.page-about {
  --about-stack: 72px;
  --about-toc: 196px;
}

/* 面包屑 */
.page-about .breadcrumb {
  padding-top: 30px;
  padding-bottom: 26px;
}

/* 主题声明区 */
.page-about .about-lead {
  padding-bottom: 56px;
}

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

.page-about .about-lead-body h1 {
  margin: 12px 0 20px;
  font-size: clamp(29px, 5.6vw, 54px);
  line-height: 1.14;
  letter-spacing: -0.012em;
  font-weight: 800;
  color: var(--snow);
  max-width: 19ch;
}

.page-about .about-lead-body .lede {
  margin: 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--mist);
  max-width: 62ch;
}

.page-about .about-lead-stats {
  list-style: none;
  margin: 30px 0 0;
  padding: 24px 0 0;
  border-top: 1px solid var(--ink-line);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 20px;
}

.page-about .about-lead-stats li {
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.page-about .about-stat-value {
  font-size: clamp(23px, 3.2vw, 32px);
  line-height: 1;
  font-weight: 700;
  color: var(--lime);
  letter-spacing: 0.02em;
}

.page-about .about-stat-label {
  font-size: 13px;
  color: var(--mist);
  letter-spacing: 0.04em;
}

.page-about .about-lead-media {
  margin: 0;
}

.page-about .about-lead-media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--ink-line);
}

/* 正文流动区 */
.page-about .about-flow {
  padding-top: 4px;
}

.page-about .about-flow-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 34px;
}

/* 章节导航 */
.page-about .about-toc {
  border-top: 1px solid var(--ink-line);
  padding-top: 18px;
}

.page-about .about-toc-title {
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-about .about-toc-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .about-toc-list a {
  display: flex;
  gap: 10px;
  align-items: baseline;
  padding: 8px 10px;
  border-left: 2px solid transparent;
  font-size: 14px;
  color: var(--mist);
  text-decoration: none;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-toc-list a:hover,
.page-about .about-toc-list a:focus-visible {
  color: var(--snow);
  border-left-color: var(--cyan);
}

.page-about .about-toc-list a .mono {
  font-size: 12px;
  color: var(--lime);
  letter-spacing: 0.06em;
}

/* 章节骨架 */
.page-about .about-content {
  display: grid;
  gap: var(--about-stack);
}

.page-about .about-section {
  scroll-margin-top: 84px;
}

.page-about .about-section-head {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 20px;
}

.page-about .about-section-head h2 {
  margin: 0;
  font-size: clamp(23px, 3.2vw, 32px);
  line-height: 1.28;
  font-weight: 700;
  color: var(--snow);
  max-width: 26ch;
}

.page-about .about-section-body > p {
  margin: 0 0 16px;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--mist);
  max-width: 68ch;
}

.page-about .about-section-body > p:first-child {
  color: var(--snow);
  font-size: 16.5px;
}

.page-about .about-section-body > p:last-child {
  margin-bottom: 0;
}

/* 时间轴 */
.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: 26px 0 0;
  padding: 0 0 0 30px;
  display: grid;
  gap: 26px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: var(--ink-line);
}

.page-about .about-milestone {
  position: relative;
}

.page-about .about-milestone-dot {
  position: absolute;
  left: -30px;
  top: 5px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--lime);
  box-shadow: 0 0 0 3px rgba(200, 255, 61, 0.16);
}

.page-about .about-milestone .tag {
  display: inline-block;
  margin-bottom: 9px;
}

.page-about .about-milestone h3 {
  margin: 0 0 7px;
  font-size: 19px;
  line-height: 1.35;
  font-weight: 700;
  color: var(--snow);
}

.page-about .about-milestone p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mist);
  max-width: 60ch;
}

.page-about .about-timeline-media {
  margin: 30px 0 0;
}

.page-about .about-timeline-media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--ink-line);
}

/* 引文块 */
.page-about .about-pull {
  margin: 0;
  padding: 24px 22px;
  border-left: 3px solid var(--lime);
  background: var(--ink-700);
  border-radius: var(--radius);
  box-shadow: var(--stamp-shadow);
}

.page-about .about-pull p {
  margin: 0;
  font-size: 17px;
  line-height: 1.78;
  color: var(--snow);
  max-width: 44ch;
}

/* 团队分工 */
.page-about .about-team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: 24px;
}

.page-about .about-team-card {
  padding: 20px 20px 22px;
  background: var(--ink-700);
  border: 1px solid var(--ink-line);
  border-radius: var(--radius);
  box-shadow: var(--stamp-shadow);
}

.page-about .about-team-card-head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 11px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--ink-line);
}

.page-about .about-team-num {
  font-size: 30px;
  line-height: 1;
  font-weight: 700;
  color: var(--lime);
  letter-spacing: 0.02em;
}

.page-about .about-team-card h3 {
  margin: 0;
  font-size: 17px;
  font-weight: 600;
  color: var(--snow);
  letter-spacing: 0.02em;
}

.page-about .about-team-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}

/* 采编流程 */
.page-about .about-steps {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .about-step {
  padding: 18px 20px;
  border: 1px solid var(--ink-line);
  border-left: 3px solid var(--cyan);
  border-radius: var(--radius);
  display: grid;
  gap: 6px;
}

.page-about .about-step-idx {
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--amber);
}

.page-about .about-step h3 {
  margin: 0;
  font-size: 16px;
  font-weight: 600;
  color: var(--snow);
}

.page-about .about-step p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}

/* 服务地区列表 */
.page-about .about-region-list {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  border-top: 1px solid var(--ink-line);
}

.page-about .about-region-list li {
  display: flex;
  gap: 14px;
  align-items: baseline;
  padding: 13px 0;
  border-bottom: 1px solid var(--ink-line);
  font-size: 15px;
  color: var(--snow);
}

.page-about .about-region-list .mono {
  font-size: 12px;
  color: var(--lime);
  letter-spacing: 0.06em;
}

/* 客户构成 */
.page-about .about-clients {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin-top: 24px;
}

.page-about .about-client-card {
  padding: 18px 20px;
  background: var(--ink-700);
  border: 1px solid var(--ink-line);
  border-left: 3px solid var(--cyan);
  border-radius: var(--radius);
}

.page-about .about-client-card h3 {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 600;
  color: var(--snow);
}

.page-about .about-client-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}

/* 资质与里程碑 */
.page-about .about-honor-list {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  border-top: 1px solid var(--ink-line);
}

.page-about .about-honor-list > li {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 16px 0;
  border-bottom: 1px solid var(--ink-line);
}

.page-about .about-honor-year {
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--amber);
}

.page-about .about-honor-list p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--snow);
}

/* 结尾展签带 */
.page-about .about-closing {
  position: relative;
  margin-top: 88px;
  padding: 48px 0 52px;
  background:
    radial-gradient(120% 100% at 100% 0%, rgba(56, 224, 200, 0.08), transparent 62%),
    var(--ink-900);
  border-top: 1px solid var(--ink-line);
}

.page-about .about-closing::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--lime), var(--cyan) 55%, transparent);
}

.page-about .about-closing-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  align-items: center;
}

.page-about .about-closing-media {
  margin: 0;
}

.page-about .about-closing-media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--ink-line);
}

.page-about .about-closing-body h2 {
  margin: 0 0 12px;
  font-size: clamp(21px, 3vw, 29px);
  line-height: 1.3;
  font-weight: 700;
  color: var(--snow);
}

.page-about .about-closing-body p {
  margin: 0 0 22px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
  max-width: 56ch;
}

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

/* 平板及更宽 */
@media (min-width: 700px) {
  .page-about .about-lead-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

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

  .page-about .about-honor-list > li {
    grid-template-columns: minmax(0, 118px) minmax(0, 1fr);
    gap: 18px;
    align-items: baseline;
  }
}

/* 桌面端：左侧固定章节栏 + 右侧长卷正文 */
@media (min-width: 1024px) {
  .page-about .about-lead-grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    gap: 52px;
    align-items: center;
  }

  .page-about .about-flow-grid {
    grid-template-columns: var(--about-toc) minmax(0, 1fr);
    gap: 54px;
    align-items: start;
  }

  .page-about .about-toc {
    position: sticky;
    top: calc(var(--status-h) + 26px);
    align-self: start;
    border-top: none;
    border-left: 2px solid var(--ink-line);
    padding: 4px 0 4px 20px;
    max-height: calc(100vh - var(--status-h) - 52px);
    overflow-y: auto;
  }

  .page-about .about-content {
    max-width: 70ch;
  }

  .page-about .about-pull {
    margin-left: -20px;
    margin-right: 12%;
  }

  .page-about .about-closing-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 48px;
  }
}

/* 尊重减少动效偏好 */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-toc-list a {
    transition: none;
  }
}