*{box-sizing:border-box}body{background:#f5f7fb;margin:0;font-family:Arial,sans-serif}.app-shell{max-width:480px;min-height:100vh;margin:auto}.topbar{background:#fff;justify-content:space-between;align-items:center;padding:16px;display:flex}.content{padding:16px}.card,.balance-card{background:#fff;border-radius:12px;margin-bottom:16px;padding:16px}.balance{font-size:28px;font-weight:700}.bottom-nav{background:#fff;border-top:1px solid #ddd;display:flex;position:fixed;bottom:0;left:0;right:0}.bottom-nav button{flex:1;padding:12px}.bottom-nav .active{font-weight:700}input{width:100%;margin:8px 0;padding:10px}.actions{gap:8px;display:flex}.primary,.ghost{padding:10px}.txn{justify-content:space-between;margin:8px 0;display:flex}.credit{color:green}.debit{color:red}.muted{color:#666}