.page-about {
  --about-rule: rgba(220, 207, 184, .14);
  --about-rule-strong: rgba(220, 207, 184, .28);
  --about-surface: #12141A;
  --about-card: #1B1E25;
  --about-card-open: #20242C;
  --about-gap: clamp(24px, 3vw, 40px);
  background: var(--ink-900);
  color: var(--text-100);
  padding-bottom: clamp(56px, 8vw, 112px);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(22px, 4vw, 44px) 0 clamp(28px, 4vw, 52px);
  border-bottom: 1px solid var(--about-rule);
}
.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: -1px;
  width: min(46%, 420px);
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--gold-500));
  opacity: .7;
}
.page-about .about-hero__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
}
.page-about .about-hero__vertical {
  margin: 0;
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .32em;
  color: var(--gold-500);
}
.page-about .about-hero__vertical::before {
  content: "";
  width: 30px;
  height: 1px;
  flex: none;
  background: var(--gold-500);
}
.page-about .about-hero__title {
  margin: 14px 0 18px;
  max-width: 20ch;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(32px, 6vw, 62px);
  line-height: 1.16;
  letter-spacing: -.02em;
  color: var(--text-100);
}
.page-about .about-hero__title em {
  font-style: normal;
  color: var(--gold-300);
}
.page-about .about-hero__intro {
  margin: 0 0 26px;
  max-width: 58ch;
  font-size: 16.5px;
  line-height: 1.9;
  color: var(--mist-300);
}
.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: 48px minmax(0, 1fr);
    gap: 44px;
    align-items: start;
  }
  .page-about .about-hero__vertical {
    display: block;
    writing-mode: vertical-rl;
    letter-spacing: .46em;
    padding-left: 14px;
    border-left: 1px solid var(--line-gold);
    line-height: 1;
  }
  .page-about .about-hero__vertical::before { display: none; }
}

/* ---------- 主体双栏 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 52px);
  padding-top: clamp(32px, 5vw, 64px);
}
@media (min-width: 1000px) {
  .page-about .about-body {
    grid-template-columns: 248px minmax(0, 1fr);
    align-items: start;
  }
  .page-about .about-index {
    position: sticky;
    top: 96px;
  }
}

/* ---------- 侧栏索引 ---------- */
.page-about .about-index__label,
.page-about .about-figures__label {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .28em;
  color: var(--mist-500);
}
.page-about .about-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}
.page-about .about-index__list a {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 10px 9px 13px;
  font-size: 14px;
  color: var(--mist-300);
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: color .3s var(--ease), border-color .3s var(--ease), background .3s var(--ease);
}
.page-about .about-index__list a:hover,
.page-about .about-index__list a:focus-visible {
  color: var(--text-100);
  border-left-color: var(--cinnabar-600);
  background: rgba(196, 58, 43, .08);
}
.page-about .about-index__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--gold-500);
  flex: none;
}
.page-about .about-figures {
  margin-top: 26px;
  padding-top: 20px;
  border-top: 1px solid var(--line-gold);
}
.page-about .about-figures__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}
.page-about .about-figures__list li {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding-bottom: 10px;
  border-bottom: 1px dashed var(--about-rule);
}
.page-about .about-figures__num {
  font-family: var(--font-mono);
  font-size: 24px;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--gold-300);
}
.page-about .about-figures__txt {
  font-size: 13px;
  color: var(--mist-500);
}

/* ---------- 章节面板 ---------- */
.page-about .about-flow {
  display: grid;
  gap: clamp(22px, 3vw, 38px);
  min-width: 0;
}
.page-about .about-section {
  position: relative;
  padding: clamp(20px, 3.2vw, 38px);
  background: var(--about-surface);
  border: 1px solid var(--about-rule);
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, 0 100%);
  min-width: 0;
}
.page-about .about-section__head {
  display: grid;
  gap: 10px;
  margin-bottom: clamp(16px, 2.4vw, 26px);
}
.page-about .about-section__no {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .26em;
  color: var(--gold-500);
}
.page-about .about-section__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(23px, 3.4vw, 34px);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -.01em;
  color: var(--cream-100);
}
.page-about .about-section__lede {
  margin: 0;
  max-width: 56ch;
  font-size: 15.5px;
  line-height: 1.9;
  color: var(--mist-300);
}

/* ---------- 引言与分栏 ---------- */
.page-about .about-quote {
  margin: 0 0 clamp(18px, 2.4vw, 26px);
  padding: 10px 0 10px 20px;
  border-left: 2px solid var(--cinnabar-600);
  font-family: var(--font-display);
  font-size: clamp(17px, 2.3vw, 23px);
  line-height: 1.65;
  color: var(--cream-100);
}
.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
  min-width: 0;
}
@media (min-width: 760px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    gap: var(--about-gap);
    align-items: start;
  }
  .page-about .about-split--flow {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    margin-top: 26px;
  }
  .page-about .about-split--coverage {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, .8fr);
    margin-top: 24px;
  }
}
.page-about .about-split__text p {
  margin: 0 0 14px;
  max-width: 62ch;
  font-size: 15.8px;
  line-height: 1.95;
  color: var(--text-100);
}
.page-about .about-split__text p:last-child { margin-bottom: 0; }
.page-about .about-split__text a {
  color: var(--gold-300);
  text-decoration: none;
  border-bottom: 1px solid var(--line-gold);
  transition: color .25s var(--ease), border-color .25s var(--ease);
}
.page-about .about-split__text a:hover,
.page-about .about-split__text a:focus-visible {
  color: var(--cinnabar-400);
  border-bottom-color: var(--cinnabar-400);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 0;
  min-width: 0;
}
.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border: 1px solid var(--about-rule-strong);
  background: var(--about-card);
}
.page-about .about-figure figcaption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.75;
  letter-spacing: .02em;
  color: var(--mist-500);
}

/* ---------- 三条准则 ---------- */
.page-about .principles {
  display: grid;
  gap: 12px;
}
.page-about .principle {
  background: var(--about-card);
  border: 1px solid var(--about-rule-strong);
  border-left: 3px solid transparent;
  transition: border-color .3s var(--ease), background .3s var(--ease);
}
.page-about .principle[open] {
  border-left-color: var(--cinnabar-600);
  background: var(--about-card-open);
}
.page-about .principle__summary {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 15px 16px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-size: 16.5px;
  line-height: 1.5;
  color: var(--cream-100);
  transition: color .25s var(--ease);
}
.page-about .principle__summary::-webkit-details-marker { display: none; }
.page-about .principle__summary::marker { content: ""; }
.page-about .principle__summary:hover { color: var(--gold-300); }
.page-about .principle__no {
  flex: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--gold-500);
}
.page-about .principle__title { min-width: 0; }
.page-about .principle__arrow {
  margin-left: auto;
  flex: none;
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--mist-500);
}
.page-about .principle__arrow::before { content: "＋"; }
.page-about .principle[open] .principle__arrow::before {
  content: "－";
  color: var(--cinnabar-400);
}
.page-about .principle__body {
  padding: 0 16px 18px;
  border-top: 1px dashed var(--about-rule);
  padding-top: 14px;
  margin-top: 2px;
}
.page-about .principle__body p {
  margin: 0 0 10px;
  font-size: 14.8px;
  line-height: 1.9;
  color: var(--mist-300);
}
.page-about .principle__body p:last-child { margin-bottom: 0; }

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}
@media (min-width: 640px) {
  .page-about .team-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
.page-about .team-card {
  padding: 16px 16px 18px;
  background: var(--about-card);
  border-top: 2px solid var(--line-gold);
  min-width: 0;
}
.page-about .team-card__name {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  color: var(--gold-300);
}
.page-about .team-card__text {
  margin: 0;
  font-size: 14.8px;
  line-height: 1.9;
  color: var(--mist-300);
}

/* ---------- 流程步骤 ---------- */
.page-about .flow-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  min-width: 0;
}
.page-about .flow-step {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 12px;
  padding: 14px 0;
  border-top: 1px dashed var(--about-rule);
}
.page-about .flow-step:first-child { border-top: 1px solid var(--line-gold); }
.page-about .flow-step__no {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--gold-500);
  padding-top: 3px;
}
.page-about .flow-step__title {
  margin: 0 0 4px;
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 600;
  color: var(--cream-100);
}
.page-about .flow-step__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--mist-300);
}

/* ---------- 发展阶段 ---------- */
.page-about .path {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}
@media (min-width: 860px) {
  .page-about .path { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; }
  .page-about .path__card::after {
    content: "";
    position: absolute;
    top: 46px;
    right: -18px;
    width: 18px;
    height: 1px;
    background: var(--gold-500);
    transform: rotate(-30deg);
    opacity: .55;
  }
  .page-about .path__card:last-child::after { display: none; }
}
.page-about .path__card {
  position: relative;
  padding: 20px 18px 22px;
  background: var(--about-card);
  border: 1px solid var(--about-rule);
  min-width: 0;
  transition: transform .35s var(--ease), border-color .35s var(--ease);
}
.page-about .path__card:hover,
.page-about .path__card:focus-within {
  transform: translateY(-4px);
  border-color: var(--line-gold);
}
.page-about .path__stage {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--cinnabar-400);
}
.page-about .path__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--cream-100);
}
.page-about .path__text {
  margin: 0 0 16px;
  font-size: 14.8px;
  line-height: 1.9;
  color: var(--mist-300);
}
.page-about .path__meta {
  margin: 0;
  padding-top: 12px;
  border-top: 1px solid var(--about-rule);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .06em;
  color: var(--gold-500);
}

/* ---------- 服务覆盖数字 ---------- */
.page-about .coverage-figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--about-rule);
  border: 1px solid var(--about-rule);
}
@media (min-width: 720px) {
  .page-about .coverage-figures { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}
.page-about .coverage-figure {
  background: var(--about-surface);
  padding: 16px 14px;
  min-width: 0;
}
.page-about .coverage-figure__num {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: clamp(22px, 4vw, 28px);
  line-height: 1.1;
  letter-spacing: -.02em;
  color: var(--gold-300);
}
.page-about .coverage-figure__unit {
  margin-left: 3px;
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--mist-500);
}
.page-about .coverage-figure__label {
  display: block;
  font-size: 13px;
  line-height: 1.65;
  color: var(--mist-300);
}

/* ---------- 认可与改进 ---------- */
.page-about .recognition-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}
.page-about .recognition-list li {
  position: relative;
  padding: 0 0 12px 22px;
  border-bottom: 1px dashed var(--about-rule);
  font-size: 15px;
  line-height: 1.9;
  color: var(--text-100);
}
.page-about .recognition-list li::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 11px;
  width: 7px;
  height: 7px;
  background: var(--gold-500);
  transform: rotate(45deg);
}
.page-about .about-cta {
  margin-top: clamp(20px, 3vw, 30px);
  padding: clamp(20px, 3vw, 30px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
  align-items: center;
  background: linear-gradient(140deg, rgba(196, 58, 43, .2), var(--about-surface) 62%);
  border: 1px solid var(--line-gold);
}
@media (min-width: 760px) {
  .page-about .about-cta { grid-template-columns: minmax(0, 1fr) auto; }
}
.page-about .about-cta__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: clamp(18px, 2.4vw, 22px);
  font-weight: 700;
  line-height: 1.4;
  color: var(--cream-100);
}
.page-about .about-cta__text {
  margin: 0;
  max-width: 56ch;
  font-size: 14.5px;
  line-height: 1.9;
  color: var(--mist-300);
}
.page-about .about-cta__text a {
  color: var(--gold-300);
  text-decoration: none;
  border-bottom: 1px solid var(--line-gold);
}
.page-about .about-cta__text a:hover,
.page-about .about-cta__text a:focus-visible {
  color: var(--cinnabar-400);
  border-bottom-color: var(--cinnabar-400);
}
.page-about .about-cta .btn {
  justify-self: start;
  white-space: nowrap;
}
@media (min-width: 760px) {
  .page-about .about-cta .btn { justify-self: end; }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .path__card,
  .page-about .principle,
  .page-about .about-index__list a {
    transition: none;
  }
  .page-about .path__card:hover,
  .page-about .path__card:focus-within {
    transform: none;
  }
}
<<<END>>>