.page-about {
  --about-line: rgba(217, 152, 54, 0.28);
  --about-line-soft: rgba(217, 152, 54, 0.14);
  --about-left-bar: 4px;
  background: var(--indigo-night);
  color: var(--text-on-dark);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.75;
  overflow-x: hidden;
}

.page-about * {
  box-sizing: border-box;
}

/* ---------------- 首屏 ---------------- */

.page-about .about-hero {
  position: relative;
  padding: 34px 0 52px;
  background-color: var(--indigo-night);
  background-image:
    linear-gradient(rgba(42, 65, 102, 0.42) 1px, transparent 1px),
    linear-gradient(90deg, rgba(42, 65, 102, 0.42) 1px, transparent 1px);
  background-size: 68px 68px;
  border-bottom: 1px solid var(--about-line-soft);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: -1px;
  width: 46%;
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--amber));
  opacity: 0.6;
  pointer-events: none;
}

.page-about .crumbs {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--text-on-dark-dim);
  margin-bottom: 30px;
}

.page-about .crumbs a {
  color: var(--amber);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 200ms var(--ease-page);
}

.page-about .crumbs a:hover {
  border-bottom-color: var(--amber);
}

.page-about .crumbs__sep {
  margin: 0 8px;
  opacity: 0.5;
}

.page-about .eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.22em;
  color: var(--amber);
  padding-left: 32px;
  position: relative;
}

.page-about .eyebrow::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 24px;
  height: 1px;
  background: var(--amber);
  transform: translateY(-50%);
}

.page-about .about-hero__title {
  font-family: var(--font-title);
  font-weight: 900;
  font-size: clamp(32px, 8.2vw, 60px);
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--paper-white);
  margin: 16px 0 0;
  max-width: 15em;
}

.page-about .about-hero__title::after {
  content: "";
  display: block;
  width: 88px;
  height: 3px;
  margin-top: 22px;
  background: var(--amber);
}

.page-about .about-hero__lede {
  margin: 24px 0 0;
  max-width: 46em;
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--text-on-dark);
}

.page-about .about-facts {
  list-style: none;
  margin: 40px 0 0;
  padding: 26px 0 0;
  border-top: 1px solid var(--about-line-soft);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px 16px;
}

.page-about .stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 28px;
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--amber-bright);
}

.page-about .stat__label {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  letter-spacing: 0.05em;
  color: var(--text-on-dark-dim);
}

/* ---------------- 通用章节 ---------------- */

.page-about .about-section {
  position: relative;
  padding: 56px 0;
  border-bottom: 1px solid var(--about-line-soft);
}

.page-about .about-section--paper {
  background: var(--paper-yellow);
  color: var(--ink);
  border-bottom-color: rgba(12, 20, 32, 0.14);
}

.page-about .about-section--paper::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(
    135deg,
    rgba(12, 20, 32, 0.024) 0 2px,
    transparent 2px 9px
  );
}

.page-about .about-section--paper > .wrap {
  position: relative;
  z-index: 1;
}

.page-about .about-head {
  max-width: 62ch;
}

.page-about .section-num {
  display: inline-block;
  position: relative;
  padding-left: 32px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.2em;
  color: var(--signal-orange);
}

.page-about .section-num::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 22px;
  height: 1px;
  background: var(--amber);
  transform: translateY(-50%);
}

.page-about .about-head__title {
  font-family: var(--font-title);
  font-weight: 800;
  font-size: clamp(23px, 5.4vw, 36px);
  line-height: 1.24;
  letter-spacing: -0.01em;
  color: var(--paper-white);
  margin: 14px 0 16px;
}

.page-about .about-section--paper .about-head__title {
  color: var(--ink);
}

.page-about .about-head__lede {
  margin: 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--text-on-dark);
}

.page-about .about-section--paper .about-head__lede {
  color: var(--rock-gray);
}

/* ---------------- 01 时间线 ---------------- */

.page-about .timeline-wrap {
  display: grid;
  gap: 44px;
  margin-top: 46px;
}

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

.page-about .timeline__item {
  position: relative;
  display: grid;
  grid-template-columns: 92px minmax(0, 1fr);
  gap: 16px;
  padding-bottom: 34px;
}

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

.page-about .timeline__year {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 26px;
  line-height: 1.05;
  letter-spacing: -0.03em;
  color: var(--amber);
  padding-top: 2px;
  transition: color 220ms var(--ease-page);
}

@supports (-webkit-text-stroke: 1px #000) {
  .page-about .timeline__year {
    color: transparent;
    -webkit-text-stroke: 1.2px var(--amber);
  }
  .page-about .timeline__item:hover .timeline__year,
  .page-about .timeline__item:focus-within .timeline__year {
    color: var(--amber-bright);
    -webkit-text-stroke-color: var(--amber-bright);
  }
}

.page-about .timeline__note {
  position: relative;
  padding: 20px 20px 22px calc(20px + var(--about-left-bar));
  background: var(--indigo-mid);
  border: 1px solid var(--about-line);
  transition:
    transform 260ms var(--ease-page),
    border-color 260ms var(--ease-page),
    background-color 260ms var(--ease-page);
}

.page-about .timeline__note::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: var(--about-left-bar);
  background: linear-gradient(180deg, var(--amber) 0%, rgba(217, 152, 54, 0.35) 100%);
}

.page-about .timeline__note h3 {
  margin: 0 0 8px;
  font-family: var(--font-title);
  font-size: 18.5px;
  font-weight: 700;
  line-height: 1.35;
  color: var(--paper-white);
}

.page-about .timeline__note p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--text-on-dark);
}

.page-about .timeline__note .timeline__effect {
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: 1px dashed var(--about-line-soft);
  color: var(--amber-bright);
  font-size: 15px;
}

.page-about .about-figure {
  margin: 0;
  padding: 10px;
  background: var(--indigo-deep);
  border: 1px solid var(--about-line);
  box-shadow: var(--shadow-paper);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  background: var(--indigo-mid);
}

.page-about .about-figure figcaption {
  padding: 12px 4px 4px;
}

.page-about .media__caption {
  display: block;
  margin: 0;
  padding-left: 12px;
  border-left: 2px solid var(--amber);
  font-size: 13px;
  line-height: 1.6;
  color: var(--rock-gray);
}

.page-about .media__caption--light {
  color: var(--text-on-dark-dim);
}

/* ---------------- 02 说明牌纸条 ---------------- */

.page-about .slips {
  display: grid;
  gap: 18px;
  margin-top: 42px;
}

.page-about .slip {
  position: relative;
  padding: 26px 24px 28px;
  background: var(--paper-white);
  border: 1px solid rgba(12, 20, 32, 0.18);
  box-shadow: var(--shadow-paper);
}

.page-about .slip::before {
  content: "";
  position: absolute;
  inset: 6px;
  border: 1px solid rgba(217, 152, 54, 0.38);
  pointer-events: none;
}

.page-about .slip__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.22em;
  color: var(--signal-orange);
  margin-bottom: 12px;
}

.page-about .slip h3 {
  margin: 0 0 10px;
  font-family: var(--font-title);
  font-size: 20px;
  font-weight: 800;
  line-height: 1.3;
  color: var(--ink);
}

.page-about .slip p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--rock-gray);
}

/* ---------------- 03 产品线 ---------------- */

.page-about .lines-figure {
  margin: 40px 0 0;
  padding: 10px;
  background: var(--indigo-deep);
  border: 1px solid var(--about-line);
}

.page-about .lines-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  background: var(--indigo-mid);
}

.page-about .lines-figure figcaption {
  padding: 12px 4px 4px;
}

.page-about .lines {
  display: grid;
  gap: 16px;
  margin-top: 30px;
}

.page-about .line-card {
  position: relative;
  padding: 24px 22px 26px;
  background: linear-gradient(158deg, var(--indigo-mid) 0%, var(--indigo-deep) 100%);
  border: 1px solid var(--about-line);
}

.page-about .line-card__id {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.18em;
  color: var(--signal-orange);
  padding: 3px 10px;
  border: 1px solid rgba(242, 99, 46, 0.5);
  background: rgba(242, 99, 46, 0.08);
}

.page-about .line-card h3 {
  margin: 14px 0 8px;
  font-family: var(--font-title);
  font-size: 19px;
  font-weight: 700;
  line-height: 1.35;
  color: var(--paper-white);
}

.page-about .line-card p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--text-on-dark);
}

/* ---------------- 04 团队 ---------------- */

.page-about .team-wrap {
  display: grid;
  gap: 30px;
  margin-top: 42px;
}

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

.page-about .crew__item {
  background: var(--indigo-night);
  padding: 22px 20px;
}

.page-about .crew__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--amber-bright);
}

.page-about .crew__name {
  display: block;
  margin-top: 10px;
  font-family: var(--font-title);
  font-size: 17.5px;
  font-weight: 700;
  color: var(--paper-white);
}

.page-about .crew__desc {
  display: block;
  margin-top: 6px;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--text-on-dark-dim);
}

.page-about .team-figure {
  margin: 0;
  padding: 10px;
  background: var(--indigo-deep);
  border: 1px solid var(--about-line);
}

.page-about .team-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  background: var(--indigo-mid);
}

.page-about .team-figure figcaption {
  padding: 12px 4px 4px;
}

.page-about .cadence {
  margin-top: 30px;
  padding: 24px 22px;
  background: var(--indigo-deep);
  border: 1px solid var(--about-line);
  border-left: var(--about-left-bar) solid var(--amber);
  display: grid;
  gap: 18px;
}

.page-about .cadence__item {
  display: grid;
  gap: 6px;
}

.page-about .cadence__key {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--signal-orange);
}

.page-about .cadence__val {
  font-size: 15.5px;
  line-height: 1.7;
  color: var(--text-on-dark);
}

/* ---------------- 05 覆盖与合作 ---------------- */

.page-about .reach-wrap {
  display: grid;
  gap: 34px;
  margin-top: 42px;
}

.page-about .dotmap {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
  max-width: 520px;
}

.page-about .dotmap span {
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--indigo-mid);
  opacity: 0.5;
}

.page-about .dotmap span.is-home {
  background: var(--signal-orange);
  opacity: 1;
  box-shadow: 0 0 0 4px rgba(242, 99, 46, 0.2);
}

.page-about .reach-visual__legend {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 20px 0 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--rock-gray);
}

.page-about .legend-dot {
  flex: none;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--signal-orange);
}

.page-about .reach-cards {
  display: grid;
  gap: 18px;
}

.page-about .reach-card {
  position: relative;
  padding: 24px 22px 26px 26px;
  background: var(--paper-white);
  border: 1px solid rgba(12, 20, 32, 0.16);
  box-shadow: var(--shadow-paper);
}

.page-about .reach-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: var(--about-left-bar);
  background: var(--amber);
}

.page-about .reach-card__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 32px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--indigo-mid);
}

.page-about .reach-card h3 {
  margin: 8px 0 10px;
  font-family: var(--font-title);
  font-size: 18px;
  font-weight: 800;
  line-height: 1.35;
  color: var(--ink);
}

.page-about .reach-card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--rock-gray);
}

/* ---------------- 06 资质 ---------------- */

.page-about .about-section--record {
  padding-top: 52px;
}

.page-about .record {
  margin: 38px 0 0;
  display: grid;
  gap: 1px;
  background: rgba(12, 20, 32, 0.14);
  border: 1px solid rgba(12, 20, 32, 0.16);
}

.page-about .record__row {
  background: var(--paper-white);
  padding: 18px 20px;
  display: grid;
  gap: 6px;
}

.page-about .record__row dt {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--rock-gray);
}

.page-about .record__row dd {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.7;
  color: var(--ink);
}

.page-about .record__mono {
  font-family: var(--font-mono);
  letter-spacing: 0.01em;
  word-break: break-word;
}

/* ---------------- 07 接下来去哪 ---------------- */

.page-about .about-section--closing {
  background: var(--indigo-deep);
  border-bottom: none;
  padding-bottom: 76px;
}

.page-about .next-list {
  list-style: none;
  margin: 42px 0 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .next-card {
  display: grid;
  gap: 8px;
  padding: 24px 22px 22px;
  text-decoration: none;
  background: var(--indigo-night);
  border: 1px solid var(--about-line);
  transition:
    transform 240ms var(--ease-page),
    border-color 240ms var(--ease-page),
    background-color 240ms var(--ease-page);
}

.page-about .next-card__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--signal-orange);
}

.page-about .next-card__title {
  font-family: var(--font-title);
  font-size: 20px;
  font-weight: 800;
  line-height: 1.3;
  color: var(--paper-white);
}

.page-about .next-card__desc {
  font-size: 15px;
  line-height: 1.75;
  color: var(--text-on-dark-dim);
}

.page-about .next-card__go {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.12em;
  color: var(--amber);
}

.page-about .next-card:hover,
.page-about .next-card:focus-visible {
  transform: translateY(-3px);
  border-color: var(--amber-bright);
  background: var(--indigo-mid);
}

.page-about .next-card:focus-visible {
  outline: 2px solid var(--amber-bright);
  outline-offset: 3px;
}

/* ---------------- 平板及以上 ---------------- */

@media (min-width: 720px) {
  .page-about .about-hero {
    padding: 44px 0 64px;
  }

  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 24px;
  }

  .page-about .stat__num {
    font-size: 34px;
  }

  .page-about .about-section {
    padding: 78px 0;
  }

  .page-about .timeline__item {
    grid-template-columns: 128px minmax(0, 1fr);
    gap: 22px;
    padding-bottom: 42px;
  }

  .page-about .timeline__year {
    font-size: 38px;
    text-align: right;
  }

  .page-about .lines {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
  }

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

  .page-about .cadence {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 28px;
    padding: 28px 26px;
  }

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

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

  .page-about .next-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
  }
}

/* ---------------- 桌面宽屏 ---------------- */

@media (min-width: 1000px) {
  .page-about .timeline-wrap {
    grid-template-columns: minmax(0, 1fr) 282px;
    gap: 56px;
    align-items: start;
  }

  .page-about .about-figure {
    position: sticky;
    top: 32px;
  }

  .page-about .slips {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 26px;
    align-items: start;
  }

  .page-about .slip:nth-child(1) {
    transform: translateY(0);
  }

  .page-about .slip:nth-child(2) {
    transform: translateY(26px);
  }

  .page-about .slip:nth-child(3) {
    transform: translateY(-12px);
  }

  .page-about .team-wrap {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    gap: 40px;
    align-items: start;
  }

  .page-about .reach-wrap {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    gap: 52px;
    align-items: start;
  }

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

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

  .page-about .line-card {
    padding: 28px 26px 30px;
  }
}

/* ---------------- 悬停能力受限 ---------------- */

@media (hover: none) {
  .page-about .timeline__item:hover .timeline__note {
    transform: none;
  }
}

@media (hover: hover) {
  .page-about .timeline__item:hover .timeline__note {
    transform: translateX(5px);
    border-color: var(--amber-bright);
    background: var(--indigo-deep);
  }
}

/* ---------------- 减少动效 ---------------- */

@media (prefers-reduced-motion: reduce) {
  .page-about .timeline__note,
  .page-about .timeline__year,
  .page-about .next-card {
    transition: none !important;
  }

  .page-about .timeline__item:hover .timeline__note,
  .page-about .next-card:hover {
    transform: none;
  }
}
<<<END>>>