.page-about {
  --about-rail: 168px;
  --about-sticky: 104px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(36px, 5.5vw, 76px) 0 clamp(34px, 5vw, 68px);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -34%;
  right: -14%;
  width: min(58vw, 680px);
  aspect-ratio: 1 / 1;
  background: linear-gradient(140deg, rgba(34, 245, 208, 0.2), rgba(122, 92, 255, 0.13) 54%, transparent 76%);
  transform: rotate(8deg);
  pointer-events: none;
}

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

.page-about .about-hero__grid {
  row-gap: clamp(28px, 4vw, 48px);
  align-items: start;
}

.page-about .about-hero__title {
  margin: 16px 0 20px;
  max-width: 15em;
}

.page-about .about-hero .lede {
  max-width: 34em;
}

.page-about .about-hero__note {
  margin: 20px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--cyan);
  max-width: 34em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--paper-56);
}

.page-about .about-hero__stats {
  padding: clamp(20px, 2.4vw, 30px);
}

.page-about .about-stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(18px, 2.4vw, 26px) 18px;
}

.page-about .about-stats__item {
  border-top: 1px solid var(--line);
  padding-top: 12px;
}

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

.page-about .about-stats__num {
  font-family: var(--font-mono);
  font-size: clamp(28px, 3.2vw, 38px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan);
}

.page-about .about-stats__unit {
  font-size: 13px;
  color: var(--paper-56);
}

.page-about .about-stats__label {
  margin: 8px 0 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist);
}

/* ---------- 主体双栏 ---------- */
.page-about .about-body {
  padding-top: clamp(44px, 5.5vw, 84px);
}

.page-about .about-body__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(32px, 4vw, 56px);
  align-items: start;
}

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

@media (min-width: 980px) {
  .page-about .about-body__grid {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(40px, 4.5vw, 76px);
  }

  .page-about .about-rail {
    display: block;
    position: sticky;
    top: var(--about-sticky);
  }
}

.page-about .rail__num {
  display: inline-block;
  transition: transform var(--t-base) var(--ease), color var(--t-base) var(--ease);
}

.page-about .rail__link:hover .rail__num {
  transform: scale(1.35);
  color: var(--cyan);
}

/* ---------- 赛季演进时间线 ---------- */
.page-about .about-track {
  scroll-margin-top: 120px;
}

.page-about .about-track .section-head {
  margin-bottom: clamp(28px, 3.6vw, 44px);
}

.page-about .track {
  list-style: none;
  margin: 0;
  padding: 0 0 0 clamp(18px, 2.4vw, 32px);
  border-left: 1px solid var(--line);
}

.page-about .track__item {
  position: relative;
  max-width: 100%;
  padding-bottom: clamp(32px, 4.4vw, 56px);
}

.page-about .track__item::before {
  content: "";
  position: absolute;
  top: 9px;
  left: calc(-1 * clamp(18px, 2.4vw, 32px) - 3px);
  width: 5px;
  height: 5px;
  background: var(--cyan);
}

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

@media (min-width: 760px) {
  .page-about .track__item:nth-child(even) {
    max-width: 86%;
  }
}

.page-about .track__season {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: clamp(22px, 2.6vw, 30px);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--paper);
}

.page-about .track__season span {
  margin-left: 10px;
  font-family: var(--font-body);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--cyan);
}

.page-about .track__item h3 {
  margin: 0 0 10px;
  font-size: clamp(18px, 2vw, 21px);
  line-height: 1.5;
  color: var(--paper);
}

.page-about .track__item p {
  margin: 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--paper-72);
}

.page-about .track__figure {
  max-width: 480px;
  margin: 0 0 clamp(32px, 4.4vw, 56px);
  padding-left: 0;
}

.page-about .about-figure {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--ink-800);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .about-figure figcaption {
  padding: 12px 16px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 团队分工 ---------- */
.page-about .about-crew {
  scroll-margin-top: 120px;
}

.page-about .crew {
  display: grid;
  gap: 1px;
  margin-top: clamp(26px, 3.4vw, 40px);
  background: var(--line);
  border: 1px solid var(--line);
}

@media (min-width: 780px) {
  .page-about .crew {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .crew__card {
  --crew-accent: var(--cyan);
  background: var(--ink-800);
  border-top: 2px solid var(--crew-accent);
  padding: clamp(22px, 2.8vw, 34px) clamp(18px, 2.2vw, 28px) clamp(26px, 3vw, 38px);
}

.page-about .crew__card:nth-child(2) {
  --crew-accent: var(--violet);
}

.page-about .crew__card:nth-child(3) {
  --crew-accent: var(--orange);
}

.page-about .crew__figure {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: clamp(38px, 4.6vw, 54px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--crew-accent);
}

.page-about .crew__figure span {
  margin-left: 6px;
  font-family: var(--font-body);
  font-size: 14px;
  letter-spacing: 0;
  color: var(--mist);
}

.page-about .crew__rule {
  width: 30px;
  height: 2px;
  margin: 0 0 16px;
  background: var(--crew-accent);
}

.page-about .crew__card h3 {
  margin: 0 0 12px;
  font-size: clamp(19px, 2vw, 22px);
  color: var(--paper);
}

.page-about .crew__card p {
  margin: 0 0 12px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--paper-72);
}

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

/* ---------- 数据工序 ---------- */
.page-about .about-flow {
  scroll-margin-top: 120px;
}

.page-about .about-flow__wrap {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3vw, 40px);
  align-items: start;
}

@media (min-width: 900px) {
  .page-about .about-flow__wrap {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
  }

  .page-about .about-flow__figure {
    position: sticky;
    top: var(--about-sticky);
  }
}

.page-about .flow {
  border-top: 1px solid var(--line-strong);
}

.page-about .flow__step {
  border-bottom: 1px solid var(--line);
}

.page-about .flow__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto auto;
  align-items: center;
  gap: clamp(12px, 2vw, 22px);
  width: 100%;
  padding: clamp(16px, 2vw, 22px) 0;
  margin: 0;
  background: none;
  border: 0;
  font: inherit;
  color: inherit;
  text-align: left;
  cursor: pointer;
  transition: color var(--t-base) var(--ease);
}

.page-about .flow__head:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

.page-about .flow__head::after {
  content: "";
  width: 8px;
  height: 8px;
  margin-left: 4px;
  border-right: 1px solid var(--mist);
  border-bottom: 1px solid var(--mist);
  transform: rotate(45deg);
  transition: transform var(--t-base) var(--ease), border-color var(--t-base) var(--ease);
}

.page-about .flow__head[aria-expanded="true"]::after {
  transform: rotate(-135deg);
  border-color: var(--cyan);
}

.page-about .flow__head:hover .flow__name {
  color: var(--cyan);
}

.page-about .flow__idx {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.page-about .flow__name {
  font-size: clamp(18px, 2vw, 22px);
  font-weight: 700;
  color: var(--paper);
  transition: color var(--t-base) var(--ease);
}

.page-about .flow__meta {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--mist);
}

.page-about .flow__body {
  padding: 0 clamp(0px, 2vw, 40px) clamp(18px, 2.2vw, 24px) 26px;
}

.page-about .flow__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--paper-72);
}

.page-about .about-flow__figure {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--ink-800);
}

.page-about .about-flow__figure img {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .about-flow__figure figcaption {
  padding: 12px 16px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 服务标准 ---------- */
.page-about .about-sla {
  scroll-margin-top: 120px;
}

.page-about .sla {
  list-style: none;
  margin: clamp(26px, 3.4vw, 40px) 0 0;
  padding: 0;
  border-top: 1px solid var(--line-strong);
}

.page-about .sla__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: clamp(16px, 2vw, 22px) 0;
  border-bottom: 1px solid var(--line);
}

@media (min-width: 760px) {
  .page-about .sla__row {
    grid-template-columns: minmax(140px, 190px) minmax(0, 1fr);
    gap: clamp(18px, 3vw, 48px);
    align-items: baseline;
  }
}

.page-about .sla__key {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.page-about .sla__val {
  font-size: 16px;
  line-height: 1.8;
  color: var(--paper-72);
}

.page-about .sla__val b {
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-sla__link {
  margin: clamp(20px, 2.6vw, 30px) 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--paper-56);
}

.page-about .about-sla__link a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(34, 245, 208, 0.4);
  transition: border-color var(--t-base) var(--ease);
}

.page-about .about-sla__link a:hover {
  border-color: var(--cyan);
}

/* ---------- 运营地域 ---------- */
.page-about .about-place {
  scroll-margin-top: 120px;
}

.page-about .about-place__figure {
  margin: 0 0 clamp(24px, 3vw, 40px);
  border: 1px solid var(--line);
  overflow: hidden;
}

.page-about .about-place__figure img {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .about-place__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3vw, 48px);
  align-items: start;
}

@media (min-width: 880px) {
  .page-about .about-place__inner {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
  }
}

.page-about .about-place__text {
  margin: 16px 0 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--paper-72);
}

.page-about .about-place__side {
  border-left: 2px solid var(--cyan);
  padding-left: clamp(16px, 2vw, 24px);
}

.page-about .about-place__facts {
  margin: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-place__facts div {
  display: grid;
  grid-template-columns: minmax(84px, auto) minmax(0, 1fr);
  gap: 14px;
  align-items: baseline;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-place__facts dt {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--mist);
}

.page-about .about-place__facts dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.6;
  color: var(--paper);
}

.page-about .about-place__cta {
  margin: 22px 0 0;
}

/* ---------- 收尾 ---------- */
.page-about .about-outro {
  border-top: 1px solid var(--line);
}

.page-about .about-outro__claim {
  margin: 0 0 16px;
  font-size: clamp(24px, 3.2vw, 36px);
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-outro__sub {
  margin: 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--paper-72);
}

.page-about .about-outro__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 26px 0 0;
}

.page-about .about-outro__band {
  list-style: none;
  margin: clamp(36px, 4.5vw, 64px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

@media (min-width: 780px) {
  .page-about .about-outro__band {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .about-outro__band li {
  background: var(--ink-900);
  padding: clamp(20px, 2.4vw, 30px) clamp(16px, 2vw, 26px);
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .about-outro__band span {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: clamp(24px, 2.8vw, 34px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--paper);
}
<<<END>>>