.page-about {
  display: block;
  color: var(--bone);
  font-family: var(--font-body);
}

/* ── 上下文与目录 ── */
.page-about .about-context {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 24px;
  align-items: baseline;
  justify-content: space-between;
  padding-top: clamp(20px, 3vw, 34px);
}

.page-about .breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 13px;
  color: var(--stone);
}

.page-about .breadcrumb-item + .breadcrumb-item::before {
  content: "/";
  margin-right: 6px;
  color: var(--stone);
}

.page-about .breadcrumb-link {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .18s ease, border-color .18s ease;
}

.page-about .breadcrumb-link:hover,
.page-about .breadcrumb-link:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--line-cyan);
}

.page-about .about-toc {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 18px;
  font-family: var(--font-serif);
  font-size: 13px;
}

.page-about .about-toc a {
  color: var(--stone);
  text-decoration: none;
  border-bottom: 1px dashed rgba(159, 184, 172, .3);
  padding-bottom: 2px;
  transition: color .18s ease, border-color .18s ease;
}

.page-about .about-toc a:hover,
.page-about .about-toc a:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--line-cyan);
}

/* ── 主题声明块 ── */
.page-about .about-open {
  display: grid;
  gap: 32px;
  margin-top: clamp(34px, 6vw, 68px);
}

@media (min-width: 900px) {
  .page-about .about-open {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 56px;
    align-items: end;
  }
}

.page-about .about-kicker {
  margin: 0 0 14px;
  font-family: var(--font-cond);
  font-size: 13px;
  letter-spacing: .12em;
  color: var(--cyan);
}

.page-about .about-open h1 {
  margin: 0 0 22px;
  font-family: var(--font-cond);
  font-weight: 700;
  letter-spacing: -.02em;
  line-height: 1.16;
  color: var(--bone);
}

.page-about .about-lede {
  margin: 0;
  max-width: 44ch;
  font-family: var(--font-serif);
  font-size: clamp(16.5px, 1.5vw, 19px);
  line-height: 1.9;
  color: var(--bone);
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.page-about .about-stat {
  padding: 16px 16px 14px;
  border: 1px solid var(--line-cyan);
  border-radius: var(--r-md);
  background: linear-gradient(180deg, rgba(28, 63, 51, .55), rgba(14, 42, 34, .9));
}

.page-about .about-stat b {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(23px, 3.2vw, 31px);
  line-height: 1.1;
  font-weight: 600;
  color: var(--amber);
}

.page-about .about-stat span {
  display: block;
  margin-top: 7px;
  font-size: 12.5px;
  line-height: 1.55;
  color: var(--mist);
}

/* ── 通栏横幅 ── */
.page-about .about-banner {
  margin-top: clamp(44px, 8vw, 88px);
}

.page-about .about-banner img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--line-mist);
  border-radius: var(--r-lg);
  filter: saturate(.86);
}

.page-about .about-banner .media-cap,
.page-about .about-method-fig .media-cap,
.page-about .about-season-fig .media-cap {
  display: block;
  margin-top: 12px;
  font-family: var(--font-serif);
  font-size: 13px;
  line-height: 1.7;
  color: var(--stone);
}

/* ── 区块骨架 ── */
.page-about .about-block {
  margin-top: clamp(56px, 9vw, 96px);
}

.page-about .about-block .section-title,
.page-about .about-next .section-title {
  margin: 0;
}

/* ── 签表与轮次：正文 + 旁注 ── */
.page-about .about-split {
  display: grid;
  gap: 28px;
  margin-top: 28px;
}

@media (min-width: 900px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 48px;
  }
}

.page-about .about-body p {
  margin: 0 0 18px;
  max-width: 68ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--bone);
}

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

.page-about .about-body a,
.page-about .about-correct-in a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--line-cyan);
  transition: color .18s ease, border-color .18s ease;
}

.page-about .about-body a:hover,
.page-about .about-correct-in a:hover {
  border-bottom-color: var(--cyan);
}

.page-about .about-margin {
  display: grid;
  gap: 18px;
  align-content: start;
}

.page-about .about-note {
  margin: 0;
  padding: 2px 0 2px 14px;
  border-left: 2px solid var(--clay);
  font-family: var(--font-serif);
  font-size: 13.5px;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-note p {
  margin: 0;
}

.page-about .about-note p + p {
  margin-top: 8px;
}

.page-about .about-note .about-term {
  color: var(--bone);
  font-size: 14px;
}

.page-about .about-term abbr {
  text-decoration: none;
  border-bottom: 1px dashed var(--line-cyan);
  cursor: help;
}

/* ── 编排方法：横向流程条 + 配图 ── */
.page-about .about-method {
  display: grid;
  gap: 30px;
  margin-top: 30px;
}

@media (min-width: 1024px) {
  .page-about .about-method {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 52px;
    align-items: start;
  }
}

.page-about .about-steps {
  display: flex;
  flex-wrap: nowrap;
  gap: 16px;
  margin: 0;
  padding: 6px 6px 20px;
  list-style: none;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  scrollbar-width: thin;
  scrollbar-color: var(--moss) transparent;
}

.page-about .about-step {
  position: relative;
  flex: 0 0 auto;
  width: min(268px, 78vw);
  scroll-snap-align: start;
  padding: 20px 20px 18px;
  border: 1px solid var(--line-cyan);
  border-radius: var(--r-md);
  background: linear-gradient(170deg, rgba(28, 63, 51, .72), rgba(14, 42, 34, .94));
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%);
}

.page-about .about-step + .about-step::before {
  content: "";
  position: absolute;
  left: -16px;
  top: 34px;
  width: 16px;
  height: 1px;
  background: var(--line-cyan);
}

.page-about .about-step-idx {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 40px;
  height: 26px;
  padding: 0 10px;
  margin-bottom: 12px;
  border: 1px solid var(--line-cyan);
  border-radius: var(--pill);
  background: rgba(53, 242, 200, .12);
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 13px;
}

.page-about .about-step .item-title {
  margin: 0 0 8px;
}

.page-about .about-step > p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--mist);
}

.page-about .about-detail {
  margin-top: 14px;
  padding-top: 10px;
  border-top: 1px solid var(--line-mist);
}

.page-about .about-detail summary {
  display: flex;
  align-items: center;
  gap: 8px;
  list-style: none;
  cursor: pointer;
  font-size: 12.5px;
  letter-spacing: .04em;
  color: var(--cyan);
}

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

.page-about .about-detail summary::before {
  content: "";
  flex: 0 0 auto;
  width: 7px;
  height: 7px;
  border-radius: var(--pill);
  background: var(--cyan);
  box-shadow: 0 0 0 3px rgba(53, 242, 200, .14);
  transition: transform .18s ease;
}

.page-about .about-detail[open] summary::before {
  transform: scale(1.35);
}

.page-about .about-detail p {
  margin: 10px 0 0;
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--mist);
}

.page-about .about-method-fig {
  margin: 0;
}

@media (min-width: 1024px) {
  .page-about .about-method-fig {
    position: sticky;
    top: calc(var(--band) + 28px);
  }
}

.page-about .about-method-fig img,
.page-about .about-season-fig img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--line-mist);
  border-radius: var(--r-lg);
}

/* ── 工作组：不等宽色块 ── */
.page-about .about-teams {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 30px;
}

.page-about .about-team {
  flex: 1 1 100%;
  padding: 22px 20px;
  border: 1px solid var(--line-mist);
  border-radius: var(--r-md);
  background: rgba(7, 20, 16, .6);
}

.page-about .about-team-num {
  margin: 0 0 10px;
  font-family: var(--font-body);
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--stone);
}

.page-about .about-team-num b {
  display: inline-block;
  margin-right: 4px;
  font-family: var(--font-mono);
  font-size: 34px;
  line-height: 1;
  font-weight: 600;
  color: var(--amber);
  vertical-align: -2px;
}

.page-about .about-team .item-title {
  margin: 0 0 10px;
}

.page-about .about-team > p:last-child {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--mist);
}

@media (min-width: 900px) {
  .page-about .about-team--a {
    flex: 9 1 0;
    background: linear-gradient(165deg, rgba(53, 242, 200, .12), rgba(14, 42, 34, .94));
    border-color: var(--line-cyan);
  }

  .page-about .about-team--b {
    flex: 6 1 0;
    background: linear-gradient(165deg, rgba(28, 63, 51, .88), rgba(14, 42, 34, .94));
  }

  .page-about .about-team--c {
    flex: 4 1 0;
    background: linear-gradient(165deg, rgba(180, 116, 75, .26), rgba(14, 42, 34, .94));
    border-color: rgba(180, 116, 75, .4);
  }
}

/* ── 赛季演进：纵向阶梯 ── */
.page-about .about-seasons {
  display: grid;
  gap: 32px;
  margin-top: 30px;
}

@media (min-width: 900px) {
  .page-about .about-seasons {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 48px;
    align-items: start;
  }
}

.page-about .about-seasons-list {
  display: grid;
  gap: 12px;
}

.page-about .about-season-item {
  display: grid;
  gap: 8px 22px;
  padding: 18px 20px;
  border-left: 2px solid var(--line-cyan);
  border-radius: 0 var(--r-md) var(--r-md) 0;
  background: rgba(14, 42, 34, .62);
}

@media (min-width: 720px) {
  .page-about .about-season-item {
    grid-template-columns: 116px minmax(0, 1fr);
  }
}

@media (min-width: 900px) {
  .page-about .about-season-item:nth-child(2) {
    margin-left: 22px;
  }

  .page-about .about-season-item:nth-child(3) {
    margin-left: 44px;
  }

  .page-about .about-season-item:nth-child(4) {
    margin-left: 66px;
  }
}

.page-about .about-season-idx {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: .02em;
  color: var(--amber);
}

.page-about .about-season-item .item-title {
  margin: 0 0 7px;
}

.page-about .about-season-item p:last-child {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .about-season-fig {
  margin: 0;
}

/* ── 纠错机制 ── */
.page-about .about-correct {
  display: grid;
  gap: 18px;
  margin-top: 30px;
}

@media (min-width: 820px) {
  .page-about .about-correct {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 24px;
  }
}

.page-about .about-correct-in,
.page-about .about-correct-out {
  padding: 24px 22px;
  border: 1px solid var(--line-cyan);
  border-radius: var(--r-md);
  background: linear-gradient(175deg, rgba(28, 63, 51, .55), rgba(7, 20, 16, .92));
}

.page-about .about-correct-out {
  border-color: rgba(222, 90, 68, .35);
  background: linear-gradient(175deg, rgba(222, 90, 68, .1), rgba(7, 20, 16, .92));
}

.page-about .about-correct .item-title {
  margin: 0;
}

.page-about .about-list {
  display: grid;
  gap: 10px;
  margin: 16px 0 18px;
  padding: 0;
  list-style: none;
}

.page-about .about-list li {
  position: relative;
  padding-left: 20px;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--bone);
}

.page-about .about-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 8px;
  height: 8px;
  border-radius: var(--pill);
  background: var(--cyan);
}

.page-about .about-list--out li::before {
  background: var(--crimson);
}

.page-about .about-correct-in > p:last-child,
.page-about .about-correct-out > p:last-child {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.78;
  color: var(--mist);
}

/* ── 合作与边界 ── */
.page-about .about-partner {
  margin-top: 26px;
  padding: 26px 24px;
  border: 1px solid var(--line-mist);
  border-radius: var(--r-lg);
  background: linear-gradient(150deg, rgba(28, 63, 51, .62), rgba(7, 20, 16, .92));
}

.page-about .about-partner > p {
  margin: 0 0 16px;
  max-width: 68ch;
  font-size: 15.5px;
  line-height: 1.82;
  color: var(--bone);
}

.page-about .about-partner > p:last-of-type {
  margin-bottom: 0;
}

.page-about .about-pillars {
  display: grid;
  gap: 12px;
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
}

@media (min-width: 780px) {
  .page-about .about-pillars {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }
}

.page-about .about-pillars li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 14px 16px;
  border: 1px solid var(--line-mist);
  border-radius: var(--r-md);
  background: rgba(7, 20, 16, .62);
  font-size: 14px;
  line-height: 1.65;
  color: var(--bone);
}

.page-about .about-pillars .tag {
  flex: 0 0 auto;
  margin-top: 1px;
}

/* ── 尾部去向 ── */
.page-about .about-next {
  margin-top: clamp(56px, 9vw, 96px);
}

.page-about .about-next-list {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

@media (max-width: 560px) {
  .page-about .about-next-list {
    flex-direction: column;
  }

  .page-about .about-next-list .btn {
    width: 100%;
    justify-content: center;
    text-align: center;
  }
}