/* ==========================================================================
   06-NAVIGATION.CSS - Navigation & Header Styles
   ========================================================================== */

nav {
    position: relative;
    width: 100%;
    padding: 1.5rem var(--spacing-xl);
    background: rgba(0, 3, 35, 0.85);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--glass-border);
    z-index: var(--z-navigation);
    transition: all var(--transition-fast);
}

nav.scrolled {
    padding: 1rem var(--spacing-xl);
    background: rgba(0, 3, 35, 0.98);
    box-shadow: 0 10px 30px rgba(0, 3, 35, 0.5);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.8rem;
    font-weight: var(--font-weight-extrabold);
    letter-spacing: -0.5px;
    background: linear-gradient(135deg, var(--light-blue), var(--mint-green));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    text-decoration: none;
}

.brand-logo {
    height: 40px;
    width: auto;
    margin-right: 10px;
    vertical-align: middle;
}

.nav-links {
    display: flex;
    gap: var(--spacing-lg);
    list-style: none;
}

.nav-links a {
    color: var(--white);
    text-decoration: none;
    font-weight: var(--font-weight-medium);
    transition: all var(--transition-fast);
    position: relative;
    padding: var(--spacing-xs) 0;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--mint-green), var(--light-blue));
    transition: width var(--transition-fast);
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--light-blue);
}

.nav-links a:hover::after,
.nav-links a.active::after {
    width: 100%;
}

/* Mobile Navigation */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
    z-index: 1001;
}

.hamburger-line {
    width: 25px;
    height: 3px;
    background: var(--white);
    margin: 3px 0;
    transition: all 0.3s ease;
    border-radius: 2px;
}

.mobile-menu-toggle.active .hamburger-line:nth-child(1) {
    transform: rotate(-45deg) translate(-5px, 6px);
    background: var(--light-blue);
}

.mobile-menu-toggle.active .hamburger-line:nth-child(2) {
    opacity: 0;
}

.mobile-menu-toggle.active .hamburger-line:nth-child(3) {
    transform: rotate(45deg) translate(-5px, -6px);
    background: var(--light-blue);
}

.mobile-nav-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background: rgba(0, 3, 35, 0.98);
    backdrop-filter: blur(20px);
    display: flex;
    align-items: center;
    justify-content: center;
    transform: translateX(-100%);
    transition: transform 0.3s ease;
    z-index: 1000;
}

.mobile-nav-overlay.active {
    transform: translateX(0);
}

.mobile-nav-links {
    list-style: none;
    text-align: center;
}

.mobile-nav-links li {
    margin: 2rem 0;
}

.mobile-nav-link {
    color: var(--white);
    text-decoration: none;
    font-size: 1.5rem;
    font-weight: var(--font-weight-medium);
    transition: all var(--transition-fast);
    display: block;
    padding: 1rem 2rem;
    border-radius: var(--border-radius);
    position: relative;
}

.mobile-nav-link:hover,
.mobile-nav-link.active {
    color: var(--light-blue);
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
}

.mobile-nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--mint-green), var(--light-blue));
    transition: width var(--transition-fast);
}

.mobile-nav-link:hover::after,
.mobile-nav-link.active::after {
    width: 80%;
}

/* Responsive Design */
@media (max-width: 768px) {
    nav {
        padding: 1rem 1.5rem;
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        z-index: 1001;
    }
    
    /* Ensure body has top padding when nav is fixed */
    body {
        padding-top: 70px;
    }
    
    .brand-logo {
        height: 35px;
        margin-right: 8px;
    }
    
    .nav-links {
        display: none;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .logo {
        font-size: 0; /* Hide any text, show only logo image */
    }

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

@media (max-width: 480px) {
    nav {
        padding: 1rem;
    }
    
    .brand-logo {
        height: 32px;
        margin-right: 6px;
    }
    
    .logo {
        font-size: 0;
    }
    
    .mobile-nav-link {
        font-size: 1.3rem;
        padding: 0.8rem 1.5rem;
    }

    .hamburger-line {
        width: 22px;
        height: 2px;
    }
}