.page-about {
  --about-rail-w: 280px;
  --about-gap: 44px;
  display: block;
  padding: 32px 0 72px;
}

/* ---------- 网格骨架：左窄栏 + 右宽栏 ---------- */
.page-about .about-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  align-items: start;
}

@media (min-width: 1024px) {
  .page-about .about-grid {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: var(--about-gap);
  }
}

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

/* ---------- 左侧常驻年表 ---------- */
.page-about .about-rail {
  border-top: 2px solid var(--gold);
  padding-top: 14px;
  margin: 0;
}

@media (min-width: 1024px) {
  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h) + 24px);
    padding-bottom: 20px;
  }
}

.page-about .about-rail__kicker {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--gold);
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 10px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

.page-about .about-node a {
  display: block;
  white-space: nowrap;
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  text-decoration: none;
  transition: border-color 0.22s var(--ease), color 0.22s var(--ease);
}

.page-about .about-node a:hover,
.page-about .about-node a:focus-visible {
  border-color: var(--gold);
  color: var(--gold-lit);
}

.page-about .about-node__year {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 13px;
  color: var(--gold);
  margin-right: 6px;
}

.page-about .about-node__label {
  font-size: 12px;
}

.page-about .about-rail__foot {
  margin: 16px 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--muted);
}

@media (min-width: 1024px) {
  .page-about .about-rail__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
  }

  .page-about .about-node {
    position: relative;
  }

  .page-about .about-node a {
    position: relative;
    white-space: normal;
    border: 0;
    border-radius: 0;
    border-left: 1px solid var(--line);
    padding: 10px 0 16px 22px;
  }

  .page-about .about-node a::before {
    content: "";
    position: absolute;
    left: -4px;
    top: 16px;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--line);
    transition: background 0.22s var(--ease);
  }

  .page-about .about-node a:hover::before,
  .page-about .about-node a:focus-visible::before {
    background: var(--lime);
  }

  .page-about .about-node__year {
    display: block;
    margin: 0 0 4px;
    font-size: 15px;
  }

  .page-about .about-node__label {
    display: block;
    font-size: 13px;
    line-height: 1.5;
    color: var(--muted);
    transition: color 0.22s var(--ease);
  }

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

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-bottom: 44px;
}

.page-about .breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0 0 22px;
  padding: 0;
  font-size: 13px;
  color: var(--muted);
}

.page-about .breadcrumb-item + .breadcrumb-item::before {
  content: "/";
  margin-right: 8px;
  color: var(--line);
}

.page-about .breadcrumb-link {
  color: var(--muted);
  text-decoration: none;
  transition: color 0.22s var(--ease);
}

.page-about .breadcrumb-link:hover,
.page-about .breadcrumb-link:focus-visible {
  color: var(--gold-lit);
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  font-size: clamp(30px, 6vw, 44px);
  line-height: 1.14;
  font-weight: 900;
  letter-spacing: -0.01em;
  color: var(--paper);
  max-width: 17ch;
}

.page-about .about-hero .lede {
  margin: 20px 0 0;
  max-width: 62ch;
  font-size: var(--fs-body);
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-hero .media {
  margin-top: 30px;
}

/* ---------- 媒体容器 ---------- */
.page-about .media {
  position: relative;
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--ink-deep);
}

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

.page-about .media--21x9 img {
  aspect-ratio: 21 / 9;
}

.page-about .media--4x3 img {
  aspect-ratio: 4 / 3;
}

.page-about .about-figure {
  margin-top: 30px;
}

@media (min-width: 900px) {
  .page-about .about-figure {
    max-width: 620px;
  }
}

/* ---------- 章节 ---------- */
.page-about .about-section {
  padding: 48px 0 8px;
  border-top: 1px solid var(--line);
  min-width: 0;
}

.page-about .section-head {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 18px;
}

.page-about .section-title {
  margin: 0;
  font-size: clamp(22px, 3.2vw, 28px);
  font-weight: 900;
  line-height: 1.3;
  color: var(--paper);
}

.page-about .section-note {
  margin: 0 0 24px;
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-cols {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
  margin-top: 8px;
}

@media (min-width: 900px) {
  .page-about .about-cols {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 1fr);
    gap: 40px;
  }
}

.page-about .prose p {
  margin: 0 0 20px;
  max-width: 70ch;
  font-size: var(--fs-body);
  line-height: 1.85;
  color: var(--paper);
}

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

/* ---------- 引用式短注 ---------- */
.page-about .about-quote {
  margin: 0;
  padding: 6px 0 6px 20px;
  border-left: 3px solid var(--gold);
  font-size: 16px;
  line-height: 1.8;
  color: var(--gold-lit);
  align-self: start;
}

/* ---------- 注释面板 ---------- */
.page-about .side-note {
  border: 1px solid var(--line);
  border-left: 3px solid var(--gold);
  background: var(--panel);
  padding: 20px 20px 18px;
}

.page-about .side-note__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--gold);
}

.page-about .side-note__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .side-note__list li {
  position: relative;
  padding-left: 16px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--paper);
}

.page-about .side-note__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 6px;
  height: 6px;
  background: var(--lime);
}

/* ---------- 三条业务线卡片 ---------- */
.page-about .line-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  margin-top: 22px;
}

@media (min-width: 820px) {
  .page-about .line-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .line-list .card {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.page-about .line-list .card-title {
  margin: 14px 0 0;
  font-size: var(--fs-card);
  font-weight: 700;
  line-height: 1.35;
  color: var(--paper);
}

.page-about .line-list .card-body {
  margin-top: 10px;
}

.page-about .line-list .card-body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 团队分工 ---------- */
.page-about .team-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .team-row {
  display: grid;
  grid-template-columns: 1fr auto;
  grid-template-areas:
    "role num"
    "task task";
  gap: 6px 14px;
  align-items: center;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

@media (min-width: 600px) {
  .page-about .team-row {
    grid-template-columns: minmax(0, 0.9fr) 72px minmax(0, 1.7fr);
    grid-template-areas: "role num task";
    gap: 16px;
  }
}

.page-about .team-role {
  grid-area: role;
  font-size: 15px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .team-row .mono-num {
  grid-area: num;
  font-size: 22px;
  justify-self: end;
}

@media (min-width: 600px) {
  .page-about .team-row .mono-num {
    justify-self: start;
  }
}

.page-about .team-task {
  grid-area: task;
  font-size: 14px;
  line-height: 1.65;
  color: var(--muted);
}

/* ---------- 数据条 ---------- */
.page-about .stat-strip {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  margin: 22px 0 28px;
}

@media (min-width: 700px) {
  .page-about .stat-strip {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .stat {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 22px 20px;
  background: var(--ink);
}

.page-about .stat-num {
  font-family: var(--font-mono);
  font-size: clamp(30px, 5vw, 44px);
  font-weight: 700;
  line-height: 1;
  color: var(--lime);
}

.page-about .stat-label {
  font-size: 13px;
  line-height: 1.65;
  color: var(--muted);
}

/* ---------- 里程碑刻度 ---------- */
.page-about .mile-list {
  position: relative;
  list-style: none;
  margin: 26px 0 0;
  padding: 0 0 0 34px;
}

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

.page-about .mile-item {
  position: relative;
  padding-bottom: 28px;
}

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

.page-about .mile-item::before {
  content: "";
  position: absolute;
  left: -34px;
  top: 5px;
  width: 11px;
  height: 11px;
  box-sizing: border-box;
  border: 2px solid var(--gold);
  border-radius: 50%;
  background: var(--ink);
}

.page-about .mile-year {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--gold);
}

.page-about .mile-title {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--paper);
}

.page-about .mile-item p {
  margin: 0;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 按钮行 ---------- */
.page-about .link-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 28px 0 0;
}

/* ---------- 延伸导航 ---------- */
.page-about .about-next {
  margin-top: 24px;
  padding: 34px 0 8px;
  border-top: 1px solid var(--line);
}

.page-about .about-next__title {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--gold);
}

.page-about .about-next__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

@media (min-width: 760px) {
  .page-about .about-next__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-next__list a {
  display: block;
  padding: 16px 18px;
  border: 1px solid var(--line);
  font-size: 16px;
  font-weight: 700;
  color: var(--paper);
  text-decoration: none;
  transition: border-color 0.22s var(--ease), background 0.22s var(--ease);
}

.page-about .about-next__list a span {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  font-weight: 400;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .about-next__list a:hover,
.page-about .about-next__list a:focus-visible {
  border-color: var(--gold);
  background: var(--panel);
}