer-events: none;
  opacity: .5;
}

/* ============ 坐标方法 ============ */
.page-about .method-list {
  list-style: none;
  margin: clamp(26px, 4vw, 42px) 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .method-item {
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 16px;
  padding: clamp(20px, 3vw, 30px) 0;
  border-bottom: 1px solid var(--line);
}

.page-about .method-item__num {
  font-family: var(--font-num);
  font-size: clamp(20px, 2.6vw, 26px);
  line-height: 1.1;
  color: var(--gold);
  letter-spacing: .02em;
}

.page-about .method-item__body p {
  margin: 0;
  font-size: clamp(15px, 1.6vw, 16px);
  line-height: 1.85;
  color: var(--mist);
}

/* ============ 版本演进 ============ */
.page-about .timeline {
  position: relative;
  margin-top: clamp(26px, 4vw, 42px);
  padding-left: 28px;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(to bottom, var(--gold), var(--slate) 55%, var(--ink-2));
}

.page-about .tl-node {
  position: relative;
  border-bottom: 1px solid var(--line);
}

.page-about .tl-node::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 26px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--gold);
  pointer-events: none;
}

.page-about .tl-node summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 16px;
  padding: clamp(18px, 2.6vw, 26px) 0;
}

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

.page-about .tl-node summary::marker {
  content: "";
}

.page-about .tl-node summary:hover .tl-node__title {
  color: var(--gold);
}

.page-about .tl-node__ver {
  flex: 0 0 auto;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(20px, 3vw, 26px);
  line-height: 1.2;
  color: var(--gold);
  letter-spacing: .02em;
}

.page-about .tl-node__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(16px, 1.9vw, 19px);
  line-height: 1.5;
  color: var(--paper);
  transition: color .2s ease;
}

.page-about .tl-node__body {
  padding: 0 0 clamp(18px, 2.6vw, 26px);
  max-width: 70ch;
}

.page-about .tl-node__body p {
  margin: 0;
  font-size: clamp(15px, 1.6vw, 16px);
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-timeline__media {
  margin: clamp(32px, 4.5vw, 52px) 0 0;
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  max-width: 640px;
}

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

/* ============ 服务原则 ============ */
.page-about .about-principles__grid > * {
  min-width: 0;
}

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

.page-about .principle {
  display: grid;
  grid-template-columns: 32px 1fr;
  gap: 14px;
  padding: clamp(18px, 2.4vw, 24px) 0;
  border-bottom: 1px solid var(--line);
}

.page-about .principle__idx {
  font-family: var(--font-num);
  font-size: 14px;
  line-height: 1.6;
  color: var(--gold);
  letter-spacing: .08em;
  padding-top: 3px;
}

.page-about .principle h3 {
  font-size: clamp(16px, 1.9vw, 19px);
  margin-bottom: 6px;
}

.page-about .principle p {
  margin: 0;
  font-size: clamp(14.5px, 1.5vw, 15.5px);
  line-height: 1.8;
  color: var(--mist);
}

/* ============ 团队与规模 ============ */
.page-about .stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  margin-top: clamp(26px, 4vw, 40px);
}

.page-about .stat {
  background: var(--ink);
  padding: clamp(18px, 2.6vw, 28px);
}

.page-about .stat__num {
  display: block;
  font-family: var(--font-num);
  font-size: clamp(28px, 4.4vw, 44px);
  line-height: 1;
  color: var(--gold);
  letter-spacing: .01em;
}

.page-about .stat__label {
  display: block;
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist);
  letter-spacing: .04em;
}

.page-about .about-team__media {
  margin: clamp(28px, 4vw, 44px) 0 0;
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
}

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

/* ============ 合作与生态 ============ */
.page-about .about-eco__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 48px);
}

.page-about .about-eco__grid > * {
  min-width: 0;
}

.page-about .about-eco__map {
  align-self: center;
  border: 1px solid var(--line);
  background: var(--ink-2);
  padding: clamp(16px, 2.4vw, 26px);
}

.page-about .eco-map {
  display: block;
  width: 100%;
  max-width: 640px;
  height: auto;
  margin: 0 auto;
}

.page-about .about-eco__cap {
  margin: 10px 0 0;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--slate);
  text-align: center;
  letter-spacing: .03em;
}

/* ============ 响应式 ============ */
@media (min-width: 760px) {
  .page-about .method-item {
    grid-template-columns: 82px 1fr;
    gap: 30px;
    align-items: start;
  }

  .page-about .timeline {
    padding-left: 52px;
  }

  .page-about .timeline::before {
    left: 15px;
  }

  .page-about .tl-node::before {
    left: -42px;
    top: 30px;
  }

  .page-about .tl-node__ver {
    min-width: 4.4em;
  }

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, .62fr);
    align-items: end;
  }

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

@media (max-width: 520px) {
  .page-about .tl-node__ver {
    min-width: 0;
  }

  .page-about .plate-card__list > div {
    flex-wrap: wrap;
    gap: 4px 12px;
  }

  .page-about .plate-card__list dd {
    text-align: left;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl-node__title {
    transition: none;
  }
}
<<<END>>>