body {
    font-family: Arial, sans-serif;
    background: #f5f6fa;
    margin: 0;
    padding: 40px;
}

.container {
    max-width: 600px;
    margin: auto;
    background: #ffffff;
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.08);
}

h1 {
    text-align: center;
    margin-bottom: 10px;
    color: #2b3640;
}

.subtitle {
    text-align: center;
    color: #6b6f76;
    font-size: 15px;
    margin-bottom: 25px;
}

#drop-area {
    border: 2px dashed #bd9b53;
    background: #fffdee;
    padding: 40px;
    text-align: center;
    border-radius: 10px;
    cursor: pointer;
}

#drop-area:hover {
    background: #fff6c7;
}

#uploadBtn {
    width: 100%;
    background: #6f7057;
    color: white;
    border: none;
    padding: 14px;
    border-radius: 8px;
    margin-top: 20px;
    font-size: 17px;
    cursor: pointer;
}

#uploadBtn:disabled {
    background: #d1d1d1;
    cursor: not-allowed;
}

.log-box {
    margin-top: 25px;
    background: #f0f0f0;
    padding: 15px;
    border-radius: 8px;
    display: none;
}

pre {
    white-space: pre-wrap;
    word-wrap: break-word;
}