.page-about {
  --about-rail: 168px;
  --about-gap: clamp(18px, 3.4vw, 48px);
}

/* ---------- 首屏框景 ---------- */
.page-about .about-hero {
  background-color: var(--ink-950);
  padding-block: calc(var(--header-h) + 24px) clamp(44px, 6vw, 84px);
  overflow: hidden;
}

.page-about .about-hero .breadcrumb {
  color: var(--fog-dark);
  margin-bottom: clamp(18px, 3vw, 28px);
}

.page-about .about-hero .breadcrumb a {
  color: var(--fog-dark);
}

.page-about .about-hero .breadcrumb a:hover {
  color: var(--orange-soft);
}

.page-about .about-hero .breadcrumb [aria-current="page"] {
  color: var(--paper);
}

.page-about .hero-frame {
  position: relative;
  border: 1px solid var(--line-dark-strong);
  padding: clamp(30px, 5vw, 62px) clamp(20px, 4vw, 56px) clamp(26px, 4vw, 48px);
}

.page-about .hero-frame::before {
  content: "";
  position: absolute;
  inset-inline: 1px;
  top: 1px;
  height: 8px;
  background-image: repeating-linear-gradient(90deg, var(--line-dark-strong) 0 1px, transparent 1px 26px);
}

.page-about .hero-corner {
  position: absolute;
  width: 14px;
  height: 14px;
  border: 2px solid var(--orange);
}

.page-about .hero-corner--tl { top: -1px; left: -1px; border-right: 0; border-bottom: 0; }
.page-about .hero-corner--tr { top: -1px; right: -1px; border-left: 0; border-bottom: 0; }
.page-about .hero-corner--bl { bottom: -1px; left: -1px; border-right: 0; border-top: 0; }
.page-about .hero-corner--br { bottom: -1px; right: -1px; border-left: 0; border-top: 0; }

.page-about .hero-title {
  margin: 18px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(34px, 7.4vw, 80px);
  line-height: 1.02;
  letter-spacing: -0.012em;
  color: var(--paper);
  max-width: 16em;
}

.page-about .hero-lead {
  margin: 24px 0 0;
  max-width: 54ch;
  font-size: 17px;
  line-height: 1.8;
  color: rgba(244, 238, 227, 0.78);
}

.page-about .hero-stats {
  margin: clamp(26px, 4vw, 44px) 0 0;
  padding: 20px 0 0;
  list-style: none;
  border-top: 1px solid var(--line-dark);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 12px;
}

.page-about .stat-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.4vw, 34px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--teal);
}

.page-about .stat-label {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--fog-dark);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-chapter {
  padding-block: clamp(48px, 7vw, 92px);
}

.page-about .about-grid {
  display: grid;
  gap: clamp(16px, 3vw, 26px);
}

.page-about .about-rail {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: center;
  column-gap: 14px;
  row-gap: 4px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line-paper);
}

.page-about .band--ink .about-rail {
  border-bottom-color: var(--line-dark);
}

.page-about .rail-num {
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 300;
  font-size: clamp(30px, 4.4vw, 52px);
  line-height: 1;
  letter-spacing: -0.04em;
  color: var(--orange);
}

.page-about .rail-label {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.24em;
  color: var(--fog);
}

.page-about .band--ink .rail-label {
  color: var(--fog-dark);
}

.page-about .rail-note {
  grid-column: 1 / -1;
  margin: 2px 0 0;
  font-size: 12px;
  line-height: 1.65;
  color: var(--fog);
}

.page-about .band--ink .rail-note {
  color: var(--fog-dark);
}

.page-about .section-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(25px, 4.2vw, 40px);
  line-height: 1.18;
  letter-spacing: -0.008em;
}

.page-about .band--paper .section-title { color: var(--ink-text); }
.page-about .band--ink .section-title { color: var(--paper); }

.page-about .body-lead {
  margin: 16px 0 0;
  max-width: 62ch;
  font-size: 17px;
  line-height: 1.8;
}

.page-about .band--paper .body-lead { color: rgba(16, 27, 36, 0.78); }
.page-about .band--ink .body-lead { color: rgba(244, 238, 227, 0.76); }

.page-about .prose {
  margin-top: 16px;
  max-width: 66ch;
}

.page-about .prose p {
  margin: 0 0 1.05em;
  font-size: 16.5px;
  line-height: 1.85;
}

.page-about .band--paper .prose p { color: rgba(16, 27, 36, 0.84); }

/* ---------- 01 品牌主张 ---------- */
.page-about .claim-strip {
  margin: clamp(24px, 4vw, 36px) 0 0;
  padding: 20px 0 0;
  list-style: none;
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  border-top: 1px solid var(--line-paper);
}

.page-about .claim-key {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--orange);
}

.page-about .claim-title {
  margin: 8px 0 6px;
  font-size: 16px;
  font-weight: 700;
  color: var(--ink-text);
}

.page-about .claim-text {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--fog);
}

/* ---------- 02 编辑台流程 ---------- */
.page-about .flow-scale {
  display: block;
  width: 100%;
  height: auto;
  margin: clamp(22px, 4vw, 32px) 0 10px;
  color: var(--line-dark-strong);
}

.page-about .flow-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
}

.page-about .flow-item {
  border-top: 2px solid var(--orange);
  padding-top: 16px;
}

.page-about .flow-step {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--orange-soft);
}

.page-about .flow-title {
  margin: 10px 0 8px;
  font-size: 18px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .flow-text {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: rgba(244, 238, 227, 0.72);
}

.page-about .desk-figure {
  margin: clamp(28px, 4vw, 42px) 0 0;
}

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

/* ---------- 03 发展阶段 ---------- */
.page-about .stage-layout {
  margin-top: clamp(24px, 4vw, 38px);
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 38px);
}

.page-about .stage-track {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .stage-track::before {
  content: "";
  position: absolute;
  left: 15px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: var(--paper-line);
}

.page-about .stage {
  position: relative;
  padding: 0 0 28px 48px;
}

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

.page-about .stage-node {
  position: absolute;
  left: 0;
  top: 1px;
  width: 31px;
  height: 31px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  border: 1px solid var(--paper-line);
  background: var(--paper);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--ink-text);
  transition: background 0.25s var(--ease), border-color 0.25s var(--ease), color 0.25s var(--ease), transform 0.25s var(--ease);
}

.page-about .stage:hover .stage-node,
.page-about .stage:focus-within .stage-node {
  background: var(--orange);
  border-color: var(--orange);
  color: #ffffff;
  transform: scale(1.06);
}

.page-about .stage-title {
  margin: 4px 0 8px;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 800;
  letter-spacing: 0.01em;
  color: var(--ink-text);
}

.page-about .stage-desc {
  margin: 0;
  max-width: 58ch;
  font-size: 15.5px;
  line-height: 1.85;
  color: rgba(16, 27, 36, 0.8);
}

.page-about .stage-desc a {
  color: var(--orange);
  border-bottom: 1px solid rgba(255, 91, 30, 0.4);
  text-decoration: none;
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease);
}

.page-about .stage-desc a:hover {
  color: var(--ink-text);
  border-bottom-color: var(--ink-text);
}

.page-about .stage-note {
  margin: 10px 0 0;
  padding-left: 0;
  border-left: 2px solid transparent;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.7;
  color: var(--fog);
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease), padding-left 0.25s var(--ease);
}

.page-about .stage:hover .stage-note,
.page-about .stage:focus-within .stage-note {
  color: var(--orange);
  border-left-color: var(--orange);
  padding-left: 10px;
}

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

/* ---------- 04 团队分工 ---------- */
.page-about .team-grid {
  margin-top: clamp(24px, 4vw, 38px);
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line-dark);
  border: 1px solid var(--line-dark);
}

.page-about .team-card {
  background: var(--ink-900);
  padding: 22px 20px 24px;
  transition: background 0.25s var(--ease);
}

.page-about .team-card:hover {
  background: var(--ink-800);
}

.page-about .team-chip {
  display: inline-block;
  margin: 0;
  padding: 4px 9px;
  border: 1px solid rgba(43, 240, 196, 0.35);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--teal);
}

.page-about .team-size {
  margin: 16px 0 0;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--fog-dark);
}

.page-about .team-size .num {
  margin-right: 5px;
  font-family: var(--font-mono);
  font-size: 34px;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--paper);
}

.page-about .team-duties {
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 8px;
}

.page-about .team-duties li {
  position: relative;
  padding-left: 14px;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(244, 238, 227, 0.7);
}

.page-about .team-duties li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 5px;
  height: 5px;
  background: var(--orange);
}

/* ---------- 05 数据来源 ---------- */
.page-about .source-list {
  margin: clamp(24px, 4vw, 38px) 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line-paper);
}

.page-about .source-item {
  display: grid;
  gap: 6px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line-paper);
}

.page-about .source-name {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  letter-spacing: 0.01em;
  color: var(--ink-text);
}

.page-about .source-name .num {
  margin-right: 4px;
  font-size: 21px;
  color: var(--orange);
}

.page-about .source-text {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(16, 27, 36, 0.74);
}

.page-about .source-text a {
  color: var(--orange);
  border-bottom: 1px solid rgba(255, 91, 30, 0.4);
  text-decoration: none;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

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

/* ---------- 06 服务覆盖 ---------- */
.page-about .reach-layout {
  margin-top: clamp(24px, 4vw, 38px);
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 4vw, 36px);
}

.page-about .reach-figure {
  margin: 0;
}

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

.page-about .reach-stats {
  margin: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px 18px;
}

.page-about .reach-stats div {
  border-top: 1px solid var(--line-dark);
  padding-top: 12px;
}

.page-about .reach-stats dt {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--fog-dark);
}

.page-about .reach-stats dd {
  margin: 8px 0 0;
  font-family: var(--font-mono);
  font-size: clamp(23px, 3vw, 30px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--teal);
}

.page-about .reach-actions {
  margin-top: clamp(24px, 4vw, 36px);
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 断点 ---------- */
@media (min-width: 620px) {
  .page-about .claim-strip {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 24px;
  }

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

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

  .page-about .flow-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 26px;
  }

  .page-about .source-item {
    grid-template-columns: 200px minmax(0, 1fr);
    gap: 6px 28px;
    align-items: baseline;
  }
}

@media (min-width: 900px) {
  .page-about .stage-layout {
    grid-template-columns: minmax(0, 1fr) minmax(0, 290px);
    align-items: start;
  }

  .page-about .reach-layout {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
    align-items: center;
  }
}

@media (min-width: 960px) {
  .page-about .about-grid {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: var(--about-gap);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h) + 18px);
    display: block;
    padding-bottom: 0;
    border-bottom: 0;
  }

  .page-about .rail-label {
    margin-top: 12px;
    writing-mode: vertical-rl;
    letter-spacing: 0.32em;
  }

  .page-about .rail-note {
    margin-top: 18px;
    max-width: 11em;
  }
}

@media (min-width: 1080px) {
  .page-about .team-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .stage-node,
  .page-about .stage-note,
  .page-about .team-card,
  .page-about .stage-desc a,
  .page-about .source-text a {
    transition: none;
  }

  .page-about .stage:hover .stage-node,
  .page-about .stage:focus-within .stage-node {
    transform: none;
  }
}
<<<END>>>