/* Header Styles */
header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(15px);
    padding: 1rem 0;
    box-shadow: 0 2px 20px var(--shadow-light);
    border-bottom: 1px solid var(--border-color);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    transition: all 0.3s ease;
}

header.scrolled {
    background: rgba(255, 255, 255, 0.98);
    box-shadow: 0 4px 30px var(--shadow-medium);
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.logo {
    height: 60px;
    transition: transform 0.3s ease;
    filter: drop-shadow(2px 2px 4px rgba(0,0,0,0.1));
}

.logo:hover {
    transform: scale(1.05);
    animation: pulse 2s infinite;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 1rem;
}

.nav-links li {
    opacity: 1;
    transform: translateY(0);
}

.nav-links a {
    color: var(--dark-text);
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    padding: 0.8rem 1.5rem;
    border-radius: 25px;
    position: relative;
    overflow: hidden;
}

.nav-links a:hover {
    color: var(--primary-white);
    background: linear-gradient(135deg, var(--primary-blue), var(--light-blue));
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(74, 144, 226, 0.3);
}

.nav-links a.active {
    background: linear-gradient(135deg, var(--primary-blue), var(--light-blue));
    color: var(--primary-white);
}

/* Mobile menu toggle */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
    padding: 0.5rem;
}

.mobile-menu-toggle span {
    width: 25px;
    height: 3px;
    background: var(--dark-text);
    margin: 3px 0;
    transition: 0.3s;
}

@keyframes slideInDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .mobile-menu-toggle {
        display: flex;
    }
    .nav-links a::before {
        content: '';
        position: absolute;
        top: 0;
        left: -100%;
        width: 100%;
        height: 100%;
        background: linear-gradient(135deg, var(--primary-blue), var(--light-blue));
        transition: left 0.3s ease;
        z-index: -1;
    }
    
    .nav-links a:hover::before {
        left: 0;
    }
    
    .nav-links {
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: rgba(255, 255, 255, 0.98);
        flex-direction: column;
        padding: 1rem 0;
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all 0.3s ease;
        box-shadow: 0 5px 20px rgba(0,0,0,0.1);
    }
    
    .nav-links.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .nav-links li {
        margin: 0.5rem 0;
        text-align: center;
        opacity: 0;
        transform: translateY(-20px);
        animation: slideInDown 0.6s ease forwards;
    }
    
    .nav-links.active li:nth-child(1) { animation-delay: 0.1s; }
    .nav-links.active li:nth-child(2) { animation-delay: 0.2s; }
    .nav-links.active li:nth-child(3) { animation-delay: 0.3s; }
    
    .nav-links a {
        display: block;
        padding: 1rem;
        margin: 0 1rem;
    }
}