.page-about {
  --ab-line: rgba(233, 241, 236, 0.14);
  --ab-line-soft: rgba(233, 241, 236, 0.08);
  --ab-line-strong: rgba(233, 241, 236, 0.30);
  --ab-hover: rgba(200, 255, 61, 0.07);
  padding-bottom: clamp(48px, 10vw, 120px);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  padding-top: clamp(20px, 5vw, 48px);
}

.page-about .ab-hero__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.3rem, 8.4vw, 6rem);
  line-height: 0.94;
  letter-spacing: -0.02em;
  color: var(--c-mist);
  margin: 0.22em 0 0.42em;
  max-width: 18ch;
}

.page-about .ab-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 4vw, 40px);
  align-items: start;
  border-top: var(--line);
  padding-top: clamp(18px, 3vw, 28px);
}

.page-about .ab-hero__lede {
  max-width: 56ch;
  color: var(--c-mist);
  font-size: clamp(0.95rem, 1.4vw, 1.05rem);
  line-height: 1.8;
  margin: 0;
}

.page-about .ab-facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background-color: var(--ab-line);
  border: var(--line);
}

.page-about .ab-facts li {
  background-color: var(--c-ink);
  padding: 12px 14px;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
}

.page-about .ab-facts__k {
  font-size: 0.76rem;
  letter-spacing: 0.08em;
  color: var(--c-gray);
}

.page-about .ab-facts__v {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  color: var(--c-lime);
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.page-about .ab-hero__media {
  margin-top: clamp(26px, 5vw, 52px);
  margin-bottom: 0;
}

/* ---------- 主体骨架 ---------- */
.page-about .ab-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 5vw, 56px);
  margin-top: clamp(44px, 8vw, 96px);
}

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

.page-about .ab-index__label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  color: var(--c-gray);
  margin: 0 0 16px;
}

.page-about .ab-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .ab-index__list a {
  display: block;
  color: var(--c-steel);
  text-decoration: none;
  font-size: 0.82rem;
  line-height: 1.5;
  padding-bottom: 4px;
  border-bottom: 1px solid transparent;
  transition: color 180ms var(--ease), border-color 180ms var(--ease);
}

.page-about .ab-index__list a:hover,
.page-about .ab-index__list a:focus-visible {
  color: var(--c-lime);
  border-bottom-color: var(--c-lime);
}

.page-about .ab-index__no {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--c-amber);
  letter-spacing: 0.1em;
  display: block;
  margin-bottom: 2px;
}

/* ---------- 章节 ---------- */
.page-about .ab-flow {
  min-width: 0;
}

.page-about .ab-block {
  padding-top: clamp(34px, 6vw, 68px);
  border-top: var(--line);
}

.page-about .ab-flow > .ab-block:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .ab-block__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 16px;
  margin-bottom: clamp(14px, 2vw, 22px);
}

.page-about .ab-block__head .eyebrow {
  margin: 0;
  flex: 0 0 auto;
}

.page-about .ab-block__head .section-title {
  margin: 0;
}

.page-about .ab-prose {
  max-width: 64ch;
  color: var(--c-mist);
  font-size: 0.98rem;
  line-height: 1.8;
  margin: 0;
}

/* ---------- 团队分组 ---------- */
.page-about .ab-roles {
  list-style: none;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  border-top: var(--line);
}

.page-about .ab-role {
  border-bottom: var(--line);
  padding: 20px 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  align-items: baseline;
  transition: background-color 200ms var(--ease), padding-left 200ms var(--ease);
}

.page-about .ab-role:hover {
  background-image: linear-gradient(90deg, var(--ab-hover), rgba(200, 255, 61, 0) 72%);
  padding-left: 12px;
}

.page-about .ab-role__no {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.16em;
  color: var(--c-amber);
}

.page-about .ab-role__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: 0.02em;
  color: var(--c-mist);
  margin: 0;
}

.page-about .ab-role__duty {
  margin: 0;
  color: var(--c-steel);
  font-size: 0.9rem;
  line-height: 1.78;
}

/* ---------- 原则铭牌 ---------- */
.page-about .ab-principles {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background-color: var(--ab-line);
  border: var(--line);
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .ab-principle {
  background-color: var(--c-ink);
  padding: clamp(18px, 3vw, 28px);
  border-left: 0 solid transparent;
  transition: border-color 200ms var(--ease), background-color 200ms var(--ease);
}

.page-about .ab-principle:hover {
  background-color: #081F19;
  border-left: 3px solid var(--c-lime);
}

.page-about .ab-principle__no {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--c-lime);
  margin-bottom: 10px;
}

.page-about .ab-principle__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.02rem;
  letter-spacing: 0.02em;
  color: var(--c-mist);
  margin: 0 0 8px;
}

.page-about .ab-principle__body {
  margin: 0;
  color: var(--c-steel);
  font-size: 0.88rem;
  line-height: 1.78;
}

/* ---------- 图片 ---------- */
.page-about .ab-figure {
  margin: clamp(20px, 4vw, 36px) 0 0;
}

/* ---------- 筛选与时间线 ---------- */
.page-about .ab-tools {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 20px;
  margin-top: clamp(18px, 3vw, 26px);
  padding-bottom: 14px;
  border-bottom: var(--line);
}

.page-about .ab-tools__count {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  color: var(--c-gray);
  white-space: nowrap;
}

.page-about .ab-tools__count span {
  color: var(--c-amber);
}

.page-about .ab-timeline {
  list-style: none;
  margin: clamp(22px, 4vw, 34px) 0 0;
  padding: 0 0 0 28px;
  position: relative;
  display: grid;
  gap: clamp(20px, 3vw, 30px);
}

.page-about .ab-timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background-image: linear-gradient(180deg, var(--c-lime) 0%, var(--c-amber) 55%, var(--c-steel) 100%);
  opacity: 0.5;
}

.page-about .ab-node {
  position: relative;
  min-width: 0;
}

.page-about .ab-node::before {
  content: "";
  position: absolute;
  left: -27px;
  top: 5px;
  width: 13px;
  height: 13px;
  border: 1px solid var(--c-lime);
  background-color: var(--c-ink);
  transform: rotate(45deg);
}

.page-about .ab-node__ver {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.16em;
  color: var(--c-amber);
}

.page-about .ab-node__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.08rem;
  letter-spacing: 0.02em;
  color: var(--c-mist);
  margin: 0 0 8px;
}

.page-about .ab-node__desc {
  margin: 0;
  max-width: 62ch;
  color: var(--c-steel);
  font-size: 0.9rem;
  line-height: 1.78;
}

/* ---------- 筛选边界四轴 ---------- */
.page-about .ab-axes {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background-color: var(--ab-line);
  border: var(--line);
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .ab-axis {
  background-color: var(--c-deep);
  padding: clamp(16px, 2.4vw, 22px) clamp(14px, 2vw, 20px);
}

.page-about .ab-axis__k {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  color: var(--c-lime);
  border-bottom: 1px solid var(--ab-line-strong);
  padding-bottom: 4px;
  margin-bottom: 10px;
}

.page-about .ab-axis__v {
  margin: 0;
  color: var(--c-mist);
  font-size: 0.86rem;
  line-height: 1.76;
}

/* ---------- 更新节奏 ---------- */
.page-about .ab-cadence {
  list-style: none;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  border-top: var(--line);
}

.page-about .ab-cadence li {
  border-bottom: var(--line);
  padding: 15px 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  align-items: baseline;
}

.page-about .ab-cadence__k {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.06em;
  color: var(--c-amber);
}

.page-about .ab-cadence__v {
  color: var(--c-steel);
  font-size: 0.9rem;
  line-height: 1.75;
}

/* ---------- 后续链接 ---------- */
.page-about .ab-next {
  margin-top: clamp(44px, 8vw, 88px);
  border-top: var(--line-strong);
  padding-top: clamp(20px, 3vw, 30px);
}

.page-about .ab-next .eyebrow {
  margin: 0 0 16px;
}

.page-about .ab-next__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 布局断点 ---------- */
@media (min-width: 700px) {
  .page-about .ab-principles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .ab-axes {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .ab-role {
    grid-template-columns: 48px minmax(0, 0.85fr) minmax(0, 1.7fr) auto;
    gap: 20px;
    align-items: start;
  }

  .page-about .ab-role__no {
    padding-top: 4px;
  }

  .page-about .ab-cadence li {
    grid-template-columns: 168px minmax(0, 1fr);
    gap: 24px;
  }
}

@media (min-width: 860px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    gap: clamp(28px, 5vw, 56px);
  }
}

@media (min-width: 1000px) {
  .page-about .ab-shell {
    grid-template-columns: 188px minmax(0, 1fr);
    gap: clamp(40px, 6vw, 88px);
  }

  .page-about .ab-index {
    display: block;
    position: sticky;
    top: calc(var(--topbar-h) + 28px);
    align-self: start;
    border-left: var(--line);
    padding-left: 18px;
    max-height: calc(100vh - var(--topbar-h) - 56px);
    overflow: hidden;
  }

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

@media (min-width: 1240px) {
  .page-about .ab-hero__title {
    max-width: 22ch;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-role,
  .page-about .ab-principle,
  .page-about .ab-index__list a {
    transition: none;
  }
}
<<<END>>>