:root{--bg: #121212;--fg: #eee;--accent: #ffd600}*{box-sizing:border-box;margin:0;padding:0}body,.app{background:var(--bg);color:var(--fg);font-family:sans-serif;height:100vh;display:flex;flex-direction:column}.header{display:flex;justify-content:space-between;align-items:center;padding:.75rem 1.5rem;background:#1e1e1e;box-shadow:0 2px 4px #00000080}.logo{font-size:1.25rem;font-weight:700}.header-actions{display:flex;align-items:center;gap:.5rem}.wallet-dropdown{background:#222;border:1px solid #444;color:var(--fg);padding:.4rem .6rem;border-radius:4px;cursor:pointer}.btn{background:var(--accent);border:none;color:#000;padding:.5rem 1rem;border-radius:4px;cursor:pointer;font-weight:700;transition:background .2s}.btn:hover{background:#ffe000}.btn-logout{background:#e53935;color:#fff}.btn-logout:hover{background:#f05545}.block-container{flex:1;display:flex;flex-wrap:wrap;padding:1rem;gap:.5rem;align-content:flex-start}.cube{width:40px;height:40px;background:var(--accent);border-radius:4px;transition:transform .1s,box-shadow .2s;position:relative}.cube:hover{transform:scale(1.1);box-shadow:0 0 8px #ffffff80}.cube.pending{background:var(--accent);cursor:default}.cube.success{background:#4caf50;cursor:pointer}.cube.failed{background:#f44336;cursor:help}.cube.failed:after{content:attr(data-error);position:absolute;top:-1.8rem;left:50%;transform:translate(-50%);background:#000c;color:#fff;padding:.2rem .4rem;border-radius:4px;white-space:nowrap;font-size:.75rem;opacity:0;pointer-events:none;transition:opacity .1s}.cube.failed:hover:after{opacity:1}.modal-backdrop{position:fixed;top:0;left:0;width:100%;height:100%;background:#000000bf;display:flex;align-items:center;justify-content:center}.modal{background:#222;padding:1.5rem;border-radius:8px;width:300px;text-align:center}.modal input{width:100%;padding:.5rem;margin:1rem 0;background:#333;border:1px solid #444;color:#fff}.modal-actions{display:flex;justify-content:space-around}.modal-actions button{padding:.5rem 1rem;border:none;background:var(--accent);color:#000;font-weight:700;cursor:pointer}.block-container.disabled{pointer-events:none;opacity:.5}.game-over{position:fixed;top:50%;left:50%;transform:translate(-50%,-50%);background:#1e1e1ee6;padding:1.5rem 2rem;border-radius:8px;text-align:center;z-index:10}.game-over p{margin-bottom:1rem;font-size:1.1rem}