#header {
    background: linear-gradient(90deg, #006994 0%, #003366 100%);
    color: white;
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
    animation: headerSlide 15s linear infinite;
    background-size: 200% 100%;
}

@keyframes headerSlide {
    0% {
        background-position: 0% 50%;
    }
    100% {
        background-position: 200% 50%;
    }
}

#site-name a {
    color: white !important;
    font-size: 24px;
    font-weight: bold;
    text-decoration: none;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
    transition: all 0.8s ease;
    display: inline-block;
    position: relative;
}

#site-name a::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 2px;
    bottom: -5px;
    left: 0;
    background: linear-gradient(90deg, #fff 0%, rgba(255,255,255,0.5) 100%);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.5s ease;
}

#site-name a:hover::after {
    transform: scaleX(1);
}

#site-name a:hover {
    text-shadow: 4px 4px 8px rgba(0,102,153,0.6);
    transform: translateX(10px);
}

.theme-toggle {
    background: rgba(255,255,255,0.15);
    padding: 5px 10px;
    border-radius: 20px;
    margin-left: 15px;
    backdrop-filter: blur(5px);
    transition: all 0.6s ease;
    position: relative;
    overflow: hidden;
}

.theme-toggle::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: 0.5s;
}

.theme-toggle:hover::before {
    left: 100%;
}