.page-about {
  --about-rail: 172px;
  background: var(--void);
  color: var(--mist);
  font-family: var(--sans);
  overflow-wrap: break-word;
}

.page-about .about-crumb {
  padding-top: clamp(18px, 3vw, 28px);
}

.page-about .about-hero,
.page-about .about-origin,
.page-about .about-era,
.page-about .about-team,
.page-about .about-flow,
.page-about .about-eco,
.page-about .about-close {
  padding-top: clamp(48px, 7vw, 92px);
  padding-bottom: clamp(48px, 7vw, 92px);
  position: relative;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(110% 80% at 18% 0%, rgba(78, 240, 190, 0.1), transparent 62%),
    radial-gradient(80% 70% at 100% 8%, rgba(154, 140, 255, 0.08), transparent 66%);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  display: grid;
  gap: clamp(28px, 4vw, 48px);
}

.page-about .about-hero__eyebrow {
  color: var(--cyan);
  letter-spacing: 0.18em;
}

.page-about .about-hero__title {
  margin: 16px 0 0;
  font-size: clamp(2.25rem, 7vw, 5rem);
  line-height: 1.04;
  letter-spacing: -0.02em;
  font-weight: 800;
  color: var(--paper);
}

.page-about .about-hero__title em {
  font-style: normal;
  color: var(--cyan);
  box-shadow: inset 0 -0.12em 0 rgba(78, 240, 190, 0.28);
}

.page-about .about-hero__lede {
  margin: clamp(20px, 3vw, 30px) 0 0;
  max-width: 52ch;
  font-size: var(--fs-b);
  line-height: 1.95;
  color: var(--mist);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(24px, 3.4vw, 34px);
}

.page-about .about-hero__side {
  border-top: 1px solid var(--line);
  padding-top: 18px;
}

.page-about .about-hero__side-title {
  margin: 0 0 10px;
  font-size: var(--fs-c);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--stand);
}

.page-about .about-facts {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-facts__item {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 13px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-facts__num {
  font-family: var(--mono);
  font-size: 1.5rem;
  letter-spacing: -0.01em;
  color: var(--flare);
  font-variant-numeric: tabular-nums;
}

.page-about .about-facts__label {
  font-size: var(--fs-n);
  color: var(--stand);
}

/* ---------- 色带 ---------- */
.page-about .about-bandline {
  height: 8px;
  background: linear-gradient(90deg, var(--turf), var(--night) 58%, var(--cyan) 100%);
  opacity: 0.55;
}

/* ---------- 章节通用 ---------- */
.page-about .chapter {
  margin-bottom: clamp(28px, 4vw, 46px);
}

/* ---------- 01 起点 ---------- */
.page-about .about-origin__grid {
  display: grid;
  gap: clamp(24px, 3.4vw, 44px);
}

.page-about .about-origin__text p {
  margin: 0 0 18px;
  font-size: var(--fs-b);
  line-height: 1.95;
  color: var(--mist);
}

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

.page-about .about-origin__text p:first-child::first-letter {
  float: left;
  font-size: 3rem;
  line-height: 0.86;
  margin: 6px 12px 0 0;
  font-weight: 800;
  color: var(--cyan);
}

.page-about .about-origin__note {
  align-self: start;
  font-size: var(--fs-b);
  line-height: 1.85;
}

/* ---------- 02 赛季时间线 ---------- */
.page-about .about-era__grid {
  display: grid;
  gap: clamp(22px, 3vw, 40px);
}

.page-about .about-era__marks {
  list-style: none;
  margin: 0;
  padding: 0 0 8px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-era__marks > li {
  flex: 0 0 auto;
}

.page-about .about-era__mark {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 13px;
  border: 1px solid var(--line);
  border-radius: 2px;
  text-decoration: none;
  color: var(--stand);
  font-size: var(--fs-c);
  letter-spacing: 0.1em;
  white-space: nowrap;
  transition: border-color 0.25s var(--ease), color 0.25s var(--ease);
}

.page-about .about-era__dot {
  width: 7px;
  height: 7px;
  flex: 0 0 auto;
  border-radius: 50%;
  background: var(--line);
  border: 1px solid var(--stand);
  transition: background 0.25s var(--ease), box-shadow 0.25s var(--ease);
}

.page-about .about-era__meta {
  font-size: var(--fs-c);
  color: var(--stand);
  opacity: 0.75;
}

.page-about .about-era__mark:hover,
.page-about .about-era__mark:focus-visible {
  border-color: var(--cyan);
  color: var(--mist);
}

.page-about .about-era__mark[aria-current] .about-era__dot {
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(78, 240, 190, 0.16);
}

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

.page-about .about-era__items {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(16px, 2.4vw, 24px);
}

.page-about .about-era__item {
  position: relative;
  padding: 22px 20px 24px;
  border: 1px solid var(--line);
  border-left: 2px solid var(--line);
  background: linear-gradient(180deg, rgba(10, 29, 24, 0.9), rgba(5, 15, 12, 0.35));
  transition: border-color 0.3s var(--ease), transform 0.3s var(--ease);
}

.page-about .about-era__item:hover {
  border-left-color: var(--cyan);
  transform: translateX(2px);
}

.page-about .about-era__season {
  margin: 0 0 8px;
  font-family: var(--mono);
  font-size: var(--fs-c);
  letter-spacing: 0.16em;
  color: var(--flare);
}

.page-about .about-era__name {
  margin: 0 0 10px;
  font-size: var(--fs-s);
  line-height: 1.4;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-era__text {
  margin: 0;
  font-size: var(--fs-b);
  line-height: 1.85;
  color: var(--mist);
}

/* ---------- 03 团队 ---------- */
.page-about .about-team__grid {
  display: grid;
  gap: clamp(24px, 3.4vw, 44px);
}

.page-about .about-team__figure {
  margin: 0;
}

.page-about .about-team__lead {
  margin: 0 0 16px;
  font-size: var(--fs-t);
  line-height: 1.75;
  color: var(--paper);
}

.page-about .about-team__text {
  margin: 0;
  font-size: var(--fs-b);
  line-height: 1.95;
  color: var(--mist);
}

.page-about .about-split {
  list-style: none;
  margin: clamp(22px, 3vw, 30px) 0 0;
  padding: 0;
}

.page-about .about-split__row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 5px 16px;
  padding: 15px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-split__name {
  font-size: var(--fs-b);
  color: var(--mist);
}

.page-about .about-split__num {
  font-family: var(--mono);
  font-size: var(--fs-b);
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .about-split__bar {
  grid-column: 1 / -1;
  display: block;
  width: var(--w, 0%);
  height: 6px;
  background: linear-gradient(90deg, var(--cyan), rgba(78, 240, 190, 0.22));
  transition: background 0.3s var(--ease);
}

.page-about .about-split__desc {
  grid-column: 1 / -1;
  margin-top: 4px;
  font-size: var(--fs-n);
  line-height: 1.7;
  color: var(--stand);
}

.page-about .about-split__row:hover .about-split__bar {
  background: linear-gradient(90deg, var(--flare), rgba(255, 138, 61, 0.25));
}

/* ---------- 04 流程 ---------- */
.page-about .about-flow__lead {
  max-width: 60ch;
  margin: 0 0 clamp(26px, 3.6vw, 40px);
  font-size: var(--fs-b);
  line-height: 1.95;
  color: var(--stand);
}

.page-about .about-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  max-width: 68ch;
}

.page-about .about-steps__item {
  position: relative;
  padding-left: 54px;
  padding-bottom: clamp(24px, 3vw, 34px);
}

.page-about .about-steps__item::before {
  content: "";
  position: absolute;
  left: 15px;
  top: 32px;
  bottom: 0;
  width: 1px;
  background: var(--line);
}

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

.page-about .about-steps__item:last-child::before {
  display: none;
}

.page-about .about-steps__num {
  position: absolute;
  left: 0;
  top: 0;
  width: 31px;
  height: 31px;
  display: grid;
  place-items: center;
  font-family: var(--mono);
  font-size: var(--fs-n);
  color: var(--flare);
  border: 1px solid var(--line);
  background: var(--void);
  font-variant-numeric: tabular-nums;
}

.page-about .about-steps__name {
  margin: 2px 0 8px;
  font-size: var(--fs-t);
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-steps__text {
  margin: 0;
  font-size: var(--fs-b);
  line-height: 1.9;
  color: var(--mist);
}

/* ---------- 05 覆盖与合作 ---------- */
.page-about .about-eco__grid {
  display: grid;
  gap: clamp(22px, 3vw, 36px);
}

.page-about .about-eco__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-stat {
  background: var(--night);
  padding: 22px 18px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .about-stat__num {
  font-family: var(--mono);
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--paper);
  font-variant-numeric: tabular-nums;
}

.page-about .about-stat__label {
  font-size: var(--fs-c);
  letter-spacing: 0.12em;
  color: var(--stand);
}

.page-about .about-eco__figure {
  margin: 0;
}

.page-about .about-eco__text {
  margin-top: clamp(24px, 3.4vw, 40px);
  display: grid;
  gap: 16px;
}

.page-about .about-eco__text p {
  margin: 0;
  max-width: 66ch;
  font-size: var(--fs-b);
  line-height: 1.95;
  color: var(--mist);
}

.page-about .about-tags {
  margin-top: clamp(26px, 3.6vw, 40px);
}

/* ---------- 06 收束 ---------- */
.page-about .about-close__grid {
  display: grid;
  gap: clamp(28px, 4vw, 52px);
}

.page-about .about-close__lead {
  margin: 0 0 18px;
  font-size: var(--fs-t);
  line-height: 1.75;
  color: var(--paper);
}

.page-about .about-close__text p {
  margin: 0 0 16px;
  font-size: var(--fs-b);
  line-height: 1.95;
  color: var(--mist);
  max-width: 58ch;
}

.page-about .about-close__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 30px);
}

.page-about .about-close__figure {
  margin: 0;
  align-self: end;
}

/* ---------- 图片通用 ---------- */
.page-about .img-frame__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

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

  .page-about .about-eco__text {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px 36px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    align-items: end;
  }

  .page-about .about-hero__side {
    border-top: 0;
    border-left: 1px solid var(--line);
    padding-top: 0;
    padding-left: clamp(20px, 2.6vw, 32px);
  }

  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, 1.7fr) minmax(0, 1fr);
    align-items: start;
  }

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

  .page-about .about-eco__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr);
    align-items: stretch;
  }

  .page-about .about-close__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
    align-items: end;
  }
}

@media (min-width: 960px) {
  .page-about .about-era__grid {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(32px, 4vw, 64px);
  }

  .page-about .about-era__rail {
    position: sticky;
    top: calc(var(--bar-h) + 36px);
    align-self: start;
  }

  .page-about .about-era__marks {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding: 0;
    position: relative;
  }

  .page-about .about-era__marks::before {
    content: "";
    position: absolute;
    left: 7px;
    top: 16px;
    bottom: 16px;
    width: 1px;
    background: var(--line);
  }

  .page-about .about-era__mark {
    position: relative;
    display: grid;
    grid-template-columns: 16px minmax(0, 1fr);
    grid-template-areas:
      "dot label"
      "dot meta";
    gap: 3px 12px;
    padding: 10px 0;
    border: 0;
    border-radius: 0;
    white-space: normal;
    align-items: start;
  }

  .page-about .about-era__dot {
    grid-area: dot;
    width: 9px;
    height: 9px;
    margin: 6px 0 0 3px;
  }

  .page-about .about-era__label {
    grid-area: label;
    font-size: var(--fs-n);
    letter-spacing: 0.08em;
    color: var(--mist);
  }

  .page-about .about-era__meta {
    grid-area: meta;
    font-size: var(--fs-c);
  }

  .page-about .about-era__mark:hover,
  .page-about .about-era__mark:focus-visible {
    border: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-era__item,
  .page-about .about-era__dot,
  .page-about .about-split__bar,
  .page-about .about-era__mark {
    transition: none;
  }

  .page-about .about-era__item:hover {
    transform: none;
  }
}
<<<END>>>

.page-about {
  --w: 1rem;
}