/* ===== 平台介绍页 / page-about ===== */

.page-about {
  background: var(--ivory);
  color: var(--graphite);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: 24px 0 48px;
  background: linear-gradient(168deg, var(--mist) 0%, var(--ivory) 64%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: -34%;
  right: -16%;
  width: 44%;
  height: 172%;
  background: var(--blue-deep);
  opacity: 0.055;
  transform: rotate(11deg);
  pointer-events: none;
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 28px;
}

.page-about .about-hero h1 {
  margin: 14px 0 16px;
  font-size: clamp(28px, 5.4vw, 46px);
  font-weight: 700;
  line-height: 1.14;
  letter-spacing: -0.02em;
  color: var(--blue-deep);
}

.page-about .about-hero__lede {
  max-width: 34em;
  margin: 0;
  font-size: 16px;
  line-height: 1.8;
  color: rgba(34, 38, 46, 0.82);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 24px 0 0;
}

.page-about .about-hero__panel {
  padding: 22px 20px;
  background: var(--blue-deep);
  border-left: 4px solid var(--amber);
}

.page-about .about-hero__panel-title {
  margin: 0 0 16px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: rgba(245, 241, 230, 0.62);
}

.page-about .about-stat-list {
  display: grid;
  gap: 14px;
  margin: 0;
}

.page-about .about-stat {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--rule-invert);
}

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

.page-about .about-stat dt {
  font-size: 13px;
  letter-spacing: 0.06em;
  color: rgba(245, 241, 230, 0.7);
}

.page-about .about-stat dd {
  margin: 0;
  font-size: 14px;
  color: var(--ivory);
}

.page-about .about-stat .num--lg {
  color: var(--amber);
  font-size: 26px;
  line-height: 1;
}

/* ---------- 通用章节骨架 ---------- */
.page-about .about-body {
  background: var(--ivory);
}

.page-about .about-section {
  padding: 56px 0;
}

.page-about .about-section + .about-section {
  border-top: 1px solid var(--rule);
}

.page-about .about-section__head {
  display: flex;
  gap: 14px;
  margin-bottom: 30px;
}

.page-about .about-section__num {
  flex: 0 0 auto;
  margin: 4px 0 0;
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--amber-ink);
}

.page-about .about-section__head h2 {
  margin: 0 0 10px;
  font-size: clamp(22px, 3.6vw, 32px);
  font-weight: 700;
  line-height: 1.18;
  letter-spacing: -0.02em;
  color: var(--blue-deep);
}

.page-about .about-section__note {
  max-width: 40em;
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(34, 38, 46, 0.72);
}

/* ---------- 01 使用场景 ---------- */
.page-about .about-scenes {
  border-top: 1px solid var(--rule);
}

.page-about .about-scene {
  display: grid;
  gap: 8px;
  padding: 22px 0;
  border-bottom: 1px solid var(--rule);
}

.page-about .about-scene__tag {
  justify-self: start;
  margin: 0;
}

.page-about .about-scene__title {
  margin: 0;
  font-size: 18px;
  font-weight: 700;
  line-height: 1.3;
  color: var(--blue-deep);
}

.page-about .about-scene__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(34, 38, 46, 0.78);
}

/* ---------- 02 版本演进 ---------- */
.page-about .about-timeline__layout {
  display: grid;
  gap: 22px;
}

.page-about .about-years {
  display: flex;
  gap: 4px;
  overflow-x: auto;
  border-bottom: 1px solid var(--rule);
  scrollbar-width: none;
}

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

.page-about .about-year-link {
  display: flex;
  align-items: center;
  min-height: 44px;
  padding: 8px 12px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 15px;
  letter-spacing: 0.08em;
  color: rgba(34, 38, 46, 0.6);
  text-decoration: none;
  white-space: nowrap;
  border-bottom: 2px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .about-year-link:hover,
.page-about .about-year-link:focus-visible {
  color: var(--amber-ink);
  border-bottom-color: var(--amber);
  background: rgba(217, 154, 34, 0.08);
}

.page-about .about-timeline__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-node {
  position: relative;
  padding: 0 0 30px 24px;
  border-left: 1px solid var(--rule-strong);
  scroll-margin-top: 96px;
}

.page-about .about-node:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}

.page-about .about-node::before {
  content: "";
  position: absolute;
  top: 8px;
  left: -5px;
  width: 9px;
  height: 9px;
  background: var(--ivory);
  border: 2px solid var(--jade);
  transform: rotate(45deg);
  transition: background-color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-node:target::before {
  background: var(--amber);
  border-color: var(--amber);
}

.page-about .about-node__year {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--blue-deep);
}

.page-about .about-node:target .about-node__year {
  color: var(--coral-ink);
}

.page-about .about-node h3 {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.35;
  color: var(--blue-deep);
}

.page-about .about-node p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(34, 38, 46, 0.78);
}

.page-about .about-timeline__figure {
  margin: 26px 0 0;
}

.page-about .about-timeline__figure .media {
  aspect-ratio: 5 / 3;
}

/* ---------- 图片容器统一处理 ---------- */
.page-about .figure {
  margin: 0;
}

.page-about .figure .media {
  overflow: hidden;
  background: var(--mist);
}

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

.page-about .figure__caption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.7;
  color: rgba(34, 38, 46, 0.62);
}

/* ---------- 03 团队 ---------- */
.page-about .about-team__figure {
  margin-bottom: 32px;
}

.page-about .about-team__figure .media {
  aspect-ratio: 3 / 2;
}

.page-about .about-team__grid {
  display: grid;
  gap: 22px;
}

.page-about .about-team__item {
  padding-top: 16px;
  border-top: 2px solid var(--jade);
}

.page-about .about-team__count {
  margin: 0 0 8px;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: rgba(34, 38, 46, 0.6);
}

.page-about .about-team__count .num--lg {
  margin-right: 4px;
  font-size: 30px;
  line-height: 1;
  color: var(--jade);
}

.page-about .about-team__item h3 {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  color: var(--blue-deep);
}

.page-about .about-team__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(34, 38, 46, 0.78);
}

.page-about .about-chain {
  margin-top: 34px;
  padding: 22px 20px;
  background: var(--jade-light);
  border-left: 4px solid var(--jade);
}

.page-about .about-chain__title {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--jade-deep);
}

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

.page-about .about-chain__list li {
  font-size: 15px;
  line-height: 1.75;
  color: var(--graphite);
}

.page-about .about-chain__step {
  display: inline-block;
  margin-right: 10px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--jade-deep);
}

/* ---------- 04 内容规模 ---------- */
.page-about .about-section--scale .table-scroll {
  border-top: 2px solid var(--blue-mid);
}

.page-about .about-scale__figure {
  margin: 30px 0 26px;
}

.page-about .about-scale__figure .media {
  aspect-ratio: 3 / 2;
}

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

.page-about .about-tagwall li {
  padding: 7px 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--blue-deep);
  background: var(--paper);
  border: 1px solid var(--rule-strong);
  border-radius: var(--radius);
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .about-tagwall li:hover {
  border-color: var(--amber);
  color: var(--amber-ink);
}

/* ---------- 05 服务覆盖 ---------- */
.page-about .about-coverage {
  gap: 28px;
}

.page-about .about-coverage__text p {
  margin: 0 0 18px;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(34, 38, 46, 0.8);
}

.page-about .about-coverage__text a {
  color: var(--jade-deep);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color var(--dur) var(--ease);
}

.page-about .about-coverage__text a:hover,
.page-about .about-coverage__text a:focus-visible {
  color: var(--coral-ink);
}

.page-about .about-support-list {
  list-style: none;
  margin: 0 0 18px;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .about-support-list li {
  display: grid;
  gap: 4px;
  padding: 14px 0;
  border-top: 1px solid var(--rule);
}

.page-about .about-support-list li:last-child {
  border-bottom: 1px solid var(--rule);
}

.page-about .about-support-list__key {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--jade-deep);
}

.page-about .about-support-list__val {
  font-size: 15px;
  line-height: 1.75;
  color: var(--graphite);
  word-break: break-word;
}

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

.page-about .about-dotmap {
  padding: 20px;
  background: var(--paper);
  border: 1px solid var(--rule-strong);
}

.page-about .about-dotmap__label {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--blue-deep);
}

.page-about .about-dotmap__grid {
  height: 190px;
  background-color: var(--mist);
  background-image:
    radial-gradient(circle, var(--amber) 2.2px, transparent 2.4px),
    radial-gradient(circle, rgba(14, 35, 80, 0.32) 1.5px, transparent 1.7px);
  background-size: 66px 66px, 22px 22px;
  background-position: 8px 12px, 0 0;
  border: 1px solid var(--rule);
}

.page-about .about-dotmap__note {
  margin: 12px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: rgba(34, 38, 46, 0.64);
}

/* ---------- 06 合作生态 ---------- */
.page-about .about-partners {
  gap: 28px;
}

.page-about .about-partners__text p {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(34, 38, 46, 0.8);
}

.page-about .about-partners__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

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

.page-about .about-partner-tags li {
  padding: 10px 14px;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--graphite);
  background: var(--paper);
  border: 1px solid var(--rule-strong);
  border-radius: var(--radius);
  transition: background-color var(--dur) var(--ease), border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .about-partner-tags li:hover {
  background: var(--indigo);
  border-color: var(--indigo);
  color: var(--ivory);
}

/* ---------- 收束行动带 ---------- */
.page-about .about-cta {
  padding: 40px 0;
  background: linear-gradient(120deg, var(--indigo) 0%, var(--blue-deep) 100%);
}

.page-about .about-cta__inner {
  display: grid;
  gap: 20px;
}

.page-about .about-cta h2 {
  margin: 0 0 8px;
  font-size: clamp(20px, 3.2vw, 28px);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--ivory);
}

.page-about .about-cta p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(245, 241, 230, 0.78);
}

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

/* ---------- 平板及以上 ---------- */
@media (min-width: 901px) {
  .page-about .about-hero {
    padding: 32px 0 72px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    column-gap: 56px;
    align-items: start;
  }

  .page-about .about-hero__panel {
    padding: 26px 24px;
  }

  .page-about .about-section {
    padding: 84px 0;
  }

  .page-about .about-section__head {
    gap: 28px;
    margin-bottom: 40px;
  }

  .page-about .about-section__num {
    min-width: 40px;
    margin-top: 8px;
  }

  .page-about .about-scene {
    grid-template-columns: 128px minmax(0, 5fr) minmax(0, 7fr);
    column-gap: 30px;
    align-items: start;
    padding: 26px 0;
  }

  .page-about .about-scene__tag {
    margin-top: 3px;
  }

  .page-about .about-timeline__layout {
    grid-template-columns: 132px minmax(0, 1fr);
    column-gap: 48px;
    align-items: start;
  }

  .page-about .about-years {
    position: sticky;
    top: 24px;
    align-self: start;
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    border-bottom: 0;
  }

  .page-about .about-year-link {
    border-bottom: 0;
    border-left: 2px solid var(--rule);
    padding: 9px 10px 9px 16px;
    white-space: normal;
  }

  .page-about .about-year-link:hover,
  .page-about .about-year-link:focus-visible {
    border-left-color: var(--amber);
    border-bottom-color: transparent;
  }

  .page-about .about-team__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 32px;
  }

  .page-about .about-chain {
    padding: 28px 32px;
  }

  .page-about .about-chain__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px 40px;
  }

  .page-about .about-scale__figure {
    margin: 40px 0 30px;
  }

  .page-about .about-dotmap__grid {
    height: 240px;
  }

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    column-gap: 40px;
  }
}