*{box-sizing:border-box}

body{margin:0;font-family:Arial,sans-serif;color:#222;background:#f7f8fa;line-height:1.7}

a{text-decoration:none;color:inherit}



header{background:#0b1f3a;color:#fff;padding:16px 0}

.header-inner{max-width:1100px;margin:auto;padding:0 20px}

.brand{font-size:22px;font-weight:700}

nav{margin-top:10px;display:flex;flex-wrap:wrap;gap:18px}

nav a{font-size:14px;color:#dce8f8}



main{max-width:900px;margin:35px auto;padding:0 20px}

article{background:#fff;padding:35px;border-radius:14px;box-shadow:0 2px 10px rgba(0,0,0,.05)}



h1,h2{color:#102a43;line-height:1.3}

h1{font-size:34px;margin-top:0}

h2{font-size:25px;margin-top:35px}

p,li{font-size:17px}



.intro{font-size:19px;color:#46566b}

.box{background:#eef5ff;border-left:4px solid #0b63ce;padding:18px;border-radius:8px;margin:24px 0}

.example{background:#fafafa;border:1px solid #e3e8ef;padding:18px;border-radius:10px;margin:20px 0}



.related{margin-top:35px;padding-top:20px;border-top:1px solid #ddd}

.related a{color:#0b63ce}



.disclaimer{margin-top:35px;background:#fff8e8;border:1px solid #f0dfad;padding:18px;border-radius:10px;color:#5c4b1d}



footer{text-align:center;padding:25px 20px 40px;color:#667085;font-size:14px}



@media(max-width:600px){

main{margin:20px auto;padding:0 12px}

article{padding:22px 18px}

h1{font-size:28px}

h2{font-size:23px}

p,li{font-size:16px}

}

.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;

}