.page-about {
  --ab-gap: 56px;
  --ab-ink-soft: #33475A;
  --ab-line-soft: #C9D6E0;
  --ab-body: var(--cool);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: 32px 0 40px;
  border-bottom: 1px solid var(--line);
}
.page-about .about-hero__grid {
  display: grid;
  gap: 32px;
}
.page-about .about-hero__title {
  margin: 16px 0 0;
  font-family: var(--font-head);
  font-weight: 800;
  letter-spacing: -0.01em;
  font-size: clamp(30px, 7.6vw, 56px);
  line-height: 1.1;
  color: var(--ice);
}
.page-about .about-hero__lede {
  margin: 20px 0 0;
  max-width: 62ch;
  font-size: 17px;
  line-height: 1.78;
  color: var(--cool);
}
.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  background: var(--line);
  border: 1px solid var(--line);
}
.page-about .about-fact {
  padding: 16px 18px;
  background: var(--deck);
}
.page-about .about-fact dt {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cool);
}
.page-about .about-fact dd {
  margin: 8px 0 0;
  font-family: var(--font-num);
  font-weight: 600;
  font-size: 24px;
  letter-spacing: 0.02em;
  color: var(--lime);
}

/* ---------- 章节基础 ---------- */
.page-about .about-band {
  padding: var(--ab-gap) 0;
  border-bottom: 1px solid var(--line);
  transition: background var(--t-mid);
}
.page-about .about-band--deck {
  background: var(--deck);
}
.page-about .about-band--light {
  background: var(--paper);
  color: var(--ink);
  border-bottom-color: var(--ab-line-soft);
}
.page-about .about-title {
  margin: 8px 0 0;
  font-family: var(--font-head);
  font-weight: 800;
  letter-spacing: -0.01em;
  font-size: clamp(23px, 4.6vw, 36px);
  line-height: 1.2;
  color: var(--ice);
}
.page-about .about-band--light .about-title {
  color: var(--ink);
}
.page-about .label--light {
  color: var(--steel);
}
.page-about .about-text {
  margin: 16px 0 0;
  max-width: 66ch;
  font-size: 17px;
  line-height: 1.78;
  color: var(--ab-body);
}
.page-about .about-band--light .about-text {
  color: var(--ab-ink-soft);
}
.page-about .about-text--wide {
  max-width: 78ch;
}
.page-about .about-text--tight {
  margin-top: 20px;
}
.page-about .about-text a {
  color: var(--lime);
  text-decoration: underline;
  text-underline-offset: 3px;
}
.page-about .about-band--light .about-text a {
  color: var(--steel);
}
.page-about .about-note {
  margin: 18px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--orange);
  font-size: 15px;
  line-height: 1.7;
  color: var(--cool);
}
.page-about .about-split {
  display: grid;
  gap: 32px;
}
.page-about .about-aside {
  padding-top: 20px;
  border-top: 1px solid var(--line);
}
.page-about .about-aside__text {
  margin: 0;
  font-size: 16px;
  line-height: 1.78;
  color: var(--cool);
}

/* ---------- 时间线 ---------- */
.page-about .timeline__scale {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 20px;
  margin: 28px 0 8px;
  padding: 12px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.page-about .timeline__scale a {
  font-family: var(--font-num);
  font-weight: 600;
  font-size: 14px;
  letter-spacing: 0.08em;
  color: var(--cool);
  text-decoration: none;
  padding-bottom: 2px;
  border-bottom: 1px solid transparent;
  transition: color var(--t-fast), border-color var(--t-fast);
}
.page-about .timeline__scale a:hover,
.page-about .timeline__scale a:focus-visible {
  color: var(--lime);
  border-bottom-color: var(--lime);
}
.page-about .timeline__list {
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .timeline__item {
  position: relative;
  display: grid;
  gap: 6px;
  padding: 20px 0 20px 22px;
  border-bottom: 1px solid var(--line);
  transition: background var(--t-fast);
}
.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 27px;
  width: 8px;
  height: 8px;
  background: var(--lime);
  transition: transform var(--t-fast);
}
.page-about .timeline__item:hover {
  background: var(--deck);
}
.page-about .timeline__item:hover::before {
  transform: translateY(-2px) scale(1.25);
}
.page-about .timeline__year {
  font-family: var(--font-num);
  font-weight: 600;
  font-size: 21px;
  letter-spacing: 0.06em;
  color: var(--lime);
}
.page-about .timeline__title {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 18px;
  line-height: 1.4;
  color: var(--ice);
}
.page-about .timeline__text {
  margin: 6px 0 0;
  font-size: 16px;
  line-height: 1.7;
  color: var(--cool);
}

/* ---------- 媒体框 ---------- */
.page-about .about-media {
  margin: 32px 0 0;
}
.page-about .about-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  gap: 1px;
  margin-top: 28px;
  background: var(--line);
  border: 1px solid var(--line);
}
.page-about .team-col {
  padding: 20px;
  background: var(--abyss);
}
.page-about .team-col__label {
  margin: 0;
  font-family: var(--font-num);
  font-weight: 600;
  font-size: 13px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--orange);
}
.page-about .team-col__title {
  margin: 10px 0 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 17px;
  line-height: 1.4;
  color: var(--ice);
}
.page-about .team-col__text {
  margin: 8px 0 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--cool);
}

/* ---------- 流程 SVG ---------- */
.page-about .flow-scroll {
  margin-top: 28px;
  overflow-x: auto;
  border: 1px solid var(--line);
  padding: 12px;
}
.page-about .about-flow {
  display: block;
  width: 100%;
  min-width: 640px;
  height: auto;
}
.page-about .flow__box {
  fill: var(--deck);
  stroke: var(--line);
  stroke-width: 1;
}
.page-about .flow__link {
  stroke: var(--steel);
  stroke-width: 1;
}
.page-about .flow__label {
  fill: var(--ice);
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 600;
}
.page-about .flow__sub {
  fill: var(--cool);
  font-family: var(--font-sans);
  font-size: 13px;
}

/* ---------- 资质 ---------- */
.page-about .compliance__list {
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}
.page-about .compliance__item {
  display: grid;
  gap: 4px;
  padding: 14px 0;
  border-top: 1px solid var(--ab-line-soft);
}
.page-about .compliance__item:last-child {
  border-bottom: 1px solid var(--ab-line-soft);
}
.page-about .compliance__key {
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--steel);
}
.page-about .compliance__val {
  font-size: 16px;
  line-height: 1.6;
  color: var(--ink);
}
.page-about .compliance__item:nth-child(2) .compliance__val,
.page-about .compliance__item:nth-child(4) .compliance__val {
  font-family: var(--font-num);
  letter-spacing: 0.02em;
}

/* ---------- 合作生态 ---------- */
.page-about .partner-grid {
  display: grid;
  gap: 1px;
  margin-top: 28px;
  background: var(--line);
  border: 1px solid var(--line);
}
.page-about .partner-card {
  padding: 22px 20px;
  background: var(--abyss);
  border-left: 2px solid transparent;
  transition: background var(--t-fast), border-color var(--t-fast), transform var(--t-fast);
}
.page-about .partner-card:hover,
.page-about .partner-card:focus-within {
  background: var(--deck);
  border-left-color: var(--lime);
  transform: translateY(-2px);
}
.page-about .partner-card__title {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 17px;
  color: var(--ice);
}
.page-about .partner-card__text {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--cool);
}

/* ---------- 理由 ---------- */
.page-about .reason-list {
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1px;
  background: var(--ab-line-soft);
  border: 1px solid var(--ab-line-soft);
}
.page-about .reason-item {
  padding: 22px 20px;
  background: var(--paper);
}
.page-about .reason-item__idx {
  display: block;
  font-family: var(--font-num);
  font-weight: 600;
  font-size: 15px;
  letter-spacing: 0.12em;
  color: var(--steel);
}
.page-about .reason-item__title {
  margin: 10px 0 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 18px;
  line-height: 1.4;
  color: var(--ink);
}
.page-about .reason-item__text {
  margin: 8px 0 0;
  font-size: 16px;
  line-height: 1.78;
  color: var(--ab-ink-soft);
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  display: grid;
  gap: 24px;
  padding: 28px 0 0;
  border-top: 2px solid var(--lime);
}
.page-about .about-next__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .team-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .partner-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .reason-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .timeline__item {
    grid-template-columns: 110px minmax(0, 1fr);
    align-items: start;
    gap: 20px;
    padding-right: 16px;
  }
  .page-about .timeline__item::before {
    top: 28px;
  }
}

@media (min-width: 960px) {
  .page-about {
    --ab-gap: 72px;
  }
  .page-about .about-hero {
    padding: 48px 0 56px;
  }
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 48px;
    align-items: end;
  }
  .page-about .about-split {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 56px;
    align-items: start;
  }
  .page-about .about-split--reverse .media-frame {
    order: -1;
  }
  .page-about .about-aside {
    padding-top: 34px;
  }
  .page-about .about-media--side {
    margin-top: 0;
    position: sticky;
    top: calc(var(--mast-h) + 24px);
  }
  .page-about .partner-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .reason-list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .about-next {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
    gap: 40px;
  }
}