:root{font-family:Inter,system-ui,Avenir,Helvetica,Arial,sans-serif;line-height:1.5;font-weight:400;color-scheme:dark;color:#ffffffde;background-color:#000}*{box-sizing:border-box}body{margin:0;padding:0;width:100vw;height:100vh;padding:env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left);overflow:hidden;background-color:#000;display:flex;justify-content:center;align-items:center;user-select:none;-webkit-user-select:none;-webkit-touch-callout:none;touch-action:none}#root{width:100%;height:100%}canvas{display:block;width:100%;height:100%}.sound-toggle-btn{position:absolute;top:env(safe-area-inset-top,20px);right:env(safe-area-inset-right,20px);background:#00000080;color:#0ff;border:1px solid #00FFFF;padding:8px 16px;border-radius:4px;font-family:inherit;font-weight:700;font-size:.9rem;cursor:pointer;z-index:1000;backdrop-filter:blur(4px);-webkit-backdrop-filter:blur(4px);transition:all .3s ease;box-shadow:0 0 10px #0ff3}.sound-toggle-btn:hover{background:#00ffff1a;box-shadow:0 0 15px #0ff6}.sound-toggle-btn.muted{color:#888;border-color:#555;box-shadow:none}.sound-toggle-btn.muted:hover{background:#ffffff1a}.hud{position:absolute;top:env(safe-area-inset-top,20px);left:env(safe-area-inset-left,20px);pointer-events:none;z-index:10;display:flex;flex-direction:column;gap:10px}.score{font-size:2rem;font-weight:800;color:#0ff;text-shadow:0 0 10px #00FFFF,0 0 20px #00FFFF;letter-spacing:2px}.overdrive-container{width:250px;height:15px;background-color:#ffffff1a;border:1px solid rgba(255,255,255,.3);margin-top:5px;position:relative;overflow:hidden}.overdrive-bar{height:100%;background-color:#0ff;transition:width .1s linear,background-color .3s ease}.overdrive-bar.ready{background-color:#9d00ff;box-shadow:0 0 15px #9d00ff;animation:overdrivePulse .5s infinite alternate}.overdrive-label{position:absolute;top:-20px;left:0;font-size:.8rem;color:#fff;letter-spacing:1px}.overdrive-trigger-btn{position:fixed;bottom:15%;left:50%;transform:translate(-50%);padding:12px 24px;font-size:1.2rem;font-weight:700;color:#fff;background:#9d00ff4d;border:2px solid #9D00FF;border-radius:5px;text-shadow:0 0 10px #9D00FF;box-shadow:0 0 20px #9d00ff99;cursor:pointer;z-index:100;animation:btnPulse .5s infinite alternate;pointer-events:auto}@keyframes overdrivePulse{0%{opacity:.8}to{opacity:1}}@keyframes btnPulse{0%{transform:translate(-50%) scale(1);box-shadow:0 0 20px #9d00ff99}to{transform:translate(-50%) scale(1.05);box-shadow:0 0 40px #9d00ff}}.combo{font-size:1.5rem;font-weight:800;color:#f05;text-shadow:0 0 10px #FF0055,0 0 20px #FF0055;animation:pop .3s cubic-bezier(.175,.885,.32,1.275) forwards}@keyframes pop{0%{transform:scale(.5);opacity:0}to{transform:scale(1);opacity:1}}.level-up-anim{position:fixed;top:30%;left:50%;transform:translate(-50%,-50%);font-size:min(3.5rem,8vw);font-weight:900;color:#39ff14;text-shadow:0 0 20px #39FF14,0 0 40px #39FF14;letter-spacing:2px;pointer-events:none;opacity:0;animation:levelUpFade 2.5s cubic-bezier(.175,.885,.32,1.275) forwards;z-index:50;white-space:nowrap}@keyframes levelUpFade{0%{transform:translate(-50%,-40%) scale(.5);opacity:0}10%{transform:translate(-50%,-50%) scale(1.2);opacity:1}20%{transform:translate(-50%,-50%) scale(1);opacity:1}80%{transform:translate(-50%,-50%) scale(1);opacity:1}to{transform:translate(-50%,-60%) scale(1.5);opacity:0}}.overlay{position:absolute;top:0;left:0;width:100%;height:100%;display:flex;flex-direction:column;justify-content:center;align-items:center;background-color:#000000d9;z-index:20;text-align:center;pointer-events:auto}.title-logo-container{display:flex;flex-direction:column;align-items:center;margin-bottom:40px;position:relative}.title-main{font-size:3.5rem;font-weight:900;color:#0ff;margin:0;line-height:1.1;text-transform:uppercase;text-shadow:0 0 10px rgba(0,255,255,.8),2px 2px 5px rgba(0,0,0,.5);letter-spacing:6px;position:relative}.title-highlight{font-size:4rem;color:transparent;background:linear-gradient(90deg,#f0f,#0ff);-webkit-background-clip:text;background-clip:text;text-shadow:none;filter:drop-shadow(0 0 10px rgba(255,0,255,.6)) drop-shadow(0 0 20px rgba(0,255,255,.6))}.title-glitch{position:absolute;top:0;left:0;text-shadow:-2px 0 #FF0000,2px 0 #0000FF;background:transparent;color:#fff;opacity:.7;pointer-events:none;animation:glitch-anim 2.5s infinite linear alternate-reverse}.title-sub{font-size:1.2rem;color:#fff;letter-spacing:12px;margin:15px 0 0;text-shadow:0 0 10px rgba(255,255,255,.8),0 0 20px rgba(0,255,255,.5);font-weight:700;opacity:.9}@keyframes glitch-anim{0%{clip-path:inset(10% 0 80% 0);transform:translate(-3px,2px)}5%{clip-path:inset(50% 0 30% 0);transform:translate(3px,-2px)}10%{clip-path:inset(20% 0 10% 0);transform:translate(0)}15%{clip-path:inset(80% 0 5% 0);transform:translate(-3px)}20%{clip-path:inset(100% 0 0% 0);transform:translate(0)}to{clip-path:inset(100% 0 0% 0);transform:translate(0)}}.result{font-size:1.5rem;margin:30px 0;color:#39ff14;text-shadow:0 0 10px #39FF14}.result p{margin:10px 0}.new-recordblink{color:#ff0;text-shadow:0 0 10px #FFFF00,0 0 20px #FF9900;animation:overdrivePulse .5s infinite alternate}.ranking-board{background:#001428b3;border:1px solid rgba(0,255,255,.5);border-radius:8px;padding:15px 25px;margin:20px auto;min-width:280px;box-shadow:0 0 15px #0ff3}.ranking-board h3{margin:0 0 15px;font-size:1.2rem;color:#0ff;letter-spacing:2px;text-shadow:0 0 5px #00FFFF;border-bottom:1px solid rgba(0,255,255,.3);padding-bottom:5px}.ranking-board table{width:100%;border-collapse:collapse}.ranking-board td{padding:5px 10px;font-size:1rem}.rank-idx{color:#aaa;text-align:left}.rank-score{font-weight:700;color:#fff;text-align:right;letter-spacing:1px}.rank-level,.rank-date{color:#0ff;opacity:.8;font-size:.8rem;text-align:right}.new-entry td{color:#ff0;text-shadow:0 0 5px #FFFF00;animation:blink 1s infinite alternate}.title-ranking{margin-top:40px}.gameover-ranking{margin-top:10px;margin-bottom:30px}.start-btn{background:transparent;color:#fff;border:2px solid #00FFFF;padding:15px 30px;font-size:1.2rem;font-weight:700;font-family:inherit;letter-spacing:2px;cursor:pointer;box-shadow:0 0 15px #00ffff4d,inset 0 0 10px #00ffff4d;transition:all .2s ease}.start-btn:hover{background:#0ff3;box-shadow:0 0 25px #0ff9,inset 0 0 15px #0ff9;transform:scale(1.05)}.start-btn:active{transform:scale(.95)}.status{font-size:1.2rem;font-weight:600;color:#fff;opacity:.9}.overlay-demo{background-color:#0006;backdrop-filter:blur(4px);-webkit-backdrop-filter:blur(4px)}.title-buttons{display:flex;gap:20px;flex-wrap:wrap;justify-content:center;align-items:center}.how-to-play-btn,.close-btn{background:transparent;color:#fff;border:1px solid rgba(255,255,255,.5);padding:15px 30px;font-size:1rem;font-weight:700;font-family:inherit;letter-spacing:2px;cursor:pointer;transition:all .2s ease}.how-to-play-btn:hover,.close-btn:hover{background:#ffffff1a;border-color:#fff;box-shadow:0 0 15px #ffffff4d}.return-title-btn{border-color:#ff005580}.return-title-btn:hover{background:#f053;border-color:#f05;box-shadow:0 0 15px #ff005580}.overlay-tutorial{background-color:#000000d9;backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px)}.tutorial-modal{background:#001428d9;border:1px solid #00FFFF;border-radius:8px;padding:30px;max-width:800px;width:90%;max-height:85vh;overflow-y:auto;box-shadow:0 0 30px #0ff3;display:flex;flex-direction:column;gap:20px;align-items:center;text-align:left}.tutorial-modal h2{color:#0ff;margin:0;font-size:1.8rem;letter-spacing:3px;text-shadow:0 0 10px #00FFFF;border-bottom:1px solid rgba(0,255,255,.5);padding-bottom:10px;width:100%;text-align:center}.tutorial-content{width:100%;display:flex;flex-direction:column;gap:20px;color:#ffffffe6}.tutorial-section h3{color:#39ff14;font-size:1.2rem;margin:0 0 10px;letter-spacing:1px}.tutorial-section p{margin:0 0 10px;line-height:1.6}.tutorial-section ul{padding-left:20px;margin:0;line-height:1.6}.tutorial-section li{margin-bottom:8px}.enemy-name{font-weight:700}.enemy-name.minion,.enemy-name.floater{color:#fff}.enemy-name.tank{color:#ff0}.enemy-name.bomber{color:#9d00ff}.enemy-name.cloud{color:#0ff;text-shadow:0 0 5px #00FFFF}.enemy-name.twin{color:#f0f;text-shadow:0 0 5px #FF00FF}.tutorial-modal::-webkit-scrollbar{width:8px}.tutorial-modal::-webkit-scrollbar-track{background:#00ffff0d;border-radius:4px}.tutorial-modal::-webkit-scrollbar-thumb{background:#00ffff4d;border-radius:4px}.tutorial-modal::-webkit-scrollbar-thumb:hover{background:#0ff9}