.page-about {
  background: var(--paper);
  color: var(--text);
  font-family: var(--font-body);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  background:
    radial-gradient(120% 90% at 10% 0%, rgba(184, 134, 59, 0.24) 0%, rgba(184, 134, 59, 0) 58%),
    linear-gradient(165deg, var(--ink) 0%, var(--ink-soft) 64%, var(--ink) 100%);
  color: var(--paper);
  padding: clamp(20px, 4vw, 30px) 0 clamp(36px, 6vw, 66px);
  border-bottom: 1px solid rgba(217, 164, 89, 0.28);
}

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

.page-about .about-crumb ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 0 4px;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
}

.page-about .about-crumb li {
  color: rgba(240, 228, 206, 0.5);
}

.page-about .about-crumb a {
  color: rgba(240, 228, 206, 0.66);
  text-decoration: none;
  transition: color 0.18s var(--ease);
}

.page-about .about-crumb a:hover,
.page-about .about-crumb a:focus-visible {
  color: var(--copper-bright);
}

.page-about .about-crumb li[aria-current] {
  color: var(--copper-bright);
}

.page-about .about-eyebrow {
  color: var(--copper-bright);
  margin: 0;
}

.page-about .about-h1 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(27px, 6.6vw, 54px);
  line-height: 1.16;
  letter-spacing: -0.02em;
  max-width: 17em;
}

.page-about .about-lede {
  margin: 0;
  max-width: 48em;
  font-size: clamp(15px, 3.6vw, 17px);
  line-height: 1.85;
  color: rgba(240, 228, 206, 0.79);
}

.page-about .about-stats {
  list-style: none;
  margin: 6px 0 0;
  padding: clamp(16px, 3vw, 22px) 0 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 14px;
  border-top: 1px solid rgba(217, 164, 89, 0.26);
}

.page-about .about-stats li {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .about-stat-num {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(24px, 5.6vw, 38px);
  line-height: 1.05;
  letter-spacing: -0.01em;
  color: var(--copper-bright);
}

.page-about .about-stat-pct {
  font-size: 0.62em;
}

.page-about .about-stat-label {
  font-size: 12.5px;
  line-height: 1.5;
  color: rgba(240, 228, 206, 0.66);
}

/* ---------- 索引轨道 + 内容流 ---------- */
.page-about .about-shell {
  padding-top: clamp(28px, 5vw, 60px);
  padding-bottom: clamp(28px, 5vw, 60px);
  display: grid;
  gap: 24px;
}

.page-about .about-rail {
  display: none;
}

.page-about .about-rail-head {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--text-soft);
}

.page-about .about-rail-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-left: 1px solid var(--line);
}

.page-about .about-rail-list li {
  margin: 0;
}

.page-about .about-rail-list .rail-link {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-left: -1px;
  padding: 9px 0 9px 15px;
  border-left: 1px solid transparent;
  color: var(--text-soft);
  text-decoration: none;
  font-size: 14px;
  line-height: 1.5;
  transition: color 0.18s var(--ease);
}

.page-about .about-rail-num {
  flex: none;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--copper);
  opacity: 0.75;
  transition: opacity 0.18s var(--ease);
}

.page-about .about-rail-list .rail-link::before {
  content: "";
  position: absolute;
  left: -1px;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--copper);
  transform: scaleY(0);
  transform-origin: top center;
  transition: transform 0.2s var(--ease);
}

.page-about .about-rail-list .rail-link:hover,
.page-about .about-rail-list .rail-link:focus-visible,
.page-about .about-rail-list .rail-link.is-active {
  color: var(--text);
}

.page-about .about-rail-list .rail-link:hover::before,
.page-about .about-rail-list .rail-link:focus-visible::before,
.page-about .about-rail-list .rail-link.is-active::before {
  transform: scaleY(1);
}

.page-about .about-rail-list .rail-link.is-active .about-rail-num {
  opacity: 1;
}

/* ---------- 章节 ---------- */
.page-about .about-body {
  min-width: 0;
}

.page-about .about-chapter {
  padding-bottom: clamp(28px, 4.4vw, 48px);
  scroll-margin-top: calc(var(--header-h) + 24px);
}

.page-about .about-chapter + .about-chapter {
  border-top: 1px solid var(--line);
  padding-top: clamp(28px, 4.4vw, 48px);
}

.page-about .about-chapter-head {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.page-about .about-chapter-num {
  flex: none;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 12px;
  line-height: 1;
  letter-spacing: 0.08em;
  color: var(--copper);
  border: 1px solid var(--copper);
  border-radius: 2px;
  padding: 3px 7px;
}

.page-about .about-chapter-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(19px, 4.2vw, 28px);
  line-height: 1.35;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .about-lead {
  margin: 0 0 clamp(18px, 3vw, 26px);
  padding-left: 14px;
  border-left: 2px solid var(--copper);
  font-size: clamp(15px, 3.6vw, 17px);
  line-height: 1.8;
  color: var(--ink);
}

.page-about .about-prose {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--text-soft);
}

.page-about .about-prose:last-child {
  margin-bottom: 0;
}

.page-about .about-prose a {
  color: var(--ink);
  text-decoration: none;
  background-image: linear-gradient(var(--copper), var(--copper));
  background-repeat: no-repeat;
  background-position: 0 100%;
  background-size: 0 2px;
  padding-bottom: 1px;
  transition: background-size 0.2s var(--ease), color 0.2s var(--ease);
}

.page-about .about-prose a:hover,
.page-about .about-prose a:focus-visible {
  color: var(--copper);
  background-size: 100% 2px;
}

.page-about .about-split {
  display: grid;
  gap: 20px;
}

/* ---------- 三条业务线 ---------- */
.page-about .about-bands {
  display: grid;
  gap: 10px;
  align-content: start;
}

.page-about .about-band {
  padding: 14px 16px 16px;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: var(--paper-light);
  transition: border-color 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .about-band:hover {
  border-color: var(--copper);
  transform: translateX(2px);
}

.page-about .about-band--copper {
  background: linear-gradient(135deg, rgba(184, 134, 59, 0.18) 0%, rgba(217, 164, 89, 0.05) 100%);
  border-color: rgba(184, 134, 59, 0.42);
}

.page-about .about-band--ink {
  background: var(--ink);
  border-color: var(--ink-soft);
  color: var(--paper);
}

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

.page-about .about-band-top {
  display: flex;
  align-items: baseline;
  gap: 5px;
}

.page-about .about-band-count {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 32px;
  line-height: 1;
  color: var(--copper);
}

.page-about .about-band--ink .about-band-count {
  color: var(--copper-bright);
}

.page-about .about-band-unit {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-soft);
}

.page-about .about-band--ink .about-band-unit {
  color: rgba(240, 228, 206, 0.66);
}

.page-about .about-band-role {
  margin: 8px 0 6px;
  font-family: var(--font-display);
  font-size: 17px;
  line-height: 1.4;
}

.page-about .about-band-text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--text-soft);
}

.page-about .about-band--ink .about-band-text {
  color: rgba(240, 228, 206, 0.78);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-about .about-figure img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
  border-radius: 5px;
  border: 1px solid var(--line);
}

.page-about .about-figure figcaption {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.04em;
  line-height: 1.6;
  color: var(--text-soft);
}

/* ---------- 覆盖 ---------- */
.page-about .about-places {
  list-style: none;
  margin: 0 0 14px;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .about-places li {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.04em;
  padding: 5px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--paper-light);
  color: var(--text-soft);
}

.page-about .about-places li:first-child {
  border-color: rgba(184, 134, 59, 0.55);
  color: var(--copper);
  background: rgba(184, 134, 59, 0.08);
}

/* ---------- 四段式交付 ---------- */
.page-about .about-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-step {
  background: var(--paper-light);
  border: 1px solid var(--line);
  border-left: 3px solid var(--copper);
  border-radius: 4px;
  padding: 14px 16px 15px;
  transition: border-color 0.2s var(--ease), box-shadow 0.2s var(--ease);
}

.page-about .about-step:hover {
  box-shadow: 0 8px 20px -14px rgba(14, 23, 33, 0.55);
}

.page-about .about-step-num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--copper);
}

.page-about .about-step-title {
  margin: 6px 0 6px;
  font-family: var(--font-display);
  font-size: 17px;
  line-height: 1.4;
}

.page-about .about-step-text {
  margin: 0 0 10px;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--text-soft);
}

.page-about .about-step-meta {
  margin: 0;
  padding-top: 8px;
  border-top: 1px dashed var(--line);
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.7;
  color: var(--text-soft);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 26px;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 6px;
  bottom: 6px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--copper) 0%, rgba(184, 134, 59, 0.4) 32%, var(--line) 100%);
}

.page-about .about-tl-item {
  position: relative;
  padding-bottom: 24px;
}

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

.page-about .about-tl-item::before {
  content: "";
  position: absolute;
  left: -25px;
  top: 6px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--paper);
  border: 2px solid var(--copper);
  transition: background-color 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .about-tl-item:hover::before {
  background: var(--copper);
  transform: scale(1.25);
}

.page-about .about-tl-item--media::before {
  display: none;
}

.page-about .about-tl-item--media {
  padding-bottom: 24px;
}

.page-about .about-tl-year {
  margin: 0 0 4px;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--copper);
}

.page-about .about-tl-title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 17.5px;
  line-height: 1.4;
}

.page-about .about-tl-text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--text-soft);
}

.page-about .about-tl-deliver {
  list-style: none;
  margin: 10px 0 0;
  padding: 9px 12px;
  display: grid;
  gap: 4px;
  background: var(--paper-light);
  border: 1px solid var(--line);
  border-radius: 4px;
  transition: border-color 0.2s var(--ease), background-color 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .about-tl-item:hover .about-tl-deliver,
.page-about .about-tl-item:focus-within .about-tl-deliver {
  border-color: rgba(184, 134, 59, 0.65);
  background: var(--paper);
  transform: translateX(2px);
}

.page-about .about-tl-deliver li {
  position: relative;
  padding-left: 11px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  line-height: 1.7;
  color: var(--text-soft);
}

.page-about .about-tl-deliver li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.65em;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--copper);
}

/* ---------- 持续支持 ---------- */
.page-about .about-support-stats {
  list-style: none;
  margin: 0 0 20px;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: 5px;
  overflow: hidden;
}

.page-about .about-support-stats li {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: 13px 14px 15px;
  background: var(--paper-light);
}

.page-about .about-support-num {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(21px, 4.8vw, 30px);
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--ink);
}

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

.page-about .about-support-label {
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--text-soft);
}

/* ---------- 收束 ---------- */
.page-about .about-cta {
  background: linear-gradient(150deg, var(--ink-soft) 0%, var(--ink) 100%);
  color: var(--paper);
  border-top: 1px solid rgba(217, 164, 89, 0.3);
  padding: clamp(34px, 6vw, 64px) 0;
}

.page-about .about-cta-inner {
  display: grid;
  gap: 22px;
}

.page-about .about-cta-title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(21px, 4.4vw, 32px);
  line-height: 1.32;
  letter-spacing: -0.01em;
}

.page-about .about-cta-text {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(240, 228, 206, 0.76);
}

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

.page-about .about-cta-actions .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 22px;
  font-size: 14.5px;
  text-decoration: none;
  border-radius: 3px;
  text-align: center;
  transition: background-color 0.2s var(--ease), border-color 0.2s var(--ease), color 0.2s var(--ease);
}

.page-about .about-cta .btn--line {
  color: var(--paper);
  border: 1px solid rgba(217, 164, 89, 0.6);
  background: transparent;
}

.page-about .about-cta .btn--line:hover,
.page-about .about-cta .btn--line:focus-visible {
  color: var(--copper-bright);
  border-color: var(--copper-bright);
  background: rgba(217, 164, 89, 0.08);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 14px;
  }
}

@media (min-width: 720px) {
  .page-about .about-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
  }

  .page-about .about-support-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-cta-actions {
    justify-content: flex-start;
  }
}

@media (min-width: 860px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.82fr);
    gap: 32px;
    align-items: start;
  }

  .page-about .about-cta-inner {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    align-items: center;
    gap: 40px;
  }

  .page-about .about-cta-actions {
    justify-content: flex-end;
  }
}

@media (min-width: 1000px) {
  .page-about .about-shell {
    grid-template-columns: 208px minmax(0, 1fr);
    column-gap: clamp(34px, 4vw, 62px);
    align-items: start;
  }

  .page-about .about-rail {
    display: block;
    position: sticky;
    top: calc(var(--header-h) + 28px);
  }

  .page-about .about-timeline {
    padding-left: 30px;
  }
}
<<<END>>>