.page-about {
  padding-top: 8px;
  padding-bottom: 24px;
}

/* 面包屑 */
.page-about .about-crumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 13px;
  color: var(--mist);
}
.page-about .about-crumb li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--line);
}
.page-about .about-crumb a {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .16s var(--ease), border-color .16s var(--ease);
}
.page-about .about-crumb a:hover,
.page-about .about-crumb a:focus-visible {
  color: var(--cyan-lift);
  border-bottom-color: var(--cyan);
}
.page-about .about-crumb [aria-current="page"] {
  color: var(--text);
}

/* 开篇 */
.page-about .about-overture {
  display: grid;
  gap: 32px;
  padding-block: 28px 48px;
}
.page-about .about-h1 {
  margin: 12px 0 20px;
  color: var(--text);
  line-height: 1.12;
  max-width: 16em;
}
.page-about .overture-lead {
  margin: 0 0 14px;
  max-width: 34em;
  font-size: 16px;
  line-height: 1.75;
  color: #c7d8e0;
}
.page-about .overture-lead--dim {
  color: var(--mist);
}
.page-about .overture-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 32px;
  margin: 26px 0 0;
  padding: 20px 0 0;
  list-style: none;
  border-top: 1px solid var(--line);
}
.page-about .overture-meta li {
  display: flex;
  align-items: baseline;
  gap: 8px;
  font-size: 13px;
  color: var(--mist);
}
.page-about .overture-meta .mono {
  font-size: 22px;
  color: var(--amber);
  letter-spacing: -.01em;
}
.page-about .overture-figure {
  position: relative;
  margin: 0;
}
.page-about .overture-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--line);
  filter: saturate(.9) contrast(1.04);
}
.page-about .overture-figure .annotation--vertical {
  position: absolute;
  right: -8px;
  bottom: 20px;
  color: var(--cyan);
  letter-spacing: .16em;
}

/* 分隔条 */
.page-about .about-rule {
  margin-block: 8px 0;
  border: 0;
  border-top: 1px solid var(--line);
  transform-origin: left center;
  transform: scaleX(0);
  transition: transform .9s var(--ease);
}
.page-about .about-rule.is-visible {
  transform: scaleX(1);
}

/* 时间线 */
.page-about .about-timeline {
  padding-block: 48px 56px;
}
.page-about .tl-wrap {
  display: grid;
  gap: 24px;
}
.page-about .tl-main {
  min-width: 0;
}
.page-about .tl-main h2 {
  margin: 0 0 10px;
  color: var(--text);
}
.page-about .tl-lead {
  margin: 0 0 32px;
  color: var(--mist);
  font-size: 15px;
  line-height: 1.7;
}
.page-about .tl {
  position: relative;
  margin: 0;
  padding: 0 0 0 26px;
  list-style: none;
  border-left: 1px solid var(--line);
}
.page-about .tl-item {
  position: relative;
  padding-bottom: 34px;
  opacity: .999;
}
.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -31px;
  top: 9px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--amber);
  box-shadow: 0 0 0 4px var(--ink);
  transition: box-shadow .2s var(--ease), transform .2s var(--ease);
}
.page-about .tl-item:hover::before,
.page-about .tl-item:focus-within::before {
  transform: scale(1.25);
  box-shadow: 0 0 0 4px var(--ink), 0 0 0 6px rgba(242, 178, 51, .28);
}
.page-about .tl-item--last {
  padding-bottom: 0;
}
.page-about .tl-year {
  display: inline-block;
  margin-bottom: 6px;
  font-size: 15px;
  letter-spacing: .06em;
  color: var(--amber);
}
.page-about .tl-body h3 {
  margin: 0 0 8px;
  font-size: 20px;
  color: var(--text);
}
.page-about .tl-body p {
  margin: 0;
  max-width: 32em;
  font-size: 15px;
  line-height: 1.72;
  color: #b9cbd4;
}
.page-about .tl-aside {
  display: none;
}

/* 纸面带：团队与原则 */
.page-about .about-creed {
  padding-block: 52px;
  color: var(--paper-ink);
}
.page-about .creed-head h2 {
  margin: 0 0 14px;
  color: var(--paper-ink);
}
.page-about .creed-lead {
  margin: 0 0 36px;
  max-width: 40em;
  font-size: 16px;
  line-height: 1.78;
  color: #4a453d;
}
.page-about .creed-grid {
  display: grid;
  gap: 28px;
  margin-bottom: 44px;
}
.page-about .role-list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid rgba(28, 26, 23, .18);
}
.page-about .role-list li {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  padding: 16px 0;
  border-bottom: 1px solid rgba(28, 26, 23, .18);
}
.page-about .role-num {
  flex: 0 0 auto;
  min-width: 34px;
  font-size: 22px;
  line-height: 1.1;
  color: #B4432B;
}
.page-about .role-list strong {
  display: block;
  margin-bottom: 4px;
  font-size: 15px;
  color: var(--paper-ink);
}
.page-about .role-list p {
  margin: 0;
  font-size: 14px;
  line-height: 1.65;
  color: #5b554b;
}
.page-about .creed-figure {
  margin: 0;
}
.page-about .creed-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid rgba(28, 26, 23, .2);
  filter: saturate(.85) contrast(1.05);
}
.page-about .creed-figure figcaption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.6;
  color: #6b6458;
}

.page-about .principle-head h3 {
  margin: 0 0 6px;
  color: var(--paper-ink);
}
.page-about .principle-head p {
  margin: 0 0 20px;
  font-size: 14px;
  color: #6b6458;
}
.page-about .principles {
  display: grid;
  gap: 0;
  border-top: 1px solid rgba(28, 26, 23, .2);
}
.page-about .principle {
  border-bottom: 1px solid rgba(28, 26, 23, .2);
}
.page-about .principle summary {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 16px 0;
  cursor: pointer;
  list-style: none;
}
.page-about .principle summary::-webkit-details-marker {
  display: none;
}
.page-about .principle summary:focus-visible {
  outline: 2px solid #B4432B;
  outline-offset: 3px;
}
.page-about .principle-num {
  flex: 0 0 auto;
  font-size: 13px;
  letter-spacing: .08em;
  color: #B4432B;
}
.page-about .principle-name {
  flex: 1 1 auto;
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--paper-ink);
}
.page-about .principle summary::after {
  content: "+";
  flex: 0 0 auto;
  font-size: 18px;
  line-height: 1;
  color: #8a8175;
  transition: transform .18s var(--ease);
}
.page-about .principle[open] summary::after {
  content: "−";
}
.page-about .principle p {
  margin: 0 0 18px;
  padding-left: 0;
  font-size: 15px;
  line-height: 1.75;
  color: #4a453d;
}

/* 合作生态 */
.page-about .about-partners {
  padding-block: 56px;
}
.page-about .partners-head h2 {
  margin: 0 0 12px;
  color: var(--text);
}
.page-about .partners-head p {
  margin: 0 0 34px;
  max-width: 40em;
  font-size: 15px;
  line-height: 1.75;
  color: #b9cbd4;
}
.page-about .steps {
  display: grid;
  gap: 0;
  margin: 0 0 28px;
  padding: 0;
  list-style: none;
  border-left: 1px solid var(--line);
}
.page-about .step {
  position: relative;
  padding: 0 0 26px 24px;
}
.page-about .step-dot {
  position: absolute;
  left: -4px;
  top: 6px;
  box-shadow: 0 0 0 4px var(--ink);
}
.page-about .step--end .step-dot {
  box-shadow: 0 0 0 4px var(--ink);
}
.page-about .step-idx {
  display: block;
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--mist);
  margin-bottom: 4px;
}
.page-about .step h3 {
  margin: 0 0 6px;
  font-size: 18px;
  color: var(--text);
}
.page-about .step p {
  margin: 0;
  max-width: 30em;
  font-size: 14px;
  line-height: 1.7;
  color: #a9bcc6;
}
.page-about .partners-figure {
  margin: 0 0 26px;
}
.page-about .partners-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--line);
  filter: saturate(.9) contrast(1.05);
}
.page-about .partners-tail {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: #b9cbd4;
}
.page-about .partners-tail a {
  color: var(--cyan-lift);
  text-decoration: none;
  border-bottom: 1px solid var(--cyan);
  padding-bottom: 1px;
}
.page-about .partners-tail a:hover {
  color: #fff;
}

/* 服务地区 */
.page-about .about-region {
  padding-bottom: 52px;
}
.page-about .region-inner {
  display: grid;
  gap: 12px;
  padding: 24px 0 0;
  border-top: 1px solid var(--line);
}
.page-about .region-inner h2 {
  margin: 0;
  font-size: 22px;
  color: var(--text);
}
.page-about .region-inner p {
  margin: 0;
  max-width: 42em;
  font-size: 15px;
  line-height: 1.75;
  color: #b9cbd4;
}
.page-about .region-icp {
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--mist);
}

/* 数据块 */
.page-about .about-figs {
  padding-bottom: 56px;
}
.page-about .figs-title {
  margin: 0 0 24px;
  color: var(--text);
}
.page-about .figs {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
.page-about .fig {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 24px 20px;
  background: var(--panel);
  color: inherit;
  text-decoration: none;
  transition: background-color .18s var(--ease);
}
.page-about .fig-num {
  font-size: 40px;
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--cyan);
}
.page-about .fig-num em {
  font-style: normal;
  margin-left: 4px;
  font-size: 16px;
  letter-spacing: 0;
  color: var(--cyan-lift);
}
.page-about .fig-label {
  font-size: 15px;
  font-weight: 700;
  color: var(--text);
}
.page-about .fig-note {
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist);
}
.page-about .fig--link:hover,
.page-about .fig--link:focus-visible {
  background: #0f2939;
  outline: none;
}
.page-about .fig--link:hover .fig-label,
.page-about .fig--link:focus-visible .fig-label {
  color: var(--amber);
}

/* 结尾 */
.page-about .about-cta {
  padding-bottom: 24px;
}
.page-about .cta-inner {
  display: grid;
  gap: 20px;
  padding: 28px 24px;
  border: 1px solid var(--line);
  background: linear-gradient(120deg, #0B1F2E 0%, #061320 100%);
  box-shadow: var(--shadow-panel);
}
.page-about .cta-copy h2 {
  margin: 0 0 8px;
  color: var(--text);
}
.page-about .cta-copy p {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--mist);
}
.page-about .cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* 响应式 */
@media (min-width: 700px) {
  .page-about .about-overture {
    grid-template-columns: minmax(0, 1fr) 240px;
    align-items: end;
    gap: 40px;
    padding-block: 36px 64px;
  }
  .page-about .overture-meta {
    gap: 10px 40px;
  }
  .page-about .creed-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: start;
    gap: 40px;
  }
  .page-about .principles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 32px;
  }
  .page-about .steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    border-left: 0;
    column-gap: 28px;
    row-gap: 4px;
  }
  .page-about .step {
    padding-left: 22px;
    border-left: 1px solid var(--line);
  }
  .page-about .step-dot {
    left: -4px;
  }
  .page-about .figs {
    grid-template-columns: repeat(12, minmax(0, 1fr));
  }
  .page-about .fig--wide {
    grid-column: span 7;
  }
  .page-about .fig--narrow {
    grid-column: span 5;
  }
  .page-about .fig {
    padding: 32px 28px;
  }
  .page-about .fig-num {
    font-size: 52px;
  }
  .page-about .cta-inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    padding: 34px 36px;
  }
}

@media (min-width: 980px) {
  .page-about .about-overture {
    grid-template-columns: minmax(0, 1fr) 320px;
    gap: 64px;
  }
  .page-about .tl-wrap {
    grid-template-columns: minmax(0, 8fr) minmax(0, 3fr);
    gap: 40px;
  }
  .page-about .tl-aside {
    display: block;
    padding-top: 96px;
  }
  .page-about .tl-aside .annotation--vertical {
    position: sticky;
    top: 120px;
    display: inline-block;
    color: var(--line);
    letter-spacing: .22em;
    border-left: 1px solid var(--cyan);
    padding-left: 10px;
  }
  .page-about .about-creed {
    padding-block: 80px;
  }
  .page-about .creed-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    gap: 56px;
    margin-bottom: 56px;
  }
  .page-about .principles {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    column-gap: 0;
    border-bottom: 1px solid rgba(28, 26, 23, .2);
  }
  .page-about .principle {
    border-bottom: 0;
    padding-right: 22px;
  }
  .page-about .principle + .principle {
    padding-left: 22px;
    border-left: 1px solid rgba(28, 26, 23, .2);
  }
  .page-about .principle summary {
    flex-wrap: wrap;
    gap: 8px;
  }
  .page-about .principle summary::after {
    margin-left: auto;
  }
  .page-about .principle-name {
    flex-basis: 100%;
    font-size: 17px;
  }
  .page-about .about-partners {
    padding-block: 80px;
  }
  .page-about .partners-body {
    display: grid;
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 48px;
    align-items: start;
  }
  .page-about .steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    margin-bottom: 0;
  }
  .page-about .partners-figure {
    margin: 0;
  }
  .page-about .about-region {
    padding-bottom: 72px;
  }
  .page-about .region-inner {
    grid-template-columns: minmax(0, 3fr) minmax(0, 7fr) auto;
    align-items: baseline;
    gap: 24px;
  }
  .page-about .about-figs {
    padding-bottom: 80px;
  }
  .page-about .cta-inner {
    padding: 40px 48px;
  }
}
</main>