/* Reset & Base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    background: hsl(227, 10%, 10%);
    color: #fff;
    font-family: 'Fira Sans', sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
    min-height: 100vh;
    padding: 20px;
}

.container {
    max-width: 500px;
}

/* Headings */
h1 {
    margin-bottom: 15px;
    font-weight: 400;
}

p {
    margin-bottom: 20px;
    font-size: 1.1rem;
}

/* Input Field */
.input-field {
    width: 100%;
    padding: 1em;
    margin-bottom: 15px;
    border: 2px solid #8fc866;
    border-radius: 5px;
    background: none;
    color: #fff;
    font-size: 1rem;
}

/* Button Style */
.btn {
    background: none;
    border: 2px solid;
    font: inherit;
    padding: 1em 3em;
    cursor: pointer;
    transition: 0.25s;
    color: var(--color);
}

/* Fill Button */
.fill { 
    --color: #19bc8b; 
    --hover: #19bcda; 
}

.btn:hover {
    color: #fff;
    border-color: var(--hover);
}

.fill:hover {
    box-shadow: inset 0 0 0 2em var(--hover);
}

/* Alert Message */
.alert {
    margin-top: 20px;
    padding: 15px;
    background-color: #ff4d4f;
    border-radius: 5px;
    color: #fff;
}

/* Footer */
footer {
    margin-top: 30px;
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.6);
}

footer a {
    color: #e4cb58;
    text-decoration: none;
}