.page-about {
  --about-aside: 176px;
  --about-cut: 20px;
  background: var(--ink);
  color: var(--paper);
  overflow-x: hidden;
}

.page-about .crumbs {
  padding-top: clamp(20px, 3vw, 36px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  padding: clamp(24px, 4vw, 56px) 0 clamp(44px, 6vw, 88px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    linear-gradient(118deg, rgba(10, 42, 34, 0) 46%, rgba(10, 42, 34, 0.85) 46.2%, rgba(4, 26, 21, 0) 46.6%),
    repeating-linear-gradient(118deg, transparent 0 26px, rgba(30, 90, 76, 0.28) 26px 27px);
  opacity: 0.85;
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 48px);
  align-items: start;
}

.page-about .about-hero__kicker {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-hero__title {
  margin: 0;
  max-width: 16ch;
  color: var(--white);
  line-height: 1.12;
}

.page-about .about-hero__lead-text {
  margin: clamp(18px, 2.4vw, 26px) 0 0;
  max-width: 52ch;
  color: var(--mist-soft);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 32px);
}

.page-about .about-hero__panel {
  position: relative;
  padding: clamp(20px, 3vw, 30px);
  background: linear-gradient(152deg, var(--ink-card), var(--ink-panel));
  border: 1px solid var(--line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-cut)), calc(100% - var(--about-cut)) 100%, 0 100%);
}

.page-about .about-hero__panel-title {
  margin: 0 0 18px;
  font-size: 12px;
  letter-spacing: 0.24em;
  color: var(--mist);
}

.page-about .stat-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 16px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .stat-grid__item {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding-top: 10px;
  border-top: 1px solid var(--line);
}

.page-about .stat-grid__num {
  font-family: var(--font-data);
  font-size: clamp(26px, 4vw, 38px);
  line-height: 1;
  color: var(--gold);
}

.page-about .stat-grid__unit {
  font-size: 0.5em;
  margin-left: 2px;
  color: var(--gold);
}

.page-about .stat-grid__label {
  font-size: 13px;
  color: var(--mist);
}

.page-about .about-hero__panel-note {
  margin: 20px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-chapter {
  padding: clamp(36px, 5.5vw, 76px) 0;
  border-top: 1px solid rgba(30, 90, 76, 0.5);
}

.page-about .about-chapter__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(16px, 2.4vw, 32px);
}

.page-about .about-chapter__aside {
  display: flex;
  align-items: center;
  gap: 14px;
}

.page-about .about-num {
  font-size: clamp(24px, 3vw, 34px);
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-anno {
  font-size: 12px;
  letter-spacing: 0.24em;
  color: var(--mist);
}

.page-about .about-chapter__body > .h-sec {
  margin: 0 0 clamp(16px, 2vw, 24px);
  color: var(--white);
}

.page-about .about-chapter__body .body-text {
  margin: 0 0 16px;
  max-width: var(--read);
  color: var(--mist-soft);
}

.page-about .about-chapter__body .body-text:last-child {
  margin-bottom: 0;
}

/* ---------- 要点列表 ---------- */
.page-about .about-points {
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
  max-width: var(--read);
}

.page-about .about-points li {
  display: grid;
  grid-template-columns: 28px minmax(0, 1fr);
  gap: 4px;
  padding: 12px 16px;
  background: rgba(10, 42, 34, 0.7);
  border-left: 2px solid var(--line);
  font-size: 15px;
  line-height: 1.7;
  color: var(--mist-soft);
}

.page-about .about-points .mono {
  color: var(--cyan);
  font-size: 13px;
  letter-spacing: 0.1em;
}

/* ---------- 团队数据条 ---------- */
.page-about .team-list {
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.page-about .team-bar {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr);
  align-items: baseline;
  gap: 4px 14px;
  padding: 14px 18px 14px 20px;
  background: var(--ink-panel);
  border: 1px solid var(--line);
  border-left: 3px solid var(--line);
  outline: none;
  transition: border-color var(--t) var(--ease), background var(--t) var(--ease), transform var(--t) var(--ease);
}

.page-about .team-bar:hover,
.page-about .team-bar:focus-visible {
  border-color: var(--cyan);
  border-left-color: var(--gold);
  background: var(--ink-card);
  transform: translateX(2px);
}

.page-about .team-bar:focus-visible {
  box-shadow: 0 0 0 2px var(--cyan), 0 0 0 4px var(--ink);
}

.page-about .team-bar__num {
  font-size: 26px;
  line-height: 1;
  color: var(--gold);
}

.page-about .team-bar__role {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--white);
}

.page-about .team-bar__note {
  grid-column: 1 / -1;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist);
  overflow: hidden;
  transition: max-height var(--t) var(--ease), opacity var(--t) var(--ease), margin-top var(--t) var(--ease);
  opacity: 1;
}

/* ---------- 流程图 ---------- */
.page-about .flow-list {
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
  max-width: 860px;
}

.page-about .flow-step {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 14px;
  padding: 16px 18px;
  background: linear-gradient(100deg, rgba(16, 56, 46, 0.9), rgba(10, 42, 34, 0.6));
  border: 1px solid var(--line);
  clip-path: polygon(var(--about-cut) 0, 100% 0, 100% 100%, 0 100%, 0 var(--about-cut));
}

.page-about .flow-step__idx {
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--cyan);
  padding-top: 4px;
}

.page-about .flow-step .h-sub {
  margin: 0 0 6px;
  color: var(--white);
}

.page-about .flow-step p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: clamp(24px, 3vw, 36px) 0 0;
  border: 1px solid var(--line);
  background: var(--ink-panel);
  overflow: hidden;
}

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

.page-about .about-figure figcaption {
  padding: 12px 16px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .about-figure--track {
  max-width: 720px;
}

/* ---------- 版本时间线 ---------- */
.page-about .ver-list {
  position: relative;
  margin: clamp(24px, 3vw, 34px) 0 0;
  padding: 0 0 0 26px;
  list-style: none;
  display: grid;
  gap: 12px;
  max-width: 820px;
}

.page-about .ver-list::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan), var(--line) 55%, rgba(30, 90, 76, 0.2));
}

.page-about .ver-node {
  position: relative;
}

.page-about .ver-node::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 20px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--line);
  transition: border-color var(--t) var(--ease), background var(--t) var(--ease);
}

.page-about .ver-node--current::before {
  border-color: var(--cyan);
  background: var(--cyan);
}

.page-about .ver-node__card {
  padding: 16px 18px;
  background: var(--ink-card);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%);
  outline: none;
  transition: border-color var(--t) var(--ease), background var(--t) var(--ease), transform var(--t) var(--ease);
}

.page-about .ver-node__card:hover,
.page-about .ver-node__card:focus-visible {
  border-color: var(--cyan);
  transform: translateY(-2px);
}

.page-about .ver-node__card:focus-visible {
  box-shadow: 0 0 0 2px var(--cyan);
}

.page-about .ver-node__head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}

.page-about .ver-node__ver {
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--gold);
  padding: 2px 8px;
  border: 1px solid rgba(255, 180, 60, 0.4);
}

.page-about .ver-node__title {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.03em;
  color: var(--white);
}

.page-about .ver-node__body {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
  overflow: hidden;
  transition: max-height var(--t) var(--ease), opacity var(--t) var(--ease), margin-top var(--t) var(--ease);
  opacity: 1;
}

/* ---------- 覆盖 ---------- */
.page-about .cover-projects {
  margin: clamp(20px, 2.6vw, 28px) 0 0;
}

.page-about .cover-projects__label {
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: 0.24em;
  color: var(--mist);
}

.page-about .tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .geo-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(148px, 1fr));
  gap: 10px;
  margin: clamp(20px, 2.6vw, 28px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .geo-item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 14px 14px 14px 16px;
  background: rgba(10, 42, 34, 0.8);
  border-left: 2px solid var(--violet);
  transition: border-color var(--t) var(--ease), background var(--t) var(--ease);
}

.page-about .geo-item:hover {
  border-left-color: var(--cyan);
  background: var(--ink-card);
}

.page-about .geo-item__num {
  font-size: 24px;
  line-height: 1;
  color: var(--paper);
}

.page-about .geo-item__label {
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist);
}

/* ---------- 合作 ---------- */
.page-about .partner-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin-top: clamp(22px, 3vw, 30px);
}

.page-about .partner-card {
  padding: 18px 20px;
  background: var(--ink-panel);
  border: 1px solid var(--line);
  border-top: 2px solid var(--line);
  transition: border-color var(--t) var(--ease), transform var(--t) var(--ease);
}

.page-about .partner-card:hover {
  border-top-color: var(--cyan);
  transform: translateY(-2px);
}

.page-about .partner-card__num {
  display: block;
  font-size: 30px;
  line-height: 1;
  color: var(--gold);
  margin-bottom: 10px;
}

.page-about .partner-card .h-sub {
  margin: 0 0 8px;
  color: var(--white);
}

.page-about .partner-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 结尾引导 ---------- */
.page-about .about-cta {
  padding: clamp(36px, 5vw, 68px) 0 clamp(48px, 7vw, 96px);
  border-top: 1px solid var(--line);
  background: linear-gradient(180deg, var(--ink) 0%, var(--ink-deep) 100%);
}

.page-about .about-cta__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 36px);
  align-items: end;
}

.page-about .about-cta__text .h-sec {
  margin: 0 0 12px;
  color: var(--white);
}

.page-about .about-cta__text .body-text {
  margin: 0;
  max-width: 46ch;
  color: var(--mist);
}

.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 28px;
  margin: 0;
  padding: 0;
  list-style: none;
}

/* ---------- 断点 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: end;
  }

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

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
  }
}

@media (min-width: 900px) {
  .page-about .about-chapter__grid {
    grid-template-columns: var(--about-aside) minmax(0, 1fr);
    gap: clamp(24px, 4vw, 68px);
  }

  .page-about .about-chapter__aside {
    position: sticky;
    top: 96px;
    align-self: start;
    flex-direction: column;
    align-items: flex-start;
    gap: 18px;
    padding-top: 6px;
  }

  .page-about .about-anno {
    writing-mode: vertical-rl;
    letter-spacing: 0.32em;
    font-size: 12px;
  }

  /* 团队说明在桌面端默认收起，悬停或键盘聚焦时展开 */
  .page-about .team-bar__note {
    max-height: 0;
    opacity: 0;
    margin-top: 0;
  }

  .page-about .team-bar:hover .team-bar__note,
  .page-about .team-bar:focus-visible .team-bar__note,
  .page-about .team-bar:focus-within .team-bar__note {
    max-height: 160px;
    opacity: 1;
    margin-top: 10px;
  }

  /* 版本说明在桌面端默认收起 */
  .page-about .ver-node__body {
    max-height: 0;
    opacity: 0;
    margin-top: 0;
  }

  .page-about .ver-node__card:hover .ver-node__body,
  .page-about .ver-node__card:focus-visible .ver-node__body,
  .page-about .ver-node__card:focus-within .ver-node__body {
    max-height: 200px;
    opacity: 1;
    margin-top: 10px;
  }
}

@media (max-width: 520px) {
  .page-about .about-hero__title {
    max-width: none;
  }

  .page-about .team-bar {
    grid-template-columns: 44px minmax(0, 1fr);
  }

  .page-about .flow-step {
    grid-template-columns: 34px minmax(0, 1fr);
    gap: 10px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .team-bar,
  .page-about .team-bar__note,
  .page-about .ver-node__card,
  .page-about .ver-node__body,
  .page-about .geo-item,
  .page-about .partner-card {
    transition: none;
  }

  .page-about .team-bar:hover,
  .page-about .team-bar:focus-visible,
  .page-about .ver-node__card:hover,
  .page-about .ver-node__card:focus-visible,
  .page-about .partner-card:hover {
    transform: none;
  }
}
<<<END>>>