/* Variables CSS */
:root {
    --primary-color: #0d6efd;
    --secondary-color: #6c757d;
    --success-color: #198754;
    --danger-color: #dc3545;
    --warning-color: #ffc107;
    --info-color: #0dcaf0;
    --light-color: #f8f9fa;
    --dark-color: #212529;
    --sidebar-bg: #f8f9fa;
    --sidebar-hover: #e9ecef;
}

/* Estilos generales */
body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--light-color);
    min-height: 100vh;
}

.h-100 {
    height: 100vh;
}

/* Página de Login */
.welcome-section {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    position: relative;
    overflow: hidden;
}

.welcome-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 25% 25%, rgba(255,255,255,0.1) 0%, transparent 50%),
        radial-gradient(circle at 75% 75%, rgba(255,255,255,0.1) 0%, transparent 50%);
    pointer-events: none;
}

.welcome-logo {
    position: relative;
    z-index: 2;
}

.welcome-logo h1 {
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

.features-grid .feature-card {
    background: rgba(255,255,255,0.1);
    border-radius: 15px;
    padding: 1.5rem;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255,255,255,0.2);
    transition: transform 0.3s ease, background 0.3s ease;
}

.features-grid .feature-card:hover {
    transform: translateY(-5px);
    background: rgba(255,255,255,0.2);
}

.login-section {
    background: linear-gradient(to bottom, #f8f9fa, #e9ecef);
    padding: 2rem;
}

.login-container {
    max-width: 400px;
    margin: 0 auto;
}

.card {
    border-radius: 15px;
    overflow: hidden;
}

.card-body {
    border-radius: 15px;
}

.form-control-lg {
    border-radius: 10px;
    border: 2px solid #e9ecef;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.form-control-lg:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(13, 110, 253, 0.25);
}

.btn-lg {
    border-radius: 10px;
    padding: 0.75rem 1.5rem;
    font-weight: 600;
    transition: all 0.3s ease;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(13, 110, 253, 0.4);
}

/* Dashboard */
.sidebar {
    min-height: calc(100vh - 56px);
    background-color: var(--sidebar-bg);
    border-right: 1px solid #dee2e6;
}

.sidebar .nav-link {
    color: var(--dark-color);
    padding: 0.75rem 1rem;
    border-radius: 8px;
    margin: 0.25rem;
    transition: all 0.3s ease;
}

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

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

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

/* Contenido principal */
main {
    padding-top: 1rem;
}

.content-section {
    animation: fadeIn 0.3s ease-in-out;
}

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

/* Cards del dashboard */
.stat-card {
    background: white;
    border-radius: 15px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border: none;
    overflow: hidden;
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.stat-card .card-body {
    padding: 1.5rem;
}

.stat-card .stat-icon {
    width: 60px;
    height: 60px;
    border-radius: 15px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: white;
}

.stat-card .stat-number {
    font-size: 2rem;
    font-weight: bold;
    margin: 0;
}

.stat-card .stat-label {
    color: #6c757d;
    font-size: 0.9rem;
    margin: 0;
}

/* Colores para los iconos de estadísticas */
.stat-primary { background: linear-gradient(135deg, var(--primary-color), #0056b3); }
.stat-success { background: linear-gradient(135deg, var(--success-color), #146c43); }
.stat-warning { background: linear-gradient(135deg, var(--warning-color), #d39e00); }
.stat-info { background: linear-gradient(135deg, var(--info-color), #0a9ed5); }

/* Tablas */
.table {
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.table thead th {
    border: none;
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.85rem;
    letter-spacing: 0.5px;
}

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

.table tbody tr:hover {
    background-color: rgba(13, 110, 253, 0.05);
}

/* Badges */
.badge {
    font-size: 0.75rem;
    padding: 0.5rem 0.75rem;
    border-radius: 20px;
}

/* Botones */
.btn {
    border-radius: 8px;
    font-weight: 500;
    transition: all 0.3s ease;
}

.btn:hover {
    transform: translateY(-1px);
}

.btn-sm {
    padding: 0.375rem 0.75rem;
    font-size: 0.875rem;
}

/* Alertas */
.alert {
    border-radius: 10px;
    border: none;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.alert .alert-heading {
    font-weight: 600;
}

/* Modales */
.modal-content {
    border-radius: 15px;
    border: none;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
}

.modal-header {
    border-bottom: 1px solid #e9ecef;
    border-radius: 15px 15px 0 0;
}

.modal-footer {
    border-top: 1px solid #e9ecef;
    border-radius: 0 0 15px 15px;
}

/* Navbar */
.navbar-brand {
    font-weight: 600;
    font-size: 1.25rem;
}

.navbar-nav .nav-link {
    transition: color 0.3s ease;
}

/* Formularios */
.form-control, .form-select {
    border-radius: 8px;
    border: 1px solid #ced4da;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.form-control:focus, .form-select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(13, 110, 253, 0.25);
}

/* Spinners de carga */
.loading-spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid #f3f3f3;
    border-top: 3px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Responsive */
@media (max-width: 768px) {
    .welcome-section {
        padding: 2rem 1rem;
    }
    
    .features-grid .col-6 {
        margin-bottom: 1rem;
    }
    
    .login-section {
        padding: 1rem;
    }
    
    .sidebar {
        min-height: auto;
    }
    
    main {
        padding: 1rem 0.5rem;
    }
    
    .stat-card .stat-number {
        font-size: 1.5rem;
    }
}

@media (max-width: 576px) {
    .features-grid .col-6 {
        width: 100%;
    }
    
    .table-responsive {
        font-size: 0.875rem;
    }
    
    .btn-group .btn {
        padding: 0.375rem 0.5rem;
        font-size: 0.8rem;
    }
}

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

.slide-in-right {
    animation: slideInRight 0.3s ease-out;
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* Estados de carga */
.loading-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

/* Mejoras para accesibilidad */
.btn:focus,
.form-control:focus,
.form-select:focus {
    outline: none;
}

.sr-only {
    position: absolute !important;
    width: 1px !important;
    height: 1px !important;
    padding: 0 !important;
    margin: -1px !important;
    overflow: hidden !important;
    clip: rect(0, 0, 0, 0) !important;
    white-space: nowrap !important;
    border: 0 !important;
}