:root{--color-primary: #2563EB;--color-primary-hover: #1D4ED8;--color-primary-light: #DBEAFE;--color-success: #10B981;--color-success-bg: #ECFDF5;--color-warning: #F59E0B;--color-warning-bg: #FEF3C7;--color-danger: #EF4444;--color-danger-bg: #FEE2E2;--color-danger-hover: #DC2626;--color-bg: #F9FAFB;--color-surface: #FFFFFF;--color-border: #E5E7EB;--color-text-primary: #111827;--color-text-secondary: #4B5563;--color-text-tertiary: #9CA3AF;--space-1: 4px;--space-2: 8px;--space-3: 12px;--space-4: 16px;--space-5: 20px;--space-6: 24px;--space-7: 28px;--space-8: 32px;--space-10: 40px;--space-12: 48px;--font-family: "Inter", -apple-system, BlinkMacSystemFont, system-ui, sans-serif;--font-size-tiny: 12px;--font-size-small: 14px;--font-size-base: 16px;--font-size-lg: 18px;--font-size-xl: 24px;--font-size-2xl: 30px;--radius-sm: 6px;--radius-md: 8px;--radius-lg: 12px;--radius-full: 9999px;--shadow-sm: 0 1px 2px rgba(0, 0, 0, .05);--shadow-md: 0 1px 3px rgba(0, 0, 0, .1), 0 1px 2px rgba(0, 0, 0, .06);--shadow-lg: 0 4px 6px rgba(0, 0, 0, .07), 0 2px 4px rgba(0, 0, 0, .06);--shadow-hover: 0 10px 15px rgba(0, 0, 0, .1);--transition-fast: .15s ease-in-out;--transition-base: .2s ease-in-out;--transition-slow: .3s ease-in-out}*,*: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-family);color:var(--color-text-primary);background-color:var(--color-bg);line-height:1.5;min-height:100vh}a{color:var(--color-primary);text-decoration:none;transition:color var(--transition-fast)}a:hover{color:var(--color-primary-hover)}.container{max-width:1200px;margin:0 auto;padding:0 var(--space-4)}.page{padding:var(--space-6) 0;min-height:calc(100vh - 64px)}.page-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:var(--space-6);flex-wrap:wrap;gap:var(--space-3)}.page-title{font-size:var(--font-size-2xl);font-weight:700;color:var(--color-text-primary)}.metrics-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:var(--space-4);margin-bottom:var(--space-6)}.card{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-md);padding:var(--space-6);box-shadow:var(--shadow-sm);transition:box-shadow var(--transition-fast)}.card:hover{box-shadow:var(--shadow-md)}.card-title{font-size:var(--font-size-small);font-weight:500;color:var(--color-text-secondary);text-transform:uppercase;letter-spacing:.5px;margin-bottom:var(--space-2)}.card-value{font-size:var(--font-size-xl);font-weight:700;color:var(--color-text-primary)}.card-subtitle{font-size:var(--font-size-small);color:var(--color-text-secondary);margin-top:var(--space-1)}.progress-bar{width:100%;height:8px;background:var(--color-border);border-radius:var(--radius-full);overflow:hidden;margin-top:var(--space-3)}.progress-bar-fill{height:100%;border-radius:var(--radius-full);transition:width var(--transition-slow),background-color var(--transition-slow)}.progress-bar-fill.green{background:var(--color-success)}.progress-bar-fill.yellow{background:var(--color-warning)}.progress-bar-fill.red{background:var(--color-danger)}.badge{display:inline-flex;align-items:center;gap:var(--space-1);padding:2px 10px;border-radius:var(--radius-full);font-size:var(--font-size-tiny);font-weight:600;text-transform:uppercase;letter-spacing:.5px}.badge-paid{background:var(--color-success-bg);color:var(--color-success)}.badge-pending{background:var(--color-warning-bg);color:#92400e}.badge-overdue{background:var(--color-danger-bg);color:var(--color-danger)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:var(--space-2);padding:10px 20px;border-radius:var(--radius-md);font-size:var(--font-size-base);font-weight:500;font-family:var(--font-family);cursor:pointer;border:none;transition:all var(--transition-fast);min-height:44px;text-decoration:none}.btn:disabled{opacity:.5;cursor:not-allowed}.btn-primary{background:var(--color-primary);color:#fff}.btn-primary:hover:not(:disabled){background:var(--color-primary-hover);box-shadow:var(--shadow-md)}.btn-secondary{background:var(--color-surface);color:var(--color-text-primary);border:1px solid var(--color-border)}.btn-secondary:hover:not(:disabled){background:var(--color-bg)}.btn-danger{background:var(--color-danger);color:#fff}.btn-danger:hover:not(:disabled){background:var(--color-danger-hover)}.btn-sm{padding:6px 14px;font-size:var(--font-size-small);min-height:36px}.btn-icon{padding:8px;min-height:unset;border-radius:var(--radius-sm)}.form-group{margin-bottom:var(--space-4)}.form-label{display:block;font-size:var(--font-size-small);font-weight:500;color:var(--color-text-primary);margin-bottom:var(--space-1)}.form-label .required{color:var(--color-danger)}.form-input{width:100%;padding:10px 14px;border:1px solid var(--color-border);border-radius:var(--radius-md);font-size:var(--font-size-base);font-family:var(--font-family);color:var(--color-text-primary);background:var(--color-surface);transition:border-color var(--transition-fast),box-shadow var(--transition-fast);min-height:44px}.form-input:focus{outline:none;border-color:var(--color-primary);box-shadow:0 0 0 3px var(--color-primary-light)}.form-input.error{border-color:var(--color-danger);box-shadow:0 0 0 3px var(--color-danger-bg)}.form-input:disabled{background:var(--color-bg);color:var(--color-text-secondary);cursor:not-allowed}.form-error{font-size:var(--font-size-small);color:var(--color-danger);margin-top:var(--space-1)}.form-help{font-size:var(--font-size-small);color:var(--color-text-secondary);margin-top:var(--space-1)}select.form-input{appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3E%3Cpath stroke='%236b7280' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='M6 8l4 4 4-4'/%3E%3C/svg%3E");background-position:right 10px center;background-repeat:no-repeat;background-size:20px;padding-right:38px}.tenant-row{display:flex;align-items:center;padding:var(--space-4);border-radius:var(--radius-md);cursor:pointer;transition:all var(--transition-fast);gap:var(--space-3);border:1px solid transparent}.tenant-row:hover{box-shadow:var(--shadow-lg);transform:translateY(-1px)}.tenant-row.paid{background:var(--color-success-bg)}.tenant-row.pending{background:var(--color-warning-bg)}.tenant-row.overdue{background:var(--color-danger-bg)}.tenant-row .house-number{font-weight:700;font-size:var(--font-size-base);min-width:40px;color:var(--color-text-primary)}.tenant-row .tenant-info{flex:1;min-width:0}.tenant-row .tenant-name{font-weight:600;color:var(--color-text-primary)}.tenant-row .tenant-meta{font-size:var(--font-size-small);color:var(--color-text-secondary)}.tenant-row .tenant-amount{text-align:right;white-space:nowrap}.tenant-row .amount-value{font-weight:600;font-size:var(--font-size-base)}.tenant-row .amount-label{font-size:var(--font-size-tiny);color:var(--color-text-secondary)}.tenant-list{display:flex;flex-direction:column;gap:var(--space-2)}.navbar{background:var(--color-surface);border-bottom:1px solid var(--color-border);padding:0 var(--space-4);height:64px;display:flex;align-items:center;position:sticky;top:0;z-index:100;box-shadow:var(--shadow-sm)}.navbar-inner{max-width:1200px;margin:0 auto;width:100%;display:flex;align-items:center;justify-content:space-between}.navbar-brand{font-size:var(--font-size-lg);font-weight:700;color:var(--color-primary);display:flex;align-items:center;gap:var(--space-2)}.navbar-nav{display:flex;align-items:center;gap:var(--space-1);list-style:none}.nav-link{display:flex;align-items:center;gap:var(--space-2);padding:var(--space-2) var(--space-3);border-radius:var(--radius-md);font-size:var(--font-size-small);font-weight:500;color:var(--color-text-secondary);transition:all var(--transition-fast);text-decoration:none;position:relative}.nav-link:hover,.nav-link.active{background:var(--color-primary-light);color:var(--color-primary)}.nav-badge{position:absolute;top:2px;right:2px;background:var(--color-danger);color:#fff;font-size:10px;font-weight:700;width:18px;height:18px;border-radius:50%;display:flex;align-items:center;justify-content:center}.modal-overlay{position:fixed;inset:0;background:#00000080;display:flex;align-items:center;justify-content:center;z-index:200;padding:var(--space-4);animation:fadeIn var(--transition-base)}.modal{background:var(--color-surface);border-radius:var(--radius-lg);padding:var(--space-6);max-width:480px;width:100%;box-shadow:var(--shadow-hover);animation:slideUp var(--transition-base)}.modal-title{font-size:var(--font-size-lg);font-weight:600;margin-bottom:var(--space-4)}.modal-actions{display:flex;gap:var(--space-3);justify-content:flex-end;margin-top:var(--space-6)}.toast-container{position:fixed;top:var(--space-4);right:var(--space-4);z-index:300;display:flex;flex-direction:column;gap:var(--space-2)}.toast{padding:var(--space-3) var(--space-4);border-radius:var(--radius-md);font-size:var(--font-size-small);font-weight:500;color:#fff;box-shadow:var(--shadow-lg);animation:slideIn var(--transition-base);display:flex;align-items:center;gap:var(--space-2);min-width:280px}.toast-success{background:var(--color-success)}.toast-error{background:var(--color-danger)}.toast-close{margin-left:auto;cursor:pointer;opacity:.8;background:none;border:none;color:#fff;font-size:var(--font-size-lg)}.table-wrapper{overflow-x:auto;border-radius:var(--radius-md);border:1px solid var(--color-border)}.table{width:100%;border-collapse:collapse;font-size:var(--font-size-small)}.table th{background:var(--color-bg);padding:var(--space-3) var(--space-4);text-align:left;font-weight:600;color:var(--color-text-secondary);border-bottom:1px solid var(--color-border);white-space:nowrap}.table td{padding:var(--space-3) var(--space-4);border-bottom:1px solid var(--color-border);color:var(--color-text-primary)}.table tr:last-child td{border-bottom:none}.table tr:hover td{background:var(--color-bg)}.skeleton{background:linear-gradient(90deg,var(--color-border) 25%,#f0f0f0 50%,var(--color-border) 75%);background-size:200% 100%;animation:shimmer 1.5s infinite;border-radius:var(--radius-sm)}.spinner{width:24px;height:24px;border:3px solid var(--color-border);border-top-color:var(--color-primary);border-radius:50%;animation:spin .6s linear infinite}.spinner-lg{width:40px;height:40px;border-width:4px}.empty-state{text-align:center;padding:var(--space-12) var(--space-6);color:var(--color-text-secondary)}.empty-state-icon{font-size:48px;margin-bottom:var(--space-4)}.empty-state-title{font-size:var(--font-size-lg);font-weight:600;color:var(--color-text-primary);margin-bottom:var(--space-2)}.loading-center{display:flex;justify-content:center;align-items:center;padding:var(--space-12)}.search-bar{position:relative;max-width:360px}.search-bar .search-icon{position:absolute;left:12px;top:50%;transform:translateY(-50%);color:var(--color-text-tertiary);font-size:var(--font-size-base)}.search-bar input{padding-left:38px}.detail-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:var(--space-4);margin-bottom:var(--space-6)}.detail-item{display:flex;flex-direction:column;gap:var(--space-1)}.detail-label{font-size:var(--font-size-small);color:var(--color-text-secondary);font-weight:500}.detail-value{font-size:var(--font-size-base);font-weight:600;color:var(--color-text-primary)}.login-page{display:flex;align-items:center;justify-content:center;min-height:100vh;background:linear-gradient(135deg,#1e3a5f,#2563eb,#3b82f6);padding:var(--space-4)}.login-card{background:var(--color-surface);border-radius:var(--radius-lg);padding:var(--space-10);width:100%;max-width:400px;box-shadow:var(--shadow-hover)}.login-logo{text-align:center;margin-bottom:var(--space-8)}.login-logo h1{font-size:var(--font-size-2xl);color:var(--color-primary);font-weight:700}.login-logo p{color:var(--color-text-secondary);font-size:var(--font-size-small);margin-top:var(--space-1)}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes slideUp{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}@keyframes slideIn{0%{opacity:0;transform:translate(100px)}to{opacity:1;transform:translate(0)}}@keyframes shimmer{0%{background-position:-200% 0}to{background-position:200% 0}}@keyframes spin{to{transform:rotate(360deg)}}@media(min-width:768px){.container{padding:0 var(--space-6)}.page{padding:var(--space-8) 0}.metrics-grid{grid-template-columns:repeat(4,1fr)}}@media(max-width:767px){.navbar-nav{position:fixed;bottom:0;left:0;right:0;background:var(--color-surface);border-top:1px solid var(--color-border);padding:var(--space-2);justify-content:space-around;z-index:100;box-shadow:0 -2px 10px #0000001a}.nav-link span.nav-text{display:none}.nav-link{flex-direction:column;font-size:var(--font-size-tiny);padding:var(--space-1) var(--space-2)}.page{padding-bottom:80px}.page-title{font-size:var(--font-size-xl)}.modal{margin:var(--space-4)}}