.page-about {
  --ab-line-soft: rgba(134, 167, 157, 0.18);
  --ab-gap: clamp(20px, 4vw, 44px);
}

.page-about .ab-crumbs-wrap {
  padding-top: clamp(16px, 3vw, 28px);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  padding-block: clamp(20px, 4vw, 40px) clamp(28px, 5vw, 64px);
}

.page-about .ab-hero__inner {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
  align-items: start;
}

.page-about .ab-hero__text h1 {
  margin: 14px 0 0;
  font-size: clamp(30px, 7.2vw, 58px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .ab-hero__lede {
  margin: 20px 0 0;
  max-width: 48ch;
  font-size: clamp(15px, 2.4vw, 17px);
  line-height: 1.8;
  color: var(--paper);
  opacity: 0.88;
}

.page-about .ab-hero__figure {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--moss);
  overflow: hidden;
}

.page-about .ab-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  max-height: 420px;
  object-fit: cover;
}

.page-about .ab-hero__figure figcaption {
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--sage);
  padding: 10px 12px;
  border-top: 1px solid var(--line-soft);
}

@media (min-width: 900px) {
  .page-about .ab-hero__inner {
    grid-template-columns: minmax(0, 1fr) 300px;
    align-items: stretch;
  }

  .page-about .ab-hero__figure {
    align-self: stretch;
  }

  .page-about .ab-hero__figure img {
    height: 100%;
    max-height: 540px;
  }
}

/* ---------- 通用区块 ---------- */
.page-about .ab-section {
  padding-block: clamp(36px, 6vw, 76px);
  border-top: 1px solid var(--line-soft);
}

.page-about .ab-section--band {
  background: linear-gradient(180deg, rgba(23, 69, 59, 0.62), rgba(11, 43, 36, 0) 72%);
}

.page-about .ab-section--lang {
  background: linear-gradient(120deg, rgba(23, 69, 59, 0.5), rgba(11, 43, 36, 0.05) 65%);
}

.page-about .ab-section--team {
  background: linear-gradient(180deg, rgba(18, 21, 22, 0.55), rgba(11, 43, 36, 0) 60%);
}

.page-about .ab-h2 {
  margin: 12px 0 0;
  font-size: clamp(23px, 4.4vw, 36px);
  line-height: 1.18;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .ab-lead {
  margin: 18px 0 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--paper);
  opacity: 0.84;
}

/* ---------- 规模数据带 ---------- */
.page-about .ab-band {
  list-style: none;
  margin: clamp(24px, 4vw, 40px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px 14px;
}

.page-about .ab-band__item {
  padding: 4px 0 4px 14px;
  border-left: 2px solid var(--cyan);
}

.page-about .ab-band__num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(24px, 4.6vw, 34px);
  line-height: 1.1;
  color: var(--cyan);
}

.page-about .ab-band__label {
  display: block;
  margin-top: 8px;
  font-size: 12.5px;
  line-height: 1.6;
  letter-spacing: 0.04em;
  color: var(--sage);
}

@media (min-width: 760px) {
  .page-about .ab-band {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 12px 20px;
  }
}

/* ---------- 六个分档 ---------- */
.page-about .ab-cats__head {
  display: grid;
  gap: 16px;
}

.page-about .ab-aside {
  margin: 0;
  padding-left: 12px;
  border-left: 2px solid var(--orange);
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--sage);
}

@media (min-width: 820px) {
  .page-about .ab-cats__head {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    align-items: end;
  }
}

.page-about .ab-cats {
  margin-top: clamp(22px, 4vw, 36px);
  display: grid;
  gap: 16px;
}

.page-about .ab-cat {
  padding: 20px 18px 18px;
  background: rgba(23, 69, 59, 0.42);
  border: 1px solid var(--line);
  transition: transform var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease),
    background-color var(--t-fast) var(--ease);
}

.page-about .ab-cat:hover {
  transform: translateY(-2px);
  border-color: var(--cyan);
  background: rgba(23, 69, 59, 0.6);
}

.page-about .ab-cat__num {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--orange);
}

.page-about .ab-cat h3 {
  margin: 10px 0 0;
  font-size: 19px;
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .ab-cat p {
  margin: 10px 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--paper);
  opacity: 0.82;
}

.page-about .ab-cat__more {
  margin-top: 14px;
  padding-top: 10px;
  border-top: 1px dashed var(--line);
}

.page-about .ab-cat__more summary {
  cursor: pointer;
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--cyan);
  list-style: none;
}

.page-about .ab-cat__more summary::-webkit-details-marker {
  display: none;
}

.page-about .ab-cat__more summary::before {
  content: "+";
  margin-right: 8px;
  font-family: var(--font-mono);
  color: var(--orange);
}

.page-about .ab-cat__more[open] summary::before {
  content: "−";
}

.page-about .ab-cat__more p {
  margin: 10px 0 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--sage);
  opacity: 1;
}

@media (min-width: 760px) {
  .page-about .ab-cats {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: 18px;
  }

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

  .page-about .ab-cat:nth-child(2) {
    grid-column: span 5;
    margin-top: 18px;
  }

  .page-about .ab-cat:nth-child(3) {
    grid-column: span 5;
  }

  .page-about .ab-cat:nth-child(4) {
    grid-column: span 7;
    margin-top: -18px;
  }

  .page-about .ab-cat:nth-child(5) {
    grid-column: span 7;
  }

  .page-about .ab-cat:nth-child(6) {
    grid-column: span 5;
    margin-top: 18px;
  }
}

/* ---------- 语言覆盖 ---------- */
.page-about .ab-lang {
  display: grid;
  gap: var(--ab-gap);
}

@media (min-width: 880px) {
  .page-about .ab-lang {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    align-items: start;
  }
}

.page-about .ab-lang__panel {
  padding: 22px 20px;
  background: rgba(18, 21, 22, 0.52);
  border: 1px solid var(--line);
}

.page-about .ab-lang__bar {
  display: flex;
  height: 46px;
  border: 1px solid var(--line);
  overflow: hidden;
}

.page-about .ab-lang__seg {
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 13px;
  font-variant-numeric: tabular-nums;
  transition: filter var(--t-fast) var(--ease);
}

.page-about .ab-lang__seg:hover {
  filter: brightness(1.12);
}

.page-about .ab-lang__seg--zh {
  flex: 82 1 0;
  background: linear-gradient(90deg, #2E7F6B, var(--cyan));
  color: var(--ink-deep);
}

.page-about .ab-lang__seg--other {
  flex: 18 1 0;
  background: var(--manila);
  color: var(--carbon);
}

.page-about .ab-lang__legend {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--paper);
  opacity: 0.86;
}

.page-about .ab-lang__legend li {
  display: flex;
  align-items: center;
  gap: 10px;
}

.page-about .ab-lang__swatch {
  width: 14px;
  height: 14px;
  flex: 0 0 auto;
  border: 1px solid var(--line);
}

.page-about .ab-lang__swatch--zh {
  background: linear-gradient(90deg, #2E7F6B, var(--cyan));
}

.page-about .ab-lang__swatch--other {
  background: var(--manila);
}

/* ---------- 维护节奏 ---------- */
.page-about .ab-flow {
  margin-top: clamp(22px, 4vw, 36px);
  display: grid;
  gap: 14px;
}

.page-about .ab-flow__step {
  padding: 18px;
  background: rgba(18, 21, 22, 0.38);
  border: 1px solid var(--line-soft);
  border-top: 2px solid var(--cyan);
}

.page-about .ab-flow__idx {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--orange);
}

.page-about .ab-flow__step h3 {
  margin: 8px 0 0;
  font-size: 17px;
  color: var(--paper);
}

.page-about .ab-flow__step p {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--paper);
  opacity: 0.82;
}

@media (min-width: 780px) {
  .page-about .ab-flow {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .ab-flow__step:nth-child(2) {
    margin-top: 20px;
  }
}

/* ---------- 时间线 ---------- */
.page-about .ab-tl-block {
  margin-top: clamp(22px, 4vw, 36px);
  display: grid;
  gap: clamp(22px, 4vw, 36px);
}

@media (min-width: 900px) {
  .page-about .ab-tl-block {
    grid-template-columns: 280px minmax(0, 1fr);
    align-items: start;
  }
}

.page-about .ab-tl-figure {
  margin: 0;
  border: 1px solid var(--line);
  overflow: hidden;
}

.page-about .ab-tl-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 10 / 7;
  object-fit: cover;
}

.page-about .ab-tl-figure figcaption {
  padding: 10px 12px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--sage);
  border-top: 1px solid var(--line-soft);
  background: rgba(18, 21, 22, 0.4);
}

.page-about .ab-tl {
  list-style: none;
  margin: 0;
  padding: 0 0 12px;
  display: flex;
  gap: 0;
  overflow-x: auto;
  border-top: 1px solid var(--manila);
  scroll-snap-type: x proximity;
}

.page-about .ab-tl__item {
  position: relative;
  flex: 0 0 auto;
  width: 210px;
  padding: 22px 18px 16px 0;
  scroll-snap-align: start;
}

.page-about .ab-tl__item::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 1px;
  height: 14px;
  background: var(--manila);
}

.page-about .ab-tl__year {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 15px;
  letter-spacing: 0.1em;
  color: var(--manila);
}

.page-about .ab-tl__text {
  margin: 10px 0 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--paper);
  opacity: 0.8;
}

.page-about .ab-tl__item--now {
  background: linear-gradient(180deg, var(--cyan-soft), rgba(70, 224, 200, 0));
}

.page-about .ab-tl__item--now::before {
  width: 3px;
  background: var(--cyan);
}

.page-about .ab-tl__item--now .ab-tl__year {
  font-size: 22px;
  color: var(--cyan);
}

.page-about .ab-tl__item--now .ab-tl__text {
  opacity: 0.92;
}

/* ---------- 团队与联络 ---------- */
.page-about .ab-team-figure {
  margin: 0 0 clamp(22px, 4vw, 40px);
  border: 1px solid var(--line);
  overflow: hidden;
}

.page-about .ab-team-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-height: 340px;
  object-fit: cover;
}

.page-about .ab-team-figure figcaption {
  padding: 10px 14px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--sage);
  border-top: 1px solid var(--line-soft);
  background: rgba(18, 21, 22, 0.4);
}

.page-about .ab-team-block {
  display: grid;
  gap: var(--ab-gap);
}

@media (min-width: 900px) {
  .page-about .ab-team-block {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    align-items: start;
  }
}

.page-about .ab-roles {
  margin-top: clamp(20px, 3vw, 28px);
  display: grid;
  gap: 12px;
}

@media (min-width: 620px) {
  .page-about .ab-roles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .ab-role:nth-child(2) {
    margin-top: 14px;
  }
}

.page-about .ab-role {
  padding: 16px 14px;
  background: rgba(227, 214, 176, 0.07);
  border: 1px solid var(--ab-line-soft);
}

.page-about .ab-role h3 {
  margin: 0;
  font-size: 15px;
  letter-spacing: 0.04em;
  color: var(--cyan);
}

.page-about .ab-role p {
  margin: 8px 0 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--paper);
  opacity: 0.82;
}

.page-about .ab-contact {
  margin-top: 4px;
  padding: 20px 18px;
  background: rgba(18, 21, 22, 0.55);
  border: 1px solid var(--line);
  display: grid;
  gap: 12px;
}

.page-about .ab-contact__row {
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 4px 14px;
  font-size: 14px;
  line-height: 1.65;
}

.page-about .ab-contact__key {
  flex: 0 0 68px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--sage);
  padding-top: 2px;
}

.page-about .ab-contact__val {
  color: var(--paper);
  overflow-wrap: anywhere;
}

.page-about .ab-contact__val--mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  color: var(--cyan);
}

.page-about .ab-links {
  margin-top: 20px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 20px;
}

.page-about .ab-link {
  font-size: 14px;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--t-fast) var(--ease);
}

.page-about .ab-link:hover,
.page-about .ab-link:focus-visible {
  border-bottom-color: var(--cyan);
}

.page-about .ab-link:focus-visible,
.page-about .ab-cat__more summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-cat,
  .page-about .ab-lang__seg,
  .page-about .ab-link {
    transition: none;
  }

  .page-about .ab-cat:hover {
    transform: none;
  }
}
<<<END>>>