body {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
    font-family: system-ui, -apple-system, sans-serif;
    line-height: 1.6;
}

nav {
    margin-bottom: 2em;
}

img {
    max-width: 100%;
    height: auto;
    cursor: pointer;
}

.lightbox {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.9);
    z-index: 1000;
}

.lightbox img {
    max-height: 93vh;
    max-width: 93vw;
    margin: auto;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    cursor: pointer;
}

.close {
    position: absolute;
    top: 15px;
    right: 35px;
    color: #f1f1f1;
    font-size: 40px;
    font-weight: bold;
    cursor: pointer;
}

.post img {
    background: #f0f0f0;
    min-height: 200px;
    opacity: 1;
    transition: background-color 0.3s;
}

.post img[src] {
    min-height: auto;
    background: none;
}