.table-container{background:#fff;border-radius:12px;box-shadow:0 1px 3px #0000001a;overflow:hidden;overflow-x:auto}.student-table{width:100%;border-collapse:collapse;font-size:.95rem}.student-table th,.student-table td{padding:1rem 1.25rem;text-align:left}.student-table th{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;font-weight:600;text-transform:uppercase;font-size:.8rem;letter-spacing:.05em}.student-table th:first-child{border-top-left-radius:12px}.student-table th:last-child{border-top-right-radius:12px}.student-table tbody tr{border-bottom:1px solid #e5e7eb;transition:background-color .2s}.student-table tbody tr:hover{background-color:#f9fafb}.student-table tbody tr:last-child{border-bottom:none}.student-table td{color:#4b5563}.student-table td.actions{display:flex;gap:.5rem}.btn-edit,.btn-delete{padding:.5rem .875rem;border-radius:6px;font-size:.875rem;font-weight:500;cursor:pointer;transition:all .2s ease;border:none}.btn-edit{background-color:#dbeafe;color:#1d4ed8}.btn-edit:hover{background-color:#bfdbfe}.btn-delete{background-color:#fee2e2;color:#dc2626}.btn-delete:hover{background-color:#fecaca}.loading-container{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:4rem 2rem;background:#fff;border-radius:12px;box-shadow:0 1px 3px #0000001a}.loading-spinner{width:40px;height:40px;border:4px solid #e5e7eb;border-top-color:#667eea;border-radius:50%;animation:spin 1s linear infinite;margin-bottom:1rem}@keyframes spin{to{transform:rotate(360deg)}}.loading-container p{color:#6b7280;font-size:.95rem}.empty-state{text-align:center;padding:4rem 2rem;background:#fff;border-radius:12px;box-shadow:0 1px 3px #0000001a}.empty-state p{color:#6b7280;font-size:1.1rem}@media (max-width: 768px){.student-table th,.student-table td{padding:.75rem}.student-table{font-size:.875rem}.btn-edit,.btn-delete{padding:.375rem .625rem;font-size:.8rem}}.student-form{display:flex;flex-direction:column;gap:1.25rem}.form-group{display:flex;flex-direction:column;gap:.5rem}.form-group label{font-weight:500;color:#374151;font-size:.9rem}.form-group input{padding:.75rem;border:2px solid #e5e7eb;border-radius:8px;font-size:1rem;transition:border-color .2s,box-shadow .2s;background-color:#fff}.form-group input:focus{outline:none;border-color:#667eea;box-shadow:0 0 0 3px #667eea1a}.form-group input.error{border-color:#ef4444}.form-group input.error:focus{box-shadow:0 0 0 3px #ef44441a}.error-message{color:#ef4444;font-size:.875rem;display:flex;align-items:center;gap:.25rem}.form-actions{display:flex;gap:1rem;justify-content:flex-end;margin-top:1rem;padding-top:1rem;border-top:1px solid #e5e7eb}.btn-cancel,.btn-submit{padding:.75rem 1.5rem;border-radius:8px;font-size:1rem;font-weight:500;cursor:pointer;transition:all .2s ease}.btn-cancel{background-color:#f3f4f6;color:#4b5563;border:1px solid #d1d5db}.btn-cancel:hover{background-color:#e5e7eb}.btn-submit{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;border:none;box-shadow:0 2px 4px #667eea66}.btn-submit:hover{transform:translateY(-1px);box-shadow:0 4px 8px #667eea80}.btn-submit:active{transform:translateY(0)}.modal-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background-color:#00000080;display:flex;justify-content:center;align-items:center;z-index:1000;padding:1rem;animation:fadeIn .2s ease}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}.modal-content{background:#fff;border-radius:12px;width:100%;max-width:500px;max-height:90vh;overflow:hidden;box-shadow:0 20px 25px -5px #0000001a,0 10px 10px -5px #0000000a;animation:slideUp .3s ease}@keyframes slideUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}.modal-header{display:flex;justify-content:space-between;align-items:center;padding:1.25rem 1.5rem;border-bottom:1px solid #e5e7eb;background:linear-gradient(135deg,#667eea,#764ba2);color:#fff}.modal-header h2{margin:0;font-size:1.25rem;font-weight:600}.modal-close{background:none;border:none;color:#fff;font-size:1.5rem;cursor:pointer;padding:.25rem;line-height:1;opacity:.8;transition:opacity .2s}.modal-close:hover{opacity:1}.modal-body{padding:1.5rem;overflow-y:auto}@media (max-width: 640px){.modal-content{max-height:100vh;border-radius:0}.modal-overlay{padding:0;align-items:flex-end}}.app{min-height:100vh;display:flex;flex-direction:column}.app-header{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;padding:1.5rem 2rem;box-shadow:0 2px 4px #0000001a}.app-header h1{font-size:1.75rem;font-weight:600;margin:0}.app-main{flex:1;max-width:1200px;width:100%;margin:0 auto;padding:2rem}.toolbar{margin-bottom:1.5rem}.btn-add{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;border:none;padding:.75rem 1.5rem;font-size:1rem;font-weight:500;border-radius:8px;cursor:pointer;transition:all .2s ease;box-shadow:0 2px 4px #667eea66}.btn-add:hover{transform:translateY(-1px);box-shadow:0 4px 8px #667eea80}.btn-add:active{transform:translateY(0)}.alert{padding:1rem 1.5rem;border-radius:8px;margin-bottom:1.5rem;display:flex;justify-content:space-between;align-items:center;animation:slideIn .3s ease}@keyframes slideIn{0%{opacity:0;transform:translateY(-10px)}to{opacity:1;transform:translateY(0)}}.alert-error{background-color:#fee2e2;border:1px solid #fecaca;color:#dc2626}.alert-success{background-color:#d1fae5;border:1px solid #a7f3d0;color:#059669}.alert button{background:none;border:none;font-size:1.25rem;cursor:pointer;color:inherit;opacity:.6;transition:opacity .2s}.alert button:hover{opacity:1}@media (max-width: 768px){.app-main{padding:1rem}.app-header h1{font-size:1.5rem}}*{box-sizing:border-box;margin:0;padding:0}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}