.page-about {
  --about-line: rgba(14, 27, 54, .14);
  --about-shadow: 0 14px 32px -22px rgba(14, 27, 54, .65);
  background: var(--sky-paper);
  color: var(--sky-ink);
  font-family: var(--sky-font-body);
  line-height: 1.85;
  overflow-x: hidden;
}

.page-about p {
  margin: 0 0 1.05em;
  max-width: 68ch;
}

.page-about h2,
.page-about h3 {
  font-family: var(--sky-font-title);
  color: var(--sky-ink-blue);
  letter-spacing: .03em;
  margin: 0;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(20px, 3vw, 30px) 0 clamp(36px, 6vw, 76px);
  background:
    radial-gradient(72% 90% at 90% 6%, rgba(217, 164, 65, .22), transparent 62%),
    radial-gradient(64% 82% at 2% 94%, rgba(15, 158, 138, .13), transparent 66%),
    var(--sky-paper);
}

.page-about .about-hero .sky-crumbs {
  margin-bottom: clamp(22px, 4vw, 40px);
  font-family: var(--sky-font-mono);
  font-size: 12px;
  letter-spacing: .05em;
  color: var(--sky-mist);
}

.page-about .sky-crumbs__link {
  color: var(--sky-ink-blue);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color .18s var(--sky-ease), color .18s var(--sky-ease);
}

.page-about .sky-crumbs__link:hover,
.page-about .sky-crumbs__link:focus-visible {
  color: var(--sky-teal-deep);
  border-bottom-color: var(--sky-teal);
}

.page-about .sky-crumbs__sep {
  margin: 0 8px;
  color: var(--sky-gold);
}

.page-about .about-hero__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 5vw, 56px);
  align-items: center;
}

.page-about .about-hero__copy {
  min-width: 0;
}

.page-about .about-hero .sky-kicker {
  font-family: var(--sky-font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--sky-gold);
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 14px;
}

.page-about .about-hero .sky-kicker::before {
  content: "";
  width: 26px;
  height: 1px;
  background: var(--sky-gold);
}

.page-about .about-hero h1 {
  font-family: var(--sky-font-title);
  font-weight: 900;
  font-size: clamp(30px, 5.4vw, 46px);
  line-height: 1.24;
  letter-spacing: .04em;
  color: var(--sky-ink-blue);
  margin: 0 0 18px;
  max-width: 16ch;
}

.page-about .about-hero__lede {
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.9;
  color: var(--sky-ink);
  max-width: 38em;
  margin-bottom: 26px;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 30px;
}

.page-about .about-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 28px;
  list-style: none;
  margin: 0;
  padding: 18px 0 0;
  border-top: 1px solid var(--sky-line-gold);
}

.page-about .about-hero__facts li {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 92px;
}

.page-about .about-hero__num {
  font-family: var(--sky-font-mono);
  font-size: 24px;
  line-height: 1.2;
  color: var(--sky-ink-blue);
  letter-spacing: .02em;
}

.page-about .about-hero__cap {
  font-size: 12px;
  color: var(--sky-mist);
  letter-spacing: .04em;
}

.page-about .about-hero__figure {
  margin: 0;
  border-radius: calc(var(--sky-radius) + 8px);
  overflow: hidden;
  border: 1px solid var(--sky-line-gold);
  background: var(--sky-ink-blue);
  box-shadow: var(--about-shadow);
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  aspect-ratio: 14 / 9;
}

/* ---------- 主体骨架 ---------- */
.page-about .about-body {
  padding-bottom: clamp(40px, 7vw, 90px);
}

.page-about .sky-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 32px);
}

.page-about .about-flow {
  min-width: 0;
}

/* ---------- 左轨目录 ---------- */
.page-about .sky-rail {
  background: var(--sky-ink-blue);
  border-radius: var(--sky-radius);
  padding: 14px 12px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .sky-rail__head {
  margin: 0 0 8px 4px;
  font-family: var(--sky-font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--sky-gold);
}

.page-about .sky-rail__list {
  display: flex;
  flex-direction: row;
  gap: 6px;
  list-style: none;
  margin: 0;
  padding: 0;
  min-width: max-content;
}

.page-about .sky-rail__item {
  margin: 0;
}

.page-about .sky-rail__link {
  display: flex;
  align-items: center;
  gap: 9px;
  min-height: 44px;
  padding: 8px 12px;
  border-radius: 10px;
  border-left: 3px solid transparent;
  color: var(--sky-cream-text);
  text-decoration: none;
  font-size: 14px;
  white-space: nowrap;
  transition: background .18s var(--sky-ease), border-color .18s var(--sky-ease), color .18s var(--sky-ease);
}

.page-about .sky-rail__link:hover,
.page-about .sky-rail__link:focus-visible {
  background: var(--sky-blue-2);
  color: #fff;
}

.page-about .sky-rail__link.is-active,
.page-about .sky-rail__link[aria-current="true"] {
  background: var(--sky-blue-2);
  border-left-color: var(--sky-gold);
  color: #fff;
}

.page-about .sky-rail__link:focus-visible {
  outline: 2px solid var(--sky-teal);
  outline-offset: 2px;
}

.page-about .about-railnum {
  font-family: var(--sky-font-mono);
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--sky-gold);
}

/* ---------- 章节通用 ---------- */
.page-about .about-chapter {
  padding: clamp(30px, 5vw, 56px) 0;
  border-top: 1px solid var(--about-line);
}

.page-about .about-chapter:first-child {
  border-top: 0;
  padding-top: clamp(10px, 2vw, 20px);
}

.page-about .about-chapter__num {
  font-family: var(--sky-font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--sky-gold);
  margin: 0 0 10px;
}

.page-about .about-chapter h2 {
  font-size: clamp(24px, 3.4vw, 31px);
  line-height: 1.34;
  margin-bottom: 16px;
}

.page-about .about-chapter__lead {
  font-size: 16px;
  color: var(--sky-blue-2);
  border-left: 2px solid var(--sky-gold-soft);
  padding-left: 16px;
  margin-bottom: 24px;
  max-width: 52ch;
}

.page-about .about-chapter h3 {
  font-size: 18px;
  line-height: 1.5;
  margin-bottom: 10px;
}

.page-about .about-quote {
  margin-top: 26px;
  padding: 20px 22px;
  background: var(--sky-parchment);
  border-radius: var(--sky-radius);
  border-left: 4px solid var(--sky-rust);
  font-family: var(--sky-font-title);
  font-size: 17px;
  line-height: 1.8;
  color: var(--sky-ink-blue);
  max-width: 60ch;
}

/* ---------- 三支小组 ---------- */
.page-about .about-teams {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

.page-about .about-team {
  background: var(--sky-card);
  border: 1px solid var(--about-line);
  border-left: 4px solid var(--sky-gold);
  border-radius: var(--sky-radius);
  padding: 22px 20px;
  min-width: 0;
  transition: transform .18s var(--sky-ease), box-shadow .18s var(--sky-ease), border-color .18s var(--sky-ease);
}

.page-about .about-team:hover,
.page-about .about-team:focus-within {
  transform: translateY(-2px);
  box-shadow: var(--about-shadow);
  border-color: var(--sky-gold);
}

.page-about .about-team .sky-tag {
  display: inline-block;
  font-family: var(--sky-font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  padding: 4px 10px;
  border-radius: 999px;
  margin-bottom: 12px;
}

.page-about .about-team__num {
  font-family: var(--sky-font-mono);
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--sky-teal-deep);
  margin-bottom: 10px;
}

.page-about .about-team p {
  font-size: 15px;
  max-width: none;
}

.page-about .about-team__deliver {
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px dashed var(--sky-line-gold);
  font-size: 13px;
  line-height: 1.8;
  color: var(--sky-blue-2);
}

/* ---------- 内容四步 ---------- */
.page-about .about-chapter--band {
  background: var(--sky-parchment);
  border-radius: var(--sky-radius);
  padding: clamp(26px, 4vw, 46px) clamp(18px, 3vw, 36px);
  border-top: 0;
  margin: clamp(20px, 4vw, 40px) 0;
}

.page-about .about-steps {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  list-style: none;
  margin: 0 0 26px;
  padding: 0 0 0 18px;
  border-left: 2px solid var(--sky-gold-soft);
}

.page-about .about-step {
  position: relative;
  padding: 18px 4px 22px 8px;
  min-width: 0;
}

.page-about .about-step::before {
  content: "";
  position: absolute;
  left: -25px;
  top: 26px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--sky-gold);
  box-shadow: 0 0 0 4px var(--sky-parchment);
}

.page-about .about-step__num {
  display: block;
  font-family: var(--sky-font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--sky-mist);
  margin-bottom: 6px;
  transition: color .2s var(--sky-ease);
}

.page-about .about-step:hover .about-step__num {
  color: var(--sky-gold);
}

.page-about .about-step p {
  font-size: 14px;
  max-width: 34ch;
}

.page-about .about-step__gate {
  margin-top: 10px;
  padding: 8px 12px;
  background: rgba(255, 253, 248, .85);
  border-radius: 8px;
  font-size: 12.5px;
  line-height: 1.75;
  color: var(--sky-teal-deep);
}

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

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  aspect-ratio: 12 / 5;
  border-radius: var(--sky-radius);
  border: 1px solid var(--sky-line-gold);
}

.page-about .about-figure__cap {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.75;
  color: var(--sky-blue-2);
  max-width: 60ch;
}

/* ---------- 运营阶段时间线 ---------- */
.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 6px 0 0 30px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 12px;
  bottom: 18px;
  width: 1px;
  background: linear-gradient(180deg, var(--sky-gold), rgba(217, 164, 65, .12));
}

.page-about .about-timeline__item {
  position: relative;
  padding-bottom: 22px;
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -27px;
  top: 20px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--sky-gold);
  box-shadow: 0 0 0 4px var(--sky-paper);
  transition: transform .18s var(--sky-ease);
}

.page-about .about-timeline__item:hover::before {
  transform: scale(1.25);
}

.page-about .about-timeline__card {
  background: var(--sky-card);
  border: 1px solid var(--about-line);
  border-radius: var(--sky-radius);
  padding: 18px 18px 16px;
  transition: border-color .18s var(--sky-ease), box-shadow .18s var(--sky-ease);
}

.page-about .about-timeline__item:hover .about-timeline__card {
  border-color: var(--sky-line-gold);
  box-shadow: var(--about-shadow);
}

.page-about .about-timeline__phase {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin: 0 0 6px;
  font-family: var(--sky-font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--sky-rust);
}

.page-about .about-timeline__num {
  color: var(--sky-gold);
}

.page-about .about-timeline__card h3 {
  font-size: 17px;
  margin-bottom: 8px;
}

.page-about .about-timeline__card p {
  font-size: 14.5px;
  margin-bottom: 0;
  max-width: 56ch;
}

/* ---------- 技术与协作 ---------- */
.page-about .about-chapter--ink {
  background: var(--sky-ink-blue);
  border-radius: var(--sky-radius);
  padding: clamp(26px, 4vw, 48px) clamp(18px, 3vw, 40px);
  border-top: 0;
  color: var(--sky-cream-text);
  margin: clamp(20px, 4vw, 40px) 0;
}

.page-about .about-chapter--ink h2 {
  color: var(--sky-paper);
}

.page-about .about-chapter--ink .about-chapter__num {
  color: var(--sky-gold);
}

.page-about .about-chapter--ink .about-chapter__lead {
  color: var(--sky-gold-soft);
  border-left-color: rgba(217, 164, 65, .55);
}

.page-about .about-tech {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
  align-items: center;
}

.page-about .about-tech__list {
  list-style: none;
  margin: 0 0 22px;
  padding: 0;
}

.page-about .about-tech__list li {
  position: relative;
  padding: 0 0 14px 18px;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--sky-cream-text);
}

.page-about .about-tech__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--sky-teal);
}

.page-about .about-tech__list strong {
  display: block;
  font-family: var(--sky-font-title);
  font-size: 15px;
  letter-spacing: .05em;
  color: var(--sky-gold-soft);
  margin-bottom: 2px;
}

.page-about .about-tech__btn {
  margin-top: 4px;
}

.page-about .about-tech__figure {
  margin: 0;
  border-radius: var(--sky-radius);
  overflow: hidden;
  border: 1px solid rgba(217, 164, 65, .35);
}

.page-about .about-tech__figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  aspect-ratio: 10 / 7;
}

/* ---------- 视觉语言 ---------- */
.page-about .about-visual {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  margin-bottom: 22px;
}

.page-about .about-visual__item {
  background: var(--sky-card);
  border: 1px solid var(--about-line);
  border-radius: var(--sky-radius);
  padding: 20px 18px;
  min-width: 0;
  transition: transform .18s var(--sky-ease), border-color .18s var(--sky-ease);
}

.page-about .about-visual__item:hover {
  transform: translateY(-2px);
  border-color: var(--sky-gold);
}

.page-about .about-visual__swatch {
  display: block;
  width: 46px;
  height: 46px;
  border-radius: 50% 50% 50% 12px;
  margin-bottom: 14px;
}

.page-about .about-visual__swatch--ink {
  background: var(--sky-ink-blue);
}

.page-about .about-visual__swatch--gold {
  background: linear-gradient(135deg, var(--sky-gold), var(--sky-gold-soft));
}

.page-about .about-visual__swatch--teal {
  background: linear-gradient(135deg, var(--sky-teal), var(--sky-teal-deep));
}

.page-about .about-visual__item h3 {
  font-size: 16px;
  margin-bottom: 8px;
}

.page-about .about-visual__item p {
  font-size: 14px;
  margin-bottom: 0;
  max-width: none;
}

.page-about .about-visual__note {
  font-size: 14px;
  color: var(--sky-blue-2);
  border-top: 1px solid var(--sky-line-gold);
  padding-top: 18px;
  max-width: 62ch;
}

/* ---------- 延伸入口 ---------- */
.page-about .about-next {
  margin-top: clamp(28px, 5vw, 52px);
  padding-top: clamp(26px, 4vw, 40px);
  border-top: 1px solid var(--about-line);
}

.page-about .about-next h2 {
  font-size: clamp(20px, 2.6vw, 24px);
  margin-bottom: 18px;
}

.page-about .about-next__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .about-next__link {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 16px 18px;
  min-height: 48px;
  border: 1px solid var(--about-line);
  border-radius: var(--sky-radius);
  background: var(--sky-card);
  text-decoration: none;
  transition: transform .18s var(--sky-ease), border-color .18s var(--sky-ease), box-shadow .18s var(--sky-ease);
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  transform: translateY(-2px);
  border-color: var(--sky-teal);
  box-shadow: var(--about-shadow);
}

.page-about .about-next__link:focus-visible {
  outline: 2px solid var(--sky-teal);
  outline-offset: 2px;
}

.page-about .about-next__label {
  font-family: var(--sky-font-title);
  font-size: 16px;
  letter-spacing: .05em;
  color: var(--sky-ink-blue);
  border-bottom: 1px solid transparent;
  align-self: flex-start;
  transition: border-color .18s var(--sky-ease), color .18s var(--sky-ease);
}

.page-about .about-next__link:hover .about-next__label,
.page-about .about-next__link:focus-visible .about-next__label {
  color: var(--sky-teal-deep);
  border-bottom-color: var(--sky-teal);
}

.page-about .about-next__desc {
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--sky-mist);
}

/* ---------- 媒体查询 ---------- */
@media (min-width: 720px) {
  .page-about .about-teams {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

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

@media (min-width: 820px) {
  .page-about .about-steps {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    padding-left: 0;
    border-left: 0;
    border-top: 2px solid var(--sky-gold-soft);
  }

  .page-about .about-step {
    padding: 26px 16px 20px 18px;
    border-right: 1px solid var(--about-line);
  }

  .page-about .about-step:last-child {
    border-right: 0;
    padding-right: 4px;
  }

  .page-about .about-step::before {
    left: 18px;
    top: -8px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 47fr) minmax(0, 53fr);
  }

  .page-about .sky-layout {
    grid-template-columns: var(--sky-rail) minmax(0, 1fr);
    gap: clamp(32px, 4vw, 56px);
    align-items: start;
  }

  .page-about .sky-rail {
    position: sticky;
    top: 24px;
    overflow: visible;
    padding: 18px 14px;
  }

  .page-about .sky-rail__list {
    flex-direction: column;
    min-width: 0;
    gap: 4px;
  }

  .page-about .sky-rail__link {
    white-space: normal;
    font-size: 13.5px;
  }

  .page-about .about-tech {
    grid-template-columns: minmax(0, 54fr) minmax(0, 46fr);
    gap: clamp(28px, 4vw, 46px);
  }

  .page-about .about-next__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition: none !important;
    transform: none !important;
  }
}
<<<END>>>