.page-about{
  --about-measure: 40rem;
  --about-drift: 0px;
  padding-bottom: clamp(40px, 7vw, 110px);
}
@media (min-width: 1024px){
  .page-about{ --about-drift: clamp(24px, 5vw, 84px); }
}

/* ---------- 页首 ---------- */
.page-about .about-head{
  padding-block: clamp(20px, 4vw, 40px) clamp(26px, 4vw, 48px);
}
.page-about .page-head__eyebrow{
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .28em;
  color: var(--copper);
}
.page-about .page-head__title{
  margin: .55rem 0 0;
  font-size: clamp(32px, 7.4vw, 74px);
  line-height: 1.04;
  letter-spacing: -.025em;
  font-weight: 900;
  color: var(--bone);
  max-width: 15ch;
}
.page-about .page-head__lead{
  margin: clamp(16px, 2.4vw, 26px) 0 0;
  max-width: 44rem;
  font-size: 1.02rem;
  line-height: 1.85;
  color: rgba(243, 238, 227, .82);
}

.page-about .about-head__stats{
  list-style: none;
  margin: clamp(24px, 4vw, 40px) 0 0;
  padding: 1px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 1px;
  background: var(--ember);
  border: 1px solid var(--ember);
}
.page-about .about-head__stats .stat{
  background: var(--ink);
  padding: 18px 16px 16px;
}
.page-about .about-head__stats .stat__value{
  display: inline;
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.4vw, 38px);
  line-height: 1;
  color: var(--copper);
}
.page-about .about-head__stats .stat__unit{
  display: inline;
  margin-left: 5px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--mist);
}
.page-about .about-head__stats .stat__label{
  display: block;
  margin-top: 10px;
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--mist);
}

/* ---------- 开篇横幅 ---------- */
.page-about .about-banner{
  margin: 0 0 clamp(30px, 5vw, 64px);
}
.page-about .about-banner img{
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border: 1px solid var(--ember);
  filter: saturate(.9) contrast(1.08) brightness(.88);
}
.page-about .about-banner .media__cap{
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.7;
  letter-spacing: .06em;
  color: var(--mist);
}

/* ---------- 外壳：时间轴 + 正文 ---------- */
.page-about .about-shell{ display: block; }
@media (min-width: 1024px){
  .page-about .about-shell{
    display: grid;
    grid-template-columns: 152px minmax(0, 1fr);
    gap: clamp(28px, 4vw, 72px);
    align-items: start;
  }
}

.page-about .about-rail{
  min-width: 0;
  margin-bottom: clamp(26px, 4vw, 44px);
  border-top: 1px solid var(--ember);
  border-bottom: 1px solid var(--ember);
  padding-block: 12px;
}
@media (min-width: 1024px){
  .page-about .about-rail{
    position: sticky;
    top: calc(var(--topbar-h) + 28px);
    margin-bottom: 0;
    border: 0;
    padding-block: 0;
  }
}
.page-about .about-rail__title{
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .3em;
  color: var(--mist);
}
.page-about .about-rail__list{
  list-style: none;
  margin: 0;
  padding: 0 0 4px;
  display: flex;
  gap: 18px;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}
.page-about .about-rail__list::-webkit-scrollbar{ display: none; }
@media (min-width: 1024px){
  .page-about .about-rail__list{
    flex-direction: column;
    gap: 0;
    padding: 0 0 0 16px;
    overflow: visible;
    position: relative;
  }
  .page-about .about-rail__list::before{
    content: "";
    position: absolute;
    left: 4px;
    top: 12px;
    bottom: 12px;
    width: 1px;
    background: linear-gradient(180deg, var(--copper) 0%, var(--ember) 62%, rgba(58, 66, 82, 0) 100%);
  }
}
.page-about .about-node{
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 0;
  text-decoration: none;
  color: var(--mist);
  white-space: nowrap;
  transition: color .25s var(--ease);
}
.page-about .about-node__dot{
  width: 8px;
  height: 8px;
  flex: none;
  border-radius: 50%;
  border: 1px solid var(--copper);
  transform: translateY(-1px);
  transition: background .3s var(--ease), box-shadow .3s var(--ease);
}
.page-about .about-node__season{
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
}
.page-about .about-node__label{
  font-size: 12px;
  letter-spacing: .16em;
}
.page-about .about-node:hover,
.page-about .about-node:focus-visible{ color: var(--bone); }
.page-about .about-node.is-current{ color: var(--bone); }
.page-about .about-node.is-current .about-node__dot{
  background: var(--copper);
  box-shadow: 0 0 0 4px rgba(201, 154, 70, .18);
}

/* ---------- 章节通用 ---------- */
.page-about .about-flow{ min-width: 0; }
.page-about .about-block{
  max-width: var(--about-measure);
  margin: 0 0 clamp(48px, 8vw, 112px);
}
@media (min-width: 1024px){
  .page-about .about-block--drift{ margin-left: var(--about-drift); }
}
.page-about .section__num{
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .3em;
  color: var(--flame);
}
.page-about .about-block__title{
  font-size: clamp(23px, 3.4vw, 36px);
  line-height: 1.28;
  letter-spacing: -.02em;
  font-weight: 800;
  color: var(--bone);
  max-width: 22ch;
}
.page-about .about-copy{
  margin: 1rem 0 0;
  max-width: 38em;
  font-size: 16px;
  line-height: 1.85;
  color: rgba(243, 238, 227, .8);
}
.page-about .about-copy a{
  color: var(--copper);
  text-underline-offset: 4px;
}
.page-about .about-copy em{
  font-style: normal;
  font-family: var(--font-mono);
  color: var(--copper);
}

/* ---------- 赛季条目 ---------- */
.page-about .season-strip{
  list-style: none;
  margin: clamp(24px, 4vw, 40px) 0 0;
  padding: 1px;
  display: grid;
  gap: 1px;
  background: var(--ember);
  border: 1px solid var(--ember);
}
@media (min-width: 640px){
  .page-about .season-strip{ grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (min-width: 1180px){
  .page-about .season-strip{ grid-template-columns: repeat(3, minmax(0, 1fr)); }
}
.page-about .season-strip__item{
  background: var(--ink-2);
  padding: 16px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 8px;
}
.page-about .season-strip__year{
  font-family: var(--font-mono);
  font-size: 22px;
  line-height: 1;
  color: var(--copper);
  letter-spacing: .02em;
}
.page-about .season-strip__desc{
  margin: 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 三组变量色带 ---------- */
.page-about .band-chart{
  margin: clamp(24px, 4vw, 40px) 0 0;
  padding: 1px;
  display: grid;
  gap: 1px;
  background: var(--ember);
  border: 1px solid var(--ember);
}
.page-about .band-row{
  background: var(--ink-2);
  padding: 16px;
  display: grid;
  gap: 10px;
}
@media (min-width: 768px){
  .page-about .band-row{
    grid-template-columns: 132px minmax(0, 1fr) 168px;
    align-items: center;
    gap: 8px 18px;
  }
  .page-about .band-row__note{ grid-column: 1 / -1; }
}
.page-about .band-row__label{
  margin: 0;
  font-size: 14px;
  letter-spacing: .04em;
  color: var(--bone);
}
.page-about .band-row__track{
  position: relative;
  height: 10px;
  border-radius: 2px;
  background: rgba(127, 144, 168, .14);
  overflow: hidden;
}
.page-about .band-row__fill{
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  border-radius: 2px;
}
.page-about .band-row__fill--a{
  width: 62%;
  background: linear-gradient(90deg, var(--flame), var(--copper));
}
.page-about .band-row__fill--b{
  width: 78%;
  background: linear-gradient(90deg, var(--jade), rgba(47, 163, 122, .45));
}
.page-about .band-row__fill--c{
  width: 45%;
  background: linear-gradient(90deg, var(--mist), rgba(127, 144, 168, .4));
}
.page-about .band-row__value{
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .02em;
  color: var(--copper);
}
.page-about .band-row__note{
  margin: 0;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--mist);
}
@media (hover: hover) and (min-width: 768px){
  .page-about .band-row__note{
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    transition: max-height .35s var(--ease), opacity .3s var(--ease);
  }
  .page-about .band-row:hover .band-row__note,
  .page-about .band-row:focus-within .band-row__note{
    max-height: 6rem;
    opacity: 1;
  }
}

/* ---------- 小组分工 ---------- */
.page-about .team-panel{
  margin-top: clamp(24px, 4vw, 40px);
  display: grid;
  gap: clamp(22px, 3vw, 36px);
}
@media (min-width: 768px){
  .page-about .team-panel{
    grid-template-columns: 210px minmax(0, 1fr);
    align-items: center;
  }
}
.page-about .team-ring__disc{
  width: 200px;
  max-width: 100%;
  aspect-ratio: 1 / 1;
  margin: 0 auto;
  border-radius: 50%;
  display: grid;
  place-items: center;
  position: relative;
  background: conic-gradient(
    var(--flame) 0 33%,
    var(--jade) 33% 55.5%,
    var(--copper) 55.5% 78%,
    var(--mist) 78% 100%
  );
  box-shadow: 0 0 0 1px var(--ember);
}
.page-about .team-ring__disc::after{
  content: "";
  position: absolute;
  inset: 30%;
  border-radius: 50%;
  background: var(--ink);
}
.page-about .team-ring__center{
  position: relative;
  z-index: 1;
  font-family: var(--font-mono);
  font-size: 34px;
  line-height: 1;
  color: var(--bone);
  text-align: center;
}
.page-about .team-ring__center small{
  display: block;
  margin-top: 6px;
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--mist);
}
.page-about .team-legend{
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}
.page-about .team-legend__item{
  display: grid;
  grid-template-columns: 12px minmax(0, 1fr);
  gap: 10px;
}
.page-about .team-legend__swatch{
  width: 10px;
  height: 10px;
  margin-top: 5px;
  border-radius: 2px;
}
.page-about .team-legend__swatch--a{ background: var(--flame); }
.page-about .team-legend__swatch--b{ background: var(--jade); }
.page-about .team-legend__swatch--c{ background: var(--copper); }
.page-about .team-legend__swatch--d{ background: var(--mist); }
.page-about .team-legend__name{
  font-size: 14px;
  color: var(--bone);
}
.page-about .team-legend__count{
  margin-left: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--copper);
}
.page-about .team-legend__desc{
  margin: 4px 0 0;
  font-size: 13px;
  line-height: 1.72;
  color: var(--mist);
}

/* ---------- 核定流程 ---------- */
.page-about .flow-steps{
  list-style: none;
  margin: clamp(24px, 4vw, 40px) 0 0;
  padding: 1px;
  display: grid;
  gap: 1px;
  background: var(--ember);
  border: 1px solid var(--ember);
}
@media (min-width: 640px){
  .page-about .flow-steps{ grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (min-width: 1180px){
  .page-about .flow-steps{ grid-template-columns: repeat(3, minmax(0, 1fr)); }
}
.page-about .flow-steps__item{
  background: var(--ink-2);
  padding: 16px;
}
.page-about .flow-steps__num{
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .24em;
  color: var(--flame);
}
.page-about .flow-steps__text{
  margin: 8px 0 0;
  font-size: 14px;
  letter-spacing: .04em;
  color: var(--bone);
}
.page-about .flow-steps__meta{
  margin: 6px 0 0;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 配图 ---------- */
.page-about .about-media{
  margin: clamp(24px, 4vw, 40px) 0 0;
}
.page-about .about-media img{
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border: 1px solid var(--ember);
  filter: saturate(.86) contrast(1.1) brightness(.9);
}
.page-about .about-media--wide img{ aspect-ratio: 14 / 9; }
.page-about .about-media .media__cap{
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.7;
  letter-spacing: .06em;
  color: var(--mist);
}

/* ---------- 版本叠层 ---------- */
.page-about .paper-stack{
  margin-top: clamp(24px, 4vw, 40px);
  display: grid;
  gap: 12px;
}
.page-about .paper-card{
  background: var(--ink-2);
  border: 1px solid var(--ember);
  border-left: 3px solid var(--copper);
  box-shadow: 6px 6px 0 rgba(58, 66, 82, .55);
}
@media (min-width: 768px){
  .page-about .paper-card:nth-child(2){ margin-left: 12px; }
  .page-about .paper-card:nth-child(3){ margin-left: 24px; }
  .page-about .paper-card:nth-child(4){ margin-left: 36px; }
}
.page-about .paper-card__sum{
  list-style: none;
  cursor: pointer;
  padding: 14px 16px;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 4px 12px;
  align-items: baseline;
}
.page-about .paper-card__sum::-webkit-details-marker{ display: none; }
.page-about .paper-card__ver{
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--copper);
}
.page-about .paper-card__year{
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--mist);
}
.page-about .paper-card__hint{
  grid-column: 1 / -1;
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--flame);
}
.page-about .paper-card__hint::before{ content: "＋ "; }
.page-about .paper-card[open] .paper-card__hint{ color: var(--jade); }
.page-about .paper-card[open] .paper-card__hint::before{ content: "－ "; }
.page-about .paper-card__body{ padding: 0 16px 16px; }
.page-about .paper-card__list{
  margin: 0;
  padding-left: 1.1em;
}
.page-about .paper-card__list li{
  margin-bottom: 6px;
  font-size: 13.5px;
  line-height: 1.8;
  color: rgba(243, 238, 227, .8);
}
.page-about .paper-card__list li:last-child{ margin-bottom: 0; }

/* ---------- 合作生态 ---------- */
.page-about .partner-panel{
  margin-top: clamp(24px, 4vw, 40px);
  padding: 1px;
  display: grid;
  gap: 1px;
  background: var(--ember);
  border: 1px solid var(--ember);
}
@media (min-width: 768px){
  .page-about .partner-panel{ grid-template-columns: repeat(3, minmax(0, 1fr)); }
}
.page-about .partner-panel__item{
  background: var(--ink-2);
  padding: 18px 16px;
}
.page-about .partner-panel__name{
  margin: 0 0 8px;
  font-size: 14px;
  letter-spacing: .04em;
  color: var(--bone);
}
.page-about .partner-panel__desc{
  margin: 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 收尾 ---------- */
.page-about .about-cta{
  max-width: var(--about-measure);
  border-top: 1px solid var(--ember);
  padding-top: clamp(24px, 4vw, 40px);
}
.page-about .about-cta__title{
  margin: 0;
  font-size: clamp(20px, 2.6vw, 28px);
  line-height: 1.32;
  letter-spacing: -.015em;
  color: var(--bone);
}
.page-about .about-cta__actions{
  margin-top: clamp(18px, 2.6vw, 26px);
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 窄屏兜底 ---------- */
@media (max-width: 639px){
  .page-about .about-head__stats{ grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .page-about .team-ring__disc{ width: 168px; }
  .page-about .band-row__value{ font-size: 12px; }
  .page-about .about-cta__actions .btn{ flex: 1 1 auto; text-align: center; }
}
<<<END>>>