.page-about {
  --about-pad: clamp(48px, 7.5vw, 112px);
  --tl-pad: clamp(18px, 3vw, 32px);
  padding-top: calc(var(--shell-h, 88px) + clamp(20px, 4vw, 48px));
  padding-bottom: clamp(64px, 10vw, 150px);
  background: var(--ink-900);
  color: var(--white);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.75;
  overflow-x: hidden;
}

.page-about .lede {
  font-size: clamp(16px, 1.6vw, 19px);
  line-height: 1.85;
  color: var(--white);
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  margin-bottom: clamp(24px, 4vw, 52px);
}

/* ---------- 首屏声明 ---------- */
.page-about .about-hero {
  padding-bottom: clamp(40px, 6vw, 88px);
}

.page-about .about-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 56px);
  align-items: end;
}

.page-about .about-hero-idx {
  margin: 0 0 16px;
  font-size: 12px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--blue);
}

.page-about .about-title {
  margin: 0 0 20px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(36px, 6vw, 88px);
  line-height: 0.98;
  letter-spacing: -0.025em;
  color: var(--white);
}

.page-about .about-hero-lede {
  max-width: 58ch;
  margin: 0 0 clamp(24px, 3vw, 40px);
  color: var(--muted);
}

.page-about .about-keyline {
  display: flex;
  flex-wrap: wrap;
  gap: clamp(18px, 3vw, 48px);
  margin: 0;
  padding: clamp(18px, 2.4vw, 24px) 0 0;
  border-top: 1px solid var(--line);
  list-style: none;
}

.page-about .about-keyline li {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.page-about .about-keyline-num {
  font-size: clamp(24px, 3vw, 34px);
  font-weight: 500;
  line-height: 1.1;
  color: var(--green);
  font-variant-numeric: tabular-nums;
}

.page-about .about-keyline-label {
  font-size: 13px;
  color: var(--muted);
}

/* ---------- 图片容器 ---------- */
.page-about .about-media {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--ink-800);
  overflow: hidden;
  box-shadow: 0 0 32px rgba(46, 123, 255, 0.08);
}

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

.page-about .about-media .media-caption {
  padding: 10px 14px;
  border-top: 1px solid var(--line);
  font-size: 12.5px;
  color: var(--muted);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-sec {
  padding-block: var(--about-pad);
  border-top: 1px solid var(--line);
}

.page-about .about-sec-head {
  display: flex;
  flex-direction: column;
  gap: 12px;
  max-width: 64ch;
  margin-bottom: clamp(28px, 4vw, 56px);
}

.page-about .about-sec-idx {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--blue);
}

.page-about .about-sec-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(28px, 4.4vw, 58px);
  line-height: 1.05;
  letter-spacing: -0.02em;
}

.page-about .about-sec-lede {
  margin: 0;
  max-width: 68ch;
  color: var(--muted);
}

.page-about .about-prose p {
  max-width: 68ch;
  margin: 0 0 18px;
}

.page-about .about-prose p:last-child {
  margin-bottom: 0;
}

/* ---------- 四条产品线索引 ---------- */
.page-about .about-lines {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: clamp(32px, 4vw, 56px);
  border: 1px solid var(--line);
  background: var(--line);
}

.page-about .about-line-link {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: clamp(18px, 2.4vw, 26px);
  background: var(--ink-900);
  text-decoration: none;
  color: inherit;
  transition: background 180ms var(--ease);
}

.page-about .about-line-link:hover,
.page-about .about-line-link:focus-visible {
  background: var(--ink-800);
}

.page-about .about-line-name {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(17px, 1.8vw, 21px);
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .about-line-link:hover .about-line-name {
  color: var(--blue);
}

.page-about .about-line-desc {
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  padding-left: var(--tl-pad);
  border-left: 1px solid var(--line);
}

.page-about .about-node {
  position: relative;
  padding-bottom: clamp(20px, 3vw, 34px);
}

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

.page-about .about-node::before {
  content: "";
  position: absolute;
  left: calc(-1 * var(--tl-pad) - 7px);
  top: 8px;
  box-sizing: border-box;
  width: 13px;
  height: 13px;
  border: 1px solid var(--blue);
  border-radius: 50%;
  background: var(--ink-900);
}

.page-about .about-node[open]::before {
  border-color: var(--green);
  background: var(--green);
}

.page-about .about-node-head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 0 0 4px;
  cursor: pointer;
  list-style: none;
}

.page-about .about-node-head::-webkit-details-marker {
  display: none;
}

.page-about .about-node-idx {
  flex: none;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--blue);
}

.page-about .about-node-title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(17px, 2vw, 23px);
  line-height: 1.35;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .about-node-chev {
  margin-left: auto;
  flex: none;
  font-size: 18px;
  line-height: 1;
  color: var(--muted);
  transition: transform 150ms var(--ease), color 150ms var(--ease);
}

.page-about .about-node[open] .about-node-chev {
  transform: rotate(45deg);
  color: var(--green);
}

.page-about .about-node-body {
  padding-top: 10px;
  max-width: 68ch;
}

.page-about .about-node-body p {
  margin: 0 0 8px;
  color: var(--muted);
}

.page-about .about-node-meta {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--blue);
}

/* ---------- 团队 ---------- */
.page-about .about-team-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 56px);
  align-items: start;
}

.page-about .about-stack {
  display: flex;
  height: 20px;
  border: 1px solid var(--line);
  background: var(--ink-800);
  overflow: hidden;
}

.page-about .about-stack > span {
  display: block;
  height: 100%;
  transition: filter 180ms var(--ease);
}

.page-about .about-stack > span:hover {
  filter: brightness(1.4);
}

.page-about .seg-dev {
  background: var(--blue);
}

.page-about .seg-sup {
  background: var(--green);
}

.page-about .seg-biz {
  background: var(--ink-700);
  border-inline: 1px solid var(--line);
}

.page-about .seg-ops {
  background: var(--line);
}

.page-about .about-stack-legend {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin: 1px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-stack-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-swatch {
  flex: none;
  width: 12px;
  height: 12px;
  display: block;
}

.page-about .about-stack-role {
  font-size: 15px;
  color: var(--white);
}

.page-about .about-stack-num {
  margin-left: auto;
  font-size: 14px;
  color: var(--green);
  font-variant-numeric: tabular-nums;
}

.page-about .about-team-note {
  max-width: 68ch;
  margin: clamp(20px, 2.6vw, 28px) 0 0;
  font-size: 15px;
  color: var(--muted);
}

.page-about .about-team-figure {
  width: 100%;
}

/* ---------- 服务网络 ---------- */
.page-about .about-network-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 52px);
  align-items: start;
}

.page-about .about-net-list {
  margin: 0 0 clamp(20px, 2.6vw, 30px);
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .about-net-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-net-row dt {
  font-size: 15px;
  color: var(--muted);
}

.page-about .about-net-row dd {
  margin: 0;
  font-size: 16px;
  color: var(--white);
}

.page-about .about-net-row dd .mono {
  font-size: 20px;
  color: var(--green);
  font-variant-numeric: tabular-nums;
}

.page-about .about-scene-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 14px;
}

.page-about .about-scene-list li {
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-scene-list .tag {
  margin-right: 6px;
}

/* ---------- 用户反馈 ---------- */
.page-about .about-voices {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3vw, 40px);
}

.page-about .about-voice {
  margin: 0;
  padding: 4px 0 4px clamp(16px, 2.4vw, 28px);
  border-left: 2px solid var(--orange);
}

.page-about .about-voice .tag {
  display: inline-block;
  margin-bottom: 12px;
}

.page-about .about-voice p {
  margin: 0 0 12px;
  font-size: 17px;
  line-height: 1.9;
  color: var(--white);
}

.page-about .about-voice-from {
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--muted);
}

/* ---------- 资质与合作 ---------- */
.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1px;
  border: 1px solid var(--line);
  background: var(--line);
}

.page-about .about-fact {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: clamp(18px, 2.4vw, 28px);
  background: var(--ink-900);
}

.page-about .about-fact-num {
  font-size: clamp(28px, 3.6vw, 44px);
  font-weight: 500;
  line-height: 1;
  color: var(--green);
  font-variant-numeric: tabular-nums;
}

.page-about .about-fact-label {
  font-size: 13.5px;
  color: var(--muted);
}

.page-about .about-credit-notes {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3vw, 44px);
  margin-top: clamp(32px, 4vw, 52px);
}

.page-about .about-credit-title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(16px, 1.6vw, 19px);
  letter-spacing: -0.01em;
  color: var(--white);
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-credit-note p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-cta {
  display: flex;
  flex-direction: column;
  gap: 18px;
  margin-top: clamp(36px, 5vw, 64px);
  padding-top: clamp(24px, 3vw, 36px);
  border-top: 1px solid var(--line);
}

.page-about .about-cta-text {
  margin: 0;
  max-width: 52ch;
  font-size: 16px;
  color: var(--white);
}

.page-about .about-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-lines {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-stack-legend {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(20px, 3vw, 40px);
  }

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

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

  .page-about .about-cta {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
}

@media (min-width: 1024px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

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

  .page-about .about-team-layout {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    column-gap: clamp(32px, 4vw, 64px);
  }

  .page-about .about-network-layout {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
  }

  .page-about .about-voices {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-credit-notes {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 1280px) {
  .page-about .about-hero-grid {
    column-gap: clamp(48px, 5vw, 88px);
  }

  .page-about .about-team-layout {
    grid-template-columns: minmax(0, 7fr) minmax(0, 3fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-node-chev,
  .page-about .about-stack > span,
  .page-about .about-line-link {
    transition: none;
  }
}
</final>