:root{--primary-50: #eef6ff;--primary-100: #d9eaff;--primary-200: #bcdaff;--primary-300: #8ec2ff;--primary-400: #599fff;--primary-500: #2f7bf6;--primary-600: #1a5fe0;--primary-700: #1749b4;--primary-800: #173d91;--primary-900: #183672;--success-50: #ecfdf5;--success-100: #d1fae5;--success-500: #10b981;--success-600: #059669;--success-700: #047857;--warning-50: #fffbeb;--warning-100: #fef3c7;--warning-500: #f59e0b;--warning-600: #d97706;--error-50: #fef2f2;--error-100: #fee2e2;--error-500: #ef4444;--error-600: #dc2626;--neutral-0: #ffffff;--neutral-50: #f8fafc;--neutral-100: #f1f5f9;--neutral-200: #e2e8f0;--neutral-300: #cbd5e1;--neutral-400: #94a3b8;--neutral-500: #64748b;--neutral-600: #475569;--neutral-700: #334155;--neutral-800: #1e293b;--neutral-900: #0f172a;--accent-500: #0ea5e9;--accent-600: #0284c7;--radius-sm: 6px;--radius-md: 10px;--radius-lg: 16px;--shadow-sm: 0 1px 2px rgba(15, 23, 42, .06);--shadow-md: 0 4px 12px rgba(15, 23, 42, .08);--shadow-lg: 0 12px 32px rgba(15, 23, 42, .12);font-family:Inter,system-ui,-apple-system,Avenir,Helvetica,Arial,sans-serif;line-height:1.5;font-weight:400;color:var(--neutral-800);background-color:var(--neutral-100);font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}*{box-sizing:border-box}body{margin:0;min-height:100vh;background:linear-gradient(135deg,var(--neutral-100) 0%,var(--primary-50) 100%)}#app{max-width:1200px;margin:0 auto;padding:2rem 1.5rem}.app-header{display:flex;align-items:center;justify-content:space-between;gap:1rem;margin-bottom:2rem;flex-wrap:wrap}.app-header h1{margin:0;font-size:1.75rem;font-weight:700;color:var(--neutral-900);line-height:1.2}.brand{display:flex;align-items:center;gap:.75rem}.brand-logo{width:48px;height:48px;border-radius:var(--radius-md);object-fit:cover;box-shadow:var(--shadow-sm);border:1px solid var(--neutral-200)}.app-header .subtitle{margin:.25rem 0 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ease}.stat-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-md)}.stat-card .stat-label{font-size:.78rem;font-weight:600;color:var(--neutral-500);text-transform:uppercase;letter-spacing:.04em;margin-bottom:.35rem}.stat-card .stat-value{font-size:1.5rem;font-weight:700;color:var(--neutral-900);line-height:1.1}.stat-card .stat-value.accent{color:var(--primary-600)}.stat-card .stat-value.success{color:var(--success-600)}.stat-card .stat-value.warning{color:var(--warning-600)}.stat-card .stat-value.error{color:var(--error-600)}.toolbar{display:flex;gap:.75rem;margin-bottom:1.5rem;flex-wrap:wrap;align-items:center}.search-box{flex:1;min-width:200px;position:relative}.search-box input{width:100%;padding:.65rem .9rem .65rem 2.4rem;border:1px solid var(--neutral-300);border-radius:var(--radius-md);font-size:.9rem;font-family:inherit;background:var(--neutral-0);transition:border-color .2s,box-shadow .2s}.search-box input:focus{outline:none;border-color:var(--primary-500);box-shadow:0 0 0 3px var(--primary-100)}.search-box .search-icon{position:absolute;left:.75rem;top:50%;transform:translateY(-50%);color:var(--neutral-400);font-size:.95rem}.filter-select{padding:.65rem .9rem;border:1px solid var(--neutral-300);border-radius:var(--radius-md);font-size:.9rem;font-family:inherit;background:var(--neutral-0);color:var(--neutral-700);cursor:pointer;transition:border-color .2s}.filter-select:focus{outline:none;border-color:var(--primary-500);box-shadow:0 0 0 3px var(--primary-100)}.btn{display:inline-flex;align-items:center;gap:.45rem;padding:.6rem 1.1rem;border-radius:var(--radius-md);font-size:.88rem;font-weight:600;font-family:inherit;cursor:pointer;border:1px solid transparent;transition:all .2s ease;white-space:nowrap}.btn-primary{background:var(--primary-600);color:#fff;box-shadow:var(--shadow-sm)}.btn-primary:hover{background:var(--primary-700);transform:translateY(-1px);box-shadow:var(--shadow-md)}.btn-secondary{background:var(--neutral-0);color:var(--neutral-700);border-color:var(--neutral-300)}.btn-secondary:hover{background:var(--neutral-50);border-color:var(--neutral-400)}.btn-success{background:var(--success-600);color:#fff}.btn-success:hover{background:var(--success-700);transform:translateY(-1px)}.btn-ghost{background:transparent;color:var(--neutral-600);padding:.4rem .6rem}.btn-ghost:hover{background:var(--neutral-100);color:var(--neutral-800)}.btn-danger{background:transparent;color:var(--error-600);border-color:var(--error-100)}.btn-danger:hover{background:var(--error-50)}.btn:disabled{opacity:.5;cursor:not-allowed}.btn-sm{padding:.4rem .7rem;font-size:.8rem}.table-card{background:var(--neutral-0);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);border:1px solid var(--neutral-200);overflow:hidden}.table-wrapper{overflow-x:auto}table{width:100%;border-collapse:collapse;font-size:.88rem}thead{background:var(--neutral-50);border-bottom:1px solid var(--neutral-200)}th{text-align:left;padding:.85rem 1rem;font-weight:600;color:var(--neutral-600);font-size:.78rem;text-transform:uppercase;letter-spacing:.03em;white-space:nowrap}td{padding:.85rem 1rem;border-bottom:1px solid var(--neutral-100);color:var(--neutral-700)}tbody tr{transition:background .15s ease}tbody tr:hover{background:var(--primary-50)}tbody tr:last-child td{border-bottom:none}.roll-no{font-weight:600;color:var(--neutral-900);font-variant-numeric:tabular-nums}.student-name{font-weight:500;color:var(--neutral-900)}.badge{display:inline-block;padding:.2rem .6rem;border-radius:999px;font-size:.75rem;font-weight:600}.badge-day{background:var(--accent-500);color:#fff}.badge-hostel{background:var(--primary-600);color:#fff}.badge-loan{background:var(--warning-100);color:var(--warning-600)}.badge-noloan{background:var(--neutral-100);color:var(--neutral-500)}.fee-amount{font-variant-numeric:tabular-nums;text-align:right}.paid-status{font-weight:600}.paid-full{color:var(--success-600)}.paid-partial{color:var(--warning-600)}.paid-pending{color:var(--error-600)}.row-actions{display:flex;gap:.3rem}.empty-state{text-align:center;padding:3rem 1rem;color:var(--neutral-500)}.empty-state .empty-icon{font-size:2.5rem;margin-bottom:.5rem}.modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#0f172a80;display:flex;align-items:center;justify-content:center;z-index:100;padding:1rem;animation:fadeIn .2s ease}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}.modal{background:var(--neutral-0);border-radius:var(--radius-lg);box-shadow:var(--shadow-lg);width:100%;max-width:600px;max-height:90vh;overflow-y:auto;animation:slideUp .25s ease}@keyframes slideUp{0%{transform:translateY(20px);opacity:0}to{transform:translateY(0);opacity:1}}.modal-header{display:flex;align-items:center;justify-content:space-between;padding:1.25rem 1.5rem;border-bottom:1px solid var(--neutral-200)}.modal-header h2{margin:0;font-size:1.2rem;font-weight:700;color:var(--neutral-900)}.modal-close{background:none;border:none;font-size:1.4rem;color:var(--neutral-400);cursor:pointer;padding:.25rem .5rem;line-height:1;border-radius:var(--radius-sm);transition:background .15s,color .15s}.modal-close:hover{background:var(--neutral-100);color:var(--neutral-700)}.modal-body{padding:1.5rem}.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:1rem}.form-grid .full{grid-column:1 / -1}.form-group{display:flex;flex-direction:column;gap:.35rem}.form-group label{font-size:.82rem;font-weight:600;color:var(--neutral-700)}.form-group input,.form-group select,.form-group textarea{padding:.6rem .8rem;border:1px solid var(--neutral-300);border-radius:var(--radius-md);font-size:.88rem;font-family:inherit;background:var(--neutral-0);color:var(--neutral-800);transition:border-color .2s,box-shadow .2s}.form-group input:focus,.form-group select:focus,.form-group textarea:focus{outline:none;border-color:var(--primary-500);box-shadow:0 0 0 3px var(--primary-100)}.form-group input:disabled{background:var(--neutral-100);color:var(--neutral-400);cursor:not-allowed}.form-group .hint{font-size:.75rem;color:var(--neutral-500)}.checkbox-group{display:flex;align-items:center;gap:.5rem;padding:.6rem .8rem;background:var(--neutral-50);border-radius:var(--radius-md);border:1px solid var(--neutral-200)}.checkbox-group input[type=checkbox]{width:18px;height:18px;cursor:pointer;accent-color:var(--primary-600)}.checkbox-group label{font-size:.88rem;cursor:pointer;color:var(--neutral-700)}.fee-summary{margin-top:.5rem;padding:1rem;background:var(--primary-50);border-radius:var(--radius-md);border:1px solid var(--primary-100)}.fee-summary .summary-row{display:flex;justify-content:space-between;padding:.25rem 0;font-size:.88rem;color:var(--neutral-700)}.fee-summary .summary-total{border-top:1px solid var(--primary-200);margin-top:.5rem;padding-top:.5rem;font-weight:700;font-size:1rem;color:var(--primary-700)}.modal-footer{display:flex;justify-content:flex-end;gap:.6rem;padding:1rem 1.5rem;border-top:1px solid var(--neutral-200)}.toast-container{position:fixed;bottom:1.5rem;right:1.5rem;z-index:200;display:flex;flex-direction:column;gap:.5rem}.toast{padding:.75rem 1.1rem;border-radius:var(--radius-md);font-size:.85rem;font-weight:500;color:#fff;box-shadow:var(--shadow-md);animation:toastIn .25s ease;max-width:340px}.toast-success{background:var(--success-600)}.toast-error{background:var(--error-600)}.toast-info{background:var(--primary-600)}@keyframes toastIn{0%{transform:translate(40px);opacity:0}to{transform:translate(0);opacity:1}}.loading-overlay{display:flex;align-items:center;justify-content:center;padding:3rem;color:var(--neutral-500)}.spinner{width:32px;height:32px;border:3px solid var(--neutral-200);border-top-color:var(--primary-500);border-radius:50%;animation:spin .7s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.nptel-section{margin-top:2rem;background:var(--neutral-0);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);border:1px solid var(--neutral-200);overflow:hidden}.nptel-section-header{display:flex;align-items:center;justify-content:space-between;padding:1.25rem 1.5rem;border-bottom:1px solid var(--neutral-200);background:var(--neutral-50);gap:1rem;flex-wrap:wrap}.nptel-section-title{margin:0;font-size:1.15rem;font-weight:700;color:var(--neutral-900)}.nptel-section-sub{margin:.2rem 0 0;font-size:.82rem;color:var(--neutral-500)}.nptel-add-row{padding:1.25rem 1.5rem;border-bottom:1px solid var(--neutral-100);background:var(--primary-50)}.nptel-add-row .form-group label{font-size:.85rem;font-weight:600;color:var(--neutral-700)}.nptel-add-row input{flex:1;padding:.6rem .9rem;border:1px solid var(--neutral-300);border-radius:var(--radius-md);font-size:.88rem;font-family:inherit;background:var(--neutral-0);transition:border-color .2s,box-shadow .2s}.nptel-add-row input:focus{outline:none;border-color:var(--primary-500);box-shadow:0 0 0 3px var(--primary-100)}#nptelCourseList{padding:1rem 1.5rem 1.5rem}.nptel-course-card{border:1px solid var(--neutral-200);border-radius:var(--radius-md);padding:1rem 1.1rem;margin-bottom:.75rem;background:var(--neutral-50);transition:box-shadow .2s}.nptel-course-card:last-child{margin-bottom:0}.nptel-course-card:hover{box-shadow:var(--shadow-md)}.nptel-card-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:.75rem;gap:.5rem;flex-wrap:wrap}.nptel-course-name{font-size:.95rem;color:var(--neutral-900)}.nptel-weeks-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(88px,1fr));gap:.4rem}.week-checkbox-label{display:flex;align-items:center;gap:.35rem;padding:.4rem .6rem;background:var(--neutral-0);border-radius:var(--radius-sm);border:1px solid var(--neutral-200);font-size:.8rem;color:var(--neutral-600);cursor:pointer;transition:background .15s,border-color .15s,color .15s;-webkit-user-select:none;user-select:none}.week-checkbox-label:hover{border-color:var(--primary-400);background:var(--primary-50)}.week-checkbox-label input[type=checkbox]{width:15px;height:15px;flex-shrink:0;accent-color:var(--success-600);cursor:pointer}.week-checkbox-label.week-done{background:var(--success-50);border-color:var(--success-500);color:var(--success-700);font-weight:600}@media (max-width: 640px){#app{padding:1rem .75rem}.app-header h1{font-size:1.4rem}.form-grid{grid-template-columns:1fr}.stat-card .stat-value{font-size:1.25rem}th,td{padding:.6rem .7rem;font-size:.82rem}}.auth-page{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:2rem 1rem;background:linear-gradient(135deg,var(--primary-50) 0%,var(--neutral-100) 100%)}.auth-card{background:var(--neutral-0);border-radius:var(--radius-lg);box-shadow:var(--shadow-lg);border:1px solid var(--neutral-200);padding:2.5rem 2rem;max-width:440px;width:100%}.auth-brand{text-align:center;margin-bottom:2rem}.auth-logo{width:56px;height:56px;border-radius:var(--radius-md);background:linear-gradient(135deg,var(--primary-500),var(--primary-700));display:flex;align-items:center;justify-content:center;color:#fff;font-weight:700;font-size:1.4rem;margin:0 auto 1rem}.auth-logo-img{width:64px;height:64px;border-radius:var(--radius-md);object-fit:cover;margin:0 auto 1rem;display:block;box-shadow:var(--shadow-sm);border:1px solid var(--neutral-200)}.auth-brand h1{font-size:1.5rem;font-weight:700;color:var(--neutral-900);margin:0 0 .4rem}.auth-brand p{font-size:.88rem;color:var(--neutral-500);margin:0}.auth-form .form-group{margin-bottom:1.1rem}.auth-form label{display:block;font-size:.85rem;font-weight:600;color:var(--neutral-700);margin-bottom:.35rem}.auth-form input{width:100%;padding:.7rem .9rem;border:1px solid var(--neutral-300);border-radius:var(--radius-md);font-size:.9rem;font-family:inherit;background:var(--neutral-0);transition:border-color .2s,box-shadow .2s}.auth-form input:focus{outline:none;border-color:var(--primary-500);box-shadow:0 0 0 3px var(--primary-100)}.btn-block{width:100%;justify-content:center;padding:.75rem;font-size:.95rem}.auth-error{background:var(--error-50);border:1px solid var(--error-100);color:var(--error-600);padding:.6rem .9rem;border-radius:var(--radius-md);font-size:.85rem;margin-bottom:1rem}.auth-footer{text-align:center;margin-top:1.5rem;font-size:.85rem;color:var(--neutral-500)}.auth-footer a{color:var(--primary-600);font-weight:600;text-decoration:none}.auth-footer a:hover{text-decoration:underline}.admin-hint{margin-top:.75rem;font-size:.78rem;color:var(--neutral-400)}.auth-success-icon{width:64px;height:64px;border-radius:50%;background:var(--success-100);color:var(--success-600);font-size:2rem;font-weight:700;display:flex;align-items:center;justify-content:center;margin:0 auto 1.2rem}.auth-pending-icon{width:64px;height:64px;border-radius:50%;background:var(--warning-100);color:var(--warning-600);font-size:2rem;display:flex;align-items:center;justify-content:center;margin:0 auto 1.2rem}.header-right{display:flex;align-items:center;gap:.75rem;flex-wrap:wrap}.user-chip{display:flex;align-items:center;gap:.6rem;padding:.5rem .85rem;background:var(--neutral-0);border-radius:var(--radius-md);border:1px solid var(--neutral-200);box-shadow:var(--shadow-sm)}.user-avatar{width:34px;height:34px;border-radius:50%;background:linear-gradient(135deg,var(--primary-500),var(--primary-700));color:#fff;font-weight:700;font-size:.95rem;display:flex;align-items:center;justify-content:center;flex-shrink:0}.user-chip strong{display:block;font-size:.85rem;color:var(--neutral-800);line-height:1.2}.user-chip small{display:block;font-size:.75rem;color:var(--neutral-500)}.admin-info-panel{margin-top:2rem;background:var(--neutral-0);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);border:1px solid var(--neutral-200);padding:1.5rem}.admin-info-panel h3{margin:0 0 1rem;font-size:1.1rem;font-weight:700;color:var(--neutral-900)}.settings-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:1rem}.setting-item{display:flex;gap:.85rem;padding:1rem;background:var(--neutral-50);border-radius:var(--radius-md);border:1px solid var(--neutral-200)}.setting-icon{font-size:1.4rem;flex-shrink:0}.setting-item strong{font-size:.92rem;color:var(--neutral-900);display:block;margin-bottom:.2rem}.setting-item p{margin:0;font-size:.82rem;color:var(--neutral-500);line-height:1.45}