.page-about {
  background: var(--ink-0);
  color: var(--text);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-top: clamp(18px, 3vw, 34px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  left: -10%;
  right: -10%;
  top: -24%;
  height: 92%;
  background:
    radial-gradient(52% 70% at 18% 14%, rgba(53, 240, 208, .17), transparent 68%),
    radial-gradient(46% 62% at 86% 4%, rgba(255, 122, 43, .15), transparent 70%);
  pointer-events: none;
}

.page-about .about-hero .shell {
  position: relative;
  z-index: 1;
}

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

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(36px, 6.6vw, 88px);
  line-height: 1.02;
  letter-spacing: -.025em;
  margin: 14px 0 0;
  max-width: 17ch;
  text-wrap: balance;
}

.page-about .about-lede {
  max-width: 62ch;
  margin: clamp(18px, 2.4vw, 28px) 0 0;
  font-size: clamp(15px, 1.15vw, 17px);
  line-height: 1.78;
  color: var(--muted);
}

.page-about .hero-banner {
  position: relative;
  margin-top: clamp(26px, 4vw, 54px);
  overflow: hidden;
  clip-path: polygon(0 0, 100% 0, 100% 92%, 0 100%);
}

.page-about .hero-banner img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(.85) contrast(1.06);
}

.page-about .hero-banner::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 58%;
  background: linear-gradient(to top, rgba(6, 18, 15, .94), rgba(6, 18, 15, 0));
  pointer-events: none;
}

/* ---------- 通用内联链接 ---------- */
.page-about .inline-link {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 240, 208, .38);
  transition: border-color .14s var(--ease), color .14s var(--ease);
}

.page-about .inline-link:hover,
.page-about .inline-link:focus-visible {
  border-bottom-color: var(--cyan);
  color: var(--text);
}

/* ---------- 时间线主体 ---------- */
.page-about .journey-grid {
  display: grid;
  gap: clamp(24px, 3vw, 40px);
  margin-top: clamp(28px, 4vw, 48px);
}

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

.page-about .year-rail-title {
  margin: 0 0 14px;
  padding-left: 13px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--muted);
}

.page-about .year-rail-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  border-left: 1px solid var(--line);
}

.page-about .year-rail-link {
  display: flex;
  align-items: baseline;
  gap: 9px;
  margin-left: -1px;
  padding: 10px 12px;
  border-left: 2px solid transparent;
  color: var(--muted);
  font-size: 13.5px;
  line-height: 1.35;
  text-decoration: none;
  transition: color .14s var(--ease), border-color .14s var(--ease), background-color .14s var(--ease);
}

.page-about .year-rail-link:hover,
.page-about .year-rail-link:focus,
.page-about .year-rail-link:focus-visible {
  color: var(--cyan);
  border-left-color: var(--cyan);
  background: rgba(53, 240, 208, .07);
  outline: none;
}

.page-about .year-rail-num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 12px;
  color: var(--paper);
}

.page-about .journey-canvas {
  min-width: 0;
}

/* 横向坐标轴 */
.page-about .axis-wrap {
  overflow-x: auto;
  overscroll-behavior-x: contain;
  padding: 8px 0 22px;
  margin-bottom: clamp(22px, 3.2vw, 40px);
  border-bottom: 1px solid var(--line);
}

.page-about .axis-svg {
  display: block;
  width: 100%;
  min-width: 620px;
  height: auto;
}

/* 阶段 */
.page-about .stage {
  position: relative;
  padding-bottom: clamp(26px, 3.4vw, 44px);
  margin-bottom: clamp(26px, 3.4vw, 44px);
  border-bottom: 1px solid var(--line);
}

.page-about .stage:last-of-type {
  border-bottom: 0;
  margin-bottom: 0;
  padding-bottom: 0;
}

.page-about .stage-flag {
  display: block;
  width: 34px;
  height: 4px;
  margin-bottom: 14px;
  background: var(--cyan);
}

.page-about .stage:nth-of-type(2) .stage-flag { background: var(--slate); }
.page-about .stage:nth-of-type(3) .stage-flag { background: var(--orange); }
.page-about .stage:nth-of-type(4) .stage-flag { background: var(--cyan); }
.page-about .stage:nth-of-type(5) .stage-flag { background: var(--orange-soft); }

.page-about .stage-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: clamp(12px, 2vw, 26px);
}

.page-about .stage-year {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(40px, 6.2vw, 76px);
  line-height: .84;
  letter-spacing: -.03em;
  color: var(--paper);
}

.page-about .stage-title {
  margin: 0;
  max-width: 20ch;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(19px, 2.3vw, 29px);
  line-height: 1.22;
  letter-spacing: -.01em;
}

.page-about .stage-body {
  margin-top: 16px;
  max-width: 62ch;
}

.page-about .stage-body p {
  margin: 0 0 12px;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--muted);
}

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

.page-about .stage .num {
  color: var(--cyan);
}

.page-about .stage > .tag-slab {
  margin-top: 18px;
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  gap: clamp(24px, 3.4vw, 46px);
  margin-top: clamp(24px, 3.4vw, 40px);
}

.page-about .team-copy p + p {
  margin-top: 16px;
}

.page-about .team-facts {
  list-style: none;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px 18px;
}

.page-about .team-facts li {
  padding-top: 12px;
  border-top: 1px solid var(--line);
  font-size: 13.5px;
  line-height: 1.5;
  color: var(--muted);
}

.page-about .team-facts .num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 24px;
  color: var(--text);
  border-bottom: 2px solid var(--cyan);
  padding-bottom: 3px;
  width: fit-content;
  margin-bottom: 8px;
}

.page-about .team-figure,
.page-about .next-figure {
  margin: 0;
}

.page-about .team-figure img,
.page-about .next-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius-md);
}

.page-about .img-caption {
  margin-top: 10px;
  font-family: var(--font-serif);
  font-size: 13px;
  line-height: 1.65;
  color: var(--muted);
}

.page-about .img-frame + img + .img-caption {
  padding-left: 12px;
  border-left: 2px solid var(--paper-2);
}

/* ---------- 流程 ---------- */
.page-about .flow-list {
  list-style: none;
  margin: clamp(26px, 3.6vw, 44px) 0 0;
  padding: 0;
  display: grid;
  gap: clamp(18px, 2.4vw, 30px);
}

.page-about .flow-item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: clamp(12px, 1.8vw, 22px);
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.page-about .flow-idx {
  padding-top: 5px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .08em;
  color: var(--orange);
}

.page-about .flow-item h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(17px, 1.8vw, 21px);
  line-height: 1.3;
}

.page-about .flow-item p {
  margin: 0;
  max-width: 48ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 覆盖范围 ---------- */
.page-about .cov-stats {
  list-style: none;
  margin: clamp(24px, 3.4vw, 42px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(20px, 2.8vw, 34px);
}

.page-about .cov-stats .stat-num {
  display: block;
  width: fit-content;
  padding-bottom: 7px;
  border-bottom: 3px solid var(--cyan);
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(28px, 4.4vw, 54px);
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--text);
}

.page-about .cov-stats .stat-num--hot {
  border-bottom-color: var(--orange);
  color: var(--orange-soft);
}

.page-about .cov-stats .stat-label {
  display: block;
  margin-top: 12px;
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .coverage-note {
  margin-top: clamp(28px, 4vw, 46px);
  padding-top: clamp(22px, 3vw, 32px);
  border-top: 1px solid var(--line);
  display: grid;
  gap: 16px;
}

@media (min-width: 820px) {
  .page-about .coverage-note {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    gap: clamp(28px, 4vw, 56px);
  }
}

/* ---------- 下一步 ---------- */
.page-about .next-grid {
  display: grid;
  gap: clamp(26px, 3.6vw, 48px);
  margin-top: clamp(24px, 3.4vw, 42px);
}

.page-about .next-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(20px, 2.8vw, 30px);
}

.page-about .next-item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: clamp(12px, 1.8vw, 20px);
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.page-about .next-idx {
  padding-top: 4px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .08em;
  color: var(--cyan);
}

.page-about .next-item h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(17px, 1.8vw, 21px);
  line-height: 1.3;
}

.page-about .next-item p {
  margin: 0;
  max-width: 46ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 尾部导览 ---------- */
.page-about .about-forward {
  border-top: 1px solid var(--line);
}

.page-about .about-forward .section-title {
  margin-bottom: clamp(14px, 2vw, 22px);
}

.page-about .about-forward p {
  max-width: 74ch;
  margin: 0;
  font-size: 15.5px;
  line-height: 1.95;
  color: var(--muted);
}

.page-about .about-forward a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 240, 208, .38);
  transition: border-color .14s var(--ease), color .14s var(--ease);
}

.page-about .about-forward a:hover,
.page-about .about-forward a:focus-visible {
  border-bottom-color: var(--cyan);
  color: var(--text);
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .team-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-about .flow-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(26px, 4vw, 52px);
  }
}

@media (min-width: 880px) {
  .page-about .team-grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, .92fr);
    align-items: start;
  }

  .page-about .next-grid {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, .98fr);
    align-items: start;
  }

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

@media (min-width: 980px) {
  .page-about .journey-grid {
    grid-template-columns: 176px minmax(0, 1fr);
    gap: clamp(36px, 4.6vw, 68px);
  }

  .page-about .year-rail {
    display: block;
    position: sticky;
    top: 108px;
    align-self: start;
  }

  .page-about .stage-head {
    flex-wrap: nowrap;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .year-rail-link,
  .page-about .inline-link,
  .page-about .about-forward a {
    transition: none;
  }
}