@font-face{font-family:Noto Music;src:url(/assets/NotoMusic-regular-ZbJvDP-i.woff2) format("woff2");font-weight:400;font-style:normal;font-display:swap}html,body{margin:0;height:100%;font-family:Arial,Helvetica,sans-serif;overflow-x:hidden}*{box-sizing:border-box}.view-hidden-my-lessons{display:none!important;visibility:hidden!important}.auth-must-hide{display:none!important}header{position:sticky;top:0;width:100%;z-index:1000;display:flex;justify-content:space-between;align-items:center;padding:5px 14px;background:linear-gradient(90deg,#f90,#fc0);color:#fff;font-weight:700;transition:top .3s ease-in-out}header #leftBar{display:flex;align-items:center;gap:4px;flex-wrap:wrap}#viewer{display:flex;height:100%;position:relative;z-index:0;overflow:hidden}.modal{display:none;position:fixed;z-index:100;left:0;top:0;width:100%;height:100%;overflow:auto;background-color:#0006;justify-content:center;align-items:center}.modal-content{background-color:#fefefe;margin:5% auto;padding:20px;border:1px solid #888;width:80%;max-width:500px;border-radius:5px;position:relative;max-height:90vh;overflow-y:auto}.modal-content.wide{max-width:800px;width:90%}.modal-close-btn{color:#aaa;position:absolute;top:18px;right:20px;font-size:28px;font-weight:700;cursor:pointer}.modal-close-btn:hover,.modal-close-btn:focus{color:#000;text-decoration:none;cursor:pointer}.button-explanation-modal{display:none;position:fixed;z-index:10000;left:0;top:0;width:100%;height:100%;background-color:#00000080;justify-content:center;align-items:center}.button-explanation-content{background-color:#fff;margin:5% auto;padding:25px;border-radius:8px;width:90%;max-width:500px;box-shadow:0 4px 15px #0003;position:relative;animation:modalFadeIn .3s ease-out}@keyframes modalFadeIn{0%{opacity:0;transform:scale(.9)}to{opacity:1;transform:scale(1)}}.button-explanation-header{display:flex;align-items:center;margin-bottom:15px;padding-bottom:10px;border-bottom:2px solid #f0f0f0}.button-explanation-icon{font-size:24px;margin-right:12px;width:30px;text-align:center}.button-explanation-title{font-size:20px;font-weight:700;color:#333;margin:0}.button-explanation-description{font-size:16px;line-height:1.5;color:#555;margin-bottom:20px}.login-prompt{background:linear-gradient(90deg,#f90,#fc0);color:#fff;padding:15px;border-radius:5px;text-align:center;margin-top:15px}.login-prompt-text{margin:0 0 10px;font-weight:700}.login-button{background:#fff;color:#f90;border:none;padding:8px 20px;border-radius:4px;font-weight:700;cursor:pointer;transition:background-color .3s}.login-button:hover{background:#f5f5f5}.toolbar-icon.logged-out-preview{position:relative;opacity:.8;cursor:help!important}body[data-current-view=pdf-list] #playSubmittedVideoBtn,body[data-current-view=pdf-list] #lessonLogBtn,body[data-current-view=pdf-list] #sendPaymentReminderBtn,body[data-current-view=pdf-list] #sendLessonLinkBtn,body[data-current-view=pdf-list] #recordForTeacherBtn,body[data-current-view=my-lessons] #playSubmittedVideoBtn,body[data-current-view=my-lessons] #lessonLogBtn,body[data-current-view=my-lessons] #sendPaymentReminderBtn,body[data-current-view=my-lessons] #sendLessonLinkBtn,body[data-current-view=manage-students] #playSubmittedVideoBtn,body[data-current-view=manage-students] #lessonLogBtn,body[data-current-view=manage-students] #sendPaymentReminderBtn,body[data-current-view=manage-students] #sendLessonLinkBtn,body[data-current-view=manage-students] #recordForTeacherBtn{display:none!important;visibility:hidden!important}.toolbar-icon.logged-out-preview:before{content:"ℹ️";position:absolute;top:-5px;right:-5px;font-size:10px;background:#fff;border-radius:50%;width:16px;height:16px;display:flex;align-items:center;justify-content:center;box-shadow:0 1px 3px #0000004d;z-index:1}.toolbar-icon.logged-out-preview:hover{opacity:1;transform:scale(1.05)}.toolbar-icon.logged-out-preview{display:inline-block!important;visibility:visible!important}#manageStudentsModal{display:none;position:fixed;z-index:100;left:0;top:0;width:100%;height:100%;overflow:auto;background-color:#0006;padding-top:60px}#manageStudentsModal .modal-content{width:90%;max-width:600px}#studentListTable{width:100%;border-collapse:collapse;margin-top:15px}#studentListTable th,#studentListTable td{border:1px solid #ddd;padding:8px;text-align:left}#studentListTable th{background-color:#f2f2f2}#studentListTable .student-actions button{margin-right:5px;padding:3px 6px;font-size:.9em}#addEditStudentModal{display:none;position:fixed;z-index:101;left:0;top:0;width:100%;height:100%;overflow:auto;background-color:#00000080;padding-top:7px;padding-bottom:7px}#addEditStudentForm label,#addEditStudentForm .form-section-label,#addEditStudentForm input,#addEditStudentForm select{display:block;margin-bottom:10px;width:100%}#addEditStudentForm button{margin-top:15px;margin-right:10px}#addEditStudentModal .modal-content{background:linear-gradient(180deg,#fffaf0,#fff5e6);border:1px solid #ffcc80;box-shadow:0 5px 15px #0003;max-width:700px;width:90%}#addEditStudentTitle{color:#d35400;margin-bottom:20px}#addEditStudentForm label,#addEditStudentForm .form-section-label{font-weight:700;color:#555;margin-bottom:5px}#addEditStudentForm input[type=email],#addEditStudentForm input[type=text],#addEditStudentForm select{padding:8px;border:1px solid #ccc;border-radius:4px;margin-bottom:15px}#addEditStudentForm input[readonly]{background-color:#eee;cursor:not-allowed}#submissionDaysContainer label:hover{background-color:#fff0e0!important}.teaching-mode-btn:hover{opacity:.9;transform:translateY(-1px)}.teaching-mode-btn.active{background-color:#6f42c1!important;box-shadow:0 2px 8px #6f42c14d}.teaching-mode-btn:not(.active){background-color:#6c757d!important}.toggle-switch .toggle-slider{background-color:#ccc!important}.toggle-switch input:checked+.toggle-slider{background-color:#4a2c7a!important}.toggle-switch input:focus+.toggle-slider{box-shadow:0 0 1px #6f42c1}.toggle-slider:before{position:absolute;content:"";height:18px;width:18px;left:3px;bottom:3px;background-color:#fff;transition:.3s;border-radius:50%;box-shadow:0 1px 3px #0000004d}.toggle-switch input:checked+.toggle-slider:before{transform:translate(26px)}#addEditStudentForm .form-actions{display:flex;justify-content:flex-end;gap:10px;margin-top:20px}#addEditStudentForm .form-actions button{padding:10px 20px;border:none;border-radius:5px;cursor:pointer;font-weight:700}#addEditStudentForm #saveStudentBtn{background:linear-gradient(45deg,#f90,#fc0);color:#fff}#addEditStudentForm #cancelStudentBtn{background-color:#ccc;color:#333}#editStudentStatusMsg{margin-top:15px;padding:10px;border-radius:4px;display:none;text-align:center}.modal-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:15px}.modal-header .modal-close-btn{position:static;font-size:24px}#messageAllStudentsModal{display:none;position:fixed;z-index:101;left:0;top:0;width:100%;height:100%;overflow:auto;background-color:#00000080;align-items:center;justify-content:center}#messageAllStudentsModal.show{display:flex}#messageAllStudentsModal .modal-content{background:linear-gradient(180deg,#fffaf0,#fff5e6);border:1px solid #ffcc80;box-shadow:0 5px 15px #0003;max-width:600px;width:90%;margin:0;position:relative;border-radius:8px;max-height:90vh;overflow-y:auto}#messageAllStudentsTitle{color:#d35400;margin-bottom:0;font-size:20px}#messageAllStudentsForm label{display:block;margin-bottom:5px;margin-top:15px;font-weight:700;color:#2c3e50;font-size:14px}#messageAllStudentsForm input,#messageAllStudentsForm textarea{display:block;width:100%;padding:8px 12px;margin-bottom:10px;border:1px solid #ddd;border-radius:4px;font-family:inherit;font-size:14px;box-sizing:border-box}#messageAllStudentsForm input:focus,#messageAllStudentsForm textarea:focus{border-color:#d35400;outline:none;box-shadow:0 0 5px #d354004d}#messageAllStudentsForm textarea{font-family:inherit;line-height:1.4}#messageAllStudentsStatusMsg{padding:10px;margin:10px 0;border-radius:4px;background-color:#d4edda;border:1px solid #c3e6cb;color:#155724;font-size:14px}#messageAllStudentsStatusMsg.error{background-color:#f8d7da;border-color:#f5c6cb;color:#721c24}#messageAllStudentsModal .form-actions{display:flex;justify-content:flex-end;gap:10px;margin-top:20px;padding-top:15px;border-top:1px solid #eee}#messageAllStudentsModal .form-actions button{padding:8px 16px;border:none;border-radius:4px;font-size:14px;cursor:pointer;font-family:inherit}#messageAllStudentsModal #cancelMessageBtn{background-color:#6c757d;color:#fff}#messageAllStudentsModal #cancelMessageBtn:hover{background-color:#5a6268}#messageAllStudentsModal #sendMessageBtn{background-color:#d35400;color:#fff}#messageAllStudentsModal #sendMessageBtn:hover{background-color:#b8470f}#messageAllStudentsModal #sendMessageBtn:disabled{background-color:#ccc;cursor:not-allowed}#assignPdfModal{display:none;position:fixed;z-index:102;left:0;top:0;width:100%;height:100%;overflow:auto;background-color:#0009;padding-top:70px}#assignPdfModal .modal-content{width:90%;max-width:450px}#assignStudentList{list-style:none;padding:0;margin-top:15px;max-height:250px;overflow-y:auto;border:1px solid #eee}#assignStudentList li{padding:8px 12px;border-bottom:1px solid #eee}#assignStudentList li:last-child{border-bottom:none}#assignStudentList label{display:block;cursor:pointer}#assignStudentList input[type=radio]{margin-right:8px}#assignPdfModal button{margin-top:15px;margin-right:10px}#viewStudentWorkModal{display:none;position:fixed;z-index:102;left:0;top:0;width:100%;height:100%;overflow:auto;background-color:#0009;padding-top:70px}#viewStudentWorkModal .modal-content{width:90%;max-width:550px}#assignedPdfList{list-style:none;padding:0;margin-top:15px;max-height:300px;overflow-y:auto;border:1px solid #eee}#assignedPdfList li{padding:10px 15px;border-bottom:1px solid #eee;cursor:pointer}#copyAnnotationsModal{display:none;position:fixed;z-index:103;left:0;top:0;width:100%;height:100%;overflow:auto;background-color:#0009;padding-top:90px}#copyAnnotationsModal .modal-content{width:90%;max-width:400px}#copyAnnotationsForm label{display:block;margin-bottom:10px;cursor:pointer}#copyAnnotationsForm input[type=radio]{margin-right:8px}#copyAnnotationsModal button{margin-top:15px;margin-right:10px}#assignedPdfList li:hover{background-color:#f0f0f0}#assignedPdfList li:last-child{border-bottom:none}#viewStudentWorkModal button{margin-top:15px}#lessonLogModal{display:none;position:fixed;z-index:104;left:0;top:0;width:100%;height:100%;overflow:auto;background-color:#0009;align-items:center;justify-content:center}#lessonLogModal .modal-content{width:95%;max-width:1000px;max-height:90vh;overflow-y:auto;background-color:#fff;border-radius:8px;box-shadow:0 6px 20px #00000026}#lessonLogControls{display:flex;justify-content:space-between;align-items:center;margin-bottom:20px;padding:15px;background-color:#f8f9fa;border-radius:6px}#lessonLogControls button{padding:8px 12px;border:none;border-radius:4px;cursor:pointer;font-weight:700;transition:background-color .3s ease}#lessonLogControls button:hover{opacity:.8}#lessonLogControls button:disabled{opacity:.5;cursor:not-allowed}.week-section{margin-bottom:25px;border:1px solid #e0e0e0;border-radius:8px;overflow:hidden;box-shadow:0 2px 4px #0000001a}.week-header{background:linear-gradient(90deg,#f90,#fc0);color:#fff;padding:15px 20px;font-weight:700;font-size:16px}.week-content{padding:20px}.day-section{margin-bottom:20px;padding:15px;background:#f8f9fa;border-radius:6px;border-left:4px solid #ff9900}.day-section h4{margin:0 0 10px;color:#333;font-size:16px}.lesson-item{padding:12px;margin-bottom:8px;background:#fff;border-radius:4px;border-left:4px solid #ff9900;box-shadow:0 1px 3px #0000001a;transition:box-shadow .3s ease}.lesson-item:hover{box-shadow:0 2px 6px #00000026}.lesson-item strong{color:#333;font-size:15px}.lesson-item .lesson-meta{color:#666;font-size:13px;margin-top:4px}.lesson-item .lesson-time{color:#666;font-size:12px;text-align:right}.lesson-log-reminder-btn{border:none;background:linear-gradient(135deg,#ff9800,#f57c00);color:#fff;border-radius:6px;padding:5px 10px;cursor:pointer;font-size:16px;line-height:1;font-weight:600;display:inline-flex;align-items:center;justify-content:center;box-shadow:0 2px 6px #0000002e;transition:transform .18s ease,box-shadow .18s ease,filter .18s ease}.lesson-log-reminder-btn:hover:not([disabled]){transform:translateY(-1px);box-shadow:0 4px 10px #00000038;filter:brightness(1.05)}.lesson-log-reminder-btn:active:not([disabled]){transform:translateY(0);box-shadow:0 1px 3px #0000002e}.lesson-log-reminder-btn[disabled]{pointer-events:none;cursor:wait}.lesson-log-reminder-btn.is-sending{animation:lessonLogReminderPulse .9s ease-in-out infinite alternate}.lesson-log-reminder-btn.is-success{background:linear-gradient(135deg,#4caf50,#2e7d32);box-shadow:0 3px 8px #2e7d3259}@keyframes lessonLogReminderPulse{0%{box-shadow:0 2px 6px #0000002e;transform:scale(.98)}to{box-shadow:0 4px 12px #0000003d;transform:scale(1)}}#modalFileList{list-style:none;padding:0;margin-top:20px;max-height:300px;overflow-y:auto}#modalFileList li{padding:10px;border-bottom:1px solid #eee;cursor:pointer}#modalFileList li:hover{background-color:#f0f0f0}#modalFileList li:last-child{border-bottom:none}.storage-graph-container{background-color:#e9ecef;border-radius:.3rem;height:20px!important;margin-top:5px;width:100%}.storage-graph-fill.exceeded{background-color:#f44336}#addTextBtn.active{background:#00008b;color:#fff}.toolbar-icon{width:34.2px;height:34.2px;border-radius:5px;display:flex;align-items:center;justify-content:center;background-color:#ffffff8c;border:1px solid rgba(0,0,0,.12);transition:all .2s ease;box-shadow:0 1px 3px #00000026;cursor:pointer;padding:0;position:relative}.toolbar-icon:hover{background-color:#ffffffbf;transform:translateY(-1px);box-shadow:0 2px 6px #00000040;transform-style:preserve-3d;isolation:isolate;z-index:1}.toolbar-zoom-container{position:relative;display:none;align-items:center;justify-content:center}.toolbar-icon.zoom-trigger{color:#111;overflow:hidden}.toolbar-icon.zoom-trigger .zoom-trigger-icon{display:inline-flex;align-items:center;justify-content:center;width:100%;height:100%}.toolbar-icon.zoom-trigger 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#2563eb47;color:#e0f2fe}.toolbar-zoom-container .zoom-dropdown button:disabled{opacity:.6;cursor:progress;transform:none}.toolbar-icon.zoom-trigger.loading{opacity:.6;cursor:progress}.toolbar-icon[data-disable-tooltip=true]:after{display:none!important}.toolbar-icon.active{background-color:#d35400;color:#fff;border-color:#ac4200;box-shadow:0 1px 3px #0000004d,inset 0 1px 5px #0003}.icon-text{font-family:Times New Roman,serif;font-size:20px;font-weight:700;font-style:italic;color:#333;text-shadow:0 1px 1px rgba(255,255,255,.5)}.toolbar-icon.active .icon-text{color:#fff;text-shadow:0 1px 1px rgba(0,0,0,.3)}.toolbar-icon:hover:after{content:attr(data-title);position:absolute;bottom:-28px;left:50%;transform:translate(-50%);background:#333333e6;color:#fff;padding:5px 10px;border-radius:4px;font-size:12px;font-weight:400;white-space:nowrap;z-index:10}#profileButton:hover:after{display:none!important}#favoritesBtn:after,#favoritesBtn:hover:after{content:none!important;display:none!important}.toolbar-button-with-text{width:auto;padding:0 12px}.toolbar-button-with-text .icon-text{white-space:nowrap}.toolbar-icon.promotional-button{background:linear-gradient(45deg,#f90,#fc0);border-color:#f60;position:relative;animation:promotionalPulse 2s infinite}.toolbar-icon.promotional-button:before{content:"⭐";position:absolute;top:-3px;right:-3px;font-size:12px;background:#f60;color:#fff;border-radius:50%;width:16px;height:16px;display:flex;align-items:center;justify-content:center;font-weight:700;z-index:2}.toolbar-icon.promotional-button:hover{background:linear-gradient(45deg,#fa0,#fd0);transform:translateY(-2px) scale(1.05);box-shadow:0 4px 8px #f906}@keyframes promotionalPulse{0%,to{box-shadow:0 0 #ff9900b3}50%{box-shadow:0 0 0 4px #f903}}.teacher-record-btn{background:linear-gradient(135deg,#4caf50,#45a049)!important;border:2px solid #4CAF50!important;box-shadow:0 2px 6px #4caf504d!important}.teacher-record-btn:hover{background:linear-gradient(135deg,#45a049,#4caf50)!important;border-color:#45a049!important;box-shadow:0 3px 8px #4caf5080!important;transform:translateY(-2px)!important}.teacher-record-btn .icon-text{color:#fff!important;text-shadow:0 1px 2px rgba(0,0,0,.3)!important;font-size:18px!important}#pdfArea .student-list-container{padding:20px;background-color:#fff8f0;height:100%;box-sizing:border-box;overflow-y:auto;-webkit-overflow-scrolling:touch;color:#333;text-align:center}#pdfArea .student-list-header{margin-bottom:10px;color:#d35400;text-align:center;font-size:10px}#pdfArea .students-grid{display:flex;flex-wrap:wrap;justify-content:center;gap:20px}.manage-students-title{padding-top:10px;margin-bottom:10px!important}@media (max-width: 900px) and (orientation: landscape){body[data-current-view=manage-students] #pdfArea .student-list-container{overflow:visible!important;height:auto!important;width:100%!important}}@media (max-width: 900px) and (orientation: portrait){body[data-current-view=manage-students] #viewer{flex-direction:column!important;overflow:hidden!important}body[data-current-view=manage-students] #pdfArea{width:100%!important;flex:1!important;overflow-y:auto!important;overflow-x:hidden!important;-webkit-overflow-scrolling:touch!important;overscroll-behavior:contain!important}body[data-current-view=manage-students] #videoArea{display:none!important;width:0!important;height:0!important;flex-basis:0!important;flex-grow:0!important;flex-shrink:0!important}body[data-current-view=manage-students] #resizer{display:none!important;width:0!important;height:0!important}body[data-current-view=manage-students] #pdfArea .student-list-container{overflow:visible!important;height:auto!important;width:100%!important;min-height:auto!important}body[data-current-view=pdf-list] #viewer{flex-direction:column!important;overflow:hidden!important}body[data-current-view=pdf-list] #pdfArea{width:100%!important;flex:1!important;overflow-y:auto!important;overflow-x:hidden!important;-webkit-overflow-scrolling:touch!important;overscroll-behavior:contain!important;position:relative!important}body[data-current-view=pdf-list].allow-body-scroll-fallback{overflow:auto!important;-webkit-overflow-scrolling:touch!important}body[data-current-view=pdf-list] #videoArea{display:none!important;width:0!important;height:0!important;flex-basis:0!important;flex-grow:0!important;flex-shrink:0!important}body[data-current-view=pdf-list] #resizer{display:none!important;width:0!important;height:0!important}body[data-current-view=pdf-list] #pdfArea.pdf-list-container{overflow-y:auto!important;overflow-x:hidden!important;-webkit-overflow-scrolling:touch!important;overscroll-behavior:contain!important;height:100%!important;max-height:100%!important;width:100%!important;padding:20px!important;padding-bottom:calc(64px + env(safe-area-inset-bottom))!important}body[data-current-view=my-lessons] #viewer{flex-direction:column!important;overflow:hidden!important}body[data-current-view=my-lessons] #pdfArea{width:100%!important;flex:1!important;overflow-y:auto!important;overflow-x:hidden!important;-webkit-overflow-scrolling:touch!important;overscroll-behavior:contain!important;position:relative!important}body[data-current-view=my-lessons] #videoArea{display:none!important;width:0!important;height:0!important;flex-basis:0!important;flex-grow:0!important;flex-shrink:0!important}body[data-current-view=my-lessons] 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