.page-about {
  background: var(--inkblue);
  color: var(--paper);
  font-family: var(--font-body);
  font-size: var(--fs-16);
  line-height: 1.75;
  overflow-x: clip;
}

.page-about p {
  margin: 0 0 1em;
}

.page-about a {
  color: var(--gold-lit);
  text-decoration: none;
  border-bottom: 1px solid rgba(200, 160, 74, 0.5);
  transition: color 160ms ease, border-color 160ms ease;
}

.page-about a:hover,
.page-about a:focus-visible {
  color: var(--cinnabar-lit);
  border-bottom-color: var(--cinnabar-lit);
}

.page-about .about-crumb {
  padding-top: clamp(18px, 3vw, 28px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: clamp(26px, 4.5vw, 56px) 0 clamp(52px, 8vw, 104px);
  background:
    radial-gradient(120% 90% at 88% 0%, rgba(200, 160, 74, 0.16), transparent 62%),
    var(--inkblue);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
}

.page-about .about-hero__rail {
  display: flex;
  flex-direction: column;
  gap: 16px;
  border-top: 1px solid rgba(200, 160, 74, 0.4);
  padding-top: 14px;
}

.page-about .about-label {
  display: inline-block;
  font-size: var(--fs-12);
  letter-spacing: 0.26em;
  color: var(--gold);
  line-height: 1.2;
}

.page-about .about-toc {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px 6px;
}

.page-about .about-toc a {
  display: block;
  padding: 8px 8px 8px 12px;
  font-size: var(--fs-14);
  color: rgba(243, 237, 224, 0.72);
  border: 0;
  border-left: 2px solid rgba(200, 160, 74, 0.28);
  transition: color 160ms ease, border-color 160ms ease, background 160ms ease;
}

.page-about .about-toc a:hover,
.page-about .about-toc a:focus-visible {
  color: var(--gold-lit);
  border-left-color: var(--gold-lit);
  background: rgba(200, 160, 74, 0.1);
}

.page-about .about-toc a[aria-current="true"] {
  color: var(--gold-lit);
  border-left-color: var(--cinnabar);
  background: rgba(200, 160, 74, 0.12);
}

.page-about .about-hero__main {
  max-width: 66ch;
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.1rem, 6vw, 4rem);
  line-height: 1.16;
  letter-spacing: 0.01em;
  color: var(--paper);
  margin: 16px 0 20px;
}

.page-about .about-hero__lead {
  max-width: 54ch;
  font-size: var(--fs-17);
  line-height: 1.85;
  color: rgba(243, 237, 224, 0.84);
  margin-bottom: 0;
}

.page-about .about-hero__stats {
  margin-top: clamp(26px, 4vw, 44px);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: rgba(200, 160, 74, 0.3);
  border: 1px solid rgba(200, 160, 74, 0.3);
}

.page-about .about-hero__stat {
  background: var(--inkblue);
  padding: 16px 14px;
}

.page-about .about-hero__stat b {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.35rem, 3.4vw, 1.85rem);
  line-height: 1.15;
  color: var(--gold-lit);
}

.page-about .about-hero__stat span {
  display: block;
  margin-top: 5px;
  font-size: var(--fs-12);
  letter-spacing: 0.08em;
  color: rgba(243, 237, 224, 0.62);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-sec {
  padding: clamp(52px, 8vw, 108px) 0;
}

.page-about .about-sec--paper {
  background: var(--paper);
  color: var(--ink);
}

.page-about .about-sec--deep {
  background: var(--inkblue-2);
  color: var(--paper);
}

.page-about .about-sec--paper a {
  color: var(--cinnabar);
  border-bottom-color: rgba(182, 60, 43, 0.45);
}

.page-about .about-sec--paper a:hover,
.page-about .about-sec--paper a:focus-visible {
  color: var(--cinnabar-lit);
  border-bottom-color: var(--cinnabar-lit);
}

.page-about .about-sec__grid {
  display: grid;
  gap: clamp(18px, 3vw, 30px);
}

.page-about .about-sec__rail {
  display: flex;
  align-items: baseline;
  gap: 14px;
  border-top: 1px solid rgba(200, 160, 74, 0.45);
  padding-top: 12px;
}

.page-about .about-sec__num {
  font-family: var(--font-mono);
  font-size: var(--fs-28);
  line-height: 1;
  letter-spacing: 0.04em;
  color: var(--gold);
}

.page-about .about-sec__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.45rem, 3.4vw, 2.35rem);
  line-height: 1.26;
  letter-spacing: 0.01em;
  margin: 0 0 clamp(16px, 2.6vw, 26px);
}

.page-about .about-sec--paper .about-sec__title {
  color: var(--ink);
}

.page-about .about-sec--deep .about-sec__title {
  color: var(--paper);
}

.page-about .about-sec__body {
  min-width: 0;
}

.page-about .about-sec--paper .about-sec__body {
  color: #2c3239;
}

.page-about .about-sec--deep .about-sec__body {
  color: rgba(243, 237, 224, 0.82);
}

.page-about .about-sec__body p {
  max-width: 62ch;
  line-height: 1.85;
}

/* ---------- 要点列表 ---------- */
.page-about .point-list {
  list-style: none;
  margin: 0 0 18px;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .point-list li {
  padding: 14px 16px 14px 18px;
  border-left: 2px solid var(--gold);
  background: rgba(11, 31, 46, 0.055);
  line-height: 1.8;
  font-size: var(--fs-16);
}

.page-about .about-sec--deep .point-list li {
  background: rgba(243, 237, 224, 0.06);
}

.page-about .point-list strong {
  color: inherit;
  font-weight: 700;
}

/* ---------- 图文分栏 ---------- */
.page-about .about-split {
  display: grid;
  gap: clamp(22px, 3.2vw, 38px);
  margin-bottom: clamp(20px, 3vw, 32px);
}

.page-about .about-figure {
  margin: 0;
  min-width: 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  background: var(--inkblue);
  border: 1px solid rgba(200, 160, 74, 0.4);
  outline: 1px solid rgba(200, 160, 74, 0.18);
  outline-offset: 4px;
}

.page-about .about-figure__cap {
  margin-top: 14px;
  font-size: var(--fs-12);
  letter-spacing: 0.1em;
  color: var(--stone);
}

.page-about .about-sec--deep .about-figure__cap {
  color: rgba(110, 143, 163, 0.95);
}

/* ---------- 区域矩阵 ---------- */
.page-about .region-grid {
  list-style: none;
  margin: 6px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.page-about .region-card {
  display: grid;
  gap: 3px;
  padding: 14px 12px;
  border: 1px solid rgba(200, 160, 74, 0.34);
  background: rgba(11, 31, 46, 0.32);
  transition: border-color 160ms ease, transform 160ms ease, background 160ms ease;
}

.page-about .region-card:hover {
  border-color: var(--gold-lit);
  background: rgba(200, 160, 74, 0.12);
  transform: translateY(-2px);
}

.page-about .region-card__name {
  font-family: var(--font-display);
  font-size: var(--fs-20);
  line-height: 1.2;
  color: var(--paper);
}

.page-about .region-card__count {
  font-family: var(--font-mono);
  font-size: var(--fs-14);
  color: var(--gold-lit);
}

/* ---------- 更新流程 ---------- */
.page-about .flow {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid rgba(29, 35, 41, 0.2);
}

.page-about .flow li {
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr);
  gap: 12px;
  padding: 15px 0;
  border-bottom: 1px solid rgba(29, 35, 41, 0.13);
  font-size: var(--fs-16);
  line-height: 1.8;
}

.page-about .flow__idx {
  font-family: var(--font-mono);
  font-size: var(--fs-14);
  color: var(--cinnabar);
  padding-top: 4px;
}

.page-about .flow__title {
  display: block;
  font-weight: 700;
  margin-bottom: 3px;
  color: var(--ink);
}

/* ---------- 团队 ---------- */
.page-about .team-bar {
  display: flex;
  height: 26px;
  margin: 22px 0 16px;
  border: 1px solid rgba(200, 160, 74, 0.4);
  background: rgba(11, 31, 46, 0.5);
  overflow: hidden;
}

.page-about .team-bar__seg {
  display: block;
  height: 100%;
}

.page-about .team-bar__seg + .team-bar__seg {
  border-left: 2px solid var(--inkblue-2);
}

.page-about .team-bar__seg--product {
  flex: 12 1 0;
  background: var(--gold);
}

.page-about .team-bar__seg--index {
  flex: 12 1 0;
  background: var(--cinnabar);
}

.page-about .team-bar__seg--tech {
  flex: 9 1 0;
  background: var(--stone);
}

.page-about .team-bar__seg--service {
  flex: 15 1 0;
  background: var(--celadon);
}

.page-about .team-legend {
  list-style: none;
  margin: 0 0 4px;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px 16px;
}

.page-about .team-legend li {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: var(--fs-14);
  color: rgba(243, 237, 224, 0.86);
}

.page-about .team-legend__dot {
  width: 10px;
  height: 10px;
  flex: none;
}

.page-about .team-legend__dot--product {
  background: var(--gold);
}

.page-about .team-legend__dot--index {
  background: var(--cinnabar);
}

.page-about .team-legend__dot--tech {
  background: var(--stone);
}

.page-about .team-legend__dot--service {
  background: var(--celadon);
}

.page-about .team-legend__num {
  margin-left: auto;
  font-family: var(--font-mono);
  color: var(--gold-lit);
}

.page-about .duty-list {
  margin: 24px 0 20px;
  display: grid;
  gap: 8px;
}

.page-about .duty {
  border: 1px solid rgba(200, 160, 74, 0.26);
  background: rgba(243, 237, 224, 0.045);
  transition: border-color 160ms ease;
}

.page-about .duty:hover {
  border-color: rgba(200, 160, 74, 0.6);
}

.page-about .duty summary {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  cursor: pointer;
  list-style: none;
  font-weight: 700;
  font-size: var(--fs-16);
  color: var(--paper);
}

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

.page-about .duty summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: var(--fs-16);
  color: var(--gold);
  line-height: 1;
}

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

.page-about .duty p {
  margin: 0;
  padding: 0 14px 14px;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: rgba(243, 237, 224, 0.76);
}

.page-about .team-note {
  border-left: 2px solid var(--celadon);
  padding-left: 16px;
  color: rgba(243, 237, 224, 0.82);
}

/* ---------- 统计 ---------- */
.page-about .stat-grid {
  margin: 22px 0 26px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: rgba(29, 35, 41, 0.2);
  border: 1px solid rgba(29, 35, 41, 0.2);
}

.page-about .stat-grid > div {
  background: var(--paper);
  padding: 18px 15px;
}

.page-about .stat-grid b {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.35rem, 3.6vw, 2rem);
  line-height: 1.15;
  color: var(--inkblue);
}

.page-about .stat-grid span {
  display: block;
  margin-top: 7px;
  font-size: var(--fs-14);
  line-height: 1.6;
  color: #5a6169;
}

/* ---------- 选择理由 ---------- */
.page-about .reason-grid {
  display: grid;
  gap: 12px;
  margin-bottom: clamp(26px, 4vw, 40px);
}

.page-about .reason {
  border: 1px solid rgba(200, 160, 74, 0.32);
  background: rgba(11, 31, 46, 0.45);
  padding: 18px 18px 20px;
  transition: border-color 160ms ease, transform 160ms ease;
}

.page-about .reason:hover {
  border-color: var(--gold-lit);
  transform: translateY(-2px);
}

.page-about .reason h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: var(--fs-20);
  line-height: 1.3;
  color: var(--gold-lit);
}

.page-about .reason p {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: rgba(243, 237, 224, 0.78);
}

.page-about .about-figure--city {
  margin-bottom: clamp(24px, 4vw, 38px);
}

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

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

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

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

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

  .page-about .about-split--media {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    align-items: start;
  }

  .page-about .reason-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
  }
}

@media (min-width: 880px) {
  .page-about .about-hero__grid {
    grid-template-columns: 176px minmax(0, 1fr);
    column-gap: clamp(32px, 5vw, 76px);
  }

  .page-about .about-hero__rail {
    border-top: 0;
    padding-top: 4px;
    align-self: start;
    position: sticky;
    top: calc(var(--rail-h) + var(--header-h) + 22px);
  }

  .page-about .about-label {
    writing-mode: vertical-rl;
    text-orientation: upright;
    letter-spacing: 0.32em;
    font-size: var(--fs-12);
  }

  .page-about .about-toc {
    grid-template-columns: 1fr;
  }

  .page-about .about-sec__grid {
    grid-template-columns: 152px minmax(0, 1fr);
    column-gap: clamp(28px, 4.6vw, 76px);
  }

  .page-about .about-sec__rail {
    flex-direction: column;
    align-items: flex-start;
    align-self: start;
    gap: 18px;
    position: sticky;
    top: calc(var(--rail-h) + var(--header-h) + 26px);
  }
}

@media (max-width: 479px) {
  .page-about .about-hero__title {
    font-size: clamp(1.6rem, 7.4vw, 2.1rem);
  }

  .page-about .team-legend {
    grid-template-columns: 1fr;
  }

  .page-about .stat-grid {
    grid-template-columns: 1fr;
  }

  .page-about .flow li {
    grid-template-columns: 30px minmax(0, 1fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .region-card,
  .page-about .reason,
  .page-about .duty,
  .page-about .about-toc a {
    transition: none;
  }

  .page-about .region-card:hover,
  .page-about .reason:hover {
    transform: none;
  }
}
<<<END>>>