/* Navigation and Header Styles */
header {
    padding: 20px 0;
    position: fixed;
    width: 100%;
    top: 0;
    left: 0;
    z-index: 1000;
    transition: all 0.3s ease;
    background-color: rgba(248, 249, 254, 0.95);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

header.scrolled {
    padding: 12px 0;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 24px;
    font-weight: 700;
    color: var(--primary-color);
    letter-spacing: -0.5px;
    text-decoration: none;
    position: relative;
    z-index: 2;
}

/* Navigation Menu */
.nav-menu {
    display: flex;
    gap: 32px;
    align-items: center;
}

.nav-link {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-secondary);
    transition: color 0.3s ease;
    position: relative;
    text-decoration: none;
}

.nav-link:hover, .nav-link.active {
    color: var(--primary-color);
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 100%;
    height: 2px;
    background: linear-gradient(to right, var(--primary-color), var(--tertiary-color));
    border-radius: 2px;
}

/* Mobile Menu */
.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    z-index: 1001;
    cursor: pointer;
    width: 28px;
    height: 28px;
    position: relative;
}

.mobile-menu-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.4);
    z-index: 999;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.mobile-menu-overlay.active {
    display: block;
    opacity: 1;
}

/* Mobile Navigation */
@media (max-width: 991px) {
    .mobile-menu-toggle {
        display: flex;
        align-items: center;
        justify-content: center;
    }
    
    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        max-width: 300px;
        height: 100vh;
        background-color: var(--light-surface);
        flex-direction: column;
        justify-content: flex-start;
        padding: 90px 32px 40px;
        transition: right 0.3s cubic-bezier(0.77, 0, 0.175, 1);
        box-shadow: -5px 0 30px rgba(0, 0, 0, 0.1);
        z-index: 1000;
        overflow-y: auto;
    }
    
    .nav-menu.active {
        right: 0;
    }
    
    .nav-link {
        font-size: 18px;
        padding: 16px 0;
        display: block;
        width: 100%;
        text-align: left;
        border-bottom: 1px solid rgba(100, 116, 139, 0.1);
    }
    
    .nav-link:last-child {
        border-bottom: none;
    }
    
    .nav-link.active::after {
        display: none;
    }
}

/* Prevent body scroll when mobile menu is open */
body.menu-open {
    overflow: hidden;
    position: fixed;
    width: 100%;
    height: 100%;
}

/* Dark mode styles for mobile menu */
.dark-mode .mobile-menu-toggle .menu-icon,
.dark-mode .mobile-menu-toggle .menu-icon:before,
.dark-mode .mobile-menu-toggle .menu-icon:after {
    background-color: #FFFFFF;
}

.dark-mode .mobile-menu-toggle.active .menu-icon {
    background-color: transparent;
}

.dark-mode .nav-menu {
    background-color: var(--dark-surface);
}

.dark-mode .nav-link {
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

/* Fix for header on small screens */
@media (max-width: 576px) {
    .logo {
        font-size: 20px;
    }
}