:root{--color-brand-primary: #ff9900;--color-brand-secondary: #ffcc00;--color-brand-dark: #d35400;--color-brand-hover: #e68a00;--color-brand-light: #fca300;--gradient-brand: linear-gradient(90deg, #ff9900, #ffcc00);--gradient-brand-45: linear-gradient(45deg, #ff9900, #ffcc00);--gradient-brand-135: linear-gradient(135deg, #ff9900, #ffcc00);--gradient-brand-hover: linear-gradient(45deg, #e68a00, #fca300);--gradient-brand-warm: linear-gradient(135deg, #ff9800, #f57c00);--gradient-brand-amber: linear-gradient(45deg, #ff9900, #ffc107);--gradient-gold-badge: linear-gradient(135deg, #FFD700 0%, #FF8C00 100%);--color-accent-purple: #4B0082;--color-accent-purple-medium: #663399;--color-accent-purple-light: #8A2BE2;--color-accent-purple-deep: #6a1b9a;--color-accent-purple-vivid: #9c27b0;--color-accent-purple-muted: #6f42c1;--color-accent-purple-toggle: #4a2c7a;--color-accent-purple-material: #7b1fa2;--gradient-purple: linear-gradient(135deg, #4B0082 0%, #663399 100%);--gradient-purple-cta: linear-gradient(45deg, #6A0DAD, #8A2BE2);--gradient-purple-hover: linear-gradient(45deg, #5e0b9a, #7b1cc0);--gradient-teacher-view: linear-gradient(135deg, #667eea, #764ba2);--color-success: #4CAF50;--color-success-medium: #388E3C;--color-success-dark: #2e7d32;--color-success-darker: #1B5E20;--color-success-very-dark: #145016;--color-success-disabled: #0f3b11;--color-success-hover: #45a049;--color-success-bootstrap: #28a745;--color-success-bootstrap-dark: #1e7e34;--color-success-text-light: #b8f5c3;--gradient-success: linear-gradient(135deg, #28a745, #34c759);--gradient-success-hover: linear-gradient(135deg, #34c759, #48d96d);--gradient-success-bold: linear-gradient(135deg, #4caf50, #2e7d32);--color-error: #e53935;--color-error-dark: #c62828;--color-error-material: #f44336;--color-error-bootstrap: #dc3545;--color-error-text: #721c24;--color-error-text-light: #ffb3b3;--gradient-error: linear-gradient(45deg, #ff4444, #cc0000);--gradient-cancel: linear-gradient(135deg, #FF6B6B, #FF4444);--color-warning: #ffc107;--color-warning-light: #fff3cd;--color-warning-border: #ffcc80;--color-warning-gold: #ffd700;--color-warning-text: #856404;--color-info: #2196F3;--color-info-medium: #1976D2;--color-info-dark: #0d47a1;--color-info-link: #007bff;--color-info-insert: #1565c0;--color-info-cornflower: #6495ED;--gradient-teal: linear-gradient(90deg, #00BCD4, #0097A7);--gradient-deep-orange: linear-gradient(90deg, #E65100, #FF6D00);--color-text-primary: #333;--color-text-secondary: #666;--color-text-muted: #888;--color-text-dark: #2c3e50;--color-text-heading: #444;--color-text-light: #555;--color-text-white: #fff;--color-bg-page: #f0f2f5;--color-bg-surface: #ffffff;--color-bg-surface-alt: #fefefe;--color-bg-light: #f5f5f5;--color-bg-light-alt: #f8f9fa;--color-bg-input: #f0f0f0;--color-bg-hover: #ededed;--color-bg-warm: #fff8f0;--color-bg-warm-alt: #fffaf0;--color-bg-warm-light: #fff5e6;--color-bg-page-gradient: linear-gradient(168deg, #fefefe 0%, #f7f5f0 100%);--color-bg-success: #d4edda;--color-bg-success-border: #c3e6cb;--color-bg-success-text: #155724;--color-bg-error: #f8d7da;--color-bg-error-border: #f5c6cb;--color-border: #e0e0e0;--color-border-medium: #dee2e6;--color-border-light: #eee;--color-border-lighter: #eaeaea;--color-border-input: #d5d5d5;--color-border-subtle: #ddd;--color-border-faint: #ccc;--color-muted: #aaa;--color-text-muted-on-dark: #dddddd;--color-resizer: #888;--color-overlay-subtle: rgba(0, 0, 0, .12);--color-overlay-light: rgba(0, 0, 0, .2);--color-overlay: rgba(0, 0, 0, .4);--color-overlay-dark: rgba(0, 0, 0, .6);--color-btn-active-bg: #c0c0c0;--color-tuner-perfect: #2ecc71;--color-tuner-off: #e74c3c;--color-accent-purple-pale: #F3E5F5;--gradient-neutral-surface: linear-gradient(135deg, #ffffff, #e0e0e0);--font-body: "Segoe UI", -apple-system, BlinkMacSystemFont, Roboto, Oxygen, Ubuntu, sans-serif;--font-fallback: Arial, Helvetica, sans-serif;--font-music: "Noto Music", sans-serif;--font-mono: "Courier New", Consolas, monospace;--space-2xs: 2px;--space-xs: 4px;--space-sm: 8px;--space-md: 16px;--space-lg: 24px;--space-xl: 32px;--space-2xl: 48px;--radius-xs: 3px;--radius-sm: 4px;--radius-md: 8px;--radius-lg: 12px;--radius-xl: 16px;--radius-pill: 20px;--radius-circle: 50%;--shadow-sm: 0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.06);--shadow-md: 0 4px 6px rgba(0,0,0,.1);--shadow-lg: 0 10px 25px rgba(0,0,0,.15);--shadow-glow-brand: 0 0 15px rgba(255, 153, 0, .3);--shadow-glow-purple: 0 0 15px rgba(75, 0, 130, .3);--transition-fast: .15s ease;--transition-normal: .2s ease;--transition-smooth: .3s ease-in-out;--z-dropdown: 10;--z-sticky: 100;--z-modal-backdrop: 100;--z-fixed: 500;--z-header: 1000;--z-banner: 2000;--z-tooltip: 9999;--color-meter-clipping: #ff0000;--color-meter-clip-near: #ff2222;--color-meter-very-high: #ff4444;--color-meter-high: #ff6600;--color-meter-medium: #ffaa00;--color-meter-medium-low: #66cc00;--color-meter-low: #22cc22;--color-meter-very-low: #00aa00;--color-chart-goal-line: #FF5722;--color-chart-teacher-daily-0: #667eea;--color-chart-teacher-daily-50: #764ba2;--color-chart-teacher-daily-100: #5a4fcf;--color-chart-teacher-weekly-border: #0093e6;--color-chart-teacher-weekly-0: #4facfe;--color-chart-teacher-weekly-50: #00f2fe;--color-chart-teacher-remaining-border: #fa709a;--color-chart-remaining-border: #F57C00;--color-checkout-text: #374151;--color-checkout-text-muted: #6b7280;--color-checkout-purple: #4c1d95;--color-checkout-spinner-track: #f3f3f3;--color-checkout-border: #e5e7eb;--color-checkout-bg-alt: #f9fafb;--color-checkout-error: #ef4444;--color-checkout-placeholder: #9ca3af;--color-checkout-gradient-start: #ff9a56;--color-checkout-gradient-end: #ffd93d;--color-checkout-success: #10b981;--color-checkout-success-dark: #059669;--color-checkout-info: #3b82f6;--color-checkout-info-dark: #1d4ed8;--color-calendar-bg-dark: #1a1a1a;--color-calendar-close-btn: #e53e3e;--color-calendar-nav-btn: #3182ce;--color-calendar-no-practice: #4a5568;--color-calendar-some-practice: #d69e2e;--color-calendar-good-practice: #38a169;--color-calendar-day-text-muted: #cbd5e0;--color-calendar-today-border: #f7fafc;--color-storage-pdf-start: #4a90d9;--color-storage-video-start: #34c759;--color-egress-pdf-start: #ff9f43;--color-egress-pdf-end: #fd7e14;--color-egress-video-start: #ee5a24;--gradient-overlay-purple: linear-gradient(135deg, #4a148c 0%, #6a1b9a 25%, #8e24aa 50%, #ab47bc 75%, #ce93d8 100%);--gradient-overlay-progress: linear-gradient(90deg, #e1bee7, #f3e5f5, #ffffff);--color-warning-orange: #ff9800;--gradient-success-btn: linear-gradient(45deg, #2e7d32, #4caf50);--gradient-error-btn: linear-gradient(45deg, #d32f2f, #f44336);--gradient-purple-soft: linear-gradient(90deg, #9c27b0, #e1bee7);--gradient-overlay-warm: linear-gradient(180deg, #ff9800, #ffb74d);--color-bg-info: #cce7ff;--color-bg-info-border: #99d3ff;--color-bg-info-text: #004085;--color-warning-border-amber: #ffeaa7;--color-error-bootstrap-darker: #a71d2a;--color-error-light-bg: #fee2e2;--color-error-light-border: #fca5a5;--color-error-light-text: #b91c1c;--color-success-light: #81C784;--color-bg-warm-cream: #fff3e0;--color-accent-purple-soft: #9370db;--color-accent-purple-bright: #8e24aa;--color-accent-purple-deep-material: #5e35b1;--color-accent-purple-pink: #e1bee7;--color-bg-dark: #212121;--color-calendar-info-text: #b3d9ff;--color-calendar-info-border: #3399ff;--color-input-accent: #007acc;--color-recording-purple: #800080}html[data-visual-preview=professional]{--color-brand-primary: #2f6f73;--color-brand-secondary: #c08a3e;--color-brand-dark: #26313d;--color-brand-hover: #265f63;--color-brand-light: #d6a15a;--gradient-brand: linear-gradient(90deg, #26313d, #2f6f73);--gradient-brand-45: linear-gradient(135deg, #2f6f73, #3f7d82);--gradient-brand-135: linear-gradient(135deg, #26313d, #2f6f73);--gradient-brand-hover: linear-gradient(135deg, #265f63, #244c52);--gradient-brand-warm: linear-gradient(135deg, #8f6736, #c08a3e);--gradient-brand-amber: linear-gradient(135deg, #b98235, #d6a15a);--gradient-gold-badge: linear-gradient(135deg, #c08a3e 0%, #8f6736 100%);--color-accent-purple: #44546a;--color-accent-purple-medium: #586a7f;--color-accent-purple-light: #74859a;--color-accent-purple-deep: #344256;--color-accent-purple-vivid: #516783;--color-accent-purple-muted: #65748b;--color-accent-purple-toggle: #2f3b4d;--color-accent-purple-material: #4c5f78;--gradient-purple: linear-gradient(135deg, #334155 0%, #475569 100%);--gradient-purple-cta: linear-gradient(135deg, #344256, #586a7f);--gradient-purple-hover: linear-gradient(135deg, #2f3b4d, #44546a);--gradient-teacher-view: linear-gradient(135deg, #26313d, #40546a);--color-success: #2f7d5c;--color-success-medium: #2b6f53;--color-success-dark: #245c45;--color-success-darker: #1d4a38;--color-success-very-dark: #16382b;--color-success-disabled: #16382b;--color-success-hover: #3c8d69;--color-success-bootstrap: #2f7d5c;--color-success-bootstrap-dark: #245c45;--color-success-text-light: #c8eadb;--gradient-success: linear-gradient(135deg, #2f7d5c, #3c8d69);--gradient-success-hover: linear-gradient(135deg, #3c8d69, #4a9d78);--gradient-success-bold: linear-gradient(135deg, #2f7d5c, #245c45);--color-error: #b44949;--color-error-dark: #933939;--color-error-material: #b44949;--color-error-bootstrap: #b44949;--color-error-text: #6f2a2a;--color-error-text-light: #f0c2c2;--gradient-error: linear-gradient(135deg, #b44949, #933939);--gradient-cancel: linear-gradient(135deg, #c05b5b, #9d3f3f);--color-warning: #c08a3e;--color-warning-light: #f5ead8;--color-warning-border: #d5b178;--color-warning-gold: #c08a3e;--color-warning-text: #68491f;--color-info: #3d6f91;--color-info-medium: #315a78;--color-info-dark: #263f58;--color-info-link: #2f6f73;--color-info-insert: #315a78;--color-info-cornflower: #5d7f9c;--gradient-teal: linear-gradient(90deg, #2f6f73, #4c8d86);--gradient-deep-orange: linear-gradient(90deg, #8f6736, #c08a3e);--color-text-primary: #1f2933;--color-text-secondary: #53606f;--color-text-muted: #74808f;--color-text-dark: #1f2933;--color-text-heading: #26313d;--color-text-light: #465463;--color-text-white: #fff;--color-bg-page: #f3f5f4;--color-bg-surface: #ffffff;--color-bg-surface-alt: #fbfcfc;--color-bg-light: #eef1f2;--color-bg-light-alt: #f6f7f7;--color-bg-input: #eef1f2;--color-bg-hover: #e5e9ea;--color-bg-warm: #f6efe4;--color-bg-warm-alt: #faf6ef;--color-bg-warm-light: #f8f0e2;--color-bg-page-gradient: linear-gradient(168deg, #f7f8f6 0%, #eef2f1 100%);--color-bg-success: #d9ecdf;--color-bg-success-border: #b8d8c5;--color-bg-success-text: #1e4d38;--color-bg-error: #f1dada;--color-bg-error-border: #ddb5b5;--color-border: #d8dde0;--color-border-medium: #cfd6da;--color-border-light: #e7eaec;--color-border-lighter: #eef0f1;--color-border-input: #c6ced4;--color-border-subtle: #d2d8dc;--color-border-faint: #bfc8ce;--color-muted: #8a95a2;--color-text-muted-on-dark: #dbe2e5;--color-resizer: #7f8a96;--color-overlay-subtle: rgba(31, 41, 51, .1);--color-overlay-light: rgba(31, 41, 51, .18);--color-overlay: rgba(31, 41, 51, .42);--color-overlay-dark: rgba(31, 41, 51, .64);--color-btn-active-bg: #cfd6da;--color-accent-purple-pale: #eef1f4;--gradient-neutral-surface: linear-gradient(135deg, #ffffff, #edf1f2);--radius-md: 6px;--radius-lg: 8px;--radius-xl: 10px;--shadow-sm: 0 1px 2px rgba(31,41,51,.08);--shadow-md: 0 4px 12px rgba(31,41,51,.1);--shadow-lg: 0 14px 30px rgba(31,41,51,.14);--shadow-glow-brand: 0 0 0 3px rgba(47, 111, 115, .16);--shadow-glow-purple: 0 0 0 3px rgba(68, 84, 106, .16);--color-chart-goal-line: #b98235;--color-chart-teacher-daily-0: #2f6f73;--color-chart-teacher-daily-50: #40546a;--color-chart-teacher-daily-100: #26313d;--color-chart-teacher-weekly-border: #2f6f73;--color-chart-teacher-weekly-0: #3d6f91;--color-chart-teacher-weekly-50: #4c8d86;--color-chart-teacher-remaining-border: #b98235;--color-chart-remaining-border: #b98235;--color-checkout-purple: #344256;--color-checkout-gradient-start: #2f6f73;--color-checkout-gradient-end: #c08a3e;--color-checkout-success: #2f7d5c;--color-checkout-success-dark: #245c45;--color-checkout-info: #3d6f91;--color-checkout-info-dark: #263f58;--color-storage-pdf-start: #3d6f91;--color-storage-video-start: #2f7d5c;--color-egress-pdf-start: #b98235;--color-egress-pdf-end: #8f6736;--color-egress-video-start: #8f6736;--gradient-overlay-purple: linear-gradient(135deg, #26313d 0%, #344256 55%, #2f6f73 100%);--gradient-overlay-progress: linear-gradient(90deg, #d9e3e4, #eef2f1, #ffffff);--gradient-purple-soft: linear-gradient(90deg, #586a7f, #cfd6da);--gradient-overlay-warm: linear-gradient(180deg, #2f6f73, #40546a);--color-bg-info: #dce9ef;--color-bg-info-border: #aec9d7;--color-bg-info-text: #263f58;--color-warning-border-amber: #d5b178;--color-error-bootstrap-darker: #7c3030;--color-error-light-bg: #f5e4e4;--color-error-light-border: #dfbaba;--color-error-light-text: #7c3030;--color-success-light: #78b894;--color-bg-warm-cream: #f6efe4;--color-accent-purple-soft: #74859a;--color-accent-purple-bright: #586a7f;--color-accent-purple-deep-material: #344256;--color-accent-purple-pink: #dbe1e6;--color-input-accent: #2f6f73;--color-recording-purple: #44546a}@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}#pdfArea.pdf-list-container{padding:28px 32px;padding-bottom:calc(64px + env(safe-area-inset-bottom));background:var(--color-bg-page-gradient);height:100%;box-sizing:border-box;overflow-y:auto;color:var(--color-text-dark);font-family:var(--font-body)}:root{--topbar-height: 6.627393dvh;--topbar-padding-y: .736377dvh;--topbar-padding-x: 2.061856dvh;--topbar-gap: .589102dvh;--topbar-control-size: 5.036819dvh;--topbar-icon-size: 2.945508dvh;--topbar-svg-size: 2.650957dvh;--topbar-title-font-size: 2.120766dvh;--topbar-title-max-width: 44.182621dvh;--topbar-radius: .736377dvh}@media(pointer:coarse)and (orientation:landscape)and (max-height:520px),(hover:none)and (orientation:landscape)and (max-height:520px){:root{--topbar-height: 48px;--topbar-padding-y: 5px;--topbar-padding-x: 10px;--topbar-gap: 5px;--topbar-control-size: 36px;--topbar-icon-size: 20px;--topbar-svg-size: 18px;--topbar-title-font-size: 14px;--topbar-title-max-width: 240px;--topbar-radius: 6px}}html,body{margin:0;height:100%;font-family:var(--font-fallback);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;height:var(--topbar-height);padding:var(--topbar-padding-y) var(--topbar-padding-x);background:var(--gradient-brand);color:var(--color-text-white);font-weight:700;transition:top .3s ease-in-out}header #leftBar{display:flex;align-items:center;gap:var(--topbar-gap);flex-wrap:nowrap;min-width:0;width:100%;overflow:visible}header #leftBar>*{flex:0 0 auto}header #leftBar>#currentLessonInfo{flex:1 1 0;min-width:0}#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:var(--color-overlay);justify-content:center;align-items:center}.modal-content{background-color:var(--color-bg-surface-alt);margin:5% auto;padding:20px;border:1px solid var(--color-resizer);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:var(--color-muted);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}#customPromptModal{padding:16px}#customPromptModal .modal-content{width:min(760px,calc(100vw - 32px));max-width:760px;max-height:calc(100dvh - 32px);margin:0 auto;padding:0;display:flex;flex-direction:column;overflow:hidden}#customPromptHeader{flex:0 0 auto}#customPromptBody{display:flex;flex:1 1 auto;flex-direction:column;gap:16px;min-height:0;overflow-y:auto;padding:20px}#customPromptMessage{margin:0;min-height:0;overflow-wrap:anywhere}#customPromptMessage>:first-child{margin-top:0}#customPromptMessage>:last-child{margin-bottom:0}#customPromptActions{display:flex;flex:0 0 auto;justify-content:center;align-items:center;gap:10px;flex-wrap:wrap;padding:0 20px 20px}#customPromptInput{margin-bottom:0}#customPromptModal .pdf-compression-preview-grid{align-items:flex-start}#customPromptModal .pdf-compression-preview-column{min-width:min(240px,100%)!important}#customPromptModal .pdf-compression-preview-column img{max-height:min(38dvh,360px);width:auto}@media(max-width:760px){#customPromptModal{padding:12px}#customPromptModal .modal-content{width:calc(100vw - 24px);max-height:calc(100dvh - 24px)}#customPromptBody{padding:16px}#customPromptActions{padding:0 16px 16px}}@media(max-width:620px){#customPromptModal .pdf-compression-preview-column{max-width:100%!important}}@media(max-height:700px){#customPromptModal .pdf-compression-preview-column img{max-height:min(30dvh,260px)}}.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:var(--color-bg-surface);margin:5% auto;padding:25px;border-radius:var(--radius-md);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 var(--color-bg-input)}.button-explanation-icon{font-size:24px;margin-right:12px;width:30px;text-align:center}.button-explanation-title{font-size:20px;font-weight:700;color:var(--color-text-primary);margin:0}.button-explanation-description{font-size:16px;line-height:1.5;color:var(--color-text-light);margin-bottom:20px}.login-prompt{background:var(--gradient-brand);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:var(--color-brand-primary);border:none;padding:8px 20px;border-radius:4px;font-weight:700;cursor:pointer;transition:background-color .3s}.login-button:hover{background:var(--color-bg-light)}.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 var(--color-border-subtle);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,var(--color-bg-warm-alt),var(--color-bg-warm-light));border:1px solid var(--color-warning-border);box-shadow:0 5px 15px #0003;max-width:700px;width:90%}#addEditStudentTitle{color:var(--color-brand-dark);margin-bottom:20px}#addEditStudentForm label,#addEditStudentForm .form-section-label{font-weight:700;color:var(--color-text-light);margin-bottom:5px}#addEditStudentForm input[type=email],#addEditStudentForm input[type=text],#addEditStudentForm select{padding:8px;border:1px solid var(--color-border-faint);border-radius:var(--radius-sm);margin-bottom:15px}#addEditStudentForm input[readonly]{background-color:var(--color-border-light);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:var(--color-accent-purple-muted)!important;box-shadow:0 2px 8px #6f42c14d}.teaching-mode-btn:not(.active){background-color:#6c757d!important}.toggle-switch .toggle-slider{background-color:var(--color-border-faint)!important}.toggle-switch input:checked+.toggle-slider{background-color:var(--color-accent-purple-toggle)!important}.toggle-switch input:focus+.toggle-slider{box-shadow:0 0 1px var(--color-accent-purple-muted)}.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:var(--gradient-brand-45);color:#fff}#addEditStudentForm #cancelStudentBtn{background-color:var(--color-border-faint);color:var(--color-text-primary)}#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,var(--color-bg-warm-alt),var(--color-bg-warm-light));border:1px solid var(--color-warning-border);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:var(--color-brand-dark);margin-bottom:0;font-size:20px}#messageAllStudentsForm label{display:block;margin-bottom:5px;margin-top:15px;font-weight:700;color:var(--color-text-dark);font-size:14px}#messageAllStudentsForm input,#messageAllStudentsForm #messageContent{display:block;width:100%;padding:8px 12px;margin-bottom:10px;border:1px solid var(--color-border-subtle);border-radius:var(--radius-sm);font-family:inherit;font-size:14px;box-sizing:border-box}#messageAllStudentsForm input:focus,#messageAllStudentsForm #messageContent:focus{border-color:var(--color-brand-dark);outline:none;box-shadow:0 0 5px #d354004d}#messageAllStudentsForm #messageContent{font-family:inherit;line-height:1.4;cursor:text;background:#fff}#messageContentWrapper{position:relative}.ce-placeholder{position:absolute;top:8px;left:12px;color:#aaa;pointer-events:none;font-size:14px;font-family:inherit}.ce-placeholder.hidden{display:none}#messageContent img{max-width:100%;height:auto;border-radius:6px;margin:8px 0;display:block}#messageContent img.uploading{opacity:.5;outline:2px dashed var(--color-brand-dark)}.msg-img-wrapper{position:relative;display:inline-block;max-width:100%}.msg-img-wrapper .msg-img-remove{position:absolute;top:4px;right:4px;background:#0009;color:#fff;border:none;border-radius:50%;width:22px;height:22px;font-size:14px;line-height:20px;text-align:center;cursor:pointer;display:none;padding:0}.msg-img-wrapper:hover .msg-img-remove{display:block}#messageAllStudentsStatusMsg{padding:10px;margin:10px 0;border-radius:var(--radius-sm);background-color:var(--color-bg-success);border:1px solid var(--color-bg-success-border);color:var(--color-bg-success-text);font-size:14px}#messageAllStudentsStatusMsg.error{background-color:var(--color-bg-error);border-color:var(--color-bg-error-border);color:var(--color-error-text)}#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:var(--color-brand-dark);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:var(--color-bg-input)}#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:var(--color-bg-light-alt);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 var(--color-border);border-radius:8px;overflow:hidden;box-shadow:0 2px 4px #0000001a}.week-header{background:var(--gradient-brand);color:#fff;padding:15px 20px;font-weight:700;font-size:16px}.week-content{padding:20px}.day-section{margin-bottom:20px;padding:15px;background:var(--color-bg-light-alt);border-radius:6px;border-left:4px solid var(--color-brand-primary)}.day-section h4{margin:0 0 10px;color:var(--color-text-primary);font-size:16px}.lesson-item{padding:12px;margin-bottom:8px;background:#fff;border-radius:4px;border-left:4px solid var(--color-brand-primary);box-shadow:0 1px 3px #0000001a;transition:box-shadow .3s ease}.lesson-item:hover{box-shadow:0 2px 6px #00000026}.lesson-item strong{color:var(--color-text-primary);font-size:15px}.lesson-item .lesson-meta{color:var(--color-text-secondary);font-size:13px;margin-top:4px}.lesson-item .lesson-time{color:var(--color-text-secondary);font-size:12px;text-align:right}.lesson-log-reminder-btn{border:none;background:var(--gradient-brand-warm);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:var(--gradient-success-bold);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:var(--color-bg-input)}#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:var(--color-error-material)}#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 .zoom-trigger-icon svg{width:22px;height:22px;stroke:currentColor;stroke-width:2.2;fill:none;stroke-linecap:round;stroke-linejoin:round}.toolbar-zoom-container .zoom-dropdown{position:absolute;top:calc(100% - 2px);left:auto;right:0;transform:translateY(4px);background:linear-gradient(165deg,#0f172af5,#1e293beb);border-radius:14px;border:1px solid rgba(148,163,184,.4);box-shadow:0 18px 36px #0f172a7a;padding:12px;display:none;flex-direction:column;gap:8px;max-width:calc(100vw - 16px);min-width:min(210px,calc(100vw - 16px));z-index:1200;transition:background .25s ease,box-shadow .25s ease,transform .18s ease,opacity .18s ease;opacity:0;pointer-events:none;overflow:hidden}.toolbar-zoom-container .zoom-dropdown:after{content:"";position:absolute;top:10px;right:10px;bottom:10px;left:10px;border-radius:10px;background:linear-gradient(140deg,#3b82f614,#ec48990d);pointer-events:none;opacity:0;transition:opacity .2s ease}.toolbar-zoom-container.open .zoom-dropdown,.toolbar-zoom-container:hover .zoom-dropdown,.toolbar-zoom-container:focus-within .zoom-dropdown{display:flex;background:linear-gradient(165deg,#111827fa,#1e293bf0);box-shadow:0 26px 44px #0f172a85;transform:translateY(8px);opacity:1;pointer-events:auto}.toolbar-zoom-container.open .zoom-dropdown:after,.toolbar-zoom-container:hover .zoom-dropdown:after,.toolbar-zoom-container:focus-within .zoom-dropdown:after{opacity:1}.toolbar-zoom-container .zoom-dropdown button{position:relative;background:#f8fafc14;border:1px solid rgba(148,163,184,.35);border-radius:10px;color:#f8fafc;font-weight:600;font-size:14px;line-height:1.35;padding:7px 12px;cursor:pointer;transition:background .2s ease,transform .2s ease,border-color .2s ease,box-shadow .2s ease,color .2s ease;text-align:left;white-space:nowrap}.toolbar-zoom-container .zoom-dropdown button:hover,.toolbar-zoom-container .zoom-dropdown button:focus{background:#3b82f638;border-color:#60a5faa6;outline:none;transform:translateY(-1px);box-shadow:0 10px 18px #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:var(--color-brand-dark);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:var(--color-text-primary);text-shadow:0 1px 1px rgba(255,255,255,.5)}.toolbar-icon.active .icon-text{color:#fff;text-shadow:0 1px 1px 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#121b2257;display:none;gap:7px;grid-template-columns:repeat(auto-fit,minmax(var(--topbar-control-size),1fr));max-height:calc(100dvh - var(--topbar-height) - 14px);max-width:calc(100vw - 16px);min-width:0;overflow:auto;padding:8px;position:fixed;right:8px;top:calc(var(--topbar-height) + 8px);width:min(360px,calc(100vw - 16px));z-index:5000}.mobile-toolbar-more.open .mobile-toolbar-menu{display:grid}.mobile-toolbar-scroll-hint{align-items:center;background:linear-gradient(90deg,#3d575e00,#3d575ef5 62%);bottom:0;color:#fff;display:none;justify-content:flex-end;opacity:0;padding-right:8px;pointer-events:none;position:absolute;right:0;top:0;transition:opacity .18s ease;width:calc(var(--topbar-control-size) + 18px);z-index:4700}.mobile-toolbar-scroll-hint:before,.mobile-toolbar-scroll-hint:after{animation:toolbar-scroll-hint-pulse 1.35s ease-in-out infinite;border-right:2px solid currentColor;border-top:2px solid currentColor;content:"";height:8px;margin-left:-2px;transform:rotate(45deg);width:8px}.mobile-toolbar-scroll-hint:after{animation-delay:.18s;opacity:.72}@keyframes toolbar-scroll-hint-pulse{0%,to{opacity:.36;transform:translate(-2px) rotate(45deg)}50%{opacity:1;transform:translate(2px) rotate(45deg)}}@media(max-width:900px),(pointer:coarse){header.mobile-toolbar-scroll-mode{overflow:hidden}header.mobile-toolbar-scroll-mode #leftBar{overflow-x:auto;overflow-y:hidden;overscroll-behavior-x:contain;padding-right:calc(var(--topbar-control-size) + 16px);scrollbar-width:none;-webkit-overflow-scrolling:touch}header.mobile-toolbar-scroll-mode #leftBar::-webkit-scrollbar{display:none}header.mobile-toolbar-scroll-mode #mobileToolbarMoreContainer{display:none!important}header.mobile-toolbar-scroll-mode .mobile-toolbar-scroll-hint{display:flex}header.mobile-toolbar-scroll-mode.mobile-toolbar-can-scroll:not(.mobile-toolbar-at-end) .mobile-toolbar-scroll-hint{opacity:1}}.mobile-toolbar-menu>*{flex:0 0 auto;justify-self:center}.mobile-toolbar-menu .toolbar-icon{height:var(--topbar-control-size);width:var(--topbar-control-size)}.mobile-toolbar-menu .submenu-container{position:relative}header #leftBar.mobile-toolbar-active{gap:max(3px,calc(var(--topbar-gap) * .7))}header #leftBar.mobile-toolbar-active>#currentLessonInfo{max-width:min(22dvw,8rem)!important}header .toolbar-icon{width:var(--topbar-control-size);height:var(--topbar-control-size);min-width:var(--topbar-control-size);border-radius:var(--topbar-radius)}header .icon-text{font-size:var(--topbar-icon-size)}header .toolbar-button-with-text{padding:0 1.767305dvh}.toolbar-button-with-text .icon-text{white-space:nowrap}#customPromptModal .manual-practice-choice-btn{display:inline-flex;align-items:center;justify-content:center;width:auto;min-width:142px;max-width:180px;min-height:42px;padding:8px 14px;border:1px solid var(--color-border-faint, #ccc);border-radius:6px;background:#f1f3f5;color:var(--color-text-primary, #333);box-shadow:0 1px 3px #00000029;cursor:pointer;font-family:Segoe UI,-apple-system,BlinkMacSystemFont,Roboto,Arial,sans-serif;font-size:14px;font-weight:700;line-height:1.2;text-align:center;white-space:normal}#customPromptModal .manual-practice-choice-btn-primary{background:var(--gradient-brand-45, linear-gradient(45deg, #ff9900, #ffcc00));border-color:var(--color-brand-hover, #e68a00)}#customPromptModal .manual-practice-choice-btn:hover,#customPromptModal .manual-practice-choice-btn:focus{transform:translateY(-1px);box-shadow:0 3px 8px #00000038;outline:none}#customPromptModal .manual-practice-choice-label{color:inherit;font:inherit;font-style:normal;text-shadow:none;white-space:normal}@media(max-width:560px){#customPromptModal .manual-practice-choice-btn{flex:1 1 100%;max-width:none}}#customPromptModal .practice-piece-time-modal{width:min(920px,calc(100vw - 32px));max-width:min(920px,calc(100vw - 32px))!important;max-height:calc(100dvh - 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#0003}#minimizeVideoModalBtn:hover{background:linear-gradient(135deg,#5a6268,#343a40);transform:scale(1.05)}#videoModalMinimized{position:fixed;bottom:10px;right:10px;display:flex;align-items:center;gap:8px;background:linear-gradient(135deg,#2d2d2d,#1a1a1a);color:#fff;padding:8px 12px;border-radius:20px;box-shadow:0 4px 12px #0006;z-index:1001;transition:all .2s ease;border:2px solid #e60000}#minimizedRecordingDot{width:12px;height:12px;background:#e60000;border-radius:50%;animation:blinkRedDot 1s infinite;flex-shrink:0}#minimizedRecordingText{font-size:12px;font-weight:700;letter-spacing:1px;color:#f44;flex-shrink:0}#minimizedButtonsContainer{display:flex;align-items:center;gap:4px;margin-left:4px;padding-left:8px;border-left:1px solid rgba(255,255,255,.2)}.minimized-btn{width:32px;height:32px;padding:0;margin:0;border:none;border-radius:6px;font-size:14px;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all .15s ease;box-shadow:0 2px 6px #0006,inset 0 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