:root{--primary-color: #4285F4;--secondary-color: #34A853;--accent-color: #FBBC05;--danger-color: #EA4335;--background-color: #f0f2f5;--text-color: #3c4043;--card-background: #ffffff;--border-color: #e0e0e0;--border-radius: 8px;--box-shadow: 0 4px 6px rgba(0, 0, 0, .1);--btn-secondary-bg: #f1f3f4;--btn-secondary-hover-bg: #e8eaed;--btn-icon-hover-bg: #e8f0fe;--option-bg: #f8f9fa;--option-border: #dadce0;--option-hover-bg: #e8f0fe;--correct-bg: #e6f4ea;--correct-border: var(--secondary-color);--correct-text: #137333;--incorrect-bg: #fce8e6;--incorrect-border: var(--danger-color);--incorrect-text: #c5221f;--explanation-bg: #f8f9fa}[data-theme=dark]{--primary-color: #8ab4f8;--secondary-color: #81c995;--accent-color: #fdd663;--danger-color: #f28b82;--background-color: #121212;--text-color: #e8eaed;--card-background: #1e1e1e;--border-color: #3c4043;--box-shadow: 0 4px 6px rgba(0, 0, 0, .4);--btn-secondary-bg: #3c4043;--btn-secondary-hover-bg: #4a4e52;--btn-icon-hover-bg: #3c4043;--option-bg: #2d2d2d;--option-border: #5f6368;--option-hover-bg: #3c4043;--correct-bg: #283c31;--correct-border: var(--secondary-color);--correct-text: #a8d5b5;--incorrect-bg: #442f2e;--incorrect-border: var(--danger-color);--incorrect-text: #f6a9a3;--explanation-bg: #2d2d2d}*{box-sizing:border-box;margin:0;padding:0}body,html{transition:background-color .3s,color .3s}body{font-family:Roboto,sans-serif;background-color:var(--background-color);color:var(--text-color);line-height:1.6;margin-bottom:80px;padding:1rem;overflow-x:hidden}#root{max-width:800px;margin:0 auto;background-color:var(--card-background);border-radius:var(--border-radius);box-shadow:var(--box-shadow);overflow:hidden;transition:background-color .3s;min-height:80vh}.app-container{padding:1rem 2rem 2rem;overflow:hidden}.global-loader-container{position:fixed;top:0;left:0;right:0;bottom:0;background-color:#00000080;display:flex;justify-content:center;align-items:center;z-index:2000;animation:fadeIn .2s ease}.global-loader-container .loader-container{background:var(--card-background);padding:2rem;border-radius:var(--border-radius);box-shadow:var(--box-shadow)}.global-loader-container p{color:var(--text-color)}.login-container{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:60vh;padding:1rem}.login-box{width:100%;max-width:360px;padding:2rem;background-color:var(--card-background);border-radius:var(--border-radius);text-align:center}.login-box h2{color:var(--primary-color);margin-bottom:.5rem}.login-box p{margin-bottom:1.5rem;color:#666}[data-theme=dark] .login-box p{color:#9aa0a6}.login-box form{display:flex;flex-direction:column;gap:1rem}.input-group{text-align:left}.input-group label{display:block;margin-bottom:.25rem;font-weight:500}.input-group input{width:100%;padding:.75rem;font-size:1rem;border:1px solid var(--border-color);border-radius:var(--border-radius);background-color:var(--background-color);color:var(--text-color)}.login-btn{width:100%;margin-top:1rem}.manage-account-btn{width:100%;margin-top:.75rem;text-align:center;text-decoration:none;display:inline-block}.screen-view{animation-duration:.4s;animation-timing-function:cubic-bezier(.25,.8,.25,1)}@keyframes fadeInUp{0%{opacity:0;transform:translateY(15px)}to{opacity:1;transform:translateY(0)}}@keyframes slideInFromRight{0%{opacity:0;transform:translate(50px)}to{opacity:1;transform:translate(0)}}@keyframes slideInFromLeft{0%{opacity:0;transform:translate(-50px)}to{opacity:1;transform:translate(0)}}.fade-in-up{animation-name:fadeInUp}.slide-in-right{animation-name:slideInFromRight}.slide-in-left{animation-name:slideInFromLeft}.app-header{text-align:center;margin-bottom:2rem;color:var(--primary-color);font-size:2.5rem;font-weight:700}.screen-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:1.5rem;padding-bottom:1rem;border-bottom:1px solid var(--border-color);min-height:48px}.screen-header .header-left,.screen-header .header-right{flex:1 0 0;display:flex;align-items:center;gap:.5rem}.screen-header .header-left{justify-content:flex-start}.screen-header .header-right{justify-content:flex-end}.screen-header h2{font-size:16px;color:var(--text-color);margin:0;text-align:center;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.coin-balance{font-size:1rem;color:var(--secondary-color);font-weight:700;white-space:nowrap;background-color:var(--btn-icon-hover-bg);padding:.4rem .8rem;border-radius:var(--border-radius)}.language-toggle-group{display:flex;border:1px solid var(--primary-color);border-radius:var(--border-radius);overflow:hidden}.lang-btn{background:var(--card-background);border:none;padding:.4rem .8rem;cursor:pointer;font-size:.9rem;font-weight:500;color:var(--primary-color);transition:background-color .2s,color .2s}.lang-btn.active{background-color:var(--primary-color);color:var(--card-background)}.lang-btn:disabled{cursor:not-allowed;opacity:.7}.lang-btn.active:disabled{background-color:var(--primary-color);opacity:.5;color:var(--card-background)}.home-header-actions{display:flex;align-items:center;gap:.5rem}.home-actions{display:flex;justify-content:center;gap:1rem;margin-bottom:2rem}.grid-container{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:1.5rem}.subject-card{background:var(--card-background);border-radius:var(--border-radius);padding:1.5rem 1rem;text-align:center;cursor:pointer;transition:transform .2s ease-in-out,box-shadow .2s ease-in-out;border:1px solid var(--border-color);display:flex;flex-direction:column;justify-content:space-between;gap:1rem}.subject-card:hover{transform:translateY(-5px);box-shadow:0 8px 15px #00000026}.subject-card p{font-size:1.1rem;font-weight:500;margin:0;flex-grow:1;display:flex;align-items:center;justify-content:center}.chapter-card-wrapper{grid-column:span 1;transition:all .3s ease-in-out}.chapter-card-wrapper.expanded{grid-column:1 / -1}.chapter-card{background:var(--card-background);border-radius:var(--border-radius);padding:1.5rem 1rem;text-align:center;cursor:pointer;transition:transform .2s ease-in-out,box-shadow .2s ease-in-out,border-radius .1s linear,background-color .3s;border:1px solid var(--border-color);display:flex;flex-direction:column;justify-content:center}.chapter-card-wrapper.expanded .chapter-card{border-bottom-left-radius:0;border-bottom-right-radius:0}.chapter-card:hover{transform:translateY(-5px);box-shadow:0 8px 15px #00000026}.chapter-card p{font-size:1.1rem;font-weight:500;margin:0}.progress-indicator{font-size:.9rem;color:var(--secondary-color);margin-top:.5rem;font-weight:400}.levels-preview{max-height:0;overflow:hidden;transition:max-height .4s ease-out,padding-top .4s ease-out,padding-bottom .4s ease-out;padding-left:1.5rem;padding-right:1.5rem;padding-top:0;padding-bottom:0;background-color:var(--background-color);border-radius:0 0 var(--border-radius) var(--border-radius);margin-top:-1px;border:1px solid var(--border-color);border-top:none;text-align:left}.chapter-card-wrapper.expanded .levels-preview{max-height:400px;padding-top:1rem;padding-bottom:1rem}.levels-preview-header{display:flex;justify-content:center;align-items:center;position:relative;margin-bottom:.75rem}.levels-preview-header h4{margin:0;font-weight:500;color:var(--primary-color)}.jump-level-btn{position:absolute;right:0;top:50%;transform:translateY(-50%);background:transparent;border:none;cursor:pointer;padding:4px;border-radius:50%;display:flex;align-items:center;justify-content:center;color:var(--primary-color);transition:background-color .2s}.jump-level-btn:hover{background-color:var(--btn-icon-hover-bg)}.jump-level-btn svg{width:20px;height:20px}.levels-preview ul{list-style:none;padding-left:0;margin-bottom:1rem}.levels-preview li{display:flex;justify-content:space-between;align-items:center;padding:.5rem 0;font-size:.9rem;border-bottom:1px solid var(--border-color)}.levels-preview li:last-child{border-bottom:none}.more-levels-indicator{font-style:italic;color:#666;text-align:center;justify-content:center}.difficulty-tag{padding:.2rem .5rem;border-radius:12px;font-size:.75rem;font-weight:500;color:#fff;flex-shrink:0;margin-left:1rem}.difficulty-tag.basic{background-color:#34a853}.difficulty-tag.elementary{background-color:#4285f4}.difficulty-tag.intermediate{background-color:#fbbc05;color:#3c4043}.difficulty-tag.advanced{background-color:#f29900}.difficulty-tag.expert{background-color:#ea4335}.start-quiz-btn{width:100%;margin-top:1rem}.progress-bar-container{width:100%;height:15px;background-color:var(--btn-secondary-bg);border-radius:12px;overflow:hidden;position:relative;border:1px solid var(--border-color);flex-shrink:0}.progress-bar-fill{height:100%;background-color:var(--secondary-color);border-radius:12px 0 0 12px;transition:width .5s ease-in-out}.progress-bar-text{position:absolute;top:0;left:0;width:100%;height:100%;display:flex;align-items:center;justify-content:center;color:var(--text-color);font-weight:500;font-size:10px;text-shadow:0 0 2px rgba(0,0,0,.2)}[data-theme=dark] .progress-bar-text{color:#fff;text-shadow:0 0 3px rgba(0,0,0,.5)}.quiz-container{display:flex;flex-direction:column;gap:1.5rem}.question-block{animation-name:fadeInUp;animation-duration:.5s;animation-timing-function:cubic-bezier(.25,.8,.25,1)}.quiz-header{display:flex;justify-content:space-between;align-items:center;gap:1rem}.quiz-header-actions{display:flex;align-items:center;gap:1rem;margin-left:auto}.level-timer{font-size:1rem;font-weight:500;color:var(--text-color);background-color:var(--btn-icon-hover-bg);padding:.4rem .8rem;border-radius:var(--border-radius);flex-shrink:0;white-space:nowrap}.level-info{flex-grow:1;min-width:0}.level-indicator{font-size:1.2rem;font-weight:500;color:var(--primary-color);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.topic-indicator{font-size:1rem;color:#666;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}[data-theme=dark] .topic-indicator{color:#9aa0a6}.quiz-actions{display:flex;align-items:center;gap:.5rem;flex-shrink:0}.refresh-btn,.favorite-btn{background:transparent;border:none;cursor:pointer;padding:4px;border-radius:50%;display:flex;align-items:center;justify-content:center;color:var(--primary-color);transition:background-color .2s,color .2s,transform .2s}.refresh-btn:hover:not(:disabled){background-color:var(--btn-icon-hover-bg);transform:rotate(90deg)}.favorite-btn:hover:not(:disabled){background-color:var(--btn-icon-hover-bg);transform:scale(1.1)}.refresh-btn:disabled,.favorite-btn:disabled{color:#ccc;cursor:not-allowed}.refresh-btn svg,.favorite-btn svg{width:20px;height:20px}.favorite-btn.favorited{color:var(--accent-color)}.favorite-btn.favorited:hover{color:#e0a800}.question-text{font-size:1.25rem;margin-bottom:1rem;min-height:50px}.question-table{width:100%;border-collapse:collapse;margin-top:1rem;font-size:1rem;background-color:var(--background-color);border:1px solid var(--border-color);border-radius:var(--border-radius);overflow:hidden}.question-table th,.question-table td{padding:.75rem;text-align:left;vertical-align:top;border-bottom:1px solid var(--border-color)}.question-table th{background-color:var(--btn-secondary-bg);font-weight:500;color:var(--primary-color)}.question-table tbody tr:last-child td{border-bottom:none}.question-table td:first-child{font-weight:500}.question-table thead+tbody td:nth-child(2){border-left:1px solid var(--border-color)}.question-table tbody td:first-child{width:1%;white-space:nowrap;padding-right:1.5rem}.options-grid{display:grid;grid-template-columns:1fr;gap:.75rem}.option-btn{display:flex;justify-content:space-between;align-items:center;width:100%;padding:1rem;font-size:1rem;background-color:var(--option-bg);border:1px solid var(--option-border);border-radius:var(--border-radius);transition:background-color .2s,border-color .2s,color .2s,opacity .2s;color:var(--text-color)}.option-btn:not(.static){cursor:pointer}.option-text{flex-grow:1;text-align:left;margin-right:1rem}.option-btn:not(:disabled):not(.static):hover{background-color:var(--option-hover-bg);border-color:var(--primary-color)}.option-btn:disabled{cursor:not-allowed}.option-btn:disabled:not(.correct):not(.incorrect){background-color:var(--option-bg);color:#6c757d;opacity:.6}.option-btn.correct{background-color:var(--correct-bg);border-color:var(--correct-border);color:var(--correct-text);font-weight:500}.option-btn.incorrect{background-color:var(--incorrect-bg);border-color:var(--incorrect-border);color:var(--incorrect-text);font-weight:500}.option-btn svg{width:22px;height:22px;flex-shrink:0}.option-btn.correct svg{stroke:var(--secondary-color)}.option-btn.incorrect svg{stroke:var(--danger-color)}.explanation-box{background-color:var(--explanation-bg);border:1px solid var(--border-color);border-radius:var(--border-radius);padding:1rem;margin-top:1rem;animation:fadeIn .5s ease-in-out;border-left-width:5px}.explanation-box.correct-answer{border-left-color:var(--secondary-color)}.explanation-box.wrong-answer{border-left-color:var(--danger-color)}.explanation-box h3{margin-bottom:.5rem;font-weight:700}.explanation-box.correct-answer h3{color:var(--secondary-color)}.explanation-box.wrong-answer h3{color:var(--danger-color)}.quiz-footer{text-align:center;margin-top:1rem;min-height:50px}.favorites-container{display:flex;flex-direction:column;gap:1.5rem}.empty-favorites-text{text-align:center;padding:3rem 1rem;color:#666;font-size:1.1rem;background-color:var(--background-color);border-radius:var(--border-radius)}[data-theme=dark] .empty-favorites-text{color:#9aa0a6}.favorites-list{display:flex;flex-direction:column;gap:2.5rem}.favorite-subject-header{font-size:1.6rem;font-weight:700;color:var(--primary-color);padding-bottom:.5rem;margin-bottom:1.5rem;border-bottom:2px solid var(--primary-color)}.favorite-chapter-group{display:flex;flex-direction:column;gap:1.5rem}.favorite-chapter-header{font-size:1.2rem;font-weight:500;color:var(--text-color);margin-bottom:.5rem;padding-left:.5rem;border-left:4px solid var(--secondary-color)}.favorite-chapter-group+.favorite-chapter-group{margin-top:2rem}.favorite-item-card{background-color:var(--card-background);border:1px solid var(--border-color);border-radius:var(--border-radius);box-shadow:0 2px 4px #0000000d}.favorite-item-header{display:flex;justify-content:space-between;align-items:center;padding:.75rem 1rem;background-color:var(--background-color);border-bottom:1px solid var(--border-color);border-radius:var(--border-radius) var(--border-radius) 0 0}.favorite-item-context .subject-chapter{font-weight:500;color:var(--primary-color)}.favorite-remove-btn{background:transparent;border:none;font-size:1.75rem;font-weight:700;cursor:pointer;color:var(--danger-color);line-height:1;padding:0 .5rem;transition:transform .2s}.favorite-remove-btn:hover{transform:scale(1.2)}.favorite-item-body{padding:1rem;display:flex;flex-direction:column;gap:1rem}.live-test-screen{display:flex;flex-direction:column;gap:2rem}.test-section{padding:1.5rem;border-radius:var(--border-radius);color:#fff}.test-section h3{font-size:1.5rem;margin-bottom:1.5rem;border-bottom:2px solid rgba(255,255,255,.5);padding-bottom:.5rem}.live-section{background:linear-gradient(135deg,#4285f4,#3367d6)}.upcoming-section{background:linear-gradient(135deg,#fbbc05,#f29900)}[data-theme=dark] .upcoming-section{color:#202124}.completed-section{background:linear-gradient(135deg,#34a853,#137333)}.resumed-section{background:linear-gradient(135deg,#f29900,#ea4335)}.test-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:1rem}.test-card{background:var(--card-background);color:var(--text-color);border-radius:var(--border-radius);padding:1rem;box-shadow:var(--box-shadow);display:flex;flex-direction:column;justify-content:space-between;gap:1rem;transition:transform .2s,box-shadow .2s}.test-card:hover{transform:translateY(-4px);box-shadow:0 6px 12px #00000026}.test-card-info h4{margin:0 0 .25rem;font-size:1.1rem}[data-theme=light] .test-card-info h4,[data-theme=dark] .test-card-info h4{color:var(--primary-color)}.test-card-info p{margin:0;font-size:.9rem;color:#666}[data-theme=dark] .test-card-info p{color:#9aa0a6}.test-card-footer{display:flex;justify-content:space-between;align-items:center;margin-top:auto}.test-card-footer span{font-size:.9rem;font-weight:500}.test-card-footer .btn{padding:.5rem 1rem;font-size:.9rem}.empty-tests-text{text-align:center;padding:3rem 1rem;color:#666;font-size:1.1rem;background-color:var(--background-color);border-radius:var(--border-radius)}[data-theme=dark] .empty-tests-text{color:#9aa0a6}.buy-coins-screen{display:flex;flex-direction:column;gap:2rem}.user-info-panel{display:flex;justify-content:space-between;align-items:center;background-color:var(--background-color);padding:1rem 1.5rem;border-radius:var(--border-radius);border:1px solid var(--border-color)}.user-details h4{color:var(--primary-color);margin-bottom:.25rem}.user-details p{margin:0;font-size:.9rem;color:#666}[data-theme=dark] .user-details p{color:#9aa0a6}.coin-balance-large{text-align:right}.coin-balance-large span{font-size:.9rem}.coin-balance-large p{font-size:2rem;font-weight:700;color:var(--secondary-color);margin:0}.pending-request-alert{background-color:var(--accent-color);color:#3c4043;padding:1rem;border-radius:var(--border-radius);text-align:center;font-weight:500}[data-theme=dark] .pending-request-alert{background-color:#fdd663}[data-theme=dark] .pending-request-alert p{color:#202124}.buy-coins-screen h3{border-bottom:2px solid var(--primary-color);padding-bottom:.5rem;margin-top:1rem}.offer-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:1rem}.offer-card{background-color:var(--card-background);border:1px solid var(--border-color);border-radius:var(--border-radius);display:flex;flex-direction:column;text-align:center;overflow:hidden;box-shadow:var(--box-shadow)}.offer-card-header{background-color:var(--primary-color);color:#fff;padding:.75rem}.offer-card-header h4{margin:0;font-size:1.1rem}.offer-card-body{padding:1.5rem 1rem;flex-grow:1}.offer-coins{font-size:1.8rem;font-weight:700;margin-bottom:.25rem}.offer-bonus{color:var(--secondary-color);font-weight:500;margin-bottom:1rem}.offer-price{font-size:1.5rem;font-weight:700}.offer-card-footer{padding:1rem;background-color:var(--background-color)}.offer-card-footer .btn{width:100%}.coin-history-section{margin-top:2rem}.coin-history-table{width:100%;border-collapse:collapse;font-size:.9rem}.coin-history-table th,.coin-history-table td{padding:.75rem;text-align:left;border-bottom:1px solid var(--border-color)}.coin-history-table th{background-color:var(--btn-secondary-bg);font-weight:500}.coin-history-table tbody tr:last-child td{border-bottom:none}.coins-earned{color:var(--secondary-color);font-weight:500}.coins-spent{color:var(--danger-color);font-weight:500}.btn{padding:.75rem 1.5rem;font-size:1rem;font-weight:500;border-radius:var(--border-radius);border:none;cursor:pointer;transition:background-color .2s,transform .1s,color .2s,border-color .2s}.btn:disabled{cursor:not-allowed;opacity:.65}.btn-primary{background-color:var(--primary-color);color:#fff}.btn-primary:hover:not(:disabled){background-color:#3367d6}[data-theme=dark] .btn-primary:hover:not(:disabled){background-color:#9ac2f9}.btn:active{transform:scale(.98)}.btn-secondary{background-color:var(--btn-secondary-bg);color:var(--text-color);border:1px solid var(--border-color)}.btn-secondary:hover{background-color:var(--btn-secondary-hover-bg)}.btn-icon{background:transparent;border:none;cursor:pointer;padding:8px;border-radius:50%;display:flex;align-items:center;justify-content:center;color:var(--primary-color);transition:background-color .2s}.btn-icon:hover{background-color:var(--btn-icon-hover-bg)}.btn-icon svg{width:24px;height:24px}.loader-container{text-align:center;padding:2rem;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:1rem}.loader{border:4px solid var(--border-color);border-radius:50%;border-top:4px solid var(--primary-color);width:40px;height:40px;animation:spin 1s linear infinite;margin:0}.error-text{color:var(--danger-color);text-align:center;padding:1rem 0 0;font-weight:500}.modal-backdrop{position:fixed;top:0;left:0;right:0;bottom:0;background-color:#0009;display:flex;justify-content:center;align-items:center;z-index:1000;animation:fadeIn .2s ease}.modal-content{background:var(--card-background);padding:1.5rem;border-radius:var(--border-radius);box-shadow:0 5px 15px #0000004d;width:90%;max-width:400px;animation:slideIn .3s ease-out;border-top:5px solid var(--primary-color)}.modal-content.modal-success{border-top-color:var(--secondary-color)}.modal-content.modal-failure{border-top-color:var(--danger-color)}.modal-header{display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid var(--border-color);padding-bottom:.75rem;margin-bottom:1rem}.modal-header h3{margin:0;font-size:1.25rem;color:var(--primary-color)}.modal-success .modal-header h3{color:var(--secondary-color)}.modal-failure .modal-header h3{color:var(--danger-color)}.modal-close-btn{background:transparent;border:none;font-size:1.75rem;cursor:pointer;color:#666;line-height:1}[data-theme=dark] .modal-close-btn{color:#9aa0a6}.modal-body{display:flex;flex-direction:column;gap:1rem}.modal-body p{margin-bottom:1rem}.modal-input{width:100%;padding:.75rem;font-size:1rem;border:1px solid var(--border-color);border-radius:var(--border-radius);margin-bottom:.5rem;background-color:var(--background-color);color:var(--text-color)}.modal-error-text{color:var(--danger-color);font-size:.9rem;margin-top:.25rem;min-height:1.2em}.modal-actions{display:flex;justify-content:flex-end;gap:.75rem;margin-top:1.5rem}.language-selection-actions{display:flex;justify-content:space-around;gap:1rem;margin-top:1.5rem}.language-selection-actions .btn{flex:1}.level-result-content{text-align:center}.score-display{font-size:1.5rem;margin-bottom:1rem}.score-display strong{color:var(--primary-color)}.modal-success .score-display strong{color:var(--secondary-color)}.modal-failure .score-display strong{color:var(--danger-color)}.level-result-content .modal-actions{justify-content:center}.setting-item{display:flex;justify-content:space-between;align-items:center;padding:.75rem 0;border-bottom:1px solid var(--border-color)}.setting-item:last-child{border-bottom:none}.setting-item>.btn-secondary{padding:.4rem .8rem;font-size:.9rem}.setting-item label{font-size:1rem;color:var(--text-color)}.setting-item .modal-input{width:70px;padding:.5rem;margin-bottom:0;margin-left:1rem;text-align:center}.toggle-switch{position:relative;display:inline-block;width:50px;height:28px;flex-shrink:0;margin-left:1rem}.toggle-switch 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strong{color:var(--primary-color);margin-right:1rem}.profile-info-item span{text-align:right;word-break:break-all}footer{background-color:#333;color:#fff;text-align:center;padding:1.5rem 2rem;position:fixed;bottom:0;left:0;width:100%;z-index:1000}footer p{font-size:.9rem;margin:0}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}@keyframes spin-refresh{0%{transform:rotate(0)}to{transform:rotate(-360deg)}}.spinning{animation:spin-refresh 1s linear infinite}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes slideIn{0%{transform:translateY(-30px) scale(.95);opacity:0}to{transform:translateY(0) scale(1);opacity:1}}@media (min-width: 600px){.options-grid{grid-template-columns:1fr 1fr}}@media (max-width: 599px){body{padding:.5rem;-webkit-text-size-adjust:100%}.app-container{padding:1rem}.screen-header h2{font-size:1.1rem}.back-btn{display:none}.grid-container{grid-template-columns:1fr 1fr;gap:.75rem}.subject-card,.chapter-card{padding:1rem .5rem}.subject-card p,.chapter-card p,.progress-indicator{font-size:.9rem}.btn{padding:.7rem 1.2rem;font-size:.9rem;text-decoration:none}.question-text{font-size:1.15rem;line-height:1.5}.option-btn{padding:.8rem;font-size:.95rem}.modal-content{width:95%;padding:1.25rem}.login-box{padding:1.5rem}.offer-grid{grid-template-columns:1fr}footer{padding:1rem}footer p{font-size:.8rem}}@media (max-width: 360px){.coin-balance{font-size:.9rem;padding:.3rem .5rem}.grid-container{grid-template-columns:1fr}}