.page-about {
  --about-rail: 300px;
  background: var(--moonw);
  color: var(--ink);
  font-family: var(--font-body);
  line-height: 1.75;
}

.page-about .breadcrumb {
  margin-top: clamp(14px, 3vw, 26px);
  font-size: 14px;
  color: var(--silver);
}

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

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

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

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  margin-top: clamp(12px, 2vw, 20px);
  padding: clamp(26px, 5vw, 52px) 0 clamp(30px, 5vw, 60px);
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(120% 90% at 92% 0%, rgba(217, 228, 236, 0.8), rgba(217, 228, 236, 0) 58%),
    radial-gradient(90% 80% at 4% 100%, rgba(169, 196, 192, 0.3), rgba(169, 196, 192, 0) 62%);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  align-items: center;
}

.page-about .about-hero__text h1 {
  margin: 12px 0 16px;
  font-family: var(--font-display);
  font-size: clamp(28px, 4.6vw, 40px);
  line-height: 1.2;
  letter-spacing: -0.01em;
  font-weight: 700;
}

.page-about .about-hero__lead {
  margin: 0 0 20px;
  max-width: 34em;
  font-size: clamp(15px, 1.6vw, 17px);
  color: rgba(23, 38, 61, 0.86);
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 0 0 24px;
  padding: 0;
  display: grid;
  gap: 8px;
  font-size: 14px;
  color: var(--silver);
}

.page-about .about-hero__facts li {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding-left: 14px;
  position: relative;
}

.page-about .about-hero__facts li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--sand);
}

.page-about .about-hero__facts .mono {
  color: var(--sand-deep);
  font-size: 13px;
  letter-spacing: 0.04em;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-hero__figure {
  margin: 0;
}

.page-about .about-hero__figure .figure__frame {
  border: 1px solid var(--line);
  box-shadow: var(--shadow-2);
}

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

.page-about .figure__cap {
  margin-top: 10px;
  font-size: 13px;
  color: var(--silver);
  line-height: 1.6;
}

/* ---------- 分屏骨架 ---------- */
.page-about .about-shell {
  display: grid;
  gap: clamp(28px, 4vw, 40px);
  padding: clamp(30px, 5vw, 56px) 0 clamp(40px, 6vw, 72px);
}

/* ---------- 左栏 ---------- */
.page-about .about-rail__inner {
  border: 1px solid var(--line-soft);
  background: linear-gradient(180deg, rgba(234, 239, 236, 0.7), rgba(246, 247, 244, 0.4));
  padding: 20px 18px;
  border-radius: var(--r);
}

.page-about .about-rail__title {
  margin: 8px 0 14px;
  font-family: var(--font-display);
  font-size: 19px;
  line-height: 1.4;
  font-weight: 700;
}

.page-about .about-claims {
  list-style: none;
  margin: 0 0 22px;
  padding: 0;
}

.page-about .about-claims li {
  display: grid;
  grid-template-columns: 26px minmax(0, 1fr);
  gap: 10px;
  padding: 12px 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-claims__num {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--helan);
  padding-top: 2px;
}

.page-about .about-claims h3 {
  margin: 0 0 4px;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.page-about .about-claims p {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: rgba(23, 38, 61, 0.74);
}

.page-about .about-toc {
  display: grid;
  gap: 2px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
}

.page-about .about-toc .eyebrow {
  margin-bottom: 8px;
}

.page-about .about-toc a {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 8px 10px;
  font-size: 14px;
  color: var(--ink);
  text-decoration: none;
  border-left: 2px solid transparent;
  border-radius: 0 var(--r) var(--r) 0;
  transition: background var(--ease), border-color var(--ease), color var(--ease);
}

.page-about .about-toc a .mono {
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--silver);
}

.page-about .about-toc a:hover,
.page-about .about-toc a:focus-visible {
  background: var(--fog);
  border-left-color: var(--sand);
}

.page-about .about-toc a:hover .mono {
  color: var(--sand-deep);
}

/* ---------- 右栏章节 ---------- */
.page-about .about-sec {
  margin-bottom: clamp(36px, 6vw, 64px);
  scroll-margin-top: 20px;
}

.page-about .about-sec:last-of-type {
  margin-bottom: clamp(28px, 4vw, 40px);
}

.page-about .about-sec__head {
  margin-bottom: clamp(18px, 3vw, 28px);
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-sec__head h2 {
  margin: 10px 0 12px;
  font-family: var(--font-display);
  font-size: clamp(22px, 2.8vw, 28px);
  line-height: 1.32;
  letter-spacing: -0.01em;
  font-weight: 700;
}

.page-about .about-sec__lead {
  margin: 0;
  max-width: 40em;
  font-size: 15px;
  color: rgba(23, 38, 61, 0.78);
}

/* ---------- 数字控制台 ---------- */
.page-about .about-console {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.35);
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 16px 14px 14px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  transition: background var(--ease), box-shadow var(--ease);
}

.page-about .about-stat:hover,
.page-about .about-stat:focus-within {
  background: var(--fog);
  box-shadow: inset 3px 0 0 var(--sand);
}

.page-about .about-stat__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(26px, 3.4vw, 34px);
  line-height: 1.05;
  letter-spacing: 0.01em;
  color: var(--ink);
}

.page-about .about-stat__unit {
  margin-left: 3px;
  font-family: var(--font-body);
  font-size: 13px;
  color: var(--helan);
  letter-spacing: 0;
}

.page-about .about-stat__label {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.page-about .about-stat__note {
  font-size: 13px;
  line-height: 1.65;
  color: rgba(23, 38, 61, 0.7);
}

.page-about .about-stat__stamp {
  margin-top: 6px;
  padding-top: 8px;
  border-top: 1px dashed var(--line-soft);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--silver);
  transition: color var(--ease);
}

.page-about .about-stat:hover .about-stat__stamp {
  color: var(--sand-deep);
}

/* ---------- 整理四步 ---------- */
.page-about .about-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-about .about-step {
  position: relative;
  padding: 2px 0 2px 20px;
  border-left: 1px solid var(--line);
}

.page-about .about-step::before {
  content: "";
  position: absolute;
  left: -4px;
  top: 10px;
  width: 7px;
  height: 7px;
  background: var(--sand);
  border-radius: 1px;
}

.page-about .about-step__num {
  display: block;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--helan);
  margin-bottom: 4px;
}

.page-about .about-step h3 {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.page-about .about-step p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(23, 38, 61, 0.78);
}

/* ---------- 团队 ---------- */
.page-about .about-team-figure {
  margin: 0 0 22px;
}

.page-about .about-team-figure .figure__frame {
  border: 1px solid var(--line);
  box-shadow: var(--shadow-1);
}

.page-about .about-teams {
  display: grid;
  gap: 16px;
}

.page-about .about-team {
  padding: 16px 16px 18px;
  border: 1px solid var(--line-soft);
  border-top: 2px solid var(--helan);
  background: rgba(234, 239, 236, 0.42);
  transition: border-color var(--ease), transform var(--ease), box-shadow var(--ease);
}

.page-about .about-team:hover {
  border-top-color: var(--sand);
  transform: translateY(-1px);
  box-shadow: var(--shadow-1);
}

.page-about .about-team__count {
  display: inline-block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 24px;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--ink);
}

.page-about .about-team__count span {
  margin-left: 2px;
  font-family: var(--font-body);
  font-size: 12px;
  color: var(--silver);
}

.page-about .about-team h3 {
  margin: 8px 0 6px;
  font-size: 16px;
  font-weight: 700;
}

.page-about .about-team p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.72;
  color: rgba(23, 38, 61, 0.76);
}

/* ---------- 年表 ---------- */
.page-about .about-timeline-figure {
  margin: 0 0 24px;
}

.page-about .about-timeline-figure .figure__frame {
  border: 1px solid var(--line);
  background: linear-gradient(90deg, rgba(12, 23, 37, 0.06), rgba(217, 228, 236, 0.65));
}

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 18px;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 14px;
  bottom: 14px;
  width: 1px;
  background: linear-gradient(180deg, var(--helan-l), var(--moss));
}

.page-about .about-node {
  position: relative;
}

.page-about .about-node::before {
  content: "";
  position: absolute;
  left: -17px;
  top: 18px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--moonw);
  border: 1px solid var(--helan);
}

.page-about .about-node--now::before {
  background: var(--moss);
  border-color: var(--moss);
  box-shadow: 0 0 0 4px rgba(46, 107, 79, 0.12);
}

.page-about .about-node details {
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-node summary {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 12px 26px 12px 0;
  cursor: pointer;
  list-style: none;
  position: relative;
  transition: color var(--ease);
}

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

.page-about .about-node summary::after {
  content: "+";
  position: absolute;
  right: 2px;
  top: 12px;
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--sand-deep);
}

.page-about .about-node details[open] summary::after {
  content: "–";
}

.page-about .about-node summary:hover .about-node__title {
  color: var(--sand-deep);
}

.page-about .about-node__year {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--helan);
  min-width: 44px;
}

.page-about .about-node__title {
  font-size: 16px;
  font-weight: 700;
  letter-spacing: -0.01em;
  transition: color var(--ease);
}

.page-about .about-node__body {
  padding: 0 26px 14px 0;
}

.page-about .about-node__body p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(23, 38, 61, 0.78);
}

/* ---------- 维护动作 ---------- */
.page-about .about-ops {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
}

.page-about .about-op {
  padding: 16px 0 18px;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-op h3 {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 700;
  letter-spacing: -0.01em;
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.page-about .about-op h3::before {
  content: "";
  width: 6px;
  height: 6px;
  background: var(--helan);
  border-radius: 50%;
  flex: 0 0 auto;
}

.page-about .about-op p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(23, 38, 61, 0.78);
}

/* ---------- 收束 ---------- */
.page-about .about-cta {
  position: relative;
  padding: clamp(22px, 4vw, 34px);
  border-radius: var(--r);
  overflow: hidden;
  background:
    radial-gradient(90% 140% at 100% 0%, rgba(60, 110, 107, 0.55), rgba(60, 110, 107, 0) 62%),
    radial-gradient(70% 120% at 0% 100%, rgba(201, 155, 63, 0.22), rgba(201, 155, 63, 0) 60%),
    var(--night);
  color: var(--moonw);
  box-shadow: var(--shadow-2);
}

.page-about .about-cta__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: clamp(19px, 2.4vw, 24px);
  line-height: 1.35;
  letter-spacing: -0.01em;
  font-weight: 700;
}

.page-about .about-cta__text {
  margin: 0 0 18px;
  max-width: 38em;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(246, 247, 244, 0.82);
}

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

.page-about .about-cta .btn--ghost {
  color: var(--moonw);
  border-color: rgba(246, 247, 244, 0.34);
}

.page-about .about-cta .btn--ghost:hover {
  border-color: var(--sand);
  color: var(--moonw);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-stat__num {
    font-size: 30px;
  }

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

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

  .page-about .about-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 22px 24px;
  }

  .page-about .about-ops {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 28px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  }
}

@media (min-width: 980px) {
  .page-about .about-shell {
    grid-template-columns: minmax(240px, var(--about-rail)) minmax(0, 1fr);
    gap: clamp(32px, 4.5vw, 64px);
    align-items: start;
  }

  .page-about .about-rail__inner {
    position: sticky;
    top: 22px;
    padding: 22px 20px;
  }

  .page-about .about-hero__figure {
    margin-top: 6px;
  }
}

@media (min-width: 1100px) {
  .page-about .about-sec__head {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
  }

  .page-about .about-stat__note {
    min-height: 3.3em;
  }
}
<<<END>>>