.page-about {
  position: relative;
  color: var(--white);
  background: var(--ink);
}

.page-about > * {
  position: relative;
  z-index: 1;
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb {
  padding-block: 18px 4px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--line-soft);
  background:
    radial-gradient(110% 85% at 90% 4%, rgba(40, 243, 225, .16), transparent 56%),
    radial-gradient(95% 80% at 4% 98%, rgba(47, 125, 255, .16), transparent 62%),
    linear-gradient(158deg, var(--ink-2) 0%, var(--ink) 62%);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(20, 52, 92, .72) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(20, 52, 92, .72) 1px, transparent 1px);
  background-size: 76px 76px;
  opacity: .45;
  mask-image: linear-gradient(180deg, #000 0%, #000 62%, transparent 100%);
}

.page-about .about-hero-shell {
  position: relative;
  display: grid;
  gap: 34px;
  padding-block: 34px 52px;
}

.page-about .about-hero-copy .eyebrow {
  margin: 0 0 16px;
}

.page-about .about-hero h1 {
  margin: 0 0 18px;
  font-family: var(--font-sans);
  font-weight: 800;
  font-size: clamp(1.85rem, 5.4vw, 3.5rem);
  line-height: 1.14;
  letter-spacing: .03em;
  color: var(--white);
}

.page-about .about-hero h1 em {
  font-style: normal;
  color: var(--cyan);
  box-shadow: inset 0 -.16em 0 var(--orange-soft);
}

.page-about .about-hero-lead {
  max-width: 47ch;
  margin: 0 0 26px;
  font-size: 1rem;
  line-height: 1.78;
  color: var(--steel);
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--line);
}

.page-about .about-stat {
  padding: 13px 12px 14px;
  background: rgba(10, 26, 51, .86);
}

.page-about .about-stat-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.4rem;
  font-weight: 700;
  line-height: 1.1;
  color: var(--cyan);
  letter-spacing: -.01em;
}

.page-about .about-stat-num small {
  margin-left: 3px;
  font-size: .58em;
  font-weight: 500;
  color: var(--steel);
  letter-spacing: .04em;
}

.page-about .about-stat-label {
  display: block;
  margin-top: 5px;
  font-size: .875rem;
  color: var(--steel);
  letter-spacing: .05em;
}

.page-about .about-hero-media {
  margin: 0;
}

.page-about .about-hero-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
  border-radius: var(--r-lg);
  clip-path: polygon(0 0, 100% 0, 100% 86%, 10% 100%);
  background: linear-gradient(150deg, var(--panel), var(--ink-2));
}

.page-about .about-hero-media .media-caption {
  margin-top: 12px;
  font-size: .875rem;
  line-height: 1.6;
  color: var(--steel);
}

/* ---------- 主体骨架 ---------- */
.page-about .about-body {
  display: grid;
  gap: 30px;
  padding-block: 44px 68px;
}

.page-about .about-rail-title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: .8125rem;
  letter-spacing: .16em;
  color: var(--steel);
  text-transform: uppercase;
}

.page-about .about-rail-list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-rail-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 13px;
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  font-size: .9375rem;
  color: var(--steel);
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .about-rail-link:hover,
.page-about .about-rail-link:focus-visible {
  color: var(--cyan);
  border-color: rgba(40, 243, 225, .5);
  background: var(--cyan-soft);
}

.page-about .about-rail-num {
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .1em;
  color: var(--cyan);
}

.page-about .about-content {
  display: grid;
  gap: 52px;
  min-width: 0;
}

/* ---------- 章节通用 ---------- */
.page-about .about-sec {
  min-width: 0;
  scroll-margin-top: calc(var(--hd-h) + 28px);
}

.page-about .about-sec-head {
  padding-bottom: 16px;
  margin-bottom: 22px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-sec-head .eyebrow {
  margin: 0 0 10px;
}

.page-about .about-sec-head h2 {
  margin: 0 0 10px;
  font-size: clamp(1.35rem, 3.4vw, 2rem);
  font-weight: 800;
  line-height: 1.22;
  letter-spacing: .02em;
  color: var(--white);
}

.page-about .about-sec-head p {
  max-width: 62ch;
  margin: 0;
  font-size: 1rem;
  line-height: 1.78;
  color: var(--steel);
}

/* ---------- 01 起点 ---------- */
.page-about .about-pillars {
  display: grid;
  gap: 14px;
}

.page-about .about-pillar {
  position: relative;
  padding: 20px 18px 22px;
  border: 1px solid var(--line);
  background:
    linear-gradient(164deg, rgba(40, 243, 225, .07), transparent 46%),
    linear-gradient(180deg, rgba(27, 47, 78, .92), rgba(10, 26, 51, .92));
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%);
}

.page-about .about-pillar::after {
  content: "";
  position: absolute;
  left: 18px;
  top: 0;
  width: 36px;
  height: 2px;
  background: var(--cyan);
}

.page-about .about-pillar-idx {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .18em;
  color: var(--orange);
}

.page-about .about-pillar h3 {
  margin: 0 0 10px;
  font-size: 1.0625rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--white);
}

.page-about .about-pillar p:last-child {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.78;
  color: var(--steel);
}

/* ---------- 02 时间轴 ---------- */
.page-about .about-timeline {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-tl-item {
  position: relative;
  padding-left: 32px;
  padding-bottom: 14px;
}

.page-about .about-tl-item::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 18px;
  bottom: 0;
  width: 1px;
  background: linear-gradient(180deg, var(--line), rgba(20, 52, 92, .08));
}

.page-about .about-tl-item:last-child::before {
  display: none;
}

.page-about .about-tl-item::after {
  content: "";
  position: absolute;
  left: 4px;
  top: 12px;
  width: 11px;
  height: 11px;
  border: 2px solid var(--cyan);
  border-radius: 50%;
  background: var(--ink);
  box-shadow: 0 0 0 4px rgba(40, 243, 225, .1);
}

.page-about .about-tl-node {
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: rgba(10, 26, 51, .74);
  transition: border-color var(--dur) var(--ease);
}

.page-about .about-tl-node[open] {
  border-color: rgba(40, 243, 225, .34);
}

.page-about .about-tl-summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  padding: 13px 15px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-tl-summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 1.05rem;
  line-height: 1;
  color: var(--steel);
}

.page-about .about-tl-node[open] .about-tl-summary::after {
  content: "−";
  color: var(--cyan);
}

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

.page-about .about-tl-year {
  font-family: var(--font-mono);
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--cyan);
}

.page-about .about-tl-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--white);
}

.page-about .about-tl-body {
  margin: 0;
  padding: 0 15px 15px;
  font-size: 1rem;
  line-height: 1.78;
  color: var(--steel);
}

/* ---------- 03 团队 ---------- */
.page-about .about-team-figure {
  margin: 0 0 20px;
}

.page-about .about-team-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  clip-path: polygon(0 0, 100% 0, 100% 90%, 7% 100%);
  background: linear-gradient(150deg, var(--panel), var(--ink-2));
}

.page-about .about-team-figure .media-caption {
  margin-top: 10px;
  font-size: .875rem;
  line-height: 1.6;
  color: var(--steel);
}

.page-about .about-team-grid {
  display: grid;
  gap: 14px;
}

.page-about .about-team-card {
  position: relative;
  padding: 22px 18px 20px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background:
    linear-gradient(158deg, rgba(47, 125, 255, .1), transparent 44%),
    var(--ink-2);
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .about-team-card:hover,
.page-about .about-team-card:focus-within {
  border-color: rgba(40, 243, 225, .45);
  transform: translateY(-3px);
}

.page-about .about-team-num {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 2.1rem;
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-team-num small {
  margin-left: 5px;
  font-size: .4em;
  font-weight: 500;
  letter-spacing: .08em;
  color: var(--steel);
}

.page-about .about-team-card h3 {
  margin: 0 0 10px;
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--white);
}

.page-about .about-team-card p:last-child {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.78;
  color: var(--steel);
}

.page-about .about-team-note {
  margin: 18px 0 0;
  padding: 14px 16px;
  border-left: 2px solid var(--orange);
  background: var(--orange-soft);
  font-size: .9375rem;
  line-height: 1.75;
  color: var(--white);
}

/* ---------- 04 内容生产 ---------- */
.page-about .about-flow {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-flow-step {
  position: relative;
  padding: 18px 16px 20px;
  border: 1px solid var(--line);
  border-top: 2px solid var(--cyan);
  border-radius: 0 0 var(--r-md) var(--r-md);
  background: rgba(10, 26, 51, .72);
}

.page-about .about-flow-idx {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .16em;
  color: var(--cyan);
}

.page-about .about-flow-step h3 {
  margin: 0 0 8px;
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--white);
}

.page-about .about-flow-step p {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.76;
  color: var(--steel);
}

/* ---------- 05 合作生态 ---------- */
.page-about .about-partner-grid {
  display: grid;
  gap: 14px;
}

.page-about .about-partner {
  position: relative;
  padding: 20px 18px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: linear-gradient(180deg, rgba(27, 47, 78, .9), rgba(10, 26, 51, .9));
}

.page-about .about-partner::before {
  content: "";
  position: absolute;
  left: 0;
  top: 20px;
  bottom: 20px;
  width: 2px;
}

.page-about .about-partner--media::before {
  background: var(--orange);
}

.page-about .about-partner--data::before {
  background: var(--blue);
}

.page-about .about-partner--campus::before {
  background: var(--cyan);
}

.page-about .about-partner-role {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: .8125rem;
  letter-spacing: .14em;
  color: var(--steel);
}

.page-about .about-partner-count {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 1.9rem;
  font-weight: 700;
  line-height: 1;
  color: var(--white);
}

.page-about .about-partner-count span {
  margin-left: 4px;
  font-size: .42em;
  font-weight: 500;
  color: var(--steel);
  letter-spacing: .08em;
}

.page-about .about-partner--media .about-partner-count { color: var(--orange); }
.page-about .about-partner--data .about-partner-count { color: var(--blue); }
.page-about .about-partner--campus .about-partner-count { color: var(--cyan); }

.page-about .about-partner-desc {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.76;
  color: var(--steel);
}

.page-about .about-net {
  margin: 20px 0 0;
  padding: 14px 10px 10px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background:
    radial-gradient(80% 100% at 20% 50%, rgba(40, 243, 225, .1), transparent 70%),
    rgba(5, 11, 24, .82);
}

.page-about .about-net-svg {
  display: block;
  width: 100%;
  height: auto;
  max-width: 720px;
  margin: 0 auto;
}

.page-about .net-grid line {
  stroke: rgba(20, 52, 92, .55);
  stroke-width: 1;
  stroke-dasharray: 3 7;
}

.page-about .net-link {
  stroke: rgba(40, 243, 225, .24);
  stroke-width: 1.2;
  transition: stroke var(--dur) var(--ease), stroke-width var(--dur) var(--ease);
}

.page-about .net-hub {
  fill: rgba(10, 26, 51, .95);
  stroke-width: 1.6;
  transition: fill var(--dur) var(--ease);
}

.page-about .net-dot {
  fill: var(--cyan);
}

.page-about .net-node--media .net-hub { stroke: var(--orange); }
.page-about .net-node--media .net-dot { fill: var(--orange); }
.page-about .net-node--data .net-hub { stroke: var(--blue); }
.page-about .net-node--data .net-dot { fill: var(--blue); }
.page-about .net-node--campus .net-hub { stroke: var(--cyan); }

.page-about .net-node:hover .net-link {
  stroke: var(--cyan);
  stroke-width: 2.2;
}

.page-about .net-node:hover .net-hub {
  fill: var(--panel);
}

.page-about .net-label {
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 700;
  fill: var(--white);
}

.page-about .net-root {
  fill: var(--ink);
  stroke: var(--cyan);
  stroke-width: 2;
}

.page-about .net-root-label {
  font-family: var(--font-mono);
  font-size: 13px;
  fill: var(--steel);
  letter-spacing: .06em;
}

.page-about .about-net .media-caption {
  margin-top: 8px;
  font-size: .875rem;
  line-height: 1.6;
  text-align: center;
  color: var(--steel);
}

/* ---------- 06 下一步 ---------- */
.page-about .about-next {
  display: grid;
  gap: 12px;
}

.page-about .about-next-card {
  display: grid;
  grid-template-columns: auto 1fr auto;
  grid-template-areas:
    "num title arrow"
    "num desc arrow";
  gap: 2px 14px;
  align-items: center;
  padding: 16px 16px 16px 18px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: rgba(10, 26, 51, .72);
  text-decoration: none;
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .about-next-card:hover,
.page-about .about-next-card:focus-visible {
  border-color: rgba(255, 122, 26, .55);
  background: rgba(27, 47, 78, .9);
}

.page-about .about-next-num {
  grid-area: num;
  font-family: var(--font-mono);
  font-size: .8125rem;
  letter-spacing: .12em;
  color: var(--orange);
}

.page-about .about-next-title {
  grid-area: title;
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--white);
}

.page-about .about-next-desc {
  grid-area: desc;
  font-size: .9375rem;
  line-height: 1.6;
  color: var(--steel);
}

.page-about .about-next-arrow {
  grid-area: arrow;
  font-family: var(--font-mono);
  font-size: 1.15rem;
  color: var(--orange);
  transition: transform var(--dur) var(--ease);
}

.page-about .about-next-card:hover .about-next-arrow {
  transform: translateX(4px);
}

.page-about .about-contact {
  margin-top: 18px;
  padding: 20px 18px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background:
    linear-gradient(150deg, rgba(47, 125, 255, .12), transparent 58%),
    var(--ink-2);
}

.page-about .about-contact-title {
  margin: 0 0 14px;
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--white);
}

.page-about .about-contact-list {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-contact-list li {
  display: grid;
  gap: 3px;
  padding-bottom: 10px;
  border-bottom: 1px dashed var(--line-soft);
}

.page-about .about-contact-list li:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-about .about-contact-key {
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .14em;
  color: var(--steel);
}

.page-about .about-contact-val {
  font-size: .9375rem;
  line-height: 1.6;
  color: var(--white);
  word-break: break-all;
}

.page-about .about-contact-note {
  margin: 14px 0 0;
  font-size: .875rem;
  line-height: 1.72;
  color: var(--steel);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

  .page-about .about-next-card {
    padding: 18px 18px 18px 20px;
  }
}

@media (min-width: 760px) {
  .page-about .about-pillars {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

  .page-about .about-hero-lead {
    font-size: 1.0625rem;
  }

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

  .page-about .about-next-card {
    grid-template-columns: 1fr;
    grid-template-areas:
      "num"
      "title"
      "desc";
    gap: 6px;
    align-items: start;
  }

  .page-about .about-next-arrow {
    display: none;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero-shell {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    align-items: center;
    gap: 52px;
    padding-block: 66px 88px;
  }

  .page-about .about-hero-media {
    position: relative;
  }

  .page-about .about-hero-media::before {
    content: "";
    position: absolute;
    inset: 16px -16px -16px 16px;
    border: 1px solid rgba(40, 243, 225, .3);
    border-radius: var(--r-lg);
    pointer-events: none;
  }

  .page-about .about-flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 12px;
  }

  .page-about .about-flow-step::after {
    content: "";
    position: absolute;
    right: -8px;
    top: 30px;
    width: 7px;
    height: 7px;
    border-top: 1px solid var(--cyan);
    border-right: 1px solid var(--cyan);
    transform: rotate(45deg);
    opacity: .65;
  }

  .page-about .about-flow-step:last-child::after {
    display: none;
  }
}

@media (min-width: 1024px) {
  .page-about .about-body {
    grid-template-columns: 208px minmax(0, 1fr);
    gap: 54px;
    padding-block: 56px 84px;
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--hd-h) + 26px);
    align-self: start;
  }

  .page-about .about-rail-list {
    display: block;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-rail-list li + li {
    margin-top: 6px;
  }

  .page-about .about-rail-link {
    display: flex;
    white-space: normal;
    border-left: 2px solid transparent;
    border-radius: 0 var(--r-sm) var(--r-sm) 0;
  }

  .page-about .about-rail-link:hover,
  .page-about .about-rail-link:focus-visible {
    border-left-color: var(--cyan);
  }

  .page-about .about-content {
    gap: 62px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-team-card,
  .page-about .about-next-arrow,
  .page-about .net-link,
  .page-about .net-hub,
  .page-about .about-rail-link {
    transition: none;
  }

  .page-about .about-team-card:hover,
  .page-about .about-team-card:focus-within {
    transform: none;
  }

  .page-about .about-next-card:hover .about-next-arrow {
    transform: none;
  }
}
<<<END>>>