.page-about {
  --about-rail: 28px;
  --about-rail-x: 9px;
  background: var(--fx-cream);
  color: var(--fx-ink);
  font-family: var(--font-sans);
  overflow-x: clip;
}

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

.page-about .breadcrumb {
  margin: 0 0 1.5rem;
}

.page-about .breadcrumb-current {
  color: var(--fx-grey);
  font-size: .8125rem;
  letter-spacing: .04em;
}

.page-about .about-link {
  color: var(--fx-orange-deep);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .section--ink .about-link {
  color: var(--fx-mint);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  background: var(--fx-ink);
  color: var(--fx-white);
  padding: calc(var(--header-space) + 2rem) 0 3rem;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background-image: repeating-linear-gradient(90deg, var(--fx-line-soft) 0 1px, transparent 1px 88px);
  opacity: .5;
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  z-index: -1;
  right: -15%;
  top: -25%;
  width: 70%;
  height: 90%;
  background: radial-gradient(circle at center, rgba(255, 90, 31, .26), transparent 68%);
  pointer-events: none;
}

.page-about .about-hero-grid {
  display: grid;
  gap: 2rem;
  align-items: end;
  margin-top: 1.5rem;
}

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

.page-about .about-hero h1 {
  margin: 1rem 0 0;
  font-size: clamp(2.05rem, 7vw, 3.9rem);
  line-height: 1.06;
  letter-spacing: -.02em;
  font-weight: 900;
  color: var(--fx-white);
}

.page-about .about-hero h1 .hl {
  color: var(--fx-orange);
}

.page-about .about-lede {
  margin: 1.1rem 0 0;
  max-width: 34em;
  font-size: 1.0625rem;
  line-height: 1.7;
  color: var(--fx-grey);
}

.page-about .about-hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem 2.25rem;
  margin-top: 1.9rem;
  padding-top: 1.4rem;
  border-top: 1px solid var(--fx-line);
}

.page-about .about-hero-stats .stat {
  display: flex;
  flex-direction: column;
  gap: .2rem;
  min-width: 6rem;
}

.page-about .about-hero-stats .stat-value {
  font-family: var(--font-mono);
  font-size: 2.25rem;
  font-weight: 700;
  line-height: 1;
  color: var(--fx-white);
  font-variant-numeric: tabular-nums;
}

.page-about .about-hero-stats .stat-unit {
  font-size: .75rem;
  letter-spacing: .08em;
  color: var(--fx-mint);
}

.page-about .about-hero-stats .stat-label {
  font-size: .75rem;
  letter-spacing: .04em;
  color: var(--fx-grey);
}

.page-about .about-hero-media {
  margin: 0;
  border: 1px solid var(--fx-line);
  background: var(--fx-ink-2);
  overflow: hidden;
  clip-path: polygon(0 0, 100% 0, 100% 93%, 0 100%);
}

.page-about .about-hero-media img {
  width: 100%;
  height: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

/* ---------- 章节通用 ---------- */
.page-about .section {
  padding: 3rem 0;
}

.page-about .section-index {
  display: block;
  margin-bottom: .7rem;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .14em;
  color: var(--fx-orange-deep);
}

.page-about .section--ink .section-index {
  color: var(--fx-mint);
}

.page-about .section-title {
  margin: 0;
  font-size: clamp(1.55rem, 4.6vw, 2.55rem);
  line-height: 1.12;
  letter-spacing: -.02em;
  font-weight: 800;
  color: var(--fx-ink);
}

.page-about .section--ink .section-title {
  color: var(--fx-white);
}

.page-about .section-lede {
  margin: .85rem 0 0;
  max-width: 42em;
  font-size: 1rem;
  line-height: 1.7;
  color: var(--fx-grey-ink);
}

.page-about .section--ink .section-lede {
  color: var(--fx-grey);
}

/* ---------- 竖向阶段轴 ---------- */
.page-about .about-timeline {
  position: relative;
  margin-top: 2.25rem;
  padding-left: var(--about-rail);
}

.page-about .about-timeline--tail {
  margin-top: 0;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: calc(var(--about-rail-x) - 1px);
  top: .4rem;
  bottom: .4rem;
  width: 2px;
  background: linear-gradient(180deg, var(--fx-orange) 0%, var(--fx-orange-soft) 40%, var(--fx-line-soft) 100%);
}

.page-about .timeline-node {
  position: relative;
  padding-bottom: 2.5rem;
}

.page-about .timeline-node--tight {
  padding-bottom: 1.75rem;
}

.page-about .timeline-node::before {
  content: "";
  position: absolute;
  top: .5rem;
  left: calc(var(--about-rail-x) - var(--about-rail) - 6px);
  width: 12px;
  height: 12px;
  box-sizing: border-box;
  border-radius: 50%;
  background: var(--fx-cream);
  border: 2px solid var(--fx-orange);
}

.page-about .timeline-node--done::before {
  background: var(--fx-mint);
  border-color: var(--fx-mint);
}

.page-about .node-stage {
  display: inline-block;
  padding: .18rem .5rem;
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .14em;
  color: var(--fx-orange-deep);
  border: 1px solid rgba(179, 59, 12, .35);
  border-radius: var(--radius);
}

.page-about .node-title {
  margin: .7rem 0 0;
  font-size: 1.2rem;
  line-height: 1.25;
  letter-spacing: -.01em;
  font-weight: 800;
  color: var(--fx-ink);
}

.page-about .node-text {
  margin: .55rem 0 0;
  max-width: 44em;
  font-size: .97rem;
  line-height: 1.75;
  color: var(--fx-grey-ink);
}

.page-about .node-flags {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .5rem;
  margin: .85rem 0 0;
  padding: 0;
  list-style: none;
  font-size: .9rem;
}

.page-about .path-media {
  margin: 0 0 2.25rem;
}

.page-about .path-media img {
  width: 100%;
  aspect-ratio: 12 / 5;
  object-fit: cover;
  border: 1px solid var(--fx-line-soft);
  background: var(--fx-ink-2);
}

.page-about .path-media figcaption {
  margin-top: .55rem;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .06em;
  color: var(--fx-grey-ink);
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  gap: 1.75rem;
  margin-top: 2.25rem;
}

.page-about .team-media {
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--fx-line-soft);
}

.page-about .team-media img {
  width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .role-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--fx-line-soft);
  border: 1px solid var(--fx-line-soft);
}

.page-about .role-card {
  background: var(--fx-white);
  padding: 1.15rem 1.15rem 1.3rem;
}

.page-about .role-card .card-index {
  font-family: var(--font-mono);
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .12em;
  color: var(--fx-orange);
}

.page-about .role-title {
  margin: .45rem 0 0;
  font-size: 1.02rem;
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--fx-ink);
}

.page-about .role-text {
  margin: .35rem 0 0;
  font-size: .88rem;
  line-height: 1.65;
  color: var(--fx-grey-ink);
}

/* ---------- 赛事覆盖 ---------- */
.page-about .about-coverage {
  position: relative;
}

.page-about .coverage-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: .5rem;
  margin-top: 1.9rem;
}

.page-about .coverage-cell {
  display: flex;
  align-items: center;
  gap: .5rem;
  padding: .68rem .7rem;
  background: var(--fx-ink-2);
  border: 1px solid var(--fx-line);
  font-size: .82rem;
  line-height: 1.35;
  color: var(--fx-white);
}

.page-about .coverage-dot {
  flex: none;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--fx-mint);
  box-shadow: 0 0 8px rgba(0, 229, 168, .7);
}

.page-about .coverage-cell:nth-child(3n) .coverage-dot {
  background: var(--fx-violet);
  box-shadow: none;
}

.page-about .coverage-note {
  margin: 1.2rem 0 0;
  padding-left: .85rem;
  border-left: 2px solid var(--fx-orange);
  font-family: var(--font-mono);
  font-size: .8rem;
  letter-spacing: .03em;
  line-height: 1.6;
  color: var(--fx-grey);
}

/* ---------- 校准流程 ---------- */
.page-about .flow {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin-top: 1.9rem;
  background: var(--fx-line-soft);
  border: 1px solid var(--fx-line-soft);
}

.page-about .flow-step {
  background: var(--fx-cream);
  padding: 1.15rem 1.15rem 1.3rem;
}

.page-about .step-num {
  font-family: var(--font-mono);
  font-size: 1.45rem;
  font-weight: 700;
  line-height: 1;
  color: rgba(255, 90, 31, .32);
}

.page-about .step-title {
  margin: .5rem 0 0;
  font-size: .98rem;
  font-weight: 800;
  color: var(--fx-ink);
}

.page-about .step-text {
  margin: .3rem 0 0;
  font-size: .87rem;
  line-height: 1.65;
  color: var(--fx-grey-ink);
}

.page-about .accuracy-foot {
  margin: 1.35rem 0 0;
  font-size: .9rem;
  line-height: 1.7;
  color: var(--fx-grey-ink);
}

/* ---------- 合作 ---------- */
.page-about .partner-grid {
  display: grid;
  gap: 1.6rem;
  margin-top: 1.9rem;
}

.page-about .partner-block {
  padding-top: .9rem;
  border-top: 2px solid var(--fx-orange);
}

.page-about .partner-title {
  margin: 0 0 .7rem;
  font-size: 1.02rem;
  font-weight: 800;
  color: var(--fx-ink);
}

.page-about .partner-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: .55rem;
}

.page-about .partner-list li {
  position: relative;
  padding-left: 1.1rem;
  font-size: .9rem;
  line-height: 1.6;
  color: var(--fx-grey-ink);
}

.page-about .partner-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .55em;
  width: 6px;
  height: 6px;
  background: var(--fx-orange);
}

.page-about .partner-text {
  margin: 0 0 .7rem;
  font-size: .9rem;
  line-height: 1.75;
  color: var(--fx-grey-ink);
}

/* ---------- 迭代方向 ---------- */
.page-about .next-grid {
  display: grid;
  gap: 1.5rem;
  margin-top: 1.9rem;
}

.page-about .next-col {
  padding-top: .9rem;
  border-top: 1px solid var(--fx-line);
}

.page-about .next-list {
  margin: 1rem 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: .8rem;
}

.page-about .next-list li {
  position: relative;
  padding-left: 1.35rem;
  font-size: .92rem;
  line-height: 1.6;
  color: var(--fx-grey);
}

.page-about .next-list li::before {
  content: "→";
  position: absolute;
  left: 0;
  color: var(--fx-orange);
  font-family: var(--font-mono);
}

.page-about .about-cta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .85rem 1.25rem;
  margin-top: 2.25rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--fx-line);
  color: var(--fx-white);
}

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-about .role-grid {
    grid-template-columns: 1fr 1fr;
  }

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

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

@media (min-width: 860px) {
  .page-about .about-hero {
    padding: calc(var(--header-space) + 2.5rem) 0 4rem;
  }

  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 3rem;
  }

  .page-about .about-hero-stats .stat-value {
    font-size: 2.6rem;
  }

  .page-about .section {
    padding: 4.5rem 0;
  }

  .page-about .about-timeline {
    --about-rail: 80px;
    --about-rail-x: 25px;
    margin-top: 2.75rem;
  }

  .page-about .timeline-node {
    padding-bottom: 3rem;
  }

  .page-about .node-title {
    font-size: 1.5rem;
  }

  .page-about .node-text {
    font-size: 1rem;
  }

  .page-about .team-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 2.5rem;
    align-items: start;
  }

  .page-about .coverage-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .partner-grid {
    grid-template-columns: 1fr 1fr;
    gap: 2.5rem;
  }

  .page-about .next-grid {
    grid-template-columns: 1fr 1fr;
    gap: 2.5rem;
  }
}

@media (min-width: 1040px) {
  .page-about .flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}