.page-about {
  --about-content-x: var(--gutter);
  --about-axis-offset: 22px;
  --about-node-indent: 68px;
  background: var(--night);
  color: var(--silver);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(36px, 6.5vw, 80px) 0 clamp(34px, 5.5vw, 68px);
  background:
    radial-gradient(circle at 88% 6%, rgba(255, 122, 41, 0.15), transparent 44%),
    radial-gradient(circle at 5% 94%, rgba(168, 95, 58, 0.2), transparent 42%),
    var(--night);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle, rgba(198, 210, 226, 0.55) 0.8px, transparent 0.8px),
    radial-gradient(circle, rgba(255, 122, 41, 0.5) 0.8px, transparent 0.8px);
  background-size: 116px 116px, 178px 178px;
  background-position: 12px 24px, 62px 10px;
  opacity: 0.36;
  pointer-events: none;
  -webkit-mask-image: linear-gradient(180deg, #000 0%, rgba(0, 0, 0, 0.18) 76%, transparent 100%);
  mask-image: linear-gradient(180deg, #000 0%, rgba(0, 0, 0, 0.18) 76%, transparent 100%);
}

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

.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--grey);
  margin-bottom: 20px;
}

.page-about .breadcrumb a {
  color: var(--silver);
  text-decoration: none;
  transition: color var(--ease);
}

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--signal);
}

.page-about .about-sep {
  color: var(--ochre);
}

.page-about .about-hero h1 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.1rem, 7.2vw, 4.4rem);
  line-height: 1.06;
  letter-spacing: 0.06em;
  color: var(--moon);
}

.page-about .about-hero__lead {
  max-width: 58ch;
  margin: 22px 0 0;
  font-size: clamp(15.5px, 1.05vw + 12px, 17px);
  line-height: 1.82;
  color: var(--silver);
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 34px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-hero__facts li {
  display: flex;
  flex-direction: column;
  gap: 7px;
  padding: 16px 16px 18px;
  background: rgba(13, 19, 34, 0.86);
}

.page-about .about-hero__num {
  font-size: 1.3rem;
  letter-spacing: 0.05em;
  color: var(--signal);
  line-height: 1.1;
}

.page-about .about-hero__label {
  font-size: 12.5px;
  letter-spacing: 0.03em;
  color: var(--grey);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  position: relative;
  padding-top: clamp(34px, 5.5vw, 68px);
  padding-bottom: clamp(20px, 3.5vw, 40px);
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: calc(var(--about-content-x) + var(--about-axis-offset));
  width: 2px;
  background: linear-gradient(180deg, var(--signal) 0%, var(--line) 10%, var(--line) 90%, transparent 100%);
  opacity: 0.55;
  pointer-events: none;
}

.page-about .about-node {
  position: relative;
  padding-left: var(--about-node-indent);
  padding-block: clamp(26px, 4.5vw, 48px);
}

.page-about .about-node__stamp {
  position: absolute;
  left: 0;
  top: clamp(26px, 4.5vw, 48px);
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  background: var(--ochre);
  color: var(--moon);
  font-size: 10.5px;
  letter-spacing: 0.06em;
  border-radius: 4px 14px 4px 14px;
  transition: background var(--ease), transform var(--ease);
}

.page-about .about-node:hover .about-node__stamp {
  background: var(--signal);
  transform: translateY(-2px);
}

.page-about .about-node h2 {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.45rem, 3.6vw, 2.15rem);
  line-height: 1.26;
  letter-spacing: 0.04em;
  color: var(--moon);
}

.page-about .about-node__body > p {
  max-width: 64ch;
  margin: 16px 0 0;
  font-size: clamp(15.5px, 1.05vw + 12px, 17px);
  line-height: 1.82;
  color: var(--silver);
}

.page-about .about-node__body a {
  color: var(--amber);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 179, 92, 0.42);
  transition: color var(--ease), border-color var(--ease);
}

.page-about .about-node__body a:hover,
.page-about .about-node__body a:focus-visible {
  color: var(--signal);
  border-bottom-color: var(--signal);
}

.page-about .about-node__body > .about-node__aside {
  max-width: 56ch;
  margin-top: 20px;
  padding: 13px 16px;
  border-left: 2px solid var(--line);
  background: rgba(13, 19, 34, 0.66);
  color: var(--grey);
  font-size: 13.5px;
  line-height: 1.72;
  transition: border-color var(--ease), color var(--ease);
}

.page-about .about-node:hover .about-node__aside {
  border-left-color: var(--signal);
  color: var(--silver);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: clamp(22px, 3.4vw, 34px) 0 0;
  max-width: 880px;
}

.page-about .about-figure figcaption {
  margin-top: 10px;
  font-size: 11.5px;
  letter-spacing: 0.05em;
  color: var(--grey);
}

.page-about .about-figure--star {
  max-width: 420px;
}

/* ---------- 团队分工 ---------- */
.page-about .about-team {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-top: clamp(24px, 3.6vw, 34px);
}

.page-about .about-team__col {
  padding: 20px 20px 22px;
  background: var(--deep);
  border: 1px solid var(--line);
  border-radius: var(--radius-organic);
  transition: border-color var(--ease), transform var(--ease);
}

.page-about .about-team__col:hover {
  border-color: var(--signal);
  transform: translateY(-3px);
}

.page-about .about-team__num {
  display: inline-block;
  font-size: 1.65rem;
  line-height: 1;
  letter-spacing: 0.03em;
  color: var(--signal);
}

.page-about .about-team__col h3 {
  margin: 14px 0 0;
  font-size: 1rem;
  letter-spacing: 0.07em;
  color: var(--moon);
}

.page-about .about-team__col p {
  margin: 9px 0 0;
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--grey);
}

/* ---------- 流程 ---------- */
.page-about .about-flow {
  list-style: none;
  margin: clamp(24px, 3.6vw, 34px) 0 0;
  padding: 0;
  max-width: 640px;
}

.page-about .about-flow__item {
  position: relative;
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 0 18px;
  padding-bottom: 22px;
}

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

.page-about .about-flow__item:not(:last-child)::after {
  content: "";
  position: absolute;
  left: 21px;
  top: 32px;
  bottom: 4px;
  width: 1px;
  background: var(--line);
}

.page-about .about-flow__no {
  position: relative;
  z-index: 1;
  display: grid;
  place-items: center;
  width: 44px;
  height: 30px;
  border: 1px solid var(--line);
  background: var(--deep);
  color: var(--grey);
  font-size: 12px;
  letter-spacing: 0.08em;
  transition: color var(--ease), background var(--ease), border-color var(--ease);
}

.page-about .about-flow__item:hover .about-flow__no {
  color: var(--night);
  background: var(--signal);
  border-color: var(--signal);
}

.page-about .about-flow__text h3 {
  margin: 0;
  font-size: 15.5px;
  font-weight: 600;
  line-height: 30px;
  letter-spacing: 0.08em;
  color: var(--moon);
}

.page-about .about-flow__text p {
  margin: 6px 0 0;
  font-size: 14px;
  line-height: 1.76;
  color: var(--silver);
}

/* ---------- 三条做法 ---------- */
.page-about .about-principles {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin-top: clamp(24px, 3.6vw, 34px);
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-principle {
  display: flex;
  flex-direction: column;
  gap: 9px;
  padding: 24px 22px 26px;
  background: var(--night);
  transition: background var(--ease);
}

.page-about .about-principle:hover {
  background: var(--deep);
}

.page-about .about-principle__no {
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--ochre);
}

.page-about .about-principle h3 {
  margin: 0;
  font-size: 1.05rem;
  letter-spacing: 0.07em;
  color: var(--moon);
}

.page-about .about-principle p {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--silver);
}

/* ---------- 收尾 ---------- */
.page-about .about-cta-wrap {
  padding: clamp(24px, 4vw, 46px) 0 clamp(40px, 6vw, 76px);
}

.page-about .about-cta {
  padding: clamp(26px, 4vw, 46px);
  background:
    linear-gradient(135deg, rgba(168, 95, 58, 0.24), rgba(6, 9, 15, 0) 62%),
    var(--deep);
  border: 1px solid var(--line);
  border-radius: 4px 30px 4px 30px;
}

.page-about .about-cta h2 {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.35rem, 3vw, 1.9rem);
  letter-spacing: 0.04em;
  color: var(--moon);
}

.page-about .about-cta p {
  max-width: 58ch;
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--silver);
}

.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

/* ---------- 断点 ---------- */
@media (min-width: 760px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-team {
    grid-template-columns: 1.35fr 0.85fr 1fr;
    align-items: stretch;
  }
}

@media (min-width: 900px) {
  .page-about .about-timeline::before {
    left: calc(var(--about-content-x) + 92px);
  }

  .page-about .about-node {
    padding-left: 168px;
  }

  .page-about .about-node__stamp {
    left: 60px;
    top: clamp(26px, 4.5vw, 48px);
    width: 64px;
    height: 64px;
    font-size: 12px;
  }
}

@media (min-width: 860px) {
  .page-about .about-principles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 1024px) {
  .page-about .about-hero {
    padding-bottom: clamp(50px, 6vw, 88px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-node__stamp,
  .page-about .about-team__col,
  .page-about .about-flow__no,
  .page-about .about-principle,
  .page-about .about-node__aside,
  .page-about .about-node__body a {
    transition: none;
  }

  .page-about .about-node:hover .about-node__stamp,
  .page-about .about-team__col:hover {
    transform: none;
  }
}
<<<END>>>