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.summary-amount{color:#667eea;font-size:22px}.invoice-form{background:#fff;border-radius:16px;padding:24px;margin-bottom:24px;box-shadow:0 2px 8px #0000000d;display:flex;flex-direction:column;align-items:center;gap:16px}.confirm-checkbox{display:flex;align-items:center;gap:10px;font-size:14px;color:#333;cursor:pointer}.confirm-checkbox input[type=checkbox]{width:18px;height:18px;accent-color:#667eea}.submit-invoice-btn{padding:12px 32px;background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;border:none;border-radius:8px;font-size:16px;font-weight:600;cursor:pointer;transition:all .2s}.submit-invoice-btn:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 4px 12px #667eea4d}.submit-invoice-btn:disabled{opacity:.5;cursor:not-allowed;transform:none}.invoice-not-ready{background:#fff3e0;border:1px solid #ffe0b2;border-radius:12px;padding:16px;text-align:center;font-size:14px;color:#e65100;margin-bottom:24px}.invoice-submitted-badge{background:#e8f5e9;color:#2e7d32;border:1px solid #a5d6a7;border-radius:12px;padding:16px;text-align:center;font-size:16px;font-weight:600;margin-bottom:24px}.billing-table-container{background:#fff;border-radius:16px;overflow:hidden;box-shadow:0 2px 8px #0000000d;margin-bottom:24px}.billing-table{width:100%;border-collapse:collapse}.billing-table thead{background:#f8f9fa}.billing-table th{padding:14px 16px;text-align:left;font-size:13px;font-weight:600;color:#666;border-bottom:2px solid #e0e0e0}.billing-table td{padding:14px 16px;font-size:14px;color:#333;border-bottom:1px solid #f0f0f0}.billing-table tbody tr:last-child td{border-bottom:none}.billing-table tbody tr:hover{background:#f8f9fa}.text-right{text-align:right}.billing-error{background:#fee;border:1px solid #fcc;border-radius:8px;padding:16px;margin-bottom:24px;color:#c33;font-size:14px;text-align:center}.billing-loading{text-align:center;padding:48px;font-size:16px;color:#666}.billing-empty{background:#fff;border-radius:16px;padding:48px;text-align:center;color:#666;font-size:15px;box-shadow:0 2px 8px #0000000d;margin-bottom:24px}@media(max-width:768px){.billing-container{padding:24px 16px}.billing-header h1{font-size:24px}.month-selector{gap:16px}.month-label{font-size:18px}.summary-row{flex-direction:column;gap:12px}.billing-table-container{overflow-x:auto}.billing-table{min-width:500px}}.teacher-header{background:linear-gradient(135deg,#667eea,#764ba2);border-bottom:1px solid rgba(255,255,255,.1);position:sticky;top:0;z-index:100;box-shadow:0 4px 12px #00000026}.teacher-header-container{max-width:1200px;margin:0 auto;padding:16px 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#0003}.online-status-toggle:disabled{opacity:.6;cursor:not-allowed}.online-status-toggle .status-indicator{width:10px;height:10px;border-radius:50%;background:#fff;animation:pulse 2s infinite}@keyframes pulse{0%,to{opacity:1}50%{opacity:.5}}.online-status-toggle .status-label{font-size:14px}.teacher-header .user-menu-container{position:relative}.teacher-header .user-menu-button{display:flex;align-items:center;gap:12px;padding:8px 16px;background:#ffffff26;border:2px solid rgba(255,255,255,.3);border-radius:24px;cursor:pointer;transition:all .2s;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.teacher-header .user-menu-button:hover{background:#ffffff40;border-color:#ffffff80;transform:translateY(-2px)}.teacher-header .user-avatar{width:32px;height:32px;border-radius:50%;background:#fff;display:flex;align-items:center;justify-content:center;color:#667eea;font-weight:600;font-size:14px;overflow:hidden}.teacher-header .user-avatar 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.dropdown-user-email{font-size:12px;opacity:.9}.teacher-header .dropdown-user-role{font-size:12px;margin-top:4px;padding:4px 8px;background:#fff3;border-radius:4px;display:inline-block;width:fit-content}.teacher-header .dropdown-divider{height:1px;background:#e0e0e0;margin:8px 0}.teacher-header .dropdown-item{display:flex;align-items:center;gap:12px;padding:12px 16px;color:#333;text-decoration:none;cursor:pointer;transition:background .2s;border:none;background:none;width:100%;text-align:left;font-size:14px}.teacher-header .dropdown-item:hover{background:#f5f5f5}.teacher-header .dropdown-item.logout{color:#c33}.teacher-header .dropdown-item.logout:hover{background:#fee}.teacher-header .dropdown-icon{font-size:16px;width:20px;text-align:center}@media(max-width:768px){.teacher-header-container{padding:12px 16px}.teacher-header-logo .logo-text{font-size:20px}.teacher-badge{font-size:10px;padding:3px 8px}.teacher-header .user-name{display:none}}.incoming-call-modal-overlay{position:fixed;inset:0;background-color:#000000b3;display:flex;align-items:center;justify-content:center;z-index:10000;animation:fadeIn .2s ease-in}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}.incoming-call-modal{background:#fff;border-radius:16px;padding:40px;max-width:500px;width:90%;max-height:90vh;overflow-y:auto;text-align:center;box-shadow:0 10px 40px #0000004d;animation:slideUp .3s ease-out}@keyframes slideUp{0%{transform:translateY(20px);opacity:0}to{transform:translateY(0);opacity:1}}.incoming-call-icon{font-size:64px;margin-bottom:20px;animation:ring 1s ease-in-out infinite}@keyframes ring{0%,to{transform:rotate(0)}10%,30%{transform:rotate(-10deg)}20%,40%{transform:rotate(10deg)}}.incoming-call-modal h2{margin:0 0 16px;font-size:24px;color:#333}.caller-name{font-size:20px;font-weight:700;color:#2196f3;margin:8px 0}.call-message{color:#666;margin:8px 0 24px}.call-history{margin:20px 0 0;padding:15px;background:#f5f5f5;border-radius:8px;text-align:left;max-height:200px;overflow-y:auto}.call-history h3{margin:0 0 10px;font-size:16px;color:#333}.history-stats{display:flex;flex-direction:column;gap:8px;margin-bottom:15px}.stat-item{display:flex;justify-content:space-between;font-size:14px}.stat-label{color:#666}.stat-value{font-weight:700;color:#333}.recent-notes{margin-top:15px;padding-top:15px;border-top:1px solid #ddd}.recent-notes h4{margin:0 0 10px;font-size:14px;color:#666}.note-item{margin-bottom:10px;padding:8px;background:#fff;border-radius:4px;font-size:13px}.note-item:last-child{margin-bottom:0}.note-date{color:#999;margin-bottom:4px}.note-content{color:#333;line-height:1.4}.loading-stats{margin:20px 0 0;color:#999;font-size:14px}.incoming-call-actions{display:flex;gap:16px;justify-content:center;margin-top:0}.incoming-call-actions button{flex:1;padding:16px 24px;border:none;border-radius:8px;font-size:16px;font-weight:700;cursor:pointer;transition:all .2s}.incoming-call-actions button:disabled{opacity:.5;cursor:not-allowed}.reject-button{background-color:#f44336;color:#fff}.reject-button:hover:not(:disabled){background-color:#d32f2f;transform:translateY(-2px);box-shadow:0 4px 12px #f443364d}.accept-button{background-color:#4caf50;color:#fff}.accept-button:hover:not(:disabled){background-color:#45a049;transform:translateY(-2px);box-shadow:0 4px 12px #4caf504d}@media(max-width:768px){.incoming-call-modal{padding:30px 20px}.incoming-call-actions{flex-direction:column}.incoming-call-actions button{width:100%}}#root{width:100%;min-height:100vh;background:#f8f9fa}