.page-about {
  --about-gap: clamp(44px, 6.5vw, 92px);
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.75;
  overflow-x: hidden;
}

.page-about p {
  max-width: var(--measure);
}

.page-about .section {
  padding: 0 0 var(--about-gap);
}

.page-about .section--tight {
  padding: 0 0 calc(var(--about-gap) * .5);
}

.page-about .headline--sm {
  font-family: var(--font-display);
  font-size: clamp(24px, 3.1vw, 40px);
  font-weight: 800;
  letter-spacing: -0.015em;
  line-height: 1.25;
  margin: 0 0 18px;
}

.page-about .about-lede {
  color: rgba(232, 236, 245, .78);
  margin: 0 0 22px;
}

/* ── 首屏 ───────────────────────────────── */
.page-about .about-hero {
  position: relative;
  padding: 28px 0 calc(var(--about-gap) * .75);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -26%;
  right: -12%;
  width: 72%;
  height: 82%;
  background: radial-gradient(circle at 60% 42%, rgba(41, 224, 208, .16), transparent 62%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: -16%;
  bottom: -34%;
  width: 62%;
  height: 72%;
  background: radial-gradient(circle at 40% 60%, rgba(255, 107, 26, .12), transparent 66%);
  pointer-events: none;
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 26px;
}

.page-about .about-hero__lead .eyebrow {
  margin: 0 0 14px;
}

.page-about .about-hero__lead .headline--xl {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-weight: 900;
  letter-spacing: -0.025em;
  line-height: 1.05;
}

.page-about .about-hero__lead .lede {
  color: rgba(232, 236, 245, .82);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-hero__figure {
  margin: 0;
  border: 1px solid var(--line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), 0 100%);
  background: var(--stand);
}

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

/* ── 数据条 ─────────────────────────────── */
.page-about .stat-strip {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .stat {
  background: var(--stand);
  padding: 18px 16px;
  display: grid;
  gap: 4px;
}

.page-about .stat__value {
  font-family: var(--font-mono);
  font-size: clamp(28px, 4vw, 42px);
  font-weight: 700;
  line-height: 1;
  color: var(--orange);
  letter-spacing: -0.02em;
}

.page-about .stat__label {
  font-size: 13px;
  color: rgba(232, 236, 245, .7);
  line-height: 1.5;
}

/* ── 起点，三栏错位 ──────────────────────── */
.page-about .origin {
  display: grid;
  gap: 22px;
}

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

.page-about .origin__main p + p {
  margin-top: 14px;
}

.page-about .origin__aside {
  padding: 20px 20px 22px;
  border-left: 2px solid var(--cyan);
}

.page-about .origin__aside .note {
  margin: 0;
  font-size: 15px;
  color: rgba(232, 236, 245, .8);
}

/* ── 三支队伍 ───────────────────────────── */
.page-about .crew {
  display: grid;
  gap: 26px;
}

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

.page-about .crew-item {
  padding: 20px 22px;
  background: var(--stand);
  border-left: 3px solid var(--cyan);
  transition: transform .12s var(--ease), box-shadow .12s var(--ease);
}

.page-about .crew-item:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 30px rgba(0, 0, 0, .35);
}

.page-about .crew-item__idx {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--cyan);
  margin-bottom: 6px;
}

.page-about .crew-item h3 {
  margin: 0 0 8px;
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.page-about .crew-item p {
  margin: 0;
  font-size: 15.5px;
  color: rgba(232, 236, 245, .76);
}

.page-about .crew__figure {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--stand);
}

/* ── 赛区版图 ───────────────────────────── */
.page-about .region-strip {
  list-style: none;
  margin: 22px 0 0;
  padding: 0 0 16px;
  display: flex;
  gap: 10px;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  border-bottom: 1px solid var(--line);
}

.page-about .region-chip {
  flex: 0 0 auto;
  scroll-snap-align: start;
  min-width: 114px;
  padding: 12px 14px;
  display: grid;
  gap: 4px;
  background: var(--stand);
  border: 1px solid var(--line);
  transition: transform .15s var(--ease), border-color .15s var(--ease);
}

.page-about .region-chip:hover {
  transform: translateY(-3px);
  border-color: var(--cyan);
}

.page-about .region-chip__name {
  font-size: 16px;
  font-weight: 700;
}

.page-about .region-chip__meta {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--concrete);
}

.page-about .region-chip--hot {
  background: linear-gradient(160deg, rgba(41, 224, 208, .16), rgba(11, 16, 38, .92));
  border-color: rgba(41, 224, 208, .45);
}

.page-about .region-chip--hot .region-chip__meta {
  color: var(--cyan);
}

.page-about .region-figure {
  margin: 26px 0 0;
  border: 1px solid var(--line);
  background: var(--stand);
}

/* ── 三方各自的收获 ─────────────────────── */
.page-about .roles {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .role {
  display: grid;
  gap: 8px;
  padding: 24px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .role__key {
  font-family: var(--font-display);
  font-size: clamp(20px, 2.2vw, 28px);
  font-weight: 800;
  letter-spacing: -0.015em;
  line-height: 1.2;
}

.page-about .role__key span {
  display: block;
  margin-top: 6px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 400;
  letter-spacing: .12em;
  color: var(--orange);
}

.page-about .role__body p {
  margin: 0;
  color: rgba(232, 236, 245, .8);
}

/* ── 时间线 ─────────────────────────────── */
.page-about .journey {
  position: relative;
  margin-top: 26px;
  padding-left: 26px;
}

.page-about .journey::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 8px;
  bottom: 8px;
  border-left: 2px dashed rgba(41, 224, 208, .45);
}

.page-about .journey__item {
  position: relative;
  padding-bottom: 22px;
}

.page-about .journey__item::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 10px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--night);
  border: 2px solid var(--cyan);
}

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

.page-about .stage {
  background: var(--stand);
  border: 1px solid var(--line);
  padding: 18px 20px;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 14px), 0 100%);
}

.page-about .stage__head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .stage__step {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--orange);
}

.page-about .stage__title {
  font-size: 19px;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.page-about .stage__mark {
  margin-left: auto;
  width: 9px;
  height: 9px;
  border-right: 2px solid var(--cyan);
  border-bottom: 2px solid var(--cyan);
  transform: rotate(45deg);
  transition: transform .2s var(--ease);
}

.page-about .stage[open] .stage__mark {
  transform: rotate(-135deg);
}

.page-about .stage__body {
  padding-top: 12px;
}

.page-about .stage__body p {
  margin: 0;
  font-size: 15.5px;
  color: rgba(232, 236, 245, .76);
}

.page-about .stage__list {
  margin: 12px 0 0;
  padding-left: 18px;
  display: grid;
  gap: 6px;
  font-size: 15px;
  color: rgba(232, 236, 245, .8);
}

.page-about .stage__list li::marker {
  color: var(--cyan);
}

/* ── 四个理由 ───────────────────────────── */
.page-about .reasons {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .reason {
  position: relative;
  padding: 24px 22px 26px;
  background: var(--stand);
  border-top: 2px solid var(--line-strong);
  overflow: hidden;
}

.page-about .reason::after {
  content: "";
  position: absolute;
  right: -22%;
  bottom: -58%;
  width: 62%;
  height: 120%;
  background: radial-gradient(circle, rgba(255, 107, 26, .15), transparent 66%);
  pointer-events: none;
}

.page-about .reason__num {
  position: relative;
  font-family: var(--font-mono);
  font-size: 34px;
  font-weight: 700;
  line-height: 1;
  color: var(--orange);
  letter-spacing: -0.02em;
}

.page-about .reason h3 {
  position: relative;
  margin: 12px 0 8px;
  font-size: 19px;
  font-weight: 700;
}

.page-about .reason p {
  position: relative;
  margin: 0;
  max-width: 30em;
  font-size: 15.5px;
  color: rgba(232, 236, 245, .78);
}

/* ── 行动区 ─────────────────────────────── */
.page-about .cta-block {
  padding: 32px 24px;
  background: linear-gradient(122deg, var(--stand-2), var(--night) 72%);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 20px), 0 100%);
}

.page-about .cta-block__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

/* ── 响应式 ─────────────────────────────── */
@media (min-width: 640px) {
  .page-about .stat-strip {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .stat {
    padding: 22px 20px;
  }
}

@media (min-width: 760px) {
  .page-about .reasons {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }
}

@media (min-width: 960px) {
  .page-about .about-hero {
    padding-top: 40px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 44px;
    align-items: center;
  }

  .page-about .about-hero__figure {
    clip-path: polygon(0 0, 100% 0, 100% calc(100% - 34px), 0 100%);
  }

  .page-about .role {
    grid-template-columns: minmax(0, 3fr) minmax(0, 9fr);
    gap: 32px;
    align-items: start;
  }
}

@media (min-width: 1024px) {
  .page-about .origin {
    grid-template-columns: minmax(0, 2fr) minmax(0, 7fr) minmax(0, 3fr);
    gap: 34px;
    align-items: start;
  }

  .page-about .origin__side {
    display: block;
  }

  .page-about .crew {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 32px;
    align-items: start;
  }

  .page-about .journey {
    padding-left: 0;
  }

  .page-about .journey::before {
    left: 50%;
    margin-left: -1px;
  }

  .page-about .journey__item {
    width: calc(50% - 46px);
    padding-bottom: 32px;
  }

  .page-about .journey__item:nth-child(odd) {
    margin-right: calc(50% + 46px);
    text-align: right;
  }

  .page-about .journey__item:nth-child(odd) .stage__head {
    justify-content: flex-end;
  }

  .page-about .journey__item:nth-child(odd) .stage__mark {
    margin-left: 0;
    order: -1;
  }

  .page-about .journey__item:nth-child(odd) .stage__body p {
    margin-left: auto;
  }

  .page-about .journey__item:nth-child(odd) .stage__list {
    width: fit-content;
    margin-left: auto;
    text-align: right;
  }

  .page-about .journey__item:nth-child(even) {
    margin-left: calc(50% + 46px);
  }

  .page-about .journey__item::before {
    left: auto;
    right: -52px;
  }

  .page-about .journey__item:nth-child(even)::before {
    left: -52px;
    right: auto;
  }

  .page-about .cta-block {
    padding: 44px 40px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .crew-item,
  .page-about .region-chip,
  .page-about .stage__mark {
    transition: opacity .1s linear;
  }

  .page-about .crew-item:hover,
  .page-about .region-chip:hover {
    transform: none;
  }
}