:root {
    --color-body-bg: rgb(236, 238, 241); 
    --color-form-bg: rgb(255, 255, 255);
    --color-form-border: rgba(20, 25, 32, .12);
    --color-form-link: #1268EC;
    --color-form-text: rgba(0, 0, 0, .87);
    --color-footer-link: rgba(0, 0, 0, .87);
    --color-button-bg: #1268EC;
    --color-button-border: #1268EC;
    --color-button-hover-bg: #1F47CD;
    --color-button-text: #fff;
    --color-error-text: #D94453;
    --color-input-border: #d3d3d3;
    --color-spinner-border: rgba(255, 255, 255, .2);
    --color-spinner-top-border: #ffffff;
}


/* body */
body {
    background-color: var(--color-body-bg);
    font-family: Inter, sans-serif;
    display: grid;
    grid-template-columns: 1fr;
    grid-template-rows: 1fr min-content;
    height: 100vh;
}


/* wrapper */
.wrapper {
    display: grid;
}


/* main container */
.container {
    background-color: var(--color-form-bg);
    border: 1px solid var(--color-form-border);
    border-radius: 8px;
    color: var(--color-form-text);
    display: grid;
    gap: 28px;
    align-self: center;
    justify-self: center;
    padding: 72px 72px 48px 72px;
    width: 500px;
}
    .container header,
    .container footer {
        text-align: center;
    }
        .container header img {
            display: inline;
            height: 44px;
            margin-bottom: 12px;
            user-select: none;
        }
        .container header h2 {
            font-size: 18px;
            font-weight: normal;
        }
        .container footer a {
            color: var(--color-form-link);
            font-size: 14px;
            text-decoration: none;
        }

@media screen and (max-width: 768px) {
    .container {
        padding: 48px;
        width: 420px;
    }
}

@media screen and (max-width: 480px) {
    .container {
        padding: 48px;
        width: 380px;
    }
}



/* form */
form {
    display: grid;
    grid-gap: 20px;
}


/* label and input */
label {
    display: block;
    font-weight: bold;
    margin-bottom: 4px;
}
input {
    border: 1px solid var(--color-input-border);
    border-radius: 4px;
    display: block;
    padding: 8px;
    width: 100%;
}


/* button */
button {
    background: var(--color-button-bg);
    border: 1px solid var(--color-button-border);
    border-radius: 4px;
    color: var(--color-button-text);
    cursor: pointer;
    display: inline;
    padding: 8px;
    transition: background-color 0.3s;
}
    button:hover {
        background: var(--color-button-hover-bg);
    }
    button:disabled {
        opacity: 0.4;
    }


/* button working message */
#working-message {
    display: none;
}


/* spinner icon */
.spinner {
    animation: spin 1s linear infinite;
    border: 2px solid var(--color-spinner-border);
    border-top-color: var(--color-spinner-top-border);
    border-radius: 50%;
    display: inline-block;
    height: 14px;
    width: 14px;
    margin-left: 8px;
}
@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}


/* general error message */
#error-message {
    color: var(--color-error-text);
    display: none;
    font-size: 14px;
    text-align: center;
}


/* main footer */
.footer {
    font-size: 14px;
    padding: 24px;
    text-align: center;
}
    .footer-links {
        display: inline-flex;
        flex-wrap: wrap;
        gap: 16px;
    }
        .footer-links a {
            color: var(--color-footer-link);
            text-decoration: none;
        }
        .footer-links a:hover {
            text-decoration: underline;
        }