.site-header{position:fixed;top:0;left:0;right:0;z-index:1000;background:rgba(13,13,18,.85);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--border);height:var(--nav-h)}
.nav{display:flex;align-items:center;gap:2rem;height:100%}
.nav-logo{display:flex;align-items:center;gap:.5rem;font-weight:700;font-size:1.1rem}
.logo-dot{width:8px;height:8px;border-radius:50%;background:var(--accent);display:block}
.nav-links{display:flex;gap:.25rem;list-style:none;margin-left:auto}
.nav-link{padding:.5rem 1rem;border-radius:var(--radius-sm);font-size:.88rem;font-weight:500;color:var(--text-2);transition:all var(--transition)}
.nav-link:hover,.nav-link.active{color:var(--text);background:var(--surface)}
.nav-actions{display:flex;align-items:center;gap:.5rem}
.theme-toggle{display:flex;align-items:center;justify-content:center;width:38px;height:38px;border-radius:var(--radius-sm);color:var(--text-2);transition:all var(--transition)}
.theme-toggle:hover{color:var(--text);background:var(--surface)}
.icon-sun,.icon-moon{position:absolute;transition:opacity .25s,transform .25s}
[data-theme="dark"] .icon-sun,[data-theme="light"] .icon-moon{opacity:1;transform:rotate(0)}
[data-theme="dark"] .icon-moon,[data-theme="light"] .icon-sun{opacity:0;transform:rotate(90deg)}
.nav-toggle{display:none;flex-direction:column;gap:4px;padding:8px;border-radius:var(--radius-sm)}
.nav-toggle span{display:block;width:20px;height:2px;background:var(--text);border-radius:2px;transition:all .3s}
.nav-toggle.open span:nth-child(1){transform:rotate(45deg) translate(4px,4px)}
.nav-toggle.open span:nth-child(2){opacity:0}
.nav-toggle.open span:nth-child(3){transform:rotate(-45deg) translate(4px,-4px)}
#nav-overlay{display:none;position:fixed;inset:0;z-index:999;background:rgba(10,0,0,.8);backdrop-filter:blur(4px)}
#nav-overlay.open{display:block}
@media(max-width:768px){
  .nav-links{position:fixed;top:0;right:-320px;width:300px;height:100vh;flex-direction:column;background:linear-gradient(180deg,#0d0202 0%,#1a0404 40%,#0d0202 100%);border-left:2px solid rgba(200,40,0,.3);padding:5rem 1.5rem 2rem;transition:right .35s cubic-bezier(.22,1,.36,1);z-index:1000;overflow-y:auto;box-shadow:-8px 0 40px rgba(200,20,0,.15)}
  .nav-links::before{content:'CIRCLES';display:block;font-size:.55rem;font-weight:800;letter-spacing:.3em;color:rgba(220,50,20,.35);margin-bottom:.25rem;text-align:center;text-transform:uppercase}
  .nav-links::after{content:'';display:block;height:1px;background:linear-gradient(90deg,transparent,rgba(220,50,20,.25),transparent);margin-bottom:1.25rem}
  .nav-links.open{right:0}
  .nav-links li{position:relative;margin-bottom:.15rem}
  .nav-link{display:flex;align-items:center;gap:.6rem;padding:.7rem .85rem;border-radius:6px;font-size:.85rem;font-weight:500;color:rgba(232,232,240,.5);transition:all .25s ease;position:relative;overflow:hidden}
  .nav-link::before{content:attr(data-circle);font-size:.6rem;font-weight:700;color:rgba(200,40,0,.3);width:20px;text-align:right;flex-shrink:0;font-family:var(--mono)}
  .nav-link:hover,.nav-link.active{color:#fff;background:linear-gradient(135deg,rgba(200,40,0,.12),transparent);transform:translateX(-3px)}
  .nav-link:hover::before,.nav-link.active::before{color:rgba(255,80,20,.7)}
  .nav-link::after{content:'';position:absolute;left:0;top:4px;width:2px;height:calc(100% - 8px);background:linear-gradient(to bottom,rgba(255,60,0,.4),transparent);opacity:0;transition:opacity .25s;border-radius:0 2px 2px 0}
  .nav-link:hover::after,.nav-link.active::after{opacity:1}
  .nav-toggle{display:flex}
}