/* CSS Document */
:root {
            --primary-color: #2c3e50;
            --secondary-color: #1b344c;
            --light-color: #f8f9fa;
            --dark-color: #212529;
            --input-bg-light: #ffffff;
            --input-text-light: #495057;
            --input-placeholder-light: #6c757d;
            --input-border-light: #ced4da;
            --input-bg-dark: #2d2d2d;
            --input-text-dark: #e0e0e0;
            --input-placeholder-dark: #aaaaaa;
            --input-border-dark: #444444;
            --icon-color-light: #495057;
            --icon-color-dark: #aaaaaa;
        }
        
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background-color: #f5f7fa;
            color: var(--dark-color);
            height: 100vh;
            display: flex;
            justify-content: center;
            align-items: center;
            margin: 0;
            transition: all 0.3s ease;
        }
        
        .login-container {
            width: 100%;
            max-width: 400px;
            padding: 2rem;
            background: white;
            border-radius: 10px;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
            transition: all 0.3s ease;
        }
        
        .login-brand {
            text-align: center;
            margin-bottom: 2rem;
            color: var(--primary-color);
        }
        
        .login-brand i {
            font-size: 2.5rem;
            margin-bottom: 1rem;
        }
        
        .login-brand h1 {
            font-size: 1.8rem;
            font-weight: 600;
            margin: 0;
        }
        
        .form-control {
            padding: 0.75rem 1rem;
            border-radius: 8px;
            border: 1px solid var(--input-border-light);
            
            background-color: var(--input-bg-light);
            color: var(--input-text-light);
            transition: all 0.3s ease;
        }
        
        .form-control::placeholder {
            color: var(--input-placeholder-light);
            opacity: 1;
        }
        
        .form-control:focus {
            border-color: var(--primary-color);
            box-shadow: 0 0 0 0.25rem rgba(67, 97, 238, 0.25);
        }
        
        .input-group-text {
            background-color: transparent;
            border-right: none;
            color: var(--icon-color-light);
            transition: all 0.3s ease;
        }
        
        .input-group .form-control {
            border-left: none;
        }
        
        .btn-login {
            width: 100%;
            padding: 0.75rem;
            border-radius: 8px;
            background-color: var(--primary-color);
            border: none;
            color: white;
            font-weight: 600;
            transition: all 0.3s ease;
        }
        
        .btn-login:hover {
            background-color: var(--secondary-color);
            transform: translateY(-2px);
        }
        
        .login-footer {
            text-align: center;
            margin-top: 1.5rem;
            color: #6c757d;
            transition: all 0.3s ease;
        }
        
        .login-footer a {
            color: var(--primary-color);
            text-decoration: none;
        }
        
        /* Dark mode styles */
        body.dark-mode {
            background-color: #121212;
            color: #e0e0e0;
        }
        
        body.dark-mode .login-container {
            background-color: #1e1e1e;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
        }
        
        body.dark-mode .form-control {
            background-color: var(--input-bg-dark);
            border-color: var(--input-border-dark);
            color: var(--input-text-dark);
        }
        
        body.dark-mode .form-control::placeholder {
            color: var(--input-placeholder-dark);
        }
        
        body.dark-mode .input-group-text {
            background-color: #333;
            border-color: var(--input-border-dark);
            color: var(--icon-color-dark);
        }
        
        body.dark-mode .login-footer {
            color: #aaa;
        }
        
        /* Animación para el toggle del tema */
        @keyframes spin {
            0% { transform: rotate(0deg); }
            100% { transform: rotate(360deg); }
        }
        
        .theme-toggle-animation {
            animation: spin 0.5s ease;
        }