.page-about {
  --about-indent: 26px;
  --about-card-line: rgba(143, 163, 200, .20);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: 56px 0 34px;
  background:
    radial-gradient(120% 92% at 6% -10%, rgba(34, 211, 238, .16), transparent 58%),
    radial-gradient(96% 84% at 94% 6%, rgba(124, 92, 255, .24), transparent 62%);
}

.page-about .about-hero h1 {
  font-family: var(--font-heading);
  font-size: 30px;
  line-height: 1.28;
  letter-spacing: .02em;
  color: var(--snow);
  margin: 14px 0 18px;
  max-width: 20em;
}

.page-about .about-hero .lead {
  max-width: 46em;
  color: var(--mist);
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 34px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 20px;
}

.page-about .about-hero__fact {
  border-left: 2px solid var(--line-strong);
  padding-left: 14px;
  min-width: 0;
}

.page-about .about-hero__fact .mono {
  display: block;
  font-family: var(--font-mono);
  font-size: 24px;
  line-height: 1.1;
  letter-spacing: .08em;
  color: var(--cyan);
  margin-bottom: 6px;
}

.page-about .about-hero__fact span:last-child {
  display: block;
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline__list {
  list-style: none;
  margin: 0;
  padding: 6px 0 6px var(--about-indent);
  position: relative;
}

.page-about .about-timeline__list::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 14px;
  bottom: 14px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--cyan) 0%, var(--purple) 58%, rgba(124, 92, 255, 0) 100%);
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 34px;
}

.page-about .about-timeline__item:last-child {
  padding-bottom: 6px;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: calc(-1 * var(--about-indent));
  top: 7px;
  width: 14px;
  height: 14px;
  border-radius: 4px;
  background: var(--blue-night);
  border: 2px solid var(--cyan);
  box-shadow: 0 0 0 4px rgba(34, 211, 238, .12);
  transition: box-shadow .18s var(--ease);
}

.page-about .about-timeline__item:hover::before {
  box-shadow: 0 0 0 7px rgba(34, 211, 238, .2);
}

.page-about .about-timeline__year {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 17px;
  letter-spacing: .08em;
  color: var(--cyan-light);
  margin-bottom: 8px;
}

.page-about .about-timeline__item h3 {
  font-family: var(--font-heading);
  font-size: 18px;
  line-height: 1.4;
  color: var(--snow);
  margin: 0 0 8px;
}

.page-about .about-timeline__item p {
  margin: 0;
  color: var(--mist);
  font-size: 15px;
  line-height: 1.75;
  max-width: 42em;
}

/* ---------- 图片容器 ---------- */
.page-about .about-figure {
  margin: 30px 0 0;
  border-radius: var(--radius-md);
  border: 1px solid var(--line-strong);
  background: linear-gradient(150deg, rgba(18, 42, 85, .9), rgba(11, 27, 58, .95));
  padding: 10px;
}

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

.page-about .about-figure .media__caption {
  display: block;
  padding: 12px 6px 6px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

.page-about .about-team__card {
  position: relative;
  border: 1px solid var(--about-card-line);
  border-radius: var(--radius-md);
  background: linear-gradient(158deg, rgba(18, 42, 85, .92), rgba(11, 27, 58, .94));
  padding: 20px;
  transition: transform .18s var(--ease), border-color .18s var(--ease), box-shadow .18s var(--ease);
}

.page-about .about-team__card:nth-child(2) {
  border-radius: var(--radius-lg);
}

.page-about .about-team__card:nth-child(3) {
  border-radius: var(--radius-sm);
}

.page-about .about-team__card:hover,
.page-about .about-team__card[open] {
  transform: translateY(-4px);
  border-color: var(--line-strong);
  box-shadow: var(--shadow-card);
}

.page-about .about-team__card > summary {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 8px 10px;
  cursor: pointer;
  list-style: none;
}

.page-about .about-team__card > summary::-webkit-details-marker {
  display: none;
}

.page-about .about-team__card > summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-team__card[open] > summary::after {
  content: "–";
}

.page-about .about-team__num {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--ink);
  background: linear-gradient(120deg, var(--cyan), var(--purple));
  border-radius: 6px;
  padding: 2px 8px;
}

.page-about .about-team__name {
  font-family: var(--font-heading);
  font-size: 19px;
  line-height: 1.3;
  color: var(--snow);
}

.page-about .about-team__meta {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--mist);
}

.page-about .about-team__detail {
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px solid var(--about-card-line);
}

.page-about .about-team__detail p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .about-team__flow {
  margin: 26px 0 0;
  padding: 18px 20px;
  border-left: 3px solid var(--purple);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  background: linear-gradient(90deg, rgba(124, 92, 255, .14), rgba(124, 92, 255, 0) 82%);
  color: var(--snow);
  font-size: 15px;
  line-height: 1.75;
}

/* ---------- 覆盖范围 ---------- */
.page-about .about-coverage__chips {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-coverage__chip {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--mist);
  border: 1px solid var(--about-card-line);
  border-radius: 999px;
  padding: 8px 16px;
  transition: color .18s var(--ease), border-color .18s var(--ease), background-color .18s var(--ease), transform .18s var(--ease);
}

.page-about .about-coverage__chip:hover {
  color: var(--snow);
  border-color: var(--line-strong);
  background-color: rgba(34, 211, 238, .12);
  transform: translateY(-2px);
}

.page-about .about-coverage__stats {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: 26px;
}

.page-about .about-coverage__stats .stat {
  border: 1px solid var(--about-card-line);
  border-radius: var(--radius-md);
  padding: 20px;
  background: linear-gradient(160deg, rgba(34, 211, 238, .10), rgba(11, 27, 58, .9));
}

.page-about .about-coverage__stats .stat__num {
  font-family: var(--font-mono);
  font-size: 34px;
  line-height: 1.1;
  letter-spacing: .08em;
  color: var(--cyan-light);
  display: block;
  margin-bottom: 8px;
}

.page-about .about-coverage__unit {
  font-size: 16px;
  margin-left: 4px;
  color: var(--mist);
}

.page-about .about-coverage__stats .stat__label {
  display: block;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .about-coverage__note {
  margin: 22px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist);
  max-width: 44em;
}

/* ---------- 版本阶梯 ---------- */
.page-about .about-versions {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-versions__item {
  border-left: 2px solid var(--line-strong);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 14px 18px;
  background: linear-gradient(90deg, rgba(34, 211, 238, .09), rgba(34, 211, 238, 0) 78%);
  transition: border-color .18s var(--ease), background-color .18s var(--ease);
}

.page-about .about-versions__item:hover {
  border-color: var(--cyan);
  background-color: rgba(34, 211, 238, .06);
}

.page-about .about-versions__tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: .08em;
  color: var(--ink);
  background: var(--cyan);
  border-radius: 6px;
  padding: 2px 10px;
  margin-bottom: 10px;
}

.page-about .about-versions__item h3 {
  font-family: var(--font-heading);
  font-size: 18px;
  line-height: 1.4;
  color: var(--snow);
  margin: 0 0 8px;
}

.page-about .about-versions__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 编号归档 ---------- */
.page-about .about-archive {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
}

.page-about .about-archive__text p {
  margin: 0 0 16px;
  color: var(--mist);
  font-size: 15px;
  line-height: 1.8;
}

.page-about .about-archive__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px !important;
}

.page-about .about-archive__panel {
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-lg);
  padding: 24px 22px;
  background: linear-gradient(200deg, rgba(124, 92, 255, .22), rgba(11, 27, 58, .94));
}

.page-about .about-archive__panel-title {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 15px;
  letter-spacing: .08em;
  color: var(--cyan-light);
}

.page-about .about-archive__ruler {
  height: 52px;
  border: 1px solid var(--about-card-line);
  border-radius: 10px;
  background-image:
    repeating-linear-gradient(90deg, rgba(34, 211, 238, .55) 0 1px, transparent 1px 14px),
    linear-gradient(120deg, rgba(34, 211, 238, .14), rgba(124, 92, 255, .18));
  background-size: auto 60%, auto 100%;
  background-position: 8px bottom 6px, 0 0;
  background-repeat: repeat-x, no-repeat;
}

.page-about .about-archive__facts {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-archive__facts li {
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
  border-top: 1px solid var(--about-card-line);
  padding-top: 12px;
}

.page-about .about-archive__facts .mono {
  font-family: var(--font-mono);
  letter-spacing: .08em;
  color: var(--cyan);
  margin-right: 6px;
}

/* ---------- 资质与承诺 ---------- */
.page-about .about-trust {
  margin: 0;
  border-top: 1px solid var(--about-card-line);
}

.page-about .about-trust__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 20px 0;
  border-bottom: 1px solid var(--about-card-line);
}

.page-about .about-trust__key {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--cyan);
}

.page-about .about-trust dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
  max-width: 46em;
}

/* ---------- 收束 CTA ---------- */
.page-about .about-cta {
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-lg);
  padding: 30px 24px;
  background:
    radial-gradient(110% 120% at 0% 0%, rgba(34, 211, 238, .16), transparent 62%),
    linear-gradient(120deg, rgba(124, 92, 255, .22), rgba(11, 27, 58, .94));
}

.page-about .about-cta h2 {
  font-family: var(--font-heading);
  font-size: 22px;
  line-height: 1.35;
  color: var(--snow);
  margin: 0 0 12px;
}

.page-about .about-cta > p {
  margin: 0;
  color: var(--mist);
  font-size: 15px;
  line-height: 1.8;
  max-width: 46em;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

/* ---------- 平板与桌面 ---------- */
@media (min-width: 700px) {
  .page-about .about-team {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .page-about .about-trust__row {
    grid-template-columns: 150px minmax(0, 1fr);
    gap: 20px;
    align-items: baseline;
  }
}

@media (min-width: 860px) {
  .page-about .about-hero {
    padding: 92px 0 50px;
  }

  .page-about .about-hero h1 {
    font-size: 44px;
  }

  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 24px;
  }

  .page-about .about-timeline__list {
    --about-indent: 40px;
  }

  .page-about .about-timeline__item h3 {
    font-size: 20px;
  }

  .page-about .about-versions__item:nth-child(2) {
    margin-left: 34px;
  }

  .page-about .about-versions__item:nth-child(3) {
    margin-left: 68px;
  }

  .page-about .about-versions__item:nth-child(4) {
    margin-left: 102px;
  }

  .page-about .about-archive {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 40px;
    align-items: start;
  }

  .page-about .about-cta {
    padding: 42px 40px;
  }
}

@media (min-width: 1080px) {
  .page-about .about-cta h2 {
    font-size: 26px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-team__card,
  .page-about .about-coverage__chip,
  .page-about .about-versions__item,
  .page-about .about-timeline__item::before {
    transition: none;
  }

  .page-about .about-team__card:hover,
  .page-about .about-team__card[open],
  .page-about .about-coverage__chip:hover {
    transform: none;
  }
}