.page-about {
  --about-ink: #2b3446;
  --about-ink-soft: #55607a;
  --about-ink-inv: rgba(244, 241, 232, .76);
  background: var(--paper);
  color: var(--night);
  font-family: var(--font-body);
  line-height: 1.78;
  overflow-x: hidden;
}

.page-about p {
  margin: 0 0 16px;
}

.page-about a {
  color: var(--lake);
  text-decoration: none;
  border-bottom: 1px solid rgba(46, 155, 143, .4);
  transition: border-color 180ms var(--ease), color 180ms var(--ease);
}

.page-about a:hover,
.page-about a:focus-visible {
  color: var(--signal);
  border-bottom-color: var(--signal);
}

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

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  margin-top: 10px;
  padding: clamp(46px, 8vw, 96px) 0 clamp(52px, 8vw, 100px);
  background: var(--night);
  color: var(--paper);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(168, 218, 211, .07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(168, 218, 211, .07) 1px, transparent 1px);
  background-size: 68px 68px;
  pointer-events: none;
}

.page-about .about-hero__band {
  position: absolute;
  right: -8%;
  bottom: -18%;
  width: min(720px, 84%);
  height: 66%;
  background: linear-gradient(140deg, rgba(46, 155, 143, .34) 0%, rgba(46, 155, 143, .05) 62%, transparent 100%);
  clip-path: polygon(20% 0, 100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}

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

.page-about .about-hero__kicker {
  color: var(--lake-pale);
  margin: 0;
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(32px, 6.6vw, 64px);
  line-height: 1.06;
  letter-spacing: -.012em;
  margin: 14px 0 22px;
  max-width: 17ch;
  color: var(--paper);
}

.page-about .about-hero__lede {
  max-width: 54ch;
  font-size: clamp(16px, 1.7vw, 18px);
  color: var(--about-ink-inv);
  line-height: 1.85;
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(30px, 4.5vw, 48px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--hair-dark);
  border: 1px solid var(--hair-dark);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-hero__facts li {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 18px 20px;
  background: var(--night-2);
}

.page-about .about-hero__figure {
  font-size: clamp(22px, 2.6vw, 30px);
  line-height: 1.1;
  color: var(--lake-pale);
  font-weight: 600;
}

.page-about .about-hero__facts .label {
  color: rgba(244, 241, 232, .6);
}

/* ---------- 章节骨架 ---------- */

.page-about .about-chapter {
  padding: clamp(46px, 7.5vw, 92px) 0;
  border-top: 1px solid var(--hair);
  background: var(--paper);
}

.page-about .about-chapter__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .about-chapter__mark {
  display: flex;
  align-items: center;
  gap: 14px;
}

.page-about .about-chapter__num {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(38px, 6.2vw, 62px);
  line-height: .9;
  letter-spacing: -.02em;
  color: var(--lake);
}

.page-about .about-chapter__rule {
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, var(--lake) 0%, rgba(46, 155, 143, .1) 100%);
}

.page-about .about-chapter__title {
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: clamp(21px, 3.1vw, 30px);
  line-height: 1.4;
  letter-spacing: .004em;
  margin: 8px 0 20px;
  color: var(--night);
}

.page-about .about-chapter__body > p {
  font-size: 16.5px;
  color: var(--about-ink);
  max-width: 68ch;
}

.page-about .about-chapter__body > p a {
  color: var(--lake);
}

/* 深色章节 */

.page-about .about-chapter--night {
  background: var(--night);
  color: var(--paper);
  border-top-color: transparent;
}

.page-about .about-chapter--night .about-chapter__num {
  color: var(--lake-pale);
}

.page-about .about-chapter--night .about-chapter__rule {
  background: linear-gradient(90deg, var(--lake-pale) 0%, rgba(168, 218, 211, .08) 100%);
}

.page-about .about-chapter--night .about-chapter__title {
  color: var(--paper);
}

.page-about .about-chapter--night .about-chapter__body > p {
  color: var(--about-ink-inv);
}

.page-about .about-chapter--night .label {
  color: var(--lake-pale);
}

/* ---------- 01 赛季刻度 ---------- */

.page-about .season-scale {
  margin: 32px 0 0;
  max-width: 780px;
}

.page-about .season-scale__ticks {
  position: relative;
  display: flex;
  justify-content: space-between;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .season-scale__ticks::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 5px;
  height: 2px;
  background: linear-gradient(90deg, var(--u13), var(--u15), var(--u16), var(--u17), var(--u19));
  opacity: .55;
}

.page-about .season-scale__tick {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 9px;
  min-width: 0;
}

.page-about .season-scale__tick .num {
  font-size: 13px;
  letter-spacing: .02em;
  color: var(--rock);
}

.page-about .season-scale__dot {
  position: relative;
  z-index: 1;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--paper);
  border: 2px solid var(--lake);
}

.page-about .season-scale__tick.is-now .season-scale__dot {
  background: var(--signal);
  border-color: var(--signal);
  box-shadow: 0 0 0 5px rgba(242, 100, 48, .18);
}

.page-about .season-scale__tick.is-now .num {
  color: var(--signal);
  font-weight: 600;
}

.page-about .season-scale__note {
  margin: 14px 0 0;
  font-size: 13.5px;
  color: var(--rock);
}

/* ---------- 02 团队 ---------- */

.page-about .team-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  margin-top: 34px;
}

.page-about .team-cards {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  align-content: start;
}

.page-about .team-card {
  position: relative;
  padding: 18px 18px 16px;
  background: var(--paper-lift);
  border: 1px solid var(--edge);
  border-top: 3px solid var(--lake);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sheet);
}

.page-about .team-card .label {
  color: var(--rock);
  margin: 0 0 6px;
}

.page-about .team-card__title {
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: 17px;
  line-height: 1.45;
  margin: 0 0 8px;
  color: var(--night);
}

.page-about .team-card p:last-child {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--about-ink-soft);
}

.page-about .team-card--collect { border-top-color: var(--lake); }
.page-about .team-card--verify  { border-top-color: var(--u17); }
.page-about .team-card--product { border-top-color: var(--clay); }
.page-about .team-card--service { border-top-color: var(--signal); }

.page-about .team-figure {
  margin: 0;
}

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

/* ---------- 03 来源清单 ---------- */

.page-about .source-list {
  list-style: none;
  margin: 26px 0 24px;
  padding: 0;
  border-top: 1px solid var(--hair);
}

.page-about .source-list li {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 16px 0;
  border-bottom: 1px solid var(--hair);
}

.page-about .source-list__key {
  color: var(--lake);
}

.page-about .source-list__text {
  font-size: 15.5px;
  color: var(--about-ink);
  line-height: 1.72;
}

/* ---------- 04 三层校验 ---------- */

.page-about .check-steps {
  list-style: none;
  margin: 28px 0 26px;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--hair-dark);
  border: 1px solid var(--hair-dark);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .check-steps li {
  padding: 22px 20px 20px;
  background: var(--night-2);
}

.page-about .check-steps__tag {
  color: var(--signal);
  margin: 0;
}

.page-about .check-steps__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 22px;
  letter-spacing: .01em;
  margin: 8px 0 10px;
  color: var(--paper);
}

.page-about .check-steps p {
  margin: 0;
  font-size: 14.8px;
  line-height: 1.72;
  color: var(--about-ink-inv);
}

.page-about .archive-frame {
  margin: 30px 0 0;
  height: clamp(118px, 17vw, 190px);
  overflow: hidden;
  border: 1px solid var(--hair-dark);
  border-radius: var(--radius);
}

.page-about .archive-frame img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .45;
}

/* ---------- 05 使用人群 ---------- */

.page-about .audience-grid {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .audience-card {
  display: flex;
  flex-direction: column;
  padding: 20px 18px;
  background: var(--paper-lift);
  border: 1px solid var(--edge);
  border-left: 3px solid var(--lake-pale);
  border-radius: var(--radius);
}

.page-about .audience-card .label {
  color: var(--rock);
  margin: 0 0 8px;
}

.page-about .audience-card__title {
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: 16.5px;
  line-height: 1.45;
  margin: 0 0 8px;
  color: var(--night);
}

.page-about .audience-card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--about-ink-soft);
}

/* ---------- 06 合作 ---------- */

.page-about .partner-list {
  list-style: none;
  margin: 26px 0 24px;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--hair);
  border-top: 1px solid var(--hair);
  border-bottom: 1px solid var(--hair);
}

.page-about .partner-list li {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 16px 0;
  background: var(--paper);
}

.page-about .partner-list__key {
  color: var(--clay);
}

.page-about .partner-list__text {
  font-size: 15.5px;
  color: var(--about-ink);
  line-height: 1.72;
}

/* ---------- 07 青海 ---------- */

.page-about .about-chapter--qinghai {
  padding-bottom: 0;
}

.page-about .qinghai-frame {
  margin: 38px 0 0;
}

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

.page-about .about-chapter--qinghai .frame-cap {
  color: var(--lake-pale);
}

/* ---------- 收尾 ---------- */

.page-about .about-cta {
  padding: clamp(48px, 7vw, 86px) 0 clamp(54px, 8vw, 96px);
  background: var(--night);
  color: var(--paper);
  border-top: 1px solid var(--hair-dark);
}

.page-about .about-cta__kicker {
  color: var(--signal);
  margin: 0;
}

.page-about .about-cta__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(26px, 4.4vw, 42px);
  line-height: 1.14;
  letter-spacing: -.01em;
  margin: 12px 0 18px;
  max-width: 20ch;
  color: var(--paper);
}

.page-about .about-cta__text {
  max-width: 62ch;
  color: var(--about-ink-inv);
  font-size: 16px;
  line-height: 1.82;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 26px 0 20px;
}

.page-about .about-cta__actions .btn {
  border-bottom: none;
  text-decoration: none;
}

.page-about .about-cta__aux {
  margin: 0;
  font-size: 14.5px;
  color: rgba(244, 241, 232, .62);
}

.page-about .about-cta__aux a {
  color: var(--lake-pale);
  border-bottom-color: rgba(168, 218, 211, .38);
  margin: 0 2px;
}

/* ---------- 断点 ---------- */

@media (min-width: 600px) {
  .page-about .team-cards,
  .page-about .audience-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .page-about .partner-list li {
    grid-template-columns: 168px minmax(0, 1fr);
    gap: 24px;
  }
}

@media (min-width: 760px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .source-list li {
    grid-template-columns: 200px minmax(0, 1fr);
    gap: 28px;
  }
}

@media (min-width: 960px) {
  .page-about .about-chapter__grid {
    grid-template-columns: 124px minmax(0, 1fr);
    gap: 44px;
  }

  .page-about .about-chapter__mark {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
    padding-top: 4px;
  }

  .page-about .about-chapter__rule {
    width: 100%;
    flex: none;
    height: 1px;
  }

  .page-about .team-layout {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    gap: 32px;
    align-items: start;
  }

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

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