:root{color-scheme:dark;font-family:ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,sans-serif;line-height:1.5}*{box-sizing:border-box;margin:0;padding:0}html,body,#root{min-height:100vh;background:#0a0a0a;color:#fafafa;overflow:hidden}.pulse-app{width:100vw;height:100vh;position:relative;transition:background .3s ease}.menu-screen{position:absolute;top:0;right:0;bottom:0;left:0;display:flex;align-items:center;justify-content:center}.menu-content{text-align:center}.game-title{font-size:4rem;font-weight:800;letter-spacing:.15em;background:linear-gradient(135deg,#a78bfa,#60a5fa,#34d399);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;margin-bottom:.5rem}.game-subtitle{color:#ffffff73;font-size:1rem;margin-bottom:.75rem}.high-score{color:#ffffff59;font-size:.85rem;margin-bottom:2rem;font-variant-numeric:tabular-nums}.play-btn{background:linear-gradient(135deg,#7c3aed,#3b82f6);border:none;color:#fff;font-size:1.1rem;font-weight:600;padding:.85rem 3rem;border-radius:999px;cursor:pointer;letter-spacing:.05em;transition:transform .15s,box-shadow .15s;margin-bottom:2.5rem}.play-btn:hover{transform:scale(1.05);box-shadow:0 0 30px #7c3aed66}.play-btn:active{transform:scale(.97)}.instructions{display:flex;flex-direction:column;gap:.5rem;font-size:.85rem;color:#ffffff80}.inst-row{display:flex;align-items:center;gap:.6rem;justify-content:center}.inst-dot{width:10px;height:10px;border-radius:50%}.inst-dot.perfect{background:#facc15}.inst-dot.great{background:#4ade80}.inst-dot.good{background:#60a5fa}.game-canvas{position:absolute;top:0;right:0;bottom:0;left:0;cursor:crosshair}.hud{position:absolute;top:0;left:0;right:0;display:flex;justify-content:space-between;align-items:flex-start;padding:1.25rem 1.5rem;pointer-events:none;z-index:10}.hud-score{font-size:1.5rem;font-weight:700;font-variant-numeric:tabular-nums;color:#ffffffe6}.hud-combo{font-size:.85rem;font-weight:600;color:#a78bfa;margin-top:.15rem}.hud-right{display:flex;gap:.4rem}.life-pip{width:12px;height:12px;border-radius:50%;transition:background .2s,opacity .2s}.life-pip.alive{background:#f87171;box-shadow:0 0 6px #f8717180}.life-pip.dead{background:#ffffff1a}.over-screen{position:absolute;top:0;right:0;bottom:0;left:0;display:flex;align-items:center;justify-content:center;background:#0a0a0ad9;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px)}.over-content{text-align:center}.grade{font-size:6rem;font-weight:900;line-height:1;margin-bottom:.5rem}.grade[data-grade=S]{color:#facc15;text-shadow:0 0 40px rgba(250,204,21,.5)}.grade[data-grade=A]{color:#4ade80}.grade[data-grade=B]{color:#60a5fa}.grade[data-grade=C]{color:#fb923c}.grade[data-grade=D]{color:#f87171}.final-score{font-size:2.5rem;font-weight:700;font-variant-numeric:tabular-nums;margin-bottom:.25rem}.new-best{color:#facc15;font-size:1rem;font-weight:600;margin-bottom:1rem}.over-stats{display:flex;gap:2rem;justify-content:center;margin-bottom:2rem}.stat{display:flex;flex-direction:column;align-items:center}.stat-num{font-size:1.4rem;font-weight:700;font-variant-numeric:tabular-nums}.stat-label{font-size:.75rem;color:#fff6;text-transform:uppercase;letter-spacing:.1em}