.page-about {
  --ab-space: clamp(36px, 7vw, 92px);
  --ab-gutter: clamp(16px, 3vw, 34px);
  background: var(--cream);
  color: var(--ink);
  padding-bottom: clamp(48px, 8vw, 100px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  gap: var(--ab-gutter);
  padding: clamp(20px, 4vw, 46px) 0 clamp(28px, 5vw, 60px);
  position: relative;
}

.page-about .about-hero__eyebrow {
  margin: 0;
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--celadon);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.page-about .about-hero__eyebrow::before {
  content: "";
  width: 26px;
  height: 1px;
  background: var(--celadon);
  display: block;
}

.page-about .about-hero__title {
  margin: .5em 0 0;
  font-size: clamp(30px, 6vw, 58px);
  line-height: 1.12;
  letter-spacing: -.015em;
  font-weight: 800;
  color: var(--ink-deep);
}

.page-about .about-hero__lead {
  margin: 1em 0 0;
  max-width: 34em;
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.85;
  color: var(--ink-80);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-hero__figure {
  margin: 0;
  position: relative;
  z-index: 1;
}

.page-about .about-hero__figure::before {
  content: "";
  position: absolute;
  left: -6%;
  bottom: -8%;
  width: 52%;
  aspect-ratio: 1 / 1;
  background: var(--mist);
  border-radius: 46% 54% 60% 40% / 54% 42% 58% 46%;
  z-index: -1;
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  border-radius: var(--radius);
  object-fit: cover;
  box-shadow: var(--shadow-soft);
}

.page-about .about-hero__figure .media__caption {
  margin-top: 12px;
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--ink-60);
}

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

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, .94fr);
    align-items: end;
    column-gap: clamp(28px, 5vw, 68px);
  }

  .page-about .about-hero__annot {
    display: block;
    position: absolute;
    right: 0;
    top: 26px;
    writing-mode: vertical-rl;
    font-size: 11px;
    letter-spacing: .32em;
    color: var(--ink-60);
  }
}

/* ---------- 章节索引条 ---------- */
.page-about .about-jump {
  position: sticky;
  top: var(--bar-h);
  z-index: 15;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 8px 0;
  border-top: 1px solid var(--sand);
  border-bottom: 1px solid var(--sand);
  background: rgba(248, 242, 231, .94);
  backdrop-filter: blur(10px);
  overflow-x: auto;
  scrollbar-width: none;
}

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

.page-about .about-jump__label {
  flex: none;
  font-size: 11px;
  letter-spacing: .24em;
  color: var(--ink-60);
}

.page-about .about-jump__list {
  display: flex;
  gap: 4px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-jump__list a {
  display: inline-block;
  padding: 6px 13px;
  border-radius: 999px;
  font-size: 13px;
  letter-spacing: .05em;
  color: var(--ink-80);
  text-decoration: none;
  white-space: nowrap;
  transition: background-color .22s var(--ease), color .22s var(--ease);
}

.page-about .about-jump__list a:hover,
.page-about .about-jump__list a:focus-visible {
  background: var(--mist);
  color: var(--ink-deep);
}

.page-about .about-jump__list a.is-active {
  background: var(--celadon);
  color: var(--cream);
}

/* ---------- 章节通用 ---------- */
.page-about .about-chapter {
  padding: var(--ab-space) 0;
  border-bottom: 1px solid var(--sand);
  scroll-margin-top: calc(var(--bar-h) + 76px);
}

.page-about .about-chapter__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: clamp(14px, 3vw, 30px);
  align-items: start;
  margin-bottom: clamp(20px, 4vw, 40px);
}

.page-about .about-chapter__num {
  font-size: clamp(40px, 8vw, 92px);
  line-height: .82;
  font-weight: 800;
  letter-spacing: -.04em;
  color: rgba(47, 111, 99, .2);
  font-variant-numeric: tabular-nums;
}

.page-about .about-chapter h2 {
  margin: 6px 0 0;
  font-size: clamp(23px, 3.6vw, 36px);
  line-height: 1.24;
  letter-spacing: -.01em;
  font-weight: 800;
  color: var(--ink-deep);
}

.page-about .about-chapter .label {
  margin: 0;
  color: var(--celadon);
}

/* ---------- 01 起源 ---------- */
.page-about .about-origin {
  display: grid;
  gap: clamp(20px, 4vw, 44px);
}

.page-about .about-origin__text p {
  margin: 0 0 1.1em;
  font-size: 16px;
  line-height: 1.9;
  color: var(--ink-80);
  max-width: 36em;
}

.page-about .about-origin__text p:last-child {
  margin-bottom: 0;
}

.page-about .about-origin__aside {
  align-self: start;
  padding: clamp(22px, 3vw, 32px);
}

.page-about .about-origin__aside-title {
  margin: 0 0 12px;
  font-size: 13px;
  letter-spacing: .18em;
  color: var(--celadon);
  font-weight: 700;
}

.page-about .about-origin__aside-body {
  margin: 0;
  font-size: 15px;
  line-height: 1.9;
  color: var(--ink-80);
}

@media (min-width: 900px) {
  .page-about .about-origin {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, .65fr);
    align-items: start;
  }

  .page-about .about-origin__aside {
    position: relative;
    margin-top: 6px;
  }

  .page-about .about-origin__aside::before {
    content: "";
    position: absolute;
    left: -18px;
    top: 14px;
    bottom: 30%;
    width: 2px;
    background: var(--gold);
  }
}

/* ---------- 02 取舍 ---------- */
.page-about .about-design__intro {
  margin: 0 0 clamp(22px, 4vw, 38px);
  max-width: 40em;
  font-size: 16px;
  line-height: 1.9;
  color: var(--ink-80);
}

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

.page-about .about-design__item {
  padding: clamp(18px, 3vw, 26px);
  border-radius: var(--radius-sm);
  border: 1px solid var(--sand);
  background: rgba(255, 255, 255, .55);
  position: relative;
}

.page-about .about-design__item:nth-child(2) {
  background: var(--mist);
  border-color: transparent;
}

.page-about .about-design__item:nth-child(3) {
  background: rgba(43, 74, 111, .07);
  border-color: transparent;
}

.page-about .about-design__idx {
  display: block;
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--lake);
  margin-bottom: 10px;
}

.page-about .about-design__item h3 {
  margin: 0 0 8px;
  font-size: 17px;
  line-height: 1.5;
  font-weight: 700;
  color: var(--ink-deep);
}

.page-about .about-design__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--ink-80);
}

.page-about .about-design__outcome {
  margin: clamp(22px, 4vw, 36px) 0 0;
  padding: 18px 20px;
  border-left: 3px solid var(--coral);
  background: rgba(200, 83, 51, .06);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-deep);
}

@media (min-width: 760px) {
  .page-about .about-design__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-design__item:nth-child(1) {
    transform: translateY(-10px);
  }

  .page-about .about-design__item:nth-child(4) {
    transform: translateY(10px);
  }
}

@media (min-width: 1080px) {
  .page-about .about-design__list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .about-design__item:nth-child(1) { transform: translateY(-14px); }
  .page-about .about-design__item:nth-child(2) { transform: translateY(8px); }
  .page-about .about-design__item:nth-child(3) { transform: translateY(-6px); }
  .page-about .about-design__item:nth-child(4) { transform: translateY(16px); }
}

/* ---------- 03 团队 ---------- */
.page-about .about-team__intro {
  display: grid;
  gap: 20px;
}

.page-about .about-team__intro > p {
  margin: 0;
  max-width: 40em;
  font-size: 16px;
  line-height: 1.9;
  color: var(--ink-80);
}

.page-about .about-team__filter {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .about-team__filter label {
  display: inline-block;
  padding: 7px 14px;
  border-radius: 999px;
  border: 1px solid var(--sand);
  font-size: 13px;
  letter-spacing: .03em;
  color: var(--ink-80);
  cursor: pointer;
  background: transparent;
  transition: background-color .22s var(--ease), color .22s var(--ease), border-color .22s var(--ease);
}

.page-about .about-team__filter label:hover {
  border-color: var(--celadon);
  color: var(--ink-deep);
}

.page-about .about-team__filter input:checked + label {
  background: var(--celadon);
  border-color: var(--celadon);
  color: var(--cream);
}

.page-about .about-team__filter input:focus-visible + label {
  outline: 2px solid var(--lake);
  outline-offset: 2px;
}

.page-about .about-team__roles {
  margin: clamp(20px, 4vw, 34px) 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 14px;
}

.page-about .about-role {
  padding: clamp(18px, 3vw, 26px);
  border: 1px solid var(--sand);
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, .7);
}

.page-about .about-role h3 {
  margin: 12px 0 8px;
  font-size: 17px;
  line-height: 1.5;
  font-weight: 700;
  color: var(--ink-deep);
}

.page-about .about-role p {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--ink-80);
}

.page-about .about-team:has(#role-edit:checked) .about-role:not([data-role~="edit"]),
.page-about .about-team:has(#role-nav:checked) .about-role:not([data-role~="nav"]),
.page-about .about-team:has(#role-tech:checked) .about-role:not([data-role~="tech"]),
.page-about .about-team:has(#role-cs:checked) .about-role:not([data-role~="cs"]) {
  display: none;
}

.page-about .about-team__figure {
  margin: clamp(26px, 5vw, 48px) 0 0;
}

.page-about .about-team__figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  border-radius: var(--radius);
  object-fit: cover;
  box-shadow: var(--shadow-soft);
}

.page-about .about-team__figure .media__caption,
.page-about .about-versions__figure .media__caption {
  margin-top: 12px;
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--ink-60);
}

@media (min-width: 760px) {
  .page-about .about-team__roles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1080px) {
  .page-about .about-team__intro {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
    gap: 32px;
  }

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

/* ---------- 04 版本时间线 ---------- */
.page-about .about-versions__intro {
  margin: 0 0 clamp(20px, 4vw, 34px);
  max-width: 40em;
  font-size: 16px;
  line-height: 1.9;
  color: var(--ink-80);
}

.page-about .about-timeline {
  margin: 0;
  padding: 6px 2px 18px;
  list-style: none;
  display: flex;
  gap: 12px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  scrollbar-width: thin;
  scrollbar-color: var(--sand) transparent;
}

.page-about .about-timeline::-webkit-scrollbar {
  height: 6px;
}

.page-about .about-timeline::-webkit-scrollbar-thumb {
  background: var(--sand);
  border-radius: 999px;
}

.page-about .about-node {
  flex: 0 0 clamp(220px, 62vw, 258px);
  scroll-snap-align: start;
  align-self: flex-start;
}

.page-about .about-node details {
  border: 1px solid var(--sand);
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, .62);
  overflow: hidden;
  transition: border-color .22s var(--ease), background-color .22s var(--ease);
}

.page-about .about-node details[open] {
  background: var(--mist);
  border-color: transparent;
}

.page-about .about-node summary {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 4px 10px;
  align-items: baseline;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-node__ver {
  font-size: 13px;
  letter-spacing: .16em;
  color: var(--celadon);
  font-weight: 700;
}

.page-about .about-node__year {
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--ink-60);
  text-align: right;
}

.page-about .about-node__title {
  grid-column: 1 / -1;
  font-size: 16px;
  line-height: 1.45;
  font-weight: 700;
  color: var(--ink-deep);
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
}

.page-about .about-node__title::after {
  content: "+";
  flex: none;
  font-size: 18px;
  line-height: 1;
  color: var(--lake);
}

.page-about .about-node details[open] .about-node__title::after {
  content: "–";
}

.page-about .about-node details p {
  margin: 0;
  padding: 0 18px 18px;
  font-size: 14px;
  line-height: 1.85;
  color: var(--ink-80);
}

.page-about .about-versions__figure {
  margin: clamp(24px, 4vw, 40px) 0 0;
}

.page-about .about-versions__figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  border-radius: var(--radius);
  object-fit: cover;
}

@media (min-width: 900px) {
  .page-about .about-node {
    flex: 0 0 236px;
  }
}

/* ---------- 05 流程 ---------- */
.page-about .about-quality__intro {
  margin: 0 0 clamp(22px, 4vw, 36px);
  max-width: 40em;
  font-size: 16px;
  line-height: 1.9;
  color: var(--ink-80);
}

.page-about .about-flow {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 16px;
}

.page-about .about-flow__step {
  position: relative;
  padding: clamp(18px, 3vw, 26px) clamp(18px, 3vw, 26px) clamp(18px, 3vw, 26px) clamp(22px, 3vw, 30px);
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, .6);
  border: 1px solid var(--sand);
}

.page-about .about-flow__step::before {
  content: "";
  position: absolute;
  left: 0;
  top: 18px;
  bottom: 18px;
  width: 3px;
  border-radius: 3px;
  background: var(--lake);
}

.page-about .about-flow__step:nth-child(2)::before {
  background: var(--celadon);
}

.page-about .about-flow__step:nth-child(3)::before {
  background: var(--coral);
}

.page-about .about-flow__no {
  display: block;
  font-size: 12px;
  letter-spacing: .22em;
  color: var(--ink-60);
  margin-bottom: 10px;
}

.page-about .about-flow__step h3 {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  color: var(--ink-deep);
}

.page-about .about-flow__step p {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--ink-80);
}

.page-about .about-quality__note {
  margin: clamp(20px, 3vw, 30px) 0 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--ink-60);
}

@media (min-width: 860px) {
  .page-about .about-flow {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }
}

/* ---------- 06 覆盖 ---------- */
.page-about .about-reach {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
}

.page-about .about-reach__text p {
  margin: 0 0 1.1em;
  font-size: 16px;
  line-height: 1.9;
  color: var(--ink-80);
  max-width: 34em;
}

.page-about .about-reach__text p:last-child {
  margin-bottom: 0;
}

.page-about .about-stats {
  margin: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--sand);
  border: 1px solid var(--sand);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.page-about .about-stat {
  background: var(--cream);
  padding: clamp(16px, 3vw, 24px);
}

.page-about .about-stat dt {
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--ink-60);
  margin-bottom: 10px;
}

.page-about .about-stat dd {
  margin: 0;
  font-size: clamp(24px, 3.6vw, 34px);
  line-height: 1.1;
  font-weight: 800;
  color: var(--celadon);
  letter-spacing: -.01em;
}

.page-about .about-reach__honor {
  margin: clamp(22px, 4vw, 32px) 0 0;
  padding: 14px 18px;
  border-radius: var(--radius-sm);
  background: rgba(43, 74, 111, .08);
  font-size: 14px;
  line-height: 1.8;
  color: var(--indigo);
}

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

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  padding-top: clamp(36px, 6vw, 76px);
}

.page-about .about-cta__inner {
  position: relative;
  padding: clamp(28px, 5vw, 56px);
  border-radius: var(--radius);
  background: var(--ink);
  color: var(--cream);
  overflow: hidden;
}

.page-about .about-cta__inner::after {
  content: "";
  position: absolute;
  right: -60px;
  bottom: -80px;
  width: 240px;
  height: 240px;
  border-radius: 50%;
  background: rgba(47, 111, 99, .5);
  filter: blur(4px);
}

.page-about .about-cta .label {
  margin: 0 0 10px;
  color: var(--gold);
  position: relative;
  z-index: 1;
}

.page-about .about-cta h2 {
  margin: 0 0 12px;
  font-size: clamp(22px, 3.4vw, 34px);
  line-height: 1.28;
  font-weight: 800;
  color: var(--cream);
  position: relative;
  z-index: 1;
}

.page-about .about-cta p {
  margin: 0;
  max-width: 34em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--cream-80);
  position: relative;
  z-index: 1;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
  position: relative;
  z-index: 1;
}

.page-about .about-cta .btn--ghost {
  color: var(--cream);
}
<<<END>>>