.page-about {
  --about-rail: 232px;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background: var(--deep);
  color: var(--paper);
  padding: clamp(26px, 5vw, 54px) 0 clamp(84px, 12vw, 152px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(118deg, transparent 0 50%, rgba(23, 184, 176, .16) 50% 54%, transparent 54%),
    radial-gradient(circle at 84% 14%, rgba(23, 184, 176, .2), transparent 44%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: clamp(46px, 9vw, 108px);
  background: var(--paper);
  clip-path: polygon(0 100%, 100% 0, 100% 100%);
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  max-width: var(--max);
  margin-inline: auto;
  padding-inline: var(--gutter);
  display: grid;
  gap: clamp(30px, 4vw, 52px);
}

.page-about .about-crumb {
  display: block;
  margin-bottom: clamp(16px, 3vw, 24px);
  font-size: .78rem;
}

.page-about .about-crumb__list {
  display: flex;
  flex-wrap: wrap;
  gap: .4em;
  margin: 0;
  padding: 0;
  list-style: none;
  color: rgba(252, 250, 246, .58);
}

.page-about .about-crumb__list li + li::before {
  content: "/";
  margin-right: .45em;
  color: rgba(252, 250, 246, .32);
}

.page-about .about-crumb__list a {
  color: var(--aqua);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color .2s ease;
}

.page-about .about-crumb__list a:hover,
.page-about .about-crumb__list a:focus-visible {
  border-bottom-color: var(--aqua);
}

.page-about .about-hero .eyebrow {
  margin: 0;
  font-size: .72rem;
  letter-spacing: .2em;
  color: var(--signal);
}

.page-about .about-hero .display-title {
  margin: .26em 0 .5em;
  font-family: var(--font-title);
  font-weight: 900;
  font-size: clamp(2rem, 6.2vw, 3.9rem);
  line-height: 1.08;
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-about .about-hero .lead {
  max-width: 48ch;
  margin: 0;
  font-size: clamp(.96rem, 1.7vw, 1.08rem);
  line-height: 1.88;
  color: rgba(252, 250, 246, .82);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .about-hero .btn--ghost {
  color: var(--paper);
  border-color: rgba(252, 250, 246, .42);
}

.page-about .about-hero .btn--ghost:hover,
.page-about .about-hero .btn--ghost:focus-visible {
  color: var(--aqua);
  border-color: var(--aqua);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 18px;
  margin: clamp(24px, 4vw, 38px) 0 0;
  padding: clamp(16px, 3vw, 22px) 0 0;
  list-style: none;
  border-top: 1px solid var(--line-light);
}

.page-about .about-hero__facts li {
  display: flex;
  flex-direction: column;
  gap: 5px;
  min-width: 0;
}

.page-about .about-hero__facts .mono {
  font-size: clamp(1.35rem, 3vw, 1.85rem);
  line-height: 1;
  color: var(--signal);
}

.page-about .about-hero__facts span:last-child {
  font-size: .78rem;
  letter-spacing: .04em;
  line-height: 1.5;
  color: rgba(252, 250, 246, .6);
}

.page-about .about-hero__visual {
  margin: 0;
  padding: 10px;
  background: var(--paper);
  border: 1px solid var(--line-light);
  box-shadow: 10px 10px 0 rgba(23, 184, 176, .22), var(--shadow);
  transform: rotate(-1.2deg);
}

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

.page-about .about-hero__visual figcaption {
  padding: 8px 2px 0;
  font-size: .68rem;
  letter-spacing: .08em;
  color: var(--muted);
}

@media (min-width: 700px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: center;
  }

  .page-about .about-hero__visual {
    transform: rotate(-2.2deg);
  }
}

/* ---------- 主体栅格 ---------- */
.page-about .about-body {
  max-width: var(--max);
  margin-inline: auto;
  padding: clamp(40px, 6vw, 88px) var(--gutter) clamp(56px, 8vw, 104px);
  display: grid;
  gap: clamp(30px, 5vw, 60px);
}

@media (min-width: 1024px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    align-items: start;
  }
}

.page-about .about-index {
  border-left: 2px solid var(--line);
  padding-left: 14px;
}

.page-about .about-index__label {
  margin: 0 0 12px;
  font-size: .68rem;
  letter-spacing: .18em;
  color: var(--muted);
}

.page-about .about-index__rotate {
  display: none;
  margin: 0;
  font-size: .64rem;
  letter-spacing: .26em;
  color: var(--signal);
}

.page-about .section-index {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 6px;
  scrollbar-width: thin;
}

.page-about .section-index__link {
  display: inline-flex;
  align-items: center;
  flex: 0 0 auto;
  white-space: nowrap;
  padding: 7px 11px;
  font-size: .78rem;
  color: var(--muted);
  text-decoration: none;
  background: transparent;
  border: 1px solid var(--line);
  border-left: 3px solid transparent;
  transition: color .2s ease, background .2s ease, border-color .2s ease;
}

.page-about .section-index__link:hover,
.page-about .section-index__link:focus-visible {
  color: var(--deep);
  background: var(--sand);
}

.page-about .section-index__link[aria-current="true"],
.page-about .section-index__link[aria-current="location"],
.page-about .section-index__link.is-active {
  color: var(--deep);
  font-weight: 700;
  background: var(--sand);
  border-left-color: var(--signal);
}

@media (min-width: 1024px) {
  .page-about .about-index {
    position: sticky;
    top: calc(var(--header-h) + 28px);
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    column-gap: 12px;
    align-self: start;
  }

  .page-about .about-index__label {
    grid-column: 1;
  }

  .page-about .section-index {
    grid-column: 1;
    flex-direction: column;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-index__rotate {
    display: block;
    grid-column: 2;
    grid-row: 1 / span 2;
    justify-self: end;
    writing-mode: vertical-rl;
  }
}

/* ---------- 章节通用 ---------- */
.page-about .about-section {
  scroll-margin-top: calc(var(--header-h) + 24px);
}

.page-about .about-section + .about-section {
  margin-top: clamp(46px, 7vw, 92px);
  padding-top: clamp(38px, 6vw, 70px);
  border-top: 1px solid var(--line);
}

.page-about .about-section--sand {
  padding: clamp(22px, 4vw, 36px);
  background: var(--sand);
  border-top: 1px solid var(--line);
}

.page-about .about-head {
  display: grid;
  gap: 10px;
  margin-bottom: clamp(20px, 4vw, 34px);
}

.page-about .about-head .eyebrow {
  margin: 0;
  font-size: .7rem;
  letter-spacing: .2em;
  color: var(--signal);
}

.page-about .section-title {
  margin: 0;
  font-family: var(--font-title);
  font-weight: 800;
  font-size: clamp(1.45rem, 3.8vw, 2.3rem);
  line-height: 1.24;
  color: var(--deep);
}

.page-about .body-copy {
  max-width: 68ch;
  margin: 0 0 1.1em;
  font-size: 1rem;
  line-height: 1.88;
  color: var(--ink);
}

.page-about .about-note {
  margin-top: clamp(20px, 3vw, 30px);
  margin-bottom: 0;
  font-size: .94rem;
  line-height: 1.85;
  color: var(--deep);
  border-left: 3px solid var(--peach);
  padding-left: 14px;
}

.page-about .about-figure {
  margin: 0 0 clamp(22px, 4vw, 34px);
  padding: 8px;
  background: var(--sand);
  border: 1px solid var(--line);
}

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

.page-about .about-figure--narrow {
  margin-bottom: clamp(20px, 3vw, 28px);
}

/* ---------- 四类入口 ---------- */
.page-about .entry-list {
  margin: clamp(18px, 3vw, 28px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .entry-item {
  display: grid;
  grid-template-columns: 36px minmax(0, 1fr);
  gap: 14px;
  padding: 18px 0;
  border-top: 1px solid var(--line);
}

.page-about .entry-item:last-child {
  border-bottom: 1px solid var(--line);
}

.page-about .entry-item__no {
  padding-top: 3px;
  font-size: .76rem;
  color: var(--signal);
}

.page-about .entry-item h3 {
  margin: 0 0 5px;
  font-family: var(--font-title);
  font-size: 1.06rem;
  font-weight: 800;
  color: var(--deep);
}

.page-about .entry-item p {
  margin: 0;
  font-size: .93rem;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 六步路线 ---------- */
.page-about .route-steps {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}

.page-about .route-step {
  background: var(--paper);
  border: 1px solid var(--line);
  box-shadow: 4px 4px 0 var(--sand), 4px 4px 0 1px var(--line);
}

.page-about .route-step__summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .route-step__summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--muted);
}

.page-about .route-step details[open] .route-step__summary::after {
  content: "−";
  color: var(--warm);
}

.page-about .route-step__summary:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 2px;
}

.page-about .route-step__index {
  flex: 0 0 auto;
  padding: 2px 6px;
  font-size: .74rem;
  color: var(--deep);
  background: var(--aqua);
}

.page-about .route-step__name {
  font-family: var(--font-title);
  font-size: 1rem;
  font-weight: 800;
  color: var(--deep);
}

.page-about .route-step__body {
  padding: 0 16px 16px;
  border-top: 1px dashed var(--line);
}

.page-about .route-step__body p {
  margin: 12px 0;
  font-size: .93rem;
  line-height: 1.8;
  color: var(--ink);
}

.page-about .route-step__link {
  display: inline-block;
  font-size: .82rem;
  color: var(--deep);
  text-decoration: none;
  border-bottom: 2px solid var(--signal);
  padding-bottom: 2px;
  transition: color .2s ease, border-color .2s ease;
}

.page-about .route-step__link:hover,
.page-about .route-step__link:focus-visible {
  color: var(--warm);
  border-bottom-color: var(--warm);
}

/* ---------- 时间线 ---------- */
.page-about .timeline {
  position: relative;
  margin: 0;
  padding: 0 0 0 26px;
  list-style: none;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 14px;
  width: 2px;
  background: linear-gradient(var(--signal), rgba(23, 184, 176, .12));
}

.page-about .timeline__item {
  position: relative;
  display: grid;
  gap: 6px;
  padding-bottom: clamp(26px, 4vw, 40px);
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--paper);
  border: 3px solid var(--signal);
}

.page-about .timeline__item--now::before {
  background: var(--warm);
  border-color: var(--warm);
}

.page-about .timeline__head {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .timeline__year {
  font-size: clamp(1.05rem, 2.6vw, 1.4rem);
  letter-spacing: .04em;
  color: var(--deep);
}

.page-about .timeline__tag {
  padding: 2px 7px;
  font-size: .68rem;
  letter-spacing: .12em;
  color: var(--deep);
  background: var(--aqua);
}

.page-about .timeline__item--now .timeline__tag {
  background: var(--peach);
}

.page-about .timeline__title {
  margin: 2px 0 4px;
  font-family: var(--font-title);
  font-size: 1.04rem;
  font-weight: 800;
  color: var(--deep);
}

.page-about .timeline__body p {
  max-width: 64ch;
  margin: 0;
  font-size: .93rem;
  line-height: 1.82;
  color: var(--ink);
}

/* ---------- 团队数据 ---------- */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0 0 clamp(22px, 4vw, 32px);
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-stats li {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 15px 13px;
  background: var(--paper);
}

.page-about .about-stats .mono {
  font-size: clamp(1.3rem, 2.8vw, 1.66rem);
  line-height: 1;
  color: var(--deep);
}

.page-about .about-stats span:last-child {
  font-size: .78rem;
  line-height: 1.55;
  color: var(--muted);
}

.page-about .team-groups {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .team-groups li {
  padding: 12px 14px;
  background: var(--paper);
  border-left: 3px solid var(--signal);
}

.page-about .team-groups h3 {
  margin: 0 0 4px;
  font-family: var(--font-title);
  font-size: .96rem;
  font-weight: 800;
  color: var(--deep);
}

.page-about .team-groups p {
  margin: 0;
  font-size: .88rem;
  line-height: 1.75;
  color: var(--ink);
}

@media (min-width: 700px) {
  .page-about .about-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

/* ---------- 合作与荣誉 ---------- */
.page-about .partner-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 clamp(20px, 3vw, 30px);
  padding: 0;
  list-style: none;
}

.page-about .partner-tags li {
  padding: 6px 12px;
  font-size: .8rem;
  color: var(--deep);
  background: var(--paper);
  border: 1px solid var(--line);
}

.page-about .honor-wall {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .honor-wall li {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 6px 14px;
  padding: 14px 16px;
  font-size: .92rem;
  line-height: 1.7;
  color: var(--ink);
  background: var(--paper);
  border: 1px solid var(--line);
  border-top: 3px solid var(--warm);
}

.page-about .honor-wall .mono {
  font-size: .76rem;
  letter-spacing: .1em;
  color: var(--deep);
}

/* ---------- 覆盖与场景 ---------- */
.page-about .scene-list {
  margin: clamp(18px, 3vw, 26px) 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .scene-item {
  display: grid;
  grid-template-columns: 32px minmax(0, 1fr);
  gap: 14px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .scene-item__no {
  padding-top: 3px;
  font-size: .74rem;
  color: var(--signal);
}

.page-about .scene-item__body h3 {
  margin: 0 0 5px;
  font-family: var(--font-title);
  font-size: 1rem;
  font-weight: 800;
  color: var(--deep);
}

.page-about .scene-item__body p {
  margin: 0;
  font-size: .92rem;
  line-height: 1.8;
  color: var(--ink);
}

@media (min-width: 760px) {
  .page-about .scene-item__body {
    display: grid;
    grid-template-columns: 200px minmax(0, 1fr);
    gap: 18px;
    align-items: baseline;
  }

  .page-about .scene-item__body h3 {
    margin-bottom: 0;
  }
}

/* ---------- 结尾入口 ---------- */
.page-about .about-next {
  background: var(--deep);
  color: var(--paper);
  padding: clamp(44px, 7vw, 86px) var(--gutter);
}

.page-about .about-next__inner {
  max-width: var(--max);
  margin-inline: auto;
  display: grid;
  gap: 14px;
}

.page-about .about-next .eyebrow {
  margin: 0;
  font-size: .7rem;
  letter-spacing: .2em;
  color: var(--signal);
}

.page-about .about-next__title {
  margin: 0;
  font-family: var(--font-title);
  font-weight: 800;
  font-size: clamp(1.4rem, 3.4vw, 2.1rem);
  line-height: 1.28;
  color: var(--paper);
}

.page-about .about-next__lead {
  max-width: 56ch;
  margin: 0;
  font-size: .96rem;
  line-height: 1.85;
  color: rgba(252, 250, 246, .78);
}

.page-about .about-next__links {
  display: grid;
  gap: 10px;
  margin-top: clamp(14px, 3vw, 24px);
}

.page-about .about-next__link {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  grid-template-areas:
    "no title"
    "no desc";
  column-gap: 14px;
  row-gap: 3px;
  padding: 14px 16px;
  text-decoration: none;
  color: var(--paper);
  background: var(--panel);
  border: 1px solid var(--line-light);
  border-left: 3px solid var(--signal);
  transition: background .2s ease, border-color .2s ease;
}

.page-about .about-next__link .mono {
  grid-area: no;
  align-self: center;
  font-size: .74rem;
  color: var(--aurqa, var(--aqua));
}

.page-about .about-next__link strong {
  grid-area: title;
  font-family: var(--font-title);
  font-size: 1rem;
  font-weight: 800;
}

.page-about .about-next__link span:last-child {
  grid-area: desc;
  font-size: .84rem;
  line-height: 1.6;
  color: rgba(252, 250, 246, .68);
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  background: #164566;
  border-left-color: var(--aqua);
}

.page-about .about-next__link--warm {
  border-left-color: var(--warm);
}

.page-about .about-next__link--warm:hover,
.page-about .about-next__link--warm:focus-visible {
  border-left-color: var(--peach);
}

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-hero__visual {
    transform: none;
  }

  .page-about .section-index__link,
  .page-about .route-step__link,
  .page-about .about-next__link {
    transition: none;
  }
}
<<<END>>>

.page-about {
  --aurqa: currentColor;
}