.page-about {
  font-family: var(--font-body);
  color: var(--cream);
  line-height: 1.75;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: clamp(1.25rem, 3vw, 2.25rem) 0 clamp(2.5rem, 6vw, 4.5rem);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.75rem, 4vw, 3rem);
  align-items: end;
}

.page-about .about-hero__title {
  margin: .35rem 0 .5rem;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(2.6rem, 8vw, 5.4rem);
  line-height: 1.06;
  letter-spacing: .06em;
  color: var(--cream);
}

.page-about .about-hero__lede {
  max-width: 34em;
  margin: 0;
  font-size: clamp(1rem, 1.4vw, 1.1rem);
  line-height: 1.85;
  color: rgba(243, 238, 228, .78);
}

.page-about .about-hero__claim {
  display: flex;
  align-items: center;
  gap: .65rem;
  margin: 1.6rem 0 0;
  font-family: var(--font-display);
  font-size: clamp(1.05rem, 2vw, 1.4rem);
  letter-spacing: .16em;
  color: var(--mist);
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.25rem 1.25rem;
  margin: 2rem 0 0;
  padding: 1.5rem 0 0;
  border-top: 1px solid var(--line);
  list-style: none;
}

.page-about .about-stat__value {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.5rem, 3.6vw, 2.1rem);
  line-height: 1.15;
  color: var(--cream);
}

.page-about .about-stat__value em {
  font-style: normal;
  margin-left: .12em;
  font-size: .52em;
  letter-spacing: .06em;
  color: var(--mist);
}

.page-about .about-stat__label {
  display: block;
  margin-top: .35rem;
  font-size: .76rem;
  letter-spacing: .14em;
  color: rgba(243, 238, 228, .5);
}

.page-about .about-hero__figure {
  margin: 0;
  position: relative;
  background: var(--rock);
  border: 1px solid var(--line);
  clip-path: polygon(var(--cut) 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%, 0 var(--cut));
}

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

.page-about .about-hero__figure figcaption {
  padding: .85rem 1.05rem 1rem;
  font-size: .8rem;
  line-height: 1.7;
  letter-spacing: .04em;
  color: rgba(243, 238, 228, .55);
  border-top: 1px solid var(--line);
}

/* ---------- 主体两栏 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.75rem, 4vw, 3rem);
  padding-bottom: clamp(3rem, 8vw, 6rem);
}

.page-about .about-rail__list {
  display: flex;
  gap: .35rem;
  overflow-x: auto;
  margin: 0;
  padding: 0 0 .5rem;
  list-style: none;
  border-bottom: 1px solid var(--line);
}

.page-about .about-rail__link {
  display: inline-flex;
  align-items: center;
  gap: .45rem;
  padding: .42rem .7rem;
  white-space: nowrap;
  font-size: .82rem;
  letter-spacing: .06em;
  color: var(--mist);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

.page-about .about-rail__num {
  font-family: var(--font-mono);
  font-size: .7rem;
  color: var(--nebula);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--cyan);
}

.page-about .about-rail__link.is-active {
  color: var(--cream);
  border-bottom-color: var(--gold);
}

/* ---------- 章节 ---------- */
.page-about .about-section {
  padding-block: clamp(2.25rem, 5vw, 3.5rem);
  scroll-margin-top: 6rem;
}

.page-about .about-section__head {
  display: grid;
  gap: .8rem;
  max-width: 44rem;
  margin-bottom: clamp(1.6rem, 4vw, 2.6rem);
}

.page-about .about-section__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .18em;
  color: var(--nebula);
}

.page-about .about-section__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(1.7rem, 4.2vw, 2.7rem);
  line-height: 1.22;
  letter-spacing: .05em;
  color: var(--cream);
}

.page-about .about-section__lead {
  margin: 0;
  max-width: 36em;
  font-size: 1rem;
  line-height: 1.9;
  color: rgba(243, 238, 228, .72);
}

.page-about .about-section a {
  color: var(--cyan);
  text-decoration-color: rgba(63, 201, 232, .35);
  text-underline-offset: 3px;
}

.page-about .about-section a:hover,
.page-about .about-section a:focus-visible {
  color: var(--gold);
}

.page-about .about-note {
  max-width: 36em;
  margin: 1.75rem 0 0;
  padding-left: 1.1rem;
  border-left: 2px solid var(--graphite);
  font-size: .92rem;
  line-height: 1.85;
  color: rgba(243, 238, 228, .62);
}

.page-about .slash-divider {
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--graphite) 18%, rgba(107, 75, 214, .5) 62%, transparent);
  transform: rotate(-.6deg);
  transform-origin: left center;
}

.page-about .slash-divider--flip {
  transform: rotate(.6deg);
  transform-origin: right center;
}

/* ---------- 01 坐标 ---------- */
.page-about .coords {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1rem;
}

.page-about .coord {
  display: grid;
  align-content: start;
  gap: .7rem;
  padding: 1.5rem 1.35rem 1.6rem;
  background: linear-gradient(155deg, rgba(107, 75, 214, .18), rgba(35, 38, 47, .92) 62%);
  clip-path: polygon(var(--cut) 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%, 0 var(--cut));
}

.page-about .coord__tag {
  justify-self: start;
}

.page-about .coord__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 1.12rem;
  line-height: 1.5;
  letter-spacing: .04em;
  color: var(--cream);
}

.page-about .coord__text {
  margin: 0;
  font-size: .94rem;
  line-height: 1.85;
  color: rgba(243, 238, 228, .7);
}

/* ---------- 02 时间线 ---------- */
.page-about .journey-figure {
  margin: 0 0 clamp(1.75rem, 4vw, 2.75rem);
  border: 1px solid var(--line);
  clip-path: polygon(var(--cut) 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%, 0 var(--cut));
  background: var(--rock);
}

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

.page-about .journey-figure figcaption {
  padding: .8rem 1.05rem .95rem;
  font-size: .8rem;
  letter-spacing: .04em;
  color: rgba(243, 238, 228, .55);
  border-top: 1px solid var(--line);
}

.page-about .journey {
  position: relative;
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.25rem);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .journey::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 12px;
  bottom: 12px;
  width: 1px;
  background: linear-gradient(180deg, var(--clay), var(--moss) 48%, var(--gold));
  opacity: .5;
}

.page-about .journey__item {
  position: relative;
  padding-left: 2.1rem;
}

.page-about .journey__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: .9rem;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--mist);
}

.page-about .journey__item--clay::before {
  border-color: var(--clay);
}

.page-about .journey__item--jade::before {
  border-color: var(--moss);
}

.page-about .journey__item--gold::before {
  border-color: var(--gold);
  box-shadow: 0 0 0 5px rgba(233, 183, 93, .12);
}

.page-about .journey__card {
  display: grid;
  gap: .6rem;
  padding: clamp(1.1rem, 3vw, 1.7rem);
  background: var(--rock);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%);
}

.page-about .journey__years {
  margin: 0;
  font-size: .82rem;
  letter-spacing: .16em;
  color: var(--mist);
}

.page-about .journey__item--clay .journey__years {
  color: var(--clay);
}

.page-about .journey__item--jade .journey__years {
  color: var(--moss);
}

.page-about .journey__item--gold .journey__years {
  color: var(--gold);
}

.page-about .journey__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(1.12rem, 2.4vw, 1.4rem);
  line-height: 1.45;
  letter-spacing: .04em;
  color: var(--cream);
}

.page-about .journey__text {
  margin: 0;
  font-size: .95rem;
  line-height: 1.85;
  color: rgba(243, 238, 228, .7);
}

.page-about .journey__more {
  margin-top: .35rem;
  padding-top: .75rem;
  border-top: 1px solid var(--line);
}

.page-about .stage__trigger {
  width: 100%;
  display: block;
  padding: .2rem 0;
  background: none;
  border: 0;
  font: inherit;
  font-size: .86rem;
  letter-spacing: .06em;
  text-align: left;
  color: var(--cyan);
  cursor: pointer;
}

.page-about .stage__trigger:hover,
.page-about .stage__trigger:focus-visible {
  color: var(--gold);
}

.page-about .stage__panel {
  padding-top: .65rem;
}

.page-about .stage__panel p {
  margin: 0;
  font-size: .9rem;
  line-height: 1.9;
  color: rgba(243, 238, 228, .66);
}

/* ---------- 03 资料库 ---------- */
.page-about .library {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 2.5rem);
}

.page-about .library__figure {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--rock);
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, 0 100%);
}

.page-about .library__figure img {
  display: block;
  width: 100%;
  height: auto;
  max-height: 520px;
  object-fit: cover;
}

.page-about .library__figure figcaption {
  padding: .8rem 1.05rem .95rem;
  font-size: .8rem;
  letter-spacing: .04em;
  color: rgba(243, 238, 228, .55);
  border-top: 1px solid var(--line);
}

.page-about .library__tabs {
  display: grid;
  gap: 1.25rem;
  align-content: start;
}

.page-about .tabs__list {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
}

.page-about .tabs__tab {
  font: inherit;
  font-size: .86rem;
  letter-spacing: .06em;
  padding: .5rem .95rem;
  background: rgba(243, 238, 228, .04);
  border: 1px solid var(--line-strong);
  color: var(--mist);
  cursor: pointer;
  clip-path: polygon(8px 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%, 0 8px);
  transition: color .2s var(--ease), background-color .2s var(--ease), border-color .2s var(--ease);
}

.page-about .tabs__tab:hover,
.page-about .tabs__tab:focus-visible {
  color: var(--cream);
  border-color: var(--cyan);
}

.page-about .tabs__tab[aria-selected="true"] {
  color: var(--ink);
  background: var(--gold);
  border-color: var(--gold);
}

.page-about .tabs__panel {
  padding: 1.35rem 1.3rem 1.5rem;
  border-left: 2px solid var(--moss);
  background: linear-gradient(120deg, rgba(126, 156, 108, .08), transparent 70%);
}

.page-about .tabs__panel-title {
  margin: 0 0 .65rem;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 1.1rem;
  line-height: 1.5;
  letter-spacing: .04em;
  color: var(--cream);
}

.page-about .tabs__panel p {
  margin: 0 0 .85rem;
  font-size: .94rem;
  line-height: 1.9;
  color: rgba(243, 238, 228, .72);
}

.page-about .mini-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: .45rem;
}

.page-about .mini-list li {
  position: relative;
  padding-left: 1rem;
  font-size: .86rem;
  line-height: 1.75;
  color: rgba(243, 238, 228, .58);
}

.page-about .mini-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .68em;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--moss);
}

/* ---------- 04 团队 ---------- */
.page-about .team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 2.25rem);
}

.page-about .team__list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .team__item {
  display: grid;
  gap: .35rem;
  padding: 1.1rem 0;
  border-bottom: 1px solid var(--line);
}

.page-about .team__key {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.05rem;
  letter-spacing: .12em;
  color: var(--cyan);
}

.page-about .team__role {
  margin: 0;
  font-size: .93rem;
  line-height: 1.85;
  color: rgba(243, 238, 228, .7);
}

.page-about .team__side {
  padding: 1.5rem 1.35rem 1.6rem;
  background: linear-gradient(150deg, rgba(107, 75, 214, .2), rgba(35, 38, 47, .94) 65%);
  clip-path: polygon(var(--cut) 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%, 0 var(--cut));
}

.page-about .team__side-label {
  margin: 0;
  font-size: .74rem;
  letter-spacing: .18em;
  color: var(--mist);
}

.page-about .team__side-number {
  margin: .35rem 0 .8rem;
  font-size: clamp(2.2rem, 6vw, 3.2rem);
  line-height: 1;
  color: var(--gold);
}

.page-about .team__side-text {
  margin: 0 0 .85rem;
  font-size: .92rem;
  line-height: 1.9;
  color: rgba(243, 238, 228, .7);
}

.page-about .team__side-text:last-child {
  margin-bottom: 0;
}

/* ---------- 05 节奏 ---------- */
.page-about .cadence {
  border-top: 1px solid var(--line);
}

.page-about .cadence__beat {
  display: grid;
  gap: .3rem;
  padding: 1.35rem 0;
  border-bottom: 1px solid var(--line);
}

.page-about .cadence__when {
  margin: 0;
  font-size: .9rem;
  letter-spacing: .14em;
  color: var(--gold);
}

.page-about .cadence__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 1.08rem;
  line-height: 1.5;
  letter-spacing: .04em;
  color: var(--cream);
}

.page-about .cadence__text {
  margin: 0;
  font-size: .93rem;
  line-height: 1.85;
  color: rgba(243, 238, 228, .68);
}

.page-about .topics {
  margin-top: clamp(1.75rem, 4vw, 2.5rem);
  padding: 1.4rem 1.3rem 1.5rem;
  border: 1px solid var(--line);
  background: rgba(243, 238, 228, .03);
}

.page-about .topics__lead {
  margin: 0 0 1rem;
  max-width: 34em;
  font-size: .95rem;
  line-height: 1.9;
  color: rgba(243, 238, 228, .72);
}

.page-about .topics__list {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin: 0 0 1rem;
  padding: 0;
  list-style: none;
}

.page-about .topics__item {
  padding: .35rem .8rem;
  font-size: .82rem;
  letter-spacing: .06em;
  color: var(--mist);
  background: rgba(107, 75, 214, .18);
  clip-path: polygon(7px 0, 100% 0, 100% calc(100% - 7px), calc(100% - 7px) 100%, 0 100%, 0 7px);
}

.page-about .topics__note {
  margin: 0;
  font-size: .88rem;
  line-height: 1.85;
  color: rgba(243, 238, 228, .58);
}

/* ---------- 06 联系 ---------- */
.page-about .about-section--reach {
  padding-bottom: clamp(2.5rem, 6vw, 4rem);
}

.page-about .reach {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 2.5rem);
  padding-top: clamp(1.25rem, 3vw, 1.75rem);
  border-top: 1px solid var(--line-strong);
}

.page-about .reach__list {
  margin: 0;
}

.page-about .reach__row {
  display: grid;
  gap: .2rem;
  padding: .9rem 0;
  border-bottom: 1px dashed var(--line-strong);
}

.page-about .reach__key {
  font-size: .74rem;
  letter-spacing: .18em;
  color: var(--mist);
}

.page-about .reach__value {
  margin: 0;
  font-size: .98rem;
  line-height: 1.7;
  color: var(--cream);
  overflow-wrap: anywhere;
}

.page-about .reach__side {
  align-self: start;
  display: grid;
  gap: 1.15rem;
}

.page-about .reach__side p {
  margin: 0;
  font-size: .93rem;
  line-height: 1.9;
  color: rgba(243, 238, 228, .68);
}

.page-about .reach__side .btn {
  justify-self: start;
}

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

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

  .page-about .cadence__beat {
    grid-template-columns: 8.5rem minmax(0, 1fr);
    align-items: baseline;
    column-gap: 1.5rem;
  }

  .page-about .cadence__beat .cadence__title,
  .page-about .cadence__beat .cadence__text {
    grid-column: 2;
  }

  .page-about .reach__row {
    grid-template-columns: 8.5rem minmax(0, 1fr);
    align-items: baseline;
    column-gap: 1.5rem;
  }
}

@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: clamp(2rem, 5vw, 4.5rem);
  }

  .page-about .library {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
  }

  .page-about .team {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
  }

  .page-about .reach {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }
}

@media (min-width: 1024px) {
  .page-about .about-body {
    grid-template-columns: 11.5rem minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 6.5rem;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding: 0;
    border-bottom: 0;
  }

  .page-about .about-rail__link {
    padding: .45rem .2rem;
    border-bottom: 1px solid transparent;
  }

  .page-about .about-rail__link.is-active {
    border-bottom-color: var(--gold);
  }

  .page-about .about-flow {
    border-left: 1px solid var(--line);
    padding-left: clamp(1.5rem, 3vw, 2.75rem);
  }
}

@media (max-width: 959px) {
  .page-about .about-hero__figure img {
    max-height: 420px;
    object-position: center 28%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail__link,
  .page-about .tabs__tab,
  .page-about .stage__trigger {
    transition: none;
  }

  .page-about .slash-divider,
  .page-about .slash-divider--flip {
    transform: none;
  }
}
</main>
<<<END>>>