.page-about {
  background: var(--paper-050);
  color: var(--ink-900);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: clamp(20px, 4vw, 44px);
  padding-bottom: clamp(32px, 5vw, 64px);
}

.page-about .crumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: var(--fs-13);
  color: var(--gray-600);
  margin-bottom: clamp(20px, 3vw, 36px);
}

.page-about .crumb a {
  color: var(--cyan-700);
  text-decoration: none;
}

.page-about .crumb a:hover,
.page-about .crumb a:focus-visible {
  text-decoration: underline;
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(32px, 5.6vw, 64px);
  line-height: 1.08;
  letter-spacing: -0.01em;
  margin: 14px 0 18px;
  max-width: 14em;
  overflow-wrap: break-word;
}

.page-about .about-lede {
  font-size: var(--fs-17);
  line-height: 1.75;
  color: var(--ink-700);
  max-width: 34em;
  margin: 0 0 clamp(20px, 3vw, 28px);
}

.page-about .about-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-hero__visual {
  position: relative;
  background: var(--ink-900);
  border-radius: var(--r-card);
  padding: clamp(16px, 3vw, 30px);
  overflow: hidden;
}

.page-about .about-hero__visual::after {
  content: "";
  position: absolute;
  right: -40px;
  bottom: -60px;
  width: 180px;
  height: 180px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(0, 229, 192, 0.24), transparent 70%);
  pointer-events: none;
}

.page-about .about-hero__svg {
  display: block;
  width: 100%;
  height: auto;
  position: relative;
  z-index: 1;
}

.page-about .about-hero__caption {
  position: relative;
  z-index: 1;
  margin: 14px 0 0;
  font-family: var(--font-mono);
  font-size: var(--fs-13);
  letter-spacing: 0.04em;
  color: rgba(245, 247, 249, 0.6);
}

.page-about .about-tally {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(26px, 4vw, 44px);
  background: var(--hair-soft);
  border-top: 1px solid var(--hair-soft);
  border-bottom: 1px solid var(--hair-soft);
}

.page-about .about-tally__item {
  background: var(--paper-050);
  padding: 16px 12px;
  min-width: 0;
}

.page-about .about-tally__num {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--fs-24);
  font-weight: 700;
  line-height: 1.15;
  color: var(--ink-900);
}

.page-about .about-tally__label {
  display: block;
  margin-top: 6px;
  font-size: var(--fs-13);
  color: var(--gray-600);
}

/* ---------- 通用章节 ---------- */
.page-about .about-sec {
  padding-top: clamp(40px, 6vw, 84px);
  padding-bottom: clamp(40px, 6vw, 84px);
  border-top: 1px solid var(--hair-soft);
}

.page-about .about-sec__head {
  display: grid;
  gap: 10px;
  margin-bottom: clamp(22px, 4vw, 40px);
  max-width: 44em;
  min-width: 0;
}

.page-about .about-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(28px, 4.6vw, 44px);
  line-height: 1;
  font-weight: 700;
  color: var(--orange-700);
}

@supports (-webkit-text-stroke: 1px red) {
  .page-about .about-num {
    color: transparent;
    -webkit-text-stroke: 1.5px var(--orange-500);
  }
}

.page-about .about-sec__head h2 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(23px, 3.2vw, 32px);
  line-height: 1.22;
  margin: 0;
  overflow-wrap: break-word;
}

.page-about .about-sec__lead {
  margin: 0;
  font-size: var(--fs-17);
  line-height: 1.75;
  color: var(--ink-700);
  max-width: 36em;
}

.page-about .about-sec p {
  font-size: var(--fs-15);
  line-height: 1.8;
  color: var(--ink-700);
  max-width: 38em;
}

.page-about .mono {
  font-family: var(--font-mono);
  font-size: var(--fs-15);
  color: var(--ink-900);
}

/* ---------- 02 时间线 ---------- */
.page-about .about-hist {
  display: grid;
  gap: clamp(22px, 4vw, 48px);
}

.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  min-width: 0;
}

.page-about .timeline__item {
  position: relative;
  padding-left: 30px;
  padding-bottom: 6px;
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 14px;
  bottom: -6px;
  width: 1px;
  background: var(--hair);
}

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

.page-about .timeline__item::after {
  content: "";
  position: absolute;
  left: 3px;
  top: 16px;
  width: 11px;
  height: 11px;
  box-sizing: border-box;
  border-radius: 50%;
  background: var(--paper-050);
  border: 2px solid var(--cyan-400);
}

.page-about .timeline__stop summary {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 4px 10px;
  align-items: center;
  padding: 10px 12px;
  border-radius: 12px;
  cursor: pointer;
  list-style: none;
  transition: background 0.16s var(--ease);
}

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

.page-about .timeline__stop summary:hover,
.page-about .timeline__stop summary:focus-visible {
  background: var(--paper-100);
}

.page-about .timeline__year {
  grid-column: 1;
  font-family: var(--font-mono);
  font-size: var(--fs-13);
  letter-spacing: 0.06em;
  color: var(--orange-700);
}

.page-about .timeline__title {
  grid-column: 1;
  grid-row: 2;
  font-size: var(--fs-17);
  font-weight: 700;
  line-height: 1.45;
  color: var(--ink-900);
}

.page-about .timeline__toggle {
  grid-column: 2;
  grid-row: 1 / span 2;
  position: relative;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  border: 1px solid var(--hair);
  flex: none;
}

.page-about .timeline__toggle::before,
.page-about .timeline__toggle::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 10px;
  height: 1px;
  background: var(--cyan-700);
  transform: translate(-50%, -50%);
  transition: transform 0.16s var(--ease);
}

.page-about .timeline__toggle::after {
  transform: translate(-50%, -50%) rotate(90deg);
}

.page-about .timeline__stop[open] .timeline__toggle::after {
  transform: translate(-50%, -50%) rotate(0deg);
}

.page-about .timeline__body {
  padding: 2px 12px 14px;
}

.page-about .timeline__body p {
  margin: 0;
  font-size: var(--fs-15);
  line-height: 1.8;
  color: var(--ink-700);
}

/* ---------- 03 场馆网络 ---------- */
.page-about .about-net {
  background: var(--ink-900);
  color: var(--paper-050);
  padding-top: clamp(40px, 6vw, 84px);
  padding-bottom: clamp(40px, 6vw, 84px);
}

.page-about .about-net .about-num {
  color: transparent;
  -webkit-text-stroke: 1.5px var(--cyan-400);
}

.page-about .about-net .about-sec__head h2 {
  color: var(--paper-050);
}

.page-about .about-net .about-sec__lead {
  color: rgba(245, 247, 249, 0.78);
}

.page-about .about-net__layout {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  min-width: 0;
}

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

.page-about .net-map {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(72px, 1fr));
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: rgba(245, 247, 249, 0.14);
  border: 1px solid rgba(245, 247, 249, 0.14);
}

.page-about .net-cell {
  background: var(--ink-900);
  padding: 12px 4px 10px;
  text-align: center;
  font-family: var(--font-mono);
  font-size: var(--fs-13);
  color: rgba(245, 247, 249, 0.76);
  transition: background 0.16s var(--ease), color 0.16s var(--ease);
}

.page-about .net-cell::before {
  content: "";
  display: block;
  width: 6px;
  height: 6px;
  margin: 0 auto 7px;
  border-radius: 50%;
  background: var(--cyan-400);
}

.page-about .net-cell:hover,
.page-about .net-cell:focus-visible {
  background: var(--ink-700);
  color: var(--paper-050);
  outline: 2px solid var(--cyan-400);
  outline-offset: -2px;
}

.page-about .about-net__note {
  margin: 14px 0 0;
  font-size: var(--fs-13);
  line-height: 1.7;
  color: rgba(245, 247, 249, 0.6);
}

.page-about .about-net__sub {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: var(--fs-19);
  line-height: 1.4;
  margin: 0 0 10px;
  color: var(--paper-050);
}

.page-about .about-net__text p {
  margin: 0 0 22px;
  font-size: var(--fs-15);
  line-height: 1.8;
  color: rgba(245, 247, 249, 0.82);
  max-width: 34em;
}

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

.page-about .about-net__figure img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 14px;
  object-fit: cover;
  background: var(--ink-700);
}

.page-about .about-net__figure figcaption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: var(--fs-13);
  line-height: 1.6;
  color: rgba(245, 247, 249, 0.6);
}

/* ---------- 04 身份表 ---------- */
.page-about .roles {
  width: 100%;
  border-collapse: collapse;
  min-width: 0;
}

.page-about .roles caption {
  text-align: left;
  font-size: var(--fs-13);
  letter-spacing: 0.08em;
  color: var(--gray-600);
  padding-bottom: 12px;
}

.page-about .roles th[scope="col"] {
  text-align: left;
  font-family: var(--font-ui);
  font-weight: 700;
  font-size: var(--fs-13);
  letter-spacing: 0.08em;
  color: var(--gray-600);
  padding: 10px 10px;
  border-bottom: 1px solid var(--hair);
}

.page-about .roles th[scope="row"] {
  text-align: left;
  font-weight: 700;
  font-size: var(--fs-15);
  color: var(--ink-900);
  padding: 16px 10px;
  border-bottom: 1px solid var(--hair-soft);
  vertical-align: top;
  white-space: nowrap;
}

.page-about .roles td {
  padding: 16px 10px;
  border-bottom: 1px solid var(--hair-soft);
  vertical-align: top;
  font-size: var(--fs-15);
  line-height: 1.75;
  color: var(--ink-700);
}

.page-about .about-roles__more {
  margin: 22px 0 0;
  font-size: var(--fs-15);
  line-height: 1.8;
  color: var(--gray-600);
  max-width: 42em;
}

.page-about .about-roles__more a {
  color: var(--cyan-700);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 05 / 06 双栏 ---------- */
.page-about .about-duo {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
  align-items: start;
  min-width: 0;
}

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

.page-about .about-duo__media {
  margin: 0;
  min-width: 0;
}

.page-about .about-duo__media img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: var(--r-card);
  object-fit: cover;
  background: var(--paper-100);
}

.page-about .about-duo__media figcaption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: var(--fs-13);
  line-height: 1.6;
  color: var(--gray-600);
}

.page-about .about-duo__link {
  margin-top: 8px;
}

.page-about .about-duo__link a {
  font-size: var(--fs-15);
  font-weight: 700;
  color: var(--cyan-700);
  text-decoration: none;
  border-bottom: 2px solid var(--cyan-400);
  padding-bottom: 2px;
}

.page-about .about-duo__link a:hover {
  color: var(--ink-900);
}

/* ---------- 06 运行保障列表 ---------- */
.page-about .ops-list {
  margin: 0;
  padding: 0;
}

.page-about .ops-list__row {
  display: grid;
  gap: 4px;
  padding: 16px 0;
  border-top: 1px solid var(--hair-soft);
}

.page-about .ops-list__row:last-child {
  border-bottom: 1px solid var(--hair-soft);
}

.page-about .ops-list dt {
  font-family: var(--font-mono);
  font-size: var(--fs-13);
  letter-spacing: 0.08em;
  color: var(--orange-700);
}

.page-about .ops-list dd {
  margin: 0;
  font-size: var(--fs-15);
  line-height: 1.8;
  color: var(--ink-700);
  max-width: 34em;
}

/* ---------- 07 区域服务 ---------- */
.page-about .service-grid {
  display: grid;
  gap: 1px;
  background: var(--hair-soft);
  border: 1px solid var(--hair-soft);
}

.page-about .service-card {
  background: var(--paper-050);
  padding: clamp(18px, 3vw, 26px);
  min-width: 0;
}

.page-about .service-card h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: var(--fs-19);
  line-height: 1.4;
}

.page-about .service-card p {
  margin: 0;
  font-size: var(--fs-15);
  line-height: 1.8;
  color: var(--ink-700);
}

.page-about .service-card--accent {
  background: var(--ink-900);
}

.page-about .service-card--accent h3 {
  color: var(--paper-050);
}

.page-about .service-card--accent p {
  color: rgba(245, 247, 249, 0.82);
}

.page-about .service-card--accent a {
  color: var(--cyan-400);
  text-decoration: underline;
  text-underline-offset: 3px;
  word-break: break-all;
}

.page-about .service-card--accent .mono {
  color: var(--paper-050);
  font-family: var(--font-mono);
}

.page-about .service-card__line + .service-card__line {
  margin-top: 8px;
}

/* ---------- 08 下一站 ---------- */
.page-about .about-next .about-sec__head {
  margin-bottom: clamp(6px, 2vw, 16px);
}

.page-about .next-list {
  display: grid;
  min-width: 0;
}

.page-about .next-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 4px;
  border-top: 1px solid var(--hair-soft);
  text-decoration: none;
  color: var(--ink-900);
  transition: padding-left 0.18s var(--ease), color 0.18s var(--ease);
}

.page-about .next-link:last-child {
  border-bottom: 1px solid var(--hair-soft);
}

.page-about .next-link:hover,
.page-about .next-link:focus-visible {
  padding-left: 12px;
  color: var(--cyan-700);
}

.page-about .next-link__name {
  font-size: var(--fs-17);
  font-weight: 700;
  line-height: 1.5;
  min-width: 0;
}

.page-about .next-link__arrow {
  flex: none;
  font-family: var(--font-mono);
  font-size: var(--fs-19);
  color: var(--orange-500);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-tally {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .service-card--accent {
    grid-column: 1 / -1;
  }
}

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

  .page-about .about-duo {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }

  .page-about .about-duo--flip > .about-duo__text {
    order: 2;
  }

  .page-about .about-duo--flip > .about-duo__media {
    order: 1;
  }

  .page-about .about-net__layout {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
  }

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

  .page-about .service-card--accent {
    grid-column: auto;
  }
}

@media (min-width: 1000px) {
  .page-about .about-hist {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
  }

  .page-about .about-hist .about-sec__head {
    position: sticky;
    top: 96px;
    margin-bottom: 0;
  }
}

@media (max-width: 479px) {
  .page-about .roles th[scope="row"] {
    white-space: normal;
    width: 30%;
  }

  .page-about .net-map {
    grid-template-columns: repeat(auto-fill, minmax(62px, 1fr));
  }

  .page-about .net-cell {
    font-size: 12px;
    padding: 10px 2px 8px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .timeline__toggle::before,
  .page-about .timeline__toggle::after,
  .page-about .timeline__stop summary,
  .page-about .net-cell,
  .page-about .next-link {
    transition: none;
  }
}
<<<END>>>