.page-about {
  --about-rail: 224px;
  --about-soft: rgba(241, 230, 210, .78);
  --about-soft-2: rgba(169, 194, 182, .9);
}

/* ---------- 首屏框景 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(18px, 3.6vw, 40px) 0 clamp(30px, 5.6vw, 64px);
  border-bottom: 1px solid var(--line-22);
}
.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(58% 66% at 82% 6%, rgba(33, 246, 207, .12), transparent 66%),
    linear-gradient(180deg, rgba(11, 58, 48, .58), transparent 72%);
  pointer-events: none;
}
.page-about .about-hero__grid {
  position: relative;
  display: grid;
  gap: clamp(22px, 4vw, 40px);
  align-items: start;
}
.page-about .about-hero h1 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(2.5rem, 8.4vw, 5rem);
  line-height: .98;
  letter-spacing: -.01em;
  color: var(--paper-hi);
  max-width: 16ch;
}
.page-about .about-hero__lede {
  margin: 20px 0 0;
  max-width: 44ch;
  font-size: clamp(1rem, 1.7vw, 1.1rem);
  line-height: 1.85;
  color: var(--about-soft);
}
.page-about .about-hero__facts {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 14px 26px;
  margin: 26px 0 0;
  padding: 16px 0 0;
  border-top: 1px solid var(--line-22);
}
.page-about .about-hero__facts li {
  display: flex;
  align-items: baseline;
  gap: 8px;
}
.page-about .about-hero__num {
  font-family: var(--font-mono);
  font-size: clamp(1.25rem, 3vw, 1.7rem);
  color: var(--neon);
  line-height: 1;
}
.page-about .about-hero__lab {
  font-size: .78rem;
  letter-spacing: .06em;
  color: var(--about-soft-2);
}
.page-about .about-hero__figure { margin: 0; }

/* ---------- 图文通用 ---------- */
.page-about .media { margin: 0; }
.page-about .media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .about-figure { margin: 26px 0 6px; }
.page-about .media__caption {
  font-size: .78rem;
  line-height: 1.6;
}

/* ---------- 主体双栏 ---------- */
.page-about .about-body {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
  padding-top: clamp(26px, 4.6vw, 56px);
}
.page-about .about-rail {
  border-top: 1px solid var(--line-35);
  padding-top: 14px;
}
.page-about .about-rail__title,
.page-about .about-rail__sub {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .2em;
  color: var(--neon);
}
.page-about .about-rail__list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 6px 18px;
  margin: 0 0 18px;
  padding: 0;
}
.page-about .about-rail__list a {
  font-family: var(--font-mono);
  font-size: .76rem;
  letter-spacing: .04em;
  color: var(--about-soft);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
  transition: color 180ms var(--ease), border-color 180ms var(--ease);
}
.page-about .about-rail__list a:hover,
.page-about .about-rail__list a:focus-visible {
  color: var(--neon);
  border-bottom-color: var(--neon);
}
.page-about .about-rail__note {
  border-top: 1px dashed var(--line-22);
  padding-top: 14px;
}
.page-about .about-rail__mini {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 6px;
}
.page-about .about-rail__mini li {
  font-family: var(--font-mono);
  font-size: .72rem;
  line-height: 1.6;
  color: var(--mist);
}

/* ---------- 章节 ---------- */
.page-about .about-content > section {
  padding-block: clamp(24px, 4.4vw, 48px);
}
.page-about .about-content > section:first-child { padding-top: 0; }
.page-about .about-content > section + section {
  border-top: 1px solid var(--line-18);
}
.page-about .about-h2 {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 12px;
  margin: 0 0 .7em;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.6rem, 3.6vw, 2.3rem);
  line-height: 1.16;
  letter-spacing: .01em;
  color: var(--paper-hi);
}
.page-about .about-h2__idx {
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .2em;
  color: var(--neon);
}
.page-about .about-content p {
  margin: 0 0 1em;
  font-size: clamp(.98rem, 1.35vw, 1.06rem);
  line-height: 1.92;
  color: var(--about-soft);
  max-width: 62ch;
}
.page-about .about-content p:last-child { margin-bottom: 0; }

.page-about .about-quote {
  margin: 26px 0 0;
  padding: 14px 0 14px 20px;
  border-left: 2px solid var(--ember);
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(1.15rem, 2.4vw, 1.55rem);
  line-height: 1.5;
  color: var(--paper-hi);
}
.page-about .about-quote__src {
  display: block;
  margin-top: 10px;
  font-family: var(--font-mono);
  font-style: normal;
  font-size: .72rem;
  letter-spacing: .14em;
  color: var(--mist);
}

/* ---------- 索引面板 ---------- */
.page-about .about-index {
  margin: 24px 0 0;
  padding: 18px 20px 20px;
  background: rgba(11, 58, 48, .55);
  border: 1px solid var(--line-22);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%);
  display: grid;
  gap: 12px;
}
.page-about .about-index__row { display: grid; gap: 4px; }
.page-about .about-index__row + .about-index__row {
  border-top: 1px solid var(--line-18);
  padding-top: 12px;
}
.page-about .about-index dt {
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .16em;
  color: var(--neon);
}
.page-about .about-index dd {
  margin: 0;
  font-size: .92rem;
  line-height: 1.75;
  color: var(--about-soft);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline__track {
  list-style: none;
  margin: 22px 0 0;
  padding: 0 0 10px;
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(230px, 80%);
  gap: 12px;
  overflow-x: auto;
  scroll-snap-type: x proximity;
}
.page-about .about-timeline__item {
  position: relative;
  scroll-snap-align: start;
  padding: 14px 16px 16px;
  background: linear-gradient(152deg, rgba(11, 58, 48, .92), rgba(6, 31, 25, .94));
  border: 1px solid var(--line-22);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%);
  transition: border-color 180ms var(--ease), transform 180ms var(--ease);
}
.page-about .about-timeline__item:hover,
.page-about .about-timeline__item:focus-within {
  border-color: var(--neon);
  transform: translateY(-2px);
}
.page-about .about-timeline__season {
  display: block;
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .12em;
  color: var(--ember);
}
.page-about .about-timeline__dot {
  display: block;
  width: 34px;
  height: 2px;
  margin: 10px 0 12px;
  background: var(--neon);
  transform: skewX(-24deg);
}
.page-about .about-timeline__text {
  margin: 0;
  font-size: .9rem;
  line-height: 1.78;
  color: var(--about-soft);
  max-width: none;
}
.page-about .about-timeline__note {
  display: block;
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .08em;
  color: var(--mist);
}

/* ---------- 协作 ---------- */
.page-about .about-collab {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 16px 34px;
  margin: 24px 0 0;
  padding: 18px 0 0;
  border-top: 1px solid var(--line-22);
}
.page-about .about-collab li { display: flex; align-items: baseline; gap: 8px; }
.page-about .about-collab__num {
  font-family: var(--font-mono);
  font-size: clamp(1.3rem, 3vw, 1.7rem);
  color: var(--teal);
  line-height: 1;
}
.page-about .about-collab__lab {
  font-size: .8rem;
  color: var(--about-soft-2);
}
.page-about .about-more { margin-top: 22px; }
.page-about .about-inline-link {
  color: var(--neon);
  text-decoration: none;
  border-bottom: 1px solid rgba(33, 246, 207, .45);
  transition: border-color 180ms var(--ease), color 180ms var(--ease);
}
.page-about .about-inline-link:hover,
.page-about .about-inline-link:focus-visible {
  color: var(--paper-hi);
  border-bottom-color: var(--paper-hi);
}

/* ---------- 纸面运营段落 ---------- */
.page-about .about-ops {
  margin-top: clamp(24px, 4.4vw, 48px);
  padding: clamp(22px, 4vw, 38px);
  background: var(--paper);
  border-left: 3px solid var(--ember);
  border-top: 0;
}
.page-about .about-ops .about-h2 { color: var(--ink); }
.page-about .about-ops .about-h2__idx { color: var(--teal); }
.page-about .about-ops p { color: var(--ink-mid); }
.page-about .about-ops .media__caption { color: var(--ink-mid); }
.page-about .about-contact {
  display: grid;
  gap: 12px;
  margin: 22px 0 0;
  padding-top: 18px;
  border-top: 1px solid rgba(11, 58, 48, .25);
}
.page-about .about-contact__row {
  display: grid;
  gap: 3px;
}
.page-about .about-contact dt {
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .16em;
  color: var(--teal);
}
.page-about .about-contact dd {
  margin: 0;
  font-size: .98rem;
  line-height: 1.6;
  color: var(--ink);
  word-break: break-word;
}
.page-about .about-contact a {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-color: rgba(12, 138, 118, .6);
  text-underline-offset: 3px;
}

/* ---------- 反馈三步 ---------- */
.page-about .about-steps {
  list-style: none;
  counter-reset: about-step;
  margin: 18px 0 0;
  padding: 0;
}
.page-about .about-steps li {
  position: relative;
  counter-increment: about-step;
  padding: 16px 0 16px 48px;
  border-top: 1px solid var(--line-22);
}
.page-about .about-steps li::before {
  content: counter(about-step, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 18px;
  font-family: var(--font-mono);
  font-size: .8rem;
  letter-spacing: .1em;
  color: var(--ember);
}
.page-about .about-steps strong {
  display: block;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.05rem;
  letter-spacing: .04em;
  color: var(--paper-hi);
  margin-bottom: 4px;
}
.page-about .about-steps span {
  display: block;
  font-size: .94rem;
  line-height: 1.78;
  color: var(--about-soft);
  max-width: 56ch;
}

/* ---------- 行动区 ---------- */
.page-about .about-cta {
  margin-top: clamp(24px, 4vw, 40px);
  padding: clamp(20px, 3.6vw, 32px);
  background:
    linear-gradient(140deg, rgba(33, 246, 207, .09), rgba(255, 138, 61, .07)),
    rgba(2, 11, 9, .55);
  border: 1px solid var(--line-35);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%);
}
.page-about .about-cta__text {
  margin: 0 0 16px;
  font-size: .98rem;
  line-height: 1.8;
  color: var(--paper-hi);
  max-width: 46ch;
}
.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 断点 ---------- */
@media (min-width: 720px) {
  .page-about .about-index { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px 26px; }
  .page-about .about-index__row + .about-index__row {
    border-top: 0;
    padding-top: 0;
  }
  .page-about .about-contact { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px 28px; }
}

@media (min-width: 920px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(28px, 4vw, 56px);
  }
  .page-about .about-hero__figure { margin-top: 28px; }

  .page-about .about-body {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(28px, 4vw, 60px);
    align-items: start;
  }
  .page-about .about-rail {
    position: sticky;
    top: 96px;
    align-self: start;
    border-top: 0;
    border-left: 1px solid var(--line-35);
    padding: 4px 0 0 18px;
  }
  .page-about .about-rail__list {
    display: grid;
    gap: 8px;
    margin-bottom: 26px;
  }

  .page-about .about-timeline__track {
    grid-auto-flow: row;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    overflow: visible;
    padding-bottom: 0;
  }
  .page-about .about-timeline__item:nth-child(even) { margin-top: 26px; }
  .page-about .about-steps li { padding-left: 64px; }
}

@media (min-width: 1180px) {
  .page-about .about-hero h1 { max-width: 13ch; }
  .page-about .about-content p { max-width: 64ch; }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-timeline__item { transition: none; }
}
<<<PAGE_CSS_END>>>