.page-about {
  --about-sticky: 108px;
  background: var(--canvas);
  overflow-x: hidden;
}

.page-about .about-crumb {
  padding-top: 20px;
}

.page-about .breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--ink-600);
}

.page-about .breadcrumb-list li:not(:last-child)::after {
  content: "/";
  margin-left: 6px;
  color: var(--line-200);
}

.page-about .breadcrumb-link {
  color: var(--ink-600);
  text-decoration: none;
}

.page-about .breadcrumb-link:hover,
.page-about .breadcrumb-link:focus-visible {
  color: var(--blue-600);
}

.page-about .breadcrumb-current {
  color: var(--blue-900);
  font-weight: 600;
}

/* ---------- 首屏框景 ---------- */
.page-about .about-frame {
  position: relative;
  overflow: hidden;
  background: var(--paper);
  border-radius: var(--r-lg);
}

.page-about .about-frame .rule-scale {
  margin: 0;
}

.page-about .about-hero-grid {
  display: grid;
  gap: 30px;
  padding: 26px 22px 30px;
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  font-size: clamp(30px, 5.4vw, 46px);
  line-height: 1.18;
  letter-spacing: -0.01em;
  font-weight: 700;
  color: var(--ink-900);
}

.page-about .about-hero-lead {
  margin: 18px 0 0;
  max-width: 46ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-600);
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-hero-side {
  align-self: stretch;
}

.page-about .about-facts {
  margin: 0;
  padding: 10px 16px;
  list-style: none;
  display: grid;
  gap: 2px;
  background: var(--blue-50);
  border-radius: var(--r-md);
}

.page-about .about-fact {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 13px 4px;
  border-bottom: 1px solid var(--line-200);
}

.page-about .about-fact:last-child {
  border-bottom: 0;
}

.page-about .about-fact-num {
  flex: none;
  min-width: 84px;
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 600;
  line-height: 1.1;
  color: var(--blue-700);
}

.page-about .about-fact-unit {
  font-size: 14px;
  margin-left: 2px;
}

.page-about .about-fact-label {
  font-size: 14px;
  line-height: 1.6;
  color: var(--ink-600);
}

.page-about .about-fact--accent .about-fact-num {
  color: var(--orange-600);
}

/* ---------- 品牌起点 ---------- */
.page-about .about-origin-grid {
  display: grid;
  gap: 30px;
}

.page-about .about-origin-text p {
  margin: 16px 0 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-600);
}

.page-about .about-origin-note {
  padding: 4px 0 4px 20px;
  border-left: 2px solid var(--orange-500);
}

.page-about .about-note-label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--orange-600);
  font-weight: 600;
}

.page-about .about-note-text {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-600);
}

/* ---------- 发展历程 ---------- */
.page-about .about-timeline .section-head {
  max-width: 62ch;
  margin-bottom: 34px;
}

.page-about .timeline-grid {
  display: grid;
  gap: 26px;
}

.page-about .year-rail-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .year-link {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 7px 12px;
  border-radius: var(--pill);
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--ink-600);
  text-decoration: none;
  transition: color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .year-link::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--blue-100);
  transition: transform 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .year-link:hover,
.page-about .year-link:focus-visible {
  background: var(--blue-50);
  color: var(--blue-700);
}

.page-about .year-link:hover::before,
.page-about .year-link:focus-visible::before {
  background: var(--blue-600);
}

.page-about .year-link.is-current {
  background: var(--paper);
  color: var(--ink-900);
  font-weight: 600;
  box-shadow: 0 6px 18px -14px rgba(11, 42, 111, 0.7);
}

.page-about .year-link.is-current::before {
  background: var(--orange-500);
  transform: scale(1.4);
}

.page-about .about-timeline-figure {
  margin: 0 0 30px;
  border-radius: var(--r-md);
  overflow: hidden;
  background: var(--blue-100);
}

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

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

.page-about .timeline-item {
  position: relative;
  padding: 0 0 32px 26px;
  border-left: 2px solid var(--line-200);
  scroll-margin-top: var(--about-sticky);
}

.page-about .timeline-item:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}

.page-about .timeline-item::before {
  content: "";
  position: absolute;
  left: -7px;
  top: 5px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--paper);
  border: 2px solid var(--blue-600);
}

.page-about .timeline-item.is-current::before {
  background: var(--orange-500);
  border-color: var(--orange-500);
  box-shadow: 0 0 0 5px var(--orange-100);
}

.page-about .timeline-year {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--blue-700);
}

.page-about .timeline-title {
  margin: 7px 0 0;
  font-size: 19px;
  font-weight: 600;
  line-height: 1.45;
  color: var(--ink-900);
}

.page-about .timeline-text {
  margin: 9px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-600);
}

/* ---------- 服务场景 ---------- */
.page-about .scenes-grid {
  display: grid;
  gap: 30px;
}

.page-about .scene-blocks {
  display: grid;
  gap: 14px;
  margin-top: 28px;
}

.page-about .scene-block {
  padding: 20px 20px 22px;
}

.page-about .scene-block h3 {
  margin: 0;
  font-size: 17px;
  font-weight: 600;
  color: var(--ink-900);
}

.page-about .scene-block p {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-600);
}

.page-about .scene-block--a {
  background: var(--blue-50);
  border-radius: 28px 10px 28px 28px;
}

.page-about .scene-block--b {
  background: var(--blue-100);
  border-radius: 10px 28px 28px 28px;
}

.page-about .scene-block--c {
  background: var(--orange-100);
  border-radius: 28px 28px 10px 28px;
}

.page-about .scene-block--d {
  background: var(--paper);
  border: 1px solid var(--line-200);
  border-radius: 28px 28px 28px 10px;
}

.page-about .about-scenes-figure {
  margin: 0;
  border-radius: var(--r-lg);
  overflow: hidden;
  background: var(--blue-50);
}

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

.page-about .scenes-note {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 24px;
  margin: 32px 0 0;
  padding: 16px 20px;
  border-radius: var(--r-sm);
  background: var(--blue-50);
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--blue-900);
}

.page-about .scenes-note span {
  position: relative;
  padding-left: 12px;
}

.page-about .scenes-note span::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 5px;
  height: 5px;
  margin-top: -2.5px;
  border-radius: 50%;
  background: var(--orange-500);
}

/* ---------- 发布机制 ---------- */
.page-about .release-grid {
  display: grid;
  gap: 34px;
}

.page-about .flow {
  margin: 6px 0 24px;
}

.page-about .flow svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .release-steps .path-list {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .path-step {
  position: relative;
  padding: 18px 20px 18px 58px;
  border-radius: var(--r-md);
  background: var(--canvas);
}

.page-about .path-step .path-index {
  position: absolute;
  left: 20px;
  top: 20px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  color: var(--orange-600);
}

.page-about .path-step .path-title {
  margin: 0;
  font-size: 17px;
  font-weight: 600;
  color: var(--ink-900);
}

.page-about .path-step .path-text {
  margin: 7px 0 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--ink-600);
}

.page-about .about-release-figure {
  margin: 0;
  border-radius: var(--r-lg);
  overflow: hidden;
  background: var(--blue-50);
}

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

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  gap: 30px;
}

.page-about .team-stats {
  display: grid;
  gap: 14px;
  align-content: start;
}

.page-about .team-stat {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 20px 22px;
  border-radius: var(--r-md);
  background: var(--blue-50);
}

.page-about .team-stat-num {
  font-family: var(--font-mono);
  font-size: 34px;
  font-weight: 600;
  line-height: 1;
  color: var(--blue-700);
}

.page-about .team-stat-label {
  font-size: 14px;
  color: var(--ink-600);
}

.page-about .team-text p {
  margin: 0 0 14px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-600);
}

.page-about .team-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .team-tags li {
  padding: 6px 12px;
  border-radius: var(--pill);
  background: var(--blue-100);
  color: var(--blue-900);
  font-family: var(--font-mono);
  font-size: 12px;
}

/* ---------- 品牌承诺 ---------- */
.page-about .pledge-panel {
  position: relative;
  overflow: hidden;
  max-width: 880px;
  padding: 28px 22px 32px;
  border-radius: var(--r-lg);
  background: var(--paper);
  box-shadow: var(--shadow-soft);
}

.page-about .pledge-panel::after {
  content: "";
  position: absolute;
  right: -70px;
  bottom: -80px;
  width: 220px;
  height: 220px;
  border-radius: 46% 54% 40% 60%;
  background: var(--orange-100);
  opacity: 0.75;
}

.page-about .pledge-panel > * {
  position: relative;
  z-index: 1;
}

.page-about .pledge-text {
  margin: 16px 0 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-600);
  max-width: 56ch;
}

.page-about .pledge-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.page-about .pledge-meta {
  margin: 22px 0 0;
  font-size: 13px;
  line-height: 1.8;
  color: var(--ink-600);
  font-family: var(--font-mono);
}

.page-about .pledge-meta a {
  color: var(--orange-600);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .pledge-meta a:hover,
.page-about .pledge-meta a:focus-visible {
  color: var(--blue-700);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .scene-blocks {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-hero-grid {
    padding: 32px 30px 36px;
  }

  .page-about .pledge-panel {
    padding: 40px 36px 44px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 0.85fr);
    gap: 48px;
    align-items: start;
    padding: 46px 44px 48px;
  }

  .page-about .about-origin-grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 0.65fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .team-grid {
    grid-template-columns: minmax(0, 0.62fr) minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }
}

@media (min-width: 940px) {
  .page-about .scenes-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.82fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .release-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.78fr);
    gap: 48px;
    align-items: center;
  }
}

@media (min-width: 960px) {
  .page-about .timeline-grid {
    grid-template-columns: 168px minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .year-rail {
    position: sticky;
    top: var(--about-sticky);
  }

  .page-about .year-rail-list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 3px;
  }

  .page-about .year-link {
    width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .year-link,
  .page-about .year-link::before {
    transition: none;
  }
}