:root{--primary-color: #2563eb;--primary-hover: #1d4ed8;--primary-light: #eff6ff;--secondary-color: #64748b;--success-color: #22c55e;--success-light: #f0fdf4;--warning-color: #f59e0b;--warning-light: #fffbeb;--danger-color: #ef4444;--danger-light: #fef2f2;--background-color: #f8fafc;--card-background: #ffffff;--text-primary: #0f172a;--text-secondary: #64748b;--text-muted: #94a3b8;--border-color: #e2e8f0;--sidebar-width: 260px;--transition: all .2s ease;--shadow-sm: 0 1px 2px rgba(0, 0, 0, .05);--shadow-md: 0 4px 6px -1px rgba(0, 0, 0, .07), 0 2px 4px -2px rgba(0, 0, 0, .05);--shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, .08), 0 4px 6px -4px rgba(0, 0, 0, .04);--radius-sm: .375rem;--radius-md: .5rem;--radius-lg: .75rem;--radius-xl: 1rem}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica 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var(--border-color);border-radius:var(--radius-lg);padding:1.5rem;box-shadow:var(--shadow-sm);transition:var(--transition)}.stat-card:hover{box-shadow:var(--shadow-md);transform:translateY(-2px)}.stat-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:.75rem}.stat-icon{width:40px;height:40px;border-radius:var(--radius-md);display:flex;align-items:center;justify-content:center;color:#fff}.stat-icon-blue{background:var(--primary-color)}.stat-icon-green{background:var(--success-color)}.stat-icon-amber{background:var(--warning-color)}.stat-value{font-size:2rem;font-weight:700;color:var(--text-primary);line-height:1.2}.stat-label{font-size:.8rem;color:var(--text-muted);margin-top:.25rem;font-weight:500;text-transform:uppercase;letter-spacing:.03em}.welcome-section{margin-bottom:2rem}.welcome-title{font-size:1.5rem;font-weight:600;color:var(--text-primary);margin-bottom:.25rem}.welcome-subtitle{color:var(--text-muted);font-size:.95rem}.page-header{margin-bottom:1.5rem}.page-header-top{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:1rem}.page-header 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tr.clickable:hover{background:var(--primary-light)}.empty-message{text-align:center;color:var(--text-muted);padding:3rem 1rem!important;font-size:.9rem}.badge{display:inline-flex;align-items:center;padding:.2rem .625rem;border-radius:9999px;font-size:.75rem;font-weight:600;letter-spacing:.02em}.badge-active{background:var(--success-light);color:#15803d}.badge-inactive{background:#f1f5f9;color:var(--text-secondary)}.badge-pending{background:var(--warning-light);color:#b45309}.badge-info{background:var(--primary-light);color:var(--primary-color)}.form-group{margin-bottom:1rem}.form-group label{display:block;font-size:.8rem;font-weight:600;color:var(--text-secondary);margin-bottom:.375rem}.form-group .required-star{color:var(--danger-color);margin-left:2px}.form-group .optional-hint{color:var(--text-muted);font-weight:400;font-size:.75rem}.form-group input,.form-group select,.form-group textarea{width:100%;padding:.5rem .75rem;border:1px solid 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ease;pointer-events:auto;cursor:pointer;max-width:360px}.toast-icon{display:flex;align-items:center;flex-shrink:0}.toast-success{background:#15803d;color:#fff}.toast-error{background:#b91c1c;color:#fff}.toast-info{background:var(--primary-color);color:#fff}@keyframes spin{to{transform:rotate(360deg)}}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes slideUp{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}@keyframes slideInRight{0%{opacity:0;transform:translate(100px)}to{opacity:1;transform:translate(0)}}@media(max-width:768px){.main-content{margin-left:0;padding:1rem}.sidebar{transform:translate(-100%)}.form-row{flex-direction:column;gap:0}.stats-grid,.detail-grid{grid-template-columns:1fr}.toast-container{left:1rem;right:1rem}.toast{max-width:100%}}.rent-history-table{width:100%;border-collapse:collapse;font-size:.85rem;margin-top:.5rem}.rent-history-table th,.rent-history-table td{padding:.5rem .75rem;text-align:left;border-bottom:1px solid var(--border-color)}.rent-history-table th{color:var(--text-secondary);font-weight:600;font-size:.8rem;text-transform:uppercase;letter-spacing:.02em}.rent-history-table tr:last-child td{border-bottom:none}.rent-period-card{border:1px solid var(--border-color);border-radius:var(--radius-md);padding:1rem;margin-bottom:.75rem;background:var(--background-color)}