.page-about {
  --about-orange: #FF4B1F;
  --about-deep-blue: #0A1A3F;
  --about-yellow: #FFC300;
  --about-ink: #111111;
  --about-pure-white: #FFFFFF;
  --about-off-white: #F5F5F3;
  --about-border-gray: #E0E0DD;
  --about-muted-gray: #6B6B6B;
  --about-charcoal: #333333;
  --about-font-display: "Anton", "Impact", "Noto Sans SC", "PingFang SC", sans-serif;
  --about-font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --about-page-margin: 4vw;
  --about-radius: 2px;
}

.page-about *,
.page-about *::before,
.page-about *::after {
  box-sizing: border-box;
}

.page-about .container,
.page-about .container--wide {
  width: 100%;
  max-width: 1440px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 4vw;
  padding-right: 4vw;
}

.page-about .breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-family: var(--about-font-body);
  color: var(--about-muted-gray);
  padding-top: 20px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--about-border-gray);
}

.page-about .breadcrumb a {
  color: var(--about-muted-gray);
  text-decoration: none;
  transition: color 200ms ease;
}

.page-about .breadcrumb a:hover {
  color: var(--about-orange);
}

.page-about .breadcrumb-sep {
  color: var(--about-border-gray);
}

.page-about .breadcrumb-current {
  color: var(--about-ink);
  font-weight: 500;
}

.page-about .section-kicker {
  display: inline-block;
  font-family: var(--about-font-body);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--about-orange);
  margin-bottom: 12px;
  position: relative;
  padding-left: 20px;
}

.page-about .section-kicker::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 12px;
  height: 2px;
  background: var(--about-orange);
}

.page-about .section-title {
  font-family: var(--about-font-display);
  font-weight: 400;
  font-size: 32px;
  line-height: 1.15;
  color: var(--about-ink);
  margin-bottom: 32px;
  letter-spacing: 0.01em;
  text-transform: uppercase;
}

.page-about .section-title--sm {
  font-size: 24px;
}

.page-about [data-reveal] {
  opacity: 1;
  transform: translateY(0);
  transition: opacity 600ms ease, transform 600ms ease;
}

/* ===== 首屏 hero ===== */
.page-about .about-hero {
  position: relative;
  padding-top: 48px;
  padding-bottom: 48px;
  display: flex;
  gap: 40px;
  overflow: hidden;
  background: var(--about-pure-white);
}

.page-about .about-hero-left {
  flex: 1;
}

.page-about .about-hero-left .display-title {
  font-family: var(--about-font-display);
  font-size: clamp(48px, 8vw, 80px);
  line-height: 0.95;
  margin: 0 0 20px 0;
  color: var(--about-ink);
  text-transform: uppercase;
  letter-spacing: 0.01em;
}

.page-about .about-hero-lead {
  font-family: var(--about-font-body);
  font-size: 16px;
  line-height: 1.7;
  color: var(--about-charcoal);
  max-width: 520px;
}

.page-about .about-hero-side {
  position: relative;
  display: flex;
  align-items: flex-start;
  justify-content: flex-end;
  width: 120px;
  flex-shrink: 0;
}

.page-about .hero-scroll-word {
  position: absolute;
  right: 0;
  top: 0;
  font-family: var(--about-font-display);
  font-size: 72px;
  line-height: 1;
  color: var(--about-off-white);
  writing-mode: vertical-rl;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  user-select: none;
  pointer-events: none;
}

.page-about .hero-orange-bar {
  position: absolute;
  right: 32px;
  top: 0;
  bottom: 0;
  width: 8px;
  background: var(--about-orange);
  transform: skewX(-10deg);
}

/* ===== 平台是什么 ===== */
.page-about .about-intro {
  background: var(--about-pure-white);
  padding-top: 48px;
  padding-bottom: 48px;
}

.page-about .about-intro .container {
  max-width: 1440px;
}

.page-about .about-intro-grid {
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.page-about .about-intro-main {
  font-family: var(--about-font-body);
  font-size: 18px;
  line-height: 1.8;
  color: var(--about-charcoal);
  max-width: 640px;
  margin: 0;
}

.page-about .about-intro-main strong {
  color: var(--about-ink);
  font-weight: 600;
}

.page-about .about-intro-aside {
  background: var(--about-deep-blue);
  padding: 24px;
  display: flex;
  align-items: center;
  gap: 16px;
  max-width: 320px;
}

.page-about .intro-aside-num {
  font-family: var(--about-font-display);
  font-size: 44px;
  line-height: 1;
  color: var(--about-pure-white);
  white-space: nowrap;
}

.page-about .intro-aside-unit {
  font-size: 20px;
  margin-left: 2px;
  color: var(--about-yellow);
}

.page-about .about-intro-aside p {
  font-family: var(--about-font-body);
  font-size: 13px;
  line-height: 1.6;
  color: #B8C0C9;
  margin: 0;
}

/* ===== 关键数字 ===== */
.page-about .about-stats {
  background: var(--about-off-white);
  border-top: 1px solid var(--about-border-gray);
  border-bottom: 1px solid var(--about-border-gray);
  padding-top: 48px;
  padding-bottom: 48px;
}

.page-about .stats-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 32px;
}

.page-about .stat-item {
  background: var(--about-pure-white);
  border: 1px solid var(--about-border-gray);
  padding: 20px 16px;
  text-align: center;
  transition: transform 200ms ease, box-shadow 200ms ease;
}

.page-about .stat-item:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 24px rgba(10, 26, 63, 0.08);
}

.page-about .stat-item .data-num {
  display: block;
  font-family: var(--about-font-display);
  font-size: 32px;
  line-height: 1;
  color: var(--about-ink);
  margin-bottom: 8px;
}

.page-about .stat-item .data-num--orange {
  color: var(--about-orange);
}

.page-about .stat-item p {
  font-family: var(--about-font-body);
  font-size: 13px;
  color: var(--about-muted-gray);
  margin: 0;
}

.page-about .stat-item--highlight {
  background: var(--about-ink);
  border-color: var(--about-ink);
}

.page-about .stat-item--highlight .data-num {
  color: var(--about-yellow);
}

.page-about .stat-item--highlight p {
  color: #FFF;
}

.page-about .stats-note {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  background: var(--about-pure-white);
  border-left: 4px solid var(--about-orange);
  padding: 16px;
}

.page-about .stats-note-mark {
  font-family: var(--about-font-display);
  font-size: 20px;
  color: var(--about-orange);
  line-height: 1;
  margin-top: 2px;
}

.page-about .stats-note p {
  font-family: var(--about-font-body);
  font-size: 13px;
  line-height: 1.7;
  color: var(--about-charcoal);
  margin: 0;
}

/* ===== 发展里程碑 ===== */
.page-about .about-milestones {
  background: var(--about-deep-blue);
  padding-top: 48px;
  padding-bottom: 48px;
}

.page-about .about-milestones .section-title {
  color: var(--about-pure-white);
}

.page-about .milestones-head {
  display: flex;
  flex-direction: column;
  margin-bottom: 36px;
}

.page-about .milestones-tip {
  font-family: var(--about-font-body);
  font-size: 13px;
  color: #B8C0C9;
  margin-top: 4px;
}

.page-about .milestones-layout {
  display: flex;
  flex-direction: column;
  gap: 36px;
}

.page-about .timeline {
  position: relative;
  padding-left: 16px;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: rgba(255, 255, 255, 0.2);
}

.page-about .timeline-item {
  position: relative;
  padding-bottom: 32px;
}

.page-about .timeline-item::before {
  content: "";
  position: absolute;
  left: -14px;
  top: 8px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--about-orange);
  border: 2px solid var(--about-deep-blue);
  box-shadow: 0 0 0 2px rgba(255, 75, 31, 0.4);
}

.page-about .timeline-item-inner {
  cursor: pointer;
  background: rgba(255, 255, 255, 0.05);
  border-radius: var(--about-radius);
  padding: 20px;
  transition: background 200ms ease, transform 200ms ease;
}

.page-about .timeline-item-inner:hover {
  background: rgba(255, 255, 255, 0.1);
  transform: translateX(4px);
}

.page-about .timeline-item[data-visible] .timeline-item-inner {
  background: rgba(255, 75, 31, 0.12);
}

.page-about .timeline-year {
  display: inline-block;
  font-family: var(--about-font-display);
  font-size: 36px;
  line-height: 1;
  color: var(--about-orange);
  margin-bottom: 12px;
  letter-spacing: 0.02em;
}

.page-about .timeline-content h3 {
  font-family: var(--about-font-display);
  font-size: 22px;
  line-height: 1.25;
  color: var(--about-pure-white);
  margin: 0 0 8px 0;
  font-weight: 400;
  text-transform: uppercase;
}

.page-about .timeline-content p {
  font-family: var(--about-font-body);
  font-size: 14px;
  line-height: 1.7;
  color: #B8C0C9;
  margin: 0 0 10px 0;
}

.page-about .timeline-more {
  font-family: var(--about-font-body);
  font-size: 12px;
  font-weight: 600;
  color: var(--about-orange);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.page-about .timeline-detail {
  display: none;
  margin-top: 12px;
  padding: 16px;
  background: rgba(255, 195, 0, 0.08);
  border-left: 3px solid var(--about-yellow);
}

.page-about .timeline-detail p {
  font-family: var(--about-font-body);
  font-size: 14px;
  line-height: 1.7;
  color: #DCE1E8;
  margin: 0;
}

.page-about .timeline-item[data-detail-open] .timeline-detail {
  display: block;
}

.page-about .timeline-item[data-detail-open] .timeline-more::after {
  content: " 收起";
}

.page-about .timeline-item[data-detail-open] .timeline-more {
  color: var(--about-yellow);
}

.page-about .timeline-figure {
  margin: 0;
  max-width: 100%;
}

.page-about .timeline-figure img {
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border-radius: var(--about-radius);
  filter: grayscale(30%) contrast(1.1);
}

/* ===== 资质与认可 ===== */
.page-about .about-cert {
  background: var(--about-pure-white);
  padding-top: 48px;
  padding-bottom: 48px;
}

.page-about .cert-layout {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.page-about .cert-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.page-about .cert-item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 20px;
  border: 1px solid var(--about-border-gray);
  background: var(--about-off-white);
  transition: border-color 200ms ease, background 200ms ease;
}

.page-about .cert-item:hover {
  background: var(--about-pure-white);
  border-color: var(--about-ink);
}

.page-about .cert-badge {
  font-family: var(--about-font-display);
  font-size: 16px;
  line-height: 1;
  background: var(--about-orange);
  color: #FFF;
  padding: 12px 10px;
  text-transform: uppercase;
  white-space: nowrap;
  flex-shrink: 0;
  min-width: 64px;
  text-align: center;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%);
}

.page-about .cert-badge--yellow {
  background: var(--about-yellow);
  color: var(--about-ink);
}

.page-about .cert-content h3 {
  font-family: var(--about-font-body);
  font-size: 16px;
  font-weight: 600;
  color: var(--about-ink);
  margin: 0 0 6px 0;
}

.page-about .cert-content p {
  font-family: var(--about-font-body);
  font-size: 14px;
  line-height: 1.7;
  color: var(--about-charcoal);
  margin: 0;
}

.page-about .cert-figure {
  margin: 0;
}

.page-about .cert-figure img {
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border-radius: var(--about-radius);
}

/* ===== 我们的团队 ===== */
.page-about .about-team {
  background: var(--about-off-white);
  border-top: 1px solid var(--about-border-gray);
  border-bottom: 1px solid var(--about-border-gray);
  padding-top: 48px;
  padding-bottom: 48px;
}

.page-about .team-layout {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.page-about .team-figure {
  margin: 0;
}

.page-about .team-figure img {
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border-radius: var(--about-radius);
  filter: grayscale(20%);
}

.page-about .team-content > p {
  font-family: var(--about-font-body);
  font-size: 16px;
  line-height: 1.7;
  color: var(--about-charcoal);
  margin: 0 0 28px 0;
}

.page-about .team-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.page-about .team-list li {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  background: var(--about-pure-white);
  border: 1px solid var(--about-border-gray);
  padding: 16px;
  transition: transform 200ms ease, border-color 200ms ease;
}

.page-about .team-list li:hover {
  transform: translateX(4px);
  border-color: var(--about-orange);
}

.page-about .team-list-icon {
  font-family: var(--about-font-display);
  font-size: 20px;
  line-height: 1;
  color: var(--about-orange);
  flex-shrink: 0;
  margin-top: 2px;
}

.page-about .team-list h3 {
  font-family: var(--about-font-body);
  font-size: 15px;
  font-weight: 600;
  color: var(--about-ink);
  margin: 0 0 6px 0;
}

.page-about .team-list p {
  font-family: var(--about-font-body);
  font-size: 14px;
  line-height: 1.7;
  color: var(--about-charcoal);
  margin: 0;
}

/* ===== 延伸阅读 ===== */
.page-about .about-links {
  background: var(--about-pure-white);
  padding-top: 40px;
  padding-bottom: 40px;
}

.page-about .links-grid {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.page-about .link-card {
  display: block;
  background: var(--about-off-white);
  border: 1px solid var(--about-border-gray);
  padding: 20px;
  text-decoration: none;
  position: relative;
  transition: background 200ms ease, border-color 200ms ease, transform 200ms ease;
}

.page-about .link-card:hover {
  background: var(--about-pure-white);
  border-color: var(--about-ink);
  transform: translateY(-2px);
}

.page-about .link-card--dark {
  background: var(--about-deep-blue);
  border-color: var(--about-deep-blue);
}

.page-about .link-card--dark:hover {
  background: var(--about-ink);
  border-color: var(--about-orange);
}

.page-about .link-card-kicker {
  display: block;
  font-family: var(--about-font-body);
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--about-orange);
  margin-bottom: 8px;
}

.page-about .link-card-title {
  display: block;
  font-family: var(--about-font-body);
  font-size: 16px;
  font-weight: 500;
  line-height: 1.6;
  color: var(--about-ink);
  padding-right: 32px;
}

.page-about .link-card--dark .link-card-title {
  color: var(--about-pure-white);
}

.page-about .link-card-arrow {
  position: absolute;
  right: 18px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 22px;
  color: var(--about-orange);
}

@media (min-width: 768px) {
  .page-about .about-hero {
    padding-top: 72px;
    padding-bottom: 72px;
  }

  .page-about .about-hero-left .display-title {
    font-size: clamp(56px, 7vw, 96px);
  }

  .page-about .about-hero-lead {
    font-size: 18px;
    max-width: 560px;
  }

  .page-about .about-hero-side {
    width: 180px;
  }

  .page-about .hero-scroll-word {
    font-size: 120px;
  }

  .page-about .section-title {
    font-size: 44px;
  }

  .page-about .section-title--sm {
    font-size: 28px;
  }

  .page-about .about-intro {
    padding-top: 72px;
    padding-bottom: 72px;
  }

  .page-about .about-intro-grid {
    flex-direction: row;
    align-items: flex-start;
    gap: 60px;
  }

  .page-about .about-intro-main {
    font-size: 20px;
    max-width: 640px;
  }

  .page-about .about-intro-aside {
    margin-left: auto;
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
    padding: 28px;
    max-width: 300px;
  }

  .page-about .about-intro-aside .intro-aside-num {
    font-size: 56px;
  }

  .page-about .about-stats {
    padding-top: 72px;
    padding-bottom: 72px;
  }

  .page-about .stats-grid {
    grid-template-columns: repeat(6, 1fr);
    gap: 12px;
  }

  .page-about .stat-item {
    padding: 28px 12px;
  }

  .page-about .stat-item .data-num {
    font-size: 40px;
  }

  .page-about .stats-note {
    padding: 20px 24px;
  }

  .page-about .about-milestones {
    padding-top: 72px;
    padding-bottom: 72px;
  }

  .page-about .milestones-head {
    flex-direction: row;
    align-items: flex-end;
    justify-content: space-between;
  }

  .page-about .milestones-head .section-title {
    margin-bottom: 0;
  }

  .page-about .milestones-tip {
    margin-top: 0;
  }

  .page-about .milestones-layout {
    flex-direction: row;
    gap: 60px;
  }

  .page-about .timeline {
    flex: 1.3;
    padding-left: 24px;
  }

  .page-about .timeline::before {
    left: 6px;
  }

  .page-about .timeline-item::before {
    left: -18px;
    width: 12px;
    height: 12px;
  }

  .page-about .timeline-item-inner {
    padding: 24px;
  }

  .page-about .timeline-figure {
    flex: 1;
    position: sticky;
    top: 120px;
    align-self: flex-start;
  }

  .page-about .about-cert {
    padding-top: 72px;
    padding-bottom: 72px;
  }

  .page-about .cert-layout {
    flex-direction: row-reverse;
    align-items: flex-start;
    gap: 60px;
  }

  .page-about .cert-list {
    flex: 1.2;
  }

  .page-about .cert-figure {
    flex: 1;
    position: sticky;
    top: 120px;
  }

  .page-about .cert-item {
    padding: 24px;
  }

  .page-about .about-team {
    padding-top: 72px;
    padding-bottom: 72px;
  }

  .page-about .team-layout {
    flex-direction: row;
    align-items: center;
    gap: 60px;
  }

  .page-about .team-figure {
    flex: 1;
  }

  .page-about .team-content {
    flex: 1.2;
  }

  .page-about .team-list {
    gap: 8px;
  }

  .page-about .team-list li {
    padding: 20px;
  }

  .page-about .about-links {
    padding-top: 56px;
    padding-bottom: 56px;
  }

  .page-about .links-grid {
    flex-direction: row;
    gap: 16px;
  }

  .page-about .link-card {
    flex: 1;
    min-height: 160px;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
  }
}

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

  .page-about .timeline-item-inner,
  .page-about .stat-item,
  .page-about .cert-item,
  .page-about .team-list li,
  .page-about .link-card {
    transition: none !important;
  }
}