.page-about {
  --about-gap: 28px;
  --about-frame-shadow: 6px 6px 0 var(--gray-dark);
  background: linear-gradient(180deg, var(--gray-light) 0%, var(--green-light) 140%);
  overflow-x: hidden;
}

/* 首屏品牌区 */
.page-about .about-hero {
  position: relative;
  padding: 18px 0 48px;
  background:
    radial-gradient(circle at 88% 12%, var(--red) 0 8px, transparent 9px),
    radial-gradient(circle at 8% 82%, var(--green) 0 6px, transparent 7px),
    linear-gradient(160deg, rgba(255, 255, 255, 0.55) 0%, rgba(46, 139, 87, 0.08) 100%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 6px;
  background: repeating-linear-gradient(90deg, var(--red) 0 28px, var(--green) 28px 56px);
}

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

.page-about .about-hero-copy {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.page-about .about-eyebrow {
  margin: 0 0 12px;
  font-family: var(--font-head);
  font-size: 0.85rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  color: var(--green-deep);
  border-left: 4px solid var(--red);
  padding-left: 10px;
}

.page-about .about-hero h1 {
  margin: 0 0 16px;
  font-family: var(--font-head);
  font-size: 2rem;
  font-weight: 900;
  line-height: 1.3;
  letter-spacing: 0.01em;
  color: var(--gray-dark);
}

.page-about .about-hero h1::after {
  content: "";
  display: block;
  width: 72px;
  height: 6px;
  margin-top: 14px;
  background: linear-gradient(90deg, var(--green) 0%, var(--red) 100%);
}

.page-about .about-lead {
  margin: 0 0 14px;
  font-size: 1.12rem;
  font-weight: 600;
  line-height: 1.75;
  color: var(--gray-dark);
}

.page-about .about-hero-text {
  margin: 0 0 8px;
  line-height: 1.8;
  color: var(--gray-mid);
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 22px;
}

/* 首屏图片 */
.page-about .about-hero-media {
  min-width: 0;
}

.page-about .about-image-shell {
  position: relative;
  border: var(--border-w) solid var(--gray-dark);
  box-shadow: var(--about-frame-shadow);
  background: var(--white);
  padding: 10px;
  transform: rotate(0.8deg);
}

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

.page-about .about-image-caption {
  display: inline-block;
  margin-top: 8px;
  padding: 5px 9px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  line-height: 1.4;
  color: var(--green-deep);
  background: var(--green-light);
  border-left: 3px solid var(--green);
}

/* 数据积累里程碑 */
.page-about .about-milestones {
  padding: 54px 0 64px;
  background: var(--white);
  border-top: 4px solid var(--green);
  border-bottom: 4px solid var(--red);
}

.page-about .about-section-head {
  max-width: 780px;
  margin-bottom: 28px;
}

.page-about .about-section-index {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--green);
  border-left: 4px solid var(--red);
  padding-left: 10px;
}

.page-about .about-milestones h2 {
  margin: 0 0 12px;
  font-size: 1.5rem;
  font-weight: 900;
  line-height: 1.35;
  color: var(--gray-dark);
}

.page-about .about-section-head p {
  margin: 0;
  line-height: 1.75;
  color: var(--gray-mid);
}

.page-about .about-milestone-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 36px;
  margin-top: 28px;
}

/* 时间轴 */
.page-about .about-timeline {
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 15px;
  top: 16px;
  bottom: 16px;
  width: 4px;
  border-radius: 4px;
  background: linear-gradient(180deg, var(--red) 0%, var(--red-orange) 50%, var(--red) 100%);
}

.page-about .about-timeline-item {
  position: relative;
  margin-bottom: 18px;
  border: var(--border-w) solid var(--gray-dark);
  background: var(--white);
  box-shadow: 4px 4px 0 rgba(51, 51, 51, 0.14);
  transition: box-shadow 0.25s ease, transform 0.25s ease;
}

.page-about .about-timeline-item[open] {
  box-shadow: 6px 6px 0 var(--green);
  transform: translateY(-2px);
}

.page-about .about-dot {
  position: absolute;
  left: 10px;
  top: 22px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--green);
  border: 3px solid var(--gray-dark);
  z-index: 1;
}

.page-about .about-timeline-summary {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  padding: 16px 18px 16px 52px;
  cursor: pointer;
  list-style: none;
}

.page-about .about-timeline-summary::-webkit-details-marker {
  display: none;
}

.page-about .about-timeline-tag {
  flex-shrink: 0;
  padding: 5px 9px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--green-deep);
  background: var(--green-light);
  border: 2px solid var(--green);
}

.page-about .about-timeline-title {
  flex: 1 1 200px;
  font-family: var(--font-head);
  font-size: 1.05rem;
  font-weight: 800;
  line-height: 1.4;
  color: var(--gray-dark);
}

.page-about .about-timeline-desc {
  margin: 0;
  padding: 4px 18px 18px 52px;
  border-top: 1px dashed var(--green-light);
  font-size: 0.95rem;
  line-height: 1.75;
  color: var(--gray-mid);
}

/* 右侧数据墙 */
.page-about .about-milestone-right {
  display: flex;
  flex-direction: column;
  gap: 20px;
  min-width: 0;
}

.page-about .about-data-wall {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.page-about .about-data-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 16px 14px 14px;
  border: var(--border-w) solid var(--gray-dark);
  background: var(--white);
  box-shadow: var(--shadow);
  transition: transform 0.2s ease;
}

.page-about .about-data-card:hover {
  transform: translateY(-4px);
}

.page-about .about-data-card--red {
  background: var(--red);
}

.page-about .about-data-card--red .about-data-label {
  color: var(--white);
}

.page-about .about-data-num {
  font-family: var(--font-mono);
  font-size: 2.5rem;
  font-weight: 800;
  line-height: 1;
  color: var(--green-deep);
  white-space: nowrap;
}

.page-about .about-data-card--red .about-data-num {
  color: var(--white);
}

.page-about .about-data-plus {
  font-size: 1.5rem;
  vertical-align: middle;
}

.page-about .about-data-unit {
  margin-left: 2px;
  font-size: 1rem;
}

.page-about .about-data-label {
  font-family: var(--font-head);
  font-size: 0.86rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--gray-mid);
}

.page-about .about-milestone-media {
  border: var(--border-w) solid var(--gray-dark);
  box-shadow: var(--about-frame-shadow);
  background: var(--gray-light);
}

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

/* 团队与服务理念 */
.page-about .about-team {
  padding: 58px 0 62px;
  background: linear-gradient(135deg, var(--green) 0%, var(--green-deep) 100%);
  border-top: 6px solid var(--red);
}

.page-about .about-team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 32px;
  align-items: center;
}

.page-about .about-team .about-section-index {
  color: var(--green-light);
}

.page-about .about-team h2 {
  margin: 0 0 14px;
  font-size: 1.5rem;
  font-weight: 900;
  line-height: 1.35;
  color: var(--white);
}

.page-about .about-team-text {
  margin: 0 0 14px;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.92);
}

.page-about .about-team-values {
  list-style: none;
  margin: 18px 0 20px;
  padding: 0;
}

.page-about .about-team-values li {
  margin-bottom: 10px;
  padding: 12px 16px;
  border-left: 5px solid var(--red);
  background: rgba(255, 255, 255, 0.1);
  line-height: 1.7;
  color: var(--white);
}

.page-about .about-team-values strong {
  color: var(--green-light);
}

.page-about .about-team-media {
  border: var(--border-w) solid var(--gray-dark);
  box-shadow: 6px 6px 0 rgba(0, 0, 0, 0.2);
  background: var(--white);
  transform: rotate(-0.6deg);
}

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

/* 发展愿景 */
.page-about .about-vision {
  padding: 58px 0 66px;
  background: var(--gray-dark);
  color: var(--white);
}

.page-about .about-vision .about-section-index {
  color: var(--red-orange);
}

.page-about .about-vision h2 {
  margin: 0 0 12px;
  font-size: 1.5rem;
  font-weight: 900;
  line-height: 1.35;
  color: var(--white);
}

.page-about .about-vision-steps {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
  margin-top: 30px;
}

.page-about .about-vision-step {
  position: relative;
  border: var(--border-w) solid var(--gray-dark);
  background: var(--white);
  padding: 22px 20px 22px 24px;
  box-shadow: 6px 6px 0 var(--red);
}

.page-about .about-step-num {
  display: block;
  margin-bottom: 12px;
  font-family: var(--font-mono);
  font-size: 1.8rem;
  font-weight: 800;
  line-height: 1;
  color: var(--red);
}

.page-about .about-vision-step h3 {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-size: 1.12rem;
  font-weight: 800;
  color: var(--gray-dark);
}

.page-about .about-vision-step p {
  margin: 0;
  line-height: 1.75;
  color: var(--gray-mid);
}

.page-about .about-vision-note {
  margin: 34px 0 0;
  padding: 16px 20px;
  border-left: 6px solid var(--red);
  background: rgba(255, 255, 255, 0.08);
  font-weight: 700;
  line-height: 1.7;
  color: var(--white);
}

/* 平板及以上 */
@media (min-width: 768px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
    gap: 40px;
    align-items: center;
  }

  .page-about .about-milestone-grid {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .about-data-wall {
    grid-template-columns: 1fr 1fr;
    gap: 16px;
  }

  .page-about .about-team-grid {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
    gap: 44px;
  }

  .page-about .about-vision-steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 24px;
  }

  .page-about .about-vision-step {
    padding: 26px 20px 24px 26px;
  }
}

/* 大屏桌面 */
@media (min-width: 1024px) {
  .page-about .about-hero {
    padding: 46px 0 68px;
  }

  .page-about .about-hero h1 {
    font-size: 2.9rem;
  }

  .page-about .about-milestones {
    padding: 64px 0 76px;
  }

  .page-about .about-milestones h2,
  .page-about .about-team h2,
  .page-about .about-vision h2 {
    font-size: 1.9rem;
  }

  .page-about .about-team {
    padding: 68px 0 72px;
  }

  .page-about .about-vision {
    padding: 68px 0 78px;
  }
}