:root{--bg: #0e1020;--panel: #171a30;--ink: #e8ecff;--accent: #ffcb3d;--mouse: #6fd3ff}*{box-sizing:border-box}html,body{margin:0;height:100%;background:var(--bg);color:var(--ink);font-family:Segoe UI,system-ui,sans-serif;-webkit-user-select:none;user-select:none}#app{display:flex;flex-direction:column;align-items:center;gap:10px;padding:12px}.hud{display:flex;gap:18px;flex-wrap:wrap;align-items:center;font-size:15px;letter-spacing:.5px}.hud b{color:var(--accent)}.bouncebar{display:inline-flex;align-items:center;gap:6px}.bouncemeter{display:inline-block;width:90px;height:10px;background:#2a2f55;border-radius:5px;overflow:hidden;vertical-align:middle}.bouncemeter>span{display:block;height:100%;width:100%;background:#5ad36f;transition:width .08s linear,background .15s linear}canvas{background:#05060f;border:2px solid #2a2f55;border-radius:8px;max-width:100%;height:auto;image-rendering:pixelated;touch-action:none}.controls{display:flex;gap:10px;align-items:center;flex-wrap:wrap}button.diff{background:var(--panel);color:var(--ink);border:1px solid #2a2f55;border-radius:6px;padding:6px 12px;cursor:pointer;font-size:14px}button.diff.active{background:var(--accent);color:#1a1400;font-weight:700}.hint{font-size:12px;opacity:.7;text-align:center;max-width:640px}.banner{font-size:20px;font-weight:700;color:var(--accent);min-height:24px}