/* Header styles */
header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 50px 40px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

header::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.15) 0%, transparent 70%);
    animation: pulse 20s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
        opacity: 0.5;
    }
    50% {
        transform: scale(1.1);
        opacity: 0.8;
    }
}

header h1 {
    font-size: 2.8em;
    margin-bottom: 12px;
    font-weight: 700;
    text-shadow: 0 2px 20px rgba(0, 0, 0, 0.5);
    position: relative;
    z-index: 1;
    letter-spacing: -0.5px;
}

.subtitle {
    font-size: 1.15em;
    opacity: 0.95;
    font-weight: 400;
    position: relative;
    z-index: 1;
    letter-spacing: 0.3px;
    text-shadow: 0 1px 10px rgba(0, 0, 0, 0.3);
}