.page-about {
  --about-col: 33em;
  --about-gap: clamp(26px, 3.8vw, 52px);
  background: var(--c-base);
  color: var(--c-ink);
  padding-bottom: clamp(56px, 8vw, 112px);
}

.page-about .about-wrap {
  width: min(100% - 2 * var(--gutter), var(--maxw));
  margin-inline: auto;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: clamp(16px, 2.6vw, 34px);
}

.page-about .about-hero__kicker {
  display: inline-block;
  margin-top: clamp(22px, 3.4vw, 42px);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--c-cyan);
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  max-width: 15em;
  font-size: clamp(30px, 5vw, 62px);
  font-weight: 900;
  line-height: 1.14;
  letter-spacing: -0.02em;
}

.page-about .about-hero__lead {
  margin: clamp(18px, 2.4vw, 28px) 0 0;
  max-width: var(--about-col);
  font-size: clamp(16px, 1.5vw, 18px);
  line-height: 1.85;
  color: var(--c-muted);
}

.page-about .about-figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(28px, 4vw, 46px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--c-line);
  border: 1px solid var(--c-line);
}

.page-about .about-figures__item {
  background: var(--c-deep);
  padding: 18px 16px 20px;
}

.page-about .about-figures__value {
  display: block;
  font-size: clamp(24px, 3.4vw, 34px);
  line-height: 1.1;
  color: var(--c-cyan);
}

.page-about .about-figures__label {
  display: block;
  margin-top: 7px;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--c-muted);
}

.page-about .about-hero__media {
  margin: clamp(32px, 5vw, 64px) 0 0;
  border: 1px solid var(--c-line);
  background: var(--c-deep);
}

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

/* ---------- 章节骨架 ---------- */
.page-about .about-body {
  margin-top: clamp(44px, 6vw, 88px);
}

.page-about .about-chapter {
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  padding-block: var(--about-gap);
}

.page-about .about-chapter__num {
  font-size: clamp(32px, 7.5vw, 42px);
  line-height: 1;
  letter-spacing: -0.04em;
  color: var(--c-cyan);
}

.page-about .about-chapter__body {
  max-width: var(--about-col);
}

.page-about .about-chapter__title {
  margin: 0 0 20px;
  font-size: clamp(21px, 3vw, 32px);
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: -0.01em;
}

.page-about .about-chapter__body p {
  margin: 0 0 1.05em;
  font-size: clamp(15.5px, 1.3vw, 17px);
  line-height: 1.85;
}

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

.page-about .about-chapter__body a {
  color: var(--c-cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

.page-about .about-chapter__body a:hover {
  color: var(--c-ink);
}

/* ---------- 章节间细线与纸感标签 ---------- */
.page-about .about-break {
  display: flex;
  align-items: center;
  gap: clamp(12px, 2vw, 20px);
}

.page-about .about-break::before,
.page-about .about-break::after {
  content: "";
  flex: 1 1 auto;
  height: 1px;
  background: var(--c-line);
}

.page-about .paper-tag {
  flex: 0 0 auto;
  padding: 5px 11px;
  background: var(--c-paper);
  color: var(--c-base);
  border: 1px solid var(--c-base);
  font-size: 11px;
  line-height: 1.5;
  letter-spacing: 0.08em;
  white-space: nowrap;
}

/* ---------- 流程模块 ---------- */
.page-about .about-flow__media {
  margin: 26px 0 0;
  border: 1px solid var(--c-line);
  background: var(--c-deep);
}

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

.page-about .about-flow {
  margin-top: 28px;
}

.page-about .about-flow__tabs {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 6px;
  scrollbar-width: none;
}

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

.page-about .about-flow__tabs .segmented__tab {
  flex: 0 0 auto;
  white-space: nowrap;
}

.page-about .about-flow .panel {
  margin-top: 16px;
  padding: clamp(20px, 3vw, 30px);
  border: 1px solid var(--c-line);
  background: var(--c-deep);
}

.page-about .panel__time {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--c-cyan);
}

.page-about .panel__title {
  margin: 8px 0 10px;
  font-size: clamp(18px, 2.2vw, 22px);
  font-weight: 800;
  line-height: 1.35;
}

.page-about .about-flow .panel p:last-child {
  margin: 0;
  font-size: clamp(15px, 1.3vw, 16.5px);
  line-height: 1.8;
  color: var(--c-muted);
}

/* ---------- 发展节点 ---------- */
.page-about .about-milestones__media {
  margin: 28px 0 0;
  border: 1px solid var(--c-line);
  background: var(--c-deep);
  overflow: hidden;
}

.page-about .about-milestones__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 12 / 5;
  object-fit: cover;
  opacity: 0.45;
}

.page-about .about-timeline {
  list-style: none;
  margin: 26px 0 0;
  padding: 0 0 0 28px;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 10px;
  bottom: 12px;
  width: 1px;
  background: var(--c-line);
}

.page-about .about-timeline__item {
  position: relative;
  padding-bottom: 28px;
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -24px;
  top: 5px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--c-base);
  border: 1px solid var(--c-cyan);
}

.page-about .about-timeline__item:last-child::before {
  background: var(--c-cyan);
}

.page-about .about-timeline__year {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--c-cyan);
}

.page-about .about-timeline__text {
  margin: 7px 0 0;
  font-size: clamp(15px, 1.3vw, 16.5px);
  line-height: 1.8;
}

.page-about .about-timeline__link {
  display: inline-block;
  margin-top: 8px;
  font-size: 13px;
  color: var(--c-cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

.page-about .about-timeline__link:hover {
  color: var(--c-ink);
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  margin-top: clamp(48px, 7vw, 96px);
  padding: clamp(26px, 4.5vw, 52px);
  border: 1px solid var(--c-line);
  background:
    linear-gradient(118deg, rgba(52, 231, 210, 0.14) 0%, rgba(10, 22, 38, 0) 52%),
    var(--c-deep);
}

.page-about .about-cta__label {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--c-cyan);
}

.page-about .about-cta__title {
  margin: 12px 0 0;
  font-size: clamp(22px, 3.4vw, 36px);
  font-weight: 900;
  line-height: 1.22;
  letter-spacing: -0.01em;
  max-width: 18em;
}

.page-about .about-cta__text {
  margin: 14px 0 0;
  max-width: 30em;
  font-size: clamp(15px, 1.3vw, 16.5px);
  line-height: 1.8;
  color: var(--c-muted);
}

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

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-about .about-figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-chapter {
    grid-template-columns: 128px minmax(0, 1fr);
    column-gap: clamp(24px, 5vw, 72px);
    align-items: start;
  }

  .page-about .about-chapter__num {
    font-size: 72px;
    position: sticky;
    top: 104px;
    align-self: start;
  }

  .page-about .about-break {
    padding-left: 128px;
  }

  .page-about .about-break::before {
    flex: 0 0 clamp(24px, 4vw, 60px);
  }
}

@media (min-width: 1080px) {
  .page-about .about-chapter__body {
    padding-right: clamp(0px, 6vw, 96px);
  }
}

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