.page-about {
  --ab-rule: rgba(217, 205, 180, .2);
}

.page-about .ab-hero {
  position: relative;
  overflow: hidden;
  padding: 30px 0 56px;
  background:
    radial-gradient(880px 460px at 88% -14%, rgba(198, 255, 61, .16), transparent 66%),
    linear-gradient(180deg, var(--ink) 0%, var(--pitch) 100%);
  border-bottom: 1px solid var(--line);
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, var(--line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--line) 1px, transparent 1px);
  background-size: 96px 96px;
  opacity: .55;
  pointer-events: none;
}

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

.page-about .ab-hero .crumbs {
  margin-bottom: 28px;
}

.page-about .ab-hero__grid {
  display: grid;
  gap: 34px;
  align-items: start;
}

.page-about .ab-hero__lead .display {
  margin: 12px 0 18px;
  max-width: 15em;
}

.page-about .ab-hero__lead .lede {
  max-width: var(--measure);
  color: var(--mist);
}

.page-about .ab-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .ab-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.page-about .ab-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 16px 14px;
  border: 1px solid var(--ab-rule);
  border-radius: var(--radius-md);
  background: rgba(23, 69, 58, .34);
}

.page-about .ab-stat__num {
  font-size: 30px;
  font-weight: 600;
  line-height: 1.05;
  color: var(--lime);
  letter-spacing: -.01em;
}

.page-about .ab-stat__unit {
  font-size: 15px;
  margin-left: 2px;
  color: var(--lime-deep);
}

.page-about .ab-stat__label {
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--mist);
}

/* ---------- 章节骨架 ---------- */

.page-about .ab-sec {
  position: relative;
}

.page-about .ab-sec__head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 20px;
}

.page-about .ab-sec__num {
  flex: none;
  font-family: var(--font-mono);
  font-size: 46px;
  font-weight: 600;
  line-height: .88;
  color: var(--lime);
  opacity: .2;
  transform: translateY(-2px);
}

.page-about .ab-sec__title {
  font-size: 26px;
  line-height: 1.32;
  letter-spacing: -.01em;
  margin: 0;
}

.page-about .ab-sec__intro {
  max-width: var(--measure);
  color: var(--mist);
  margin-bottom: 26px;
}

/* ---------- 01 起源 ---------- */

.page-about .ab-origin {
  display: grid;
  gap: 24px;
}

.page-about .ab-origin__text p + p {
  margin-top: 14px;
}

.page-about .ab-origin__quote {
  border-left: 3px solid var(--lime);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  padding: 18px 20px;
  background: linear-gradient(120deg, rgba(198, 255, 61, .1), rgba(198, 255, 61, 0));
}

.page-about .ab-origin__q {
  font-size: 17px;
  font-weight: 600;
  line-height: 1.65;
  color: var(--white);
}

.page-about .ab-origin__note {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 02 时间线 ---------- */

.page-about .ab-scale {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 14px;
  padding: 12px 0 14px;
  margin-bottom: 22px;
  border-top: 1px solid var(--ab-rule);
  border-bottom: 1px solid var(--ab-rule);
}

.page-about .ab-scale__cap {
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--mist);
  text-transform: uppercase;
}

.page-about .ab-scale__track {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 2px;
  scrollbar-width: none;
}

.page-about .ab-scale__track::-webkit-scrollbar {
  display: none;
}

.page-about .ab-year {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  flex: none;
  padding: 6px 14px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  color: var(--paper);
  text-decoration: none;
  transition: border-color .2s ease, color .2s ease, background-color .2s ease;
}

.page-about .ab-year__dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--lime);
}

.page-about .ab-year:hover,
.page-about .ab-year:focus-visible {
  border-color: var(--lime);
  color: var(--lime);
  background: rgba(198, 255, 61, .08);
}

.page-about .ab-tl {
  display: grid;
  gap: 24px;
}

.page-about .ab-tl__figure {
  margin: 0;
}

.page-about .ab-tl__figure .media {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--ab-rule);
}

.page-about .ab-tl__track {
  display: flex;
  gap: 14px;
  overflow-x: auto;
  padding: 4px 2px 16px;
  scroll-snap-type: x mandatory;
  scrollbar-width: thin;
}

.page-about .ab-card {
  flex: 0 0 82%;
  scroll-snap-align: start;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 20px 18px;
  border-radius: var(--radius-md);
  border: 1px solid var(--ab-rule);
  background: linear-gradient(160deg, var(--pitch-mid) 0%, rgba(15, 43, 34, .9) 100%);
}

.page-about .ab-card__year {
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--lime);
  margin: 0;
}

.page-about .ab-card .card__title {
  font-size: 17px;
  line-height: 1.45;
  margin: 0;
}

.page-about .ab-card .card__body {
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist);
  margin: 0;
}

/* ---------- 03 纸面流程 ---------- */

.page-about .ab-paper {
  background: var(--paper);
  color: #232B26;
  border-radius: var(--radius-lg);
  padding: 26px 18px 30px;
  box-shadow: 0 24px 60px rgba(0, 0, 0, .35);
}

.page-about .ab-sec__head--paper {
  margin-bottom: 18px;
}

.page-about .ab-sec__num--paper {
  color: #2F3A33;
  opacity: .22;
}

.page-about .ab-sec__title--paper {
  color: #1A211C;
}

.page-about .ab-paper__figure {
  margin: 0 0 20px;
}

.page-about .ab-paper__figure .media {
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--paper-shadow);
}

.page-about .ab-paper__figure .media__cap {
  color: #55605A;
}

.page-about .ab-paper__body p {
  font-size: 16px;
  line-height: 1.8;
  color: #2A332D;
}

.page-about .ab-paper__body p + p {
  margin-top: 12px;
}

.page-about .ab-flow {
  list-style: none;
  display: grid;
  gap: 12px;
  margin: 24px 0 0;
  padding: 0;
}

.page-about .ab-flow__step {
  position: relative;
  padding: 16px 18px;
  border-radius: var(--radius-md);
  background: #FFFFFF;
  border: 1px solid var(--paper-shadow);
}

.page-about .ab-flow__idx {
  display: block;
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--lime-deep);
  margin-bottom: 6px;
}

.page-about .ab-flow__name {
  font-size: 16px;
  font-weight: 700;
  color: #1A211C;
  margin: 0 0 6px;
}

.page-about .ab-flow__desc {
  font-size: 14px;
  line-height: 1.75;
  color: #4B554F;
  margin: 0;
}

/* ---------- 04 覆盖 ---------- */

.page-about .ab-leagues {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin: 0 0 28px;
  padding: 0;
}

.page-about .ab-league {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--ab-rule);
  background: rgba(23, 69, 58, .3);
}

.page-about .ab-league__name {
  font-size: 15px;
  font-weight: 600;
  color: var(--white);
}

.page-about .ab-league__tag {
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--lime-deep);
}

.page-about .ab-ritmo {
  display: grid;
  gap: 14px;
}

.page-about .ab-ritmo__item {
  padding: 18px;
  border-radius: var(--radius-md);
  border: 1px solid var(--ab-rule);
  border-top: 2px solid var(--lime);
  background: var(--ink-deep);
}

.page-about .ab-ritmo__num {
  font-size: 26px;
  font-weight: 600;
  line-height: 1.1;
  color: var(--lime);
  margin: 0 0 4px;
}

.page-about .ab-ritmo__label {
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--white);
  margin: 0 0 8px;
}

.page-about .ab-ritmo__desc {
  font-size: 14px;
  line-height: 1.72;
  color: var(--mist);
  margin: 0;
}

/* ---------- 05 合作 ---------- */

.page-about .ab-coop {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-lg);
  border: 1px solid var(--ab-rule);
  background: var(--pitch);
}

.page-about .ab-coop__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .26;
  pointer-events: none;
}

.page-about .ab-coop__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 24px;
  padding: 26px 18px;
  background: linear-gradient(180deg, rgba(11, 15, 13, .55) 0%, rgba(11, 15, 13, .88) 100%);
}

.page-about .ab-coop__text p {
  font-size: 15px;
  line-height: 1.82;
  color: var(--white);
}

.page-about .ab-coop__text p + p {
  margin-top: 12px;
  color: var(--mist);
}

.page-about .ab-coop__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--ab-rule);
  border: 1px solid var(--ab-rule);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.page-about .ab-coop__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 13px 15px;
  background: rgba(11, 15, 13, .82);
}

.page-about .ab-coop__k {
  font-size: 13px;
  color: var(--mist);
  letter-spacing: .04em;
}

.page-about .ab-coop__v {
  font-size: 13px;
  font-weight: 600;
  color: var(--lime);
  text-align: right;
}

/* ---------- 06 下一步 ---------- */

.page-about .ab-sec--next {
  background:
    radial-gradient(700px 340px at 12% 0%, rgba(198, 255, 61, .1), transparent 68%);
}

.page-about .ab-next {
  margin-bottom: 26px;
}

.page-about .ab-next__col {
  padding: 20px 18px;
  border-radius: var(--radius-md);
  border: 1px solid var(--ab-rule);
  background: rgba(15, 43, 34, .55);
}

.page-about .ab-next__h {
  font-size: 17px;
  margin: 0 0 10px;
  color: var(--white);
}

.page-about .ab-next__p {
  font-size: 14px;
  line-height: 1.78;
  color: var(--mist);
  margin: 0;
}

.page-about .ab-next__cta {
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding-top: 22px;
  border-top: 1px solid var(--ab-rule);
}

.page-about .ab-next__note {
  font-size: 15px;
  line-height: 1.78;
  color: var(--mist);
  margin: 0;
}

.page-about .ab-next__note a {
  color: var(--lime);
  text-decoration: underline;
  text-underline-offset: 3px;
}

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

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-about .ab-sec__num {
    font-size: 56px;
  }

  .page-about .ab-sec__title {
    font-size: 30px;
  }

  .page-about .ab-leagues {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .ab-ritmo {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .ab-paper {
    padding: 32px 28px 36px;
  }

  .page-about .ab-flow {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 10px;
  }

  .page-about .ab-flow__step::after {
    content: "";
    position: absolute;
    top: 30px;
    right: -10px;
    width: 10px;
    height: 1px;
    background: var(--paper-shadow);
  }

  .page-about .ab-flow__step:last-child::after {
    display: none;
  }

  .page-about .ab-card {
    flex-basis: 300px;
  }

  .page-about .ab-coop__inner {
    padding: 30px 26px;
  }

  .page-about .ab-next__cta {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }

  .page-about .ab-next__note {
    max-width: 42ch;
  }
}

@media (min-width: 980px) {
  .page-about .ab-hero {
    padding: 38px 0 72px;
  }

  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 1.18fr) minmax(0, .82fr);
    gap: 48px;
  }

  .page-about .ab-hero__stats {
    margin-top: 8px;
  }

  .page-about .ab-sec__num {
    font-size: 68px;
  }

  .page-about .ab-sec__title {
    font-size: 34px;
  }

  .page-about .ab-origin {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, .6fr);
    gap: 40px;
  }

  .page-about .ab-tl {
    grid-template-columns: 300px minmax(0, 1fr);
    gap: 30px;
    align-items: start;
  }

  .page-about .ab-tl__track {
    padding-bottom: 18px;
  }

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

  .page-about .ab-coop__inner {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, .65fr);
    gap: 36px;
    align-items: center;
    padding: 38px 34px;
  }

  .page-about .ab-paper {
    padding: 40px 40px 44px;
  }

  .page-about .ab-sec__intro {
    margin-bottom: 30px;
  }
}
<<<END>>>