:root {
    --primary: #2563eb; --primary-dark: #1d4ed8; --bg-light: #f3f4f6;
    --text-dark: #1f2937; --text-muted: #6b7280; --white: #ffffff;
    --border: #e5e7eb; --danger: #ef4444; --success: #10b981; --warning: #f59e0b;
}

* { margin: 0; padding: 0; box-sizing: border-box; font-family: 'Segoe UI', system-ui, sans-serif; }
body { background-color: var(--bg-light); color: var(--text-dark); line-height: 1.5; }

h1, h2, h3 { margin-bottom: 1rem; color: var(--text-dark); }
.text-center { text-align: center; } .mt-3 { margin-top: 1rem; }
.flex-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 1.5rem; flex-wrap: wrap; gap: 10px; }
.text-success { color: var(--success); } .text-warning { color: var(--warning); } .text-danger { color: var(--danger); }

/* Botones */
.btn { display: inline-block; padding: 0.5rem 1rem; border: none; border-radius: 4px; cursor: pointer; font-weight: 600; text-decoration: none; transition: background 0.2s; text-align: center;}
.btn-primary { background-color: var(--primary); color: var(--white); }
.btn-primary:hover { background-color: var(--primary-dark); }
.btn-danger { background-color: var(--danger); color: var(--white); }
.btn-warning { background-color: var(--warning); color: var(--white); }
.btn-warning:hover { background-color: #d97706; }
.btn-sm { padding: 0.25rem 0.5rem; font-size: 0.875rem; }
.btn-block { display: block; width: 100%; }

/* Formularios */
.form-group { margin-bottom: 1rem; }
.form-group label { display: block; margin-bottom: 0.5rem; font-weight: 500; font-size: 0.875rem; color: var(--text-dark); }
.form-group input, .form-group select, .form-group textarea { width: 100%; padding: 0.5rem; border: 1px solid var(--border); border-radius: 4px; font-size: 0.9rem; }
.form-control { padding: 0.5rem; border: 1px solid var(--border); border-radius: 4px; font-size: 0.9rem; }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }

/* Badges */
.badge { padding: 0.25rem 0.5rem; border-radius: 9999px; font-size: 0.75rem; font-weight: bold; color: white; display: inline-block; }
.badge-admin { background-color: var(--success); } .badge-gestor { background-color: var(--warning); } .badge-inquilino { background-color: var(--text-muted); }

/* Layout base */
.layout { display: flex; min-height: 100vh; position: relative; overflow-x: hidden; }
.sidebar { width: 250px; background-color: #111827; color: var(--white); display: flex; flex-direction: column; flex-shrink: 0; transition: transform 0.3s ease; z-index: 100; }
.brand { padding: 1.5rem 1rem; font-size: 1.1rem; font-weight: bold; border-bottom: 1px solid #374151; text-transform: uppercase; letter-spacing: 1px; text-align: center;}
.nav-menu { display: flex; flex-direction: column; padding: 1rem 0; overflow-y: auto; }
.nav-link { padding: 0.75rem 1.5rem; color: #d1d5db; text-decoration: none; transition: 0.2s; border-left: 4px solid transparent; }
.nav-link:hover, .nav-link.active { background-color: #1f2937; color: var(--white); border-left-color: var(--primary); }
.nav-divider { height: 1px; background-color: #374151; margin: 1rem 0; }

.main-content { flex: 1; display: flex; flex-direction: column; min-width: 0; }
.top-header { background: var(--white); padding: 1rem; display: flex; justify-content: space-between; align-items: center; border-bottom: 1px solid var(--border); }
.user-info { display: flex; align-items: center; gap: 1rem; }
.content-area { padding: 1.5rem; overflow-y: auto; flex: 1; }

.cards-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 1.5rem; }
.card { background: var(--white); padding: 1.5rem; border-radius: 8px; box-shadow: 0 1px 3px rgba(0,0,0,0.1); }
.card h3 { font-size: 1rem; color: var(--text-muted); margin-bottom: 0.5rem; font-weight: 500; }
.big-num { font-size: 2rem; font-weight: bold; }

/* Tablas Responsivas */
.table-responsive { overflow-x: auto; -webkit-overflow-scrolling: touch; border-radius: 8px; box-shadow: 0 1px 3px rgba(0,0,0,0.1); background: var(--white); }
.table { width: 100%; border-collapse: collapse; min-width: 700px; }
.table th, .table td { padding: 1rem; text-align: left; border-bottom: 1px solid var(--border); font-size: 0.9rem; vertical-align: top; }
.table th { background-color: #f9fafb; font-weight: 600; color: var(--text-muted); text-transform: uppercase; font-size: 0.8rem; }
.table tr:last-child td { border-bottom: none; }
.actions-col { white-space: nowrap; }
.actions-col .btn { margin-right: 5px; margin-bottom: 5px; }

/* Modal */
.modal { display: none; position: fixed; inset: 0; background: rgba(0,0,0,0.5); align-items: center; justify-content: center; z-index: 1050; padding: 1rem; }
.modal-content { background: var(--white); padding: 1.5rem; border-radius: 8px; width: 100%; max-width: 600px; position: relative; max-height: 90vh; overflow-y: auto; }
.close-modal { position: absolute; top: 1rem; right: 1rem; font-size: 1.5rem; cursor: pointer; color: var(--text-muted); line-height: 1; }

/* --- DISEÑO MÓVIL (RESPONSIVE) --- */
.mobile-menu-btn { display: none; font-size: 1.5rem; cursor: pointer; color: var(--text-dark); background: none; border: none; padding: 0.5rem; }
.sidebar-overlay { display: none; position: fixed; inset: 0; background: rgba(0,0,0,0.5); z-index: 90; }

@media (max-width: 768px) {
    .layout { flex-direction: column; }
    
    /* Menú lateral oculto por defecto */
    .sidebar { position: fixed; height: 100%; transform: translateX(-100%); }
    .sidebar.open { transform: translateX(0); }
    .sidebar-overlay.show { display: block; }
    
    /* Cabecera adaptada */
    .mobile-menu-btn { display: block; }
    .d-none-mobile { display: none; }
    .top-header { padding: 0.75rem 1rem; }
    
    /* Formularios de 1 columna */
    .form-grid { grid-template-columns: 1fr; }
    
    /* Adaptar botones y cabeceras */
    .flex-header { flex-direction: column; align-items: flex-start; }
    .header-actions { width: 100%; display: flex; flex-direction: column; gap: 10px; }
    .header-actions select, .header-actions button { width: 100% !important; }
}