.page-about {
  --about-rail-w: 246px;
}

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

.page-about .breadcrumbs {
  margin: 20px 0 0;
  font-size: 13px;
  color: var(--muted);
}

.page-about .breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 10px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .breadcrumbs li + li::before {
  content: "/";
  margin-right: 10px;
  color: var(--line);
}

.page-about .breadcrumbs a {
  color: var(--muted);
  text-decoration: none;
  transition: color 0.18s var(--ease);
}

.page-about .breadcrumbs a:hover,
.page-about .breadcrumbs a:focus-visible {
  color: var(--cyan);
}

.page-about .breadcrumbs [aria-current="page"] {
  color: var(--paper);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
  padding: 28px 0 56px;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-hero h1 {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(32px, 7vw, 60px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  margin: 14px 0 0;
  color: var(--paper);
  max-width: 15em;
}

.page-about .about-hero__lede {
  margin: 18px 0 0;
  max-width: 34em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 28px;
  background: var(--line-faint);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-hero__stat {
  background: var(--ink-900);
  padding: 14px 16px 15px;
  border-left: 2px solid transparent;
  transition: border-color 0.18s var(--ease), background-color 0.18s var(--ease);
}

.page-about .about-hero__stat:nth-child(odd) {
  border-left-color: var(--cyan);
}

.page-about .about-hero__stat:nth-child(even) {
  border-left-color: var(--orange);
}

.page-about .about-hero__stat b {
  display: block;
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-about .about-hero__stat span {
  display: block;
  margin-top: 5px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.page-about .about-hero__media {
  position: relative;
  margin: 0;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--ink-900);
  box-shadow: var(--shadow-panel);
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  opacity: 0.9;
}

.page-about .about-hero__caption {
  position: absolute;
  left: 14px;
  bottom: 12px;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--paper);
  background: rgba(6, 26, 19, 0.72);
  border-left: 2px solid var(--cyan);
  padding: 5px 10px;
}

/* ---------- 页面主栅格 ---------- */

.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 40px;
  padding: 0 0 72px;
}

.page-about .about-stream {
  min-width: 0;
}

.page-about .about-rail {
  display: none;
}

/* ---------- 章节 ---------- */

.page-about .about-chapter {
  position: relative;
  padding: 48px 0 0;
  margin-top: 48px;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-chapter:first-child {
  margin-top: 44px;
  border-top: 0;
  padding-top: 0;
}

.page-about .chapter__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.32em;
  color: var(--cyan);
  margin: 0;
}

.page-about .chapter__title {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(24px, 4.4vw, 36px);
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--paper);
  margin: 10px 0 0;
  padding-right: 24px;
}

.page-about .chapter__note {
  display: inline-block;
  margin: 12px 0 0;
  writing-mode: horizontal-tb;
  font-size: 11px;
  letter-spacing: 0.24em;
  color: var(--line);
}

.page-about .about-lead {
  margin: 22px 0 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--muted);
  max-width: 40em;
}

.page-about .about-body {
  margin-top: 22px;
  max-width: 42em;
}

.page-about .about-body p {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--muted);
}

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

/* ---------- 人群卡片 ---------- */

.page-about .crowd-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: 26px;
}

.page-about .crowd {
  position: relative;
  padding: 20px 20px 22px;
  background: var(--ink-900);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  transition: border-color 0.18s var(--ease), background-color 0.18s var(--ease),
    transform 0.18s var(--ease);
}

.page-about .crowd:hover,
.page-about .crowd:focus-within {
  border-color: var(--cyan);
  background: var(--ink-800);
  transform: translateY(-2px);
}

.page-about .crowd__kicker {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--orange);
}

.page-about .crowd__title {
  margin: 10px 0 0;
  font-family: var(--font-head);
  font-size: 19px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-about .crowd__text {
  margin: 10px 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 业务线手风琴 ---------- */

.page-about .line-list {
  margin-top: 26px;
  border-top: 1px solid var(--line-soft);
}

.page-about .line-item {
  border-bottom: 1px solid var(--line-soft);
}

.page-about .line-item summary {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 14px;
  padding: 18px 42px 16px 4px;
  cursor: pointer;
  list-style: none;
  transition: background-color 0.18s var(--ease);
}

.page-about .line-item summary::-webkit-details-marker {
  display: none;
}

.page-about .line-item summary::after {
  content: "+";
  position: absolute;
  right: 8px;
  top: 15px;
  font-family: var(--font-mono);
  font-size: 17px;
  line-height: 1;
  color: var(--cyan);
}

.page-about .line-item[open] summary::after {
  content: "−";
}

.page-about .line-item summary:hover {
  background: rgba(18, 61, 46, 0.5);
}

.page-about .line-item summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

.page-about .line-item__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--line);
  min-width: 26px;
}

.page-about .line-item__name {
  font-family: var(--font-head);
  font-size: 19px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .line-item__tag {
  font-size: 10.5px;
  letter-spacing: 0.2em;
  color: var(--muted);
}

.page-about .line-item__body {
  padding: 0 12px 22px 44px;
}

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

/* ---------- 配图 ---------- */

.page-about .about-figure {
  position: relative;
  margin: 30px 0 0;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--ink-900);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  opacity: 0.88;
  transition: opacity 0.2s var(--ease);
}

.page-about .about-figure:hover img {
  opacity: 1;
}

.page-about .about-figure__label {
  position: absolute;
  left: 14px;
  bottom: 12px;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--paper);
  background: rgba(6, 26, 19, 0.74);
  border-left: 2px solid var(--orange);
  padding: 5px 10px;
}

/* ---------- 团队表格 ---------- */

.page-about .team-scroll {
  margin-top: 24px;
  overflow-x: auto;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  background: var(--ink-900);
}

.page-about .team-table {
  width: 100%;
  min-width: 480px;
  border-collapse: collapse;
  font-size: 14.5px;
  color: var(--muted);
}

.page-about .team-table th {
  text-align: left;
  padding: 12px 16px;
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.16em;
  color: var(--line);
  background: var(--ink-800);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .team-table td {
  padding: 15px 16px;
  border-bottom: 1px solid var(--line-faint);
  vertical-align: top;
  line-height: 1.75;
}

.page-about .team-table tbody tr:last-child td {
  border-bottom: 0;
}

.page-about .team-table td:first-child {
  color: var(--paper);
  font-weight: 600;
  white-space: nowrap;
}

.page-about .team-table__num {
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--cyan);
  width: 66px;
}

.page-about .team-table tbody tr {
  transition: background-color 0.18s var(--ease);
}

.page-about .team-table tbody tr:hover {
  background: rgba(27, 90, 69, 0.28);
}

/* ---------- 更新节奏 ---------- */

.page-about .rhythm-list {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .rhythm {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  padding: 16px 18px;
  background: var(--ink-900);
  border: 1px solid var(--line-soft);
  border-left: 2px solid var(--line);
  border-radius: var(--radius);
  transition: border-left-color 0.18s var(--ease), background-color 0.18s var(--ease);
}

.page-about .rhythm:hover {
  border-left-color: var(--cyan);
  background: var(--ink-800);
}

.page-about .rhythm__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 里程碑时间轴 ---------- */

.page-about .timeline {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
}

.page-about .timeline__item {
  position: relative;
  padding: 0 0 30px 28px;
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ink-950);
  border: 1px solid var(--line);
  transition: border-color 0.18s var(--ease), background-color 0.18s var(--ease),
    box-shadow 0.18s var(--ease);
}

.page-about .timeline__item::after {
  content: "";
  position: absolute;
  left: 5px;
  top: 22px;
  bottom: 0;
  width: 1px;
  background: var(--line-soft);
}

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

.page-about .timeline__item:last-child::after {
  display: none;
}

.page-about .timeline__item:hover::before {
  border-color: var(--cyan);
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(53, 240, 208, 0.14);
}

.page-about .timeline__year {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 17px;
  letter-spacing: 0.08em;
  color: var(--cyan);
}

.page-about .timeline__head {
  margin: 6px 0 0;
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .timeline__text {
  margin: 8px 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--muted);
  max-width: 34em;
}

/* ---------- 合作生态 ---------- */

.page-about .eco-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin-top: 26px;
}

.page-about .eco {
  padding: 20px;
  background: var(--ink-800);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  transition: transform 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-about .eco:hover {
  transform: translateY(-2px);
  border-color: var(--cyan);
}

.page-about .eco__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 34px;
  font-weight: 600;
  line-height: 1;
  color: var(--paper);
}

.page-about .eco__label {
  margin: 10px 0 0;
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.page-about .eco__text {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 服务承诺 ---------- */

.page-about .promise {
  margin-top: 22px;
  padding: 22px 20px 24px;
  background: linear-gradient(160deg, var(--ink-800), var(--ink-900));
  border: 1px solid var(--line-soft);
  border-left: 2px solid var(--orange);
  border-radius: var(--radius);
  box-shadow: var(--shadow-panel);
}

.page-about .promise p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
  max-width: 40em;
}

.page-about .promise__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

/* ---------- 侧栏 ---------- */

.page-about .rail-sticky {
  border-left: 1px solid var(--line-soft);
  padding: 4px 0 4px 20px;
}

.page-about .rail-sticky .eyebrow {
  margin: 0 0 14px;
  font-size: 11px;
  letter-spacing: 0.24em;
  color: var(--line);
}

.page-about .rail-axis {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .rail-axis::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: var(--line-soft);
}

.page-about .rail-axis a {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 0 9px 22px;
  font-size: 13px;
  color: var(--muted);
  text-decoration: none;
  transition: color 0.18s var(--ease);
}

.page-about .rail-axis a::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 11px;
  height: 11px;
  border-radius: 50%;
  border: 1px solid var(--line);
  background: var(--ink-950);
  transition: border-color 0.18s var(--ease), background-color 0.18s var(--ease),
    box-shadow 0.18s var(--ease);
}

.page-about .rail-axis a:hover,
.page-about .rail-axis a:focus-visible {
  color: var(--paper);
}

.page-about .rail-axis a:hover::before,
.page-about .rail-axis a:focus-visible::before {
  border-color: var(--cyan);
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(53, 240, 208, 0.16);
}

.page-about .rail-axis a:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

.page-about .rail-axis__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--line);
}

.page-about .rail-foot {
  display: grid;
  gap: 8px;
  margin-top: 20px;
  padding-top: 18px;
  border-top: 1px solid var(--line-faint);
}

/* ---------- 响应式 ---------- */

@media (min-width: 620px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

  .page-about .rhythm {
    grid-template-columns: 132px minmax(0, 1fr);
    align-items: start;
    gap: 6px 16px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.94fr);
    align-items: end;
    gap: 46px;
    padding: 40px 0 68px;
  }

  .page-about .about-hero__media img {
    aspect-ratio: 4 / 3;
  }

  .page-about .chapter__note {
    position: absolute;
    right: 0;
    top: 52px;
    margin: 0;
    writing-mode: vertical-rl;
    letter-spacing: 0.3em;
  }

  .page-about .chapter__title {
    padding-right: 34px;
  }

  .page-about .line-item__body {
    padding-left: 52px;
    padding-right: 40px;
  }
}

@media (min-width: 1000px) {
  .page-about .about-layout {
    grid-template-columns: minmax(0, 1fr) var(--about-rail-w);
    gap: 56px;
  }

  .page-about .about-rail {
    display: block;
  }

  .page-about .rail-sticky {
    position: sticky;
    top: calc(var(--topbar-h) + 26px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition-duration: 0.01ms !important;
  }

  .page-about .crowd:hover,
  .page-about .crowd:focus-within,
  .page-about .eco:hover {
    transform: none;
  }
}
<<<PAGE_CSS_END>>>