.page-about {
  --about-rail-w: 216px;
  padding-bottom: clamp(3rem, 7vw, 5.5rem);
}

.page-about [id] {
  scroll-margin-top: 96px;
}

/* ---------- 首屏封面 ---------- */
.page-about .about-hero {
  position: relative;
  display: grid;
  gap: 1rem;
  padding-block: clamp(1.2rem, 3.5vw, 2.2rem) clamp(1.6rem, 4vw, 2.6rem);
  border-bottom: 1px solid var(--line);
  background-image: linear-gradient(90deg, rgba(30, 71, 61, .55) 0 1px, transparent 1px);
  background-size: 84px 100%;
  background-repeat: repeat-x;
}

.page-about .about-kicker {
  margin: 0;
  font-size: .78rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--mint);
}

.page-about .about-kicker .mono {
  color: var(--fog);
  letter-spacing: .1em;
}

.page-about .about-title {
  margin: 0;
  font-size: clamp(2.1rem, 7.2vw, 4.4rem);
  line-height: .98;
  letter-spacing: -.02em;
  font-weight: 800;
  color: var(--bone);
  max-width: 18ch;
}

.page-about .about-lead {
  margin: 0;
  max-width: 60ch;
  font-size: clamp(1rem, 2.4vw, 1.1rem);
  line-height: 1.7;
  color: var(--fog);
}

.page-about .about-facts {
  list-style: none;
  margin: .6rem 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: .9rem 1.2rem;
}

.page-about .about-fact {
  display: grid;
  gap: .2rem;
  padding-top: .6rem;
  border-top: 1px solid var(--line);
}

.page-about .about-fact-num {
  font-size: clamp(1.4rem, 4.4vw, 1.9rem);
  font-weight: 700;
  line-height: 1;
  color: var(--mint);
}

.page-about .about-fact:nth-child(2) .about-fact-num {
  color: var(--orange);
}

.page-about .about-fact:nth-child(3) .about-fact-num {
  color: var(--violet);
}

.page-about .about-fact:nth-child(4) .about-fact-num {
  color: var(--sun);
}

.page-about .about-fact-label {
  font-size: .82rem;
  line-height: 1.4;
  color: var(--dim);
}

.page-about .about-hero-media {
  margin-top: .8rem;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  overflow: hidden;
  background: var(--ink-800);
  position: relative;
}

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

/* ---------- 主体：吸附索引 + 叙事流 ---------- */
.page-about .about-body {
  display: grid;
  gap: 1.4rem;
  padding-top: clamp(1.4rem, 4vw, 2.4rem);
}

.page-about .about-rail {
  border-left: 2px solid var(--orange);
  padding-left: .9rem;
}

.page-about .about-rail-title {
  margin: 0 0 .6rem;
  font-size: .72rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--dim);
}

.page-about .about-rail-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: .5rem;
  overflow-x: auto;
  scrollbar-width: none;
  padding-bottom: .2rem;
}

.page-about .about-rail-list::-webkit-scrollbar {
  display: none;
}

.page-about .about-rail-link {
  display: inline-flex;
  align-items: baseline;
  gap: .4rem;
  white-space: nowrap;
  padding: .38rem .72rem;
  font-size: .86rem;
  color: var(--fog);
  text-decoration: none;
  background: var(--ink-800);
  border: 1px solid var(--line);
  border-radius: 999px;
  transition: color .18s var(--ease), border-color .18s var(--ease), transform .18s var(--ease);
}

.page-about .about-rail-link .mono {
  font-size: .72rem;
  color: var(--orange);
}

.page-about .about-rail-link:hover,
.page-about .about-rail-link:focus-visible {
  color: var(--ink-900);
  background: var(--mint);
  border-color: var(--mint);
  transform: translateY(-1px);
}

.page-about .about-rail-link:hover .mono,
.page-about .about-rail-link:focus-visible .mono {
  color: var(--ink-900);
}

/* ---------- 章节 ---------- */
.page-about .about-stream {
  display: grid;
  gap: clamp(1.6rem, 4vw, 2.6rem);
  min-width: 0;
}

.page-about .about-section {
  padding-bottom: clamp(1.4rem, 3.5vw, 2.2rem);
  border-bottom: 1px dashed var(--line-soft);
  min-width: 0;
}

.page-about .about-section--last {
  border-bottom: none;
  padding-bottom: 0;
}

.page-about .about-sec-num {
  margin: 0 0 .5rem;
  font-size: .74rem;
  letter-spacing: .16em;
  color: var(--mint);
}

.page-about .about-h2 {
  margin: 0 0 .9rem;
  font-size: clamp(1.45rem, 4.2vw, 2.1rem);
  line-height: 1.15;
  letter-spacing: -.01em;
  font-weight: 800;
  color: var(--bone);
  max-width: 24ch;
}

.page-about .about-section p {
  margin: 0 0 .85rem;
  font-size: 1rem;
  line-height: 1.72;
  color: var(--fog);
}

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

/* ---------- 内嵌图 ---------- */
.page-about .about-inline-media {
  margin: 1.1rem 0 1.2rem;
  border: 1px solid var(--line);
  border-radius: var(--r-md) var(--r-lg) var(--r-md) var(--r-lg);
  overflow: hidden;
  background: var(--ink-800);
  position: relative;
}

.page-about .about-inline-media--narrow {
  max-width: 460px;
}

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

.page-about .about-inline-media .media__caption,
.page-about .about-hero-media .media__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  margin: 0;
  padding: .55rem .85rem;
  font-size: .76rem;
  line-height: 1.4;
  color: var(--bone);
  background: linear-gradient(180deg, rgba(7, 27, 22, 0) 0%, rgba(7, 27, 22, .92) 62%);
}

/* ---------- 团队四象限 ---------- */
.page-about .about-team {
  display: grid;
  gap: .8rem;
  margin-top: 1.2rem;
}

.page-about .about-role {
  background: var(--ink-800);
  border: 1px solid var(--line);
  border-left: 3px solid var(--mint);
  border-radius: var(--r-sm) var(--r-md) var(--r-sm) var(--r-md);
  padding: .85rem 1rem;
  transition: border-color .2s var(--ease), background .2s var(--ease);
}

.page-about .about-role--mint { border-left-color: var(--mint); }
.page-about .about-role--orange { border-left-color: var(--orange); }
.page-about .about-role--violet { border-left-color: var(--violet); }
.page-about .about-role--sun { border-left-color: var(--sun); }

.page-about .about-role[open] {
  background: var(--ink-700);
}

.page-about .about-role summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: baseline;
  gap: .6rem;
  justify-content: space-between;
}

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

.page-about .about-role summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 1.05rem;
  line-height: 1;
  color: var(--mint);
}

.page-about .about-role[open] summary::after {
  content: "–";
}

.page-about .about-role-name {
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--bone);
}

.page-about .about-role-tag {
  margin-left: auto;
  font-size: .7rem;
  letter-spacing: .1em;
  color: var(--dim);
}

.page-about .about-role p {
  margin: .7rem 0 0;
  font-size: .95rem;
  line-height: 1.68;
  color: var(--fog);
}

/* ---------- 合作节点 ---------- */
.page-about .about-nodes {
  list-style: none;
  margin: 1.2rem 0 1.2rem;
  padding: 0;
  display: grid;
  gap: .7rem;
}

.page-about .about-node {
  position: relative;
  display: grid;
  gap: .25rem;
  padding: .85rem .95rem .9rem 1.9rem;
  background: var(--ink-800);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  transition: border-color .2s var(--ease), transform .2s var(--ease);
}

.page-about .about-node-dot {
  position: absolute;
  left: .85rem;
  top: 1.15rem;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--mint);
  box-shadow: 0 0 0 4px rgba(43, 245, 210, .12);
}

.page-about .about-node:nth-child(2) .about-node-dot {
  background: var(--orange);
  box-shadow: 0 0 0 4px rgba(255, 138, 61, .14);
}

.page-about .about-node:nth-child(3) .about-node-dot {
  background: var(--violet);
  box-shadow: 0 0 0 4px rgba(169, 139, 255, .14);
}

.page-about .about-node-name {
  font-size: .98rem;
  font-weight: 700;
  color: var(--bone);
}

.page-about .about-node-desc {
  font-size: .84rem;
  line-height: 1.5;
  color: var(--dim);
}

.page-about .about-node:hover {
  border-color: var(--mint);
  transform: translateY(-2px);
}

/* ---------- 荣誉档案 ---------- */
.page-about .about-award {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 1rem;
  align-items: start;
  padding: 1.1rem 1.15rem;
  background: var(--ink-700);
  border-radius: var(--r-lg) var(--r-sm) var(--r-lg) var(--r-sm);
  border: 1px solid var(--line);
}

.page-about .about-award-num {
  font-size: clamp(2.2rem, 7vw, 3.2rem);
  line-height: .9;
  font-weight: 700;
  color: var(--violet);
}

.page-about .about-award-title {
  margin: 0 0 .4rem;
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--bone);
}

.page-about .about-award-text {
  margin: 0;
  font-size: .9rem;
  line-height: 1.65;
  color: var(--fog);
}

/* ---------- 收束 ---------- */
.page-about .about-next {
  margin-top: .4rem;
  padding: clamp(1.3rem, 4vw, 2rem);
  background: var(--ink-800);
  border-top: 2px solid var(--orange);
  border-radius: var(--r-lg);
}

.page-about .about-next-title {
  margin: 0 0 .7rem;
  font-size: clamp(1.3rem, 3.8vw, 1.85rem);
  line-height: 1.2;
  font-weight: 800;
  color: var(--bone);
}

.page-about .about-next-text {
  margin: 0 0 1.1rem;
  max-width: 56ch;
  font-size: .97rem;
  line-height: 1.7;
  color: var(--fog);
}

.page-about .about-next-actions {
  display: flex;
  flex-wrap: wrap;
  gap: .6rem;
}

.page-about .about-next-contact {
  margin: 1.1rem 0 0;
  font-size: .84rem;
  letter-spacing: .02em;
  color: var(--dim);
  word-break: break-word;
}

/* ---------- 平板及以上 ---------- */
@media (min-width: 700px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-rail-list {
    flex-wrap: wrap;
    overflow: visible;
  }

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

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

  .page-about .about-node {
    padding-left: .95rem;
    padding-top: 1.7rem;
  }

  .page-about .about-node-dot {
    left: .95rem;
    top: .85rem;
  }
}

/* ---------- 桌面：吸附索引 + 叙事流 ---------- */
@media (min-width: 960px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: clamp(2rem, 4.5vw, 3.6rem);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 1.6rem;
    padding-left: 1rem;
  }

  .page-about .about-rail-list {
    display: grid;
    gap: .1rem;
  }

  .page-about .about-rail-link {
    display: flex;
    width: 100%;
    background: transparent;
    border: 1px solid transparent;
    border-radius: var(--r-sm);
    padding: .5rem .6rem;
  }

  .page-about .about-rail-link:hover,
  .page-about .about-rail-link:focus-visible {
    transform: translateX(3px);
  }

  .page-about .about-section p {
    max-width: 68ch;
  }

  .page-about .about-role:nth-child(2) {
    margin-top: 1.1rem;
  }

  .page-about .about-role:nth-child(4) {
    margin-top: .5rem;
  }

  .page-about .about-award {
    grid-template-columns: minmax(0, 128px) minmax(0, 1fr);
    gap: 1.4rem;
    padding: 1.4rem 1.5rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail-link,
  .page-about .about-node,
  .page-about .about-role {
    transition: none;
  }

  .page-about .about-rail-link:hover,
  .page-about .about-node:hover {
    transform: none;
  }
}
<<<END>>>