@import url('https://fonts.googleapis.com/css2?family=Be+Vietnam+Pro:wght@300;400;500;600;700&family=Noto+Sans:wght@300;400;500;600;700&display=swap');

:root{
  --ink:#000000;
  --paper:#ffffff;
  --line:rgba(0,0,0,.14);
  --maxw:1240px;
  --pad:clamp(1.25rem,4vw,3rem);
}

*,*::before,*::after{box-sizing:border-box}

html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}

body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:'Be Vietnam Pro','Noto Sans',"Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  font-size:17px;
  line-height:1.65;
  font-weight:400;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

img{display:block;max-width:100%}
a{color:inherit}
::selection{background:var(--ink);color:var(--paper)}
:focus-visible{outline:2px solid var(--ink);outline-offset:3px}

/* 顶部：公告细条 + 品牌 + 栏目 */
.top{
  position:sticky;
  top:0;
  z-index:60;
  background:var(--paper);
  border-bottom:2px solid var(--ink);
}
.strip{background:var(--ink);color:var(--paper)}
.strip p{
  margin:0 auto;
  max-width:var(--maxw);
  padding:7px var(--pad);
  font-size:15px;
  line-height:1.5;
  letter-spacing:.02em;
  white-space:nowrap;
  overflow:hidden;
  text-overflow:ellipsis;
}
.bar{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:1rem;
  max-width:var(--maxw);
  margin:0 auto;
  padding:12px var(--pad);
}
.brand{
  display:inline-flex;
  align-items:center;
  gap:.6rem;
  min-height:44px;
  padding:4px 0;
  font-size:clamp(1.15rem,2.4vw,1.5rem);
  font-weight:900;
  letter-spacing:-.05em;
  text-decoration:none;
}
.brand__mark{height:26px;width:auto;border-radius:4px}
.jump{
  display:flex;
  align-items:center;
  gap:.1rem;
  max-width:100%;
  overflow-x:auto;
  scrollbar-width:none;
}
.jump::-webkit-scrollbar{display:none}
.jump__a{
  display:inline-flex;
  align-items:center;
  gap:.5rem;
  min-height:44px;
  padding:10px 12px;
  font-size:16px;
  font-weight:600;
  text-decoration:none;
  white-space:nowrap;
  transition:background .18s ease,color .18s ease;
}
.jump__a::before{
  content:"";
  width:6px;
  height:6px;
  flex:0 0 6px;
  background:var(--ink);
  transition:background .18s ease,transform .18s ease;
}
.jump__a:hover,.jump__a:focus-visible{background:var(--ink);color:var(--paper)}
.jump__a:hover::before,.jump__a:focus-visible::before{background:var(--paper);transform:rotate(45deg)}

/* 首屏 */
.hero{
  position:relative;
  isolation:isolate;
  overflow:hidden;
  min-height:45vh;
  display:grid;
  place-items:center;
  padding:clamp(2.5rem,8vh,5rem) var(--pad);
  background:#000;
  color:#fff;
}
.hero::before{
  content:"";
  position:absolute;
  inset:0;
  z-index:-2;
  background-image:
    linear-gradient(rgba(255,255,255,.1) 1px,transparent 1px),
    linear-gradient(90deg,rgba(255,255,255,.1) 1px,transparent 1px);
  background-size:72px 72px;
}
.hero__bg{position:absolute;inset:0;z-index:-1}
.hero__img{width:100%;height:100%;object-fit:cover;opacity:.4;filter:grayscale(1)}
.hero__in{width:100%;max-width:1000px;text-align:center}
.hero h1{
  margin:0;
  font-size:clamp(3rem,10vw,12rem);
  font-weight:900;
  line-height:.92;
  letter-spacing:-.05em;
  text-wrap:balance;
  overflow-wrap:break-word;
}

/* 主体：左文右栏 */
main{
  display:grid;
  grid-template-columns:minmax(0,1fr) 250px;
  gap:0 clamp(2rem,4vw,4rem);
  max-width:var(--maxw);
  margin:0 auto;
  padding:0 var(--pad) clamp(3rem,7vw,7rem);
  align-items:start;
}
div{min-width:0}
div > article{
  padding:clamp(2.5rem,5.5vw,5rem) 0;
  border-top:1px solid var(--line);
  scroll-margin-top:124px;
}
div > article:first-child{border-top:0}
div h2{
  margin:0 0 1rem;
  font-size:clamp(1.8rem,4.4vw,3.2rem);
  line-height:1.04;
  font-weight:900;
  letter-spacing:-.045em;
  text-wrap:balance;
}
div h3{
  margin:2.2rem 0 .7rem;
  font-size:clamp(1.25rem,2.2vw,1.6rem);
  line-height:1.2;
  font-weight:800;
  letter-spacing:-.02em;
}
div p{margin:0 0 1.15rem;max-width:62ch;font-size:1.0625rem;line-height:1.75}
div ul,div ol{margin:0 0 1.4rem;padding-left:1.35rem;max-width:62ch;line-height:1.75}
div li{margin-bottom:.55rem}
div li::marker{font-weight:700}
div a{text-decoration:underline;text-decoration-thickness:2px;text-underline-offset:3px}
div a:hover{background:var(--ink);color:var(--paper);text-decoration:none}
div strong{font-weight:800}
div blockquote{
  margin:2rem 0;
  padding:.2rem 0 .2rem 1.2rem;
  border-left:3px solid var(--ink);
  font-size:1.15rem;
  font-weight:600;
  line-height:1.55;
}
div figure{margin:2rem 0}
div img{border-radius:28px}
div table{
  display:block;
  max-width:100%;
  overflow-x:auto;
  border-collapse:collapse;
  font-size:1rem;
}
div th,div td{border-bottom:1px solid var(--line);padding:.6rem .8rem;text-align:left}
div hr{border:0;border-top:1px solid var(--line);margin:2.5rem 0}

.lede h2{margin:0 0 .9rem;font-size:clamp(2rem,5.4vw,3.6rem);line-height:1;letter-spacing:-.05em}
.subtitle{margin:0;max-width:52ch;font-size:clamp(1.05rem,1.6vw,1.2rem);line-height:1.6;font-weight:500}

/* 侧栏 */
.rail{
  position:sticky;
  top:112px;
  padding-top:clamp(2.5rem,5.5vw,5rem);
  padding-left:clamp(1rem,2vw,1.4rem);
  border-left:1px solid var(--line);
}
.rail__label{margin:0 0 .8rem;font-size:16px;font-weight:800;letter-spacing:.16em}
.rail__list{list-style:none;margin:0;padding:0;counter-reset:rail}
.rail__list li{counter-increment:rail}
.rail__list a{
  display:flex;
  align-items:baseline;
  gap:.55rem;
  min-height:44px;
  padding:10px 0;
  font-size:16px;
  text-decoration:none;
  border-bottom:1px solid var(--line);
  transition:padding-left .18s ease;
}
.rail__list a::before{content:counter(rail,decimal-leading-zero);font-size:.75rem;font-weight:700;letter-spacing:.04em}
.rail__list a:hover{padding-left:.4rem}
.rail__list a.is-active{font-weight:800;box-shadow:inset 0 -2px 0 var(--ink)}

/* 页脚 */
footer{background:var(--ink);color:var(--paper)}
.fgrid{
  display:grid;
  grid-template-columns:1.4fr repeat(3,minmax(0,1fr));
  gap:2rem;
  max-width:var(--maxw);
  margin:0 auto;
  padding:clamp(2.5rem,6vw,4rem) var(--pad) clamp(2rem,4vw,3rem);
}
.fbrand a{
  display:inline-block;
  padding:4px 0;
  min-height:44px;
  font-size:clamp(1.3rem,3vw,1.8rem);
  font-weight:900;
  letter-spacing:-.05em;
  text-decoration:none;
  color:var(--paper);
}
.fn{display:contents}
footer dl{margin:0}
footer dt{font-size:16px;font-weight:700;letter-spacing:.14em;margin-bottom:.75rem}
footer dd{margin:0}
footer dd a{
  display:inline-block;
  min-height:42px;
  padding:9px 0;
  font-size:16px;
  color:rgba(255,255,255,.8);
  text-decoration:none;
  transition:color .18s ease,transform .18s ease;
}
footer dd a:hover{color:#fff;transform:translateX(3px)}
footer :focus-visible{outline-color:#fff}
.fbot{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:1rem;
  max-width:var(--maxw);
  margin:0 auto;
  padding:1.4rem var(--pad) 2rem;
  border-top:1px solid rgba(255,255,255,.28);
}
.fbot p{margin:0;font-size:16px;color:rgba(255,255,255,.72)}
.totop{
  min-height:44px;
  padding:10px 2px;
  font-size:16px;
  font-weight:600;
  color:#fff;
  text-decoration:none;
  border-bottom:2px solid #fff;
}

/* 动效 */
@media (prefers-reduced-motion:no-preference){
  .js div > article{opacity:0;transform:translateY(18px);transition:opacity .6s ease,transform .6s ease}
  .js div > article.in{opacity:1;transform:none}
}

/* 断点 */
@media (max-width:1000px){
  main{grid-template-columns:minmax(0,1fr)}
  .rail{
    position:static;
    margin-top:1rem;
    padding:1.6rem 0 0;
    border-left:0;
    border-top:1px solid var(--line);
  }
  .rail__list{display:flex;gap:.5rem;overflow-x:auto;scrollbar-width:none}
  .rail__list::-webkit-scrollbar{display:none}
  .rail__list li{flex:0 0 auto}
  .rail__list a{border:1px solid var(--line);padding:10px 12px;white-space:nowrap}
}

@media (max-width:820px){
  .top{position:static}
  .bar{flex-wrap:wrap;gap:.5rem}
  .jump{order:3;width:100%}
  .fgrid{grid-template-columns:1fr 1fr;gap:1.5rem}
  .fbrand{grid-column:1/-1}
}

@media (max-width:520px){
  .hero{min-height:40vh}
  .strip p{font-size:14px}
  div > article{scroll-margin-top:24px}
}

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