.page-about {
  --about-rail: 210px;
  --about-cyan-line: linear-gradient(90deg, rgba(53, 242, 214, 0) 0%, rgba(53, 242, 214, .6) 50%, rgba(53, 242, 214, 0) 100%);
  min-width: 0;
}

.page-about__crumb {
  padding-block: clamp(1rem, 2.5vw, 1.6rem) 0;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: clamp(1.25rem, 3vw, 2.25rem);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(1.25rem, 3vw, 2.25rem);
  align-items: center;
  min-width: 0;
}

.page-about .about-hero__title {
  margin: .5rem 0 0;
  font-size: clamp(1.95rem, 6.2vw, 4rem);
  line-height: 1.14;
  font-weight: 900;
  letter-spacing: -.02em;
  color: var(--c-text);
}

.page-about .about-hero__lede {
  margin: 1.1rem 0 0;
  max-width: 62ch;
  font-size: var(--fs-17);
  line-height: var(--lh-body);
  color: var(--c-text);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  margin-top: 1.6rem;
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
  border-radius: var(--r-md);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(1.75rem, 4vw, 2.75rem);
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .about-hero__stats .stat {
  display: flex;
  flex-direction: column;
  gap: .1rem;
  padding: 1.05rem 1.1rem 1.2rem;
  background: var(--c-panel);
}

.page-about .about-hero__stats .stat__value {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.75rem, 4.6vw, 2.5rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--c-cyan);
}

.page-about .about-hero__stats .stat--orange .stat__value {
  color: var(--c-orange);
}

.page-about .about-hero__stats .stat__unit {
  font-size: var(--fs-12);
  letter-spacing: .12em;
  color: var(--c-muted);
}

.page-about .about-hero__stats .stat__label {
  margin-top: .3rem;
  font-size: var(--fs-14);
  line-height: 1.5;
  color: var(--c-text);
}

/* ---------- 侧栏 + 正文骨架 ---------- */
.page-about .about-layout {
  display: grid;
  gap: clamp(1.5rem, 4vw, 3rem);
  padding-block: clamp(2rem, 5vw, 3.5rem);
  min-width: 0;
}

.page-about .about-rail {
  align-self: start;
}

.page-about .about-rail__label {
  margin: 0 0 .7rem;
  font-size: var(--fs-12);
  letter-spacing: .16em;
  color: var(--c-muted);
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0 0 .35rem;
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: max-content;
  gap: .35rem;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-rail__link {
  display: flex;
  align-items: baseline;
  gap: .5rem;
  padding: .5rem .65rem;
  border-bottom: 2px solid transparent;
  border-radius: var(--r-sm);
  color: var(--c-muted);
  font-size: var(--fs-14);
  white-space: nowrap;
  text-decoration: none;
  transition: color var(--dur), background var(--dur), border-color var(--dur);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--c-text);
  background: var(--glass);
  border-bottom-color: var(--c-cyan);
}

.page-about .about-rail__num {
  font-size: var(--fs-12);
  letter-spacing: .08em;
  color: var(--c-cyan);
}

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

/* ---------- 章节 ---------- */
.page-about .about-chapter {
  padding-block: clamp(2rem, 5vw, 3.25rem);
  border-top: 1px solid var(--line);
}

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

.page-about .about-chapter__head {
  max-width: 68ch;
}

.page-about .about-chapter__num {
  margin: 0 0 .3rem;
  font-size: clamp(2.35rem, 7.5vw, 4.25rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.04em;
  color: rgba(53, 242, 214, .32);
}

.page-about .about-chapter__title {
  margin: .3rem 0 0;
  font-size: clamp(1.45rem, 3.4vw, 2.3rem);
  line-height: 1.24;
  font-weight: 900;
  letter-spacing: -.02em;
  color: var(--c-text);
}

.page-about .about-chapter__lede {
  margin: .9rem 0 0;
  max-width: 64ch;
  font-size: var(--fs-17);
  line-height: var(--lh-body);
  color: var(--c-text);
}

/* ---------- 01 轮换清单 ---------- */
.page-about .rotation-list {
  list-style: none;
  margin: clamp(1.5rem, 3vw, 2.25rem) 0 0;
  padding: 0;
  display: grid;
  gap: .7rem;
}

.page-about .rotation-item {
  position: relative;
}

.page-about .rotation-item__check {
  position: absolute;
  top: 1.1rem;
  right: 1.1rem;
  z-index: 2;
  width: 1.35rem;
  height: 1.35rem;
  margin: 0;
  appearance: none;
  -webkit-appearance: none;
  border: 1.5px solid rgba(124, 140, 180, .55);
  border-radius: 4px;
  background: transparent;
  cursor: pointer;
  transition: background var(--dur), border-color var(--dur), box-shadow var(--dur);
}

.page-about .rotation-item__check:checked {
  background: var(--c-cyan);
  border-color: var(--c-cyan);
  box-shadow: var(--glow-cyan);
}

.page-about .rotation-item__check:focus-visible {
  outline: 2px solid var(--c-orange);
  outline-offset: 3px;
}

.page-about .rotation-item__label {
  display: block;
  padding: 1.1rem 3.2rem 1.2rem 1.15rem;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--c-panel);
  cursor: pointer;
  transition: border-color var(--dur), background var(--dur);
}

.page-about .rotation-item__label:hover {
  border-color: var(--line-strong);
}

.page-about .rotation-item__idx {
  display: block;
  margin-bottom: .35rem;
  font-size: var(--fs-12);
  letter-spacing: .16em;
  color: var(--c-cyan);
}

.page-about .rotation-item__title {
  display: block;
  font-size: var(--fs-22);
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--c-text);
}

.page-about .rotation-item__desc {
  display: block;
  margin-top: .45rem;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(221, 231, 245, .74);
}

.page-about .rotation-item__check:checked + .rotation-item__label {
  border-color: var(--line-strong);
  background: linear-gradient(180deg, rgba(53, 242, 214, .10), rgba(53, 242, 214, .01)), var(--c-panel);
}

.page-about .rotation-item__check:checked + .rotation-item__label .rotation-item__title {
  color: var(--c-cyan);
}

/* ---------- 02 赛季分段 ---------- */
.page-about .seg-track {
  list-style: none;
  margin: clamp(1.5rem, 3vw, 2.25rem) 0 0;
  padding: 0;
  display: grid;
  gap: 1rem;
}

.page-about .seg-node {
  position: relative;
  padding: 1.35rem 1.2rem 1.5rem;
  border: 1px solid rgba(53, 242, 214, .16);
  border-radius: var(--r-md);
  background: var(--c-teal);
}

.page-about .seg-node__dot {
  display: block;
  width: .7rem;
  height: .7rem;
  margin-bottom: .85rem;
  border-radius: 50%;
  background: var(--c-cyan);
  box-shadow: var(--glow-cyan);
}

.page-about .seg-node__rounds {
  margin: 0;
  font-size: var(--fs-12);
  letter-spacing: .14em;
  color: var(--c-cyan);
}

.page-about .seg-node__title {
  margin: .4rem 0 0;
  font-size: var(--fs-22);
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--c-text);
}

.page-about .seg-node__body {
  margin: .6rem 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(221, 231, 245, .84);
}

.page-about .about-seg-media {
  margin: clamp(1.5rem, 3vw, 2.25rem) 0 0;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .about-seg-media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 21 / 9;
  object-fit: cover;
}

/* ---------- 03 登记流程 ---------- */
.page-about .about-flow {
  list-style: none;
  margin: clamp(1.5rem, 3vw, 2.25rem) 0 0;
  padding: 0;
}

.page-about .about-flow .timeline__item {
  position: relative;
  padding: 0 0 1.75rem 1.75rem;
  border-left: 1px solid var(--line);
}

.page-about .about-flow .timeline__item:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}

.page-about .about-flow .timeline__item::before {
  content: "";
  position: absolute;
  left: -5px;
  top: .5rem;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--c-cyan);
  box-shadow: var(--glow-cyan);
}

.page-about .about-flow .timeline__time {
  margin: 0;
  font-size: var(--fs-12);
  letter-spacing: .14em;
  color: var(--c-cyan);
}

.page-about .about-flow h3 {
  margin: .35rem 0 0;
  font-size: var(--fs-17);
  font-weight: 800;
  color: var(--c-text);
}

.page-about .about-flow p {
  margin: .4rem 0 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(221, 231, 245, .74);
}

.page-about .about-flow__foot {
  margin: 1.25rem 0 0;
  padding: .9rem 1.1rem;
  border-left: 2px solid var(--c-orange);
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
  background: var(--glass);
  font-size: 15px;
  line-height: 1.75;
  color: var(--c-text);
}

/* ---------- 04 团队 ---------- */
.page-about .about-team {
  margin-top: clamp(1.5rem, 3vw, 2.25rem);
  gap: 1rem;
}

.page-about .about-team__card {
  padding: 1.35rem 1.2rem 1.5rem;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--c-panel);
}

.page-about .about-team__num {
  margin: 0 0 .5rem;
  font-size: clamp(2.1rem, 5.6vw, 3.1rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.04em;
  color: var(--c-cyan);
}

.page-about .about-team__card .card__title {
  margin: 0;
  font-size: var(--fs-17);
  font-weight: 800;
  color: var(--c-text);
}

.page-about .about-team__card .card__body {
  margin: .55rem 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(221, 231, 245, .76);
}

/* ---------- 05 合作与认可 ---------- */
.page-about .about-partners {
  margin-top: clamp(1.5rem, 3vw, 2.25rem);
  align-items: start;
}

.page-about .about-partners__list {
  display: grid;
  gap: .85rem;
  min-width: 0;
}

.page-about .about-partner {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 1rem;
  padding: 1.1rem 1.15rem 1.2rem;
  border: 1px solid rgba(255, 211, 77, .18);
  border-radius: var(--r-md);
  background: var(--c-wine);
}

.page-about .about-partner__num {
  margin: 0;
  font-size: var(--fs-32);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--c-yellow);
}

.page-about .about-partner__title {
  margin: 0;
  font-size: var(--fs-17);
  font-weight: 800;
  color: var(--c-text);
}

.page-about .about-partner__desc {
  margin: .35rem 0 0;
  font-size: 15px;
  line-height: 1.78;
  color: rgba(221, 231, 245, .82);
}

.page-about .about-partners__media {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .about-partners__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 5 / 3;
  object-fit: cover;
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  padding-block: clamp(2rem, 5vw, 3.25rem);
}

.page-about .about-cta__inner {
  display: grid;
  gap: 1.25rem;
  padding: clamp(1.5rem, 4vw, 2.5rem);
  border: 1px solid var(--line-strong);
  border-radius: var(--r-lg);
}

.page-about .about-cta__title {
  margin: 0;
  font-size: clamp(1.3rem, 3vw, 1.95rem);
  font-weight: 900;
  letter-spacing: -.02em;
  color: var(--c-text);
}

.page-about .about-cta__text {
  margin: .6rem 0 0;
  max-width: 56ch;
  font-size: var(--fs-17);
  line-height: var(--lh-body);
  color: rgba(221, 231, 245, .78);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .7rem;
}

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

@media (min-width: 820px) {
  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 2rem;
  }
}

@media (min-width: 860px) {
  .page-about .seg-track {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.1rem;
  }

  .page-about .seg-node::after {
    content: "";
    position: absolute;
    left: 1.2rem;
    right: -1.1rem;
    top: 1.7rem;
    height: 1px;
    background: var(--about-cyan-line);
    pointer-events: none;
  }

  .page-about .seg-node:last-child::after {
    display: none;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: 7fr 5fr;
    gap: clamp(1.75rem, 4vw, 3rem);
  }
}

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

  .page-about .about-rail {
    position: sticky;
    top: 6.5rem;
  }

  .page-about .about-rail__list {
    grid-auto-flow: row;
    overflow: visible;
    padding-bottom: 0;
    gap: .2rem;
  }

  .page-about .about-rail__link {
    border-bottom: 0;
    border-left: 2px solid transparent;
    border-radius: 0 var(--r-sm) var(--r-sm) 0;
    white-space: normal;
  }

  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    border-left-color: var(--c-cyan);
    border-bottom-color: transparent;
  }
}