.page-about {
  display: block;
  --about-gap: clamp(20px, 3vw, 36px);
}

/* ---------- 索引头 ---------- */
.page-about .about-head {
  position: relative;
  padding: clamp(26px, 5vw, 60px) 0 clamp(22px, 4vw, 40px);
}
.page-about .about-head::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(760px 380px at 84% -12%, rgba(0, 229, 160, .16), transparent 64%),
    repeating-linear-gradient(180deg, rgba(242, 245, 247, .025) 0 1px, transparent 1px 46px);
}
.page-about .about-head > .wrap { position: relative; }
.page-about .about-head .breadcrumb { margin: 0 0 22px; }
.page-about .about-head__title {
  margin: 12px 0 16px;
  font-family: var(--font-head);
  font-size: clamp(31px, 6.4vw, 74px);
  font-weight: 800;
  line-height: 1.06;
  letter-spacing: -.02em;
  color: var(--ink);
  max-width: 18ch;
}
.page-about .about-head__lede {
  max-width: 64ch;
  margin: 0;
  color: var(--ink-body);
  font-size: clamp(15.5px, 1.6vw, 18px);
  line-height: 1.8;
}
.page-about .about-head__lede strong { color: var(--white); font-weight: 700; }

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 32px 0 0;
  padding: 0;
  list-style: none;
  background: var(--hair);
  border: 1px solid var(--hair);
}
.page-about .about-facts__item {
  background: var(--panel);
  padding: 15px 16px 17px;
}
.page-about .about-facts__num {
  display: block;
  font-family: var(--font-num);
  font-size: clamp(21px, 3vw, 30px);
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--brand);
  font-variant-numeric: tabular-nums;
}
.page-about .about-facts__label {
  display: block;
  margin-top: 7px;
  font-size: 12.5px;
  letter-spacing: .04em;
  color: var(--ink-2);
}

/* ---------- 主体网格 ---------- */
.page-about .about-body {
  padding: clamp(28px, 5vw, 54px) 0 clamp(40px, 6vw, 84px);
  row-gap: 28px;
  column-gap: var(--about-gap);
}

/* ---------- 章节 ---------- */
.page-about .about-section { scroll-margin-top: calc(var(--header-h) + 22px); }
.page-about .about-section + .about-section {
  margin-top: clamp(30px, 4vw, 50px);
  padding-top: clamp(26px, 3.4vw, 40px);
  border-top: 1px solid var(--hair);
}
.page-about .about-section .section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 18px;
  margin: 0 0 18px;
}
.page-about .about-section .section-head h2 {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin: 0;
  font-family: var(--font-head);
  font-size: clamp(21px, 2.9vw, 33px);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -.01em;
  color: var(--ink);
}
.page-about .about-secnum {
  font-size: .54em;
  font-weight: 700;
  letter-spacing: .06em;
  color: var(--brand);
  border-bottom: 1px solid rgba(0, 229, 160, .45);
  padding-bottom: 2px;
}
.page-about .about-section .section-head__note {
  margin: 0;
  font-family: var(--font-num);
  font-size: 11.5px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--muted);
}
.page-about .prose p {
  margin: 0 0 15px;
  color: var(--ink-body);
  font-size: 16px;
  line-height: 1.8;
}
.page-about .prose p:last-child { margin-bottom: 0; }
.page-about .prose a {
  color: var(--brand);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 229, 160, .4);
  transition: border-color 160ms var(--ease), color 160ms var(--ease);
}
.page-about .prose a:hover { color: var(--white); border-bottom-color: var(--white); }

/* ---------- 图片容器 ---------- */
.page-about .media-frame img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .about-cover { margin: 0 0 24px; }
.page-about .about-cover__cap,
.page-about .about-teamimg__cap,
.page-about .about-covimg__cap {
  margin-top: 9px;
  font-family: var(--font-num);
  font-size: 11.5px;
  letter-spacing: .1em;
  color: var(--muted);
}

/* ---------- 时间轴 ---------- */
.page-about .about-tl {
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about .about-tl__item {
  position: relative;
  padding: 0 0 18px 34px;
}
.page-about .about-tl__item::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 22px;
  bottom: 0;
  width: 1px;
  background: var(--hair);
}
.page-about .about-tl__item:last-child { padding-bottom: 0; }
.page-about .about-tl__item:last-child::before { display: none; }
.page-about .about-tl__dot {
  position: absolute;
  left: 0;
  top: 12px;
  width: 19px;
  height: 19px;
  border-radius: 50%;
  border: 1px solid var(--brand-deep);
  background: var(--bg);
  display: flex;
  align-items: center;
  justify-content: center;
}
.page-about .about-tl__dot::after {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--brand);
}
.page-about .about-tl__card {
  display: block;
  padding: 15px 18px 17px;
  background: var(--panel);
  border: 1px solid var(--hair);
  clip-path: polygon(0 0, calc(100% - 16px) 0, 100% 16px, 100% 100%, 0 100%);
  box-shadow: var(--shadow-soft);
  transition:
    transform 160ms var(--ease),
    border-color 160ms var(--ease),
    background-color 160ms var(--ease);
}
.page-about .about-tl__card:hover,
.page-about .about-tl__card:focus { transform: translateY(-2px); border-color: var(--brand); }
.page-about .about-tl__card:focus-visible { outline: 2px solid var(--brand); outline-offset: 2px; }
.page-about .about-tl__card:hover .about-tl__ver,
.page-about .about-tl__card:focus .about-tl__ver { color: var(--accent); border-color: rgba(255, 107, 53, .5); }
.page-about .about-tl__ver {
  display: inline-block;
  margin: 0 0 10px;
  padding: 2px 9px;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--brand);
  border: 1px solid rgba(0, 229, 160, .38);
  border-radius: 2px;
  transition: color 160ms var(--ease), border-color 160ms var(--ease);
}
.page-about .about-tl__title {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 600;
  line-height: 1.45;
  color: var(--ink);
}
.page-about .about-tl__text {
  margin: 0;
  color: var(--ink-body);
  font-size: 15px;
  line-height: 1.78;
}
.page-about .about-tl__badge {
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  margin: 0;
  padding: 0;
  border-top: 1px dashed transparent;
  font-family: var(--font-num);
  font-size: 11.5px;
  letter-spacing: .08em;
  color: var(--ink-2);
  transition:
    max-height 240ms var(--ease),
    opacity 180ms var(--ease),
    margin 240ms var(--ease),
    padding 240ms var(--ease),
    border-color 240ms var(--ease);
}
.page-about .about-tl__card:hover .about-tl__badge,
.page-about .about-tl__card:focus .about-tl__badge {
  max-height: 80px;
  opacity: 1;
  margin-top: 12px;
  padding-top: 10px;
  border-top-color: var(--hair);
}

/* ---------- 数据条 ---------- */
.page-about .about-bars {
  list-style: none;
  margin: 20px 0 20px;
  padding: 0;
  border-top: 1px solid var(--hair);
}
.page-about .about-bars__row {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: baseline;
  gap: 4px 16px;
  padding: 12px 0;
  border-bottom: 1px solid var(--hair);
}
.page-about .about-bars__label {
  color: var(--ink-2);
  font-size: 14.5px;
  line-height: 1.6;
}
.page-about .about-bars__value {
  font-family: var(--font-num);
  font-size: 15.5px;
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}
.page-about .about-bars__row:first-child .about-bars__value { color: var(--brand); }

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: 22px;
}
.page-about .about-teamimg { margin: 0; }
.page-about .about-team__roles { display: grid; gap: 0; }
.page-about .about-role {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr);
  gap: 4px 12px;
  padding: 14px 0;
  border-bottom: 1px solid var(--hair);
}
.page-about .about-role:first-child { border-top: 1px solid var(--hair); }
.page-about .about-role__num {
  font-family: var(--font-num);
  font-size: 25px;
  font-weight: 700;
  line-height: 1.1;
  color: var(--brand);
  font-variant-numeric: tabular-nums;
}
.page-about .about-role__name {
  align-self: center;
  font-size: 15.5px;
  font-weight: 600;
  color: var(--ink);
}
.page-about .about-role__desc {
  grid-column: 2;
  margin: 0;
  color: var(--ink-2);
  font-size: 14px;
  line-height: 1.75;
}

/* ---------- 资质列表 ---------- */
.page-about .about-list {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  border-top: 1px solid var(--hair);
}
.page-about .about-list__item {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 4px 14px;
  padding: 15px 0;
  border-bottom: 1px solid var(--hair);
}
.page-about .about-list__num {
  font-family: var(--font-num);
  font-size: 12.5px;
  letter-spacing: .1em;
  color: var(--brand);
  padding-top: 4px;
}
.page-about .about-list__title {
  margin: 0;
  font-family: var(--font-head);
  font-size: 16.5px;
  font-weight: 600;
  color: var(--ink);
}
.page-about .about-list__desc {
  grid-column: 2;
  margin: 0;
  color: var(--ink-2);
  font-size: 14.5px;
  line-height: 1.75;
}

/* ---------- 服务覆盖 ---------- */
.page-about .about-reach { display: grid; gap: 20px; }
.page-about .about-reach__text { order: 2; }
.page-about .about-covimg { order: 1; margin: 0; }
.page-about .about-matrix {
  height: 84px;
  margin-top: 20px;
  border: 1px solid var(--hair);
  background-color: rgba(17, 21, 30, .6);
  background-image:
    radial-gradient(circle, rgba(0, 229, 160, .55) 1.5px, transparent 1.6px),
    radial-gradient(circle, rgba(152, 164, 179, .28) 1.4px, transparent 1.5px);
  background-size: 22px 22px, 22px 22px;
  background-position: 0 0, 11px 11px;
  opacity: .8;
}

/* ---------- 联络 ---------- */
.page-about .about-contacts {
  display: grid;
  gap: 1px;
  margin: 20px 0 0;
  padding: 1px;
  list-style: none;
  background: var(--hair);
  border: 1px solid var(--hair);
}
.page-about .about-contacts .contact-list__item {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 14px;
  padding: 14px 16px;
  background: var(--panel);
}
.page-about .about-contacts .contact-list__label {
  font-size: 12.5px;
  letter-spacing: .06em;
  color: var(--ink-2);
  min-width: 68px;
}
.page-about .about-contacts .contact-list__value {
  flex: 1 1 auto;
  font-family: var(--font-num);
  font-size: 14.5px;
  color: var(--ink);
  word-break: break-all;
}
.page-about .about-contacts .copy-btn {
  padding: 5px 12px;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--ink-2);
  background: transparent;
  border: 1px solid var(--hair);
  border-radius: 2px;
  cursor: pointer;
  transition: color 160ms var(--ease), border-color 160ms var(--ease), background-color 160ms var(--ease);
}
.page-about .about-contacts .copy-btn:hover,
.page-about .about-contacts .copy-btn:focus-visible {
  color: var(--brand);
  border-color: var(--brand);
  outline: none;
}
.page-about .about-contacts .copy-btn[data-copied] {
  color: var(--accent);
  border-color: var(--accent);
  background: rgba(255, 107, 53, .08);
}
.page-about .about-contacts__note {
  margin: 16px 0 0;
  color: var(--ink-2);
  font-size: 14.5px;
  line-height: 1.75;
}
.page-about .about-contacts__note a {
  color: var(--brand);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 229, 160, .4);
}
.page-about .about-contacts__note a:hover { color: var(--white); border-bottom-color: var(--white); }

/* ---------- 收尾索引行 ---------- */
.page-about .about-end {
  margin-top: clamp(34px, 5vw, 58px);
  padding-top: 22px;
  border-top: 1px solid var(--hair);
}
.page-about .about-end__title {
  margin: 0 0 14px;
  color: var(--muted);
  font-family: var(--font-num);
  font-size: 11.5px;
  letter-spacing: .18em;
}
.page-about .about-end__links {
  display: grid;
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--hair);
  border: 1px solid var(--hair);
}
.page-about .about-end__link {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 4px 14px;
  padding: 15px 16px;
  background: var(--panel);
  text-decoration: none;
  transition: background-color 160ms var(--ease), color 160ms var(--ease);
}
.page-about .about-end__link:hover,
.page-about .about-end__link:focus-visible {
  background: var(--mist);
  outline: none;
}
.page-about .about-end__link:hover .about-end__k,
.page-about .about-end__link:focus-visible .about-end__k { color: var(--brand); }
.page-about .about-end__k {
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
  transition: color 160ms var(--ease);
}
.page-about .about-end__v {
  font-family: var(--font-num);
  font-size: 11.5px;
  letter-spacing: .1em;
  color: var(--ink-2);
}

/* ---------- 侧栏坐标索引 ---------- */
.page-about .about-rail {
  order: -1;
  padding: 12px 0;
  border-top: 1px solid var(--hair);
  border-bottom: 1px solid var(--hair);
}
.page-about .about-rail .rail__title {
  margin: 0 0 10px;
  font-family: var(--font-num);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--muted);
}
.page-about .about-rail .rail__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 2px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}
.page-about .about-rail .rail__list::-webkit-scrollbar { display: none; }
.page-about .about-rail .rail__item { flex: 0 0 auto; }
.page-about .about-rail .rail__link {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 7px 11px;
  white-space: nowrap;
  font-size: 12.5px;
  color: var(--ink-2);
  text-decoration: none;
  border: 1px solid var(--hair);
  background: var(--panel);
  transition: color 160ms var(--ease), border-color 160ms var(--ease), background-color 160ms var(--ease);
}
.page-about .about-rail .rail__link .num { color: var(--muted); font-size: 11px; letter-spacing: .06em; }
.page-about .about-rail .rail__link:hover,
.page-about .about-rail .rail__link:focus-visible {
  color: var(--brand);
  border-color: var(--brand);
  outline: none;
}
.page-about .about-rail .rail__link[aria-current="true"],
.page-about .about-rail .rail__link[aria-current="location"] {
  color: var(--brand);
  background: var(--mist);
  border-color: var(--brand-deep);
}
.page-about .about-rail .rail__link[aria-current="true"] .num,
.page-about .about-rail .rail__link[aria-current="location"] .num { color: var(--accent); }

/* ---------- 中等屏幕 ---------- */
@media (min-width: 720px) {
  .page-about .about-facts { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .page-about .about-kicker-row { display: block; }
  .page-about .about-end__links { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .page-about .about-team { grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr); align-items: start; gap: 26px; }
  .page-about .about-tl__item { padding-left: 42px; }
  .page-about .about-tl__item::before { left: 11px; }
  .page-about .about-tl__dot { width: 23px; height: 23px; left: 0; }
  .page-about .about-tl__dot::after { width: 7px; height: 7px; }
}

/* ---------- 桌面：右侧 sticky 坐标索引 ---------- */
@media (min-width: 960px) {
  .page-about .about-rail {
    order: 0;
    position: sticky;
    top: calc(var(--header-h) + 28px);
    align-self: start;
    padding: 4px 0 4px 20px;
    border-top: 0;
    border-bottom: 0;
    border-left: 1px solid var(--hair);
  }
  .page-about .about-rail .rail__title { margin-bottom: 14px; }
  .page-about .about-rail .rail__list {
    display: block;
    overflow: visible;
    padding: 0;
  }
  .page-about .about-rail .rail__item { display: block; }
  .page-about .about-rail .rail__link {
    display: flex;
    justify-content: flex-start;
    gap: 10px;
    width: 100%;
    padding: 9px 0;
    white-space: normal;
    font-size: 13px;
    line-height: 1.5;
    border: 0;
    border-bottom: 1px solid var(--hair);
    background: transparent;
  }
  .page-about .about-rail .rail__link:hover { background: transparent; }
  .page-about .about-rail .rail__link[aria-current="true"],
  .page-about .about-rail .rail__link[aria-current="location"] { background: transparent; border-color: var(--brand-deep); }
  .page-about .about-reach { grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr); align-items: start; gap: 30px; }
  .page-about .about-reach__text { order: 1; }
  .page-about .about-covimg { order: 2; }
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-tl__card,
  .page-about .about-tl__badge,
  .page-about .about-tl__ver,
  .page-about .about-end__link,
  .page-about .about-end__k,
  .page-about .about-rail .rail__link,
  .page-about .about-contacts .copy-btn,
  .page-about .prose a {
    transition: none;
  }
  .page-about .about-tl__card:hover,
  .page-about .about-tl__card:focus { transform: none; }
}