.page-about {
  background: #F5F2ED;
  color: #1A1A1A;
  font-family: 'Noto Serif SC', serif;
  scroll-behavior: smooth;
  min-height: 60vh;
}

.page-about a:focus-visible {
  outline: 2px solid #FF6B2C;
  outline-offset: 2px;
}

/* 首屏英雄区 */
.page-about__hero {
  position: relative;
  overflow: hidden;
  background: linear-gradient(180deg, rgba(255, 255, 255, .04), rgba(255, 255, 255, 0)), #0A1E3F;
  color: #FFFFFF;
  padding: 2.5rem 0 3.25rem;
}
.page-about__hero::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, #D4AF37 0%, #FF6B2C 60%, #39FF14 100%);
  pointer-events: none;
}
.page-about__hero::after {
  content: "";
  position: absolute;
  left: -5%;
  bottom: 0;
  width: 44%;
  height: 3px;
  background: rgba(212, 175, 55, .45);
  transform: rotate(-4deg) translateY(-55%);
  transform-origin: left center;
  pointer-events: none;
}
.page-about__hero-grid {
  display: grid;
  gap: 2rem;
}
.page-about__hero-copy {
  min-width: 0;
}
.page-about__hero-kicker {
  margin: 0 0 .75rem;
  color: #D4AF37;
  font-family: 'Archivo Black', 'Noto Sans SC', sans-serif;
  font-size: .75rem;
  font-weight: 900;
  letter-spacing: .22em;
  text-transform: uppercase;
}
.page-about__hero-title {
  margin: 0 0 1rem;
  font-family: 'Archivo Black', 'Noto Sans SC', sans-serif;
  font-size: clamp(1.75rem, 5.5vw, 3rem);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: .01em;
}
.page-about__hero-lead {
  margin: 0 0 1.75rem;
  max-width: 34em;
  color: rgba(255, 255, 255, .84);
  font-size: 1rem;
  line-height: 1.8;
}
.page-about__hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: .625rem;
}
.page-about__stat {
  flex: 1 1 8.5rem;
  max-width: 11rem;
  padding: .75rem .875rem;
  background: rgba(7, 20, 40, .5);
  border-left: 3px solid #D4AF37;
  border-top: 1px solid rgba(212, 175, 55, .28);
}
.page-about__stat-num {
  display: block;
  margin-bottom: .25rem;
  color: #D4AF37;
  font-family: 'Archivo Black', 'Noto Sans SC', sans-serif;
  font-size: 1.5rem;
  font-weight: 900;
  line-height: 1;
}
.page-about__stat-label {
  display: block;
  color: rgba(255, 255, 255, .7);
  font-size: .8125rem;
  line-height: 1.4;
}
.page-about__hero-media {
  margin: 0;
  padding: .5rem;
  background: #071428;
  border: 1px solid rgba(212, 175, 55, .32);
}
.page-about__hero-media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* 页面布局 */
.page-about__layout {
  display: grid;
  gap: 2.5rem;
  padding: 2.75rem 0 4rem;
  align-items: start;
}

/* 侧边目录 */
.page-about__toc {
  position: relative;
  background: #FFFFFF;
  border: 1px solid #E0D8C8;
  border-top: 3px solid #D4AF37;
  padding: 1.25rem 1rem;
}
.page-about__toc-title {
  margin: 0 0 .75rem;
  color: #0A1E3F;
  font-family: 'Archivo Black', 'Noto Sans SC', sans-serif;
  font-size: .75rem;
  font-weight: 900;
  letter-spacing: .18em;
  text-transform: uppercase;
}
.page-about__toc-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: .375rem;
}
.page-about__toc-list a {
  display: inline-flex;
  align-items: center;
  gap: .375rem;
  padding: .375rem .625rem;
  color: #1A1A1A;
  border: 1px solid #E0D8C8;
  font-family: 'Noto Serif SC', serif;
  font-size: .875rem;
  text-decoration: none;
  transition: border-color .2s ease, color .2s ease, background-color .2s ease;
}
.page-about__toc-list a:hover,
.page-about__toc-list a:focus-visible {
  background: #F5F2ED;
  border-color: #D4AF37;
  color: #0A1E3F;
}
.page-about__toc-index {
  color: #D4AF37;
  font-family: 'Archivo Black', 'Noto Sans SC', sans-serif;
  font-size: .75rem;
  font-weight: 900;
}

/* 内容列 */
.page-about__content {
  min-width: 0;
}
.page-about__content a {
  color: #FF6B2C;
  text-decoration: underline;
  text-underline-offset: .15em;
  transition: color .2s ease;
}
.page-about__content a:hover,
.page-about__content a:focus-visible {
  color: #0A1E3F;
  text-decoration: none;
}

/* 章节通用 */
.page-about__section {
  scroll-margin-top: 6rem;
  border-bottom: 1px solid #E0D8C8;
  padding: 2.25rem 0;
}
.page-about__content .page-about__section:first-child {
  padding-top: 0;
}
.page-about__section-kicker {
  margin: 0 0 .5rem;
  color: #FF6B2C;
  font-family: 'Archivo Black', 'Noto Sans SC', sans-serif;
  font-size: .75rem;
  font-weight: 900;
  letter-spacing: .22em;
  text-transform: uppercase;
}
.page-about__section-title {
  margin: 0 0 1.5rem;
  color: #0A1E3F;
  font-family: 'Archivo Black', 'Noto Sans SC', sans-serif;
  font-size: 1.5rem;
  font-weight: 900;
  line-height: 1.25;
  max-width: 22em;
}

/* 我们是谁 */
.page-about__who-grid {
  display: grid;
  gap: 1.5rem;
}
.page-about__who-text {
  font-size: 1rem;
  line-height: 1.85;
}
.page-about__who-text p {
  margin: 0 0 1rem;
}
.page-about__who-points {
  margin: 0;
  padding: 0;
  list-style: none;
  background: #FFFFFF;
  border: 1px solid #E0D8C8;
}
.page-about__who-points li {
  padding: 1rem 1.25rem;
  border-bottom: 1px solid #E0D8C8;
  color: #333;
  font-size: .9375rem;
  line-height: 1.7;
}
.page-about__who-points li:last-child {
  border-bottom: 0;
}
.page-about__who-points strong {
  color: #0A1E3F;
  font-weight: 600;
}

/* 发展历程时间线 */
.page-about__timeline-wrap {
  display: grid;
  gap: 1.5rem;
}
.page-about__timeline {
  position: relative;
  padding-left: 1.75rem;
  border-left: 3px solid #D4AF37;
}
.page-about__tl-item {
  position: relative;
  padding: 0 0 1.75rem 1rem;
}
.page-about__tl-item::before {
  content: "";
  position: absolute;
  left: -1.75rem;
  top: .72rem;
  width: .625rem;
  height: .625rem;
  border: 2px solid #0A1E3F;
  border-radius: 50%;
  background: #D4AF37;
  transform: translateX(-50%);
}
.page-about__tl-year {
  display: block;
  margin-bottom: .5rem;
  color: #0A1E3F;
  font-family: 'Archivo Black', 'Noto Sans SC', sans-serif;
  font-size: 2rem;
  font-weight: 900;
  line-height: 1;
  transition: color .2s ease;
}
.page-about__tl-detail {
  border-left: 3px solid transparent;
  transition: background-color .2s ease, border-color .2s ease;
}
.page-about__tl-item:hover .page-about__tl-detail,
.page-about__tl-item:focus-within .page-about__tl-detail {
  border-left-color: #FF6B2C;
  background: rgba(212, 175, 55, .06);
}
.page-about__tl-detail h3 {
  margin: 0 0 .375rem;
  color: #0A1E3F;
  font-family: 'Archivo Black', 'Noto Sans SC', sans-serif;
  font-size: 1.125rem;
  font-weight: 900;
}
.page-about__tl-detail p {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.7;
  color: #333;
}
.page-about__timeline-media {
  margin: 0;
  padding: .5rem;
  background: #0A1E3F;
  border: 1px solid rgba(212, 175, 55, .3);
}
.page-about__timeline-media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about__timeline-note {
  margin: 1.5rem 0 0;
  font-size: .9375rem;
  line-height: 1.7;
}

/* 团队与文化 */
.page-about__team-grid {
  display: grid;
  gap: 1rem;
}
.page-about__team-card {
  position: relative;
  padding: 1.5rem;
  background: #FFFFFF;
  border: 1px solid #E0D8C8;
  border-left: 3px solid #D4AF37;
}
.page-about__team-index {
  position: absolute;
  top: 1.25rem;
  right: 1.25rem;
  color: #E0D8C8;
  font-family: 'Archivo Black', 'Noto Sans SC', sans-serif;
  font-size: 2rem;
  font-weight: 900;
  line-height: 1;
}
.page-about__team-card h3 {
  margin: 0 0 .5rem;
  color: #0A1E3F;
  font-family: 'Archivo Black', 'Noto Sans SC', sans-serif;
  font-size: 1.125rem;
  font-weight: 900;
}
.page-about__team-card p {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.7;
  color: #333;
}
.page-about__team-note {
  margin: 1.25rem 0 0;
  font-size: .9375rem;
  line-height: 1.75;
}

/* 资质与认证 */
.page-about__cert-grid {
  display: grid;
  gap: 1rem;
}
.page-about__cert-card {
  position: relative;
  padding: 1.75rem;
  overflow: hidden;
}
.page-about__cert-card--gold {
  background: #D4AF37;
  color: #1A1A1A;
}
.page-about__cert-card--gold::after {
  content: "";
  position: absolute;
  right: -1.25rem;
  bottom: -1.25rem;
  width: 5rem;
  height: 5rem;
  border-radius: 50%;
  background: rgba(10, 30, 63, .12);
}
.page-about__cert-card--dark {
  background: #071428;
  color: #FFFFFF;
}
.page-about__cert-card--dark::after {
  content: "";
  position: absolute;
  right: -1.25rem;
  top: -1.25rem;
  width: 5rem;
  height: 5rem;
  border-radius: 50%;
  background: rgba(212, 175, 55, .1);
}
.page-about__cert-year {
  display: block;
  margin-bottom: 1rem;
  font-family: 'Archivo Black', 'Noto Sans SC', sans-serif;
  font-size: 2.75rem;
  font-weight: 900;
  line-height: 1;
  color: #0A1E3F;
}
.page-about__cert-badge {
  display: inline-block;
  margin-bottom: 1rem;
  color: #39FF14;
  font-family: 'Archivo Black', 'Noto Sans SC', sans-serif;
  font-size: .875rem;
  font-weight: 900;
  letter-spacing: .06em;
  border: 1px solid #39FF14;
  padding: .25rem .5rem;
}
.page-about__cert-card h3 {
  margin: 0 0 .625rem;
  font-family: 'Archivo Black', 'Noto Sans SC', sans-serif;
  font-size: 1.25rem;
  font-weight: 900;
}
.page-about__cert-card--gold h3 {
  color: #0A1E3F;
}
.page-about__cert-card--dark h3 {
  color: #D4AF37;
}
.page-about__cert-card p {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.7;
}

/* K68版本技术亮点 */
.page-about__section--dark {
  position: relative;
  margin-top: 1rem;
  background: #071428;
  color: #FFFFFF;
  border-bottom: 0;
  padding: 2.5rem 1.5rem;
}
.page-about__section--dark::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 0;
  height: 0;
  border-top: 3.5rem solid #D4AF37;
  border-left: 3.5rem solid transparent;
  pointer-events: none;
}
.page-about__section--dark .page-about__section-title {
  color: #FFFFFF;
}
.page-about__section--dark .page-about__section-kicker {
  color: #39FF14;
}
.page-about__k68-grid {
  display: grid;
  gap: 1.75rem;
}
.page-about__k68-text p {
  margin: 0 0 1.25rem;
  color: rgba(255, 255, 255, .82);
  font-size: 1rem;
  line-height: 1.8;
}
.page-about__k68-list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid rgba(212, 175, 55, .25);
}
.page-about__k68-list li {
  position: relative;
  padding: .75rem 0 .75rem 1.5rem;
  border-bottom: 1px solid rgba(212, 175, 55, .2);
  color: rgba(255, 255, 255, .85);
  font-size: .9375rem;
  line-height: 1.65;
}
.page-about__k68-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 1.25rem;
  width: .625rem;
  height: 2px;
  background: #FF6B2C;
}
.page-about__k68-media {
  margin: 0;
  padding: .5rem;
  background: #0A1E3F;
  border: 1px solid rgba(212, 175, 55, .3);
}
.page-about__k68-media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* 底部行动引导 */
.page-about__cta {
  margin-top: 2.5rem;
  padding: 2rem;
  background: #FFFFFF;
  border: 1px solid #E0D8C8;
  border-bottom: 3px solid #D4AF37;
}
.page-about__cta-kicker {
  margin: 0 0 .5rem;
  color: #FF6B2C;
  font-family: 'Archivo Black', 'Noto Sans SC', sans-serif;
  font-size: .75rem;
  font-weight: 900;
  letter-spacing: .22em;
  text-transform: uppercase;
}
.page-about__cta-title {
  margin: 0 0 1rem;
  color: #0A1E3F;
  font-family: 'Archivo Black', 'Noto Sans SC', sans-serif;
  font-size: 1.375rem;
  font-weight: 900;
}
.page-about__cta p:last-child {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.8;
}

/* 桌面端增强 */
@media (min-width: 48em) {
  .page-about__hero-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 4fr);
    align-items: center;
    gap: 2.5rem;
  }
  .page-about__hero-title {
    font-size: clamp(2.25rem, 4vw, 3.25rem);
  }
  .page-about__hero-stats {
    gap: .875rem;
  }
  .page-about__stat {
    flex-basis: 9rem;
  }

  .page-about__layout {
    grid-template-columns: 14rem minmax(0, 1fr);
    gap: 3rem;
  }
  .page-about__toc {
    position: sticky;
    top: 2rem;
  }
  .page-about__toc-list {
    display: block;
    margin-top: 1rem;
  }
  .page-about__toc-list a {
    display: flex;
    width: 100%;
    padding: .625rem .375rem;
    border: 0;
    border-bottom: 1px solid #E0D8C8;
  }
  .page-about__toc-list a:hover,
  .page-about__toc-list a:focus-visible {
    background: transparent;
    color: #0A1E3F;
    border-color: #D4AF37;
  }

  .page-about__who-grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
    gap: 2rem;
  }

  .page-about__timeline-wrap {
    grid-template-columns: minmax(0, 1fr) 15rem;
    gap: 2rem;
    align-items: start;
  }
  .page-about__tl-year {
    font-size: 2.5rem;
  }

  .page-about__team-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about__cert-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about__k68-grid {
    grid-template-columns: minmax(0, 3fr) minmax(0, 2fr);
    gap: 2rem;
    align-items: center;
  }
}

@media (min-width: 64em) {
  .page-about__hero {
    padding: 4rem 0 4.25rem;
  }
  .page-about__hero-lead {
    font-size: 1.125rem;
  }
  .page-about__section {
    padding: 2.75rem 0;
  }
  .page-about__section-title {
    font-size: 1.75rem;
  }
  .page-about__team-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about__k68-grid {
    gap: 2.5rem;
  }
  .page-about__section--dark {
    padding: 3rem 2.5rem;
  }
}