.page-about {
  --about-year-col: 120px;
  --about-tl-pad: 22px;
  position: relative;
}

.page-about .crumbs {
  padding-top: clamp(18px, 3vw, 32px);
}

/* ---------- 首屏 ---------- */

.page-about .about-intro {
  position: relative;
  padding: clamp(26px, 5vw, 60px) 0 clamp(40px, 6vw, 84px);
  overflow: hidden;
}

.page-about .about-intro::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(58% 62% at 16% 4%, rgba(52, 229, 200, 0.16), transparent 68%),
    radial-gradient(46% 56% at 94% 16%, rgba(240, 180, 41, 0.12), transparent 70%);
  pointer-events: none;
}

.page-about .about-intro > .container {
  position: relative;
  z-index: 1;
}

.page-about .about-intro__title {
  font-size: clamp(2rem, 6.6vw, 4.5rem);
  line-height: 1.04;
  font-weight: 900;
  letter-spacing: -0.02em;
  margin: 16px 0 clamp(22px, 3vw, 36px);
  max-width: 20ch;
}

.page-about .about-intro__body {
  align-items: start;
  row-gap: clamp(26px, 4vw, 48px);
}

.page-about .about-intro__body .lede {
  max-width: 36ch;
  margin: 0;
}

.page-about .about-metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px;
  background: var(--line);
  border: 2px solid var(--line);
  box-shadow: var(--shadow-soft);
}

.page-about .about-metrics .metric {
  background: var(--layer);
  padding: 16px 14px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .about-metrics .metric__value {
  font-family: var(--font-mono);
  font-size: clamp(1.35rem, 3vw, 1.9rem);
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-metrics .metric--cyan .metric__value {
  color: var(--cyan);
}

.page-about .about-metrics .metric__label {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--muted);
}

/* ---------- 章节公共 ---------- */

.page-about .section__head {
  margin-bottom: clamp(26px, 4vw, 48px);
}

.page-about .prose {
  max-width: 36ch;
  margin-bottom: 1.05em;
}

.page-about .prose:last-child {
  margin-bottom: 0;
}

/* ---------- 起点 ---------- */

.page-about .about-origin .grid-12 {
  row-gap: clamp(24px, 3vw, 40px);
}

.page-about .about-note {
  border-left: 2px solid var(--amber);
  padding: 4px 0 4px 18px;
}

.page-about .about-note__num {
  font-family: var(--font-mono);
  font-size: 1.7rem;
  line-height: 1;
  color: var(--amber);
  letter-spacing: -0.01em;
}

.page-about .about-note__text {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--muted);
  max-width: 28ch;
}

/* ---------- 数据体系 ---------- */

.page-about .about-data__grid {
  row-gap: clamp(26px, 4vw, 44px);
  align-items: start;
}

.page-about .about-data__list {
  margin: 26px 0 22px;
}

.page-about .about-data .data-bar {
  height: 14px;
  background: var(--deep);
  border: 2px solid var(--line);
}

.page-about .about-data .data-bar__fill {
  height: 100%;
  background: linear-gradient(90deg, var(--cyan), var(--mist));
}

.page-about .about-data .data-bar--amber .data-bar__fill {
  background: linear-gradient(90deg, var(--amber), var(--gold));
}

.page-about .about-data__figure {
  margin: 0;
  border: 2px solid var(--line);
  background: var(--deep);
  box-shadow: var(--shadow-hard);
}

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

/* ---------- 时间线 ---------- */

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

.page-about .about-tl {
  display: block;
}

.page-about .about-tl__item {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  padding: 24px 0 24px var(--about-tl-pad);
  border-left: 2px solid var(--line);
}

.page-about .about-tl__item::before {
  content: "";
  position: absolute;
  left: -7px;
  top: 30px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--amber);
  box-shadow: 0 0 0 4px var(--ink);
}

.page-about .about-tl__year {
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--amber);
  margin: 0;
}

.page-about .about-tl__body {
  max-width: 54ch;
}

.page-about .about-tl__body .h3 {
  margin-bottom: 10px;
}

.page-about .about-tl__body .prose {
  max-width: 54ch;
  margin-bottom: 0;
}

.page-about .about-tl__figure {
  margin: 8px 0;
  padding-left: var(--about-tl-pad);
  border-left: 2px solid var(--line);
  border-top: 0;
  border-right: 0;
  border-bottom: 0;
}

.page-about .about-tl__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 2px solid var(--line);
}

/* ---------- 团队 ---------- */

.page-about .about-team__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

.page-about .about-team__card {
  border: 2px solid var(--line);
  background: var(--layer);
  padding: 20px 18px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  transition: transform 240ms var(--ease), box-shadow 240ms var(--ease);
}

.page-about .about-team__card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-soft);
}

.page-about .about-team__num {
  font-family: var(--font-mono);
  font-size: clamp(1.9rem, 4vw, 2.6rem);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan);
  margin: 0;
}

.page-about .about-team__card .h3 {
  font-size: 1.05rem;
  margin: 0;
}

.page-about .about-team__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--muted);
}

.page-about .about-base {
  margin-top: clamp(30px, 4vw, 56px);
  row-gap: clamp(24px, 3vw, 40px);
  align-items: start;
}

.page-about .about-base__figure {
  margin: 0;
  border: 2px solid var(--line);
  background: var(--deep);
}

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

.page-about .about-base .h3 {
  margin-bottom: 12px;
}

/* ---------- 合作与认可 ---------- */

.page-about .about-partners .grid-12 {
  row-gap: clamp(26px, 4vw, 44px);
}

.page-about .about-facts {
  border-top: 2px solid var(--line);
}

.page-about .about-facts__row {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 18px;
  padding: 15px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-facts__k {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  letter-spacing: 0.06em;
  color: var(--amber);
  min-width: 5.5em;
}

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

/* ---------- 主线收束 ---------- */

.page-about .about-lanes {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2px;
  background: var(--line);
  border: 2px solid var(--line);
  margin-bottom: clamp(28px, 4vw, 48px);
}

.page-about .about-lane {
  background: var(--ink);
  padding: 22px 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.page-about .about-lane__idx {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--cyan);
}

.page-about .about-lane .h3 {
  font-size: 1.1rem;
  margin: 0;
}

.page-about .about-lane p {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--muted);
}

.page-about .about-final__foot {
  row-gap: clamp(22px, 3vw, 36px);
  align-items: start;
}

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

.page-about .about-final__actions .btn {
  min-height: 44px;
}

/* ---------- 响应式 ---------- */

@media (min-width: 720px) {
  .page-about .about-team__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-about .about-lanes {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 860px) {
  .page-about {
    --about-year-col: 132px;
    --about-tl-pad: 34px;
  }

  .page-about .about-tl__item {
    grid-template-columns: var(--about-year-col) minmax(0, 1fr);
    gap: 32px;
    padding-top: 32px;
    padding-bottom: 32px;
  }

  .page-about .about-tl__item::before {
    top: 38px;
  }

  .page-about .about-tl__figure {
    padding-left: calc(var(--about-year-col) + 34px);
    margin: 12px 0;
  }

  .page-about .about-intro__body .lede {
    font-size: 1.15rem;
  }
}

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

  .page-about .about-team__card:hover {
    transform: none;
    box-shadow: none;
  }
}