/* ===== 品牌故事 / 团队与历程 ===== */
.page-about {
  --about-rail: 180px;
  --about-flow: clamp(56px, 7.5vw, 104px);
  color: var(--text);
  padding-bottom: clamp(72px, 10vw, 150px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(22px, 3.6vw, 44px) 0 clamp(44px, 6vw, 84px);
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(760px 420px at 4% -12%, rgba(0, 229, 255, 0.14), transparent 62%),
    radial-gradient(580px 360px at 100% 0%, rgba(168, 85, 247, 0.12), transparent 64%);
}

.page-about .breadcrumb {
  margin-bottom: clamp(22px, 3.2vw, 40px);
}

.page-about .about-hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 56px);
}

.page-about .about-hero-main .eyebrow {
  margin: 0 0 14px;
}

.page-about h1 {
  margin: 0 0 clamp(18px, 2.4vw, 26px);
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 5.4vw, 62px);
  line-height: 1.12;
  letter-spacing: -0.02em;
  max-width: 21ch;
  color: var(--text);
}

@supports (-webkit-background-clip: text) {
  .page-about h1 {
    background: linear-gradient(98deg, #e9f1ff 48%, #8ef4ff 84%, #00e5ff 108%);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    -webkit-text-fill-color: transparent;
  }
}

.page-about .about-lede {
  margin: 0;
  max-width: 62ch;
  font-size: clamp(15.5px, 1.3vw, 17px);
  line-height: 1.78;
  color: var(--muted);
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .fact {
  display: flex;
  flex-direction: column;
  gap: 7px;
  padding: 15px 16px;
  background: var(--hull);
  border-left: 2px solid transparent;
  transition: border-left-color 0.24s var(--ease), background-color 0.24s var(--ease);
}

.page-about .fact:hover {
  border-left-color: var(--cyan);
  background: var(--panel);
}

.page-about .fact-num {
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-size: clamp(21px, 2.6vw, 27px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--text);
}

.page-about .fact-num small {
  font-size: 0.56em;
  color: var(--cyan);
  margin-left: 2px;
}

.page-about .fact-label {
  font-size: 12px;
  line-height: 1.5;
  letter-spacing: 0.02em;
  color: var(--muted);
}

/* ---------- 主体框架 ---------- */
.page-about .about-shell {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4.5vw, 52px);
  padding-top: clamp(38px, 5.6vw, 84px);
}

/* ---------- 年份轴 ---------- */
.page-about .year-rail {
  display: flex;
  align-items: center;
  gap: 10px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
  overflow-x: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

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

.page-about .rail-title {
  flex: 0 0 auto;
  margin: 0;
  font-family: var(--font-num);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--muted);
}

.page-about .rail-list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .rail-link {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 7px 12px;
  border: 1px solid var(--line);
  background: var(--hull);
  color: var(--muted);
  text-decoration: none;
  white-space: nowrap;
  transition: border-color 0.22s var(--ease), color 0.22s var(--ease), transform 0.22s var(--ease);
}

.page-about .rail-link:hover,
.page-about .rail-link:focus-visible {
  border-color: var(--cyan);
  color: var(--text);
  transform: translateX(4px);
}

.page-about .rail-year {
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--text);
}

.page-about .rail-label {
  font-size: 11px;
  line-height: 1.4;
}

.page-about .rail-link:hover .rail-label,
.page-about .rail-link:focus-visible .rail-label {
  color: var(--cyan);
}

.page-about a:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

/* ---------- 章节流 ---------- */
.page-about .about-flow {
  display: flex;
  flex-direction: column;
  gap: var(--about-flow);
  min-width: 0;
}

.page-about .chapter {
  position: relative;
  padding-top: clamp(22px, 3vw, 34px);
  border-top: 1px solid var(--line);
  scroll-margin-top: calc(var(--header-h) + 28px);
}

.page-about .chapter-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: clamp(12px, 2vw, 22px);
  margin-bottom: clamp(20px, 3vw, 32px);
}

.page-about .chapter-num {
  flex: 0 0 auto;
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-size: clamp(30px, 5vw, 54px);
  font-weight: 700;
  line-height: 0.9;
  letter-spacing: -0.04em;
  color: var(--muted);
  opacity: 0.45;
  transition: color 0.4s var(--ease), opacity 0.4s var(--ease);
}

.page-about .chapter[data-visible] .chapter-num,
.page-about .chapter:target .chapter-num {
  color: var(--cyan);
  opacity: 1;
}

.page-about .chapter-title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(20px, 3.1vw, 36px);
  font-weight: 800;
  line-height: 1.24;
  letter-spacing: -0.02em;
  color: var(--text);
}

.page-about .chapter-body {
  display: flex;
  flex-direction: column;
  gap: clamp(16px, 2.2vw, 26px);
  min-width: 0;
}

.page-about .chapter-body > p {
  margin: 0;
  max-width: 68ch;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--muted);
}

.page-about .chapter-body > .chapter-lede {
  max-width: 58ch;
  font-size: clamp(16px, 1.5vw, 18px);
  line-height: 1.7;
  color: var(--text);
}

.page-about .chapter-body > p strong {
  color: var(--text);
  font-weight: 600;
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin: 0;
}

.page-about .img-frame {
  border: 1px solid var(--line);
  background: var(--hull);
  overflow: hidden;
}

.page-about .img-frame img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
}

.page-about .img-frame--square {
  max-width: 560px;
}

.page-about .about-figure figcaption {
  max-width: 62ch;
  padding-left: 12px;
  border-left: 2px solid var(--line);
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--muted);
}

/* ---------- 六步流程 ---------- */
.page-about .flow-list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .flow-step {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 4px 16px;
  padding: 17px 0;
  border-bottom: 1px solid var(--line);
  transition: border-color 0.24s var(--ease);
}

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

.page-about .flow-index {
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--cyan);
  padding-top: 2px;
}

.page-about .flow-name {
  font-size: 15px;
  font-weight: 700;
  color: var(--text);
  letter-spacing: 0.01em;
}

.page-about .flow-text {
  grid-column: 2;
  margin: 0;
  font-size: 14px;
  line-height: 1.74;
  color: var(--muted);
}

/* ---------- 团队分工 ---------- */
.page-about .team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .team-card {
  display: flex;
  flex-direction: column;
  gap: 11px;
  padding: clamp(20px, 2.6vw, 28px);
  background: var(--hull);
  transition: background-color 0.24s var(--ease);
}

.page-about .team-card:hover {
  background: var(--panel);
}

.page-about .team-role {
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-about .team-count {
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-size: clamp(30px, 4.2vw, 42px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--text);
}

.page-about .team-count small {
  font-size: 0.4em;
  font-weight: 400;
  color: var(--muted);
  margin-left: 4px;
}

.page-about .team-text {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.74;
  color: var(--muted);
}

.page-about .city-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 14px;
  padding: 16px 18px;
  border: 1px solid var(--line);
  background: var(--hull);
}

.page-about .city-tag {
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--cyan);
  border: 1px solid var(--line);
  padding: 4px 10px;
}

.page-about .city-text {
  flex: 1 1 260px;
  margin: 0;
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--muted);
}

/* ---------- 复核与指标 ---------- */
.page-about .metric-strip {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .metric {
  padding: clamp(20px, 3vw, 30px);
  background: var(--hull);
}

.page-about .metric-value {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 7px;
  margin: 0 0 12px;
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  line-height: 1;
}

.page-about .metric-num {
  font-size: clamp(32px, 5vw, 50px);
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--text);
}

.page-about .metric-num--alert {
  color: var(--magenta);
}

.page-about .metric-num--old {
  color: var(--muted);
}

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

.page-about .metric-arrow {
  font-size: 20px;
  color: var(--muted);
}

.page-about .metric-unit {
  font-size: 14px;
  color: var(--muted);
}

.page-about .metric-label {
  margin: 0;
  font-size: 13px;
  line-height: 1.62;
  color: var(--muted);
}

/* ---------- 里程碑 ---------- */
.page-about .milestone-img {
  border-color: var(--line);
}

.page-about .milestone-track {
  margin: 0;
  padding: 0 0 0 20px;
  list-style: none;
  border-left: 1px solid var(--line);
}

.page-about .milestone {
  position: relative;
  padding: 0 0 30px 0;
}

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

.page-about .milestone::before {
  content: "";
  position: absolute;
  left: -24px;
  top: 5px;
  width: 7px;
  height: 7px;
  background: var(--cyan);
  box-shadow: 0 0 0 3px rgba(0, 229, 255, 0.14);
  transition: background-color 0.24s var(--ease), box-shadow 0.24s var(--ease);
}

.page-about .milestone:hover::before {
  background: var(--mint);
  box-shadow: 0 0 0 4px rgba(61, 245, 165, 0.16);
}

.page-about .ms-year {
  display: inline-block;
  margin-bottom: 9px;
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--cyan);
}

.page-about .ms-title {
  margin: 0 0 7px;
  font-size: 15.5px;
  font-weight: 700;
  line-height: 1.42;
  color: var(--text);
}

.page-about .ms-text {
  margin: 0;
  max-width: 36ch;
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--muted);
}

/* ---------- 生态与合作 ---------- */
.page-about .eco-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .eco-item {
  position: relative;
  padding: 18px 20px 18px 22px;
  border: 1px solid var(--line);
  background: var(--panel);
  transition: border-color 0.24s var(--ease), transform 0.24s var(--ease);
}

.page-about .eco-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--line);
  transition: background-color 0.24s var(--ease);
}

.page-about .eco-item:hover,
.page-about .eco-item:focus-within {
  border-color: var(--cyan);
  transform: translateX(4px);
}

.page-about .eco-item:hover::before {
  background: var(--cyan);
}

.page-about .eco-name {
  display: block;
  margin-bottom: 8px;
  font-size: 14.5px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--text);
}

.page-about .eco-text {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--muted);
}

/* ---------- 后续计划 ---------- */
.page-about .plan-list {
  display: grid;
  gap: 20px;
  margin: 0;
  padding: 0 0 0 18px;
  list-style: none;
  border-left: 1px solid var(--line);
}

.page-about .plan-item {
  position: relative;
}

.page-about .plan-item::before {
  content: "";
  position: absolute;
  left: -21px;
  top: 8px;
  width: 6px;
  height: 6px;
  background: var(--muted);
  transition: background-color 0.24s var(--ease);
}

.page-about .plan-item:hover::before {
  background: var(--cyan);
}

.page-about .plan-text {
  margin: 0;
  max-width: 76ch;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--muted);
}

.page-about .plan-text strong {
  color: var(--text);
  font-weight: 600;
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  margin-top: clamp(64px, 9vw, 130px);
  padding-top: clamp(38px, 5.5vw, 70px);
  border-top: 1px solid var(--line);
}

.page-about .cta-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 3.4vw, 44px);
  padding: clamp(24px, 3.4vw, 44px);
  border: 1px solid var(--line);
  background:
    linear-gradient(142deg, rgba(0, 229, 255, 0.08), transparent 44%),
    linear-gradient(320deg, rgba(168, 85, 247, 0.08), transparent 46%),
    var(--hull);
}

.page-about .cta-inner .eyebrow {
  margin: 0 0 12px;
}

.page-about .cta-title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: clamp(20px, 2.6vw, 30px);
  font-weight: 800;
  line-height: 1.28;
  letter-spacing: -0.02em;
  color: var(--text);
}

.page-about .cta-text {
  margin: 0;
  max-width: 56ch;
  font-size: 14.5px;
  line-height: 1.76;
  color: var(--muted);
}

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

/* ---------- 平板与桌面 ---------- */
@media (min-width: 640px) {
  .page-about .metric-strip {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-about .team-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

  .page-about .flow-step {
    grid-template-columns: 44px 148px minmax(0, 1fr);
    align-items: baseline;
    gap: 4px 18px;
  }

  .page-about .flow-text {
    grid-column: 3;
  }
}

@media (min-width: 860px) {
  .page-about .milestone-track {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    padding: 0;
    border-left: 0;
    border-top: 1px solid var(--line);
  }

  .page-about .milestone {
    padding: 26px 24px 0 0;
    border-right: 1px solid var(--line);
  }

  .page-about .milestone:last-child {
    padding-right: 0;
    border-right: 0;
  }

  .page-about .milestone::before {
    left: 0;
    top: -4px;
  }

  .page-about .ms-text {
    max-width: 30ch;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.9fr) minmax(232px, 0.82fr);
    align-items: end;
  }

  .page-about .about-facts {
    grid-template-columns: 1fr;
  }

  .page-about .about-shell {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(48px, 6vw, 92px);
    padding-top: clamp(60px, 7vw, 100px);
  }

  .page-about .year-rail {
    display: block;
    position: sticky;
    top: calc(var(--header-h) + 40px);
    align-self: start;
    padding: 0;
    overflow: visible;
    border-bottom: 0;
  }

  .page-about .rail-title {
    display: block;
    margin: 0 0 22px;
  }

  .page-about .rail-list {
    flex-direction: column;
    gap: 0;
    border-left: 1px solid var(--line);
  }

  .page-about .rail-link {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 3px;
    margin-left: -1px;
    padding: 13px 0 13px 16px;
    border: 0;
    border-left: 2px solid transparent;
    background: transparent;
    white-space: normal;
  }

  .page-about .rail-link:hover,
  .page-about .rail-link:focus-visible {
    transform: none;
    border-left-color: var(--cyan);
    color: var(--text);
  }

  .page-about .cta-inner {
    grid-template-columns: minmax(0, 1.7fr) minmax(0, 1fr);
    align-items: center;
  }

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

@media (min-width: 1180px) {
  .page-about {
    --about-rail: 204px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition-duration: 0.01ms !important;
  }
}