.page-about {
  --about-pad: clamp(20px, 3.2vw, 36px);
  --about-gap: clamp(18px, 3vw, 32px);
}

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(22px, 4.5vw, 54px) 0 clamp(26px, 4.5vw, 48px);
  background:
    radial-gradient(120% 90% at 88% 0%, rgba(184, 255, 63, 0.13), transparent 62%),
    radial-gradient(90% 70% at 0% 100%, rgba(255, 176, 58, 0.10), transparent 66%);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(26px, 4vw, 44px);
  align-items: end;
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(36px, 8.4vw, 74px);
  line-height: 0.98;
  letter-spacing: 0.01em;
  color: var(--paper);
  text-transform: none;
}

.page-about .about-hero__accent {
  color: var(--lime);
  display: inline-block;
  border-bottom: 3px solid var(--amber);
  padding-bottom: 4px;
}

.page-about .about-hero__lead {
  margin: 20px 0 0;
  max-width: 52ch;
  font-size: clamp(15px, 2.4vw, 17px);
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-hero__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-hero__tag {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 7px 12px;
  border: 2px solid var(--line-strong);
  background: rgba(14, 59, 46, 0.72);
  font-size: 13px;
  font-weight: 500;
  color: var(--paper);
}

.page-about .about-hero__tag .num {
  font-family: var(--font-mono);
  font-size: 17px;
  font-weight: 700;
  color: var(--lime);
}

.page-about .about-hero__media {
  position: relative;
}

.page-about .about-hero__figure {
  margin: 0;
  border: 2px solid var(--line-strong);
  box-shadow: var(--shadow-lift);
  background: var(--night);
  aspect-ratio: 4 / 3;
  overflow: hidden;
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.82) contrast(1.06);
}

.page-about .about-hero__card {
  position: absolute;
  left: 10px;
  bottom: -14px;
  display: grid;
  gap: 2px;
  padding: 12px 16px;
  background: var(--lime);
  color: var(--night);
  border: 2px solid var(--night);
  box-shadow: var(--shadow-hard);
}

.page-about .about-hero__card-label {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.16em;
}

.page-about .about-hero__card-num {
  font-family: var(--font-mono);
  font-size: clamp(34px, 6vw, 52px);
  font-weight: 700;
  line-height: 1;
}

.page-about .about-hero__card-note {
  font-size: 11px;
  font-weight: 500;
  color: rgba(4, 16, 13, 0.72);
}

.page-about .about-hero__stamp {
  position: absolute;
  top: 10px;
  right: 10px;
  writing-mode: vertical-rl;
  padding: 10px 6px;
  background: rgba(4, 16, 13, 0.78);
  border: 2px solid var(--amber);
  color: var(--amber);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
}

.page-about .about-shell {
  display: grid;
  gap: var(--about-gap);
  padding-bottom: clamp(40px, 6vw, 80px);
}

.page-about .about-index {
  border: 2px solid var(--line-strong);
  background: rgba(4, 16, 13, 0.55);
  padding: 16px 18px;
}

.page-about .about-index__title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--steel);
}

.page-about .about-index__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 14px;
}

.page-about .about-index__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 4px 0;
  color: var(--paper);
  font-size: 14px;
  font-weight: 500;
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: color 160ms ease, border-color 160ms ease;
}

.page-about .about-index__num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--lime);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--lime);
  border-bottom-color: var(--lime);
}

.page-about .about-index__note {
  margin: 12px 0 0;
  font-size: 12px;
  color: var(--steel);
}

.page-about .about-flow {
  display: grid;
  gap: var(--about-gap);
  min-width: 0;
}

.page-about .about-panel {
  position: relative;
  padding: var(--about-pad);
  background: var(--moss);
  border: 2px solid var(--line-strong);
  box-shadow: var(--shadow-hard);
}

.page-about .about-panel::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 56px;
  height: 6px;
  background: var(--lime);
}

.page-about .about-panel--team::before { background: var(--amber); }
.page-about .about-panel--upkeep::before { background: var(--clay); }
.page-about .about-panel--partners::before { background: var(--steel); }
.page-about .about-panel--why::before { background: var(--lime); }

.page-about .about-panel__head {
  max-width: 60ch;
  margin-bottom: clamp(20px, 3vw, 30px);
}

.page-about .about-panel__title {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 4.4vw, 40px);
  line-height: 1.15;
  color: var(--paper);
}

.page-about .about-panel__intro {
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}

/* 时间轴 */
.page-about .about-timeline {
  margin: 0;
  padding: 0 0 0 clamp(16px, 3vw, 26px);
  list-style: none;
  border-left: 2px solid var(--line-strong);
}

.page-about .about-timeline__item {
  position: relative;
  padding-bottom: 14px;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  top: 18px;
  left: calc(-1 * clamp(16px, 3vw, 26px) - 8px);
  width: 12px;
  height: 12px;
  background: var(--lime);
  border: 2px solid var(--night);
}

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

.page-about .about-stage {
  border: 2px solid var(--line);
  background: rgba(4, 16, 13, 0.4);
  transition: border-color 180ms ease;
}

.page-about .about-stage[open] {
  border-color: rgba(184, 255, 63, 0.55);
  background: rgba(7, 28, 22, 0.9);
}

.page-about .about-stage__summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 12px;
  padding: 13px 46px 13px 14px;
  cursor: pointer;
  position: relative;
  list-style: none;
}

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

.page-about .about-stage__summary::after {
  content: "+";
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 18px;
  color: var(--lime);
}

.page-about .about-stage[open] .about-stage__summary::after { content: "−"; }

.page-about .about-stage__phase {
  padding: 2px 8px;
  background: var(--lime);
  color: var(--night);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.1em;
}

.page-about .about-stage__name {
  font-size: 15px;
  font-weight: 600;
  color: var(--paper);
}

.page-about .about-stage__time {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--steel);
  letter-spacing: 0.06em;
}

.page-about .about-stage__body {
  padding: 0 16px 16px;
}

.page-about .about-stage__body p {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--muted);
}

/* 团队 */
.page-about .about-team__layout {
  display: grid;
  gap: clamp(18px, 3vw, 28px);
}

.page-about .about-team__figure {
  margin: 0;
  border: 2px solid var(--line-strong);
  background: var(--night);
  box-shadow: var(--shadow-hard);
}

.page-about .about-team__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  filter: saturate(0.85);
}

.page-about .about-team__caption {
  padding: 10px 14px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--steel);
  border-top: 2px solid var(--line);
}

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

.page-about .about-team-card {
  position: relative;
  padding: 16px 16px 14px;
  background: rgba(7, 28, 22, 0.75);
  border: 2px solid var(--line);
  border-left: 6px solid var(--amber);
  transition: transform 180ms ease, box-shadow 180ms ease, border-color 180ms ease;
}

.page-about .about-team-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-hard);
  border-left-color: var(--lime);
}

.page-about .about-team-card__index {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--steel);
}

.page-about .about-team-card__name {
  margin: 6px 0 0;
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 800;
  color: var(--paper);
}

.page-about .about-team-card__desc {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-team-card__more { margin-top: 10px; }

.page-about .about-team-card__more summary {
  cursor: pointer;
  list-style: none;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border: 2px solid var(--line-strong);
  font-size: 12px;
  font-weight: 600;
  color: var(--lime);
}

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

.page-about .about-team-card__more summary::after {
  content: "›";
  font-family: var(--font-mono);
  transition: transform 180ms ease;
}

.page-about .about-team-card__more[open] summary::after { transform: rotate(90deg); }

.page-about .about-team-card__list {
  margin: 12px 0 0;
  padding-left: 18px;
  display: grid;
  gap: 8px;
  font-size: 13px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-team-card__list li::marker { color: var(--amber); }

/* 维护流程 */
.page-about .about-steps {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 14px;
}

.page-about .about-step {
  position: relative;
  padding: 16px 16px 18px;
  background: var(--paper);
  color: var(--stone);
  border: 2px solid var(--stone);
  border-top: 8px solid var(--clay);
}

.page-about .about-step:nth-child(2) { border-top-color: var(--amber); }
.page-about .about-step:nth-child(3) { border-top-color: var(--lime); }
.page-about .about-step:nth-child(4) { border-top-color: var(--steel); }

.page-about .about-step__num {
  font-family: var(--font-mono);
  font-size: 24px;
  font-weight: 700;
  color: var(--stone);
  opacity: 0.55;
}

.page-about .about-step__title {
  margin: 4px 0 0;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 800;
  color: var(--stone);
}

.page-about .about-step__text {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: #3b4a46;
}

/* 合作生态 */
.page-about .about-collab { position: relative; }

.page-about .about-collab__radio {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  margin: 0;
  pointer-events: none;
}

.page-about .about-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 18px;
}

.page-about .about-filter__btn {
  display: inline-block;
  padding: 7px 14px;
  border: 2px solid var(--line-strong);
  background: transparent;
  color: var(--muted);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: background 160ms ease, color 160ms ease, border-color 160ms ease;
}

.page-about .about-filter__btn:hover { color: var(--lime); border-color: var(--lime); }

.page-about #pf-all:checked ~ .about-filter .about-filter__btn[for="pf-all"],
.page-about #pf-league:checked ~ .about-filter .about-filter__btn[for="pf-league"],
.page-about #pf-campus:checked ~ .about-filter .about-filter__btn[for="pf-campus"] {
  background: var(--lime);
  border-color: var(--lime);
  color: var(--night);
}

.page-about #pf-all:focus-visible ~ .about-filter .about-filter__btn[for="pf-all"],
.page-about #pf-league:focus-visible ~ .about-filter .about-filter__btn[for="pf-league"],
.page-about #pf-campus:focus-visible ~ .about-filter .about-filter__btn[for="pf-campus"] {
  outline: 2px solid var(--amber);
  outline-offset: 2px;
}

.page-about #pf-league:checked ~ .about-partners .about-partner:not(.is-league),
.page-about #pf-campus:checked ~ .about-partners .about-partner:not(.is-campus) {
  display: none;
}

.page-about .about-partners {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}

.page-about .about-partner {
  padding: 14px 16px;
  background: rgba(7, 28, 22, 0.78);
  border: 2px solid var(--line);
  border-bottom: 4px solid var(--clay);
}

.page-about .about-partner.is-campus { border-bottom-color: var(--steel); }

.page-about .about-partner__name {
  margin: 8px 0 0;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-partner__name .num {
  font-family: var(--font-mono);
  color: var(--amber);
}

.page-about .about-partner.is-campus .about-partner__name .num { color: var(--lime); }

.page-about .about-partner__text {
  margin: 6px 0 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-partners__foot {
  display: grid;
  gap: clamp(16px, 3vw, 28px);
  margin-top: clamp(20px, 3vw, 30px);
  padding-top: clamp(18px, 3vw, 26px);
  border-top: 2px solid var(--line);
}

.page-about .about-partners__figure {
  margin: 0;
  border: 2px solid var(--line-strong);
  background: var(--night);
  overflow: hidden;
}

.page-about .about-partners__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  filter: saturate(0.8) contrast(1.05);
}

.page-about .about-partners__ways-title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 800;
  color: var(--paper);
}

.page-about .about-partners__list {
  margin: 0 0 18px;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.page-about .about-partners__list li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-partners__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 8px;
  height: 8px;
  background: var(--amber);
}

/* 选择理由 */
.page-about .about-reasons {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0;
}

.page-about .about-reason {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 14px;
  padding: 18px 0;
  border-top: 2px solid var(--line);
}

.page-about .about-reason:last-child { border-bottom: 2px solid var(--line); }

.page-about .about-reason__num {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  color: var(--lime);
  padding-top: 4px;
}

.page-about .about-reason__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 800;
  color: var(--paper);
}

.page-about .about-reason p {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--muted);
}

/* CTA */
.page-about .about-cta {
  padding: clamp(24px, 4vw, 40px);
  background: var(--lime);
  color: var(--night);
  border: 2px solid var(--night);
  box-shadow: var(--shadow-lift);
}

.page-about .about-cta__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(26px, 4.6vw, 42px);
  font-weight: 800;
  line-height: 1.1;
  color: var(--night);
}

.page-about .about-cta__text {
  margin: 12px 0 0;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.8;
  color: #17301f;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

.page-about .about-cta__btn {
  display: inline-block;
  padding: 11px 20px;
  background: var(--night);
  color: var(--lime);
  border: 2px solid var(--night);
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
  transition: transform 160ms ease, background 160ms ease, color 160ms ease;
}

.page-about .about-cta__btn:hover,
.page-about .about-cta__btn:focus-visible {
  transform: translateY(-2px);
}

.page-about .about-cta__btn--ghost {
  background: transparent;
  color: var(--night);
}

.page-about .about-cta__btn--ghost:hover,
.page-about .about-cta__btn--ghost:focus-visible {
  background: var(--night);
  color: var(--lime);
}

.page-about .about-cta__btn:focus-visible {
  outline: 3px solid var(--clay);
  outline-offset: 2px;
}

@media (min-width: 640px) {
  .page-about .about-hero__card {
    left: -16px;
    bottom: -18px;
    padding: 14px 20px;
  }

  .page-about .about-hero__stamp {
    top: 14px;
    right: 14px;
  }

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

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

  .page-about .about-partners__foot {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: start;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.94fr);
  }

  .page-about .about-team__layout {
    grid-template-columns: minmax(0, 0.86fr) minmax(0, 1.14fr);
    align-items: start;
  }

  .page-about .about-team__figure {
    position: sticky;
    top: calc(var(--header-h) + 24px);
  }

  .page-about .about-index__list {
    flex-direction: column;
    gap: 10px;
  }

  .page-about .about-index__link {
    width: 100%;
    padding: 5px 0;
    font-size: 15px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-shell {
    grid-template-columns: 210px minmax(0, 1fr);
    gap: clamp(24px, 3vw, 40px);
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: calc(var(--header-h) + 20px);
    padding: 20px 20px 18px;
    border-left: 6px solid var(--lime);
    box-shadow: var(--shadow-hard);
    background: rgba(4, 16, 13, 0.85);
  }

  .page-about .about-index__title {
    font-size: 12px;
    margin-bottom: 14px;
    color: var(--amber);
  }

  .page-about .about-index__note {
    margin-top: 16px;
    padding-top: 12px;
    border-top: 2px solid var(--line);
  }

  .page-about .about-panel {
    padding: clamp(26px, 3vw, 42px);
  }

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