@import url('https://fonts.googleapis.com/css2?family=Montserrat:wght@300;600&display=swap');

:root {
    --main-bg-color: #ECF8FB;
    --secondary-bg-color: #EFEFEF;
    --main-font-color: #747375;
    --secondary-font-color: #FFFFFF;
    --accent-color: #A0BC57;
    --button-color: #F6931D;
    --main-color: #545253;
    --secondary-color: #FFFFFF;
    --link-color: #6EB7C2;
    --input-border-color: #d8d8d8;

    --bold: 600;
    --normal: 300;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    color: var(--main-font-color);
    font-family: 'Montserrat', sans-serif;
}

.main-header {
    background-color: var(--main-color);
    height: 80px;
    display: flex;
    align-items: center;
}

.header-logo {
    margin: auto;
}

.survey-form {

    background-color: var(--secondary-color);
    margin: 0 15px;
    padding: 20px 45px;
    display: flex;
    align-items: center;
    flex-direction: column;

}

.form-header {
    background-color: var(--main-color);
    height: 80px;
    padding: 6px;
    margin: 33px 15px 0;
}

.form-header p {
    max-width: 400px;
    text-align: center;
    margin: auto;

    font-size: 18px;
    font-weight: var(--bold);
    color: var(--secondary-font-color);
    line-height: 34px;
}

.form-submit-button {
    width: 100%;
    height: 48px;
    background: #f6931d;
    border-radius: 21px;
    color: var(--secondary-font-color);
    text-transform: uppercase;
    border: none;
    margin: 10px;
    cursor: pointer;
}

.form-submit-button:disabled {
    background-color: #747375;
}

.form-input-field {
    width: 100%;
    padding: 20px;
    margin: 10px;
    box-shadow: inset 0px 1px 2px rgba(0, 0, 0, 0.5);
    height: 50px;
    border: 1px solid var(--input-border-color);
    background: var(--secondary-color);
    background-blend-mode: normal;
    border-radius: 4px;
}

.form-group {
    display: flex;
    width: 100%;
}

.form-group input {
    margin: 10px 0;
}

.form-group input:first-child {
    margin-right: 20px;
}

.form-group input:last-child {
    width: 50%;
}

.form-input-field::placeholder {
    font-weight: var(--normal);
    font-size: 16px;
    line-height: 30px;
}

.ad-wrapper {

    margin: 30px 15px;
    border: 2px solid var(--accent-color);
}

legend {
    width: auto;
    margin: auto;
    text-transform: uppercase;
    font-weight: var(--bold);
    border-left: 15px solid transparent;
    border-right: 15px solid transparent;
}

.advertising {
    background-color: var(--secondary-color);
    margin: 30px;
    padding: 15px 20px 20px 20px;
}

.ad-heading {
    color: var(--accent-color);
    text-transform: uppercase;
    font-weight: var(--bold);
    font-size: 12px;
}

.ad-subheading {
    margin-bottom: 15px;
    font-weight: var(--normal);
    font-size: 20px;
}

.ad-content {
    font-size: 14px;
}

.ad-link {
    text-transform: capitalize;
    text-decoration: none;
    color: var(--link-color);
    font-weight: var(--bold);

}

/* Dekstop */
@media only screen and (min-width: 767px) {

    .survey-form {
        max-width: 620px;
        margin: 0 auto;
    }

    .form-header {
        max-width: 620px;
        margin: 33px auto 0;
    }

    .form-submit-button {
        width: 333.61px;
    }

    .ad-wrapper {
        max-width: 404px;
        margin: 30px auto;
    }

    legend {
        border-left: 53px solid transparent;
        border-right: 53px solid transparent;
    }

    .ad-heading {
        margin-bottom: 15px;
    }

}

/* Color transition  */
.color-transition {
    width: 100%;
    animation: backgroundTransition 10s infinite;
    background-color: var(--main-bg-color);
}

@keyframes backgroundTransition {
    0% {
        background-color: var(--main-bg-color);
    }

    50% {
        background-color: var(--secondary-bg-color);
    }

    100% {
        background-color: var(--main-bg-color);
    }
}

/* Retina Optimization */

@media only screen and (-webkit-min-device-pixel-ratio: 2),
only screen and (min--moz-device-pixel-ratio: 2),
only screen and (-o-min-device-pixel-ratio: 2/1),
only screen and (min-device-pixel-ratio: 2),
only screen and (min-resolution: 192dpi),
only screen and (min-resolution: 2dppx) {

    .header-logo img {
        width: 100px;
        height: 100px;
    }
}