```css
/* =========================================
   RESET / BASE
========================================= */

* {
    box-sizing: border-box;
}

html {
    font-size: 16px;
}

body {
    margin: 0;
    font-family:
        -apple-system,
        BlinkMacSystemFont,
        "Segoe UI",
        Roboto,
        Helvetica,
        Arial,
        sans-serif;

    color: #222;
    background: #fff;
    line-height: 1.6;
}

img {
    display: block;
    max-width: 100%;
}

h1,
h2,
p {
    margin-top: 0;
}

/* =========================================
   COMING SOON PAGE
========================================= */

body.coming-soon-page {
    background: #fff;
    overflow: hidden;
}

main.coming-soon {
    width: 100vw;
    max-width: none;
    height: 100vh;

    margin: 0;
    padding: 0;

    display: flex;
    align-items: center;
    justify-content: center;
}

.coming-soon img {
    display: block;
    width: 750px;
    max-width: 80vw;
    height: auto;
}

/* =========================================
   HEADER
========================================= */

.site-header {
    width: 100%;
    background: #fff;
    border-bottom: 1px solid #deded9;
    padding: 3rem 20px;
}

.header-inner {
    width: 80%;
    max-width: 1200px;
    margin: 0 auto;

    display: grid;
    grid-template-columns: 1fr 1.4fr;
    gap: 5rem;
    align-items: center;
}


/* Logo */

.header-logo {
    width: 240px;
}

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


/* Header copy */

.header-copy {
    max-width: 650px;
}

.header-copy h1 {
    margin-bottom: 0.6rem;

    font-size: 1.35rem;
    font-weight: 600;
    line-height: 1.3;
}

.header-copy p {
    margin-bottom: 0;

    color: #555;
    font-size: 1rem;
}


/* =========================================
   MAIN
========================================= */

main {
    width: 80%;
    max-width: 1200px;
    margin: 0 auto;

    padding: 4.5rem 0 5rem;
}


/* =========================================
   INTRO
========================================= */

.intro {
    max-width: 850px;
    margin-bottom: 4rem;
}

.intro p {
    margin-bottom: 1rem;
    font-size: 1.05rem;
}

.intro p:last-child {
    margin-bottom: 0;
}


/* =========================================
   SECTION HEADINGS
========================================= */

h2 {
    margin-bottom: 1.75rem;

    font-size: 1.45rem;
    line-height: 1.3;
}


/* =========================================
   PARTICIPANT INFORMATION
========================================= */

.participant-info {
    margin-bottom: 4rem;
    padding-bottom: 3rem;

    border-bottom: 1px solid #d8d8d5;
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
}

.field {
    display: flex;
    flex-direction: column;
}

.field label {
    margin-bottom: 0.45rem;

    font-size: 0.95rem;
    font-weight: 600;
}

.field label span {
    font-weight: 400;
    color: #777;
}


/* =========================================
   FORM ELEMENTS
========================================= */

input,
textarea {
    width: 100%;

    border: 1px solid #c9c9c5;
    border-radius: 4px;

    background: #fff;
    color: #222;

    font-family: inherit;
    font-size: 1rem;

    transition: border-color 0.15s ease;
}

input {
    height: 46px;
    padding: 0 0.8rem;
}

textarea {
    min-height: 190px;
    padding: 0.9rem;

    line-height: 1.55;

    resize: vertical;
}

input:focus,
textarea:focus {
    outline: none;
    border-color: #555;
}


/* =========================================
   QUESTIONS
========================================= */

.question {
    margin-bottom: 3.5rem;
}

.question label {
    display: block;

    margin-bottom: 0.9rem;

    font-size: 1.08rem;
    font-weight: 700;
    line-height: 1.5;
}

.question-number {
    margin-right: 0.35rem;
}


/* =========================================
   CONCEPT TEST
========================================= */

.concept-section {
    margin-top: 5rem;
    padding-top: 3.5rem;

    border-top: 2px solid #222;
}

.concept-intro {
    max-width: 850px;
    margin-bottom: 3rem;
}

.concept-intro p {
    margin-bottom: 0;

    font-size: 1.05rem;
}


/* =========================================
   SUBMIT
========================================= */

.submit-area {
    margin-top: 4rem;
    padding-top: 3rem;

    border-top: 1px solid #d8d8d5;
}

button {
    display: inline-block;

    padding: 0.9rem 1.8rem;

    border: 0;
    border-radius: 4px;

    background: #222;
    color: #fff;

    font-family: inherit;
    font-size: 1rem;
    font-weight: 600;

    cursor: pointer;

    transition: background 0.15s ease;
}

button:hover {
    background: #111;
}


/* =========================================
   CALL TO ACTION
========================================= */

.cta {
    width: 100%;

    background: #e9e9e5;

    border-top: 1px solid #d6d6d2;
    border-bottom: 1px solid #d6d6d2;

    padding: 4rem 20px;
}

.cta-inner {
    width: 80%;
    max-width: 1100px;
    margin: 0 auto;

    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 4rem;

    align-items: center;
}


/* Photo */

.cta-photo {
    width: 220px;
    height: 220px;

    margin: 0 auto;

    border-radius: 50%;
    overflow: hidden;

    background: #ddd;
}

.cta-photo img {
    width: 100%;
    height: 100%;

    object-fit: cover;
}


/* CTA copy */

.cta-content {
    max-width: 650px;
}

.cta-content h2 {
    margin-bottom: 0.75rem;

    font-size: 1.8rem;
    line-height: 1.25;
}

.cta-content p {
    margin-bottom: 1.5rem;

    font-size: 1rem;
}


/* CTA button */

.cta-button {
    display: inline-block;

    padding: 0.8rem 1.5rem;

    border-radius: 4px;

    background: #222;
    color: #fff;

    text-decoration: none;

    font-weight: 600;

    transition: background 0.15s ease;
}

.cta-button:hover {
    background: #111;
}


/* =========================================
   FOOTER
========================================= */

.site-footer {
    width: 100%;

    background: #222;
    color: #aaa;

    padding: 2.5rem 20px;
}

.footer-inner {
    width: 80%;
    max-width: 1200px;
    margin: 0 auto;
}

.footer-logo {
    width: 115px;
    margin-bottom: 1rem;
}

.copyright {
    margin-bottom: 0;

    font-size: 0.8rem;
}


/* =========================================
   TABLET
========================================= */

@media (max-width: 768px) {

    .header-inner,
    main,
    .footer-inner {
        width: auto;
    }


    /* Header */

    .header-inner {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .header-logo {
        width: 200px;
    }


    /* Participant information */

    .info-grid {
        grid-template-columns: 1fr;
        gap: 1.25rem;
    }


    /* CTA */

    .cta-inner {
        width: auto;

        grid-template-columns: 1fr;
        gap: 2rem;

        text-align: center;
    }

    .cta-content {
        margin: 0 auto;
    }
}


/* =========================================
   MOBILE
========================================= */

@media (max-width: 480px) {

    /* Header */

    .site-header {
        padding: 2.25rem 20px;
    }

    .header-logo {
        width: 170px;
    }

    .header-copy h1 {
        font-size: 1.2rem;
    }


    /* Main */

    main {
        width: auto;

        padding: 2.75rem 20px 4rem;
    }

    .intro {
        margin-bottom: 3rem;
    }


    /* Questions */

    h2 {
        font-size: 1.3rem;
    }

    .question {
        margin-bottom: 3rem;
    }

    .question label {
        font-size: 1rem;
    }

    textarea {
        min-height: 200px;
    }


    /* Submit */

    button {
        width: 100%;
        min-height: 50px;
    }


    /* CTA */

    .cta {
        padding: 3rem 20px;
    }

    .cta-photo {
        width: 180px;
        height: 180px;
    }

    .cta-content h2 {
        font-size: 1.5rem;
    }

    .cta-button {
        width: 100%;
        text-align: center;
    }


    /* Footer */

    .site-footer {
        padding: 2rem 20px;
    }
}
```