*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;background-color:#f5f5f5;color:#333}.app{min-height:100vh}.header{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;padding:1rem 2rem;box-shadow:0 2px 10px #0000001a}.header h1{margin-bottom:1rem;font-size:2rem;font-weight:600}.header nav{display:flex;gap:1rem}.header button{background:#fff3;border:1px solid rgba(255,255,255,.3);color:#fff;padding:.5rem 1rem;border-radius:6px;cursor:pointer;transition:all .2s}.header button:hover{background:#ffffff4d;transform:translateY(-1px)}main{padding:2rem;max-width:1200px;margin:0 auto}.loading{text-align:center;padding:2rem;font-size:1.2rem;color:#666}.error{background:#fee;color:#c33;padding:1rem;border-radius:6px;margin:1rem 0;border:1px solid #fcc}.auth-container{max-width:400px;margin:4rem auto;background:#fff;padding:2rem;border-radius:12px;box-shadow:0 4px 20px #0000001a}.auth-container h2{text-align:center;margin-bottom:2rem;color:#333}.auth-form .form-group{margin-bottom:1.5rem}.auth-form label{display:block;margin-bottom:.5rem;font-weight:500;color:#555}.auth-form input{width:100%;padding:.75rem;border:2px solid #e1e5e9;border-radius:6px;font-size:1rem;transition:border-color .2s}.auth-form input:focus{outline:none;border-color:#667eea}.btn-primary{width:100%;background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;border:none;padding:.75rem;border-radius:6px;font-size:1rem;font-weight:500;cursor:pointer;transition:all .2s}.btn-primary:hover:not(:disabled){transform:translateY(-1px);box-shadow:0 4px 15px #667eea66}.btn-primary:disabled{opacity:.6;cursor:not-allowed}.auth-switch{text-align:center;margin-top:1.5rem;color:#666}.btn-link{background:none;border:none;color:#667eea;text-decoration:underline;cursor:pointer;font-size:inherit}.btn-link:hover{color:#5a6fd8}.dashboard{background:#fff;border-radius:12px;box-shadow:0 2px 10px #0000001a;overflow:hidden}.dashboard-header{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;padding:2rem;text-align:center}.dashboard-header h2{margin-bottom:.5rem;font-size:1.8rem}.dashboard-header p{margin-bottom:1.5rem;opacity:.9}.header-actions{display:flex;gap:1rem;justify-content:center;flex-wrap:wrap;margin-top:1rem}.header-actions button{min-width:160px;padding:.75rem 1.5rem;border:none;border-radius:6px;font-size:.9rem;font-weight:500;cursor:pointer;transition:all .2s;white-space:nowrap}.header-actions .btn-secondary{background:#fff3;color:#fff;border:1px solid rgba(255,255,255,.3)}.header-actions .btn-secondary:hover:not(:disabled){background:#ffffff4d;transform:translateY(-1px)}.header-actions .btn-info{background:#17a2b8cc;color:#fff}.header-actions .btn-info:hover{background:#17a2b8;transform:translateY(-1px)}.header-actions .btn-danger{background:#dc3545cc;color:#fff}.btn-danger{background:#dc3545;color:#fff;border:none;padding:.5rem 1rem;border-radius:6px;cursor:pointer;transition:all .2s}.btn-danger:hover{background:#c82333;transform:translateY(-1px)}.btn-warning{background:#ffc107;color:#212529;border:none;padding:.5rem 1rem;border-radius:6px;cursor:pointer;transition:all .2s}.btn-warning:hover{background:#e0a800;transform:translateY(-1px)}.btn-info{background:#17a2b8;color:#fff;border:none;padding:.5rem 1rem;border-radius:6px;cursor:pointer;transition:all .2s}.btn-info:hover{background:#138496;transform:translateY(-1px)}.dashboard-tabs{display:flex;background:#f8f9fa;border-bottom:1px solid #e9ecef}.tab{flex:1;background:none;border:none;padding:1rem;cursor:pointer;transition:all .2s;font-weight:500;color:#666}.tab.active{background:#fff;color:#667eea;border-bottom:3px solid #667eea}.tab:hover:not(.active){background:#e9ecef}.dashboard-content{padding:2rem}.subject-manager h3{margin-bottom:1.5rem;color:#333}.add-subject-form{margin-bottom:2rem}.form-row{display:flex;gap:1rem;align-items:center}.subject-input{flex:1;padding:.75rem;border:2px solid #e1e5e9;border-radius:6px;font-size:1rem}.subject-input:focus{outline:none;border-color:#667eea}.subjects-list h4{margin-bottom:1rem;color:#555}.no-subjects{color:#666;font-style:italic;text-align:center;padding:2rem}.subjects-grid{display:grid;gap:1rem}.subject-item{display:flex;justify-content:space-between;align-items:center;padding:1rem;background:#f8f9fa;border-radius:6px;border:1px solid #e9ecef}.btn-small{padding:.25rem .5rem;font-size:.875rem}.timetable-manager h3{margin-bottom:1.5rem;color:#333}.timetable-container{overflow-x:auto;margin-bottom:2rem}.period-header,.period-cell{min-width:80px;width:80px;text-align:center;white-space:nowrap;font-weight:600;background:#f8f9fa;border-right:2px solid #dee2e6}.period-header{background:#e9ecef;font-weight:700}.timetable-table{border-collapse:collapse;width:100%;margin:1rem 0;box-shadow:0 2px 8px #0000001a}.timetable-table th,.timetable-table td{border:1px solid #dee2e6;padding:.75rem;text-align:center;vertical-align:middle}.timetable-table th{background:#f8f9fa;font-weight:600;color:#495057}.timetable-table td{background:#fff;min-height:60px}.timetable-cell{position:relative;min-width:120px;height:60px;vertical-align:middle}.subject-slot{display:flex;flex-direction:column;align-items:center;gap:.25rem;height:100%;justify-content:center}.subject-name{font-weight:500;color:#333}.subject-select{width:100%;padding:.5rem;border:1px solid #e1e5e9;border-radius:4px;background:#fff;cursor:pointer}.btn-clear{background:#dc3545;color:#fff;border:none;border-radius:50%;width:20px;height:20px;cursor:pointer;font-size:14px;line-height:1}.btn-clear:hover{background:#c82333}.timetable-actions{text-align:center}.btn-secondary{background:#6c757d;color:#fff;border:none;padding:.75rem 1.5rem;border-radius:6px;cursor:pointer;transition:all .2s}.btn-secondary:hover:not(:disabled){background:#5a6268;transform:translateY(-1px)}.view-timetable h2{margin-bottom:2rem;color:#333;text-align:center}.class-selector{text-align:center;margin-bottom:2rem}.class-selector label{display:block;margin-bottom:.5rem;font-weight:500;color:#555}.class-select{padding:.75rem 1rem;border:2px solid #e1e5e9;border-radius:6px;font-size:1rem;min-width:200px;cursor:pointer}.class-select:focus{outline:none;border-color:#667eea}.auto-selected-note{color:#28a745;font-size:.9rem;margin-top:.5rem;font-style:italic}.timetable-info{text-align:center;margin-bottom:2rem;padding:1rem;background:#f8f9fa;border-radius:6px}.timetable-info h3{margin-bottom:.5rem;color:#333}.view-table .timetable-cell{height:50px;vertical-align:middle}.view-cell{font-weight:500;color:#333}.no-timetable{text-align:center;padding:3rem;color:#666;font-style:italic}.student-dashboard{max-width:1200px;margin:0 auto;padding:2rem}.notification-center{position:fixed;top:50%;left:50%;transform:translate(-50%,-50%);width:90%;max-width:600px;max-height:80vh;background:#fff;border-radius:12px;box-shadow:0 20px 40px #0000004d;z-index:1000;overflow:hidden}.notification-header{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;padding:1.5rem;display:flex;justify-content:space-between;align-items:center}.notification-header h3{margin:0;font-size:1.5rem}.close-btn{background:none;border:none;color:#fff;font-size:2rem;cursor:pointer;padding:0;width:40px;height:40px;display:flex;align-items:center;justify-content:center;border-radius:50%;transition:background-color .2s}.close-btn:hover{background-color:#fff3}.notification-content{padding:1.5rem;max-height:60vh;overflow-y:auto}.notifications-list{display:flex;flex-direction:column;gap:1rem}.notification-item{display:flex;gap:1rem;padding:1rem;border-radius:8px;border:1px solid #e9ecef;background:#f8f9fa;transition:all .2s}.notification-item:hover{background:#e9ecef;transform:translateY(-1px)}.notification-item.timetable_change{border-left:4px solid #dc3545;background:#fff5f5}.notification-item.email_notification{border-left:4px solid #ffc107;background:#fffbf0}.notification-icon{font-size:1.5rem;flex-shrink:0}.notification-content{flex:1}.notification-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:.5rem}.notification-header h4{margin:0;color:#333;font-size:1.1rem}.timestamp{font-size:.9rem;color:#666}.notification-message{margin:.5rem 0;color:#555;line-height:1.4}.notification-meta{display:flex;gap:1rem;align-items:center;margin-top:.5rem}.class-section{background:#e9ecef;padding:.25rem .5rem;border-radius:4px;font-size:.8rem;color:#495057}.priority-badge{color:#fff;padding:.25rem .5rem;border-radius:4px;font-size:.7rem;text-transform:uppercase;font-weight:700}.no-notifications{text-align:center;padding:3rem 1rem;color:#666}.sub-text{font-size:.9rem;margin-top:.5rem;opacity:.7}.notification-actions{display:flex;gap:1rem;justify-content:center;margin-top:2rem;padding-top:1rem;border-top:1px solid #e9ecef}.loading{text-align:center;padding:2rem;color:#666}.student-dashboard .dashboard-header{text-align:center;margin-bottom:3rem}.student-dashboard .dashboard-header h2{font-size:2.5rem;margin-bottom:1rem;color:#333}.student-dashboard .dashboard-content{display:grid;gap:3rem}.registered-classes,.available-classes{background:#fff;padding:2rem;border-radius:12px;box-shadow:0 4px 6px #0000001a}.registered-classes h3,.available-classes h3{font-size:1.5rem;margin-bottom:1.5rem;color:#333;text-align:center}.section-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:1.5rem}.section-header h3{margin:0}.refresh-btn{padding:6px 12px;font-size:12px;background:#f8f9fa;border:1px solid #dee2e6;border-radius:4px;cursor:pointer;transition:all .2s}.classes-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:1.5rem}.class-card{background:#f8f9fa;padding:1.5rem;border-radius:8px;border:2px solid #e9ecef;transition:all .3s ease}.class-card:hover{transform:translateY(-2px);box-shadow:0 6px 12px #00000026}.class-card h4{font-size:1.3rem;margin-bottom:.5rem;color:#333}.class-card p{color:#666;margin-bottom:.5rem}.class-card.available{border-color:#28a745;background:#f8fff9}.class-actions{display:flex;gap:1rem;margin-top:1rem}.no-classes{text-align:center;color:#666;font-style:italic;padding:2rem}.student-timetable-view{max-width:1200px;margin:0 auto;padding:2rem}.timetable-header{display:flex;align-items:center;gap:2rem;margin-bottom:2rem}.timetable-header h2{margin:0;color:#333}.success-message{background:#d4edda;color:#155724;padding:1rem;border-radius:6px;margin-bottom:1rem;text-align:center;border:1px solid #c3e6cb}.error-message{background:#f8d7da;color:#721c24;padding:1rem;border-radius:6px;margin-bottom:1rem;text-align:center;border:1px solid #f5c6cb}.welcome-section{text-align:center;padding:3rem 0}.welcome-content{max-width:700px;margin:0 auto 2rem}.welcome-content h2{font-size:3rem;margin-bottom:1.5rem;color:#333;background:linear-gradient(135deg,#667eea,#764ba2);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;font-weight:700}.welcome-content p{font-size:1.3rem;color:#666;margin-bottom:2rem;line-height:1.7;max-width:500px;margin-left:auto;margin-right:auto}.welcome-actions{display:flex;gap:2rem;justify-content:center;flex-wrap:wrap;margin-top:2rem}.welcome-actions .btn-primary,.welcome-actions .btn-secondary{padding:0;border:none;border-radius:10px;font-size:1.1rem;font-weight:600;cursor:pointer;transition:all .3s ease;width:220px;height:60px;text-transform:uppercase;letter-spacing:.8px;box-shadow:0 4px 15px #0000001a;position:relative;overflow:hidden;display:flex;align-items:center;justify-content:center;text-decoration:none;line-height:1}.welcome-actions .btn-primary{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;border:2px solid transparent}.welcome-actions .btn-secondary{background:linear-gradient(135deg,#6c757d,#495057);color:#fff;border:2px solid transparent}.welcome-actions .btn-primary:hover,.welcome-actions .btn-secondary:hover{transform:translateY(-4px);box-shadow:0 8px 25px #0003;border-color:#ffffff4d}.welcome-actions .btn-primary:active,.welcome-actions .btn-secondary:active{transform:translateY(-2px);box-shadow:0 4px 15px #0003}.welcome-actions .btn-primary:before,.welcome-actions .btn-secondary:before{content:"";position:absolute;top:0;left:-100%;width:100%;height:100%;background:linear-gradient(90deg,transparent,rgba(255,255,255,.2),transparent);transition:left .5s}.welcome-actions .btn-primary:hover:before,.welcome-actions .btn-secondary:hover:before{left:100%}.credit-text{position:fixed;bottom:1rem;right:1rem;padding:.75rem 1rem;background:#fffffff2;border-radius:8px;box-shadow:0 2px 10px #0000001a;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border:1px solid rgba(255,255,255,.2);z-index:1000}.credit-text p{font-size:.875rem;color:#666;margin:0;font-style:italic;white-space:nowrap}.credit-text strong{color:#667eea;font-weight:600}.current-week-info{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;padding:1.5rem;border-radius:12px;margin:1.5rem 0;text-align:center;box-shadow:0 4px 15px #667eea4d}.current-week-info h3{margin:0 0 .5rem;font-size:1.5rem;font-weight:600}.week-note{margin:0;opacity:.9;font-size:.9rem}.day-header{display:flex;flex-direction:column;align-items:center;gap:.25rem}.day-name{font-weight:600;font-size:1rem}.day-date{font-size:.8rem;opacity:.8;font-weight:400}.today{background:linear-gradient(135deg,#ffecd2,#fcb69f)!important;color:#d63384!important;font-weight:600}.today .day-date{color:#d63384!important;opacity:1}.timetable-table th.today{background:linear-gradient(135deg,#ffecd2,#fcb69f);color:#d63384;border:2px solid #fcb69f}.timetable-table td.today{background:#ffecd24d;border:1px solid #fcb69f}@media (max-width: 768px){.header{padding:1rem}.header nav{flex-direction:column;gap:.5rem}main{padding:1rem}.welcome-content h2{font-size:2rem}.welcome-actions{flex-direction:column;align-items:center;gap:1rem}.welcome-actions .btn-primary,.welcome-actions .btn-secondary{min-width:200px}.class-section-selector,.auth-actions,.form-row{flex-direction:column;gap:.5rem}.timetable-table{font-size:.875rem}.timetable-table th,.timetable-table td{padding:.5rem .25rem}.timetable-cell{min-width:80px;height:50px}}.auth-actions{display:flex;align-items:center;justify-content:center;gap:1rem;margin-top:1.5rem}.auth-divider{color:#ccc;font-weight:300}.success{background:#d4edda;color:#155724;padding:1rem;border-radius:6px;margin:1rem 0;border:1px solid #c3e6cb}.class-section-selector{display:flex;gap:1rem;align-items:center}.grade-select,.section-select{flex:1;padding:.75rem;border:2px solid #e1e5e9;border-radius:6px;font-size:1rem;background:#fff;cursor:pointer;transition:border-color .2s}.grade-select:focus,.section-select:focus{outline:none;border-color:#667eea}.section-select:disabled{background:#f8f9fa;cursor:not-allowed;opacity:.6}.selected-class{margin-top:.5rem;padding:.5rem;background:#e3f2fd;border-radius:4px;text-align:center;font-size:.875rem;color:#1976d2}.header-actions .btn-danger:hover{background:#dc3545;transform:translateY(-1px)}