.page-about {
  --about-rail-w: 220px;
  --about-radius: 0;
  background: var(--paper);
  color: var(--ink);
}

/* ------- 面包屑 ------- */
.page-about .crumbs {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 20px var(--shell-pad) 0;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  color: var(--steel);
  text-transform: uppercase;
}
.page-about .crumbs a {
  color: var(--steel);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--t), border-color var(--t);
}
.page-about .crumbs a:hover {
  color: var(--ink);
  border-bottom-color: var(--gold);
}
.page-about .crumbs__sep {
  color: var(--gold);
}
.page-about .crumbs__current {
  color: var(--ink);
  font-weight: 600;
}

/* ------- 首屏 ------- */
.page-about .about-hero {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  padding: 40px var(--shell-pad) 56px;
  border-bottom: var(--bw-thick) solid var(--ink);
  position: relative;
}
.page-about .about-hero::before {
  content: "";
  position: absolute;
  left: var(--shell-pad);
  right: var(--shell-pad);
  top: 0;
  height: 6px;
  background:
    repeating-linear-gradient(
      to right,
      var(--gradient-blue-hint, var(--navy)) 0 1px,
      transparent 1px 64px
    );
  opacity: 0.35;
}
.page-about .about-hero__text {
  max-width: 780px;
}
.page-about .eyebrow {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--steel);
  margin: 0 0 16px;
  display: inline-flex;
  align-items: center;
  gap: 10px;
}
.page-about .eyebrow::before {
  content: "";
  width: 22px;
  height: 2px;
  background: var(--gold);
  display: inline-block;
}
.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-weight: 900;
  letter-spacing: -0.02em;
  font-size: clamp(2.2rem, 5.6vw, 4.4rem);
  line-height: 1.06;
  margin: 0 0 24px;
  color: var(--ink);
}
.page-about .about-hero__lede {
  font-size: 1.05rem;
  line-height: 1.75;
  color: var(--navy);
  max-width: 62ch;
  margin: 0 0 28px;
}
.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 36px;
}
.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  padding-top: 24px;
  border-top: var(--bw) solid var(--line-dark);
}
.page-about .stat {
  border-left: 3px solid var(--gold);
  padding-left: 14px;
}
.page-about .stat__value {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  color: var(--ink);
  line-height: 1;
  letter-spacing: -0.02em;
}
.page-about .stat__label {
  display: block;
  margin-top: 6px;
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: var(--steel);
  text-transform: uppercase;
}
.page-about .about-hero__figure {
  margin: 0;
  border: var(--bw) solid var(--ink);
  box-shadow: var(--shadow-hard);
  background: var(--navy);
  position: relative;
  min-height: 320px;
}
.page-about .about-hero__figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.page-about .media-frame__cap {
  display: block;
  padding: 10px 14px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--cool);
  background: var(--ink);
  border-top: var(--bw) solid var(--gold);
  text-transform: uppercase;
}

/* ------- 主体骨架：索引 + 章节 ------- */
.page-about .about-shell {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  padding: 0 var(--shell-pad) 64px;
}

.page-about .index-rail {
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
  gap: 6px;
  padding: 16px 0 0;
  border-bottom: var(--bw) solid var(--line-dark);
  padding-bottom: 16px;
}
.page-about .index-rail__title {
  width: 100%;
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--steel);
}
.page-about .index-rail__link {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.02em;
  color: var(--navy);
  text-decoration: none;
  padding: 6px 10px;
  border: 1px solid var(--line-dark);
  background: var(--bone);
  transition: background var(--t), color var(--t), border-color var(--t);
}
.page-about .index-rail__link:hover {
  background: var(--ink);
  color: var(--paper);
  border-color: var(--ink);
}
.page-about .index-rail__link[aria-current] {
  background: var(--gold);
  color: var(--ink);
  border-color: var(--gold);
}

.page-about .about-flow {
  display: flex;
  flex-direction: column;
  gap: 72px;
  min-width: 0;
}

.page-about .about-section {
  scroll-margin-top: 96px;
  min-width: 0;
}

.page-about .section-head {
  border-bottom: var(--bw) solid var(--ink);
  padding-bottom: 20px;
  margin-bottom: 32px;
}
.page-about .section-title {
  font-family: var(--font-display);
  font-weight: 900;
  letter-spacing: -0.015em;
  font-size: clamp(1.5rem, 3.4vw, 2.3rem);
  line-height: 1.2;
  color: var(--ink);
  margin: 0 0 14px;
}
.page-about .section-desc {
  font-size: 1rem;
  line-height: 1.75;
  color: var(--navy);
  max-width: 68ch;
  margin: 0;
}

/* ------- 01 使命四宫格 ------- */
.page-about .mission-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  border-top: var(--bw) solid var(--line-dark);
}
.page-about .mission-block {
  padding: 24px 0;
  border-bottom: var(--bw) solid var(--line-dark);
  display: grid;
  grid-template-columns: 48px 1fr;
  column-gap: 16px;
  align-items: start;
}
.page-about .mission-block__num {
  grid-row: span 2;
  font-family: var(--font-mono);
  font-size: 1.4rem;
  color: var(--gold);
  line-height: 1;
  padding-top: 4px;
}
.page-about .mission-block h3 {
  font-size: 1.1rem;
  font-weight: 800;
  letter-spacing: -0.01em;
  margin: 0 0 8px;
  color: var(--ink);
}
.page-about .mission-block p {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--navy);
}

/* ------- 02 时间轴 ------- */
.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}
.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 22px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: repeating-linear-gradient(
    to bottom,
    var(--line-dark) 0 6px,
    transparent 6px 12px
  );
}
.page-about .timeline__item {
  position: relative;
  padding: 0 0 28px 60px;
}
.page-about .timeline__item:last-child {
  padding-bottom: 0;
}
.page-about .timeline__marker {
  position: absolute;
  left: 0;
  top: 0;
  width: 46px;
  height: 46px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--ink);
  color: var(--gold);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  border: var(--bw) solid var(--ink);
  box-shadow: var(--shadow-hard);
  transition: transform var(--t), background var(--t), color var(--t);
}
.page-about .timeline__item:hover .timeline__marker {
  transform: translate(-2px, -2px);
  background: var(--gold);
  color: var(--ink);
}
.page-about .timeline__title {
  font-size: 1.08rem;
  font-weight: 800;
  letter-spacing: -0.01em;
  margin: 2px 0 8px;
  color: var(--ink);
}
.page-about .timeline__body p {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--navy);
  max-width: 62ch;
}
.page-about .timeline__item--media {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}
.page-about .timeline__item--media .media-frame {
  margin: 0;
  border: var(--bw) solid var(--ink);
  box-shadow: var(--shadow-hard);
  background: var(--navy);
}
.page-about .timeline__item--media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ------- 03 数据体系 ------- */
.page-about .awards-tabs {
  display: flex;
  flex-direction: column;
  gap: 0;
}
.page-about .tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 20px;
}
.page-about .tab {
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.02em;
  padding: 10px 18px;
  border: var(--bw) solid var(--ink);
  background: var(--paper);
  color: var(--ink);
  transition: background var(--t), color var(--t), transform var(--t);
  user-select: none;
}
.page-about .tab:hover {
  background: var(--bone);
}
.page-about #about-tab-1:checked ~ .tabs .tab:nth-child(1),
.page-about #about-tab-2:checked ~ .tabs .tab:nth-child(2),
.page-about #about-tab-3:checked ~ .tabs .tab:nth-child(3) {
  background: var(--ink);
  color: var(--gold);
}
.page-about .tabpanel {
  display: none;
  padding: 24px;
  border: var(--bw) solid var(--ink);
  background: var(--bone);
  box-shadow: var(--shadow-hard);
}
.page-about #about-tab-1:checked ~ .tabpanels #about-panel-1,
.page-about #about-tab-2:checked ~ .tabpanels #about-panel-2,
.page-about #about-tab-3:checked ~ .tabpanels #about-panel-3 {
  display: block;
}
.page-about .tabpanel__note {
  margin: 18px 0 0;
  font-size: 0.88rem;
  font-style: italic;
  font-weight: 400;
  line-height: 1.7;
  color: var(--steel);
  border-top: 1px solid var(--line-dark);
  padding-top: 14px;
}

.page-about .chip-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.page-about .chip-list li {
  font-size: 0.86rem;
  padding: 6px 12px;
  background: var(--paper);
  border: 1px solid var(--line-dark);
  color: var(--navy);
  font-weight: 500;
}

.page-about .field-matrix {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}
.page-about .field-group {
  border-top: 2px solid var(--ink);
  padding-top: 12px;
}
.page-about .field-group__key {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--gold);
  margin: 0 0 10px;
}
.page-about .field-group ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.page-about .field-group li {
  font-size: 0.88rem;
  color: var(--navy);
  line-height: 1.5;
}

.page-about .stage-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 18px;
}
.page-about .stage-list li {
  border-left: 3px solid var(--gold);
  padding-left: 16px;
}
.page-about .stage-list__key {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--ink);
}
.page-about .stage-list p {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.7;
  color: var(--navy);
}

/* ------- 04 服务对象 ------- */
.page-about .audience-stack {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}
.page-about .audience-card {
  padding: 22px 20px;
  border: var(--bw) solid var(--ink);
  background: var(--paper);
  box-shadow: var(--shadow-hard);
  transition: transform var(--t), box-shadow var(--t);
}
.page-about .audience-card:hover {
  transform: translate(-2px, -2px);
  box-shadow: var(--shadow-gold);
}
.page-about .audience-card__tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 5px 10px;
  margin: 0 0 14px;
}
.page-about .audience-card h3 {
  margin: 0 0 10px;
  font-size: 1.14rem;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--ink);
}
.page-about .audience-card p {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.72;
  color: var(--navy);
}
.page-about .audience-card--media {
  border-left-width: 8px;
  border-left-color: var(--gold);
}
.page-about .audience-card--club {
  border-left-width: 8px;
  border-left-color: var(--green);
}
.page-about .audience-card--fan {
  border-left-width: 8px;
  border-left-color: var(--orange);
}
.page-about .audience-card--youth {
  border-left-width: 8px;
  border-left-color: var(--steel);
}

/* ------- 05 合作生态 ------- */
.page-about .partners__figure {
  margin: 0 0 28px;
  border: var(--bw) solid var(--ink);
  box-shadow: var(--shadow-hard);
  background: var(--navy);
}
.page-about .partners__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .partner-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  border-top: var(--bw) solid var(--ink);
}
.page-about .partner-card {
  padding: 22px 0;
  border-bottom: var(--bw) solid var(--line-dark);
}
.page-about .partner-card__num {
  font-family: var(--font-mono);
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--gold);
  line-height: 1;
  margin: 0 0 10px;
}
.page-about .partner-card__title {
  font-size: 1.02rem;
  font-weight: 800;
  margin: 0 0 8px;
  color: var(--ink);
  letter-spacing: -0.01em;
}
.page-about .partner-card p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.7;
  color: var(--navy);
  max-width: 58ch;
}

/* ------- 06 团队与联络 ------- */
.page-about .team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-bottom: 40px;
}
.page-about .team-card {
  padding: 20px;
  border: 2px solid var(--ink);
  background: var(--bone);
  position: relative;
}
.page-about .team-card__key {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.16em;
  color: var(--steel);
  margin: 0 0 10px;
}
.page-about .team-card h3 {
  margin: 0 0 10px;
  font-size: 1.08rem;
  font-weight: 800;
  color: var(--ink);
  letter-spacing: -0.01em;
}
.page-about .team-card p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.7;
  color: var(--navy);
}

.page-about .contact-panel {
  padding: 28px 22px;
  background: var(--navy);
  color: var(--paper);
  border: var(--bw) solid var(--ink);
  box-shadow: var(--shadow-hard);
}
.page-about .contact-panel .eyebrow {
  color: var(--gold);
  margin-bottom: 12px;
}
.page-about .contact-panel__head h3 {
  margin: 0 0 22px;
  font-size: clamp(1.15rem, 2.6vw, 1.5rem);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--paper);
  line-height: 1.35;
}
.page-about .contact-list {
  list-style: none;
  margin: 0 0 20px;
  padding: 0;
}
.page-about .contact-line {
  display: grid;
  grid-template-columns: 1fr;
  gap: 4px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line-light);
}
.page-about .contact-key {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--cool);
}
.page-about .contact-value {
  font-size: 0.98rem;
  color: var(--paper);
  word-break: break-word;
}
.page-about .contact-value.mono {
  font-family: var(--font-mono);
  letter-spacing: 0.01em;
}
.page-about .contact-panel__note {
  margin: 0 0 22px;
  font-size: 0.86rem;
  font-style: italic;
  line-height: 1.7;
  color: var(--cool);
}
.page-about .contact-panel__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
.page-about .contact-panel .btn--ghost {
  color: var(--paper);
  border-color: var(--paper);
}
.page-about .contact-panel .btn--ghost:hover {
  background: var(--paper);
  color: var(--ink);
}

/* ------- 响应式 ------- */
@media (min-width: 760px) {
  .page-about .mission-grid {
    grid-template-columns: 1fr 1fr;
    column-gap: 40px;
  }
  .page-about .mission-block:nth-last-child(-n + 2) {
    border-bottom: 0;
  }
  .page-about .field-matrix {
    grid-template-columns: 1fr 1fr;
  }
  .page-about .audience-stack {
    grid-template-columns: 1fr 1fr;
  }
  .page-about .team-grid {
    grid-template-columns: 1fr 1fr;
  }
  .page-about .team-grid > .team-card:last-child {
    grid-column: 1 / -1;
  }
  .page-about .partner-grid {
    grid-template-columns: 1fr 1fr;
  }
  .page-about .partner-card {
    padding: 26px 28px 26px 0;
    border-bottom: var(--bw) solid var(--line-dark);
    border-right: var(--bw) solid var(--line-dark);
  }
  .page-about .partner-card:nth-child(2n) {
    border-right: 0;
    padding-right: 0;
    padding-left: 28px;
  }
  .page-about .timeline__item--media {
    grid-template-columns: 1fr 1fr;
    align-items: start;
  }
  .page-about .timeline__item--media .media-frame {
    margin-top: -6px;
  }
  .page-about .contact-line {
    grid-template-columns: 160px 1fr;
    gap: 16px;
    align-items: baseline;
  }
}

@media (min-width: 1024px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    gap: 56px;
    align-items: stretch;
    padding-top: 56px;
    padding-bottom: 72px;
  }
  .page-about .about-hero__figure {
    min-height: 520px;
  }
  .page-about .about-shell {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }
  .page-about .index-rail {
    flex-direction: column;
    flex-wrap: nowrap;
    position: sticky;
    top: 88px;
    align-self: start;
    border-bottom: var(--bw) solid var(--line-dark);
    padding-bottom: 20px;
  }
  .page-about .index-rail__link {
    width: 100%;
  }
  .page-about .about-flow {
    gap: 96px;
  }
  .page-about .field-matrix {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .audience-stack {
    grid-template-columns: 1fr 1fr;
    grid-auto-rows: 1fr;
  }
  .page-about .audience-card--fan {
    grid-column: 1 / 2;
  }
  .page-about .audience-card--youth {
    grid-column: 2 / 3;
  }
  .page-about .team-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .team-grid > .team-card:last-child {
    grid-column: auto;
  }
  .page-about .tabpanel {
    padding: 32px;
  }
}

@media (min-width: 1240px) {
  .page-about .about-shell {
    grid-template-columns: 260px minmax(0, 1fr);
    gap: 72px;
  }
  .page-about .partner-grid {
    grid-template-columns: 1fr 1fr;
  }
  .page-about .partner-card--wide {
    grid-column: 1 / -1;
    border-right: 0;
    padding-right: 0;
  }
}
</main>

.page-about {
  --gradient-blue-hint: transparent;
}