body {
    background: #f0f2f5;
    font-family: 'Segoe UI', sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
}

.card {
    background: #fff;
    padding: 2rem;
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    width: 350px;
    text-align: center;
}

h2 { color: #1a73e8; margin-bottom: 1.5rem; }

input {
    width: 100%;
    padding: 12px;
    margin-bottom: 10px;
    border: 1.5px solid #eee;
    border-radius: 10px;
    box-sizing: border-box;
    transition: 0.3s;
}

input:focus { border-color: #1a73e8; outline: none; }

button {
    width: 100%;
    padding: 14px;
    background: #1a73e8;
    color: white;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    font-weight: bold;
    font-size: 16px;
}

button:hover { background: #1557b0; }

.result-area { margin-top: 20px; animation: slideUp 0.4s ease; }

#qrcode {
    background: #fff;
    padding: 10px;
    display: inline-block;
    border: 1px solid #ddd;
    border-radius: 10px;
}

.download-btn {
    background: #34a853;
    margin-top: 15px;
}

@keyframes slideUp { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }