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h2{color:#143258;font-size:1.5rem;margin-bottom:1.5rem}.scanner-form{align-items:center;display:flex;flex-wrap:wrap;gap:1rem;justify-content:center}.barcode-input{border:2px solid #ddd;border-radius:8px;font-size:1.1rem;height:3rem;margin:18px 0 0;min-width:300px;padding:12px;transition:border-color .3s ease}.barcode-input:focus{border-color:#143258;box-shadow:0 0 0 3px #1432581a;outline:none}.scanner-btn{font-size:1.1rem;height:3rem;min-width:120px;padding:12px 24px}.active-students-section{background:#fff;border-radius:15px;box-shadow:0 4px 15px #0000001a;display:flex;flex:9 1;flex-direction:column;overflow-y:auto;padding:1rem}.section-header{align-items:center;display:flex;flex-shrink:0;justify-content:space-between;margin-bottom:1.5rem}.section-header h2{color:#143258;font-size:1.5rem;margin:0}.empty-state{color:#666;font-style:italic;padding:3rem;text-align:center}.students-grid{--gap:1rem;--base-cols:5;--card-min:220px;--card-max:240px;grid-gap:var(--gap);align-content:start;display:grid;gap:var(--gap);grid-template-columns:repeat(auto-fit,minmax(clamp(var(--card-min),calc((100% - (var(--base-cols) - 1)*var(--gap))/var(--base-cols)),clamp(220px,28vmin,520px)),1fr));grid-template-columns:repeat(auto-fit,minmax(clamp(var(--card-min),calc((100% - (var(--base-cols) - 1)*var(--gap))/var(--base-cols)),var(--card-max)),1fr))}.student-footer{background-color:#143258;color:#fff;flex-shrink:0;margin-top:auto;padding:1rem;text-align:center}.student-footer p{font-size:.9rem;margin:0}@media (max-width:768px){.student-main{height:auto;padding:1rem}.scanner-form{flex-direction:column}.barcode-input{min-width:auto;width:100%}.scanner-btn{width:100%}.section-header{flex-direction:column;gap:1rem;text-align:center}.students-grid{grid-template-columns:1fr}}@media (max-width:900px),(orientation:portrait){.parent-dashboard-header{align-items:stretch;flex-direction:column;gap:15px}.header-titles{text-align:center}.scanner-container{max-width:100%}.parent-dashboard-header .scanner-form{flex-direction:column}.parent-barcode-input{width:100%!important}}@media (max-width:480px){.active-students-section,.scanner-section{padding:1.5rem}.student-card{padding:1rem}}.swal-checkin-popup{border-radius:20px!important;box-shadow:0 30px 80px #00000059!important;padding:28px 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h3{color:#143258!important}.checkout-class{background:#ffebee!important}.checkout-time{color:#ffae00!important}body{font-family:Arial,sans-serif}.App{min-height:100vh}.loading{align-items:center;color:#666;display:flex;font-size:1.2rem;height:100vh;justify-content:center}.btn{border:none;border-radius:5px;cursor:pointer;font-size:1rem;padding:10px 20px;transition:background-color .3s ease}.btn-primary{background-color:#143258;color:#fff}.btn-primary:hover{background-color:#1e4a7a}.btn-secondary{background-color:#6c757d;color:#fff}.btn-secondary:hover{background-color:#5a6268}.btn-danger{background-color:#dc3545;color:#fff}.btn-danger:hover{background-color:#c82333}.btn-success{background-color:#28a745;color:#fff}.btn-success:hover{background-color:#218838}.form-group{margin-bottom:1rem}.form-group label{color:#333;display:block;font-weight:700;margin-bottom:.5rem}.form-group input,.form-group select,.form-group textarea{border:1px solid 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