.page-about {
  --about-indent: 48px;
  --about-node: 12px;
  padding-bottom: 8px;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding: 24px 0 52px;
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -24% -12% auto -12%;
  height: 132%;
  background:
    radial-gradient(760px 380px at 82% -4%, rgba(37, 225, 212, .16), transparent 68%),
    radial-gradient(620px 330px at 6% 104%, rgba(255, 138, 43, .12), transparent 70%);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 8.2vw, 58px);
  line-height: 1.07;
  letter-spacing: -.02em;
  color: var(--paper);
  margin: 12px 0 18px;
  max-width: 22ch;
}

.page-about .about-hero__text {
  color: var(--mist);
  font-size: 16px;
  line-height: 1.85;
  max-width: 58ch;
  margin: 0;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-hero__facts {
  margin-top: 34px;
  padding: 18px 18px 18px;
  border-radius: var(--radius);
}

.page-about .about-hero__facts-title {
  display: block;
  margin: 0 0 14px;
  color: var(--film);
}

.page-about .fact-list {
  margin: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border-radius: 10px;
  overflow: hidden;
}

.page-about .fact {
  display: flex;
  flex-direction: column;
  background: rgba(7, 11, 20, .58);
  padding: 14px 12px;
}

.page-about .fact__num {
  order: -1;
  margin: 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 22px;
  font-weight: 600;
  line-height: 1.1;
  color: var(--cyan);
}

.page-about .fact__label {
  margin: 7px 0 0;
  font-size: 12px;
  line-height: 1.5;
  color: var(--mist);
}

/* ---------- 通用小节 ---------- */

.page-about .sec-head {
  margin: 0 0 18px;
}

.page-about .about-lede {
  margin: 0 0 28px;
  color: var(--mist);
  font-size: 16px;
  line-height: 1.85;
  max-width: 62ch;
}

.page-about .about-audience,
.page-about .about-team,
.page-about .about-archive,
.page-about .about-accuracy {
  padding: 46px 0;
}

/* ---------- 服务对象 ---------- */

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

.page-about .audience {
  display: grid;
  grid-template-columns: 40px 1fr;
  gap: 14px;
  padding: 22px 0;
  border-top: 1px solid var(--line-soft);
}

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

.page-about .audience__num {
  padding-top: 5px;
  font-size: 14px;
  letter-spacing: .12em;
  color: var(--film);
}

.page-about .audience__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  line-height: 1.35;
  letter-spacing: .01em;
  color: var(--paper);
}

.page-about .audience__text {
  margin: 0 0 10px;
  color: var(--mist);
  font-size: 15px;
  line-height: 1.85;
  max-width: 60ch;
}

.page-about .audience__use {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.7;
  letter-spacing: .02em;
  color: var(--cyan);
}

/* ---------- 团队 ---------- */

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

.page-about .team-layout__aside {
  align-self: start;
}

.page-about .team-layout__aside .media {
  border-radius: var(--radius);
}

.page-about .team-layout__note {
  margin: 14px 0 0;
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.75;
  color: var(--mist);
  max-width: 40ch;
}

.page-about .team-index__item {
  padding: 20px 0 22px;
  border-top: 1px solid var(--line-soft);
}

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

.page-about .team-index__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
}

.page-about .team-index__count {
  flex: 0 0 auto;
  min-width: 56px;
  font-size: 30px;
  font-weight: 600;
  line-height: 1;
  color: var(--amber);
}

.page-about .team-index__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .team-index__desc {
  margin: 12px 0 0;
  color: var(--mist);
  font-size: 15px;
  line-height: 1.85;
  max-width: 62ch;
}

.page-about .team-index__sum {
  margin: 12px 0 0;
  padding-left: 12px;
  border-left: 2px solid rgba(37, 225, 212, .5);
  color: var(--cyan);
  font-size: 13.5px;
  line-height: 1.7;
  overflow: hidden;
}

/* ---------- 十年历程 ---------- */

.page-about .about-timeline {
  position: relative;
  padding: 48px 0 54px;
  background: linear-gradient(180deg, rgba(122, 43, 69, .16), rgba(7, 11, 20, 0) 58%);
}

.page-about .tl-visual {
  margin: 0 0 32px;
}

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

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 17px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--film) 0%, rgba(231, 194, 113, .32) 42%, rgba(37, 225, 212, .62) 100%);
}

.page-about .tl__item {
  position: relative;
  padding-bottom: 32px;
}

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

.page-about .tl__item::before {
  content: "";
  position: absolute;
  left: -37px;
  top: 4px;
  width: var(--about-node);
  height: var(--about-node);
  background: var(--ink-900);
  border: 2px solid var(--film);
  border-radius: 3px;
  transform: rotate(45deg);
}

.page-about .tl__year {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 14px;
  letter-spacing: .1em;
  color: var(--film);
}

.page-about .tl__body h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .tl__body p {
  margin: 0;
  color: var(--mist);
  font-size: 15px;
  line-height: 1.85;
  max-width: 60ch;
}

/* ---------- 影像库 ---------- */

.page-about .archive-figure {
  margin: 0 0 28px;
}

.page-about .archive-figure__cap {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.75;
  color: var(--mist);
  max-width: 62ch;
}

.page-about .archive-body__text p {
  margin: 0 0 16px;
  color: var(--mist);
  font-size: 15px;
  line-height: 1.85;
  max-width: 62ch;
}

.page-about .decade-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
}

.page-about .archive-meta {
  margin-top: 30px;
  border-top: 1px solid var(--line);
}

.page-about .archive-meta__row {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 16px;
  justify-content: space-between;
  padding: 13px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .archive-meta__key {
  flex: 0 0 auto;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--mist);
}

.page-about .archive-meta__val {
  font-size: 14px;
  font-weight: 500;
  color: var(--paper);
  text-align: right;
}

/* ---------- 准确率 ---------- */

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

.page-about .accuracy-hero {
  border-radius: var(--radius);
  padding: 26px 22px 24px;
  border-left: 3px solid var(--cyan);
}

.page-about .accuracy-hero__num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(44px, 13vw, 84px);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--cyan);
}

.page-about .accuracy-hero__label {
  display: block;
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .1em;
  color: var(--film);
}

.page-about .accuracy-hero__text {
  margin: 16px 0 0;
  color: var(--mist);
  font-size: 15px;
  line-height: 1.85;
  max-width: 46ch;
}

.page-about .accuracy-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .accuracy-list__item {
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  padding: 15px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .accuracy-list__key {
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--film);
}

.page-about .accuracy-list__val {
  font-size: 15px;
  line-height: 1.7;
  color: var(--paper);
}

/* ---------- 开放接口 ---------- */

.page-about .about-api {
  padding: 12px 0 60px;
}

.page-about .api-panel {
  border-radius: var(--radius);
  padding: 26px 22px 28px;
  border-top: 2px solid var(--amber);
}

.page-about .api-panel__title {
  margin: 12px 0 14px;
  font-family: var(--font-display);
  font-size: clamp(23px, 5.4vw, 32px);
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-about .api-panel__text {
  margin: 0;
  color: var(--mist);
  font-size: 15px;
  line-height: 1.85;
  max-width: 60ch;
}

.page-about .api-panel__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.page-about .api-panel__list {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .api-panel__list li {
  padding: 13px 0;
  border-bottom: 1px solid var(--line-soft);
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .api-panel__list .mono {
  font-size: 20px;
  font-weight: 600;
  color: var(--amber);
  margin-right: 6px;
}

/* ---------- 响应式 ---------- */

@media (min-width: 700px) {
  .page-about .archive-meta__row {
    flex-wrap: nowrap;
  }

  .page-about .accuracy-list__item {
    grid-template-columns: 132px 1fr;
    gap: 20px;
    align-items: baseline;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 32px 0 66px;
  }

  .page-about .about-audience,
  .page-about .about-team,
  .page-about .about-archive,
  .page-about .about-accuracy {
    padding: 62px 0;
  }

  .page-about .about-timeline {
    padding: 64px 0 70px;
  }

  .page-about .audience {
    grid-template-columns: 72px 1fr;
    gap: 24px;
    padding: 28px 0;
  }

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

  .page-about .team-index__sum {
    max-height: 0;
    margin-top: 0;
    opacity: 0;
    transition: max-height .42s var(--ease), opacity .32s var(--ease), margin-top .32s var(--ease);
  }

  .page-about .team-index__item:hover .team-index__sum,
  .page-about .team-index__item:focus-within .team-index__sum {
    max-height: 8em;
    margin-top: 14px;
    opacity: 1;
  }

  .page-about .tl {
    padding-left: 64px;
  }

  .page-about .tl::before {
    left: 18px;
  }

  .page-about .tl__item {
    display: grid;
    grid-template-columns: 124px minmax(0, 1fr);
    gap: 28px;
    padding-bottom: 42px;
  }

  .page-about .tl__item::before {
    left: -51px;
    top: 3px;
  }

  .page-about .tl__year {
    text-align: right;
    margin-bottom: 0;
    padding-top: 2px;
  }

  .page-about .accuracy-grid {
    grid-template-columns: minmax(0, .92fr) minmax(0, 1.08fr);
    gap: 44px;
    align-items: start;
  }

  .page-about .accuracy-hero {
    padding: 32px 28px 30px;
  }

  .page-about .api-panel {
    padding: 38px 36px 40px;
  }

  .page-about .api-panel__list {
    margin-top: 6px;
    border-top: 0;
  }

  .page-about .api-panel__list li:first-child {
    border-top: 1px solid var(--line-soft);
  }
}

@media (min-width: 1024px) {
  .page-about .about-hero__inner {
    display: grid;
    grid-template-columns: minmax(0, 1.5fr) minmax(276px, .8fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .about-hero__facts {
    margin-top: 12px;
  }

  .page-about .team-layout {
    grid-template-columns: minmax(0, .8fr) minmax(0, 1.2fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .api-panel {
    display: grid;
    grid-template-columns: minmax(0, 1.3fr) minmax(250px, .7fr);
    gap: 44px;
    align-items: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .team-index__sum {
    transition: none;
  }
}