:root{--bg: #f1f5f9;--surface: #ffffff;--border: #e2e8f0;--text: #0f172a;--text-muted: #64748b;--primary: #4f46e5;--primary-dark: #4338ca;--primary-light: #eef2ff;--success: #16a34a;--success-light: #f0fdf4;--danger: #dc2626;--danger-light: #fef2f2;--warning: #d97706;--warning-light: #fffbeb;--sidebar-bg: #111827;--sidebar-text: #cbd5e1;--sidebar-active: #4f46e5;--radius: 10px;--shadow: 0 1px 3px rgba(15, 23, 42, .08), 0 1px 2px rgba(15, 23, 42, .06);--shadow-md: 0 4px 12px rgba(15, 23, 42, .1);--sidebar-width: 240px;--sidebar-width-collapsed: 68px}*{box-sizing:border-box}body{margin:0;font-family:Segoe UI,system-ui,-apple-system,Roboto,sans-serif;background:var(--bg);color:var(--text);-webkit-font-smoothing:antialiased}button{font-family:inherit}a{color:inherit;text-decoration:none}.app-shell{display:flex;min-height:100vh}.sidebar{width:var(--sidebar-width);background:var(--sidebar-bg);color:var(--sidebar-text);display:flex;flex-direction:column;flex-shrink:0;transition:width .2s ease;overflow:hidden;position:sticky;top:0;height:100vh}.sidebar.collapsed{width:var(--sidebar-width-collapsed)}.sidebar-header{display:flex;align-items:center;gap:10px;padding:16px;min-height:64px;border-bottom:1px solid rgba(255,255,255,.08)}.hamburger-btn{background:transparent;border:none;color:#fff;cursor:pointer;width:36px;height:36px;flex-shrink:0;border-radius:8px;display:flex;align-items:center;justify-content:center;transition:background .15s}.hamburger-btn:hover{background:#ffffff1a}.hamburger-btn span{display:block;width:18px;height:2px;background:#fff;position:relative}.hamburger-btn span:before,.hamburger-btn span:after{content:"";position:absolute;left:0;width:18px;height:2px;background:#fff}.hamburger-btn span:before{top:-6px}.hamburger-btn span:after{top:6px}.sidebar-brand{font-weight:700;font-size:15px;color:#fff;white-space:nowrap;overflow:hidden}.sidebar-nav{flex:1;padding:12px 8px;overflow-y:auto;overflow-x:hidden}.sidebar-link{display:flex;align-items:center;gap:12px;padding:10px 12px;margin-bottom:2px;border-radius:8px;color:var(--sidebar-text);font-size:14px;white-space:nowrap;cursor:pointer;transition:background .15s,color .15s}.sidebar-link:hover{background:#ffffff0f;color:#fff}.sidebar-link.active{background:var(--sidebar-active);color:#fff}.sidebar-link .icon{flex-shrink:0;width:20px;height:20px;display:flex;align-items:center;justify-content:center}.sidebar-link .label{overflow:hidden;text-overflow:ellipsis}.sidebar-footer{padding:12px;font-size:11px;color:#64748b;border-top:1px solid rgba(255,255,255,.08);white-space:nowrap;overflow:hidden}.main-area{flex:1;min-width:0;display:flex;flex-direction:column}.topbar{height:64px;background:var(--surface);border-bottom:1px solid var(--border);display:flex;align-items:center;gap:14px;padding:0 24px;position:sticky;top:0;z-index:10}.topbar-title{font-size:18px;font-weight:600}.topbar .hamburger-btn span,.topbar .hamburger-btn span:before,.topbar .hamburger-btn span:after{background:var(--text)}.content{padding:24px;flex:1}@media(max-width:768px){.sidebar{position:fixed;z-index:40;height:100vh}.sidebar:not(.collapsed){width:240px}.sidebar.collapsed{width:0}.content{padding:16px}}.stat-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:16px;margin-bottom:24px}.stat-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:18px 20px;box-shadow:var(--shadow)}.stat-card .stat-label{font-size:13px;color:var(--text-muted);margin-bottom:6px}.stat-card .stat-value{font-size:24px;font-weight:700}.stat-card .stat-sub{font-size:12px;margin-top:6px;color:var(--text-muted)}.stat-card.cobrar .stat-value{color:var(--success)}.stat-card.pagar .stat-value{color:var(--danger)}.stat-card.vencido .stat-value{color:var(--warning)}.panel{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:20px;box-shadow:var(--shadow);margin-bottom:24px}.panel-title{font-size:15px;font-weight:600;margin:0 0 16px}.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:20px}@media(max-width:900px){.grid-2{grid-template-columns:1fr}}.page-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:20px;flex-wrap:wrap;gap:12px}.page-header h1{font-size:20px;margin:0}.toolbar{display:flex;gap:10px;align-items:center;flex-wrap:wrap}.search-input,.select-input,.form-input,.form-textarea,.form-select{border:1px solid var(--border);border-radius:8px;padding:9px 12px;font-size:14px;background:var(--surface);color:var(--text);outline:none}.search-input:focus,.select-input:focus,.form-input:focus,.form-textarea:focus,.form-select:focus{border-color:var(--primary)}.btn{display:inline-flex;align-items:center;gap:6px;border:none;border-radius:8px;padding:9px 16px;font-size:14px;font-weight:500;cursor:pointer;transition:background .15s,opacity .15s}.btn-primary{background:var(--primary);color:#fff}.btn-primary:hover{background:var(--primary-dark)}.btn-secondary{background:var(--bg);color:var(--text);border:1px solid var(--border)}.btn-secondary:hover{background:#e2e8f0}.btn-danger{background:var(--danger-light);color:var(--danger)}.btn-danger:hover{opacity:.8}.btn-sm{padding:6px 10px;font-size:13px}.btn-icon{padding:7px;border-radius:6px;background:transparent;color:var(--text-muted)}.btn-icon:hover{background:var(--bg);color:var(--text)}.btn:disabled{opacity:.5;cursor:not-allowed}.table-wrap{overflow-x:auto;border:1px solid var(--border);border-radius:var(--radius);background:var(--surface)}table{width:100%;border-collapse:collapse;font-size:14px}thead th{text-align:left;padding:12px 16px;background:#f8fafc;color:var(--text-muted);font-weight:600;font-size:12px;text-transform:uppercase;letter-spacing:.03em;border-bottom:1px solid var(--border);white-space:nowrap}tbody td{padding:12px 16px;border-bottom:1px solid var(--border);vertical-align:middle}tbody tr:last-child td{border-bottom:none}tbody tr:hover{background:#f8fafc}.text-muted{color:var(--text-muted)}.text-right{text-align:right}.actions-cell{display:flex;gap:6px;justify-content:flex-end}.empty-state{padding:48px 24px;text-align:center;color:var(--text-muted)}.badge{display:inline-flex;align-items:center;gap:4px;padding:3px 10px;border-radius:999px;font-size:12px;font-weight:600}.badge-pendiente{background:#f1f5f9;color:#475569}.badge-parcial{background:var(--warning-light);color:var(--warning)}.badge-pagado{background:var(--success-light);color:var(--success)}.badge-vencido{background:var(--danger-light);color:var(--danger)}.badge-anulado{background:#f1f5f9;color:#94a3b8}.dot{width:8px;height:8px;border-radius:50%;flex-shrink:0}.modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#0f172a80;display:flex;align-items:flex-start;justify-content:center;padding:40px 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12px;font-size:13px;margin-bottom:14px}.form-hint{font-size:12px;color:var(--text-muted);margin-top:4px}.loading-state{padding:48px;text-align:center;color:var(--text-muted)}