body {
    font-family: "Segoe UI", Roboto, sans-serif;
    background: #f4f6f9;
    margin: 0;
    padding: 0;
}

.container {
    max-width: 700px;
    margin: 40px auto;
    padding: 20px;
}

h1 {
    text-align: center;
    font-size: 32px;
    margin-bottom: 10px;
}

.subtitle {
    text-align: center;
    color: #555;
    margin-bottom: 30px;
    line-height: 1.5;
}

.card {
    background: white;
    padding: 25px;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
}

input[type="file"] {
    width: 100%;
    margin: 15px 0;
}

button {
    width: 100%;
    padding: 12px;
    background: #0066ff;
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    cursor: pointer;
}

    button:hover {
        background: #0052cc;
    }

.status {
    margin-top: 15px;
    font-weight: bold;
}

.progress {
    display: flex;
    align-items: center;
    margin-top: 20px;
}

.spinner {
    width: 22px;
    height: 22px;
    border: 3px solid #ccc;
    border-top-color: #0066ff;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin-right: 10px;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

.hidden {
    display: none;
}

.download-btn {
    display: inline-block;
    padding: 12px 18px;
    background: #28a745;
    color: white;
    border-radius: 8px;
    text-decoration: none;
    font-weight: bold;
}

    .download-btn:hover {
        background: #218838;
    }