.page-about {
  --about-gap: clamp(52px, 8vw, 104px);
  --about-rail-w: 196px;
  padding-bottom: clamp(40px, 6vw, 72px);
  color: var(--body-text);
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumbs {
  padding-top: clamp(14px, 3vw, 26px);
}

.page-about .breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .55em;
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--mist);
}

.page-about .breadcrumbs a {
  color: var(--mist);
  text-decoration: none;
  transition: color .25s ease;
}

.page-about .breadcrumbs a:hover,
.page-about .breadcrumbs a:focus-visible {
  color: var(--neon);
}

.page-about .breadcrumbs [aria-current="page"] {
  color: var(--cloud);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  margin-top: clamp(18px, 3vw, 32px);
  padding: clamp(44px, 8vw, 92px) 0 clamp(38px, 5vw, 66px);
  background:
    radial-gradient(92% 74% at 84% -4%, rgba(63, 224, 198, .13), transparent 62%),
    linear-gradient(174deg, var(--deep-green) 0%, var(--felt-black) 74%);
}

.page-about .about-hero__plane {
  position: absolute;
  inset: 0 0 0 auto;
  width: min(760px, 76vw);
  background:
    linear-gradient(205deg, rgba(226, 82, 158, .16), transparent 52%),
    linear-gradient(340deg, rgba(63, 224, 198, .12), transparent 58%);
  clip-path: polygon(44% 0, 100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}

.page-about .about-hero__chip {
  position: absolute;
  right: clamp(-56px, -3vw, -14px);
  bottom: clamp(-52px, -3vw, -14px);
  width: clamp(180px, 26vw, 330px);
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  border: 1px solid rgba(232, 183, 92, .26);
  background: repeating-conic-gradient(from 0deg,
      rgba(232, 183, 92, .13) 0deg 6deg,
      transparent 6deg 20deg);
  opacity: .55;
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__eyebrow {
  margin: 0;
  font-size: 12px;
  letter-spacing: .28em;
  color: var(--neon);
}

.page-about .about-hero h1 {
  margin: 16px 0 0;
  max-width: 15em;
  font-size: clamp(30px, 5.6vw, 56px);
  line-height: 1.12;
  letter-spacing: -.02em;
  color: var(--cloud);
}

.page-about .about-hero__lead {
  margin: clamp(18px, 2.6vw, 26px) 0 0;
  max-width: 38em;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: var(--body-text);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(24px, 3.4vw, 36px);
}

.page-about .hero-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(16px, 3vw, 28px);
  margin-top: clamp(30px, 4.2vw, 46px);
  padding-top: clamp(18px, 2.4vw, 26px);
  border-top: 1px solid var(--line-slate);
}

.page-about .hero-stat {
  display: grid;
  gap: 6px;
}

.page-about .hero-stat__value {
  font-size: clamp(22px, 3.2vw, 32px);
  line-height: 1;
  color: var(--gold);
  letter-spacing: -.01em;
}

.page-about .hero-stat__label {
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--mist);
}

/* ---------- 主体布局 ---------- */
.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 5vw, 54px);
  padding-top: clamp(40px, 6vw, 72px);
}

.page-about .about-rail {
  display: none;
}

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

/* ---------- 章节 ---------- */
.page-about .chapter {
  position: relative;
  padding-bottom: var(--about-gap);
  scroll-margin-top: calc(var(--header-space) + 26px);
}

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

.page-about .chapter + .chapter::before {
  content: "";
  display: block;
  height: 1px;
  margin-bottom: calc(var(--about-gap) * .52);
  background: linear-gradient(90deg, var(--line-slate), transparent 74%);
}

.page-about .chapter-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 10px 16px;
  align-items: start;
  margin-bottom: clamp(20px, 3.2vw, 36px);
}

.page-about .chapter-head__index {
  padding-top: .5em;
  font-size: 13px;
  letter-spacing: .2em;
  color: var(--gold);
}

.page-about .chapter-head__body h2 {
  margin: 0;
  font-size: clamp(24px, 3.6vw, 38px);
  line-height: 1.16;
  letter-spacing: -.01em;
  color: var(--cloud);
}

.page-about .chapter-head__sub {
  margin: .55em 0 0;
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--mist);
}

.page-about .chapter-head__note {
  display: none;
  writing-mode: vertical-rl;
  padding-top: .35em;
  font-size: 11px;
  letter-spacing: .3em;
  color: var(--mist);
}

/* ---------- 正文块 ---------- */
.page-about .chapter-body {
  max-width: 40em;
  font-size: 16px;
  line-height: 1.85;
}

.page-about .chapter-body p {
  margin: 0 0 1.15em;
}

.page-about .chapter-body p:last-child {
  margin-bottom: 0;
}

.page-about .chapter-body a,
.page-about .chapter-link a {
  color: var(--neon);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

.page-about .chapter-body a:hover,
.page-about .chapter-link a:hover {
  text-decoration-thickness: 2px;
}

.page-about .chapter-link {
  max-width: 40em;
  margin: clamp(20px, 3vw, 30px) 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--mist);
}

/* ---------- 图片槽 ---------- */
.page-about .media-frame {
  position: relative;
  margin: clamp(24px, 4vw, 40px) 0 0;
  overflow: hidden;
  border: 1px solid var(--line-slate);
  border-radius: var(--radius-lg);
  background: linear-gradient(160deg, var(--deep-green), var(--felt-black));
}

.page-about .media-frame__img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  filter: saturate(.92);
}

.page-about .media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(120% 90% at 50% 0%, transparent 45%, rgba(10, 15, 13, .55));
  pointer-events: none;
}

.page-about .media-caption {
  position: relative;
  z-index: 1;
  margin: 0;
  padding: 12px clamp(16px, 2.4vw, 22px) 14px;
  font-size: 12.5px;
  line-height: 1.7;
  letter-spacing: .04em;
  color: var(--mist);
  border-top: 1px solid var(--line-slate);
}

/* ---------- 玩法色带 ---------- */
.page-about .strata {
  display: grid;
  gap: 2px;
  margin-top: clamp(22px, 3.4vw, 36px);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.page-about .strata__band {
  position: relative;
  padding: clamp(20px, 3vw, 30px) clamp(18px, 3vw, 34px);
  border-left: 2px solid var(--line-slate);
  transition: border-color .3s ease, transform .3s ease;
}

.page-about .strata__band--a {
  background: linear-gradient(100deg, rgba(63, 224, 198, .09), transparent 76%);
}

.page-about .strata__band--b {
  background: linear-gradient(100deg, rgba(63, 224, 198, .05), transparent 76%);
}

.page-about .strata__band--c {
  background: linear-gradient(100deg, rgba(232, 183, 92, .07), transparent 76%);
}

.page-about .strata__band:hover,
.page-about .strata__band:focus-within {
  border-left-color: var(--neon);
  transform: translateX(4px);
}

.page-about .strata__band--c:hover {
  border-left-color: var(--gold);
}

.page-about .strata__idx {
  display: block;
  font-size: 11px;
  letter-spacing: .24em;
  color: var(--mist);
}

.page-about .strata__title {
  margin: 10px 0 8px;
  font-size: clamp(19px, 2.4vw, 23px);
  line-height: 1.3;
  color: var(--cloud);
}

.page-about .strata__text {
  margin: 0;
  max-width: 36em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--body-text);
}

.page-about .strata__meta {
  margin: 10px 0 0;
  font-size: 12.5px;
  letter-spacing: .06em;
  color: var(--mist);
}

/* ---------- 时间线 ---------- */
.page-about .timeline {
  position: relative;
  margin: 0;
  padding: 4px 0 4px 30px;
  list-style: none;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--neon-dim), var(--line-slate) 42%, transparent);
}

.page-about .timeline__item {
  position: relative;
  padding-bottom: clamp(24px, 3.4vw, 34px);
}

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

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 7px;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  border: 1px solid var(--gold);
  background: var(--felt-black);
  box-shadow: 0 0 0 3px rgba(232, 183, 92, .08);
  transition: transform .3s ease, box-shadow .3s ease;
}

.page-about .timeline__item:hover::before {
  transform: scale(1.18);
  box-shadow: 0 0 0 7px rgba(232, 183, 92, .14);
}

.page-about .timeline__stage {
  display: block;
  font-size: 11px;
  letter-spacing: .22em;
  color: var(--neon);
}

.page-about .timeline__title {
  margin: 8px 0 6px;
  font-size: clamp(17px, 2.1vw, 20px);
  line-height: 1.35;
  color: var(--cloud);
}

.page-about .timeline__body p {
  margin: 0;
  max-width: 34em;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--body-text);
}

/* ---------- 赛制标签 ---------- */
.page-about .format-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: clamp(20px, 3vw, 28px);
}

.page-about .format-tags .tag {
  padding: 7px 15px;
  font-size: 12.5px;
  letter-spacing: .1em;
}

/* ---------- 段位阶梯 ---------- */
.page-about .ranks {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: clamp(22px, 3.4vw, 32px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ranks__item {
  flex: 1 1 52px;
  min-width: 52px;
  display: grid;
  place-items: center;
  gap: 4px;
  padding: 12px 6px;
  border: 1px solid var(--line-slate);
  border-radius: var(--radius-md);
  background: linear-gradient(170deg, var(--table-green), var(--felt-black));
  transition: border-color .3s ease, transform .3s ease;
}

.page-about .ranks__item:hover {
  border-color: var(--neon-dim);
  transform: translateY(-3px);
}

.page-about .ranks__num {
  font-size: 16px;
  line-height: 1;
  color: var(--mist);
}

.page-about .ranks__name {
  font-size: 10.5px;
  letter-spacing: .12em;
  color: var(--mist);
}

.page-about .ranks__item--top {
  border-color: rgba(232, 183, 92, .55);
  box-shadow: 0 0 0 1px rgba(232, 183, 92, .14), 0 8px 26px rgba(232, 183, 92, .12);
}

.page-about .ranks__item--top .ranks__num,
.page-about .ranks__item--top .ranks__name {
  color: var(--gold);
}

/* ---------- 更新节奏 ---------- */
.page-about .cadence {
  display: grid;
  gap: 0;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line-slate);
}

.page-about .cadence__item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: clamp(16px, 2.4vw, 22px) 0;
  border-bottom: 1px solid var(--line-slate);
}

.page-about .cadence__value {
  font-size: 15px;
  letter-spacing: .06em;
  color: var(--neon);
}

.page-about .cadence__label {
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--mist);
}

.page-about .cadence__item p {
  margin: 4px 0 0;
  max-width: 40em;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--body-text);
}

/* ---------- 结尾行动区 ---------- */
.page-about .about-cta {
  margin-top: clamp(48px, 7vw, 92px);
  border-top: 1px solid var(--line-slate);
  background:
    radial-gradient(80% 130% at 12% 0%, rgba(63, 224, 198, .12), transparent 60%),
    linear-gradient(180deg, var(--deep-green), var(--felt-black));
}

.page-about .about-cta__inner {
  display: grid;
  gap: clamp(20px, 3vw, 32px);
  padding: clamp(38px, 6vw, 66px) 0;
}

.page-about .about-cta h2 {
  margin: 0;
  font-size: clamp(23px, 3.4vw, 34px);
  line-height: 1.2;
  letter-spacing: -.01em;
  color: var(--cloud);
}

.page-about .about-cta p {
  margin: 14px 0 0;
  max-width: 34em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--body-text);
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .chapter-head__note {
    display: block;
  }

  .page-about .hero-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: clamp(16px, 2.4vw, 24px);
  }

  .page-about .cadence__item {
    grid-template-columns: 110px 150px minmax(0, 1fr);
    align-items: baseline;
    gap: 8px 18px;
  }

  .page-about .cadence__item p {
    margin: 0;
  }

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

  .page-about .about-cta__actions {
    justify-content: flex-end;
  }
}

@media (min-width: 1040px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: clamp(36px, 5vw, 72px);
    align-items: start;
  }

  .page-about .about-rail {
    display: block;
    position: sticky;
    top: calc(var(--header-space) + 24px);
    align-self: start;
    max-height: calc(100vh - var(--header-space) - 48px);
    overflow-y: auto;
  }

  .page-about .about-rail__label {
    margin: 0 0 16px;
    font-size: 11px;
    letter-spacing: .28em;
    color: var(--mist);
  }

  .page-about .about-rail__list {
    margin: 0;
    padding: 0;
    list-style: none;
    border-left: 1px solid var(--line-slate);
  }

  .page-about .rail__link {
    display: grid;
    grid-template-columns: 2.4em minmax(0, 1fr);
    align-items: baseline;
    gap: 10px;
    padding: 9px 0 9px 14px;
    margin-left: -1px;
    border-left: 1px solid transparent;
    font-size: 13px;
    line-height: 1.5;
    color: var(--mist);
    text-decoration: none;
    transition: color .25s ease, border-color .25s ease;
  }

  .page-about .rail__num {
    font-size: 11px;
    letter-spacing: .14em;
    color: var(--line-slate);
    transition: color .25s ease;
  }

  .page-about .rail__link:hover,
  .page-about .rail__link:focus-visible {
    color: var(--cloud);
    border-left-color: var(--neon-dim);
  }

  .page-about .rail__link:hover .rail__num,
  .page-about .rail__link:focus-visible .rail__num {
    color: var(--neon);
  }

  .page-about .chapter.is-active .chapter-head__index {
    color: var(--neon);
    text-shadow: 0 0 16px var(--glow);
  }

  .page-about .chapter.is-active .chapter-head__body h2 {
    text-shadow: 0 0 26px rgba(63, 224, 198, .18);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .strata__band,
  .page-about .ranks__item,
  .page-about .timeline__item::before {
    transition: none;
  }

  .page-about .strata__band:hover,
  .page-about .ranks__item:hover {
    transform: none;
  }
}
<<<END>>>