.page-about {
  padding-bottom: 96px;
  overflow-x: clip;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  padding-top: 28px;
  font-size: 13px;
  color: var(--mist);
}
.page-about .breadcrumbs a {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur-hover) var(--ease), border-color var(--dur-hover) var(--ease);
}
.page-about .breadcrumbs a:hover {
  color: var(--jade);
  border-bottom-color: var(--jade-deep);
}
.page-about .breadcrumbs__sep {
  color: var(--mist);
  opacity: .5;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: 38px 0 46px;
  border-bottom: 1px solid var(--line);
}
.page-about .eyebrow {
  margin: 0 0 20px;
  font-family: var(--font-sans);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--jade);
}
.page-about .page-title {
  margin: 0;
  max-width: 15em;
  font-family: var(--font-display);
  font-size: clamp(34px, 6.4vw, 74px);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -.01em;
  color: var(--ivory);
}
.page-about .page-title em {
  font-style: normal;
  color: var(--jade);
  background: linear-gradient(transparent 64%, rgba(47, 191, 143, .16) 64%);
  padding: 0 .06em;
}
.page-about .page-lede {
  margin: 26px 0 0;
  max-width: 44em;
  font-size: 17px;
  line-height: 1.8;
  color: var(--ivory-soft);
}

/* ---------- 数据条 ---------- */
.page-about .stat-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 36px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--r-m);
  overflow: hidden;
}
.page-about .stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 20px;
  background: var(--felt);
}
.page-about .stat__num {
  font-family: var(--font-mono);
  font-size: 25px;
  font-weight: 600;
  letter-spacing: -.02em;
  color: var(--gold);
}
.page-about .stat__label {
  font-size: 12.5px;
  letter-spacing: .04em;
  color: var(--mist);
}

/* ---------- 双栏骨架 ---------- */
.page-about .about-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 44px;
  margin-top: 54px;
}
.page-about .about-main {
  min-width: 0;
}
.page-about .about-rail {
  display: grid;
  gap: 22px;
  min-width: 0;
}

/* ---------- 章节 ---------- */
.page-about .chapter {
  padding-top: 52px;
  margin-top: 52px;
  border-top: 1px solid var(--line);
  overflow-wrap: break-word;
}
.page-about .chapter:first-child {
  padding-top: 0;
  margin-top: 0;
  border-top: 0;
}
.page-about .chapter__head {
  display: flex;
  align-items: baseline;
  gap: 15px;
  margin-bottom: 22px;
}
.page-about .chapter__mark {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  border-radius: var(--r-s);
  background: var(--jade);
  color: var(--ink);
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 700;
  line-height: 1;
  box-shadow: inset 0 -2px 0 rgba(0, 0, 0, .18);
}
.page-about .chapter__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(23px, 3.4vw, 34px);
  font-weight: 700;
  line-height: 1.26;
  letter-spacing: -.01em;
  color: var(--ivory);
}
.page-about .chapter__more {
  margin: 24px 0 0;
}
.page-about .link-more {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 600;
  color: var(--jade);
  text-decoration: none;
  padding: 8px 0;
  border-bottom: 1px solid var(--jade-deep);
  transition: color var(--dur-hover) var(--ease), border-color var(--dur-hover) var(--ease);
}
.page-about .link-more:hover {
  color: var(--gold);
  border-bottom-color: var(--gold);
}
.page-about .link-more::after {
  content: " →";
  font-family: var(--font-mono);
}

/* ---------- 正文 ---------- */
.page-about .prose p {
  margin: 0 0 18px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ivory-soft);
}
.page-about .prose p:last-child {
  margin-bottom: 0;
}
.page-about .prose a {
  color: var(--jade);
  text-decoration: none;
  border-bottom: 1px solid var(--jade-deep);
  transition: color var(--dur-hover) var(--ease), border-color var(--dur-hover) var(--ease);
}
.page-about .prose a:hover {
  color: var(--gold);
  border-bottom-color: var(--gold);
}

/* ---------- 图形 ---------- */
.page-about .figure {
  margin: 0 0 24px;
}
.page-about .figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--r-m);
  border: 1px solid var(--line);
}
.page-about .figure--wide img {
  aspect-ratio: 16 / 7;
}
.page-about .figure--square img {
  aspect-ratio: 1 / 1;
}

/* ---------- 三条内容线 ---------- */
.page-about .line-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  margin-top: 28px;
}
.page-about .line-card {
  position: relative;
  padding: 22px 20px 24px;
  border: 1px solid var(--line);
  border-radius: var(--r-m);
  background: var(--felt);
  transition: transform var(--dur-hover) var(--ease), border-color var(--dur-hover) var(--ease);
}
.page-about .line-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 20px;
  right: 20px;
  height: 2px;
  border-radius: 0 0 2px 2px;
  background: var(--jade);
}
.page-about .line-card--gold::before {
  background: var(--gold);
}
.page-about .line-card--red::before {
  background: var(--dice);
}
.page-about .line-card:hover {
  transform: translateY(-2px);
  border-color: var(--jade-deep);
}
.page-about .line-card__tag {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .12em;
  color: var(--mist);
}
.page-about .line-card__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  line-height: 1.35;
  color: var(--ivory);
}
.page-about .line-card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--ivory-soft);
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  margin-top: 24px;
}
.page-about .team-card {
  padding: 22px 20px 24px;
  border: 1px solid var(--line);
  border-radius: var(--r-m);
  background:
    linear-gradient(180deg, rgba(16, 36, 29, .95), rgba(12, 23, 20, .95));
  transition: border-color var(--dur-hover) var(--ease);
}
.page-about .team-card:hover {
  border-color: var(--jade-deep);
}
.page-about .team-card__sig {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  margin-bottom: 14px;
  border: 1px solid var(--jade-deep);
  border-radius: var(--r-s);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--jade);
}
.page-about .team-card__title {
  margin: 0 0 10px;
  font-family: var(--font-sans);
  font-size: 17px;
  font-weight: 600;
  color: var(--ivory);
}
.page-about .team-card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--ivory-soft);
}

/* ---------- 等宽数据行 ---------- */
.page-about .data-line {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 14px;
  margin: 30px 0 0;
  padding: 13px 16px;
  border-left: 2px solid var(--jade);
  border-radius: 0 var(--r-s) var(--r-s) 0;
  background: linear-gradient(90deg, rgba(47, 191, 143, .08), rgba(47, 191, 143, 0) 72%);
  font-family: var(--font-mono);
  font-size: 13.5px;
  color: var(--ivory);
  transition: border-color var(--dur-hover) var(--ease);
}
.page-about .data-line:hover {
  border-left-color: var(--gold);
}
.page-about .data-line__val {
  font-weight: 600;
  color: var(--gold);
}
.page-about .data-line__src {
  font-size: 12.5px;
  color: var(--mist);
}

/* ---------- 阶段时间轴 ---------- */
.page-about .milestones {
  margin-top: 24px;
  padding: 26px 22px 22px;
  border: 1px solid var(--line);
  border-radius: var(--r-m);
  background: var(--felt);
}
.page-about .ms {
  position: relative;
  padding: 0 0 22px 30px;
}
.page-about .ms:last-child {
  padding-bottom: 0;
}
.page-about .ms::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 14px;
  bottom: -4px;
  width: 1px;
  background: var(--mist);
  opacity: .45;
}
.page-about .ms:last-child::before {
  display: none;
}
.page-about .ms__dot {
  position: absolute;
  left: 0;
  top: 5px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 3px rgba(232, 180, 74, .16);
}
.page-about .ms__label {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .14em;
  color: var(--gold);
}
.page-about .ms__title {
  margin: 0 0 6px;
  font-family: var(--font-sans);
  font-size: 16.5px;
  font-weight: 600;
  color: var(--ivory);
}
.page-about .ms__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--ivory-soft);
}

/* ---------- 合作生态 ---------- */
.page-about .eco {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
  align-items: start;
}
.page-about .eco .figure {
  margin-bottom: 0;
}
.page-about .eco-list {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 16px;
}
.page-about .eco-list li {
  padding-left: 16px;
  border-left: 2px solid var(--line);
  transition: border-color var(--dur-hover) var(--ease);
}
.page-about .eco-list li:hover {
  border-left-color: var(--jade-deep);
}
.page-about .eco-list strong {
  display: block;
  margin-bottom: 4px;
  font-size: 15px;
  font-weight: 600;
  color: var(--ivory);
}
.page-about .eco-list span {
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--ivory-soft);
}

/* ---------- 会员层级 ---------- */
.page-about .tiers {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
}
.page-about .tier {
  padding: 7px 15px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--felt);
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--ivory-soft);
}
.page-about .tier--gold {
  border-color: var(--gold);
  color: var(--gold);
}
.page-about .tier--jade {
  border-color: var(--jade);
  color: var(--jade);
}

/* ---------- 联系通道 ---------- */
.page-about .channels {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: 24px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--r-m);
  overflow: hidden;
}
.page-about .channel {
  padding: 20px;
  background: var(--felt);
  box-shadow: inset 0 -2px 0 transparent;
  transition: box-shadow var(--dur-hover) var(--ease);
}
.page-about .channel:hover {
  box-shadow: inset 0 -2px 0 var(--jade);
}
.page-about .channel__k {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .14em;
  color: var(--jade);
}
.page-about .channel__t {
  margin: 0 0 8px;
  font-family: var(--font-sans);
  font-size: 16px;
  font-weight: 600;
  color: var(--ivory);
}
.page-about .channel__d {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--ivory-soft);
}
.page-about .channel__v {
  display: block;
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 13.5px;
  color: var(--gold);
  word-break: break-all;
}
.page-about .channel__go {
  display: inline-block;
  margin-top: 12px;
  font-size: 14px;
  font-weight: 600;
  color: var(--jade);
  text-decoration: none;
  border-bottom: 1px solid var(--jade-deep);
  transition: color var(--dur-hover) var(--ease), border-color var(--dur-hover) var(--ease);
}
.page-about .channel__go:hover {
  color: var(--gold);
  border-bottom-color: var(--gold);
}

/* ---------- 右侧栏 ---------- */
.page-about .rail-block {
  padding: 20px 20px 22px;
  border: 1px solid var(--line);
  border-radius: var(--r-m);
  background: var(--felt);
}
.page-about .rail-block__title {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--mist);
}
.page-about .rail-tl {
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about .rail-tl__item {
  position: relative;
  padding: 0 0 18px 22px;
}
.page-about .rail-tl__item:last-child {
  padding-bottom: 0;
}
.page-about .rail-tl__item::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 14px;
  bottom: -2px;
  width: 1px;
  background: var(--mist);
  opacity: .4;
}
.page-about .rail-tl__item:last-child::before {
  display: none;
}
.page-about .rail-tl__dot {
  position: absolute;
  left: 0;
  top: 5px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--gold);
  transition: transform var(--dur-hover) var(--ease), box-shadow var(--dur-hover) var(--ease);
}
.page-about .rail-tl__item:hover .rail-tl__dot {
  transform: scale(1.35);
  box-shadow: 0 0 0 4px rgba(232, 180, 74, .2);
}
.page-about .rail-tl__label {
  display: block;
  margin-bottom: 4px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--mist);
}
.page-about .rail-tl__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.62;
  color: var(--ivory);
}
.page-about .rail-tl__note {
  margin: 6px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
  overflow: hidden;
  transition: max-height var(--dur-switch) var(--ease), opacity var(--dur-switch) var(--ease);
}

.page-about .rail-nums {
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about .rail-nums li {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 11px 0 11px 12px;
  border-top: 1px solid var(--line);
  border-left: 2px solid transparent;
  transition: border-color var(--dur-hover) var(--ease);
}
.page-about .rail-nums li:first-child {
  border-top: 0;
}
.page-about .rail-nums li:hover {
  border-left-color: var(--jade);
}
.page-about .rail-nums__n {
  flex: 0 0 auto;
  min-width: 3.4em;
  font-family: var(--font-mono);
  font-size: 19px;
  font-weight: 600;
  letter-spacing: -.01em;
  color: var(--gold);
}
.page-about .rail-nums__t {
  font-size: 13px;
  line-height: 1.5;
  color: var(--ivory-soft);
}
.page-about .aside-note {
  margin: 0;
  padding-left: 14px;
  border-left: 2px solid var(--line);
  font-size: 13px;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 窄屏以上 ---------- */
@media (min-width: 640px) {
  .page-about .stat-row {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .line-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .channels {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 720px) {
  .page-about .team-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .eco {
    grid-template-columns: 220px minmax(0, 1fr);
    gap: 30px;
  }
}

@media (min-width: 780px) {
  .page-about .figure--tile {
    float: right;
    width: 38%;
    margin: 6px 0 18px 30px;
  }
  .page-about .chapter::after {
    content: "";
    display: table;
    clear: both;
  }
}

@media (min-width: 1000px) {
  .page-about .about-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 72px;
    align-items: start;
  }
  .page-about .about-rail {
    position: sticky;
    top: 96px;
  }
}

@media (hover: hover) {
  .page-about .rail-tl__note {
    max-height: 0;
    opacity: 0;
  }
  .page-about .rail-tl__item:hover .rail-tl__note {
    max-height: 7em;
    opacity: 1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .line-card,
  .page-about .rail-tl__dot,
  .page-about .rail-tl__note,
  .page-about .breadcrumbs a,
  .page-about .prose a,
  .page-about .link-more,
  .page-about .channel__go,
  .page-about .data-line,
  .page-about .eco-list li,
  .page-about .rail-nums li,
  .page-about .channel {
    transition: none;
  }
  .page-about .line-card:hover,
  .page-about .rail-tl__item:hover .rail-tl__dot {
    transform: none;
  }
}
<<<END>>>