body {
    margin: 0;
    padding: 0;
    font-family: Arial, sans-serif;
    width: 100%;
    min-height: 100vh;
    overflow-x: hidden;
    background: #0D0625;
    text-align: center;
}

.container {
    width: 100%;
    font-size: 0;
    vertical-align: middle;
    display: inline-block;
    position: relative;
    max-width: 750px;
    display: none;
}

.container a {
    display: block;
}

#guide-img {
    display: none;
    position: absolute;
    right: 20px;
    top: 0;
    width: 80%;
    max-width: 400px;
    height: auto;
}

a img {
    -webkit-touch-callout: none;
    -webkit-user-select: none;
    user-select: none;
    -webkit-user-drag: none;
}


.main-content {
    flex: 1;
}

.content-panel {
    display: none;
    opacity: 0;
    transform: translateY(10px);
    transition: opacity 0.4s ease, transform 0.4s ease;
}

.content-panel.active {
    display: block;
    opacity: 1;
    transform: translateY(0);
}