.page-about {
  --about-rail: 196px;
  --about-measure: 66ch;
  background: var(--cream);
  color: var(--black);
}

/* ---------- 首屏 ---------- */
.page-about .about-masthead {
  position: relative;
  overflow: hidden;
  background: var(--ink);
  color: var(--on-ink-strong);
  padding: clamp(120px, 17vh, 184px) 0 clamp(56px, 8vw, 96px);
}

.page-about .about-masthead::before {
  content: "";
  position: absolute;
  top: -32%;
  right: -14%;
  width: min(760px, 74vw);
  height: min(760px, 74vw);
  background: linear-gradient(135deg, rgba(31, 122, 76, 0.34) 0%, rgba(31, 122, 76, 0.06) 46%, rgba(31, 122, 76, 0) 72%);
  transform: rotate(-13deg);
  pointer-events: none;
}

.page-about .about-masthead::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, rgba(31, 122, 76, 0) 0%, rgba(53, 160, 106, 0.75) 28%, rgba(255, 106, 26, 0.6) 68%, rgba(255, 106, 26, 0) 100%);
}

.page-about .about-masthead__inner {
  position: relative;
  z-index: 1;
  max-width: 1000px;
}

.page-about .about-masthead .breadcrumb {
  margin-bottom: clamp(22px, 3.4vw, 38px);
}

.page-about .about-masthead .breadcrumb__link {
  color: rgba(250, 248, 243, 0.72);
  text-decoration: none;
  border-bottom: 1px solid rgba(250, 248, 243, 0.28);
}

.page-about .about-masthead .breadcrumb__link:hover {
  color: var(--on-ink-strong);
  border-bottom-color: var(--orange);
}

.page-about .about-masthead .breadcrumb__sep,
.page-about .about-masthead .breadcrumb__item span {
  color: rgba(250, 248, 243, 0.55);
}

.page-about .about-masthead__eyebrow {
  margin: 0 0 16px;
  font-family: var(--font-body);
  font-size: 12.5px;
  font-weight: 500;
  letter-spacing: 0.18em;
  color: var(--green-lit);
}

.page-about .about-masthead__title {
  margin: 0 0 clamp(20px, 2.6vw, 28px);
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(34px, 5.2vw, 62px);
  line-height: 1.14;
  letter-spacing: 0.01em;
  max-width: 18ch;
}

.page-about .about-masthead__lede {
  margin: 0;
  max-width: 62ch;
  font-size: clamp(16px, 1.5vw, 18.5px);
  line-height: 1.85;
  color: var(--on-ink);
}

.page-about .about-scale {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(36px, 5vw, 60px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--line-dark);
  border: 1px solid var(--line-dark);
}

.page-about .about-scale__item {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 20px 18px 22px;
  background: var(--ink);
}

.page-about .about-scale__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  color: var(--orange);
}

.page-about .about-scale__label {
  font-size: 13px;
  line-height: 1.5;
  letter-spacing: 0.04em;
  color: var(--on-ink);
}

/* ---------- 布局骨架 ---------- */
.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 56px);
  padding-top: clamp(52px, 7vw, 92px);
  padding-bottom: clamp(52px, 7vw, 92px);
}

.page-about .about-rail {
  display: none;
}

.page-about .about-rail__title {
  margin: 0 0 16px;
  padding-top: 12px;
  border-top: 1px solid var(--ink);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--rock);
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
}

.page-about .about-rail__link {
  position: relative;
  display: block;
  padding: 8px 0 8px 16px;
  border-left: 1px solid var(--line);
  font-size: 14px;
  line-height: 1.5;
  color: var(--rock);
  text-decoration: none;
  transition: color 0.22s var(--ease), border-left-color 0.22s var(--ease);
}

.page-about .about-rail__link::before {
  content: "";
  position: absolute;
  left: -2px;
  top: 50%;
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: var(--line);
  transform: translateY(-50%);
  transition: background 0.22s var(--ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--ink);
  border-left-color: var(--green);
}

.page-about .about-rail__link:hover::before,
.page-about .about-rail__link:focus-visible::before {
  background: var(--green-lit);
}

.page-about .about-stream {
  display: grid;
  gap: clamp(22px, 3vw, 36px);
  min-width: 0;
}

/* ---------- 章节 ---------- */
.page-about .about-chapter {
  padding: clamp(28px, 3.4vw, 48px) clamp(20px, 3vw, 46px);
  border: 1px solid var(--line);
  border-radius: var(--rad);
  min-width: 0;
}

.page-about .about-chapter--paper {
  background: var(--cream);
  box-shadow: var(--shadow-1);
}

.page-about .about-chapter--tint {
  background: var(--cool);
  border-color: var(--line-soft);
}

.page-about .about-chapter .plate {
  margin: 0 0 6px;
}

.page-about .about-chapter__title {
  margin: 12px 0 clamp(16px, 2vw, 22px);
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(24px, 2.7vw, 36px);
  line-height: 1.28;
  color: var(--ink);
  max-width: 26ch;
}

.page-about .about-chapter > p:not(.plate) {
  margin: 0 0 1.1em;
  max-width: var(--about-measure);
  font-size: 16.5px;
  line-height: 1.8;
  color: var(--black);
}

.page-about .about-chapter > p:not(.plate):last-child {
  margin-bottom: 0;
}

/* ---------- 图片框 ---------- */
.page-about .about-figure {
  margin: clamp(24px, 3vw, 36px) 0 0;
}

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

.page-about .about-figure--tall.media-frame {
  aspect-ratio: 4 / 5;
  margin-top: 0;
}

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

/* ---------- 团队分工 ---------- */
.page-about .about-team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3vw, 40px);
  margin-top: clamp(20px, 3vw, 32px);
}

.page-about .about-team-wrap {
  min-width: 0;
}

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

.page-about .about-team__card {
  padding: 20px 22px;
  background: var(--cream);
}

.page-about .about-team__size {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--rock);
}

.page-about .about-team__num {
  margin-right: 3px;
  font-size: 26px;
  font-weight: 700;
  color: var(--green);
}

.page-about .about-team__name {
  margin: 0 0 8px;
  font-family: var(--font-body);
  font-size: 17px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--ink);
}

.page-about .about-team__card p:last-child {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--rock);
}

.page-about .about-team__foot {
  margin: 20px 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--rock);
}

/* ---------- 流程时间轴 ---------- */
.page-about .about-flow {
  list-style: none;
  margin: clamp(24px, 3vw, 36px) 0 0;
  padding: 0;
  border-left: 1px solid var(--line);
}

.page-about .about-flow__step {
  position: relative;
  padding: 0 0 clamp(22px, 2.8vw, 32px) clamp(22px, 3vw, 34px);
}

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

.page-about .about-flow__step::before {
  content: "";
  position: absolute;
  left: -4px;
  top: 7px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 0 3px var(--cream);
}

.page-about .about-flow__time {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--clay);
}

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

.page-about .about-flow__step p {
  margin: 0;
  max-width: 58ch;
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--rock);
}

/* ---------- 联赛矩阵 ---------- */
.page-about .about-matrix {
  position: relative;
  overflow: hidden;
  background: var(--ink);
  color: var(--on-ink-strong);
  padding: clamp(56px, 8vw, 96px) 0 0;
}

.page-about .about-matrix .plate {
  margin: 0 0 6px;
}

.page-about .about-matrix__title {
  margin: 12px 0 clamp(16px, 2vw, 22px);
  max-width: 30ch;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(24px, 2.7vw, 36px);
  line-height: 1.28;
  color: var(--on-ink-strong);
}

.page-about .about-matrix__lede {
  margin: 0 0 clamp(28px, 4vw, 40px);
  max-width: 64ch;
  font-size: 16.5px;
  line-height: 1.82;
  color: var(--on-ink);
}

.page-about .about-leagues {
  list-style: none;
  margin: 0 0 clamp(24px, 3vw, 32px);
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-dark);
  border: 1px solid var(--line-dark);
}

.page-about .about-league {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 18px 18px 20px;
  background: var(--ink);
  transition: background 0.24s var(--ease);
}

.page-about .about-league:hover {
  background: var(--ink-soft);
}

.page-about .about-league__name {
  font-size: 16px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--on-ink-strong);
}

.page-about .about-league__tag {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--green-lit);
}

.page-about .about-matrix__note {
  margin: 0 0 clamp(36px, 5vw, 60px);
  padding-top: 18px;
  border-top: 1px solid var(--line-dark);
  font-size: 14px;
  line-height: 1.8;
  letter-spacing: 0.02em;
  color: var(--on-ink);
}

.page-about .about-band.media-frame {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 7;
  margin: 0;
  border-radius: 0;
}

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

/* ---------- 下方内容区 ---------- */
.page-about .about-lower {
  padding-top: clamp(56px, 8vw, 96px);
  padding-bottom: clamp(56px, 8vw, 96px);
}

.page-about .about-version__title,
.page-about .about-partners__title {
  margin: 12px 0 clamp(16px, 2vw, 22px);
  max-width: 26ch;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(24px, 2.7vw, 36px);
  line-height: 1.28;
  color: var(--ink);
}

.page-about .about-version__lede,
.page-about .about-partners__lede {
  margin: 0;
  max-width: var(--about-measure);
  font-size: 16.5px;
  line-height: 1.8;
  color: var(--black);
}

.page-about .about-version-list {
  margin-top: clamp(28px, 4vw, 42px);
  border-top: 1px solid var(--line);
}

.page-about .about-version__item {
  border-bottom: 1px solid var(--line);
}

.page-about .about-version__head {
  display: grid;
  grid-template-columns: 62px minmax(0, 1fr) 22px;
  align-items: center;
  gap: 14px;
  padding: 18px 2px;
  cursor: pointer;
  list-style: none;
}

.page-about .about-version__head::-webkit-details-marker {
  display: none;
}

.page-about .about-version__tag {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--clay);
}

.page-about .about-version__name {
  font-family: var(--font-head);
  font-size: clamp(18px, 2vw, 22px);
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-version__hint {
  position: relative;
  width: 22px;
  height: 22px;
  color: var(--rock);
}

.page-about .about-version__hint::before,
.page-about .about-version__hint::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  background: currentColor;
  transform: translate(-50%, -50%);
}

.page-about .about-version__hint::before {
  width: 13px;
  height: 1px;
}

.page-about .about-version__hint::after {
  width: 1px;
  height: 13px;
  transition: transform 0.24s var(--ease), opacity 0.24s var(--ease);
}

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

.page-about .about-version__item[open] .about-version__hint {
  color: var(--green);
}

.page-about .about-version__head:focus-visible {
  outline: 1px solid var(--orange);
  outline-offset: 4px;
}

.page-about .about-version__body {
  padding: 0 2px clamp(20px, 2.6vw, 28px) 76px;
}

.page-about .about-version__body p {
  margin: 0 0 12px;
  max-width: 62ch;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--rock);
}

.page-about .about-version__body ul {
  margin: 0;
  padding-left: 18px;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--rock);
}

.page-about .about-version__body li + li {
  margin-top: 6px;
}

.page-about .about-version__foot {
  margin: clamp(26px, 3.4vw, 36px) 0 0;
  max-width: var(--about-measure);
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--black);
}

.page-about .about-inline-link {
  color: var(--green);
  text-decoration: none;
  border-bottom: 1px solid rgba(31, 122, 76, 0.4);
  transition: color 0.2s var(--ease), border-bottom-color 0.2s var(--ease);
}

.page-about .about-inline-link:hover {
  color: var(--ink);
  border-bottom-color: var(--orange);
}

/* ---------- 合作 ---------- */
.page-about .about-partners {
  margin-top: clamp(48px, 6vw, 80px);
  padding: clamp(28px, 3.4vw, 48px) clamp(20px, 3vw, 46px);
  background: var(--cool);
  border: 1px solid var(--line-soft);
  border-radius: var(--rad);
}

.page-about .about-partners .plate {
  margin: 0 0 6px;
}

.page-about .about-partners__list {
  list-style: none;
  margin: clamp(24px, 3vw, 32px) 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .about-partners__item {
  padding: 20px 22px;
  background: var(--cream);
}

.page-about .about-partners__num {
  display: block;
  margin-bottom: 4px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 28px;
  font-weight: 700;
  line-height: 1;
  color: var(--green);
}

.page-about .about-partners__label {
  display: block;
  margin-bottom: 10px;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--ink);
}

.page-about .about-partners__item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--rock);
}

.page-about .about-partners > p {
  margin: 0 0 1em;
  max-width: var(--about-measure);
  font-size: 16px;
  line-height: 1.82;
  color: var(--black);
}

.page-about .about-partners__cta {
  margin: clamp(24px, 3vw, 32px) 0 0 !important;
}

/* ---------- 结尾展签 ---------- */
.page-about .about-colophon {
  background: var(--ink);
  color: var(--on-ink-strong);
  padding: clamp(56px, 8vw, 96px) 0;
}

.page-about .about-colophon__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(32px, 4vw, 56px);
}

.page-about .about-colophon .plate {
  margin: 0 0 6px;
}

.page-about .about-colophon__title {
  margin: 12px 0 clamp(18px, 2.4vw, 26px);
  max-width: 24ch;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(24px, 2.7vw, 36px);
  line-height: 1.28;
  color: var(--on-ink-strong);
}

.page-about .about-colophon__main p {
  margin: 0 0 1.1em;
  max-width: 60ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--on-ink);
}

.page-about .about-colophon__aside-title {
  margin: 0 0 16px;
  padding-top: 12px;
  border-top: 1px solid var(--line-dark);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--green-lit);
}

.page-about .about-colophon__links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-dark);
  border: 1px solid var(--line-dark);
}

.page-about .about-colophon__link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 18px;
  background: var(--ink);
  color: var(--on-ink-strong);
  font-size: 15px;
  line-height: 1.5;
  text-decoration: none;
  transition: background 0.22s var(--ease), color 0.22s var(--ease);
}

.page-about .about-colophon__link:hover,
.page-about .about-colophon__link:focus-visible {
  background: var(--ink-soft);
  color: var(--orange);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-partners__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

  .page-about .about-version__head {
    grid-template-columns: 84px minmax(0, 1fr) 22px;
    gap: 20px;
  }

  .page-about .about-version__body {
    padding-left: 104px;
  }
}

@media (min-width: 900px) {
  .page-about .about-team-grid {
    grid-template-columns: minmax(0, 0.74fr) minmax(0, 1.26fr);
    align-items: start;
  }
}

@media (min-width: 1024px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(40px, 5vw, 84px);
  }

  .page-about .about-rail {
    display: block;
    position: sticky;
    top: 132px;
    align-self: start;
  }

  .page-about .about-colophon__inner {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 1fr);
    align-items: start;
  }
}

@media (min-width: 1180px) {
  .page-about .about-leagues {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-league,
  .page-about .about-rail__link,
  .page-about .about-colophon__link,
  .page-about .about-version__hint::after,
  .page-about .about-inline-link {
    transition: none;
  }
}
</main>