* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    background-image: linear-gradient(to top left, #fff, #1744DA);
    font-family: sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh; 
}

.container {
    background: #fff; 
    width: 100%;
    max-width: 400px;
    padding: 2em;
    border-radius: 10px;
    box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2), 0 6px 20px 0 rgba(0, 0, 0, 0.19);;
}

.login-form h2 {
    text-align: center;
    color: #1744DA;
    font-size: 1.5em;
    margin-bottom: 15px;
}

.input-group {
    position: relative;
    margin-bottom: 1.5rem;
}

.input-group input {
    width: 100%;
    padding: 15px;
    border-radius: 5px;
    border: solid 1px #ddd;
    cursor: pointer;
    outline: none;
}

.input-group label {
    background-color: #fff;
    color: #999;
    position: absolute;
    top: 50%;
    left: 10px;
    padding: 0 5px;
    transform: translateY(-50%);
    transition: all 0.3s ease;
}

.input-group input:focus + label,
.input-group input:valid + label {
    top: 0;
    font-size: 12px;
    color: #667eea;
}

.button {
    display: flex;
    justify-content: center;
}

#login-btn{
    width: 100%;
    padding: 1em;
    border-radius: 5px; 
    transition: all 0.5s ease;
    cursor: pointer;
    border: none;
}

.button #login-btn {
    color: #fff;
    background: rgb(23, 68, 218);
}

#login-btn:hover {
    transform: translateY(-2px);
    background: rgb(3, 44, 179);
}

/* Responsividade */

/* Mobile (até 480px) */
@media only screen and (max-width: 480px) {
    .container {
        width: 90%;
        padding: 1.5em;
    }

    .login-form h2 {
        font-size: 1.2em;
    }

    .input-group input {
        padding: 12px;
        font-size: 14px;
    }

    #login-btn {
        padding: 0.8em;
        font-size: 14px;
    }
}

/* Tablet (481px até 768px) */
@media only screen and (max-width: 768px) and (min-width: 481px) {
    .container {
        width: 80%;
        padding: 2em;
    }

    .login-form h2 {
        font-size: 1.4em;
    }

    .input-group input {
        padding: 14px;
        font-size: 15px;
    }

    #login-btn {
        padding: 0.9em;
        font-size: 15px;
    }
}