.page-about {
  --about-rail: 160px;
  --about-rail-gap: clamp(24px, 4vw, 56px);
  --about-sec-gap: clamp(64px, 8vw, 112px);
  background: var(--frost);
  color: var(--ink);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(28px, 5vw, 64px) 0 clamp(40px, 6vw, 80px);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, var(--lake), rgba(31, 143, 166, 0) 78%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: -30%;
  right: -12%;
  width: min(560px, 70vw);
  aspect-ratio: 1;
  background: radial-gradient(circle, rgba(31, 143, 166, 0.16), rgba(31, 143, 166, 0) 68%);
  pointer-events: none;
}

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

.page-about .about-hero .display {
  max-width: 22ch;
  margin: 14px 0 20px;
}

.page-about .about-lede {
  max-width: 60ch;
  font-size: clamp(16px, 1.6vw, 18px);
  line-height: 1.8;
  color: #33475a;
  margin: 0;
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(32px, 4.5vw, 56px) 0 0;
  padding: 0;
  background: var(--hair);
  border: 1px solid var(--hair);
  border-radius: 4px;
  overflow: hidden;
}

.page-about .about-stat {
  background: #fff;
  padding: 18px 18px 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-about .about-stat dt {
  color: var(--muted);
  letter-spacing: 0.06em;
  font-size: 12px;
  line-height: 1.5;
}

.page-about .about-stat dd {
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: 6px;
  flex-wrap: wrap;
}

.page-about .about-stat__val {
  font-family: var(--font-mono);
  font-size: clamp(24px, 2.8vw, 32px);
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--deep);
  line-height: 1.1;
}

.page-about .about-stat__unit {
  font-size: 13px;
  color: var(--muted);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-sec {
  padding-bottom: var(--about-sec-gap);
}

.page-about .about-sec:first-of-type {
  padding-top: clamp(24px, 3vw, 40px);
}

.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
}

.page-about .about-rail {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding-top: 10px;
  border-top: 1px solid var(--hair);
}

.page-about .about-rail__num {
  font-family: var(--font-mono);
  font-size: clamp(20px, 2.2vw, 26px);
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--lake);
  line-height: 1;
}

.page-about .about-rail__label {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--muted);
}

.page-about .about-body {
  min-width: 0;
}

.page-about .about-body .title {
  margin: 0 0 clamp(16px, 2vw, 24px);
}

.page-about .about-body .prose {
  max-width: 66ch;
}

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

/* ---------- 旁注 ---------- */
.page-about .about-aside {
  margin: clamp(26px, 3.2vw, 40px) 0 0;
  padding: 18px 22px;
  border-left: 2px solid var(--lake);
  background: linear-gradient(90deg, rgba(31, 143, 166, 0.08), rgba(31, 143, 166, 0));
  color: #2c3f4f;
  font-size: 15px;
  line-height: 1.76;
  max-width: 66ch;
}

/* ---------- 年度节点轨道 ---------- */
.page-about .about-track {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(250px, 1fr);
  gap: 0;
  margin-top: clamp(26px, 3.4vw, 40px);
  padding-bottom: 20px;
  overflow-x: auto;
  overscroll-behavior-x: contain;
  scroll-snap-type: x proximity;
  scrollbar-width: thin;
  scrollbar-color: var(--hair) transparent;
}

.page-about .about-track:focus-visible {
  outline: 2px solid var(--lake);
  outline-offset: 6px;
  border-radius: 2px;
}

.page-about .about-node {
  position: relative;
  padding: 24px 22px 0 0;
  border-top: 1px solid var(--hair);
  scroll-snap-align: start;
}

.page-about .about-node::before {
  content: "";
  position: absolute;
  top: -5px;
  left: 0;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--batch);
  box-shadow: 0 0 0 4px rgba(255, 138, 61, 0.16);
}

.page-about .about-node__year {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: clamp(20px, 2.2vw, 26px);
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--lake);
  line-height: 1.1;
}

.page-about .about-node .title-sm {
  margin: 0 0 10px;
  font-size: 17px;
}

.page-about .about-node p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: #45586a;
  max-width: 30ch;
}

/* ---------- 用户场景 ---------- */
.page-about .about-roles {
  list-style: none;
  margin: clamp(26px, 3.4vw, 40px) 0 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .about-role {
  padding: 20px 0 22px;
  border-top: 1px solid var(--hair);
}

.page-about .about-role .title-sm {
  margin: 0 0 8px;
  font-size: 17px;
  color: var(--deep);
}

.page-about .about-role p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: #3d5163;
  max-width: 62ch;
}

/* ---------- 团队分工 ---------- */
.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  align-items: start;
}

.page-about .about-team__text .prose {
  margin-top: 0;
}

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

.page-about .about-team__figure .figure__cap {
  margin-top: 10px;
  font-size: 12.5px;
  color: var(--muted);
  line-height: 1.6;
}

.page-about .about-bar {
  display: flex;
  height: 14px;
  margin-top: clamp(30px, 3.6vw, 44px);
  border-radius: 2px;
  overflow: hidden;
  background: var(--hair);
}

.page-about .about-bar__seg {
  display: block;
  height: 100%;
}

.page-about .about-bar__seg--content {
  flex: 42;
  background: var(--lake);
}

.page-about .about-bar__seg--ops {
  flex: 18;
  background: var(--lake-soft);
}

.page-about .about-bar__seg--cs {
  flex: 26;
  background: var(--copper);
}

.page-about .about-bar-legend {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-about .about-bar-legend li {
  padding-top: 12px;
  border-top: 1px solid var(--hair);
}

.page-about .about-bar-legend__name {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 15px;
  font-weight: 600;
  color: var(--deep);
}

.page-about .about-bar-legend__num {
  display: block;
  margin-top: 6px;
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--lake);
}

.page-about .about-bar-legend p {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: #4a5d6d;
}

.page-about .about-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  display: inline-block;
  flex: none;
}

.page-about .about-dot--lake {
  background: var(--lake);
}

.page-about .about-dot--soft {
  background: var(--lake-soft);
}

.page-about .about-dot--copper {
  background: var(--copper);
}

/* ---------- 协作生态 ---------- */
.page-about .about-partners {
  list-style: none;
  margin: clamp(26px, 3.4vw, 40px) 0 0;
  padding: 0;
  display: grid;
  gap: 22px;
}

.page-about .about-partners li {
  padding: 20px 22px;
  background: var(--deep-2);
  border-radius: 4px;
  color: #d8e6ef;
}

.page-about .about-partners .tag {
  margin-bottom: 12px;
}

.page-about .about-partners .title-sm {
  margin: 0 0 8px;
  font-size: 17px;
  color: #fff;
}

.page-about .about-partners p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: rgba(216, 230, 239, 0.82);
}

.page-about .about-widefig {
  margin: clamp(30px, 4vw, 46px) 0 0;
}

.page-about .about-widefig .figure__cap {
  margin-top: 10px;
  font-size: 12.5px;
  color: var(--muted);
  line-height: 1.6;
}

/* ---------- 三步闭环 ---------- */
.page-about .about-steps {
  list-style: none;
  margin: clamp(28px, 3.6vw, 44px) 0 0;
  padding: 0;
}

.page-about .about-step {
  position: relative;
  margin-left: 9px;
  padding: 0 0 34px 46px;
  border-left: 2px solid var(--hair);
}

.page-about .about-step:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}

.page-about .about-step__idx {
  position: absolute;
  left: -14px;
  top: -2px;
  width: 26px;
  height: 26px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--deep);
  color: var(--lime);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.04em;
}

.page-about .about-step .title-sm {
  margin: 0 0 10px;
  font-size: 18px;
  color: var(--deep);
}

.page-about .about-step > p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: #3d5163;
  max-width: 62ch;
}

.page-about .about-step__gain {
  margin-top: 12px !important;
  padding-left: 12px;
  border-left: 2px solid var(--copper);
  font-size: 14px !important;
  color: #7a5b33 !important;
}

/* ---------- 安全与认可 ---------- */
.page-about .about-honors {
  list-style: none;
  margin: clamp(26px, 3.4vw, 38px) 0 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .about-honors li {
  display: flex;
  align-items: baseline;
  gap: 18px;
  padding: 16px 0;
  border-top: 1px solid var(--hair);
}

.page-about .about-honors__year {
  font-family: var(--font-mono);
  font-size: clamp(20px, 2.2vw, 26px);
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--copper);
  flex: none;
  min-width: 4ch;
}

.page-about .about-honors__text {
  font-size: 15.5px;
  line-height: 1.7;
  color: #33475a;
}

/* ---------- 收尾 ---------- */
.page-about .about-close {
  padding: clamp(40px, 5vw, 72px) 0 0;
  border-top: 1px solid var(--hair);
}

.page-about .about-close .title {
  margin: 0 0 14px;
}

.page-about .about-close__lede {
  max-width: 56ch;
  font-size: clamp(15.5px, 1.5vw, 17px);
  line-height: 1.78;
  color: #33475a;
  margin: 0 0 clamp(24px, 3vw, 36px);
}

.page-about .about-close__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: clamp(36px, 5vw, 64px);
}

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

.page-about .about-bleed .figure__cap {
  margin-top: 10px;
  font-size: 12.5px;
  color: var(--muted);
  line-height: 1.6;
}

.page-about .figure {
  margin-left: 0;
  margin-right: 0;
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-bar-legend {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 24px;
  }

  .page-about .about-partners {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }
}

@media (min-width: 860px) {
  .page-about .about-split {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: var(--about-rail-gap);
  }

  .page-about .about-rail {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
    padding-top: 14px;
  }

  .page-about .about-rail__label {
    letter-spacing: 0.14em;
  }
}

@media (min-width: 1180px) {
  .page-about .about-team {
    grid-template-columns: minmax(0, 1fr) 330px;
    gap: 36px;
  }

  .page-about .about-team__figure {
    margin-top: 4px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-track {
    scroll-snap-type: none;
  }

  .page-about .about-node::before {
    box-shadow: none;
  }
}