:root{--color-primary: #1a73e8;--color-primary-dark: #1557b0;--color-primary-light: #4285f4;--color-success: #34a853;--color-warning: #fbbc04;--color-error: #ea4335;--color-bg: #f8fafc;--color-bg-card: #ffffff;--color-bg-dark: #1e293b;--color-text: #1e293b;--color-text-secondary: #64748b;--color-text-light: #94a3b8;--color-border: #e2e8f0;--space-xs: .25rem;--space-sm: .5rem;--space-md: 1rem;--space-lg: 1.5rem;--space-xl: 2rem;--space-2xl: 3rem;--radius-sm: .375rem;--radius-md: .5rem;--radius-lg: .75rem;--radius-xl: 1rem;--shadow-sm: 0 1px 2px rgba(0, 0, 0, .05);--shadow-md: 0 4px 6px -1px rgba(0, 0, 0, .1), 0 2px 4px -2px rgba(0, 0, 0, .1);--shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, .1), 0 4px 6px -4px rgba(0, 0, 0, .1);--font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;--font-mono: "JetBrains Mono", "Fira Code", monospace}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{font-size:16px;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{font-family:var(--font-sans);background:var(--color-bg);color:var(--color-text);line-height:1.6;min-height:100vh}a{color:var(--color-primary);text-decoration:none}a:hover{text-decoration:underline}.app{min-height:100vh}.page{display:flex;min-height:100vh}.sidebar{width:260px;background:var(--color-bg-dark);color:#fff;padding:var(--space-lg);display:flex;flex-direction:column}.sidebar-logo{font-size:1.5rem;font-weight:700;margin-bottom:var(--space-2xl);display:flex;align-items:center;gap:var(--space-sm)}.sidebar-nav{display:flex;flex-direction:column;gap:var(--space-xs);flex:1}.sidebar-link{display:flex;align-items:center;gap:var(--space-sm);padding:var(--space-sm) var(--space-md);border-radius:var(--radius-md);color:var(--color-text-light);transition:all .2s}.sidebar-link:hover,.sidebar-link.active{background:#ffffff1a;color:#fff;text-decoration:none}.sidebar-footer{margin-top:auto;padding-top:var(--space-lg);border-top:1px solid rgba(255,255,255,.1)}.main-content{flex:1;padding:var(--space-xl);overflow-y:auto}.page-header{margin-bottom:var(--space-xl)}.page-header h1{font-size:1.75rem;font-weight:600;margin-bottom:var(--space-xs)}.page-header p{color:var(--color-text-secondary)}.card{background:var(--color-bg-card);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);border:1px solid var(--color-border);padding:var(--space-lg)}.card-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:var(--space-md)}.card-title{font-size:1rem;font-weight:600;color:var(--color-text-secondary)}.stats-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:var(--space-lg);margin-bottom:var(--space-xl)}.stat-card{background:var(--color-bg-card);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);border:1px solid var(--color-border);padding:var(--space-lg)}.stat-value{font-size:2rem;font-weight:700;color:var(--color-primary)}.stat-label{color:var(--color-text-secondary);font-size:.875rem;margin-top:var(--space-xs)}.form-group{margin-bottom:var(--space-lg)}.form-label{display:block;font-weight:500;margin-bottom:var(--space-xs);color:var(--color-text)}.form-input{width:100%;padding:var(--space-sm) var(--space-md);border:1px solid var(--color-border);border-radius:var(--radius-md);font-size:1rem;font-family:inherit;transition:border-color .2s,box-shadow .2s}.form-input:focus{outline:none;border-color:var(--color-primary);box-shadow:0 0 0 3px #1a73e81a}.form-input::placeholder{color:var(--color-text-light)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:var(--space-sm);padding:var(--space-sm) var(--space-lg);border:none;border-radius:var(--radius-md);font-size:.875rem;font-weight:500;font-family:inherit;cursor:pointer;transition:all .2s}.btn-primary{background:var(--color-primary);color:#fff}.btn-primary:hover{background:var(--color-primary-dark)}.btn-secondary{background:var(--color-bg);color:var(--color-text);border:1px solid var(--color-border)}.btn-secondary:hover{background:var(--color-border)}.btn-danger{background:var(--color-error);color:#fff}.btn-danger:hover{background:#d33426}.btn:disabled{opacity:.5;cursor:not-allowed}.table-container{overflow-x:auto}.table{width:100%;border-collapse:collapse}.table th,.table td{padding:var(--space-sm) var(--space-md);text-align:left;border-bottom:1px solid var(--color-border)}.table th{font-weight:600;color:var(--color-text-secondary);font-size:.75rem;text-transform:uppercase;letter-spacing:.05em}.table tr:hover{background:var(--color-bg)}.badge{display:inline-block;padding:var(--space-xs) var(--space-sm);border-radius:var(--radius-sm);font-size:.75rem;font-weight:500}.badge-success{background:#34a8531a;color:var(--color-success)}.badge-warning{background:#fbbc041a;color:#b45309}.badge-error{background:#ea43351a;color:var(--color-error)}.file-upload{border:2px dashed var(--color-border);border-radius:var(--radius-lg);padding:var(--space-2xl);text-align:center;cursor:pointer;transition:all .2s}.file-upload:hover,.file-upload.dragover{border-color:var(--color-primary);background:#1a73e80d}.file-upload-icon{font-size:3rem;margin-bottom:var(--space-md);color:var(--color-text-light)}.file-upload-text{color:var(--color-text-secondary)}.file-upload-text strong{color:var(--color-primary)}.login-page{min-height:100vh;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,var(--color-bg-dark) 0%,#334155 100%)}.login-card{width:100%;max-width:400px;background:#fff;border-radius:var(--radius-xl);box-shadow:var(--shadow-lg);padding:var(--space-2xl)}.login-logo{text-align:center;margin-bottom:var(--space-xl)}.login-logo h1{font-size:1.5rem;color:var(--color-primary)}.login-logo p{color:var(--color-text-secondary);font-size:.875rem}.login-error{background:#ea43351a;color:var(--color-error);padding:var(--space-sm) var(--space-md);border-radius:var(--radius-md);margin-bottom:var(--space-lg);font-size:.875rem}.loading-screen{min-height:100vh;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:var(--space-md)}.spinner{width:40px;height:40px;border:3px solid var(--color-border);border-top-color:var(--color-primary);border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.text-center{text-align:center}.text-right{text-align:right}.mt-md{margin-top:var(--space-md)}.mb-md{margin-bottom:var(--space-md)}.flex{display:flex}.gap-sm{gap:var(--space-sm)}.gap-md{gap:var(--space-md)}.items-center{align-items:center}.justify-between{justify-content:space-between}.justify-end{justify-content:flex-end}.modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#00000080;display:flex;align-items:center;justify-content:center;z-index:100;padding:var(--space-lg)}.modal-card{background:#fff;border-radius:var(--radius-xl);box-shadow:var(--shadow-lg);padding:var(--space-xl);width:100%;max-width:500px;max-height:90vh;overflow-y:auto}.modal-card h2{font-size:1.25rem;font-weight:600;margin-bottom:var(--space-lg)}.alert{padding:var(--space-sm) var(--space-md);border-radius:var(--radius-md);font-size:.875rem}.alert-error{background:#ea43351a;color:var(--color-error)}.alert-success{background:#34a8531a;color:var(--color-success)}.alert-warning{background:#fbbc041a;color:#b45309}.btn-sm{padding:var(--space-xs) var(--space-sm);font-size:.75rem}.color-gray-100{--color-gray-100: #f3f4f6}.features-list{display:flex;flex-direction:column;gap:var(--space-md)}.feature-item{display:flex;align-items:flex-start;gap:var(--space-md);padding:var(--space-sm) 0;border-bottom:1px solid var(--color-border)}.feature-item:last-child{border-bottom:none}.feature-info{display:flex;flex-direction:column;gap:var(--space-xs)}.feature-info strong{font-weight:500}.feature-info small{color:var(--color-text-secondary);font-size:.8rem}.feature-toggle{position:relative;display:inline-block;width:48px;height:26px;flex-shrink:0}.feature-toggle input{opacity:0;width:0;height:0}.toggle-slider{position:absolute;cursor:pointer;top:0;right:0;bottom:0;left:0;background:var(--color-border);border-radius:26px;transition:.3s}.toggle-slider:before{position:absolute;content:"";height:20px;width:20px;left:3px;bottom:3px;background:#fff;border-radius:50%;transition:.3s}.feature-toggle input:checked+.toggle-slider{background:var(--color-primary)}.feature-toggle input:checked+.toggle-slider:before{transform:translate(22px)}.print-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:var(--space-md);margin-top:var(--space-lg)}.print-card{background:var(--color-bg-card);border:1px solid var(--color-border);border-radius:var(--radius-lg);padding:var(--space-lg);text-align:center;transition:box-shadow .2s}.print-card:hover{box-shadow:var(--shadow-md)}.print-card-name{font-weight:600;font-size:.95rem;margin-bottom:var(--space-xs);color:var(--color-text)}.print-card-class{font-size:.8rem;color:var(--color-text-secondary);margin-bottom:var(--space-sm)}.print-card-qr{margin:var(--space-sm) auto;display:flex;justify-content:center}.print-card-pin{font-family:var(--font-mono);font-size:1.5rem;font-weight:700;letter-spacing:.15em;color:var(--color-primary-dark);margin-top:var(--space-sm)}.print-card-label{font-size:.7rem;color:var(--color-text-light);text-transform:uppercase;letter-spacing:.05em}.print-only{display:none}@media print{.no-print,.sidebar,.sidebar-footer{display:none!important}.page{display:block}.main-content{padding:0;margin:0}body{background:#fff;color:#000;font-size:11pt}.print-only{display:block!important}.print-title{text-align:center;margin-bottom:1cm}.print-title h2{font-size:16pt;margin-bottom:.25cm}.print-title p{font-size:10pt;color:#666}.print-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:.4cm;margin:0}.print-card{border:1px solid #ccc;border-radius:4px;padding:.3cm;page-break-inside:avoid;break-inside:avoid;box-shadow:none}.print-card-name{font-size:9pt}.print-card-class{font-size:8pt}.print-card-pin{font-size:14pt;color:#000}.print-card-label{font-size:7pt}.print-card:nth-child(12n){page-break-after:always}}