:root {
    --primary: #4f46e5;
    --primary-hover: #4338ca;
    --bg-color: #f3f4f6;
    --surface: #ffffff;
    --text-main: #111827;
    --text-muted: #6b7280;
    --border: #e5e7eb;
    --sidebar-width: 260px;
    --header-height: 70px;
    --radius-lg: 12px;
    --radius-md: 8px;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', sans-serif;
}

/* Fluid UI Scaling (1080p vs 1440p vs 4K) */
html {
    /* Base scaling para 1080p / Laptops / Tablets (Reduce 10% el tamaño general del sitio) */
    font-size: 14.5px; 
}

@media (min-width: 1921px) {
    html {
        /* Base scaling original para monitores 1440p y resoluciones anchas */
        font-size: 16px; 
    }
}

@media (min-width: 2561px) {
    html {
        /* Base scaling de ultra-alta definición (4K) */
        font-size: 18px; 
    }
}

body {
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.5;
}

a {
    text-decoration: none;
    color: inherit;
}

/* =============================================
   Tipografía y Utilidades
============================================= */
h1, h2, h3, h4, h5 { font-weight: 600; color: var(--text-main); }
h1 { font-size: 1.8rem; margin-bottom: 0.5rem; }
p { color: var(--text-muted); }

.text-primary { color: var(--primary); }
.text-muted { color: var(--text-muted); }

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.6rem 1.2rem;
    border-radius: var(--radius-md);
    font-weight: 500;
    font-size: 0.95rem;
    cursor: pointer;
    transition: all 0.2s ease;
    border: none;
    gap: 0.5rem;
}
.btn-primary {
    background-color: var(--primary);
    color: white;
}
.btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-1px);
}
.btn-block { width: 100%; }

/* =============================================
   App Layout (Dashboard)
============================================= */
.app-container {
    display: flex;
    height: 100vh;
    overflow: hidden;
}

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    background-color: var(--surface);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    transition: transform 0.3s ease;
    z-index: 100;
}

.sidebar-header {
    height: var(--header-height);
    display: flex;
    align-items: center;
    padding: 0 1.5rem;
    border-bottom: 1px solid var(--border);
}
.sidebar-logo {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.sidebar-nav {
    flex: 1;
    overflow-y: auto;
    padding: 1.5rem 1rem;
}
.nav-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    border-radius: var(--radius-md);
    color: var(--text-muted);
    font-weight: 500;
    margin-bottom: 0.5rem;
    transition: all 0.2s ease;
}
.nav-item:hover, .nav-item.active {
    background-color: rgba(79, 70, 229, 0.08); /* Primary semi-transparent */
    color: var(--primary);
}
.nav-item i { font-size: 1.25rem; }

/* Main Content */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

/* Top Header */
.top-header {
    height: var(--header-height);
    background-color: var(--surface);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 2rem;
}
.header-left { display: flex; align-items: center; gap: 1rem; }
.header-right { display: flex; align-items: center; gap: 1.5rem; }
.menu-toggle {
    display: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-muted);
}
.user-profile {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    cursor: pointer;
}
.avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background-color: var(--primary);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.9rem;
}

/* Page Content */
.page-content {
    flex: 1;
    overflow-y: auto;
    padding: 2rem;
}
.page-header { margin-bottom: 2rem; }

/* Tarjetas (Cards) */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
}
.card {
    background: var(--surface);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
    padding: 1.5rem;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}
.card-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    background-color: rgba(79, 70, 229, 0.1);
    color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: 1rem;
}
.card-title { font-size: 1.1rem; margin-bottom: 0.5rem; }
.card-metrics { font-size: 2rem; font-weight: 700; color: var(--text-main); line-height: 1; margin-bottom: 0.5rem; }

/* =============================================
   Pantalla de Login
============================================= */
.auth-wrapper {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #fefefe 0%, #f3f4f6 100%);
    padding: 1rem;
}
.auth-card {
    background: var(--surface);
    width: 100%;
    max-width: 420px;
    padding: 2.5rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    border: 1px solid rgba(255, 255, 255, 0.5);
}
.auth-header {
    text-align: center;
    margin-bottom: 2rem;
}
.auth-logo {
    font-size: 2rem;
    color: var(--primary);
    margin-bottom: 1rem;
}

.form-group { margin-bottom: 1.5rem; }
.form-label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    font-size: 0.9rem;
    color: var(--text-main);
}
.form-control {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-family: inherit;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}
.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

/* Formularios Varios */
.alert {
    padding: 1rem;
    border-radius: var(--radius-md);
    margin-bottom: 1.5rem;
    font-size: 0.9rem;
}
.alert-error {
    background-color: #fee2e2;
    color: #b91c1c;
    border: 1px solid #fecaca;
}

/* =============================================
   Responsive
============================================= */
@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        left: -100%;
        top: 0;
        bottom: 0;
        box-shadow: var(--shadow-lg);
    }
    .sidebar.open { left: 0; }
    .menu-toggle { display: block; }
    .top-header { padding: 0 1rem; }
    .page-content { padding: 1.5rem 1rem; }
}

/* =============================================
   Tablas de Datos (Data Tables)
============================================= */
.table-responsive {
    width: 100%;
    overflow-x: auto;
}
.data-table {
    width: 100%;
    border-collapse: collapse;
    white-space: normal; /* Previene colapso en pantallas de 1080p o menores */
}
.data-table th, .data-table td {
    padding: 1rem 1.5rem;
    text-align: left;
    border-bottom: 1px solid var(--border);
    line-height: 1.5; /* Mejora la lectura en saltos de línea */
}
.data-table th {
    background-color: var(--bg-color);
    color: var(--text-muted);
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    white-space: nowrap; /* Mantener la cabecera en una sola línea */
}
.data-table tbody tr:hover {
    background-color: rgba(243, 244, 246, 0.5);
}
.data-table td {
    color: var(--text-muted);
    font-size: 0.95rem;
    vertical-align: middle;
}
/* Evitar que la columna de acciones se rompa */
.data-table td:last-child, .data-table th:last-child {
    white-space: nowrap; 
    width: 1%;
}

/* =============================================
   Modales (Modals)
============================================= */
.modal-overlay {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(17, 24, 39, 0.6); z-index: 1000;
    display: flex; align-items: center; justify-content: center;
    opacity: 0; pointer-events: none; transition: opacity 0.2s;
}
.modal-overlay.active { opacity: 1; pointer-events: auto; }
.modal-content {
    background: var(--surface); padding: 2rem; border-radius: var(--radius-lg);
    width: 100%; max-width: 480px; max-height: 90vh; overflow-y: auto;
    transform: translateY(20px); transition: transform 0.2s;
    box-shadow: var(--shadow-lg);
}
.modal-overlay.active .modal-content { transform: translateY(0); }
.modal-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 1.5rem; border-bottom: 1px solid var(--border); padding-bottom: 1rem; }
.modal-title { font-size: 1.25rem; font-weight: 600; color: var(--text-main); }
.modal-close { background: none; border: none; font-size: 1.5rem; cursor: pointer; color: var(--text-muted); transition: color 0.2s; display: flex;}
.modal-close:hover { color: var(--text-main); }

/* =============================================
   Adaptabilidad Fina (Tables) para 1080p / Laptops
============================================= */
@media (max-width: 1920px) {
    .data-table th, .data-table td {
        padding: 0.6rem 0.8rem;
    }
    .data-table td {
        font-size: 0.90rem;
        line-height: 1.5;
    }
    .data-table th {
        font-size: 0.80rem;
    }
    
    /* Escalar etiquetas y badges internos a tamaño cómodo */
    .data-table td span, .data-table td div {
        font-size: 0.85rem !important;
    }
    .data-table td i {
        font-size: 1.15rem !important;
    }
}