body {
    font-family: Arial, sans-serif;
    background: #f0f2f5;
    margin: 0;
    padding: 20px;
}
.container {
    max-width: 600px;
    margin: 40px auto;
    background: white;
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    text-align: center;
}
h1 { color: #1a73e8; margin-bottom: 5px; }
.tabs { margin: 25px 0; }
.tab-btn {
    padding: 12px 25px;
    border: none;
    background: #e0e0e0;
    cursor: pointer;
    margin: 0 5px;
    border-radius: 8px;
    font-size: 16px;
}
.tab-btn.active { background: #1a73e8; color: white; }
.tab-content { display: none; }
.tab-content.active { display: block; }
.btn {
    background: #1a73e8;
    color: white;
    border: none;
    padding: 12px 30px;
    border-radius: 8px;
    font-size: 16px;
    cursor: pointer;
    text-decoration: none;
    display: inline-block;
}
.btn:hover { background: #1557b0; }
.result { text-align: left; margin: 15px 0; }
input[type="file"] { margin: 15px 0; }