:root{--color-primary:#0ea5e9;--color-primary-dark:#0284c7;--color-primary-light:#e0f2fe;--color-success:#10b981;--color-success-dark:#059669;--color-success-light:#d1fae5;--color-danger:#ef4444;--color-danger-dark:#dc2626;--color-danger-light:#fee2e2;--color-warning:#f59e0b;--color-warning-light:#fef3c7;--color-background:#f8fafc;--color-surface:#fff;--color-text-main:#0f172a;--color-text-muted:#64748b;--color-text-light:#94a3b8;--color-border:#e2e8f0;--shadow-sm:0 1px 2px 0 #0000000d;--shadow-md:0 4px 6px -1px #0000001a, 0 2px 4px -2px #0000001a;--shadow-lg:0 10px 15px -3px #0000001a, 0 4px 6px -4px #0000001a;--radius-md:8px;--radius-lg:12px;--radius-xl:16px;--radius-full:9999px;--font-bangla:"Noto Sans Bengali", "Inter", sans-serif;--font-latin:"Inter", sans-serif}*{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--font-bangla);background-color:var(--color-background);color:var(--color-text-main);-webkit-font-smoothing:antialiased;line-height:1.5}a{color:inherit;text-decoration:none}button{cursor:pointer;background:0 0;border:none;font-family:inherit}#root{flex-direction:column;min-height:100vh;display:flex}.container{width:100%;max-width:800px;margin:0 auto;padding:1rem}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.animate-fade-in{animation:.3s ease-out forwards fadeIn}::-webkit-scrollbar{width:8px}::-webkit-scrollbar-track{background:0 0}::-webkit-scrollbar-thumb{background:var(--color-border);border-radius:var(--radius-full)}::-webkit-scrollbar-thumb:hover{background:var(--color-text-light)}.app-container{flex-direction:column;min-height:100vh;padding-bottom:70px;display:flex}.app-header{background-color:var(--color-surface);box-shadow:var(--shadow-sm);z-index:10;border-bottom:1px solid var(--color-border);position:sticky;top:0}.header-container{justify-content:space-between;align-items:center;padding-top:1rem;padding-bottom:1rem;display:flex}.brand{align-items:center;gap:12px;display:flex}.logo-placeholder{background:linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));color:#fff;border-radius:var(--radius-lg);letter-spacing:1px;justify-content:center;align-items:center;width:40px;height:40px;font-size:14px;font-weight:700;display:flex}.brand-title{color:var(--color-text-main);font-size:1.1rem;font-weight:700;line-height:1.2}.brand-subtitle{color:var(--color-text-muted);font-size:.8rem}.date-display{background-color:var(--color-primary-light);color:var(--color-primary-dark);border-radius:var(--radius-full);align-items:center;gap:6px;padding:6px 12px;font-size:.9rem;font-weight:500;display:flex}.bottom-nav{background-color:var(--color-surface);padding:.5rem 0;padding-bottom:calc(.5rem + env(safe-area-inset-bottom));z-index:20;justify-content:space-around;display:flex;position:fixed;bottom:0;left:0;right:0;box-shadow:0 -4px 6px -1px #0000000d}.nav-item{color:var(--color-text-light);border-radius:var(--radius-md);flex-direction:column;align-items:center;gap:4px;padding:8px 16px;transition:all .2s;display:flex}.nav-item span{font-size:.75rem;font-weight:500}.nav-item.active{color:var(--color-primary)}.nav-item:hover{background-color:var(--color-background)}.app-main{flex:1}.dashboard{padding-top:1rem;padding-bottom:2rem}.stats-overview{grid-template-columns:1fr 1fr;gap:1rem;margin-bottom:2rem;display:grid}.stat-card{background-color:var(--color-surface);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);border:1px solid var(--color-border);align-items:center;gap:12px;padding:16px;display:flex}.stat-card.primary{border-left:4px solid var(--color-primary)}.stat-card.success{border-left:4px solid var(--color-success)}.stat-icon{border-radius:var(--radius-full);justify-content:center;align-items:center;width:48px;height:48px;display:flex}.stat-card.primary .stat-icon{background-color:var(--color-primary-light);color:var(--color-primary-dark)}.stat-card.success .stat-icon{background-color:var(--color-success-light);color:var(--color-success-dark)}.stat-info h3{color:var(--color-text-muted);margin-bottom:4px;font-size:.85rem;font-weight:500}.stat-info p{color:var(--color-text-main);font-size:1.5rem;font-weight:700;line-height:1}.section-title{color:var(--color-text-main);margin-bottom:1rem;font-size:1.25rem;font-weight:600}.class-grid{grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:1rem;display:grid}.class-card{text-align:left;background-color:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-lg);width:100%;box-shadow:var(--shadow-sm);padding:1.25rem;transition:all .2s;position:relative;overflow:hidden}.class-card:hover{box-shadow:var(--shadow-md);border-color:var(--color-primary-light);transform:translateY(-2px)}.class-card:active{transform:translateY(0)}.class-header{justify-content:space-between;align-items:center;margin-bottom:1rem;display:flex}.class-header h3{color:var(--color-primary-dark);font-size:1.5rem;font-weight:700}.badge{background-color:var(--color-background);color:var(--color-text-muted);border-radius:var(--radius-full);padding:4px 10px;font-size:.8rem;font-weight:500}.class-progress{flex-direction:column;gap:8px;display:flex}.progress-text{color:var(--color-text-light);justify-content:space-between;font-size:.85rem;font-weight:500;display:flex}.progress-bar-bg{background-color:var(--color-border);border-radius:var(--radius-full);width:100%;height:6px;overflow:hidden}.progress-bar-fill{border-radius:var(--radius-full);height:100%;transition:width .5s ease-out,background-color .3s}.attendance-page{padding-bottom:2rem}.attendance-header{background-color:var(--color-surface);border-bottom:1px solid var(--color-border);margin-bottom:1.5rem;padding:1rem 0}.header-content{justify-content:space-between;align-items:center;display:flex}.back-btn{color:var(--color-text-main);border-radius:var(--radius-md);align-items:center;gap:6px;margin-left:-12px;padding:6px 12px;font-weight:500;transition:background-color .2s;display:flex}.back-btn:hover{background-color:var(--color-background)}.class-title-area{text-align:right}.class-title-area h2{color:var(--color-primary-dark);margin-bottom:2px;font-size:1.25rem;font-weight:700}.student-count{color:var(--color-text-muted);background-color:var(--color-background);border-radius:var(--radius-full);padding:2px 8px;font-size:.8rem}.actions-bar{flex-wrap:wrap;gap:1rem;margin-bottom:1.5rem;display:flex}.search-box{flex:1;align-items:center;min-width:200px;display:flex;position:relative}.search-icon{color:var(--color-text-light);position:absolute;left:12px}.search-box input{border:1px solid var(--color-border);border-radius:var(--radius-md);outline:none;width:100%;padding:10px 10px 10px 38px;font-family:inherit;font-size:.95rem;transition:border-color .2s}.search-box input:focus{border-color:var(--color-primary);box-shadow:0 0 0 2px var(--color-primary-light)}.mark-all-btn{background-color:var(--color-success-light);color:var(--color-success-dark);border-radius:var(--radius-md);white-space:nowrap;align-items:center;gap:6px;padding:10px 16px;font-weight:600;transition:all .2s;display:flex}.mark-all-btn:hover{background-color:var(--color-success);color:#fff}.filter-tabs{gap:8px;margin-bottom:1.5rem;padding-bottom:4px;display:flex;overflow-x:auto}.filter-tabs button{background-color:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-full);color:var(--color-text-muted);white-space:nowrap;padding:6px 14px;font-size:.85rem;font-weight:500;transition:all .2s}.filter-tabs button.active{background-color:var(--color-text-main);color:#fff;border-color:var(--color-text-main)}.filter-tabs button.active.present{background-color:var(--color-success);border-color:var(--color-success)}.filter-tabs button.active.absent{background-color:var(--color-danger);border-color:var(--color-danger)}.student-list{flex-direction:column;gap:.75rem;display:flex}.student-card{background-color:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);padding:16px;transition:all .3s;overflow:hidden}.student-card.is-present{border-left:4px solid var(--color-success)}.student-card.is-absent{border-left:4px solid var(--color-danger);opacity:.9;background-color:#fafafa}.student-top-row{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:12px;display:flex}.student-identity{align-items:center;gap:12px;display:flex}.student-roll{background-color:var(--color-background);color:var(--color-text-main);border-radius:var(--radius-full);justify-content:center;align-items:center;width:36px;height:36px;font-size:.9rem;font-weight:700;display:flex}.student-name{color:var(--color-text-main);font-size:1.05rem;font-weight:600}.status-toggles{background-color:var(--color-background);border-radius:var(--radius-md);padding:4px;display:flex}.status-btn{color:var(--color-text-muted);padding:6px 16px;font-size:.85rem;font-weight:600;transition:all .2s;border-radius:var(--radius-md)!important}.status-btn.present.active{background-color:var(--color-success);color:#fff;box-shadow:var(--shadow-sm)}.status-btn.absent.active{background-color:var(--color-danger);color:#fff;box-shadow:var(--shadow-sm)}.appearance-trackers{border-top:1px dashed var(--color-border);margin-top:16px;padding-top:16px;transition:max-height .4s,opacity .3s,margin .3s,padding .3s}.appearance-trackers.collapsed{opacity:0;pointer-events:none;border-top-color:#0000;max-height:0;margin-top:0;padding-top:0}.appearance-trackers.expanded{opacity:1;max-height:100px}.tracker-group{flex-wrap:wrap;gap:20px;display:flex}.checkbox-container{cursor:pointer;color:var(--color-text-main);-webkit-user-select:none;user-select:none;align-items:center;padding-left:28px;font-size:.9rem;font-weight:500;display:flex;position:relative}.checkbox-container input{opacity:0;cursor:pointer;width:0;height:0;position:absolute}.checkmark{background-color:var(--color-background);border:1px solid var(--color-border);border-radius:4px;width:20px;height:20px;transition:all .2s;position:absolute;top:50%;left:0;transform:translateY(-50%)}.checkbox-container:hover input~.checkmark{border-color:var(--color-primary)}.checkbox-container input:checked~.checkmark{background-color:var(--color-primary);border-color:var(--color-primary)}.checkmark:after{content:"";display:none;position:absolute}.checkbox-container input:checked~.checkmark:after{display:block}.checkbox-container .checkmark:after{border:2px solid #fff;border-width:0 2px 2px 0;width:5px;height:10px;top:3px;left:6px;transform:rotate(45deg)}.checkbox-container input:disabled~.checkmark{opacity:.5;cursor:not-allowed}.empty-state{text-align:center;color:var(--color-text-light);padding:3rem 1rem}.empty-icon{opacity:.5;margin-bottom:1rem}@media (width<=480px){.tracker-group{gap:12px}}.reports-page{padding-top:1rem;padding-bottom:3rem}.date-selector-card{background-color:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);text-align:center;margin-bottom:1.5rem;padding:1.5rem}.selector-header{justify-content:center;align-items:center;gap:12px;margin-bottom:1rem;display:flex}.selector-header h2{color:var(--color-text-main);font-size:1.25rem;font-weight:700}.primary-text{color:var(--color-primary)}.select-wrapper select{border:1px solid var(--color-primary-light);border-radius:var(--radius-md);width:100%;max-width:300px;color:var(--color-primary-dark);background-color:var(--color-primary-light);cursor:pointer;outline:none;padding:12px;font-family:inherit;font-size:1rem;font-weight:600}.summary-cards{grid-template-columns:repeat(3,1fr);gap:1rem;margin-bottom:1.5rem;display:grid}.metric-box{background-color:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-lg);text-align:center;flex-direction:column;gap:4px;padding:1rem;display:flex}.metric-box.success-bg{background-color:var(--color-success-light);border-color:var(--color-success)}.metric-box.danger-bg{background-color:var(--color-danger-light);border-color:var(--color-danger)}.metric-label{color:var(--color-text-muted);font-size:.8rem;font-weight:600}.metric-box.success-bg .metric-label{color:var(--color-success-dark)}.metric-box.danger-bg .metric-label{color:var(--color-danger-dark)}.metric-value{color:var(--color-text-main);font-size:1.75rem;font-weight:700}.metric-box.success-bg .metric-value{color:var(--color-success-dark)}.metric-box.danger-bg .metric-value{color:var(--color-danger-dark)}.trackers-overview{background-color:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-lg);margin-bottom:1.5rem;padding:1.5rem}.trackers-overview h3{color:var(--color-text-muted);text-align:center;margin-bottom:1rem;font-size:1rem}.tracker-stats-grid{grid-template-columns:repeat(3,1fr);gap:1rem;display:grid}.t-stat{text-align:center;flex-direction:column;display:flex}.t-value{color:var(--color-warning);font-size:1.5rem;font-weight:700}.t-label{color:var(--color-text-muted);font-size:.8rem;font-weight:500}.section-subtitle{color:var(--color-text-main);align-items:center;gap:8px;margin-bottom:1rem;font-size:1.1rem;font-weight:600;display:flex}.class-reports{margin-bottom:2rem}.report-class-row{background-color:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-md);margin-bottom:.75rem;padding:1rem}.rc-header{justify-content:space-between;align-items:center;margin-bottom:8px;display:flex}.rc-header h4{color:var(--color-primary-dark);font-size:1.1rem}.rc-percent{color:var(--color-success-dark);background:var(--color-success-light);border-radius:var(--radius-full);padding:2px 8px;font-size:.85rem;font-weight:700}.rc-details{color:var(--color-text-muted);flex-wrap:wrap;gap:12px;font-size:.85rem;display:flex}.rc-details span{background-color:var(--color-background);border-radius:4px;padding:2px 8px}.export-actions{background-color:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-lg);padding:1.5rem}.btn-group{flex-wrap:wrap;gap:1rem;display:flex}.export-btn{border-radius:var(--radius-md);color:#fff;flex:1;justify-content:center;align-items:center;gap:8px;min-width:200px;padding:12px;font-size:.95rem;font-weight:600;transition:opacity .2s;display:flex}.export-btn:hover{opacity:.9}.export-btn.json{background-color:#4f46e5}.export-btn.csv{background-color:#16a34a}.student-report-page{padding-bottom:2rem}.report-config-card{background-color:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);margin-bottom:2rem;padding:1.5rem}.report-config-card .card-header{border-bottom:1px solid var(--color-border);align-items:center;gap:12px;margin-bottom:1.5rem;padding-bottom:1rem;display:flex}.report-config-card h2{color:var(--color-text-main);font-size:1.25rem;font-weight:700}.filters-grid{grid-template-columns:repeat(2,1fr);gap:1.25rem;display:grid}@media (width<=600px){.filters-grid{grid-template-columns:1fr}}.filter-group{flex-direction:column;gap:8px;display:flex}.filter-group label{color:var(--color-text-muted);font-size:.9rem;font-weight:600}.filter-group select,.filter-group .date-input{border:1px solid var(--color-border);border-radius:var(--radius-md);background-color:var(--color-background);color:var(--color-text-main);outline:none;padding:10px;font-family:inherit;font-size:.95rem;transition:border-color .2s}.filter-group select:focus,.filter-group .date-input:focus{border-color:var(--color-primary)}.report-results{flex-direction:column;gap:1.5rem;display:flex}.download-btn{background-color:var(--color-primary);color:#fff;border-radius:var(--radius-md);cursor:pointer;border:none;align-self:flex-end;align-items:center;gap:8px;padding:10px 16px;font-weight:600;transition:background-color .2s;display:flex}.download-btn:hover{background-color:var(--color-primary-dark)}.printable-area{border-radius:var(--radius-lg);box-shadow:var(--shadow-md);color:#333;background-color:#fff;padding:40px}.print-header{text-align:center;border-bottom:2px solid #eee;margin-bottom:2rem;padding-bottom:1rem}.print-header h2{color:var(--color-primary-dark);margin-bottom:8px;font-size:1.75rem}.print-header p{color:#666;font-size:1.1rem}.class-table-wrapper{margin-top:20px;overflow-x:auto}.class-report-table{border-collapse:collapse;text-align:left;width:100%;font-size:.95rem}.class-report-table th,.class-report-table td{border:1px solid #ddd;padding:12px 10px}.class-report-table th{color:#444;white-space:nowrap;background-color:#f8f9fa;font-weight:600}.center-col,.class-report-table th.center-col{text-align:center}.class-report-table tr:hover{background-color:#fcfcfc}.success-text{color:var(--color-success-dark)}.danger-text{color:var(--color-danger-dark)}.warning-col{background-color:#f59e0b0d}.danger-col{background-color:#ef44440d}.warning-badge{color:#d97706;background-color:#fef3c7;border-radius:12px;padding:2px 8px;font-size:.85rem;font-weight:600;display:inline-block}.danger-badge{color:#b91c1c;background-color:#fee2e2;border-radius:12px;padding:2px 8px;font-size:.85rem;font-weight:600;display:inline-block}.loading-state{text-align:center;color:var(--color-text-muted);padding:3rem;font-size:1.1rem}@media print{body *{visibility:hidden}.printable-area,.printable-area *{visibility:visible}.printable-area{width:100%;box-shadow:none;margin:0;padding:0;position:absolute;top:0;left:0}.class-report-table th{-webkit-print-color-adjust:exact;print-color-adjust:exact;background-color:#f8f9fa!important}.class-report-table thead{display:table-header-group}.class-report-table tr{page-break-inside:avoid}.warning-col{-webkit-print-color-adjust:exact;print-color-adjust:exact;background-color:#f59e0b0d!important}.danger-col{-webkit-print-color-adjust:exact;print-color-adjust:exact;background-color:#ef44440d!important}.warning-badge{-webkit-print-color-adjust:exact;print-color-adjust:exact;color:#d97706!important;background-color:#fef3c7!important}.danger-badge{-webkit-print-color-adjust:exact;print-color-adjust:exact;color:#b91c1c!important;background-color:#fee2e2!important}.no-print{display:none!important}}