.kb-search{display:block;max-width:640px;margin:0 0 36px}
.kb-search input{width:100%;box-sizing:border-box;height:52px;padding:0 18px;font:inherit;font-size:16px;border:1px solid #d5dde9;border-radius:14px;background:#fff;color:#0f1a2e}
.kb-search input:focus{outline:2px solid #3b82f6;outline-offset:1px;border-color:#3b82f6}
.kb-group{margin:0 0 40px}
.kb-group[hidden],.kb-card[hidden]{display:none}
.kb-group h2{margin:0 0 16px}
.kb-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;align-items:stretch}
.kb-card{display:flex;flex-direction:column;gap:8px;height:100%;box-sizing:border-box;padding:20px;border:1px solid #e3e9f2;border-radius:16px;background:#fff;color:#0f1a2e;text-decoration:none;transition:border-color .2s,box-shadow .2s}
.kb-card:hover{border-color:#3b82f6;box-shadow:0 8px 24px rgba(15,26,46,.08)}
.kb-card strong{font-size:17px;line-height:1.35}
.kb-card span{font-size:15px;line-height:1.5;color:#4a5668}
.kb-empty{font-size:16px}
.kb-back{margin-top:32px}
@media (max-width:1000px){.kb-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (max-width:640px){.kb-grid{grid-template-columns:minmax(0,1fr)}}