.page-about {
  --about-cut: 18px;
  --about-gutter: 24px;
  background: var(--paper);
  color: var(--text);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  background: var(--ink-900);
  color: var(--paper);
  padding: calc(var(--s7) + 68px) 0 var(--s6);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(660px 340px at 84% 12%, rgba(60, 224, 208, .15), transparent 68%),
    radial-gradient(520px 300px at 4% 98%, rgba(255, 106, 31, .10), transparent 72%);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: var(--s5);
  align-items: center;
}

.page-about .about-crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: rgba(245, 241, 232, .52);
  margin-bottom: var(--s3);
}

.page-about .about-crumbs a {
  color: rgba(245, 241, 232, .74);
  text-decoration: none;
}

.page-about .about-crumbs a:hover {
  color: var(--cyan);
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(32px, 8vw, 62px);
  line-height: 1.1;
  letter-spacing: -0.01em;
  margin: var(--s3) 0 var(--s3);
  color: var(--paper);
}

.page-about .about-hero__lead {
  max-width: 36em;
  color: rgba(245, 241, 232, .82);
  font-size: 17px;
  line-height: 1.8;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s2);
  margin-top: var(--s4);
}

.page-about .about-hero__visual {
  position: relative;
  width: min(100%, 400px);
  margin: 0 auto;
  opacity: .95;
}

.page-about .about-orbit {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .about-stats {
  position: relative;
  z-index: 1;
  list-style: none;
  margin: var(--s6) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid var(--line-dark);
  border-left: 1px solid var(--line-dark);
}

.page-about .about-stats li {
  padding: var(--s3) var(--s2);
  border-right: 1px solid var(--line-dark);
  border-bottom: 1px solid var(--line-dark);
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(22px, 5vw, 30px);
  line-height: 1.1;
  color: var(--cyan);
  letter-spacing: -0.01em;
}

.page-about .about-stat__label {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  color: rgba(245, 241, 232, .6);
}

/* ---------- 服务链路 ---------- */

.page-about .about-chain-section .section-head .lead {
  max-width: 40em;
}

.page-about .about-steps {
  margin-top: var(--s5);
  display: grid;
  gap: var(--s4);
}

.page-about .about-steps .steps__item {
  position: relative;
  padding-top: var(--s3);
  border-top: 2px solid var(--ink-900);
}

.page-about .about-steps .steps__index {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--signal);
  margin-bottom: var(--s1);
}

.page-about .about-steps .steps__title {
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 20px;
  letter-spacing: .01em;
  line-height: 1.35;
  margin: 0 0 var(--s2);
}

.page-about .about-steps .steps__text {
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--text);
  opacity: .84;
}

/* ---------- 发展历程 ---------- */

.page-about .about-history {
  background: var(--paper-300);
}

.page-about .tl {
  list-style: none;
  margin: var(--s5) 0 0;
  padding: 0;
  position: relative;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  top: 4px;
  bottom: 4px;
  left: 7px;
  width: 3px;
  transform: skewX(-6deg);
  transform-origin: top left;
  background: linear-gradient(180deg, var(--cyan) 0%, rgba(60, 224, 208, .38) 48%, rgba(60, 224, 208, .08) 100%);
}

.page-about .tl__item {
  position: relative;
  padding-left: 40px;
  padding-bottom: var(--s5);
}

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

.page-about .tl__dot {
  position: absolute;
  left: 0;
  top: 8px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(60, 224, 208, .18);
}

.page-about .tl__year {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: .06em;
  color: var(--ink-600);
  margin: 0 0 var(--s1);
}

.page-about .tl__title {
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 19px;
  line-height: 1.4;
  letter-spacing: .01em;
  margin: 0 0 var(--s2);
  color: var(--text);
}

.page-about .tl__text {
  font-size: 15.5px;
  line-height: 1.75;
  margin: 0;
  max-width: 36em;
  color: rgba(23, 33, 29, .78);
}

.page-about .about-annual {
  margin: var(--s6) auto 0;
  max-width: 400px;
  aspect-ratio: 4 / 5;
}

/* ---------- 内容与数据维护 ---------- */

.page-about .about-craft-section {
  background: var(--paper);
}

.page-about .about-workbench {
  margin: var(--s5) 0 0;
  aspect-ratio: 3 / 2;
}

.page-about .about-craft {
  display: grid;
  gap: var(--s4);
  margin-top: var(--s5);
}

.page-about .about-craft__col {
  padding-top: var(--s2);
  border-top: 2px solid var(--ink-900);
}

.page-about .about-craft__num {
  font-family: var(--font-mono);
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: .08em;
  color: var(--signal);
  margin: 0;
}

.page-about .about-craft__col h3 {
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 18px;
  letter-spacing: .02em;
  line-height: 1.4;
  margin: var(--s1) 0 var(--s2);
}

.page-about .about-craft__col p:last-child {
  font-size: 15.5px;
  line-height: 1.75;
  margin: 0;
  color: rgba(23, 33, 29, .8);
}

/* ---------- 协作生态 ---------- */

.page-about .about-partners {
  background: var(--ink-900);
  color: var(--paper);
}

.page-about .about-partners .section-title {
  color: var(--paper);
}

.page-about .about-partners__grid {
  display: grid;
  gap: var(--s5);
  align-items: start;
}

.page-about .about-partners__lead {
  font-size: 16.5px;
  line-height: 1.8;
  color: rgba(245, 241, 232, .8);
  max-width: 34em;
  margin: var(--s3) 0 0;
}

.page-about .about-ledger {
  list-style: none;
  margin: var(--s4) 0 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .about-ledger li {
  display: flex;
  align-items: baseline;
  gap: var(--s3);
  padding: var(--s2) 0;
  border-bottom: 1px solid var(--line-dark);
  font-size: 15px;
  color: rgba(245, 241, 232, .82);
}

.page-about .about-ledger__n {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 26px;
  line-height: 1;
  color: var(--cyan);
  min-width: 2.4ch;
}

.page-about .about-partners__note {
  margin: var(--s4) 0 var(--s4);
  font-size: 15.5px;
  line-height: 1.75;
  color: rgba(245, 241, 232, .74);
  max-width: 34em;
}

.page-about .about-venue {
  margin: 0;
  aspect-ratio: 12 / 7;
}

/* ---------- 三件不肯省的事 ---------- */

.page-about .about-values {
  background: var(--paper);
}

.page-about .about-values .accordion {
  margin-top: var(--s5);
  border-top: 1px solid var(--line);
}

/* ---------- 结尾 ---------- */

.page-about .about-cta__box {
  background: var(--ink-800);
  color: var(--paper);
  padding: var(--s5) var(--s4);
  display: grid;
  gap: var(--s4);
  clip-path: polygon(0 0, calc(100% - var(--about-cut)) 0, 100% var(--about-cut), 100% 100%, var(--about-cut) 100%, 0 calc(100% - var(--about-cut)));
}

.page-about .about-cta__text h2 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(24px, 5vw, 34px);
  line-height: 1.2;
  margin: 0 0 var(--s2);
  color: var(--paper);
}

.page-about .about-cta__text p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.75;
  color: rgba(245, 241, 232, .78);
  max-width: 36em;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s2);
}

/* ---------- 响应式 ---------- */

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

  .page-about .about-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--s4) var(--s4);
  }

  .page-about .about-craft {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: var(--s3);
  }
}

@media (min-width: 900px) {
  .page-about {
    --about-gutter: 40px;
  }

  .page-about .about-hero {
    padding: calc(var(--s8) + 72px) 0 var(--s6);
  }

  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    gap: var(--s6);
  }

  .page-about .about-hero__visual {
    width: 100%;
    max-width: 460px;
    margin: 0;
  }

  .page-about .about-hero__lead {
    font-size: 18px;
  }

  .page-about .about-partners__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: var(--s6);
  }

  .page-about .about-cta__box {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    padding: var(--s6) var(--s5);
  }

  .page-about .about-cta__actions {
    flex-wrap: nowrap;
  }

  /* 时间轴左右交替 */
  .page-about .tl::before {
    left: 50%;
    transform: translateX(-1px) skewX(-4deg);
  }

  .page-about .tl__item {
    width: 50%;
    padding-left: 0;
    padding-right: 48px;
    text-align: right;
  }

  .page-about .tl__item .tl__text {
    margin-left: auto;
  }

  .page-about .tl__item:nth-child(even) {
    margin-left: 50%;
    padding-right: 0;
    padding-left: 48px;
    text-align: left;
  }

  .page-about .tl__item:nth-child(even) .tl__text {
    margin-left: 0;
  }

  .page-about .tl__dot {
    left: auto;
    right: -8px;
  }

  .page-about .tl__item:nth-child(even) .tl__dot {
    left: -8px;
    right: auto;
  }

  .page-about .about-annual {
    max-width: 440px;
  }
}

@media (min-width: 1200px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-hero::before,
  .page-about .tl::before {
    transition: none;
  }
}
<<<END>>>