.page-about {
  --about-rail-w: 200px;
  --about-gap: clamp(1.75rem, 4vw, 3.5rem);
  --about-pad: clamp(3rem, 8vw, 7rem);
  --about-node-idx: 3.2rem;
  background: var(--snow);
  color: var(--ink);
  font-family: var(--font-sans);
}

.page-about a {
  color: var(--sky);
}

.page-about .breadcrumb {
  padding-top: clamp(1rem, 3vw, 1.75rem);
}

/* ---------- 首屏：展册跨页 ---------- */
.page-about .about-hero {
  padding: clamp(1.25rem, 4vw, 2.5rem) 0 clamp(1.5rem, 4vw, 2.75rem);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.5rem);
}

.page-about .about-hero__eyebrow {
  margin: 0;
  font-size: var(--fs-note);
  font-weight: 700;
  letter-spacing: 0.2em;
  color: var(--grey);
}

.page-about .about-hero__title {
  margin: 0.55rem 0 0;
  font-size: clamp(34px, 7.4vw, 68px);
  font-weight: 900;
  line-height: 1.04;
  letter-spacing: -0.02em;
}

.page-about .about-hero__lede {
  max-width: 46ch;
  margin: 1.15rem 0 0;
  color: var(--grey);
}

.page-about .about-hero__aside {
  padding-top: 1.25rem;
  border-top: 1px solid var(--line);
}

.page-about .about-hero__big {
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
  margin: 0 0 1.1rem;
  flex-wrap: wrap;
}

.page-about .about-hero__bignum {
  font-size: clamp(60px, 15vw, 108px);
  font-weight: 900;
  line-height: 0.8;
  letter-spacing: -0.04em;
  color: var(--sky);
}

.page-about .about-hero__bigunit {
  font-size: var(--fs-note);
  font-weight: 700;
  color: var(--grey);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.9rem 1rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-hero__stats li {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  padding-top: 0.7rem;
  border-top: 1px solid var(--line);
}

.page-about .about-hero__statnum {
  font-size: 1.3rem;
  font-weight: 900;
  letter-spacing: -0.01em;
}

.page-about .about-hero__statlabel {
  font-size: var(--fs-note);
  color: var(--grey);
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 310px);
    gap: clamp(2rem, 6vw, 5rem);
    align-items: end;
  }

  .page-about .about-hero__aside {
    padding-top: 0;
    padding-left: 1.6rem;
    border-top: 0;
    border-left: 1px solid var(--line);
  }
}

/* ---------- 通栏全景图 ---------- */
.page-about .about-pano {
  margin: 0 0 clamp(2rem, 6vw, 4.5rem);
}

.page-about .about-pano img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: var(--radius);
}

.page-about .about-pano__caption,
.page-about .about-media__caption {
  margin-top: 0.7rem;
  padding-left: 0.65rem;
  border-left: 2px solid var(--flag-blue);
  font-size: var(--fs-note);
  line-height: 1.65;
  color: var(--grey);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-chapter {
  padding: var(--about-pad) 0;
}

.page-about .about-chapter--band {
  background: var(--paper);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-chapter__head {
  display: grid;
  gap: 0.6rem;
  margin-bottom: clamp(1.75rem, 4vw, 3rem);
  max-width: 70ch;
}

.page-about .about-chapter__num {
  margin: 0;
  font-size: var(--fs-note);
  font-weight: 700;
  letter-spacing: 0.18em;
  color: var(--sky);
}

.page-about .about-chapter__title {
  margin: 0;
  font-size: clamp(24px, 4.2vw, 40px);
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -0.02em;
}

.page-about .about-chapter__note {
  margin: 0;
  font-size: var(--fs-body);
  line-height: 1.75;
  color: var(--grey);
}

/* ---------- 赛季刻度轴线 ---------- */
.page-about .about-axis {
  display: grid;
  gap: clamp(1.25rem, 3vw, 2rem);
}

.page-about .about-rail {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem 1rem;
  padding-left: 1rem;
  border-left: 3px solid var(--flag-yellow);
}

.page-about .about-rail__eyebrow {
  margin: 0;
  font-size: var(--fs-note);
  font-weight: 700;
  letter-spacing: 0.22em;
  color: var(--grey);
}

.page-about .about-rail__num {
  font-size: clamp(52px, 12vw, 88px);
  font-weight: 900;
  line-height: 0.82;
  letter-spacing: -0.05em;
  color: var(--indigo);
}

.page-about .about-rail__cap {
  margin: 0;
  font-size: var(--fs-note);
  color: var(--grey);
}

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

.page-about .about-nodes {
  display: grid;
}

.page-about .about-node {
  border-top: 1px solid var(--line);
}

.page-about .about-node:last-child {
  border-bottom: 1px solid var(--line);
}

.page-about .about-node__head {
  display: grid;
  grid-template-columns: var(--about-node-idx) minmax(0, 1fr) 1.25rem;
  align-items: center;
  gap: 0.5rem;
  padding: 1rem 0.15rem;
  cursor: pointer;
  list-style: none;
  transition: background-color 0.2s ease;
}

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

.page-about .about-node__head::marker {
  content: "";
}

.page-about .about-node__head:hover {
  background: rgba(27, 111, 168, 0.06);
}

.page-about .about-node__head:focus-visible {
  outline: 2px solid var(--sky);
  outline-offset: -2px;
}

.page-about .about-node__idx {
  font-size: 1.15rem;
  font-weight: 900;
  color: var(--grey);
  transition: color 0.2s ease;
}

.page-about .about-node[open] .about-node__idx {
  color: var(--sky);
}

.page-about .about-node__label {
  font-size: clamp(1rem, 2.4vw, 1.25rem);
  font-weight: 900;
  letter-spacing: -0.01em;
}

.page-about .about-node__marker {
  justify-self: end;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--flag-blue);
  transition: box-shadow 0.2s ease;
}

.page-about .about-node[open] .about-node__marker {
  box-shadow: 0 0 0 4px rgba(46, 155, 224, 0.18);
}

.page-about .about-node:nth-child(1) .about-node__marker { background: var(--flag-blue); }
.page-about .about-node:nth-child(2) .about-node__marker { background: var(--flag-green); }
.page-about .about-node:nth-child(3) .about-node__marker { background: var(--flag-yellow); }
.page-about .about-node:nth-child(4) .about-node__marker { background: var(--flag-red); }
.page-about .about-node:nth-child(5) .about-node__marker { background: var(--violet); }

.page-about .about-node__body {
  padding: 0 0.15rem 1.5rem calc(var(--about-node-idx) + 0.5rem);
}

.page-about .about-node__body p {
  margin: 0;
  max-width: 62ch;
  font-size: var(--fs-body);
  line-height: 1.75;
  color: var(--grey);
}

@media (min-width: 960px) {
  .page-about .about-axis {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: var(--about-gap);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 108px;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
    padding: 0 0 0 1.25rem;
  }

  .page-about .about-rail__svg {
    display: block;
    margin-top: 1rem;
    height: auto;
  }

  .page-about .about-node__head {
    padding: 1.2rem 0.5rem;
  }

  .page-about .about-node__body {
    padding: 0 0.5rem 1.9rem calc(var(--about-node-idx) + 0.5rem);
  }
}

/* ---------- 三类内容卡片（错落） ---------- */
.page-about .about-cards {
  display: grid;
  gap: 1rem;
}

.page-about .about-card {
  position: relative;
  padding: 1.5rem 1.35rem 1.4rem;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-soft);
  transition: transform 0.24s ease, box-shadow 0.24s ease;
}

.page-about .about-card::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 3px;
  border-radius: var(--radius) 0 0 var(--radius);
  background: var(--flag-blue);
}

.page-about .about-card--violet::before { background: var(--violet); }
.page-about .about-card--wine::before { background: var(--wine); }

.page-about .about-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lift);
}

.page-about .about-card__idx {
  margin: 0;
  font-size: var(--fs-note);
  font-weight: 900;
  letter-spacing: 0.18em;
  color: var(--grey);
}

.page-about .about-card__title {
  margin: 0.4rem 0 0.7rem;
  font-size: clamp(1.15rem, 2.6vw, 1.45rem);
  font-weight: 900;
  letter-spacing: -0.01em;
}

.page-about .about-card__text {
  margin: 0;
  font-size: var(--fs-body);
  line-height: 1.75;
  color: var(--grey);
}

.page-about .about-card__link {
  margin: 1rem 0 0;
  font-size: var(--fs-note);
  font-weight: 700;
}

@media (min-width: 860px) {
  .page-about .about-cards {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: 1.25rem;
  }

  .page-about .about-card:nth-child(1) {
    grid-column: 1 / 7;
  }

  .page-about .about-card:nth-child(2) {
    grid-column: 7 / 13;
    margin-top: 3rem;
  }

  .page-about .about-card:nth-child(3) {
    grid-column: 3 / 11;
    margin-top: 1.25rem;
  }
}

/* ---------- 团队 / 流程 标签页 ---------- */
.page-about .about-team {
  display: grid;
  gap: clamp(1.75rem, 4vw, 2.75rem);
}

.page-about .tablist {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem;
  margin-bottom: clamp(1.25rem, 3vw, 2rem);
  border-bottom: 1px solid var(--line);
}

.page-about .tab {
  appearance: none;
  padding: 0.7rem 0.95rem;
  border: 0;
  border-bottom: 2px solid transparent;
  background: none;
  font-family: inherit;
  font-size: 0.98rem;
  font-weight: 700;
  color: var(--grey);
  cursor: pointer;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.page-about .tab:hover {
  color: var(--ink);
}

.page-about .tab[aria-selected="true"] {
  color: var(--ink);
  border-bottom-color: var(--flag-yellow);
}

.page-about .tab:focus-visible {
  outline: 2px solid var(--sky);
  outline-offset: 2px;
}

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

.page-about .about-role {
  display: grid;
  grid-template-columns: 3.4rem minmax(0, 1fr);
  gap: 0.9rem;
  padding: 1rem 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-role:first-child {
  border-top: 1px solid var(--line);
}

.page-about .about-role__num {
  font-size: 1.5rem;
  font-weight: 900;
  line-height: 1.1;
  color: var(--wine);
}

.page-about .about-role__name {
  margin: 0 0 0.35rem;
  font-size: 1.05rem;
  font-weight: 900;
}

.page-about .about-role__desc {
  margin: 0;
  font-size: 0.98rem;
  line-height: 1.75;
  color: var(--grey);
}

.page-about .about-flow {
  display: grid;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: about-flow;
}

.page-about .about-flow__item {
  display: grid;
  grid-template-columns: 3.4rem minmax(0, 1fr);
  gap: 0.9rem;
  padding: 1rem 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-flow__item:first-child {
  border-top: 1px solid var(--line);
}

.page-about .about-flow__step {
  font-size: 1.5rem;
  font-weight: 900;
  line-height: 1.1;
  color: var(--sky);
}

.page-about .about-flow__title {
  margin: 0 0 0.35rem;
  font-size: 1.05rem;
  font-weight: 900;
}

.page-about .about-flow__text {
  margin: 0;
  font-size: 0.98rem;
  line-height: 1.75;
  color: var(--grey);
}

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

.page-about .about-media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border-radius: var(--radius);
}

@media (min-width: 900px) {
  .page-about .about-team {
    grid-template-columns: minmax(0, 1fr) minmax(0, 340px);
    align-items: start;
  }

  .page-about .about-team .about-media {
    margin-top: 3.2rem;
  }
}

/* ---------- 覆盖与项目 ---------- */
.page-about .about-cover {
  display: grid;
  gap: clamp(1.75rem, 4vw, 2.5rem);
}

.page-about .about-disciplines {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(128px, 1fr));
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-disciplines li {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.85rem 0.9rem;
  background: var(--paper);
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--ink);
  transition: background-color 0.2s ease, color 0.2s ease;
}

.page-about .about-disciplines li::before {
  content: "";
  flex: none;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--sky);
  transition: background-color 0.2s ease;
}

.page-about .about-disciplines li:hover {
  background: var(--sky);
  color: var(--paper);
}

.page-about .about-disciplines li:hover::before {
  background: var(--flag-yellow);
}

.page-about .about-cover__notes {
  display: grid;
  gap: 1.25rem;
}

.page-about .about-cover__note {
  padding-top: 1rem;
  border-top: 2px solid var(--violet);
}

.page-about .about-cover__note-title {
  margin: 0 0 0.5rem;
  font-size: 1.08rem;
  font-weight: 900;
}

.page-about .about-cover__note p {
  margin: 0;
  font-size: var(--fs-body);
  line-height: 1.75;
  color: var(--grey);
}

@media (min-width: 900px) {
  .page-about .about-cover {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(2rem, 5vw, 3.5rem);
    align-items: start;
  }

  .page-about .about-cover__notes {
    gap: 1.75rem;
  }
}

/* ---------- 合作生态 ---------- */
.page-about .about-coop {
  display: grid;
  gap: clamp(1.75rem, 4vw, 3rem);
}

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

.page-about .about-coop__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border-radius: var(--radius);
}

.page-about .about-chapter__head .about-chapter__note a,
.page-about .about-faq__a a {
  font-weight: 700;
}

.page-about .about-faq {
  display: grid;
  gap: 0;
  margin-top: 0.5rem;
}

.page-about .about-faq__item {
  border-top: 1px solid var(--line);
}

.page-about .about-faq__item:last-child {
  border-bottom: 1px solid var(--line);
}

.page-about .about-faq__summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.5rem 0.9rem;
  padding: 1rem 0.15rem;
  cursor: pointer;
  list-style: none;
  transition: background-color 0.2s ease;
}

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

.page-about .about-faq__summary::marker {
  content: "";
}

.page-about .about-faq__summary:hover {
  background: rgba(122, 46, 58, 0.06);
}

.page-about .about-faq__summary:focus-visible {
  outline: 2px solid var(--sky);
  outline-offset: -2px;
}

.page-about .about-faq__q {
  font-size: 1.05rem;
  font-weight: 900;
}

.page-about .about-faq__hint {
  font-size: var(--fs-note);
  color: var(--grey);
}

.page-about .about-faq__a {
  padding: 0 0.15rem 1.4rem;
}

.page-about .about-faq__a p {
  margin: 0 0 0.7rem;
  max-width: 64ch;
  font-size: 0.98rem;
  line-height: 1.75;
  color: var(--grey);
}

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

@media (min-width: 900px) {
  .page-about .about-coop {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
  }

  .page-about .about-coop__figure {
    position: sticky;
    top: 108px;
  }
}

/* ---------- 资质与备案 ---------- */
.page-about .about-legal {
  display: grid;
  gap: 0;
  margin: 0;
  border-top: 1px solid var(--line-strong);
}

.page-about .about-legal__row {
  display: grid;
  gap: 0.35rem;
  padding: 1rem 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-legal__key {
  font-size: var(--fs-note);
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--grey);
}

.page-about .about-legal__val {
  margin: 0;
  font-size: var(--fs-body);
  line-height: 1.7;
  color: var(--ink);
}

@media (min-width: 760px) {
  .page-about .about-legal__row {
    grid-template-columns: 200px minmax(0, 1fr);
    gap: 1.5rem;
    align-items: baseline;
  }
}

/* ---------- 收尾深色条 ---------- */
.page-about .about-closing {
  background: var(--indigo);
  color: var(--paper);
}

.page-about .about-closing__inner {
  display: grid;
  gap: 1.5rem;
  padding: clamp(2.5rem, 7vw, 5rem) 0;
}

.page-about .about-closing__eyebrow {
  margin: 0;
  font-size: var(--fs-note);
  font-weight: 700;
  letter-spacing: 0.22em;
  color: var(--flag-yellow);
}

.page-about .about-closing__title {
  margin: 0.55rem 0 0.8rem;
  font-size: clamp(24px, 4.4vw, 40px);
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-closing__text {
  margin: 0;
  max-width: 56ch;
  font-size: var(--fs-body);
  line-height: 1.75;
  color: rgba(247, 250, 252, 0.78);
}

.page-about .about-closing__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

@media (min-width: 860px) {
  .page-about .about-closing__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
    gap: 2.5rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-card,
  .page-about .about-node__head,
  .page-about .about-node__marker,
  .page-about .about-disciplines li,
  .page-about .about-faq__summary,
  .page-about .tab {
    transition: none;
  }

  .page-about .about-card:hover {
    transform: none;
  }
}
</PAGE_CSS>>>