.page-about {
  --ab-rail: 64px;
  --ab-line: rgba(30, 44, 85, 0.42);
  position: relative;
  background-color: var(--ink);
  background-image:
    repeating-linear-gradient(0deg, var(--ab-line) 0 1px, transparent 1px 88px),
    repeating-linear-gradient(90deg, var(--ab-line) 0 1px, transparent 1px 88px);
  color: var(--cream);
  padding-bottom: clamp(40px, 7vw, 88px);
  overflow-x: clip;
}

.page-about .breadcrumb {
  padding-top: clamp(18px, 3vw, 32px);
}

/* ---------- 首屏 ---------- */

.page-about .ab-hero {
  position: relative;
  padding: clamp(26px, 5vw, 62px) 0 clamp(34px, 6vw, 72px);
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  inset: 0 0 0 auto;
  width: min(52%, 560px);
  background: radial-gradient(120% 88% at 100% 4%, rgba(44, 229, 216, 0.16), rgba(44, 229, 216, 0) 64%);
  pointer-events: none;
}

.page-about .ab-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(26px, 4vw, 44px);
  align-items: end;
}

.page-about .ab-hero__lead .eyebrow {
  display: block;
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--cyan);
}

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

.page-about .ab-hero__intro {
  max-width: 58ch;
  margin: 0;
  font-size: 17px;
  line-height: 1.85;
  color: rgba(242, 239, 230, 0.84);
}

.page-about .ab-facts {
  list-style: none;
  margin: 0;
  padding: 1px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--grid);
  border: 1px solid var(--grid);
}

.page-about .ab-facts__item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 14px;
  background: rgba(7, 12, 31, 0.92);
}

.page-about .ab-facts__val {
  font-family: var(--font-mono);
  font-size: clamp(20px, 3.2vw, 27px);
  letter-spacing: 0.02em;
  color: var(--cyan);
}

.page-about .ab-facts__key {
  font-size: 13px;
  line-height: 1.5;
  color: var(--stone);
}

@media (min-width: 960px) {
  .page-about .ab-hero__inner {
    grid-template-columns: minmax(0, 1.5fr) minmax(280px, 0.9fr);
  }
}

/* ---------- 章节骨架 ---------- */

.page-about .ab-sec {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  padding: clamp(48px, 8vw, 108px) 0 clamp(36px, 5vw, 72px);
  border-top: 1px solid var(--ab-line);
}

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

.page-about .ab-sec__body {
  min-width: 0;
}

@media (min-width: 760px) {
  .page-about .ab-sec {
    grid-template-columns: var(--ab-rail) minmax(0, 1fr);
    gap: clamp(16px, 3vw, 40px);
  }

  .page-about .ab-sec__rail {
    display: block;
    position: relative;
  }

  .page-about .ab-sec__rail::after {
    content: "";
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    width: 1px;
    background: linear-gradient(180deg, rgba(44, 229, 216, 0.5), rgba(30, 44, 85, 0.2) 42%, rgba(30, 44, 85, 0) 100%);
  }

  .page-about .ab-sec__num {
    position: sticky;
    top: calc(var(--head-h) + 28px);
    display: block;
    padding-right: 14px;
    writing-mode: vertical-rl;
    text-orientation: mixed;
    font-family: var(--font-mono);
    font-size: 12px;
    letter-spacing: 0.3em;
    color: var(--cyan);
    white-space: nowrap;
  }
}

/* ---------- 通用文字 ---------- */

.page-about .ab-title {
  position: relative;
  margin: 0 0 20px;
  padding-left: 20px;
  font-size: clamp(23px, 3.6vw, 37px);
  line-height: 1.3;
  letter-spacing: -0.01em;
}

.page-about .ab-title::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.16em;
  bottom: 0.16em;
  width: 6px;
  background: var(--cyan);
  transform: skewX(-9deg);
}

.page-about .ab-p {
  max-width: 68ch;
  margin: 0 0 16px;
  font-size: 17px;
  line-height: 1.85;
  color: rgba(242, 239, 230, 0.8);
}

.page-about .ab-p a {
  color: var(--cyan);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 4px;
}

.page-about .ab-p a:hover {
  color: var(--cream);
}

/* ---------- 图片框 ---------- */

.page-about .ab-frame {
  position: relative;
  margin: clamp(24px, 4vw, 40px) 0 0;
  border: 1px solid var(--grid);
  background: var(--ink-deep);
}

.page-about .ab-frame::before,
.page-about .ab-frame::after {
  content: "";
  position: absolute;
  width: 18px;
  height: 18px;
  border: 2px solid var(--cyan);
  pointer-events: none;
}

.page-about .ab-frame::before {
  top: -1px;
  left: -1px;
  border-right: 0;
  border-bottom: 0;
}

.page-about .ab-frame::after {
  right: -1px;
  bottom: -1px;
  border-left: 0;
  border-top: 0;
}

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

.page-about .ab-frame__cap {
  padding: 12px 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--stone);
  border-top: 1px solid var(--grid);
}

/* ---------- 时间线 ---------- */

.page-about .ab-timeline {
  list-style: none;
  position: relative;
  margin: 30px 0 26px;
  padding: 0 0 0 30px;
}

.page-about .ab-timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--cyan), var(--turf) 52%, var(--clay));
}

.page-about .ab-tl {
  position: relative;
  padding-bottom: clamp(26px, 4vw, 44px);
}

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

.page-about .ab-tl::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 6px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--grid);
  transition: border-color 0.25s var(--ease), box-shadow 0.25s var(--ease);
}

.page-about .ab-tl:hover::before {
  border-color: var(--cyan);
  box-shadow: 0 0 0 5px rgba(44, 229, 216, 0.14);
}

.page-about .ab-tl__code {
  display: inline-block;
  margin-bottom: 8px;
  padding: 3px 9px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--ink);
  background: var(--turf);
}

.page-about .ab-tl__name {
  margin: 0 0 8px;
  font-size: 18px;
  line-height: 1.4;
  color: var(--cream);
}

.page-about .ab-tl__desc {
  max-width: 62ch;
  margin: 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: rgba(242, 239, 230, 0.72);
}

.page-about .ab-tl__desc a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 4px;
}

/* ---------- 团队 ---------- */

.page-about .ab-crew {
  list-style: none;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin: 28px 0 0;
  padding: 1px;
  background: var(--grid);
  border: 1px solid var(--grid);
}

.page-about .ab-crew__item {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 20px 16px;
  background: var(--ink-deep);
}

.page-about .ab-crew__num {
  font-family: var(--font-mono);
  font-size: clamp(28px, 4.4vw, 38px);
  letter-spacing: 0.02em;
  color: var(--amber);
}

.page-about .ab-crew__key {
  font-size: 14px;
  line-height: 1.6;
  color: var(--stone);
}

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

.page-about .ab-flow {
  list-style: none;
  counter-reset: abf;
  display: grid;
  gap: 12px;
  margin: 28px 0 24px;
  padding: 0;
}

.page-about .ab-flow li {
  position: relative;
  padding: 13px 16px 13px 54px;
  font-size: 15.5px;
  line-height: 1.75;
  color: rgba(242, 239, 230, 0.78);
  border-left: 3px solid var(--turf);
  background: linear-gradient(90deg, rgba(79, 139, 98, 0.14), rgba(79, 139, 98, 0));
}

.page-about .ab-flow li::before {
  counter-increment: abf;
  content: "0" counter(abf);
  position: absolute;
  left: 16px;
  top: 14px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--turf);
}

.page-about .ab-flow strong {
  color: var(--cream);
  font-weight: 600;
}

/* ---------- 频道筛选 ---------- */

.page-about .ab-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 28px 0 16px;
}

.page-about .filter-count {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--stone);
}

.page-about .ab-empty {
  margin: 0 0 14px;
  padding: 16px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--stone);
  border: 1px dashed var(--grid);
}

.page-about .ab-channels {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(146px, 1fr));
  gap: 10px;
  margin: 0;
  padding: 0;
}

.page-about .ab-channels li {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
  padding: 14px 14px 14px 16px;
  border: 1px solid var(--grid);
  background: rgba(7, 12, 31, 0.7);
  transition: border-color 0.22s var(--ease), transform 0.22s var(--ease);
}

.page-about .ab-channels li:hover {
  border-color: var(--cyan);
  transform: translateY(-2px);
}

.page-about .ab-channels li.is-main {
  border-left: 3px solid var(--cyan);
  background: rgba(44, 229, 216, 0.07);
}

.page-about .ab-ch__name {
  font-size: 16px;
  font-weight: 600;
  color: var(--cream);
}

.page-about .ab-ch__code {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--stone);
}

/* ---------- 覆盖数据 ---------- */

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

.page-about .ab-reach__item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 15px;
  background: rgba(7, 12, 31, 0.88);
}

.page-about .ab-reach__val {
  font-family: var(--font-mono);
  font-size: clamp(18px, 2.8vw, 24px);
  letter-spacing: 0.02em;
  color: var(--turf);
}

.page-about .ab-reach__key {
  font-size: 13px;
  line-height: 1.55;
  color: var(--stone);
}

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

/* ---------- 可靠性与合作 ---------- */

.page-about .ab-assure {
  list-style: none;
  display: grid;
  gap: 18px;
  margin: 28px 0 24px;
  padding: 0;
}

.page-about .ab-assure__item {
  padding: 2px 0 2px 18px;
  border-left: 3px solid var(--red);
}

.page-about .ab-assure__name {
  margin: 0 0 6px;
  font-size: 17px;
  line-height: 1.4;
  color: var(--cream);
}

.page-about .ab-assure__desc {
  max-width: 64ch;
  margin: 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: rgba(242, 239, 230, 0.74);
}

.page-about .ab-coop {
  list-style: none;
  display: grid;
  gap: 12px;
  margin: 28px 0 24px;
  padding: 0;
}

.page-about .ab-coop__item {
  padding: 20px 18px;
  border: 1px solid var(--grid);
  background: linear-gradient(158deg, rgba(196, 106, 69, 0.16), rgba(7, 12, 31, 0.72) 68%);
  transition: border-color 0.22s var(--ease);
}

.page-about .ab-coop__item:hover {
  border-color: var(--clay);
}

.page-about .ab-coop__name {
  margin: 0 0 8px;
  font-size: 17px;
  line-height: 1.4;
  color: var(--cream);
}

.page-about .ab-coop__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: rgba(242, 239, 230, 0.74);
}

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

.page-about .ab-award {
  position: relative;
  margin: 0 0 24px;
  padding: 24px 20px 24px 24px;
  border: 1px solid var(--grid);
  background: linear-gradient(120deg, rgba(240, 194, 78, 0.12), rgba(11, 18, 48, 0.6) 62%);
}

.page-about .ab-award::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--amber);
}

.page-about .ab-award__label {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--amber);
}

.page-about .ab-award__text {
  max-width: 66ch;
  margin: 0;
  font-size: 15.5px;
  line-height: 1.82;
  color: rgba(242, 239, 230, 0.82);
}

/* ---------- 延伸入口 ---------- */

.page-about .ab-next {
  padding: clamp(38px, 6vw, 72px) 0 clamp(26px, 4vw, 44px);
  border-top: 1px solid var(--ab-line);
}

.page-about .ab-next__title {
  margin: 0 0 22px;
  font-size: clamp(20px, 2.8vw, 26px);
  line-height: 1.35;
  color: var(--cream);
}

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

.page-about .ab-next__card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 20px 44px 20px 20px;
  border: 1px solid var(--grid);
  background: rgba(7, 12, 31, 0.66);
  color: var(--cream);
  text-decoration: none;
  overflow: hidden;
  transition: border-color 0.24s var(--ease), background-color 0.24s var(--ease);
}

.page-about .ab-next__card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--cyan);
  transform: translateX(-100%);
  transition: transform 0.28s var(--ease);
}

.page-about .ab-next__card:hover,
.page-about .ab-next__card:focus-visible {
  border-color: var(--cyan);
  background: rgba(44, 229, 216, 0.07);
}

.page-about .ab-next__card:hover::before,
.page-about .ab-next__card:focus-visible::before {
  transform: translateX(0);
}

.page-about .ab-next__k {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .ab-next__d {
  font-size: 15px;
  line-height: 1.7;
  color: rgba(242, 239, 230, 0.74);
}

.page-about .ab-next__a {
  position: absolute;
  right: 18px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 18px;
  color: var(--stone);
  transition: color 0.24s var(--ease), transform 0.24s var(--ease);
}

.page-about .ab-next__card:hover .ab-next__a,
.page-about .ab-next__card:focus-visible .ab-next__a {
  color: var(--cyan);
  transform: translateY(-50%) translateX(4px);
}

@media (min-width: 720px) {
  .page-about .ab-next__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1060px) {
  .page-about .ab-next__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 动效降级 ---------- */

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-channels li,
  .page-about .ab-coop__item,
  .page-about .ab-next__card,
  .page-about .ab-next__a,
  .page-about .ab-tl::before {
    transition: none;
  }
}
<<<END>>>