.page-about {
  background: var(--night);
  color: var(--label);
  overflow-x: hidden;
  padding-bottom: clamp(48px, 8vw, 96px);
}

.page-about h1,
.page-about h2,
.page-about h3 {
  letter-spacing: -0.02em;
  margin: 0;
}

.page-about p {
  margin: 0;
  line-height: 1.8;
  font-size: 16px;
  color: var(--muted);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding-top: clamp(20px, 4vw, 40px);
  padding-bottom: clamp(32px, 6vw, 72px);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -30%;
  right: -14%;
  width: 58%;
  height: 160%;
  background: linear-gradient(155deg, rgba(23, 162, 107, 0.22), rgba(53, 194, 214, 0.07) 52%, transparent 78%);
  transform: skewX(-6deg);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 48px);
  align-items: start;
}

.page-about .about-hero__main {
  min-width: 0;
}

.page-about .about-hero__title {
  margin-top: 18px;
  font-size: clamp(28px, 6vw, 48px);
  font-weight: 800;
  line-height: 1.2;
  color: var(--label);
}

.page-about .about-hero__lede {
  margin-top: 16px;
  max-width: 34em;
  font-size: clamp(15px, 2.2vw, 17px);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  min-width: 0;
}

.page-about .stat-tile {
  position: relative;
  padding: 16px 16px 18px;
  background: var(--stand);
  border: 1px solid var(--line);
  border-top: 2px solid var(--field);
  min-width: 0;
}

.page-about .stat-tile:nth-child(2) {
  border-top-color: var(--signal);
}

.page-about .stat-tile:nth-child(3) {
  border-top-color: var(--cyan);
}

.page-about .stat-tile:nth-child(4) {
  border-top-color: var(--turf);
}

.page-about .stat-tile__num {
  display: block;
  font-size: clamp(26px, 5vw, 38px);
  font-weight: 700;
  line-height: 1;
  color: var(--label);
}

.page-about .stat-tile__cap {
  display: block;
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--muted);
}

/* ---------- 章节骨架 ---------- */

.page-about .about-sec {
  padding-block: clamp(36px, 6vw, 76px);
  border-top: 1px solid var(--line);
}

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

.page-about .section-head__no {
  display: block;
  font-size: clamp(20px, 3.4vw, 28px);
  font-weight: 800;
  color: var(--field);
  line-height: 1;
  margin-bottom: 10px;
}

.page-about .section-head__title {
  font-size: clamp(21px, 3.6vw, 34px);
  font-weight: 800;
  line-height: 1.28;
  color: var(--label);
  max-width: 26em;
}

.page-about .section-head__note {
  margin-top: 12px;
  font-size: 14px;
  color: var(--muted);
}

.page-about .ab-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3.4vw, 38px);
  align-items: start;
}

.page-about .prose {
  max-width: 34em;
}

.page-about .prose + .prose {
  margin-top: 14px;
}

/* ---------- 01 赛场视野 ---------- */

.page-about .vision-copy {
  min-width: 0;
}

.page-about .vision-list {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .vision-list li {
  background: var(--stand);
  border-left: 3px solid var(--field);
  padding: 14px 16px;
  display: grid;
  gap: 4px;
}

.page-about .vision-list__k {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--turf);
}

.page-about .vision-list__v {
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--label);
}

.page-about .vision-media {
  min-width: 0;
}

/* ---------- 02 团队分工 ---------- */

.page-about .crew {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .crew-board {
  position: relative;
  display: flex;
  flex-direction: column;
  min-width: 0;
  padding: 20px 18px 20px 20px;
  background: var(--stand);
  border: 1px solid var(--line);
  transition: border-color var(--ease), transform var(--ease);
}

.page-about .crew-board::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  width: 3px;
  background: var(--field);
}

.page-about .crew-board--editor::before {
  background: var(--cyan);
}

.page-about .crew-board--product::before {
  background: var(--signal);
}

.page-about .crew-board--service::before {
  background: var(--turf);
}

.page-about .crew-board:hover,
.page-about .crew-board:focus-within {
  border-color: var(--turf);
  transform: translateY(-3px);
}

.page-about .crew-board__no {
  display: block;
  font-size: clamp(34px, 6vw, 50px);
  font-weight: 800;
  line-height: 1;
  color: var(--field);
}

.page-about .crew-board--editor .crew-board__no {
  color: var(--cyan);
}

.page-about .crew-board--product .crew-board__no {
  color: var(--signal);
}

.page-about .crew-board--service .crew-board__no {
  color: var(--turf);
}

.page-about .crew-board__title {
  margin-top: 12px;
  font-size: 17px;
  font-weight: 800;
  color: var(--label);
}

.page-about .crew-board__sub {
  margin-top: 6px;
  font-size: 13px;
  color: var(--muted);
}

.page-about .crew-board__duties {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: grid;
  gap: 9px;
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .crew-board__duties li {
  position: relative;
  padding-left: 15px;
}

.page-about .crew-board__duties li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.68em;
  width: 7px;
  height: 1px;
  background: var(--turf);
}

.page-about .crew-media {
  margin-top: clamp(20px, 3vw, 32px);
}

/* ---------- 03 发展历程 ---------- */

.page-about .journey-rail {
  overflow-x: auto;
  overflow-y: hidden;
  padding-bottom: 10px;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
}

.page-about .journey-track {
  position: relative;
  display: flex;
  gap: 16px;
  margin: 0;
  padding: 0 0 8px;
  list-style: none;
  width: max-content;
  min-width: 100%;
}

.page-about .journey-track::before {
  content: "";
  position: absolute;
  top: 46px;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--line);
}

.page-about .journey-node {
  flex: 0 0 min(272px, 74vw);
  scroll-snap-align: start;
  min-width: 0;
}

.page-about .journey-card {
  background: var(--stand);
  border: 1px solid var(--line);
  padding: 16px 18px 18px;
  transition: border-color var(--ease);
}

.page-about .journey-card:hover {
  border-color: var(--turf);
}

.page-about .journey-card[open] {
  border-color: var(--signal);
}

.page-about .journey-card summary {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  list-style: none;
}

.page-about .journey-card summary::-webkit-details-marker {
  display: none;
}

.page-about .journey-card__dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--field);
  box-shadow: 0 0 0 4px rgba(23, 162, 107, 0.16);
  flex: none;
}

.page-about .journey-card[open] .journey-card__dot {
  background: var(--signal);
  box-shadow: 0 0 0 4px rgba(255, 122, 41, 0.18);
}

.page-about .journey-card__yr {
  font-size: 15px;
  font-weight: 700;
  color: var(--turf);
}

.page-about .journey-card__name {
  flex: 1 0 100%;
  font-size: 16px;
  font-weight: 800;
  line-height: 1.4;
  color: var(--label);
}

.page-about .journey-card p {
  margin-top: 12px;
  font-size: 14px;
  line-height: 1.75;
}

/* ---------- 04 合作生态 ---------- */

.page-about .eco-copy {
  min-width: 0;
}

.page-about .eco-roles {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .eco-roles li {
  border-left: 2px solid var(--line);
  padding-left: 16px;
}

.page-about .eco-roles h3 {
  font-size: 15.5px;
  font-weight: 800;
  color: var(--label);
}

.page-about .eco-roles p {
  margin-top: 6px;
  font-size: 14px;
}

.page-about .eco-map {
  min-width: 0;
}

.page-about .eco-media {
  margin-bottom: 18px;
}

.page-about .city-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(84px, 1fr));
  gap: 8px;
}

.page-about .city-node {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 6px;
  padding: 10px 10px 9px;
  background: var(--stand);
  border: 1px solid var(--line);
  cursor: default;
  transition: border-color var(--ease), background var(--ease), transform var(--ease);
}

.page-about .city-node:hover,
.page-about .city-node:focus-visible {
  border-color: var(--turf);
  background: rgba(79, 209, 165, 0.1);
  transform: translateY(-2px);
  outline: none;
}

.page-about .city-node__name {
  font-size: 14px;
  color: var(--label);
}

.page-about .city-node__count {
  font-size: 13px;
  color: var(--turf);
}

.page-about .eco-legend {
  margin-top: 14px;
  color: var(--muted);
  border: 1px solid var(--line);
  padding: 5px 10px;
  display: inline-block;
}

/* ---------- 05 荣誉与记录 ---------- */

.page-about .rec-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .rec-item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 16px;
  padding: 18px;
  border: 1px dashed var(--line);
  background: rgba(18, 37, 61, 0.45);
  transition: border-color var(--ease), background var(--ease);
}

.page-about .rec-item:hover {
  border-color: var(--turf);
  background: rgba(18, 37, 61, 0.9);
}

.page-about .rec-item__k {
  font-size: 13px;
  font-weight: 700;
  color: var(--field);
  letter-spacing: 0.08em;
  padding-top: 3px;
}

.page-about .rec-item__body {
  min-width: 0;
}

.page-about .rec-item__body h3 {
  font-size: 16px;
  font-weight: 800;
  line-height: 1.45;
  color: var(--label);
}

.page-about .rec-item__body p {
  margin-top: 8px;
  font-size: 14px;
}

/* ---------- 06 服务覆盖与下一步 ---------- */

.page-about .coverage-copy {
  min-width: 0;
}

.page-about .scene-list {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .scene-list li {
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--label);
  background: var(--stand);
  border: 1px solid var(--line);
  padding: 7px 12px;
}

.page-about .next-links {
  display: grid;
  gap: 10px;
}

.page-about .next-links a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 16px 18px;
  background: var(--stand);
  border: 1px solid var(--line);
  color: var(--label);
  font-size: 15.5px;
  font-weight: 800;
  text-decoration: none;
  transition: border-color var(--ease), background var(--ease), transform var(--ease);
}

.page-about .next-links a:hover,
.page-about .next-links a:focus-visible {
  border-color: var(--turf);
  background: rgba(79, 209, 165, 0.1);
  transform: translateX(3px);
  outline: none;
}

.page-about .next-links a span[aria-hidden="true"] {
  font-family: var(--font-mono);
  color: var(--turf);
  font-weight: 700;
}

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

/* ---------- 响应式 ---------- */

@media (min-width: 620px) {
  .page-about .crew {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 8fr) minmax(0, 4fr);
    gap: clamp(28px, 4vw, 56px);
  }

  .page-about .about-stats {
    grid-template-columns: minmax(0, 1fr);
    gap: 12px;
  }

  .page-about .vision-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(26px, 3.6vw, 44px);
  }

  .page-about .crew {
    grid-template-columns: 4fr 3fr 3fr 2fr;
    gap: 14px;
  }

  .page-about .crew-board {
    min-height: 236px;
  }

  .page-about .eco-grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
    gap: clamp(26px, 3.6vw, 44px);
  }

  .page-about .coverage-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(26px, 3.6vw, 44px);
  }
}

@media (min-width: 1180px) {
  .page-about .rec-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .crew-board,
  .page-about .city-node,
  .page-about .next-links a,
  .page-about .journey-card {
    transition: none;
  }

  .page-about .crew-board:hover,
  .page-about .city-node:hover,
  .page-about .city-node:focus-visible,
  .page-about .next-links a:hover,
  .page-about .next-links a:focus-visible {
    transform: none;
  }
}