*{box-sizing:border-box}



html{scroll-behavior:smooth}



body{

margin:0;

font-family:Arial,Helvetica,sans-serif;

background:#f6f8fc;

color:#172033;

line-height:1.75;

}



a{

color:#155eef;

text-decoration:none;

}



.header{

background:#fff;

border-bottom:1px solid #e6ebf2;

position:sticky;

top:0;

z-index:10;

}



.nav{

max-width:1100px;

margin:auto;

padding:16px 22px;

display:flex;

justify-content:space-between;

align-items:center;

gap:20px;

}



.brand{

font-weight:800;

font-size:18px;

color:#172033;

}



.brand span{

color:#155eef;

}



.back{

font-size:14px;

font-weight:700;

}



.hero{

background:linear-gradient(135deg,#edf4ff,#ffffff);

border-bottom:1px solid #e5ebf5;

}



.hero-inner{

max-width:900px;

margin:auto;

padding:70px 22px;

}



.badge{

display:inline-block;

padding:7px 12px;

background:#eaf1ff;

color:#155eef;

border-radius:30px;

font-size:11px;

font-weight:800;

letter-spacing:.5px;

margin-bottom:16px;

}



h1{

font-size:42px;

line-height:1.2;

margin:0 0 20px;

}



.hero p{

font-size:18px;

color:#536176;

max-width:760px;

margin:0;

}



.container{

max-width:900px;

margin:auto;

padding:50px 22px 70px;

}



.article{

background:#fff;

border:1px solid #e6ebf2;

border-radius:18px;

padding:40px;

box-shadow:0 8px 30px rgba(20,30,50,.04);

}



h2{

font-size:28px;

line-height:1.3;

margin-top:45px;

}



h3{

font-size:21px;

margin-top:28px;

}



p{

font-size:16px;

color:#39465a;

}



ul{

padding-left:22px;

color:#39465a;

}



li{

margin:8px 0;

}



.info{

margin:28px 0;

padding:20px;

border-left:4px solid #155eef;

background:#f3f7ff;

border-radius:10px;

color:#34435a;

}



.related{

margin-top:45px;

padding-top:30px;

border-top:1px solid #e6ebf2;

}



.cards{

display:grid;

grid-template-columns:repeat(auto-fit,minmax(220px,1fr));

gap:16px;

margin-top:20px;

}



.card{

border:1px solid #e3e9f2;

border-radius:14px;

padding:20px;

background:#fbfcfe;

}



.card strong{

display:block;

font-size:17px;

margin-bottom:8px;

color:#172033;

}



.disclaimer{

margin-top:40px;

padding:18px;

font-size:13px;

background:#fff8e8;

border:1px solid #f3dfad;

border-radius:12px;

color:#66552e;

}



.footer{

border-top:1px solid #e6ebf2;

background:#fff;

padding:28px 22px;

text-align:center;

font-size:13px;

color:#718096;

}



@media(max-width:700px){

h1{font-size:32px}

.hero-inner{padding:50px 20px}

.article{padding:25px 20px}

.nav{padding:14px 18px}

}

.table-of-contents{

  margin:24px 0;

  border:1px solid #e1e6ee;

  border-radius:12px;

  background:#f8fafc;

  overflow:hidden;

}



.toc-toggle{

  width:100%;

  border:0;

  background:#071b35;

  color:#fff;

  padding:16px 18px;

  font-size:16px;

  font-weight:700;

  display:flex;

  justify-content:space-between;

  align-items:center;

  cursor:pointer;

}



.toc-arrow{

  font-size:18px;

  line-height:1;

}



.toc-content{

  display:none;

  padding:14px 22px;

}



.table-of-contents.open .toc-content{

  display:block;

}



.toc-content ul{

  margin:0;

  padding-left:18px;

}



.toc-content li{

  margin:10px 0;

}



.toc-content a{

  color:#0d3b66;

  text-decoration:none;

  font-weight:600;

}



.toc-content a:hover{

  text-decoration:underline;

}



@media(max-width:600px){

  .toc-toggle{

    padding:15px;

  }



  .toc-content{

    padding:12px 18px;

  }

}

.author-box{

    margin:30px 0;

    padding:20px;

    border:1px solid #ddd;

    border-radius:10px;

    background:#f8f9fa;

}

.author-box strong{

    display:block;

    font-size:18px;

    margin-bottom:5px;

}

.author-box span{

    display:block;

    font-size:14px;

    margin-bottom:12px;

    color:#555;

}

.author-box p{

    margin:0;

    line-height:1.6;

}