.page-about {
  --about-rail: 200px;
  background:
    radial-gradient(circle at 88% 2%, rgba(217, 238, 243, 0.85), transparent 46%),
    var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  overflow-x: clip;
}

.page-about .about-top {
  padding-block: clamp(1rem, 3vw, 1.75rem) clamp(1.75rem, 4vw, 2.75rem);
}

.page-about .breadcrumb {
  margin-bottom: clamp(1rem, 3vw, 1.75rem);
  font-size: 0.875rem;
}

/* 首屏 */
.page-about .about-hero {
  display: grid;
  gap: clamp(1.25rem, 4vw, 2.5rem);
  align-items: center;
}

.page-about .kicker {
  margin: 0 0 0.5rem;
  letter-spacing: 0.14em;
  font-size: 0.8125rem;
  color: var(--lake);
  text-transform: uppercase;
}

.page-about .about-hero h1 {
  margin: 0 0 0.9rem;
  font-size: clamp(2.1rem, 6.4vw, 3.9rem);
  line-height: 1.1;
  letter-spacing: 0.03em;
  color: var(--lake-deep);
  font-weight: 800;
}

.page-about .lede {
  margin: 0;
  max-width: 40em;
  font-size: clamp(1rem, 1.6vw, 1.125rem);
  line-height: 1.75;
  color: var(--ink-soft);
}

.page-about .hero-tags {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 1.25rem 0 0;
  padding: 0;
}

.page-about .hero-tags .tag {
  border: 1px solid var(--line-lake);
  background: rgba(217, 238, 243, 0.6);
  color: var(--lake-deep);
  border-radius: 999px;
  padding: 0.35rem 0.85rem;
  font-size: 0.8125rem;
  letter-spacing: 0.01em;
}

.page-about .hero-media {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--line);
  box-shadow: var(--shadow-soft);
  background: var(--lake-pale);
  margin: 0;
}

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

/* 品牌证据板 */
.page-about .evidence {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.65rem;
  margin-top: clamp(1.5rem, 4vw, 2.5rem);
}

.page-about .ev-tile {
  background: var(--paper-raise);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 0.9rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  box-shadow: var(--shadow-soft);
}

.page-about .ev-main {
  grid-column: 1 / -1;
  background: var(--lake-pale);
  border-color: var(--line-lake);
  border-left: 3px solid var(--orange);
  padding: 1.1rem 1.15rem;
}

.page-about .ev-label {
  margin: 0 0 0.35rem;
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  color: var(--lake);
  text-transform: uppercase;
}

.page-about .ev-lead {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--ink);
}

.page-about .ev-num {
  font-size: 1.5rem;
  line-height: 1.1;
  letter-spacing: 0.05em;
  color: var(--lake-deep);
  font-weight: 700;
}

.page-about .ev-cap {
  font-size: 0.8125rem;
  line-height: 1.6;
  color: var(--ink-soft);
}

/* 主体：索引轨 + 章节流 */
.page-about .about-body {
  display: grid;
  gap: 1.5rem;
  padding-bottom: clamp(2rem, 6vw, 4rem);
}

.page-about .chapter-rail {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding-block: 0.75rem;
}

.page-about .rail-title {
  margin: 0 0 0.5rem;
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  color: var(--lake);
  text-transform: uppercase;
}

.page-about .index-list {
  list-style: none;
  display: flex;
  gap: 0.4rem;
  margin: 0;
  padding: 0 0 0.25rem;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

.page-about .index-list > li {
  flex: 0 0 auto;
}

.page-about .index-link {
  display: inline-flex;
  align-items: baseline;
  gap: 0.4rem;
  padding: 0.5rem 0.7rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--ink-soft);
  text-decoration: none;
  font-size: 0.8125rem;
  white-space: nowrap;
  background: var(--paper-raise);
  transition: color var(--ease), border-color var(--ease), background var(--ease);
}

.page-about .index-link .mono {
  font-size: 0.75rem;
  color: var(--lake);
  letter-spacing: 0.08em;
}

.page-about .index-link:hover,
.page-about .index-link:focus-visible {
  border-color: var(--lake);
  color: var(--lake-deep);
  background: var(--lake-pale);
}

.page-about .index-link[aria-current="true"] {
  border-color: var(--orange);
  background: var(--lake-pale);
  color: var(--lake-deep);
  box-shadow: inset 0 -2px 0 var(--orange);
}

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

.page-about .chapter {
  position: relative;
  padding-block: clamp(1.75rem, 5vw, 3rem);
  border-top: 1px solid var(--line);
}

.page-about .chapter:first-child {
  border-top: 0;
  padding-top: 0.5rem;
}

.page-about .chapter-head {
  display: flex;
  align-items: baseline;
  gap: 0.9rem;
  margin-bottom: 1.1rem;
}

.page-about .chapter-num {
  font-size: clamp(1.9rem, 6vw, 3rem);
  line-height: 1;
  color: var(--lake);
  letter-spacing: 0.06em;
  font-weight: 800;
  opacity: 0.9;
}

.page-about .chapter-title {
  margin: 0;
  font-size: clamp(1.3rem, 3.2vw, 1.85rem);
  line-height: 1.3;
  letter-spacing: 0.03em;
  color: var(--lake-deep);
  font-weight: 800;
}

.page-about .chapter p {
  margin: 0 0 1rem;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--ink);
  max-width: 68ch;
}

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

/* 陶土引用块 */
.page-about .clay-quote {
  margin: 1.5rem 0 0;
  padding: 1.15rem 1.25rem;
  border-left: 3px solid var(--clay);
  background: linear-gradient(180deg, rgba(182, 106, 74, 0.09), rgba(246, 241, 231, 0.4));
  border-radius: 0 var(--radius) var(--radius) 0;
}

.page-about .clay-quote p {
  margin: 0;
  font-size: clamp(1.05rem, 2.4vw, 1.3rem);
  line-height: 1.6;
  letter-spacing: 0.02em;
  color: var(--lake-deep);
  font-weight: 700;
}

/* 服务原则 */
.page-about .principle-grid {
  display: grid;
  gap: 0.75rem;
  margin: 1.25rem 0;
}

.page-about .principle {
  position: relative;
  background: var(--paper-raise);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1rem 1.05rem 1.1rem;
  box-shadow: var(--shadow-soft);
  transition: transform var(--ease), box-shadow var(--ease), border-color var(--ease);
}

.page-about .principle:hover {
  transform: translateY(-2px);
  border-color: var(--line-lake);
  box-shadow: var(--shadow-raise);
}

.page-about .principle-idx {
  display: inline-block;
  margin: 0 0 0.4rem;
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  color: var(--orange);
}

.page-about .principle h3 {
  margin: 0 0 0.4rem;
  font-size: 1.05rem;
  letter-spacing: 0.02em;
  color: var(--lake-deep);
}

.page-about .principle p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--ink-soft);
}

.page-about .principle-tail {
  border-top: 1px dashed var(--line-strong);
  padding-top: 1rem;
  color: var(--ink-soft);
}

/* 发展历程 */
.page-about .chapter-journey {
  isolation: isolate;
}

.page-about .contour-art {
  position: absolute;
  inset: 0 0 auto auto;
  width: min(62%, 460px);
  height: 320px;
  pointer-events: none;
  z-index: -1;
  overflow: hidden;
  border-radius: var(--radius-lg);
}

.page-about .contour-art svg {
  width: 100%;
  height: 100%;
  display: block;
}

.page-about .contour-art path {
  fill: none;
  stroke: rgba(15, 110, 140, 0.16);
  stroke-width: 1;
}

.page-about .journey-media {
  margin: 0 0 1.5rem;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--lake-pale);
}

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

.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .tl-item {
  position: relative;
  padding-left: 1.85rem;
  padding-bottom: 1.5rem;
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.45rem;
  width: 0.6rem;
  height: 0.6rem;
  border-radius: 50%;
  background: var(--orange);
  box-shadow: 0 0 0 3px rgba(232, 121, 46, 0.18);
}

.page-about .tl-item::after {
  content: "";
  position: absolute;
  left: 0.28rem;
  top: 1.25rem;
  bottom: 0;
  width: 1px;
  background: var(--line-lake);
}

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

.page-about .tl-item:last-child::after {
  display: none;
}

.page-about .tl-year {
  margin: 0 0 0.25rem;
  font-size: 0.8125rem;
  letter-spacing: 0.14em;
  color: var(--lake);
  font-weight: 700;
}

.page-about .tl-title {
  margin: 0 0 0.4rem;
  font-size: 1.0625rem;
  letter-spacing: 0.02em;
  color: var(--lake-deep);
}

.page-about .tl-text {
  margin: 0 0 0.55rem;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--ink-soft);
}

.page-about .tl-details {
  border-left: 2px solid var(--lake-pale);
  padding-left: 0.75rem;
}

.page-about .tl-details > summary {
  cursor: pointer;
  list-style: none;
  font-size: 0.8125rem;
  color: var(--lake);
  letter-spacing: 0.02em;
  padding: 0.15rem 0;
  transition: color var(--ease);
}

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

.page-about .tl-details > summary::before {
  content: "＋ ";
  color: var(--orange);
}

.page-about .tl-details[open] > summary::before {
  content: "－ ";
}

.page-about .tl-details > summary:hover,
.page-about .tl-details > summary:focus-visible {
  color: var(--lake-deep);
}

.page-about .tl-details p {
  margin: 0.5rem 0 0;
  font-size: 0.875rem;
  line-height: 1.75;
  color: var(--ink-soft);
  background: var(--lake-pale);
  border-radius: var(--radius-sm);
  padding: 0.75rem 0.85rem;
}

/* 团队 */
.page-about .team-media {
  margin: 1.25rem 0;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--paper-raise);
}

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

.page-about .media-caption {
  padding: 0.55rem 0.8rem;
  font-size: 0.8125rem;
  line-height: 1.6;
  color: var(--ink-soft);
  background: var(--paper-raise);
  border-top: 1px solid var(--line);
}

.page-about .team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.7rem;
  margin-top: 1.25rem;
}

.page-about .team {
  background: var(--paper-raise);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 0.95rem 1rem;
  border-top: 2px solid var(--barley);
}

.page-about .team:nth-child(2) {
  border-top-color: var(--lake);
}

.page-about .team:nth-child(3) {
  border-top-color: var(--orange);
}

.page-about .team:nth-child(4) {
  border-top-color: var(--clay);
}

.page-about .team h3 {
  margin: 0 0 0.4rem;
  font-size: 1rem;
  letter-spacing: 0.02em;
  color: var(--lake-deep);
}

.page-about .team p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--ink-soft);
}

/* 长期陪伴 */
.page-about .steady-list {
  list-style: none;
  margin: 1.25rem 0;
  padding: 0;
  display: grid;
  gap: 0.7rem;
  counter-reset: steady;
}

.page-about .steady-list > li {
  background: var(--paper-raise);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1rem 1.05rem;
  position: relative;
}

.page-about .steady-list > li::before {
  counter-increment: steady;
  content: counter(steady, decimal-leading-zero);
  position: absolute;
  top: 0.85rem;
  right: 1rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: rgba(15, 110, 140, 0.5);
}

.page-about .steady-list h3 {
  margin: 0 0 0.35rem;
  font-size: 1rem;
  letter-spacing: 0.02em;
  color: var(--lake-deep);
  padding-right: 2.2rem;
}

.page-about .steady-list p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--ink-soft);
}

.page-about .steady-tail {
  color: var(--ink-soft);
}

.page-about .next-links {
  display: grid;
  gap: 0.6rem;
  margin-top: 1.5rem;
}

.page-about .next-card {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  padding: 0.9rem 1rem;
  border: 1px solid var(--line-lake);
  border-radius: var(--radius);
  background: var(--lake-pale);
  text-decoration: none;
  transition: transform var(--ease), background var(--ease), border-color var(--ease);
}

.page-about .next-card .mono {
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  color: var(--lake);
}

.page-about .next-card strong {
  font-size: 0.9375rem;
  line-height: 1.5;
  color: var(--lake-deep);
  font-weight: 700;
}

.page-about .next-card:hover,
.page-about .next-card:focus-visible {
  transform: translateY(-2px);
  background: rgba(217, 238, 243, 0.95);
  border-color: var(--orange);
}

/* 显现动效 */
.page-about [data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 420ms ease, transform 420ms ease;
}

.page-about [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .page-about .principle,
  .page-about .next-card {
    transition: none;
  }
}

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

  .page-about .ev-main {
    grid-column: span 4;
  }

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

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

/* 桌面 */
@media (min-width: 860px) {
  .page-about .about-hero {
    grid-template-columns: 1.05fr 0.95fr;
  }

  .page-about .evidence {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }

  .page-about .ev-main {
    grid-column: span 2;
    grid-row: span 2;
    justify-content: center;
  }

  .page-about .ev-tile:not(.ev-main) {
    grid-column: span 2;
  }
}

@media (min-width: 960px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(2rem, 4vw, 3.5rem);
    align-items: start;
  }

  .page-about .chapter-rail {
    position: sticky;
    top: 96px;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: var(--paper-raise);
    padding: 0.9rem 0.85rem 1rem;
    box-shadow: var(--shadow-soft);
  }

  .page-about .index-list {
    flex-direction: column;
    gap: 0.15rem;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .index-list > li {
    flex: 1 1 auto;
  }

  .page-about .index-link {
    display: flex;
    width: 100%;
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    background: transparent;
    padding: 0.45rem 0.6rem;
    white-space: normal;
    line-height: 1.45;
  }

  .page-about .index-link[aria-current="true"] {
    border-left-color: var(--orange);
    box-shadow: none;
    background: var(--lake-pale);
  }

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

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

  .page-about .steady-list > li:last-child {
    grid-column: span 2;
  }
}

@media (min-width: 1120px) {
  .page-about .evidence {
    grid-template-columns: 1.6fr 1fr 1fr 1fr;
  }

  .page-about .ev-main {
    grid-column: span 1;
    grid-row: span 2;
  }

  .page-about .ev-tile:not(.ev-main) {
    grid-column: span 1;
  }

  .page-about .principle-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}
</｜｜DSML｜｜ parameter>
</invoke>
</final_answer>