/* ========== HEADER & NAVIGATION ========== */
header {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(15, 23, 42, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--primary-color);
    z-index: 100;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
}

.logo img {
    height: 56px;
    width: auto;
    display: block;
}

nav ul {
    list-style: none;
    display: flex;
    margin: 0;
}

nav ul li {
    margin-left: 2rem;
}

nav ul li a {
    color: var(--light-text);
    text-decoration: none;
    transition: all 0.3s ease;
    padding-bottom: 0.3rem;
    border-bottom: 2px solid transparent;
}

nav ul li a:hover {
    color: var(--accent-color);
    border-bottom-color: var(--accent-color);
}

.social {
    display: flex;
}

.social a {
    color: var(--light-text);
    text-decoration: none;
    margin-left: 1rem;
    font-size: 1.2rem;
    transition: all 0.3s ease;
}

.social a:hover {
    color: var(--accent-color);
    transform: scale(1.3) translateY(-3px);
}

/* ========== HAMBURGER MENU ========== */
.nav-menu-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 5px;
}

.nav-menu-toggle span {
    width: 25px;
    height: 3px;
    background: var(--light-text);
    border-radius: 2px;
    transition: all 0.3s ease;
}

.nav-menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(8px, 8px);
}

.nav-menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.nav-menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -7px);
}

/* ========== RESPONSIVE HEADER ========== */
@media (max-width: 768px) {
    header {
        padding: 0.75rem 0;
    }
    
    nav {
        position: relative;
        padding: 0.75rem 1rem;
    }
    
    .logo {
        height: 48px;
    }
    
    .logo img {
        max-height: 48px;
    }
    
    .nav-menu-toggle {
        display: flex;
        width: 28px;
        height: 28px;
        cursor: pointer;
    }

    .nav-menu-toggle span {
        height: 3px;
    }
    
    #nav-menu {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: rgba(15, 23, 42, 0.98);
        border-bottom: 1px solid rgba(255,255,255,0.1);
        flex-direction: column !important;
        padding: 0.5rem 0;
        max-height: 0;
        overflow: hidden;
        overflow-x: hidden;
        transition: max-height 0.3s ease;
    }

    #nav-menu.active {
        max-height: 400px;
    }

    #nav-menu li {
        border-bottom: 1px solid rgba(255,255,255,0.05);
        width: 100%;
        padding: 0.75rem 1rem;
    }

    #nav-menu a {
        display: block;
        white-space: nowrap;
    }

    #nav-menu a {
        padding: 0.75rem 1rem;
        font-size: 0.95rem;
    }

    .social {
        display: none;
    }
}