.page-about {
  padding-top: calc(var(--header-h) + 16px);
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  overflow-x: hidden;
}
.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--font-round);
  font-weight: 800;
  line-height: 1.22;
  margin: 0;
  color: var(--ink);
}
.page-about p {
  margin: 0 0 16px;
}
.page-about a {
  color: var(--orange-deep);
  text-decoration: none;
  border-bottom: 1px solid rgba(212, 80, 31, 0.4);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.page-about a:hover {
  color: var(--violet);
  border-bottom-color: var(--violet);
}
.page-about img {
  display: block;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .eyebrow {
  margin-bottom: 12px;
}
.page-about .section-title {
  margin-bottom: 16px;
  font-size: clamp(24px, 6vw, 36px);
}

/* 面包屑 */
.page-about .about-crumb {
  padding-bottom: 10px;
}
.page-about .breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--rock);
}
.page-about .breadcrumb-item + .breadcrumb-item::before {
  content: "/";
  margin-right: 6px;
  color: var(--line-2);
}
.page-about .breadcrumb-link {
  color: var(--rock);
  border-bottom: none;
}
.page-about .breadcrumb-link:hover {
  color: var(--orange-deep);
  border-bottom: none;
}
.page-about .breadcrumb-current {
  color: var(--ink);
}

/* 首屏框景 */
.page-about .about-hero {
  padding: 4px 0 44px;
}
.page-about .about-hero-grid {
  display: grid;
  gap: 26px;
  padding-top: 20px;
  border-top: 1px solid var(--line-2);
}
.page-about .about-hero-main {
  position: relative;
  padding-left: 16px;
}
.page-about .about-hero-main::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  bottom: 4px;
  width: 2px;
  background: linear-gradient(180deg, var(--orange), var(--yellow));
}
.page-about .about-hero h1 {
  font-size: clamp(28px, 8vw, 54px);
  letter-spacing: -0.01em;
  margin-bottom: 18px;
  max-width: 20ch;
}
.page-about .about-lead {
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink);
  max-width: 56ch;
  margin-bottom: 24px;
}
.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.page-about .about-hero-actions .btn {
  border-bottom: none;
}
.page-about .about-hero-side {
  position: relative;
  border: 1px solid var(--line-2);
  background: var(--paper-2);
  padding: 14px 14px 10px;
}
.page-about .about-hero-side::after {
  content: "CN / 001";
  position: absolute;
  right: 10px;
  top: -9px;
  padding: 0 6px;
  background: var(--paper);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  color: var(--rock);
}
.page-about .about-hero-art {
  width: 100%;
  height: auto;
  display: block;
}
.page-about .about-hero-cap {
  margin: 10px 0 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--rock);
}

/* 章节索引 */
.page-about .about-index {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 14px 0;
}
.page-about .about-index-title {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--moss);
  margin-bottom: 10px;
}
.page-about .about-index-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about .about-index-link {
  font-size: 13px;
  color: var(--ink);
  border-bottom: 1px dashed var(--line-2);
}
.page-about .about-index-link:hover {
  color: var(--orange-deep);
  border-bottom-color: var(--orange);
}

/* 章节通用 */
.page-about .about-section {
  padding: 44px 0;
  border-bottom: 1px solid var(--line);
}
.page-about .about-head {
  max-width: 68ch;
  margin-bottom: 26px;
}
.page-about .about-head-text {
  color: var(--rock);
  font-size: 15px;
}
.page-about .about-grid {
  display: grid;
  gap: 28px;
}
.page-about .about-prose > p {
  font-size: 16px;
}
.page-about .about-aside {
  border-left: 1px solid var(--line-2);
  padding-left: 16px;
}
.page-about .about-aside-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--clay);
  margin-bottom: 10px;
}
.page-about .about-aside-text {
  font-size: 13px;
  line-height: 1.7;
  color: var(--rock);
}
.page-about .about-quote {
  margin: 24px 0;
  padding: 4px 0 4px 18px;
  border-left: 2px solid var(--clay);
}
.page-about .about-quote p {
  font-size: 18px;
  font-weight: 700;
  line-height: 1.6;
  color: var(--night);
  margin-bottom: 8px;
}
.page-about .about-quote cite {
  font-style: normal;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--rock);
}

/* 插图 */
.page-about .about-figure {
  margin: 0 0 30px;
}
.page-about .about-figure img {
  width: 100%;
  border: 1px solid var(--line);
  border-bottom: 3px solid var(--yellow);
}
.page-about .about-figure-cap {
  margin: 10px 0 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--rock);
}

/* 时间线 */
.page-about .about-tl {
  list-style: none;
  margin: 0;
  padding: 0 0 0 18px;
  border-left: 1px solid var(--line-2);
}
.page-about .about-tl-item {
  position: relative;
  padding: 0 0 28px 12px;
}
.page-about .about-tl-item:last-child {
  padding-bottom: 0;
}
.page-about .about-tl-item::before {
  content: "";
  position: absolute;
  left: -22px;
  top: 7px;
  width: 9px;
  height: 9px;
  background: var(--paper);
  border: 1px solid var(--clay);
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.page-about .about-tl-item:hover::before {
  background: var(--orange);
  border-color: var(--orange-deep);
}
.page-about .about-tl-num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--moss);
  margin-bottom: 4px;
}
.page-about .about-tl-title {
  font-size: 18px;
  margin-bottom: 8px;
  transition: color var(--dur) var(--ease);
}
.page-about .about-tl-item:hover .about-tl-title {
  color: var(--orange-deep);
}
.page-about .about-tl-text {
  font-size: 15px;
  color: var(--rock);
  margin-bottom: 0;
  max-width: 62ch;
}

/* 服务版图 */
.page-about .about-map-body {
  display: grid;
  gap: 22px;
  margin-bottom: 22px;
}
.page-about .about-map-figure {
  margin: 0;
}
.page-about .about-map-figure img {
  width: 100%;
  border: 1px solid var(--line);
  background: var(--paper-2);
}
.page-about .about-legend {
  list-style: none;
  margin: 0;
  padding: 0;
  border: 1px solid var(--line);
  background: var(--paper-2);
}
.page-about .about-legend-item {
  display: grid;
  grid-template-columns: 14px 1fr;
  grid-template-areas:
    "swatch key"
    "swatch val";
  gap: 2px 12px;
  padding: 12px 14px;
  border-bottom: 1px solid var(--line);
  transition: background var(--dur) var(--ease);
}
.page-about .about-legend-item:last-child {
  border-bottom: none;
}
.page-about .about-legend-item:hover {
  background: var(--yellow);
}
.page-about .about-legend-swatch {
  grid-area: swatch;
  width: 12px;
  height: 12px;
  margin-top: 5px;
  border: 1px solid var(--ink);
}
.page-about .about-legend-swatch--moss { background: var(--moss); }
.page-about .about-legend-swatch--clay { background: var(--clay); }
.page-about .about-legend-swatch--orange { background: var(--orange); }
.page-about .about-legend-swatch--violet { background: var(--violet); }
.page-about .about-legend-swatch--yellow { background: var(--yellow); }
.page-about .about-legend-key {
  grid-area: key;
  font-size: 13px;
  font-weight: 700;
  color: var(--ink);
}
.page-about .about-legend-val {
  grid-area: val;
  font-size: 13px;
  color: var(--rock);
  line-height: 1.5;
}
.page-about .about-map-note {
  font-size: 14px;
  color: var(--rock);
  padding: 14px 16px;
  background: var(--paper-2);
  border-left: 2px solid var(--moss);
  margin: 0;
}

/* 团队 */
.page-about .about-team {
  display: grid;
  gap: 28px;
}
.page-about .about-team-text > p {
  font-size: 15px;
  max-width: 62ch;
}
.page-about .about-team-figure {
  margin: 0;
}
.page-about .about-team-figure img {
  width: 100%;
  border: 1px solid var(--line);
  border-top: 3px solid var(--mint);
}
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 24px 0 0;
  background: var(--line);
  border: 1px solid var(--line);
}
.page-about .about-stat {
  background: var(--paper);
  padding: 14px;
}
.page-about .about-stat-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--rock);
  margin-bottom: 4px;
}
.page-about .about-stat-num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
  color: var(--orange-deep);
  line-height: 1.2;
}

/* 分类体系 */
.page-about .about-tax-block {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  margin-bottom: 24px;
}
.page-about .about-tax-dim {
  background: var(--paper);
  padding: 18px 16px;
  border-left: 3px solid transparent;
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}
.page-about .about-tax-dim:hover {
  border-left-color: var(--orange);
  background: var(--paper-2);
}
.page-about .about-tax-name {
  font-size: 18px;
  margin-bottom: 8px;
}
.page-about .about-tax-desc {
  font-size: 14px;
  color: var(--rock);
  margin: 0;
}
.page-about .about-tax-block--alt {
  display: block;
  background: transparent;
  border: 1px solid var(--line-2);
  padding: 20px 16px;
}
.page-about .about-tax-sub {
  font-size: 17px;
  margin-bottom: 14px;
}
.page-about .about-tax-list {
  list-style: none;
  margin: 0 0 14px;
  padding: 0;
}
.page-about .about-tax-list li {
  display: grid;
  gap: 2px;
  padding: 10px 0;
  border-bottom: 1px dashed var(--line);
}
.page-about .about-tax-list li:last-child {
  border-bottom: none;
}
.page-about .about-tax-key {
  font-weight: 700;
  font-size: 14px;
  color: var(--night);
}
.page-about .about-tax-key::before {
  content: "";
  display: inline-block;
  width: 14px;
  height: 1px;
  margin-right: 8px;
  vertical-align: middle;
  background: var(--clay);
}
.page-about .about-tax-val {
  font-size: 13px;
  color: var(--rock);
  line-height: 1.6;
}
.page-about .about-tax-foot {
  font-size: 13px;
  color: var(--rock);
  margin: 0;
}

/* 收束 */
.page-about .about-close {
  background: var(--night);
  color: var(--paper);
  padding: 48px 0 52px;
  margin-top: 0;
}
.page-about .about-close-inner {
  display: grid;
  gap: 26px;
}
.page-about .about-close-eyebrow {
  color: var(--yellow);
}
.page-about .about-close-title {
  color: var(--paper);
  font-size: clamp(24px, 6.4vw, 40px);
  margin-bottom: 14px;
}
.page-about .about-close-lead {
  color: rgba(247, 241, 230, 0.78);
  font-size: 15px;
  max-width: 60ch;
  margin: 0;
}
.page-about .about-reasons {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-inv);
  border: 1px solid var(--line-inv);
}
.page-about .about-reason {
  background: var(--night);
  padding: 16px;
  transition: background var(--dur) var(--ease);
}
.page-about .about-reason:hover {
  background: var(--night-2);
}
.page-about .about-reason-num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--mint);
  margin-bottom: 6px;
}
.page-about .about-reason-title {
  color: var(--paper);
  font-size: 16px;
  margin-bottom: 6px;
}
.page-about .about-reason-text {
  font-size: 13px;
  line-height: 1.7;
  color: rgba(247, 241, 230, 0.72);
  margin: 0;
}
.page-about .about-close-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.page-about .about-close-actions .btn {
  border-bottom: none;
}
.page-about .about-close-note {
  font-size: 12px;
  color: rgba(247, 241, 230, 0.62);
  margin: 0;
}

/* 平板及以上 */
@media (min-width: 720px) {
  .page-about .about-tl {
    padding-left: 26px;
  }
  .page-about .about-tl-item {
    padding-left: 20px;
  }
  .page-about .about-tl-item::before {
    left: -31px;
  }
  .page-about .about-legend-item {
    grid-template-columns: 14px 190px 1fr;
    grid-template-areas: "swatch key val";
    align-items: baseline;
  }
  .page-about .about-legend-swatch {
    margin-top: 0;
    align-self: center;
  }
  .page-about .about-tax-block {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .about-tax-list li {
    grid-template-columns: 150px 1fr;
    gap: 16px;
    align-items: baseline;
  }
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .about-reasons {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* 桌面 */
@media (min-width: 960px) {
  .page-about .about-hero {
    padding-bottom: 56px;
  }
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1fr) 330px;
    gap: 56px;
    align-items: start;
    padding-top: 26px;
  }
  .page-about .about-hero-main {
    padding-left: 24px;
  }
  .page-about .about-grid {
    grid-template-columns: minmax(0, 1fr) 280px;
    gap: 48px;
    align-items: start;
  }
  .page-about .about-aside {
    position: sticky;
    top: calc(var(--header-h) + 24px);
  }
  .page-about .about-map-body {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    gap: 32px;
    align-items: start;
  }
  .page-about .about-team {
    grid-template-columns: minmax(0, 1fr) 360px;
    gap: 48px;
    align-items: start;
  }
  .page-about .about-section {
    padding: 64px 0;
  }
  .page-about .about-close-inner {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr);
    gap: 40px 48px;
    align-items: start;
  }
  .page-about .about-close-actions,
  .page-about .about-close-note {
    grid-column: 1 / -1;
  }
  .page-about .about-close-note {
    border-top: 1px solid var(--line-inv);
    padding-top: 16px;
  }
  .page-about .about-close {
    padding: 72px 0 76px;
  }
  .page-about .about-index-list {
    gap: 8px 28px;
  }
}
<<<END>>>