body {
    font-family: Arial, sans-serif;
    background: #f4f6f9;
    display: flex;
    justify-content: center;
    padding-top: 60px;
}

.container {
    background: white;
    padding: 40px;
    border-radius: 10px;
    width: 480px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

h2 {
    text-align: center;
    margin-bottom: 30px;
}

.upload-box {
    margin: 20px 0;
}

input[type="file"] {
    width: 100%;
    padding: 10px;
}

.btn {
    display: block;
    width: 100%;
    padding: 12px;
    margin-top: 10px;
    text-align: center;
    border-radius: 6px;
    text-decoration: none;
    font-weight: bold;
}

.upload { background: #28a745; color: white; }
.download { background: #007bff; color: white; }
.report { background: #ffc107; color: black; }

.btn:hover { opacity: 0.9; }