.page-about {
  --about-axis: 70px;
  --about-line: rgba(18, 22, 28, 0.14);
  --about-notch: 2px 20px 2px 20px;
  background: var(--k-paper);
  color: var(--k-ink);
}

@media (min-width: 900px) {
  .page-about {
    --about-axis: 104px;
  }
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(22px, 5vw, 48px) 0 0;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -220px;
  right: -160px;
  width: min(620px, 92vw);
  height: min(620px, 92vw);
  border-radius: 50%;
  background: radial-gradient(circle, rgba(107, 224, 26, 0.26) 0%, rgba(107, 224, 26, 0) 68%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: repeating-linear-gradient(90deg, var(--about-line) 0 10px, transparent 10px 20px);
}

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

.page-about .breadcrumbs__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 0 clamp(20px, 4vw, 34px);
  padding: 0;
  list-style: none;
  font-family: var(--k-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--k-grey);
}

.page-about .breadcrumbs__item {
  display: flex;
  align-items: center;
  gap: 8px;
}

.page-about .breadcrumbs__item + .breadcrumbs__item::before {
  content: "/";
  color: rgba(18, 22, 28, 0.28);
}

.page-about .breadcrumbs__item a {
  color: var(--k-grey);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--k-ease), border-color 0.2s var(--k-ease);
}

.page-about .breadcrumbs__item a:hover {
  color: var(--k-green-deep);
  border-bottom-color: var(--k-green-deep);
}

.page-about .about-hero__kicker {
  margin: 0 0 14px;
  color: var(--k-green-deep);
}

.page-about .about-hero__title {
  margin: 0 0 clamp(16px, 3vw, 24px);
  max-width: 16ch;
  font-size: clamp(38px, 8.6vw, 84px);
  font-weight: 900;
  line-height: 0.96;
  letter-spacing: -0.02em;
  color: var(--k-night);
}

.page-about .about-hero__accent {
  position: relative;
  display: inline-block;
  z-index: 0;
  white-space: nowrap;
}

.page-about .about-hero__accent::after {
  content: "";
  position: absolute;
  left: -3px;
  right: -3px;
  bottom: 0.08em;
  height: 0.32em;
  background: var(--k-green);
  transform: skewX(-10deg);
  z-index: -1;
}

.page-about .about-hero__lead {
  margin: 0 0 clamp(26px, 5vw, 44px);
  max-width: 54ch;
  font-size: clamp(16px, 3.4vw, 18px);
  line-height: 1.85;
  color: var(--k-grey);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  max-width: 760px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
  border-radius: 2px 22px 2px 22px;
  overflow: hidden;
}

@media (min-width: 620px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-fact {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 20px;
  background: #ffffff;
}

.page-about .about-fact__num {
  font-family: var(--k-mono);
  font-size: clamp(26px, 5vw, 34px);
  font-weight: 700;
  line-height: 1;
  color: var(--k-orange);
}

.page-about .about-fact__label {
  font-size: 13px;
  line-height: 1.5;
  color: var(--k-grey);
}

.page-about .about-hero__index {
  position: relative;
  z-index: 1;
  margin-top: clamp(30px, 6vw, 54px);
  padding-bottom: clamp(24px, 4vw, 36px);
}

.page-about .about-toc {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-toc .doc-index__link {
  border-radius: 2px 14px 2px 14px;
  border: 1px solid var(--about-line);
  background: #ffffff;
  padding: 7px 12px;
  transition: border-color 0.2s var(--k-ease), background 0.2s var(--k-ease);
}

.page-about .about-toc .doc-index__link:hover,
.page-about .about-toc .doc-index__link[aria-current="true"] {
  border-color: var(--k-green-deep);
  background: var(--k-green-soft);
}

/* ---------- 通用章节 ---------- */
.page-about .about-section {
  padding: clamp(52px, 9vw, 100px) 0;
}

.page-about .about-section--timeline {
  background: linear-gradient(180deg, #ffffff 0%, var(--k-paper) 100%);
}

.page-about .about-section--sources {
  background: #ffffff;
}

.page-about .about-section--roadmap {
  background: linear-gradient(180deg, var(--k-paper) 0%, #eef6e6 100%);
}

.page-about .rail {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.page-about .rail__text {
  margin: 0 0 12px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--k-grey);
}

.page-about .rail__block--accent {
  background: var(--k-green-soft);
  border-color: rgba(30, 122, 46, 0.24);
}

.page-about .link-more {
  font-family: var(--k-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
}

/* ---------- 01 起点 ---------- */
.page-about .about-origin p {
  font-size: clamp(16px, 3.4vw, 17.5px);
}

.page-about .about-phase {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.page-about .about-phase__item {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding-left: 14px;
  border-left: 3px solid var(--k-green);
}

.page-about .about-phase__name {
  font-family: var(--k-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--k-night);
}

.page-about .about-phase__desc {
  font-size: 14px;
  line-height: 1.6;
  color: var(--k-grey);
}

/* ---------- 02 版本折线 ---------- */
.page-about .tl-chart {
  margin: 0 0 clamp(34px, 6vw, 60px);
  padding: clamp(16px, 3.4vw, 30px);
  background: var(--k-night);
  border-radius: 2px 26px 2px 26px;
  border-left: 5px solid var(--k-green);
}

.page-about .tl-chart svg {
  display: block;
  width: 100%;
  height: auto;
  overflow: visible;
}

.page-about .tl-chart__node {
  fill: var(--k-night);
  stroke: var(--k-green);
  stroke-width: 4;
}

.page-about .tl-chart__node--last {
  stroke: var(--k-orange);
}

.page-about .tl-chart__label {
  fill: #edf1f7;
  font-family: var(--k-mono);
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.page-about .tl-chart figcaption {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.7;
  color: rgba(237, 241, 247, 0.66);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  display: grid;
  gap: 0;
}

.page-about .tl-item {
  position: relative;
  display: grid;
  grid-template-columns: var(--about-axis) minmax(0, 1fr);
  gap: clamp(12px, 3vw, 26px);
  padding-bottom: clamp(28px, 5vw, 48px);
}

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

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: calc(var(--about-axis) / 2 - 1px);
  top: 38px;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--about-line), rgba(18, 22, 28, 0));
}

.page-about .tl-item:last-child::before {
  display: none;
}

.page-about .tl-axis {
  display: flex;
  justify-content: center;
}

.page-about .tl-ver {
  display: inline-block;
  padding: 6px 9px;
  font-family: var(--k-mono);
  font-size: clamp(12px, 2.8vw, 15px);
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--k-night);
  background: var(--k-green);
  border-radius: 2px 14px 2px 14px;
  white-space: nowrap;
}

.page-about .tl-body {
  padding: clamp(16px, 3vw, 26px);
  background: #ffffff;
  border: 1px solid var(--about-line);
  border-left: 4px solid var(--k-orange);
  border-radius: 2px 20px 2px 20px;
  transition: transform 0.3s var(--k-ease), box-shadow 0.3s var(--k-ease);
}

.page-about .tl-body:hover,
.page-about .tl-body:focus-within {
  transform: translateX(5px);
  box-shadow: 0 16px 34px rgba(11, 27, 58, 0.09);
}

.page-about .tl-item--current .tl-body {
  border-left-color: var(--k-green);
  background: linear-gradient(135deg, #ffffff 0%, #f2fce8 100%);
}

.page-about .tl-title {
  margin: 0 0 10px;
  font-size: clamp(19px, 3.6vw, 23px);
  font-weight: 800;
  line-height: 1.3;
  color: var(--k-night);
}

.page-about .tl-text {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--k-grey);
}

.page-about .tl-note {
  margin: 14px 0 0;
  padding-left: 12px;
  border-left: 2px solid var(--k-orange-soft);
  font-family: var(--k-mono);
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--k-grey);
}

/* ---------- 03 团队 ---------- */
.page-about .team-photo {
  margin: 0 0 clamp(28px, 5vw, 44px);
  border-radius: 2px 24px 2px 24px;
  overflow: hidden;
}

.page-about .team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin: 0 0 clamp(30px, 5vw, 48px);
  padding: 0;
  list-style: none;
}

@media (min-width: 720px) {
  .page-about .team-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .city-card {
  position: relative;
  padding: 22px 20px 24px;
  background: #ffffff;
  border: 1px solid var(--about-line);
  border-radius: var(--about-notch);
  transition: transform 0.28s var(--k-ease), border-color 0.28s var(--k-ease), box-shadow 0.28s var(--k-ease);
}

.page-about .city-card::after {
  content: "";
  position: absolute;
  left: 20px;
  right: 20px;
  bottom: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--k-green), var(--k-orange));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.32s var(--k-ease);
}

.page-about .city-card:hover,
.page-about .city-card:focus-within {
  transform: translateY(-4px);
  border-color: var(--k-green-deep);
  box-shadow: 0 18px 38px rgba(11, 27, 58, 0.09);
}

.page-about .city-card:hover::after,
.page-about .city-card:focus-within::after {
  transform: scaleX(1);
}

.page-about .city-card__num {
  display: inline-block;
  margin-bottom: 12px;
  font-family: var(--k-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--k-orange);
}

.page-about .city-card__name {
  margin: 0 0 6px;
  font-size: clamp(21px, 4vw, 26px);
  font-weight: 900;
  letter-spacing: 0.02em;
  color: var(--k-night);
}

.page-about .city-card__role {
  margin: 0 0 12px;
  font-family: var(--k-mono);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--k-green-deep);
}

.page-about .city-card__duty {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--k-grey);
}

.page-about .workflow {
  padding: clamp(20px, 4vw, 32px);
  background: var(--k-night);
  border-radius: 2px 26px 2px 26px;
  color: #edf1f7;
}

.page-about .workflow__title {
  margin: 0 0 20px;
  font-size: clamp(19px, 3.6vw, 24px);
  font-weight: 800;
  color: #edf1f7;
}

.page-about .workflow__steps {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: none;
}

@media (min-width: 780px) {
  .page-about .workflow__steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 24px;
  }
}

.page-about .workflow__step {
  padding-top: 16px;
  border-top: 2px solid rgba(107, 224, 26, 0.4);
}

.page-about .workflow__num {
  display: block;
  margin-bottom: 8px;
  font-family: var(--k-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--k-green);
}

.page-about .workflow__name {
  display: block;
  margin-bottom: 8px;
  font-size: 17px;
  font-weight: 700;
  color: #ffffff;
}

.page-about .workflow__step p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: rgba(237, 241, 247, 0.72);
}

/* ---------- 04 数据来源 ---------- */
.page-about .source-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .source-item {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 14px;
  padding: 18px 18px 18px 16px;
  background: var(--k-paper);
  border: 1px solid var(--about-line);
  border-radius: var(--about-notch);
}

.page-about .source-item__num {
  font-family: var(--k-mono);
  font-size: 15px;
  font-weight: 700;
  color: var(--k-orange);
  letter-spacing: 0.06em;
}

.page-about .source-item__name {
  margin: 0 0 6px;
  font-size: 18px;
  font-weight: 800;
  color: var(--k-night);
}

.page-about .source-item__desc {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--k-grey);
}

.page-about .about-fix {
  background: var(--k-orange-soft);
  border-color: rgba(255, 106, 19, 0.32);
}

.page-about .about-fix p {
  margin: 0 0 10px;
  font-size: 14.5px;
  line-height: 1.8;
  color: #7a3a06;
}

.page-about .about-fix__meta {
  margin: 0 !important;
  font-family: var(--k-mono);
  font-size: 12px !important;
  letter-spacing: 0.04em;
  color: rgba(122, 58, 6, 0.72) !important;
}

/* ---------- 05 重庆 ---------- */
.page-about .about-city {
  position: relative;
  padding: clamp(52px, 9vw, 100px) 0;
  background: var(--k-night);
  color: #edf1f7;
  overflow: hidden;
}

.page-about .about-city::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 180px;
  height: 100%;
  background: repeating-linear-gradient(115deg, rgba(107, 224, 26, 0.14) 0 3px, transparent 3px 20px);
  pointer-events: none;
}

.page-about .about-city__head {
  position: relative;
  z-index: 1;
  margin-bottom: clamp(26px, 5vw, 44px);
}

.page-about .about-city__kicker {
  margin: 0 0 12px;
  color: var(--k-green);
}

.page-about .about-city__title {
  margin: 0 0 16px;
  max-width: 18ch;
  font-size: clamp(28px, 6vw, 52px);
  font-weight: 900;
  line-height: 1.04;
  letter-spacing: -0.01em;
  color: #ffffff;
}

.page-about .about-city__lead {
  margin: 0;
  max-width: 58ch;
  font-size: clamp(15.5px, 3.4vw, 17.5px);
  line-height: 1.85;
  color: rgba(237, 241, 247, 0.76);
}

.page-about .about-city__figure {
  position: relative;
  z-index: 1;
  margin: 0 0 clamp(26px, 5vw, 40px);
  border-radius: 2px 26px 2px 26px;
  overflow: hidden;
  border: 1px solid var(--k-hair-dark);
}

.page-about .about-city__figure .media-frame__cap {
  color: rgba(237, 241, 247, 0.66);
}

.page-about .about-city__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

@media (min-width: 780px) {
  .page-about .about-city__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .city-panel {
  padding: 20px;
  background: rgba(27, 59, 122, 0.44);
  border: 1px solid var(--k-hair-dark);
  border-radius: var(--about-notch);
}

.page-about .city-panel__title {
  margin: 0 0 10px;
  font-size: 17px;
  font-weight: 800;
  color: var(--k-green);
}

.page-about .city-panel p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(237, 241, 247, 0.78);
}

.page-about .city-panel a {
  color: var(--k-green-soft);
  text-decoration: none;
  border-bottom: 1px solid rgba(200, 255, 107, 0.5);
}

.page-about .city-panel a:hover {
  border-bottom-color: var(--k-green-soft);
}

/* ---------- 06 合作 ---------- */
.page-about .partners {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 4vw, 40px);
  align-items: start;
}

@media (min-width: 860px) {
  .page-about .partners {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    gap: clamp(30px, 5vw, 64px);
  }
}

.page-about .partners__stat {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin: 0;
  padding: 22px 24px;
  background: var(--k-green-soft);
  border-radius: 2px 26px 2px 26px;
  border-left: 5px solid var(--k-green-deep);
}

.page-about .partners__num {
  font-family: var(--k-mono);
  font-size: clamp(48px, 12vw, 80px);
  font-weight: 700;
  line-height: 0.95;
  color: var(--k-night);
}

.page-about .partners__unit {
  font-size: 15px;
  line-height: 1.5;
  color: var(--k-green-deep);
}

.page-about .partners__body p {
  margin: 0 0 16px;
  font-size: clamp(15.5px, 3.4vw, 17px);
  line-height: 1.85;
  color: var(--k-grey);
}

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

.page-about .partners__body a {
  color: var(--k-green-deep);
  font-weight: 700;
  text-decoration: none;
  border-bottom: 2px solid var(--k-green);
}

.page-about .partners__body a:hover {
  color: var(--k-orange);
  border-bottom-color: var(--k-orange);
}

/* ---------- 07 路线图 ---------- */
.page-about .roadmap-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin: 0 0 clamp(34px, 6vw, 56px);
  padding: 0;
  list-style: none;
}

@media (min-width: 800px) {
  .page-about .roadmap-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .roadmap-item {
  padding: 22px;
  background: #ffffff;
  border: 1px solid var(--about-line);
  border-radius: var(--about-notch);
  transition: border-color 0.25s var(--k-ease), transform 0.25s var(--k-ease);
}

.page-about .roadmap-item:hover {
  border-color: var(--k-green-deep);
  transform: translateY(-3px);
}

.page-about .roadmap-item__tag {
  display: inline-block;
  margin-bottom: 12px;
  padding: 4px 10px;
  font-family: var(--k-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--k-night);
  background: var(--k-green);
  border-radius: 2px 12px 2px 12px;
}

.page-about .roadmap-item__title {
  margin: 0 0 10px;
  font-size: clamp(18px, 3.6vw, 21px);
  font-weight: 800;
  line-height: 1.35;
  color: var(--k-night);
}

.page-about .roadmap-item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--k-grey);
}

.page-about .roadmap-item p a {
  color: var(--k-green-deep);
  font-weight: 700;
  text-decoration: none;
  border-bottom: 2px solid var(--k-green);
}

.page-about .roadmap-item p a:hover {
  color: var(--k-orange);
  border-bottom-color: var(--k-orange);
}

/* ---------- 结尾 CTA ---------- */
.page-about .about-cta {
  padding: clamp(26px, 5vw, 44px);
  background: var(--k-night);
  border-radius: 2px 28px 2px 28px;
  border-right: 6px solid var(--k-green);
}

.page-about .about-cta__title {
  margin: 0 0 12px;
  max-width: 22ch;
  font-size: clamp(22px, 4.6vw, 34px);
  font-weight: 900;
  line-height: 1.2;
  color: #ffffff;
}

.page-about .about-cta__text {
  margin: 0 0 22px;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(237, 241, 247, 0.74);
}

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

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .tl-body,
  .page-about .city-card,
  .page-about .roadmap-item,
  .page-about .city-card::after {
    transition: none;
  }

  .page-about .tl-body:hover,
  .page-about .tl-body:focus-within,
  .page-about .city-card:hover,
  .page-about .city-card:focus-within,
  .page-about .roadmap-item:hover {
    transform: none;
  }
}