body {
    font-family: Arial, sans-serif;
    max-width: 800px;
    margin: 50px auto;
    padding: 20px;
}
h1 { color: #333; }
.section {
    background: #f5f5f5;
    padding: 20px;
    margin: 20px 0;
    border-radius: 8px;
}
input[type="file"], input[type="text"] {
    margin: 10px 0;
    padding: 8px;
    width: 100%;
    max-width: 400px;
}
button {
    background: #007bff;
    color: white;
    padding: 10px 20px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    margin: 5px;
}
button:hover {
    background: #0056b3;
}
.file-list {
    list-style: none;
    padding: 0;
}
.file-item {
    background: white;
    padding: 10px;
    margin: 5px 0;
    border-radius: 4px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.message {
    padding: 10px;
    margin: 10px 0;
    border-radius: 4px;
}
.success { background: #d4edda; color: #155724; }
.error { background: #f8d7da; color: #721c24; }
.info { background: #d1ecf1; color: #0c5460; }
.hidden { display: none; }
.api-key-display {
    background: white;
    padding: 10px;
    border-radius: 4px;
    font-family: monospace;
    word-break: break-all;
}
.file-date {
    font-size: 0.85em;
    color: #676;
}