.page-about {
  --about-cyan: var(--tbs-cyan);
  --about-flame: var(--tbs-flame);
  --about-violet: var(--tbs-violet);
  --about-mint: var(--tbs-mint);
  --about-gap: clamp(52px, 8vw, 118px);
  --about-body: clamp(15px, 1.05vw, 17px);
  display: block;
  overflow-x: hidden;
  background:
    radial-gradient(1100px 560px at 88% -6%, rgba(138, 107, 255, .14), transparent 62%),
    radial-gradient(880px 480px at 2% 6%, rgba(53, 242, 224, .09), transparent 58%),
    var(--tbs-ink);
  color: var(--tbs-ice);
  font-family: var(--font-body);
  font-size: var(--about-body);
  line-height: 1.78;
  padding-bottom: clamp(40px, 6vw, 84px);
}

.page-about *,
.page-about *::before,
.page-about *::after {
  box-sizing: border-box;
}

.page-about a {
  color: var(--about-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 242, 224, .35);
  transition: color .18s var(--tbs-ease), border-color .18s var(--tbs-ease);
}

.page-about a:hover,
.page-about a:focus-visible {
  color: var(--about-flame);
  border-color: rgba(255, 106, 43, .6);
}

.page-about h1,
.page-about h2,
.page-about h3 {
  margin: 0;
}

.page-about p {
  margin: 0 0 1em;
}

.page-about .about-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: -.02em;
}

/* ---------- 面包屑 ---------- */

.page-about .about-crumb {
  padding-top: calc(var(--tbs-header-h) + clamp(18px, 3vw, 34px));
}

.page-about .about-crumb__sep {
  margin: 0 .55em;
  color: var(--tbs-mist);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  padding-top: clamp(30px, 5vw, 58px);
  padding-bottom: clamp(26px, 4vw, 44px);
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(34px, 6.4vw, 76px);
  line-height: 1.04;
  letter-spacing: -.022em;
  margin: clamp(14px, 2vw, 24px) 0 clamp(18px, 2.4vw, 30px);
  max-width: 15em;
}

.page-about .about-hero__hl {
  font-style: normal;
  position: relative;
  color: var(--about-cyan);
  white-space: nowrap;
}

.page-about .about-hero__hl::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -.1em;
  height: 3px;
  background: linear-gradient(90deg, var(--about-cyan), var(--about-flame));
}

.page-about .about-hero__lede {
  max-width: 46em;
  color: #cbd8ef;
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 22px;
  margin: clamp(28px, 4vw, 46px) 0 0;
  padding-top: clamp(20px, 3vw, 30px);
  border-top: 1px solid var(--tbs-line);
}

.page-about .about-hero__fact dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--tbs-mist);
  margin-bottom: 6px;
}

.page-about .about-hero__fact dd {
  margin: 0;
  font-size: clamp(17px, 1.6vw, 21px);
  color: var(--tbs-ice);
}

.page-about .about-hero__fact dd .about-num {
  font-size: 1.45em;
  font-weight: 700;
  color: var(--about-cyan);
  margin-right: .18em;
}

/* ---------- 图片 ---------- */

.page-about .about-figure {
  margin: 0;
  position: relative;
}

.page-about .about-figure__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--tbs-radius);
  background: linear-gradient(140deg, var(--tbs-ink-2), var(--tbs-panel));
}

.page-about .about-figure__cap {
  margin-top: 14px;
  padding-left: 14px;
  border-left: 2px solid rgba(53, 242, 224, .55);
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--tbs-mist);
  max-width: 62em;
}

.page-about .about-figure--inset {
  margin-bottom: clamp(34px, 5vw, 56px);
}

.page-about .about-figure--side {
  margin-top: clamp(34px, 5vw, 58px);
}

/* ---------- 章节通用 ---------- */

.page-about .about-sec {
  padding-block: var(--about-gap);
  position: relative;
}

.page-about .about-sec__head {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 10px;
  margin-bottom: clamp(26px, 4vw, 46px);
}

.page-about .about-sec__no {
  font-family: var(--font-display);
  font-size: clamp(46px, 8vw, 92px);
  font-weight: 800;
  line-height: .88;
  letter-spacing: -.03em;
  color: transparent;
  -webkit-text-stroke: 1px rgba(53, 242, 224, .5);
}

.page-about .about-sec__band {
  display: block;
  width: 74px;
  height: 3px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--about-cyan), var(--about-flame));
}

.page-about .about-sec__title {
  font-family: var(--font-serif);
  font-weight: 800;
  font-size: clamp(23px, 3.3vw, 38px);
  line-height: 1.3;
  letter-spacing: -.01em;
  max-width: 20em;
}

.page-about .about-prose {
  max-width: 62em;
}

.page-about .about-prose p {
  color: #c7d4ea;
}

.page-about .about-prose__lead {
  font-family: var(--font-serif);
  font-size: clamp(17px, 1.7vw, 22px);
  line-height: 1.7;
  color: var(--tbs-ice) !important;
  margin-bottom: 1.1em;
}

.page-about .about-prose__lead--wide {
  max-width: 46em;
  margin-bottom: clamp(24px, 3.4vw, 40px);
  color: var(--tbs-ice);
}

/* ---------- 首章刻度条 ---------- */

.page-about .about-marks {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  list-style: none;
  margin: clamp(30px, 4.4vw, 50px) 0 0;
  padding: 0;
  border-top: 1px solid var(--tbs-line);
}

.page-about .about-marks__item {
  display: grid;
  grid-template-columns: auto auto 1fr;
  align-items: baseline;
  gap: 6px 10px;
  padding: 18px 0;
  border-bottom: 1px solid var(--tbs-line-soft);
}

.page-about .about-marks__num {
  font-family: var(--font-mono);
  font-size: clamp(26px, 4vw, 40px);
  font-weight: 700;
  color: var(--about-cyan);
  line-height: 1;
}

.page-about .about-marks__unit {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--tbs-mist);
}

.page-about .about-marks__item p {
  margin: 0;
  grid-column: 1 / -1;
  font-size: 14.5px;
  color: var(--tbs-mist);
}

/* ---------- 年份刻度 ---------- */

.page-about .about-sec--timeline {
  background:
    linear-gradient(180deg, rgba(11, 17, 32, 0) 0%, rgba(11, 17, 32, .92) 16%, rgba(11, 17, 32, .92) 84%, rgba(11, 17, 32, 0) 100%);
}

.page-about .about-ruler {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
}

.page-about .about-ruler__node {
  position: relative;
  padding: 22px 0 20px;
  border-top: 1px solid var(--tbs-line);
}

.page-about .about-ruler__dot {
  position: absolute;
  top: -5px;
  left: 0;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--about-cyan);
  box-shadow: 0 0 0 5px rgba(53, 242, 224, .1);
}

.page-about .about-ruler__node:nth-child(4) .about-ruler__dot,
.page-about .about-ruler__node:nth-child(5) .about-ruler__dot,
.page-about .about-ruler__node:nth-child(6) .about-ruler__dot {
  background: var(--about-flame);
  box-shadow: 0 0 0 5px rgba(255, 106, 43, .12);
}

.page-about .about-ruler__year {
  display: block;
  font-family: var(--font-mono);
  font-size: 21px;
  font-weight: 700;
  color: var(--tbs-ice);
  letter-spacing: -.01em;
  padding-left: 20px;
  margin-bottom: 8px;
}

.page-about .about-ruler__name {
  font-family: var(--font-display);
  font-size: clamp(19px, 2.2vw, 24px);
  font-weight: 600;
  letter-spacing: .01em;
  color: var(--tbs-ice);
  margin-bottom: 8px;
}

.page-about .about-ruler__more {
  border: 0;
}

.page-about .about-ruler__more summary {
  cursor: pointer;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--about-violet);
  padding: 4px 0;
  transition: color .18s var(--tbs-ease);
}

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

.page-about .about-ruler__more summary::before {
  content: "+ ";
  font-family: var(--font-mono);
}

.page-about .about-ruler__more[open] summary::before {
  content: "– ";
}

.page-about .about-ruler__more summary:hover,
.page-about .about-ruler__more summary:focus-visible {
  color: var(--about-cyan);
}

.page-about .about-ruler__more p {
  margin: 8px 0 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--tbs-mist);
}

/* ---------- 团队 ---------- */

.page-about .about-team {
  margin-top: clamp(20px, 3vw, 34px);
}

.page-about .about-team__bar {
  display: flex;
  width: 100%;
  height: 66px;
  border-radius: 10px;
  overflow: hidden;
  gap: 2px;
}

.page-about .about-team__seg {
  flex: var(--seg) 1 0;
  min-width: 22px;
  position: relative;
  transition: filter .18s var(--tbs-ease);
}

.page-about .about-team__seg::after {
  content: attr(data-label);
}

.page-about .about-team__seg--a { background: linear-gradient(180deg, rgba(53, 242, 224, .95), rgba(53, 242, 224, .55)); }
.page-about .about-team__seg--b { background: linear-gradient(180deg, rgba(138, 107, 255, .95), rgba(138, 107, 255, .5)); }
.page-about .about-team__seg--c { background: linear-gradient(180deg, rgba(255, 106, 43, .95), rgba(255, 106, 43, .5)); }
.page-about .about-team__seg--d { background: linear-gradient(180deg, rgba(124, 255, 178, .95), rgba(124, 255, 178, .5)); }

.page-about .about-team__seg:hover {
  filter: brightness(1.22);
}

.page-about .about-team__legend {
  list-style: none;
  margin: clamp(26px, 3.6vw, 42px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
}

.page-about .about-team__item {
  position: relative;
  padding-left: 18px;
  border-left: 2px solid var(--tbs-line);
}

.page-about .about-team__item--a { border-left-color: rgba(53, 242, 224, .7); }
.page-about .about-team__item--b { border-left-color: rgba(138, 107, 255, .7); }
.page-about .about-team__item--c { border-left-color: rgba(255, 106, 43, .7); }
.page-about .about-team__item--d { border-left-color: rgba(124, 255, 178, .7); }

.page-about .about-team__count {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.4vw, 36px);
  font-weight: 700;
  line-height: 1;
  color: var(--tbs-ice);
  margin-bottom: 6px;
}

.page-about .about-team__role {
  font-family: var(--font-serif);
  font-size: clamp(17px, 1.8vw, 20px);
  font-weight: 800;
  margin-bottom: 6px;
}

.page-about .about-team__item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--tbs-mist);
}

/* ---------- 数据来源 ---------- */

.page-about .about-sec--source {
  background: linear-gradient(180deg, rgba(22, 32, 58, .55), rgba(5, 7, 14, 0));
}

.page-about .about-sources {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .about-source {
  background: rgba(11, 17, 32, .82);
  border-radius: var(--tbs-radius);
  border-left: 3px solid rgba(53, 242, 224, .55);
  overflow: hidden;
}

.page-about .about-source:nth-child(2) { border-left-color: rgba(138, 107, 255, .6); }
.page-about .about-source:nth-child(3) { border-left-color: rgba(255, 106, 43, .6); }

.page-about .about-source__head {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 18px 18px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-source__idx {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--tbs-mist);
  white-space: nowrap;
}

.page-about .about-source__name {
  font-family: var(--font-display);
  font-size: clamp(18px, 2.2vw, 22px);
  font-weight: 600;
  letter-spacing: .01em;
  color: var(--tbs-ice);
  flex: 1 1 auto;
}

.page-about .about-source__toggle {
  position: relative;
  width: 14px;
  height: 14px;
  flex: 0 0 auto;
}

.page-about .about-source__toggle::before,
.page-about .about-source__toggle::after {
  content: "";
  position: absolute;
  background: var(--about-cyan);
  transition: transform .2s var(--tbs-ease), opacity .2s var(--tbs-ease);
}

.page-about .about-source__toggle::before {
  left: 0;
  top: 6px;
  width: 14px;
  height: 2px;
}

.page-about .about-source__toggle::after {
  left: 6px;
  top: 0;
  width: 2px;
  height: 14px;
}

.page-about .about-source[open] .about-source__toggle::after {
  transform: scaleY(0);
  opacity: 0;
}

.page-about .about-source__body {
  padding: 0 18px 20px;
}

.page-about .about-source__body p {
  margin: 0 0 14px;
  font-size: 14.5px;
  line-height: 1.75;
  color: #c2d0e8;
}

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

.page-about .about-source__fields li {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .04em;
  color: var(--about-cyan);
  padding: 4px 10px;
  border: 1px solid rgba(53, 242, 224, .3);
  border-radius: 999px;
}

/* ---------- 准确率 ---------- */

.page-about .about-accuracy {
  margin-top: clamp(34px, 4.6vw, 58px);
  display: grid;
  gap: clamp(24px, 3.2vw, 38px);
}

.page-about .about-accuracy__row {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: end;
  gap: 8px 18px;
}

.page-about .about-accuracy__label {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .about-accuracy__name {
  font-size: 15px;
  color: var(--tbs-ice);
}

.page-about .about-accuracy__note {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .04em;
  color: var(--tbs-mist);
}

.page-about .about-accuracy__value {
  font-family: var(--font-mono);
  font-size: clamp(24px, 3.4vw, 34px);
  font-weight: 700;
  line-height: 1;
  color: var(--about-cyan);
  white-space: nowrap;
}

.page-about .about-accuracy__value em {
  font-style: normal;
  font-size: .55em;
  margin-left: .1em;
}

.page-about .about-accuracy__track {
  grid-column: 1 / -1;
  position: relative;
  height: 2px;
  background: var(--tbs-line);
  overflow: hidden;
}

.page-about .about-accuracy__fill {
  position: absolute;
  inset: 0 auto 0 0;
  display: block;
  height: 100%;
}

.page-about .about-accuracy__fill--a {
  width: 99.98%;
  background: linear-gradient(90deg, var(--about-cyan), var(--about-mint));
}

.page-about .about-accuracy__fill--b {
  width: 99.6%;
  background: linear-gradient(90deg, var(--about-violet), var(--about-cyan));
}

/* ---------- 合作伙伴 ---------- */

.page-about .about-partners {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2px;
  margin-top: clamp(6px, 1.4vw, 16px);
}

.page-about .about-partner {
  padding: 24px 0;
  border-top: 1px solid var(--tbs-line);
}

.page-about .about-partner__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(32px, 4.6vw, 48px);
  font-weight: 700;
  line-height: 1;
  color: var(--about-flame);
  margin-bottom: 10px;
}

.page-about .about-partner__name {
  font-family: var(--font-serif);
  font-size: clamp(17px, 1.9vw, 21px);
  font-weight: 800;
  margin-bottom: 8px;
}

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

.page-about .about-partners__tail {
  margin: clamp(26px, 3.4vw, 40px) 0 0;
  padding: 18px 0 0;
  border-top: 1px solid var(--tbs-line-soft);
  font-size: 14.5px;
  color: var(--tbs-mist);
  max-width: 48em;
}

/* ---------- 做事标准 ---------- */

.page-about .about-sec--creed {
  background:
    linear-gradient(180deg, rgba(138, 107, 255, .07), rgba(5, 7, 14, 0) 70%);
}

.page-about .about-creed {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 2px;
}

.page-about .about-creed__item {
  display: grid;
  grid-template-columns: 46px 1fr;
  grid-template-areas:
    "mark title"
    "mark text";
  column-gap: 16px;
  row-gap: 6px;
  padding: 24px 0;
  border-top: 1px solid var(--tbs-line);
}

.page-about .about-creed__mark {
  grid-area: mark;
  font-family: var(--font-display);
  font-size: 34px;
  font-weight: 800;
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1px rgba(255, 106, 43, .65);
}

.page-about .about-creed__title {
  grid-area: title;
  font-family: var(--font-serif);
  font-size: clamp(18px, 2vw, 22px);
  font-weight: 800;
}

.page-about .about-creed__item p {
  grid-area: text;
  margin: 0;
  font-size: 14.5px;
  line-height: 1.76;
  color: var(--tbs-mist);
}

/* ---------- 底部行动区 ---------- */

.page-about .about-cta {
  margin-top: clamp(20px, 4vw, 56px);
  padding-block: clamp(38px, 5.4vw, 66px);
  background:
    linear-gradient(112deg, rgba(53, 242, 224, .1), rgba(255, 106, 43, .1) 58%, rgba(138, 107, 255, .1));
  border-top: 1px solid var(--tbs-line);
  border-bottom: 1px solid var(--tbs-line);
}

.page-about .about-cta__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 3vw, 38px);
  align-items: center;
}

.page-about .about-cta__title {
  font-family: var(--font-serif);
  font-size: clamp(21px, 2.8vw, 32px);
  font-weight: 800;
  line-height: 1.34;
  margin-bottom: 10px;
}

.page-about .about-cta__text p {
  margin: 0;
  font-size: 14.5px;
  color: var(--tbs-mist);
  max-width: 34em;
}

.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-cta__links .tbs-btn {
  border-bottom-width: 0;
}

/* ---------- 断点 ---------- */

@media (min-width: 620px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .about-marks__item {
    border-bottom: 0;
    border-right: 1px solid var(--tbs-line-soft);
    padding: 20px 18px 20px 0;
  }

  .page-about .about-marks__item:last-child {
    border-right: 0;
  }

  .page-about .about-team__legend {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 30px 34px;
  }

  .page-about .about-partners {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0 32px;
  }

  .page-about .about-partner {
    border-bottom: 1px solid var(--tbs-line);
  }

  .page-about .about-creed__item {
    grid-template-columns: 60px minmax(0, 1fr);
    padding: 30px 0;
  }
}

@media (min-width: 900px) {
  .page-about .about-ruler {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }

  .page-about .about-ruler__node {
    padding: 26px 22px 12px 0;
  }

  .page-about .about-ruler__node + .about-ruler__node::before {
    content: "";
    position: absolute;
    left: -14px;
    top: 4px;
    width: 1px;
    height: 100%;
    background: linear-gradient(180deg, var(--tbs-line), rgba(138, 155, 184, 0));
  }

  .page-about .about-figure--side {
    max-width: 76%;
    margin-left: auto;
  }

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

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
  }
}

@media (min-width: 1120px) {
  .page-about .about-sec__head {
    display: grid;
    grid-template-columns: 128px minmax(0, 1fr);
    grid-template-areas:
      "no band"
      "no title";
    column-gap: 28px;
    row-gap: 12px;
    align-items: start;
  }

  .page-about .about-sec__no {
    grid-area: no;
  }

  .page-about .about-sec__band {
    grid-area: band;
    align-self: end;
  }

  .page-about .about-sec__title {
    grid-area: title;
  }

  .page-about .about-prose {
    padding-left: 156px;
  }

  .page-about .about-prose__lead--wide {
    padding-left: 156px;
  }

  .page-about .about-team,
  .page-about .about-sources,
  .page-about .about-accuracy,
  .page-about .about-partners,
  .page-about .about-creed,
  .page-about .about-figure--inset {
    padding-left: 156px;
  }

  .page-about .about-ruler {
    padding-left: 156px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition-duration: .01ms !important;
    animation-duration: .01ms !important;
  }
}

.page-about {
  --seg: inherit;
}