.page-about {
  --idx-w: 88px;
  background: var(--ink);
  color: var(--text);
  font-family: var(--f-cn);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 30px 0 58px;
  border-bottom: 1px solid var(--line);
  isolation: isolate;
}
.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(to right, var(--line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--line) 1px, transparent 1px);
  background-size: 88px 88px;
  opacity: .34;
  -webkit-mask-image: linear-gradient(180deg, #000 0%, transparent 84%);
  mask-image: linear-gradient(180deg, #000 0%, transparent 84%);
  pointer-events: none;
}

.page-about .breadcrumb { margin: 0 0 26px; }
.page-about .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .breadcrumb__list li {
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--muted);
}
.page-about .breadcrumb__list li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--line);
}
.page-about .breadcrumb__list a {
  color: var(--muted);
  text-decoration: none;
  transition: color var(--dur) var(--ease);
}
.page-about .breadcrumb__list a:hover { color: var(--gold-b); }

.page-about .about-hero__grid {
  display: grid;
  gap: 34px;
}
.page-about .about-hero .eyebrow {
  margin: 0 0 16px;
  color: var(--cyan);
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: .16em;
}
.page-about .about-hero h1 {
  margin: 0 0 18px;
  font-size: clamp(30px, 5.4vw, 52px);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -.02em;
  color: var(--text);
}
.page-about .about-hero__lede {
  margin: 0 0 26px;
  max-width: 40ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.82;
  color: var(--muted);
}
.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-board {
  position: relative;
  display: grid;
  grid-template-columns: 1fr 1fr;
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
  background: rgba(13, 38, 32, .58);
}
.page-about .about-board > * {
  padding: 20px 16px 18px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.page-about .about-board .stat { background: transparent; }
.page-about .about-board .stat__value {
  display: block;
  font-family: var(--f-mono);
  font-size: 26px;
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -.01em;
  color: var(--gold-b);
}
.page-about .about-board .stat__label {
  display: block;
  margin-top: 7px;
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--muted);
}

.page-about .about-board__tick {
  position: absolute;
  width: 20px;
  height: 20px;
  border: 0 solid var(--gold);
  opacity: 0;
  pointer-events: none;
  animation: about-tick .34s var(--ease) forwards;
}
.page-about .about-board__tick--tl { top: -1px; left: -1px; border-top-width: 2px; border-left-width: 2px; animation-delay: .12s; }
.page-about .about-board__tick--tr { top: -1px; right: -1px; border-top-width: 2px; border-right-width: 2px; animation-delay: .24s; }
.page-about .about-board__tick--bl { bottom: -1px; left: -1px; border-bottom-width: 2px; border-left-width: 2px; animation-delay: .36s; }
.page-about .about-board__tick--br { bottom: -1px; right: -1px; border-bottom-width: 2px; border-right-width: 2px; animation-delay: .48s; }

@keyframes about-tick {
  to { opacity: 1; }
}

/* ---------- 主体布局 ---------- */
.page-about .about-layout {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 var(--pad);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
}

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

.page-about .about-rail__cap {
  margin: 0 0 14px;
  padding-left: 12px;
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--line);
}
.page-about .about-rail__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1px;
}
.page-about .about-rail__list a {
  display: flex;
  align-items: baseline;
  gap: 7px;
  padding: 9px 6px 9px 11px;
  border-left: 2px solid transparent;
  font-size: 12px;
  line-height: 1.4;
  color: var(--muted);
  text-decoration: none;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}
.page-about .about-rail__list a span {
  font-size: 10px;
  letter-spacing: .06em;
  color: var(--line);
  transition: color var(--dur) var(--ease);
}
.page-about .about-rail__list a:hover,
.page-about .about-rail__list a:focus-visible {
  color: var(--gold-b);
  border-left-color: var(--gold);
  background: rgba(201, 162, 39, .07);
}
.page-about .about-rail__list a:hover span,
.page-about .about-rail__list a:focus-visible span { color: var(--gold); }

/* ---------- 章节通用 ---------- */
.page-about .about-sec {
  padding: 52px 0;
  border-bottom: 1px solid var(--line);
  scroll-margin-top: calc(var(--header-h) + 20px);
}
.page-about .about-sec:last-of-type { border-bottom: 0; }

.page-about .about-sec__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 24px;
}
.page-about .about-sec__title {
  margin: 0;
  font-size: clamp(20px, 2.5vw, 29px);
  font-weight: 800;
  line-height: 1.26;
  letter-spacing: -.015em;
  color: var(--text);
}
.page-about .about-sec p {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.82;
  color: var(--muted);
}
.page-about .about-sec p:last-child { margin-bottom: 0; }
.page-about .about-sec .about-lead {
  font-size: 17px;
  line-height: 1.82;
  color: var(--text);
}
.page-about .about-sec p a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(43, 227, 199, .35);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.page-about .about-sec p a:hover {
  color: var(--gold-b);
  border-bottom-color: var(--gold);
}

/* ---------- 01 专注方向 ---------- */
.page-about .about-focus { display: grid; gap: 28px; }
.page-about .about-sports {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1px;
  align-content: start;
}
.page-about .about-sports li {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 12px 14px;
  background: rgba(13, 38, 32, .5);
  border-left: 2px solid var(--cyan);
  font-size: 15px;
  color: var(--text);
}
.page-about .about-sports li span {
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--muted);
}

/* ---------- 02 团队 ---------- */
.page-about .about-team { display: grid; gap: 32px; }
.page-about .about-team__fig { margin: 0; }

.page-about .about-bar {
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 15px;
}
.page-about .about-bar__row {
  display: grid;
  grid-template-columns: 76px minmax(0, 1fr) 32px;
  align-items: center;
  gap: 12px;
}
.page-about .about-bar__label {
  font-size: 13px;
  line-height: 1.4;
  color: var(--text);
}
.page-about .about-bar__track {
  position: relative;
  height: 8px;
  background: rgba(27, 68, 56, .55);
  overflow: hidden;
}
.page-about .about-bar__fill {
  display: block;
  height: 100%;
  width: 100%;
  transform: scaleX(0);
  transform-origin: left center;
  background: linear-gradient(90deg, var(--teal), var(--cyan));
  animation: about-bar 700ms var(--ease) forwards;
}
.page-about .about-bar__row:nth-child(1) .about-bar__fill { --w: 1; animation-delay: .05s; }
.page-about .about-bar__row:nth-child(2) .about-bar__fill { --w: .92; animation-delay: .13s; }
.page-about .about-bar__row:nth-child(3) .about-bar__fill { --w: .75; animation-delay: .21s; }
.page-about .about-bar__row:nth-child(4) .about-bar__fill { --w: .17; animation-delay: .29s; }
.page-about .about-bar__num {
  font-size: 14px;
  text-align: right;
  color: var(--gold-b);
}

@keyframes about-bar {
  to { transform: scaleX(var(--w, 1)); }
}

.page-about .about-folds {
  margin-top: 32px;
  display: grid;
  gap: 8px;
}
.page-about .about-folds .fold {
  border: 1px solid var(--line);
  background: rgba(13, 38, 32, .42);
}
.page-about .about-folds .fold__btn {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 15px 16px;
  background: none;
  border: 0;
  cursor: pointer;
  text-align: left;
  font-family: inherit;
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
  transition: background var(--dur) var(--ease);
}
.page-about .about-folds .fold__btn:hover { background: rgba(43, 227, 199, .06); }
.page-about .about-folds .fold__idx {
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--cyan);
}
.page-about .about-folds .fold__title { flex: 1; }
.page-about .about-folds .fold__arrow {
  width: 9px;
  height: 9px;
  border-right: 1px solid var(--muted);
  border-bottom: 1px solid var(--muted);
  transform: rotate(45deg);
  transition: transform var(--dur-slow) var(--ease), border-color var(--dur) var(--ease);
}
.page-about .about-folds .fold[data-open="true"] .fold__arrow {
  transform: rotate(-135deg);
  border-color: var(--gold);
}
.page-about .about-folds .fold__inner { padding: 0 16px 18px; }

.page-about .about-duty {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}
.page-about .about-duty li {
  position: relative;
  padding-left: 16px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}
.page-about .about-duty li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .68em;
  width: 7px;
  height: 1px;
  background: var(--gold);
}

/* ---------- 03 数据来源 ---------- */
.page-about .about-source {
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1px;
}
.page-about .about-source li {
  padding: 22px 20px;
  background: rgba(13, 38, 32, .45);
  border-top: 1px solid var(--line);
}
.page-about .about-source__num {
  display: block;
  margin-bottom: 12px;
  font-size: 28px;
  line-height: 1;
  letter-spacing: -.01em;
  color: var(--gold-b);
}
.page-about .about-source h3 {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--text);
}
.page-about .about-source p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 04 更新节奏 ---------- */
.page-about .about-cadence {
  position: relative;
  margin-top: 30px;
}
.page-about .about-cadence__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 26px;
}
.page-about .about-cadence__item {
  position: relative;
  padding-top: 18px;
}
.page-about .about-cadence__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 7px;
  height: 7px;
  background: var(--gold);
  transform: rotate(45deg);
}
.page-about .about-cadence__item h3 {
  margin: 6px 0 8px;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--text);
}
.page-about .about-cadence__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--muted);
}
.page-about .about-cadence__ver {
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--cyan);
}

/* ---------- 05 版本演进 ---------- */
.page-about .about-tl {
  margin-top: 26px;
  padding-bottom: 150px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}
.page-about .about-tl__track {
  position: relative;
  min-width: 760px;
  margin: 0;
  padding: 22px 0 0;
  list-style: none;
  display: flex;
  border-top: 1px solid var(--line);
}
.page-about .about-tl__node {
  position: relative;
  flex: 1 0 auto;
  width: 108px;
  padding: 18px 12px 0 0;
  outline: none;
}
.page-about .about-tl__node::before {
  content: "";
  position: absolute;
  left: 0;
  top: -27px;
  width: 9px;
  height: 9px;
  background: var(--line);
  transition: background var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.page-about .about-tl__node:hover::before,
.page-about .about-tl__node:focus::before,
.page-about .about-tl__node:focus-visible::before {
  background: var(--gold-b);
  transform: scale(1.35);
}
.page-about .about-tl__ver {
  display: block;
  margin-bottom: 6px;
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--muted);
}
.page-about .about-tl__name {
  display: block;
  font-size: 14px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--text);
}
.page-about .about-tl__tip {
  position: absolute;
  left: 0;
  top: calc(100% + 10px);
  width: 214px;
  padding: 12px 14px;
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-left: 2px solid var(--gold);
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-4px);
  transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease), visibility var(--dur) var(--ease);
  z-index: 4;
}
.page-about .about-tl__node:hover .about-tl__tip,
.page-about .about-tl__node:focus .about-tl__tip,
.page-about .about-tl__node:focus-visible .about-tl__tip {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.page-about .about-tl__fig { margin: 4px 0 0; }

/* ---------- 06 年度报告 ---------- */
.page-about .about-report {
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1px;
}
.page-about .about-report li {
  display: grid;
  gap: 6px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}
.page-about .about-report li:last-child { border-bottom: 0; }
.page-about .about-report__year {
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--gold-b);
}
.page-about .about-report li h3 {
  margin: 0;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--text);
}
.page-about .about-report li p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 07 服务承诺 ---------- */
.page-about .about-commit {
  margin-top: 26px;
  padding: 26px 22px;
}
.page-about .about-commit__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 24px;
}
.page-about .about-commit__num {
  display: block;
  margin-bottom: 8px;
  font-size: 12px;
  letter-spacing: .14em;
  color: #8A6F12;
}
.page-about .about-commit h3 {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--paper-ink);
}
.page-about .about-commit p {
  margin: 0;
  font-size: 14px;
  line-height: 1.76;
  color: #3C5B51;
}
.page-about .about-sec .about-commit p { color: #3C5B51; }

/* ---------- 底部信息带 ---------- */
.page-about .about-close {
  position: relative;
  margin-top: 32px;
  border-top: 1px solid var(--line);
  background: var(--ink-2);
  overflow: hidden;
  isolation: isolate;
}
.page-about .about-close__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .17;
  z-index: -1;
  pointer-events: none;
}
.page-about .about-close__inner {
  position: relative;
  padding: 56px 0;
}
.page-about .about-close h2 {
  margin: 0 0 12px;
  font-size: clamp(20px, 2.6vw, 30px);
  font-weight: 800;
  line-height: 1.28;
  letter-spacing: -.015em;
  color: var(--text);
}
.page-about .about-close p {
  margin: 0 0 22px;
  max-width: 58ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--muted);
}
.page-about .about-close__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 760px) {
  .page-about .about-source { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .page-about .about-source li { padding: 24px 22px 26px; }
  .page-about .about-commit { padding: 30px 28px; }
  .page-about .about-commit__list { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 30px; }

  .page-about .about-cadence {
    padding-top: 26px;
    border-top: 1px solid var(--line);
  }
  .page-about .about-cadence__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 34px;
  }
  .page-about .about-cadence__item { padding-top: 0; }
  .page-about .about-cadence__item::before { top: -30px; }

  .page-about .about-report li {
    grid-template-columns: 92px minmax(0, 1fr) minmax(0, 1.5fr);
    align-items: baseline;
    gap: 6px 22px;
  }
  .page-about .about-report__year { padding-top: 2px; }
}

@media (min-width: 900px) {
  .page-about .about-hero { padding: 36px 0 68px; }
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.18fr) minmax(0, .82fr);
    gap: 48px;
    align-items: end;
  }
  .page-about .about-team {
    grid-template-columns: minmax(0, 1fr) minmax(0, .84fr);
    gap: 42px;
    align-items: start;
  }
  .page-about .about-focus {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, .45fr);
    gap: 44px;
  }
  .page-about .about-sec { padding: 62px 0; }
}

@media (min-width: 1024px) {
  .page-about .about-layout {
    grid-template-columns: var(--idx-w) minmax(0, 1fr);
    column-gap: 44px;
  }
  .page-about .about-rail {
    display: block;
    align-self: start;
    position: sticky;
    top: calc(var(--header-h) + 28px);
    padding: 62px 0 40px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-board__tick {
    animation: none;
    opacity: 1;
  }
  .page-about .about-bar__fill {
    animation: none;
    transform: scaleX(1);
  }
  .page-about .about-tl__tip,
  .page-about .about-folds .fold__arrow,
  .page-about .about-tl__node::before {
    transition: none;
  }
}
</>