body {
    background: linear-gradient(135deg, #ff9a9e 0%, #fecfef 99%, #fecfef 100%);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    font-family: 'Poppins', sans-serif;
    overflow-x: hidden;
}

header {
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
}

main {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.container {
    text-align: center;
    position: relative;
    width: 100%;
    max-width: 600px;
}

.valentine-card {
    background: rgba(255, 255, 255, 0.9);
    padding: 40px;
    border-radius: 30px;
    box-shadow: 0 10px 40px rgba(255, 105, 180, 0.3);
    border: 2px solid #fff;
    transition: all 0.3s ease;
}

.sticker-container {
    height: 150px;
    display: flex;
    justify-content: center;
    align-items: center;
    margin-bottom: 20px;
}

.emoji-sticker {
    font-size: 8rem;
    animation: bounce 2s infinite;
}

.question {
    font-family: 'Dancing Script', cursive;
    color: #ff4757;
    font-size: 3rem;
    margin-bottom: 40px;
    line-height: 1.2;
}

.buttons {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 20px;
    flex-wrap: wrap;
    min-height: 100px; /* Space for growing button */
}

button {
    padding: 15px 30px;
    font-size: 1.2rem;
    border: none;
    border-radius: 50px;
    cursor: pointer;
    font-family: 'Poppins', sans-serif;
    font-weight: 600;
    transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}

.yes-btn {
    background-color: #2ed573;
    color: white;
}

.yes-btn:hover {
    background-color: #26af61;
    transform: scale(1.05);
}

.no-btn {
    background-color: #ff4757;
    color: white;
}

.no-btn:hover {
    background-color: #ff2e42;
}

/* Animations */
@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

@keyframes shake {
    0% { transform: translate(1px, 1px) rotate(0deg); }
    10% { transform: translate(-1px, -2px) rotate(-1deg); }
    20% { transform: translate(-3px, 0px) rotate(1deg); }
    30% { transform: translate(3px, 2px) rotate(0deg); }
    40% { transform: translate(1px, -1px) rotate(1deg); }
    50% { transform: translate(-1px, 2px) rotate(-1deg); }
    60% { transform: translate(-3px, 1px) rotate(0deg); }
    70% { transform: translate(3px, 1px) rotate(-1deg); }
    80% { transform: translate(-1px, -1px) rotate(1deg); }
    90% { transform: translate(1px, 2px) rotate(0deg); }
    100% { transform: translate(1px, -2px) rotate(-1deg); }
}

.shake {
    animation: shake 0.5s;
}

/* Response Text Styling */
.response-text {
    font-size: 1.5rem;
    color: #555;
    margin-top: 20px;
    font-style: italic;
    opacity: 0;
    animation: fadeIn 0.5s forwards;
}

@keyframes fadeIn {
    to { opacity: 1; }
}