body {
    font-family: Arial, sans-serif;
    background: #eef2f7;
    margin: 0;
    padding: 40px;
    color: #1f2937;
}

.container {
    max-width: 760px;
    margin: auto;
}

.card {
    background: white;
    padding: 42px;
    border-radius: 18px;
    box-shadow: 0 18px 45px rgba(15, 23, 42, 0.12);
}

h1 {
    margin-top: 0;
    margin-bottom: 8px;
    font-size: 32px;
}

.subtitle {
    color: #64748b;
    margin-bottom: 30px;
}

.dropzone {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 150px;
    border: 2px dashed #94a3b8;
    border-radius: 16px;
    cursor: pointer;
    background: #f8fafc;
    margin-bottom: 24px;
    text-align: center;
    padding: 20px;
}

.dropzone:hover {
    background: #f1f5f9;
}

input[type=file] {
    display: none;
}

button {
    background: #2563eb;
    color: white;
    border: none;
    padding: 14px 24px;
    border-radius: 10px;
    cursor: pointer;
    font-size: 16px;
}

button:hover {
    background: #1d4ed8;
}

button:disabled {
    background: #94a3b8;
    cursor: not-allowed;
}

#status {
    margin-top: 26px;
    font-size: 18px;
}

.success {
    color: #15803d;
    font-weight: bold;
}

.error {
    color: #b91c1c;
    font-weight: bold;
}

.download-btn {
    display: inline-block;
    margin-top: 24px;
    background: #16a34a;
    color: white;
    padding: 14px 24px;
    text-decoration: none;
    border-radius: 10px;
    font-weight: bold;
}

.download-btn:hover {
    background: #15803d;
}