body {
    font-family: Arial, sans-serif;
    background: #f9f9f9;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

header {
    background: #ffffff;
    padding: 1em;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.date-wrapper {
    display: flex;
    align-items: center;
    gap: 0.5em;
}

header input[type="date"] {
    font-size: 1.2em;
    padding: 0.4em 0.6em;
    border: 1px solid #000;
    border-radius: 5px;
    background-color: #ffffff;
    color: #000;
}

#gallery {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1em;
    padding: 1em;
}

#gallery img {
    width: 100%;
    height: auto;
    cursor: pointer;
    border: 1px solid #ccc;
    border-radius: 4px;
}

footer {
    display: flex;
    justify-content: center;
    gap: 1.5em;
    padding: 1.5em;
    background: #ffffff;
}

button {
    padding: 0.8em 2em;
    font-size: 1.2em;
    font-weight: bold;
    cursor: pointer;
    border-radius: 6px;
    border: 1px solid #000;
    background-color: #ffffff;
    color: #000;
}

#overlay .popup {
    background: #fff;
    padding: 1em;
    border-radius: 8px;
    max-width: 90%;
    max-height: 90%;
    overflow: auto;
    position: relative;
}

#overlay .popup img {
    margin: 0;
}

#overlay .close-btn {
    position: absolute;
    top: -0.5em;
    right: -1em;
    background: transparent;
    color: black;
    font-size: 24px;
    font-weight: bold;
    border: none;
    cursor: pointer;
    z-index: 1001;
}

#no-images-message {
    text-align: center;
    font-size: 1.2em;
    margin-top: 2em;
    color: #555;
}