.page-about {
  --about-col: 168px;
  --about-gap: 40px;
  background: var(--paper);
  color: var(--ink);
}

.page-about .breadcrumb {
  padding: 14px 0 12px;
  font-size: 13px;
  color: var(--gray);
}

.page-about .breadcrumb a {
  color: var(--charcoal);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

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

.page-about .breadcrumb__sep {
  margin: 0 8px;
  color: var(--rule);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background: var(--night);
  color: var(--white);
  padding: 34px 0 44px;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(251, 252, 253, 0.14) 1px, transparent 1px);
  background-size: 20px 20px;
  opacity: 0.45;
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 8px;
  background: repeating-linear-gradient(120deg, var(--red) 0 10px, transparent 10px 26px);
  opacity: 0.9;
}

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

.page-about .about-hero__kicker {
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan);
  margin: 0 0 16px;
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 900;
  letter-spacing: -0.03em;
  font-size: clamp(28px, 7.2vw, 52px);
  line-height: 1.1;
  margin: 0 0 16px;
  max-width: 16em;
}

.page-about .about-hero__lead {
  color: var(--on-dark);
  font-size: 16px;
  line-height: 1.78;
  margin: 0 0 26px;
  max-width: 44em;
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 24px;
}

.page-about .about-hero__facts li {
  display: flex;
  align-items: baseline;
  gap: 8px;
  min-width: 118px;
  padding-top: 8px;
  border-top: 1px solid var(--hair-dark);
  font-size: 13px;
  color: var(--on-dark-dim);
}

.page-about .about-hero__facts .mono {
  font-family: var(--font-mono);
  font-size: 15px;
  letter-spacing: 0.04em;
  color: var(--cyan);
}

/* ---------- 节点轨道 ---------- */
.page-about .about-track {
  position: relative;
  padding-bottom: 8px;
}

.page-about .about-node {
  position: relative;
  padding: 28px 0;
  border-top: 1px solid var(--rule);
}

.page-about .about-node:first-child {
  border-top: 0;
}

.page-about .about-node__meta {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 14px;
}

.page-about .about-node__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--red);
}

.page-about .about-node__label {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--gray);
}

.page-about .about-node__body h2 {
  font-family: var(--font-display);
  font-weight: 900;
  letter-spacing: -0.025em;
  font-size: 23px;
  line-height: 1.24;
  margin: 0 0 14px;
  color: var(--ink);
}

.page-about .about-node__body > p {
  margin: 0 0 14px;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--charcoal);
}

.page-about .about-node__body .mono {
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
}

/* ---------- 图 ---------- */
.page-about .about-figure {
  margin: 0;
  background: var(--white);
  border: 1px solid var(--rule);
  clip-path: var(--cut);
  overflow: hidden;
}

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

.page-about .about-figure figcaption {
  padding: 10px 14px 12px;
  border-top: 1px solid var(--rule-soft);
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--gray);
}

.page-about .about-figure--wide {
  margin: 4px 0 22px;
}

/* ---------- 三条线索 ---------- */
.page-about .about-why {
  display: grid;
  gap: 22px;
}

.page-about .about-lines {
  list-style: none;
  margin: 6px 0 18px;
  padding: 0;
  display: grid;
  gap: 4px;
}

.page-about .about-lines li {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
  padding: 11px 0;
  border-top: 1px solid var(--rule-soft);
}

.page-about .about-lines li p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--charcoal);
}

.page-about .about-lines__tag {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--red);
  padding-top: 2px;
}

/* ---------- 流程步骤 ---------- */
.page-about .about-steps {
  display: grid;
  gap: 12px;
}

.page-about .about-step {
  background: var(--white);
  border: 1px solid var(--rule);
  border-left: 3px solid var(--red);
  clip-path: var(--cut-sm);
}

.page-about .about-step summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 13px 16px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 15.5px;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .about-step summary::-webkit-details-marker {
  display: none;
}

.page-about .about-step summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 16px;
  color: var(--red);
}

.page-about .about-step[open] summary::after {
  content: "−";
}

.page-about .about-step__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--gray);
}

.page-about .about-step__body {
  padding: 0 16px 16px;
}

.page-about .about-step__body > p {
  margin: 0 0 10px;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--charcoal);
}

.page-about .about-step__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--gray);
  margin: 0 0 6px;
}

.page-about .about-step__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 6px;
}

.page-about .about-step__list li {
  position: relative;
  padding-left: 16px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--charcoal);
}

.page-about .about-step__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 7px;
  height: 1px;
  background: var(--orange);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: 14px;
  margin-bottom: 4px;
}

.page-about .about-team__card {
  background: var(--white);
  border: 1px solid var(--rule);
  padding: 18px 16px 16px;
  clip-path: var(--cut);
}

.page-about .about-team__count {
  display: block;
  font-family: var(--font-mono);
  font-size: 30px;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--red);
  margin-bottom: 10px;
}

.page-about .about-team__card h3 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 17px;
  letter-spacing: -0.015em;
  margin: 0 0 8px;
  color: var(--ink);
}

.page-about .about-team__card p {
  margin: 0 0 10px;
  font-size: 14px;
  line-height: 1.72;
  color: var(--charcoal);
}

.page-about .about-team__card .about-team__duty {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.05em;
  color: var(--gray);
}

/* ---------- 历程 ---------- */
.page-about .about-stages {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-stages::before {
  content: "";
  position: absolute;
  left: 12px;
  top: 16px;
  bottom: 16px;
  width: 1px;
  background: var(--rule);
}

.page-about .about-stage {
  display: grid;
  grid-template-columns: 26px minmax(0, 1fr);
  gap: 12px;
  padding: 6px 0;
}

.page-about .about-stage__dot {
  position: relative;
  z-index: 1;
  width: 9px;
  height: 9px;
  margin: 15px auto 0;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 4px var(--paper);
  animation: about-breathe 3s ease-in-out infinite;
}

.page-about .about-stage__dot--pending {
  background: var(--orange);
}

.page-about .about-stage__card {
  background: var(--white);
  border: 1px solid var(--rule-soft);
  border-left: 2px solid var(--cyan);
  padding: 12px 14px 14px;
  clip-path: var(--cut-sm);
}

.page-about .about-stage--pending .about-stage__card {
  border-left-color: var(--orange);
}

.page-about .about-stage__head {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 6px;
}

.page-about .about-stage__head .mono {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.05em;
  color: var(--gray);
}

.page-about .about-stage__head h3 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 15.5px;
  letter-spacing: -0.01em;
  margin: 0;
  color: var(--ink);
}

.page-about .about-stage__state {
  margin-left: auto;
  padding: 2px 7px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--ink);
  background: var(--cyan-soft);
}

.page-about .about-stage--pending .about-stage__state {
  background: var(--orange-soft);
}

.page-about .about-stage__card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--charcoal);
}

/* ---------- 反馈流程 ---------- */
.page-about .about-flow {
  list-style: none;
  margin: 18px 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-flow li {
  background: var(--white);
  border: 1px solid var(--rule);
  padding: 14px 16px;
  clip-path: var(--cut-sm);
}

.page-about .about-flow li .mono {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--red);
}

.page-about .about-flow li h3 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 15.5px;
  letter-spacing: -0.01em;
  margin: 0 0 6px;
  color: var(--ink);
}

.page-about .about-flow li p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--charcoal);
}

.page-about .about-cta {
  margin: 4px 0 0;
}

/* ---------- 数字 ---------- */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: 6px;
}

.page-about .about-stat {
  background: var(--night);
  color: var(--white);
  padding: 16px 15px 18px;
  clip-path: var(--cut);
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 32px;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--white);
}

.page-about .about-stat__num em {
  font-style: normal;
  font-size: 13px;
  color: var(--cyan);
  margin-left: 3px;
}

.page-about .about-stat__label {
  display: block;
  margin-top: 8px;
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--on-dark);
}

.page-about .about-stat__note {
  margin: 8px 0 0;
  font-size: 12px;
  line-height: 1.6;
  color: var(--on-dark-dim);
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  margin: 34px 0 48px;
  background: var(--white);
  border: 1px solid var(--rule);
  border-top: 3px solid var(--red);
  padding: 22px 18px 24px;
  clip-path: var(--cut);
}

.page-about .about-next h2 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 20px;
  letter-spacing: -0.02em;
  line-height: 1.3;
  margin: 0 0 8px;
  color: var(--ink);
}

.page-about .about-next p {
  margin: 0 0 16px;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--charcoal);
}

.page-about .about-next__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

@keyframes about-breathe {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.55; }
}

/* ---------- 断点 ---------- */
@media (min-width: 760px) {
  .page-about .about-flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
  }
}

@media (min-width: 820px) {
  .page-about .about-why {
    grid-template-columns: minmax(0, 1fr) 300px;
    gap: 32px;
    align-items: start;
  }

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

  .page-about .about-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 14px;
  }

  .page-about .about-stat {
    padding: 18px 16px 20px;
  }

  .page-about .about-stat__num {
    font-size: 44px;
  }

  .page-about .about-next {
    padding: 26px 24px 28px;
  }
}

@media (hover: hover) and (min-width: 820px) {
  .page-about .about-stat__note {
    max-height: 0;
    margin-top: 0;
    opacity: 0;
    overflow: hidden;
    transition: max-height 0.32s var(--ease), opacity 0.26s var(--ease), margin-top 0.32s var(--ease);
  }

  .page-about .about-stat:hover .about-stat__note {
    max-height: 130px;
    margin-top: 8px;
    opacity: 1;
  }
}

@media (min-width: 900px) {
  .page-about .about-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
    margin-bottom: 22px;
  }

  .page-about .about-step:nth-child(even) {
    transform: translateY(18px);
  }
}

@media (min-width: 960px) {
  .page-about .about-track::before {
    content: "";
    position: absolute;
    top: 20px;
    bottom: 32px;
    left: calc(var(--about-col) + var(--about-gap) / 2);
    width: 1px;
    background: linear-gradient(to bottom, transparent, var(--rule) 4%, var(--rule) 96%, transparent);
  }

  .page-about .about-node {
    display: grid;
    grid-template-columns: var(--about-col) minmax(0, 1fr);
    column-gap: var(--about-gap);
    padding: 52px 0;
  }

  .page-about .about-node__meta {
    display: block;
    margin: 0;
    position: relative;
  }

  .page-about .about-node__num {
    display: block;
    font-size: 13px;
    margin-bottom: 8px;
  }

  .page-about .about-node__label {
    display: block;
    font-size: 15px;
    line-height: 1.3;
    letter-spacing: 0.06em;
    color: var(--charcoal);
  }

  .page-about .about-node__meta::after {
    content: "";
    position: absolute;
    top: 2px;
    right: -21px;
    width: 10px;
    height: 10px;
    background: var(--red);
    transform: rotate(45deg);
  }

  .page-about .about-node__body h2 {
    font-size: 30px;
    margin-bottom: 16px;
  }

  .page-about .about-node__body > p {
    font-size: 16px;
  }

  .page-about .about-hero {
    padding: 48px 0 56px;
  }

  .page-about .about-hero__facts {
    gap: 12px 34px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-stage__dot {
    animation: none;
  }

  .page-about .about-step:nth-child(even) {
    transform: none;
  }

  .page-about .about-stat__note {
    transition: none;
  }
}
<<<END>>>