.page-about {
  --about-hair: rgba(43, 232, 207, 0.16);
  --about-hair-strong: rgba(43, 232, 207, 0.45);
  --about-paper-rule: rgba(26, 21, 16, 0.16);
  --about-body-dark: rgba(244, 235, 221, 0.86);
  --about-body-paper: rgba(26, 21, 16, 0.82);
  background: var(--ink-deep);
  color: var(--paper);
}

.page-about img {
  max-width: 100%;
  height: auto;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(56px, 8vw, 96px) 0 clamp(36px, 6vw, 64px);
  border-bottom: 1px solid var(--about-hair);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(43, 232, 207, 0.07) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(43, 232, 207, 0.07) 1px, transparent 1px);
  background-size: 96px 96px;
  -webkit-mask-image: linear-gradient(to bottom, #000 0%, rgba(0, 0, 0, 0.35) 70%, transparent 100%);
  mask-image: linear-gradient(to bottom, #000 0%, rgba(0, 0, 0, 0.35) 70%, transparent 100%);
}

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

.page-about .breadcrumb {
  margin-bottom: clamp(26px, 4vw, 48px);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
  align-items: end;
}

.page-about .about-hero__title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(38px, 8.5vw, 88px);
  line-height: 0.98;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-hero__lead {
  margin: clamp(16px, 2.5vw, 24px) 0 0;
  max-width: 56ch;
  font-size: clamp(15px, 1.9vw, 18px);
  line-height: 1.78;
  color: var(--about-body-dark);
}

.page-about .about-hero__aside {
  border-top: 1px solid var(--about-hair-strong);
  padding-top: 14px;
}

.page-about .about-hero__note-title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-hero__note {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .about-hero__stamp {
  margin: 16px 0 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: rgba(169, 185, 206, 0.55);
}

.page-about .about-hero__figure {
  margin: clamp(30px, 5vw, 56px) 0 0;
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  border: 1px solid var(--about-hair);
}

/* ---------- 章节通用 ---------- */

.page-about .mission-block {
  padding: clamp(42px, 7vw, 92px) 0;
  border-bottom: 1px solid var(--about-hair);
  scroll-margin-top: 96px;
}

.page-about .mission-block__grid {
  display: grid;
  gap: clamp(20px, 3vw, 30px);
}

.page-about .mission-block__rail {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding-left: 14px;
  border-left: 1px solid var(--about-hair);
}

.page-about .mission-block__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(30px, 5vw, 48px);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--cyan);
  transition: color 200ms ease, opacity 200ms ease;
}

.page-about .mission-block__note {
  margin: 0;
  max-width: 30ch;
  font-size: 12.5px;
  line-height: 1.68;
  color: var(--mist);
}

.page-about .mission-block__body {
  min-width: 0;
}

.page-about .mission-block__title {
  margin: 0 0 clamp(14px, 2vw, 20px);
  font-family: var(--font-body);
  font-weight: 700;
  font-size: clamp(24px, 4vw, 40px);
  line-height: 1.16;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .mission-block__lead {
  margin: 0 0 clamp(20px, 3vw, 30px);
  max-width: 62ch;
  font-size: clamp(15px, 1.8vw, 17px);
  line-height: 1.8;
  color: var(--about-body-dark);
}

.page-about .mission-block__figure {
  margin: clamp(24px, 3.5vw, 38px) 0 0;
}

.page-about .mission-block__figure img {
  display: block;
  width: 100%;
  border: 1px solid var(--about-hair);
}

.page-about .chapter[data-active="true"] .mission-block__num {
  color: var(--orange);
}

/* ---------- 奶油纸面章节 ---------- */

.page-about .mission-block--paper {
  background: var(--paper);
  color: var(--ink-brown);
  border-bottom-color: rgba(26, 21, 16, 0.12);
}

.page-about .mission-block--paper .mission-block__rail {
  border-left-color: var(--about-paper-rule);
}

.page-about .mission-block--paper .mission-block__num {
  color: var(--ink-brown);
}

.page-about .mission-block--paper .mission-block__note {
  color: rgba(26, 21, 16, 0.58);
}

.page-about .mission-block--paper .mission-block__title {
  color: var(--ink-brown);
}

.page-about .mission-block--paper .mission-block__lead {
  color: var(--about-body-paper);
}

.page-about .chapter[data-active="true"].mission-block--paper .mission-block__num {
  color: var(--steel);
}

/* ---------- 三段内容列表 ---------- */

.page-about .stage-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--about-hair);
  border: 1px solid var(--about-hair);
}

.page-about .stage-list__item {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: clamp(16px, 2.4vw, 24px);
  background: var(--ink-deep);
  transition: background 200ms ease, transform 200ms ease;
}

.page-about .stage-list__item:hover {
  background: var(--ink-mid);
  transform: translate(3px, -3px);
}

.page-about .stage-list__title {
  margin: 0;
  font-size: 16px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .stage-list__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--about-body-dark);
}

/* ---------- 数据条 ---------- */

.page-about .data-strip {
  display: grid;
  gap: 1px;
  background: var(--about-paper-rule);
  border: 1px solid var(--about-paper-rule);
}

.page-about .data-strip__item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: clamp(16px, 2.2vw, 22px);
  background: var(--paper);
  transition: box-shadow 180ms ease, transform 180ms ease;
}

.page-about .data-strip__item:hover {
  box-shadow: inset 0 0 0 1px var(--steel);
  transform: translate(2px, -2px);
}

.page-about .data-strip__value {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(30px, 4.4vw, 46px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--ink-brown);
}

.page-about .data-strip__label {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--steel);
}

.page-about .data-strip__note {
  margin: 4px 0 0;
  font-size: 13px;
  line-height: 1.65;
  color: rgba(26, 21, 16, 0.64);
}

/* ---------- 节奏列表 ---------- */

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

.page-about .rhythm-list__item {
  display: grid;
  gap: 6px 18px;
  padding: 15px 0;
  border-bottom: 1px solid var(--about-hair);
}

.page-about .rhythm-list__time {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--cyan);
}

.page-about .rhythm-list__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--about-body-dark);
}

/* ---------- 技术卡片 ---------- */

.page-about .tech-grid {
  display: grid;
  gap: 1px;
  background: var(--about-paper-rule);
  border: 1px solid var(--about-paper-rule);
}

.page-about .tech-grid__item {
  display: flex;
  flex-direction: column;
  gap: 7px;
  padding: clamp(16px, 2.4vw, 24px);
  background: var(--paper);
  transition: transform 180ms ease, box-shadow 180ms ease;
}

.page-about .tech-grid__item:hover {
  transform: translate(2px, -2px);
  box-shadow: inset 0 0 0 1px var(--steel);
}

.page-about .tech-grid__title {
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: 9px;
  font-size: 15.5px;
  font-weight: 700;
  color: var(--ink-brown);
}

.page-about .tech-grid__title::before {
  content: "";
  flex: 0 0 auto;
  width: 14px;
  height: 2px;
  background: var(--steel);
}

.page-about .tech-grid__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--about-body-paper);
}

/* ---------- 版本时间轴 ---------- */

.page-about .timeline {
  overflow-x: auto;
  padding-bottom: 10px;
  -webkit-overflow-scrolling: touch;
}

.page-about .timeline:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 6px;
}

.page-about .timeline__track {
  list-style: none;
  margin: 0;
  padding: 0 0 4px;
  display: flex;
  gap: clamp(14px, 2.4vw, 24px);
  min-width: 660px;
}

.page-about .timeline__item {
  position: relative;
  flex: 1 1 0;
  min-width: 200px;
  padding-top: 16px;
  border-top: 2px solid var(--about-hair-strong);
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  top: -5px;
  left: 0;
  width: 8px;
  height: 8px;
  background: var(--cyan);
}

.page-about .timeline__ver {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--orange);
}

.page-about .timeline__title {
  margin: 8px 0 7px;
  font-size: 17px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .timeline__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--about-body-dark);
}

/* ---------- 团队名单 ---------- */

.page-about .crew-list {
  margin: clamp(20px, 3vw, 30px) 0 0;
  display: grid;
  gap: 1px;
  background: var(--about-paper-rule);
  border: 1px solid var(--about-paper-rule);
}

.page-about .crew-list__item {
  padding: clamp(14px, 2vw, 20px);
  background: var(--paper);
}

.page-about .crew-list__num {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 3.4vw, 34px);
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--ink-brown);
}

.page-about .crew-list__text {
  margin: 7px 0 0;
  font-size: 14px;
  line-height: 1.68;
  color: rgba(26, 21, 16, 0.72);
}

/* ---------- 结尾 ---------- */

.page-about .about-cta {
  position: relative;
  padding: clamp(42px, 7vw, 88px) 0 clamp(48px, 8vw, 96px);
  background: linear-gradient(165deg, var(--ink-mid) 0%, var(--ink-deep) 70%);
  border-top: 2px solid var(--about-hair-strong);
}

.page-about .about-cta__title {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(28px, 5vw, 48px);
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-cta__text {
  margin: 0 0 clamp(22px, 3vw, 30px);
  max-width: 58ch;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--about-body-dark);
}

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

/* ---------- 断点 ---------- */

@media (min-width: 640px) {
  .page-about .stage-list,
  .page-about .tech-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .rhythm-list__item {
    grid-template-columns: minmax(118px, 168px) minmax(0, 1fr);
    align-items: baseline;
  }

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

@media (min-width: 880px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1fr) minmax(240px, 320px);
    gap: clamp(32px, 5vw, 80px);
  }

  .page-about .about-hero__aside {
    border-top: 0;
    border-left: 2px solid var(--cyan);
    padding: 4px 0 4px 18px;
  }

  .page-about .mission-block__grid {
    grid-template-columns: minmax(140px, 210px) minmax(0, 1fr);
    gap: clamp(32px, 5vw, 72px);
    align-items: start;
  }

  .page-about .mission-block__rail {
    position: sticky;
    top: 110px;
  }
}

@media (min-width: 1000px) {
  .page-about .stage-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .stage-list__item,
  .page-about .data-strip__item,
  .page-about .tech-grid__item,
  .page-about .mission-block__num {
    transition: none;
  }

  .page-about .stage-list__item:hover,
  .page-about .data-strip__item:hover,
  .page-about .tech-grid__item:hover {
    transform: none;
  }
}
<<<END>>>