:root{--bg: #070a10;--cyan: #00e5ff;--amber: #ffd600;--crimson: #f43f5e;--font-tech: "Rajdhani", sans-serif;--font-display: "Orbitron", sans-serif}*{box-sizing:border-box;margin:0;padding:0;user-select:none}html,body{width:100vw;height:100vh;background-color:var(--bg);overflow:hidden;font-family:var(--font-tech);color:#fff}#app{position:relative;width:100vw;height:100vh}#game-canvas{position:absolute;top:0;left:0;width:100%;height:100%;display:block}.scanlines{position:absolute;inset:0;background:linear-gradient(#12101000 50%,#00000040 50%);background-size:100% 4px;pointer-events:none;opacity:.35;z-index:10}.vignette{position:absolute;inset:0;box-shadow:inset 0 0 100px #000000b3;pointer-events:none;z-index:11}.top-controls{position:absolute;top:20px;right:24px;z-index:20;display:flex;gap:12px}.hud-btn{background:#0f172ad9;border:1px solid rgba(255,255,255,.15);color:#cbd5e1;padding:8px 14px;border-radius:6px;font-size:12px;font-weight:700;font-family:var(--font-tech);letter-spacing:.08em;text-transform:uppercase;cursor:pointer;transition:background .15s ease,border-color .15s ease,color .15s ease}.hud-btn:hover{background:#00e5ff26;border-color:var(--cyan);color:#fff}