/* Reset Margin dan Padding */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* Latar Belakang Berwarna-Warni Bergerak */
body {
    font-family: Arial, sans-serif;
    color: #fff;
    background: linear-gradient(-45deg, #ff5733, #33ff57, #3357ff, #ff33a1, #f1c40f);
    background-size: 400% 400%;
    animation: gradientBackground 15s ease infinite;
    min-height: 100vh;
    position: relative;
    padding: 20px;
}

/* Animasi Background */
@keyframes gradientBackground {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

/* Kontainer Utama */
.container {
    max-width: 900px;
    margin: 50px auto;
    padding: 20px;
    background: rgba(0, 0, 0, 0.6);
    border-radius: 10px;
    box-shadow: 0 0 15px rgba(0, 0, 0, 0.5);
    position: relative;
    z-index: 1;
}

/* Header */
header {
    text-align: center;
    margin-bottom: 30px;
}

header h1 {
    font-size: 3em;
    margin-bottom: 10px;
}

header hr {
    border: 0;
    height: 2px;
    background: #fff;
    margin: 20px auto;
    width: 50%;
}

/* Navigasi */
nav {
    text-align: center;
    margin-bottom: 30px;
}

nav a {
    color: #ffd700;
    text-decoration: none;
    margin: 0 15px;
    font-size: 1.2em;
    padding: 10px 20px;
    border: 2px solid #ffd700;
    border-radius: 5px;
    transition: background-color 0.3s, color 0.3s;
}

nav a:hover {
    background-color: #ffd700;
    color: #000;
}

/* Judul Aktivitas */
.content h2 {
    color: #fff;
    margin-bottom: 15px;
    text-align: center;
}

.content p {
    font-size: 1.1em;
    line-height: 1.6;
    margin-bottom: 20px;
    text-align: center;
}

/* Styling untuk Tag Mark */
mark {
    background-color: rgba(255, 255, 0, 0.3);
    padding: 0.2em 0.4em;
    border-radius: 4px;
}

/* Styling untuk Video */
video {
    display: block;
    margin: 20px auto;
    width: 300px; /* Atur lebar video sesuai kebutuhan */
    max-width: 100%;
    height: auto;
    border: 2px solid #fff;
    border-radius: 10px;
}

/* Footer */
footer {
    text-align: center;
    padding: 15px 0;
    border-top: 1px solid #fff;
    font-size: 0.9em;
}

/* Responsif */
@media (max-width: 768px) {
    header h1 {
        font-size: 2.5em;
    }

    nav a {
        display: block;
        margin: 10px auto;
        width: 60%;
        text-align: center;
    }

    .container {
        margin: 20px;
        padding: 15px;
    }

    .content h2 {
        font-size: 1.5em;
    }

    video {
        width: 100%;
    }
}