.page-about {
  --about-rail: 212px;
  --about-gap: clamp(32px, 6vw, 84px);
  position: relative;
  padding-bottom: clamp(56px, 9vw, 120px);
}

/* ---------- 顶部氛围光 ---------- */
.page-about::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: min(660px, 78vh);
  pointer-events: none;
  z-index: 0;
  background:
    radial-gradient(58% 96% at 80% 0%, rgba(61, 240, 138, .10), rgba(7, 11, 30, 0) 72%),
    radial-gradient(52% 86% at 8% 6%, rgba(30, 42, 94, .62), rgba(7, 11, 30, 0) 74%);
}

.page-about .about-hero,
.page-about .about-layout,
.page-about .breadcrumbs {
  position: relative;
  z-index: 1;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumbs {
  margin-top: clamp(18px, 3vw, 30px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: clamp(26px, 4.5vw, 54px);
  padding-bottom: clamp(30px, 5vw, 64px);
}

.page-about .about-hero__title {
  margin: 16px 0 0;
  max-width: min(9.5em, 100%);
  font-family: var(--font-cond);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-hero__lede {
  margin: clamp(20px, 2.6vw, 30px) 0 0;
  max-width: 60ch;
  color: var(--ice);
}

.page-about .about-hero__figure {
  margin: clamp(34px, 5vw, 62px) 0 0;
}

.page-about .about-hero__figure .figure__caption {
  margin-top: 14px;
  color: var(--ice);
  font-size: 13px;
  letter-spacing: .02em;
}

/* ---------- 左目录 / 右正文 ---------- */
.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
  align-items: start;
}

.page-about .about-toc {
  padding: 20px 22px;
  border-radius: var(--radius-lg);
  background: var(--panel);
  border: 1px solid var(--line);
}

.page-about .about-toc .toc__title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--ice);
}

.page-about .about-toc .toc__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-toc .toc__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  font-size: 14px;
  line-height: 1.6;
  color: var(--ice);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

.page-about .about-toc .toc__link:hover,
.page-about .about-toc .toc__link:focus-visible {
  color: var(--paper);
  border-bottom-color: var(--green);
}

.page-about .about-toc .toc__link[aria-current="true"] {
  color: var(--green);
  border-bottom-color: var(--green);
}

.page-about .about-toc__num {
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--green);
  opacity: .75;
}

/* ---------- 章节通用 ---------- */
.page-about .about-section {
  padding-top: clamp(46px, 6.5vw, 92px);
  scroll-margin-top: 122px;
}

.page-about .about-section:first-child {
  padding-top: 0;
}

.page-about .about-section__index {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--green);
}

.page-about .about-section__title {
  margin: 12px 0 0;
  max-width: 24ch;
  font-family: var(--font-cond);
  font-size: clamp(28px, 3.4vw, 44px);
  line-height: 1.2;
  letter-spacing: -0.012em;
  color: var(--paper);
}

.page-about .about-section__lead {
  margin: clamp(16px, 2vw, 22px) 0 0;
  max-width: 56ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--ice);
}

.page-about .about-prose {
  margin-top: clamp(20px, 2.6vw, 32px);
  max-width: 60ch;
}

.page-about .about-prose--tight {
  margin-top: clamp(22px, 3vw, 34px);
}

.page-about .about-prose p {
  margin: 0 0 1.15em;
  font-size: 16.5px;
  line-height: 1.9;
  color: var(--paper);
}

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

/* ---------- 旁注 ---------- */
.page-about .about-note {
  margin-top: clamp(26px, 3.4vw, 40px);
  max-width: 52ch;
  padding: 20px 24px;
  border-radius: var(--radius-md);
  background: var(--panel);
  border-left: 3px solid var(--green);
}

.page-about .about-note__label {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--green);
}

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

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  margin: clamp(30px, 4vw, 48px) 0 0;
  padding: 0 0 0 30px;
  list-style: none;
  border-left: 1px solid var(--line);
}

.page-about .tl-node {
  position: relative;
  padding-bottom: clamp(26px, 3.6vw, 42px);
  outline: none;
}

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

.page-about .tl-node::before {
  content: "";
  position: absolute;
  left: -36px;
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: var(--pill);
  background: var(--bg);
  border: 2px solid var(--line);
  transition: border-color .25s var(--ease), box-shadow .25s var(--ease);
}

.page-about .tl-node:hover::before,
.page-about .tl-node:focus-within::before,
.page-about .tl-node:focus-visible::before {
  border-color: var(--green);
  box-shadow: 0 0 0 5px rgba(61, 240, 138, .14);
}

.page-about .tl-node__ver {
  margin: 0;
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--green);
}

.page-about .tl-node__title {
  margin: 8px 0 0;
  font-family: var(--font-cond);
  font-size: clamp(20px, 2.2vw, 26px);
  line-height: 1.3;
  color: var(--paper);
}

.page-about .tl-node__desc {
  margin: 10px 0 0;
  max-width: 54ch;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--ice);
}

.page-about .tl-node__more {
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  margin: 0;
  max-width: 54ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ice);
  border-left: 2px solid transparent;
  padding-left: 0;
  transition: max-height .38s var(--ease), opacity .3s var(--ease),
    margin-top .3s var(--ease), padding-left .3s var(--ease), border-color .3s var(--ease);
}

.page-about .tl-node:hover .tl-node__more,
.page-about .tl-node:focus-within .tl-node__more {
  max-height: 220px;
  opacity: 1;
  margin-top: 12px;
  padding-left: 14px;
  border-left-color: var(--green);
}

@media (hover: none) {
  .page-about .tl-node__more {
    max-height: none;
    opacity: 1;
    margin-top: 12px;
    padding-left: 14px;
    border-left-color: var(--line);
  }
}

.page-about .about-timeline__figure {
  margin: clamp(34px, 4.5vw, 56px) 0 0;
}

.page-about .about-timeline__figure .figure__caption,
.page-about .about-team__figure .figure__caption {
  margin-top: 12px;
  font-size: 13px;
  color: var(--ice);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  margin-top: clamp(28px, 3.6vw, 44px);
  align-items: start;
}

.page-about .about-roles {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1px;
  background: var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.page-about .about-role {
  padding: clamp(20px, 2.6vw, 28px) clamp(20px, 2.6vw, 30px);
  background: var(--panel);
}

.page-about .about-role__name {
  margin: 0;
  font-family: var(--font-cond);
  font-size: 19px;
  letter-spacing: .01em;
  color: var(--green);
}

.page-about .about-role__text {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--paper);
}

.page-about .about-team__figure {
  margin: 0;
}

.page-about .about-team__figure .figure__media {
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--panel-2);
}

.page-about .about-team__figure .figure__img {
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 规模数字 ---------- */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(168px, 1fr));
  gap: 1px;
  margin-top: clamp(30px, 4vw, 46px);
  background: var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.page-about .about-stat {
  padding: clamp(22px, 2.8vw, 30px) clamp(20px, 2.4vw, 26px);
  background: var(--panel);
}

.page-about .about-stat__num {
  margin: 0;
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  font-size: clamp(28px, 3.2vw, 42px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-stat__unit {
  margin-left: 6px;
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--green);
}

.page-about .about-stat__label {
  margin: 14px 0 0;
  font-size: 14px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--paper);
}

.page-about .about-stat__hint {
  margin: 7px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ice);
}

/* ---------- 合作 ---------- */
.page-about .about-collab {
  margin: clamp(30px, 4vw, 46px) 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(16px, 2.2vw, 24px);
}

.page-about .about-collab__item {
  padding: clamp(22px, 2.8vw, 30px);
  border-radius: var(--radius-lg);
  background: var(--panel);
  border: 1px solid var(--line);
  transition: border-color .25s var(--ease), transform .25s var(--ease);
}

.page-about .about-collab__item:hover {
  border-color: rgba(61, 240, 138, .5);
  transform: translateY(-3px);
}

.page-about .about-collab__title {
  margin: 16px 0 0;
  font-family: var(--font-cond);
  font-size: 20px;
  line-height: 1.35;
  color: var(--paper);
}

.page-about .about-collab__text {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ice);
}

.page-about .about-callout {
  margin: clamp(24px, 3vw, 34px) 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ice);
}

.page-about .about-callout a,
.page-about .about-outro a {
  color: var(--green);
  text-decoration: none;
  border-bottom: 1px solid rgba(61, 240, 138, .45);
  transition: border-color .2s var(--ease), color .2s var(--ease);
}

.page-about .about-callout a:hover,
.page-about .about-outro a:hover {
  color: var(--paper);
  border-bottom-color: var(--paper);
}

/* ---------- 原则 ---------- */
.page-about .about-principles {
  margin: clamp(30px, 4vw, 46px) 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1px;
  background: var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.page-about .about-principle {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: clamp(18px, 3vw, 36px);
  align-items: start;
  padding: clamp(24px, 3vw, 34px);
  background: var(--panel);
}

.page-about .about-principle__num {
  font-size: clamp(28px, 3vw, 38px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--green);
}

.page-about .about-principle__title {
  margin: 0;
  font-family: var(--font-cond);
  font-size: clamp(20px, 2.2vw, 25px);
  letter-spacing: .02em;
  color: var(--paper);
}

.page-about .about-principle__text {
  margin: 10px 0 0;
  max-width: 56ch;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--ice);
}

/* ---------- 收尾 ---------- */
.page-about .about-outro {
  margin-top: clamp(30px, 4vw, 48px);
  padding: clamp(24px, 3vw, 34px);
  border-radius: var(--radius-lg);
  background: linear-gradient(118deg, var(--panel-2) 0%, var(--panel) 62%);
  border: 1px solid var(--line);
}

.page-about .about-outro p {
  margin: 0;
  max-width: 58ch;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--paper);
}

.page-about .about-outro__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

/* ---------- 桌面 ---------- */
@media (min-width: 768px) {
  .page-about .about-collab {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 1000px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
  }

  .page-about .about-toc {
    position: sticky;
    top: 118px;
    padding: 22px 20px;
  }

  .page-about .about-toc .toc__list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 2px;
  }

  .page-about .about-toc .toc__link {
    display: flex;
    padding: 7px 0;
    border-bottom: 1px solid transparent;
  }
}

@media (min-width: 1180px) {
  .page-about .about-section__title {
    max-width: 22ch;
  }
}

/* ---------- 窄屏 ---------- */
@media (max-width: 620px) {
  .page-about .about-hero__lede,
  .page-about .about-prose p,
  .page-about .about-section__lead {
    font-size: 15.5px;
  }

  .page-about .about-timeline {
    padding-left: 22px;
  }

  .page-about .tl-node::before {
    left: -28px;
  }

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

  .page-about .about-principle {
    grid-template-columns: minmax(0, 1fr);
    gap: 12px;
  }

  .page-about .about-outro__actions .btn {
    width: 100%;
    text-align: center;
  }
}
<<<END>>>