.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    background: rgba(10, 10, 15, 0.9);
    backdrop-filter: blur(10px);
    z-index: 1000;
    transition: var(--transition-base);
}

.header.scrolled {
    background: rgba(10, 10, 15, 0.98);
    box-shadow: var(--shadow-md);
}

.nav {
    height: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    display: flex;
    align-items: center;
}

.nav-logo img {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    border: 1px solid var(--primary);
    transition: var(--transition-base);
}

.nav-menu {
    display: flex;
}

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

.nav-link {
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 1.8rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    position: relative;
    transition: var(--transition-fast);
}

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

.nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 4px;
    width: 30px;
    height: 30px;
    cursor: pointer;
}

.nav-toggle span {
    width: 100%;
    height: 3px;
    background: var(--primary);
    border-radius: 3px;
    transition: var(--transition-base);
}

@media (max-width: 768px) {
    .header {
        height: 70px;
        --header-height: 70px;
    }

    .nav-logo img {
        width: 50px;
        height: 50px;
    }

    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background: var(--bg-primary);
        transition: var(--transition-base);
        z-index: 999;
        overflow-y: auto;
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-list {
        flex-direction: column;
        padding: var(--spacing-lg) var(--spacing-md);
        gap: 0;
        height: 100%;
    }

    .nav-item {
        width: 100%;
        border-bottom: 1px solid var(--border-color);
    }

    .nav-link {
        display: flex;
        align-items: center;
        gap: 15px;
        padding: 20px 0;
        font-size: 1.8rem;
        width: 100%;
        border-radius: 0;
    }

    .nav-link i {
        font-size: 2.2rem;
    }

    .nav-toggle {
        display: flex;
    }

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

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

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

@media (max-width: 480px) {
    .nav-logo img {
        width: 45px;
        height: 45px;
    }
}