* {
    box-sizing: border-box;
}

body { 
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif; 
    margin: 0;
    padding: 2rem;
    min-height: 100vh;
    color: #212529; 
    animation: fadeIn 0.8s ease-out;
    position: relative;
    overflow-x: hidden;
}

.background-gradient {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(600px circle at var(--mouse-x, 50%) var(--mouse-y, 50%), 
                rgba(59, 130, 246, 0.15) 0%, 
                rgba(139, 92, 246, 0.1) 25%, 
                rgba(236, 72, 153, 0.08) 50%, 
                rgba(248, 250, 252, 0.95) 100%);
    z-index: -2;
    transition: background 0.3s ease;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        linear-gradient(135deg, rgba(255,255,255,0.1) 0%, transparent 50%),
        linear-gradient(45deg, rgba(59, 130, 246, 0.05) 0%, transparent 100%);
    z-index: -1;
    pointer-events: none;
}