.page-about {
  position: relative;
  overflow-x: hidden;
  background-color: var(--bg-ink);
  color: var(--text);
  font-family: var(--font-body);
}

.page-about .container {
  position: relative;
  z-index: 1;
}

/* 园林窗格纹理 */
.page-about .about-lattice-texture {
  position: absolute;
  top: 0;
  right: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  opacity: 0.07;
  background-image:
    radial-gradient(circle at center, transparent 16px, var(--line) 17px, transparent 18px),
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 88px 88px;
  -webkit-mask-image: linear-gradient(to right, rgba(0, 0, 0, 0.7), transparent 75%);
  mask-image: linear-gradient(to right, rgba(0, 0, 0, 0.7), transparent 75%);
}

/* 品牌简介 */
.page-about .about-intro {
  position: relative;
  padding: 32px 0 56px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-intro::after {
  content: '';
  position: absolute;
  right: 0;
  bottom: -1px;
  height: 4px;
  width: 40%;
  background: linear-gradient(90deg, var(--neon), var(--plasma));
}

.page-about .about-intro-grid {
  display: grid;
  gap: 32px;
  align-items: center;
}

.page-about .about-intro-copy {
  position: relative;
}

.page-about .about-intro-copy h1 {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 5vw, 3.25rem);
  line-height: 1.12;
  margin: 12px 0 18px;
  letter-spacing: 0.01em;
  text-transform: uppercase;
}

.page-about .about-intro-lead {
  font-size: 1.125rem;
  line-height: 1.6;
  color: var(--neon);
  border-left: 3px solid var(--plasma);
  padding-left: 16px;
  margin: 0 0 16px;
}

.page-about .about-intro-text {
  color: var(--text-dim);
  line-height: 1.8;
  margin: 0 0 24px;
  font-size: 0.9375rem;
}

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

.page-about .about-intro-media {
  position: relative;
}

.page-about .about-intro-media::before {
  content: '';
  position: absolute;
  top: 12px;
  left: 12px;
  right: -12px;
  bottom: -12px;
  border: 1px solid var(--line);
  pointer-events: none;
}

.page-about .about-intro-media .media-frame {
  position: relative;
  z-index: 1;
  margin: 0;
  height: auto;
  aspect-ratio: 4 / 3;
  padding: 0;
  background-color: var(--bg-panel);
  border: 1px solid var(--line);
  overflow: hidden;
}

.page-about .about-intro-media .media-frame img {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: cover;
}

/* 数据快照 */
.page-about .about-snapshot {
  padding: 28px 0;
  background-color: var(--bg-panel);
  border-bottom: 1px solid var(--line);
}

.page-about .about-snapshot-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}

.page-about .about-snapshot-item {
  padding: 18px 16px;
  background-color: var(--bg-panel-2);
  border: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  gap: 6px;
  transition: border-color var(--transition);
}

.page-about .about-snapshot-item:hover {
  border-color: var(--neon);
}

.page-about .about-snapshot-num {
  font-family: var(--font-mono);
  font-size: 1.75rem;
  line-height: 1;
  color: var(--neon);
}

.page-about .about-snapshot-label {
  font-size: 0.8125rem;
  color: var(--text-dim);
}

/* 发展历程 */
.page-about .about-timeline-section {
  padding: 60px 0;
}

.page-about .about-timeline-wrap {
  margin-top: 36px;
}

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

.page-about .about-timeline::before {
  content: '';
  position: absolute;
  left: 14px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--neon), var(--line) 30%, var(--line) 70%, var(--plasma));
}

.page-about .timeline-item {
  position: relative;
  padding-left: 48px;
  margin-bottom: 28px;
}

.page-about .timeline-marker {
  position: absolute;
  left: 0;
  top: 6px;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.page-about .timeline-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--neon);
  box-shadow: 0 0 10px rgba(57, 255, 20, 0.55);
}

.page-about .timeline-content {
  background-color: var(--bg-panel);
  border: 1px solid var(--line);
  border-left: 3px solid var(--neon);
  padding: 20px 20px 18px;
}

.page-about .timeline-content h3 {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  line-height: 1.3;
  margin: 0 0 8px;
  letter-spacing: 0.02em;
  color: var(--text);
  text-align: left;
}

.page-about .timeline-content p {
  margin: 0;
  color: var(--text-dim);
  line-height: 1.75;
  font-size: 0.9375rem;
  text-align: left;
}

.page-about .timeline-figure {
  margin: 16px 0 0;
  text-align: left;
}

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

/* 数据服务能力 */
.page-about .about-capability {
  padding: 56px 0;
  background-color: var(--bg-panel);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-capability-grid {
  display: grid;
  gap: 16px;
  margin-top: 32px;
}

.page-about .about-capability-card {
  background-color: var(--bg-ink);
  border: 1px solid var(--line);
  padding: 24px;
  transition: border-color var(--transition), transform var(--transition);
}

.page-about .about-capability-card:hover {
  border-color: var(--neon);
  transform: translateY(-4px);
}

.page-about .about-capability-index {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.12em;
  color: var(--plasma);
  display: inline-block;
  margin-bottom: 12px;
}

.page-about .about-capability-card h3 {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  margin: 0 0 10px;
  letter-spacing: 0.02em;
  color: var(--text);
}

.page-about .about-capability-card p {
  margin: 0;
  color: var(--text-dim);
  line-height: 1.75;
  font-size: 0.9375rem;
}

/* 资质与合作 */
.page-about .about-trust {
  position: relative;
  padding: 56px 0;
}

.page-about .about-trust::before {
  content: '';
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.05;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 36px 36px;
}

.page-about .about-trust-grid {
  display: grid;
  gap: 36px;
  align-items: start;
}

.page-about .about-trust-cert {
  display: flex;
  gap: 18px;
  align-items: flex-start;
  margin-top: 24px;
}

.page-about .about-trust-cert .cert-badge {
  flex-shrink: 0;
  width: 84px;
  height: 84px;
  border: 2px solid var(--neon);
  background-color: rgba(57, 255, 20, 0.08);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.page-about .cert-badge-code {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  color: var(--neon);
}

.page-about .cert-badge-num {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text);
}

.page-about .about-trust-cert-text h3,
.page-about .about-trust-partners h3 {
  font-family: var(--font-heading);
  font-size: 1.125rem;
  margin: 0 0 8px;
  color: var(--text);
}

.page-about .about-trust-cert-text p,
.page-about .about-trust-partners p {
  margin: 0;
  color: var(--text-dim);
  line-height: 1.7;
  font-size: 0.9375rem;
}

.page-about .about-trust-partners {
  margin-top: 28px;
  padding-left: 16px;
  border-left: 3px solid var(--plasma);
}

.page-about .about-trust-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}

.page-about .about-trust-media {
  text-align: center;
}

.page-about .about-trust-figure {
  margin: 0;
  padding: 12px;
  background-color: var(--bg-panel);
  border: 1px solid var(--line);
}

.page-about .about-trust-figure img {
  width: 100%;
  height: auto;
  display: block;
}

.page-about .about-trust-note {
  margin: 16px 0 0;
  font-size: 0.875rem;
  color: var(--text-dim);
  line-height: 1.6;
  text-align: left;
}

/* 屏幕 ≥ 768px */
@media (min-width: 768px) {
  .page-about .about-snapshot-grid {
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
  }

  .page-about .about-snapshot-num {
    font-size: 2rem;
  }

  .page-about .about-capability-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }
}

/* 屏幕 ≥ 900px */
@media (min-width: 900px) {
  .page-about .about-intro {
    padding: 44px 0 72px;
  }

  .page-about .about-intro-grid {
    grid-template-columns: 7fr 5fr;
    gap: 48px;
  }

  .page-about .about-trust-grid {
    grid-template-columns: 3fr 2fr;
    gap: 56px;
  }

  /* 时间线左右交错 */
  .page-about .about-timeline::before {
    left: 50%;
    transform: translateX(-50%);
  }

  .page-about .timeline-item {
    width: 50%;
    padding: 0 48px 0 0;
    margin-left: 0;
    text-align: right;
  }

  .page-about .timeline-item:nth-child(even) {
    margin-left: 50%;
    padding: 0 0 0 48px;
    text-align: left;
  }

  .page-about .timeline-item .timeline-marker {
    left: auto;
    right: -14px;
  }

  .page-about .timeline-item:nth-child(even) .timeline-marker {
    right: auto;
    left: -14px;
  }

  .page-about .timeline-content {
    border-left: none;
    border-right: 3px solid var(--neon);
  }

  .page-about .timeline-item:nth-child(even) .timeline-content {
    border-right: none;
    border-left: 3px solid var(--neon);
  }
}