.page-about {
  --about-rail-w: 220px;
  --about-quote-tint: rgba(31, 121, 183, .62);
  background: var(--paper);
  color: var(--ink);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: 34px 0 30px;
  background:
    linear-gradient(180deg, var(--lake-tint) 0%, rgba(238, 245, 251, 0) 90%),
    var(--paper);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-crumbs {
  margin-bottom: 26px;
  font-size: 13px;
}

.page-about .about-crumbs a {
  color: var(--lake);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--t-fast) var(--ease);
}

.page-about .about-crumbs a:hover,
.page-about .about-crumbs a:focus-visible {
  border-bottom-color: currentColor;
}

.page-about .about-hero__grid {
  display: grid;
  gap: 30px;
}

.page-about .about-hero__eyebrow {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--lake);
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: .01em;
  font-size: clamp(28px, 6.4vw, 54px);
  line-height: 1.16;
  margin: 0 0 18px;
  color: var(--lake-deep);
  max-width: 14em;
}

.page-about .about-hero__lede {
  margin: 0;
  font-size: 17px;
  line-height: 1.78;
  color: var(--ink-soft);
  max-width: 36em;
}

.page-about .about-hero__stamp {
  margin: 22px 0 0;
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--mist);
}

.page-about .about-hero__aside {
  border-top: 2px solid var(--lake);
  padding-top: 6px;
}

.page-about .hero-facts {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .hero-facts li {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 14px;
  padding: 11px 0;
  border-bottom: 1px solid var(--line-soft);
  font-size: 14px;
}

.page-about .hero-facts__k {
  flex: 0 0 auto;
  font-size: 12px;
  color: var(--mist);
}

.page-about .hero-facts__v {
  text-align: right;
  color: var(--ink);
  line-height: 1.55;
}

.page-about .about-map {
  display: flex;
  gap: 8px;
  margin-top: 34px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

.page-about .about-map::-webkit-scrollbar {
  display: none;
}

.page-about .about-map__link {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.4;
  color: var(--ink-soft);
  text-decoration: none;
  padding: 7px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--white);
  transition:
    color var(--t-fast) var(--ease),
    border-color var(--t-fast) var(--ease),
    background var(--t-fast) var(--ease);
}

.page-about .about-map__link:hover,
.page-about .about-map__link:focus-visible {
  color: var(--lake-deep);
  border-color: var(--lake);
  background: var(--lake-soft);
  outline: none;
}

/* ---------- 章节骨架 ---------- */
.page-about .about-section {
  padding: 52px 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-section--tint {
  background: linear-gradient(180deg, rgba(220, 235, 246, .55) 0%, rgba(220, 235, 246, 0) 78%);
}

.page-about .about-row {
  display: grid;
  gap: 22px;
}

.page-about .about-rail__num {
  display: block;
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--lake);
  margin-bottom: 8px;
}

.page-about .about-rail__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 20px;
  line-height: 1.42;
  letter-spacing: .01em;
  color: var(--lake-deep);
  margin: 0;
  max-width: 8em;
}

.page-about .about-body {
  max-width: 68ch;
}

.page-about .about-body p {
  margin: 0 0 1.2em;
  font-size: 16.5px;
  line-height: 1.8;
  color: var(--ink-soft);
}

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

.page-about .about-body .about-body__lead {
  font-size: 19px;
  line-height: 1.72;
  font-weight: 500;
  color: var(--ink);
}

.page-about .about-body a {
  color: var(--lake);
  text-decoration: none;
  border-bottom: 1px solid rgba(31, 121, 183, .35);
  transition: border-color var(--t-fast) var(--ease), color var(--t-fast) var(--ease);
}

.page-about .about-body a:hover,
.page-about .about-body a:focus-visible {
  color: var(--lake-deep);
  border-bottom-color: var(--lake-deep);
}

/* ---------- 主张引句 ---------- */
.page-about .about-quote {
  margin: 30px 0;
  padding: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 4.6vw, 38px);
  line-height: 1.32;
  letter-spacing: .02em;
  color: var(--about-quote-tint);
}

.page-about .about-quote::before {
  content: "";
  display: block;
  width: 48px;
  height: 2px;
  background: var(--gold);
  margin-bottom: 18px;
}

/* ---------- 折叠与列表 ---------- */
.page-about .about-fold {
  margin-top: 28px;
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  background: var(--white);
  overflow: hidden;
}

.page-about .about-fold__sum {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 18px;
  cursor: pointer;
  list-style: none;
  font-size: 15px;
  font-weight: 600;
  color: var(--lake-deep);
  transition: background var(--t-fast) var(--ease);
}

.page-about .about-fold__sum::-webkit-details-marker {
  display: none;
}

.page-about .about-fold__sum::before {
  content: "+";
  font-family: var(--font-mono);
  font-size: 16px;
  line-height: 1;
  color: var(--lake);
}

.page-about .about-fold[open] .about-fold__sum::before {
  content: "–";
}

.page-about .about-fold[open] .about-fold__sum {
  background: var(--lake-tint);
}

.page-about .about-fold__body {
  padding: 4px 18px 16px;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-fold__body p {
  margin: 12px 0 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .about-list {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
}

.page-about .about-list li {
  padding: 13px 0;
  border-bottom: 1px dashed var(--line-soft);
  font-size: 15px;
  line-height: 1.72;
  color: var(--ink-soft);
}

.page-about .about-list li:last-child {
  border-bottom: none;
}

.page-about .about-list .mono {
  display: block;
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--lake-deep);
  margin-bottom: 5px;
}

.page-about .about-list--roomy {
  margin-top: 28px;
}

.page-about .about-list--roomy li {
  border-bottom: 1px solid var(--line-soft);
  padding: 15px 0;
}

/* ---------- 时间轴 ---------- */
.page-about .about-texture {
  position: relative;
  margin: 26px 0 34px;
  border-radius: var(--radius-m);
  overflow: hidden;
  background: var(--lake-soft);
}

.page-about .about-texture img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: clamp(130px, 20vw, 190px);
  object-fit: cover;
}

.page-about .about-texture::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(
    90deg,
    rgba(247, 248, 246, .78) 0%,
    rgba(247, 248, 246, .18) 46%,
    rgba(231, 240, 231, .62) 100%
  );
  pointer-events: none;
}

.page-about .about-texture__cap {
  position: relative;
  z-index: 1;
  margin: 0;
  padding: 12px 16px 14px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--ink-soft);
  background: var(--white);
  border-top: 1px solid var(--line-soft);
}

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

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 12px;
  bottom: 18px;
  width: 1px;
  background: linear-gradient(180deg, var(--lake) 0%, var(--grass) 100%);
  opacity: .45;
}

.page-about .tl-item {
  position: relative;
  padding-left: 30px;
  padding-bottom: 14px;
}

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

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 15px;
  width: 11px;
  height: 11px;
  box-sizing: border-box;
  border-radius: 50%;
  background: var(--white);
  border: 2px solid var(--lake);
}

.page-about .tl-item--current::before {
  background: var(--gold);
  border-color: var(--gold);
  box-shadow: 0 0 0 4px rgba(217, 166, 60, .2);
}

.page-about .tl-card {
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-m);
  background: var(--white);
  transition: border-color var(--t-fast) var(--ease);
}

.page-about .tl-card:hover {
  border-color: var(--line);
}

.page-about .tl-card[open] {
  border-color: rgba(31, 121, 183, .34);
}

.page-about .tl-card__head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 12px;
  padding: 13px 16px;
  cursor: pointer;
  list-style: none;
}

.page-about .tl-card__head::-webkit-details-marker {
  display: none;
}

.page-about .tl-card__ver {
  flex: 0 0 auto;
  font-size: 12px;
  line-height: 1.5;
  padding: 2px 8px;
  border-radius: 4px;
  background: var(--lake-deep);
  color: var(--white);
  letter-spacing: .04em;
}

.page-about .tl-item--current .tl-card__ver {
  background: var(--gold);
  color: var(--ink);
}

.page-about .tl-card__name {
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
  line-height: 1.5;
}

.page-about .tl-card__body {
  padding: 0 16px 15px;
  border-top: 1px solid var(--line-soft);
  margin-top: 2px;
  padding-top: 12px;
}

.page-about .tl-card__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink-soft);
}

/* ---------- 团队 ---------- */
.page-about .about-figure {
  margin: 26px 0 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius-m);
  background: var(--lake-soft);
}

.page-about .about-figure__cap {
  margin: 10px 0 0;
  font-size: 12px;
  line-height: 1.6;
  color: var(--mist);
}

.page-about .tm {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  gap: 20px;
}

.page-about .tm-role__top {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 9px;
}

.page-about .tm-role__name {
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
}

.page-about .tm-role__num {
  font-size: 12px;
  color: var(--lake-deep);
}

.page-about .tm-role__track {
  height: 8px;
  border-radius: 999px;
  background: var(--lake-tint);
  overflow: hidden;
}

.page-about .tm-role__bar {
  display: block;
  height: 100%;
  border-radius: 999px;
  transition: filter var(--t-fast) var(--ease);
}

.page-about .tm-role:hover .tm-role__bar {
  filter: saturate(1.25) brightness(1.04);
}

.page-about .tm-role__bar--ops {
  width: 31.8%;
  background: var(--grass);
}

.page-about .tm-role__bar--eng {
  width: 40.9%;
  background: var(--lake-deep);
}

.page-about .tm-role__bar--dsc {
  width: 13.6%;
  background: var(--gold);
}

.page-about .tm-role__bar--srv {
  width: 13.6%;
  background: var(--lake);
}

.page-about .tm-role__note {
  margin: 9px 0 0;
  font-size: 13.5px;
  line-height: 1.68;
  color: var(--mist);
  transition: color var(--t-fast) var(--ease);
}

.page-about .tm-role:hover .tm-role__note,
.page-about .tm-role:focus-within .tm-role__note {
  color: var(--ink-soft);
}

/* ---------- 一周节奏 ---------- */
.page-about .week {
  list-style: none;
  margin: 26px 0 8px;
  padding: 0;
  display: flex;
  gap: 5px;
}

.page-about .week__day {
  flex: 1 1 0;
  min-width: 0;
  text-align: center;
  padding: 11px 2px;
  border-radius: var(--radius-s);
  background: var(--white);
  border: 1px solid var(--line-soft);
}

.page-about .week__day .mono {
  display: block;
  font-size: 11px;
  letter-spacing: .02em;
  color: var(--mist);
  white-space: nowrap;
}

.page-about .week__day--key {
  background: var(--lake-deep);
  border-color: var(--lake-deep);
}

.page-about .week__day--key .mono {
  color: var(--gold);
}

/* ---------- 登记信息 ---------- */
.page-about .about-figure--wide img {
  border-radius: var(--radius-m);
}

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

.page-about .reg-list li {
  display: grid;
  grid-template-columns: 1fr;
  gap: 5px;
  padding: 15px 0;
  border-top: 1px solid var(--line-soft);
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink-soft);
}

.page-about .reg-list li:last-child {
  border-bottom: 1px solid var(--line-soft);
}

.page-about .reg-list__k {
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--mist);
}

/* ---------- 桌面非对称栅格 ---------- */
@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 48px 0 40px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: 0 24px;
    align-items: end;
  }

  .page-about .about-hero__main {
    grid-column: 1 / span 7;
  }

  .page-about .about-hero__aside {
    grid-column: 9 / span 4;
  }

  .page-about .about-section {
    padding: 76px 0;
  }

  .page-about .about-row {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: 0 56px;
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 92px;
  }

  .page-about .about-rail__title {
    font-size: 21px;
  }

  .page-about .about-quote {
    margin: 36px 0;
  }

  .page-about .tl-item {
    padding-left: 36px;
    padding-bottom: 16px;
  }

  .page-about .reg-list li {
    grid-template-columns: 140px minmax(0, 1fr);
    gap: 24px;
    align-items: baseline;
  }
}

@media (min-width: 1200px) {
  .page-about .about-hero__main {
    grid-column: 1 / span 6;
  }

  .page-about .about-hero__aside {
    grid-column: 8 / span 5;
  }
}

/* ---------- 减少动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-map__link,
  .page-about .about-fold__sum,
  .page-about .tl-card,
  .page-about .tm-role__bar,
  .page-about .tm-role__note,
  .page-about .about-body a,
  .page-about .about-crumbs a {
    transition-duration: 0ms;
  }
}