/* ============================================================
   关于安博 /about-us/ —— 页面作用域 .page-about
   ============================================================ */

.page-about{
  --about-glow:rgba(242,178,60,.18);
  --about-soft:rgba(20,58,44,.55);
  --about-track:rgba(44,59,52,.6);
}

/* ---------- 通用小节头 ---------- */
.page-about .about-head{
  display:grid;
  gap:var(--sp-3);
  max-width:38em;
}
.page-about .about-head .display-2{
  margin:0;
}
.page-about .about-head .lede{
  margin:0;
}

/* ============================================================
   首屏
   ============================================================ */
.page-about .about-hero{
  position:relative;
  isolation:isolate;
  overflow:hidden;
  padding:var(--sp-4) 0 var(--sp-6);
  background:linear-gradient(180deg,var(--pitch-900) 0%,var(--ink-950) 84%);
}
.page-about .about-hero::before{
  content:"";
  position:absolute;
  top:-160px;
  right:-140px;
  width:420px;
  height:420px;
  border-radius:50%;
  background:radial-gradient(circle at 50% 50%,var(--about-glow),rgba(242,178,60,0) 68%);
  pointer-events:none;
  z-index:0;
}
.page-about .about-hero::after{
  content:"";
  position:absolute;
  left:0;
  right:0;
  bottom:0;
  height:34%;
  background-image:repeating-linear-gradient(180deg,var(--about-track) 0 1px,transparent 1px 26px);
  -webkit-mask-image:linear-gradient(180deg,transparent,#000 72%);
  mask-image:linear-gradient(180deg,transparent,#000 72%);
  pointer-events:none;
  z-index:0;
}
.page-about .about-hero__inner{
  position:relative;
  z-index:1;
  display:grid;
  gap:var(--sp-5);
}
.page-about .about-hero__copy{
  display:grid;
  gap:var(--sp-3);
  align-content:start;
}
.page-about .about-hero .display-1{
  margin:0;
  max-width:15em;
}
.page-about .about-hero .lede{
  margin:0;
  max-width:34em;
}

.page-about .about-hero__facts{
  list-style:none;
  margin:var(--sp-2) 0 0;
  padding:0;
  display:flex;
  flex-wrap:wrap;
  gap:var(--sp-2);
}
.page-about .about-hero__facts li{
  display:inline-flex;
  align-items:baseline;
  gap:6px;
  padding:6px 14px;
  border:1px solid var(--line-200);
  border-radius:var(--r-pill);
  background:var(--about-soft);
  font-size:13px;
  letter-spacing:.02em;
  color:var(--cool-300);
}
.page-about .about-hero__facts b{
  font-family:var(--font-mono);
  font-size:15px;
  font-weight:700;
  color:var(--amber-400);
}

.page-about .about-hero__actions{
  display:flex;
  flex-wrap:wrap;
  gap:var(--sp-3);
  margin-top:var(--sp-2);
}
.page-about .about-hero__actions .btn{
  min-height:44px;
}

.page-about .about-hero__media{
  position:relative;
  margin:0;
  border:1px solid var(--line-200);
  border-radius:var(--r-panel);
  overflow:hidden;
  box-shadow:var(--shadow-2);
  background:var(--pitch-900);
}
.page-about .about-hero__media .media__img{
  display:block;
  width:100%;
  height:auto;
  object-fit:cover;
}
.page-about .about-hero__media .media__caption{
  font-size:13px;
  color:var(--cool-300);
}

@media (min-width:900px){
  .page-about .about-hero{
    padding:var(--sp-6) 0 var(--sp-7);
  }
  .page-about .about-hero__inner{
    grid-template-columns:minmax(0,1.05fr) minmax(0,.95fr);
    align-items:center;
    gap:var(--sp-6);
  }
  .page-about .about-hero__media{
    aspect-ratio:14/9;
  }
  .page-about .about-hero__media .media__img{
    height:100%;
  }
}

/* ============================================================
   起点
   ============================================================ */
.page-about .about-origin__grid{
  display:grid;
  gap:var(--sp-5);
}
.page-about .about-origin__copy{
  display:grid;
  gap:var(--sp-3);
}
.page-about .about-origin__copy .display-2{
  margin:0;
  max-width:20em;
}
.page-about .about-origin__copy p{
  margin:0;
  max-width:36em;
  color:var(--cool-300);
  line-height:1.8;
}
.page-about .about-origin__copy p:first-of-type{
  color:var(--chalk-050);
}

.page-about .about-origin__aside{
  border-radius:var(--r-panel);
  background:linear-gradient(180deg,var(--pitch-900),var(--ink-950));
  border-color:var(--line-200);
}
.page-about .about-origin__aside .label{
  color:var(--amber-400);
}
.page-about .about-origin__rules{
  list-style:none;
  margin:var(--sp-3) 0 0;
  padding:0;
  display:grid;
  gap:var(--sp-4);
}
.page-about .about-origin__rules li{
  display:grid;
  grid-template-columns:auto minmax(0,1fr);
  gap:var(--sp-3);
  align-items:start;
  padding-top:var(--sp-4);
  border-top:1px solid var(--line-200);
}
.page-about .about-origin__rules li:first-child{
  padding-top:0;
  border-top:0;
}
.page-about .about-origin__num{
  font-family:var(--font-mono);
  font-size:14px;
  font-weight:700;
  color:var(--amber-400);
  letter-spacing:.06em;
}
.page-about .about-origin__rules h3{
  margin:0 0 6px;
  font-size:16px;
  line-height:1.5;
}
.page-about .about-origin__rules p{
  margin:0;
  font-size:14px;
  line-height:1.75;
  color:var(--cool-300);
}

@media (min-width:960px){
  .page-about .about-origin__grid{
    grid-template-columns:minmax(0,1.35fr) minmax(0,.65fr);
    gap:var(--sp-6);
    align-items:start;
  }
  .page-about .about-origin__aside{
    position:sticky;
    top:var(--sp-5);
  }
}

/* ============================================================
   版本时间轴
   ============================================================ */
.page-about .about-timeline{
  list-style:none;
  margin:var(--sp-5) 0 0;
  padding:0;
  position:relative;
  display:grid;
  gap:var(--sp-5);
}
.page-about .about-timeline::before{
  content:"";
  position:absolute;
  left:16px;
  top:10px;
  bottom:10px;
  width:2px;
  border-radius:2px;
  background:linear-gradient(180deg,var(--amber-400),var(--line-200) 62%);
}
.page-about .about-timeline__item{
  position:relative;
  padding-left:50px;
}
.page-about .about-timeline__node{
  position:absolute;
  left:0;
  top:0;
  width:34px;
  height:34px;
  border-radius:50%;
  border:2px solid var(--amber-400);
  background:var(--ink-950);
  display:grid;
  place-items:center;
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:700;
  letter-spacing:.04em;
  color:var(--amber-400);
}
.page-about .about-timeline__panel{
  display:grid;
  gap:var(--sp-2);
  border-radius:var(--r-card);
  background:linear-gradient(180deg,var(--pitch-900),var(--ink-950));
  border-color:var(--line-200);
  outline:none;
}
.page-about .about-timeline__panel .label{
  color:var(--cool-300);
}
.page-about .about-timeline__panel:focus-visible{
  box-shadow:0 0 0 2px var(--amber-200),0 0 0 4px rgba(255,217,138,.25);
}
.page-about .about-timeline__title{
  margin:0;
  font-size:18px;
  line-height:1.45;
}
.page-about .about-timeline__panel > p{
  margin:0;
  font-size:15px;
  line-height:1.78;
  color:var(--cool-300);
}
.page-about .about-timeline__panel > p:not(.about-timeline__detail){
  color:var(--chalk-050);
}
.page-about .about-timeline__detail{
  color:var(--cool-300);
}

@media (min-width:960px){
  .page-about .about-timeline{
    gap:0;
  }
  .page-about .about-timeline::before{
    left:50%;
    top:6px;
    bottom:6px;
    transform:translateX(-1px);
  }
  .page-about .about-timeline__item{
    padding:var(--sp-4) 0;
    display:grid;
    grid-template-columns:minmax(0,1fr) 92px minmax(0,1fr);
    align-items:start;
  }
  .page-about .about-timeline__node{
    position:static;
    grid-column:2;
    grid-row:1;
    justify-self:center;
    margin-top:var(--sp-3);
  }
  .page-about .about-timeline__panel{
    grid-column:1;
    grid-row:1;
    margin-right:var(--sp-5);
  }
  .page-about .about-timeline__item:nth-child(even) .about-timeline__panel{
    grid-column:3;
    margin-right:0;
    margin-left:var(--sp-5);
  }
  .page-about .about-timeline__detail{
    max-height:0;
    opacity:0;
    overflow:hidden;
    margin-top:0;
    transition:max-height var(--dur) var(--ease),opacity var(--dur) var(--ease),margin-top var(--dur) var(--ease);
  }
  .page-about .about-timeline__panel:hover .about-timeline__detail,
  .page-about .about-timeline__panel:focus-within .about-timeline__detail{
    max-height:14em;
    opacity:1;
    margin-top:var(--sp-2);
  }
}

/* ---------- 版本对比表 ---------- */
.page-about .about-version-table{
  margin-top:var(--sp-6);
  border:1px solid var(--line-200);
  border-radius:var(--r-panel);
  background:var(--pitch-900);
  overflow-x:auto;
  -webkit-overflow-scrolling:touch;
}
.page-about .about-version-table table{
  width:100%;
  min-width:620px;
  border-collapse:collapse;
  font-size:14px;
}
.page-about .about-version-table th,
.page-about .about-version-table td{
  padding:var(--sp-4);
  text-align:left;
  vertical-align:top;
  border-bottom:1px solid var(--line-200);
}
.page-about .about-version-table thead th{
  font-size:12px;
  letter-spacing:.1em;
  text-transform:uppercase;
  color:var(--cool-300);
  font-weight:600;
  background:rgba(7,19,15,.6);
}
.page-about .about-version-table tbody th{
  font-family:var(--font-mono);
  font-size:16px;
  color:var(--amber-400);
  letter-spacing:.04em;
  white-space:nowrap;
}
.page-about .about-version-table tbody td{
  color:var(--cool-300);
  line-height:1.7;
}
.page-about .about-version-table tbody tr:last-child th,
.page-about .about-version-table tbody tr:last-child td{
  border-bottom:0;
}
.page-about .about-version-table tbody tr:hover{
  background:rgba(20,58,44,.45);
}
.page-about .about-version-table td.num{
  font-family:var(--font-mono);
  color:var(--chalk-050);
}

/* ============================================================
   数据运营
   ============================================================ */
.page-about .about-data__shell{
  border-radius:var(--r-panel);
  background:linear-gradient(180deg,var(--pitch-900) 0%,var(--ink-950) 70%);
  border-color:var(--line-200);
}
.page-about .about-data__grid{
  display:grid;
  gap:var(--sp-5);
}
.page-about .about-data__copy{
  display:grid;
  gap:var(--sp-3);
}
.page-about .about-data__copy .display-2{
  margin:0;
  max-width:18em;
}
.page-about .about-data__copy p{
  margin:0;
  max-width:36em;
  color:var(--cool-300);
  line-height:1.8;
}
.page-about .about-data__copy p:first-of-type{
  color:var(--chalk-050);
}

.page-about .about-data__stats{
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:var(--sp-3);
  align-content:start;
}
.page-about .about-data__stat{
  padding:var(--sp-3) var(--sp-4);
  border:1px solid var(--line-200);
  border-radius:var(--r-card);
  background:linear-gradient(180deg,rgba(20,58,44,.7),rgba(7,19,15,.9));
  transition:border-color var(--dur) var(--ease),transform var(--dur) var(--ease);
}
.page-about .about-data__stat:hover{
  border-color:var(--amber-400);
  transform:translateY(-2px);
}
.page-about .about-data__stat b{
  display:block;
  font-family:var(--font-mono);
  font-size:30px;
  font-weight:700;
  line-height:1.1;
  color:var(--amber-400);
  letter-spacing:-.01em;
}
.page-about .about-data__stat span{
  display:block;
  margin-top:8px;
  font-size:13px;
  line-height:1.65;
  color:var(--cool-300);
}

.page-about .about-data__media{
  margin:var(--sp-5) 0 0;
  position:relative;
  border-radius:var(--r-card);
  overflow:hidden;
  border:1px solid var(--line-200);
}
.page-about .about-data__media .media__img{
  display:block;
  width:100%;
  height:auto;
  object-fit:cover;
}
.page-about .about-data__media .media__caption{
  font-size:13px;
  color:var(--cool-300);
}

@media (min-width:960px){
  .page-about .about-data__grid{
    grid-template-columns:minmax(0,1.15fr) minmax(0,.85fr);
    gap:var(--sp-6);
    align-items:start;
  }
  .page-about .about-data__media{
    max-height:360px;
  }
  .page-about .about-data__media .media__img{
    height:360px;
  }
}

/* ============================================================
   覆盖面
   ============================================================ */
.page-about .about-coverage__grid{
  list-style:none;
  margin:var(--sp-5) 0 0;
  padding:0;
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:var(--sp-3);
}
.page-about .about-coverage__tile{
  position:relative;
  display:grid;
  gap:6px;
  padding:var(--sp-4);
  border:1px solid var(--line-200);
  border-radius:var(--r-card);
  background:linear-gradient(180deg,var(--pitch-900),var(--ink-950));
  overflow:hidden;
  transition:border-color var(--dur) var(--ease),transform var(--dur) var(--ease),background-color var(--dur) var(--ease);
}
.page-about .about-coverage__tile::after{
  content:"";
  position:absolute;
  left:0;
  right:0;
  bottom:0;
  height:2px;
  background:linear-gradient(90deg,var(--amber-400),rgba(242,178,60,0));
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform var(--dur) var(--ease);
}
.page-about .about-coverage__tile:hover{
  border-color:var(--amber-400);
  transform:translateY(-2px);
}
.page-about .about-coverage__tile:hover::after{
  transform:scaleX(1);
}
.page-about .about-coverage__value{
  font-family:var(--font-mono);
  font-size:34px;
  font-weight:700;
  line-height:1.05;
  color:var(--chalk-050);
  letter-spacing:-.02em;
}
.page-about .about-coverage__plus,
.page-about .about-coverage__unit{
  font-family:var(--font-body);
  font-size:16px;
  font-weight:600;
  color:var(--amber-400);
  margin-left:2px;
}
.page-about .about-coverage__label{
  font-size:13px;
  line-height:1.6;
  color:var(--cool-300);
}

.page-about .about-coverage__notes{
  display:grid;
  gap:var(--sp-4);
  margin-top:var(--sp-5);
}
.page-about .about-coverage__note{
  padding-left:var(--sp-4);
  border-left:2px solid var(--amber-400);
}
.page-about .about-coverage__note h3{
  margin:0 0 8px;
  font-size:17px;
  line-height:1.5;
}
.page-about .about-coverage__note p{
  margin:0;
  max-width:40em;
  font-size:15px;
  line-height:1.78;
  color:var(--cool-300);
}

.page-about .about-coverage__media{
  margin:var(--sp-6) 0 0;
  position:relative;
  border-radius:var(--r-panel);
  overflow:hidden;
  border:1px solid var(--line-200);
}
.page-about .about-coverage__media .media__img{
  display:block;
  width:100%;
  height:auto;
  object-fit:cover;
}
.page-about .about-coverage__media .media__caption{
  font-size:13px;
  color:var(--cool-300);
}

@media (min-width:720px){
  .page-about .about-coverage__grid{
    grid-template-columns:repeat(3,minmax(0,1fr));
    gap:var(--sp-4);
  }
  .page-about .about-coverage__notes{
    grid-template-columns:repeat(2,minmax(0,1fr));
    gap:var(--sp-5);
  }
}

/* ============================================================
   长期在意的三件事
   ============================================================ */
.page-about .about-commit__list{
  list-style:none;
  margin:var(--sp-5) 0 0;
  padding:0;
  display:grid;
  gap:var(--sp-4);
}
.page-about .about-commit__item{
  position:relative;
  display:grid;
  gap:var(--sp-2);
  padding:var(--sp-5) var(--sp-4) var(--sp-4);
  border:1px solid var(--line-200);
  border-radius:var(--r-panel);
  background:linear-gradient(180deg,rgba(20,58,44,.55),rgba(7,19,15,.95));
}
.page-about .about-commit__num{
  font-family:var(--font-mono);
  font-size:40px;
  font-weight:700;
  line-height:1;
  color:rgba(242,178,60,.18);
  letter-spacing:-.02em;
}
.page-about .about-commit__item h3{
  margin:0;
  font-size:19px;
  line-height:1.45;
}
.page-about .about-commit__item p{
  margin:0;
  font-size:15px;
  line-height:1.8;
  color:var(--cool-300);
}

@media (min-width:900px){
  .page-about .about-commit__list{
    grid-template-columns:repeat(3,minmax(0,1fr));
    gap:var(--sp-5);
  }
}

/* ============================================================
   下一页入口
   ============================================================ */
.page-about .about-next__grid{
  display:grid;
  gap:var(--sp-4);
  margin-top:var(--sp-5);
}
.page-about .about-next__card{
  display:flex;
  flex-direction:column;
  gap:var(--sp-2);
  text-decoration:none;
  color:inherit;
  border-radius:var(--r-card);
  background:linear-gradient(180deg,var(--pitch-900),var(--ink-950));
  border-color:var(--line-200);
  min-height:44px;
}
.page-about .about-next__card .label{
  color:var(--amber-400);
}
.page-about .about-next__card h3{
  margin:0;
  font-size:18px;
  line-height:1.45;
  color:var(--chalk-050);
}
.page-about .about-next__card p{
  margin:0;
  font-size:14px;
  line-height:1.75;
  color:var(--cool-300);
}
.page-about .about-next__go{
  margin-top:auto;
  padding-top:var(--sp-3);
  font-size:14px;
  font-weight:600;
  color:var(--amber-400);
  letter-spacing:.02em;
}
.page-about .about-next__go::after{
  content:" →";
  display:inline-block;
  transition:transform var(--dur) var(--ease);
}
.page-about .about-next__card:hover .about-next__go::after,
.page-about .about-next__card:focus-visible .about-next__go::after{
  transform:translateX(3px);
}
.page-about .about-next__card:focus-visible{
  outline:2px solid var(--amber-200);
  outline-offset:2px;
}

@media (min-width:800px){
  .page-about .about-next__grid{
    grid-template-columns:repeat(3,minmax(0,1fr));
    gap:var(--sp-5);
  }
}

/* ============================================================
   动效降级
   ============================================================ */
@media (prefers-reduced-motion:reduce){
  .page-about .about-data__stat,
  .page-about .about-coverage__tile,
  .page-about .about-next__go::after,
  .page-about .about-timeline__detail{
    transition:none;
  }
  .page-about .about-data__stat:hover,
  .page-about .about-coverage__tile:hover{
    transform:none;
  }
  .page-about .about-next__card:hover .about-next__go::after{
    transform:none;
  }
}
</main>