.page-about {
  --about-rail-w: 186px;
  background: var(--ink-900);
}

/* ── 首屏 ───────────────────────────────────── */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: calc(var(--header-h) + 3.25rem) 0 2.5rem;
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(660px 300px at 10% -12%, rgba(51, 225, 225, .13), transparent 70%),
    radial-gradient(520px 280px at 92% 6%, rgba(255, 122, 47, .09), transparent 74%);
}

.page-about .about-hero > .wrap {
  position: relative;
}

.page-about .about-hero .eyebrow {
  color: var(--cyan);
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.35rem, 7.6vw, 5rem);
  line-height: 1.04;
  letter-spacing: .01em;
  color: var(--text);
  margin: .6rem 0 1.15rem;
  max-width: 16em;
}

.page-about .about-hero .lede {
  color: var(--muted);
  font-size: clamp(1rem, 1.6vw, 1.1rem);
  line-height: 1.8;
  max-width: 40em;
}

/* ── 赛季跨度条 ─────────────────────────────── */
.page-about .season-ruler {
  list-style: none;
  margin: 2.75rem 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  position: relative;
}

.page-about .season-ruler::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 6px;
  height: 2px;
  background: linear-gradient(90deg,
    rgba(51, 225, 225, .55),
    rgba(242, 179, 61, .5) 48%,
    rgba(182, 52, 126, .75));
}

.page-about .season-node {
  position: relative;
  padding-top: 26px;
  min-width: 0;
}

.page-about .season-node::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 2px solid var(--cyan);
  box-sizing: border-box;
}

.page-about .season-node--now::before {
  background: var(--plum);
  border-color: var(--magenta);
  box-shadow: 0 0 0 4px rgba(182, 52, 126, .22);
}

.page-about .season-node__tag {
  display: block;
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .12em;
  color: var(--text);
}

.page-about .season-node__cap {
  display: block;
  margin-top: .25rem;
  font-size: .72rem;
  line-height: 1.4;
  color: var(--muted);
}

/* ── 正文骨架 ───────────────────────────────── */
.page-about .about-body {
  padding: clamp(2.5rem, 6vw, 4.25rem) 0 var(--section-y);
}

.page-about .about-body__inner {
  display: grid;
  gap: 1.5rem;
}

@media (min-width: 1000px) {
  .page-about .about-body__inner {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: 3.75rem;
    align-items: start;
  }
}

/* ── 左侧索引 ───────────────────────────────── */
.page-about .about-rail__title {
  margin: 0 0 .7rem;
  font-size: .74rem;
  letter-spacing: .18em;
  color: var(--ink-600);
  text-transform: uppercase;
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0 0 .6rem;
  display: flex;
  gap: .4rem;
  overflow-x: auto;
  scrollbar-width: none;
}

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

.page-about .about-rail__link {
  display: flex;
  align-items: center;
  gap: .5rem;
  padding: .5rem .8rem;
  border: 1px solid transparent;
  border-radius: var(--r-pill);
  font-size: .88rem;
  color: var(--muted);
  text-decoration: none;
  white-space: nowrap;
  transition: color .2s ease, border-color .2s ease, background-color .2s ease;
}

.page-about .about-rail__link .mono {
  font-size: .7rem;
  letter-spacing: .08em;
  color: var(--ink-600);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--text);
  border-color: var(--line);
}

.page-about .about-rail__link.is-active {
  color: var(--cyan);
  background: var(--cyan-soft);
  border-color: rgba(51, 225, 225, .45);
}

.page-about .about-rail__link.is-active .mono {
  color: rgba(51, 225, 225, .75);
}

@media (min-width: 1000px) {
  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h-solid) + 2rem);
  }

  .page-about .about-rail__list {
    flex-direction: column;
    gap: .15rem;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-rail__link {
    border-radius: 14px 10px 14px 10px;
    justify-content: flex-start;
  }
}

/* ── 阶段区块 ───────────────────────────────── */
.page-about .about-stages {
  min-width: 0;
}

.page-about .stage {
  padding-block: clamp(2rem, 4.6vw, 3.25rem);
  border-top: 1px solid var(--line);
}

.page-about .stage:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .stage--closing {
  padding-bottom: 0;
}

.page-about .stage__grid {
  display: grid;
  gap: .85rem;
}

@media (min-width: 720px) {
  .page-about .stage__grid {
    grid-template-columns: 78px minmax(0, 1fr);
    gap: 2.25rem;
  }
}

.page-about .stage__num {
  font-family: var(--font-mono);
  font-size: 1.9rem;
  font-weight: 700;
  line-height: 1;
  letter-spacing: .04em;
  color: var(--ink-600);
}

@media (min-width: 720px) {
  .page-about .stage__num {
    position: sticky;
    top: calc(var(--header-h-solid) + 2rem);
    font-size: 2.5rem;
  }
}

.page-about .stage__main {
  min-width: 0;
}

.page-about .stage__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.42rem, 3.4vw, 2.05rem);
  line-height: 1.18;
  letter-spacing: .01em;
  color: var(--text);
  margin: 0 0 .9rem;
}

.page-about .stage__text {
  margin: 0;
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.82;
  max-width: 38em;
}

.page-about .stage__text + .stage__text {
  margin-top: .9rem;
}

.page-about .stage__link {
  margin: 1.6rem 0 0;
  font-size: .95rem;
  color: var(--muted);
}

.page-about .stage__link a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(51, 225, 225, .4);
}

.page-about .stage__link a:hover,
.page-about .stage__link a:focus-visible {
  border-bottom-color: var(--cyan);
}

.page-about .stage__cta {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  margin: 2rem 0 0;
}

/* ── 数字组 ─────────────────────────────────── */
.page-about .figures {
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem 2.5rem;
  margin-top: 1.75rem;
  padding-top: 1.35rem;
  border-top: 1px dashed rgba(147, 167, 190, .2);
}

.page-about .figure {
  min-width: 5.5rem;
}

.page-about .figure__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.8rem;
  line-height: 1;
  color: var(--cyan);
}

.page-about .figure__num--orange {
  color: var(--orange);
}

.page-about .figure__num--gold {
  color: var(--gold);
}

.page-about .figure__num--plum {
  color: var(--magenta);
}

.page-about .figure__cap {
  display: block;
  margin-top: .45rem;
  font-size: .76rem;
  letter-spacing: .05em;
  line-height: 1.45;
  color: var(--muted);
}

/* ── 图片 ───────────────────────────────────── */
.page-about .shot {
  margin: 1.75rem 0 0;
  border-radius: var(--r-media);
  overflow: hidden;
  background: var(--ink-800);
  border: 1px solid var(--line);
}

.page-about .shot--inline {
  margin-top: 1.85rem;
}

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

.page-about .shot figcaption {
  padding: .8rem 1.15rem .9rem;
  font-size: .8rem;
  line-height: 1.6;
  color: var(--muted);
  border-top: 1px solid var(--line);
}

.page-about .closing-shot {
  margin: clamp(2rem, 4.5vw, 3rem) 0 0;
  border-radius: var(--r-media);
  overflow: hidden;
  background: var(--ink-800);
  border: 1px solid var(--line);
}

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

.page-about .closing-shot figcaption {
  padding: .8rem 1.15rem .9rem;
  font-size: .8rem;
  line-height: 1.6;
  color: var(--muted);
  border-top: 1px solid var(--line);
}

/* ── 团队角色 ───────────────────────────────── */
.page-about .roles {
  display: grid;
  gap: .55rem;
  margin-top: 1.6rem;
}

.page-about .role {
  background: var(--ink-800);
  border: 1px solid var(--line);
  border-radius: 20px 13px 20px 13px;
  overflow: hidden;
  transition: border-color .22s ease, background-color .22s ease;
}

.page-about .role[open] {
  border-color: rgba(51, 225, 225, .42);
}

.page-about .role__head {
  display: flex;
  align-items: center;
  gap: .75rem;
  padding: 1rem 1.2rem;
  cursor: pointer;
  list-style: none;
  color: var(--text);
  font-size: .97rem;
  font-weight: 500;
}

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

.page-about .role__head::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 1.15rem;
  line-height: 1;
  color: var(--cyan);
  transition: transform .22s ease;
}

.page-about .role[open] .role__head::after {
  transform: rotate(45deg);
}

.page-about .role__head:hover {
  background: rgba(51, 225, 225, .05);
}

.page-about .role__dot {
  flex: 0 0 auto;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--cyan);
}

.page-about .role__dot--orange {
  background: var(--orange);
}

.page-about .role__dot--gold {
  background: var(--gold);
}

.page-about .role__meta {
  font-size: .8rem;
  color: var(--muted);
  letter-spacing: .04em;
}

.page-about .role__head::after {
  flex: 0 0 auto;
}

.page-about .role__body {
  margin: 0;
  padding: 0 1.2rem 1.15rem 2.05rem;
  font-size: .92rem;
  line-height: 1.78;
  color: var(--muted);
}

/* ── 合作生态筛选 ───────────────────────────── */
.page-about .filter-bar {
  margin-top: 1.5rem;
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
}

.page-about .partner-grid {
  display: grid;
  gap: .8rem;
  margin-top: 1.5rem;
}

@media (min-width: 640px) {
  .page-about .partner-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1180px) {
  .page-about .partner-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .partner-card {
  display: flex;
  flex-direction: column;
  gap: .55rem;
  padding: 1.2rem 1.3rem 1.3rem;
  background: var(--ink-800);
  border: 1px solid var(--line);
  border-radius: var(--r-card);
  transition: border-color .22s ease, transform .22s ease;
}

.page-about .partner-card:hover {
  border-color: rgba(51, 225, 225, .45);
  transform: translateY(-3px);
}

.page-about .partner-card[hidden] {
  display: none;
}

.page-about .partner-card__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.12rem;
  font-weight: 600;
  line-height: 1.3;
  color: var(--text);
}

.page-about .partner-card__text {
  margin: 0;
  font-size: .9rem;
  line-height: 1.72;
  color: var(--muted);
}

/* ── 承诺清单 ───────────────────────────────── */
.page-about .pledge-list {
  list-style: none;
  margin: 1.75rem 0 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .pledge {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 1rem;
  padding: 1.25rem 0;
  border-top: 1px solid var(--line);
}

.page-about .pledge:first-child {
  border-top: 0;
  padding-top: .35rem;
}

.page-about .pledge__key {
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.5;
  color: var(--cyan);
}

.page-about .pledge__body {
  min-width: 0;
}

.page-about .pledge__title {
  margin: 0 0 .4rem;
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 600;
  line-height: 1.3;
  color: var(--text);
}

.page-about .pledge__text {
  margin: 0;
  font-size: .95rem;
  line-height: 1.78;
  color: var(--muted);
  max-width: 36em;
}

.page-about .pledge__text a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(51, 225, 225, .4);
}

.page-about .pledge__text a:hover,
.page-about .pledge__text a:focus-visible {
  border-bottom-color: var(--cyan);
}

/* ── 窄屏收束 ───────────────────────────────── */
@media (max-width: 560px) {
  .page-about .about-hero {
    padding-top: calc(var(--header-h) + 2rem);
  }

  .page-about .season-node__cap {
    font-size: .66rem;
  }

  .page-about .season-node__tag {
    font-size: .72rem;
  }

  .page-about .figures {
    gap: 1.1rem 1.75rem;
  }

  .page-about .figure__num {
    font-size: 1.55rem;
  }

  .page-about .role__body {
    padding-left: 1.2rem;
  }

  .page-about .pledge {
    grid-template-columns: 24px minmax(0, 1fr);
    gap: .75rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .partner-card,
  .page-about .about-rail__link,
  .page-about .role__head::after {
    transition: none;
  }
}
<<<END>>>