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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    overflow: hidden;
}

.container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    position: relative;
}

.hello-world {
    position: relative;
    z-index: 10;
}

.title {
    font-size: 8rem;
    font-weight: 900;
    color: #ffffff;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    text-align: center;
    animation: float 3s ease-in-out infinite;
    text-shadow: 
        0 0 10px rgba(255, 255, 255, 0.5),
        0 0 20px rgba(255, 255, 255, 0.4),
        0 0 30px rgba(255, 255, 255, 0.3),
        0 0 40px rgba(102, 126, 234, 0.5),
        0 0 70px rgba(118, 75, 162, 0.5),
        0 0 80px rgba(118, 75, 162, 0.4),
        0 0 100px rgba(118, 75, 162, 0.3);
    transition: all 0.3s ease;
    cursor: pointer;
}

.title:hover {
    transform: scale(1.1);
    text-shadow: 
        0 0 20px rgba(255, 255, 255, 0.8),
        0 0 40px rgba(255, 255, 255, 0.6),
        0 0 60px rgba(255, 255, 255, 0.4),
        0 0 80px rgba(102, 126, 234, 0.8),
        0 0 120px rgba(118, 75, 162, 0.8),
        0 0 140px rgba(118, 75, 162, 0.6),
        0 0 160px rgba(118, 75, 162, 0.4);
}

@keyframes float {
    0%, 100% {
        transform: translateY(0px);
    }
    50% {
        transform: translateY(-20px);
    }
}

.particles {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
    pointer-events: none;
}

.particle {
    position: absolute;
    width: 4px;
    height: 4px;
    background: rgba(255, 255, 255, 0.8);
    border-radius: 50%;
    animation: rise linear infinite;
    box-shadow: 0 0 10px rgba(255, 255, 255, 0.8);
}

@keyframes rise {
    0% {
        opacity: 0;
        transform: translateY(0) scale(1);
    }
    10% {
        opacity: 1;
    }
    90% {
        opacity: 1;
    }
    100% {
        opacity: 0;
        transform: translateY(-100vh) scale(0);
    }
}

@media (max-width: 768px) {
    .title {
        font-size: 4rem;
    }
}

@media (max-width: 480px) {
    .title {
        font-size: 2.5rem;
    }
}