/* ===== 平台介绍页 / page-about ===== */

.page-about {
  --about-radius: 18px 6px 18px 6px;
  --about-radius-alt: 6px 18px 6px 18px;
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding: 36px 0 0;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 560px;
  pointer-events: none;
  background:
    radial-gradient(760px 380px at 84% 4%, rgba(255, 122, 47, 0.20), transparent 64%),
    radial-gradient(680px 420px at 8% 0%, rgba(59, 227, 198, 0.16), transparent 62%);
}

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

.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 26px;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--slate);
}

.page-about .breadcrumb a {
  color: var(--slate);
  text-decoration: none;
  transition: color 180ms var(--ease);
}

.page-about .breadcrumb a:hover {
  color: var(--teal);
}

.page-about .breadcrumb__sep {
  color: var(--orbit);
}

.page-about .about-hero__title {
  max-width: 14em;
  margin: 14px 0 0;
  color: var(--mist);
  letter-spacing: -0.01em;
}

.page-about .about-hero__lede {
  max-width: 40em;
  margin-top: 20px;
  color: rgba(247, 250, 255, 0.82);
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 34px 0 0;
  padding: 1px;
  background: var(--orbit);
  border-radius: var(--about-radius);
  overflow: hidden;
}

.page-about .about-stat {
  padding: 16px 16px 18px;
  background: var(--space-blue);
}

.page-about .about-stat dt {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--slate);
}

.page-about .about-stat dd {
  margin: 8px 0 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(22px, 5.5vw, 34px);
  font-weight: 700;
  line-height: 1;
  color: var(--lime);
  white-space: nowrap;
}

.page-about .about-hero__figure {
  position: relative;
  z-index: 1;
  margin: 34px 0 0;
  padding: 0 24px;
}

.page-about .about-hero__figure .media {
  border-radius: var(--about-radius);
  overflow: hidden;
  border: 1px solid var(--orbit);
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 5 / 3;
  object-fit: cover;
}

/* ---------- 通用区块 ---------- */

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

.page-about .about-block .eyebrow {
  color: var(--teal);
}

.page-about .about-block .t-h2 {
  margin: 12px 0 0;
  color: var(--mist);
}

/* ---------- 起点 + 时间轴 ---------- */

.page-about .about-origin__lead {
  max-width: 44em;
  margin-top: 18px;
  font-size: 16px;
  line-height: 1.8;
  color: rgba(247, 250, 255, 0.8);
}

.page-about .about-timeline {
  position: relative;
  margin: 36px 0 0;
  padding: 4px 0 4px 34px;
  list-style: none;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 16px;
  background: linear-gradient(180deg, var(--teal) 0%, var(--teal) 34%, var(--orange) 100%);
  clip-path: polygon(0 0, 22% 0, 100% 100%, 0 100%);
  opacity: 0.9;
}

.page-about .about-node {
  position: relative;
  padding-bottom: 30px;
}

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

.page-about .about-node::before {
  content: "";
  position: absolute;
  left: -32px;
  top: 6px;
  width: 11px;
  height: 11px;
  background: var(--slate);
  transform: rotate(45deg);
  transition: background-color 180ms var(--ease), transform 180ms var(--ease);
}

.page-about .about-node:hover::before,
.page-about .about-node:focus-within::before {
  background: var(--lime);
  transform: rotate(45deg) scale(1.3);
}

.page-about .about-node__year {
  margin: 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--teal);
}

.page-about .about-node__title {
  margin: 6px 0 0;
  font-size: 19px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--mist);
}

.page-about .about-node__text {
  max-width: 40em;
  margin: 8px 0 0;
  font-size: 15.5px;
  line-height: 1.75;
  color: rgba(247, 250, 255, 0.76);
}

/* ---------- 覆盖范围 ---------- */

.page-about .about-cover__panel {
  padding: 28px 22px 32px;
  background: var(--cream);
  color: var(--ink);
  border: 1px solid var(--cream-line);
  border-radius: var(--about-radius);
}

.page-about .about-cover__eyebrow {
  color: var(--brick);
}

.page-about .about-cover__title {
  margin: 12px 0 0;
  color: var(--ink);
}

.page-about .about-cover__lead {
  max-width: 42em;
  margin-top: 16px;
  font-size: 15.5px;
  line-height: 1.8;
  color: rgba(35, 24, 15, 0.8);
}

.page-about .about-levels {
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--cream-line);
}

.page-about .about-level {
  display: grid;
  gap: 6px;
  padding: 15px 0;
  border-bottom: 1px solid var(--cream-line);
  transition: background-color 180ms var(--ease);
}

.page-about .about-level:hover {
  background: rgba(196, 71, 46, 0.05);
}

.page-about .about-level__name {
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--ink);
}

.page-about .about-level__desc {
  font-size: 15px;
  line-height: 1.7;
  color: rgba(35, 24, 15, 0.76);
}

.page-about .about-level__read {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.02em;
  color: var(--brick);
}

.page-about .about-region {
  margin-top: 40px;
}

.page-about .about-region__title {
  margin: 0;
  color: var(--mist);
}

.page-about .about-region__lead {
  max-width: 36em;
  margin-top: 12px;
  font-size: 15.5px;
  line-height: 1.75;
  color: rgba(247, 250, 255, 0.76);
}

.page-about .about-matrix {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(16px, 1fr));
  gap: 6px;
  margin-top: 22px;
  max-width: 480px;
}

.page-about .about-matrix__cell {
  aspect-ratio: 1 / 1;
  border-radius: 3px;
  background: var(--night-blue);
  border: 1px solid rgba(124, 137, 173, 0.32);
}

.page-about .about-matrix__cell--in {
  background: var(--teal);
  border-color: var(--teal);
  opacity: 0.88;
}

.page-about .about-matrix__legend {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 16px;
  margin: 18px 0 0;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--slate);
}

.page-about .about-legend__dot {
  display: inline-block;
  width: 10px;
  height: 10px;
  margin-right: 6px;
  border-radius: 2px;
  background: var(--night-blue);
  border: 1px solid rgba(124, 137, 173, 0.5);
  vertical-align: middle;
}

.page-about .about-legend__dot--in {
  background: var(--teal);
  border-color: var(--teal);
}

.page-about .about-region__note {
  max-width: 34em;
  margin: 18px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(247, 250, 255, 0.78);
}

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

.page-about .about-region__figure .media {
  border-radius: var(--about-radius-alt);
  overflow: hidden;
  border: 1px solid var(--orbit);
}

.page-about .about-region__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

/* ---------- 团队 ---------- */

.page-about .about-team__grid {
  display: grid;
  gap: 30px;
}

.page-about .about-team__text p {
  max-width: 42em;
  margin-top: 16px;
  font-size: 16px;
  line-height: 1.8;
  color: rgba(247, 250, 255, 0.82);
}

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

.page-about .about-team__figure .media {
  border-radius: var(--about-radius);
  overflow: hidden;
  border: 1px solid var(--orbit);
}

.page-about .about-team__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.page-about .about-flow {
  position: relative;
  margin: 40px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0;
}

.page-about .about-flow__node {
  position: relative;
  padding: 0 0 28px 34px;
}

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

.page-about .about-flow__node::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 10px;
  bottom: -6px;
  width: 2px;
  background: var(--orbit);
}

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

.page-about .about-flow__node::after {
  content: "";
  position: absolute;
  left: 0;
  top: 5px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--space-blue);
  border: 2px solid var(--teal);
  transition: background-color 180ms var(--ease), border-color 180ms var(--ease);
}

.page-about .about-flow__node:hover::after {
  background: var(--lime);
  border-color: var(--lime);
}

.page-about .about-flow__step {
  margin: 0;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--slate);
}

.page-about .about-flow__title {
  margin: 6px 0 0;
  font-size: 18px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--mist);
}

.page-about .about-flow__text {
  max-width: 40em;
  margin: 8px 0 0;
  font-size: 15.5px;
  line-height: 1.75;
  color: rgba(247, 250, 255, 0.76);
}

/* ---------- 赛季内容 ---------- */

.page-about .about-season__lead {
  max-width: 44em;
  margin-top: 18px;
  font-size: 16px;
  line-height: 1.8;
  color: rgba(247, 250, 255, 0.8);
}

.page-about .about-series {
  margin: 34px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 14px;
}

.page-about .about-series__item {
  position: relative;
  padding: 20px 20px 22px 22px;
  border-left: 3px solid var(--teal);
  border-radius: 0 var(--about-radius) var(--about-radius) 0;
  background: linear-gradient(90deg, rgba(30, 47, 99, 0.62), rgba(10, 20, 48, 0));
  transition: border-color 180ms var(--ease), background 180ms var(--ease);
}

.page-about .about-series__item:hover {
  border-left-color: var(--lime);
}

.page-about .about-series__item:nth-child(2) {
  border-left-color: var(--orange);
}

.page-about .about-series__item:nth-child(3) {
  border-left-color: var(--lime);
}

.page-about .about-series__item:nth-child(4) {
  border-left-color: var(--brick);
}

.page-about .about-series__item:nth-child(5) {
  border-left-color: var(--slate);
}

.page-about .about-series__item:nth-child(2):hover,
.page-about .about-series__item:nth-child(3):hover,
.page-about .about-series__item:nth-child(4):hover,
.page-about .about-series__item:nth-child(5):hover {
  border-left-color: var(--teal);
}

.page-about .about-series__no {
  margin: 0;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--teal);
}

.page-about .about-series__name {
  margin: 8px 0 0;
  font-size: 19px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--mist);
}

.page-about .about-series__text {
  max-width: 44em;
  margin: 8px 0 0;
  font-size: 15.5px;
  line-height: 1.75;
  color: rgba(247, 250, 255, 0.76);
}

/* ---------- 合作 ---------- */

.page-about .about-partners__lead {
  max-width: 42em;
  margin-top: 18px;
  font-size: 16px;
  line-height: 1.8;
  color: rgba(247, 250, 255, 0.8);
}

.page-about .about-partners__grid {
  display: grid;
  gap: 16px;
  margin-top: 30px;
}

.page-about .about-partner {
  padding: 24px 20px 26px;
  background: var(--night-blue);
  border: 1px solid var(--orbit);
  border-radius: var(--about-radius);
  transition: transform 180ms var(--ease), border-color 180ms var(--ease);
}

.page-about .about-partner:hover {
  transform: translateY(-3px);
  border-color: var(--teal);
}

.page-about .about-partner__name {
  margin: 0;
  font-size: 19px;
  font-weight: 700;
  color: var(--lime);
}

.page-about .about-partner__text {
  margin: 12px 0 0;
  font-size: 15.5px;
  line-height: 1.75;
  color: rgba(247, 250, 255, 0.78);
}

.page-about .about-partners__cta {
  margin: 26px 0 0;
  font-size: 15.5px;
  line-height: 1.75;
  color: rgba(247, 250, 255, 0.82);
}

/* ---------- 长期做法 ---------- */

.page-about .about-commit__inner {
  padding: 30px 22px 32px;
  background: linear-gradient(150deg, rgba(30, 47, 99, 0.85), rgba(10, 20, 48, 0.4));
  border: 1px solid var(--orbit);
  border-radius: var(--about-radius-alt);
}

.page-about .about-commit__list {
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 14px;
}

.page-about .about-commit__item {
  position: relative;
  padding-left: 28px;
  font-size: 15.5px;
  line-height: 1.75;
  color: rgba(247, 250, 255, 0.84);
}

.page-about .about-commit__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 14px;
  height: 2px;
  background: var(--lime);
}

.page-about .about-commit__note {
  margin: 24px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(247, 250, 255, 0.72);
}

/* ---------- 结尾入口 ---------- */

.page-about .about-next {
  padding-bottom: 72px;
}

.page-about .about-next__inner {
  display: grid;
  gap: 22px;
  padding-top: 32px;
  border-top: 1px solid var(--orbit);
}

.page-about .about-next__text .t-h3 {
  margin: 0;
  color: var(--mist);
}

.page-about .about-next__text p {
  max-width: 34em;
  margin: 10px 0 0;
  font-size: 15.5px;
  line-height: 1.75;
  color: rgba(247, 250, 255, 0.78);
}

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

/* ---------- 响应式 ---------- */

@media (min-width: 700px) {
  .page-about .about-hero {
    padding-top: 56px;
  }

  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-hero__figure {
    padding: 0 32px;
  }

  .page-about .about-block {
    padding: 72px 0;
  }

  .page-about .about-timeline {
    padding-left: 44px;
  }

  .page-about .about-node::before {
    left: -42px;
  }

  .page-about .about-cover__panel {
    padding: 36px 34px 40px;
  }

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

  .page-about .about-commit__inner {
    padding: 40px 38px 42px;
  }

  .page-about .about-next__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 32px;
  }
}

@media (min-width: 1000px) {
  .page-about .about-region {
    display: grid;
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 40px;
    align-items: start;
    margin-top: 52px;
  }

  .page-about .about-region__figure {
    margin-top: 0;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 44px;
    align-items: start;
  }

  .page-about .about-flow {
    margin-top: 48px;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 24px;
  }

  .page-about .about-flow__node {
    padding: 26px 8px 0 0;
  }

  .page-about .about-flow__node::before {
    left: 0;
    top: 8px;
    bottom: auto;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, var(--teal), var(--orbit));
  }

  .page-about .about-flow__node::after {
    left: 0;
    top: 1px;
  }

  .page-about .about-flow__node:last-child::before {
    display: block;
    background: linear-gradient(90deg, var(--teal), transparent);
  }

  .page-about .about-series {
    grid-template-columns: repeat(6, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .about-series__item:nth-child(1) {
    grid-column: span 3;
  }

  .page-about .about-series__item:nth-child(2) {
    grid-column: span 3;
  }

  .page-about .about-series__item:nth-child(3) {
    grid-column: span 2;
  }

  .page-about .about-series__item:nth-child(4) {
    grid-column: span 2;
  }

  .page-about .about-series__item:nth-child(5) {
    grid-column: span 2;
  }

  .page-about .about-origin__lead {
    max-width: 38em;
  }
}

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