.page-about {
  --about-gap-y: clamp(56px, 8vw, 112px);
  --about-pad-x: clamp(16px, 4vw, 32px);
  --about-edge: 14px;
  color: var(--ab-text);
}

.page-about .ab-breadcrumb {
  padding-top: clamp(18px, 3vw, 28px);
  padding-bottom: 0;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  margin-top: clamp(14px, 2vw, 24px);
  padding: clamp(32px, 6vw, 76px) 0 clamp(64px, 9vw, 124px);
  background:
    linear-gradient(132deg, rgba(22, 48, 42, 0.95) 0%, rgba(14, 31, 26, 0.98) 54%, rgba(8, 17, 15, 1) 100%);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - clamp(40px, 6vw, 84px)), 0 100%);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(116deg,
    transparent 41.6%,
    rgba(59, 232, 168, 0.14) 41.8%,
    rgba(59, 232, 168, 0.14) 42.4%,
    transparent 42.6%,
    transparent 62%,
    rgba(242, 162, 60, 0.12) 62.2%,
    rgba(242, 162, 60, 0.12) 62.6%,
    transparent 62.8%);
}

.page-about .about-hero__inner {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 5vw, 56px);
}

.page-about .about-hero__title {
  margin: 16px 0 0;
  font-size: clamp(2rem, 6.2vw, 4.1rem);
  font-weight: 300;
  line-height: 1.1;
  letter-spacing: -0.03em;
  color: var(--ab-text);
}

.page-about .about-hero__title strong {
  font-weight: 800;
  color: var(--ab-accent);
}

.page-about .about-hero__lead {
  max-width: 36em;
  margin: 20px 0 0;
  font-size: clamp(0.96rem, 1.6vw, 1.08rem);
  line-height: 1.8;
  color: var(--ab-muted);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(28px, 4vw, 44px);
  background: var(--ab-line);
  border: 1px solid var(--ab-line);
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 16px 18px;
  background: rgba(8, 17, 15, 0.72);
}

.page-about .about-stat__num {
  font-family: var(--ab-mono);
  font-size: clamp(1.5rem, 3.4vw, 2rem);
  font-variant-numeric: tabular-nums;
  line-height: 1;
  color: var(--ab-accent);
}

.page-about .about-stat__num small {
  margin-left: 3px;
  font-size: 0.5em;
  color: var(--ab-mint);
}

.page-about .about-stat__label {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--ab-muted);
}

.page-about .about-hero__side {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding-top: 4px;
}

.page-about .about-hero__mark {
  flex: 0 0 auto;
  font-family: var(--ab-mono);
  font-size: clamp(3rem, 9vw, 5.4rem);
  font-weight: 800;
  line-height: 0.9;
  letter-spacing: -0.04em;
  color: rgba(232, 244, 239, 0.07);
  -webkit-text-stroke: 1px var(--ab-line);
}

.page-about .about-hero__note {
  margin: 0;
  padding-left: 16px;
  border-left: 2px solid var(--ab-amber);
  font-size: 0.92rem;
  line-height: 1.75;
  color: var(--ab-muted);
}

/* ---------- 通栏图 ---------- */
.page-about .about-shot {
  margin: clamp(28px, 4vw, 48px) auto 0;
  width: min(100% - (var(--about-pad-x) * 2), 1180px);
}

.page-about .ab-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.78) contrast(1.06) brightness(0.86);
}

.page-about .ab-figure__caption {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ab-muted);
}

/* ---------- 通用章节骨架 ---------- */
.page-about .about-chapter,
.page-about .about-versions,
.page-about .about-team,
.page-about .about-flow {
  padding: var(--about-gap-y) 0 0;
}

.page-about .about-chapter__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 40px);
}

.page-about .about-chapter__aside {
  display: flex;
  align-items: baseline;
  gap: 14px;
}

.page-about .about-chapter__body .ab-title {
  margin-top: 8px;
}

.page-about .about-chapter__body .ab-prose {
  margin-top: 20px;
}

/* ---------- 场馆字段清单 ---------- */
.page-about .about-fields {
  list-style: none;
  margin: clamp(26px, 4vw, 40px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--ab-line);
  border: 1px solid var(--ab-line);
}

.page-about .about-fields__item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 4px;
  padding: 16px 18px;
  background: var(--ab-surface);
}

.page-about .about-fields__k {
  font-family: var(--ab-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--ab-accent);
}

.page-about .about-fields__v {
  font-size: 0.92rem;
  line-height: 1.7;
  color: var(--ab-muted);
}

/* ---------- 版本时间轴 ---------- */
.page-about .about-versions {
  position: relative;
}

.page-about .about-versions::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(180deg, transparent 0%, rgba(22, 48, 42, 0.55) 22%, rgba(22, 48, 42, 0.55) 78%, transparent 100%);
  z-index: 0;
}

.page-about .about-versions__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 48px);
}

.page-about .about-versions__head .ab-title {
  margin-top: 8px;
}

.page-about .about-versions__head .ab-lead {
  margin-top: 16px;
}

.page-about .about-timeline {
  list-style: none;
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding: 0 0 0 30px;
  border-left: 1px solid var(--ab-line);
}

.page-about .about-timeline__item {
  position: relative;
  padding-bottom: 14px;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -35px;
  top: 22px;
  width: 10px;
  height: 10px;
  background: var(--ab-ink);
  border: 1px solid var(--ab-line);
  transform: rotate(45deg);
  transition: border-color 0.3s var(--ab-ease);
}

.page-about .about-timeline__item:last-child::before {
  background: var(--ab-accent);
  border-color: var(--ab-accent);
  box-shadow: 0 0 0 4px rgba(59, 232, 168, 0.16);
}

.page-about .about-node {
  background: var(--ab-surface);
  border: 1px solid var(--ab-line);
  clip-path: polygon(0 0, calc(100% - var(--about-edge)) 0, 100% var(--about-edge), 100% 100%, 0 100%);
}

.page-about .about-node__sum {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 12px;
  padding: 16px 20px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-node__ver {
  font-family: var(--ab-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--ab-accent);
}

.page-about .about-node__title {
  flex: 1 1 12em;
  font-size: 1rem;
  font-weight: 500;
  line-height: 1.5;
  color: var(--ab-text);
}

.page-about .about-node__season {
  font-family: var(--ab-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--ab-muted);
}

.page-about .about-node__toggle {
  flex: 0 0 auto;
  margin-left: auto;
  font-family: var(--ab-mono);
  font-size: 15px;
  color: var(--ab-amber);
}

.page-about .about-node__toggle::before {
  content: "+";
}

.page-about .about-node[open] .about-node__toggle::before {
  content: "−";
}

.page-about .about-node[open] {
  border-color: rgba(59, 232, 168, 0.45);
}

.page-about .about-node__body {
  margin: 0 20px;
  padding: 14px 0 18px;
  border-top: 1px solid var(--ab-line);
  font-size: 0.94rem;
  line-height: 1.8;
  color: var(--ab-muted);
}

.page-about .about-node__body p {
  margin: 0;
}

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

/* ---------- 团队 ---------- */
.page-about .about-team__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 44px);
  align-items: start;
}

.page-about .about-team__main .ab-title {
  margin-top: 8px;
}

.page-about .about-team__main .ab-lead {
  margin-top: 16px;
}

.page-about .about-crew {
  list-style: none;
  margin: clamp(24px, 3vw, 34px) 0 0;
  padding: 0;
  border-top: 1px solid var(--ab-line);
}

.page-about .about-crew__item {
  padding: 18px 0 20px;
  border-bottom: 1px solid var(--ab-line);
}

.page-about .about-crew__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px;
}

.page-about .about-crew__name {
  font-family: var(--ab-mono);
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--ab-mint);
}

.page-about .about-crew__num {
  font-family: var(--ab-mono);
  font-size: 20px;
  font-variant-numeric: tabular-nums;
  color: var(--ab-accent);
}

.page-about .about-crew__text {
  margin: 8px 0 0;
  font-size: 0.92rem;
  line-height: 1.75;
  color: var(--ab-muted);
}

.page-about .about-team__note {
  margin: 22px 0 0;
  padding: 16px 18px;
  background: var(--ab-layer);
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--ab-text);
  clip-path: polygon(0 0, 100% 0, 100% 100%, var(--about-edge) 100%, 0 calc(100% - var(--about-edge)));
}

.page-about .about-team__shot {
  max-width: 520px;
}

/* ---------- 案例合集 ---------- */
.page-about .about-cases {
  margin-top: var(--about-gap-y);
  padding: var(--about-gap-y) 0;
  background: linear-gradient(180deg, rgba(14, 31, 26, 0.9) 0%, rgba(8, 17, 15, 0.98) 100%);
  border-top: 1px solid var(--ab-line);
  border-bottom: 1px solid var(--ab-line);
}

.page-about .about-cases__head .ab-title {
  margin-top: 8px;
}

.page-about .about-cases__head .ab-lead {
  margin-top: 16px;
}

.page-about .about-cases__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
  margin-top: clamp(28px, 4vw, 44px);
}

.page-about .about-case {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 26px 22px 24px;
  border: 1px solid var(--ab-line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
  transition: transform 0.35s var(--ab-ease), border-color 0.35s var(--ab-ease);
}

.page-about .about-case--single {
  background: linear-gradient(158deg, #0f221c 0%, #0b1714 100%);
}

.page-about .about-case--stage {
  background: linear-gradient(158deg, #16302a 0%, #0d1c18 100%);
}

.page-about .about-case--season {
  background: linear-gradient(158deg, #1b3529 0%, #10201a 62%, #17281f 100%);
}

.page-about .about-case:hover,
.page-about .about-case:focus-within {
  transform: translateY(-4px);
  border-color: rgba(59, 232, 168, 0.5);
}

.page-about .about-case__cap {
  position: absolute;
  top: 0;
  right: 0;
  padding: 6px 14px;
  background: var(--ab-layer);
  font-family: var(--ab-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--ab-amber);
}

.page-about .about-case--single .about-case__cap {
  color: var(--ab-mint);
}

.page-about .about-case__title {
  margin: 0;
  font-size: 1.16rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--ab-text);
}

.page-about .about-case__text {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--ab-muted);
}

.page-about .about-case__fields {
  list-style: none;
  margin: auto 0 0;
  padding: 14px 0 0;
  border-top: 1px solid var(--ab-line);
  display: grid;
  gap: 8px;
}

.page-about .about-case__fields li {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  font-family: var(--ab-mono);
  font-size: 12.5px;
}

.page-about .about-case__fields span {
  color: var(--ab-muted);
  letter-spacing: 0.06em;
}

.page-about .about-case__fields strong {
  font-weight: 700;
  color: var(--ab-accent);
  text-align: right;
}

.page-about .about-case:hover .about-case__fields strong {
  color: var(--ab-mint);
}

.page-about .about-cases__more {
  margin: clamp(22px, 3vw, 32px) 0 0;
  font-size: 0.92rem;
  color: var(--ab-muted);
}

.page-about .about-cases__more a {
  color: var(--ab-mint);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 合作生态 ---------- */
.page-about .about-eco {
  padding: var(--about-gap-y) 0 0;
}

.page-about .about-eco__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 40px);
}

.page-about .about-eco__intro .ab-title {
  margin-top: 8px;
}

.page-about .about-eco__intro .ab-lead {
  margin-top: 16px;
}

.page-about .about-eco__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--ab-line);
  border: 1px solid var(--ab-line);
}

.page-about .about-eco__item {
  padding: 20px 18px 22px;
  background: var(--ab-surface);
}

.page-about .about-eco__num {
  display: block;
  font-family: var(--ab-mono);
  font-size: clamp(1.6rem, 4vw, 2.2rem);
  font-variant-numeric: tabular-nums;
  line-height: 1;
  color: var(--ab-accent);
}

.page-about .about-eco__name {
  margin: 10px 0 0;
  font-size: 1rem;
  font-weight: 600;
  color: var(--ab-text);
}

.page-about .about-eco__item p {
  margin: 8px 0 0;
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--ab-muted);
}

.page-about .about-eco__award {
  margin: 0;
  padding: 16px 20px;
  border-left: 2px solid var(--ab-amber);
  background: rgba(22, 48, 42, 0.55);
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--ab-text);
}

/* ---------- 信息流转 ---------- */
.page-about .about-flow__head .ab-title {
  margin-top: 8px;
}

.page-about .about-flow__steps {
  list-style: none;
  margin: clamp(26px, 4vw, 40px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--ab-line);
  border: 1px solid var(--ab-line);
}

.page-about .about-flow__step {
  position: relative;
  padding: 22px 20px 26px;
  background: var(--ab-surface);
}

.page-about .about-flow__step:nth-child(2) {
  background: var(--ab-layer);
}

.page-about .about-flow__step:nth-child(3) {
  background: linear-gradient(160deg, rgba(59, 232, 168, 0.12) 0%, rgba(22, 48, 42, 0.9) 70%);
}

.page-about .about-flow__tag {
  display: inline-block;
  margin-bottom: 12px;
  padding: 4px 10px;
  background: rgba(242, 162, 60, 0.14);
  font-family: var(--ab-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--ab-amber);
}

.page-about .about-flow__title {
  margin: 0;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--ab-text);
}

.page-about .about-flow__step p {
  margin: 10px 0 0;
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--ab-muted);
}

/* ---------- 底部反馈 ---------- */
.page-about .about-cta {
  margin: var(--about-gap-y) 0 0;
  padding: clamp(34px, 5vw, 60px) 0 clamp(44px, 6vw, 76px);
  background: linear-gradient(120deg, #16302a 0%, #0b1714 72%);
  border-top: 1px solid var(--ab-line);
  clip-path: polygon(0 clamp(22px, 4vw, 44px), 100% 0, 100% 100%, 0 100%);
}

.page-about .about-cta__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3vw, 36px);
  align-items: end;
}

.page-about .about-cta__title {
  margin: 0;
  font-size: clamp(1.4rem, 3.4vw, 2.1rem);
  font-weight: 300;
  line-height: 1.25;
  letter-spacing: -0.02em;
  color: var(--ab-text);
}

.page-about .about-cta__text p {
  max-width: 34em;
  margin: 14px 0 0;
  font-size: 0.94rem;
  line-height: 1.8;
  color: var(--ab-muted);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-cta__actions .ab-btn {
  text-decoration: none;
}

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

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

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

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

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

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 8fr) minmax(0, 4fr);
    align-items: end;
  }

  .page-about .about-hero__side {
    flex-direction: column;
    align-items: flex-start;
    gap: 18px;
    padding-bottom: 8px;
  }

  .page-about .about-hero__note {
    padding-left: 14px;
  }

  .page-about .about-chapter__grid {
    grid-template-columns: 168px minmax(0, 1fr);
    gap: clamp(28px, 4vw, 56px);
    align-items: start;
  }

  .page-about .about-chapter__aside {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
    position: sticky;
    top: calc(var(--ab-top-h) + 24px);
  }

  .page-about .about-chapter__body .ab-prose {
    max-width: 720px;
  }

  .page-about .about-versions__grid {
    grid-template-columns: minmax(0, 8fr) minmax(0, 4fr);
    gap: clamp(32px, 4vw, 56px);
    align-items: start;
  }

  .page-about .about-versions__side {
    position: sticky;
    top: calc(var(--ab-top-h) + 24px);
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(32px, 5vw, 64px);
  }

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

  .page-about .about-eco__grid {
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
    gap: clamp(28px, 4vw, 52px);
    align-items: start;
  }

  .page-about .about-eco__list {
    grid-row: span 2;
  }

  .page-about .about-eco__award {
    grid-column: 1;
  }

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

  .page-about .about-cta__actions {
    justify-content: flex-end;
    max-width: 320px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-case,
  .page-about .about-timeline__item::before {
    transition: none;
  }

  .page-about .about-case:hover,
  .page-about .about-case:focus-within {
    transform: none;
  }
}