.page-about {
  --about-timeline-pad: 2rem;
  --about-timeline-dot-left: -2.325rem;
  position: relative;
  background-color: var(--bg-deep);
  color: var(--text-light);
  font-family: var(--font-body);
  line-height: 1.7;
}

.page-about a {
  color: var(--accent-green);
  text-decoration: none;
  border-bottom: 1px solid rgba(57, 255, 20, 0.35);
  transition: color var(--transition-fast), border-color var(--transition-fast);
}
.page-about a:hover,
.page-about a:focus-visible {
  color: var(--text-light);
  border-bottom-color: var(--accent-green);
  outline: none;
}

/* 面包屑 */
.page-about .about-crumb {
  padding: 1rem 1.25rem 0;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.page-about .about-crumb a {
  color: var(--text-secondary);
  border-bottom: none;
}
.page-about .about-crumb a:hover {
  color: var(--accent-green);
}
.page-about .about-crumb__current {
  color: var(--accent-green);
}
.page-about .about-crumb__sep {
  color: var(--border-line);
}

/* 首屏框景 */
.page-about .about-hero {
  position: relative;
  padding: 1.5rem 1.25rem 3rem;
  background-image:
    linear-gradient(rgba(35, 53, 84, 0.16) 1px, transparent 1px),
    linear-gradient(90deg, rgba(35, 53, 84, 0.16) 1px, transparent 1px);
  background-size: 2rem 2rem;
  border-bottom: 1px solid var(--border-line);
}
.page-about .about-hero__window {
  position: relative;
  border: 1px solid var(--border-line);
  background: linear-gradient(155deg, rgba(17, 34, 64, 0.92), rgba(10, 25, 47, 0.96));
  padding: 2rem 1.25rem;
  box-shadow: var(--shadow-float);
  overflow: hidden;
}
.page-about .about-hero__window::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 0.375rem;
  background: repeating-linear-gradient(90deg, var(--accent-green) 0 2px, transparent 2px 10px);
  opacity: 0.28;
  pointer-events: none;
}
.page-about .about-hero__corner {
  position: absolute;
  width: 1.1rem;
  height: 1.1rem;
  border-color: var(--accent-green);
  border-style: solid;
  z-index: 2;
}
.page-about .about-hero__corner--tl { top: 0; left: 0; border-width: 2px 0 0 2px; }
.page-about .about-hero__corner--tr { top: 0; right: 0; border-width: 2px 2px 0 0; }
.page-about .about-hero__corner--bl { bottom: 0; left: 0; border-width: 0 0 2px 2px; }
.page-about .about-hero__corner--br { bottom: 0; right: 0; border-width: 0 2px 2px 0; }
.page-about .about-hero__watermark {
  position: absolute;
  right: -1rem;
  bottom: 0.5rem;
  font-family: var(--font-display);
  font-size: 7rem;
  line-height: 1;
  letter-spacing: -0.04em;
  color: rgba(57, 255, 20, 0.05);
  user-select: none;
  pointer-events: none;
}
.page-about .about-hero h1 {
  position: relative;
  z-index: 1;
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 5vw, 3.25rem);
  line-height: 1.18;
  letter-spacing: 0.01em;
  margin: 0.75rem 0 1rem;
  max-width: 15em;
}
.page-about .about-hero__lead {
  position: relative;
  z-index: 1;
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.85;
  max-width: 40rem;
  margin: 0 0 1.75rem;
}
.page-about .about-hero__stats {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--border-line);
  border: 1px solid var(--border-line);
}
.page-about .about-hero__stat {
  background: rgba(15, 42, 67, 0.92);
  padding: 0.9rem 1rem;
}
.page-about .about-hero__stat-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.6rem;
  font-weight: 700;
  line-height: 1.1;
  color: var(--accent-green);
}
.page-about .about-hero__stat-label {
  display: block;
  margin-top: 0.35rem;
  font-size: 0.72rem;
  line-height: 1.4;
  color: var(--text-secondary);
}
.page-about .about-hero__scroll {
  display: inline-block;
  margin-top: 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-secondary);
  border-bottom-color: transparent;
}
.page-about .about-hero__scroll:hover {
  color: var(--accent-green);
}

/* 品牌起点 */
.page-about .about-origin {
  padding: 2.5rem 1.25rem;
  display: grid;
  gap: 1.75rem;
  border-bottom: 1px solid var(--border-line);
}
.page-about #origin {
  scroll-margin-top: calc(var(--header-h) + 1rem);
}
.page-about .about-origin__media {
  position: relative;
  background: var(--bg-mid);
  border: 1px solid var(--border-line);
  padding: 0.75rem;
}
.page-about .about-origin__media::after {
  content: "";
  position: absolute;
  inset: 0.5rem;
  border: 1px solid rgba(57, 255, 20, 0.28);
  pointer-events: none;
}
.page-about .about-origin__media img {
  width: 100%;
  height: auto;
  display: block;
  filter: saturate(0.85) contrast(1.06);
}
.page-about .about-origin__caption {
  display: inline-block;
  margin-top: 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  line-height: 1.5;
  color: var(--text-secondary);
  border-left: 2px solid var(--accent-green);
  padding-left: 0.6rem;
}
.page-about .about-origin__body {
  position: relative;
}
.page-about .about-origin__body p {
  font-size: 0.88rem;
  line-height: 1.85;
  color: var(--text-secondary);
  margin: 0 0 0.9rem;
}
.page-about .about-origin__body h2,
.page-about .about-milestones__head h2,
.page-about .about-data__head h2,
.page-about .about-mission > h2 {
  font-family: var(--font-display);
  font-size: 1.45rem;
  line-height: 1.3;
  letter-spacing: 0.01em;
  margin: 0.5rem 0 0.75rem;
}

/* 发展里程碑 */
.page-about .about-milestones {
  padding: 2.5rem 1.25rem;
  background: linear-gradient(180deg, rgba(15, 42, 67, 0.4), rgba(10, 25, 47, 0.9));
  border-bottom: 1px solid var(--border-line);
}
.page-about .about-milestones__head {
  margin-bottom: 1.5rem;
}
.page-about .about-milestones__intro {
  color: var(--text-secondary);
  font-size: 0.88rem;
  line-height: 1.8;
  margin: 0.75rem 0 0;
  max-width: 42rem;
}
.page-about .about-milestones__layout {
  display: grid;
  gap: 1.5rem;
}
.page-about .about-milestones__rail {
  display: flex;
  flex-wrap: nowrap;
  gap: 0.5rem;
  overflow-x: auto;
  padding: 0.75rem;
  background: rgba(15, 42, 67, 0.7);
  border: 1px solid var(--border-line);
  border-left: 2px solid var(--accent-orange);
  scrollbar-width: thin;
  scrollbar-color: var(--border-line) transparent;
  -webkit-overflow-scrolling: touch;
}
.page-about .about-milestones__rail-title {
  flex: none;
  display: inline-flex;
  align-items: center;
  margin-right: 0.25rem;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-secondary);
}
.page-about .about-milestones__rail-link {
  flex: none;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-secondary);
  border: 1px solid var(--border-line);
  background: var(--bg-deep);
  padding: 0.35rem 0.7rem;
}
.page-about .about-milestones__rail-link:hover,
.page-about .about-milestones__rail-link:focus-visible {
  color: var(--accent-green);
  border-color: var(--accent-green);
}

/* 时间线列表 */
.page-about .about-timeline__list {
  position: relative;
  padding-left: var(--about-timeline-pad);
}
.page-about .about-timeline__list::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.5rem;
  bottom: 0.5rem;
  width: 1px;
  background: linear-gradient(180deg, var(--accent-green), var(--border-line) 40%, var(--border-line));
}
.page-about .about-timeline__item {
  position: relative;
  display: grid;
  gap: 0.6rem;
  padding-bottom: 2rem;
  scroll-margin-top: calc(var(--header-h) + 1.5rem);
}
.page-about .about-timeline__item:last-child {
  padding-bottom: 0;
}
.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: var(--about-timeline-dot-left);
  top: 0.55rem;
  width: 0.65rem;
  height: 0.65rem;
  background: var(--bg-deep);
  border: 2px solid var(--accent-green);
  transform: rotate(45deg);
  z-index: 1;
}
.page-about .about-timeline__year {
  font-family: var(--font-mono);
  font-size: 1.7rem;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--accent-green);
}
.page-about .about-timeline__card {
  position: relative;
  background: var(--bg-surface);
  border: 1px solid var(--border-line);
  padding: 1.1rem 1.25rem 1.25rem;
}
.page-about .about-timeline__card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 2px;
  height: 100%;
  background: linear-gradient(180deg, var(--accent-green), var(--data-cyan));
}
.page-about .about-timeline__item:target .about-timeline__card {
  border-color: var(--accent-green);
  box-shadow: 0 0 0 1px rgba(57, 255, 20, 0.25);
}
.page-about .about-timeline__phase {
  display: inline-block;
  margin-bottom: 0.6rem;
  padding: 0.2rem 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  color: var(--text-secondary);
  background: var(--bg-deep);
  border: 1px solid var(--border-line);
}
.page-about .about-timeline__card h3 {
  margin: 0 0 0.5rem;
  font-family: var(--font-body);
  font-size: 1.02rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--text-light);
}
.page-about .about-timeline__card p {
  margin: 0;
  font-size: 0.84rem;
  line-height: 1.8;
  color: var(--text-secondary);
}
.page-about .about-milestones__media {
  margin: 2.5rem 0 0;
  position: relative;
  background: var(--bg-mid);
  border: 1px solid var(--border-line);
}
.page-about .about-milestones__media img {
  width: 100%;
  height: auto;
  display: block;
  filter: saturate(0.72) contrast(1.1);
}
.page-about .about-milestones__media figcaption {
  position: absolute;
  left: 0.75rem;
  bottom: 0.75rem;
  max-width: 22rem;
  padding: 0.45rem 0.65rem;
  background: rgba(10, 25, 47, 0.88);
  border-left: 2px solid var(--accent-green);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  line-height: 1.5;
  color: var(--text-light);
}

/* 数据资产管理 */
.page-about .about-data {
  padding: 2.5rem 1.25rem;
  background-image:
    linear-gradient(rgba(35, 53, 84, 0.12) 1px, transparent 1px),
    linear-gradient(90deg, rgba(35, 53, 84, 0.12) 1px, transparent 1px);
  background-size: 1.5rem 1.5rem;
  background-color: var(--bg-deep);
  border-bottom: 1px solid var(--border-line);
}
.page-about .about-data__head {
  margin-bottom: 1.5rem;
}
.page-about .about-data__intro {
  color: var(--text-secondary);
  font-size: 0.88rem;
  line-height: 1.8;
  margin: 0.75rem 0 0;
  max-width: 44rem;
}
.page-about .about-data__layout {
  display: grid;
  gap: 1.5rem;
}
.page-about .about-data__chart {
  margin: 0;
  background: var(--bg-mid);
  border: 1px solid var(--border-line);
  padding: 0.5rem;
}
.page-about .about-data__chart img {
  width: 100%;
  height: auto;
  display: block;
}
.page-about .about-data__chart figcaption {
  padding: 0.5rem 0.25rem 0.25rem;
  border-bottom: 1px solid var(--border-line);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  line-height: 1.5;
  color: var(--text-secondary);
}
.page-about .about-data__table {
  width: 100%;
  margin-bottom: 1rem;
  border-collapse: collapse;
  font-size: 0.82rem;
  background: rgba(17, 34, 64, 0.65);
}
.page-about .about-data__table caption {
  text-align: left;
  margin-bottom: 0.4rem;
}
.page-about .about-data__table th,
.page-about .about-data__table td {
  padding: 0.65rem 0.75rem;
  border: 1px solid var(--border-line);
  text-align: left;
  vertical-align: top;
  line-height: 1.6;
}
.page-about .about-data__table thead th {
  background: var(--bg-deep);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 400;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent-green);
}
.page-about .about-data__table tbody th {
  background: rgba(15, 42, 67, 0.6);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 400;
  white-space: nowrap;
  color: var(--data-cyan);
}
.page-about .about-data__table td {
  color: var(--text-secondary);
}
.page-about .about-data__note {
  margin: 0;
  padding: 0.75rem 0.9rem;
  background: rgba(15, 42, 67, 0.45);
  border-left: 2px solid var(--accent-orange);
  font-size: 0.85rem;
  line-height: 1.85;
  color: var(--text-secondary);
}
.page-about .about-data__stats {
  margin-top: 1.75rem;
}

/* 团队与使命 */
.page-about .about-mission {
  padding: 2.5rem 1.25rem;
}
.page-about .about-mission > h2 {
  margin-bottom: 0.75rem;
}
.page-about .about-mission__intro {
  margin: 0 0 1.5rem;
  max-width: 44rem;
  font-size: 0.88rem;
  line-height: 1.85;
  color: var(--text-secondary);
}
.page-about .about-mission__grid {
  display: grid;
  gap: 1rem;
}
.page-about .about-mission__card {
  position: relative;
  padding: 1.1rem 1.2rem 1.25rem;
  background: var(--bg-surface);
  border: 1px solid var(--border-line);
  border-top: 3px solid var(--accent-green);
}
.page-about .about-mission__num {
  display: block;
  font-family: var(--font-display);
  font-size: 2.25rem;
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--accent-green);
}
.page-about .about-mission__card h3 {
  margin: 0.55rem 0 0.5rem;
  font-size: 1rem;
  color: var(--text-light);
}
.page-about .about-mission__card p {
  margin: 0;
  font-size: 0.84rem;
  line-height: 1.8;
  color: var(--text-secondary);
}
.page-about .about-mission__values {
  margin-top: 1.75rem;
  padding: 1.25rem 1.25rem 1.35rem;
  background: rgba(15, 42, 67, 0.55);
  border: 1px solid var(--border-line);
  border-left: 3px solid var(--accent-orange);
}
.page-about .about-mission__values h3 {
  margin: 0 0 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-light);
}
.page-about .about-mission__values ol {
  display: grid;
  gap: 0.6rem;
  margin: 0;
  padding-left: 1.25rem;
}
.page-about .about-mission__values li {
  font-size: 0.85rem;
  line-height: 1.75;
  color: var(--text-secondary);
}
.page-about .about-mission__values li::marker {
  font-family: var(--font-mono);
  color: var(--accent-orange);
}
.page-about .about-mission__note {
  margin-top: 1.5rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--border-line);
  font-size: 0.85rem;
  line-height: 1.85;
  color: var(--text-secondary);
}

@media (min-width: 64rem) {
  .page-about {
    --about-timeline-pad: 2.5rem;
    --about-timeline-dot-left: -2.825rem;
  }

  .page-about .about-crumb {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 1.5rem 2rem 0;
    font-size: 0.8rem;
  }

  .page-about .about-hero {
    padding: 3rem 2rem 4.5rem;
  }
  .page-about .about-hero__window {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 3.25rem 3.5rem 3rem;
  }
  .page-about .about-hero h1 {
    font-size: clamp(2.5rem, 4vw, 3.5rem);
    max-width: 14em;
  }
  .page-about .about-hero__lead {
    font-size: 1.05rem;
    max-width: 44rem;
  }
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, 1fr);
  }
  .page-about .about-hero__stat {
    padding: 1.1rem 1.25rem;
  }
  .page-about .about-hero__stat-num {
    font-size: 2rem;
  }
  .page-about .about-hero__watermark {
    font-size: 10rem;
    right: 1rem;
    bottom: 0.75rem;
  }
  .page-about .about-hero__scroll {
    display: block;
    max-width: var(--container-width);
    margin: 1.25rem auto 0;
  }

  .page-about .about-origin {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 5rem 2rem;
    grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
    gap: 4rem;
    align-items: center;
  }
  .page-about .about-origin__media {
    padding: 1rem;
    transform: translateY(-1.25rem);
  }
  .page-about .about-origin__body {
    padding-top: 0.5rem;
  }
  .page-about .about-origin__body p {
    font-size: 0.95rem;
  }
  .page-about .about-origin__body h2,
  .page-about .about-milestones__head h2,
  .page-about .about-data__head h2,
  .page-about .about-mission > h2 {
    font-size: 2rem;
    line-height: 1.25;
  }

  .page-about .about-milestones {
    padding: 5rem 2rem;
  }
  .page-about .about-milestones__head {
    max-width: var(--container-width);
    margin: 0 auto 2.5rem;
  }
  .page-about .about-milestones__intro {
    font-size: 0.95rem;
  }
  .page-about .about-milestones__layout {
    max-width: var(--container-width);
    margin: 0 auto;
    grid-template-columns: 11rem minmax(0, 1fr);
    gap: 3rem;
    align-items: start;
  }
  .page-about .about-milestones__rail {
    position: sticky;
    top: calc(var(--header-h) + 2rem);
    flex-direction: column;
    align-items: stretch;
    gap: 0.25rem;
    padding: 1rem;
    overflow: visible;
  }
  .page-about .about-milestones__rail-title {
    margin: 0 0 0.6rem;
  }
  .page-about .about-milestones__rail-link {
    display: block;
    padding: 0.6rem 0;
    background: transparent;
    border: none;
    border-bottom: 1px solid rgba(35, 53, 84, 0.7);
    text-align: left;
  }
  .page-about .about-milestones__rail-link:hover,
  .page-about .about-milestones__rail-link:focus-visible {
    border-bottom: 1px solid var(--accent-green);
  }

  .page-about .about-timeline__item {
    grid-template-columns: 7rem minmax(0, 1fr);
    gap: 1.5rem;
    align-items: start;
    padding-bottom: 2.5rem;
  }
  .page-about .about-timeline__year {
    font-size: 2rem;
    text-align: right;
    padding-top: 0.35rem;
  }
  .page-about .about-timeline__card {
    padding: 1.35rem 1.5rem;
  }
  .page-about .about-milestones__media {
    max-width: var(--container-width);
    margin: 3.5rem auto 0;
  }

  .page-about .about-data {
    padding: 5rem 2rem;
  }
  .page-about .about-data__head {
    max-width: var(--container-width);
    margin: 0 auto 2rem;
  }
  .page-about .about-data__intro {
    font-size: 0.95rem;
  }
  .page-about .about-data__layout {
    max-width: var(--container-width);
    margin: 0 auto;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 2.5rem;
    align-items: start;
  }
  .page-about .about-data__chart {
    transform: translateY(-0.75rem);
  }
  .page-about .about-data__body {
    margin-top: 1.25rem;
  }
  .page-about .about-data__stats {
    max-width: var(--container-width);
    margin: 2.5rem auto 0;
  }

  .page-about .about-mission {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 5rem 2rem;
  }
  .page-about .about-mission__grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 1.25rem;
  }
  .page-about .about-mission__card {
    padding: 1.4rem 1.5rem;
  }
  .page-about .about-mission__num {
    font-size: 3rem;
  }
  .page-about .about-mission__values {
    display: grid;
    grid-template-columns: 16rem minmax(0, 1fr);
    gap: 1.5rem;
    align-items: start;
    padding: 1.5rem 1.75rem;
  }
  .page-about .about-mission__values ol {
    margin: 0;
  }
}