.app-header{background:var(--gradient-primary);color:white;padding:1rem 2rem;justify-content:space-between;box-shadow:var(--shadow-md);z-index:100}.app-header,.header-left{display:flex;align-items:center}.app-title{font-size:1.75rem;font-weight:700;margin:0}.header-right{display:flex;align-items:center;gap:1.5rem}.user-name{font-size:.95rem;font-weight:500}.btn-logout{background-color:rgba(255,255,255,.15);color:white;border:1px solid rgba(255,255,255,.25);padding:.5rem 1.25rem;border-radius:var(--radius-sm);cursor:pointer;font-size:.9rem;font-weight:500;transition:all .2s}.btn-logout:hover{background-color:rgba(255,255,255,.25);transform:translateY(-1px)}