@import url('https://fonts.googleapis.com/css2?family=Atkinson+Hyperlegible:wght@400;700&display=swap');

:root{
  --ink:#000000;
  --paper:#ffffff;
  --hair:rgba(0,0,0,.16);
  --bar:40px;
  --side:264px;
}

*{box-sizing:border-box}

html{scroll-behavior:smooth}

body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:"Atkinson Hyperlegible","PingFang SC","Hiragino Sans GB","Microsoft YaHei",Helvetica,Arial,sans-serif;
  font-size:17px;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}

p{margin:0}

a{color:var(--ink)}

a:focus-visible,
button:focus-visible,
input:focus-visible{
  outline:3px solid var(--ink);
  outline-offset:2px;
}

@keyframes rise{
  from{opacity:0;transform:translateY(8px)}
  to{opacity:1;transform:none}
}

/* 顶部细条 */
.ticker{
  position:fixed;
  top:0;left:0;right:0;
  height:var(--bar);
  z-index:50;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  padding:0 20px;
  background:var(--ink);
  color:var(--paper);
  font-size:16px;
  line-height:1.5;
}

.tk-name{
  font-weight:700;
  letter-spacing:.04em;
  white-space:nowrap;
  overflow:hidden;
  text-overflow:ellipsis;
}

.tk-top{
  flex:none;
  display:flex;
  align-items:center;
  min-height:var(--bar);
  color:var(--paper);
  text-decoration:none;
  border-bottom:2px solid transparent;
}

.tk-top:hover{border-bottom-color:var(--paper)}

/* 左侧栏 */
.side{
  position:fixed;
  top:var(--bar);
  bottom:0;
  left:0;
  width:var(--side);
  z-index:40;
  display:flex;
  flex-direction:column;
  gap:22px;
  padding:24px 20px;
  background:var(--paper);
  border-right:1px solid var(--ink);
  overflow:auto;
}

.brand{
  display:flex;
  align-items:flex-start;
  gap:10px;
  text-decoration:none;
  color:var(--ink);
}

.mark{
  flex:none;
  width:34px;
  height:34px;
  object-fit:cover;
  border:1px solid var(--ink);
  border-radius:4px;
}

.bt{
  font-size:19px;
  font-weight:700;
  line-height:1.35;
  letter-spacing:-.01em;
}

.side nav p{
  display:flex;
  flex-direction:column;
  gap:2px;
}

.side nav a{
  position:relative;
  display:flex;
  align-items:center;
  gap:10px;
  min-height:44px;
  padding:8px 0;
  font-size:16px;
  line-height:1.5;
  color:var(--ink);
  text-decoration:none;
  border-bottom:1px solid var(--hair);
  animation:rise .5s cubic-bezier(.2,.6,.3,1) both;
  animation-delay:calc(var(--i,0) * 55ms);
}

.side nav a::before{
  content:"";
  flex:none;
  width:9px;
  height:9px;
  border:1px solid var(--ink);
  border-radius:50%;
  transition:background .2s;
}

.side nav a::after{
  content:"";
  position:absolute;
  left:0;right:0;bottom:-1px;
  height:2px;
  background:var(--ink);
  transform:scaleX(0);
  transform-origin:left;
  transition:transform .25s ease;
}

.side nav a:hover::before{background:var(--ink)}
.side nav a:hover{transform:translateX(3px);transition:transform .2s ease}
.side nav a:hover::after{transform:scaleX(1)}

/* 主区 */
main{
  margin-left:var(--side);
  padding-top:var(--bar);
}

.hero{
  position:relative;
  min-height:45vh;
  display:grid;
  place-items:center;
  overflow:hidden;
  background:var(--ink);
  color:var(--paper);
  clip-path:polygon(0 0,100% 0,100% calc(100% - 44px),0 100%);
}

.hero-img{
  position:absolute;
  inset:0;
  width:100%;
  height:100%;
  object-fit:cover;
  filter:grayscale(1) contrast(1.06);
}

.hero::before{
  content:"";
  position:absolute;
  inset:0;
  background:linear-gradient(180deg,rgba(0,0,0,.52),rgba(0,0,0,.76));
}

.hero::after{
  content:"";
  position:absolute;
  left:0;right:0;bottom:0;
  height:12px;
  z-index:3;
  background:var(--paper);
  clip-path:polygon(0 100%,100% calc(100% - 12px),100% 100%,0 100%);
}

.hero-in{
  position:relative;
  z-index:2;
  max-width:960px;
  padding:32px 20px;
  text-align:center;
}

h1{
  margin:0;
  font-size:clamp(28px,5.2vw,54px);
  line-height:1.16;
  font-weight:700;
  letter-spacing:-.02em;
  text-wrap:balance;
}

.wrap{
  max-width:1160px;
  margin:0 auto;
  padding:0 24px;
}

.body{
  display:grid;
  grid-template-columns:minmax(0,1fr) 300px;
  gap:48px;
  align-items:start;
  padding:40px 0 72px;
}

/* 正文 */
.prose{
  min-width:0;
  font-size:17px;
}

.prose > article{
  border-top:1px solid var(--ink);
  padding:36px 0 44px;
  scroll-margin-top:calc(var(--bar) + 16px);
}

.prose > article:first-child{
  border-top:0;
  padding-top:4px;
}

.prose h2{
  margin:0 0 16px;
  font-size:clamp(22px,3vw,32px);
  line-height:1.24;
  letter-spacing:-.01em;
}

.prose h3{
  margin:26px 0 12px;
  font-size:clamp(19px,2vw,23px);
  line-height:1.3;
}

.prose p{
  margin:0 0 16px;
  line-height:1.78;
}

.prose ul,
.prose ol{
  margin:0 0 16px;
  padding-left:22px;
}

.prose li{
  margin-bottom:8px;
  line-height:1.72;
}

.prose a{
  color:var(--ink);
  text-underline-offset:3px;
}

.prose a:hover{background:var(--ink);color:var(--paper);text-decoration:none}

.prose img{
  display:block;
  max-width:100%;
  height:auto;
  margin:20px 0;
  border-radius:4px;
  border-bottom:3px solid var(--ink);
}

.prose blockquote{
  margin:20px 0;
  padding:6px 0 6px 18px;
  border-left:4px solid var(--ink);
}

.prose blockquote p:last-child{margin-bottom:0}

.prose table{
  width:100%;
  border-collapse:collapse;
  margin:20px 0;
  font-size:16px;
}

.prose th,
.prose td{
  padding:8px 10px;
  text-align:left;
  border-bottom:1px solid var(--ink);
}

.prose th{font-weight:700;border-bottom-width:2px}

.prose hr{
  border:0;
  border-top:1px solid var(--ink);
  margin:28px 0;
}

/* 右侧栏 */
.rail{
  position:sticky;
  top:calc(var(--bar) + 24px);
  align-self:start;
  padding-left:24px;
  border-left:1px solid var(--ink);
}

.rail h2{
  margin:0 0 12px;
  font-size:16px;
  line-height:1.5;
  font-weight:700;
  letter-spacing:.14em;
}

.rail-list{
  display:flex;
  flex-direction:column;
  margin-bottom:16px;
}

.rail-list a{
  display:block;
  min-height:40px;
  padding:10px 0;
  font-size:16px;
  line-height:1.5;
  color:var(--ink);
  text-decoration:none;
  border-bottom:2px solid var(--ink);
  border-radius:0 0 4px 4px;
  animation:rise .5s cubic-bezier(.2,.6,.3,1) both;
  animation-delay:calc(var(--i,0) * 55ms);
  transition:padding .2s ease,background .2s ease,color .2s ease;
}

.rail-list a:hover,
.rail-list a.on{
  padding-left:8px;
  background:var(--ink);
  color:var(--paper);
}

.totop{
  display:block;
  min-height:44px;
  padding:10px 12px;
  font-size:16px;
  line-height:1.5;
  text-align:center;
  text-decoration:none;
  color:var(--ink);
  border:1px solid var(--ink);
  border-radius:4px;
}

.totop:hover{background:var(--ink);color:var(--paper)}

/* 页脚 */
.foot{
  margin-left:var(--side);
  padding:48px 24px 24px;
  background:var(--ink);
  color:var(--paper);
}

.foot a{color:var(--paper)}

.foot > *{
  max-width:1100px;
  margin-left:auto;
  margin-right:auto;
}

.f2{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:32px;
  align-items:start;
  padding-bottom:28px;
}

.fname{
  font-size:22px;
  font-weight:700;
  line-height:1.3;
  letter-spacing:-.01em;
  margin-bottom:8px;
}

.fline{
  font-size:16px;
  line-height:1.5;
  color:rgba(255,255,255,.72);
  word-break:break-all;
}

.sub{
  display:flex;
  flex-wrap:wrap;
  gap:8px;
  align-items:center;
}

.sub label{
  width:100%;
  font-size:16px;
  line-height:1.5;
}

.sub input{
  flex:1 1 160px;
  min-height:44px;
  padding:10px 12px;
  font:inherit;
  font-size:16px;
  color:var(--paper);
  background:var(--ink);
  border:1px solid var(--paper);
  border-radius:4px;
}

.sub input::placeholder{color:rgba(255,255,255,.62)}

.sub button{
  min-height:44px;
  padding:10px 20px;
  font:inherit;
  font-size:16px;
  font-weight:700;
  color:var(--ink);
  background:var(--paper);
  border:1px solid var(--paper);
  border-radius:4px;
  cursor:pointer;
  transition:background .2s,color .2s;
}

.sub button:hover{background:var(--ink);color:var(--paper)}

.sub .msg{
  width:100%;
  font-size:16px;
  line-height:1.5;
  color:rgba(255,255,255,.86);
}

.fdl{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:24px;
  padding-top:24px;
  border-top:1px solid rgba(255,255,255,.4);
}

.fdl dl{margin:0}

.fdl dt{margin-bottom:8px}

.fdl h2{
  margin:0;
  font-size:16px;
  line-height:1.5;
  font-weight:700;
  letter-spacing:.12em;
}

.fdl dd{
  margin:0 0 6px;
  font-size:16px;
  line-height:1.5;
  color:rgba(255,255,255,.82);
  word-break:break-all;
}

.ddl{display:flex;flex-direction:column}

.f-a{
  display:inline-block;
  min-height:40px;
  padding:8px 0;
  font-size:16px;
  text-decoration:none;
  border-bottom:1px solid rgba(255,255,255,.3);
}

.f-a:hover{border-bottom-color:var(--paper)}

.copy{
  margin-top:24px;
  padding-top:16px;
  border-top:1px solid rgba(255,255,255,.4);
  text-align:center;
  font-size:16px;
  line-height:1.5;
  color:rgba(255,255,255,.8);
}

@media (max-width:900px){
  .ticker{
    position:static;
    height:auto;
    padding:8px 16px;
  }

  .tk-top{min-height:auto;padding:4px 0}

  .side{
    position:static;
    width:auto;
    top:auto;
    bottom:auto;
    gap:14px;
    padding:16px;
    border-right:0;
    border-bottom:2px solid var(--ink);
    overflow:visible;
  }

  .side nav p{
    flex-direction:row;
    gap:8px;
    overflow-x:auto;
    -webkit-overflow-scrolling:touch;
    padding-bottom:2px;
  }

  .side nav a{
    flex:none;
    white-space:nowrap;
    min-height:44px;
    padding:8px 12px;
    border:1px solid var(--ink);
    border-radius:4px;
    transform:none;
  }

  .side nav a::before{display:none}
  .side nav a::after{display:none}

  main{
    margin-left:0;
    padding-top:0;
  }

  .hero{clip-path:polygon(0 0,100% 0,100% calc(100% - 24px),0 100%)}
  .hero::after{height:8px}

  .wrap{padding:0 16px}

  .body{
    grid-template-columns:1fr;
    gap:32px;
    padding:28px 0 48px;
  }

  .prose > article{scroll-margin-top:16px}

  .rail{
    position:static;
    padding-left:0;
    padding-top:20px;
    border-left:0;
    border-top:2px solid var(--ink);
  }

  .rail-list a{min-height:44px}

  .prose table{display:block;overflow-x:auto}

  .foot{
    margin-left:0;
    padding:32px 16px 20px;
  }

  .f2{grid-template-columns:1fr;gap:24px}

  .fdl{grid-template-columns:1fr;gap:20px}

  .f-a{min-height:44px}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}

  .side nav a,
  .rail-list a{animation:none}

  *{transition:none!important}
}

button[aria-expanded]{min-width:44px;min-height:44px}