.page-about {
  display: block;
}

.page-about .about-shell {
  padding-block: clamp(1.25rem, 3vw, 2rem) clamp(3rem, 6vw, 5rem);
}

/* ===== 面包屑 ===== */
.page-about .breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .45rem;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .06em;
  color: var(--mist);
  margin-bottom: clamp(1.1rem, 3vw, 2rem);
}

.page-about .breadcrumbs a {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

.page-about .breadcrumbs a:hover,
.page-about .breadcrumbs a:focus-visible {
  color: var(--mint);
  border-bottom-color: var(--mint);
  outline: none;
}

.page-about .breadcrumbs span[aria-hidden] {
  color: var(--line-strong);
}

/* ===== 首屏拼贴 ===== */
.page-about .about-hero {
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.5rem);
  padding-bottom: clamp(2rem, 5vw, 3.25rem);
  border-bottom: 1px solid var(--line);
}

.page-about .hero-main .eyebrow {
  margin: 0 0 .6rem;
  letter-spacing: .18em;
  color: var(--mint);
  font-size: .72rem;
}

.page-about .hero-main h1 {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(2.3rem, 8vw, 5rem);
  line-height: .98;
  letter-spacing: -.01em;
  color: var(--paper);
  margin: 0 0 1rem;
}

.page-about .hero-main .lede {
  max-width: 52ch;
  font-size: clamp(.95rem, 1.4vw, 1.06rem);
  line-height: 1.8;
  color: var(--paper);
  margin: 0 0 1.35rem;
}

.page-about .hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: .6rem;
}

.page-about .hero-board {
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  padding: clamp(1rem, 2.5vw, 1.4rem);
  background:
    linear-gradient(158deg, rgba(18, 59, 85, .74), rgba(7, 26, 43, .92));
  backdrop-filter: blur(6px);
}

.page-about .board-title {
  margin: 0 0 .9rem;
  font-size: .7rem;
  letter-spacing: .2em;
  color: var(--amber);
}

.page-about .board-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: .9rem 1rem;
}

.page-about .board-num {
  display: block;
  font-size: clamp(1.5rem, 4vw, 2.1rem);
  font-weight: 500;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--mint);
  font-variant-numeric: tabular-nums;
}

.page-about .board-sm {
  font-size: .5em;
  margin-left: .1em;
  color: var(--mint);
}

.page-about .board-label {
  display: block;
  margin-top: .3rem;
  font-size: .76rem;
  line-height: 1.5;
  color: var(--mist);
}

.page-about .board-note {
  margin: 1.1rem 0 0;
  padding-top: .8rem;
  border-top: 1px dashed var(--line);
  font-size: .76rem;
  line-height: 1.65;
  color: var(--mist);
}

/* ===== 主体：索引 + 内容 ===== */
.page-about .about-body {
  display: grid;
  gap: clamp(1.75rem, 4vw, 3rem);
  padding-top: clamp(2rem, 5vw, 3.25rem);
}

.page-about .about-index {
  border-top: 2px solid var(--mint);
  padding-top: .8rem;
}

.page-about .index-title {
  margin: 0;
  font-size: .68rem;
  letter-spacing: .2em;
  color: var(--mint);
}

.page-about .index-list {
  list-style: none;
  margin: .8rem 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: .4rem;
}

.page-about .index-list a {
  display: flex;
  align-items: baseline;
  gap: .5rem;
  padding: .45rem .55rem;
  border-left: 1px solid var(--line);
  font-size: .84rem;
  line-height: 1.35;
  color: var(--mist);
  text-decoration: none;
  transition: color .2s var(--ease), border-color .2s var(--ease), background .2s var(--ease);
}

.page-about .index-list a .mono {
  font-size: .68rem;
  color: var(--amber);
  letter-spacing: .04em;
}

.page-about .index-list a:hover {
  color: var(--paper);
  border-left-color: var(--mint);
  background: rgba(18, 59, 85, .55);
}

.page-about .index-list a:focus-visible {
  outline: 2px solid var(--mint);
  outline-offset: 2px;
  color: var(--paper);
  border-left-color: var(--mint);
}

/* ===== 章节骨架 ===== */
.page-about .about-section {
  position: relative;
  padding-bottom: clamp(2rem, 5vw, 3rem);
  margin-bottom: clamp(2rem, 5vw, 3rem);
  border-bottom: 1px solid var(--line);
}

.page-about .about-section:last-of-type {
  border-bottom: 0;
  margin-bottom: 0;
  padding-bottom: 0;
}

.page-about .about-section .eyebrow {
  margin: 0 0 .5rem;
  font-size: .68rem;
  letter-spacing: .2em;
  color: var(--mint);
}

.page-about .about-section h2 {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(1.7rem, 4.2vw, 2.9rem);
  line-height: 1.08;
  letter-spacing: -.005em;
  color: var(--paper);
  margin: 0 0 1rem;
  max-width: 22ch;
}

.page-about .about-section p {
  margin: 0 0 .9rem;
  max-width: 64ch;
  font-size: clamp(.92rem, 1.2vw, 1rem);
  line-height: 1.78;
  color: var(--paper);
  opacity: .88;
}

/* ===== 要点列表 ===== */
.page-about .points {
  list-style: none;
  margin: .4rem 0 1rem;
  padding: 0;
  display: grid;
  gap: .55rem;
  max-width: 64ch;
}

.page-about .points li {
  position: relative;
  padding-left: 1.3rem;
  font-size: .9rem;
  line-height: 1.7;
  color: var(--paper);
  opacity: .88;
}

.page-about .points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .62em;
  width: .5rem;
  height: .5rem;
  border-radius: 50%;
  background: var(--mint);
}

/* ===== 图片 ===== */
.page-about .about-figure {
  margin: clamp(1.25rem, 3vw, 1.9rem) 0 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  object-fit: cover;
  filter: saturate(.92) contrast(1.02);
}

.page-about .about-figure .figure__caption {
  margin-top: .55rem;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .02em;
  line-height: 1.6;
  color: var(--mist);
}

/* ===== 赛季时间线 ===== */
.page-about .season-line {
  list-style: none;
  margin: clamp(1.25rem, 3vw, 1.9rem) 0 0;
  padding: 0;
  position: relative;
}

.page-about .season-line::before {
  content: "";
  position: absolute;
  left: .92rem;
  top: .6rem;
  bottom: .6rem;
  width: 1px;
  background: linear-gradient(180deg, var(--mint), var(--amber) 55%, var(--wine));
  opacity: .5;
}

.page-about .season-item {
  position: relative;
  padding-left: 2.9rem;
  padding-bottom: .9rem;
}

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

.page-about .season-no {
  position: absolute;
  left: 0;
  top: .35rem;
  width: 1.85rem;
  height: 1.85rem;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--navy);
  border: 1px solid var(--mint);
  color: var(--mint);
  font-size: .72rem;
  letter-spacing: 0;
  font-variant-numeric: tabular-nums;
  z-index: 1;
}

.page-about .season-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(11, 39, 64, .55);
  transition: border-color .22s var(--ease), background .22s var(--ease), transform .22s var(--ease);
}

.page-about .season-card:hover {
  border-color: var(--line-strong);
  background: rgba(18, 59, 85, .7);
  transform: translateX(2px);
}

.page-about .season-card summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  padding: .8rem .95rem;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(.98rem, 1.6vw, 1.1rem);
  line-height: 1.35;
  color: var(--paper);
}

.page-about .season-card summary::-webkit-details-marker {
  display: none;
}

.page-about .season-card summary::after {
  content: "＋";
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: .78rem;
  color: var(--amber);
}

.page-about .season-card[open] summary::after {
  content: "－";
}

.page-about .season-card summary:focus-visible {
  outline: 2px solid var(--mint);
  outline-offset: -2px;
  border-radius: var(--radius);
}

.page-about .season-card p {
  margin: 0;
  padding: 0 .95rem 1rem;
  font-size: .88rem;
  line-height: 1.72;
  color: var(--mist);
  opacity: 1;
  max-width: 68ch;
}

.page-about .season-card[open] summary {
  border-bottom: 1px solid var(--line);
  margin-bottom: .7rem;
}

/* ===== 团队 ===== */
.page-about .team-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: .7rem;
  margin: 1rem 0 1.35rem;
}

.page-about .team-stat {
  padding: .9rem 1rem;
  border: 1px solid var(--line);
  border-top: 2px solid var(--indigo);
  border-radius: var(--radius);
  background: rgba(18, 59, 85, .35);
}

.page-about .team-stat .mono {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.6rem, 4.5vw, 2.4rem);
  font-weight: 500;
  line-height: 1;
  color: var(--paper);
  font-variant-numeric: tabular-nums;
}

.page-about .team-stat p {
  margin: .45rem 0 0;
  font-size: .8rem;
  line-height: 1.6;
  color: var(--mist);
  opacity: 1;
  max-width: none;
}

.page-about .flow {
  list-style: none;
  margin: 1.25rem 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: .65rem;
}

.page-about .flow-step {
  position: relative;
  padding: .95rem 1rem 1.05rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(172deg, rgba(18, 59, 85, .52), rgba(7, 26, 43, .62));
  transition: transform .25s var(--ease), border-color .25s var(--ease), box-shadow .25s var(--ease);
}

.page-about .flow-step:hover {
  transform: translateY(-3px);
  border-color: var(--mint);
  box-shadow: 0 10px 24px rgba(0, 0, 0, .28);
}

.page-about .flow-step:focus-visible {
  transform: translateY(-3px);
  border-color: var(--mint);
  outline: 2px solid var(--mint);
  outline-offset: 3px;
}

.page-about .flow-num {
  display: block;
  font-size: .66rem;
  letter-spacing: .14em;
  color: var(--mint);
}

.page-about .flow-step h3 {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: .01em;
  color: var(--paper);
  margin: .35rem 0 .4rem;
}

.page-about .flow-step p {
  margin: 0;
  font-size: .82rem;
  line-height: 1.68;
  color: var(--mist);
  opacity: 1;
  max-width: none;
}

.page-about .note-glass {
  margin: 1.35rem 0 0;
  padding: 1rem 1.1rem;
  border: 1px solid var(--line-strong);
  border-left: 3px solid var(--amber);
  border-radius: var(--radius);
  background: linear-gradient(140deg, rgba(18, 59, 85, .62), rgba(7, 26, 43, .9));
  backdrop-filter: blur(5px);
}

.page-about .note-glass .mono {
  display: block;
  margin-bottom: .45rem;
  font-size: .68rem;
  letter-spacing: .18em;
  color: var(--amber);
}

.page-about .note-glass p {
  margin: 0;
  font-size: .88rem;
  line-height: 1.75;
  color: var(--paper);
  opacity: .92;
  max-width: 64ch;
}

/* ===== 内容体系 ===== */
.page-about .league-grid {
  list-style: none;
  margin: 1rem 0 1.35rem;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: .6rem;
}

.page-about .league-item {
  padding: .85rem .95rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(11, 39, 64, .55);
  transition: border-color .2s var(--ease), background .2s var(--ease);
}

.page-about .league-item:hover {
  border-color: var(--mint);
  background: rgba(18, 59, 85, .72);
}

.page-about .league-item h3 {
  display: flex;
  align-items: baseline;
  gap: .5rem;
  margin: 0 0 .3rem;
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--paper);
}

.page-about .league-item h3 .mono {
  font-size: .66rem;
  font-weight: 400;
  letter-spacing: .1em;
  color: var(--mint);
}

.page-about .league-item p {
  margin: 0;
  font-size: .82rem;
  line-height: 1.65;
  color: var(--mist);
  opacity: 1;
  max-width: none;
}

.page-about .facts {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .facts li {
  display: flex;
  gap: .85rem;
  padding: .78rem 0;
  border-bottom: 1px solid var(--line);
  font-size: .88rem;
  line-height: 1.7;
  color: var(--paper);
  opacity: .88;
}

.page-about .facts li .mono {
  flex: 0 0 auto;
  padding-top: .15rem;
  font-size: .7rem;
  letter-spacing: .1em;
  color: var(--amber);
}

/* ===== 合作生态 ===== */
.page-about .partner-grid {
  list-style: none;
  margin: 1rem 0 1.4rem;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: .7rem;
}

.page-about .partner-item {
  padding: .9rem 1rem;
  border-left: 2px solid var(--wine);
  border-radius: 0 var(--radius) var(--radius) 0;
  background: linear-gradient(100deg, rgba(110, 42, 79, .3), rgba(11, 39, 64, .55));
}

.page-about .partner-item:nth-child(2) {
  border-left-color: var(--indigo);
  background: linear-gradient(100deg, rgba(75, 58, 143, .3), rgba(11, 39, 64, .55));
}

.page-about .partner-item:nth-child(3) {
  border-left-color: var(--mint);
  background: linear-gradient(100deg, rgba(45, 242, 196, .16), rgba(11, 39, 64, .55));
}

.page-about .partner-item:nth-child(4) {
  border-left-color: var(--amber);
  background: linear-gradient(100deg, rgba(255, 178, 74, .18), rgba(11, 39, 64, .55));
}

.page-about .partner-item h3 {
  margin: 0 0 .3rem;
  font-family: var(--font-display);
  font-size: 1.02rem;
  font-weight: 600;
  color: var(--paper);
}

.page-about .partner-item p {
  margin: 0;
  font-size: .82rem;
  line-height: 1.65;
  color: var(--mist);
  opacity: 1;
  max-width: none;
}

.page-about .partner-lead {
  margin: 0 0 .6rem;
  font-size: .68rem;
  letter-spacing: .2em;
  color: var(--mint);
}

.page-about .partner-flow {
  list-style: none;
  margin: 0 0 1.2rem;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: .45rem;
}

.page-about .partner-flow li {
  padding: .38rem .8rem;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: rgba(18, 59, 85, .5);
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .05em;
  color: var(--paper);
  white-space: nowrap;
}

.page-about .partner-contact {
  margin-bottom: 1.1rem;
  font-size: .9rem;
  line-height: 1.75;
  color: var(--paper);
  opacity: .9;
  max-width: 62ch;
}

/* ===== 下一步 ===== */
.page-about .next-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: .7rem;
  margin-top: 1rem;
}

.page-about .next-card {
  display: block;
  padding: 1rem 1.05rem 1.15rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(11, 39, 64, .6);
  text-decoration: none;
  transition: transform .24s var(--ease), border-color .24s var(--ease), background .24s var(--ease);
}

.page-about .next-card .mono {
  display: block;
  font-size: .68rem;
  letter-spacing: .16em;
  color: var(--amber);
}

.page-about .next-card h3 {
  margin: .45rem 0 .45rem;
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--paper);
}

.page-about .next-card p {
  margin: 0;
  font-size: .84rem;
  line-height: 1.68;
  color: var(--mist);
  opacity: 1;
  max-width: none;
}

.page-about .next-card:hover {
  transform: translateY(-3px);
  border-color: var(--mint);
  background: rgba(18, 59, 85, .78);
}

.page-about .next-card:focus-visible {
  outline: 2px solid var(--mint);
  outline-offset: 3px;
  transform: translateY(-3px);
  border-color: var(--mint);
}

/* ===== 响应式 ===== */
@media (min-width: 640px) {
  .page-about .league-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

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

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

@media (min-width: 780px) {
  .page-about .flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: .55rem;
  }

  .page-about .flow-step:not(:last-child)::after {
    content: "";
    position: absolute;
    top: 50%;
    right: -.55rem;
    width: .55rem;
    height: 1px;
    background: var(--line-strong);
    transform: translateY(-50%);
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.4fr) minmax(270px, .6fr);
    align-items: end;
  }

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

@media (min-width: 1024px) {
  .page-about .about-body {
    grid-template-columns: 14.5rem minmax(0, 1fr);
    gap: clamp(2rem, 4vw, 3.5rem);
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: 5.5rem;
  }

  .page-about .index-list {
    grid-template-columns: 1fr;
    gap: .25rem;
  }

  .page-about .about-section {
    padding-left: 1.6rem;
  }

  .page-about .about-section::before {
    content: "";
    position: absolute;
    left: 0;
    top: .55rem;
    width: 2px;
    height: 2.1rem;
    background: var(--mint);
  }

  .page-about .about-section--timeline::before {
    background: var(--amber);
  }

  .page-about .about-section--team::before {
    background: var(--indigo);
  }

  .page-about .about-section--partners::before {
    background: var(--wine);
  }

  .page-about .about-section p,
  .page-about .points {
    max-width: 60ch;
  }
}

@media (min-width: 1200px) {
  .page-about .league-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .season-card,
  .page-about .flow-step,
  .page-about .next-card,
  .page-about .league-item,
  .page-about .index-list a {
    transition: none;
  }

  .page-about .season-card:hover,
  .page-about .flow-step:hover,
  .page-about .flow-step:focus-visible,
  .page-about .next-card:hover,
  .page-about .next-card:focus-visible {
    transform: none;
  }
}
<<<END>>>