:root{--primary-bg: #f4f6f9;--secondary-bg: #ffffff;--text-color: #212529;--primary-color: #007bff;--secondary-color: #6c757d;--success-color: #28a745;--danger-color: #dc3545;--warning-color: #ffc107;--info-color: #17a2b8;--border-radius: 8px;--box-shadow: 0 2px 10px rgba(0, 0, 0, .1)}body{font-family:Segoe UI,Arial,sans-serif;background-color:var(--primary-bg);color:var(--text-color);margin:0;padding:15px;transition:box-shadow .2s,padding-top .3s ease;min-height:100vh}.border-correct{box-shadow:inset 0 0 60px #28a74599!important;transition:box-shadow .1s ease-out}.border-wrong{box-shadow:inset 0 0 60px #dc354599!important;animation:shake .4s cubic-bezier(.36,.07,.19,.97) both}@keyframes shake{0%,to{transform:translate(0)}10%,30%,50%,70%,90%{transform:translate(-5px)}20%,40%,60%,80%{transform:translate(5px)}}.rainbow-text{background:linear-gradient(to right,#d32f2f,#f57c00,#fbc02d,#388e3c,#1976d2,#7b1fa2);-webkit-background-clip:text;background-clip:text;color:transparent;animation:rainbow_anim 1s linear infinite;font-weight:900!important}@keyframes rainbow_anim{to{background-position:200% center}}#reward-overlay{position:fixed;top:0;left:0;width:100%;height:100%;pointer-events:none;z-index:1500;display:flex;flex-direction:column;align-items:center;justify-content:center}#reward-status-text{font-size:3rem;font-weight:800;text-transform:uppercase;text-align:center;text-shadow:2px 2px 4px rgba(0,0,0,.3);opacity:0;transform:scale(.5);transition:all .3s cubic-bezier(.175,.885,.32,1.275);padding:10px 20px;background:#fffc;border-radius:15px;-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px)}#reward-status-text.show{opacity:1;transform:scale(1)}#reward-badge{position:fixed;top:20px;left:50%;transform:translate(-50%);padding:8px 25px;border-radius:30px;background:#fff;border:2px solid #ddd;font-weight:700;font-size:1.2rem;color:#555;box-shadow:0 4px 6px #0000001a;z-index:1501;opacity:0;transition:opacity .3s}#reward-badge.show{opacity:1}.container{max-width:800px;margin:auto;background-color:var(--secondary-bg);padding:20px;border-radius:var(--border-radius);box-shadow:var(--box-shadow);overflow-y:auto;max-height:95vh;transition:padding-bottom .3s;position:relative;z-index:10}.container.pb-safe{padding-bottom:100px!important}.screen{display:none}.screen.active{display:block}h1,h2,h3{text-align:center;color:var(--primary-color)}.button-group{display:grid;grid-template-columns:1fr;gap:10px;margin-bottom:20px}.btn{padding:12px;font-size:16px;font-weight:700;color:#fff;background-color:var(--primary-color);border:none;border-radius:var(--border-radius);cursor:pointer;text-align:center;transition:background-color .2s,transform .1s}.btn:active{transform:translateY(2px)}.btn:hover{background-color:#0056b3}.btn-secondary{background-color:var(--secondary-color)}.btn-secondary:hover{background-color:#5a6268}.btn-danger{background-color:var(--danger-color)}.btn-danger:hover{background-color:#c82333}.btn-warning{background-color:var(--warning-color)}.btn-warning:hover{background-color:#e0a800}.btn-success{background-color:var(--success-color)}.btn-success:hover{background-color:#218838}.modal{display:none;position:fixed;top:0;left:0;width:100%;height:100%;background-color:#0009;z-index:2500}.modal-content{background-color:var(--secondary-bg);margin:15% auto;padding:20px;border-radius:var(--border-radius);width:90%;max-width:400px;box-shadow:0 5px 15px #0000004d;position:relative;text-align:center}#helpModal .modal-content{max-width:800px;text-align:left;margin:5% auto}.floating-action-bar{position:fixed;bottom:0;left:0;width:100%;background:#fffffff2;-webkit-backdrop-filter:blur(5px);backdrop-filter:blur(5px);border-top:1px solid #e0e0e0;padding:15px;box-shadow:0 -4px 15px #0000001a;z-index:2000;display:flex;justify-content:center;animation:slideUp .3s ease-out}@keyframes slideUp{0%{transform:translateY(100%)}to{transform:translateY(0)}}.floating-action-bar .btn{width:100%;max-width:800px;border-radius:12px;font-size:18px;padding:15px;box-shadow:0 4px 6px #32325d1c,0 1px 3px #00000014}.tntln-textarea{width:100%;min-height:120px;padding:20px;border:2px solid #ccc;border-radius:12px;font-size:22px;font-family:inherit;margin-bottom:25px;box-sizing:border-box;transition:border-color .2s,box-shadow .2s;resize:none;overflow:hidden;background-color:#fff;color:#000}.tntln-textarea:focus{border-color:var(--primary-color);outline:none;box-shadow:0 0 8px #007bff4d}.options-container label{display:flex;align-items:flex-start;margin-bottom:10px;padding:12px;border:1px solid #ddd;border-radius:5px;cursor:pointer;transition:background-color .2s}.options-container label input{margin-top:4px;flex-shrink:0}.options-container label:hover{background-color:#f0f0f0}.tf-option{display:flex;align-items:center;justify-content:space-between;padding:12px;border:1px solid #ddd;border-radius:var(--border-radius);margin-bottom:10px}.tf-btn{padding:8px 16px;border:1px solid var(--secondary-color);background-color:#fff;color:var(--secondary-color);border-radius:20px;cursor:pointer;font-weight:700;transition:all .2s;min-width:80px;text-align:center}.tf-btn.selected-true{background-color:var(--success-color);color:#fff;border-color:var(--success-color)}.tf-btn.selected-false{background-color:var(--danger-color);color:#fff;border-color:var(--danger-color)}.progress-wrapper{margin-bottom:20px}.progress-bar-container{display:flex;height:10px;background-color:#e9ecef;border-radius:5px;overflow:hidden;width:100%;margin-bottom:8px}.progress-segment{flex:1;border-right:1px solid #fff;transition:background-color .3s}.progress-segment:last-child{border-right:none}.progress-segment.correct{background-color:var(--success-color)!important}.progress-segment.incorrect{background-color:var(--danger-color)!important}.progress-segment.active{background-color:#adb5bd}.progress-info{display:flex;justify-content:center;gap:15px;font-size:1rem;color:var(--secondary-color);flex-wrap:wrap;align-items:center}#settings-icon-container{position:absolute;top:15px;right:20px;cursor:pointer;z-index:100;padding:5px}.hamburger-line{width:25px;height:3px;background-color:var(--secondary-color);margin:5px 0;transition:.3s}#settings-panel{display:none;position:absolute;top:50px;right:20px;background-color:var(--secondary-bg);border-radius:var(--border-radius);box-shadow:var(--box-shadow);padding:15px;z-index:99;min-width:250px;border:1px solid #eee}.settings-row{display:flex;align-items:center;justify-content:space-between;margin-bottom:12px}.switch{position:relative;display:inline-block;width:44px;height:24px}.switch input{opacity:0;width:0;height:0}.slider{position:absolute;cursor:pointer;top:0;left:0;right:0;bottom:0;background-color:#ccc;transition:.4s;border-radius:34px}.slider:before{position:absolute;content:"";height:16px;width:16px;left:4px;bottom:4px;background-color:#fff;transition:.4s;border-radius:50%}input:checked+.slider{background-color:var(--primary-color)}input:checked+.slider:before{transform:translate(20px)}.history-item{background:#fff;border:1px solid #e0e0e0;border-radius:12px;padding:15px;margin-bottom:15px;box-shadow:0 2px 5px #0000000d}.history-header{display:flex;justify-content:space-between;font-size:14px;color:#555;margin-bottom:8px;font-weight:700}.history-stats{display:flex;justify-content:space-between;font-size:14px;margin-bottom:10px}.history-stats div{display:flex;gap:10px}.history-bar{display:flex;height:8px;border-radius:4px;overflow:hidden;margin-bottom:15px;background:#eee}.h-bar-green{background-color:var(--success-color)}.h-bar-red{background-color:var(--danger-color)}.h-bar-gray{background-color:#ccc}.history-actions{display:flex;gap:8px}.history-actions button{flex:1;padding:8px;font-size:13px;border-radius:6px;border:none;cursor:pointer;font-weight:700;color:#fff}.btn-h-retry-wrong{background-color:var(--warning-color);color:#333!important}.btn-h-retry-all{background-color:var(--primary-color)}.btn-h-delete{background-color:var(--danger-color);flex:.4!important}.no-history{text-align:center;color:#888;padding:30px 0;font-style:italic}