:root{--nka-navy:#0B1F33;--nka-blue:#1677FF;--nka-bg:#F5F7FA;--nka-surface:#fff;--nka-border:#DDE3EA;--nka-muted:#667085;--nka-radius:12px;--nka-shadow:0 8px 24px rgba(11,31,51,.06)}
*{box-sizing:border-box}.nka-site-header{background:#fff;border-bottom:1px solid var(--nka-border);position:sticky;top:0;z-index:30}.nka-site-header__inner{min-height:68px}.nka-brand a{font-weight:800;color:var(--nka-navy)}.nka-main{padding:32px 20px 64px}.nka-site-footer{border-top:1px solid var(--nka-border);background:#fff;padding:28px 20px;color:var(--nka-muted)}
.nka-card{background:var(--nka-surface);border:1px solid var(--nka-border);border-radius:var(--nka-radius);box-shadow:var(--nka-shadow);padding:28px;margin:0 0 24px}.nka-content-card{max-width:860px}.nka-course-hero{background:linear-gradient(135deg,#fff,#f0f6ff)}
.nka-shell{display:grid;grid-template-columns:260px minmax(0,1fr);gap:24px}.nka-sidebar{background:#fff;border:1px solid var(--nka-border);border-radius:12px;padding:18px;align-self:start;position:sticky;top:92px}.nka-sidebar a{display:block;padding:10px 12px;border-radius:8px;color:#344054}.nka-sidebar a:hover,.nka-sidebar a.is-active{background:#EEF5FF;color:#0D62D6}.nka-stat-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}.nka-stat{background:#fff;border:1px solid var(--nka-border);border-radius:10px;padding:18px}.nka-stat strong{display:block;font-size:1.5rem;color:var(--nka-navy)}
.nka-progress{height:10px;background:#E9EEF5;border-radius:99px;overflow:hidden}.nka-progress>span{display:block;height:100%;background:var(--nka-blue)}.nka-button,.nka-exam button{display:inline-flex;align-items:center;justify-content:center;border:0;border-radius:10px;background:var(--nka-blue);color:#fff;font-weight:700;padding:11px 18px;cursor:pointer}.nka-button--secondary{background:#fff;color:var(--nka-navy);border:1px solid var(--nka-border)}
.nka-exam-question{background:#fff;border:1px solid var(--nka-border);border-radius:12px;padding:22px;margin:0 0 18px}.nka-exam-option{display:block;border:1px solid var(--nka-border);border-radius:9px;padding:12px;margin:8px 0;cursor:pointer}.nka-exam-option:hover{border-color:#97BDFC;background:#F7FAFF}.nka-result-pass{color:#116B4C}.nka-result-fail{color:#B42318}.nka-muted{color:var(--nka-muted)}
@media(max-width:820px){.nka-main{padding:20px 14px 48px}.nka-shell{grid-template-columns:1fr}.nka-sidebar{position:static}.nka-stat-grid{grid-template-columns:1fr}.nka-card{padding:20px}.nka-site-header{position:relative}}