.page-about {
  --about-cut: 22px;
  --about-ink: rgba(242, 237, 228, 0.82);
  display: block;
  background-color: var(--abyss);
  color: var(--bone);
  font-family: var(--font-body);
  overflow-x: hidden;
}

.page-about .about-topline {
  padding-top: clamp(18px, 3vw, 30px);
}

/* ---------- 封面 ---------- */
.page-about .about-cover {
  position: relative;
  overflow: hidden;
  padding: clamp(26px, 4vw, 48px) 0 clamp(36px, 6vw, 76px);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-cover::before {
  content: "";
  position: absolute;
  right: -140px;
  bottom: -180px;
  width: min(560px, 78vw);
  height: min(560px, 78vw);
  background: radial-gradient(circle at 34% 34%, rgba(178, 58, 46, 0.62), rgba(178, 58, 46, 0) 68%);
  border-radius: 46% 54% 60% 40% / 50% 42% 58% 50%;
  pointer-events: none;
  z-index: 0;
}

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

.page-about .about-cover__title {
  margin: 16px 0 0;
  max-width: min(100%, 17em);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(30px, 6vw, 54px);
  line-height: 1.2;
  letter-spacing: 0.01em;
  color: var(--bone);
}

.page-about .about-cover__lead {
  margin: clamp(18px, 3vw, 26px) 0 0;
  max-width: 62ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.9;
  color: var(--bone-soft);
}

.page-about .about-cover__meta {
  list-style: none;
  margin: clamp(28px, 4vw, 46px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 18px;
}

.page-about .about-cover__meta li {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding-top: 14px;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-cover__meta .data-num {
  font-family: var(--font-data);
  font-size: clamp(21px, 3.2vw, 30px);
  line-height: 1.1;
  color: var(--lime);
}

.page-about .about-cover__meta .data-num + span {
  font-family: var(--font-heading);
  font-size: 13px;
  letter-spacing: 0.05em;
  color: var(--slate);
}

/* ---------- 通用区块 ---------- */
.page-about .about-section {
  position: relative;
  padding: clamp(44px, 7vw, 88px) 0;
}

.page-about h2 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(24px, 4.2vw, 36px);
  line-height: 1.26;
  letter-spacing: 0.01em;
  color: var(--bone);
}

.page-about .section-head__title {
  font-family: var(--font-display);
}

.page-about .section-head__note {
  font-family: var(--font-heading);
  letter-spacing: 0.03em;
  color: var(--slate);
}

/* ---------- 赛区版图 ---------- */
.page-about .about-map__grid {
  display: grid;
  gap: clamp(22px, 4vw, 40px);
  margin-top: clamp(24px, 4vw, 44px);
}

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

.page-about .about-map__body p {
  margin: 0 0 16px;
  font-size: clamp(15px, 1.5vw, 16px);
  line-height: 1.92;
  color: var(--bone-soft);
}

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

.page-about .about-map__body a {
  color: var(--lime);
  text-decoration: none;
  border-bottom: 1px solid rgba(183, 243, 76, 0.4);
  padding-bottom: 1px;
}

.page-about .about-map__body a:hover {
  border-bottom-color: var(--lime);
}

.page-about .region-files {
  margin-top: clamp(28px, 4vw, 48px);
}

.page-about .region-file {
  border-top: 1px solid var(--line-soft);
  background: linear-gradient(180deg, rgba(14, 22, 38, 0.92), rgba(7, 12, 22, 0.5));
}

.page-about .region-file:last-child {
  border-bottom: 1px solid var(--line-soft);
}

.page-about .region-file > summary {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 16px;
  padding: 17px clamp(14px, 2.4vw, 26px);
  cursor: pointer;
  list-style: none;
}

.page-about .region-file > summary::-webkit-details-marker {
  display: none;
}

.page-about .region-file__idx {
  flex: 0 0 auto;
  width: 26px;
  height: 26px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-data);
  font-size: 12px;
  color: var(--abyss);
  background: var(--sand);
  clip-path: polygon(0 0, 100% 0, 100% 70%, 70% 100%, 0 100%);
}

.page-about .region-file__name {
  flex: 1 1 auto;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 16px;
  letter-spacing: 0.03em;
  color: var(--bone);
}

.page-about .region-file__num {
  flex: 0 0 auto;
  font-family: var(--font-data);
  font-size: 13px;
  color: var(--slate);
  letter-spacing: 0.04em;
}

.page-about .region-file__mark {
  position: relative;
  flex: 0 0 auto;
  width: 16px;
  height: 16px;
}

.page-about .region-file__mark::before,
.page-about .region-file__mark::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  background: var(--sand);
  transform: translate(-50%, -50%);
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.page-about .region-file__mark::before {
  width: 14px;
  height: 1.5px;
}

.page-about .region-file__mark::after {
  width: 1.5px;
  height: 14px;
}

.page-about .region-file[open] .region-file__mark::after {
  opacity: 0;
  transform: translate(-50%, -50%) scaleY(0);
}

.page-about .region-file[open] > summary .region-file__name {
  color: var(--lime);
}

.page-about .region-file__body {
  padding: 2px clamp(14px, 2.4vw, 26px) 22px;
}

.page-about .region-file__body p {
  margin: 0;
  max-width: 68ch;
  font-size: 15px;
  line-height: 1.9;
  color: var(--bone-dim);
}

/* ---------- 数据服务团队 ---------- */
.page-about .about-team {
  background: linear-gradient(150deg, rgba(14, 22, 38, 0.9), rgba(7, 12, 22, 0.25) 62%);
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-team__grid {
  display: grid;
  gap: clamp(26px, 4vw, 46px);
}

.page-about .about-team__lead {
  margin: 18px 0 0;
  max-width: 58ch;
  font-size: clamp(15px, 1.5vw, 16px);
  line-height: 1.92;
  color: var(--bone-soft);
}

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

.page-about .duty-list {
  list-style: none;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
}

.page-about .duty-list li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  padding: 14px 0;
  border-top: 1px solid var(--line-soft);
  font-size: 15px;
  line-height: 1.7;
  color: var(--bone-soft);
}

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

.page-about .duty-list__num {
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--lime);
  padding-top: 4px;
}

/* ---------- 近 3 个赛季 ---------- */
.page-about .about-window__lead {
  margin: clamp(20px, 3vw, 30px) 0 0;
  max-width: 70ch;
  font-size: clamp(15px, 1.5vw, 16px);
  line-height: 1.95;
  color: var(--bone-soft);
}

.page-about .window-strip {
  margin-top: clamp(26px, 4vw, 42px);
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .window-strip__item {
  display: flex;
  flex-direction: column;
  gap: 7px;
  padding: 20px 18px 22px;
  background: var(--abyss);
}

.page-about .window-strip__num {
  font-family: var(--font-data);
  font-size: clamp(20px, 2.8vw, 27px);
  line-height: 1.15;
  color: var(--lime);
}

.page-about .window-strip__label {
  font-family: var(--font-heading);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--sand);
}

.page-about .window-strip__desc {
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--bone-dim);
}

/* ---------- 版本演进 ---------- */
.page-about .about-version__grid {
  display: grid;
  gap: clamp(26px, 4vw, 46px);
  margin-top: clamp(24px, 4vw, 44px);
}

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

.page-about .version-track {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .version-track::before {
  content: "";
  position: absolute;
  left: 15px;
  top: 14px;
  bottom: 18px;
  width: 1px;
  background: linear-gradient(180deg, var(--ochre) 0%, var(--sand) 48%, rgba(217, 164, 65, 0) 100%);
}

.page-about .version-node {
  position: relative;
  padding-left: 46px;
}

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

.page-about .version-node::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 21px;
  width: 13px;
  height: 13px;
  border: 1px solid var(--sand);
  background: var(--abyss);
  transform: rotate(45deg);
}

.page-about .version-node[data-state="current"]::before {
  background: var(--lime);
  border-color: var(--lime);
  box-shadow: 0 0 0 4px rgba(183, 243, 76, 0.14);
}

.page-about .version-node summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 14px;
  padding: 15px 18px;
  cursor: pointer;
  list-style: none;
  border: 1px solid var(--line-soft);
  background: linear-gradient(100deg, rgba(14, 22, 38, 0.92), rgba(7, 12, 22, 0.45));
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-cut)), calc(100% - var(--about-cut)) 100%, 0 100%);
  transition: border-color 0.2s ease, background 0.2s ease;
}

.page-about .version-node summary::-webkit-details-marker {
  display: none;
}

.page-about .version-node summary:hover {
  border-color: rgba(217, 164, 65, 0.55);
}

.page-about .version-node details[open] summary {
  border-color: rgba(183, 243, 76, 0.45);
  background: linear-gradient(100deg, rgba(20, 32, 54, 0.95), rgba(7, 12, 22, 0.5));
}

.page-about .version-node__idx {
  flex: 0 0 auto;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--sand);
}

.page-about .version-node__name {
  flex: 1 1 auto;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 15px;
  letter-spacing: 0.03em;
  color: var(--bone);
}

.page-about .version-node details[open] .version-node__name {
  color: var(--lime);
}

.page-about .version-node__meta {
  flex: 0 0 auto;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--slate);
}

.page-about .version-node__body {
  padding: 14px 18px 4px;
}

.page-about .version-node__body p {
  margin: 0 0 12px;
  max-width: 64ch;
  font-size: 14.5px;
  line-height: 1.88;
  color: var(--bone-dim);
}

/* ---------- 内容合作 ---------- */
.page-about .about-partners {
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-partners__grid {
  display: grid;
  gap: clamp(22px, 3.4vw, 36px);
  margin-top: clamp(20px, 3vw, 32px);
}

.page-about .about-partners__text {
  margin: 0;
  max-width: 62ch;
  font-size: clamp(15px, 1.5vw, 16px);
  line-height: 1.92;
  color: var(--bone-soft);
}

.page-about .partner-tags {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-content: flex-start;
}

/* ---------- 服务准则 ---------- */
.page-about .standard-list {
  list-style: none;
  margin: clamp(24px, 4vw, 40px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .standard-list__item {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 22px 20px 24px;
  background: var(--abyss);
  position: relative;
}

.page-about .standard-list__num {
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--ochre);
}

.page-about .standard-list__item h3 {
  margin: 0;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 16px;
  letter-spacing: 0.03em;
  color: var(--bone);
}

.page-about .standard-list__item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--bone-dim);
}

.page-about .standard-list__item a {
  color: var(--lime);
  text-decoration: none;
  border-bottom: 1px solid rgba(183, 243, 76, 0.4);
}

.page-about .standard-list__item a:hover {
  border-bottom-color: var(--lime);
}

/* ---------- 收尾 ---------- */
.page-about .about-close {
  position: relative;
  padding: clamp(46px, 7vw, 88px) 0 clamp(56px, 8vw, 100px);
  background: radial-gradient(circle at 12% 0%, rgba(122, 36, 29, 0.5), rgba(7, 12, 22, 0) 62%);
}

.page-about .about-close__inner {
  max-width: 760px;
}

.page-about .about-close__inner p {
  margin: 18px 0 0;
  font-size: clamp(15px, 1.5vw, 16px);
  line-height: 1.92;
  color: var(--bone-soft);
}

.page-about .about-close__links {
  margin-top: clamp(26px, 4vw, 38px);
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 560px) {
  .page-about .about-cover__meta {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 20px;
  }

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

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

@media (min-width: 900px) {
  .page-about .about-map__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
    align-items: start;
    gap: clamp(32px, 4vw, 56px);
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.82fr);
    align-items: center;
    gap: clamp(36px, 4.5vw, 60px);
  }

  .page-about .about-partners__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.9fr);
    align-items: start;
    gap: clamp(30px, 4vw, 52px);
  }

  .page-about .window-strip {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
}

@media (min-width: 1024px) {
  .page-about .about-version__grid {
    grid-template-columns: minmax(0, 0.86fr) minmax(0, 1fr);
    align-items: start;
    gap: clamp(34px, 4vw, 58px);
  }

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

@media (max-width: 480px) {
  .page-about .about-cover__title {
    font-size: 28px;
  }

  .page-about .region-file__num {
    font-size: 12px;
  }

  .page-about .version-node {
    padding-left: 34px;
  }

  .page-about .version-track::before {
    left: 11px;
  }

  .page-about .version-node::before {
    left: 5px;
    top: 20px;
    width: 12px;
    height: 12px;
  }
}