.page-about {
  --about-gold: linear-gradient(180deg, rgba(216, 165, 75, 0) 0%, rgba(216, 165, 75, 0.55) 12%, rgba(216, 165, 75, 0.55) 88%, rgba(216, 165, 75, 0) 100%);
  --about-gap: clamp(60px, 9vw, 124px);
  color: var(--paper);
  font-family: var(--font-body);
  overflow-x: clip;
}

/* ---------- 面包屑 ---------- */
.page-about .crumbs {
  margin: 0 0 clamp(22px, 4vw, 36px);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--mute);
}

.page-about .crumbs a {
  color: var(--mute);
  text-decoration: none;
  transition: color 0.2s var(--ease);
}

.page-about .crumbs a:hover,
.page-about .crumbs a:focus-visible {
  color: var(--cyan);
}

.page-about .crumbs__sep {
  margin: 0 8px;
  color: var(--stone);
}

.page-about [aria-current="page"] {
  color: var(--paper);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(20px, 4vw, 40px) 0 clamp(44px, 7vw, 76px);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(32px, 6vw, 56px);
}

.page-about .about-hero__title {
  margin: clamp(14px, 2vw, 22px) 0 clamp(20px, 3vw, 30px);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(40px, 8.6vw, 96px);
  line-height: 1.03;
  letter-spacing: -0.02em;
  color: var(--paper);
  max-width: 13ch;
}

.page-about .about-hero__lead {
  margin: 0;
  font-size: clamp(16px, 1.6vw, 17px);
  line-height: 1.75;
  color: var(--paper);
  max-width: 40em;
}

.page-about .about-hero__lead--sub {
  margin-top: 16px;
  color: var(--mute);
}

.page-about .about-hero__aside {
  padding: clamp(20px, 3vw, 28px);
  background: var(--glass-1);
  border: 1px solid var(--line);
  border-top: 2px solid var(--amber);
  backdrop-filter: blur(6px);
}

.page-about .about-hero__aside-k {
  margin: 0 0 18px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--amber);
}

.page-about .about-hero__facts {
  margin: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-hero__facts > div {
  display: grid;
  grid-template-columns: 76px minmax(0, 1fr);
  gap: 12px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
}

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

.page-about .about-hero__facts dt {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--mute);
}

.page-about .about-hero__facts dd {
  margin: 0;
  font-size: 14px;
  line-height: 1.6;
  color: var(--paper);
}

/* ---------- 页内锚点 ---------- */
.page-about .about-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 20px;
  margin-top: clamp(30px, 5vw, 48px);
  padding-top: 18px;
  border-top: 1px solid var(--line);
  font-size: 13px;
}

.page-about .about-jump a {
  color: var(--mute);
  text-decoration: none;
  padding-bottom: 2px;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-jump a:hover,
.page-about .about-jump a:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

/* ---------- 通用章节 ---------- */
.page-about .about-section {
  position: relative;
  padding-top: var(--about-gap);
  padding-bottom: var(--about-gap);
  scroll-margin-top: 80px;
}

.page-about .about-section::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: min(100%, 720px);
  height: 1px;
  background: linear-gradient(90deg, var(--amber) 0%, rgba(216, 165, 75, 0.18) 46%, rgba(216, 165, 75, 0) 100%);
}

.page-about .about-section__head {
  margin-bottom: clamp(26px, 4vw, 42px);
}

.page-about .h-section {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(26px, 4.4vw, 42px);
  line-height: 1.18;
  letter-spacing: -0.01em;
  color: var(--paper);
  max-width: 20ch;
}

.page-about .about-section__intro {
  margin: 18px 0 0;
  font-size: 16px;
  line-height: 1.75;
  color: var(--mute);
  max-width: 40em;
}

.page-about .about-section__body {
  display: grid;
  gap: 20px;
}

.page-about .about-section__body p {
  margin: 0;
  font-size: 16px;
  line-height: 1.75;
  color: var(--paper);
  max-width: 40em;
}

.page-about .about-section__body a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 224, 224, 0.4);
  transition: border-color 0.2s var(--ease);
}

.page-about .about-section__body a:hover,
.page-about .about-section__body a:focus-visible {
  border-bottom-color: var(--cyan);
}

.page-about .about-quote {
  margin: clamp(28px, 4vw, 40px) 0 0;
  padding: 20px 22px;
  border-left: 4px solid var(--amber);
  background: var(--glass-1);
}

.page-about .about-quote p {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(19px, 2.6vw, 26px);
  line-height: 1.5;
  color: var(--paper);
  letter-spacing: -0.01em;
}

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

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--stone) 0%, var(--stone) 16%, var(--amber) 100%);
}

.page-about .tl-item {
  position: relative;
  padding-bottom: clamp(30px, 5vw, 52px);
  transition: opacity 0.25s var(--ease);
}

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

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 5px;
  width: 11px;
  height: 11px;
  box-sizing: border-box;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--amber);
  transition: background 0.25s var(--ease), box-shadow 0.25s var(--ease);
}

.page-about .tl-item:hover::before,
.page-about .tl-item:focus-within::before {
  background: var(--amber);
  box-shadow: 0 0 0 5px rgba(216, 165, 75, 0.16);
}

.page-about .timeline:hover .tl-item {
  opacity: 0.72;
}

.page-about .timeline:hover .tl-item:hover,
.page-about .timeline:focus-within .tl-item:focus-within {
  opacity: 1;
}

.page-about .tl-item__meta {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 10px 14px;
  margin-bottom: 8px;
}

.page-about .tl-item__ver {
  font-family: var(--font-mono);
  font-size: clamp(20px, 3.6vw, 28px);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--amber);
  line-height: 1;
}

.page-about .tl-item__stage {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--mute);
}

.page-about .tl-item__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(18px, 2.4vw, 23px);
  line-height: 1.35;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .tl-item__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--mute);
  max-width: 40em;
}

.page-about .tl-item__body a {
  color: var(--amber);
  text-decoration: none;
  border-bottom: 1px solid rgba(216, 165, 75, 0.45);
}

.page-about .tl-item__body a:hover,
.page-about .tl-item__body a:focus-visible {
  border-bottom-color: var(--amber);
}

/* ---------- 图形占位 ---------- */
.page-about .about-figure {
  margin: clamp(32px, 5vw, 56px) 0 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--line);
  background: var(--ink-2);
}

.page-about .about-figure figcaption {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--stone);
  max-width: 40em;
}

/* ---------- 团队树 ---------- */
.page-about .team-tree {
  display: grid;
  gap: 12px;
}

.page-about .team-branch {
  background: var(--glass-1);
  border: 1px solid var(--line);
  border-left: 3px solid var(--cyan);
  transition: background 0.25s var(--ease);
}

.page-about .team-tree > .team-branch:nth-child(2) {
  border-left-color: var(--moss);
}

.page-about .team-tree > .team-branch:nth-child(3) {
  border-left-color: var(--amber);
}

.page-about .team-tree > .team-branch:nth-child(4) {
  border-left-color: var(--stone);
}

.page-about .team-branch[open] {
  background: var(--glass-2);
}

.page-about .team-branch__head {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 6px 14px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
}

.page-about .team-branch__head::-webkit-details-marker {
  display: none;
}

.page-about .team-branch__head:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

.page-about .team-branch__head::after {
  content: "＋";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 15px;
  line-height: 1;
  color: var(--mute);
  transition: color 0.2s var(--ease);
}

.page-about .team-branch[open] .team-branch__head::after {
  content: "－";
  color: var(--cyan);
}

.page-about .team-branch__count {
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
  line-height: 1;
  color: var(--paper);
}

.page-about .team-branch__count small {
  margin-left: 2px;
  font-size: 12px;
  font-weight: 400;
  color: var(--mute);
}

.page-about .team-branch__name {
  font-size: 16px;
  font-weight: 600;
  color: var(--paper);
}

.page-about .team-branch__role {
  font-size: 13px;
  color: var(--mute);
}

.page-about .team-branch__body {
  padding: 0 18px 18px;
  border-top: 1px solid var(--line);
  padding-top: 14px;
}

.page-about .team-branch__body p {
  margin: 0 0 12px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--mute);
  max-width: 40em;
}

.page-about .team-branch__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 6px;
}

.page-about .team-branch__list li {
  position: relative;
  padding-left: 16px;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.7;
  color: var(--paper);
  opacity: 0.85;
}

.page-about .team-branch__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 7px;
  height: 1px;
  background: var(--stone);
}

/* ---------- 流程 ---------- */
.page-about .flow {
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .flow__step {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 16px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .flow__idx {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--cyan);
  padding-top: 4px;
}

.page-about .flow__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(17px, 2.2vw, 21px);
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .flow__text p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--mute);
  max-width: 40em;
}

/* ---------- 数据 ---------- */
.page-about .about-stats {
  display: grid;
  gap: 1px;
  margin-top: clamp(30px, 4vw, 46px);
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-stats__item {
  display: grid;
  gap: 10px;
  padding: clamp(20px, 3vw, 28px);
  background: var(--ink-2);
}

.page-about .about-stats__num {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(36px, 6vw, 56px);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--amber);
}

.page-about .about-stats__num small {
  margin-left: 6px;
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--mute);
}

.page-about .about-stats__label {
  font-size: 14px;
  line-height: 1.65;
  color: var(--mute);
  max-width: 26em;
}

/* ---------- 联系 ---------- */
.page-about .about-section--contact .about-section__head {
  margin-bottom: clamp(22px, 3vw, 32px);
}

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

.page-about .about-contact li {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 4px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-contact__k {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--mute);
}

.page-about .about-contact__v {
  font-family: var(--font-mono);
  font-size: 15px;
  line-height: 1.6;
  color: var(--paper);
  word-break: break-word;
}

.page-about .about-contact__note {
  margin: 20px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mute);
  max-width: 40em;
}

.page-about .about-cta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 18px;
  margin-top: clamp(26px, 4vw, 38px);
}

.page-about .about-totop {
  margin-left: auto;
  font-size: 13px;
  color: var(--mute);
  text-decoration: none;
  padding-bottom: 2px;
  border-bottom: 1px solid var(--line-strong);
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-totop:hover,
.page-about .about-totop:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

/* ---------- 平板及以上 ---------- */
@media (min-width: 760px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.7fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-hero__aside {
    margin-top: 8px;
  }

  .page-about .about-contact li {
    grid-template-columns: 110px minmax(0, 1fr);
    gap: 18px;
    align-items: baseline;
  }

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

@media (min-width: 900px) {
  .page-about .timeline {
    padding-left: 40px;
  }

  .page-about .timeline::before {
    left: 7px;
  }

  .page-about .tl-item {
    display: grid;
    grid-template-columns: minmax(128px, 156px) minmax(0, 1fr);
    gap: 0 clamp(24px, 3.5vw, 48px);
  }

  .page-about .tl-item::before {
    left: -40px;
    top: 6px;
  }

  .page-about .tl-item__meta {
    flex-direction: column;
    gap: 8px;
    margin-bottom: 0;
    padding-top: 2px;
  }
}

/* ---------- 桌面端 ---------- */
@media (min-width: 1180px) {
  .page-about .about-hero__title {
    max-width: 12ch;
  }

  .page-about .about-section__body {
    grid-template-columns: minmax(0, 1fr);
    max-width: 46em;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .tl-item,
  .page-about .tl-item::before,
  .page-about .team-branch,
  .page-about .about-jump a,
  .page-about .about-totop {
    transition: none;
  }
}
<<<END>>>