body {
    margin: 0;
    padding: 0;
    font-family: 'Segoe UI', sans-serif;
    background: linear-gradient(-45deg, #ff9a9e, #fad0c4, #ffdde1, #ee9ca7);
    background-size: 400% 400%;
    animation: gradientBG 10s ease infinite;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    overflow: hidden;
    text-align: center;
}

/* Background moving animation */
@keyframes gradientBG {
    0% {background-position: 0% 50%;}
    50% {background-position: 100% 50%;}
    100% {background-position: 0% 50%;}
}

.container {
    background: white;
    padding: 40px;
    border-radius: 20px;
    box-shadow: 0 15px 40px rgba(0,0,0,0.2);
    max-width: 400px;
    animation: fadeIn 2s ease-in-out;
}

/* Fade in animation */
@keyframes fadeIn {
    from {opacity: 0; transform: translateY(20px);}
    to {opacity: 1; transform: translateY(0);}
}

h1 {
    color: #ff4d6d;
    animation: heartbeat 1.5s infinite;
}

/* Heartbeat animation */
@keyframes heartbeat {
    0% { transform: scale(1); }
    25% { transform: scale(1.1); }
    50% { transform: scale(1); }
    75% { transform: scale(1.1); }
    100% { transform: scale(1); }
}

.message {
    margin: 15px 0;
    color: #555;
    font-size: 16px;
}

/* Glowing button */
button {
    padding: 12px 20px;
    border: none;
    border-radius: 25px;
    background: #ff4d6d;
    color: white;
    font-size: 16px;
    cursor: pointer;
    transition: 0.3s;
    box-shadow: 0 0 10px #ff4d6d;
}

button:hover {
    background: #e63950;
    box-shadow: 0 0 20px #ff4d6d;
    transform: scale(1.05);
}

#reply {
    margin-top: 20px;
    font-weight: bold;
    color: #ff4d6d;
}

/* Floating Hearts */
.heart {
    position: absolute;
    bottom: -20px;
    font-size: 20px;
    animation: floatUp 6s linear infinite;
    color: rgba(255, 77, 109, 0.6);
}

@keyframes floatUp {
    0% {
        transform: translateY(0) scale(1);
        opacity: 1;
    }
    100% {
        transform: translateY(-100vh) scale(1.5);
        opacity: 0;
    }
}