.page-about {
  --about-line: rgba(230, 247, 255, .14);
  --about-line-soft: rgba(230, 247, 255, .07);
  --about-card: rgba(11, 34, 61, .58);
  --about-pad: clamp(1rem, 4vw, 2.25rem);
  color: var(--mist);
  padding-bottom: 1rem;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  display: grid;
  gap: 2rem;
  padding-top: 1.25rem;
  padding-bottom: 2.75rem;
  border-bottom: 1px solid var(--about-line-soft);
}

.page-about .about-hero__text {
  display: flex;
  flex-direction: column;
  gap: 1.15rem;
  min-width: 0;
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2.1rem, 7.4vw, 4.3rem);
  line-height: 1.06;
  letter-spacing: -.02em;
  font-weight: 900;
  margin: 0;
  color: var(--mist);
  text-wrap: balance;
}

.page-about .about-hero__lead {
  margin: 0;
  max-width: 34em;
  color: var(--silver);
  font-size: clamp(.98rem, 2.6vw, 1.06rem);
  line-height: 1.85;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: .65rem;
  margin-top: .25rem;
}

.page-about .about-hero__stats .stat {
  padding: .8rem .9rem;
  border: 1px solid var(--about-line);
  border-radius: 14px;
  background: var(--about-card);
}

.page-about .about-hero__stats .stat__value {
  display: block;
  font-size: clamp(1.4rem, 5vw, 1.85rem);
  color: var(--cyan);
  line-height: 1.1;
}

.page-about .about-hero__stats .stat__label {
  display: block;
  margin-top: .3rem;
  font-size: .8rem;
  color: var(--silver);
  letter-spacing: .02em;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .65rem;
  margin-top: .35rem;
}

.page-about .about-hero__figure {
  margin: 0;
  min-width: 0;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--about-line);
  box-shadow: 0 24px 60px rgba(2, 10, 20, .55);
}

.page-about .about-hero__figure .media-frame {
  border-radius: 0;
}

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

.page-about .about-hero__figure figcaption {
  padding: .7rem 1rem;
  font-size: .72rem;
  letter-spacing: .1em;
  color: var(--silver);
  background: rgba(2, 10, 20, .55);
  border-top: 1px solid var(--about-line-soft);
}

.page-about .about-hero > .vertical-note {
  display: none;
}

/* ---------- 主体：目录 + 章节 ---------- */
.page-about .about-body {
  display: grid;
  gap: 2rem;
  padding-top: 2.5rem;
  padding-bottom: 3rem;
}

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

.page-about .about-toc__title {
  font-size: .7rem;
  letter-spacing: .22em;
  color: var(--cyan);
  margin: 0 0 .9rem;
}

.page-about .about-toc__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: .55rem;
  border-left: 1px solid var(--about-line);
}

.page-about .about-toc__list a {
  display: flex;
  gap: .5rem;
  align-items: baseline;
  padding: .2rem 0 .2rem .8rem;
  color: var(--silver);
  text-decoration: none;
  font-size: .88rem;
  border-left: 2px solid transparent;
  margin-left: -1px;
  transition: color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}

.page-about .about-toc__list a:hover,
.page-about .about-toc__list a:focus-visible {
  color: var(--mist);
  border-left-color: var(--cyan);
}

.page-about .about-toc__list .mono {
  color: var(--cyan);
  font-size: .75rem;
}

.page-about .about-sections {
  display: flex;
  flex-direction: column;
  gap: clamp(2.5rem, 6vw, 4.5rem);
  min-width: 0;
}

.page-about .about-section {
  min-width: 0;
}

.page-about .about-section .section-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
}

.page-about .about-section h2 {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 4.6vw, 2.35rem);
  line-height: 1.2;
  font-weight: 800;
  margin: .25rem 0 0;
  color: var(--mist);
  text-wrap: balance;
}

.page-about .about-section .section-index {
  flex: none;
  font-size: clamp(2rem, 8vw, 3.6rem);
  line-height: .85;
  color: transparent;
  -webkit-text-stroke: 1px rgba(34, 211, 238, .45);
  opacity: .85;
}

.page-about .about-section__intro {
  margin: 1rem 0 1.35rem;
  max-width: 46em;
  color: var(--silver);
  line-height: 1.8;
  font-size: .96rem;
}

/* ---------- 两栏正文 ---------- */
.page-about .about-cols {
  display: grid;
  gap: 1.5rem;
  margin-top: 1.5rem;
}

.page-about .about-cols__main p {
  margin: 0 0 1rem;
  color: var(--silver);
  line-height: 1.9;
  font-size: .97rem;
}

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

.page-about .about-cols__side {
  padding: 1.1rem 1.15rem;
  border: 1px solid var(--about-line);
  border-left: 3px solid var(--cyan);
  border-radius: 0 14px 14px 0;
  background: var(--about-card);
}

.page-about .about-cols__side .mono {
  margin: 0 0 .55rem;
  font-size: .9rem;
  color: var(--mist);
  letter-spacing: .02em;
}

.page-about .about-cols__note {
  margin: .85rem 0 0;
  padding-top: .85rem;
  border-top: 1px dashed var(--about-line);
  font-size: .88rem;
  line-height: 1.8;
  color: var(--silver);
}

.page-about .about-cols__figure {
  margin: 0;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--about-line);
  background: var(--ink-800);
}

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

.page-about .about-cols__figure figcaption {
  padding: .6rem .9rem;
  font-size: .7rem;
  letter-spacing: .08em;
  color: var(--silver);
  border-top: 1px solid var(--about-line-soft);
  background: rgba(2, 10, 20, .5);
}

/* ---------- 筛选栏补充 ---------- */
.page-about .filter-bar {
  margin-bottom: 1.5rem;
}

.page-about .filter-count {
  font-size: .74rem;
  color: var(--cyan);
  letter-spacing: .08em;
  align-self: center;
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 1.7rem;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: .6rem;
  bottom: .6rem;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--cyan), rgba(34, 211, 238, .12) 70%, rgba(167, 139, 250, .1));
}

.page-about .tl-item {
  position: relative;
  padding-bottom: 1.1rem;
}

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

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -1.7rem;
  top: .75rem;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 2px solid var(--cyan);
  box-shadow: 0 0 0 4px rgba(34, 211, 238, .1);
}

.page-about .tl-card {
  padding: .95rem 1.05rem;
  border: 1px solid var(--about-line-soft);
  border-radius: 14px;
  background: var(--about-card);
  transition: border-color var(--t-fast) var(--ease), transform var(--t-fast) var(--ease);
}

.page-about .tl-card:hover {
  border-color: rgba(34, 211, 238, .45);
  transform: translateX(3px);
}

.page-about .tl-year {
  display: inline-block;
  font-size: 1.05rem;
  letter-spacing: .1em;
  color: var(--orange);
}

.page-about .tl-title {
  margin: .35rem 0 .4rem;
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--mist);
  line-height: 1.4;
}

.page-about .tl-desc {
  margin: 0;
  font-size: .9rem;
  line-height: 1.8;
  color: var(--silver);
}

/* ---------- 团队折叠 ---------- */
.page-about .team-grid {
  display: grid;
  gap: .7rem;
  margin-top: 1.75rem;
}

.page-about .team-item {
  border: 1px solid var(--about-line);
  border-radius: 14px;
  background: var(--about-card);
  overflow: hidden;
}

.page-about .team-item__summary {
  display: flex;
  align-items: baseline;
  gap: .6rem;
  padding: .9rem 1rem;
  cursor: pointer;
  list-style: none;
  font-weight: 700;
  font-size: .95rem;
  color: var(--mist);
  transition: color var(--t-fast) var(--ease);
}

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

.page-about .team-item__summary:hover {
  color: var(--cyan);
}

.page-about .team-item__summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  color: var(--cyan);
  font-size: 1.05rem;
}

.page-about .team-item[open] .team-item__summary::after {
  content: "−";
}

.page-about .team-item[open] .team-item__summary {
  border-bottom: 1px solid var(--about-line-soft);
}

.page-about .team-item__body {
  padding: .9rem 1rem 1rem;
  font-size: .9rem;
  line-height: 1.85;
  color: var(--silver);
}

/* ---------- 场馆字段 ---------- */
.page-about .field-heading {
  margin: 2rem 0 .9rem;
  font-size: 1rem;
  font-weight: 700;
  color: var(--mist);
  letter-spacing: .02em;
}

.page-about .field-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: .55rem;
}

.page-about .field-item {
  display: flex;
  align-items: center;
  gap: .55rem;
  padding: .7rem .8rem;
  border: 1px solid var(--about-line-soft);
  border-radius: 10px;
  background: rgba(11, 34, 61, .45);
  font-size: .88rem;
  color: var(--mist);
}

.page-about .field-item .mono {
  color: var(--violet);
  font-size: .72rem;
  letter-spacing: .06em;
}

/* ---------- 合作生态 ---------- */
.page-about .eco-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: .7rem;
}

.page-about .eco-node {
  position: relative;
  padding: 1rem 1.05rem;
  border: 1px solid var(--about-line-soft);
  border-radius: 14px;
  background: linear-gradient(135deg, rgba(11, 34, 61, .75), rgba(6, 20, 38, .55));
  transition: border-color var(--t-mid) var(--ease), box-shadow var(--t-mid) var(--ease);
}

.page-about .eco-node:hover,
.page-about .eco-node:focus-within {
  border-color: rgba(34, 211, 238, .55);
  box-shadow: 0 0 0 1px rgba(34, 211, 238, .18), 0 14px 34px rgba(2, 10, 20, .5);
}

.page-about .eco-node__num {
  display: block;
  font-size: clamp(1.3rem, 5vw, 1.7rem);
  color: var(--cyan);
  line-height: 1.1;
}

.page-about .eco-node p {
  margin: .45rem 0 0;
  font-size: .88rem;
  line-height: 1.75;
  color: var(--silver);
}

/* ---------- 入口与联系 ---------- */
.page-about .next-links {
  display: grid;
  gap: .65rem;
  margin-top: 1.5rem;
}

.page-about .next-link {
  display: grid;
  grid-template-columns: auto 1fr;
  grid-template-areas:
    "num label"
    "num desc";
  gap: .15rem .8rem;
  padding: .95rem 1rem;
  border: 1px solid var(--about-line);
  border-radius: 14px;
  background: var(--about-card);
  text-decoration: none;
  color: inherit;
  transition: border-color var(--t-fast) var(--ease), transform var(--t-fast) var(--ease);
}

.page-about .next-link:hover,
.page-about .next-link:focus-visible {
  border-color: var(--orange);
  transform: translateY(-2px);
}

.page-about .next-link__num {
  grid-area: num;
  align-self: center;
  width: 2rem;
  height: 2rem;
  display: grid;
  place-items: center;
  border-radius: 8px;
  background: rgba(255, 138, 61, .14);
  color: var(--orange);
  font-size: .85rem;
}

.page-about .next-link__label {
  grid-area: label;
  font-weight: 700;
  font-size: .97rem;
  color: var(--mist);
}

.page-about .next-link__desc {
  grid-area: desc;
  font-size: .84rem;
  line-height: 1.7;
  color: var(--silver);
}

.page-about .about-contact {
  display: grid;
  gap: 1rem;
  margin-top: 1.5rem;
  padding: 1.25rem 1.15rem;
  border: 1px solid var(--about-line);
  border-radius: var(--radius);
  background: linear-gradient(120deg, rgba(34, 211, 238, .1), rgba(2, 10, 20, .5) 60%);
}

.page-about .about-contact h3 {
  margin: 0 0 .5rem;
  font-size: 1.1rem;
  color: var(--mist);
}

.page-about .about-contact__text p {
  margin: 0 0 .5rem;
  font-size: .91rem;
  line-height: 1.8;
  color: var(--silver);
}

.page-about .about-contact__text p.mono {
  color: var(--mist);
  font-size: .84rem;
  letter-spacing: .02em;
}

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

.page-about .about-contact__icp {
  margin: 1rem 0 0;
  font-size: .74rem;
  letter-spacing: .06em;
  color: var(--silver);
}

/* ---------- 平板及以上 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .field-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

  .page-about .about-contact {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
    align-items: center;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, .94fr);
    align-items: center;
    gap: 3rem;
    padding-top: 2rem;
    padding-bottom: 3.75rem;
  }

  .page-about .about-cols {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, .65fr);
    align-items: start;
    gap: 2rem;
  }

  .page-about .about-cols--flip {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
  }

  .page-about .about-timeline {
    padding-left: 2rem;
  }

  .page-about .tl-item::before {
    left: -2rem;
  }

  .page-about .eco-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 1024px) {
  .page-about .about-body {
    grid-template-columns: 200px minmax(0, 1fr);
    gap: 3.5rem;
    padding-top: 3.5rem;
  }

  .page-about .about-toc {
    display: block;
    position: sticky;
    top: calc(var(--header-space) + 1.25rem);
    align-self: start;
  }

  .page-about .about-hero > .vertical-note {
    display: block;
    position: absolute;
    top: 3.2rem;
    right: 0;
    writing-mode: vertical-rl;
    font-family: var(--font-mono);
    font-size: .68rem;
    letter-spacing: .32em;
    color: rgba(159, 179, 200, .6);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl-card:hover,
  .page-about .next-link:hover {
    transform: none;
  }
}
<<<END>>>