.page-about {
  background: var(--c-base);
  color: var(--c-text);
  overflow-x: clip;
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb {
  padding-top: 18px;
}

.page-about .breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 12px;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--c-fog);
}

.page-about .breadcrumb-list a {
  color: var(--c-fog);
  text-decoration: none;
  transition: color .2s ease;
}

.page-about .breadcrumb-list a:hover {
  color: var(--c-green);
}

.page-about .breadcrumb-list li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--c-line);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(30px, 5vw, 54px) 0 clamp(48px, 7vw, 80px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: 0;
  left: var(--gutter);
  right: var(--gutter);
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--c-line), transparent);
}

.page-about .hero-layout {
  display: grid;
  gap: 32px;
}

.page-about .hero-lead h1 {
  margin: 14px 0 0;
  font-size: clamp(30px, 7.4vw, 56px);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -.025em;
}

.page-about .hero-lead h1 span {
  display: block;
  color: var(--c-green);
}

.page-about .hero-sub {
  max-width: 44ch;
  margin: 20px 0 0;
  font-size: 16px;
  line-height: 1.78;
  color: var(--c-fog);
}

.page-about .hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .hero-board {
  padding: 24px 20px 22px;
  border-left: 2px solid var(--c-green);
}

.page-about .hero-numbers {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px 14px;
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .hero-numbers li {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .hero-numbers .stat-value {
  font-size: 30px;
  line-height: 1.05;
  color: var(--c-green);
}

.page-about .hero-numbers li:nth-child(2) .stat-value {
  color: var(--c-orange);
}

.page-about .hero-numbers li:nth-child(3) .stat-value {
  color: var(--c-teal);
}

.page-about .hero-numbers .stat-label {
  font-size: 12px;
  line-height: 1.5;
  color: var(--c-fog);
}

.page-about .hero-board__note {
  margin: 20px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--line-soft);
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--c-fog);
}

/* ---------- 通用章节标题 ---------- */
.page-about .sec-head {
  max-width: 60ch;
}

.page-about .sec-head h2 {
  margin: 12px 0 0;
  font-size: clamp(23px, 4.6vw, 36px);
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: -.015em;
}

.page-about .sec-intro {
  margin: 16px 0 0;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--c-fog);
}

/* ---------- 起点 ---------- */
.page-about .about-origin {
  position: relative;
  padding: clamp(52px, 8vw, 96px) 0;
  background: linear-gradient(180deg, var(--c-panel) 0%, var(--c-base) 100%);
}

.page-about .about-origin::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  transform: skewX(-16deg);
  transform-origin: left center;
  background: linear-gradient(90deg,
    var(--c-green) 0 26%,
    transparent 26% 31%,
    var(--c-orange) 31% 56%,
    transparent 56% 61%,
    var(--c-teal) 61% 100%);
}

.page-about .origin-layout {
  display: grid;
  gap: 32px;
}

.page-about .origin-main h2 {
  margin: 12px 0 20px;
  font-size: clamp(23px, 4.6vw, 36px);
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: -.015em;
}

.page-about .origin-side {
  padding: 22px 20px;
}

.page-about .origin-users {
  margin: 16px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 16px;
}

.page-about .origin-users li {
  display: grid;
  gap: 4px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .origin-users li:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-about .origin-users__name {
  font-size: 15px;
  font-weight: 700;
  color: var(--c-text);
}

.page-about .origin-users__note {
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--c-fog);
}

/* ---------- 赛季刻度 ---------- */
.page-about .about-growth {
  padding: clamp(52px, 8vw, 96px) 0;
  background: var(--c-panel);
}

.page-about .growth-body {
  display: grid;
  gap: 26px;
  margin-top: clamp(30px, 5vw, 48px);
}

.page-about .season-rail {
  overflow-x: auto;
  padding-bottom: 6px;
  scrollbar-width: none;
}

.page-about .season-rail::-webkit-scrollbar {
  display: none;
}

.page-about .season-rail__list {
  display: flex;
  align-items: center;
  gap: 26px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .season-rail__list li {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: none;
}

.page-about .season-rail__dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  border: 1px solid var(--c-line);
  background: transparent;
  transition: background .2s ease, box-shadow .2s ease;
}

.page-about .season-rail__label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--c-fog);
}

.page-about .season-rail__list li.is-on .season-rail__dot {
  background: var(--c-green);
  border-color: var(--c-green);
  box-shadow: 0 0 0 4px var(--glow-green);
}

.page-about .season-rail__list li.is-on .season-rail__label {
  color: var(--c-green);
}

.page-about .season-list {
  position: relative;
  margin: 0;
  padding: 0 0 0 18px;
  list-style: none;
  display: grid;
  gap: 16px;
  border-left: 1px solid var(--line-soft);
}

.page-about .season-item {
  position: relative;
  padding: 18px 18px 20px;
  background: var(--c-base);
  border: 1px solid var(--line-soft);
  border-left: 2px solid var(--c-line);
  transition: border-left-color .22s ease, transform .22s ease;
}

.page-about .season-item:last-child {
  border-left-color: var(--c-green);
}

.page-about .season-item:hover {
  border-left-color: var(--c-orange);
  transform: translateX(3px);
}

.page-about .season-meta {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--c-fog);
}

.page-about .season-meta .num {
  color: var(--c-green);
  margin-right: 8px;
  font-size: 13px;
}

.page-about .season-item h3 {
  margin: 10px 0 8px;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
}

.page-about .season-item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--c-fog);
}

.page-about .season-art {
  margin: clamp(30px, 5vw, 48px) 0 0;
}

.page-about .season-art figcaption {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--c-fog);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  position: relative;
  overflow: hidden;
}

.page-about .team-stage {
  position: relative;
  padding: clamp(52px, 8vw, 96px) 0;
}

.page-about .team-stage__img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .16;
  filter: saturate(.65);
  z-index: 0;
}

.page-about .team-stage__veil {
  position: absolute;
  inset: 0;
  z-index: 1;
  background: linear-gradient(180deg,
    var(--c-base) 0%,
    rgba(7, 11, 20, .72) 42%,
    rgba(7, 11, 20, .9) 70%,
    var(--c-base) 100%);
}

.page-about .team-stage > .wrap {
  position: relative;
  z-index: 2;
}

.page-about .role-list {
  margin: clamp(28px, 5vw, 44px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .role {
  padding: 22px 0;
  border-top: 1px solid var(--line-soft);
}

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

.page-about .role-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
}

.page-about .role-num {
  font-size: 26px;
  line-height: 1;
  color: var(--c-green);
}

.page-about .role:nth-child(2) .role-num {
  color: var(--c-orange);
}

.page-about .role:nth-child(3) .role-num {
  color: var(--c-teal);
}

.page-about .role-name {
  margin: 0;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: .01em;
}

.page-about .role-body {
  margin-top: 12px;
  display: grid;
  gap: 10px;
}

.page-about .role-desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--c-text);
}

.page-about .role-note {
  margin: 0;
  padding-left: 14px;
  border-left: 1px solid var(--line-soft);
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--c-fog);
  transition: border-color .2s ease, color .2s ease, transform .2s ease;
}

.page-about .role:hover .role-note,
.page-about .role:focus-within .role-note {
  border-left-color: var(--c-green);
  color: var(--c-text);
  transform: translateX(4px);
}

/* ---------- 数据来源 ---------- */
.page-about .about-source {
  padding: clamp(52px, 8vw, 96px) 0;
}

.page-about .source-grid {
  display: grid;
  gap: 18px;
  margin-top: clamp(28px, 5vw, 44px);
}

.page-about .source-card {
  padding: 24px 20px 26px;
  display: grid;
  gap: 10px;
  align-content: start;
}

.page-about .source-num {
  font-size: 15px;
  letter-spacing: .16em;
  color: var(--c-green);
}

.page-about .source-card:nth-child(2) .source-num {
  color: var(--c-orange);
}

.page-about .source-card:nth-child(3) .source-num {
  color: var(--c-teal);
}

.page-about .source-title {
  margin: 0;
  font-size: 18px;
  font-weight: 700;
}

.page-about .source-text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--c-fog);
}

/* ---------- 合作生态 ---------- */
.page-about .about-eco {
  padding: clamp(52px, 8vw, 96px) 0;
  background: var(--c-panel);
  position: relative;
}

.page-about .eco-layout {
  display: grid;
  gap: 38px;
}

.page-about .eco-copy h2 {
  margin: 12px 0 0;
  font-size: clamp(23px, 4.6vw, 36px);
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: -.015em;
}

.page-about .eco-intro {
  margin: 16px 0 0;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--c-fog);
}

.page-about .eco-list {
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 16px;
}

.page-about .eco-item {
  position: relative;
  padding: 16px 18px 18px 34px;
  border: 1px solid var(--line-soft);
  background: var(--c-base);
  transition: border-color .2s ease, background .2s ease;
}

.page-about .eco-item__dot {
  position: absolute;
  top: 20px;
  left: 14px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--c-green);
}

.page-about .eco-item--venue .eco-item__dot {
  background: var(--c-teal);
}

.page-about .eco-item--campus .eco-item__dot {
  background: var(--c-orange);
}

.page-about .eco-item--data:hover {
  border-color: var(--c-green);
}

.page-about .eco-item--venue:hover {
  border-color: var(--c-teal);
}

.page-about .eco-item--campus:hover {
  border-color: var(--c-orange);
}

.page-about .eco-item__name {
  margin: 0;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.5;
}

.page-about .eco-item__text {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--c-fog);
}

.page-about .eco-visual {
  position: relative;
  margin: 0;
  max-width: 460px;
  width: 100%;
  justify-self: center;
}

.page-about .eco-visual img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 50%;
  opacity: .32;
  filter: saturate(.6);
}

.page-about .eco-graph {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.page-about .eco-layer circle {
  fill: none;
  stroke-width: 9;
  stroke-dasharray: 5 11;
  transition: stroke-width .22s ease, opacity .22s ease;
}

.page-about .eco-layer--data circle {
  stroke: var(--c-green);
  opacity: .55;
}

.page-about .eco-layer--venue circle {
  stroke: var(--c-teal);
  opacity: .5;
}

.page-about .eco-layer--campus circle {
  stroke: var(--c-orange);
  opacity: .5;
}

.page-about .eco-layer:hover circle {
  stroke-width: 17;
  opacity: 1;
}

.page-about .eco-core {
  fill: var(--c-green);
  opacity: .85;
}

.page-about .eco-caption {
  margin-top: 18px;
  text-align: center;
  font-size: 12.5px;
  letter-spacing: .04em;
  color: var(--c-fog);
}

/* ---------- 行业认可 ---------- */
.page-about .about-recogn {
  padding: clamp(48px, 7.5vw, 88px) 0;
}

.page-about .recogn-list {
  margin: clamp(24px, 4vw, 36px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .recogn-item {
  display: grid;
  gap: 6px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line-soft);
}

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

.page-about .recogn-tag {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--c-green);
}

.page-about .recogn-name {
  font-size: 17px;
  font-weight: 600;
  line-height: 1.5;
}

.page-about .recogn-meta {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .08em;
  color: var(--c-fog);
}

.page-about .recogn-users {
  margin-top: 26px;
  padding-top: 22px;
  border-top: 1px solid var(--line-soft);
  display: grid;
  gap: 18px;
}

.page-about .recogn-users__lead {
  margin: 0;
  max-width: 52ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--c-text);
}

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

/* ---------- 接下来 ---------- */
.page-about .about-next {
  position: relative;
  padding: clamp(54px, 8.5vw, 104px) 0 clamp(60px, 9vw, 110px);
}

.page-about .about-next::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: linear-gradient(90deg,
    var(--c-green) 0 34%,
    var(--c-orange) 46% 62%,
    transparent 78%);
}

.page-about .next-layout {
  display: grid;
  gap: 34px;
}

.page-about .next-copy h2 {
  margin: 12px 0 0;
  font-size: clamp(23px, 4.6vw, 36px);
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: -.015em;
}

.page-about .next-list {
  margin: clamp(24px, 4vw, 36px) 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 20px;
}

.page-about .next-list li {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  column-gap: 14px;
  row-gap: 6px;
  padding-top: 18px;
  border-top: 1px solid var(--line-soft);
}

.page-about .next-num {
  grid-row: 1 / span 2;
  font-size: 20px;
  line-height: 1.2;
  color: var(--c-green);
}

.page-about .next-list li:nth-child(2) .next-num {
  color: var(--c-orange);
}

.page-about .next-list li:nth-child(3) .next-num {
  color: var(--c-teal);
}

.page-about .next-list h3 {
  margin: 0;
  font-size: 16.5px;
  font-weight: 700;
  line-height: 1.5;
}

.page-about .next-list p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--c-fog);
}

.page-about .next-cta {
  padding: 26px 22px 28px;
  border-top: 2px solid var(--c-green);
  align-self: start;
}

.page-about .next-cta__title {
  margin: 14px 0 0;
  font-size: 19px;
  font-weight: 800;
  line-height: 1.45;
}

.page-about .next-cta__text {
  margin: 12px 0 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--c-fog);
}

.page-about .next-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 760px) {
  .page-about .recogn-item {
    grid-template-columns: 150px minmax(0, 1fr) 120px;
    align-items: center;
    gap: 22px;
  }

  .page-about .recogn-users {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 28px;
  }
}

@media (min-width: 860px) {
  .page-about .hero-layout {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 46px;
    align-items: start;
  }

  .page-about .hero-board {
    padding: 28px 24px 26px;
  }

  .page-about .origin-layout {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .source-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 22px;
    align-items: start;
  }

  .page-about .source-card:nth-child(2) {
    margin-top: 30px;
  }

  .page-about .source-card:nth-child(3) {
    margin-top: 12px;
  }

  .page-about .role {
    display: grid;
    grid-template-columns: 236px minmax(0, 1fr);
    gap: 30px;
    align-items: start;
    padding: 28px 0;
  }

  .page-about .role:nth-child(even) {
    padding-left: 8%;
  }

  .page-about .role:nth-child(odd) {
    padding-right: 4%;
  }

  .page-about .role-head {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }

  .page-about .role-body {
    margin-top: 0;
  }
}

@media (min-width: 920px) {
  .page-about .growth-body {
    grid-template-columns: 118px minmax(0, 1fr);
    gap: 46px;
    align-items: start;
  }

  .page-about .season-rail {
    position: sticky;
    top: calc(var(--header-h) + 26px);
    overflow: visible;
    padding-bottom: 0;
    height: max-content;
  }

  .page-about .season-rail__list {
    flex-direction: column;
    align-items: flex-start;
    gap: 44px;
  }

  .page-about .season-list {
    padding-left: 0;
    border-left: 0;
    gap: 18px;
  }

  .page-about .season-item {
    padding: 22px 24px 24px;
  }

  .page-about .eco-layout {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    gap: 56px;
    align-items: center;
  }

  .page-about .eco-visual {
    justify-self: end;
    max-width: 420px;
  }

  .page-about .next-layout {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, .88fr);
    gap: 56px;
    align-items: start;
  }
}

@media (min-width: 1140px) {
  .page-about .role {
    grid-template-columns: 268px minmax(0, 1fr);
  }

  .page-about .eco-visual {
    max-width: 460px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .season-item,
  .page-about .role-note,
  .page-about .eco-item,
  .page-about .eco-layer circle {
    transition: none;
  }

  .page-about .season-item:hover,
  .page-about .role:hover .role-note,
  .page-about .role:focus-within .role-note {
    transform: none;
  }
}