.page-about {
  --about-hair: rgba(244, 241, 231, 0.22);
  --about-paper-line: rgba(11, 47, 38, 0.12);
  position: relative;
}

.page-about img {
  display: block;
  max-width: 100%;
  height: auto;
}

.page-about figure {
  margin: 0;
}

.page-about figcaption {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.6;
  color: rgba(11, 47, 38, 0.62);
}

.page-about .about-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(26px, 6vw, 36px);
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1.05;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  background:
    radial-gradient(120% 90% at 88% 12%, rgba(29, 111, 140, 0.42) 0%, rgba(29, 111, 140, 0) 58%),
    radial-gradient(90% 70% at 6% 96%, rgba(31, 122, 77, 0.5) 0%, rgba(31, 122, 77, 0) 62%),
    var(--ink);
  color: var(--paper);
  padding: var(--sp-1) 0 0;
}

.page-about .about-hero__inner {
  padding-bottom: var(--sp-2);
}

.page-about .about-hero .breadcrumb {
  margin-bottom: var(--sp-1);
}

.page-about .about-hero .breadcrumb__link,
.page-about .about-hero .breadcrumb__sep,
.page-about .about-hero .breadcrumb__current {
  color: rgba(244, 241, 231, 0.72);
  font-size: 13px;
}

.page-about .about-hero .breadcrumb__current {
  color: var(--neon);
}

.page-about .about-hero__grid {
  display: grid;
  gap: var(--sp-2);
  align-items: start;
}

.page-about .about-hero .eyebrow {
  color: var(--neon);
  margin-bottom: 18px;
}

.page-about .about-hero .display-title {
  color: var(--paper);
  margin: 0 0 24px;
}

.page-about .about-hero .lede {
  color: rgba(244, 241, 231, 0.82);
  max-width: 44ch;
  margin: 0 0 32px;
  font-size: 17px;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.page-about .about-hero__figure {
  position: relative;
  border-radius: 140px var(--r-lg) var(--r-lg) var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--about-hair);
}

.page-about .about-hero__figure img {
  width: 100%;
  aspect-ratio: 14 / 9;
  object-fit: cover;
}

.page-about .about-hero__caption {
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  padding: 14px 18px;
  margin: 0;
  color: var(--paper);
  font-size: 12px;
  letter-spacing: 0.04em;
  background: linear-gradient(180deg, rgba(11, 47, 38, 0) 0%, rgba(11, 47, 38, 0.86) 100%);
}

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

.page-about .about-hero__facts li {
  background: var(--ink);
  padding: 22px 18px;
}

.page-about .about-hero__facts .about-num {
  color: var(--neon);
}

.page-about .about-fact__label {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.5;
  color: rgba(244, 241, 231, 0.72);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-chapter {
  padding: var(--sp-2) 0;
  position: relative;
}

.page-about .about-chapter--paper {
  background: var(--paper);
  color: var(--char);
}

.page-about .about-chapter--mist {
  background: var(--mist);
  color: var(--char);
}

.page-about .about-chapter--ink {
  background: var(--ink);
  color: var(--paper);
}

.page-about .about-chapter--lake {
  background:
    linear-gradient(160deg, rgba(29, 111, 140, 0.94) 0%, rgba(11, 47, 38, 0.96) 100%);
  color: var(--paper);
}

.page-about .about-chapter--indigo {
  background:
    radial-gradient(90% 80% at 92% 0%, rgba(117, 36, 63, 0.55) 0%, rgba(117, 36, 63, 0) 60%),
    var(--indigo);
  color: var(--paper);
}

.page-about .about-chapter .eyebrow {
  color: var(--pitch);
  margin-bottom: 14px;
}

.page-about .about-chapter--ink .eyebrow,
.page-about .about-chapter--lake .eyebrow,
.page-about .about-chapter--indigo .eyebrow {
  color: var(--neon);
}

.page-about .about-chapter .section-title {
  margin: 0 0 24px;
  max-width: 22ch;
}

.page-about .about-lede {
  font-size: 16px;
  line-height: 1.8;
  max-width: 58ch;
  margin: 0 0 var(--sp-1);
  color: rgba(11, 47, 38, 0.78);
}

.page-about .about-chapter--ink .about-lede,
.page-about .about-chapter--lake .about-lede,
.page-about .about-chapter--indigo .about-lede {
  color: rgba(244, 241, 231, 0.8);
}

.page-about .about-chapter__grid {
  display: grid;
  gap: var(--sp-1);
}

.page-about .about-chapter__note {
  display: none;
}

.page-about .about-chapter__body p {
  font-size: 16px;
  line-height: 1.8;
  margin: 0 0 18px;
  color: rgba(16, 32, 26, 0.86);
  max-width: 56ch;
}

.page-about .about-chapter__figure img {
  width: 100%;
  border-radius: var(--r-md);
  aspect-ratio: 14 / 9;
  object-fit: cover;
}

/* ---------- 服务对象 ---------- */
.page-about .about-roles {
  list-style: none;
  margin: 0 0 var(--sp-2);
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--about-paper-line);
}

.page-about .about-role {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 4px 16px;
  padding: 22px 0;
  border-bottom: 1px solid var(--about-paper-line);
}

.page-about .about-role__num {
  grid-row: span 2;
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
  color: var(--pitch);
  line-height: 1.1;
}

.page-about .about-role__title {
  margin: 0;
  font-size: 19px;
  line-height: 1.4;
}

.page-about .about-role__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(16, 32, 26, 0.78);
}

.page-about .about-callout {
  padding: 26px 24px;
  background: var(--paper);
  border-left: 6px solid var(--rape);
  border-radius: 0 var(--r-md) var(--r-md) 0;
}

.page-about .about-callout__title {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--ink);
}

.page-about .about-callout__text {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.7;
  color: rgba(16, 32, 26, 0.78);
}

.page-about .about-callout__link {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--lake);
  text-decoration: none;
  border-bottom: 2px solid var(--lake);
  padding-bottom: 2px;
}

.page-about .about-callout__link:hover {
  color: var(--pitch);
  border-color: var(--pitch);
}

/* ---------- 数据方法 ---------- */
.page-about .about-method {
  display: grid;
  gap: var(--sp-2);
  align-items: start;
}

.page-about .about-flow {
  list-style: none;
  margin: var(--sp-1) 0 0;
  padding: 0;
  counter-reset: flow;
}

.page-about .about-flow__step {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  gap: 2px 16px;
  padding: 20px 0;
  border-top: 1px solid var(--about-hair);
}

.page-about .about-flow__num {
  grid-row: span 2;
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  color: var(--neon);
  line-height: 1;
}

.page-about .about-flow__title {
  margin: 0;
  font-size: 18px;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .about-flow__step p {
  margin: 4px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(244, 241, 231, 0.78);
}

.page-about .about-quote {
  margin-top: var(--sp-1);
  padding: 24px;
  background: rgba(183, 255, 106, 0.08);
  border: 1px solid rgba(183, 255, 106, 0.34);
  border-radius: var(--r-md);
}

.page-about .about-quote__line {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 17px;
  line-height: 1.5;
  color: var(--neon);
}

.page-about .about-quote__sub {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(244, 241, 231, 0.74);
}

.page-about .about-method__figure img {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border-radius: var(--r-lg);
  border: 1px solid var(--about-hair);
}

.page-about .about-method__figure figcaption {
  color: rgba(244, 241, 231, 0.66);
}

/* ---------- 版本演进 ---------- */
.page-about .about-versions {
  list-style: none;
  margin: 0 0 var(--sp-1);
  padding: 0 0 14px;
  display: flex;
  gap: 14px;
  align-items: flex-start;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-versions__item {
  flex: 0 0 78%;
  scroll-snap-align: start;
}

.page-about .about-version {
  height: 100%;
  padding: 20px 18px;
  background: rgba(217, 232, 222, 0.5);
  border: 1px solid var(--about-paper-line);
  border-radius: var(--r-md);
}

.page-about .about-version[open] {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--paper);
}

.page-about .about-version__sum {
  display: flex;
  flex-direction: column;
  gap: 6px;
  cursor: pointer;
  list-style: none;
}

.page-about .about-version__sum::-webkit-details-marker {
  display: none;
}

.page-about .about-version__tag {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--pitch);
}

.page-about .about-version[open] .about-version__tag {
  color: var(--neon);
}

.page-about .about-version__name {
  font-size: 15px;
  font-weight: 700;
  color: var(--char);
}

.page-about .about-version[open] .about-version__name {
  color: var(--paper);
}

.page-about .about-version__body {
  margin: 14px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(244, 241, 231, 0.82);
}

.page-about .about-versions__figure img {
  width: 100%;
  aspect-ratio: 2 / 1;
  object-fit: cover;
  border-radius: var(--r-md);
}

/* ---------- 团队与协作 ---------- */
.page-about .about-team {
  margin-bottom: var(--sp-2);
}

.page-about .about-team__bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: var(--sp-1);
}

.page-about .about-team__bar .filter-btn {
  padding: 9px 16px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--paper);
  background: rgba(244, 241, 231, 0.1);
  border: 1px solid var(--about-hair);
  border-radius: var(--r-pill);
  cursor: pointer;
  transition: background 160ms var(--ease), color 160ms var(--ease);
}

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

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

.page-about .about-team__card {
  padding: 22px 20px;
  background: rgba(11, 47, 38, 0.44);
  border: 1px solid var(--about-hair);
  border-radius: var(--r-md);
}

.page-about .about-team__card p {
  margin: 8px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(244, 241, 231, 0.8);
}

.page-about .about-team__title {
  margin: 0;
  font-size: 18px;
  color: var(--neon);
}

.page-about [data-filter-item].is-filtered-out {
  display: none;
}

.page-about .about-network {
  display: grid;
  gap: 16px;
  margin: 0;
  padding-top: var(--sp-1);
  border-top: 1px solid var(--about-hair);
}

.page-about .about-network__item {
  display: grid;
  gap: 6px;
}

.page-about .about-network__item dt {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--rape);
}

.page-about .about-network__item dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(244, 241, 231, 0.82);
}

.page-about .about-network__item .about-num {
  display: inline;
  font-size: 22px;
  color: var(--paper);
}

/* ---------- 收束 ---------- */
.page-about .about-end {
  display: grid;
  gap: var(--sp-2);
}

.page-about .about-end__text {
  font-size: 16px;
  line-height: 1.8;
  color: rgba(244, 241, 231, 0.82);
  margin: 0 0 var(--sp-1);
  max-width: 52ch;
}

.page-about .about-end__contact {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--paper);
}

.page-about .about-end__label {
  display: inline-block;
  min-width: 74px;
  font-family: var(--font-sans);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: rgba(244, 241, 231, 0.58);
}

.page-about .about-end__links {
  display: grid;
  gap: 1px;
  background: var(--about-hair);
  border-top: 1px solid var(--about-hair);
  border-bottom: 1px solid var(--about-hair);
}

.page-about .about-end__link {
  display: grid;
  gap: 4px;
  padding: 18px 16px;
  background: var(--indigo);
  text-decoration: none;
  transition: background 160ms var(--ease);
}

.page-about .about-end__link:hover,
.page-about .about-end__link:focus-visible {
  background: var(--ink);
}

.page-about .about-end__link-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-end__link-text {
  font-size: 13px;
  line-height: 1.6;
  color: rgba(244, 241, 231, 0.7);
}

/* ---------- 平板 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-roles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: var(--sp-1);
  }

  .page-about .about-versions__item {
    flex: 0 0 44%;
  }

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

  .page-about .about-network {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

/* ---------- 桌面 ---------- */
@media (min-width: 1000px) {
  .page-about .about-hero {
    padding-top: var(--sp-2);
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: var(--sp-2);
    align-items: center;
  }

  .page-about .about-hero .display-title {
    margin-bottom: 28px;
  }

  .page-about .about-chapter {
    padding: var(--sp-3) 0;
  }

  .page-about .about-chapter__grid {
    grid-template-columns: 48px minmax(0, 6fr) minmax(0, 5fr);
    column-gap: var(--sp-1);
    align-items: start;
  }

  .page-about .about-chapter__note {
    display: block;
    writing-mode: vertical-rl;
    transform: rotate(180deg);
    margin: 6px 0 0;
    font-family: var(--font-mono);
    font-size: 12px;
    letter-spacing: 0.24em;
    color: rgba(31, 122, 77, 0.62);
    white-space: nowrap;
  }

  .page-about .about-chapter__figure {
    position: sticky;
    top: 96px;
  }

  .page-about .about-method {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: var(--sp-2);
  }

  .page-about .about-method__figure {
    position: sticky;
    top: 96px;
  }

  .page-about .about-flow__step {
    grid-template-columns: 64px minmax(0, 1fr);
    padding: 24px 0;
  }

  .page-about .about-flow__num {
    font-size: 32px;
  }

  .page-about .about-roles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: var(--sp-2);
  }

  .page-about .about-role {
    grid-template-columns: 56px minmax(0, 1fr);
    padding: 26px 0;
  }

  .page-about .about-versions__item {
    flex: 0 0 26%;
  }

  .page-about .about-versions__figure {
    margin-top: var(--sp-1);
  }

  .page-about .about-end {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    gap: var(--sp-2);
    align-items: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-end__link,
  .page-about .about-team__bar .filter-btn {
    transition: none;
  }
}
<<<END>>>