.page-about {
  --about-hair: rgba(127, 231, 245, 0.16);
  --about-hair-warm: rgba(255, 138, 61, 0.2);
  --about-rail: 168px;
  --about-narrow: 720px;
  display: block;
  overflow-x: hidden;
  background-image:
    radial-gradient(120% 55% at 8% -6%, rgba(34, 211, 238, 0.13), transparent 62%),
    radial-gradient(85% 45% at 102% 10%, rgba(255, 138, 61, 0.09), transparent 58%);
  background-repeat: no-repeat;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: clamp(88px, 13vh, 148px) 0 clamp(34px, 6vh, 62px);
}

.page-about .about-hero-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 5vw, 54px);
  align-items: start;
}

.page-about .about-hero-copy .eyebrow {
  margin: 18px 0 0;
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(31px, 6vw, 58px);
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--paper);
  margin: 16px 0 20px;
  max-width: 16em;
}

.page-about .about-hero h1 .hl {
  background-image: linear-gradient(100deg, var(--cyan), var(--lime) 72%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.page-about .about-hero .lede {
  max-width: 60ch;
  color: rgba(244, 241, 234, 0.8);
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  margin: 0 0 26px;
}

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

.page-about .about-hero-frame {
  padding: clamp(22px, 3.6vw, 34px);
  border-radius: var(--radius-l);
  border: 1px solid var(--about-hair);
  background-image: linear-gradient(160deg, rgba(18, 41, 63, 0.96), rgba(11, 27, 43, 0.9));
  box-shadow: 0 34px 74px -46px rgba(0, 0, 0, 0.95);
}

.page-about .frame-label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--fog);
}

.page-about .frame-num {
  margin: 8px 0 20px;
  font-family: var(--font-mono);
  font-size: clamp(42px, 9vw, 62px);
  line-height: 1;
  letter-spacing: 0.04em;
  color: var(--cyan);
  text-shadow: 0 0 34px rgba(34, 211, 238, 0.35);
}

.page-about .frame-stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .frame-stats li {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding-top: 10px;
  border-top: 1px solid var(--about-hair);
  font-size: 14px;
  color: var(--fog);
}

.page-about .frame-stats .num {
  font-family: var(--font-mono);
  font-size: 18px;
  letter-spacing: 0.04em;
  color: var(--paper);
}

/* ---------- 主体网格 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(30px, 5vw, 54px);
  padding-bottom: clamp(64px, 10vh, 118px);
}

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

/* ---------- 章节锚点 ---------- */
.page-about .about-rail {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding: 2px 0 8px;
  scrollbar-width: none;
}

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

.page-about .about-rail a {
  flex: 0 0 auto;
  white-space: nowrap;
  padding: 8px 15px;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(148, 167, 184, 0.22);
  color: var(--fog);
  font-size: 13px;
  letter-spacing: 0.06em;
  text-decoration: none;
  transition: color 200ms var(--ease), border-color 200ms var(--ease), background-color 200ms var(--ease);
}

.page-about .about-rail a:hover,
.page-about .about-rail a:focus-visible {
  color: var(--cyan-mist);
  border-color: rgba(34, 211, 238, 0.5);
}

.page-about .about-rail a.is-active {
  color: var(--ink);
  background-color: var(--lime);
  border-color: var(--lime);
}

/* ---------- 面板序列 ---------- */
.page-about .about-flow {
  display: grid;
  gap: clamp(44px, 8vh, 92px);
}

.page-about .story-panel {
  position: relative;
  padding: clamp(24px, 4vw, 42px);
  border-radius: var(--radius-l);
  border: 1px solid rgba(127, 231, 245, 0.12);
  background-image: linear-gradient(170deg, rgba(18, 41, 63, 0.86), rgba(11, 27, 43, 0.7));
}

.page-about .story-panel .eyebrow {
  margin: 0;
}

.page-about .story-panel .section-title {
  margin: 12px 0 16px;
  max-width: 24em;
}

.page-about .story-panel .body-text {
  max-width: 68ch;
  margin: 0 0 14px;
  color: rgba(244, 241, 234, 0.82);
  line-height: 1.8;
}

.page-about .story-panel .body-text:last-child {
  margin-bottom: 0;
}

.page-about .story-figure {
  margin: 6px 0 26px;
  border-radius: var(--radius-m);
  overflow: hidden;
  border: 1px solid rgba(127, 231, 245, 0.14);
}

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

/* ---------- 起点区 ---------- */
.page-about .origin-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  align-items: start;
}

.page-about .origin-copy .body-text {
  margin-bottom: 14px;
}

.page-about .version-strip {
  display: grid;
  gap: 1px;
  background-color: rgba(127, 231, 245, 0.16);
  border-radius: var(--radius-m);
  overflow: hidden;
}

.page-about .version-row {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 16px 18px;
  background-color: rgba(11, 27, 43, 0.92);
}

.page-about .version-row .num-tag {
  align-self: flex-start;
}

.page-about .version-val {
  font-size: 14px;
  line-height: 1.7;
  color: rgba(244, 241, 234, 0.78);
}

.page-about .version-row--link {
  background-color: rgba(18, 41, 63, 0.95);
}

.page-about .version-link {
  color: var(--cyan-mist);
  font-size: 14px;
  text-decoration: none;
  border-bottom: 1px solid rgba(127, 231, 245, 0.4);
  padding-bottom: 2px;
  align-self: flex-start;
}

.page-about .version-link:hover,
.page-about .version-link:focus-visible {
  color: var(--lime);
  border-bottom-color: var(--lime);
}

/* ---------- 产出流程 ---------- */
.page-about .method-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
  align-items: start;
}

.page-about .method-copy .body-text {
  margin-bottom: 14px;
}

.page-about .method-grid .story-figure {
  margin: 0;
}

/* ---------- 团队分工 ---------- */
.page-about .team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: 22px;
}

.page-about .team-card {
  padding: 20px 20px 22px;
  border-radius: var(--radius-m);
  background-color: rgba(27, 58, 85, 0.42);
  border-top: 2px solid rgba(127, 231, 245, 0.28);
}

.page-about .team-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(32px, 5vw, 44px);
  line-height: 1;
  letter-spacing: 0.04em;
  color: var(--paper);
  margin-bottom: 10px;
}

.page-about .team-card:first-child .team-num {
  color: var(--cyan);
}

.page-about .team-card:nth-child(2) .team-num {
  color: var(--orange);
}

.page-about .team-title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .team-text {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--fog);
}

/* ---------- 里程碑时间轴 ---------- */
.page-about .timeline {
  list-style: none;
  position: relative;
  max-width: var(--about-narrow);
  margin: 8px auto 0;
  padding: 0 0 0 30px;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background-image: linear-gradient(180deg, var(--cyan), rgba(34, 211, 238, 0.22) 64%, var(--orange));
}

.page-about .tl-item {
  position: relative;
  padding-bottom: 30px;
}

.page-about .tl-item:last-child {
  padding-bottom: 0;
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 5px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background-color: var(--ink);
  border: 2px solid var(--cyan);
}

.page-about .tl-item:last-child::before {
  border-color: var(--orange);
  box-shadow: 0 0 0 4px rgba(255, 138, 61, 0.14);
}

.page-about .tl-year {
  margin: 0 0 4px;
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.1em;
  color: var(--cyan-mist);
}

.page-about .tl-item:last-child .tl-year {
  color: var(--amber);
}

.page-about .tl-title {
  margin: 0 0 6px;
  font-family: var(--font-serif);
  font-size: 19px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .tl-item .body-text {
  margin: 0;
  font-size: 15px;
}

/* ---------- 专题 ---------- */
.page-about .topic-band {
  display: flex;
  gap: 10px;
  overflow-x: auto;
  margin: 4px 0 22px;
  padding-bottom: 10px;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

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

.page-about .topic-pill {
  flex: 0 0 auto;
  scroll-snap-align: start;
  padding: 9px 18px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--about-hair-warm);
  background-color: rgba(255, 138, 61, 0.07);
  color: var(--amber);
  font-size: 14px;
  letter-spacing: 0.04em;
  text-decoration: none;
  transition: background-color 200ms var(--ease), color 200ms var(--ease), border-color 200ms var(--ease);
}

.page-about .topic-pill:hover,
.page-about .topic-pill:focus-visible {
  background-color: var(--orange);
  border-color: var(--orange);
  color: var(--ink);
}

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

.page-about .topic-item {
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  padding: 20px 0;
  border-top: 1px solid rgba(148, 167, 184, 0.16);
  scroll-margin-top: 130px;
}

.page-about .topic-item:last-child {
  border-bottom: 1px solid rgba(148, 167, 184, 0.16);
}

.page-about .topic-name {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 19px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--paper);
  padding-left: 14px;
  position: relative;
}

.page-about .topic-name::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 6px;
  height: 2px;
  background-color: var(--orange);
}

.page-about .topic-desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: rgba(244, 241, 234, 0.78);
}

.page-about .topic-figure {
  margin-top: 26px;
}

/* ---------- 合作生态 ---------- */
.page-about .partner-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-top: 24px;
}

.page-about .partner-stat {
  padding: 20px 22px;
  border-radius: var(--radius-m);
  background-color: rgba(27, 58, 85, 0.4);
  border-left: 2px solid rgba(255, 138, 61, 0.5);
}

.page-about .partner-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(30px, 4.6vw, 40px);
  line-height: 1;
  letter-spacing: 0.04em;
  color: var(--amber);
  margin-bottom: 8px;
}

.page-about .partner-label {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(244, 241, 234, 0.78);
}

/* ---------- 使用规模 ---------- */
.page-about .reach-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin-top: 22px;
  border-radius: var(--radius-m);
  overflow: hidden;
  background-color: rgba(127, 231, 245, 0.16);
}

.page-about .reach-cell {
  padding: 22px 22px 24px;
  background-color: rgba(18, 41, 63, 0.92);
}

.page-about .reach-num {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: clamp(26px, 4vw, 36px);
  line-height: 1;
  letter-spacing: 0.04em;
  color: var(--paper);
}

.page-about .reach-num span {
  font-size: 14px;
  letter-spacing: 0.06em;
  color: var(--fog);
  margin-left: 4px;
}

.page-about .reach-label {
  margin: 0;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--fog);
}

/* ---------- 收尾行动 ---------- */
.page-about .about-cta {
  margin-top: clamp(52px, 8vh, 88px);
  padding: clamp(26px, 4.4vw, 46px);
  border-radius: var(--radius-l);
  border: 1px solid rgba(127, 231, 245, 0.16);
  background-image: linear-gradient(120deg, rgba(34, 211, 238, 0.13), rgba(182, 255, 60, 0.09) 48%, rgba(255, 138, 61, 0.13));
}

.page-about .about-cta .section-title {
  margin: 0 0 12px;
  max-width: 24em;
}

.page-about .about-cta .body-text {
  max-width: 62ch;
  margin: 0 0 24px;
  color: rgba(244, 241, 234, 0.82);
  line-height: 1.8;
}

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

/* ---------- 平板及以上 ---------- */
@media (min-width: 720px) {
  .page-about .team-grid {
    grid-template-columns: 1.35fr 1fr 0.85fr;
  }

  .page-about .topic-item {
    grid-template-columns: minmax(0, 0.62fr) minmax(0, 1.38fr);
    gap: 26px;
    align-items: baseline;
  }

  .page-about .partner-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }

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

@media (min-width: 900px) {
  .page-about .about-hero-inner {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
    align-items: center;
  }

  .page-about .origin-split {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 1fr);
    gap: 34px;
  }

  .page-about .method-grid {
    grid-template-columns: minmax(0, 1.32fr) minmax(0, 1fr);
    gap: 38px;
  }

  .page-about .timeline {
    padding-left: 50px;
  }

  .page-about .tl-item::before {
    left: -50px;
  }

  .page-about .tl-item:nth-child(even) {
    margin-left: 42px;
  }
}

/* ---------- 桌面：左侧章节列 + 错位面板 ---------- */
@media (min-width: 1024px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(38px, 5vw, 76px);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 124px;
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding: 0;
  }

  .page-about .about-rail a {
    border: 0;
    border-left: 2px solid rgba(148, 167, 184, 0.24);
    border-radius: 0;
    padding: 10px 0 10px 16px;
    background-color: transparent;
    font-size: 14px;
  }

  .page-about .about-rail a.is-active {
    background-color: transparent;
    color: var(--lime);
    border-left-color: var(--lime);
  }

  .page-about .story-panel--shift {
    margin-left: clamp(22px, 4vw, 58px);
  }
}

/* ---------- 减弱动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail a,
  .page-about .topic-pill,
  .page-about .version-link {
    transition: none;
  }
}