body {
    margin: 0;
    padding: 0;
    font-family: Arial;
    background: linear-gradient(135deg, #ff9a9e, #fad0c4);
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
}

.container {
    text-align: center;
    background: white;
    padding: 30px;
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
}

input {
    padding: 10px;
    width: 200px;
    border-radius: 10px;
    border: 1px solid #ccc;
    margin: 10px;
}

button {
    padding: 10px 20px;
    border: none;
    border-radius: 10px;
    background: #ff4b5c;
    color: white;
    font-size: 16px;
    cursor: pointer;
}

button:hover {
    background: #ff1e3c;
}

#error {
    color: red;
    margin-top: 10px;
}

.hidden {
    display: none;
}

#giftBox h1 {
    color: #ff4b5c;
}

.heart {
    font-size: 50px;
    animation: beat 1s infinite;
}

@keyframes beat {
    0% { transform: scale(1); }
    50% { transform: scale(1.2); }
    100% { transform: scale(1); }
}