*{box-sizing:border-box;margin:0;padding:0}

body{font-family:Arial,Helvetica,sans-serif;background:#f5f7fb;color:#1f2937;line-height:1.7}

header{background:#0f172a;color:#fff;padding:18px 20px}

.header-wrap{max-width:1100px;margin:auto;display:flex;justify-content:space-between;align-items:center;gap:20px}

.brand{font-size:18px;font-weight:700;letter-spacing:.3px}

.back-link{color:#cbd5e1;text-decoration:none;font-size:14px}

.back-link:hover{color:#fff}

main{max-width:900px;margin:0 auto;padding:50px 20px}

.article{background:#fff;padding:45px;border-radius:14px;box-shadow:0 8px 30px rgba(15,23,42,.08)}

.badge{display:inline-block;background:#e0e7ff;color:#3730a3;padding:6px 12px;border-radius:999px;font-size:13px;font-weight:700;margin-bottom:18px}

h1{font-size:38px;line-height:1.2;margin-bottom:20px;color:#0f172a}

h2{font-size:27px;margin-top:38px;margin-bottom:14px;color:#111827}

h3{font-size:20px;margin-top:24px;margin-bottom:10px;color:#1f2937}

p{margin-bottom:18px}

ul{margin:0 0 20px 25px}

li{margin-bottom:8px}

.highlight{background:#f8fafc;border-left:4px solid #4f46e5;padding:18px;margin:25px 0;border-radius:6px}

.warning{background:#fff7ed;border-left:4px solid #ea580c;padding:18px;margin:28px 0;border-radius:6px}

.related{margin-top:40px;padding-top:30px;border-top:1px solid #e5e7eb}

.related a{color:#4338ca;text-decoration:none}

.related a:hover{text-decoration:underline}

footer{text-align:center;padding:30px 20px;color:#64748b;font-size:14px}



@media(max-width:700px){

.header-wrap{flex-direction:column;align-items:flex-start}

main{padding:25px 12px}

.article{padding:25px 20px}

h1{font-size:30px}

h2{font-size:24px}

}

.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;

}