.page-about {
  --about-line: rgba(14, 13, 16, .12);
  --about-line-dark: rgba(246, 241, 233, .18);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background: var(--cream);
  padding: clamp(28px, 5vw, 52px) 0 clamp(46px, 7vw, 88px);
  border-bottom: 3px solid var(--ink);
}

.page-about .about-hero__slash {
  position: absolute;
  top: -20%;
  right: -14%;
  width: 46%;
  height: 140%;
  background: var(--red);
  opacity: .08;
  transform: skewX(-14deg);
  pointer-events: none;
}

.page-about .about-hero .crumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0 0 clamp(24px, 4vw, 40px);
  padding: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--slate);
}

.page-about .about-hero .crumbs li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--mist);
}

.page-about .about-hero .crumbs a {
  color: var(--body-dim);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.page-about .about-hero .crumbs a:hover,
.page-about .about-hero .crumbs a:focus-visible {
  border-bottom-color: var(--red);
  color: var(--red);
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(30px, 5vw, 54px);
}

.page-about .about-hero__main h1 {
  margin: 18px 0 0;
  max-width: 15em;
}

.page-about .about-hero__main .lede {
  margin: 22px 0 0;
  max-width: 42em;
  color: var(--body-dim);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 30px;
}

.page-about .about-hero__aside {
  align-self: start;
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px;
  margin: 0;
  background: var(--ink);
  border: 3px solid var(--ink);
  box-shadow: var(--hard-red);
}

.page-about .about-facts__item {
  background: var(--graphite);
  padding: 18px 16px 20px;
  color: var(--on-dark);
}

.page-about .about-facts__item dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--on-dark-dim);
  margin-bottom: 8px;
}

.page-about .about-facts__item dd {
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: 5px;
}

.page-about .about-facts__item .num {
  font-family: var(--font-cond);
  font-size: clamp(34px, 7vw, 46px);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--white);
  font-variant-numeric: tabular-nums;
}

.page-about .about-facts__item em {
  font-style: normal;
  font-size: 13px;
  color: var(--cyan);
  font-family: var(--font-mono);
  letter-spacing: .06em;
}

/* ---------- 通用区块头 ---------- */
.page-about .about-head {
  max-width: 46em;
  margin-bottom: clamp(30px, 4.5vw, 52px);
}

.page-about .about-head h2 {
  margin: 14px 0 0;
}

.page-about .about-head__lede {
  margin: 16px 0 0;
  color: var(--body-dim);
  max-width: 40em;
}

.page-about .band--ink .about-head__lede {
  color: var(--on-dark-dim);
}

/* ---------- 开篇场景图 ---------- */
.page-about .about-scene {
  padding-top: clamp(34px, 5vw, 58px);
  padding-bottom: clamp(30px, 4vw, 46px);
}

.page-about .about-scene__figure {
  margin: 0;
  border: 3px solid var(--ink);
  box-shadow: var(--hard);
}

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

/* ---------- 团队构成 ---------- */
.page-about .about-crew__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 3px solid var(--ink);
}

.page-about .about-crew__item {
  position: relative;
  display: grid;
  gap: 8px 20px;
  padding: 24px 0 26px;
  border-bottom: 2px solid var(--about-line);
  transition: background-color .3s var(--ease), padding-left .3s var(--ease);
}

.page-about .about-crew__item:hover {
  background: linear-gradient(90deg, rgba(196, 22, 28, .07), transparent 62%);
  padding-left: 14px;
}

.page-about .about-crew__idx {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--red);
}

.page-about .about-crew__name {
  margin: 0;
  font-family: var(--font-cond);
  font-size: 24px;
  font-weight: 700;
  letter-spacing: .01em;
}

.page-about .about-crew__desc {
  margin: 0;
  color: var(--body-dim);
  max-width: 52em;
}

/* ---------- 发展脉络 ---------- */
.page-about .about-history {
  background: var(--cream);
  border-top: 3px solid var(--ink);
}

.page-about .about-history__grid {
  display: grid;
  gap: clamp(28px, 4vw, 52px);
}

.page-about .about-history__rail {
  display: grid;
  gap: 22px;
  align-content: start;
}

.page-about .about-history__figure {
  margin: 0;
  border: 3px solid var(--ink);
  box-shadow: var(--hard);
}

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

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

.page-about .about-years a {
  display: inline-block;
  padding: 8px 14px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .12em;
  text-decoration: none;
  color: var(--body-dim);
  background: var(--white);
  border: 2px solid var(--ink);
  box-shadow: 0 4px 0 0 var(--ink);
  transition: transform .2s var(--ease), box-shadow .2s var(--ease), color .2s var(--ease), background-color .2s var(--ease);
}

.page-about .about-years a:hover,
.page-about .about-years a:focus-visible {
  color: var(--red);
  transform: translateY(-2px);
  box-shadow: 0 6px 0 0 var(--ink);
}

.page-about .about-years a[aria-current="true"] {
  background: var(--ink);
  color: var(--cyan);
  border-color: var(--ink);
  box-shadow: 0 4px 0 0 var(--red);
}

.page-about .about-history__body {
  display: grid;
  gap: 26px;
}

.page-about .about-year {
  position: relative;
  padding: 22px 22px 24px;
  background: var(--white);
  border: 2px solid var(--ink);
  border-left-width: 8px;
  transition: border-left-color .3s var(--ease), transform .3s var(--ease);
}

.page-about .about-year:hover {
  border-left-color: var(--red);
  transform: translateX(4px);
}

.page-about .about-year__mark {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--white);
  background: var(--ink);
  padding: 4px 10px;
  margin-bottom: 12px;
}

.page-about .about-year h3 {
  margin: 0 0 10px;
}

.page-about .about-year p {
  margin: 0;
  color: var(--body-dim);
  max-width: 46em;
}

/* ---------- 比赛周流程 ---------- */
.page-about .about-week__flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .about-week__step {
  position: relative;
  padding: 0 0 30px 34px;
  border-left: 2px dashed var(--about-line-dark);
}

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

.page-about .about-week__dot {
  position: absolute;
  left: -9px;
  top: 4px;
  width: 16px;
  height: 16px;
  background: var(--ink);
  border: 3px solid var(--cyan);
  border-radius: 50%;
}

.page-about .about-week__step:last-child .about-week__dot {
  background: var(--cyan);
  border-color: var(--cyan);
  box-shadow: 0 0 0 5px rgba(35, 216, 206, .18);
}

.page-about .about-week__time {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--cyan);
  margin-bottom: 8px;
}

.page-about .about-week__title {
  margin: 0 0 8px;
  font-family: var(--font-cond);
  font-size: 22px;
  font-weight: 700;
  color: var(--on-dark);
  letter-spacing: .01em;
}

.page-about .about-week__text {
  margin: 0;
  color: var(--on-dark-dim);
  max-width: 40em;
}

/* ---------- 合作生态 ---------- */
.page-about .about-partners__figure {
  margin: 0 0 clamp(32px, 5vw, 56px);
  border-top: 3px solid var(--ink);
  border-bottom: 3px solid var(--ink);
}

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

.page-about .about-partner {
  display: grid;
  gap: 12px;
  align-content: start;
}

.page-about .about-partner__name {
  margin: 0;
  font-family: var(--font-cond);
  font-size: 24px;
  font-weight: 700;
  letter-spacing: .01em;
}

.page-about .about-partner p {
  margin: 0;
  color: var(--body-dim);
}

/* ---------- 标准与认可 ---------- */
.page-about .about-honor {
  border-top: 3px solid var(--ink);
  border-bottom: 3px solid var(--ink);
}

.page-about .about-honor__grid {
  display: grid;
  gap: clamp(30px, 4.5vw, 56px);
}

.page-about .about-honor__text h2 {
  margin: 14px 0 0;
}

.page-about .about-honor__text p {
  margin: 18px 0 0;
  color: var(--body-dim);
  max-width: 40em;
}

.page-about .about-honor__links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 28px;
}

.page-about .about-honor__cards {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  align-content: start;
}

.page-about .about-num {
  padding: 18px 16px 20px;
  background: var(--white);
  border: 2px solid var(--ink);
  box-shadow: var(--hard);
}

.page-about .about-num__value {
  display: block;
  font-family: var(--font-cond);
  font-size: clamp(40px, 8vw, 56px);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--red);
  font-variant-numeric: tabular-nums;
}

.page-about .about-num__unit {
  display: block;
  margin-top: 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--body-dim);
}

.page-about .about-num__note {
  margin: 10px 0 0;
  font-size: 14px;
  color: var(--body-dim);
  line-height: 1.6;
}

/* ---------- 收尾 ---------- */
.page-about .about-next {
  padding-bottom: clamp(52px, 8vw, 96px);
}

.page-about .about-next__box {
  display: grid;
  gap: 26px;
  padding: clamp(26px, 4vw, 44px);
  background: var(--graphite);
  border: 3px solid var(--ink);
  box-shadow: var(--hard-red);
}

.page-about .about-next__lead h2 {
  margin: 14px 0 0;
  color: var(--on-dark);
}

.page-about .about-next__lead p {
  margin: 14px 0 0;
  color: var(--on-dark-dim);
  max-width: 34em;
}

.page-about .about-next__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .about-crew__item {
    grid-template-columns: 56px 190px minmax(0, 1fr);
    align-items: start;
    gap: 0 22px;
  }

  .page-about .about-crew__idx {
    padding-top: 6px;
  }

  .page-about .about-crew__name {
    padding-top: 2px;
  }
}

@media (min-width: 760px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(280px, .85fr);
    align-items: start;
  }

  .page-about .about-partners__grid {
    align-items: stretch;
  }

  .page-about .about-honor__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
    align-items: start;
  }

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

@media (min-width: 900px) {
  .page-about .about-week__flow {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0 26px;
  }

  .page-about .about-week__step {
    padding: 0 0 0 0;
    border-left: 0;
    border-top: 2px dashed var(--about-line-dark);
    padding-top: 26px;
  }

  .page-about .about-week__step:last-child {
    border-top-color: var(--about-line-dark);
    border-left-color: transparent;
  }

  .page-about .about-week__dot {
    left: 0;
    top: -9px;
  }
}

@media (min-width: 1020px) {
  .page-about .about-week__flow {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .page-about .about-history__grid {
    grid-template-columns: minmax(260px, .72fr) minmax(0, 1.28fr);
    align-items: start;
  }

  .page-about .about-history__rail {
    position: sticky;
    top: 96px;
  }

  .page-about .about-years ol {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 10px;
  }

  .page-about .about-years a {
    width: 100%;
    text-align: center;
  }
}