.page-about {
  --about-rule: rgba(201, 162, 74, .28);
  --about-label-w: 208px;
  background: var(--night);
  color: var(--chalk);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-block: clamp(24px, 3.5vw, 40px) clamp(52px, 7vw, 92px);
  background:
    radial-gradient(140% 120% at 88% -10%, rgba(22, 35, 74, .95) 0%, rgba(14, 23, 48, 0) 62%),
    var(--night);
  border-bottom: 1px solid var(--about-rule);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: 0;
  left: var(--edge);
  right: var(--edge);
  height: 1px;
  background: repeating-linear-gradient(90deg, var(--about-rule) 0 1px, transparent 1px 26px);
  pointer-events: none;
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 48px);
  margin-top: clamp(24px, 4vw, 44px);
}

.page-about .about-hero__lead h1 {
  margin: 0 0 clamp(16px, 2vw, 22px);
  font-size: clamp(34px, 6.2vw, 74px);
  font-weight: 800;
  line-height: 1.06;
  letter-spacing: -.025em;
  color: #FFFFFF;
  text-wrap: balance;
}

.page-about .about-hero__lead .lede {
  margin: 0;
  max-width: 62ch;
  font-size: clamp(16px, 1.55vw, 19px);
  line-height: 1.78;
  color: var(--chalk);
}

.page-about .about-hero__meta {
  margin: clamp(16px, 2vw, 22px) 0 0;
  padding-top: clamp(14px, 2vw, 18px);
  border-top: 1px solid var(--line);
  max-width: 62ch;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .04em;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-hero__readout {
  border: 1px solid var(--about-rule);
  border-radius: var(--radius);
  padding: clamp(18px, 2.6vw, 28px);
  background: linear-gradient(180deg, rgba(22, 35, 74, .9), rgba(14, 23, 48, .6));
  box-shadow: 0 1px 0 rgba(201, 162, 74, .12), 0 22px 46px -32px rgba(0, 0, 0, .9);
}

.page-about .about-hero__big {
  margin: .16em 0 .38em;
  font-family: var(--font-mono);
  font-size: clamp(62px, 11vw, 106px);
  font-weight: 700;
  line-height: .88;
  letter-spacing: -.04em;
  color: var(--gold);
}

.page-about .about-hero__split {
  margin: 0;
  display: grid;
  grid-template-columns: 1fr;
}

.page-about .about-hero__split > div {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  padding: .55rem 0;
}

.page-about .about-hero__split > div + div {
  border-top: 1px solid var(--line);
}

.page-about .about-hero__split dt {
  font-size: 14px;
  color: var(--mist);
}

.page-about .about-hero__split dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  color: var(--gold-light);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-chapter {
  border-top: 1px solid var(--about-rule);
  padding-block: clamp(48px, 6.5vw, 96px);
}

.page-about .about-hero + .about-chapter {
  border-top: 0;
}

.page-about .chapter-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(18px, 2.5vw, 28px);
}

.page-about .chapter-side .label {
  color: var(--gold);
  letter-spacing: .18em;
}

.page-about .chapter-main > h2 {
  margin: 0 0 clamp(14px, 2vw, 22px);
  font-size: clamp(24px, 3.1vw, 42px);
  font-weight: 800;
  line-height: 1.16;
  letter-spacing: -.018em;
  color: #FFFFFF;
  text-wrap: balance;
}

.page-about .chapter-main > p {
  margin: 0 0 clamp(16px, 2vw, 22px);
  max-width: 68ch;
  font-size: clamp(16px, 1.5vw, 17.5px);
  line-height: 1.78;
  color: var(--chalk);
}

.page-about .chapter-note {
  margin: clamp(22px, 3vw, 32px) 0 0;
  max-width: 68ch;
  padding-left: clamp(14px, 1.8vw, 20px);
  border-left: 2px solid var(--about-rule);
  font-size: 15px;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .chapter-note a {
  color: var(--gold-light);
  text-decoration: none;
  border-bottom: 1px solid var(--about-rule);
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .chapter-note a:hover {
  color: #fff;
  border-bottom-color: var(--gold);
}

/* ---------- 图片框 ---------- */
.page-about .about-figure {
  position: relative;
  margin: clamp(22px, 3vw, 34px) 0;
  padding: clamp(10px, 1.4vw, 16px);
  border: 1px solid var(--line);
  background: var(--indigo);
}

.page-about .about-figure::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 48px;
  height: 2px;
  background: var(--gold);
}

.page-about .about-figure .media__frame {
  overflow: hidden;
  background: var(--night);
}

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

.page-about .about-figure .media__caption {
  display: block;
  margin-top: .7rem;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .03em;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 01 团队刻度条 ---------- */
.page-about .team-scale {
  list-style: none;
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .team-scale__row {
  padding: clamp(18px, 2.4vw, 26px) 0;
  border-bottom: 1px solid var(--line);
}

.page-about .team-scale__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
}

.page-about .team-scale__head h3 {
  margin: 0;
  font-size: clamp(17px, 2vw, 21px);
  font-weight: 700;
  letter-spacing: .015em;
  color: var(--chalk);
}

.page-about .team-scale__num {
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.4vw, 38px);
  font-weight: 700;
  line-height: 1;
  color: var(--gold);
}

.page-about .team-scale__bar {
  position: relative;
  height: 6px;
  margin: .8rem 0 .7rem;
  background: rgba(42, 53, 82, .95);
  overflow: hidden;
}

.page-about .team-scale__bar > span {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--gold), var(--gold-light));
  transition: background var(--dur) var(--ease);
}

.page-about .team-scale__row:nth-child(1) .team-scale__bar > span { width: 33%; }
.page-about .team-scale__row:nth-child(2) .team-scale__bar > span { width: 26%; }
.page-about .team-scale__row:nth-child(3) .team-scale__bar > span { width: 41%; }

.page-about .team-scale__row:hover .team-scale__bar > span {
  background: linear-gradient(90deg, var(--gold-light), #F6E4B4);
}

.page-about .team-scale__desc {
  margin: 0;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.76;
  color: var(--mist);
}

/* ---------- 02 流程三段 ---------- */
.page-about .flow-steps {
  list-style: none;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .flow-steps__item {
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr);
  gap: clamp(12px, 2vw, 22px);
  padding: clamp(18px, 2.4vw, 26px) 0;
  border-bottom: 1px solid var(--line);
  transition: background var(--dur) var(--ease);
}

.page-about .flow-steps__item:hover {
  background: rgba(22, 35, 74, .55);
}

.page-about .flow-steps__no {
  padding-top: .3em;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .14em;
  color: var(--gold);
}

.page-about .flow-steps__item h3 {
  margin: 0 0 .5rem;
  font-size: clamp(17px, 1.9vw, 20px);
  font-weight: 700;
  color: #FFFFFF;
}

.page-about .flow-steps__item p {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--chalk);
}

/* ---------- 03 赛区注记 ---------- */
.page-about .zone-notes {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(14px, 2vw, 20px);
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .zone-notes__item {
  padding: clamp(16px, 2.2vw, 24px);
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(22, 35, 74, .72), rgba(14, 23, 48, .38));
  box-shadow: 0 1px 0 rgba(255, 255, 255, .02);
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .zone-notes__item:hover {
  border-color: var(--gold);
  transform: translateY(-2px);
}

.page-about .zone-notes__item h3 {
  margin: 0 0 .55rem;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: .02em;
  color: #FFFFFF;
}

.page-about .zone-notes__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.76;
  color: var(--chalk);
}

/* ---------- 04 名额与金额 ---------- */
.page-about .keep-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin-top: clamp(22px, 3vw, 32px);
  border: 1px solid var(--line);
  background: var(--line);
}

.page-about .keep-card {
  padding: clamp(18px, 2.4vw, 28px);
  background: linear-gradient(180deg, rgba(22, 35, 74, .92), rgba(14, 23, 48, .86));
  transition: background var(--dur) var(--ease);
}

.page-about .keep-card:hover {
  background: var(--indigo);
}

.page-about .keep-card__num {
  margin: .32em 0 .1em;
  font-family: var(--font-mono);
  font-size: clamp(38px, 5vw, 54px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--gold);
}

.page-about .keep-card__unit {
  margin: 0 0 .9rem;
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--mist);
}

.page-about .keep-card__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--chalk);
}

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

.page-about .keep-list li {
  padding: .5rem 0;
  border-top: 1px solid rgba(42, 53, 82, .95);
  font-size: 15px;
  line-height: 1.6;
  color: var(--chalk);
}

.page-about .keep-list li::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  margin-right: .6rem;
  border: 1px solid var(--gold);
  vertical-align: middle;
}

/* ---------- 05 专题线 ---------- */
.page-about .topic-list {
  list-style: none;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  border-block: 1px solid var(--line);
  background: var(--line);
}

.page-about .topic-list__item {
  display: grid;
  gap: .38rem;
  padding: clamp(16px, 2vw, 22px);
  background: var(--night);
  transition: background var(--dur) var(--ease);
}

.page-about .topic-list__item:hover {
  background: var(--indigo);
}

.page-about .topic-list__name {
  font-size: 17px;
  font-weight: 700;
  letter-spacing: .015em;
  color: var(--chalk);
  transition: color var(--dur) var(--ease);
}

.page-about .topic-list__item:hover .topic-list__name {
  color: var(--gold-light);
}

.page-about .topic-list__desc {
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--mist);
}

/* ---------- 06 合作数据条 ---------- */
.page-about .about-strip {
  margin-top: clamp(22px, 3vw, 32px);
  border: 1px solid var(--about-rule);
  background: rgba(22, 35, 74, .5);
}

.page-about .about-strip__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(28px, 3.6vw, 40px);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -.02em;
  color: var(--gold);
}

.page-about .about-strip__label {
  display: block;
  margin-top: .4rem;
  font-size: 13.5px;
  line-height: 1.62;
  color: var(--mist);
}

/* ---------- 05 时间线 ---------- */
.page-about .timeline {
  list-style: none;
  position: relative;
  margin: clamp(24px, 3.5vw, 38px) 0 0;
  padding: 0 0 0 clamp(18px, 3vw, 30px);
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 3px;
  top: 1rem;
  bottom: 1rem;
  width: 1px;
  background: linear-gradient(180deg, var(--gold) 0%, rgba(201, 162, 74, .16) 100%);
}

.page-about .timeline__item {
  position: relative;
  padding-block: .25rem;
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: calc(-1 * clamp(18px, 3vw, 30px));
  top: 1.2rem;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  border: 1px solid var(--gold);
  background: var(--night);
  transition: background var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .timeline__item:hover::before {
  background: var(--gold);
  box-shadow: 0 0 0 4px rgba(201, 162, 74, .18);
}

.page-about .timeline__year {
  margin-right: .7em;
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: .08em;
  color: var(--gold);
}

.page-about .timeline__item details > summary {
  padding-block: .55rem;
}

.page-about .timeline__item details > .fold__body p {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--chalk);
}

/* ---------- 结尾 ---------- */
.page-about .about-cta {
  border-top: 1px solid var(--about-rule);
  padding-block: clamp(48px, 6vw, 88px) clamp(56px, 7vw, 96px);
}

.page-about .about-cta__box {
  display: grid;
  gap: clamp(14px, 2vw, 20px);
  padding: clamp(24px, 4vw, 52px);
  border: 1px solid var(--about-rule);
  border-radius: var(--radius);
  background:
    radial-gradient(120% 140% at 100% 0%, rgba(201, 162, 74, .15), rgba(201, 162, 74, 0) 58%),
    linear-gradient(180deg, rgba(22, 35, 74, .92), rgba(14, 23, 48, .72));
}

.page-about .about-cta__box h2 {
  margin: 0;
  font-size: clamp(24px, 3vw, 36px);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -.018em;
  color: #FFFFFF;
}

.page-about .about-cta__box > p {
  margin: 0;
  max-width: 62ch;
  font-size: clamp(15.5px, 1.5vw, 17px);
  line-height: 1.78;
  color: var(--chalk);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  margin-top: .4rem;
}

.page-about .about-cta__note {
  margin-top: .2rem;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.8;
  color: var(--mist);
  overflow-wrap: anywhere;
}

/* ---------- 响应式 ---------- */
@media (min-width: 680px) {
  .page-about .zone-notes {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1fr) minmax(250px, 322px);
    align-items: end;
  }

  .page-about .chapter-grid {
    grid-template-columns: var(--about-label-w) minmax(0, 1fr);
    gap: clamp(32px, 5vw, 76px);
  }

  .page-about .chapter-side {
    position: sticky;
    top: 92px;
    align-self: start;
  }

  .page-about .zone-notes {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 420px) {
  .page-about .flow-steps__item {
    grid-template-columns: 30px minmax(0, 1fr);
  }

  .page-about .about-cta__actions .btn {
    width: 100%;
    text-align: center;
  }
}