/* Navbar Grid & Glassmorphism */
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 100;
    background: rgba(4, 7, 16, 0.75);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border-color);
    transition: var(--transition-smooth);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 85px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
    color: var(--text-main);
    font-weight: 800;
    font-size: 1.35rem;
}

.logo-box {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary-light) 0%, var(--primary) 100%);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 15px rgba(245, 158, 11, 0.3);
}

.logo-box i {
    color: var(--bg-darker);
    font-size: 1.25rem;
}

nav {
    display: flex;
    gap: 2.25rem;
    align-items: center;
}

nav a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    transition: color 0.3s ease;
}

nav a:hover {
    color: var(--primary-light);
}

/* Hamburger Menu Button */
.hamburger {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 40px;
    height: 40px;
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    padding: 8px;
    transition: var(--transition-smooth);
}

.hamburger:hover {
    border-color: var(--primary-light);
    background: rgba(245, 158, 11, 0.1);
}

.hamburger span {
    display: block;
    width: 100%;
    height: 2px;
    background: var(--text-main);
    border-radius: 2px;
    transition: var(--transition-smooth);
}

.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.hamburger.active span:nth-child(2) {
    opacity: 0;
}

.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* Mobile Navigation Overlay */
.mobile-nav {
    display: none;
    position: fixed;
    top: 85px;
    left: 0;
    width: 100%;
    height: calc(100vh - 85px);
    background: rgba(4, 7, 16, 0.95);
    backdrop-filter: blur(20px);
    z-index: 99;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2rem;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-smooth);
}

.mobile-nav.active {
    opacity: 1;
    visibility: visible;
}

.mobile-nav a {
    color: var(--text-main);
    text-decoration: none;
    font-size: 1.5rem;
    font-weight: 600;
    transition: color 0.3s ease;
}

.mobile-nav a:hover {
    color: var(--primary-light);
}

@media (max-width: 900px) {
    nav {
        display: none;
    }
    .hamburger {
        display: flex;
    }
    .mobile-nav {
        display: flex;
    }
    .nav-container {
        height: 70px;
    }
    .logo {
        font-size: 1.15rem;
    }
    .logo-box {
        width: 36px;
        height: 36px;
    }
}