.page-about {
  --about-rail: 206px;
  --about-hair: rgba(92, 104, 132, .32);
  position: relative;
  isolation: isolate;
  overflow: hidden;
  background: var(--night);
  color: var(--snow);
  font-family: var(--font-sans);
}

.page-about::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    radial-gradient(ellipse 66% 40% at 14% 5%, rgba(23, 195, 162, .10), transparent 64%),
    radial-gradient(ellipse 56% 36% at 92% 20%, rgba(91, 75, 224, .13), transparent 66%),
    repeating-radial-gradient(circle at 10% 4%, rgba(92, 104, 132, .11) 0 1px, transparent 1px 34px),
    repeating-radial-gradient(circle at 94% 58%, rgba(92, 104, 132, .08) 0 1px, transparent 1px 44px);
}

.page-about > * {
  position: relative;
  z-index: 1;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: 26px 0 6px;
}

.page-about .about-hero__grid {
  display: grid;
  gap: 26px;
  align-items: center;
}

.page-about .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--rule);
}

.page-about .breadcrumb__list a {
  color: var(--mist);
  text-decoration: none;
}

.page-about .breadcrumb__list a:hover {
  color: var(--teal-soft);
}

.page-about .breadcrumb__list li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--rule);
}

.page-about .about-hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin: 18px 0 14px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .12em;
  color: var(--teal-soft);
}

.page-about .about-hero__pulse {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--ember);
  animation: about-pulse 3s ease-out infinite;
}

@keyframes about-pulse {
  0% { box-shadow: 0 0 0 0 rgba(255, 90, 43, .5); }
  70% { box-shadow: 0 0 0 12px rgba(255, 90, 43, 0); }
  100% { box-shadow: 0 0 0 0 rgba(255, 90, 43, 0); }
}

.page-about .about-hero h1 {
  margin: 0 0 18px;
  font-size: clamp(30px, 6.2vw, 54px);
  line-height: 1.14;
  font-weight: 800;
  letter-spacing: -.02em;
  color: var(--snow);
}

.page-about .about-hero__lede {
  margin: 0 0 24px;
  max-width: 48ch;
  font-size: 15.5px;
  line-height: 1.85;
  font-weight: 300;
  color: var(--mist);
}

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

.page-about .about-btn {
  display: inline-flex;
  align-items: center;
  padding: 12px 22px;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: .02em;
  text-decoration: none;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%);
  transition: transform .2s var(--ease), background-color .2s var(--ease), color .2s var(--ease);
}

.page-about .about-btn--solid {
  background: var(--ember);
  color: var(--night);
}

.page-about .about-btn--solid:hover,
.page-about .about-btn--solid:focus-visible {
  background: var(--ember-soft);
  transform: translateY(-2px);
}

.page-about .about-btn--line {
  background: rgba(23, 195, 162, .1);
  color: var(--teal-soft);
  box-shadow: inset 0 0 0 1px rgba(23, 195, 162, .42);
}

.page-about .about-btn--line:hover,
.page-about .about-btn--line:focus-visible {
  background: rgba(23, 195, 162, .22);
  transform: translateY(-2px);
}

.page-about .about-hero__media {
  margin: 0;
  background: var(--panel-deep);
  box-shadow: inset 0 0 0 1px var(--about-hair);
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-hero__media .media-frame__caption {
  display: block;
  padding: 10px 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--mist);
  background: rgba(12, 24, 56, .82);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 34px 0 0;
  padding: 0;
  list-style: none;
  background: var(--about-hair);
  border-top: 1px solid var(--about-hair);
  border-bottom: 1px solid var(--about-hair);
}

.page-about .about-stat {
  padding: 18px 14px;
  background: var(--night);
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(24px, 4.4vw, 34px);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -.01em;
  color: var(--snow);
}

.page-about .about-stat__num em {
  font-style: normal;
  font-size: .48em;
  margin-left: 3px;
  color: var(--teal);
}

.page-about .about-stat__label {
  display: block;
  margin-top: 8px;
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--mist);
}

/* ---------- 主体长卷 ---------- */
.page-about .about-body {
  margin-top: 54px;
}

.page-about .about-rail {
  margin-bottom: 32px;
}

.page-about .about-rail__head {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--teal);
}

.page-about .about-rail__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
}

.page-about .about-rail__link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 9px 13px;
  white-space: nowrap;
  text-decoration: none;
  font-size: 13px;
  color: var(--mist);
  background: rgba(19, 32, 74, .6);
  box-shadow: inset 0 0 0 1px rgba(92, 104, 132, .28);
  transition: color .2s var(--ease), background-color .2s var(--ease), box-shadow .2s var(--ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--snow);
  background: rgba(23, 195, 162, .16);
  box-shadow: inset 0 0 0 1px var(--teal);
}

.page-about .about-rail__num {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 800;
  color: var(--teal);
  letter-spacing: .04em;
}

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

.page-about .about-section {
  position: relative;
  padding: 46px 0 10px;
  scroll-margin-top: 96px;
}

.page-about .about-section::before {
  content: "";
  position: absolute;
  top: 16px;
  left: 0;
  width: 46%;
  height: 4px;
  background: linear-gradient(90deg, rgba(23, 195, 162, .85), rgba(23, 195, 162, 0));
  transform: skewY(-1.4deg);
  transform-origin: left center;
}

.page-about .about-section .section-no {
  position: absolute;
  top: 26px;
  right: 0;
  font-family: var(--font-mono);
  font-size: clamp(38px, 7vw, 62px);
  font-weight: 800;
  line-height: 1;
  color: var(--snow);
  opacity: .12;
  pointer-events: none;
  user-select: none;
}

.page-about .about-h2 {
  position: relative;
  margin: 0 0 16px;
  max-width: 24ch;
  font-size: clamp(22px, 3.4vw, 32px);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -.015em;
  color: var(--snow);
}

.page-about .about-lead {
  margin: 0 0 22px;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.8;
  font-weight: 300;
  color: var(--teal-soft);
}

.page-about .about-section p {
  margin: 0 0 14px;
  font-size: 15.5px;
  line-height: 1.85;
  font-weight: 300;
  color: var(--mist);
}

.page-about .about-section a {
  color: var(--teal);
  text-decoration: none;
  border-bottom: 1px solid rgba(23, 195, 162, .4);
}

.page-about .about-section a:hover {
  color: var(--teal-soft);
}

.page-about .about-cols {
  display: grid;
  gap: 24px;
}

.page-about .about-note {
  padding: 18px 20px 16px;
  background: rgba(19, 32, 74, .74);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%);
  box-shadow: inset 0 0 0 1px rgba(127, 230, 210, .18);
}

.page-about .about-note ul {
  margin: 0;
  padding: 0 0 0 16px;
  list-style: none;
}

.page-about .about-note li {
  position: relative;
  padding: 5px 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--teal-soft);
}

.page-about .about-note li::before {
  content: "";
  position: absolute;
  left: -16px;
  top: 14px;
  width: 6px;
  height: 6px;
  background: var(--teal);
  transform: rotate(45deg);
}

/* ---------- 赛季时间轴 ---------- */
.page-about .about-timeline {
  margin: 6px 0 0;
  padding: 0 0 0 24px;
  list-style: none;
  border-left: 1px solid var(--about-hair);
}

.page-about .about-timeline__item {
  position: relative;
  margin-bottom: 12px;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -29px;
  top: 20px;
  width: 9px;
  height: 9px;
  background: var(--night);
  border: 2px solid var(--teal);
  transform: rotate(45deg);
}

.page-about .about-node {
  background: rgba(19, 32, 74, .55);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%);
  transition: background-color .25s var(--ease);
}

.page-about .about-node[open] {
  background: rgba(19, 32, 74, .92);
}

.page-about .about-node__sum {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  padding: 14px 20px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-node__sum::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 17px;
  font-weight: 800;
  color: var(--teal);
}

.page-about .about-node[open] .about-node__sum::after {
  content: "–";
}

.page-about .about-node__tag {
  padding: 3px 9px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 800;
  letter-spacing: .06em;
  color: var(--snow);
  background: rgba(91, 75, 224, .3);
}

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

.page-about .about-node__body {
  padding: 0 20px 18px;
}

.page-about .about-node__body p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
}

/* ---------- 团队 ---------- */
.page-about .about-team-head {
  display: grid;
  gap: 24px;
  margin: 22px 0 28px;
}

.page-about .about-team-head__left {
  display: grid;
  gap: 20px;
}

.page-about .about-team-head__copy p {
  margin: 0 0 12px;
  font-size: 14.5px;
  line-height: 1.8;
}

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

.page-about .about-donut {
  margin: 0;
  text-align: center;
}

.page-about .about-donut svg {
  display: block;
  width: 100%;
  max-width: 186px;
  height: auto;
  margin: 0 auto;
}

.page-about .about-donut figcaption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--mist);
}

.page-about .about-figure {
  margin: 0;
  background: var(--panel-deep);
  box-shadow: inset 0 0 0 1px var(--about-hair);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-figure .media-frame__caption {
  display: block;
  padding: 10px 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--mist);
  background: rgba(12, 24, 56, .82);
}

.page-about .about-filter {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 20px;
  padding: 0;
  list-style: none;
}

.page-about .filter-chip {
  padding: 8px 14px;
  font-family: var(--font-sans);
  font-size: 13px;
  color: var(--mist);
  background: rgba(19, 32, 74, .6);
  border: 1px solid rgba(92, 104, 132, .35);
  cursor: pointer;
  transition: color .2s var(--ease), border-color .2s var(--ease), background-color .2s var(--ease);
}

.page-about .filter-chip:hover,
.page-about .filter-chip:focus-visible {
  color: var(--snow);
  border-color: var(--teal);
}

.page-about .filter-chip.is-on,
.page-about .filter-chip[aria-pressed="true"] {
  color: var(--night);
  background: var(--teal);
  border-color: var(--teal);
}

.page-about .filter-count {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--rule);
}

.page-about .about-groups {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 16px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-group {
  padding: 18px 20px 20px;
  background: rgba(19, 32, 74, .62);
  box-shadow: inset 0 0 0 1px rgba(92, 104, 132, .28);
}

.page-about .about-group__num {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 30px;
  font-weight: 800;
  line-height: 1;
  color: var(--teal);
}

.page-about .about-group__num span {
  margin-left: 4px;
  font-size: 12px;
  color: var(--mist);
}

.page-about .about-group__name {
  margin: 0 0 10px;
  font-size: 16px;
  font-weight: 700;
  color: var(--snow);
}

.page-about .about-group__desc {
  margin: 0 0 14px;
  font-size: 13.5px;
  line-height: 1.78;
  font-weight: 300;
}

.page-about .about-group__meta {
  margin: 0;
  padding-top: 10px;
  border-top: 1px solid rgba(92, 104, 132, .3);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--rule);
}

/* ---------- 合作生态 ---------- */
.page-about .about-partners {
  display: grid;
  gap: 16px;
  margin: 4px 0 18px;
  padding: 0;
  list-style: none;
}

.page-about .about-partner {
  position: relative;
  padding: 22px 20px 24px;
  overflow: hidden;
  background: linear-gradient(158deg, rgba(19, 32, 74, .92), rgba(12, 24, 56, .92));
  box-shadow: inset 0 0 0 1px rgba(23, 195, 162, .22);
}

.page-about .about-partner::after {
  content: "";
  position: absolute;
  right: -34px;
  bottom: 14px;
  width: 130px;
  height: 3px;
  background: var(--teal);
  transform: rotate(-38deg);
  opacity: .5;
}

.page-about .about-partner__name {
  margin: 0 0 10px;
  font-size: 16px;
  font-weight: 700;
  color: var(--snow);
}

.page-about .about-partner__desc {
  position: relative;
  margin: 0;
  font-size: 13.5px;
  line-height: 1.78;
  font-weight: 300;
}

.page-about .about-partner-note {
  margin: 0;
  padding: 16px 18px;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--mist);
  background: rgba(91, 75, 224, .1);
  border-left: 3px solid var(--violet);
}

/* ---------- 内容积累 ---------- */
.page-about .about-output {
  display: grid;
  gap: 24px;
  margin-top: 6px;
}

.page-about .about-metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 20px 0 0;
  padding: 1px;
  list-style: none;
  background: var(--about-hair);
}

.page-about .about-metrics__item {
  padding: 16px 14px;
  background: var(--night);
}

.page-about .about-metrics__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(20px, 3vw, 28px);
  font-weight: 800;
  line-height: 1;
  color: var(--snow);
}

.page-about .about-metrics__num em {
  font-style: normal;
  font-size: .46em;
  margin-left: 3px;
  color: var(--teal);
}

.page-about .about-metrics__label {
  display: block;
  margin-top: 8px;
  font-size: 12px;
  line-height: 1.5;
  color: var(--mist);
}

/* ---------- 收束 ---------- */
.page-about .about-next {
  margin-top: 52px;
  padding: 44px 0 64px;
  border-top: 1px solid var(--about-hair);
  background: linear-gradient(180deg, rgba(91, 75, 224, .12), rgba(10, 19, 48, 0) 72%);
}

.page-about .about-next__inner {
  display: grid;
  gap: 22px;
}

.page-about .about-next h2 {
  margin: 0;
  font-size: clamp(20px, 3vw, 26px);
  font-weight: 700;
  color: var(--snow);
}

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

.page-about .about-next__links a {
  display: block;
  padding: 18px 20px 20px;
  text-decoration: none;
  background: rgba(19, 32, 74, .68);
  box-shadow: inset 0 0 0 1px rgba(92, 104, 132, .3);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%);
  transition: transform .22s var(--ease), box-shadow .22s var(--ease);
}

.page-about .about-next__links a:hover,
.page-about .about-next__links a:focus-visible {
  transform: translateY(-3px);
  box-shadow: inset 0 0 0 1px var(--teal);
}

.page-about .about-next__links span {
  display: block;
  font-size: 15px;
  font-weight: 700;
  color: var(--snow);
}

.page-about .about-next__links em {
  display: block;
  margin-top: 7px;
  font-style: normal;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--teal);
}

/* ---------- 响应式 ---------- */
@media (min-width: 560px) {
  .page-about .about-team-head__left {
    grid-template-columns: 190px minmax(0, 1fr);
    align-items: center;
  }
}

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

@media (min-width: 780px) {
  .page-about .about-cols {
    grid-template-columns: minmax(0, 1.7fr) minmax(0, 1fr);
    gap: 34px;
    align-items: start;
  }

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

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    gap: 44px;
  }

  .page-about .about-team-head {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    gap: 36px;
    align-items: start;
  }

  .page-about .about-output {
    grid-template-columns: minmax(0, .82fr) minmax(0, 1.18fr);
    gap: 36px;
    align-items: start;
  }
}

@media (min-width: 1024px) {
  .page-about .about-body {
    display: grid;
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: 52px;
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 92px;
    margin-bottom: 0;
    padding-right: 18px;
    border-right: 1px solid var(--about-hair);
  }

  .page-about .about-rail__list {
    display: block;
    overflow: visible;
    padding: 0;
  }

  .page-about .about-rail__link {
    padding: 10px 0 10px 14px;
    white-space: normal;
    background: none;
    box-shadow: none;
    border-left: 2px solid rgba(92, 104, 132, .35);
  }

  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    background: rgba(23, 195, 162, .1);
    box-shadow: none;
    border-left-color: var(--teal);
  }

  .page-about .about-rail__scale {
    display: flex;
    justify-content: space-between;
    margin-top: 18px;
    padding-top: 12px;
    border-top: 1px solid var(--about-hair);
    font-family: var(--font-mono);
    font-size: 10px;
    color: var(--rule);
  }

  .page-about .about-section {
    padding-top: 54px;
  }

  .page-about .about-section .section-no {
    top: 30px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-hero__pulse {
    animation: none;
  }

  .page-about .about-btn,
  .page-about .about-rail__link,
  .page-about .filter-chip,
  .page-about .about-next__links a {
    transition: none;
  }
}