.page-about {
  --about-rail: 64px;
  --about-gap: clamp(14px, 2vw, 24px);
  position: relative;
  color: var(--c-chalk);
  overflow-x: clip;
  padding-bottom: clamp(40px, 6vw, 80px);
  background:
    radial-gradient(115% 62% at 6% -8%, rgba(53, 240, 208, .10), transparent 58%),
    radial-gradient(85% 52% at 94% 3%, rgba(255, 122, 61, .07), transparent 60%),
    var(--c-turf);
}

/* ---------- 开屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(18px, 3vw, 40px) 0 clamp(10px, 2vw, 22px);
}

.page-about .about-hero__inner {
  max-width: 960px;
}

.page-about .about-hero h1 {
  margin: 12px 0 20px;
}

.page-about .about-hero .lead {
  max-width: 64ch;
  color: var(--c-chalk);
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--about-gap);
  margin: clamp(26px, 4vw, 42px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-stats > li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0 6px;
  padding: 14px 16px;
  border-left: 2px solid var(--c-cyan);
  border-radius: 0 var(--radius) var(--radius) 0;
  background: linear-gradient(180deg, rgba(53, 240, 208, .08), rgba(53, 240, 208, .01));
}

.page-about .about-stats__value {
  font-size: var(--fs-34);
  line-height: 1;
  letter-spacing: .08em;
  color: var(--c-cyan);
  font-weight: 700;
}

.page-about .about-stats__value--orange { color: var(--c-orange); }
.page-about .about-stats__value--lime { color: var(--c-lime); }

.page-about .about-stats__unit {
  font-size: var(--fs-13);
  color: var(--c-mist);
}

.page-about .about-stats__label {
  flex-basis: 100%;
  margin-top: 6px;
  font-size: var(--fs-13);
  letter-spacing: .04em;
  color: var(--c-mist);
}

.page-about .about-hero__figure {
  margin: clamp(26px, 4vw, 48px) 0 0;
}

.page-about .about-hero__figure .figure__frame {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--line);
}

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

/* ---------- 立场 ---------- */
.page-about .about-why {
  padding-top: clamp(38px, 6vw, 74px);
}

.page-about .about-why__grid {
  display: grid;
  gap: clamp(22px, 3vw, 36px);
  grid-template-columns: 1fr;
}

.page-about .about-why__main h2 {
  margin: 10px 0 16px;
}

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

.page-about .about-why__list {
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 14px;
}

.page-about .about-why__list li {
  padding-left: 16px;
  position: relative;
  font-size: var(--fs-15);
  line-height: 1.7;
  color: var(--c-chalk);
}

.page-about .about-why__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .62em;
  width: 6px;
  height: 6px;
  background: var(--c-orange);
  transform: rotate(45deg);
}

.page-about .about-why__list strong {
  color: var(--c-cyan);
  font-weight: 700;
}

/* ---------- 城墙分隔 ---------- */
.page-about .bulwark {
  position: relative;
  height: 22px;
  margin: clamp(30px, 5vw, 62px) var(--gutter);
  opacity: .16;
}

.page-about .bulwark::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 8px;
  top: 0;
  background-image: repeating-linear-gradient(
    90deg,
    var(--c-stone) 0 16px,
    transparent 16px 34px
  );
}

.page-about .bulwark::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 8px;
  background: linear-gradient(90deg, transparent, var(--c-stone) 12%, var(--c-stone) 88%, transparent);
}

/* ---------- 赛季轨道 ---------- */
.page-about .about-seasons {
  padding-top: clamp(34px, 5vw, 56px);
}

.page-about .about-seasons .section-head__desc {
  max-width: 66ch;
}

.page-about .season-rail {
  position: relative;
  margin: clamp(28px, 4vw, 46px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .season-rail::before {
  content: "";
  position: absolute;
  left: 21px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(
    180deg,
    var(--c-cyan) 0%,
    rgba(53, 240, 208, .45) 32%,
    rgba(255, 122, 61, .55) 66%,
    rgba(201, 242, 77, .5) 100%
  );
  opacity: .55;
}

.page-about .season-rail__item {
  position: relative;
  display: grid;
  grid-template-columns: var(--about-rail) 1fr;
  gap: 12px;
  padding-bottom: clamp(20px, 2.6vw, 30px);
}

.page-about .season-rail__item:last-child { padding-bottom: 0; }

.page-about .season-rail__tick {
  position: relative;
  padding-top: 6px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 4px;
}

.page-about .season-rail__index {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  font-size: var(--fs-15);
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--c-turf);
  background: var(--c-cyan);
  box-shadow: 0 0 0 6px rgba(53, 240, 208, .10);
  transition: transform .28s ease, box-shadow .28s ease;
}

.page-about .season-rail__stage {
  display: none;
  font-size: var(--fs-13);
  letter-spacing: .12em;
  color: var(--c-mist);
  padding-left: 4px;
}

.page-about .season-rail__card {
  padding: clamp(16px, 2vw, 24px);
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: linear-gradient(150deg, rgba(20, 51, 42, .92), rgba(15, 58, 42, .62));
  transition: border-color .3s ease, transform .3s ease, background-color .3s ease;
}

.page-about .season-rail__title {
  margin: 0 0 12px;
  color: var(--c-chalk);
}

.page-about .season-rail__card p {
  margin: 0 0 10px;
  font-size: var(--fs-15);
  line-height: 1.75;
  color: var(--c-chalk);
  max-width: 68ch;
}

.page-about .season-rail__card p:last-child { margin-bottom: 0; }

.page-about .season-rail__item:hover .season-rail__card,
.page-about .season-rail__item:focus-within .season-rail__card {
  border-color: rgba(53, 240, 208, .45);
  background: linear-gradient(150deg, rgba(20, 51, 42, 1), rgba(15, 58, 42, .78));
}

.page-about .season-rail__item:hover .season-rail__index,
.page-about .season-rail__item:focus-within .season-rail__index {
  transform: translateY(-3px);
  box-shadow: 0 0 0 9px rgba(53, 240, 208, .16);
}

.page-about .season-rail__item:nth-child(2) .season-rail__index { background: var(--c-orange); color: var(--c-turf); box-shadow: 0 0 0 6px rgba(255, 122, 61, .12); }
.page-about .season-rail__item:nth-child(3) .season-rail__index { background: var(--c-lime); color: var(--c-turf); box-shadow: 0 0 0 6px rgba(201, 242, 77, .12); }
.page-about .season-rail__item:nth-child(4) .season-rail__index { background: var(--c-cyan); }
.page-about .season-rail__item:nth-child(5) .season-rail__index { background: var(--c-orange); color: var(--c-turf); box-shadow: 0 0 0 6px rgba(255, 122, 61, .12); }
.page-about .season-rail__item:nth-child(6) .season-rail__index { background: var(--c-lime); color: var(--c-turf); box-shadow: 0 0 0 6px rgba(201, 242, 77, .12); }

/* ---------- 校验流程 ---------- */
.page-about .about-verify {
  padding-top: clamp(38px, 6vw, 70px);
}

.page-about .about-verify .section-head__desc {
  max-width: 66ch;
}

.page-about .verify-flow {
  display: grid;
  gap: 12px;
  margin-top: clamp(24px, 3.4vw, 38px);
}

.page-about .verify-step {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(120deg, rgba(20, 51, 42, .8), rgba(17, 48, 40, .42));
  overflow: hidden;
}

.page-about .verify-step[open] {
  border-color: rgba(53, 240, 208, .4);
}

.page-about .verify-step__summary {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: clamp(14px, 2vw, 20px) clamp(16px, 2.2vw, 26px);
  cursor: pointer;
  list-style: none;
}

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

.page-about .verify-step__num {
  font-size: var(--fs-20);
  font-weight: 700;
  letter-spacing: .08em;
  color: var(--c-orange);
  flex-shrink: 0;
}

.page-about .verify-step__name {
  flex: 1;
  font-size: var(--fs-20);
  font-weight: 700;
  color: var(--c-chalk);
}

.page-about .verify-step__chevron {
  width: 10px;
  height: 10px;
  border-right: 2px solid var(--c-cyan);
  border-bottom: 2px solid var(--c-cyan);
  transform: rotate(45deg) translateY(-2px);
  transition: transform .28s ease;
  flex-shrink: 0;
}

.page-about .verify-step[open] .verify-step__chevron {
  transform: rotate(-135deg) translateY(-2px);
}

.page-about .verify-step__body {
  padding: 0 clamp(16px, 2.2vw, 26px) clamp(16px, 2vw, 22px);
}

.page-about .verify-step__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.page-about .verify-step__list li {
  position: relative;
  padding-left: 20px;
  font-size: var(--fs-15);
  line-height: 1.75;
  color: var(--c-chalk);
  max-width: 72ch;
}

.page-about .verify-step__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .7em;
  width: 10px;
  height: 2px;
  background: var(--c-cyan);
}

.page-about .about-verify__note {
  margin: clamp(18px, 2.6vw, 28px) 0 0;
  padding: 16px 20px;
  border-left: 3px solid var(--c-crimson);
  border-radius: 0 var(--radius) var(--radius) 0;
  background: rgba(255, 61, 90, .07);
  font-size: var(--fs-15);
  line-height: 1.72;
  color: var(--c-chalk);
  max-width: 74ch;
}

/* ---------- 中段过渡 ---------- */
.page-about .about-divider {
  margin: clamp(38px, 6vw, 72px) 0 0;
}

.page-about .about-divider .figure__frame {
  border-radius: 0;
  overflow: hidden;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

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

.page-about .about-divider .figure__caption {
  padding: 10px var(--gutter) 0;
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  padding-top: clamp(38px, 6vw, 70px);
}

.page-about .about-team__grid {
  display: grid;
  gap: clamp(24px, 3.4vw, 40px);
  grid-template-columns: 1fr;
}

.page-about .about-team__intro h2 {
  margin: 10px 0 16px;
}

.page-about .hive {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .hive__cell {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 16px 20px;
  background: linear-gradient(160deg, rgba(20, 51, 42, .95), rgba(15, 58, 42, .55));
  clip-path: polygon(20px 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%, 0 20px);
}

.page-about .hive__cell:nth-child(even) { transform: translateY(18px); }

.page-about .hive__cell--cyan { border-top: 2px solid var(--c-cyan); }
.page-about .hive__cell--orange { border-top: 2px solid var(--c-orange); }
.page-about .hive__cell--lime { border-top: 2px solid var(--c-lime); }
.page-about .hive__cell--mist { border-top: 2px solid var(--c-mist); }

.page-about .hive__count {
  font-size: var(--fs-34);
  line-height: 1;
  letter-spacing: .08em;
  font-weight: 700;
  color: var(--c-chalk);
}

.page-about .hive__cell--cyan .hive__count { color: var(--c-cyan); }
.page-about .hive__cell--orange .hive__count { color: var(--c-orange); }
.page-about .hive__cell--lime .hive__count { color: var(--c-lime); }

.page-about .hive__role {
  font-size: var(--fs-17);
  font-weight: 700;
  color: var(--c-chalk);
}

.page-about .hive__duty {
  font-size: var(--fs-13);
  line-height: 1.7;
  color: var(--c-mist);
}

.page-about .about-team__figure {
  margin: clamp(38px, 5vw, 60px) 0 0;
}

.page-about .about-team__figure .figure__frame {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--line);
}

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

/* ---------- 本地纹理 ---------- */
.page-about .bulwark--flip::before {
  background-image: repeating-linear-gradient(
    90deg,
    transparent 0 18px,
    var(--c-stone) 18px 34px
  );
}

.page-about .about-local {
  padding-top: clamp(24px, 3.4vw, 40px);
}

.page-about .about-local__grid {
  display: grid;
  gap: clamp(24px, 3.4vw, 42px);
  grid-template-columns: 1fr;
}

.page-about .about-local h2 {
  margin: 10px 0 16px;
}

.page-about .about-local__art {
  position: relative;
  align-self: end;
  padding: 12px 0 0;
}

.page-about .about-ridge {
  display: block;
  width: 100%;
  height: clamp(120px, 22vw, 190px);
}

.page-about .about-ridge__band--far { fill: var(--c-stone); opacity: .08; }
.page-about .about-ridge__band--mid { fill: var(--c-cyan); opacity: .10; }
.page-about .about-ridge__band--near { fill: var(--c-orange); opacity: .12; }

.page-about .about-local__caption {
  margin: 8px 0 0;
  font-size: var(--fs-13);
  letter-spacing: .04em;
  color: var(--c-mist);
}

/* ---------- 口径评审 ---------- */
.page-about .about-collab {
  padding-top: clamp(38px, 6vw, 72px);
}

.page-about .about-collab .section-head__desc {
  max-width: 68ch;
}

.page-about .about-collab__grid {
  margin-top: clamp(22px, 3vw, 34px);
}

.page-about .about-collab__card {
  padding: clamp(18px, 2.2vw, 26px);
  border-radius: var(--radius);
  border: 1px solid var(--line-soft);
  background: linear-gradient(200deg, rgba(20, 51, 42, .9), rgba(8, 34, 26, .4));
}

.page-about .about-collab__no {
  display: block;
  font-size: var(--fs-13);
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--c-orange);
  margin-bottom: 12px;
}

.page-about .about-collab__title {
  margin: 0 0 12px;
  font-size: var(--fs-20);
  font-weight: 700;
  color: var(--c-chalk);
  line-height: 1.5;
}

.page-about .about-collab__card p {
  margin: 0;
  font-size: var(--fs-15);
  line-height: 1.75;
  color: var(--c-mist);
}

.page-about .about-collab__note {
  margin: clamp(20px, 3vw, 32px) 0 0;
  font-size: var(--fs-15);
  line-height: 1.78;
  color: var(--c-mist);
  max-width: 74ch;
}

/* ---------- 继续阅读 ---------- */
.page-about .about-next {
  padding-top: clamp(38px, 6vw, 72px);
}

.page-about .about-next__panel {
  display: grid;
  gap: clamp(20px, 3vw, 34px);
  grid-template-columns: 1fr;
  padding: clamp(22px, 3vw, 38px);
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
  background:
    radial-gradient(90% 120% at 100% 0%, rgba(53, 240, 208, .12), transparent 58%),
    linear-gradient(150deg, rgba(20, 51, 42, .95), rgba(8, 34, 26, .8));
}

.page-about .about-next__text h2 {
  margin: 10px 0 14px;
  color: var(--c-chalk);
}

.page-about .about-next__text p {
  margin: 0;
  font-size: var(--fs-15);
  line-height: 1.78;
  color: var(--c-mist);
  max-width: 62ch;
}

.page-about .about-next__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-content: start;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about { --about-rail: 96px; }

  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .season-rail__item { gap: 18px; }

  .page-about .season-rail::before { left: 21px; }
}

@media (min-width: 860px) {
  .page-about { --about-rail: 132px; }

  .page-about .about-why__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    align-items: start;
  }

  .page-about .about-local__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    align-items: end;
  }

  .page-about .about-next__panel {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    align-items: center;
  }

  .page-about .season-rail__stage { display: block; }

  .page-about .season-rail__item:nth-child(even) .season-rail__card {
    transform: translateX(clamp(0px, 2.6vw, 38px));
  }

  .page-about .season-rail__item:nth-child(even):hover .season-rail__card,
  .page-about .season-rail__item:nth-child(even):focus-within .season-rail__card {
    transform: translateX(clamp(0px, 2.6vw, 38px)) translateY(-3px);
  }

  .page-about .season-rail__item:hover .season-rail__card,
  .page-about .season-rail__item:focus-within .season-rail__card {
    transform: translateY(-3px);
  }
}

@media (min-width: 1024px) {
  .page-about .hive {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 14px;
  }

  .page-about .hive__cell:nth-child(even) { transform: translateY(22px); }

  .page-about .about-team__figure {
    margin-top: clamp(46px, 5vw, 68px);
  }
}

@media (max-width: 400px) {
  .page-about { --about-rail: 52px; }

  .page-about .season-rail__index {
    width: 38px;
    height: 38px;
    font-size: var(--fs-13);
  }

  .page-about .season-rail::before { left: 18px; }

  .page-about .hive { grid-template-columns: 1fr; }
  .page-about .hive__cell:nth-child(even) { transform: none; }
}

/* ---------- 渐显（渐进增强） ---------- */
.page-about .reveal { opacity: 1; transform: none; }

.page-about.js-motion .page-about .reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity .62s ease, transform .62s cubic-bezier(.2, .7, .3, 1);
}

.page-about.js-motion .page-about .reveal.is-visible {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .page-about .reveal,
  .page-about.js-motion .page-about .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
}