:root {
    --color-text: #333;
    --color-white: #ffffff;
    --color-black: #000000;
    --color-light-gray: #ccc;
    --color-gray: #ddd;
    --color-dark-gray: #444;
    --text-shadow-dark: 1px 1px 3px rgba(0, 0, 0, 0.6);
    --box-shadow-main: 0 4px 16px 0 rgba(0, 0, 0, 0.1);
    --box-shadow-strong: -10px -10px 0px rgba(0, 0, 0, 1);
    --gradient-main: linear-gradient(rgba(0, 0, 0, 0), rgba(0, 0, 0, 0.6));
    --gradient-mobile: linear-gradient(rgba(0, 0, 0, 0.2), rgba(0, 0, 0, 0.6));
}

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

body {
    font-family: 'Open Sans', sans-serif;
    color: var(--color-text);
    line-height: 1.6;
}

button {
    transition: background 0.3s ease;
}

.promotion-intro {
    background: var(--gradient-main), url(../images/stadium-bgn.png);
    background-repeat: no-repeat;
    background-position: center;
    height: 821px;
    text-align: center;
    color: var(--color-white);
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 40px 20px;
}

.promotion-intro .promotion-banner {
    width: 150px;
    height: 150px;
}

.promotion-intro .brand-logo {
    border-radius: 50%;
    width: 100%;
    height: 100%;
}

.promotion-intro .promotion-summary {
    margin-top: 20px;
    width: 60%;
}

.promotion-intro .promotion-summary h1 {
    margin-bottom: 5px;
    text-shadow: var(--text-shadow-dark);
}

.promotion-intro .promotion-summary h2 {
    margin-bottom: 25px;
}

.promotion-intro .promotion-summary p {
    font-size: 1rem;
    margin-bottom: 20px;
    text-shadow: var(--text-shadow-dark);
}

.promotion-intro .promotion-summary .start-button {
    display: inline-block;
    background: var(--color-white);
    color: var(--color-black);
    padding: 12px 24px;
    text-decoration: none;
    border-radius: 4px;
    font-weight: 600;
}

.promotion-intro .promotion-summary .start-button:hover {
    background: var(--color-gray);
}

.promotion-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 20px;
}

.promotion-content .section {
    background: var(--color-white);
    padding: 40px 20px;
    border-radius: 8px;
    max-width: 800px;
    box-shadow: var(--box-shadow-main), var(--box-shadow-main);
}

.promotion-content .section.form-section {
    margin-top: -120px;
    margin-bottom: 20px;
    width: 100%;
}

.promotion-content .section.form-section p {
    margin-bottom: 20px;
}

.promotion-content .section.form-section form {
    width: 60%;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
}

.promotion-content .section.form-section form h2 {
    margin-bottom: 10px;
}

.promotion-content .section.form-section form input[type="text"] {
    padding: 10px;
    font-size: 1rem;
    border: 1px solid var(--color-light-gray);
    border-radius: 4px;
    margin-bottom: 20px;
}

.promotion-content .section.form-section form button {
    cursor: pointer;
    width: fit-content;
    margin: 0 auto;
    display: inline-block;
    background: var(--color-black);
    color: var(--color-white);
    padding: 12px 24px;
    text-decoration: none;
    border-radius: 4px;
    font-weight: 600;
}

.promotion-content .section.form-section form button:hover {
    background: var(--color-dark-gray);
}

.promotion-content .section.info-section {
    color: var(--color-black);
}

.promotion-content .section.info-section h2 {
    text-align: center;
    margin-bottom: 30px;
}

.promotion-content .section.info-section .info-item {
    padding-bottom: 20px;
}

.promotion-content .section.info-section .info-item .info-item-top {
    display: flex;
    align-items: center;
    border-bottom: 1px solid var(--color-gray);
    cursor: pointer;
    padding-bottom: 5px;
    margin-bottom: 15px;
    position: relative;
}

.promotion-content .section.info-section .info-item .info-item-header {
    font-weight: 600;
    flex: 1;
    position: relative;
}

.promotion-content .section.info-section .info-item .info-item-header::after {
    content: "+";
    font-weight: bold;
    font-size: 1.2rem;
    position: absolute;
    right: 10px;
    top: 50%;
    transform: translateY(-50%);
}

.promotion-content .section.info-section .info-item .info-item-bottom {
    height: 0;
    overflow: hidden;
    transition: height 0.3s ease;
}

.promotion-content .section.info-section .info-item.open .info-item-header::after {
    content: "-";
}

.promotion-content .section.support {
    font-style: italic;
    background: var(--color-white);
    padding: 40px 20px;
    margin: -25px auto 0;
    position: relative;
    z-index: 3;
    border-radius: 8px;
    max-width: 275px;
    border: 4px solid var(--color-black);
    box-shadow: var(--box-shadow-strong);
    transform: skewX(-5deg);
}

.promotion-content .section.support a {
    color: var(--color-black);
    text-decoration: underline;
}

.promotion-content .section.support a:hover {
    text-decoration: none;
}

@media (max-width: 768px) {

    .promotion-intro {
        background: var(--gradient-mobile), url(../images/stadium-bgn.png);
        background-repeat: no-repeat;
        background-position: top;
        background-size: cover;
        min-height: 100vh;
    }

    .promotion-intro .promotion-summary {
        margin: 0 auto;
        margin-top: 20px;
        height: 100%;
        width: 100%;
        display: flex;
        flex-direction: column;
        align-items: center;
    }

    .promotion-intro .promotion-summary .start-button {
        max-width: fit-content;
        margin-top: auto;
    }

    .promotion-content {
        height: 100vh;
        justify-content: center;
    }

    .promotion-content .section.form-section form {
        width: 100%;
    }

    .promotion-content .section.form-section {
        margin-top: 0px;
    }
}