.main-header{position:fixed;top:0;left:0;width:100%;background:var(--bg-primary);border-bottom:2px solid var(--border-color);z-index:1000;transition:var(--transition)}.navbar{display:flex;justify-content:space-between;align-items:center;padding:1rem 1.25rem;width:100%}.logo{display:flex;align-items:center;gap:.5rem;font-size:clamp(1.125rem, 5vw, 1.5rem);font-weight:800;text-transform:uppercase;letter-spacing:-.02em}.logo-icon{font-size:clamp(1.125rem, 5vw, 1.5rem);color:var(--accent)}.logo-text{color:var(--text-primary)}.logo-text span{color:var(--accent)}.nav-actions{display:flex;align-items:center;gap:.75rem}.theme-toggle{background:0 0;border:2px solid var(--border-color);font-size:clamp(1rem, 4vw, 1.25rem);cursor:pointer;color:var(--text-primary);padding:.5rem;transition:var(--transition);display:flex;align-items:center;justify-content:center;box-shadow:var(--shadow)}.theme-toggle:hover{transform:translate(-2px,-2px);box-shadow:var(--shadow-hover)}