.page-about {
  --about-rail-line: rgba(244, 248, 246, .1);
  --about-cell: #0C2419;
  overflow-x: hidden;
}

.page-about .breadcrumb {
  padding-top: 20px;
  padding-bottom: 4px;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  padding-top: 6px;
}

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

.page-about .about-hero-index {
  display: flex;
  align-items: baseline;
  gap: 12px;
  border-bottom: 1px solid var(--about-rail-line);
  padding-bottom: 10px;
}

.page-about .about-hero-index .index-num {
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--signal);
}

.page-about .about-hero-axis {
  font-size: 12px;
  letter-spacing: .3em;
  color: var(--muted);
}

.page-about .about-hero-main h1 {
  margin: 14px 0 0;
  font-size: clamp(34px, 8vw, 60px);
  font-weight: 300;
  line-height: 1.06;
  letter-spacing: -.02em;
  color: var(--white);
}

.page-about .about-lede {
  margin: 20px 0 0;
  padding-left: 16px;
  border-left: 2px solid var(--signal);
  font-size: clamp(16px, 2.3vw, 20px);
  line-height: 1.65;
  color: var(--white);
}

.page-about .about-hero-copy {
  margin: 18px 0 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-hero-cta {
  margin-top: 26px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-hero-media {
  margin: 0;
}

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

/* ---------- 数据条 ---------- */

.page-about .about-metric-list {
  list-style: none;
  margin: 0;
  padding: 1px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--about-rail-line);
  border: 1px solid var(--about-rail-line);
}

.page-about .about-metric-list > li {
  background: var(--green-900);
  padding: 18px 14px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  transition: background-color var(--speed) linear;
}

.page-about .about-metric-list > li:hover {
  background: var(--green-700);
}

.page-about .about-metric-list .stat-value {
  display: block;
  font-size: clamp(26px, 5vw, 36px);
  font-weight: 400;
  line-height: 1;
  color: var(--white);
}

.page-about .about-metric-list .stat-value em {
  font-style: normal;
  font-size: .48em;
  margin-left: 3px;
  color: var(--signal);
}

.page-about .about-metric-list .stat-label {
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--muted);
}

/* ---------- 章节头（左索引栏 + 文本） ---------- */

.page-about .about-head {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  border-top: 1px solid var(--hairline-strong);
  padding-top: 18px;
}

.page-about .about-rail {
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.page-about .about-rail .section-index {
  font-size: 13px;
  letter-spacing: .16em;
  color: var(--signal);
}

.page-about .about-rail-label {
  font-size: 12px;
  letter-spacing: .28em;
  color: var(--muted);
}

.page-about .about-head-text .section-title {
  margin: 0;
  font-size: clamp(24px, 4.4vw, 38px);
  font-weight: 300;
  line-height: 1.18;
  letter-spacing: -.01em;
  color: var(--white);
}

.page-about .about-head-text .section-note {
  margin: 12px 0 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 版本折线图 ---------- */

.page-about .about-chart {
  margin: 30px 0 0;
  padding: 14px 12px 8px;
  border: 1px solid var(--hairline);
  background: var(--green-700);
  background-image:
    linear-gradient(var(--about-rail-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--about-rail-line) 1px, transparent 1px);
  background-size: 40px 40px;
}

.page-about .about-chart svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .about-chart-grid line {
  stroke: var(--green-500);
  stroke-width: 1;
}

.page-about .about-chart-step {
  fill: none;
  stroke: var(--signal);
  stroke-width: 2;
}

.page-about .about-chart-dot {
  fill: var(--green-900);
  stroke: var(--signal);
  stroke-width: 2;
}

.page-about .about-chart-dot.is-current {
  fill: var(--signal);
}

.page-about .about-chart-tags text {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  fill: var(--muted);
}

/* ---------- 版本时间轴 ---------- */

.page-about .vaxis {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  position: relative;
}

.page-about .vaxis::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: var(--green-500);
}

.page-about .vaxis-node {
  position: relative;
  padding: 0 0 30px 30px;
  display: grid;
  gap: 8px;
}

.page-about .vaxis-node:last-child {
  padding-bottom: 0;
}

.page-about .vaxis-node::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 13px;
  height: 13px;
  border: 1px solid var(--green-500);
  background: var(--green-900);
  transition: border-color var(--speed) linear, background-color var(--speed) linear;
}

.page-about .vaxis-node:hover::before,
.page-about .vaxis-node:focus-within::before {
  border-color: var(--signal);
  background: var(--signal);
}

.page-about .vaxis-node.is-current::before {
  border-color: var(--amber);
}

.page-about .vaxis-mark {
  display: flex;
  align-items: baseline;
  gap: 12px;
  font-family: var(--font-mono);
}

.page-about .vaxis-ver {
  font-size: 13px;
  letter-spacing: .14em;
  color: var(--signal);
}

.page-about .vaxis-year {
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--muted);
}

.page-about .vaxis-body {
  position: relative;
  padding-left: 0;
  transition: padding-left 160ms ease;
}

.page-about .vaxis-body::before {
  content: "";
  position: absolute;
  left: -14px;
  top: 6px;
  bottom: 6px;
  width: 2px;
  background: var(--signal);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform 160ms ease;
}

.page-about .vaxis-node:hover .vaxis-body,
.page-about .vaxis-node:focus-within .vaxis-body {
  padding-left: 10px;
}

.page-about .vaxis-node:hover .vaxis-body::before,
.page-about .vaxis-node:focus-within .vaxis-body::before {
  transform: scaleY(1);
}

.page-about .vaxis-title {
  margin: 0 0 8px;
  font-size: 19px;
  font-weight: 400;
  line-height: 1.35;
  color: var(--white);
}

.page-about .vaxis-body p {
  margin: 0;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 数据三环节 ---------- */

.page-about .about-flow-grid {
  margin-top: 30px;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
}

.page-about .about-flow-media {
  margin: 0;
}

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

.page-about .about-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--hairline);
}

.page-about .about-step {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 4px 16px;
  padding: 18px 0;
  border-bottom: 1px solid var(--hairline);
  transition: border-color var(--speed) linear;
}

.page-about .about-step:hover {
  border-bottom-color: var(--signal);
}

.page-about .about-step-num {
  grid-row: 1 / span 2;
  font-size: 22px;
  font-weight: 400;
  line-height: 1.1;
  color: var(--signal);
}

.page-about .about-step h3 {
  margin: 0;
  font-size: 18px;
  font-weight: 400;
  color: var(--white);
}

.page-about .about-step p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 团队 ---------- */

.page-about .about-team-grid {
  margin-top: 30px;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
}

.page-about .about-team-copy p {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

.page-about .about-table caption {
  text-align: left;
  padding-bottom: 10px;
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--muted);
}

.page-about .about-table th,
.page-about .about-table td {
  text-align: left;
  padding: 12px 10px;
  border-bottom: 1px solid var(--hairline);
  font-weight: 400;
}

.page-about .about-table thead th {
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--muted);
  border-bottom-color: var(--hairline-strong);
}

.page-about .about-table tbody th {
  color: var(--white);
}

.page-about .about-table td {
  text-align: right;
  color: var(--signal-soft);
}

.page-about .about-table tbody tr {
  transition: background-color var(--speed) linear;
}

.page-about .about-table tbody tr:hover {
  background: var(--graphite);
}

.page-about .about-table tfoot th,
.page-about .about-table tfoot td {
  border-bottom: none;
  border-top: 1px solid var(--hairline-strong);
  color: var(--white);
  font-size: 15px;
}

.page-about .about-table tfoot td {
  color: var(--signal);
}

/* ---------- 服务对象 ---------- */

.page-about .about-aud-grid {
  margin-top: 30px;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--about-rail-line);
  border: 1px solid var(--about-rail-line);
}

.page-about .about-aud {
  background: var(--green-900);
  padding: 22px 18px;
  transition: background-color var(--speed) linear;
}

.page-about .about-aud:hover {
  background: var(--green-700);
}

.page-about .about-aud-num {
  display: block;
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--signal);
}

.page-about .about-aud h3 {
  margin: 14px 0 10px;
  font-size: 18px;
  font-weight: 400;
  line-height: 1.35;
  color: var(--white);
}

.page-about .about-aud p {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--muted);
}

.page-about .about-eco {
  margin-top: 26px;
  padding: 22px 0 0;
  border-top: 1px solid var(--hairline-strong);
}

.page-about .about-eco-lead {
  margin: 0 0 16px;
  font-size: 15px;
  color: var(--muted);
}

.page-about .about-eco-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 20px;
}

.page-about .about-eco-list li {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .about-eco-num {
  font-size: clamp(24px, 4.4vw, 32px);
  font-weight: 400;
  line-height: 1;
  color: var(--white);
}

.page-about .about-eco-num em {
  font-style: normal;
  font-size: .5em;
  margin-left: 2px;
  color: var(--signal);
}

.page-about .about-eco-label {
  font-size: 12px;
  line-height: 1.5;
  letter-spacing: .04em;
  color: var(--muted);
}

/* ---------- 收尾 ---------- */

.page-about .about-cta-inner {
  border: 1px solid var(--hairline-strong);
  border-left: 2px solid var(--signal);
  padding: 26px 20px;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
}

.page-about .about-cta-text .section-title {
  margin: 0;
  font-size: clamp(22px, 3.6vw, 32px);
  font-weight: 300;
  line-height: 1.25;
  color: var(--white);
}

.page-about .about-cta-text p {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .about-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: flex-start;
}

/* ---------- 平板 ---------- */

@media (min-width: 640px) {
  .page-about .about-metric-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-metric-list > li {
    padding: 22px 18px;
  }

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

  .page-about .about-aud {
    padding: 26px 22px;
  }

  .page-about .about-eco-list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-cta-inner {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
    align-items: center;
    padding: 32px 28px;
  }
}

/* ---------- 桌面 ---------- */

@media (min-width: 960px) {
  .page-about .about-hero-grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: 24px 20px;
    align-items: start;
  }

  .page-about .about-hero-index {
    grid-column: 1 / 3;
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
    border-bottom: none;
    border-left: 1px solid var(--about-rail-line);
    padding: 0 0 0 14px;
    position: sticky;
    top: calc(var(--header-h) + 24px);
  }

  .page-about .about-hero-index .index-num {
    font-size: 40px;
    font-weight: 300;
    letter-spacing: .04em;
    line-height: 1;
  }

  .page-about .about-hero-axis {
    writing-mode: horizontal-tb;
    letter-spacing: .24em;
  }

  .page-about .about-hero-main {
    grid-column: 3 / 9;
  }

  .page-about .about-hero-media {
    grid-column: 9 / 13;
    margin-top: 56px;
  }

  .page-about .about-head {
    grid-template-columns: minmax(0, 2fr) minmax(0, 8fr) minmax(0, 2fr);
    gap: 24px;
  }

  .page-about .about-rail {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
    border-left: 1px solid var(--about-rail-line);
    padding-left: 14px;
    position: sticky;
    top: calc(var(--header-h) + 24px);
    align-self: start;
  }

  .page-about .about-rail .section-index {
    font-size: 32px;
    font-weight: 300;
    letter-spacing: .04em;
    line-height: 1;
  }

  .page-about .about-flow-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 32px;
    align-items: start;
  }

  .page-about .about-team-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 40px;
    align-items: start;
  }

  .page-about .about-metric-list {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }

  .page-about .about-metric-list > li {
    padding: 26px 20px;
  }

  .page-about .about-aud-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}
<<<END>>>