.page-about {
  --ab-year: clamp(64px, 9vw, 132px);
  --ab-edge: clamp(28px, 5vw, 72px);
  --ab-gap: clamp(20px, 4vw, 56px);
  background: var(--ink);
  color: var(--paper);
  overflow-x: clip;
  padding-bottom: clamp(40px, 6vw, 80px);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  padding: clamp(24px, 4vw, 52px) 0 clamp(28px, 4vw, 56px);
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  top: 14%;
  right: -18%;
  width: 56%;
  height: 72%;
  background: radial-gradient(closest-side, rgba(15, 122, 70, 0.3), transparent 72%);
  pointer-events: none;
  z-index: 0;
}

.page-about .ab-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 56px);
  align-items: center;
}

.page-about .ab-hero__lead h1 {
  margin: 14px 0 0;
  font-size: clamp(30px, 5.2vw, 58px);
  font-weight: 900;
  line-height: 1.18;
  letter-spacing: -0.022em;
  color: var(--paper);
}

.page-about .ab-hero__lead .lede {
  margin: 20px 0 0;
  max-width: 54ch;
  font-size: clamp(16px, 1.5vw, 18px);
  line-height: 1.82;
  color: rgba(246, 245, 239, 0.82);
}

.page-about .ab-hero__sub {
  margin: 22px 0 0;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--flare);
}

.page-about .ab-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .ab-hero__media {
  position: relative;
  margin: 0;
}

.page-about .ab-hero__media::before {
  content: "";
  position: absolute;
  top: -10px;
  left: 16px;
  width: 88px;
  height: 4px;
  border-radius: 4px;
  background: linear-gradient(90deg, var(--turf), var(--flare));
}

.page-about .ab-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 26px 26px 26px 92px;
  object-fit: cover;
}

.page-about .ab-hero__media figcaption {
  margin-top: 12px;
  font-size: 12px;
  letter-spacing: 0.02em;
  color: var(--rail);
}

/* ---------- 章节索引条 ---------- */
.page-about .ab-jump {
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
  background: linear-gradient(180deg, rgba(20, 41, 75, 0.6), rgba(10, 23, 48, 0));
}

.page-about .ab-jump__list {
  display: flex;
  gap: clamp(6px, 1.2vw, 16px);
  margin: 0;
  padding: 12px 0;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

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

.page-about .ab-jump__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  white-space: nowrap;
  padding: 6px 13px;
  border: 1px solid transparent;
  border-radius: 999px;
  font-size: 14px;
  color: rgba(246, 245, 239, 0.72);
  text-decoration: none;
  transition: color 0.24s ease, border-color 0.24s ease, background-color 0.24s ease;
}

.page-about .ab-jump__link .mono {
  font-size: 12px;
  color: var(--flare);
}

.page-about .ab-jump__link:hover,
.page-about .ab-jump__link:focus-visible {
  color: var(--paper);
  border-color: var(--line);
  background-color: rgba(20, 41, 75, 0.66);
}

.page-about .ab-jump__link.is-active {
  color: var(--flare);
  border-color: rgba(216, 250, 75, 0.42);
  background-color: rgba(216, 250, 75, 0.08);
}

/* ---------- 通用章节 ---------- */
.page-about .ab-sec {
  position: relative;
  padding: clamp(56px, 8vw, 108px) 0;
}

.page-about .ab-sec__head {
  display: flex;
  align-items: baseline;
  gap: clamp(12px, 2vw, 22px);
  margin-bottom: clamp(16px, 2.5vw, 28px);
}

.page-about .ab-sec__idx {
  margin: 0;
  font-size: clamp(13px, 1.2vw, 15px);
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--flare);
}

.page-about .section-title {
  margin: 0;
  font-size: clamp(27px, 4.2vw, 50px);
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: -0.022em;
  color: var(--paper);
}

.page-about .ab-sec__lede {
  max-width: 64ch;
  margin: 0 0 clamp(26px, 4vw, 44px);
  color: rgba(246, 245, 239, 0.78);
}

/* ---------- 三块能力 ---------- */
.page-about .ab-caps {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 44px);
}

.page-about .ab-cap {
  position: relative;
  padding-top: clamp(18px, 2.4vw, 28px);
  border-top: 1px solid var(--line);
}

.page-about .ab-cap__num {
  display: block;
  margin: 0;
  font-size: clamp(44px, 6.4vw, 82px);
  font-weight: 800;
  line-height: 0.95;
  letter-spacing: -0.035em;
}

.page-about .ab-cap--flare .ab-cap__num {
  color: var(--flare);
}

.page-about .ab-cap--concede .ab-cap__num {
  color: var(--concede);
}

.page-about .ab-cap--goal .ab-cap__num {
  color: var(--goal);
}

.page-about .ab-cap h3 {
  margin: 14px 0 0;
  font-size: clamp(19px, 2.1vw, 25px);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .ab-cap p {
  margin: 12px 0 0;
  font-size: 15.5px;
  line-height: 1.82;
  color: rgba(246, 245, 239, 0.76);
}

/* ---------- 时间轴 ---------- */
.page-about .ab-sec--road::before {
  content: "";
  position: absolute;
  inset: auto 0 0 auto;
  width: 38%;
  height: 58%;
  background: radial-gradient(closest-side, rgba(31, 168, 95, 0.18), transparent 74%);
  pointer-events: none;
}

.page-about .ab-time {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-time__item {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  padding-bottom: clamp(30px, 5vw, 58px);
}

.page-about .ab-time__year {
  margin: 0;
  font-size: clamp(24px, 3.4vw, 44px);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--flare);
}

.page-about .ab-time__body {
  position: relative;
  outline: none;
}

.page-about .ab-time__body h3 {
  margin: 0;
  font-size: clamp(18px, 2.2vw, 24px);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .ab-time__body > p {
  margin: 12px 0 0;
  max-width: 62ch;
  font-size: 15.5px;
  line-height: 1.82;
  color: rgba(246, 245, 239, 0.74);
}

.page-about .ab-time__body:focus-visible h3 {
  color: var(--flare);
}

.page-about .ab-time__more {
  max-height: 0;
  margin-top: 0;
  padding-left: 14px;
  border-left: 2px solid rgba(216, 250, 75, 0.45);
  opacity: 0;
  overflow: hidden;
  transition: max-height 0.38s ease, opacity 0.3s ease, margin-top 0.38s ease;
}

.page-about .ab-time__more p {
  margin: 8px 0 0;
  font-size: 14px;
  color: var(--concede);
}

.page-about .ab-time__figure {
  margin: 0 0 clamp(30px, 5vw, 58px);
}

.page-about .ab-time__figure figure {
  margin: 0;
}

.page-about .ab-time__figure img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 10px 44px 10px 44px;
  object-fit: cover;
}

.page-about .ab-time__figure figcaption {
  margin-top: 12px;
  font-size: 12px;
  letter-spacing: 0.02em;
  color: var(--rail);
}

/* ---------- 流程四步 ---------- */
.page-about .ab-pipe {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 3.4vw, 34px);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-pipe__step {
  position: relative;
  padding-left: clamp(34px, 6vw, 46px);
}

.page-about .ab-pipe__step::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: calc(-1 * clamp(24px, 3.4vw, 34px));
  width: 1px;
  background: var(--line);
}

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

.page-about .ab-pipe__step::after {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--goal);
}

.page-about .ab-pipe__idx {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--rail);
}

.page-about .ab-pipe__step h3 {
  margin: 8px 0 0;
  font-size: clamp(17px, 2vw, 22px);
  font-weight: 700;
  color: var(--paper);
}

.page-about .ab-pipe__step p {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(246, 245, 239, 0.74);
}

/* ---------- 团队 ---------- */
.page-about .ab-team {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 3.6vw, 34px);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-team__node {
  position: relative;
  padding-left: clamp(30px, 7vw, 44px);
}

.page-about .ab-team__node::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 6px;
  bottom: calc(-1 * clamp(24px, 3.6vw, 34px));
  width: 1px;
  background: var(--line);
}

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

.page-about .ab-team__node::after {
  content: "";
  position: absolute;
  left: 0;
  top: 3px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--turf-hi);
}

.page-about .ab-team__id {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--flare);
}

.page-about .ab-team__node h3 {
  margin: 9px 0 0;
  font-size: clamp(17px, 2vw, 21px);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .ab-team__node p {
  margin: 10px 0 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: rgba(246, 245, 239, 0.72);
}

.page-about .ab-team__figure {
  margin: clamp(34px, 5vw, 60px) 0 0;
}

.page-about .ab-team__figure img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 40px 10px 40px 10px;
  object-fit: cover;
}

/* ---------- 纸面分区 ---------- */
.page-about .ab-paper {
  width: min(1400px, calc(100% - 2 * var(--gutter)));
  margin: clamp(20px, 4vw, 44px) auto;
  padding: clamp(40px, 6vw, 84px) clamp(20px, 4vw, 64px);
  background: var(--paper);
  color: var(--deep);
  border-radius: clamp(26px, 5vw, 68px);
}

.page-about .ab-paper .eyebrow {
  margin: 0;
  color: var(--turf);
}

.page-about .ab-paper h2 {
  margin: 12px 0 0;
  font-size: clamp(26px, 4vw, 46px);
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: -0.022em;
  color: var(--deep);
}

.page-about .ab-facts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: clamp(20px, 3vw, 36px);
  margin: clamp(28px, 4vw, 48px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-facts__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(30px, 4.4vw, 54px);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.04em;
  color: var(--deep);
}

.page-about .ab-facts__num em {
  font-style: normal;
  font-size: 0.42em;
  font-weight: 700;
  letter-spacing: 0;
  margin-left: 2px;
  color: var(--turf);
}

.page-about .ab-facts__label {
  display: block;
  margin-top: 12px;
  font-size: 14px;
  line-height: 1.72;
  color: rgba(8, 18, 31, 0.64);
}

.page-about .ab-paper__note {
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding-top: clamp(18px, 2.4vw, 26px);
  border-top: 1px solid rgba(8, 18, 31, 0.14);
  max-width: 72ch;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(8, 18, 31, 0.7);
}

/* ---------- 合作技能树 ---------- */
.page-about .ab-sec--partner {
  padding-bottom: clamp(72px, 9vw, 140px);
}

.page-about .ab-tree {
  position: relative;
  display: grid;
  gap: clamp(20px, 3vw, 32px);
  margin: 0;
  padding: 0 0 0 var(--ab-gap);
  list-style: none;
}

.page-about .ab-tree::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--turf-hi), var(--flare) 72%, transparent);
}

.page-about .ab-tree__item {
  position: relative;
  outline: none;
}

.page-about .ab-tree__item::before {
  content: "";
  position: absolute;
  left: calc(-1 * var(--ab-gap) + 6px);
  top: 15px;
  width: calc(var(--ab-gap) - 6px);
  height: 1px;
  background: var(--line);
}

.page-about .ab-tree__item::after {
  content: "";
  position: absolute;
  left: calc(-1 * var(--ab-gap) + 1px);
  top: 10px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--flare);
}

.page-about .ab-tree__head {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .ab-tree__idx {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--flare);
}

.page-about .ab-tree__item h3 {
  margin: 0;
  font-size: clamp(18px, 2.1vw, 23px);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .ab-tree__item > p {
  margin: 10px 0 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(246, 245, 239, 0.74);
}

.page-about .ab-tree__item:focus-visible h3 {
  color: var(--flare);
}

.page-about .ab-tree__form {
  max-height: 0;
  margin-top: 0;
  font-size: 12.5px;
  letter-spacing: 0.02em;
  color: var(--concede);
  opacity: 0;
  overflow: hidden;
  transition: max-height 0.34s ease, opacity 0.28s ease, margin-top 0.34s ease;
}

.page-about .ab-cta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: clamp(16px, 2.4vw, 28px);
  margin-top: clamp(36px, 5vw, 64px);
  padding-top: clamp(24px, 3vw, 36px);
  border-top: 1px solid var(--line);
}

.page-about .ab-cta p {
  margin: 0;
  flex: 1 1 320px;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(246, 245, 239, 0.76);
}

/* ---------- 交互：悬停 / 键盘聚焦展开 ---------- */
@media (min-width: 900px) {
  .page-about .ab-time__body:hover .ab-time__more,
  .page-about .ab-time__body:focus-within .ab-time__more {
    max-height: 150px;
    margin-top: 14px;
    opacity: 1;
  }

  .page-about .ab-tree__item:hover .ab-tree__form,
  .page-about .ab-tree__item:focus-within .ab-tree__form {
    max-height: 90px;
    margin-top: 12px;
    opacity: 1;
  }
}

@media (max-width: 899px) {
  .page-about .ab-time__more,
  .page-about .ab-tree__form {
    max-height: none;
    margin-top: 12px;
    opacity: 1;
  }
}

/* ---------- 桌面栅格 ---------- */
@media (min-width: 820px) {
  .page-about .ab-caps {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    align-items: start;
    gap: clamp(24px, 3vw, 40px);
  }

  .page-about .ab-cap:nth-child(1) {
    grid-column: 1 / span 7;
  }

  .page-about .ab-cap:nth-child(2) {
    grid-column: 8 / span 5;
    margin-top: clamp(36px, 5vw, 78px);
  }

  .page-about .ab-cap:nth-child(3) {
    grid-column: 3 / span 8;
    margin-top: clamp(14px, 2vw, 26px);
  }
}

@media (min-width: 900px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    gap: clamp(32px, 4.5vw, 76px);
  }

  .page-about .ab-time {
    margin-left: clamp(40px, 12vw, 200px);
  }

  .page-about .ab-time__item {
    grid-template-columns: var(--ab-year) minmax(0, 1fr);
    gap: clamp(24px, 3.5vw, 56px);
  }

  .page-about .ab-time__year {
    text-align: right;
  }

  .page-about .ab-time__item::before {
    content: "";
    position: absolute;
    left: calc(var(--ab-year) + clamp(12px, 1.75vw, 28px));
    top: 12px;
    bottom: 0;
    width: 1px;
    background: var(--line);
  }

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

  .page-about .ab-time__item::after {
    content: "";
    position: absolute;
    left: calc(var(--ab-year) + clamp(12px, 1.75vw, 28px));
    top: 8px;
    width: 11px;
    height: 11px;
    margin-left: -5px;
    border-radius: 50%;
    background: var(--turf-hi);
    box-shadow: 0 0 0 4px rgba(31, 168, 95, 0.16);
  }

  .page-about .ab-team__figure {
    width: min(100%, 760px);
    margin-left: auto;
  }
}

@media (min-width: 1000px) {
  .page-about .ab-pipe {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0;
  }

  .page-about .ab-pipe__step {
    padding: 46px clamp(14px, 1.8vw, 28px) 0 0;
  }

  .page-about .ab-pipe__step::before {
    top: 14px;
    left: 0;
    right: 0;
    bottom: auto;
    height: 1px;
    width: auto;
  }

  .page-about .ab-pipe__step:last-child::before {
    display: block;
    right: 55%;
  }

  .page-about .ab-pipe__step::after {
    top: 9px;
    left: 0;
  }
}

@media (min-width: 860px) {
  .page-about .ab-team {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0;
  }

  .page-about .ab-team__node {
    padding: 32px clamp(16px, 2vw, 28px) 0 0;
  }

  .page-about .ab-team__node::before {
    top: 6px;
    left: 0;
    right: 0;
    bottom: auto;
    width: auto;
    height: 1px;
    background: linear-gradient(90deg, var(--turf-hi), rgba(216, 250, 75, 0.55));
  }

  .page-about .ab-team__node:nth-child(4)::before {
    display: none;
  }

  .page-about .ab-team__node::after {
    top: 0;
    left: 0;
  }
}

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

@media (min-width: 1080px) {
  .page-about .ab-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}
<<<END>>>