/* ===== 平台概览 /overview/ ===== */
.page-about {
  display: block;
  padding-bottom: 72px;
  background-image:
    radial-gradient(760px 460px at 92% -6%, rgba(47, 243, 200, 0.10), transparent 64%),
    radial-gradient(600px 420px at -8% 16%, rgba(53, 210, 232, 0.07), transparent 62%);
  background-repeat: no-repeat;
}

.page-about .breadcrumb {
  margin: 20px 0 0;
}

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

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: 22px 0 4px;
}

.page-about .about-hero__grid {
  display: grid;
  gap: 26px;
}

.page-about .about-hero .page-title {
  margin: 12px 0 14px;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(32px, 8.4vw, 58px);
  line-height: 1.06;
  letter-spacing: -0.015em;
  color: var(--paper);
}

.page-about .about-hero__intro {
  margin: 0;
  max-width: 46ch;
  font-size: 16px;
  line-height: 1.72;
  color: var(--mist);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}

.page-about .about-hero__stats {
  padding: 18px 18px 6px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--glass);
}

.page-about .about-hero__stats-title {
  margin: 0 0 4px;
  font-family: var(--font-display);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--neon);
}

.page-about .stat-list {
  margin: 0;
  padding: 0;
}

.page-about .stat-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding: 13px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .stat-row:last-child {
  border-bottom: 0;
}

.page-about .stat-row__key {
  margin: 0;
  font-size: 13px;
  letter-spacing: 0.05em;
  color: var(--mist);
}

.page-about .stat-row__val {
  margin: 0;
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-size: 18px;
  letter-spacing: -0.02em;
  color: var(--paper);
  white-space: nowrap;
}

.page-about .stat-row__val .num {
  color: var(--neon);
  font-size: 22px;
}

/* ---------- 区块基础 ---------- */
.page-about .about-section {
  padding-top: 58px;
}

.page-about .about-section__head {
  max-width: 64ch;
}

.page-about .about-section__title {
  margin: 8px 0 12px;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(25px, 5.6vw, 39px);
  line-height: 1.12;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-section__lede {
  margin: 0;
  font-size: 16px;
  line-height: 1.72;
  color: var(--mist);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline__grid {
  display: grid;
  gap: 30px;
  margin-top: 28px;
}

.page-about .tl {
  position: relative;
  margin: 0;
  padding: 0 0 0 26px;
  list-style: none;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 14px;
  bottom: 8px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--neon) 0%, var(--electric) 46%, rgba(29, 66, 52, 0.9) 100%);
}

.page-about .tl__item {
  position: relative;
  padding: 0 0 24px;
  outline: none;
}

.page-about .tl__item::before {
  content: "";
  position: absolute;
  left: -25px;
  top: 5px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--night);
  border: 2px solid var(--line);
  transition: border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .tl__item:hover::before,
.page-about .tl__item:focus::before,
.page-about .tl__item:focus-visible::before {
  border-color: var(--neon);
  box-shadow: 0 0 0 4px rgba(47, 243, 200, 0.14);
}

.page-about .tl__stage {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin: 0 0 5px;
}

.page-about .tl__num {
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--neon);
}

.page-about .tl__year {
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--mist);
}

.page-about .tl__title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  line-height: 1.3;
  color: var(--paper);
}

.page-about .tl__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.66;
  color: var(--mist);
}

.page-about .tl__detail {
  margin: 10px 0 0;
  padding: 9px 12px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line);
  background: var(--glass-soft);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mist);
  opacity: 0.72;
  transition: opacity var(--dur) var(--ease), border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .tl__item:hover .tl__detail,
.page-about .tl__item:focus .tl__detail,
.page-about .tl__item:focus-within .tl__detail {
  opacity: 1;
  border-color: var(--neon);
  transform: translateY(-2px);
  color: var(--paper);
}

.page-about .about-timeline__figure {
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--stand);
}

/* ---------- 数据覆盖 ---------- */
.page-about .about-coverage__grid {
  display: grid;
  gap: 26px;
}

.page-about .about-coverage__figure {
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--stand);
}

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

.page-about .fact-list li {
  position: relative;
  padding-left: 20px;
  font-size: 15px;
  line-height: 1.66;
  color: var(--mist);
}

.page-about .fact-list li::before {
  content: "";
  position: absolute;
  left: 3px;
  top: 8px;
  width: 7px;
  height: 7px;
  border-radius: 2px;
  background: var(--neon);
  transform: rotate(45deg);
}

/* ---------- 迭代节奏 ---------- */
.page-about .about-release__grid {
  display: grid;
  gap: 26px;
}

.page-about .about-release__figure {
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--stand);
}

.page-about .spec-grid {
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--line);
  overflow: hidden;
}

.page-about .spec-cell {
  padding: 14px 15px;
  background: var(--night);
}

.page-about .spec-cell dt {
  margin: 0 0 5px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--mist);
}

.page-about .spec-cell dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.5;
  color: var(--paper);
  font-variant-numeric: tabular-nums;
}

/* ---------- 团队分工 ---------- */
.page-about .about-team__grid {
  display: grid;
  gap: 16px;
  margin-top: 26px;
}

.page-about .team-card {
  padding: 20px 18px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--glass);
  outline: none;
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .team-card:hover,
.page-about .team-card:focus,
.page-about .team-card:focus-visible {
  transform: translateY(-3px);
  border-color: var(--neon);
}

.page-about .team-card__head {
  display: flex;
  align-items: baseline;
  gap: 6px;
  margin: 0;
}

.page-about .team-card__num {
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-size: 32px;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--neon);
}

.page-about .team-card__unit {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--mist);
}

.page-about .team-card__title {
  margin: 12px 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  letter-spacing: 0.02em;
  color: var(--paper);
}

.page-about .team-card__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.68;
  color: var(--mist);
}

.page-about .team-card__meta {
  display: grid;
  gap: 6px;
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px dashed var(--line);
  font-size: 13px;
  line-height: 1.55;
  color: var(--mist);
  opacity: 0.72;
  transition: opacity var(--dur) var(--ease);
}

.page-about .team-card:hover .team-card__meta,
.page-about .team-card:focus .team-card__meta,
.page-about .team-card:focus-visible .team-card__meta {
  opacity: 1;
}

.page-about .team-card__key {
  display: inline-block;
  min-width: 62px;
  margin-right: 8px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--electric);
}

/* ---------- 高峰保障 ---------- */
.page-about .about-peak__grid {
  display: grid;
  gap: 26px;
}

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

.page-about .peak-item {
  padding: 16px 16px 14px;
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--neon);
  background: var(--glass-soft);
}

.page-about .peak-item__num {
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--orange);
}

.page-about .peak-item__title {
  margin: 6px 0 6px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16px;
  color: var(--paper);
}

.page-about .peak-item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.66;
  color: var(--mist);
}

/* ---------- 纠错通道 ---------- */
.page-about .about-correct__inner {
  display: grid;
  gap: 22px;
  padding: 24px 20px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--glass);
}

.page-about .about-correct__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-self: start;
}

/* ---------- 断点 ---------- */
@media (min-width: 720px) {
  .page-about .spec-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 900px) {
  .page-about .about-hero {
    padding-top: 34px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: 1.15fr 0.85fr;
    align-items: start;
    gap: 40px;
  }

  .page-about .about-section {
    padding-top: 74px;
  }

  .page-about .about-timeline__grid {
    grid-template-columns: 1fr 0.9fr;
    gap: 44px;
    align-items: start;
  }

  .page-about .about-coverage__grid {
    grid-template-columns: 1.05fr 0.95fr;
    gap: 44px;
    align-items: center;
  }

  .page-about .about-release__grid {
    grid-template-columns: 0.8fr 1.2fr;
    gap: 46px;
    align-items: center;
  }

  .page-about .about-peak__grid {
    grid-template-columns: 0.95fr 1.05fr;
    gap: 44px;
    align-items: start;
  }

  .page-about .about-correct__inner {
    grid-template-columns: 1.4fr 0.6fr;
    align-items: center;
    padding: 32px 30px;
  }
}

@media (min-width: 1180px) {
  .page-about .about-hero__grid {
    gap: 56px;
  }

  .page-about .tl {
    padding-left: 30px;
  }

  .page-about .tl__item::before {
    left: -29px;
  }

  .page-about .tl::before {
    left: 8px;
  }
}
</main>