.page-about {
  --about-body-text: #232b39;
  --about-card: rgba(231, 214, 180, .34);
  background: var(--paper);
  color: var(--ink-black);
  overflow-x: hidden;
}

/* ---------- Hero ---------- */
.page-about .about-hero {
  position: relative;
  background: var(--ink-900);
  color: var(--paper);
  padding-block: clamp(76px, 11vw, 132px) clamp(56px, 8vw, 96px);
  border-bottom-left-radius: var(--r-xl);
  border-bottom-right-radius: var(--r-xl);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(168, 199, 216, .08) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(168, 199, 216, .08) 1px, transparent 1px);
  background-size: 68px 68px;
  -webkit-mask-image: radial-gradient(120% 90% at 15% 0%, #000 15%, transparent 72%);
  mask-image: radial-gradient(120% 90% at 15% 0%, #000 15%, transparent 72%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  width: 460px;
  height: 460px;
  right: -150px;
  top: -140px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(242, 181, 68, .22), rgba(95, 183, 163, .10) 45%, transparent 70%);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-hero .breadcrumbs {
  font-size: 13px;
  color: var(--mist);
}

.page-about .about-hero .breadcrumbs a {
  color: var(--mist);
  text-decoration: none;
}

.page-about .about-hero .breadcrumbs a:hover,
.page-about .about-hero .breadcrumbs a:focus-visible {
  color: var(--amber);
}

.page-about .about-hero .breadcrumbs span[aria-hidden="true"] {
  margin: 0 8px;
  opacity: .5;
}

.page-about .about-hero__eyebrow {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 14px;
  margin: clamp(26px, 4vw, 42px) 0 0;
  font-size: 13px;
  letter-spacing: .02em;
  color: var(--mist);
}

.page-about .about-hero__title {
  margin: clamp(18px, 2.6vw, 28px) 0 0;
  max-width: 16em;
  font-size: clamp(34px, 6vw, 68px);
  line-height: 1.08;
  letter-spacing: -.02em;
  font-weight: 800;
}

.page-about .about-hero__title span {
  display: block;
  color: var(--amber);
}

.page-about .about-hero__lede {
  margin: clamp(18px, 2.4vw, 26px) 0 0;
  max-width: 46ch;
  font-size: clamp(16px, 1.5vw, 18px);
  line-height: 1.78;
  color: var(--mist);
}

.page-about .about-hero__meta {
  list-style: none;
  margin: clamp(30px, 4.4vw, 48px) 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 14px 40px;
  border-top: 1px solid var(--line-dark);
  padding-top: clamp(18px, 2.4vw, 26px);
}

.page-about .about-hero__meta li {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .about-hero__meta-key {
  font-size: 12px;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--mist);
  opacity: .82;
}

.page-about .about-hero__meta-val {
  font-family: var(--font-mono);
  font-size: 19px;
  font-weight: 600;
  letter-spacing: .02em;
  color: var(--paper);
}

/* ---------- Layout ---------- */
.page-about .about-main {
  padding-block: clamp(40px, 6vw, 84px) clamp(56px, 8vw, 110px);
}

.page-about .about-grid {
  display: grid;
  gap: clamp(30px, 4.5vw, 48px);
}

.page-about .about-aside {
  border-top: 2px solid var(--ink-black);
  padding-top: 12px;
}

.page-about .about-aside__label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--ink-700);
}

.page-about .about-toc {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 6px;
  scrollbar-width: thin;
}

.page-about .about-toc li {
  flex: 0 0 auto;
}

.page-about .about-toc a {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 7px 14px;
  border: 1px solid var(--line-light);
  border-radius: var(--r-pill);
  text-decoration: none;
  color: var(--ink-black);
  font-size: 13px;
  white-space: nowrap;
  transition: border-color .2s var(--ease), color .2s var(--ease), background-color .2s var(--ease);
}

.page-about .about-toc a:hover,
.page-about .about-toc a:focus-visible {
  border-color: var(--amber);
  background: rgba(242, 181, 68, .14);
  color: var(--ink-900);
}

.page-about .about-toc__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .04em;
  color: var(--celadon-ink);
}

.page-about .about-toc__label {
  font-weight: 600;
}

@media (min-width: 960px) {
  .page-about .about-grid {
    grid-template-columns: minmax(0, 200px) minmax(0, 1fr);
    gap: clamp(48px, 7vw, 96px);
    align-items: start;
  }

  .page-about .about-aside {
    position: sticky;
    top: 104px;
  }

  .page-about .about-toc {
    display: grid;
    gap: 0;
    overflow: visible;
    padding-bottom: 0;
    margin-top: 12px;
  }

  .page-about .about-toc a {
    border: 0;
    border-bottom: 1px solid var(--line-light-soft);
    border-radius: 0;
    padding: 10px 0;
    width: 100%;
    white-space: normal;
  }

  .page-about .about-toc a:hover,
  .page-about .about-toc a:focus-visible {
    background: transparent;
    border-bottom-color: var(--amber);
    color: var(--amber-ink);
  }
}

/* ---------- Chapters ---------- */
.page-about .about-chapter {
  padding-block: clamp(32px, 4.4vw, 56px);
  border-top: 1px solid var(--line-light);
}

.page-about .about-chapter:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-chapter--last {
  padding-bottom: 0;
}

.page-about .about-chapter__kicker {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--amber-ink);
}

.page-about .about-chapter__kicker::before {
  content: "";
  width: 26px;
  height: 2px;
  border-radius: 2px;
  background: var(--amber);
}

.page-about .about-chapter__title {
  margin: 0 0 clamp(16px, 2.2vw, 24px);
  font-size: clamp(26px, 3.6vw, 40px);
  line-height: 1.2;
  letter-spacing: -.018em;
  font-weight: 800;
  color: var(--ink-900);
}

.page-about .about-chapter__body > p {
  max-width: 62ch;
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.82;
  color: var(--about-body-text);
}

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

.page-about .about-subhead {
  margin: clamp(28px, 4vw, 40px) 0 14px;
  font-size: clamp(18px, 2vw, 22px);
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--ink-900);
}

/* ---------- Figures ---------- */
.page-about .about-figure {
  margin: clamp(26px, 4vw, 40px) 0 0;
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--line-light);
}

.page-about .about-figure .media-frame__caption {
  font-size: 13px;
  line-height: 1.6;
}

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

/* ---------- Timeline ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 12px;
  bottom: 16px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--amber) 0%, var(--celadon) 52%, var(--ink-700) 100%);
}

.page-about .about-timeline > li {
  position: relative;
  padding-left: 34px;
  margin-bottom: 14px;
}

.page-about .about-timeline > li:last-child {
  margin-bottom: 0;
}

.page-about .about-timeline > li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 14px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--paper);
  border: 2px solid var(--ink-700);
  box-shadow: 0 0 0 3px var(--paper);
}

.page-about .about-timeline > li:last-child::before {
  background: var(--amber);
  border-color: var(--amber);
}

.page-about .about-node {
  background: var(--about-card);
  border: 1px solid var(--line-light);
  border-radius: var(--r-md);
  transition: border-color .2s var(--ease), background-color .2s var(--ease);
}

.page-about .about-node[open] {
  background: rgba(231, 214, 180, .6);
  border-color: rgba(30, 58, 110, .26);
}

.page-about .about-node > summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 14px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-node > summary::after {
  content: "展开";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--celadon-ink);
}

.page-about .about-node[open] > summary::after {
  content: "收起";
}

.page-about .about-node__year {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .04em;
  padding: 3px 10px;
  border-radius: var(--r-pill);
  background: var(--amber);
  color: var(--ink-900);
}

.page-about .about-node__title {
  font-size: 16px;
  font-weight: 700;
  color: var(--ink-900);
  letter-spacing: -.01em;
}

.page-about .about-node__body {
  padding: 0 16px 16px;
}

.page-about .about-node__body p {
  margin: 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--about-body-text);
}

/* ---------- Principles ---------- */
.page-about .about-principles {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-principle {
  position: relative;
  padding: 20px 20px 24px;
  border-radius: var(--r-md);
  border: 1px solid var(--line-light);
  background: rgba(255, 255, 255, .42);
}

.page-about .about-principle::after {
  content: "";
  position: absolute;
  left: 20px;
  bottom: 12px;
  width: 34px;
  height: 2px;
  border-radius: 2px;
  background: var(--celadon);
}

.page-about .about-principle__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .1em;
  color: var(--amber-ink);
}

.page-about .about-principle h3 {
  margin: 8px 0 8px;
  font-size: 19px;
  font-weight: 700;
  letter-spacing: -.012em;
  color: var(--ink-900);
}

.page-about .about-principle p {
  margin: 0;
  font-size: 15px;
  line-height: 1.76;
  color: var(--about-body-text);
}

/* ---------- Scenes ---------- */
.page-about .about-scenes {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-scenes li {
  padding: 12px 16px;
  border-left: 2px solid var(--celadon);
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
  background: rgba(95, 183, 163, .09);
  font-size: 15px;
  line-height: 1.7;
  color: var(--about-body-text);
}

.page-about .about-scenes strong {
  display: inline-block;
  min-width: 5em;
  margin-right: 6px;
  color: var(--ink-900);
  font-weight: 700;
}

/* ---------- FAQ ---------- */
.page-about .about-faqs {
  border-top: 1px solid var(--line-light);
}

.page-about .about-faq {
  border-bottom: 1px solid var(--line-light);
}

.page-about .about-faq > summary {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding: 16px 0;
  cursor: pointer;
  list-style: none;
  font-size: 16px;
  font-weight: 700;
  color: var(--ink-900);
  letter-spacing: -.008em;
}

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

.page-about .about-faq > summary::after {
  content: "+";
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 20px;
  line-height: 1;
  color: var(--celadon-ink);
  transition: transform .2s var(--ease);
}

.page-about .about-faq[open] > summary::after {
  content: "−";
}

.page-about .about-faq > summary:hover,
.page-about .about-faq > summary:focus-visible {
  color: var(--amber-ink);
}

.page-about .about-faq__body {
  padding: 0 0 18px;
}

.page-about .about-faq__body p {
  margin: 0;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-body-text);
}

/* ---------- Team ---------- */
.page-about .about-team {
  list-style: none;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-team li {
  padding: 20px;
  border-radius: var(--r-md);
  background: var(--ink-900);
  color: var(--paper);
  border: 1px solid var(--line-dark);
}

.page-about .about-team__name {
  display: inline-block;
  margin-bottom: 10px;
  padding: 3px 12px;
  border-radius: var(--r-pill);
  background: rgba(95, 183, 163, .18);
  border: 1px solid rgba(95, 183, 163, .4);
  color: var(--celadon);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .04em;
}

.page-about .about-team p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--mist);
}

/* ---------- Stats ---------- */
.page-about .about-stats {
  list-style: none;
  margin: 0 0 clamp(26px, 4vw, 40px);
  padding: clamp(22px, 3vw, 32px);
  border-radius: var(--r-lg);
  background: var(--ink-900);
  display: grid;
  gap: 22px;
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.01em;
  color: var(--amber);
}

.page-about .about-stat__label {
  display: block;
  margin-top: 8px;
  font-size: 14px;
  font-weight: 600;
  color: var(--paper);
}

.page-about .about-stat__desc {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.66;
  color: var(--mist);
}

/* ---------- Ecosystem ---------- */
.page-about .about-eco {
  display: grid;
  gap: clamp(22px, 3vw, 34px);
  align-items: center;
}

.page-about .about-ring {
  display: block;
  width: 100%;
  max-width: 220px;
  height: auto;
  margin: 0 auto;
}

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

.page-about .about-eco-item {
  position: relative;
  padding-left: 22px;
}

.page-about .about-eco-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.page-about .about-eco-item--a::before {
  background: var(--amber);
}

.page-about .about-eco-item--b::before {
  background: var(--celadon);
}

.page-about .about-eco-item--c::before {
  background: var(--ink-700);
}

.page-about .about-eco-item strong {
  display: block;
  margin-bottom: 5px;
  font-size: 16px;
  font-weight: 700;
  color: var(--ink-900);
  letter-spacing: -.01em;
}

.page-about .about-eco-item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--about-body-text);
}

/* ---------- Closing ---------- */
.page-about .about-close {
  margin-top: clamp(22px, 3vw, 32px);
  padding: clamp(24px, 3.6vw, 42px);
  border-radius: var(--r-lg);
  background: var(--ink-900);
  color: var(--paper);
  border: 1px solid var(--line-dark-strong);
}

.page-about .about-close__quote {
  margin: 0 0 20px;
  max-width: 52ch;
  font-size: clamp(16px, 1.8vw, 19px);
  line-height: 1.7;
  color: var(--paper);
  padding-left: 16px;
  border-left: 2px solid var(--amber);
}

.page-about .about-close .copy-chip {
  background: rgba(95, 183, 163, .16);
  border: 1px solid rgba(95, 183, 163, .45);
  color: var(--celadon);
  border-radius: var(--r-pill);
  padding: 8px 16px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: background-color .2s var(--ease), border-color .2s var(--ease);
}

.page-about .about-close .copy-chip:hover,
.page-about .about-close .copy-chip:focus-visible {
  background: rgba(95, 183, 163, .28);
  border-color: var(--celadon);
}

.page-about .about-close .copy-chip__hint {
  margin-left: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--amber);
}

.page-about .about-next {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-next a {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  padding: 13px 18px;
  border-radius: var(--r-pill);
  border: 1px solid var(--line-dark-strong);
  color: var(--paper);
  text-decoration: none;
  font-size: 14px;
  font-weight: 600;
  transition: background-color .2s var(--ease), border-color .2s var(--ease), color .2s var(--ease);
}

.page-about .about-next a:hover,
.page-about .about-next a:focus-visible {
  background: rgba(242, 181, 68, .16);
  border-color: var(--amber);
  color: var(--amber-bright);
}

/* ---------- Breakpoints ---------- */
@media (min-width: 640px) {
  .page-about .about-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 26px;
  }

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

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

@media (min-width: 760px) {
  .page-about .about-eco {
    grid-template-columns: 220px minmax(0, 1fr);
    gap: clamp(26px, 3.6vw, 40px);
  }

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

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

  .page-about .about-scenes li {
    display: flex;
    gap: 4px;
  }
}

@media (max-width: 639px) {
  .page-about .about-scenes strong {
    display: block;
    min-width: 0;
    margin: 0 0 2px;
  }

  .page-about .about-hero__meta {
    gap: 16px 28px;
  }

  .page-about .about-hero__meta-val {
    font-size: 17px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-toc a,
  .page-about .about-node,
  .page-about .about-faq > summary::after,
  .page-about .about-next a,
  .page-about .about-close .copy-chip {
    transition: none;
  }
}
<<<END>>>