.page-about {
  --about-clip: polygon(0 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%);
  --about-line: rgba(30, 78, 140, 0.15);
  background: var(--color-bg);
}

.page-about .section {
  padding: var(--space-section) 0;
}

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

.page-about .media-frame--clip {
  position: relative;
  border-radius: 0;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 24px), calc(100% - 24px) 100%, 0 100%);
}

.page-about .media-frame--tilt {
  position: relative;
  border-radius: 0;
  transform: rotate(-1deg) translateY(4px);
  border: 4px solid var(--color-cream);
  box-shadow: 8px 10px 0 rgba(30, 78, 140, 0.08);
}

.page-about .section-kicker {
  color: var(--color-orange);
  font-weight: 700;
  letter-spacing: 0.06em;
}

.page-about .section-title {
  color: var(--color-ink);
  margin-bottom: 0.5rem;
}

.page-about .section-desc {
  color: var(--color-gray);
  line-height: 1.7;
  max-width: 32em;
}

.page-about .section-head--split {
  display: grid;
  gap: 1rem;
  margin-bottom: 2rem;
}

/* 页头区：档案封面 */
.page-about .about-hero {
  padding: 1.5rem 0 3rem;
  background: var(--color-cream);
  overflow: hidden;
}

.page-about .about-hero__grid {
  display: grid;
  gap: 2rem;
  align-items: center;
}

.page-about .about-hero__head {
  padding-top: 0.5rem;
}

.page-about .about-hero__title {
  font-size: clamp(2rem, 6vw, 3.5rem);
  line-height: 1.1;
  margin: 0.5rem 0 1rem;
  letter-spacing: -0.02em;
  color: var(--color-ink);
}

.page-about .about-hero__lead {
  font-size: clamp(1rem, 2vw, 1.125rem);
  line-height: 1.7;
  color: var(--color-gray);
  max-width: 34em;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

.page-about .about-hero__stats {
  background: var(--color-primary);
  color: #fff;
  padding: 1.5rem 1.5rem 2.25rem;
  display: grid;
  gap: 1rem;
  clip-path: var(--about-clip);
  position: relative;
}

.page-about .about-hero__stats::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--color-orange) 0 33%, var(--color-red) 33% 66%, var(--color-green) 66% 100%);
}

.page-about .about-stat {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.5rem;
  padding: 0.75rem 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.2);
}

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

.page-about .about-stat__num {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: #fff;
}

.page-about .about-stat__unit {
  font-size: 0.75em;
  font-weight: 400;
  margin-left: 0.25rem;
  opacity: 0.9;
}

.page-about .about-stat__label {
  font-size: 0.9rem;
  opacity: 0.85;
  text-align: right;
}

/* 品牌故事 */
.page-about .about-story__grid {
  display: grid;
  gap: 2.5rem;
  align-items: center;
}

.page-about .about-story__media {
  position: relative;
}

.page-about .about-story__media .media-frame {
  background: var(--color-gray);
}

.page-about .about-story__badge {
  position: absolute;
  right: 0.75rem;
  bottom: 0.75rem;
  background: var(--color-orange);
  color: #fff;
  padding: 0.75rem 1rem;
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  font-weight: 600;
  transform: rotate(-2deg);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%);
}

.page-about .about-story__badge-year {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 700;
}

.page-about .about-story__badge-text {
  font-size: 0.85rem;
}

.page-about .about-story__text {
  color: var(--color-gray);
  line-height: 1.7;
  margin: 0 0 1rem;
}

.page-about .about-story__list {
  list-style: none;
  margin: 1.5rem 0 0;
  padding: 1.5rem 0 0;
  border-top: 1px solid var(--about-line);
}

.page-about .about-story__list li {
  position: relative;
  padding: 0.85rem 0 0.85rem 2.25rem;
  border-bottom: 1px solid var(--about-line);
  font-weight: 600;
  color: var(--color-ink);
}

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

.page-about .about-story__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 1.35rem;
  width: 1.25rem;
  height: 2px;
  background: var(--color-red);
  transform: rotate(-45deg);
  transform-origin: left center;
}

/* 发展里程碑 */
.page-about .about-milestones {
  background: linear-gradient(180deg, var(--color-primary) 0%, #173e6e 100%);
  color: #fff;
}

.page-about .about-milestones .section-title,
.page-about .about-milestones .section-desc {
  color: rgba(255, 255, 255, 0.85);
}

.page-about .about-milestones .section-kicker {
  color: var(--color-orange);
}

.page-about .milestone-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1.5rem;
}

.page-about .filter-button {
  border: 1px solid rgba(255, 255, 255, 0.45);
  background: transparent;
  color: #fff;
  padding: 0.5rem 1rem;
  font-family: var(--font-body);
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
}

.page-about .filter-button:hover {
  border-color: #fff;
}

.page-about .filter-button.is-active {
  background: #fff;
  color: var(--color-primary);
  border-color: #fff;
}

.page-about .milestone-list {
  list-style: none;
  margin: 2rem 0 0;
  padding: 0;
  display: grid;
  gap: 1.25rem;
}

.page-about .milestone-item {
  display: grid;
  grid-template-columns: 4.5rem 1fr;
  gap: 1rem;
  align-items: stretch;
}

.page-about .milestone-item.is-hidden {
  display: none;
}

.page-about .milestone-item__marker {
  width: 4.5rem;
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
}

.page-about .milestone-item__node {
  width: 14px;
  height: 14px;
  background: #fff;
  border: 3px solid var(--color-orange);
  transform: rotate(45deg);
  box-shadow: 0 0 0 2px var(--color-orange);
}

.page-about .milestone-item__marker::after {
  content: "";
  width: 2px;
  flex: 1;
  min-height: 1.5rem;
  background: rgba(255, 255, 255, 0.35);
}

.page-about .milestone-item:last-child .milestone-item__marker::after {
  display: none;
}

.page-about .milestone-item__year {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.1rem;
  color: #fff;
}

.page-about .milestone-card {
  background: var(--color-cream);
  color: var(--color-ink);
  padding: 1.25rem;
  position: relative;
}

.page-about .milestone-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: var(--color-orange);
}

.page-about .milestone-card .tag {
  margin-bottom: 0.5rem;
}

.page-about .milestone-card__title {
  font-size: 1.2rem;
  margin: 0.5rem 0;
  color: var(--color-primary);
}

.page-about .milestone-card__text {
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--color-gray);
  margin: 0;
}

/* 团队与能力 */
.page-about .about-team__grid {
  display: grid;
  gap: 2.5rem;
  align-items: start;
}

.page-about .about-team__content {
  order: 1;
}

.page-about .about-team__media {
  order: 2;
}

.page-about .about-team__text {
  color: var(--color-gray);
  line-height: 1.7;
  margin: 0 0 1.5rem;
}

.page-about .about-team__skills {
  display: grid;
  gap: 0.75rem;
}

.page-about .skill-card {
  position: relative;
  background: var(--color-cream);
  padding: 1rem 1.25rem 1rem 3.5rem;
  border-left: 4px solid var(--color-primary);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.page-about .skill-card:hover {
  transform: translateX(6px);
  box-shadow: 6px 8px 0 rgba(30, 78, 140, 0.08);
}

.page-about .skill-card__index {
  position: absolute;
  left: 0.9rem;
  top: 1rem;
  font-family: var(--font-mono);
  color: var(--color-red);
  font-weight: 700;
}

.page-about .skill-card__title {
  font-size: 1.05rem;
  margin: 0 0 0.35rem;
  color: var(--color-primary);
}

.page-about .skill-card__text {
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--color-gray);
  margin: 0;
}

.page-about .about-team__numcard {
  margin-top: 1.5rem;
  background: var(--color-primary);
  color: #fff;
  padding: 1.25rem;
  text-align: center;
  position: relative;
  border-bottom: 4px solid var(--color-red);
}

.page-about .about-team__num {
  font-size: 2.75rem;
  font-weight: 700;
  display: block;
  color: #fff;
}

.page-about .about-team__unit {
  font-size: 0.75em;
  margin-left: 0.25rem;
}

.page-about .about-team__numlabel {
  font-size: 0.9rem;
  opacity: 0.85;
  display: block;
  margin-top: 0.25rem;
}

/* 资质与认证 */
.page-about .about-cert {
  background: var(--color-cream);
}

.page-about .about-cert__grid {
  display: grid;
  gap: 2rem;
  align-items: stretch;
}

.page-about .about-cert__cards {
  display: grid;
  gap: 1rem;
}

.page-about .cert-card {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  background: #fff;
  padding: 1.25rem;
  border: 1px solid rgba(108, 117, 125, 0.12);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.page-about .cert-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 0 rgba(30, 78, 140, 0.06);
}

.page-about .cert-card--green {
  border-left: 4px solid var(--color-green);
}

.page-about .cert-card--blue {
  border-left: 4px solid var(--color-primary);
}

.page-about .cert-card--orange {
  border-left: 4px solid var(--color-orange);
}

.page-about .cert-card__icon {
  flex-shrink: 0;
  width: 3rem;
  height: 3rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(30, 78, 140, 0.08);
}

.page-about .cert-card__title {
  font-size: 1.05rem;
  margin: 0 0 0.35rem;
  color: var(--color-ink);
}

.page-about .cert-card__text {
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--color-gray);
  margin: 0;
}

/* 合作伙伴 */
.page-about .about-partners__grid {
  display: grid;
  gap: 1rem;
}

.page-about .partner-card {
  background: var(--color-bg);
  border: 1px solid rgba(108, 117, 125, 0.15);
  padding: 1.5rem;
  position: relative;
  padding-top: 2rem;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.page-about .partner-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-orange));
}

.page-about .partner-card:hover {
  box-shadow: 8px 8px 0 rgba(30, 78, 140, 0.1);
  transform: translate(-4px, -4px);
}

.page-about .partner-card__type {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-red);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.page-about .partner-card__title {
  font-size: 1.2rem;
  margin: 0.25rem 0 0.5rem;
  color: var(--color-primary);
}

.page-about .partner-card__text {
  color: var(--color-gray);
  font-size: 0.95rem;
  line-height: 1.7;
  margin: 0;
}

/* 内部 CTA */
.page-about .about-cta__grid {
  display: grid;
  gap: 1rem;
}

.page-about .cta-link {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1.25rem;
  background: var(--color-cream);
  border: 1px solid rgba(108, 117, 125, 0.12);
  border-left: 5px solid var(--color-primary);
  text-decoration: none;
  color: var(--color-ink);
  transition: all 0.2s ease;
}

.page-about .cta-link:hover {
  border-left-color: var(--color-orange);
  background: #fdf6ec;
  transform: translateX(6px);
}

.page-about .cta-link__num {
  font-family: var(--font-mono);
  color: var(--color-primary);
  font-weight: 700;
}

.page-about .cta-link__title {
  flex: 1;
  font-weight: 700;
}

.page-about .cta-link__arrow {
  color: var(--color-orange);
  font-size: 1.5rem;
}

/* 桌面端布局 */
@media (min-width: 700px) {
  .page-about .section-head--split {
    grid-template-columns: 1fr 1fr;
    align-items: end;
  }

  .page-about .about-story__grid {
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
  }

  .page-about .about-story__content {
    padding-top: 0;
  }

  .page-about .about-team__skills {
    grid-template-columns: 1fr 1fr;
  }

  .page-about .about-cert__grid {
    grid-template-columns: 0.9fr 1.1fr;
    align-items: center;
  }

  .page-about .about-partners__grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 1.25rem;
  }

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

@media (min-width: 900px) {
  .page-about .about-hero {
    background:
      linear-gradient(120deg, var(--color-cream) 0%, var(--color-bg) 62%, rgba(30, 78, 140, 0.1) 62%);
  }

  .page-about .about-hero__grid {
    grid-template-columns: 1.2fr 0.8fr;
    gap: 3rem;
  }

  .page-about .about-hero__stats {
    margin-left: 1.5rem;
    padding: 2rem 2rem 3rem;
  }

  .page-about .about-team__grid {
    grid-template-columns: 1fr 0.9fr;
    gap: 3.5rem;
  }
}