:root{--color-primary: #3b82f6;--color-primary-light: #60a5fa;--color-primary-dark: #2563eb;--color-secondary: #f472b6;--color-success: #34d399;--color-warning: #fbbf24;--color-danger: #f87171;--color-bg: #0f172a;--color-bg-light: #1e293b;--color-text: #f1f5f9;--color-text-dim: #94a3b8;--font-main: "Nunito", "Segoe UI", system-ui, sans-serif;--shadow-glow: 0 0 20px rgba(59, 130, 246, .5)}*{margin:0;padding:0;box-sizing:border-box}body{font-family:var(--font-main);background:linear-gradient(135deg,var(--color-bg) 0%,#1a1a2e 100%);min-height:100vh;color:var(--color-text);overflow-x:hidden}body:before{content:"";position:fixed;top:0;left:0;width:100%;height:100%;background-image:radial-gradient(2px 2px at 20px 30px,white,transparent),radial-gradient(2px 2px at 40px 70px,rgba(255,255,255,.8),transparent),radial-gradient(1px 1px at 90px 40px,white,transparent),radial-gradient(2px 2px at 160px 120px,rgba(255,255,255,.9),transparent),radial-gradient(1px 1px at 230px 80px,white,transparent),radial-gradient(2px 2px at 300px 150px,rgba(255,255,255,.7),transparent);background-size:350px 200px;animation:twinkle 5s ease-in-out infinite;pointer-events:none;z-index:0}@keyframes twinkle{0%,to{opacity:1}50%{opacity:.7}}#app{position:relative;z-index:1;min-height:100vh}.screen{display:none;flex-direction:column;align-items:center;padding:20px;min-height:100vh;animation:fadeIn .3s ease}.screen.active{display:flex}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}.home-link{position:absolute;top:20px;left:20px;color:var(--color-primary-light);text-decoration:none;font-weight:600;padding:8px 12px;border-radius:8px;transition:background .2s}.home-link:hover{background:#3b82f633}.game-title{font-size:3.5rem;background:linear-gradient(135deg,var(--color-primary-light),var(--color-secondary));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;margin-bottom:10px;margin-top:40px}.subtitle{color:var(--color-text-dim);font-size:1.3rem;margin-bottom:40px}.difficulty-select{display:flex;flex-direction:column;gap:15px;width:100%;max-width:350px}.difficulty-select h2{text-align:center;color:var(--color-text);margin-bottom:10px}.difficulty-btn{display:flex;align-items:center;gap:15px;padding:20px;border:2px solid transparent;border-radius:16px;cursor:pointer;transition:all .2s ease;text-align:left;background:var(--color-bg-light);color:var(--color-text)}.difficulty-btn:hover{transform:translateY(-3px);box-shadow:var(--shadow-glow)}.difficulty-btn.easy{border-color:var(--color-success)}.difficulty-btn.easy:hover{background:#34d39933}.difficulty-btn.medium{border-color:var(--color-warning)}.difficulty-btn.medium:hover{background:#fbbf2433}.difficulty-btn.hard{border-color:var(--color-danger)}.difficulty-btn.hard:hover{background:#f8717133}.difficulty-btn .emoji{font-size:2.5rem}.difficulty-btn .label{font-size:1.5rem;font-weight:700;display:block}.difficulty-btn .desc{font-size:.9rem;color:var(--color-text-dim)}.stats-link{margin-top:40px;color:var(--color-primary-light);text-decoration:none;font-size:1.1rem;padding:10px 20px;border-radius:8px;transition:background .2s}.stats-link:hover{background:#3b82f633}#game-screen{padding:10px;gap:15px}.game-header{display:flex;justify-content:space-between;align-items:center;width:100%;max-width:500px;padding:10px;flex-wrap:wrap;gap:10px}#score-display{font-size:1.3rem;font-weight:700;color:var(--color-warning)}#streak-display{font-size:1.2rem;padding:5px 12px;background:var(--color-bg-light);border-radius:20px;transition:all .3s}#streak-display.active{background:linear-gradient(135deg,#f97316,#ef4444);animation:pulse .5s ease infinite}@keyframes pulse{0%,to{transform:scale(1)}50%{transform:scale(1.1)}}#timer-display{font-size:1.2rem;font-weight:600;padding:5px 12px;background:var(--color-bg-light);border-radius:8px}#timer-display.warning{color:var(--color-warning)}#timer-display.danger{color:var(--color-danger);animation:pulse .5s ease infinite}#lives-display{font-size:1.5rem;letter-spacing:3px}.rocket-container{position:relative;width:60px;height:200px;background:var(--color-bg-light);border-radius:30px;overflow:hidden;border:2px solid var(--color-primary)}#rocket-progress{position:absolute;bottom:0;width:100%;background:linear-gradient(0deg,var(--color-primary),var(--color-primary-light));transition:height .5s ease;border-radius:0 0 28px 28px}#rocket{position:absolute;font-size:2rem;left:50%;transform:translate(-50%);transition:bottom .5s ease;filter:drop-shadow(0 0 10px rgba(255,255,255,.5))}#progress-text{position:absolute;bottom:-30px;left:50%;transform:translate(-50%);font-weight:600;color:var(--color-text-dim)}.problem-container{background:var(--color-bg-light);padding:30px 50px;border-radius:20px;box-shadow:var(--shadow-glow);margin:20px 0}#problem-display{font-size:3rem;font-weight:700;color:var(--color-text);font-family:Courier New,monospace}.answer-container{display:flex;gap:10px;align-items:center}#answer-input{width:150px;padding:15px;font-size:2rem;text-align:center;border:3px solid var(--color-primary);border-radius:12px;background:var(--color-bg-light);color:var(--color-text);font-family:Courier New,monospace}#answer-input:focus{outline:none;box-shadow:var(--shadow-glow)}#submit-btn{padding:15px 30px;font-size:1.5rem;font-weight:700;background:linear-gradient(135deg,var(--color-primary),var(--color-primary-dark));color:#fff;border:none;border-radius:12px;cursor:pointer;transition:all .2s}#submit-btn:hover{transform:scale(1.05);box-shadow:var(--shadow-glow)}.number-pad{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;max-width:300px;margin-top:15px}.num-btn{padding:18px;font-size:1.5rem;font-weight:700;background:var(--color-bg-light);color:var(--color-text);border:2px solid var(--color-primary);border-radius:12px;cursor:pointer;transition:all .15s}.num-btn:hover{background:var(--color-primary);transform:scale(1.05)}.num-btn:active{transform:scale(.95)}.num-btn.action{background:var(--color-primary-dark);font-size:1rem}#message-display{height:35px;font-size:1.3rem;font-weight:600;color:var(--color-success)}#message-display.animate{animation:popIn .3s ease}@keyframes popIn{0%{transform:scale(.8);opacity:0}to{transform:scale(1);opacity:1}}#result-screen{justify-content:center}.result-content{text-align:center;background:var(--color-bg-light);padding:40px;border-radius:24px;box-shadow:var(--shadow-glow)}#result-title{font-size:2.5rem;margin-bottom:15px}#result-title.win{background:linear-gradient(135deg,var(--color-success),#6ee7b7);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}#result-title.lose{color:var(--color-secondary)}#result-message{font-size:1.2rem;color:var(--color-text-dim);margin-bottom:20px}#final-score{font-size:2rem;font-weight:700;color:var(--color-warning);margin-bottom:10px}#result-stats{color:var(--color-text-dim);margin-bottom:25px;line-height:1.8}.result-buttons{display:flex;gap:15px;justify-content:center;flex-wrap:wrap}.primary-btn,.secondary-btn{padding:15px 30px;border:none;border-radius:12px;font-size:1.1rem;font-weight:700;cursor:pointer;transition:all .2s}.primary-btn{background:linear-gradient(135deg,var(--color-primary),var(--color-primary-dark));color:#fff}.primary-btn:hover{transform:translateY(-3px);box-shadow:var(--shadow-glow)}.secondary-btn{background:var(--color-bg);color:var(--color-text);border:2px solid var(--color-primary)}.secondary-btn:hover{background:var(--color-primary)}#confetti-container{position:fixed;top:0;left:0;width:100%;height:100%;pointer-events:none;z-index:100}.confetti{position:absolute;width:10px;height:10px;top:-10px;animation:confetti-fall 3s ease-in forwards}@keyframes confetti-fall{0%{transform:translateY(0) rotate(0);opacity:1}to{transform:translateY(100vh) rotate(720deg);opacity:0}}@media (max-width: 480px){.game-title{font-size:2.5rem}#problem-display{font-size:2.2rem}.problem-container{padding:20px 30px}#answer-input{width:120px;font-size:1.5rem}.num-btn{padding:14px;font-size:1.3rem}.rocket-container{height:150px;width:50px}}