body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    background-color: #f0f0f0;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 20px;
    flex-grow: 1;
}

header {
    background-color: #000;
    color: #fff;
    text-align: center;
    padding: 20px 0;
}

.logo {
    max-width: 100px;
    margin-bottom: 10px;
}

h1 {
    margin: 0;
    font-size: 24px;
}

h2 {
    margin-top: 0;
}

form {
    background-color: #fff;
    padding: 20px;
    border-radius: 5px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    margin-top: 20px;
}

input[type="file"] {
    margin-bottom: 10px;
}

button {
    background-color: #000;
    color: #fff;
    border: none;
    padding: 10px 20px;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s;
}

button:hover {
    background-color: #333;
}

.message {
    margin-top: 20px;
    padding: 10px;
    border-radius: 5px;
}

.success {
    background-color: #d4edda;
    color: #155724;
}

.error {
    background-color: #f8d7da;
    color: #721c24;
}

.error-page {
    text-align: center;
    padding: 50px 0;
}

.error-page h1 {
    font-size: 72px;
    margin-bottom: 20px;
}

/* New styles for dialog, loader, and download button */
.dialog {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.4);
}

.dialog-content {
    background-color: #fefefe;
    margin: 15% auto;
    padding: 20px;
    border: 1px solid #888;
    width: 80%;
    max-width: 500px;
    text-align: center;
    border-radius: 5px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.loader {
    border: 5px solid #f3f3f3;
    border-top: 5px solid #000;
    border-radius: 50%;
    width: 50px;
    height: 50px;
    animation: spin 1s linear infinite;
    margin: 20px auto;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

#download-btn {
    display: none;
    margin-top: 20px;
    background-color: #4CAF50;
}

#download-btn:hover {
    background-color: #45a049;
}