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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Open Sans", "Helvetica Neue", sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f4f4f4;
    padding-top: 60px;
}

header {
    background: #333;
    color: #fff;
    padding: 1rem 0;
    text-align: center;
    position: fixed;
    width: 100%;
    top: 0;
    left: 0;
    z-index: 10;
}

header h1 {
    margin: 0;
    font-size: 2em;
}

main {
    max-width: 800px;
    margin: 20px auto;
    padding: 0 20px;
}

section {
    background: #fff;
    padding: 20px;
    margin-bottom: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

h2,
h3 {
    color: #333;
    margin-bottom: 15px;
    border-bottom: 2px solid #eee;
    padding-bottom: 5px;
}

.app-item {
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 1px dashed #ccc;
}

.app-item:last-child {
    border-bottom: none;
}

.app-item img {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 0 auto 15px auto;
    border: 1px solid #000000;
    border-radius: 4px;
}

.app-item p {
    text-align: justify;
    margin-top: 10px;
}

.video-wrapper {
    position: relative;
    width: 100%;
    padding-bottom: 56.25%;
    height: 0;
    margin-bottom: 15px;
}

.video-wrapper iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: 0;
}

.tag {
    display: inline-block;
    background-color: #e0e0e0;
    color: #333;
    padding: 4px 10px;
    border-radius: 15px;
    font-size: 0.8em;
    margin-right: 5px;
    margin-bottom: 5px;
}

.asset-list {
    margin-left: 20px;
}

footer {
    text-align: center;
    padding: 20px 0;
    margin-top: 40px;
    color: #777;
    font-size: 0.9em;
}