/* ============================================
   HEADER
   ============================================ */
.header{position:sticky;top:0;z-index:100;background:color-mix(in srgb,var(--bg) 85%,transparent);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--border);transition:all .3s}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:72px;gap:1.5rem}
.logo{display:flex;align-items:center;gap:.6rem;font-weight:800;font-size:1.4rem;letter-spacing:-.02em}
.logo-mark{width:40px;height:40px;background:linear-gradient(135deg,var(--primary),var(--accent));border-radius:10px;display:grid;place-items:center;color:#fff;font-weight:900;font-size:1.3rem;box-shadow:var(--shadow)}
.logo-text span{background:linear-gradient(135deg,var(--primary),var(--accent));-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.nav{display:flex;align-items:center;gap:.5rem}
.nav a{padding:.6rem 1rem;border-radius:8px;font-weight:500;font-size:.95rem;color:var(--text-muted);transition:all .2s}
.nav a:hover,.nav a.active{color:var(--text);background:var(--bg-alt)}
.header-actions{display:flex;align-items:center;gap:.5rem}
.icon-btn{width:40px;height:40px;border-radius:10px;display:grid;place-items:center;color:var(--text-muted);transition:all .2s}
.icon-btn:hover{background:var(--bg-alt);color:var(--text)}
.search-toggle{display:none}
.hamburger-btn{display:none}

/* Mobile nav */
.mobile-nav{display:none;flex-direction:column;padding:1rem;background:var(--bg);border-top:1px solid var(--border)}
.mobile-nav.active{display:flex}
.mobile-nav a{padding:.75rem 1rem;border-radius:8px;color:var(--text-muted);font-weight:500;transition:all .2s}
.mobile-nav a:hover{background:var(--bg-alt);color:var(--text)}