.page-about {
  --about-rail-w: 236px;
  --about-gap: 48px;
  padding: 18px 0 112px;
  background: var(--ink);
  color: var(--white);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.75;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  padding: 6px 0 22px;
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--mist);
}
.page-about .breadcrumb a {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .18s, border-color .18s;
}
.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--neon);
  border-bottom-color: var(--neon);
}

/* ---------- 骨架 ---------- */
.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
}
.page-about .about-flow {
  min-width: 0;
}

/* ---------- 左侧赛季进程 ---------- */
.page-about .about-rail__title {
  margin: 0 0 12px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--mist);
}
.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.page-about .rail-node {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 11px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--ink-2);
  font-family: var(--mono);
  font-size: 11px;
  color: var(--mist);
  transition: border-color .18s, color .18s;
}
.page-about .rail-node__dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--neon);
  flex: none;
}
.page-about .rail-node__label {
  white-space: nowrap;
}
.page-about .rail-node__meta {
  display: none;
}
.page-about .rail-node:hover,
.page-about .rail-node:focus-within {
  border-color: var(--neon);
  color: var(--white);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-left: 18px;
  border-left: 2px solid var(--neon);
  margin-bottom: 88px;
}
.page-about .about-hero .eyebrow {
  margin: 0;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--neon);
}
.page-about .about-hero h1 {
  margin: 10px 0 18px;
  font-size: clamp(30px, 7vw, 58px);
  font-weight: 900;
  line-height: 1.06;
  letter-spacing: -.02em;
  max-width: 15em;
}
.page-about .about-hero__lead {
  margin: 0 0 30px;
  max-width: 44em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--white);
}
.page-about .about-hero__facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px;
  background: var(--line);
  border: 2px solid var(--line-strong);
}
.page-about .fact {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 14px 16px;
  background: var(--ink-2);
}
.page-about .fact__num {
  font-family: var(--mono);
  font-size: clamp(26px, 6vw, 36px);
  font-weight: 700;
  line-height: 1;
  color: var(--neon);
  font-variant-numeric: tabular-nums;
}
.page-about .fact__unit {
  font-size: .5em;
  margin-left: 2px;
  color: var(--mist);
}
.page-about .fact__label {
  font-size: 12px;
  line-height: 1.5;
  color: var(--mist);
  letter-spacing: .03em;
}

/* ---------- 章节通用 ---------- */
.page-about .about-section {
  margin-bottom: 96px;
  scroll-margin-top: 96px;
}
.page-about .about-section:last-child {
  margin-bottom: 0;
}
.page-about .about-kicker {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--neon);
}
.page-about .about-kicker::before {
  content: "";
  width: 22px;
  height: 2px;
  background: var(--neon);
  flex: none;
}
.page-about .about-section h2 {
  margin: 12px 0 14px;
  font-size: clamp(23px, 4.6vw, 40px);
  font-weight: 800;
  line-height: 1.22;
  letter-spacing: -.01em;
  max-width: 20em;
}
.page-about .about-section__intro {
  margin: 0;
  max-width: 42em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--mist);
}
.page-about .section-head {
  margin-bottom: 32px;
}

/* ---------- 三条业务线 ---------- */
.page-about .line-list {
  display: grid;
  gap: 18px;
}
.page-about .line-item {
  position: relative;
  padding: 22px 20px 22px 26px;
  border: 2px solid var(--line);
  background: var(--ink-2);
  box-shadow: var(--shadow-hard);
  transition: transform .18s, border-color .18s;
}
.page-about .line-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 6px;
}
.page-about .line-item--data::before { background: var(--neon); }
.page-about .line-item--study::before { background: var(--amber); }
.page-about .line-item--clip::before { background: var(--electric); }
.page-about .line-item:hover,
.page-about .line-item:focus-within {
  transform: translate(-2px, -3px);
  border-color: var(--neon);
}
.page-about .line-item__top {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 12px;
}
.page-about .line-item__idx {
  font-family: var(--mono);
  font-size: 28px;
  font-weight: 700;
  line-height: 1;
  color: var(--line-strong);
}
.page-about .line-item__title {
  margin: 0;
  font-size: 20px;
  font-weight: 800;
}
.page-about .line-item__facts {
  margin: 0 0 14px;
  display: grid;
  gap: 6px;
}
.page-about .line-item__facts > div {
  display: flex;
  gap: 10px;
  align-items: flex-start;
}
.page-about .line-item__facts dt {
  flex: none;
  width: 66px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--mist);
  padding-top: 4px;
}
.page-about .line-item__facts dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--white);
}
.page-about .line-item__text {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--mist);
}
.page-about .line-item__link {
  display: inline-block;
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--neon);
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 243, 208, .4);
  transition: border-color .18s, transform .18s;
}
.page-about .line-item__link:hover,
.page-about .line-item__link:focus-visible {
  border-bottom-color: var(--neon);
  transform: translateX(2px);
}

/* ---------- 图片容器基础 ---------- */
.page-about .media-frame img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .about-history__media {
  margin: 0 0 42px;
}
.page-about .about-team__media {
  margin: 0;
}

/* ---------- 发展历程 ---------- */
.page-about .season-track {
  list-style: none;
  margin: 0;
  padding: 4px 0 4px 26px;
  position: relative;
}
.page-about .season-track::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(var(--line-strong), var(--neon));
}
.page-about .season-item {
  position: relative;
  padding-bottom: 6px;
}
.page-about .season-item::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 12px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--line-strong);
  transition: background .18s, border-color .18s, box-shadow .18s;
}
.page-about .season-item:hover::before,
.page-about .season-item:focus-within::before {
  background: var(--neon);
  border-color: var(--neon);
  box-shadow: var(--glow-neon);
}
.page-about .season-item summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  padding: 6px 0 14px;
  cursor: pointer;
  list-style: none;
  font-size: 17px;
  font-weight: 700;
  color: var(--white);
  transition: color .18s;
}
.page-about .season-item summary::-webkit-details-marker {
  display: none;
}
.page-about .season-item summary:hover {
  color: var(--neon);
}
.page-about .season-item__tag {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--amber);
}
.page-about .season-item__name {
  flex: 1 1 auto;
  min-width: 0;
}
.page-about .season-item__hint {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--mist);
  border: 1px solid var(--line);
  padding: 1px 7px;
}
.page-about .season-item__hint::after {
  content: "展开";
}
.page-about .season-item details[open] .season-item__hint::after {
  content: "收起";
}
.page-about .season-item p {
  margin: 0 0 20px;
  max-width: 44em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--mist);
}

/* ---------- 团队构成 ---------- */
.page-about .team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
  margin-bottom: 42px;
}
.page-about .team-bar {
  display: flex;
  height: 62px;
  margin-bottom: 44px;
  border: 2px solid var(--line-strong);
  background: var(--ink-2);
}
.page-about .team-bar__seg {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--mono);
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
  transition: filter .18s;
}
.page-about .team-bar__seg + .team-bar__seg {
  border-left: 2px solid var(--ink);
}
.page-about .team-bar__seg--edit { flex: 18 1 0; background: var(--neon); }
.page-about .team-bar__seg--build { flex: 9 1 0; background: var(--electric); color: var(--white); }
.page-about .team-bar__seg--ops { flex: 8 1 0; background: var(--amber); }
.page-about .team-bar__seg--support { flex: 7 1 0; background: var(--pitch); }
.page-about .team-bar__seg:hover {
  filter: brightness(1.15);
}
.page-about .team-bar__seg::after {
  content: attr(data-role);
  position: absolute;
  left: 50%;
  bottom: -34px;
  transform: translateX(-50%);
  padding: 4px 9px;
  background: var(--ink-deep);
  border: 1px solid var(--neon);
  color: var(--white);
  font-family: var(--sans);
  font-size: 12px;
  font-weight: 400;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity .18s;
}
.page-about .team-bar__seg:hover::after,
.page-about .team-bar__seg:focus-within::after {
  opacity: 1;
}
.page-about .team-chart__note {
  margin: 0;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--mist);
}
.page-about .team-roles {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2px;
  background: var(--line);
  border: 2px solid var(--line);
}
.page-about .team-roles__item {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  padding: 18px 18px 20px;
  background: var(--ink-2);
  transition: background .18s;
}
.page-about .team-roles__item:hover {
  background: var(--ink-deep);
}
.page-about .team-roles__num {
  flex: none;
  font-family: var(--mono);
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  color: var(--neon);
  font-variant-numeric: tabular-nums;
}
.page-about .team-roles__item h3 {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 800;
}
.page-about .team-roles__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 数据能力 ---------- */
.page-about .tempo {
  display: grid;
  gap: 22px;
  margin-bottom: 40px;
}
.page-about .tempo-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 96px;
  align-items: center;
  gap: 8px 16px;
}
.page-about .tempo-row__label {
  grid-column: 1 / -1;
  font-size: 14px;
  color: var(--white);
  letter-spacing: .02em;
}
.page-about .tempo-row__track {
  position: relative;
  display: block;
  height: 20px;
  border: 2px solid var(--line-strong);
  background: var(--ink-2);
}
.page-about .tempo-row__fill {
  position: absolute;
  inset: 0 auto 0 0;
  display: block;
}
.page-about .tempo-row__fill--first {
  width: 33%;
  background: var(--electric);
}
.page-about .tempo-row__fill--second {
  width: 100%;
  background: repeating-linear-gradient(135deg, var(--neon) 0 10px, #17C7AA 10px 20px);
}
.page-about .tempo-row__val {
  font-family: var(--mono);
  font-size: 18px;
  font-weight: 700;
  color: var(--neon);
  text-align: right;
  font-variant-numeric: tabular-nums;
}
.page-about .tempo-notes {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
}
.page-about .tempo-note {
  padding-top: 14px;
  border-top: 2px solid var(--line-strong);
}
.page-about .tempo-note__tag {
  display: inline-block;
  margin-bottom: 8px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--amber);
}
.page-about .tempo-note p {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--mist);
}

/* ---------- 合作生态 ---------- */
.page-about .eco-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
  margin-bottom: 34px;
}
.page-about .eco-map-wrap {
  border: 2px solid var(--line);
  background:
    radial-gradient(circle at 50% 50%, rgba(47, 243, 208, .07), transparent 62%),
    var(--ink-2);
  padding: 10px;
}
.page-about .eco-map {
  display: block;
  width: 100%;
  height: auto;
}
.page-about .eco-link {
  stroke-opacity: .6;
  transition: stroke-opacity .18s, stroke-width .18s;
}
.page-about .eco-link--neon { stroke: var(--neon); }
.page-about .eco-link--electric { stroke: var(--electric); }
.page-about .eco-link:hover {
  stroke-opacity: 1;
  stroke-width: 4;
}
.page-about .eco-node {
  fill: var(--ink);
  stroke-width: 3;
}
.page-about .eco-node--neon { stroke: var(--neon); }
.page-about .eco-node--electric { stroke: var(--electric); }
.page-about .eco-core {
  fill: var(--neon);
  stroke: var(--ink);
  stroke-width: 4;
}
.page-about .eco-core-label {
  fill: var(--white);
  font-family: var(--sans);
  font-size: 16px;
  font-weight: 700;
}
.page-about .eco-label {
  fill: var(--white);
  font-family: var(--sans);
  font-size: 15px;
  font-weight: 600;
}
.page-about .eco-sub {
  fill: var(--mist);
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .08em;
}
.page-about .eco-list {
  display: grid;
  gap: 14px;
}
.page-about .eco-item {
  padding: 16px 16px 18px;
  border: 2px solid var(--line);
  border-left-width: 6px;
  background: var(--ink-2);
  transition: transform .18s, border-color .18s;
}
.page-about .eco-item--neon { border-left-color: var(--neon); }
.page-about .eco-item--electric { border-left-color: var(--electric); }
.page-about .eco-item:hover {
  transform: translateX(3px);
  border-color: var(--line-strong);
}
.page-about .eco-item h3 {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 800;
}
.page-about .eco-item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}
.page-about .eco-awards {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2px;
  background: var(--line);
  border: 2px solid var(--line-strong);
}
.page-about .eco-award {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 16px 18px;
  background: var(--ink-2);
}
.page-about .eco-award__year {
  flex: none;
  font-family: var(--mono);
  font-size: 20px;
  font-weight: 700;
  color: var(--amber);
  font-variant-numeric: tabular-nums;
}
.page-about .eco-award p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--white);
}

/* ---------- 运营中心 ---------- */
.page-about .center-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
  margin-bottom: 30px;
}
.page-about .center-card {
  padding: 22px;
  background: var(--pale);
  color: var(--ink);
  border: 2px solid var(--ink);
  box-shadow: var(--shadow-hard);
}
.page-about .center-card__label {
  margin: 0 0 10px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--ink-2);
}
.page-about .center-card__addr {
  margin: 0 0 14px;
  font-size: 18px;
  font-weight: 800;
  line-height: 1.5;
  color: var(--ink);
}
.page-about .center-card__note {
  margin: 0 0 8px;
  font-size: 13px;
  line-height: 1.75;
  color: #33507F;
  word-break: break-word;
}
.page-about .center-card__note:last-child {
  margin-bottom: 0;
}
.page-about .center-panel {
  padding: 22px;
  border: 2px solid var(--line-strong);
  background: var(--ink-2);
}
.page-about .center-panel__title {
  margin: 0 0 14px;
  font-size: 18px;
  font-weight: 800;
}
.page-about .center-panel__list {
  margin: 0 0 22px;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}
.page-about .center-panel__list li {
  position: relative;
  padding-left: 20px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}
.page-about .center-panel__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 9px;
  height: 9px;
  background: var(--neon);
}
.page-about .center-panel__link {
  display: inline-block;
}
.page-about .center-foot {
  margin: 0;
  max-width: 44em;
  font-size: 14px;
  line-height: 1.9;
  color: var(--mist);
}
.page-about .center-foot a {
  color: var(--neon);
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 243, 208, .4);
  transition: border-color .18s, color .18s;
}
.page-about .center-foot a:hover,
.page-about .center-foot a:focus-visible {
  color: var(--white);
  border-bottom-color: var(--white);
}

/* ---------- 焦点态 ---------- */
.page-about a:focus-visible,
.page-about summary:focus-visible,
.page-about .team-bar__seg:focus-visible {
  outline: 2px solid var(--neon);
  outline-offset: 3px;
}

/* ---------- 平板及以上 ---------- */
@media (min-width: 700px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .tempo-notes {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .team-roles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .eco-awards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .center-grid {
    grid-template-columns: minmax(0, .95fr) minmax(0, 1.05fr);
  }
  .page-about .tempo-row {
    grid-template-columns: 190px minmax(0, 1fr) 110px;
  }
  .page-about .tempo-row__label {
    grid-column: auto;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 900px) {
  .page-about {
    padding-bottom: 140px;
  }
  .page-about .about-layout {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: var(--about-gap);
  }
  .page-about .about-rail {
    position: sticky;
    top: 88px;
    align-self: start;
  }
  .page-about .about-rail__list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 0;
    padding-left: 22px;
    position: relative;
  }
  .page-about .about-rail__list::before {
    content: "";
    position: absolute;
    left: 4px;
    top: 10px;
    bottom: 10px;
    width: 2px;
    background: linear-gradient(var(--neon), var(--line-strong) 55%, var(--line));
  }
  .page-about .rail-node {
    display: block;
    padding: 15px 0;
    border: 0;
    border-radius: 0;
    background: none;
    position: relative;
  }
  .page-about .rail-node__dot {
    position: absolute;
    left: -22px;
    top: 21px;
    width: 10px;
    height: 10px;
    background: var(--ink);
    border: 2px solid var(--neon);
    transition: background .18s, box-shadow .18s;
  }
  .page-about .rail-node:hover {
    color: var(--neon);
  }
  .page-about .rail-node:hover .rail-node__dot {
    background: var(--neon);
    box-shadow: var(--glow-neon);
  }
  .page-about .rail-node__label {
    display: block;
    font-size: 13px;
    color: var(--white);
  }
  .page-about .rail-node__meta {
    display: block;
    margin-top: 3px;
    font-size: 11px;
    letter-spacing: .02em;
    color: var(--mist);
  }

  .page-about .about-hero {
    padding-left: 26px;
    margin-bottom: 112px;
  }
  .page-about .about-hero__lead {
    font-size: 17px;
  }
  .page-about .about-section {
    margin-bottom: 128px;
    scroll-margin-top: 104px;
  }
  .page-about .section-head {
    margin-bottom: 42px;
  }
  .page-about .line-item {
    padding: 28px 28px 28px 32px;
  }
  .page-about .line-list {
    gap: 22px;
  }
  .page-about .line-item:nth-child(2) {
    margin-left: 46px;
  }
  .page-about .line-item:nth-child(3) {
    margin-left: 92px;
  }
  .page-about .team-grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
    align-items: start;
    gap: 40px;
  }
  .page-about .eco-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    align-items: start;
    gap: 40px;
  }
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .line-item,
  .page-about .eco-item,
  .page-about .line-item__link,
  .page-about .season-item::before,
  .page-about .rail-node__dot,
  .page-about .team-bar__seg::after {
    transition: none;
  }
  .page-about .line-item:hover,
  .page-about .line-item:focus-within,
  .page-about .eco-item:hover,
  .page-about .line-item__link:hover {
    transform: none;
  }
}
</style>