@import "https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap";
:root{--bg-primary:#f5f7fa;--bg-secondary:#fff;--bg-card:#fff;--bg-card-hover:#f8fafc;--bg-sidebar:#fff;--bg-input:#f1f5f9;--text-primary:#0f172a;--text-secondary:#475569;--text-muted:#94a3b8;--accent:#6366f1;--accent-hover:#4f46e5;--accent-muted:#6366f11a;--success:#10b981;--success-muted:#10b9811a;--warning:#f59e0b;--warning-muted:#f59e0b1a;--danger:#ef4444;--danger-muted:#ef444414;--info:#3b82f6;--info-muted:#3b82f61a;--border:#e2e8f0;--border-hover:#cbd5e1;--sidebar-width:260px;--header-height:64px;--radius-sm:8px;--radius:12px;--radius-lg:16px;--radius-xl:20px;--shadow-sm:0 1px 2px #0000000a,0 1px 3px #0000000f;--shadow:0 2px 8px #0000000f,0 4px 16px #0000000a;--shadow-lg:0 8px 24px #00000014,0 16px 48px #0000000a;--shadow-glow:0 0 0 3px #6366f126;--transition:.2s cubic-bezier(.4,0,.2,1)}*,:before,:after{box-sizing:border-box;margin:0;padding:0}html,body{height:100%;color:var(--text-primary);background:var(--bg-primary);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;font-family:Inter,-apple-system,BlinkMacSystemFont,sans-serif;font-size:14px;overflow-x:hidden}a{color:inherit;text-decoration:none}button{cursor:pointer;color:inherit;background:0 0;border:none;font-family:inherit}input,select,textarea{font-family:inherit;font-size:inherit;color:inherit;background:var(--bg-input);border:1px solid var(--border);border-radius:var(--radius-sm);transition:border var(--transition),box-shadow var(--transition);outline:none;padding:9px 14px}input:focus,select:focus,textarea:focus{border-color:var(--accent);box-shadow:var(--shadow-glow);background:#fff}.admin-layout{min-width:0;height:100vh;display:flex;overflow:hidden}.sidebar{width:var(--sidebar-width);background:var(--bg-sidebar);border-right:1px solid var(--border);z-index:100;min-width:0;transition:width var(--transition),border-color var(--transition),opacity var(--transition);flex-direction:column;flex-shrink:0;display:flex;overflow:hidden}@media (min-width:769px){.admin-layout.sidebar-collapsed .sidebar{opacity:0;pointer-events:none;border-right-color:#0000;width:0}}.sidebar-brand{border-bottom:1px solid var(--border);padding:16px}.sidebar-logo{border-bottom:1px solid var(--border);align-items:center;gap:12px;padding:20px 24px;display:flex}.sidebar-logo .logo-icon{border-radius:var(--radius-sm);color:#fff;background:linear-gradient(135deg,#6366f1,#8b5cf6);justify-content:center;align-items:center;width:36px;height:36px;font-size:18px;font-weight:800;display:flex}.sidebar-logo h1{color:var(--text-primary);letter-spacing:-.02em;font-size:18px;font-weight:700}.sidebar-nav{flex:1;padding:16px 12px;overflow-y:auto}.nav-section{margin-bottom:24px}.nav-section-title{text-transform:uppercase;letter-spacing:.08em;color:var(--text-muted);margin-bottom:8px;padding:0 12px;font-size:11px;font-weight:600}.nav-item{border-radius:var(--radius-sm);color:var(--text-secondary);transition:all var(--transition);align-items:center;gap:12px;margin-bottom:2px;padding:10px 12px;font-size:13.5px;font-weight:500;display:flex;position:relative}.nav-item:hover{background:var(--bg-primary);color:var(--text-primary)}.nav-item.active{background:var(--accent-muted);color:var(--accent);font-weight:600}.nav-item.active:before{content:"";background:var(--accent);border-radius:0 3px 3px 0;width:3px;height:20px;position:absolute;top:50%;left:0;transform:translateY(-50%)}.nav-item svg{flex-shrink:0;width:18px;height:18px}.nav-badge{background:var(--accent);color:#fff;border-radius:10px;margin-left:auto;padding:2px 8px;font-size:11px;font-weight:600}.sidebar-footer{border-top:1px solid var(--border);flex-direction:column;gap:12px;padding:16px;display:flex}.user-info{align-items:center;gap:12px;display:flex}.user-avatar{background:var(--accent-muted);width:36px;height:36px;color:var(--accent);border-radius:50%;justify-content:center;align-items:center;font-size:14px;font-weight:600;display:flex}.user-details{flex:1;overflow:hidden}.user-name{color:var(--text-primary);white-space:nowrap;text-overflow:ellipsis;font-size:13px;font-weight:600;overflow:hidden}.user-role{color:var(--text-muted);text-transform:capitalize;font-size:11px}.logout-btn{border-radius:var(--radius-sm);width:100%;color:var(--text-secondary);transition:all var(--transition);justify-content:center;align-items:center;gap:8px;padding:8px;font-size:13px;font-weight:500;display:flex}.logout-btn:hover{background:var(--danger-muted);color:var(--danger)}.main-content{flex-direction:column;flex:1;min-width:0;display:flex;overflow:hidden}.header{height:var(--header-height);background:var(--bg-secondary);border-bottom:1px solid var(--border);flex-shrink:0;justify-content:space-between;align-items:center;padding:0 28px;display:flex}.header-left{align-items:center;gap:16px;min-width:0;display:flex}.header-left h2{letter-spacing:-.01em;min-width:0;font-size:17px;font-weight:600}.header-right{align-items:center;gap:12px;min-width:0;display:flex}.header-search{min-width:0;position:relative}.header-search input{background:var(--bg-primary);border-radius:var(--radius);border:1px solid var(--border);width:260px;padding:8px 12px 8px 36px;font-size:13px}.header-search svg{width:16px;height:16px;color:var(--text-muted);position:absolute;top:50%;left:10px;transform:translateY(-50%)}.icon-btn{border-radius:var(--radius-sm);width:36px;height:36px;transition:all var(--transition);justify-content:center;align-items:center;display:flex;position:relative}.icon-btn:hover{background:var(--bg-primary)}.icon-btn svg{width:18px;height:18px;color:var(--text-secondary)}.icon-btn .badge-dot{background:var(--danger);border:2px solid var(--bg-secondary);border-radius:50%;width:8px;height:8px;position:absolute;top:6px;right:6px}.avatar{color:#fff;cursor:pointer;background:linear-gradient(135deg,#6366f1,#8b5cf6);border-radius:50%;justify-content:center;align-items:center;width:34px;height:34px;font-size:13px;font-weight:600;display:flex}.sidebar-toggle-btn{display:flex}.sidebar-toggle-btn.is-collapsed{background:var(--accent-muted)}.sidebar-toggle-btn.is-collapsed svg{color:var(--accent)}.page-content{flex:1;min-width:0;padding:28px;overflow-y:auto}.ops-side-drawer-overlay{z-index:1100;background:#0f172a38;justify-content:flex-end;display:flex;position:fixed;inset:0}.ops-side-drawer{background:var(--bg-secondary);border-left:1px solid var(--border);flex-direction:column;width:min(460px,100vw);height:100vh;display:flex;box-shadow:-20px 0 48px #0f172a1f}.ops-side-drawer__header{border-bottom:1px solid var(--border);justify-content:space-between;align-items:flex-start;gap:16px;padding:20px 20px 16px;display:flex}.ops-side-drawer__title-wrap{gap:6px;min-width:0;display:grid}.ops-side-drawer__title-wrap h3{color:var(--text-primary);margin:0;font-size:18px;font-weight:700}.ops-side-drawer__title-wrap p{color:var(--text-secondary);margin:0;font-size:13px}.ops-side-drawer__body{flex:1;gap:16px;min-height:0;padding:20px;display:grid;overflow-y:auto}.ops-side-drawer__footer{border-top:1px solid var(--border);flex-wrap:wrap;justify-content:flex-end;gap:10px;padding:16px 20px 20px;display:flex}.ops-side-drawer__section{border:1px solid var(--border);background:var(--bg-card);border-radius:16px;gap:12px;padding:16px;display:grid}.ops-side-drawer__section-title{color:var(--text-primary);margin:0;font-size:13px;font-weight:700}.ops-side-drawer__facts{gap:10px;display:grid}.ops-side-drawer__fact{justify-content:space-between;align-items:flex-start;gap:12px;display:flex}.ops-side-drawer__fact-label{color:var(--text-muted);font-size:12px}.ops-side-drawer__fact-value{color:var(--text-primary);text-align:right;font-size:13px;font-weight:600}.ops-side-drawer__note{color:var(--text-secondary);margin:0;font-size:13px;line-height:1.5}.ops-side-drawer__chips{flex-wrap:wrap;gap:8px;display:flex}.ops-side-drawer__form-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;display:grid}.ops-side-drawer__field{gap:6px;min-width:0;display:grid}.ops-side-drawer__field--full{grid-column:1/-1}.ops-side-drawer__action-row{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:12px;display:flex}.ops-side-drawer__chip{background:var(--bg-primary);border:1px solid var(--border);color:var(--text-secondary);border-radius:999px;align-items:center;padding:6px 10px;font-size:12px;font-weight:600;display:inline-flex}@media (max-width:768px){.ops-side-drawer__form-grid{grid-template-columns:1fr}.ops-side-drawer__field--full{grid-column:auto}.ops-side-drawer__action-row{flex-direction:column;align-items:stretch}}.stats-grid{grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:16px;margin-bottom:28px;display:grid}.stat-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);transition:all var(--transition);box-shadow:var(--shadow-sm);padding:20px 22px}.stat-card:hover{border-color:var(--border-hover);box-shadow:var(--shadow);transform:translateY(-2px)}.stat-card-header{justify-content:space-between;align-items:center;margin-bottom:12px;display:flex}.stat-card-header span{color:var(--text-secondary);font-size:13px;font-weight:500}.stat-icon{border-radius:var(--radius);justify-content:center;align-items:center;width:40px;height:40px;display:flex}.stat-icon svg{width:20px;height:20px}.stat-icon.purple{background:var(--accent-muted);color:var(--accent)}.stat-icon.green{background:var(--success-muted);color:var(--success)}.stat-icon.orange{background:var(--warning-muted);color:var(--warning)}.stat-icon.blue{background:var(--info-muted);color:var(--info)}.stat-icon.red{background:var(--danger-muted);color:var(--danger)}.stat-value{letter-spacing:-.02em;margin-bottom:4px;font-size:28px;font-weight:700}.stat-change{color:var(--success);align-items:center;gap:4px;font-size:12px;font-weight:500;display:flex}.stat-change.negative{color:var(--danger)}.table-container{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);min-width:0;overflow:hidden}.card-panel{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);padding:20px;overflow:hidden}.card-panel>.table-header:first-child{margin:-20px -20px 0}.card-panel>.table-responsive{margin:0 -20px -20px}.table-responsive{-webkit-overflow-scrolling:touch;width:100%;min-width:0;overflow:auto hidden}.data-table{border-collapse:collapse;width:max-content;min-width:100%}.expense-table-layout{table-layout:fixed;width:100%;min-width:0}.expense-table-col-date{width:124px}.expense-table-col-summary{width:32%}.expense-table-col-target{white-space:normal;overflow-wrap:anywhere;word-break:break-word;width:38%;line-height:1.6}.expense-table-col-amount{white-space:nowrap;width:148px}.expense-table-col-actions{white-space:nowrap;width:96px}.expense-table-summary{gap:4px;display:grid}.expense-table-summary-title{color:var(--text-primary);overflow-wrap:anywhere;font-weight:600;line-height:1.5}.expense-table-summary-meta,.expense-table-summary-note,.expense-table-target-lines{color:var(--text-secondary);overflow-wrap:anywhere;font-size:13px;line-height:1.6}.data-table tfoot tr{background:linear-gradient(#f8fafc 0%,#eef2ff 100%)}.data-table tfoot td{color:var(--text-primary)}.table-header{border-bottom:1px solid var(--border);justify-content:space-between;align-items:center;gap:12px;padding:16px 20px;display:flex}.table-header h3{font-size:15px;font-weight:600}.table-actions{flex-wrap:wrap;align-items:center;gap:8px;display:flex}.table-search{min-width:min(220px,100%);position:relative}.table-search input{border-radius:var(--radius-sm);width:min(220px,100%);padding:7px 10px 7px 34px;font-size:13px}.table-search svg{width:15px;height:15px;color:var(--text-muted);position:absolute;top:50%;left:10px;transform:translateY(-50%)}table{border-collapse:collapse;width:100%}thead th{text-align:left;text-transform:uppercase;letter-spacing:.05em;color:var(--text-muted);border-bottom:1px solid var(--border);background:var(--bg-primary);white-space:nowrap;padding:12px 20px;font-size:12px;font-weight:600}tbody tr{transition:background var(--transition)}tbody tr:hover{background:var(--bg-card-hover)}tbody td{border-bottom:1px solid var(--border);white-space:nowrap;padding:14px 20px;font-size:13.5px}tbody tr:last-child td{border-bottom:none}.nav-tabs{border-bottom:1px solid var(--border);gap:8px;margin-bottom:24px;padding-bottom:16px;display:flex}.nav-tab-btn{color:var(--text-secondary);border:1px solid var(--border);border-radius:var(--radius-md);cursor:pointer;transition:all var(--transition);background:#fff;align-items:center;gap:8px;padding:10px 16px;font-size:14px;font-weight:600;display:flex}.nav-tab-btn:hover{background:var(--bg-card-hover);color:var(--text-primary)}.nav-tab-btn.active{background:var(--accent-muted);color:var(--accent);border-color:var(--accent)}.student-info{align-items:center;gap:12px;display:flex}.student-avatar{color:#fff;border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;width:36px;height:36px;font-size:13px;font-weight:600;display:flex}.student-name{font-weight:500}.student-phone{color:var(--text-muted);margin-top:2px;font-size:12px}.badge{border-radius:20px;align-items:center;gap:5px;padding:4px 10px;font-size:12px;font-weight:500;display:inline-flex}.badge.active{background:var(--success-muted);color:#059669}.badge.inactive{background:var(--danger-muted);color:var(--danger)}.badge.beginner{background:var(--info-muted);color:#2563eb}.badge.intermediate{background:var(--warning-muted);color:#d97706}.badge.advanced{background:var(--accent-muted);color:var(--accent)}.badge.paid{background:var(--success-muted);color:#059669}.badge.pending{background:var(--warning-muted);color:#d97706}.badge.partial{background:var(--info-muted);color:#2563eb}.btn{border-radius:var(--radius-sm);transition:all var(--transition);white-space:nowrap;align-items:center;gap:8px;padding:8px 16px;font-size:13px;font-weight:500;display:inline-flex}.btn-primary{background:var(--accent);color:#fff;box-shadow:0 1px 3px #6366f14d}.btn-primary:hover{background:var(--accent-hover);transform:translateY(-1px);box-shadow:0 4px 12px #6366f14d}.btn-secondary{background:var(--bg-secondary);border:1px solid var(--border);color:var(--text-secondary)}.btn-secondary:hover{background:var(--bg-primary);border-color:var(--border-hover);color:var(--text-primary)}.btn-danger:hover{background:var(--danger);color:#fff}.btn-icon{border-radius:var(--radius-sm);border:1px solid var(--border);width:32px;height:32px;transition:all var(--transition);color:var(--text-secondary);justify-content:center;align-items:center;padding:0;display:inline-flex}.btn-icon:hover{background:var(--bg-primary);border-color:var(--border-hover);color:var(--text-primary)}.btn-icon svg{width:15px;height:15px}.row-actions{flex-wrap:wrap;gap:6px;display:flex}.action-buttons{align-items:center;gap:8px;display:flex}.ops-sheet-toolbar,.ops-sheet-bulkbar{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:12px;display:flex}.ops-sheet-toolbar-search{flex:320px}.ops-sheet-toolbar-actions,.ops-sheet-bulkbar-actions{flex-wrap:wrap}.ops-sheet-bulkbar-copy{gap:4px;display:grid}.ops-sheet-bulkbar-summary,.ops-sheet-bulkbar-note{color:var(--text-secondary);font-size:13px}.ops-sheet-filter-menu{position:relative}.ops-sheet-filter-trigger{border:1px solid var(--border);background:var(--bg-secondary);min-height:36px;color:var(--text-primary);cursor:pointer;border-radius:10px;align-items:center;gap:8px;padding:0 12px;font-size:13px;font-weight:600;list-style:none;display:inline-flex}.ops-sheet-filter-trigger::-webkit-details-marker{display:none}.ops-sheet-filter-menu[open] .ops-sheet-filter-trigger{border-color:var(--primary);color:var(--primary);background:var(--primary-soft)}.ops-sheet-filter-badge{min-width:20px;height:20px;color:var(--primary);background:#2563eb1f;border-radius:999px;justify-content:center;align-items:center;padding:0 6px;font-size:11px;font-weight:700;display:inline-flex}.ops-sheet-filter-panel{border:1px solid var(--border);background:var(--bg-card);width:min(520px,100vw - 48px);box-shadow:var(--shadow-lg);z-index:20;border-radius:14px;gap:12px;padding:14px;display:grid;position:absolute;top:calc(100% + 8px);right:0}.ops-sheet-filter-controls{grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:12px;display:grid}.ops-sheet-filter-control{color:var(--text-secondary);gap:6px;font-size:13px;display:grid}.ops-sheet-filter-control select{width:100%;min-height:38px}.ops-sheet-filter-footer{justify-content:flex-end;display:flex}.ops-sheet-viewstrip{gap:12px;display:grid}.ops-sheet-viewstrip-head{flex-wrap:wrap;justify-content:space-between;align-items:flex-start;gap:12px;display:flex}.ops-sheet-viewstrip-helper{color:var(--text-secondary);font-size:13px}.ops-sheet-chip-row,.ops-sheet-savedview-list{flex-wrap:wrap;gap:8px;display:flex}.ops-sheet-chip,.ops-sheet-savedview{border:1px solid var(--border);background:var(--surface);color:var(--text-primary);border-radius:999px;align-items:center;gap:6px;display:inline-flex}.ops-sheet-chip{padding:8px 12px}.ops-sheet-chip svg,.ops-sheet-savedview svg{color:var(--text-secondary)}.ops-sheet-savedview.is-active{border-color:var(--primary);background:var(--primary-soft)}.ops-sheet-savedview__apply,.ops-sheet-savedview__remove{background:0 0;border:0}.ops-sheet-savedview__apply{color:inherit;padding:8px 8px 8px 12px}.ops-sheet-savedview__remove{color:inherit;padding:8px 10px 8px 0}.class-workspace-shell.is-sheet-focus .table-shell-head{padding:14px 18px}.class-workspace-shell.is-sheet-focus .table-shell-title{font-size:15px}.class-workspace-shell.is-sheet-focus .table-shell-note{margin-top:2px;font-size:12px}.class-workspace-shell.is-sheet-focus .stats-grid{flex-wrap:wrap;gap:8px;margin-bottom:0;display:flex}.class-workspace-shell.is-sheet-focus .stat-card{min-width:160px;box-shadow:none;border-radius:12px;padding:12px 14px}.class-workspace-shell.is-sheet-focus .stat-card:hover{box-shadow:none;transform:none}.class-workspace-shell.is-sheet-focus .stat-card-header{margin-bottom:6px}.class-workspace-shell.is-sheet-focus .stat-card-header span{font-size:12px}.class-workspace-shell.is-sheet-focus .stat-icon{display:none}.class-workspace-shell.is-sheet-focus .stat-value{font-size:22px}.class-workspace-summary-strip{flex-wrap:wrap;gap:8px;padding-top:8px;display:flex}.class-workspace-summary-pill{color:var(--text-secondary);background:#f8fafcf2;border:1px solid #0f172a14;border-radius:999px;align-items:center;gap:6px;padding:8px 12px;font-size:12px;display:inline-flex}.class-workspace-summary-pill strong{color:var(--text-primary);font-size:13px}.class-workspace-tabshell.is-sheet-focus .payments-shell-body{padding:12px 14px 14px}.class-workspace-tabshell.is-sheet-focus .table-shell-head{padding:12px 14px}.class-workspace-tabshell.is-sheet-focus .segmented-tab-button{border-radius:8px;flex:none;min-width:auto;padding:9px 12px;font-size:12px}.class-workspace-students-sheet{gap:8px}.class-workspace-students-sheet .ops-sheet-filter-controls{grid-template-columns:repeat(auto-fit,minmax(150px,1fr))}.class-workspace-students-sheet .ops-sheet-viewstrip{gap:6px}.class-workspace-students-sheet .ops-sheet-viewstrip-helper{display:none}.class-workspace-students-sheet .ops-sheet-toolbar,.class-workspace-students-sheet .ops-sheet-bulkbar{gap:8px}.class-workspace-students-sheet .ops-sheet-toolbar-actions .btn,.class-workspace-students-sheet .ops-sheet-bulkbar-actions .btn{min-height:34px;padding:0 10px;font-size:12px}.class-workspace-students-sheet .ops-sheet-filter-control{gap:4px;font-size:12px}.class-workspace-students-sheet .ops-sheet-filter-control select{min-height:38px;padding:0 10px}.ops-datasheet-shell{border:1px solid var(--border);background:var(--bg-card);--ops-sheet-sticky-right-width:0px;border-radius:12px;flex-direction:column;min-height:0;display:flex;overflow:hidden}.ops-datasheet-shell .dsg-container{scrollbar-gutter:stable;scrollbar-width:thin;scrollbar-color:#94a3b8eb #e2e8f0d9;position:relative}.ops-datasheet-shell .dsg-container::-webkit-scrollbar{width:8px;height:10px}.ops-datasheet-shell .dsg-container::-webkit-scrollbar-track{background:#e2e8f0d9;border-radius:999px}.ops-datasheet-shell .dsg-container::-webkit-scrollbar-thumb{background:#94a3b8eb;border-radius:999px}.ops-datasheet-shell .dsg-container:after{content:"";width:var(--ops-sheet-sticky-right-width);background:var(--bg-card);box-shadow:-1px 0 0 var(--dsg-border-color);pointer-events:none;opacity:0;position:absolute;top:0;bottom:0;right:0}.ops-datasheet-shell:not(.is-sticky-right) .dsg-container:after{display:none}.ops-datasheet-shell .dsg-container>div{box-sizing:content-box;padding-right:var(--ops-sheet-sticky-right-width)}.ops-datasheet-shell .dsg-cell-sticky-right,.ops-datasheet-shell .dsg-cell-header.dsg-cell-sticky-right{z-index:2}.ops-datasheet-shell .dsg-cell-header.dsg-cell-sticky-right{z-index:3}.ops-datasheet-shell .dsg-cell:not(.dsg-cell-gutter):not(.dsg-cell-sticky-right){overflow:hidden}.ops-datasheet-shell .dsg-cell-sticky-right{background:var(--bg-card);box-shadow:-1px 0 0 var(--dsg-border-color)}.ops-datasheet-shell:not(.is-sticky-right) .dsg-container:after,.ops-datasheet-shell:not(.is-sticky-right) .dsg-cell-sticky-right{box-shadow:none}.ops-datasheet-shell.is-sticky-right 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