.site-header{position:sticky;top:0;z-index:50;background:rgba(20,24,32,.6);backdrop-filter: blur(10px);border-bottom:1px solid rgba(255,255,255,.08)}
.site-header .nav{display:flex;align-items:center;justify-content:space-between;padding:12px 0}
.brand{display:flex;align-items:center;gap:10px;font-weight:900;color:var(--text)}
.brand img{filter:drop-shadow(0 6px 24px color-mix(in srgb, var(--accent) 40%, transparent))}
.menu{display:flex;gap:16px;align-items:center}
.menu a{padding:8px 10px;border-radius:10px;color:#E5E7EB}
.menu .btn{margin-left:4px}
#nav-toggle{display:none}
.burger{display:none;cursor:pointer}
.burger span{display:block;width:24px;height:2px;background:#E5E7EB;margin:5px 0;border-radius:2px}
@media(max-width:760px){
  .burger{display:block}
  .menu{position:absolute;top:64px;right:4%;background:rgba(20,24,32,.95);padding:12px;border-radius:12px;box-shadow:var(--shadow);display:none;flex-direction:column;min-width:240px;border:1px solid rgba(255,255,255,.08)}
  #nav-toggle:checked ~ .menu{display:flex}
}
.diag{background:linear-gradient(135deg, color-mix(in srgb, var(--secondary) 15%, var(--surface)), var(--surface));border-top:1px solid rgba(255,255,255,.06);border-bottom:1px solid rgba(255,255,255,.06);color:#E8EEF8;padding:56px 0}
.quote{position:relative}
.quote:before{content:'“';position:absolute;left:6px;top:-6px;font-size:42px;color:var(--muted);opacity:.25}