.page-about {
  --about-rail-w: 200px;
  --about-gap: clamp(30px, 4.5vw, 72px);
  background: var(--navy);
  color: var(--ink);
  font-family: var(--font-body);
}

.page-about img {
  max-width: 100%;
  height: auto;
}

.page-about [data-reveal] {
  transition: opacity 0.5s var(--ease), transform 0.5s var(--ease);
}

/* ---------- 首屏 ---------- */
.page-about .about-masthead {
  position: relative;
  padding: clamp(24px, 3.5vw, 48px) 0 clamp(48px, 7vw, 96px);
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(880px 420px at 88% -8%, rgba(123, 92, 255, 0.2), transparent 66%),
    radial-gradient(760px 380px at 4% 112%, rgba(255, 106, 19, 0.14), transparent 70%);
}

.page-about .masthead-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 52px);
  margin-top: clamp(22px, 3.5vw, 40px);
}

.page-about .masthead-copy h1 {
  margin: 14px 0 0;
  max-width: 640px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(32px, 5.6vw, 62px);
  line-height: 1.14;
  letter-spacing: -0.01em;
  color: #ffffff;
}

.page-about .masthead-copy .section-lede {
  margin: 20px 0 0;
  max-width: 48ch;
  font-size: clamp(16px, 1.35vw, 17px);
  line-height: 1.85;
  color: var(--muted);
}

.page-about .masthead-panel {
  position: relative;
  padding: 24px 22px 26px;
  background: linear-gradient(158deg, var(--navy-2), var(--navy-3));
  border: 1px solid var(--line-strong);
}

.page-about .masthead-panel::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 62px;
  height: 2px;
  background: var(--orange);
}

.page-about .masthead-panel__caption {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--orange);
}

.page-about .masthead-stats {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .masthead-stat {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 13px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .masthead-stat:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .masthead-stat__num {
  flex: none;
  min-width: 3ch;
  font-family: var(--font-mono);
  font-style: italic;
  font-weight: 700;
  font-size: 30px;
  line-height: 1;
  color: var(--orange);
}

.page-about .masthead-stat__label {
  font-size: 14px;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 主体布局 ---------- */
.page-about .about-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--about-gap);
  padding: clamp(40px, 6vw, 88px) 0 clamp(56px, 8vw, 116px);
}

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

.page-about .about-rail__caption {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
}

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

.page-about .rail-nav__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 8px 12px;
  font-size: 14px;
  color: var(--muted);
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .rail-nav__link:hover,
.page-about .rail-nav__link:focus-visible {
  color: #ffffff;
  border-left-color: var(--orange);
  background: rgba(255, 106, 19, 0.08);
}

.page-about .rail-nav__link:focus-visible {
  outline: 2px solid var(--orange-soft);
  outline-offset: 2px;
}

.page-about .rail-nav__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 12px;
  color: var(--orange);
}

/* ---------- 章节结构 ---------- */
.page-about .about-body > .about-section + .about-section {
  margin-top: clamp(48px, 7vw, 96px);
  padding-top: clamp(40px, 6vw, 76px);
  border-top: 1px solid var(--line);
}

.page-about .about-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: clamp(14px, 2vw, 26px);
  align-items: start;
  margin-bottom: clamp(18px, 2.5vw, 28px);
}

.page-about .about-num {
  font-family: var(--font-mono);
  font-style: italic;
  font-weight: 700;
  font-size: clamp(30px, 4.4vw, 52px);
  line-height: 0.9;
  letter-spacing: -0.02em;
  color: var(--orange);
}

.page-about .about-head__text .section-kicker {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .about-head__text .section-title {
  margin: 10px 0 0;
  max-width: 26ch;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(22px, 3vw, 34px);
  line-height: 1.32;
  color: #ffffff;
}

.page-about .about-copy {
  max-width: 42em;
}

.page-about .about-copy p {
  margin: 0 0 18px;
  font-size: 16px;
  line-height: 1.88;
  color: var(--ink);
}

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

.page-about .about-note {
  max-width: 46em;
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding: 14px 18px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
  border-left: 2px solid var(--violet);
  background: rgba(123, 92, 255, 0.08);
}

/* ---------- 赛季纪年 ---------- */
.page-about .about-timeline {
  position: relative;
  margin: clamp(22px, 3.5vw, 36px) 0 0;
  padding: clamp(24px, 3.5vw, 44px) clamp(18px, 3vw, 40px);
  background: var(--navy-2);
  border: 1px solid var(--line-strong);
  overflow: hidden;
}

.page-about .about-timeline__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.3;
  pointer-events: none;
}

.page-about .about-timeline__list {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: 1fr;
}

.page-about .about-timeline__item {
  position: relative;
  padding: 20px 18px 20px 0;
  border-top: 1px solid var(--line-strong);
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  top: -4.5px;
  left: 0;
  width: 9px;
  height: 9px;
  background: var(--orange);
  transform: rotate(45deg);
  transition: box-shadow 0.25s var(--ease), background 0.25s var(--ease);
}

.page-about .about-timeline__item:hover::before,
.page-about .about-timeline__item:focus-within::before {
  background: var(--orange-soft);
  box-shadow: 0 0 0 6px rgba(255, 106, 19, 0.22);
}

.page-about .about-timeline__year {
  display: block;
  font-family: var(--font-mono);
  font-style: italic;
  font-weight: 700;
  font-size: clamp(22px, 2.8vw, 30px);
  line-height: 1;
  color: #ffffff;
  transition: color 0.2s var(--ease);
}

.page-about .about-timeline__item:hover .about-timeline__year {
  color: var(--orange);
}

.page-about .about-timeline__label {
  display: block;
  margin-top: 10px;
  max-width: 26ch;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 服务团队 ---------- */
.page-about .about-team {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 3.5vw, 44px);
  margin-top: clamp(22px, 3.5vw, 38px);
}

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

.page-about .about-team .tab {
  padding: 9px 16px;
  font-family: var(--font-body);
  font-size: 14px;
  color: var(--muted);
  background: transparent;
  border: 1px solid var(--line);
  cursor: pointer;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .about-team .tab:hover {
  color: var(--ink);
  border-color: var(--line-strong);
}

.page-about .about-team .tab[aria-selected="true"],
.page-about .about-team .tab.is-active {
  color: var(--navy);
  background: var(--orange);
  border-color: var(--orange);
}

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

.page-about .about-team .panel {
  padding: 22px 22px 24px;
  background: var(--navy-2);
  border: 1px solid var(--line);
  border-left: 3px solid var(--orange);
}

.page-about .about-team .panel[hidden] {
  display: none;
}

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

.page-about .about-list li {
  position: relative;
  padding-left: 20px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--ink);
}

.page-about .about-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.75em;
  width: 8px;
  height: 2px;
  background: var(--orange);
}

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

.page-about .about-team__media img {
  display: block;
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border: 1px solid var(--line);
  background: var(--navy-3);
}

.page-about .about-team__cap {
  margin: 12px 0 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 内容与数据 ---------- */
.page-about .about-metrics {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: clamp(22px, 3.5vw, 38px) 0 0;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-metric {
  padding: clamp(22px, 2.8vw, 30px);
  background: var(--navy-2);
  border-top: 2px solid var(--violet);
  transition: background 0.25s var(--ease), transform 0.25s var(--ease);
}

.page-about .about-metric:nth-child(2) {
  border-top-color: var(--orange);
}

.page-about .about-metric:nth-child(3) {
  border-top-color: var(--green);
}

.page-about .about-metric:hover {
  background: var(--navy-3);
  transform: translateY(-2px);
}

.page-about .about-metric__num {
  margin: 0;
  font-family: var(--font-mono);
  font-style: italic;
  font-weight: 700;
  font-size: clamp(30px, 4vw, 44px);
  line-height: 1;
  letter-spacing: -0.01em;
  color: #ffffff;
}

.page-about .about-metric__title {
  margin: 10px 0 0;
  font-size: 15px;
  font-weight: 600;
  color: var(--orange);
}

.page-about .about-metric__text {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 合作生态 ---------- */
.page-about .about-eco {
  margin: clamp(22px, 3.5vw, 36px) 0 0;
  border: 1px solid var(--line);
  overflow: hidden;
}

.page-about .about-eco__banner {
  display: block;
  width: 100%;
  aspect-ratio: 2 / 1;
  object-fit: cover;
}

.page-about .about-eco__groups {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border-top: 1px solid var(--line);
}

.page-about .about-eco__group {
  position: relative;
  padding: clamp(22px, 3vw, 34px);
  background: var(--navy-2);
  transition: background 0.25s var(--ease);
}

.page-about .about-eco__group:hover {
  background: var(--navy-3);
}

.page-about .about-eco__group::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--orange);
  transition: width 0.3s var(--ease);
}

.page-about .about-eco__group:hover::after {
  width: 100%;
}

.page-about .about-eco__count {
  margin: 0;
  font-family: var(--font-mono);
  font-style: italic;
  font-weight: 700;
  font-size: clamp(40px, 6vw, 62px);
  line-height: 1;
  color: var(--orange);
}

.page-about .about-eco__title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(18px, 2vw, 22px);
  color: #ffffff;
}

.page-about .about-eco__text {
  margin: 12px 0 0;
  max-width: 38ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 长期用户 ---------- */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(22px, 3.5vw, 38px) 0 0;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .stat-figure {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: clamp(20px, 2.6vw, 30px);
  background: var(--navy-2);
}

.page-about .stat-figure__num {
  font-family: var(--font-mono);
  font-style: italic;
  font-weight: 700;
  font-size: clamp(28px, 3.6vw, 40px);
  line-height: 1;
  color: var(--green);
}

.page-about .stat-figure:nth-child(2) .stat-figure__num {
  color: var(--violet);
}

.page-about .stat-figure:nth-child(3) .stat-figure__num {
  color: var(--orange);
}

.page-about .stat-figure:nth-child(4) .stat-figure__num {
  color: var(--orange-soft);
}

.page-about .stat-figure__label {
  font-size: 13px;
  line-height: 1.72;
  color: var(--muted);
}

.page-about .about-cta-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 20px;
  margin-top: clamp(26px, 4vw, 44px);
  padding-top: clamp(22px, 3vw, 32px);
  border-top: 1px solid var(--line);
}

.page-about .about-cta-row .btn--primary {
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-metrics {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

@media (min-width: 800px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-timeline__list {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .page-about .about-timeline__item {
    padding-right: 22px;
  }
}

@media (max-width: 799px) {
  .page-about .about-timeline__item {
    padding-right: 6px;
  }

  .page-about .about-timeline__label {
    max-width: none;
  }
}

@media (min-width: 900px) {
  .page-about .masthead-grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 0.6fr);
    align-items: end;
    gap: clamp(36px, 5vw, 72px);
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 1.22fr) minmax(0, 0.78fr);
    align-items: start;
    gap: clamp(28px, 4vw, 52px);
  }
}

@media (min-width: 1000px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 112px;
    align-self: start;
  }

  .page-about .rail-nav {
    flex-direction: column;
    gap: 0;
  }

  .page-about .rail-nav__link {
    padding: 11px 0 11px 16px;
    border-left: 1px solid var(--line);
  }
}
<<<END>>>