html {
    width: 100%;
    height: 100%;
    margin: 0;
}

body {
    min-width: 1000px;
    font-family: 'Helvetica Neue', Arial, Helvetica, sans-serif;
    background-image: linear-gradient(to bottom, #0f2027, #203a43, #2c5364, #203a43, #0f2027);
    background-repeat: no-repeat;
    background-size: 100% 200%;
    background-attachment: fixed;
    color: #fff;
    animation: gradient 15s ease infinite;
}

@keyframes
 gradient {
    0% { background-position: 0% 0%; }
    50% { background-position: 0% 100%; }
    100% { background-position: 0% 0%; }
}

.logo {
    background-color: rgba(0, 0, 0, 0.5);
    color: #fff;
    padding: 30px;
    width: 75%;
    margin: clamp(24px, 6vh, 64px) auto 0 auto;
    text-align: center;
    border-radius: 15px;
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.3);
}

.logoimg {
    width: 300px;
    height: auto;
    filter: drop-shadow(0 4px 8px rgba(0, 0, 0, 0.2));
}

.mainbox {
    background-color: #000;
    color: #fff;
    padding: 40px;
    width: 75%;
    margin: 20px auto clamp(24px, 6vh, 64px) auto;
    border-radius: 20px;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.4);
}

h1 {
    text-align: center;
    font-size: 2.5em;
    margin-bottom: 30px;
    color: #fff;
}

.contentleft {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 40px;
}

.textleft {
    flex: 1;
    margin: 0;
    line-height: 1.6;
    font-size: 1.2em;
    text-align: center;
    max-width: 80%;
}

iframe {
    width: 560px;
    height: 315px;
    border-radius: 15px;
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.3);
    border: none;
}

hr {
    border: none;
    height: 2px;
    background-color: #00a8e8;
    margin: 40px auto;
    width: 50%;
}