.page-about {
  --about-axis: 7px;
  --about-node: 15px;
  overflow-x: clip;
  padding-bottom: clamp(56px, 8vw, 112px);
}

/* ---------- 面包屑 ---------- */
.page-about .crumbs {
  margin-top: clamp(20px, 3vw, 36px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-block: clamp(36px, 7vw, 88px) clamp(28px, 5vw, 64px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(110% 78% at 82% 4%, rgba(47, 227, 198, 0.14), transparent 62%),
    radial-gradient(88% 66% at 6% 96%, rgba(255, 122, 51, 0.1), transparent 66%);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  display: grid;
  gap: clamp(32px, 5vw, 64px);
  align-items: center;
}

.page-about .about-hero__copy {
  max-width: 62ch;
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 200;
  font-size: clamp(36px, 7.2vw, 82px);
  line-height: 1.05;
  letter-spacing: -0.025em;
  color: var(--white);
  margin: 16px 0 22px;
  max-width: 18ch;
}

.page-about .about-hero__lead {
  color: var(--muted);
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.78;
  margin: 0 0 28px;
  max-width: 60ch;
}

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

.page-about .about-hero__visual {
  position: relative;
  padding: clamp(18px, 3vw, 32px) clamp(14px, 2.4vw, 26px) clamp(10px, 2vw, 18px);
  border: 1px solid var(--grid);
  background:
    radial-gradient(90% 72% at 72% 8%, rgba(47, 227, 198, 0.16), transparent 60%),
    linear-gradient(180deg, rgba(13, 42, 68, 0.92), rgba(6, 23, 38, 0.96));
  overflow: hidden;
}

.page-about .about-hero__visual::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(28, 69, 96, 0.45) 1px, transparent 1px),
    linear-gradient(90deg, rgba(28, 69, 96, 0.45) 1px, transparent 1px);
  background-size: 28px 28px;
  opacity: 0.4;
  pointer-events: none;
}

.page-about .about-hero__chart {
  position: relative;
  z-index: 1;
  display: block;
  width: 100%;
  height: auto;
  max-height: 340px;
}

.page-about .hero-chart__grid line {
  stroke: var(--grid);
  stroke-width: 1;
  opacity: 0.55;
}

.page-about .hero-chart__bar {
  fill: var(--aurora);
  opacity: 0.3;
  transition: opacity var(--dur) var(--ease);
}

.page-about .hero-chart__bar--now {
  fill: var(--lime);
  opacity: 0.85;
}

.page-about .about-hero__visual:hover .hero-chart__bar {
  opacity: 0.62;
}

.page-about .hero-chart__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  fill: var(--muted);
}

.page-about .hero-chart__label--end {
  fill: var(--aurora-soft);
}

.page-about .about-hero__visual-note {
  position: relative;
  z-index: 1;
  margin: 10px 0 0;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--muted);
  text-align: right;
}

/* ---------- 章节骨架 ---------- */
.page-about .about-chapter {
  padding-block: clamp(44px, 7vw, 100px);
}

.page-about .rule-band {
  width: 100%;
  height: 4px;
  margin-bottom: clamp(26px, 4vw, 48px);
  background: linear-gradient(90deg, var(--glow) 0%, var(--aurora) 46%, var(--amber) 100%);
}

.page-about .section__index {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.24em;
  color: var(--muted);
  margin-bottom: 14px;
  transition: color 420ms var(--ease);
}

.page-about .section__index.is-visible {
  color: var(--lime);
}

.page-about .section__title {
  font-family: var(--font-display);
  font-weight: 200;
  font-size: clamp(29px, 4.4vw, 56px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--white);
  margin: 0 0 14px;
  max-width: 18ch;
}

.page-about .section__lead {
  margin: 0;
  max-width: 64ch;
  color: var(--muted);
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.78;
}

.page-about .section__head {
  margin-bottom: clamp(28px, 4vw, 50px);
}

/* ---------- 通用链接 / 图形 ---------- */
.page-about .link-more {
  display: inline-block;
  color: var(--aurora);
  text-decoration: none;
  border-bottom: 1px solid var(--grid);
  padding-bottom: 3px;
  font-size: 15px;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

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

.page-about .about-figure {
  margin: 0 0 clamp(28px, 4vw, 46px);
  border: 1px solid var(--grid);
  background: var(--panel);
  overflow: hidden;
}

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

.page-about .media__caption {
  padding: 12px 16px 14px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 01 时间轴 ---------- */
.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: var(--about-axis);
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--amber), var(--aurora));
  opacity: 0.8;
}

.page-about .tl-node {
  position: relative;
  padding-left: 40px;
  padding-bottom: clamp(22px, 3.4vw, 38px);
  outline-offset: 6px;
}

.page-about .tl-node::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  width: var(--about-node);
  height: var(--about-node);
  background: var(--ink);
  border: 1px solid var(--amber);
  transition: background 260ms var(--ease), border-color 260ms var(--ease), transform 260ms var(--ease);
}

.page-about .tl-node:hover::before,
.page-about .tl-node:focus-within::before {
  background: var(--aurora);
  border-color: var(--aurora);
  transform: scale(1.12);
}

.page-about .tl-node:focus-visible {
  outline: 2px solid var(--lime);
}

.page-about .tl-node__mark {
  display: block;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--lime);
  margin-bottom: 8px;
}

.page-about .tl-node__title {
  margin: 0 0 8px;
  font-size: clamp(18px, 2.1vw, 23px);
  font-weight: 600;
  line-height: 1.32;
  color: var(--white);
}

.page-about .tl-node__text {
  margin: 0;
  max-width: 60ch;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.75;
}

.page-about .tl-node__more {
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  transition: max-height 320ms var(--ease), opacity 240ms var(--ease), margin-top 320ms var(--ease);
}

.page-about .tl-node:hover .tl-node__more,
.page-about .tl-node:focus-within .tl-node__more {
  max-height: 320px;
  opacity: 1;
  margin-top: 12px;
}

.page-about .tl-node__more p {
  margin: 0;
  padding-left: 14px;
  border-left: 2px solid var(--grid);
  color: var(--aurora-soft);
  font-size: 14.5px;
  line-height: 1.72;
  max-width: 58ch;
}

/* ---------- 02 标签体系 ---------- */
.page-about .taxonomy {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
}

.page-about .taxonomy__ladder {
  border-top: 1px solid var(--grid);
}

.page-about .tax-step {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 4px 22px;
  padding: clamp(18px, 3vw, 28px) 0;
  border-bottom: 1px solid var(--grid);
  transition: padding-left 240ms var(--ease), border-color 240ms var(--ease);
}

.page-about .tax-step:hover,
.page-about .tax-step:focus-within {
  padding-left: 14px;
  border-color: var(--aurora);
}

.page-about .tax-step__num {
  grid-row: 1 / span 2;
  font-family: var(--font-mono);
  font-size: clamp(30px, 5vw, 50px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--lime);
}

.page-about .tax-step__title {
  margin: 0;
  font-size: clamp(17px, 2vw, 21px);
  font-weight: 600;
  color: var(--white);
  line-height: 1.3;
}

.page-about .tax-step__text {
  grid-column: 2;
  margin: 0;
  max-width: 48ch;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.72;
}

.page-about .taxonomy__note {
  position: relative;
  padding: clamp(22px, 3vw, 32px) clamp(20px, 3vw, 30px) clamp(20px, 3vw, 28px) clamp(26px, 3.4vw, 36px);
  border: 1px solid var(--grid);
  background: linear-gradient(160deg, rgba(13, 42, 68, 0.92), rgba(6, 23, 38, 0.96));
}

.page-about .taxonomy__note::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 3px;
  background: linear-gradient(180deg, var(--amber), var(--aurora));
}

.page-about .taxonomy__note-title {
  margin: 0 0 14px;
  font-size: clamp(18px, 2.1vw, 22px);
  font-weight: 600;
  line-height: 1.32;
  color: var(--white);
}

.page-about .taxonomy__note p {
  margin: 0 0 12px;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.75;
}

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

/* ---------- 03 团队 ---------- */
.page-about .team {
  display: grid;
  gap: clamp(26px, 4vw, 46px);
}

.page-about .about-team__media {
  margin-bottom: 0;
}

.page-about .team__roles {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .role {
  padding: clamp(18px, 2.4vw, 24px);
  border: 1px solid var(--grid);
  background: rgba(13, 42, 68, 0.56);
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .role:hover,
.page-about .role:focus-within {
  transform: translateY(-4px);
  border-color: var(--aurora);
}

.page-about .role__head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 8px;
}

.page-about .role__idx {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--aurora);
}

.page-about .role__title {
  margin: 0;
  font-size: 17px;
  font-weight: 600;
  color: var(--white);
}

.page-about .role__text {
  margin: 0;
  color: var(--muted);
  font-size: 14.5px;
  line-height: 1.72;
}

/* ---------- 04 城市与协作 ---------- */
.page-about .cities {
  display: grid;
  gap: clamp(26px, 4vw, 46px);
}

.page-about .cities__copy p {
  margin: 0 0 16px;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.78;
  max-width: 60ch;
}

.page-about .cities__stats {
  display: grid;
  gap: 12px;
  margin: 26px 0 24px;
}

.page-about .stat {
  padding: 16px 18px;
  border: 1px solid var(--grid);
  background: linear-gradient(150deg, rgba(10, 58, 71, 0.6), rgba(13, 42, 68, 0.5));
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .stat:hover {
  transform: translateY(-4px);
  border-color: var(--aurora);
}

.page-about .stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.4vw, 34px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--aurora);
  margin-bottom: 8px;
}

.page-about .stat__label {
  display: block;
  color: var(--muted);
  font-size: 13.5px;
  line-height: 1.55;
}

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

/* ---------- 05 服务节奏 ---------- */
.page-about .rhythm {
  display: grid;
  gap: 16px;
}

.page-about .rhythm__card {
  padding: clamp(20px, 2.6vw, 28px);
  border: 1px solid var(--grid);
  background: var(--panel);
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .rhythm__card:hover,
.page-about .rhythm__card:focus-within {
  transform: translateY(-4px);
  border-color: var(--aurora);
}

.page-about .rhythm__key {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--amber);
  margin-bottom: 12px;
}

.page-about .rhythm__title {
  margin: 0 0 10px;
  font-size: clamp(17px, 2vw, 20px);
  font-weight: 600;
  line-height: 1.3;
  color: var(--white);
}

.page-about .rhythm__text {
  margin: 0;
  color: var(--muted);
  font-size: 14.5px;
  line-height: 1.72;
}

.page-about .rhythm__foot {
  margin: clamp(26px, 4vw, 42px) 0 0;
  padding-top: clamp(18px, 3vw, 26px);
  border-top: 1px solid var(--grid);
  color: var(--muted);
  font-size: 15px;
  line-height: 1.78;
  max-width: 70ch;
}

.page-about .rhythm__foot a {
  color: var(--aurora);
  text-decoration: none;
  border-bottom: 1px solid var(--grid);
  padding-bottom: 2px;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .rhythm__foot a:hover,
.page-about .rhythm__foot a:focus-visible {
  color: var(--lime);
  border-color: var(--lime);
}

/* ---------- 响应式 ---------- */
@media (min-width: 600px) {
  .page-about .cities__stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

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

  .page-about .rhythm__card:nth-child(2) {
    margin-top: 26px;
  }

  .page-about .rhythm__card:nth-child(3) {
    margin-top: 52px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    gap: clamp(40px, 5.5vw, 80px);
  }

  .page-about .taxonomy {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .team {
    grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
    align-items: start;
  }

  .page-about .cities {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .team__roles {
    margin-top: 36px;
  }

  .page-about .cities__copy {
    margin-top: 28px;
  }

  .page-about .timeline {
    padding-left: clamp(0px, 3vw, 40px);
  }
}

@media (min-width: 1180px) {
  .page-about .taxonomy__note {
    margin-top: 44px;
  }

  .page-about .cities__copy {
    margin-top: 56px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: 1ms !important;
  }
}