.page-about {
  overflow-x: hidden;
}

/* ===== Hero 首屏 ===== */
.page-about .about-hero {
  position: relative;
  padding: 88px 0 76px;
  background:
    radial-gradient(ellipse 80% 62% at 12% 0%, rgba(30,144,255,0.18), transparent 58%),
    radial-gradient(ellipse 70% 52% at 92% 18%, rgba(255,127,80,0.12), transparent 52%),
    linear-gradient(rgba(48,54,61,0.32) 1px, transparent 1px),
    linear-gradient(90deg, rgba(48,54,61,0.32) 1px, transparent 1px),
    var(--bg);
  background-size: auto, auto, 42px 42px, 42px 42px, auto;
  border-bottom: 1px solid var(--border-soft);
}

.page-about .about-hero::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 40px;
  background: linear-gradient(135deg, transparent 49.6%, var(--bg) 50.4%);
  z-index: 1;
  pointer-events: none;
}

.page-about .about-hero-inner {
  position: relative;
  z-index: 2;
}

.page-about .about-hero-main {
  max-width: 760px;
}

.page-about .about-hero-index {
  margin: 0 0 4px;
  font-family: var(--font-display);
  font-size: 88px;
  line-height: 0.9;
  color: rgba(30,144,255,0.16);
  -webkit-text-stroke: 1px rgba(30,144,255,0.5);
  user-select: none;
}

.page-about .about-hero-title {
  margin: 12px 0 20px;
  font-family: var(--font-display);
  font-size: 52px;
  font-weight: 700;
  line-height: 0.98;
  letter-spacing: 0.01em;
  color: var(--text);
  text-transform: uppercase;
}

.page-about .about-hero-title-sub {
  display: block;
  margin-top: 16px;
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 600;
  line-height: 1.45;
  letter-spacing: 0;
  text-transform: none;
  color: rgba(230,237,243,0.82);
  max-width: 640px;
}

.page-about .about-hero-lead {
  margin: 0 0 24px;
  font-size: 17px;
  line-height: 1.7;
  color: var(--text-dim);
  max-width: 620px;
}

.page-about .about-hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
}

.page-about .about-hero-orbit {
  display: none;
}

/* ===== 始于 2016 年 ===== */
.page-about .about-origin-grid {
  display: grid;
  gap: 32px;
  align-items: center;
}

.page-about .about-origin-copy p {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.75;
  color: var(--text-dim);
}

.page-about .about-origin-copy p strong {
  color: var(--text);
}

.page-about .about-origin-points {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-origin-points li {
  position: relative;
  padding-left: 30px;
  font-size: 15px;
  line-height: 1.55;
  color: var(--text);
}

.page-about .about-origin-points li::before {
  content: '';
  position: absolute;
  left: 2px;
  top: 0.55em;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--blue);
  box-shadow: 0 0 0 4px rgba(30,144,255,0.14);
}

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

/* ===== 发展里程碑 ===== */
.page-about .about-milestone-chart-wrap {
  margin: 44px 0 36px;
  overflow: hidden;
}

.page-about .about-milestone-chart {
  display: block;
  width: 100%;
  height: auto;
  max-width: 680px;
  margin: 0 auto;
}

.page-about .about-timeline {
  position: relative;
  display: grid;
  gap: 30px;
  margin: 0;
  padding-left: 48px;
}

.page-about .about-timeline::before {
  content: '';
  position: absolute;
  left: 23px;
  top: 6px;
  bottom: 6px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(to bottom, var(--blue), var(--blue-bright) 55%, var(--orange));
}

.page-about .about-timeline-item {
  position: relative;
}

.page-about .about-timeline-marker {
  position: absolute;
  left: -47px;
  top: 10px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  width: 46px;
  text-align: center;
}

.page-about .about-timeline-node {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: var(--card-raised);
  border: 2px solid var(--blue);
  box-shadow: 0 0 0 6px rgba(30,144,255,0.12), var(--shadow-blue);
  font-family: var(--font-data);
  font-size: 13px;
  font-weight: 700;
  color: var(--blue-bright);
  letter-spacing: 0.02em;
}

.page-about .about-timeline-year {
  font-family: var(--font-data);
  font-size: 13px;
  font-weight: 500;
  color: var(--text-dim);
}

.page-about .about-timeline-card {
  padding: 24px;
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.page-about .about-timeline-card:hover {
  transform: translateY(-6px);
  border-color: rgba(30,144,255,0.45);
  box-shadow: var(--shadow-blue);
}

.page-about .about-timeline-card h3 {
  margin: 12px 0 8px;
  font-family: var(--font-display);
  font-size: 24px;
  line-height: 1.2;
  color: var(--text);
}

.page-about .about-timeline-card p {
  margin: 0 0 12px;
  font-size: 15px;
  line-height: 1.65;
  color: var(--text-dim);
}

.page-about .about-timeline-card ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 8px;
}

.page-about .about-timeline-card li {
  position: relative;
  padding-left: 20px;
  font-size: 14px;
  line-height: 1.55;
  color: var(--text);
}

.page-about .about-timeline-card li::before {
  content: '';
  position: absolute;
  left: 2px;
  top: 0.55em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--orange);
}

.page-about .about-timeline-item[data-visible="true"] {
  animation: pa-about-item-in 0.55s var(--ease-out) backwards;
}

.page-about .about-timeline-item:nth-child(2)[data-visible="true"] {
  animation-delay: 0.08s;
}

.page-about .about-timeline-item:nth-child(3)[data-visible="true"] {
  animation-delay: 0.16s;
}

.page-about .about-timeline-item:nth-child(4)[data-visible="true"] {
  animation-delay: 0.24s;
}

.page-about .about-milestones-cta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-top: 40px;
  padding: 20px 24px;
  border: 1px dashed var(--border);
  border-radius: var(--radius-md);
  background: rgba(22,27,34,0.65);
}

.page-about .about-milestones-cta p {
  flex: 1 1 100%;
  margin: 0 0 4px;
  font-size: 16px;
  font-weight: 600;
  color: var(--text);
}

/* ===== 团队与技术 ===== */
.page-about .about-team-grid {
  display: grid;
  gap: 32px;
  align-items: center;
}

.page-about .about-team-img {
  aspect-ratio: 10 / 7;
}

.page-about .about-team-copy h3 {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-size: 28px;
  line-height: 1.2;
  color: var(--text);
}

.page-about .about-team-copy p {
  margin: 0 0 14px;
  font-size: 16px;
  line-height: 1.75;
  color: var(--text-dim);
}

.page-about .about-team-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-top: 24px;
}

.page-about .about-team-stats .stat-card {
  padding: 18px 14px;
  text-align: center;
  background: linear-gradient(165deg, rgba(30,144,255,0.08), rgba(22,27,34,0.92) 60%);
  border-radius: var(--radius-md);
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.page-about .about-team-stats .stat-card:hover {
  transform: translateY(-4px);
  border-color: rgba(30,144,255,0.4);
  box-shadow: var(--shadow-blue);
}

.page-about .about-team-stats .stat-value {
  display: block;
  font-family: var(--font-data);
  font-size: 30px;
  line-height: 1.2;
  color: var(--text);
}

.page-about .about-team-stats .stat-value--orange {
  color: var(--orange);
}

.page-about .about-team-stats .stat-label {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  color: var(--text-dim);
}

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

.page-about .about-tech-band {
  padding: 20px 22px;
  border-left: 3px solid var(--blue);
  transition: transform var(--transition), box-shadow var(--transition);
}

.page-about .about-tech-band:nth-child(2) {
  border-left-color: var(--orange);
}

.page-about .about-tech-band:nth-child(3) {
  border-left-color: var(--green);
}

.page-about .about-tech-band:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card);
}

.page-about .about-tech-band h4 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 18px;
  letter-spacing: 0.02em;
  color: var(--text);
}

.page-about .about-tech-band p {
  margin: 0;
  font-size: 14px;
  line-height: 1.6;
  color: var(--text-dim);
}

/* ===== 未来愿景 ===== */
.page-about .about-vision-panel {
  display: grid;
  gap: 28px;
  padding: 32px 26px;
  background:
    radial-gradient(ellipse 70% 60% at 90% 8%, rgba(255,127,80,0.12), transparent 55%),
    radial-gradient(ellipse 50% 55% at 8% 100%, rgba(30,144,255,0.1), transparent 50%),
    var(--card);
  border-radius: var(--radius-lg);
}

.page-about .about-vision-copy p {
  margin: 0 0 14px;
  font-size: 16px;
  line-height: 1.75;
  color: var(--text-dim);
}

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

/* ===== 图片容器 ===== */
.page-about .img-wrapper img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about figcaption {
  margin-top: 10px;
  font-size: 13px;
  color: var(--text-dim);
  text-align: center;
}

/* ===== 平板 ===== */
@media (min-width: 768px) {
  .page-about .about-hero {
    padding: 104px 0 96px;
  }

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

  .page-about .about-hero-title {
    font-size: 76px;
  }

  .page-about .about-hero-title-sub {
    font-size: 20px;
  }

  .page-about .about-hero-lead {
    font-size: 19px;
  }

  .page-about .about-origin-grid {
    grid-template-columns: 1.05fr 0.95fr;
    gap: 48px;
  }

  .page-about .about-team-grid {
    grid-template-columns: 0.95fr 1.05fr;
    gap: 48px;
  }

  .page-about .about-team-stats {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-about .about-tech-bands {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-about .about-vision-panel {
    grid-template-columns: 1fr 0.8fr;
    gap: 44px;
    padding: 48px;
  }

  .page-about .about-milestones-cta p {
    flex: 0 1 auto;
    margin: 0 16px 0 0;
  }
}

/* ===== 桌面 ===== */
@media (min-width: 1024px) {
  .page-about .about-hero-inner {
    display: grid;
    grid-template-columns: 1fr 300px;
    align-items: center;
    gap: 32px;
  }

  .page-about .about-hero-title {
    font-size: 84px;
  }

  .page-about .about-hero-orbit {
    display: block;
    animation: pa-about-orbit-spin 36s linear infinite;
  }

  .page-about .about-timeline {
    padding-left: 0;
    gap: 36px;
  }

  .page-about .about-timeline::before {
    left: 50%;
    top: 8px;
    bottom: 8px;
    transform: translateX(-1px);
  }

  .page-about .about-timeline-item {
    display: grid;
    grid-template-columns: 1fr 96px 1fr;
    align-items: center;
  }

  .page-about .about-timeline-marker {
    position: relative;
    left: auto;
    top: auto;
    width: auto;
    grid-column: 2;
    grid-row: 1;
  }

  .page-about .about-timeline-card {
    grid-row: 1;
    max-width: 480px;
  }

  .page-about .about-timeline-item:nth-child(odd) .about-timeline-card {
    grid-column: 3;
    justify-self: start;
  }

  .page-about .about-timeline-item:nth-child(even) .about-timeline-card {
    grid-column: 1;
    justify-self: end;
  }
}

@keyframes pa-about-orbit-spin {
  to {
    transform: rotate(360deg);
  }
}

@keyframes pa-about-item-in {
  from {
    opacity: 0;
    transform: translateY(18px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}