.page-about {
  --about-idx-w: clamp(54px, 10vw, 150px);
  --about-gold-line: rgba(232, 178, 58, .34);
  --about-hair: rgba(199, 209, 220, .18);
  --about-hair-dark: rgba(22, 17, 12, .14);
}

/* ---------- 通用章节骨架 ---------- */
.page-about .about-chapter__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(16px, 3vw, 26px);
}

.page-about .about-chapter__index {
  display: flex;
  align-items: center;
  gap: 14px;
  color: var(--gold);
  align-self: start;
}

.page-about .about-chapter__num {
  font-size: clamp(38px, 7vw, 82px);
  font-weight: 800;
  line-height: .82;
  letter-spacing: -.05em;
  color: inherit;
}

.page-about .about-chapter__tick {
  display: block;
  width: 52px;
  height: 2px;
  flex: 0 0 auto;
  background: currentColor;
  opacity: .5;
  align-self: center;
}

.page-about .section--cream .about-chapter__num {
  color: var(--ink);
}

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

.page-about .about-chapter__body > .lede {
  max-width: 60ch;
}

.page-about .about-chapter__link {
  margin: clamp(22px, 3.4vw, 34px) 0 0;
}

.page-about .about-wave {
  margin: clamp(22px, 3.4vw, 36px) 0;
  color: var(--cyan);
  opacity: .55;
}

.page-about .about-wave svg {
  display: block;
  width: 100%;
  height: clamp(24px, 3vw, 34px);
}

@media (min-width: 880px) {
  .page-about .about-chapter__grid {
    grid-template-columns: var(--about-idx-w) minmax(0, 1fr);
    gap: clamp(28px, 4vw, 62px);
  }

  .page-about .about-chapter__index {
    flex-direction: column;
    align-items: flex-start;
    gap: 22px;
    position: sticky;
    top: calc(var(--header-h, 66px) + 30px);
  }

  .page-about .about-chapter__tick {
    width: 2px;
    height: clamp(64px, 11vw, 138px);
    align-self: stretch;
    background: repeating-linear-gradient(to bottom, currentColor 0 5px, transparent 5px 13px);
  }
}

/* ---------- 01 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-top: clamp(84px, 12vw, 142px);
  padding-bottom: clamp(62px, 9vw, 118px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: auto -12% -42% -12%;
  height: 74%;
  pointer-events: none;
  background:
    radial-gradient(60% 70% at 28% 100%, rgba(47, 224, 200, .15), transparent 70%),
    radial-gradient(52% 62% at 84% 92%, rgba(232, 178, 58, .13), transparent 72%);
}

.page-about .about-hero > .wrap {
  position: relative;
  z-index: 1;
}

.page-about .about-hero .breadcrumb {
  margin: 0 0 clamp(24px, 5vw, 48px);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(30px, 6vw, 64px);
  align-items: center;
}

.page-about .about-hero__title {
  margin: 0;
  font-size: clamp(42px, 9.2vw, 92px);
  line-height: .96;
  font-weight: 900;
  letter-spacing: -.045em;
}

.page-about .about-hero__mark {
  position: relative;
  z-index: 0;
  color: var(--gold);
  display: inline-block;
}

.page-about .about-hero__mark::after {
  content: "";
  position: absolute;
  left: -.02em;
  right: -.02em;
  bottom: .04em;
  height: clamp(4px, .8vw, 9px);
  z-index: -1;
  transform: skewX(-12deg);
  background: linear-gradient(90deg, var(--gold), var(--amber));
  opacity: .85;
}

.page-about .about-hero__lede {
  margin-top: clamp(20px, 3.4vw, 30px);
  max-width: 56ch;
}

.page-about .about-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: clamp(18px, 4vw, 44px);
  margin-top: clamp(26px, 4vw, 42px);
  padding-top: clamp(18px, 3vw, 26px);
  border-top: 1px solid var(--about-hair);
}

.page-about .about-hero__fact {
  display: flex;
  align-items: baseline;
  gap: 8px;
  color: var(--mist);
  font-size: 14px;
}

.page-about .about-hero__fact-n {
  font-size: clamp(26px, 3.6vw, 38px);
  font-weight: 800;
  color: var(--gold);
  line-height: 1;
  letter-spacing: -.03em;
}

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

@media (min-width: 980px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, .98fr);
  }
}

/* ---------- 02 三级内容体系 ---------- */
.page-about .about-layers {
  list-style: none;
  margin: clamp(30px, 5vw, 50px) 0 0;
  padding: 0;
  display: grid;
  gap: clamp(14px, 2.2vw, 22px);
}

.page-about .about-layer {
  padding: clamp(22px, 3.2vw, 34px);
  border-radius: var(--r-md);
  background: var(--goldmist);
  border-left: 4px solid var(--gold);
  display: grid;
  gap: 8px;
}

.page-about .about-layer__tag {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .14em;
  color: var(--scarlet);
}

.page-about .about-layer__title {
  margin: 0;
  font-size: clamp(19px, 2.3vw, 24px);
  font-weight: 800;
  color: var(--ink);
}

.page-about .about-layer p {
  margin: 0;
  color: var(--ink);
}

/* ---------- 03 联赛与赛制 ---------- */
.page-about .about-formats {
  list-style: none;
  margin: clamp(30px, 5vw, 48px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--about-hair);
  border: 1px solid var(--about-hair);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .about-format {
  padding: clamp(20px, 3vw, 30px);
  background: rgba(10, 26, 47, .48);
  display: grid;
  gap: 8px;
  align-content: start;
}

.page-about .about-format__name {
  margin: 0;
  font-size: clamp(19px, 2.2vw, 23px);
  font-weight: 800;
  color: var(--gold);
}

.page-about .about-format__rhythm {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .02em;
  color: var(--cyan);
}

.page-about .about-format p {
  margin: 0;
  color: var(--mist);
}

@media (min-width: 620px) {
  .page-about .about-formats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* ---------- 04 版本演进 ---------- */
.page-about .about-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

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

.page-about .about-step details {
  border-radius: var(--r-sm);
  border: 1px solid var(--about-gold-line);
  background: rgba(18, 58, 107, .3);
  transition: background .3s var(--ease), border-color .3s var(--ease);
}

.page-about .about-step details[open] {
  background: rgba(18, 58, 107, .54);
  border-color: var(--gold);
}

.page-about .about-step summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 16px;
  padding: clamp(16px, 2.4vw, 24px) clamp(16px, 2.8vw, 30px);
}

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

.page-about .about-step summary::after {
  content: "+";
  margin-left: auto;
  font-size: 20px;
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-step details[open] > summary::after {
  content: "−";
}

.page-about .about-step__v {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .1em;
  color: var(--gold);
}

.page-about .about-step__name {
  font-size: clamp(18px, 2.2vw, 22px);
  font-weight: 800;
  color: var(--cream);
}

.page-about .about-step__note {
  flex-basis: 100%;
  font-size: 14px;
  color: var(--mist);
}

.page-about .about-step__panel {
  padding: 0 clamp(16px, 2.8vw, 30px) clamp(18px, 2.6vw, 26px);
  color: var(--mist);
}

.page-about .about-step__panel p {
  margin: 0;
  max-width: 58ch;
}

.page-about .about-evolution__figure {
  margin: clamp(30px, 5vw, 52px) 0 0;
  border-radius: var(--r-md);
  overflow: hidden;
  border: 1px solid var(--about-gold-line);
}

@media (min-width: 760px) {
  .page-about .about-step:nth-child(2) { margin-left: 4%; }
  .page-about .about-step:nth-child(3) { margin-left: 8%; }
  .page-about .about-step:nth-child(4) { margin-left: 12%; }
}

/* ---------- 05 团队与流程 ---------- */
.page-about .about-team {
  list-style: none;
  margin: clamp(30px, 5vw, 50px) 0 0;
  padding: 0;
  border-top: 1px solid var(--about-hair-dark);
}

.page-about .about-team__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 4px 18px;
  padding: clamp(18px, 2.6vw, 26px) 0;
  border-bottom: 1px solid var(--about-hair-dark);
}

.page-about .about-team__no {
  grid-column: 1;
  padding-top: 5px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .12em;
  color: var(--scarlet);
}

.page-about .about-team__name {
  grid-column: 2;
  margin: 0;
  font-size: clamp(18px, 2.2vw, 22px);
  font-weight: 800;
  color: var(--ink);
}

.page-about .about-team__item p {
  grid-column: 2;
  margin: 0;
  color: var(--ink);
  max-width: 58ch;
}

.page-about .about-flow {
  list-style: none;
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
}

.page-about .about-flow__node {
  padding: 16px 18px;
  background: rgba(232, 178, 58, .12);
  border-left: 3px solid var(--gold);
  border-radius: 0 var(--r-xs) var(--r-xs) 0;
  font-size: 14px;
  color: var(--ink);
}

.page-about .about-flow__node .num {
  display: block;
  margin-bottom: 6px;
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--scarlet);
}

.page-about .about-team__figure {
  margin: clamp(30px, 5vw, 48px) 0 0;
  border-radius: var(--r-md);
  overflow: hidden;
}

@media (min-width: 760px) {
  .page-about .about-flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 1px;
  }
}

/* ---------- 06 更新节奏 ---------- */
.page-about .about-stats {
  list-style: none;
  margin: clamp(30px, 5vw, 52px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--about-hair);
  border: 1px solid var(--about-hair);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .about-stat {
  padding: clamp(22px, 3.4vw, 36px);
  background: var(--midnight);
  display: grid;
  gap: 10px;
  align-content: start;
}

.page-about .about-stat__value {
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: 6px;
}

.page-about .about-stat__n {
  font-size: clamp(32px, 5vw, 52px);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--gold);
}

.page-about .about-stat__u {
  font-size: 14px;
  color: var(--cyan);
}

.page-about .about-stat__label {
  margin: 0;
  font-size: 14px;
  color: var(--mist);
}

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

/* ---------- 07 长期约定 ---------- */
.page-about .about-close__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: clamp(22px, 3.6vw, 36px);
}

.page-about .about-close__note {
  margin-top: 18px;
  font-size: 14px;
  color: var(--mist);
}
<<<END>>>