.page-about {
  --about-node: 34px;
  --about-gap: 22px;
  padding: clamp(20px, 3vw, 44px) 0 0;
  background-image:
    radial-gradient(900px 420px at 88% -6%, rgba(53, 232, 166, .10), transparent 62%),
    radial-gradient(720px 360px at 2% 46%, rgba(124, 92, 255, .07), transparent 60%);
  background-repeat: no-repeat;
}

.page-about img {
  max-width: 100%;
  height: auto;
}

.page-about .breadcrumbs {
  margin-bottom: clamp(20px, 3vw, 32px);
}

/* ---------- 首屏 ---------- */

.page-about .about-intro {
  display: grid;
  gap: 16px;
  padding-bottom: clamp(28px, 4vw, 44px);
}

.page-about .about-intro .label {
  color: var(--cyan);
}

.page-about .about-intro__title {
  margin: 0;
  font-size: clamp(34px, 6.6vw, 76px);
  line-height: 1.02;
  letter-spacing: -0.02em;
  color: var(--white);
  max-width: 20em;
}

.page-about .about-intro__lede {
  margin: 0;
  max-width: 44em;
}

.page-about .about-intro__strip {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 14px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
}

.page-about .about-intro__strip-note {
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--silver);
}

.page-about .about-hero {
  margin: 0 0 clamp(40px, 6vw, 72px);
  border: 1px solid var(--line);
  border-left: 4px solid var(--moss);
  background: var(--panel);
  overflow: hidden;
}

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

/* ---------- 竖向刻度时间轴 ---------- */

.page-about .about-timeline .section__head {
  margin-bottom: clamp(28px, 4vw, 44px);
}

.page-about .track {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: clamp(22px, 3vw, 34px);
}

.page-about .track::before {
  content: "";
  position: absolute;
  left: calc(var(--about-node) / 2 - 1px);
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan) 0%, var(--line) 26%, var(--line) 100%);
  opacity: .8;
}

.page-about .track__item {
  position: relative;
  display: grid;
  grid-template-columns: var(--about-node) minmax(0, 1fr);
  gap: var(--about-gap);
  align-items: start;
}

.page-about .track__node {
  width: var(--about-node);
  height: var(--about-node);
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: var(--ink);
  border: 2px solid var(--line);
  color: var(--silver);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0;
  transition:
    background var(--dur) var(--ease),
    border-color var(--dur) var(--ease),
    color var(--dur) var(--ease),
    box-shadow var(--dur) var(--ease);
}

.page-about .track__item.is-visible .track__node {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--ink);
  box-shadow: 0 0 0 6px rgba(53, 232, 166, .10);
}

.page-about .track__card {
  border-left-width: 4px;
  border-left-color: var(--moss);
  transition: border-color var(--dur) var(--ease);
}

.page-about .track__item.is-visible .track__card {
  border-left-color: var(--cyan);
}

.page-about .track__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px 18px;
  flex-wrap: wrap;
  margin-bottom: 10px;
}

.page-about .track__title {
  margin: 0;
  font-size: clamp(19px, 2.4vw, 26px);
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .track__ver {
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--orange);
}

.page-about .track__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--text);
  max-width: 62ch;
}

.page-about .track__more {
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px solid var(--line);
}

.page-about .track__more summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--cyan);
}

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

.page-about .track__more summary::after {
  content: "＋";
  font-family: var(--font-mono);
  font-size: 13px;
  transition: transform var(--dur) var(--ease);
}

.page-about .track__more[open] summary::after {
  content: "－";
}

.page-about .track__more p {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--silver);
  max-width: 62ch;
}

/* ---------- 团队 ---------- */

.page-about .about-team__grid {
  align-items: start;
  row-gap: clamp(28px, 4vw, 44px);
}

.page-about .about-team__col > .lede {
  margin: 12px 0 0;
}

.page-about .roles {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .roles__item {
  display: grid;
  grid-template-columns: 84px minmax(0, 1fr);
  gap: 14px;
  align-items: baseline;
  padding: 13px 16px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-left: 4px solid var(--moss);
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .roles__item:hover {
  border-left-color: var(--cyan);
  transform: translateX(3px);
}

.page-about .roles__key {
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--cyan);
}

.page-about .roles__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--text);
}

.page-about .about-team__media {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--panel);
  overflow: hidden;
}

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

/* ---------- 比赛日班次 ---------- */

.page-about .about-shifts .section__head {
  margin-bottom: clamp(24px, 3.4vw, 38px);
}

.page-about .shifts {
  display: grid;
  gap: 14px;
  grid-template-columns: 1fr;
}

.page-about .shift {
  position: relative;
  padding: 28px 20px 20px;
  background: linear-gradient(180deg, rgba(36, 72, 60, .38), rgba(18, 26, 23, .92));
  border: 1px solid var(--line);
  box-shadow: 8px 8px 0 rgba(0, 0, 0, .35);
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .shift:hover {
  transform: translateY(-4px);
  border-color: var(--moss);
}

.page-about .shift::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 5px;
  background: var(--line);
}

.page-about .shift--pre::before {
  background: var(--cyan);
}

.page-about .shift--live::before {
  background: var(--orange);
}

.page-about .shift--post::before {
  background: var(--violet);
}

.page-about .shift__no {
  margin: 0 0 8px;
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--silver);
}

.page-about .shift__title {
  margin: 0 0 10px;
  font-size: clamp(21px, 2.4vw, 28px);
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .shift__text {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--text);
}

.page-about .shift__hand {
  margin: 0;
  padding-top: 12px;
  border-top: 1px solid var(--line);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--silver);
}

/* ---------- 内容库规模 ---------- */

.page-about .about-coverage .section__head {
  margin-bottom: clamp(22px, 3vw, 34px);
}

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

.page-about .ledger__row {
  display: grid;
  grid-template-columns: minmax(96px, 148px) minmax(0, 1fr);
  gap: 18px;
  align-items: baseline;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .ledger__val {
  font-size: clamp(26px, 4.4vw, 42px);
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--cyan);
  white-space: nowrap;
}

.page-about .ledger__desc {
  font-size: 15px;
  line-height: 1.75;
  color: var(--text);
  max-width: 62ch;
}

/* ---------- 本地化节点 ---------- */

.page-about .about-local__grid {
  align-items: start;
  row-gap: clamp(24px, 3.2vw, 36px);
}

.page-about .about-local__text > .prose {
  margin-top: 14px;
}

.page-about .about-local__meta {
  margin: 22px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--silver);
}

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

.page-about .about-local__media .media {
  margin: 0;
  border: 1px solid var(--line);
  border-left: 4px solid var(--moss);
  background: var(--panel);
  overflow: hidden;
}

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

/* ---------- 选题 ---------- */

.page-about .about-picks .section__head {
  margin-bottom: clamp(22px, 3vw, 34px);
}

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

.page-about .pick {
  border-bottom: 1px solid var(--line);
  transition: background var(--dur) var(--ease);
}

.page-about .pick[open] {
  background: rgba(36, 72, 60, .22);
}

.page-about .pick__q {
  position: relative;
  cursor: pointer;
  list-style: none;
  padding: 18px 48px 18px 18px;
  font-size: clamp(16px, 2vw, 19px);
  font-weight: 600;
  line-height: 1.4;
  letter-spacing: -0.005em;
  color: var(--white);
}

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

.page-about .pick__q::after {
  content: "";
  position: absolute;
  right: 22px;
  top: 50%;
  width: 10px;
  height: 10px;
  margin-top: -7px;
  border-right: 2px solid var(--cyan);
  border-bottom: 2px solid var(--cyan);
  transform: rotate(45deg);
  transition: transform var(--dur) var(--ease);
}

.page-about .pick[open] .pick__q::after {
  transform: rotate(-135deg);
}

.page-about .pick__a {
  padding: 0 18px 20px;
}

.page-about .pick__a p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--text);
  max-width: 66ch;
}

/* ---------- 下一步入口 ---------- */

.page-about .about-next .section__head {
  margin-bottom: clamp(20px, 3vw, 30px);
}

.page-about .next {
  display: grid;
  gap: 12px;
  grid-template-columns: 1fr;
}

.page-about .next__card {
  display: grid;
  gap: 6px;
  padding: 20px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-top: 4px solid var(--moss);
  text-decoration: none;
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .next__card:hover {
  transform: translateY(-4px);
  border-top-color: var(--cyan);
}

.page-about .next__tag {
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--orange);
}

.page-about .next__name {
  font-size: 20px;
  font-weight: 600;
  color: var(--white);
}

.page-about .next__desc {
  font-size: 14px;
  line-height: 1.7;
  color: var(--silver);
}

/* ---------- 响应式 ---------- */

@media (min-width: 760px) {
  .page-about .next {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

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

@media (max-width: 700px) {
  .page-about {
    --about-node: 26px;
    --about-gap: 14px;
  }

  .page-about .track__node {
    font-size: 9px;
  }

  .page-about .roles__item {
    grid-template-columns: 68px minmax(0, 1fr);
    gap: 10px;
    padding: 12px 13px;
  }

  .page-about .ledger__row {
    grid-template-columns: minmax(72px, 94px) minmax(0, 1fr);
    gap: 14px;
  }

  .page-about .about-hero {
    border-left-width: 1px;
  }

  .page-about .pick__q {
    padding: 16px 44px 16px 14px;
  }

  .page-about .pick__a {
    padding: 0 14px 18px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .shift,
  .page-about .next__card,
  .page-about .roles__item,
  .page-about .track__node,
  .page-about .pick__q::after {
    transition: none;
  }

  .page-about .shift:hover,
  .page-about .next__card:hover,
  .page-about .roles__item:hover {
    transform: none;
  }
}