.page-about {
  --about-rail-w: 118px;
  --about-rhythm: clamp(2.5rem, 6vw, 5rem);
  background: var(--carbon);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(1rem, 2.5vw, 1.75rem) 0 clamp(3rem, 7vw, 5.5rem);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(247, 249, 255, .045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(247, 249, 255, .045) 1px, transparent 1px);
  background-size: 46px 46px;
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(53, 242, 214, .5), transparent);
}

.page-about .about-hero .crumbs {
  position: relative;
  z-index: 1;
  margin-bottom: clamp(1.5rem, 4vw, 2.5rem);
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(2rem, 5vw, 3.5rem);
  align-items: center;
}

.page-about .about-hero__kicker {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 0 0 1.25rem;
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-size: clamp(1.85rem, 5vw, 3.1rem);
  font-weight: 700;
  line-height: 1.16;
  letter-spacing: -0.012em;
  color: var(--edge);
  margin: 0 0 1.15rem;
  max-width: 15em;
}

.page-about .about-hero__lead {
  color: var(--grey);
  font-size: 1.0625rem;
  line-height: 1.85;
  max-width: var(--measure);
  margin: 0 0 2rem;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.page-about .about-hero__visual svg {
  display: block;
  width: 100%;
  height: auto;
}

/* ---------- 主壳层 ---------- */
.page-about .about-shell {
  padding: var(--about-rhythm) 0;
  background: var(--carbon);
}

.page-about .about-shell__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(2rem, 4vw, 3rem);
}

/* ---------- 左栏刻度 ---------- */
.page-about .about-rail {
  display: none;
}

.page-about .about-rail__title {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--grey);
  margin: 0 0 1.1rem;
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.95rem;
}

.page-about .about-rail__link {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  font-size: 0.8125rem;
  line-height: 1.45;
  color: var(--grey);
  text-decoration: none;
  transition: color .18s ease;
}

.page-about .about-rail__num {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--orange);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link[aria-current="true"] {
  color: var(--cyan);
}

/* ---------- 章节底板 ---------- */
.page-about .about-sec {
  padding: clamp(1.65rem, 4vw, 3.25rem);
  border-radius: var(--r);
  margin-bottom: clamp(1.25rem, 3vw, 2.25rem);
}

.page-about .about-sec:last-child {
  margin-bottom: 0;
}

.page-about .about-sec--dark {
  background: var(--midnight);
  border: 1px solid var(--line-dark);
}

.page-about .about-sec--paper {
  background: var(--cream);
  color: var(--ink);
  border: 1px solid var(--line-light);
}

.page-about .sec-head {
  margin-bottom: clamp(1.5rem, 3vw, 2.25rem);
}

.page-about .sec-head__title {
  font-family: var(--font-display);
  font-size: clamp(1.35rem, 3.1vw, 1.95rem);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.005em;
  margin: 0.35rem 0 0.65rem;
}

.page-about .about-sec--dark .sec-head__title {
  color: var(--edge);
}

.page-about .about-sec--paper .sec-head__title {
  color: var(--ink);
}

.page-about .sec-head__sub {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  max-width: var(--measure);
}

.page-about .about-sec--dark .sec-head__sub {
  color: var(--grey);
}

.page-about .about-sec--paper .sec-head__sub {
  color: rgba(42, 31, 23, .7);
}

.page-about .about-sec--paper .tag--dim {
  color: var(--ink);
  border-color: rgba(42, 31, 23, .3);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  position: relative;
  display: grid;
  gap: clamp(1rem, 2.2vw, 1.5rem);
  padding-left: 1.35rem;
  margin-bottom: clamp(1.75rem, 3.5vw, 2.75rem);
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: var(--line-dark);
}

.page-about .tl-node {
  position: relative;
}

.page-about .tl-node__dot {
  position: absolute;
  left: -1.35rem;
  top: 0.45em;
  width: 9px;
  height: 9px;
  background: var(--cyan);
  box-shadow: 0 0 0 3px rgba(53, 242, 214, .14);
}

.page-about .tl-node__year {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.09em;
  color: var(--orange);
  margin-bottom: 0.35rem;
}

.page-about .tl-node__title {
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--edge);
  margin: 0 0 0.4rem;
  line-height: 1.4;
}

.page-about .tl-node__text {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--grey);
  max-width: var(--measure);
}

/* ---------- 团队 ---------- */
.page-about .about-team__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.5rem, 3vw, 2.25rem);
  align-items: start;
}

.page-about .about-team__cards {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.85rem;
}

.page-about .team-card {
  position: relative;
  padding: 1.1rem 1.15rem;
  background: rgba(255, 255, 255, .5);
  border: 1px solid var(--line-light);
  border-radius: var(--r);
  transition: border-color .2s ease, transform .2s ease, box-shadow .2s ease;
}

.page-about .team-card::after {
  content: "";
  position: absolute;
  top: -1px;
  right: -1px;
  width: 12px;
  height: 12px;
  border-top: 1px solid var(--orange);
  border-right: 1px solid var(--orange);
}

.page-about .team-card:hover,
.page-about .team-card:focus-within {
  border-color: var(--orange);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

.page-about .team-card__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.6rem;
  font-weight: 600;
  line-height: 1;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}

.page-about .team-card__name {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--ink);
  margin: 0.6rem 0 0.4rem;
}

.page-about .team-card__desc {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.78;
  color: rgba(42, 31, 23, .74);
}

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

.page-about .about-rhythm {
  margin: clamp(1.75rem, 3vw, 2.25rem) 0 0;
  padding: 0.8rem 1rem;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.03em;
  line-height: 1.7;
  color: var(--ink);
  background: var(--paper);
  border-left: 3px solid var(--orange);
  border-radius: 0 var(--r) var(--r) 0;
}

/* ---------- 球队简史 ---------- */
.page-about .about-club-table {
  border: 1px solid var(--line-dark);
  border-radius: var(--r);
}

.page-about .about-club-table .data {
  width: 100%;
  border-collapse: collapse;
}

.page-about .about-club-table .data th,
.page-about .about-club-table .data td {
  text-align: left;
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--line-dark);
  font-size: 0.9rem;
  line-height: 1.7;
  vertical-align: top;
}

.page-about .about-club-table .data th {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--grey);
  white-space: nowrap;
}

.page-about .about-club-table .data td {
  color: var(--edge);
}

.page-about .about-club-table .data td:first-child {
  font-family: var(--font-mono);
  color: var(--cyan);
  white-space: nowrap;
  font-size: 0.85rem;
}

.page-about .about-club-table .data tbody tr:last-child td {
  border-bottom: 0;
}

.page-about .about-club-table .data tbody tr:hover td {
  background: rgba(53, 242, 214, .055);
}

.page-about .about-note {
  margin: clamp(1.25rem, 2.5vw, 1.75rem) 0 0;
  padding-left: 1rem;
  border-left: 1px solid var(--cyan);
  font-size: 0.9rem;
  line-height: 1.8;
  max-width: var(--measure);
}

.page-about .about-sec--dark .about-note {
  color: var(--grey);
}

.page-about .about-sec--paper .about-note {
  color: rgba(42, 31, 23, .72);
}

/* ---------- 友谊赛 ---------- */
.page-about .friend-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.9rem;
}

.page-about .friend-card {
  padding: 1.15rem 1.2rem;
  background: rgba(255, 255, 255, .5);
  border: 1px solid var(--line-light);
  border-radius: var(--r);
  transition: border-color .2s ease, transform .2s ease;
}

.page-about .friend-card:hover {
  border-color: var(--orange);
  transform: translateY(-2px);
}

.page-about .friend-card__title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--ink);
  margin: 0.7rem 0 0.5rem;
  line-height: 1.4;
}

.page-about .friend-card__text {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.8;
  color: rgba(42, 31, 23, .76);
}

.page-about .friend-card__note {
  margin: 0.85rem 0 0;
  padding-top: 0.7rem;
  border-top: 1px dashed var(--line-light);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.03em;
  color: rgba(42, 31, 23, .58);
}

/* ---------- 合作 ---------- */
.page-about .partner-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.9rem;
}

.page-about .partner-badge {
  padding: 1.15rem 1.2rem;
  border: 1px solid var(--line-dark);
  border-radius: var(--r);
  background: rgba(11, 18, 32, .5);
  transition: border-color .2s ease, transform .2s ease;
}

.page-about .partner-badge:hover,
.page-about .partner-badge:focus-within {
  border-color: var(--cyan);
  transform: translateY(-2px);
}

.page-about .partner-badge__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(2rem, 5vw, 2.75rem);
  font-weight: 600;
  line-height: 1;
  color: var(--orange);
  font-variant-numeric: tabular-nums;
}

.page-about .partner-badge__label {
  display: block;
  margin-top: 0.5rem;
  font-size: 0.9rem;
  color: var(--edge);
  line-height: 1.5;
}

.page-about .partner-badge__note {
  display: block;
  margin-top: 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  line-height: 1.6;
  color: var(--grey);
  opacity: .6;
  transition: opacity .2s ease, color .2s ease;
}

.page-about .partner-badge:hover .partner-badge__note,
.page-about .partner-badge:focus-within .partner-badge__note {
  opacity: 1;
  color: var(--cyan);
}

/* ---------- 使用场景 ---------- */
.page-about .user-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.9rem;
}

.page-about .user-card {
  padding: 1.15rem 1.2rem;
  border: 1px solid var(--line-light);
  border-left: 3px solid var(--orange);
  border-radius: 0 var(--r) var(--r) 0;
  background: rgba(255, 255, 255, .46);
}

.page-about .user-card__title {
  margin: 0 0 0.5rem;
  font-size: 1rem;
  font-weight: 600;
  color: var(--ink);
  line-height: 1.4;
}

.page-about .user-card__text {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.8;
  color: rgba(42, 31, 23, .76);
}

.page-about .about-users__figure {
  margin: clamp(1.75rem, 3.5vw, 2.5rem) 0 0;
}

/* ---------- 原则 ---------- */
.page-about .principle-list {
  list-style: none;
  margin: 0 0 clamp(1.75rem, 3.5vw, 2.5rem);
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1rem;
}

.page-about .principle {
  padding: 1.1rem 0 1.1rem 1.15rem;
  border-left: 1px solid var(--line-dark);
}

.page-about .principle__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  color: var(--orange);
  margin-bottom: 0.55rem;
}

.page-about .principle__title {
  margin: 0 0 0.45rem;
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--edge);
  line-height: 1.4;
}

.page-about .principle__text {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--grey);
  max-width: var(--measure);
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.25rem;
  padding-top: clamp(1.5rem, 3vw, 2rem);
  border-top: 1px solid var(--line-dark);
}

.page-about .about-cta__text {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--grey);
  max-width: var(--measure);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

/* ---------- 图片容器 ---------- */
.page-about .figure__frame {
  overflow: hidden;
  border: 1px solid var(--line-light);
  border-radius: var(--r);
  background: rgba(11, 18, 32, .4);
}

.page-about .about-sec--dark .figure__frame {
  border-color: var(--line-dark);
}

.page-about .figure__frame img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(.82) contrast(1.04);
}

.page-about .figure__caption {
  margin-top: 0.7rem;
  font-size: 0.8125rem;
  line-height: 1.7;
  color: var(--grey);
}

.page-about .about-sec--paper .figure__caption {
  color: rgba(42, 31, 23, .62);
}

/* ---------- 平板 ---------- */
@media (min-width: 620px) {
  .page-about .about-team__cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

/* ---------- 桌面 ---------- */
@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: 5fr 6fr;
  }

  .page-about .about-hero h1 {
    max-width: 13em;
  }
}

@media (min-width: 940px) {
  .page-about .about-shell__grid {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: clamp(1.75rem, 3.5vw, 3rem);
    align-items: start;
  }

  .page-about .about-rail {
    display: block;
    position: sticky;
    top: var(--sticky-top);
    padding: 0.35rem 0 0 0.9rem;
    border-left: 1px solid var(--line-dark);
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
  }

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

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

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

  .page-about .principle-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.5rem;
  }

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 2rem;
  }
}

/* ---------- 动效偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .team-card,
  .page-about .friend-card,
  .page-about .partner-badge {
    transition: none;
  }

  .page-about .team-card:hover,
  .page-about .friend-card:hover,
  .page-about .partner-badge:hover {
    transform: none;
  }
}