.page-about {
  --about-cut: 20px;
  --about-rail-line: rgba(47, 123, 255, .38);
}

.page-about .breadcrumbs {
  padding-top: 18px;
}

/* ---------- 首屏 ---------- */
.page-about .about-cover {
  position: relative;
  overflow: hidden;
}

.page-about .about-cover::before {
  content: "";
  position: absolute;
  inset: -150px -20% auto -20%;
  height: 470px;
  background:
    radial-gradient(55% 100% at 18% 0%, rgba(47, 123, 255, .30), transparent 68%),
    radial-gradient(45% 90% at 88% 12%, rgba(255, 63, 164, .16), transparent 72%);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-cover > .container {
  position: relative;
  z-index: 1;
}

.page-about .about-cover__grid {
  display: grid;
  gap: 28px;
}

.page-about .about-cover__copy h1 {
  margin: 14px 0 18px;
  font-size: clamp(1.85rem, 7vw, 3.5rem);
  line-height: 1.08;
  letter-spacing: -.02em;
  color: var(--ice);
}

.page-about .about-cover__copy .lede {
  max-width: 60ch;
}

.page-about .about-cover__copy .actions {
  margin-top: 26px;
}

.page-about .about-readout {
  padding: 22px;
}

.page-about .about-readout__list {
  margin: 8px 0 0;
  display: grid;
  gap: 0;
}

.page-about .about-readout__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 13px 0;
  border-bottom: 1px solid var(--line);
}

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

.page-about .about-readout__row dt {
  color: var(--silver);
  font-size: .9rem;
}

.page-about .about-readout__row dd {
  margin: 0;
  font-size: 1.02rem;
  color: var(--ice);
}

.page-about .about-readout__row dd.is-live {
  color: var(--mint);
}

/* ---------- 横向年表带 ---------- */
.page-about .about-eras {
  padding-top: 8px;
}

.page-about .about-rail {
  list-style: none;
  margin: 0;
  padding: 10px 2px 24px;
  display: flex;
  gap: 16px;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  scrollbar-width: thin;
}

.page-about .about-rail__item {
  position: relative;
  flex: 0 0 234px;
  scroll-snap-align: start;
  padding: 22px 18px 22px;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: var(--surface-1);
  transition: transform .4s var(--ease), border-color .4s var(--ease), box-shadow .4s var(--ease);
}

.page-about .about-rail__item::before {
  content: "";
  position: absolute;
  top: 0;
  left: 18px;
  right: 18px;
  height: 2px;
  background: linear-gradient(90deg, var(--blue), rgba(122, 92, 255, .35) 60%, transparent);
  transform: scaleX(.42);
  transform-origin: left center;
  transition: transform .5s var(--ease);
}

.page-about .about-rail__item:hover,
.page-about .about-rail__item:focus-within {
  transform: translateY(-6px);
  border-color: rgba(47, 123, 255, .55);
  box-shadow: var(--shadow-island);
}

.page-about .about-rail__item:hover::before,
.page-about .about-rail__item:focus-within::before {
  transform: scaleX(1);
}

.page-about .about-rail__year {
  display: block;
  font-size: 1.22rem;
  color: var(--blue);
  letter-spacing: .04em;
}

.page-about .about-rail__item--now .about-rail__year {
  color: var(--magenta);
}

.page-about .about-rail__item--now::before {
  background: linear-gradient(90deg, var(--magenta), rgba(255, 159, 69, .35) 60%, transparent);
}

.page-about .about-rail__label {
  display: block;
  margin: 10px 0 8px;
  color: var(--ice);
  font-weight: 600;
  letter-spacing: .01em;
}

.page-about .about-rail__text {
  margin: 0;
  color: var(--silver);
  font-size: .92rem;
  line-height: 1.7;
}

/* ---------- 通用图文 ---------- */
.page-about .about-split {
  display: grid;
  gap: 26px;
  margin-top: 24px;
}

.page-about .about-split--tight {
  margin-top: 34px;
}

.page-about .about-figure {
  margin: 0;
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
  background: var(--surface-1);
  box-shadow: var(--shadow-deep);
  overflow: hidden;
}

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

.page-about .about-figure__cap {
  display: block;
  padding: 12px 16px;
  border-top: 1px solid var(--line);
  color: var(--silver);
  font-size: .82rem;
}

.page-about .about-note {
  margin-top: 24px;
  padding: 16px 18px;
  border-left: 2px solid var(--magenta);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  background: linear-gradient(90deg, rgba(255, 63, 164, .12), transparent 72%);
  color: var(--silver);
  font-size: .92rem;
  line-height: 1.75;
}

.page-about .about-note .mono {
  color: var(--magenta);
  margin-right: 8px;
  font-size: .78rem;
  letter-spacing: .12em;
}

/* ---------- 版本与覆盖 ---------- */
.page-about .about-versions {
  display: grid;
  gap: 14px;
  margin-top: 26px;
}

.page-about .about-version {
  position: relative;
  padding: 22px 20px 24px;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: var(--surface-1);
  overflow: hidden;
}

.page-about .about-version::after {
  content: "";
  position: absolute;
  right: -50px;
  bottom: -70px;
  width: 170px;
  height: 170px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(47, 123, 255, .26), transparent 68%);
  pointer-events: none;
}

.page-about .about-version--16::after {
  background: radial-gradient(circle, rgba(79, 224, 176, .22), transparent 68%);
}

.page-about .about-version--17::after {
  background: radial-gradient(circle, rgba(255, 63, 164, .22), transparent 68%);
}

.page-about .about-version__ver {
  margin: 0;
  font-size: 1.32rem;
  color: var(--ice);
  letter-spacing: .04em;
}

.page-about .about-version--16 .about-version__ver {
  color: var(--mint);
}

.page-about .about-version--17 .about-version__ver {
  color: var(--magenta);
}

.page-about .about-version h3 {
  margin: 12px 0 8px;
  font-size: 1.02rem;
  color: var(--ice);
}

.page-about .about-version p {
  position: relative;
  z-index: 1;
  margin: 0;
  color: var(--silver);
  font-size: .93rem;
  line-height: 1.75;
}

.page-about .about-cov {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-cov__item {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 14px;
  padding: 16px 18px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line);
  background: linear-gradient(120deg, rgba(14, 27, 46, .72), rgba(7, 10, 18, .58));
}

.page-about .about-cov__idx {
  color: var(--blue);
  font-size: .92rem;
  letter-spacing: .08em;
}

.page-about .about-cov__item p {
  margin: 0;
  color: var(--silver);
  font-size: .93rem;
  line-height: 1.75;
}

.page-about .about-cov__item strong {
  color: var(--ice);
}

.page-about .about-coverage .actions {
  margin-top: 26px;
}

/* ---------- 安徽支持 ---------- */
.page-about .about-team-nums {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin-top: 24px;
}

.page-about .about-team-nums .stat {
  padding: 16px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line);
  border-bottom: 2px solid rgba(47, 123, 255, .7);
  background: rgba(14, 27, 46, .6);
}

.page-about .about-team-nums .stat__value {
  display: block;
  font-size: 1.7rem;
  color: var(--ice);
  line-height: 1.2;
}

.page-about .about-team-nums .stat__label {
  display: block;
  margin-top: 6px;
  color: var(--silver);
  font-size: .8rem;
  line-height: 1.5;
}

/* ---------- 折叠胶囊 ---------- */
.page-about .about-folds {
  display: grid;
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-fold {
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--surface-1);
  overflow: hidden;
  transition: border-color .35s var(--ease);
}

.page-about .about-fold[open] {
  border-color: rgba(47, 123, 255, .45);
}

.page-about .about-fold__summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
  color: var(--ice);
  font-weight: 600;
}

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

.page-about .about-fold__summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 1.1rem;
  color: var(--blue);
  transition: transform .3s var(--ease);
}

.page-about .about-fold[open] .about-fold__summary::after {
  content: "–";
  color: var(--magenta);
}

.page-about .about-fold__idx {
  color: var(--violet);
  font-size: .84rem;
  letter-spacing: .08em;
}

.page-about .about-fold__title {
  font-size: 1rem;
}

.page-about .about-fold__body {
  padding: 0 18px 18px;
}

.page-about .about-fold__body p {
  margin: 0;
  color: var(--silver);
  font-size: .93rem;
  line-height: 1.8;
}

/* ---------- 荣誉 ---------- */
.page-about .about-honors {
  margin-top: 26px;
}

.page-about .about-honor {
  padding: 24px 22px 26px;
  background: var(--surface-2);
  border: 1px solid var(--line-strong);
  clip-path: polygon(0 0, calc(100% - var(--about-cut)) 0, 100% var(--about-cut), 100% 100%, 0 100%);
}

.page-about .about-honor h3 {
  margin: 14px 0 10px;
  font-size: 1.06rem;
  color: var(--ice);
}

.page-about .about-honor p {
  margin: 0;
  color: var(--silver);
  font-size: .93rem;
  line-height: 1.78;
}

/* ---------- 服务原则收束 ---------- */
.page-about .about-principles .about-folds--principles {
  margin-top: 24px;
}

.page-about .about-reach {
  padding: 24px 22px 26px;
}

.page-about .about-reach h3 {
  margin: 12px 0 16px;
  font-size: 1.08rem;
  color: var(--ice);
}

.page-about .about-reach__list {
  list-style: none;
  margin: 0 0 22px;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-reach__list li {
  display: grid;
  gap: 4px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-reach__list li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .about-reach__key {
  color: var(--silver);
  font-size: .82rem;
  letter-spacing: .04em;
}

.page-about .about-reach__val {
  color: var(--ice);
  font-size: .95rem;
  line-height: 1.6;
  text-decoration: none;
  overflow-wrap: anywhere;
}

a.about-reach__val:hover {
  color: var(--blue);
}

/* ---------- 响应式 ---------- */
@media (min-width: 760px) {
  .page-about .about-cover__grid {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    align-items: start;
    gap: 36px;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, .88fr);
    align-items: center;
    gap: 36px;
  }

  .page-about .about-split--reverse > .about-figure {
    order: 2;
  }

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

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

  .page-about .about-rail__item {
    flex-basis: 252px;
  }
}

@media (min-width: 1080px) {
  .page-about .about-cover__copy h1 {
    max-width: 22ch;
  }

  .page-about .about-rail {
    padding-bottom: 30px;
  }

  .page-about .about-rail__item {
    flex-basis: 266px;
  }

  .page-about .about-team-nums .stat__value {
    font-size: 2rem;
  }
}

@media (max-width: 420px) {
  .page-about .about-team-nums {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-about .about-cov__item {
    grid-template-columns: minmax(0, 1fr);
    gap: 6px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail__item,
  .page-about .about-rail__item::before,
  .page-about .about-fold,
  .page-about .about-fold__summary::after {
    transition: none;
  }

  .page-about .about-rail__item:hover,
  .page-about .about-rail__item:focus-within {
    transform: none;
  }

  .page-about .about-rail__item::before {
    transform: scaleX(1);
  }
}