:root{--primary-blue:#0056b3;--primary-hover:#003d80;--accent-red:#d32f2f;--bg-dark:#121212;--bg-light:#1f1f1f;--bg-input:#2c2c2c;--text-on-dark:#fff;--text-on-light:#fff;--text-subtle:#b0b0b0;--radius-md:12px;--radius-lg:16px;--sidebar-width:260px}*{box-sizing:border-box;margin:0;padding:0}body{background-color:var(--bg-dark);color:var(--text-on-dark);-webkit-font-smoothing:antialiased;font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif}h1,h2,h3,h4{color:var(--primary-blue);margin-bottom:.5rem;font-weight:700}.app-container{background-color:var(--bg-dark);min-height:100vh;display:flex}.sidebar{width:var(--sidebar-width);background-color:var(--bg-dark);z-index:50;border-right:1px solid #333;flex-direction:column;height:100vh;transition:transform .3s;display:flex;position:fixed;top:0;left:0}.nav-menu{flex-direction:column;flex-grow:1;gap:8px;padding:24px 16px;display:flex}.nav-item{border-radius:var(--radius-md);color:var(--text-subtle);cursor:pointer;align-items:center;gap:12px;padding:12px 16px;font-weight:500;text-decoration:none;transition:all .2s;display:flex}.nav-item:hover{color:var(--text-on-dark);background-color:#0056b31a}.nav-item.active{background-color:var(--primary-blue);color:#fff;box-shadow:0 4px 12px #0056b34d}.main-content{margin-left:var(--sidebar-width);background-color:var(--bg-dark);flex-direction:column;flex-grow:1;min-height:100vh;display:flex}.topbar{background-color:var(--bg-dark);z-index:40;border-bottom:1px solid #333;justify-content:space-between;align-items:center;padding:16px 32px;display:flex;position:sticky;top:0}.topbar h2{color:var(--text-on-dark);margin:0}.topbar-logo{object-fit:contain;width:auto;height:32px;margin-right:16px}.content-view{padding:32px}.stats-grid{grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:24px;margin-bottom:32px;display:grid}.stat-card,.login-card,.data-table,.chart-container,.actions-container,.modal{background-color:var(--bg-light);border-radius:var(--radius-lg);color:var(--text-on-light);border:1px solid #2a2a2a;flex-direction:column;justify-content:center;padding:24px;display:flex;box-shadow:0 4px 10px #0000004d}.stat-card{aspect-ratio:1;text-align:center;transition:transform .2s}.stat-card:hover{border-color:var(--primary-blue);transform:translateY(-5px)}.stat-card.red-accent{border:4px solid var(--accent-red)}.stat-card.danger{border-left:4px solid #ef4444}.stat-label{color:var(--text-subtle);text-transform:uppercase;letter-spacing:1px;margin-bottom:12px;font-size:.9rem;font-weight:600}.stat-value{color:#fff;font-size:2.5rem;font-weight:800;line-height:1}.skeleton{background-color:#2a2a2a;animation:1.5s infinite pulse}@keyframes pulse{0%{opacity:.6}50%{opacity:.3}to{opacity:.6}}.login-page{background-color:var(--bg-dark);justify-content:center;align-items:center;min-height:100vh;padding:20px;display:flex}.login-card{text-align:center;width:100%;max-width:420px}.login-logo-container{justify-content:center;align-items:center;width:100%;margin-bottom:16px;display:flex;overflow:hidden}.login-logo{object-fit:contain;width:auto;max-width:180px;height:auto;max-height:180px}input,select,textarea{background-color:var(--bg-input);border-radius:var(--radius-md);color:#fff;border:1px solid #444;width:100%;margin-bottom:16px;padding:14px;font-size:1rem;transition:border-color .2s}input:focus,select:focus{border-color:var(--primary-blue);background-color:#333;outline:none}.input-group label{text-align:left;color:var(--text-subtle);margin-bottom:6px;font-size:.9rem;font-weight:600;display:block}button,.btn{border-radius:var(--radius-md);cursor:pointer;border:none;justify-content:center;align-items:center;gap:8px;padding:12px 24px;font-weight:700;transition:all .2s;display:inline-flex}.btn-login,.btn-primary{background-color:var(--primary-blue);color:#fff;width:100%}.btn-login:hover,.btn-primary:hover{background-color:var(--primary-hover);transform:translateY(-2px)}.btn-outline{border:2px solid var(--primary-blue);color:var(--primary-blue);background:0 0}.btn-sm{padding:6px 12px;font-size:.85rem}.data-table{width:100%;padding:0;display:block;overflow:hidden}.data-table table{border-collapse:collapse;width:100%}.data-table th{color:var(--text-subtle);text-align:left;background-color:#2c2c2c;padding:16px;font-size:.9rem;font-weight:600}.data-table td{color:#fff;border-bottom:1px solid #333;padding:16px}.data-table tr:hover{background-color:#2a2a2a}.modal-overlay{z-index:100;background:#000c;justify-content:center;align-items:center;display:flex;position:fixed;inset:0}.modal{background:var(--bg-light);border-radius:var(--radius-lg);width:90%;max-width:500px;color:var(--text-on-light);padding:32px}.status-badge{border-radius:20px;padding:4px 12px;font-size:.75rem;font-weight:700;display:inline-block}.status-paid,.status-occupied,.status-completed{color:#4da6ff;background-color:#0056b333}.status-pending,.status-unpaid,.status-vacant{color:#ef4444;background-color:#d32f2f33}.tabs-container{border-bottom:2px solid #333;gap:.5rem;margin-bottom:1.5rem;padding-bottom:0;display:flex}.tab-btn{color:#64748b;cursor:pointer;background:0 0;border:none;border-bottom:3px solid #0000;align-items:center;gap:.5rem;margin-bottom:-2px;padding:.75rem 1.5rem;font-weight:600;transition:all .2s;display:flex}.tab-btn.active{color:var(--primary-blue);border-bottom-color:var(--accent-red)}.messages-layout{grid-template-columns:1fr 1.5fr;gap:24px;display:grid}.tenant-list-card{border:1px solid #333;flex-direction:column;height:500px;padding:0;display:flex}.tenant-scroll{flex:1;overflow-y:auto}.tenant-item{cursor:pointer;border-bottom:1px solid #333;justify-content:space-between;align-items:center;padding:1rem 1.5rem;transition:background .2s;display:flex}.tenant-item:hover{background:#252525}.tenant-item.selected{border-left:4px solid var(--primary-blue);background:#0056b326}.tenant-info h4{color:var(--text-on-dark);margin:0;font-size:.95rem}.badge{border-radius:12px;padding:4px 8px;font-size:.75rem;font-weight:600}.badge-red{color:var(--accent-red);background:#d32f2f33}.badge-green{color:#22c55e;background:#22c55e33}.badge-yellow{color:#d97706;background:#f59e0b33}.message-textarea{width:100%;color:var(--text-on-dark);resize:vertical;background:#1a1a1a;border:1px solid #333;border-radius:8px;margin-bottom:1.5rem;padding:1rem;font-family:inherit}.message-textarea:focus{border-color:var(--primary-blue);outline:none}@media (max-width:768px){.sidebar{transform:translate(-100%)}.sidebar.active{transform:translate(0)}.main-content{margin-left:0}.content-view{padding:16px}.topbar-logo{height:24px}.topbar h2{display:none}.stats-grid{grid-template-columns:repeat(2,1fr);gap:12px}.stat-value{font-size:1.5rem}.stat-card{padding:12px}.messages-layout{grid-template-columns:1fr}}.install-overlay{z-index:9999;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);background:#000000d9;justify-content:center;align-items:center;padding:20px;display:flex;position:fixed;inset:0}.install-modal{background-color:var(--bg-light);border-radius:var(--radius-lg);text-align:center;border:1px solid #333;width:100%;max-width:380px;padding:32px;animation:.3s ease-out slideUp;position:relative;box-shadow:0 10px 25px #00000080}@keyframes slideUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}.install-close{color:var(--text-subtle);cursor:pointer;background:0 0;border:none;padding:4px;transition:color .2s;position:absolute;top:12px;right:12px}.install-close:hover{color:#fff}.install-icon{width:80px;height:80px;color:var(--primary-blue);background:#0056b326;border-radius:50%;justify-content:center;align-items:center;margin:0 auto 20px;display:flex}.install-modal h3{color:#fff;margin-bottom:8px}