.page-about {
  --ab-tilt: -4.5deg;
  --ab-glass-bg: rgba(247, 249, 250, .06);
  --ab-glass-line: rgba(247, 249, 250, .16);
  --ab-rice-shadow: 0 1px 0 rgba(20, 24, 32, .06), 0 12px 28px rgba(0, 0, 0, .22);
  display: block;
}

/* ---------- 首屏 ---------- */
.page-about .ab-open {
  padding-top: 26px;
}

.page-about .ab-open__grid {
  display: grid;
  gap: 26px;
  margin-top: 16px;
}

.page-about .ab-open__lead h1 {
  margin: 10px 0 14px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.85rem, 6.2vw, 3.35rem);
  line-height: 1.06;
  letter-spacing: -.022em;
  color: var(--snow);
}

.page-about .ab-open__lead .lede {
  max-width: 42rem;
  margin: 0;
  color: var(--snow-70);
  line-height: 1.78;
  font-size: 1rem;
}

.page-about .ab-open__pointer {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 22px 0 0;
}

.page-about .ab-open__map {
  padding: 18px 16px 20px;
  border: 1px solid var(--ab-glass-line);
  border-radius: var(--radius);
  background: var(--ab-glass-bg);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
}

.page-about .ab-open__map-title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--sunset);
}

.page-about .ab-open__map .index-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .ab-open__map .index-item a {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 8px;
  border-radius: 3px;
  color: var(--snow-70);
  text-decoration: none;
  font-size: .9375rem;
  line-height: 1.5;
  border-left: 2px solid transparent;
  transition: color .16s var(--ease), background .16s var(--ease), border-color .16s var(--ease);
}

.page-about .ab-open__map .index-item a:hover,
.page-about .ab-open__map .index-item a:focus-visible {
  color: var(--snow);
  background: rgba(78, 140, 138, .14);
  border-left-color: var(--glacier);
}

.page-about .ab-open__map .index-item__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--clay);
  flex: 0 0 auto;
}

@media (min-width: 900px) {
  .page-about .ab-open {
    padding-top: 34px;
  }
  .page-about .ab-open__grid {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    gap: 44px;
    align-items: start;
  }
}

/* ---------- 章节头 ---------- */
.page-about .ab-sechead {
  display: grid;
  gap: 8px;
  margin-bottom: 24px;
  max-width: 34rem;
}

.page-about .ab-sechead__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--clay);
}

.page-about .ab-sechead__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.35rem, 4.6vw, 2.05rem);
  line-height: 1.14;
  letter-spacing: -.022em;
  color: var(--snow);
}

.page-about .ab-sechead__note {
  margin: 0;
  color: var(--snow-55);
  line-height: 1.75;
  font-size: .9375rem;
}

/* ---------- 图片容器 ---------- */
.page-about .media-frame {
  position: relative;
  margin: 0;
  overflow: hidden;
  border-radius: var(--radius);
  border: 1px solid var(--snow-16);
  background:
    linear-gradient(168deg, rgba(22, 35, 58, .92) 0%, rgba(20, 24, 32, .96) 100%),
    repeating-linear-gradient(115deg, rgba(247, 249, 250, .05) 0 1px, transparent 1px 22px);
}

.page-about .media-frame img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  opacity: .92;
}

.page-about .media-frame__cap {
  position: absolute;
  left: 12px;
  bottom: 10px;
  padding: 4px 9px;
  border-radius: 2px;
  background: rgba(20, 24, 32, .78);
  color: var(--gold);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  text-transform: uppercase;
}

.page-about .ab-lineage__fig {
  margin-bottom: 8px;
}

.page-about .ab-channel__fig {
  margin-top: 28px;
}

.page-about .ab-team__fig {
  margin-top: 26px;
  max-width: 620px;
}

/* ---------- 斜向时间轴 ---------- */
.page-about .ab-axis {
  margin: 30px 0 0;
  padding: 4px 0;
}

.page-about .ab-axis__nodes {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .ab-node__inner {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .ab-node {
  padding: 16px 16px 18px;
  border-left: 2px solid var(--clay);
  border-radius: 0 var(--radius) var(--radius) 0;
  background: rgba(247, 249, 250, .045);
}

.page-about .ab-node__dot {
  display: none;
}

.page-about .ab-node__tag {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--clay);
}

.page-about .ab-node__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.0625rem;
  letter-spacing: -.01em;
  color: var(--snow);
}

.page-about .ab-node__desc {
  margin: 0;
  color: var(--snow-55);
  font-size: .875rem;
  line-height: 1.72;
}

@media (min-width: 900px) {
  .page-about .ab-axis {
    margin: 44px 0 12px;
    padding: 60px 0 44px;
  }

  .page-about .ab-axis__nodes {
    position: relative;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 0;
    transform: rotate(var(--ab-tilt));
    transform-origin: 50% 50%;
  }

  .page-about .ab-axis__nodes::before {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    top: 122px;
    height: 1px;
    background: linear-gradient(
      90deg,
      transparent 0%,
      var(--snow-16) 6%,
      var(--snow-16) 94%,
      transparent 100%
    );
  }

  .page-about .ab-node {
    padding: 0 14px;
    border-left: 0;
    border-radius: 0;
    background: transparent;
  }

  .page-about .ab-node__inner {
    display: grid;
    grid-template-rows: 116px 12px auto;
    gap: 0;
    padding: 0 4px;
    transform: rotate(calc(var(--ab-tilt) * -1));
    transform-origin: 50% 50%;
  }

  .page-about .ab-node__head {
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    gap: 6px;
    padding-bottom: 10px;
  }

  .page-about .ab-node__dot {
    display: block;
    align-self: center;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--clay);
    box-shadow: 0 0 0 4px rgba(180, 101, 63, .2);
  }

  .page-about .ab-node__desc {
    padding-top: 14px;
    font-size: .875rem;
  }
}

/* ---------- 通道变更 ---------- */
.page-about .ab-channel__grid {
  display: grid;
  gap: 26px;
}

.page-about .ab-channel__para {
  margin: 0 0 14px;
  color: var(--snow-70);
  line-height: 1.78;
}

.page-about .ab-channel__para:last-of-type {
  margin-bottom: 0;
}

.page-about .ab-path-compare {
  display: grid;
  gap: 14px;
  margin-top: 24px;
}

.page-about .ab-path {
  padding: 18px 18px 20px;
  border-radius: var(--radius);
  border: 1px solid var(--snow-16);
  background: rgba(247, 249, 250, .04);
  transition: border-color .16s var(--ease), background .16s var(--ease), transform .16s var(--ease);
}

.page-about .ab-path:hover,
.page-about .ab-path:focus-visible,
.page-about .ab-path:focus-within {
  outline: none;
  transform: translateY(-3px);
}

.page-about .ab-path--old {
  border-color: rgba(180, 101, 63, .42);
  background: rgba(180, 101, 63, .08);
}

.page-about .ab-path--old:hover,
.page-about .ab-path--old:focus-visible {
  border-color: var(--clay);
  background: rgba(180, 101, 63, .16);
}

.page-about .ab-path--new {
  border-color: rgba(224, 122, 52, .45);
  background: rgba(224, 122, 52, .08);
}

.page-about .ab-path--new:hover,
.page-about .ab-path--new:focus-visible {
  border-color: var(--sunset);
  background: rgba(224, 122, 52, .16);
}

.page-about .ab-path__label {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--gold);
}

.page-about .ab-path__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.0625rem;
  color: var(--snow);
}

.page-about .ab-path__desc {
  margin: 0;
  color: var(--snow-55);
  font-size: .875rem;
  line-height: 1.7;
}

.page-about .ab-channel__aside {
  padding: 20px 18px 22px;
  border: 1px solid var(--ab-glass-line);
  border-radius: var(--radius);
  background: var(--ab-glass-bg);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
}

.page-about .ab-aside__label {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--glacier);
}

.page-about .ab-aside__text {
  margin: 0 0 12px;
  color: var(--snow-70);
  font-size: .9375rem;
  line-height: 1.75;
}

.page-about .ab-aside__links {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin: 16px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--snow-16);
}

.page-about .ab-aside__links a {
  color: var(--glacier);
  text-decoration: none;
  font-size: .9375rem;
  border-bottom: 1px solid rgba(78, 140, 138, .35);
  padding-bottom: 2px;
  align-self: flex-start;
  transition: color .16s var(--ease), border-color .16s var(--ease);
}

.page-about .ab-aside__links a:hover,
.page-about .ab-aside__links a:focus-visible {
  color: var(--snow);
  border-color: var(--snow-40);
}

@media (min-width: 700px) {
  .page-about .ab-path-compare {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .ab-channel__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    gap: 38px;
    align-items: start;
  }
  .page-about .ab-channel__aside {
    margin-top: -30px;
    transform: translateX(12px);
  }
}

/* ---------- 维护分工 ---------- */
.page-about .filter-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--snow-16);
}

.page-about .filter-btn {
  padding: 7px 14px;
  border: 1px solid var(--snow-16);
  border-radius: 999px;
  background: transparent;
  color: var(--snow-55);
  font-family: var(--font-display);
  font-size: .8125rem;
  letter-spacing: .02em;
  cursor: pointer;
  transition: color .16s var(--ease), border-color .16s var(--ease), background .16s var(--ease);
}

.page-about .filter-btn:hover,
.page-about .filter-btn:focus-visible {
  color: var(--snow);
  border-color: var(--snow-40);
  outline: none;
}

.page-about .filter-btn[aria-pressed="true"] {
  color: var(--indigo);
  background: var(--glacier);
  border-color: var(--glacier);
}

.page-about .filter-bar__count {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--stone);
}

.page-about .ab-team__grid {
  display: grid;
  gap: 16px;
  margin-top: 22px;
}

.page-about .ab-team__card {
  position: relative;
  padding: 20px 18px 22px;
  border-radius: var(--radius);
  background: var(--rice);
  color: var(--indigo);
  box-shadow: var(--ab-rice-shadow);
}

.page-about .ab-team__card:nth-child(2) {
  transform: translateY(6px);
}

.page-about .ab-team__card:nth-child(3) {
  transform: translateX(5px);
}

.page-about .ab-team__idx {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.5rem;
  line-height: 1;
  letter-spacing: .04em;
  color: var(--clay);
}

.page-about .ab-team__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.0625rem;
  letter-spacing: -.01em;
  color: var(--indigo);
}

.page-about .ab-team__desc {
  margin: 0;
  font-size: .875rem;
  line-height: 1.72;
  color: #3d4652;
}

@media (min-width: 700px) {
  .page-about .ab-team__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px 22px;
  }
}

@media (min-width: 1024px) {
  .page-about .ab-team__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 更新节奏 ---------- */
.page-about .ab-tick {
  list-style: none;
  margin: 0;
  padding: 0 0 0 22px;
  position: relative;
  display: grid;
  gap: 26px;
}

.page-about .ab-tick::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 6px;
  bottom: 6px;
  width: 1px;
  background: linear-gradient(180deg, var(--clay) 0%, var(--gold) 55%, transparent 100%);
}

.page-about .ab-tick__item {
  position: relative;
  padding: 2px 0 0;
}

.page-about .ab-tick__item::before {
  content: "";
  position: absolute;
  left: -22px;
  top: 9px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 3px rgba(217, 163, 60, .18);
}

.page-about .ab-tick__when {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: .9375rem;
  letter-spacing: .06em;
  color: var(--sunset);
}

.page-about .ab-tick__what {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.0625rem;
  letter-spacing: -.01em;
  color: var(--snow);
}

.page-about .ab-tick__desc {
  margin: 0;
  max-width: 44rem;
  color: var(--snow-55);
  font-size: .9375rem;
  line-height: 1.75;
}

@media (min-width: 900px) {
  .page-about .ab-tick {
    gap: 20px;
    padding-left: 26px;
  }
  .page-about .ab-tick__item {
    display: grid;
    grid-template-columns: 168px minmax(0, 1fr);
    grid-template-areas:
      "when what"
      "when desc";
    column-gap: 24px;
    align-items: start;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--snow-08);
  }
  .page-about .ab-tick__item:last-child {
    border-bottom: 0;
    padding-bottom: 0;
  }
  .page-about .ab-tick__when {
    grid-area: when;
    margin-top: 4px;
  }
  .page-about .ab-tick__what {
    grid-area: what;
  }
  .page-about .ab-tick__desc {
    grid-area: desc;
  }
}

/* ---------- 地区适配 ---------- */
.page-about .ab-region__grid {
  display: grid;
  gap: 26px;
}

.page-about .ab-region__para {
  margin: 0 0 14px;
  color: var(--snow-70);
  line-height: 1.78;
}

.page-about .ab-region__para:last-child {
  margin-bottom: 0;
}

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

.page-about .ab-stat {
  padding: 18px 18px 20px;
  border-radius: var(--radius);
  border: 1px solid var(--snow-16);
  background: rgba(247, 249, 250, .04);
}

.page-about .ab-stat--offset {
  border-color: rgba(224, 122, 52, .4);
  background: linear-gradient(150deg, rgba(224, 122, 52, .16), rgba(224, 122, 52, .04));
  transform: translateX(6px);
}

.page-about .ab-stat--glass {
  border-color: var(--ab-glass-line);
  background: var(--ab-glass-bg);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
}

.page-about .ab-stat__num {
  display: flex;
  align-items: baseline;
  gap: 2px;
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-weight: 700;
  line-height: 1;
  color: var(--gold);
}

.page-about .ab-stat__unit {
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 700;
  color: var(--snow-55);
}

.page-about .ab-stat__label {
  margin: 0;
  font-size: .8125rem;
  letter-spacing: .08em;
  color: var(--snow-55);
}

@media (min-width: 640px) {
  .page-about .ab-region__stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .ab-region__grid {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 1fr);
    gap: 44px;
    align-items: start;
  }
  .page-about .ab-region__stats {
    grid-template-columns: minmax(0, 1fr);
    gap: 16px;
  }
}

/* ---------- 下一步 ---------- */
.page-about .ab-next__grid {
  display: grid;
  gap: 14px;
}

.page-about .ab-next__card {
  display: grid;
  gap: 8px;
  padding: 20px 18px 22px;
  border-radius: var(--radius);
  border: 1px solid var(--snow-16);
  background: rgba(247, 249, 250, .04);
  text-decoration: none;
  transition: border-color .16s var(--ease), background .16s var(--ease), transform .16s var(--ease);
}

.page-about .ab-next__card:hover,
.page-about .ab-next__card:focus-visible {
  outline: none;
  transform: translateY(-4px);
  border-color: var(--glacier);
  background: rgba(78, 140, 138, .12);
}

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

.page-about .ab-next__t {
  font-size: .9375rem;
  line-height: 1.7;
  color: var(--snow-70);
}

.page-about .ab-next__go {
  margin-top: 4px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: .875rem;
  color: var(--glacier);
}

.page-about .ab-next__card:hover .ab-next__go,
.page-about .ab-next__card:focus-visible .ab-next__go {
  color: var(--sunset);
}

@media (min-width: 760px) {
  .page-about .ab-next__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }
}

/* ---------- 窄屏兜底 ---------- */
@media (max-width: 480px) {
  .page-about .ab-open__pointer {
    flex-direction: column;
    align-items: stretch;
  }
  .page-about .ab-open__pointer .btn {
    text-align: center;
  }
  .page-about .ab-team__card:nth-child(2),
  .page-about .ab-team__card:nth-child(3),
  .page-about .ab-stat--offset {
    transform: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-path,
  .page-about .ab-next__card,
  .page-about .ab-node__inner,
  .page-about .ab-axis__nodes {
    transition: none;
  }
  .page-about .ab-path:hover,
  .page-about .ab-path:focus-visible,
  .page-about .ab-next__card:hover,
  .page-about .ab-next__card:focus-visible {
    transform: none;
  }
}
<<<END>>>