/* Paleta de colores actualizada */
        :root {
            --azul-oscuro: #0a3a5c;
            --azul-medio: #1a6fb0;
            --azul-claro: #2a9df4;
            --turquesa-claro: #4ce8d8;
            --turquesa: #2de6d4;
            --turquesa-oscuro: #1fb8a9;
            --blanco: #ffffff;
            --gris-claro: #f0f8ff;
            --danger: #dc3545;
        }
        
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }
        
        body {
            background: linear-gradient(135deg, var(--gris-claro), #e6f7ff);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
            color: #333333;
            line-height: 1.6;
            padding-top: 100px;
        }
        
        /* BARRA DE NAVEGACIÓN - Degradado invertido */
        nav {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            background: linear-gradient(135deg, 
                var(--turquesa), 
                var(--azul-claro),
                var(--azul-medio),
                var(--azul-oscuro));
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 12px 30px;
            height: auto;
            z-index: 1000;
            flex-wrap: wrap;
            box-shadow: 0 5px 15px rgba(10, 58, 92, 0.2);
        }
        
        .logo-container {
            display: flex;
            align-items: center;
            position: relative;
            z-index: 2;
            background: rgba(255, 255, 255, 0.1);
            border-radius: 10px;
            padding: 8px 15px;
            backdrop-filter: blur(5px);
            border: 1px solid rgba(255, 255, 255, 0.15);
        }
        
        .logo-img {
            max-width: 160px;
            height: auto;
        }
        
        .nav-menus {
            display: flex;
            flex-wrap: wrap;
            gap: 15px;
        }
        
        .menu {
            position: relative;
            z-index: 2;
        }
        
        .menu a {
            color: var(--blanco);
            font-weight: 600;
            text-decoration: none;
            padding: 8px 15px;
            display: block;
            border-radius: 20px;
            transition: all 0.3s ease;
            background: rgba(255, 255, 255, 0.1);
            backdrop-filter: blur(5px);
            border: 1px solid rgba(255, 255, 255, 0.15);
            font-size: 0.95rem;
            text-align: center;
        }
        
        .menu a:hover {
            background: rgba(255, 255, 255, 0.3);
            transform: translateY(-2px);
        }
        
        .login-container {
            background: linear-gradient(135deg, var(--blanco), #f0faff);
            border-radius: 12px;
            box-shadow: 0 8px 20px rgba(10, 58, 92, 0.08);
            width: 100%;
            max-width: 400px;
            overflow: hidden;
            margin: auto;
            border: 1px solid rgba(45, 230, 212, 0.2);
            position: relative;
            overflow: hidden;
        }
        
        .login-header {
            background: linear-gradient(135deg, var(--azul-oscuro), var(--azul-medio));
            color: var(--blanco);
            text-align: center;
            padding: 25px 20px;
            position: relative;
        }
        
        .login-header::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 4px;
            background: linear-gradient(90deg, var(--turquesa), var(--azul-claro));
        }
        
        .login-header h1 {
            font-size: 1.8rem;
            margin-bottom: 5px;
        }
        
        .login-header img {
            width: 100px;
            margin-bottom: 15px;
        }
        
        .login-form {
            padding: 25px;
        }
        
        .form-group {
            margin-bottom: 20px;
        }
        
        .form-group label {
            display: block;
            margin-bottom: 8px;
            color: var(--azul-medio);
            font-weight: 600;
        }
        
        .form-control {
            width: 100%;
            padding: 12px 15px;
            border: 1px solid #ddd;
            border-radius: 8px;
            font-size: 1rem;
            transition: all 0.3s;
            background: rgba(255, 255, 255, 0.9);
        }
        
        .form-control:focus {
            border-color: var(--turquesa);
            outline: none;
            box-shadow: 0 0 0 3px rgba(45, 230, 212, 0.2);
        }
        
        .btn {
            width: 100%;
            padding: 12px;
            background: linear-gradient(135deg, var(--turquesa-claro), var(--turquesa));
            color: var(--azul-oscuro);
            border: none;
            border-radius: 25px;
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s;
            text-align: center;
            display: block;
            text-decoration: none;
            box-shadow: 0 4px 12px rgba(45, 230, 212, 0.4);
            border: 1px solid rgba(255, 255, 255, 0.5);
        }
        
        .btn:hover {
            background: linear-gradient(135deg, var(--turquesa), #1a9c8f);
            transform: translateY(-3px) scale(1.05);
            box-shadow: 0 8px 20px rgba(45, 230, 212, 0.6);
        }
        
        .btn-register {
            margin-top: 10px;
            background: linear-gradient(135deg, #4CAF50, #45a049);
            color: var(--blanco);
        }
        
        .btn-register:hover {
            background: linear-gradient(135deg, #45a049, #3d8e41);
        }
        
        .error-message {
            color: var(--danger);
            background-color: #f8d7da;
            border: 1px solid #f5c6cb;
            padding: 10px;
            border-radius: 8px;
            margin-bottom: 20px;
            text-align: center;
            display: <?php echo isset($error) ? 'block' : 'none'; ?>;
        }
        
        .login-footer {
            text-align: center;
            padding: 15px;
            background-color: var(--gris-claro);
            border-top: 1px solid rgba(45, 230, 212, 0.2);
            color: var(--azul-medio);
            font-size: 0.9rem;
        }
        
        .login-footer a {
            color: var(--azul-oscuro);
            text-decoration: none;
            font-weight: 600;
        }
        
        .login-footer a:hover {
            color: var(--turquesa-oscuro);
            text-decoration: underline;
        }
        
        /* Footer simple */
        footer {
            background: linear-gradient(135deg, var(--azul-oscuro), var(--azul-medio));
            color: var(--blanco);
            text-align: center;
            padding: 35px 10px;
            position: relative;
            width: 100%;
            overflow: hidden;
            margin-top: auto;
        }
        
        footer::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 4px;
            background: linear-gradient(90deg, var(--turquesa), var(--azul-claro));
        }
        
        .footer-content {
            max-width: 1200px;
            margin: 0 auto;
        }
        
        .footer-content p {
            margin-bottom: 10px;
        }
        
        @media (max-width: 600px) {
            body {
                padding-top: 150px;
            }
            
            nav {
                padding: 10px 15px;
                flex-direction: column;
                align-items: center;
                gap: 10px;
            }
            
            .logo-container {
                margin: 0 auto;
            }
            
            .logo-img {
                max-width: 130px;
            }
            
            .nav-menus {
                width: 100%;
                justify-content: center;
            }
            
            .login-container {
                border-radius: 0;
                margin: 10px;
            }
        }