body{
  background:#f4f7fb;
  font-family:Arial, Helvetica, sans-serif;
}

.knowledge-page{
  max-width:1280px;
  margin:0 auto;
  padding:20px 15px;
}

.breadcrumb{
  color:#4b5563;
  font-size:14px;
  margin:12px 0 20px;
}

.knowledge-hero h1{
  color:#002b5c;
  font-size:34px;
  margin-bottom:8px;
}

.knowledge-hero p{
  color:#4b5563;
  font-size:16px;
}

.knowledge-hero:after{
  content:"";
  display:block;
  width:70px;
  height:4px;
  background:#e60012;
  margin-top:18px;
}

.knowledge-layout{
  display:grid;
  grid-template-columns:260px 1fr 300px;
  gap:22px;
  align-items:start;
}

.side-box,
.consult-box,
.support-box,
.article-toolbar,
.article-card{
  background:#fff;
  border:1px solid #e5e7eb;
  border-radius:8px;
  overflow:hidden;
  box-shadow:0 2px 8px rgba(0,0,0,.04);
}

.side-box h3{
  background:#004b93;
  color:#fff;
  padding:12px 14px;
  margin:0;
  font-size:16px;
}

.side-box button{
  width:100%;
  display:block;
  background:#fff;
  border:0;
  border-bottom:1px solid #e5e7eb;
  padding:13px 14px;
  text-align:left;
  cursor:pointer;
  color:#1f2937;
  font-size:15px;
}

.side-box button:hover{
  background:#eef5ff;
  color:#004b93;
}

.consult-box,
.support-box{
  margin-top:22px;
  padding:22px;
  text-align:center;
  border:1px solid #ffd2d2;
  border-radius:8px;
  background:#fffafa;
}

.consult-box h3,
.support-box h3{
  color:#e60012;
  margin-top:0;
}

.consult-box a,
.support-box a{
  display:block;
  margin-top:15px;
  background:#e60012;
  color:#fff;
  padding:13px;
  border-radius:8px;
  text-decoration:none;
  font-size:20px;
  font-weight:700;
}

.article-toolbar{
  display:flex;
  justify-content:space-between;
  align-items:center;
  padding:13px 16px;
  margin-bottom:16px;
}

.article-toolbar button{
  border:0;
  background:#fff;
  color:#004b93;
  margin-left:12px;
  cursor:pointer;
  font-weight:700;
}

.article-toolbar button:hover{
  color:#e60012;
}

.article-card{
  display:grid;
  grid-template-columns:250px 1fr;
  gap:18px;
  padding:16px;
  margin-bottom:16px;
}

.article-card img{
  width:100%;
  height:145px;
  object-fit:cover;
  border-radius:6px;
  background:#f3f4f6;
}

.article-card h2{
  font-size:22px;
  margin:2px 0 10px;
  line-height:1.35;
}

.article-card h2 a{
  color:#003b73;
  text-decoration:none;
}

.article-card h2 a:hover{
  color:#e60012;
}

.article-card p{
  color:#374151;
  line-height:1.55;
  margin-bottom:14px;
}

.article-meta{
  display:flex;
  gap:18px;
  flex-wrap:wrap;
  color:#6b7280;
  font-size:14px;
}

.popular-item{
  display:grid;
  grid-template-columns:28px 68px 1fr;
  gap:10px;
  padding:12px;
  border-bottom:1px solid #e5e7eb;
  align-items:center;
}

.popular-item span{
  background:#e60012;
  color:#fff;
  width:24px;
  height:24px;
  border-radius:50%;
  display:flex;
  align-items:center;
  justify-content:center;
  font-size:13px;
  font-weight:700;
}

.popular-item img{
  width:68px;
  height:48px;
  object-fit:cover;
  border-radius:4px;
}

.popular-item a{
  color:#003b73;
  font-weight:700;
  text-decoration:none;
  font-size:14px;
  line-height:1.35;
}

.tag-cloud{
  padding:14px;
  display:flex;
  flex-wrap:wrap;
  gap:9px;
}

.tag-cloud a{
  text-decoration:none;
  color:#1f2937;
  background:#f3f6fb;
  border:1px solid #e5e7eb;
  padding:8px 11px;
  border-radius:5px;
  font-size:14px;
}

.tag-cloud a:hover{
  background:#004b93;
  color:#fff;
}

.menu a.active{
  background:#e60012;
  color:#fff;
}

@media(max-width:1050px){
  .knowledge-layout{
    grid-template-columns:1fr;
  }
}

@media(max-width:700px){
  .article-card{
    grid-template-columns:1fr;
  }

  .article-toolbar{
    display:block;
  }

  .article-toolbar button{
    margin:10px 10px 0 0;
  }

  .knowledge-hero h1{
    font-size:26px;
  }
}
.topbar{
  background:#003b73;
  color:#fff;
  display:flex;
  justify-content:center;
  gap:50px;
  padding:8px 15px;
  font-size:14px;
}

.header{
  background:#fff;
  max-width:1280px;
  margin:0 auto;
  padding:22px 15px;
  display:grid;
  grid-template-columns:320px 1fr 210px;
  align-items:center;
  gap:25px;
}

.brand{
  display:flex;
  align-items:center;
  gap:14px;
}

.logo{
  font-size:48px;
  font-weight:900;
  color:#0056b3;
}

.brand h2{
  margin:0;
  color:#002b5c;
  font-size:20px;
  line-height:1.1;
}

.brand p{
  margin:5px 0 0;
  color:#4b5563;
}

.search{
  display:flex;
  height:46px;
  border:1px solid #d1d5db;
  border-radius:6px;
  overflow:hidden;
}

.search input{
  flex:1;
  border:0;
  padding:0 15px;
  outline:none;
}

.search button{
  width:56px;
  border:0;
  background:#e60012;
  color:#fff;
  font-size:20px;
}

.cart{
  text-align:center;
}

.cart strong{
  color:#e60012;
  font-size:22px;
}

.menu{
  background:#004b93;
  display:flex;
  justify-content:center;
  flex-wrap:wrap;
}

.menu a{
  color:#fff;
  text-decoration:none;
  padding:15px 20px;
  font-weight:700;
}

.menu a:hover,
.menu a.active{
  background:#e60012;
}

.footer{
  background:#003b73;
  color:#fff;
  display:grid;
  grid-template-columns:2fr 1.5fr 1fr;
  gap:30px;
  padding:35px max(20px, calc((100% - 1280px)/2));
  margin-top:30px;
}

.footer h3{
  margin-top:0;
  color:#fff;
}

.footer p{
  color:#e5e7eb;
  line-height:1.6;
}

@media(max-width:900px){
  .topbar,
  .header{
    display:block;
    text-align:center;
  }

  .search{
    margin:15px 0;
  }

  .footer{
    grid-template-columns:1fr;
    padding:25px 15px;
  }
}
.article-detail{
  background:#fff;
  border:1px solid #e5e7eb;
  border-radius:8px;
  padding:28px;
  line-height:1.7;
  color:#1f2937;
}

.article-detail h1{
  color:#003b73;
  font-size:32px;
  line-height:1.3;
  margin-top:0;
}

.article-detail h2{
  color:#003b73;
  margin-top:28px;
  border-left:5px solid #e60012;
  padding-left:12px;
}

.article-detail-meta{
  display:flex;
  gap:18px;
  flex-wrap:wrap;
  color:#6b7280;
  font-size:14px;
  margin:10px 0 20px;
}

.article-detail .lead{
  background:#f3f6fb;
  border-left:5px solid #004b93;
  padding:15px;
  font-weight:600;
}

.related-article-products{
  display:flex;
  gap:12px;
  flex-wrap:wrap;
  margin-top:12px;
}

.related-article-products a{
  background:#f3f6fb;
  border:1px solid #d1d5db;
  color:#003b73;
  text-decoration:none;
  padding:10px 14px;
  border-radius:6px;
  font-weight:700;
}

.article-cta{
  margin-top:30px;
  padding:22px;
  background:#fff5f5;
  border:1px solid #fecaca;
  border-radius:8px;
  text-align:center;
}

.article-cta h3{
  color:#e60012;
  margin-top:0;
}

.article-cta a{
  display:inline-block;
  background:#e60012;
  color:#fff;
  text-decoration:none;
  padding:12px 22px;
  border-radius:6px;
  font-weight:700;
}