.page-about{
  --about-paper-ink:#101720;
  --about-gap:clamp(56px,9vh,124px);
  --about-spine:84px;
}

.page-about .about-board{
  position:relative;
  display:grid;
  grid-template-columns:minmax(0,1fr);
}

.page-about .about-spine{ display:none; }

.page-about .about-main{
  min-width:0;
  border-left:1px solid var(--line);
  padding-left:18px;
}

@media (min-width:1024px){
  .page-about .about-board{ grid-template-columns:var(--about-spine) minmax(0,1fr); }
  .page-about .about-main{ border-left:0; padding-left:clamp(24px,3vw,56px); }
  .page-about .about-spine{ display:block; position:relative; }
  .page-about .about-spine::before{
    content:"";
    position:absolute;
    top:0; bottom:0; right:0;
    width:1px;
    background:var(--line);
  }
  .page-about .about-spine__inner{
    position:sticky;
    top:112px;
    padding-right:18px;
  }
}

.page-about .spine-list{
  list-style:none;
  margin:0; padding:0;
  display:grid;
  gap:22px;
  justify-items:end;
}

.page-about .spine-link{
  display:inline-flex;
  align-items:center;
  gap:8px;
  color:var(--mute);
  text-decoration:none;
  font-size:12px;
  letter-spacing:.1em;
  transition:color var(--dur) var(--ease);
}

.page-about .spine-link::after{
  content:"";
  width:7px; height:7px;
  border:1px solid var(--mute);
  border-radius:50%;
  transition:border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .spine-num{ font-size:11px; opacity:.75; }

.page-about .spine-link:hover,
.page-about .spine-link:focus-visible{ color:var(--cyan); }
.page-about .spine-link:hover::after,
.page-about .spine-link:focus-visible::after{
  border-color:var(--cyan);
  background:var(--cyan);
}
.page-about .spine-link:focus-visible{
  outline:2px solid var(--cyan);
  outline-offset:4px;
}

.page-about .about-hero{
  display:grid;
  gap:30px;
  padding-top:clamp(8px,2vh,24px);
}

.page-about .about-hero h1{
  font-family:var(--font-display);
  font-weight:900;
  font-size:clamp(34px,7vw,72px);
  line-height:1.06;
  letter-spacing:-.02em;
  margin:14px 0 0;
  color:var(--ink);
}

.page-about .about-hero .lede{
  margin:22px 0 0;
  color:var(--mute);
  font-size:clamp(16px,1.1vw,18px);
  line-height:1.8;
}

.page-about .about-hero .btn-row{ margin-top:28px; }

.page-about .about-hero__media{
  margin:0;
  position:relative;
  border:1px solid var(--line);
  overflow:hidden;
  min-height:260px;
}

.page-about .about-hero__media img{
  display:block;
  width:100%;
  height:100%;
  min-height:260px;
  max-height:460px;
  object-fit:cover;
  filter:saturate(.75) contrast(1.06);
}

@media (min-width:900px){
  .page-about .about-hero{
    grid-template-columns:minmax(0,1fr) 268px;
    align-items:end;
    gap:clamp(32px,4vw,64px);
  }
  .page-about .about-hero__media{ min-height:420px; }
  .page-about .about-hero__media img{ min-height:420px; max-height:520px; }
}

.page-about .about-block{
  padding:var(--about-gap) 0;
  border-top:1px solid var(--line);
  margin-top:var(--about-gap);
}

.page-about .about-hero + .about-block{ margin-top:var(--about-gap); }

.page-about .about-block h2{
  font-family:var(--font-display);
  font-weight:900;
  font-size:clamp(25px,3.4vw,44px);
  line-height:1.14;
  letter-spacing:-.015em;
  margin:12px 0 0;
  color:var(--ink);
  max-width:20ch;
}

.page-about .about-block__body{ margin-top:26px; }
.page-about .about-block__body p{
  margin:0 0 18px;
  color:var(--mute);
  line-height:1.85;
}
.page-about .about-block__body p:last-child{ margin-bottom:0; }

.page-about .about-lead{
  margin:24px 0 0;
  color:var(--mute);
  line-height:1.85;
}

/* 清单索引 */
.page-about .about-index{
  list-style:none;
  margin:34px 0 0;
  padding:0;
  border-top:1px solid var(--line);
}

.page-about .about-index__item{ border-bottom:1px solid var(--line); }

.page-about .about-index__item a{
  display:grid;
  grid-template-columns:auto minmax(0,1fr) auto;
  grid-template-areas:
    "num name arrow"
    "num desc arrow";
  gap:4px 16px;
  align-items:center;
  padding:20px 4px;
  text-decoration:none;
  color:var(--ink);
  transition:transform var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .about-index__num{
  grid-area:num;
  color:var(--orange);
  font-size:13px;
  align-self:start;
  padding-top:3px;
}

.page-about .about-index__name{
  grid-area:name;
  font-family:var(--font-display);
  font-weight:900;
  font-size:clamp(16px,1.6vw,20px);
  letter-spacing:-.01em;
}

.page-about .about-index__desc{
  grid-area:desc;
  color:var(--mute);
  font-size:14px;
  line-height:1.7;
}

.page-about .about-index__arrow{
  grid-area:arrow;
  color:var(--mute);
  font-size:18px;
  transition:color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .about-index__item a:hover,
.page-about .about-index__item a:focus-visible{
  transform:translateY(-2px);
  background:var(--panel);
}
.page-about .about-index__item a:hover .about-index__arrow,
.page-about .about-index__item a:focus-visible .about-index__arrow{
  color:var(--cyan);
  transform:translateX(4px);
}
.page-about .about-index__item a:focus-visible{
  outline:2px solid var(--cyan);
  outline-offset:2px;
}

/* 三条准则 */
.page-about .rule-set{
  margin-top:38px;
  display:grid;
  gap:20px;
}

.page-about .rule-card{
  background:var(--paper);
  color:var(--about-paper-ink);
  border-left:4px solid var(--ochre);
  border-radius:2px;
  padding:26px 22px 22px;
  box-shadow:6px 6px 0 rgba(5,8,16,.55);
}

.page-about .rule-card__idx{
  display:block;
  font-size:13px;
  letter-spacing:.12em;
  color:var(--ochre);
  margin-bottom:10px;
}

.page-about .rule-card h3{
  font-family:var(--font-display);
  font-weight:900;
  font-size:clamp(18px,1.8vw,23px);
  line-height:1.25;
  margin:0 0 12px;
  color:var(--about-paper-ink);
}

.page-about .rule-card p{
  margin:0;
  font-size:15px;
  line-height:1.8;
  color:#2B333F;
}

.page-about .rule-more{ margin-top:16px; }

.page-about .rule-more summary{
  cursor:pointer;
  list-style:none;
  display:inline-flex;
  align-items:center;
  gap:8px;
  font-size:13px;
  letter-spacing:.04em;
  color:#6B3A22;
  border-bottom:1px solid var(--ochre);
  padding-bottom:2px;
}
.page-about .rule-more summary::-webkit-details-marker{ display:none; }
.page-about .rule-more summary::before{
  content:"＋";
  font-size:12px;
  line-height:1;
}
.page-about .rule-more[open] summary::before{ content:"－"; }
.page-about .rule-more summary:focus-visible{
  outline:2px solid var(--ochre);
  outline-offset:3px;
}
.page-about .rule-more p{
  margin-top:12px;
  padding-left:12px;
  border-left:2px solid rgba(180,85,47,.45);
  font-size:14px;
  color:#3A424F;
}

@media (min-width:900px){
  .page-about .rule-set{ grid-template-columns:repeat(3,minmax(0,1fr)); gap:22px; }
}

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

.page-about .about-track__tex{
  position:absolute;
  inset:0;
  overflow:hidden;
  pointer-events:none;
  z-index:0;
}
.page-about .about-track__tex img{
  width:100%;
  height:100%;
  object-fit:cover;
  opacity:.08;
}
.page-about .about-track > *:not(.about-track__tex){ position:relative; z-index:1; }

.page-about .track-list{
  list-style:none;
  margin:40px 0 0;
  padding:0;
  display:grid;
  gap:26px;
  border-top:1px solid var(--line);
}

.page-about .track-node{
  position:relative;
  padding:22px 0 0 26px;
  border-left:1px solid var(--line);
  margin-left:5px;
}

.page-about .track-dot{
  position:absolute;
  left:-6px;
  top:24px;
  width:11px; height:11px;
  border-radius:50%;
  background:var(--orange);
  box-shadow:0 0 0 4px rgba(255,106,43,.14);
}

.page-about .track-code{
  display:inline-block;
  font-size:13px;
  letter-spacing:.14em;
  color:var(--orange);
  margin-right:10px;
}
.page-about .track-year{
  display:inline-block;
  font-size:12px;
  letter-spacing:.1em;
  color:var(--mute);
}

.page-about .track-title{
  font-family:var(--font-display);
  font-weight:900;
  font-size:clamp(18px,1.9vw,24px);
  margin:10px 0 10px;
  color:var(--ink);
  line-height:1.2;
}

.page-about .track-desc{
  margin:0;
  color:var(--mute);
  font-size:15px;
  line-height:1.8;
}

.page-about .track-peek{
  margin:14px 0 0;
  font-size:13px;
  line-height:1.7;
  color:var(--ochre);
  border-left:2px solid rgba(180,85,47,.5);
  padding-left:10px;
  max-height:0;
  opacity:0;
  overflow:hidden;
  transition:max-height var(--dur) var(--ease), opacity var(--dur) var(--ease);
}

.page-about .track-node:hover .track-peek,
.page-about .track-node:focus-within .track-peek{
  max-height:90px;
  opacity:1;
}

@media (hover:none){
  .page-about .track-peek{ max-height:none; opacity:1; }
}

@media (min-width:860px){
  .page-about .track-list{
    grid-template-columns:repeat(3,minmax(0,1fr));
    gap:0;
    border-top:0;
    padding-top:8px;
    border-top:1px solid var(--line);
  }
  .page-about .track-node{
    border-left:0;
    margin-left:0;
    padding:34px 24px 0 0;
    transition:transform var(--dur) var(--ease);
  }
  .page-about .track-dot{
    left:0;
    top:-6px;
    box-shadow:0 0 0 4px var(--bg);
  }
  .page-about .track-node:nth-child(2){ padding-top:76px; }
  .page-about .track-node:nth-child(3){ padding-top:118px; }
  .page-about .track-node:hover{ transform:translateY(-2px); }
  .page-about .track-peek{ margin-top:16px; }
}

/* 团队 */
.page-about .team-grid{
  margin-top:32px;
  display:grid;
  gap:28px;
}

.page-about .team-text p{
  margin:0 0 18px;
  color:var(--mute);
  line-height:1.85;
}
.page-about .team-text p:last-child{ margin-bottom:0; }

.page-about .team-media{
  margin:0;
  border:1px solid var(--line);
  overflow:hidden;
}
.page-about .team-media img{
  display:block;
  width:100%;
  height:auto;
  aspect-ratio:14/9;
  object-fit:cover;
  filter:saturate(.7) contrast(1.05);
}

.page-about .data-strip{ margin-top:38px; }

@media (min-width:900px){
  .page-about .team-grid{
    grid-template-columns:minmax(0,1.05fr) minmax(0,1fr);
    align-items:start;
    gap:clamp(28px,4vw,60px);
  }
}

/* 协作网络 */
.page-about .net-list{
  list-style:none;
  margin:34px 0 0;
  padding:0;
  display:grid;
  gap:22px;
}

.page-about .net-list li{
  padding:20px 20px 20px 22px;
  background:var(--panel);
  border:1px solid var(--line);
  border-radius:2px;
  transition:border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.page-about .net-list li:hover{
  border-color:var(--cyan);
  transform:translateY(-2px);
}

.page-about .net-list h3{
  font-family:var(--font-display);
  font-weight:900;
  font-size:clamp(16px,1.5vw,19px);
  margin:0 0 8px;
  color:var(--ink);
}
.page-about .net-list p{
  margin:0;
  color:var(--mute);
  font-size:15px;
  line-height:1.75;
}

.page-about .about-honor{
  margin:30px 0 0;
  padding:16px 0 0;
  border-top:1px solid var(--line);
  color:var(--ink);
  font-size:15px;
  line-height:1.7;
  display:flex;
  gap:12px;
  align-items:flex-start;
}
.page-about .about-honor::before{
  content:"";
  flex:0 0 auto;
  width:3px;
  align-self:stretch;
  background:var(--cyan);
}

@media (min-width:860px){
  .page-about .net-list{ grid-template-columns:repeat(3,minmax(0,1fr)); }
}

/* 路线 */
.page-about .road-list{
  list-style:none;
  margin:34px 0 0;
  padding:0;
  display:grid;
  gap:0;
}

.page-about .road-list li{
  display:grid;
  grid-template-columns:auto minmax(0,1fr);
  gap:16px;
  padding:22px 0;
  border-bottom:1px solid var(--line);
}
.page-about .road-list li:first-child{ border-top:1px solid var(--line); }

.page-about .road-num{
  color:var(--cyan);
  font-size:13px;
  letter-spacing:.12em;
  padding-top:4px;
}

.page-about .road-list h3{
  font-family:var(--font-display);
  font-weight:900;
  font-size:clamp(17px,1.6vw,21px);
  margin:0 0 8px;
  color:var(--ink);
  line-height:1.25;
}

.page-about .road-list p{
  margin:0;
  color:var(--mute);
  font-size:15px;
  line-height:1.8;
}

.page-about .about-cta{
  margin-top:38px;
  padding:26px 22px;
  border:1px solid var(--line);
  border-left:3px solid var(--orange);
  background:var(--panel);
  border-radius:2px;
}

.page-about .about-cta p{
  margin:0;
  color:var(--ink);
  font-size:clamp(16px,1.4vw,18px);
  line-height:1.7;
}

.page-about .about-cta .btn-row{ margin-top:20px; }

@media (prefers-reduced-motion:reduce){
  .page-about *{
    transition-duration:1ms !important;
    animation-duration:1ms !important;
  }
  .page-about .about-index__item a:hover,
  .page-about .net-list li:hover,
  .page-about .track-node:hover{ transform:none; }
}
<<<END>>>