*{box-sizing:border-box;margin:0;padding:0}:root{--blue:#1a1a2e;--blue-light:#16213e;--purple:#533483;--pink:#e94560;--gold:#f5c542;--green:#4ecca3;--red:#e94560;--white:#eee;--gray:#888;--bg:#0f0f23}body{background:var(--bg);color:var(--white);min-height:100dvh;font-family:Inter,sans-serif;overflow-x:hidden}.pixel-font{font-family:"Press Start 2P",monospace}@keyframes slideUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}@keyframes shake{0%,to{transform:translate(0)}20%{transform:translate(-8px)}40%{transform:translate(8px)}60%{transform:translate(-4px)}80%{transform:translate(4px)}}@keyframes coinFloat{0%{opacity:1;transform:translateY(0)scale(1)}to{opacity:0;transform:translateY(-50px)scale(1.3)}}@keyframes bounceIn{0%{transform:scale(0)}60%{transform:scale(1.15)}to{transform:scale(1)}}@keyframes streakGlow{0%,to{text-shadow:0 0 8px var(--gold)}50%{text-shadow:0 0 20px var(--gold), 0 0 40px var(--pink)}}@keyframes confetti{0%{opacity:1;transform:translateY(0)rotate(0)}to{opacity:0;transform:translateY(-80px)rotate(360deg)}}.animate-slide-up{animation:.4s ease-out slideUp}.animate-shake{animation:.5s ease-in-out shake}.animate-bounce-in{animation:.4s ease-out bounceIn}.animate-streak{animation:1s ease-in-out infinite streakGlow}.app{flex-direction:column;max-width:480px;min-height:100dvh;margin:0 auto;display:flex;position:relative}.header{background:var(--blue);border-bottom:3px solid var(--purple);flex-shrink:0;justify-content:space-between;align-items:center;padding:14px 16px;display:flex}.header-title{color:var(--gold);font-family:"Press Start 2P",monospace;font-size:12px}.coin-display{border:2px solid var(--gold);color:var(--gold);background:#f5c5421f;border-radius:20px;align-items:center;gap:6px;padding:6px 12px;font-size:14px;font-weight:700;display:flex;position:relative}.nav{background:var(--blue);border-top:3px solid 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#e945604d}.exercise-header{justify-content:space-between;align-items:center;margin-bottom:12px;display:flex}.exercise-topic{color:var(--gold);font-family:"Press Start 2P",monospace;font-size:10px}.exercise-progress{color:var(--gray);font-size:13px}.progress-bar{background:var(--blue);border-radius:3px;width:100%;height:6px;margin-bottom:16px;overflow:hidden}.progress-fill{background:linear-gradient(90deg, var(--green), var(--gold));border-radius:3px;height:100%;transition:width .3s}.streak-display{text-align:center;min-height:22px;margin-bottom:14px;font-size:13px}.streak-display.on-fire{color:var(--gold);font-weight:700}.question-card{background:var(--blue);border:2px solid var(--blue-light);border-radius:16px;margin-bottom:14px;padding:22px}.question-type{color:var(--purple);text-transform:uppercase;letter-spacing:1px;margin-bottom:10px;font-size:11px;font-weight:700}.question-text{margin-bottom:18px;font-size:17px;line-height:1.6}.question-text .blank{border-bottom:3px solid var(--gold);text-align:center;min-width:70px;color:var(--gold);padding:0 4px;font-weight:700;display:inline-block}.options-grid{flex-direction:column;gap:8px;display:flex}.option-btn{background:var(--blue-light);width:100%;color:var(--white);cursor:pointer;text-align:left;-webkit-tap-highlight-color:transparent;border:2px solid #0000;border-radius:10px;padding:13px 16px;font-size:15px;transition:all .15s}.option-btn:hover:not(:disabled){border-color:var(--purple);background:#53348333}.option-btn.correct{border-color:var(--green);color:var(--green);background:#4ecca333}.option-btn.wrong{border-color:var(--red);color:var(--red);background:#e9456033}.option-btn:disabled{cursor:default}.answer-input{background:var(--blue-light);border:2px solid var(--blue-light);width:100%;color:var(--white);border-radius:10px;outline:none;padding:13px 16px;font-size:16px;transition:border-color .2s}.answer-input:focus{border-color:var(--purple)}.answer-input.correct{border-color:var(--green);color:var(--green)}.answer-input.wrong{border-color:var(--red);color:var(--red)}.submit-btn{background:var(--purple);color:#fff;cursor:pointer;-webkit-tap-highlight-color:transparent;border:none;border-radius:10px;width:100%;margin-top:10px;padding:13px;font-size:15px;font-weight:600;transition:background .2s}.submit-btn:hover{background:#6b44a0}.submit-btn:disabled{opacity:.5;cursor:not-allowed}.feedback{border-radius:10px;margin-top:10px;padding:12px 16px;font-size:14px;line-height:1.5}.feedback.correct{border:1px solid var(--green);color:var(--green);background:#4ecca31f}.feedback.wrong{border:1px solid var(--red);color:#f0a0a0;background:#e945601f}.next-btn{background:linear-gradient(135deg, var(--green), 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16px;font-size:12px;font-weight:700;display:inline-block}.buy-btn:disabled{opacity:.4;cursor:not-allowed}.achievements-list{flex-direction:column;gap:10px;display:flex}.achievement{background:var(--blue);border:2px solid var(--blue-light);border-radius:12px;align-items:center;gap:12px;padding:12px 14px;display:flex}.achievement.unlocked{border-color:var(--gold)}.achievement-icon{text-align:center;filter:grayscale()opacity(.3);flex-shrink:0;width:40px;font-size:26px}.achievement.unlocked .achievement-icon{filter:none}.achievement-info h4{margin-bottom:2px;font-size:14px}.achievement-info p{color:var(--gray);font-size:12px}.order-items{flex-direction:column;gap:8px;display:flex}.order-item{background:var(--blue-light);border:2px solid var(--purple);color:var(--white);-webkit-user-select:none;user-select:none;border-radius:8px;align-items:center;gap:10px;padding:11px 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coinFloat;position:fixed}.daily-streak{border:2px solid var(--purple);text-align:center;background:linear-gradient(135deg,#5334834d,#e9456026);border-radius:12px;margin-bottom:16px;padding:14px}.daily-streak .days{color:var(--gold);font-family:"Press Start 2P",monospace;font-size:18px}.daily-streak .label{color:var(--gray);margin-top:4px;font-size:12px}.back-btn{color:var(--gray);cursor:pointer;-webkit-tap-highlight-color:transparent;background:0 0;border:none;align-items:center;gap:6px;margin-bottom:12px;padding:4px 0;font-size:14px;display:flex}.back-btn:hover{color:var(--white)}::-webkit-scrollbar{width:4px}::-webkit-scrollbar-track{background:var(--bg)}::-webkit-scrollbar-thumb{background:var(--purple);border-radius:2px}