/* Variables de colores institucionales */
:root {
    --color-white: #ffffff;
    --color-gray-light: #f8f9fa;
    --color-gray-medium: #6c757d;
    --color-gray-dark: #495057;
    --color-primary: #495057;
    --color-secondary: #6c757d;
    --color-success: #28a745;
    --color-warning: #ffc107;
    --color-danger: #dc3545;
    --color-info: #17a2b8;
    --shadow-light: 0 2px 4px rgba(0,0,0,0.1);
    --shadow-medium: 0 4px 8px rgba(0,0,0,0.15);
    --border-radius: 8px;
}

/* Reset y estilos base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--color-gray-light);
    color: var(--color-gray-dark);
    line-height: 1.6;
}

/* Header y navegación */
.navbar {
    background: linear-gradient(135deg, var(--color-white), var(--color-gray-light));
    box-shadow: var(--shadow-light);
    border-bottom: 1px solid #e9ecef;
}

.navbar-brand {
    font-weight: 600;
    color: var(--color-primary) !important;
}

.navbar-brand img {
    height: 40px;
    margin-right: 10px;
}

.nav-link {
    color: var(--color-gray-dark) !important;
    font-weight: 500;
    transition: color 0.3s ease;
}

.nav-link:hover {
    color: var(--color-primary) !important;
}

/* Sidebar */
.sidebar {
    background: var(--color-white);
    box-shadow: var(--shadow-medium);
    min-height: 100vh;
    position: fixed;
    top: 0;
    left: 0;
    width: 250px;
    z-index: 1000;
    transition: transform 0.3s ease;
}

.sidebar-header {
    background: linear-gradient(135deg, var(--color-primary), var(--color-gray-medium));
    color: var(--color-white);
    padding: 20px;
    text-align: center;
}

.sidebar-header img {
    height: 50px;
    margin-bottom: 10px;
}

.sidebar-menu {
    padding: 20px 0;
}

.sidebar-menu .nav-item {
    margin-bottom: 5px;
}

.sidebar-menu .nav-link {
    color: var(--color-gray-dark);
    padding: 12px 20px;
    border-radius: 0;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
}

.sidebar-menu .nav-link:hover {
    background-color: var(--color-gray-light);
    color: var(--color-primary);
    transform: translateX(5px);
}

.sidebar-menu .nav-link.active {
    background-color: var(--color-primary);
    color: var(--color-white);
}

.sidebar-menu .nav-link i {
    margin-right: 10px;
    width: 20px;
    text-align: center;
}

/* Contenido principal */
.main-content {
    margin-left: 250px;
    padding: 20px;
    min-height: 100vh;
    background-color: var(--color-gray-light);
}

/* Cards */
.card {
    background: var(--color-white);
    border: none;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-light);
    transition: box-shadow 0.3s ease;
}

.card:hover {
    box-shadow: var(--shadow-medium);
}

.card-header {
    background: linear-gradient(135deg, var(--color-white), var(--color-gray-light));
    border-bottom: 1px solid #e9ecef;
    font-weight: 600;
    color: var(--color-primary);
}

/* Botones */
.btn {
    border-radius: var(--border-radius);
    font-weight: 500;
    transition: all 0.3s ease;
    border: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary), var(--color-gray-medium));
    color: var(--color-white);
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--color-gray-medium), var(--color-primary));
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

.btn-secondary {
    background: var(--color-gray-medium);
    color: var(--color-white);
}

.btn-success {
    background: linear-gradient(135deg, var(--color-success), #20c997);
    color: var(--color-white);
}

.btn-warning {
    background: linear-gradient(135deg, var(--color-warning), #ff8c00);
    color: var(--color-white);
}

.btn-danger {
    background: linear-gradient(135deg, var(--color-danger), #c82333);
    color: var(--color-white);
}

.btn-info {
    background: linear-gradient(135deg, var(--color-info), #138496);
    color: var(--color-white);
}

/* Formularios */
.form-control {
    border: 1px solid #e9ecef;
    border-radius: var(--border-radius);
    padding: 10px 15px;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.form-control:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 0.2rem rgba(73, 80, 87, 0.25);
}

.form-label {
    font-weight: 600;
    color: var(--color-gray-dark);
    margin-bottom: 8px;
}

/* Tablas */
.table {
    background: var(--color-white);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow-light);
    width: 100%;
}

.table thead th {
    background: linear-gradient(135deg, var(--color-primary), var(--color-gray-medium));
    color: var(--color-white);
    border: none;
    font-weight: 600;
    padding: 15px;
}

.table tbody tr {
    transition: background-color 0.3s ease;
}

.table tbody tr:hover {
    background-color: var(--color-gray-light);
}

/* Tabla responsive wrapper */
.table-responsive {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    border-radius: var(--border-radius);
}

.table-responsive .table {
    margin-bottom: 0;
}

/* Modales */
.modal-content {
    border: none;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-medium);
}

.modal-header {
    background: linear-gradient(135deg, var(--color-primary), var(--color-gray-medium));
    color: var(--color-white);
    border-bottom: none;
    border-radius: var(--border-radius) var(--border-radius) 0 0;
}

.modal-footer {
    border-top: 1px solid #e9ecef;
    background-color: var(--color-gray-light);
}

/* Login */
.login-container {
    min-height: 100vh;
    background: linear-gradient(135deg, var(--color-gray-light), var(--color-white));
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.login-card {
    background: var(--color-white);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-medium);
    padding: 40px;
    width: 100%;
    max-width: 400px;
}

.login-header {
    text-align: center;
    margin-bottom: 30px;
}

.login-header img {
    height: 80px;
    margin-bottom: 20px;
}

.login-header h2 {
    color: var(--color-primary);
    font-weight: 600;
}

/* Estadísticas */
.stats-card {
    background: linear-gradient(135deg, var(--color-white), var(--color-gray-light));
    border-radius: var(--border-radius);
    padding: 20px;
    text-align: center;
    box-shadow: var(--shadow-light);
    transition: transform 0.3s ease;
}

.stats-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-medium);
}

.stats-number {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 10px;
}

.stats-label {
    color: var(--color-gray-medium);
    font-weight: 500;
}

/* Responsive */
@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
        width: 220px;
    }
    
    .sidebar.show {
        transform: translateX(0);
    }
    
    .main-content {
        margin-left: 0;
        padding: 15px;
    }
    
    .navbar {
        padding: 10px 15px;
    }
    
    .navbar-brand {
        font-size: 0.9rem;
    }
    
    .navbar-brand img {
        height: 30px;
    }
    
    .navbar-toggler {
        display: block;
    }
    
    .card {
        margin-bottom: 15px;
    }
    
    .card-header {
        padding: 12px 15px;
        font-size: 0.9rem;
    }
    
    .card-body {
        padding: 15px;
    }
    
    .stats-card {
        padding: 15px;
        margin-bottom: 15px;
    }
    
    .stats-number {
        font-size: 2rem;
    }
    
    .stats-label {
        font-size: 0.85rem;
    }
    
    .table {
        font-size: 0.85rem;
    }
    
    .table thead th {
        padding: 10px 8px;
        font-size: 0.8rem;
    }
    
    .table tbody td {
        padding: 8px;
    }
    
    .btn {
        font-size: 0.85rem;
        padding: 8px 12px;
    }
    
    .btn-sm {
        font-size: 0.75rem;
        padding: 4px 8px;
    }
    
    .form-control {
        font-size: 0.9rem;
        padding: 8px 12px;
    }
    
    .form-label {
        font-size: 0.9rem;
    }
    
    .modal-content {
        margin: 10px;
    }
    
    .modal-header {
        padding: 12px 15px;
    }
    
    .modal-body {
        padding: 15px;
    }
    
    .modal-footer {
        padding: 10px 15px;
    }
    
    .login-card {
        padding: 25px;
        margin: 10px;
    }
    
    .d-flex.justify-content-between {
        flex-direction: column;
        gap: 15px;
    }
    
    .d-flex.justify-content-between > * {
        width: 100%;
    }
    
    .list-group-item {
        padding: 10px 12px;
        font-size: 0.85rem;
    }
    
    .alert {
        font-size: 0.85rem;
        padding: 10px 12px;
    }
    
    .badge {
        font-size: 0.75rem;
        padding: 4px 8px;
    }
    
    h1, .h1 {
        font-size: 1.5rem;
    }
    
    h2, .h2 {
        font-size: 1.3rem;
    }
    
    h3, .h3 {
        font-size: 1.1rem;
    }
    
    h4, .h4 {
        font-size: 1rem;
    }
    
    h5, .h5 {
        font-size: 0.95rem;
    }
}

@media (max-width: 480px) {
    .main-content {
        padding: 10px;
    }
    
    .card-header {
        padding: 10px 12px;
        font-size: 0.85rem;
    }
    
    .card-body {
        padding: 12px;
    }
    
    .stats-number {
        font-size: 1.5rem;
    }
    
    .table {
        font-size: 0.75rem;
    }
    
    .table thead th {
        padding: 8px 5px;
        font-size: 0.7rem;
    }
    
    .table tbody td {
        padding: 6px 5px;
    }
    
    .table-responsive {
        font-size: 0.75rem;
    }
    
    .btn {
        font-size: 0.8rem;
        padding: 6px 10px;
    }
    
    .dropdown-menu {
        font-size: 0.85rem;
    }
    
    .navbar-brand {
        font-size: 0.8rem;
    }
    
    /* Formularios en móvil */
    .form-row,
    .row .col-md-6,
    .row .col-md-4,
    .row .col-md-3 {
        margin-bottom: 15px;
    }
    
    /* Cards apiladas en móvil */
    .row .col-xl-6,
    .row .col-xl-4,
    .row .col-xl-3 {
        margin-bottom: 15px;
    }
}

/* Estilos para tablas en modo tarjeta en móviles */
@media (max-width: 768px) {
    .table-mobile-card {
        display: block;
    }
    
    .table-mobile-card thead {
        display: none;
    }
    
    .table-mobile-card tbody,
    .table-mobile-card tr,
    .table-mobile-card td {
        display: block;
        width: 100%;
    }
    
    .table-mobile-card tr {
        border: 1px solid #e9ecef;
        border-radius: var(--border-radius);
        margin-bottom: 15px;
        padding: 10px;
        background: var(--color-white);
        box-shadow: var(--shadow-light);
    }
    
    .table-mobile-card td {
        border: none;
        padding: 8px 0;
        text-align: left;
        position: relative;
        padding-left: 40%;
    }
    
    .table-mobile-card td:before {
        content: attr(data-label);
        position: absolute;
        left: 0;
        width: 35%;
        font-weight: 600;
        color: var(--color-primary);
    }
}

/* Utilidades */
.text-primary {
    color: var(--color-primary) !important;
}

.bg-primary {
    background-color: var(--color-primary) !important;
}

.border-primary {
    border-color: var(--color-primary) !important;
}

/* Animaciones */
.fade-in {
    animation: fadeIn 0.5s ease-in;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Scrollbar personalizada */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--color-gray-light);
}

::-webkit-scrollbar-thumb {
    background: var(--color-gray-medium);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-primary);
}