.page-about {
  --about-gap: clamp(24px, 3.6vw, 44px);
  --about-rule: 1px solid var(--line);
}

/* ---------- 面包屑 ---------- */
.page-about .crumbs {
  padding-top: clamp(16px, 3vw, 26px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-top: clamp(22px, 4vw, 46px);
  padding-bottom: clamp(46px, 7vw, 96px);
  border-bottom: var(--about-rule);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -22%;
  right: -24%;
  width: min(780px, 90vw);
  height: 144%;
  transform: skewX(-11deg);
  background:
    linear-gradient(152deg, rgba(43, 227, 200, 0.16) 0%, rgba(43, 227, 200, 0.03) 44%, transparent 72%),
    repeating-linear-gradient(90deg, rgba(43, 227, 200, 0.07) 0 1px, transparent 1px 34px);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(30px, 4vw, 52px);
}

.page-about .about-hero__lead .index {
  margin: 0 0 clamp(14px, 2vw, 22px);
}

.page-about .about-hero__lead .lede {
  margin: clamp(16px, 2.4vw, 24px) 0 0;
  max-width: 34ch;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(24px, 3.4vw, 36px);
}

.page-about .about-hero__board {
  border: var(--about-rule);
  background: linear-gradient(180deg, rgba(19, 26, 46, 0.94), rgba(10, 13, 26, 0.92));
  padding: clamp(20px, 3vw, 30px);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(16px, 2.6vw, 26px);
  margin: 0;
}

.page-about .about-stat {
  border-top: var(--about-rule);
  padding-top: 12px;
}

.page-about .about-stat__label {
  margin: 0 0 8px;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--gray);
}

.page-about .about-stat__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(23px, 3.4vw, 31px);
  font-weight: 500;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--white);
}

.page-about .about-stat__num--cyan { color: var(--cyan); }
.page-about .about-stat__num--orange { color: var(--orange); }

.page-about .about-hero__note {
  margin: 24px 0 0;
  padding-top: 14px;
  border-top: var(--about-rule);
  font-size: 13px;
  line-height: 1.85;
  color: var(--gray);
}

/* ---------- 定位 ---------- */
.page-about .about-why {
  border-bottom: var(--about-rule);
}

.page-about .about-why__grid {
  display: grid;
  gap: var(--about-gap);
}

.page-about .about-why__head .index {
  margin: 0 0 14px;
}

.page-about .about-why__body .prose + .prose {
  margin-top: 18px;
}

.page-about .about-why__list {
  list-style: none;
  margin: clamp(24px, 3.4vw, 34px) 0 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .about-why__list li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  border-top: var(--about-rule);
  padding: 14px 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--white);
}

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

.page-about .about-why__list .index {
  color: var(--cyan);
  padding-top: 5px;
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  position: relative;
  border-bottom: var(--about-rule);
  background-image: linear-gradient(180deg, rgba(43, 227, 200, 0.05), transparent 42%);
}

.page-about .about-timeline__head {
  max-width: 860px;
  margin-bottom: clamp(28px, 4.4vw, 52px);
}

.page-about .about-timeline__head .index {
  margin: 0 0 14px;
}

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

.page-about .about-timeline__body {
  display: grid;
  gap: clamp(24px, 3.4vw, 38px);
}

.page-about .about-timeline__rail {
  display: flex;
  gap: 10px;
  overflow-x: auto;
  padding-bottom: 4px;
  scrollbar-width: none;
}

.page-about .about-timeline__rail::-webkit-scrollbar { display: none; }

.page-about .about-timeline__link {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--gray);
  text-decoration: none;
  border: var(--about-rule);
  padding: 6px 11px;
  transition: color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}

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

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

.page-about .about-stage {
  position: relative;
  padding: 0 0 clamp(30px, 4vw, 46px) 26px;
  border-left: var(--about-rule);
}

.page-about .about-stage::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 8px;
  width: 9px;
  height: 9px;
  background: var(--ink);
  border: 1px solid var(--cyan);
  transform: rotate(45deg);
}

.page-about .about-stage--now::before {
  background: var(--orange);
  border-color: var(--orange);
  box-shadow: 0 0 0 4px rgba(255, 106, 26, 0.14);
}

.page-about .about-stage__year {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--cyan);
}

.page-about .about-stage--now .about-stage__year { color: var(--orange); }

.page-about .about-stage__title {
  margin: 0 0 10px;
  color: var(--white);
}

.page-about .about-stage__text {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.9;
  color: var(--gray);
}

.page-about .about-stage--figure {
  padding-bottom: clamp(30px, 4vw, 46px);
}

.page-about .about-stage--figure::before { display: none; }

.page-about .about-timeline__figure {
  margin: 0;
}

.page-about .about-timeline__figure .media {
  border: var(--about-rule);
}

.page-about .about-timeline__figure figcaption {
  margin-top: 10px;
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  border-bottom: var(--about-rule);
  background:
    radial-gradient(120% 88% at 100% 0%, rgba(14, 59, 58, 0.6), transparent 62%),
    var(--ink);
}

.page-about .about-team__head {
  max-width: 840px;
}

.page-about .about-team__head .index {
  margin: 0 0 14px;
}

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

.page-about .about-flow {
  position: relative;
  display: grid;
  gap: 16px;
  margin-top: clamp(28px, 4.4vw, 48px);
}

.page-about .about-flow__node {
  position: relative;
  border: var(--about-rule);
  background: rgba(19, 26, 46, 0.72);
  padding: 20px 20px 22px;
  transition: border-color var(--t-fast) var(--ease), transform var(--t-fast) var(--ease);
}

.page-about .about-flow__node:hover,
.page-about .about-flow__node:focus-within {
  border-color: var(--cyan);
  transform: translateY(-2px);
}

.page-about .about-flow__step {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-about .about-flow__name {
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 600;
  color: var(--white);
}

.page-about .about-flow__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--gray);
}

.page-about .about-pace {
  display: grid;
  gap: 1px;
  margin-top: clamp(28px, 4.4vw, 46px);
  border: var(--about-rule);
  background: var(--line);
}

.page-about .about-pace__item {
  background: var(--ink-2);
  padding: 18px 20px;
}

.page-about .about-pace__num {
  margin: 0 0 8px;
  font-size: 17px;
  letter-spacing: -0.01em;
  color: var(--orange);
}

.page-about .about-pace__label {
  margin: 0;
  font-size: 13px;
  line-height: 1.8;
  color: var(--gray);
}

.page-about .about-ambient {
  margin: clamp(30px, 4.4vw, 52px) 0 0;
}

.page-about .about-ambient .media {
  border: var(--about-rule);
}

.page-about .about-ambient figcaption {
  margin-top: 10px;
}

/* ---------- 数据来源 ---------- */
.page-about .about-source {
  border-bottom: var(--about-rule);
}

.page-about .about-source__grid {
  display: grid;
  gap: var(--about-gap);
  align-items: start;
}

.page-about .about-source__text .index {
  margin: 0 0 14px;
}

.page-about .about-source__text .prose {
  margin-top: 18px;
}

.page-about .about-source__list {
  list-style: none;
  margin: clamp(24px, 3.4vw, 34px) 0 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .about-source__list li {
  display: grid;
  grid-template-columns: minmax(80px, auto) minmax(0, 1fr);
  gap: 14px;
  align-items: baseline;
  border-top: var(--about-rule);
  padding: 14px 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--gray);
}

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

.page-about .about-source__list .mono {
  color: var(--cyan);
  font-size: 13px;
  letter-spacing: -0.01em;
}

.page-about .about-source__figure {
  margin: 0;
  padding: clamp(14px, 2vw, 20px);
}

.page-about .about-source__figure .media {
  border: 1px solid rgba(43, 227, 200, 0.22);
}

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

/* ---------- 认可 ---------- */
.page-about .about-recog__panel {
  padding: clamp(26px, 4vw, 52px);
  color: var(--paper-ink);
}

.page-about .about-recog__panel .index {
  margin: 0 0 14px;
  color: var(--amber);
}

.page-about .about-recog__panel .title-l {
  color: var(--paper-ink);
}

.page-about .about-recog__panel .prose {
  margin-top: 18px;
  max-width: 60ch;
  color: var(--paper-ink);
}

.page-about .about-recog__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(18px, 2.6vw, 30px);
  margin-top: clamp(28px, 4vw, 44px);
}

.page-about .about-recog__item {
  border-top: 1px solid var(--paper-line);
  padding-top: 14px;
}

.page-about .about-recog__num {
  margin: 0 0 6px;
  font-size: clamp(22px, 3vw, 28px);
  font-weight: 500;
  letter-spacing: -0.02em;
  color: var(--amber);
}

.page-about .about-recog__label {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--paper-ink);
  opacity: 0.72;
}

/* ---------- 下一步 ---------- */
.page-about .about-next__inner {
  display: grid;
  gap: clamp(26px, 3.6vw, 40px);
  border-top: 2px solid var(--cyan);
  padding-top: clamp(26px, 3.6vw, 42px);
}

.page-about .about-next__inner .index {
  margin: 0 0 14px;
}

.page-about .about-next__inner .lede {
  margin: 16px 0 0;
  max-width: 46ch;
}

.page-about .about-next__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-content: start;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-pace {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 960px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    align-items: end;
    gap: clamp(40px, 5vw, 84px);
  }

  .page-about .about-why__grid {
    grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.18fr);
    gap: clamp(40px, 6vw, 96px);
  }

  .page-about .about-why__head h2 {
    position: sticky;
    top: 112px;
  }

  .page-about .about-timeline__body {
    grid-template-columns: 160px minmax(0, 1fr);
    gap: clamp(36px, 5vw, 76px);
  }

  .page-about .about-timeline__rail {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    position: sticky;
    top: 112px;
    align-self: start;
  }

  .page-about .about-timeline__link {
    border: 0;
    border-left: var(--about-rule);
    padding: 9px 0 9px 14px;
  }

  .page-about .about-timeline__link:hover,
  .page-about .about-timeline__link:focus-visible {
    border-color: var(--cyan);
    border-left-color: var(--cyan);
  }

  .page-about .about-flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0;
  }

  .page-about .about-flow__node {
    border-left: 0;
    padding: 22px 22px 26px;
  }

  .page-about .about-flow__node:first-child {
    border-left: var(--about-rule);
  }

  .page-about .about-flow__node::after {
    content: "";
    position: absolute;
    right: -4px;
    top: 38px;
    width: 7px;
    height: 7px;
    background: var(--ink);
    border: 1px solid var(--cyan);
    transform: rotate(45deg);
    z-index: 2;
  }

  .page-about .about-flow__node:last-child::after { display: none; }

  .page-about .about-pace {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-source__grid {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.94fr);
    gap: clamp(40px, 5.5vw, 80px);
  }

  .page-about .about-source__figure {
    position: sticky;
    top: 112px;
  }

  .page-about .about-recog__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-next__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
  }

  .page-about .about-next__actions {
    justify-content: flex-end;
  }
}

@media (min-width: 1280px) {
  .page-about .about-hero__stats {
    gap: 28px;
  }

  .page-about .about-stage {
    padding-left: 34px;
  }
}

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

  .page-about .about-flow__node:hover {
    transform: none;
  }
}