.page-about {
  --about-sec-gap: clamp(34px, 5vw, 72px);
  --about-rail-w: 152px;
  background: var(--night);
  color: var(--warm);
}

.page-about .crumb-sep {
  margin: 0 .45em;
  font-family: var(--font-data);
  color: var(--edge);
}

/* ---------- 页头 ---------- */

.page-about .about-hero {
  position: relative;
  padding: clamp(72px, 11vw, 136px) 0 clamp(30px, 4vw, 52px);
  background:
    radial-gradient(115% 95% at 84% -10%, rgba(200, 255, 61, .10), transparent 56%),
    radial-gradient(85% 75% at 4% 8%, rgba(53, 224, 192, .09), transparent 62%);
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  max-width: 15em;
  font-family: var(--font-display);
  font-size: clamp(34px, 5.4vw, 56px);
  line-height: 1.12;
  letter-spacing: .03em;
  color: var(--warm);
}

.page-about .about-lede {
  margin: clamp(18px, 2.4vw, 28px) 0 0;
  max-width: 42em;
  font-size: clamp(16px, 1.35vw, 18px);
  line-height: 1.82;
  color: var(--warm);
}

.page-about .about-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 12px clamp(18px, 3vw, 40px);
  margin: clamp(26px, 3.4vw, 42px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-facts li {
  display: flex;
  align-items: baseline;
  gap: 8px;
  font-family: var(--font-data);
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--mist);
}

.page-about .about-facts b {
  font-family: var(--font-data);
  font-size: clamp(20px, 2.2vw, 26px);
  font-weight: 400;
  color: var(--lime);
}

/* ---------- 首屏横图 ---------- */

.page-about .about-banner {
  padding: clamp(46px, 6.5vw, 96px) 0;
}

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

.page-about .banner-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 2px solid var(--edge);
  box-shadow: 8px 8px 0 var(--tunnel);
}

.page-about .banner-figure figcaption {
  margin-top: 14px;
  font-family: var(--font-data);
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist);
}

/* ---------- 滚动区骨架 ---------- */

.page-about .about-canvas {
  padding-bottom: clamp(48px, 7vw, 104px);
}

.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
}

@media (min-width: 900px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    column-gap: clamp(24px, 3.6vw, 60px);
  }
}

/* ---------- 左侧纵向刻度 ---------- */

.page-about .about-rail {
  display: none;
}

@media (min-width: 900px) {
  .page-about .about-rail {
    display: block;
  }

  .page-about .about-rail-inner {
    position: sticky;
    top: 128px;
  }
}

.page-about .rail-cap {
  margin: 0 0 10px 20px;
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--mist);
}

.page-about .rail-list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-left: 2px solid var(--edge);
}

.page-about .rail-list li {
  position: relative;
}

.page-about .rail-link {
  position: relative;
  display: block;
  padding: 12px 0 12px 20px;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .09em;
  color: var(--mist);
  text-decoration: none;
  transition: color .2s var(--ease), transform .2s var(--ease);
}

.page-about .rail-link::before {
  content: "";
  position: absolute;
  left: -2px;
  top: 19px;
  width: 10px;
  height: 2px;
  background: var(--edge);
  transition: width .2s var(--ease), background .2s var(--ease);
}

.page-about .rail-link:hover,
.page-about .rail-link:focus-visible {
  color: var(--lime);
  transform: translateX(2px);
}

.page-about .rail-link:hover::before,
.page-about .rail-link:focus-visible::before {
  width: 22px;
  background: var(--lime);
}

/* ---------- 内容段 ---------- */

.page-about .about-sec {
  padding: var(--about-sec-gap) 0;
  border-top: 2px solid var(--edge);
}

.page-about .about-sec:first-child {
  border-top: 0;
}

.page-about .sec-head {
  margin-bottom: clamp(22px, 3vw, 36px);
}

.page-about .sec-index {
  margin: 0 0 10px;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--cyan);
}

.page-about .sec-head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(26px, 3.6vw, 38px);
  line-height: 1.16;
  letter-spacing: .02em;
  color: var(--warm);
}

.page-about .sec-head p {
  margin: 12px 0 0;
  max-width: 46em;
  font-size: 16px;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .sec-body p {
  margin: 0 0 1.1em;
  max-width: 46em;
  font-size: 16px;
  line-height: 1.82;
  color: var(--warm);
}

.page-about .sec-body p:last-child {
  margin-bottom: 0;
}

.page-about .hl {
  color: var(--lime);
}

/* ---------- 工作流 ---------- */

.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 48px);
  align-items: start;
}

@media (min-width: 1080px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
  }
}

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

@media (min-width: 620px) {
  .page-about .flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(18px, 3vw, 34px);
  }
}

.page-about .flow-step {
  position: relative;
  padding: 26px 0 26px;
  border-top: 2px solid var(--edge);
  transition: border-color .24s var(--ease);
}

.page-about .flow-step::after {
  content: "";
  position: absolute;
  top: -7px;
  left: 0;
  width: 12px;
  height: 12px;
  background: var(--night);
  border: 2px solid var(--lime);
  transition: background .24s var(--ease);
}

.page-about .flow-step:hover {
  border-color: var(--lime);
}

.page-about .flow-step:hover::after {
  background: var(--lime);
}

.page-about .flow-step p.flow-num {
  margin: 0;
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--cyan);
}

.page-about .flow-step h3 {
  margin: 8px 0;
  font-family: var(--font-display);
  font-size: 20px;
  letter-spacing: .02em;
  color: var(--warm);
}

.page-about .flow-step p:not(.flow-num) {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--mist);
}

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

.page-about .split-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 2px solid var(--edge);
  box-shadow: 6px 6px 0 var(--tunnel);
}

.page-about .split-figure figcaption {
  margin-top: 12px;
  font-family: var(--font-data);
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist);
}

/* ---------- 团队 ---------- */

.page-about .team-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(16px, 2.6vw, 28px);
}

@media (min-width: 860px) {
  .page-about .team-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .team-card {
  padding-top: 18px;
  border-top: 2px solid var(--edge);
  transition: border-color .24s var(--ease);
}

.page-about .team-card:hover {
  border-color: var(--lime);
}

.page-about .team-num {
  display: block;
  font-family: var(--font-data);
  font-size: clamp(42px, 5vw, 64px);
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--lime);
}

.page-about .team-card h3 {
  margin: 12px 0 8px;
  font-family: var(--font-display);
  font-size: 18px;
  letter-spacing: .02em;
  color: var(--warm);
}

.page-about .team-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--mist);
}

.page-about .team-figure {
  margin: clamp(28px, 4vw, 48px) 0 0;
}

.page-about .team-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  max-height: 460px;
  object-fit: cover;
  border: 2px solid var(--edge);
  box-shadow: 6px 6px 0 var(--tunnel);
}

.page-about .team-figure figcaption {
  margin-top: 12px;
  font-family: var(--font-data);
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist);
}

/* ---------- 产出节奏 ---------- */

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

.page-about .kit-item {
  padding: clamp(18px, 2.4vw, 24px) 0;
  border-top: 2px solid var(--edge);
}

.page-about .kit-item:last-child {
  border-bottom: 2px solid var(--edge);
}

.page-about .kit-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 16px;
  margin-bottom: 8px;
}

.page-about .kit-name {
  font-family: var(--font-display);
  font-size: 20px;
  letter-spacing: .02em;
  color: var(--warm);
}

.page-about .kit-count {
  font-family: var(--font-data);
  font-size: 14px;
  letter-spacing: .06em;
  color: var(--lime);
}

.page-about .kit-item p {
  margin: 0;
  max-width: 46em;
  font-size: 15px;
  line-height: 1.74;
  color: var(--mist);
}

.page-about .rhythm-note {
  margin: clamp(22px, 3vw, 32px) 0 0;
  max-width: 46em;
  font-size: 15px;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .sec-cta {
  margin: clamp(24px, 3vw, 34px) 0 0;
}

/* ---------- 版本演进 ---------- */

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

.page-about .vers-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 20px 0;
  border-top: 2px solid var(--edge);
}

.page-about .vers-list .vers-item:last-child {
  border-bottom: 2px solid var(--edge);
}

@media (min-width: 720px) {
  .page-about .vers-item {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: clamp(16px, 3vw, 36px);
    align-items: baseline;
  }
}

.page-about .vers-stage {
  margin: 0;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--cyan);
}

.page-about .vers-item h3 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 19px;
  letter-spacing: .02em;
  color: var(--warm);
}

.page-about .vers-item p:not(.vers-stage) {
  margin: 0;
  max-width: 44em;
  font-size: 15px;
  line-height: 1.74;
  color: var(--mist);
}

/* ---------- 数据伙伴 ---------- */

.page-about .eco-list {
  display: grid;
  gap: 0;
}

.page-about .eco {
  border-top: 2px solid var(--edge);
  transition: border-color .24s var(--ease);
}

.page-about .eco:last-child {
  border-bottom: 2px solid var(--edge);
}

.page-about .eco summary {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 20px 0;
  font-family: var(--font-display);
  font-size: 19px;
  letter-spacing: .02em;
  color: var(--warm);
  list-style: none;
  cursor: pointer;
  transition: color .2s var(--ease);
}

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

.page-about .eco summary::after {
  content: "+";
  flex: none;
  font-family: var(--font-data);
  font-size: 18px;
  color: var(--lime);
}

.page-about .eco[open] summary::after {
  content: "–";
}

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

.page-about .eco-body {
  padding: 0 0 22px;
}

.page-about .eco-body p {
  margin: 0;
  max-width: 46em;
  font-size: 15px;
  line-height: 1.74;
  color: var(--mist);
}

/* ---------- 下一步入口 ---------- */

.page-about .next-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

@media (min-width: 700px) {
  .page-about .next-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1080px) {
  .page-about .next-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .next-link {
  position: relative;
  display: block;
  padding: 20px 18px 20px 24px;
  border: 2px solid var(--edge);
  background: var(--tunnel);
  color: var(--warm);
  text-decoration: none;
  transition: border-color .2s var(--ease), transform .2s var(--ease), box-shadow .2s var(--ease);
}

.page-about .next-link::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 6px;
  background: var(--edge);
  transition: background .2s var(--ease);
}

.page-about .next-link:hover,
.page-about .next-link:focus-visible {
  border-color: var(--lime);
  transform: translateY(-2px);
  box-shadow: 6px 6px 0 var(--edge);
}

.page-about .next-link:hover::before,
.page-about .next-link:focus-visible::before {
  background: var(--lime);
}

.page-about .next-link span {
  display: block;
  font-family: var(--font-display);
  font-size: 17px;
  letter-spacing: .02em;
}

.page-about .next-link em {
  display: block;
  margin-top: 8px;
  font-style: normal;
  font-size: 13px;
  line-height: 1.65;
  color: var(--mist);
}

/* ---------- 收束天际线 ---------- */

.page-about .about-skyline {
  height: 70px;
  margin-top: clamp(44px, 6vw, 80px);
}

.page-about .about-skyline svg {
  display: block;
  width: 100%;
  height: 100%;
}

.page-about .about-skyline path {
  fill: none;
  stroke: var(--lime);
  stroke-width: 1.5;
  vector-effect: non-scaling-stroke;
}

/* ---------- 窄屏微调 ---------- */

@media (max-width: 560px) {
  .page-about .about-hero h1 {
    max-width: none;
  }

  .page-about .about-facts {
    gap: 10px 18px;
  }

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

  .page-about .team-num {
    font-size: 46px;
  }

  .page-about .flow-step {
    padding: 22px 0;
  }

  .page-about .eco summary {
    font-size: 17px;
  }
}