.page-about {
  --about-axis: #B4562F;
  --about-gap: clamp(14px, 2.2vw, 24px);
  --about-band-y: clamp(34px, 5vw, 66px);
  background: var(--cream);
  color: var(--stone);
  font-family: var(--font-body);
  overflow-x: hidden;
}

.page-about .container {
  max-width: var(--wrap);
  margin: 0 auto;
  padding-left: var(--gutter);
  padding-right: var(--gutter);
}

.page-about section[id] {
  scroll-margin-top: 130px;
}

/* ---------- 面包屑补充 ---------- */
.page-about .breadcrumb {
  padding-top: clamp(14px, 2vw, 24px);
  padding-bottom: 4px;
  font-size: 13px;
  letter-spacing: .02em;
}
.page-about .breadcrumb ol {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  color: var(--stone);
}
.page-about .breadcrumb li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--line);
}
.page-about .breadcrumb a {
  color: var(--moss);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}
.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  border-bottom-color: var(--orange);
}

/* ---------- 章节锚点 ---------- */
.page-about .about-rail {
  display: none;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: clamp(22px, 3.6vw, 46px) 0 clamp(28px, 4.4vw, 56px);
  background:
    linear-gradient(180deg, rgba(226, 87, 27, .05) 0%, rgba(246, 242, 232, 0) 62%);
}
.page-about .about-hero__grid {
  display: grid;
  gap: var(--about-gap);
  grid-template-columns: 1fr;
}
.page-about .about-hero__copy .eyebrow {
  margin: 0 0 10px;
  font-size: 13px;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--orange);
  font-weight: 700;
}
.page-about .about-hero h1 {
  margin: 0 0 clamp(14px, 2vw, 22px);
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(30px, 6.4vw, 56px);
  line-height: 1.06;
  letter-spacing: -.02em;
  color: var(--ink);
  text-wrap: balance;
}
.page-about .about-hero__lede {
  margin: 0 0 clamp(18px, 2.6vw, 28px);
  font-size: clamp(15px, 1.6vw, 18px);
  line-height: 1.75;
  max-width: 40rem;
  color: var(--stone);
}
.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-hero__panel {
  background: var(--ink);
  color: var(--cream);
  border-radius: var(--radius);
  padding: clamp(18px, 2.4vw, 26px);
  border: 1px solid var(--ink-line-strong);
  border-top: 3px solid var(--orange);
  box-shadow: var(--shadow);
}
.page-about .about-hero__panel-title {
  margin: 0 0 14px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 18px;
  letter-spacing: .02em;
  color: var(--amber);
}
.page-about .about-hero__roster {
  list-style: none;
  margin: 0 0 14px;
  padding: 0;
}
.page-about .about-hero__roster li {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 9px 0;
  border-bottom: 1px solid var(--ink-line);
  font-size: 14px;
}
.page-about .about-hero__roster li:last-child {
  border-bottom: none;
}
.page-about .about-hero__role {
  color: var(--ink-text);
}
.page-about .about-hero__count {
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
  color: var(--amber);
  line-height: 1;
}
.page-about .about-hero__panel-note {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-text-dim);
}

/* ---------- 数字带 ---------- */
.page-about .num-band {
  background: var(--ink-2);
  border-top: 3px solid var(--orange);
  border-bottom: 1px solid var(--ink-line-strong);
  padding: clamp(24px, 3.4vw, 42px) 0;
}
.page-about .num-band__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--ink-line);
  border: 1px solid var(--ink-line);
}
.page-about .num-band__item {
  background: var(--ink-2);
  padding: clamp(14px, 2vw, 22px) clamp(12px, 1.6vw, 18px);
}
.page-about .num-band__num {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(28px, 4.4vw, 42px);
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--amber);
}
.page-about .num-band__unit {
  font-size: .42em;
  margin-left: 4px;
  color: var(--orange-soft);
  letter-spacing: 0;
}
.page-about .num-band__label {
  margin: 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--ink-text);
}

/* ---------- 通用区块 ---------- */
.page-about .about-band {
  padding: var(--about-band-y) 0;
}
.page-about .about-band--paper {
  background: var(--paper-dim);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.page-about .about-band--white {
  background: var(--paper);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.page-about .about-band--ink {
  background: var(--ink);
  color: var(--cream);
}

.page-about .section-head {
  max-width: 46rem;
  margin-bottom: clamp(22px, 3.4vw, 40px);
}
.page-about .section-head .eyebrow {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: .08em;
  text-transform: uppercase;
  font-weight: 700;
  color: var(--moss);
}
.page-about .section-head h2 {
  margin: 0 0 12px;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(23px, 3.4vw, 34px);
  line-height: 1.14;
  letter-spacing: -.015em;
  color: var(--ink);
  text-wrap: balance;
}
.page-about .about-lede {
  margin: 0;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.75;
  color: var(--stone);
}
.page-about .section-head--invert .eyebrow--invert {
  color: var(--orange-soft);
}
.page-about .section-head--invert h2 {
  color: var(--cream);
}
.page-about .about-lede--invert {
  color: var(--ink-text);
}

/* ---------- 流程 ---------- */
.page-about .flow__list {
  list-style: none;
  margin: 0 0 clamp(22px, 3.4vw, 40px);
  padding: 0;
  display: grid;
  gap: var(--about-gap);
  grid-template-columns: 1fr;
}
.page-about .flow__step {
  position: relative;
  padding: 16px 16px 18px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-top: 2px solid var(--line);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow);
  transition: border-top-color .14s ease, box-shadow .14s ease, transform .14s ease;
}
.page-about .flow__step:hover {
  border-top-color: var(--orange);
  box-shadow: var(--shadow-lift);
  transform: translateY(-2px);
}
.page-about .flow__step-index {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .06em;
  color: var(--orange);
  margin-bottom: 8px;
}
.page-about .flow__step-title {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 17px;
  line-height: 1.3;
  letter-spacing: -.01em;
  color: var(--ink);
}
.page-about .flow__step-body {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--stone);
}

.page-about .flow__figure {
  margin: 0;
  background: var(--ink);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  overflow: hidden;
}
.page-about .flow__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 3 / 2;
}
.page-about .flow__caption {
  padding: 12px 16px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--ink-text);
  background: var(--ink);
  border-top: 1px solid var(--ink-line);
}

/* ---------- 赛季演进 ---------- */
.page-about .season {
  position: relative;
  padding-left: 30px;
}
.page-about .season::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: var(--about-axis);
  opacity: .55;
}
.page-about .season-node {
  position: relative;
  padding-bottom: 10px;
}
.page-about .season-node::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 9px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--amber);
  box-shadow: 0 0 0 3px var(--paper-dim);
}
.page-about .season-node__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  padding: 4px 0 8px;
  cursor: pointer;
  list-style: none;
}
.page-about .season-node__head::-webkit-details-marker {
  display: none;
}
.page-about .season-node__head:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 3px;
}
.page-about .season-node__year {
  font-family: var(--font-mono);
  font-size: clamp(18px, 2.4vw, 24px);
  font-weight: 700;
  line-height: 1;
  color: var(--orange);
}
.page-about .season-node__title {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(16px, 1.9vw, 19px);
  letter-spacing: -.01em;
  color: var(--ink);
}
.page-about .season-node__toggle {
  margin-left: auto;
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--moss);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 2px 10px;
  white-space: nowrap;
}
.page-about .season-node:not([open]) .season-node__toggle::after {
  content: "展开";
}
.page-about .season-node[open] .season-node__toggle::after {
  content: "收起";
}
.page-about .season-node__body {
  margin: 0 0 8px;
  padding: 12px 14px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--stone);
  background: var(--paper);
  border: 1px solid var(--line);
  border-left: 3px solid var(--about-axis);
  border-radius: var(--radius-sm);
}
.page-about .season__tail {
  margin: clamp(16px, 2.4vw, 26px) 0 0;
  padding-left: 30px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--stone);
}
.page-about .season__tail a {
  color: var(--orange);
  font-weight: 700;
  text-decoration: none;
  border-bottom: 1px solid var(--orange-soft);
}
.page-about .season__tail a:hover,
.page-about .season__tail a:focus-visible {
  border-bottom-color: var(--orange);
}

/* ---------- 团队 ---------- */
.page-about .team-intro {
  display: grid;
  gap: var(--about-gap);
  grid-template-columns: 1fr;
  margin-bottom: clamp(24px, 3.6vw, 42px);
}
.page-about .team-intro__figure {
  margin: 0;
  background: var(--ink);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  overflow: hidden;
}
.page-about .team-intro__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 14 / 9;
}
.page-about .team-intro__copy p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--stone);
}
.page-about .team-intro__copy p:last-child {
  margin-bottom: 0;
}

.page-about .role-grid {
  display: grid;
  gap: var(--about-gap);
  grid-template-columns: 1fr;
}
.page-about .role-card {
  background: var(--cream);
  border: 1px solid var(--line);
  border-top: 3px solid var(--orange);
  border-radius: var(--radius-sm);
  padding: 18px 16px 16px;
  box-shadow: var(--shadow);
  transition: box-shadow .14s ease, transform .14s ease, background .14s ease;
}
.page-about .role-card:hover,
.page-about .role-card:focus-within {
  box-shadow: var(--shadow-lift);
  transform: translateY(-3px);
  background: var(--paper);
}
.page-about .role-card__count {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 34px;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--ink);
}
.page-about .role-card__count span {
  font-size: .38em;
  margin-left: 4px;
  color: var(--orange);
}
.page-about .role-card__name {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 18px;
  letter-spacing: -.01em;
  color: var(--ink);
}
.page-about .role-card__desc {
  margin: 0 0 12px;
  font-size: 14px;
  line-height: 1.72;
  color: var(--stone);
}
.page-about .role-card__lines {
  margin: 0;
  padding-top: 10px;
  border-top: 1px dashed var(--line);
  font-size: 12.5px;
  letter-spacing: .02em;
  line-height: 1.6;
  color: var(--moss);
  transition: color .14s ease;
}
.page-about .role-card:hover .role-card__lines {
  color: var(--orange);
}

/* ---------- 合作生态 ---------- */
.page-about .partners-grid {
  display: grid;
  gap: var(--about-gap);
  grid-template-columns: 1fr;
}
.page-about .partners-list {
  list-style: none;
  margin: 0 0 clamp(18px, 2.4vw, 26px);
  padding: 0;
}
.page-about .partners-list__item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 14px;
  align-items: start;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}
.page-about .partners-list__item:first-child {
  border-top: 1px solid var(--line);
}
.page-about .partners-list__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(26px, 3.6vw, 36px);
  line-height: 1;
  color: var(--amber);
  background: var(--ink);
  border-radius: var(--radius-sm);
  padding: 6px 10px;
  min-width: 2.4em;
  text-align: center;
}
.page-about .partners-list__title {
  margin: 0 0 6px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 17px;
  letter-spacing: -.01em;
  color: var(--ink);
}
.page-about .partners-list__body {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--stone);
}
.page-about .partners-honor {
  margin: 0;
  padding: 14px 16px;
  font-size: 14px;
  line-height: 1.72;
  color: var(--ink);
  background: rgba(245, 179, 36, .18);
  border-left: 3px solid var(--amber);
  border-radius: var(--radius-sm);
}
.page-about .partners-grid__figure {
  margin: 0;
  background: var(--ink);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  overflow: hidden;
}
.page-about .partners-grid__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 22 / 15;
}

/* ---------- 数据园 ---------- */
.page-about .campus__grid {
  display: grid;
  gap: var(--about-gap);
  grid-template-columns: 1fr;
}
.page-about .campus__note {
  border: 1px solid var(--ink-line-strong);
  border-left: 3px solid var(--orange);
  border-radius: var(--radius-sm);
  padding: 18px 16px;
  background: rgba(217, 209, 192, .04);
  transition: background .14s ease, transform .14s ease;
}
.page-about .campus__note:hover {
  background: rgba(217, 209, 192, .09);
  transform: translateY(-2px);
}
.page-about .campus__note-title {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 17px;
  letter-spacing: -.01em;
  color: var(--cream);
}
.page-about .campus__note-body {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-text);
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  background: var(--orange);
  color: #FFFFFF;
  border-top: 3px solid var(--amber);
  border-bottom: 3px solid var(--ink);
  padding: clamp(34px, 5.4vw, 68px) 0;
}
.page-about .about-cta__inner {
  display: grid;
  gap: clamp(18px, 2.6vw, 30px);
  grid-template-columns: 1fr;
  align-items: center;
}
.page-about .about-cta__copy h2 {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(22px, 3.4vw, 32px);
  line-height: 1.14;
  letter-spacing: -.015em;
  color: #FFFFFF;
}
.page-about .about-cta__copy p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  max-width: 42rem;
  color: rgba(255, 255, 255, .9);
}
.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
.page-about .about-cta__btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 22px;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .03em;
  text-decoration: none;
  border-radius: var(--radius);
  transition: background .14s ease, color .14s ease, border-color .14s ease, transform .12s ease;
}
.page-about .about-cta__btn--solid {
  background: var(--ink);
  color: var(--cream);
  border: 1px solid var(--ink);
}
.page-about .about-cta__btn--solid:hover,
.page-about .about-cta__btn--solid:focus-visible {
  background: #0A1A14;
  transform: translateY(-1px);
}
.page-about .about-cta__btn--line {
  background: transparent;
  color: #FFFFFF;
  border: 1px solid rgba(255, 255, 255, .75);
}
.page-about .about-cta__btn--line:hover,
.page-about .about-cta__btn--line:focus-visible {
  background: rgba(255, 255, 255, .14);
  border-color: #FFFFFF;
  transform: translateY(-1px);
}

/* ---------- 显现动效 ---------- */
.page-about [data-reveal] {
  opacity: 1;
}
.page-about .js [data-reveal] {
  opacity: 0;
  transform: translateY(10px);
  transition: opacity .24s ease, transform .24s ease;
}
.page-about .js [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-about .num-band__grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .page-about .role-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .page-about .campus__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: 1.5fr .85fr;
    align-items: end;
  }
  .page-about .flow__list {
    grid-template-columns: repeat(3, 1fr);
  }
  .page-about .team-intro {
    grid-template-columns: 1.15fr .85fr;
    align-items: center;
  }
  .page-about .partners-grid {
    grid-template-columns: 1.2fr .8fr;
    align-items: start;
  }
  .page-about .campus__grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .page-about .about-cta__inner {
    grid-template-columns: 1.4fr auto;
  }
}

@media (min-width: 1100px) {
  .page-about .role-grid {
    grid-template-columns: repeat(4, 1fr);
  }
  .page-about .num-band__grid {
    grid-template-columns: repeat(5, 1fr);
  }
  .page-about .flow__list {
    grid-template-columns: repeat(5, 1fr);
  }
}

@media (min-width: 1440px) {
  .page-about .about-rail {
    display: block;
    position: fixed;
    right: 22px;
    top: 50%;
    transform: translateY(-50%);
    z-index: 20;
  }
  .page-about .about-rail__list {
    list-style: none;
    margin: 0;
    padding: 10px 8px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    background: rgba(246, 242, 232, .86);
    border: 1px solid var(--line);
    border-radius: 999px;
    backdrop-filter: blur(2px);
  }
  .page-about .about-rail__link {
    display: flex;
    align-items: center;
    gap: 7px;
    font-size: 12px;
    letter-spacing: .02em;
    color: var(--stone);
    text-decoration: none;
    padding: 3px 4px;
    border-radius: 4px;
  }
  .page-about .about-rail__dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--line);
    flex: none;
    transition: background .14s ease, transform .14s ease;
  }
  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    color: var(--ink);
  }
  .page-about .about-rail__link:hover .about-rail__dot,
  .page-about .about-rail__link:focus-visible .about-rail__dot {
    background: var(--orange);
    transform: scale(1.5);
  }
}

@media (max-width: 420px) {
  .page-about .num-band__grid {
    grid-template-columns: 1fr;
  }
  .page-about .partners-list__item {
    grid-template-columns: 1fr;
  }
  .page-about .partners-list__num {
    justify-self: start;
  }
}