.page-about {
  --about-line: rgba(242,238,223,.16);
  --about-soft: rgba(242,238,223,.74);
  --about-pad: clamp(16px,4vw,30px);
  background: var(--night);
  color: var(--bone);
  font-family: var(--sans);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: clamp(18px,4vw,32px) 0 clamp(34px,6vw,68px);
  border-bottom: var(--bw) solid var(--about-line);
}
.page-about .about-hero__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .3;
  filter: saturate(.72);
  z-index: -2;
}
.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(120% 90% at 80% 6%, rgba(200,255,61,.18), transparent 62%),
    linear-gradient(180deg, rgba(3,10,8,.42) 0%, rgba(7,26,20,.86) 62%, var(--night) 95%);
}
.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -8%;
  top: 14%;
  width: 46%;
  height: 72%;
  z-index: -1;
  background: linear-gradient(160deg, rgba(184,106,74,.42), rgba(78,107,82,.12));
  clip-path: polygon(18% 0, 100% 0, 82% 100%, 0 100%);
  opacity: .55;
  pointer-events: none;
}
.page-about .about-hero__inner { position: relative; }

.page-about .breadcrumb {
  margin: 0 0 clamp(18px,4vw,34px);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--rock);
}
.page-about .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about .breadcrumb__list li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--moss);
}
.page-about .breadcrumb a {
  color: var(--bone);
  text-decoration: none;
  border-bottom: 1px solid var(--moss);
}
.page-about .breadcrumb a:hover { border-bottom-color: var(--lime); }

.page-about .eyebrow {
  display: inline-block;
  margin: 0 0 14px;
  padding: 5px 12px;
  font-size: 11px;
  font-weight: 700;
  font-style: italic;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--night);
  background: var(--lime);
  clip-path: polygon(0 0, 100% 0, 94% 100%, 0 100%);
}
.page-about .about-hero__title {
  margin: 0;
  max-width: 20ch;
  font-family: var(--serif);
  font-weight: 700;
  font-size: clamp(28px,6vw,56px);
  line-height: 1.14;
  letter-spacing: .01em;
  text-wrap: balance;
}
.page-about .about-hero__lead {
  margin: clamp(16px,3vw,24px) 0 0;
  max-width: 54ch;
  font-size: clamp(15px,2.2vw,17px);
  line-height: 1.72;
  color: var(--about-soft);
}

.page-about .fact-strip {
  list-style: none;
  margin: clamp(24px,4vw,40px) 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
  grid-template-columns: 1fr;
}
.page-about .fact-strip__item {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding-left: 14px;
  border-left: 3px solid var(--lime);
}
.page-about .fact-strip__value {
  font-size: clamp(22px,3.4vw,30px);
  line-height: 1;
  color: var(--lime);
  font-weight: 700;
}
.page-about .fact-strip__label {
  font-size: 13px;
  line-height: 1.5;
  color: var(--about-soft);
}

/* ---------- 正文双栏 ---------- */
.page-about .about-body {
  display: grid;
  gap: clamp(28px,5vw,52px);
  padding-top: clamp(34px,6vw,72px);
  padding-bottom: clamp(40px,7vw,88px);
}

.page-about .about-index {
  border-top: var(--bw) solid var(--about-line);
  padding-top: 14px;
}
.page-about .about-index__label {
  margin: 0 0 12px;
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--rock);
}
.page-about .about-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.page-about .about-index__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 12px;
  font-size: 13px;
  font-weight: 600;
  color: var(--bone);
  text-decoration: none;
  border: var(--bw) solid var(--about-line);
  background: var(--night-2);
  transition: border-color .16s ease, color .16s ease;
}
.page-about .about-index__num { font-size: 11px; color: var(--lime); }
.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  border-color: var(--lime);
  color: var(--lime);
  outline: none;
}

.page-about .about-chapters {
  display: grid;
  gap: clamp(30px,5vw,56px);
  min-width: 0;
}

.page-about .chapter {
  min-width: 0;
  border-top: var(--bw) solid var(--about-line);
  padding-top: clamp(20px,3vw,30px);
}
.page-about .chapter:first-child { border-top: 0; padding-top: 0; }
.page-about .chapter--eco { border-top: 0; padding-top: 0; }

.page-about .chapter__head { margin-bottom: clamp(14px,2.6vw,22px); }
.page-about .chapter__kicker {
  margin: 0 0 8px;
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--clay);
}
.page-about .chapter__title {
  margin: 0;
  font-family: var(--serif);
  font-weight: 700;
  font-size: clamp(21px,3.4vw,32px);
  line-height: 1.32;
  color: var(--bone);
}
.page-about .chapter__text p {
  margin: 0 0 14px;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--about-soft);
}
.page-about .chapter__text p:last-child { margin-bottom: 0; }
.page-about .chapter__text a,
.page-about .chapter__tail a {
  color: var(--lime);
  text-decoration: none;
  border-bottom: 1px solid var(--moss);
}
.page-about .chapter__text a:hover,
.page-about .chapter__tail a:hover { border-bottom-color: var(--lime); }
.page-about .chapter__tail {
  margin: clamp(16px,3vw,22px) 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--about-soft);
}

/* ---------- 里程碑坐标 ---------- */
.page-about .milestones {
  list-style: none;
  margin: clamp(20px,3vw,30px) 0 0;
  padding: 0 0 0 clamp(18px,3vw,26px);
  border-left: 2px dashed var(--moss);
}
.page-about .milestone {
  position: relative;
  padding-bottom: clamp(16px,2.6vw,24px);
}
.page-about .milestone:last-child { padding-bottom: 0; }
.page-about .milestone::before {
  content: "";
  position: absolute;
  left: calc(-1 * clamp(18px,3vw,26px) - 8px);
  top: 4px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--night);
  border: 2px solid var(--lime);
}
.page-about .milestone__coord {
  display: block;
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--lime);
}
.page-about .milestone__title {
  margin: 5px 0 5px;
  font-size: 16px;
  font-weight: 700;
  color: var(--bone);
}
.page-about .milestone__text {
  margin: 0;
  max-width: 58ch;
  font-size: 14px;
  line-height: 1.7;
  color: var(--about-soft);
}

/* ---------- 设计取舍 ---------- */
.page-about .principles {
  display: grid;
  gap: 14px;
  margin-top: clamp(18px,3vw,26px);
}
.page-about .principle {
  padding: 16px 18px;
  background: var(--night-2);
  border: var(--bw) solid var(--moss);
  box-shadow: 6px 6px 0 var(--ink);
}
.page-about .principle__title {
  margin: 0 0 8px;
  font-size: 15px;
  font-weight: 700;
  color: var(--lime);
  letter-spacing: .02em;
}
.page-about .principle__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--about-soft);
}

.page-about .mobile-stats {
  display: grid;
  gap: 14px;
  margin-top: clamp(20px,3vw,28px);
  padding: clamp(16px,3vw,24px);
  border: var(--bw) solid var(--glass);
  background:
    linear-gradient(135deg, rgba(78,107,82,.45), rgba(14,42,33,.92) 70%),
    var(--night-2);
}
.page-about .stat { display: flex; align-items: baseline; gap: 10px; }
.page-about .stat__num {
  font-size: clamp(24px,4vw,34px);
  font-weight: 700;
  line-height: 1;
  color: var(--glass);
  letter-spacing: -.01em;
}
.page-about .stat__text {
  font-size: 13px;
  line-height: 1.5;
  color: var(--about-soft);
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  gap: clamp(18px,3vw,28px);
}
.page-about .about-team__figure { margin: 0; }
.page-about .media-frame__img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: var(--bw) solid var(--moss);
}
.page-about .media-frame__cap {
  margin-top: 8px;
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--rock);
}
.page-about .roles {
  display: grid;
  gap: 12px;
  margin-top: clamp(18px,3vw,26px);
}
.page-about .role {
  padding-top: 10px;
  border-top: 2px solid var(--about-line);
}
.page-about .role__title {
  margin: 0 0 5px;
  font-size: 14px;
  font-weight: 700;
  color: var(--clay);
  letter-spacing: .04em;
}
.page-about .role__text {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--about-soft);
}

/* ---------- 合作生态 ---------- */
.page-about .eco {
  position: relative;
  overflow: hidden;
  padding: clamp(18px,4vw,34px);
  border: var(--bw) solid var(--clay);
  background: var(--night-2);
}
.page-about .eco__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .24;
  z-index: 0;
}
.page-about .eco__inner { position: relative; z-index: 1; }
.page-about .eco__lead {
  margin: 0 0 clamp(14px,2.6vw,20px);
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--about-soft);
}
.page-about .eco-list { border-top: var(--bw) solid var(--about-line); }
.page-about .eco-item { border-bottom: var(--bw) solid var(--about-line); }
.page-about .eco-item__summary {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 0;
  cursor: pointer;
  list-style: none;
  font-size: 15px;
  font-weight: 700;
  color: var(--bone);
}
.page-about .eco-item__summary::-webkit-details-marker { display: none; }
.page-about .eco-item__summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--mono);
  font-size: 18px;
  line-height: 1;
  color: var(--lime);
}
.page-about .eco-item[open] .eco-item__summary::after { content: "–"; }
.page-about .eco-item__tag {
  padding: 3px 9px;
  font-size: 11px;
  font-style: italic;
  letter-spacing: .1em;
  color: var(--night);
  background: var(--moss);
  color: var(--bone);
}
.page-about .eco-item__body { padding: 0 0 16px; }
.page-about .eco-item__body p {
  margin: 0;
  max-width: 60ch;
  font-size: 14px;
  line-height: 1.75;
  color: var(--about-soft);
}
.page-about .eco-recogn {
  margin: clamp(16px,3vw,22px) 0 0;
  padding-left: 14px;
  border-left: 3px solid var(--lime);
  font-size: 14px;
  line-height: 1.72;
  color: var(--bone);
}

/* ---------- 版本索引带 ---------- */
.page-about .version-band {
  display: flex;
  gap: 14px;
  margin-top: clamp(18px,3vw,26px);
  padding: 4px 4px 18px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
}
.page-about .version-band:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 4px;
}
.page-about .version-card {
  flex: 0 0 min(250px,76vw);
  scroll-snap-align: start;
  padding: 16px;
  background: var(--night-2);
  border: var(--bw) solid var(--about-line);
  box-shadow: 6px 6px 0 var(--ink);
}
.page-about .version-card--now { border-color: var(--lime); }
.page-about .version-card__ver {
  display: flex;
  align-items: center;
  gap: 7px;
  margin: 0 0 10px;
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--rock);
}
.page-about .version-card--now .version-card__ver { color: var(--lime); }
.page-about .version-card__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--lime);
  box-shadow: 0 0 0 3px rgba(200,255,61,.22);
}
.page-about .version-card__title {
  margin: 0 0 8px;
  font-size: 15px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--bone);
}
.page-about .version-card__text {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.68;
  color: var(--about-soft);
}

/* ---------- 联系 ---------- */
.page-about .reach-grid {
  display: grid;
  gap: 14px;
}
.page-about .reach-card {
  padding: clamp(16px,3vw,22px);
  background: var(--night-2);
  border: var(--bw) solid var(--about-line);
  box-shadow: 8px 8px 0 var(--ink);
}
.page-about .reach-card__title {
  margin: 0 0 8px;
  font-family: var(--serif);
  font-size: 18px;
  font-weight: 700;
  color: var(--bone);
}
.page-about .reach-card__text {
  margin: 0 0 16px;
  font-size: 14px;
  line-height: 1.72;
  color: var(--about-soft);
}
.page-about .contact-list {
  list-style: none;
  margin: clamp(18px,3vw,26px) 0 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: var(--bw) solid var(--about-line);
}
.page-about .contact-row {
  display: grid;
  gap: 3px;
  padding: 12px 0;
  border-bottom: 2px solid var(--about-line);
}
.page-about .contact-row__label {
  font-size: 11px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--rock);
}
.page-about .contact-row__value {
  font-size: 15px;
  color: var(--bone);
  word-break: break-word;
}
.page-about .about-note {
  margin: 14px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--rock);
}

/* ---------- 断点 ---------- */
@media (min-width: 600px) {
  .page-about .fact-strip { grid-template-columns: repeat(3, minmax(0,1fr)); gap: 0; }
  .page-about .fact-strip__item + .fact-strip__item { border-left-color: var(--about-line); }
  .page-about .fact-strip__item { padding-right: 14px; }
  .page-about .roles { grid-template-columns: repeat(2, minmax(0,1fr)); gap: 14px 20px; }
  .page-about .reach-grid { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .page-about .stat { gap: 12px; }
}

@media (min-width: 760px) {
  .page-about .principles { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .page-about .principle--wide { grid-column: 1 / -1; }
  .page-about .mobile-stats { grid-template-columns: repeat(2, minmax(0,1fr)); gap: 20px; }
  .page-about .contact-row { grid-template-columns: 140px minmax(0,1fr); align-items: baseline; }
}

@media (min-width: 900px) {
  .page-about .about-body {
    grid-template-columns: minmax(150px, 186px) minmax(0, 1fr);
    gap: clamp(30px,4vw,64px);
    align-items: start;
  }
  .page-about .about-index {
    position: sticky;
    top: 84px;
    border-top: 0;
    padding-top: 0;
    padding-left: 18px;
    border-left: var(--bw) solid var(--moss);
  }
  .page-about .about-index__list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 6px;
  }
  .page-about .about-index__link {
    border-color: transparent;
    background: transparent;
    padding: 6px 0;
    font-size: 13.5px;
    color: var(--about-soft);
  }
  .page-about .about-index__link:hover,
  .page-about .about-index__link:focus-visible { color: var(--lime); }
  .page-about .team-grid { grid-template-columns: minmax(0,1.1fr) minmax(0,.9fr); }
  .page-about .milestones { padding-left: 30px; }
  .page-about .milestone::before { left: -38px; }
}

@media (min-width: 1160px) {
  .page-about .about-hero__inner { display: grid; grid-template-columns: minmax(0,1fr); }
  .page-about .eco { padding: clamp(26px,3vw,40px); }
  .page-about .version-card { flex-basis: 268px; }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-index__link,
  .page-about .version-band { transition: none; scroll-behavior: auto; }
}
<<<END>>>