.page-about {
  --abt-red: var(--maple-red);
  --abt-red-lt: var(--maple-red-light);
  --abt-green: var(--aurora-green);
  --abt-green-deep: var(--aurora-deep);
  --abt-rule: 1px solid var(--blueprint-line);
  background: var(--midnight-900);
  color: var(--silver);
  font-family: var(--font-body);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

.page-about .about-crumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--silver-dim);
  margin: 0 0 18px;
  letter-spacing: .04em;
}

.page-about .about-crumb a {
  color: var(--abt-red-lt);
  text-decoration: none;
}

.page-about .about-crumb a:hover,
.page-about .about-crumb a:focus-visible {
  color: var(--abt-red);
  text-decoration: underline;
}

.page-about .about-crumb__sep {
  color: var(--blueprint-line);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding: clamp(40px, 8vw, 104px) 0 clamp(38px, 6vw, 76px);
  border-bottom: var(--abt-rule);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -34%;
  right: -14%;
  width: min(760px, 92vw);
  height: min(760px, 92vw);
  background:
    radial-gradient(circle at 32% 34%, rgba(61, 224, 168, .17), transparent 62%),
    radial-gradient(circle at 68% 62%, rgba(228, 50, 43, .15), transparent 60%);
  filter: blur(8px);
  pointer-events: none;
  animation: about-aurora 24s var(--ease) infinite alternate;
}

@keyframes about-aurora {
  0% { transform: translate3d(0, 0, 0); opacity: .78; }
  100% { transform: translate3d(-42px, 30px, 0); opacity: .96; }
}

.page-about .about-hero__grid {
  position: relative;
  display: grid;
  gap: 40px;
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 5.4vw, 44px);
  line-height: 1.2;
  letter-spacing: .02em;
  color: var(--paper);
  margin: 0 0 22px;
  max-width: 16em;
}

.page-about .about-hero__hl {
  color: var(--abt-red-lt);
  background-image: linear-gradient(transparent 68%, rgba(228, 50, 43, .28) 68%);
  background-repeat: no-repeat;
  background-size: 100% 100%;
}

.page-about .about-hero__lede {
  color: var(--silver);
  max-width: 36em;
  margin: 0 0 30px;
  font-size: 16px;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-hero__side {
  border-left: 2px solid var(--abt-green-deep);
  padding-left: 22px;
}

.page-about .about-hero__standfirst {
  font-family: var(--font-serif);
  font-size: clamp(17px, 2.2vw, 21px);
  line-height: 1.7;
  color: var(--paper);
  margin: 0 0 26px;
}

.page-about .about-hero__meta {
  margin: 0;
  padding: 0;
}

.page-about .about-hero__meta-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 11px 0;
  border-bottom: var(--abt-rule);
}

.page-about .about-hero__meta-row:first-child {
  border-top: var(--abt-rule);
}

.page-about .about-hero__meta-row dt {
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--silver-dim);
  margin: 0;
}

.page-about .about-hero__meta-row dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 700;
  color: var(--abt-green);
}

/* ---------- 主体骨架 ---------- */

.page-about .about-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  padding: clamp(34px, 6vw, 72px) 0 clamp(48px, 8vw, 96px);
}

.page-about .about-toc {
  display: none;
}

.page-about .about-toc__head {
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--silver-dim);
  margin: 0 0 14px;
  padding-bottom: 12px;
  border-bottom: var(--abt-rule);
}

.page-about .about-toc__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.page-about .about-toc__list a {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 8px 10px 8px 12px;
  border-left: 2px solid transparent;
  color: var(--silver-dim);
  font-size: 14px;
  line-height: 1.5;
  text-decoration: none;
  transition: color .2s var(--ease), border-color .2s var(--ease), background-color .2s var(--ease);
}

.page-about .about-toc__list a span {
  font-size: 12px;
  color: var(--blueprint-line);
  transition: color .2s var(--ease);
}

.page-about .about-toc__list a:hover,
.page-about .about-toc__list a:focus-visible {
  color: var(--paper);
  border-left-color: var(--abt-red);
  background: rgba(30, 42, 74, .55);
  outline: none;
}

.page-about .about-toc__list a:hover span,
.page-about .about-toc__list a:focus-visible span {
  color: var(--abt-red-lt);
}

.page-about .about-toc__note {
  margin: 20px 0 0;
  padding-top: 14px;
  border-top: var(--abt-rule);
  font-size: 13px;
  line-height: 1.65;
  color: var(--silver-dim);
}

/* ---------- 章节 ---------- */

.page-about .about-flow {
  counter-reset: about-chap;
  min-width: 0;
}

.page-about .about-chapter {
  counter-increment: about-chap;
  padding-top: clamp(34px, 5vw, 58px);
  margin-top: clamp(34px, 5vw, 58px);
  border-top: var(--abt-rule);
  scroll-margin-top: calc(var(--topbar-h) + 28px);
}

.page-about .about-chapter__head {
  margin-bottom: 26px;
}

.page-about .about-chapter__code {
  margin: 0 0 10px;
  font-size: 13px;
  letter-spacing: .18em;
  color: var(--abt-green);
}

.page-about .about-chapter__code::before {
  content: "CH / " counter(about-chap, decimal-leading-zero);
}

.page-about .about-chapter__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(22px, 3.4vw, 28px);
  line-height: 1.3;
  letter-spacing: .02em;
  color: var(--paper);
  margin: 0 0 12px;
}

.page-about .about-chapter__desc {
  margin: 0;
  max-width: 40em;
  font-size: 16px;
  color: var(--silver-dim);
}

.page-about .about-chapter p {
  max-width: 40em;
}

/* ---------- 图片 ---------- */

.page-about .about-figure {
  margin: 0 0 30px;
}

.page-about .about-figure--band {
  margin-bottom: 34px;
}

.page-about .img-frame {
  border: var(--abt-rule);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--midnight-700);
}

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

.page-about .img-frame__caption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--silver-dim);
}

/* ---------- 团队卡片 ---------- */

.page-about .about-cards {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  margin-top: 4px;
}

.page-about .about-role {
  padding: 22px 20px 24px;
  background: var(--midnight-700);
  border: var(--abt-rule);
  border-top-width: 2px;
  border-radius: var(--radius);
}

.page-about .about-role--red { border-top-color: var(--abt-red); }
.page-about .about-role--green { border-top-color: var(--abt-green); }
.page-about .about-role--silver { border-top-color: var(--silver-dim); }

.page-about .about-role__code {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--silver-dim);
}

.page-about .about-role--red .about-role__code { color: var(--abt-red-lt); }
.page-about .about-role--green .about-role__code { color: var(--abt-green); }

.page-about .about-role__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 18px;
  letter-spacing: .02em;
  color: var(--paper);
  margin: 0 0 10px;
}

.page-about .about-role p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--silver-dim);
}

.page-about .about-role__title + p {
  color: var(--silver);
}

/* ---------- 分区编号说明 ---------- */

.page-about .about-zones {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .about-zone {
  padding: 20px 18px 22px;
  border: var(--abt-rule);
  border-left-width: 3px;
  border-radius: var(--radius);
  background: rgba(14, 22, 48, .6);
}

.page-about .about-zone--red { border-left-color: var(--abt-red); }
.page-about .about-zone--green { border-left-color: var(--abt-green); }
.page-about .about-zone--silver { border-left-color: var(--silver-dim); }

.page-about .about-zone--paper {
  background: var(--paper);
  border-left-color: var(--aurora-deep);
  border-color: rgba(30, 42, 74, .18);
}

.page-about .about-zone__code {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--silver-dim);
}

.page-about .about-zone--red .about-zone__code { color: var(--abt-red-lt); }
.page-about .about-zone--green .about-zone__code { color: var(--abt-green); }
.page-about .about-zone--paper .about-zone__code { color: var(--aurora-deep); }

.page-about .about-zone__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 17px;
  letter-spacing: .02em;
  color: var(--paper);
  margin: 0 0 10px;
}

.page-about .about-zone--paper .about-zone__title {
  color: var(--ink);
}

.page-about .about-zone p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--silver-dim);
}

.page-about .about-zone--paper p {
  color: #3A4457;
}

.page-about .about-zone__title + p {
  color: var(--silver);
}

.page-about .about-zone--paper .about-zone__title + p {
  color: #2C3446;
}

/* ---------- 颜色锚点说明块 ---------- */

.page-about .about-anchor {
  margin-top: 26px;
  padding: 22px 20px 20px;
  border-left: 3px solid var(--abt-green);
  background: rgba(28, 127, 99, .09);
  border-radius: var(--radius);
}

.page-about .about-anchor__lead {
  margin: 0 0 14px;
  font-family: var(--font-serif);
  font-size: 17px;
  color: var(--paper);
  max-width: none;
}

.page-about .about-anchor__list {
  list-style: none;
  margin: 0 0 16px;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-about .about-anchor__list li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--silver);
}

.page-about .about-anchor__list strong {
  color: var(--paper);
}

.page-about .about-dot {
  flex: none;
  width: 10px;
  height: 10px;
  margin-top: 8px;
  border-radius: 50%;
}

.page-about .about-dot--red { background: var(--abt-red); }
.page-about .about-dot--green { background: var(--abt-green); }

.page-about .about-anchor p:last-child {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--silver-dim);
  max-width: 42em;
}

/* ---------- 时间线 ---------- */

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-timeline > li {
  border-top: var(--abt-rule);
}

.page-about .about-timeline > li:last-child {
  border-bottom: var(--abt-rule);
}

.page-about .about-tl__node {
  border-left: 2px solid transparent;
  padding-left: 0;
  transition: border-color .22s var(--ease), padding-left .22s var(--ease), background-color .22s var(--ease);
}

.page-about .about-tl__node[open] {
  border-left-color: var(--abt-green);
  padding-left: 14px;
  background: rgba(14, 22, 48, .55);
}

.page-about .about-tl__sum {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 17px 12px 17px 0;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-tl__sum:focus-visible {
  outline: 2px solid var(--abt-green);
  outline-offset: 2px;
}

.page-about .about-tl__v {
  flex: none;
  width: 44px;
  font-size: 19px;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--abt-green);
}

.page-about .about-tl__v--now {
  color: var(--abt-red-lt);
}

.page-about .about-tl__name {
  flex: 1 1 auto;
  min-width: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 17px;
  letter-spacing: .02em;
  color: var(--paper);
}

.page-about .about-tl__arrow {
  flex: none;
  width: 9px;
  height: 9px;
  margin-right: 6px;
  border-right: 2px solid var(--silver-dim);
  border-bottom: 2px solid var(--silver-dim);
  transform: rotate(45deg);
  transition: transform .22s var(--ease), border-color .22s var(--ease);
}

.page-about .about-tl__node[open] .about-tl__arrow {
  transform: rotate(-135deg);
  border-color: var(--abt-green);
}

.page-about .about-tl__node--now[open] {
  border-left-color: var(--abt-red);
}

.page-about .about-tl__body {
  padding: 0 12px 22px 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--silver-dim);
}

.page-about .about-tl__body p {
  margin: 0;
  max-width: 44em;
}

/* ---------- 维护节奏 ---------- */

.page-about .about-rhythm {
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
}

.page-about .about-rhythm__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 18px 0;
  border-top: var(--abt-rule);
}

.page-about .about-rhythm__row:last-child {
  border-bottom: var(--abt-rule);
}

.page-about .about-rhythm__key {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 16px;
  letter-spacing: .02em;
  color: var(--paper);
}

.page-about .about-rhythm__val {
  margin: 0;
  font-size: 15px;
  font-weight: 700;
  color: var(--abt-green);
}

.page-about .about-rhythm__note {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--silver-dim);
}

/* ---------- 合作共建 ---------- */

.page-about .about-partner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
}

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

.page-about .about-partner__text p {
  margin: 0 0 16px;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--silver);
  max-width: 42em;
}

.page-about .about-partner__list {
  list-style: none;
  margin: 0 0 22px;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.page-about .about-partner__list li {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 12px 14px;
  border-left: 2px solid var(--abt-green-deep);
  background: rgba(14, 22, 48, .65);
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--silver-dim);
}

.page-about .about-partner__tag {
  font-size: 12.5px;
  letter-spacing: .12em;
  color: var(--abt-green);
}

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

/* ---------- 联系方式 ---------- */

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

.page-about .about-contact__item {
  padding: 18px 16px 20px;
  border: var(--abt-rule);
  border-left: 3px solid var(--abt-red);
  border-radius: var(--radius);
  background: var(--midnight-700);
}

.page-about .about-contact__label {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--silver-dim);
}

.page-about .about-contact__value {
  margin: 0 0 14px;
  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: 22px 0 0;
  padding-top: 18px;
  border-top: var(--abt-rule);
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--silver-dim);
  max-width: 46em;
}

/* ---------- 响应式 ---------- */

@media (min-width: 700px) {
  .page-about .about-cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-zones {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-rhythm__row {
    grid-template-columns: 190px minmax(0, 1fr);
    gap: 4px 24px;
    align-items: baseline;
  }

  .page-about .about-rhythm__key {
    grid-column: 1;
    grid-row: 1;
  }

  .page-about .about-rhythm__val {
    grid-column: 2;
    grid-row: 1;
    text-align: left;
  }

  .page-about .about-rhythm__note {
    grid-column: 2;
    grid-row: 2;
  }

  .page-about .about-contact {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-contact__item--wide {
    grid-column: 1 / -1;
  }

  .page-about .about-partner__list li {
    flex-direction: row;
    align-items: baseline;
    gap: 14px;
  }

  .page-about .about-partner__tag {
    flex: none;
    width: 88px;
  }
}

@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.18fr) minmax(0, .82fr);
    gap: clamp(36px, 5vw, 76px);
    align-items: start;
  }

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

  .page-about .about-partner {
    grid-template-columns: minmax(0, .8fr) minmax(0, 1.2fr);
    gap: clamp(28px, 4vw, 48px);
    align-items: start;
  }

  .page-about .about-tl__body {
    padding-left: 58px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-shell {
    grid-template-columns: 190px minmax(0, 1fr);
    gap: clamp(36px, 5vw, 76px);
    align-items: start;
  }

  .page-about .about-toc {
    display: block;
    position: relative;
  }

  .page-about .about-toc__inner {
    position: sticky;
    top: calc(var(--topbar-h) + 32px);
  }

  .page-about .about-chapter__desc,
  .page-about .about-chapter p {
    font-size: 16px;
  }
}

@media (max-width: 640px) {
  .page-about .about-hero__title br {
    display: none;
  }

  .page-about .about-hero__side {
    border-left: none;
    border-top: 2px solid var(--abt-green-deep);
    padding-left: 0;
    padding-top: 20px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-hero::before {
    animation: none;
  }

  .page-about .about-toc__list a,
  .page-about .about-tl__node,
  .page-about .about-tl__arrow {
    transition-duration: .01ms;
  }
}
<<<END>>>