.page-about {
  background: var(--deep-sea);
  color: var(--ice);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(20px, 4vw, 36px) 0 clamp(32px, 5vw, 56px);
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, var(--midnight) 0%, var(--deep-sea) 100%);
}

.page-about .about-hero__media {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.page-about .about-hero__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.26;
  max-width: 100%;
}

.page-about .about-hero__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    repeating-linear-gradient(0deg, rgba(30, 58, 82, 0.55) 0 1px, transparent 1px 56px),
    repeating-linear-gradient(90deg, rgba(30, 58, 82, 0.55) 0 1px, transparent 1px 56px),
    linear-gradient(180deg, rgba(10, 39, 66, 0.72) 0%, rgba(4, 24, 38, 0.94) 74%, var(--deep-sea) 100%);
}

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

.page-about .trail {
  margin-bottom: clamp(20px, 4vw, 40px);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
  grid-template-columns: minmax(0, 1fr);
}

.page-about .about-hero__main h1 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.9rem, 6.4vw, 3.5rem);
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin: 10px 0 0;
  max-width: 18ch;
}

.page-about .about-hero__main .lead {
  margin-top: 18px;
  max-width: 60ch;
  color: var(--ice);
  opacity: 0.88;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

/* 章节索引面板 */
.page-about .about-hero__panel {
  background: rgba(10, 39, 66, 0.82);
  border: 1px solid var(--line);
  border-top: 2px solid var(--electric);
  padding: 18px 18px 16px;
  align-self: start;
}

.page-about .about-hero__panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-hero__panel-head h2 {
  font-family: var(--font-body);
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--steel);
  margin: 0;
}

.page-about .about-index {
  list-style: none;
  margin: 6px 0 0;
  padding: 0;
}

.page-about .about-index__item + .about-index__item {
  border-top: 1px solid var(--line-soft);
}

.page-about .about-index__link {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 11px 4px;
  color: var(--ice);
  text-decoration: none;
  font-size: 0.95rem;
  transition: color var(--t-fast) var(--ease), background-color var(--t-fast) var(--ease);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--electric);
  background: rgba(53, 224, 242, 0.07);
}

.page-about .about-index__num {
  color: var(--gold);
  font-size: 0.78rem;
  flex: 0 0 auto;
}

.page-about .about-hero__panel-note {
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--line-soft);
  font-size: 0.82rem;
  color: var(--steel);
  line-height: 1.65;
}

/* 首屏数据条 */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(28px, 5vw, 52px) 0 0;
  padding: 0;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .about-stats__cell {
  background: rgba(4, 24, 38, 0.88);
  padding: 14px 14px 16px;
  margin: 0;
}

.page-about .about-stats dt {
  font-size: 0.76rem;
  letter-spacing: 0.12em;
  color: var(--steel);
  margin-bottom: 8px;
}

.page-about .about-stats dd {
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: 6px;
}

.page-about .about-stats__num {
  font-family: var(--font-data);
  font-weight: 700;
  font-size: clamp(1.6rem, 5vw, 2.2rem);
  color: var(--electric);
  line-height: 1;
}

.page-about .about-stats__unit {
  font-size: 0.8rem;
  color: var(--steel);
}

/* ---------- 吸顶章节导航 ---------- */
.page-about .about-chapters {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(4, 24, 38, 0.94);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(10px);
}

.page-about .about-chapters__inner {
  display: flex;
  align-items: center;
  gap: 6px;
  overflow-x: auto;
  scrollbar-width: none;
  padding-top: 10px;
  padding-bottom: 10px;
}

.page-about .about-chapters__inner::-webkit-scrollbar {
  display: none;
}

.page-about .about-chapters__link {
  flex: 0 0 auto;
  padding: 7px 12px;
  font-size: 0.85rem;
  color: var(--steel);
  text-decoration: none;
  border: 1px solid transparent;
  transition: color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}

.page-about .about-chapters__link:hover,
.page-about .about-chapters__link:focus-visible {
  color: var(--electric);
  border-color: var(--line-accent);
}

.page-about .about-chapters__cta {
  flex: 0 0 auto;
  margin-left: auto;
  padding: 7px 14px;
  font-size: 0.85rem;
  color: var(--deep-sea);
  background: var(--gold);
  text-decoration: none;
  font-weight: 600;
}

.page-about .about-chapters__cta:hover,
.page-about .about-chapters__cta:focus-visible {
  background: var(--ice);
}

/* ---------- 通用章节 ---------- */
.page-about .about-section {
  padding: clamp(40px, 7vw, 84px) 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-head {
  max-width: 68ch;
  margin-bottom: clamp(24px, 4vw, 44px);
}

.page-about .about-head h2,
.page-about .about-route__text h2,
.page-about .about-eco__main h2,
.page-about .about-cta__text h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.5rem, 4.4vw, 2.4rem);
  line-height: 1.18;
  letter-spacing: -0.02em;
  margin: 10px 0 14px;
}

.page-about .about-head p {
  color: var(--steel);
  margin: 0;
}

/* ---------- 01 起点与扩张 ---------- */
.page-about .about-route {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  grid-template-columns: minmax(0, 1fr);
}

.page-about .about-route__text p {
  margin: 0 0 14px;
  color: var(--ice);
  opacity: 0.88;
  max-width: 62ch;
}

.page-about .about-route__text strong {
  color: var(--electric);
  font-weight: 600;
}

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

.page-about .about-bullets li {
  position: relative;
  padding: 11px 0 11px 22px;
  border-top: 1px solid var(--line-soft);
  font-size: 0.95rem;
  color: var(--ice);
}

.page-about .about-bullets li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 19px;
  width: 9px;
  height: 2px;
  background: var(--electric);
}

.page-about .about-route__aside {
  display: grid;
  gap: 12px;
  align-content: start;
}

.page-about .about-card {
  padding: 16px 18px;
  background: var(--midnight);
  border: 1px solid var(--line);
}

.page-about .about-card--accent {
  border-left: 3px solid var(--gold);
  background: linear-gradient(120deg, rgba(232, 180, 92, 0.12), var(--midnight) 62%);
}

.page-about .about-card__label {
  margin: 0 0 8px;
  font-size: 0.76rem;
  letter-spacing: 0.12em;
  color: var(--steel);
}

.page-about .about-card__value {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.05rem, 3.4vw, 1.3rem);
  line-height: 1.35;
  color: var(--ice);
}

.page-about .about-card--accent .about-card__value {
  color: var(--gold);
  font-size: clamp(1.8rem, 6vw, 2.4rem);
  letter-spacing: 0.02em;
}

.page-about .about-card__note {
  margin: 8px 0 0;
  font-size: 0.82rem;
  color: var(--steel);
}

/* ---------- 02 版本里程碑 ---------- */
.page-about .about-milestones {
  display: grid;
  gap: clamp(26px, 4vw, 44px);
  grid-template-columns: minmax(0, 1fr);
}

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 15px;
  top: 6px;
  bottom: 6px;
  width: 1px;
  background: linear-gradient(180deg, var(--electric) 0%, rgba(53, 224, 242, 0.28) 55%, var(--line) 100%);
}

.page-about .about-timeline__item {
  position: relative;
  display: grid;
  grid-template-columns: 32px minmax(0, 1fr);
  gap: 14px;
  padding: 0 0 22px;
  outline: none;
}

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

.page-about .about-timeline__rail {
  position: relative;
  display: flex;
  justify-content: center;
  padding-top: 20px;
}

.page-about .about-timeline__node {
  width: 9px;
  height: 9px;
  border: 1px solid var(--line);
  background: var(--deep-sea);
  transform: rotate(45deg);
  transition: background-color var(--t-med) var(--ease), border-color var(--t-med) var(--ease), box-shadow var(--t-med) var(--ease);
}

.page-about .about-timeline__body {
  padding: 14px 16px 16px;
  border: 1px solid var(--line);
  background: rgba(10, 39, 66, 0.55);
  transition: border-color var(--t-med) var(--ease), transform var(--t-med) var(--ease), background-color var(--t-med) var(--ease);
}

.page-about .about-timeline__item:hover .about-timeline__body,
.page-about .about-timeline__item:focus-visible .about-timeline__body,
.page-about .about-timeline__item:focus-within .about-timeline__body {
  border-color: var(--line-accent);
  background: rgba(10, 39, 66, 0.92);
  transform: translateX(2px);
}

.page-about .about-timeline__item:hover .about-timeline__node,
.page-about .about-timeline__item:focus-within .about-timeline__node {
  background: var(--electric);
  border-color: var(--electric);
  box-shadow: 0 0 0 4px rgba(53, 224, 242, 0.16);
}

.page-about .about-timeline__v {
  margin: 0 0 4px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.7rem, 6vw, 2.4rem);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--gold);
}

.page-about .about-timeline__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.05rem, 3.6vw, 1.3rem);
  letter-spacing: -0.01em;
  color: var(--ice);
}

.page-about .about-timeline__desc {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.72;
  color: var(--steel);
  max-width: 58ch;
}

.page-about .about-timeline__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 12px 0 0;
}

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

.page-about .about-milestones__figure figcaption,
.page-about .about-team__figure figcaption {
  margin-top: 10px;
  font-size: 0.8rem;
  color: var(--steel);
  line-height: 1.6;
}

/* ---------- 03 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
  grid-template-columns: minmax(0, 1fr);
}

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

.page-about .about-team__card {
  padding: 18px 18px 16px;
  background: var(--midnight);
  border: 1px solid var(--line);
  border-left: 2px solid var(--electric);
}

.page-about .about-team__num {
  margin: 0 0 10px;
  color: var(--steel);
  font-size: 0.78rem;
  letter-spacing: 0.1em;
}

.page-about .about-team__card h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--ice);
}

.page-about .about-team__card p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--steel);
}

.page-about .about-team__tag {
  margin-top: 12px !important;
}

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

/* ---------- 04 合作生态 ---------- */
.page-about .about-eco {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
  grid-template-columns: minmax(0, 1fr);
}

.page-about .about-eco__main p {
  margin: 0 0 14px;
  color: var(--ice);
  opacity: 0.88;
  max-width: 64ch;
}

.page-about .about-eco__main strong {
  color: var(--gold);
  font-weight: 600;
}

.page-about .about-eco__links {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  margin-top: 20px;
  padding-top: 18px;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-eco__aside {
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  align-content: start;
}

.page-about .about-eco__stat {
  background: rgba(4, 24, 38, 0.92);
  padding: 16px 18px 18px;
}

.page-about .about-eco__stat-num {
  margin: 0;
  font-family: var(--font-data);
  font-weight: 700;
  font-size: clamp(1.9rem, 7vw, 2.6rem);
  line-height: 1;
  color: var(--electric);
}

.page-about .about-eco__stat-num span {
  color: var(--gold);
  font-size: 0.6em;
  margin-left: 2px;
}

.page-about .about-eco__stat-label {
  margin: 10px 0 0;
  font-size: 0.85rem;
  color: var(--steel);
  line-height: 1.6;
}

/* ---------- 05 长期运营 ---------- */
.page-about .about-stability {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
  grid-template-columns: minmax(0, 1fr);
}

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

.page-about .about-stability__row {
  display: grid;
  gap: 6px;
  grid-template-columns: minmax(0, 1fr);
  padding: 16px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-stability__key {
  margin: 0;
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  color: var(--steel);
}

.page-about .about-stability__val {
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--ice);
}

.page-about .about-stability__big {
  font-family: var(--font-data);
  font-weight: 700;
  font-size: clamp(1.3rem, 4.6vw, 1.7rem);
  color: var(--gold);
  letter-spacing: 0.02em;
  flex: 0 0 auto;
}

.page-about .about-stability__notes {
  display: grid;
  gap: 12px;
  align-content: start;
}

.page-about .about-note {
  padding: 16px 18px;
  background: var(--midnight);
  border: 1px solid var(--line);
}

.page-about .about-note--accent {
  border-color: rgba(53, 224, 242, 0.35);
  background: linear-gradient(150deg, rgba(53, 224, 242, 0.1), var(--midnight) 60%);
}

.page-about .about-note h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  color: var(--ice);
}

.page-about .about-note p {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.72;
  color: var(--steel);
}

/* ---------- 行动区 ---------- */
.page-about .about-cta {
  padding: clamp(36px, 6vw, 68px) 0;
  background:
    linear-gradient(115deg, rgba(53, 224, 242, 0.14) 0%, rgba(4, 24, 38, 0) 52%),
    linear-gradient(180deg, var(--deep-sea) 0%, var(--midnight) 100%);
  border-top: 1px solid var(--line);
}

.page-about .about-cta__inner {
  display: grid;
  gap: clamp(20px, 4vw, 36px);
  grid-template-columns: minmax(0, 1fr);
  align-items: center;
}

.page-about .about-cta__text p {
  margin: 0;
  color: var(--steel);
  max-width: 56ch;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .about-stability__row {
    grid-template-columns: minmax(0, 200px) minmax(0, 1fr);
    gap: 20px;
    align-items: baseline;
  }

  .page-about .about-chapters__inner {
    overflow-x: visible;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-route {
    grid-template-columns: minmax(0, 1.7fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-milestones {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-milestones__figure {
    position: sticky;
    top: 76px;
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-eco {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-stability {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1.4fr) auto;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-timeline__body,
  .page-about .about-timeline__node,
  .page-about .about-index__link {
    transition: none;
  }

  .page-about .about-timeline__item:hover .about-timeline__body,
  .page-about .about-timeline__item:focus-within .about-timeline__body {
    transform: none;
  }
}
<<<END>>>