* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* Mobile flicker fix */
html {
    -webkit-tap-highlight-color: transparent;
    -webkit-overflow-scrolling: touch;
}

body {
    min-height: 100vh;
    background: 
        linear-gradient(45deg, 
            #620080 25%, 
            #8a2be2 75%);
    font-family: 'Courier New', monospace;
    overflow: hidden;
    position: relative;
    /* Hardware acceleration */
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
    transform: translateZ(0);
}

body::before {
    content: '';
    position: fixed;
    width: 100%;
    height: 100%;
    background-image: url("data:image/svg+xml,%3Csvg width='52' height='52' viewBox='0 0 52 52' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M26 35.5C17.6 35.5 4 29.5 4 17.5 4 9.5 11.7 3 21.5 3c5.1 0 8.7 2.5 11.5 6 2.8-3.5 6.4-6 11.5-6C40.3 3 48 9.5 48 17.5c0 12-13.6 18-22 18z' fill='%23ffffff' fill-opacity='0.05' fill-rule='evenodd'/%3E%3C/svg%3E");
    z-index: -1;
    pointer-events: none;
    will-change: transform;
}

.love-particle {
    position: absolute;
    font-size: 24px;
    opacity: 0;
    animation: float 6s linear infinite;
    will-change: transform;
    -webkit-font-smoothing: subpixel-antialiased;
}

@keyframes float {
    0% { transform: translateY(100vh) rotate(0deg); opacity: 1; }
    100% { transform: translateY(-100vh) rotate(360deg); opacity: 0; }
}

.message-container {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    color: #fff;
    width: 80%;
    max-width: 800px;
}

.message {
    opacity: 0;
    position: absolute;
    font-size: 2.5rem;
    text-shadow: 0 0 15px rgba(255,50,150,0.5);
    transform: translateY(50px);
    transition: all 1.5s ease-in-out;
    will-change: transform, opacity;
}

.message.active {
    opacity: 1;
    transform: translateY(0);
}

.message.exit {
    opacity: 0;
    transform: translateY(-50px) scale(0.8);
}

.final-question {
    display: none;
    opacity: 0;
    transform: scale(0.5);
    animation: reveal 1s forwards;
}

@keyframes reveal {
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.btn-group {
    margin-top: 2rem;
    display: flex;
    gap: 1rem;
    justify-content: center;
}

.valentine-btn {
    padding: 1rem 2rem;
    font-size: 1.5rem;
    border: none;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
    -webkit-tap-highlight-color: transparent;
}

.yes-btn {
    background: #ff4081;
    color: white;
}

.no-btn {
    background: #616161;
    color: white;
}

.valentine-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(255,64,129,0.4);
}

.valentine-btn::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 300px;
    height: 300px;
    background: rgba(255,255,255,0.2);
    border-radius: 50%;
    transform: translate(-50%, -50%) scale(0);
    animation: ripple 0.6s ease-out;
}

@keyframes ripple {
    to {
        transform: translate(-50%, -50%) scale(1);
        opacity: 0;
    }
}

.celebration {
    position: fixed;
    width: 100vw;
    height: 100vh;
    pointer-events: none;
    z-index: 1000;
    display: none;
}

.heart-burst {
    position: absolute;
    font-size: 2rem;
    animation: burst 1s ease-out forwards;
    will-change: transform;
}

@keyframes burst {
    0% { transform: scale(0); opacity: 1; }
    100% { transform: scale(5); opacity: 0; }
}