body {
    font-family: sans-serif;
    background-color: #f2f2f2;
    margin: 0;
    padding: 20px;
}

h1 {
    text-align: center;
}

details {
    background: #fff;
    border-radius: 12px;
    padding: 10px 20px;
    margin-bottom: 20px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
}

summary {
    font-size: 1.3rem;
    font-weight: bold;
    cursor: pointer;
    outline: none;
    list-style: none;
}

summary::marker {
    display: none;
}

summary::before {
    content: "▶ ";
    font-size: 1rem;
}

details[open] summary::before {
    content: "▼ ";
}

.project-desc {
    margin: 10px 0;
}

.project-link {
    display: inline-block;
    margin-bottom: 16px;
    color: #007acc;
    text-decoration: none;
    font-weight: bold;
}

.project-media {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
}

.project-media img,
.project-media video,
.project-media iframe {
    width: 100%;
    max-width: 600px;
    border-radius: 8px;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.15);
}

.container {
    max-width: 900px;
    margin: 0 auto 40px auto;
    padding: 0 20px;
}