.page-about {
  --about-pad: clamp(18px, 3.6vw, 40px);
  --about-gap: clamp(18px, 3vw, 32px);
  padding-bottom: clamp(48px, 7vw, 96px);
  color: var(--ice);
}

.page-about .about-crumbs {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 20px var(--gutter) 0;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  max-width: var(--shell);
  margin: clamp(14px, 2.4vw, 24px) auto 0;
  padding: 0 var(--gutter);
}

.page-about .about-hero-inner {
  position: relative;
  border: var(--edge) solid var(--line);
  background: var(--panel);
  box-shadow: var(--shadow-hard);
  overflow: hidden;
}

.page-about .about-hero-inner::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: min(52%, 420px);
  height: 6px;
  background: linear-gradient(90deg, var(--orange), var(--yellow));
}

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

.page-about .about-hero-copy h1 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(32px, 6.6vw, 62px);
  line-height: 1.03;
  letter-spacing: -0.01em;
  margin: 10px 0 0;
  color: var(--ice);
}

.page-about .about-lede {
  max-width: 34em;
  margin: 18px 0 0;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.85;
  color: var(--ice);
  opacity: 0.88;
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-hero-side {
  border-top: var(--edge) solid var(--line);
  padding-top: 18px;
  min-width: 0;
}

.page-about .about-side-label {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--orange);
}

.page-about .about-toc {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .about-toc a {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  align-items: center;
  gap: 8px;
  padding: 8px 10px;
  border-left: 3px solid transparent;
  color: var(--mute);
  font-size: 14px;
  text-decoration: none;
  transition: color var(--dur) var(--ease), background var(--dur) var(--ease),
    border-color var(--dur) var(--ease);
}

.page-about .about-toc a .mono {
  color: var(--line);
  font-size: 12px;
}

.page-about .about-toc a:hover {
  color: var(--ice);
  background: var(--raise);
  border-left-color: var(--yellow);
}

.page-about .about-toc a:hover .mono {
  color: var(--cyan);
}

.page-about .about-toc a:focus-visible {
  outline: 2px solid var(--yellow);
  outline-offset: 2px;
  color: var(--ice);
  background: var(--raise);
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: var(--edge) solid var(--line);
  background: var(--ink);
}

.page-about .about-stat {
  display: grid;
  gap: 4px;
  padding: 16px 18px;
  border-left: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  min-width: 0;
}

.page-about .about-stat-num {
  font-family: var(--font-mono);
  font-size: clamp(24px, 3vw, 32px);
  line-height: 1;
  color: var(--cyan);
  letter-spacing: -0.02em;
}

.page-about .about-stat-label {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mute);
  overflow-wrap: anywhere;
}

/* ---------- 章节骨架 ---------- */
.page-about .about-chapter {
  max-width: var(--shell);
  margin: 0 auto;
  padding: clamp(34px, 5vw, 66px) var(--gutter) 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(14px, 2.4vw, 24px);
}

.page-about .ch-rail {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-mono);
}

.page-about .ch-num {
  font-size: 28px;
  line-height: 1;
  letter-spacing: 0.04em;
  color: var(--orange);
}

.page-about .ch-label {
  font-size: 11px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--mute);
}

.page-about .ch-vert {
  display: none;
}

.page-about .ch-body {
  min-width: 0;
}

.page-about .ch-body h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(23px, 3.5vw, 34px);
  line-height: 1.16;
  letter-spacing: -0.005em;
  margin: 0 0 14px;
  color: var(--ice);
}

.page-about .ch-body h3,
.page-about .ch-sub {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.01em;
  margin: 0 0 10px;
  color: var(--cyan);
}

.page-about .ch-body p {
  margin: 0 0 12px;
  max-width: 36em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ice);
  opacity: 0.86;
}

.page-about .ch-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
  margin-top: 6px;
}

/* ---------- 要点条 ---------- */
.page-about .ch-points {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .ch-points li {
  display: grid;
  grid-template-columns: minmax(64px, auto) minmax(0, 1fr);
  gap: 12px;
  align-items: baseline;
  padding: 11px 14px;
  background: var(--panel);
  border-left: 3px solid var(--cyan);
  font-size: 14px;
  line-height: 1.7;
  color: var(--ice);
}

.page-about .pt-key {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--cyan);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 0;
  min-width: 0;
}

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

.page-about .about-figure figcaption {
  margin-top: 10px;
  padding-left: 10px;
  border-left: 3px solid var(--orange);
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: 0.04em;
  color: var(--mute);
}

/* ---------- 标签 ---------- */
.page-about .about-tags {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 18px 0 0;
  padding: 0;
}

.page-about .about-tags li {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  padding: 6px 10px;
  border: 1px solid var(--line);
  color: var(--mute);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-tags li:hover {
  color: var(--cyan);
  border-color: var(--cyan);
}

.page-about .about-tags li:last-child {
  border-color: var(--orange);
  color: var(--orange);
}

/* ---------- 三级流程 ---------- */
.page-about .about-flow {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .about-flow li {
  position: relative;
  padding: 18px;
  background: var(--panel);
  border: var(--edge) solid var(--line);
  box-shadow: var(--shadow-hard);
  transition: transform var(--dur) var(--ease), background var(--dur) var(--ease),
    border-color var(--dur) var(--ease);
}

.page-about .about-flow li:hover {
  transform: translate(-3px, -3px);
  background: var(--raise);
  border-color: var(--cyan);
}

.page-about .flow-num {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--orange);
}

.page-about .flow-title {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  color: var(--ice);
}

.page-about .about-flow p {
  margin: 0;
  max-width: none;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mute);
  opacity: 1;
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: 20px;
}

.page-about .team-card {
  position: relative;
  padding: 18px;
  background: var(--panel);
  border: var(--edge) solid var(--line);
  padding-bottom: 24px;
  transition: transform var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .team-card::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  background: var(--cyan);
  transform: scaleX(0.32);
  transform-origin: left;
  transition: transform var(--dur) var(--ease);
}

.page-about .team-card:hover {
  transform: translateY(-4px);
  background: var(--raise);
}

.page-about .team-card:hover::after {
  transform: scaleX(1);
}

.page-about .team-role {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--orange);
  margin-bottom: 8px;
}

.page-about .team-card h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  color: var(--ice);
}

.page-about .team-card p {
  margin: 0;
  max-width: none;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mute);
  opacity: 1;
}

.page-about .about-quote {
  margin: 22px 0 0;
  padding: 16px 18px;
  background: var(--raise);
  border-left: 4px solid var(--orange);
  font-size: 15px;
  line-height: 1.8;
  color: var(--ice);
  max-width: 44em;
}

/* ---------- 通用列表 ---------- */
.page-about .about-list {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: grid;
}

.page-about .about-list li {
  position: relative;
  padding: 11px 0 11px 24px;
  border-bottom: 1px solid var(--line);
  font-size: 14px;
  line-height: 1.75;
  color: var(--ice);
  opacity: 0.9;
}

.page-about .about-list li::before {
  content: "▸";
  position: absolute;
  left: 0;
  top: 10px;
  color: var(--cyan);
  font-size: 13px;
}

.page-about .about-list strong {
  color: var(--cyan);
  font-weight: 600;
}

/* ---------- 时间轴 ---------- */
.page-about .about-chapter--timeline .ch-body {
  border-top: 1px dashed var(--line);
  padding-top: 18px;
}

.page-about .about-timeline {
  margin-top: 22px;
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(215px, 78%);
  gap: 14px;
  overflow-x: auto;
  padding: 4px 4px 18px;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
}

.page-about .tl-node {
  scroll-snap-align: start;
  padding: 16px 14px 18px;
  background: var(--panel);
  border: var(--edge) solid var(--line);
  border-top: 4px solid var(--orange);
  min-height: 168px;
  transition: transform var(--dur) var(--ease), background var(--dur) var(--ease),
    border-color var(--dur) var(--ease);
}

.page-about .tl-node:hover {
  transform: translateY(-4px);
  background: var(--raise);
  border-color: var(--cyan);
  border-top-color: var(--yellow);
}

.page-about .tl-node:focus-visible {
  outline: 2px solid var(--yellow);
  outline-offset: 3px;
  background: var(--raise);
  border-color: var(--cyan);
}

.page-about .tl-ver {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--orange);
}

.page-about .tl-title {
  display: block;
  margin: 8px 0 7px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  line-height: 1.2;
  color: var(--ice);
}

.page-about .tl-desc {
  display: block;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mute);
}

/* ---------- 收尾 CTA ---------- */
.page-about .about-cta {
  margin-top: 26px;
  padding: 20px;
  display: grid;
  gap: 16px;
  background: var(--panel);
  border: var(--edge) solid var(--line);
  box-shadow: var(--shadow-hard);
  justify-items: start;
}

.page-about .about-cta p {
  margin: 0;
  max-width: 40em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ice);
  opacity: 0.88;
}

/* ---------- 响应式 ---------- */
@media (min-width: 760px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

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

  .page-about .about-chapter--timeline .ch-body {
    border-top: 0;
    padding-top: 0;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1fr) 244px;
    align-items: start;
  }

  .page-about .about-hero-side {
    border-top: 0;
    border-left: var(--edge) solid var(--line);
    padding-top: 0;
    padding-left: 18px;
  }

  .page-about .about-chapter {
    grid-template-columns: 78px minmax(0, 1fr);
    gap: clamp(22px, 3.4vw, 42px);
  }

  .page-about .ch-rail {
    flex-direction: column;
    align-items: flex-start;
    gap: 14px;
    align-self: start;
    position: sticky;
    top: 104px;
    padding-right: 14px;
    border-right: 1px solid var(--line);
  }

  .page-about .ch-num {
    font-size: 40px;
  }

  .page-about .ch-vert {
    display: block;
    writing-mode: vertical-rl;
    margin-top: 6px;
    font-size: 10px;
    letter-spacing: 0.34em;
    text-transform: uppercase;
    color: var(--line);
  }
}

@media (min-width: 1000px) {
  .page-about .ch-split {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .ch-split--flip .about-figure {
    order: -1;
  }

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 24px;
  }
}

@media (min-width: 1100px) {
  .page-about .about-timeline {
    grid-auto-columns: minmax(0, 1fr);
    grid-auto-flow: row;
    grid-template-columns: repeat(6, minmax(0, 1fr));
    overflow: visible;
    padding-bottom: 4px;
  }

  .page-about .tl-node {
    min-height: 190px;
  }
}
<<<PAGE_CSS_END>>>