/* ================================================
   HEADER NAVIGATION
   ================================================ */

.main-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    width: 100%;
    background-color: rgba(15, 21, 23, 0.95);
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    transition: background-color var(--transition-base), box-shadow var(--transition-base);
}

.main-header.scrolled {
    background-color: rgba(15, 21, 23, 0.98);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}

.main-nav {
    width: 100%;
    padding: 0;
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-md) var(--spacing-3xl);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo a {
    font-family: var(--font-heading);
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--color-accent-yellow-alt);
    text-decoration: none;
    transition: color var(--transition-base);
    letter-spacing: 1px;
}

.logo a:hover {
    color: var(--color-accent-yellow);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-3xl);
    align-items: center;
    margin: 0;
    padding: 0;
}

.nav-link {
    font-family: var(--font-primary);
    font-size: var(--font-size-base);
    font-weight: 500;
    color: #ffffff;
    text-decoration: none;
    position: relative;
    transition: color var(--transition-base);
    padding: var(--spacing-xs) 0;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-accent-yellow-alt);
    transition: width var(--transition-base);
}

.nav-link:hover {
    color: var(--color-accent-yellow-alt);
}

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

.nav-link.active {
    color: var(--color-accent-yellow-alt);
}

.mobile-menu-toggle {
    display: none;
    position: relative;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
    z-index: 1001;
    width: 24px;
    height: 24px;
}

.mobile-menu-toggle svg {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    transition: opacity var(--transition-base), transform var(--transition-base);
    color: var(--color-accent-yellow-alt);
}

.mobile-menu-toggle .menu-icon {
    opacity: 1;
    transform: translate(-50%, -50%) rotate(0deg);
}

.mobile-menu-toggle .close-icon {
    opacity: 0;
    transform: translate(-50%, -50%) rotate(90deg);
}

.mobile-menu-toggle.active .menu-icon {
    opacity: 0;
    transform: translate(-50%, -50%) rotate(-90deg);
}

.mobile-menu-toggle.active .close-icon {
    opacity: 1;
    transform: translate(-50%, -50%) rotate(0deg);
}

/* ================================================
   RESPONSIVE HEADER
   ================================================ */
@media (max-width: 768px) {
    .nav-container {
        padding: var(--spacing-xs) var(--spacing-sm);
    }

    .logo a {
        font-size: var(--font-size-lg);
        letter-spacing: 0.5px;
    }

    .mobile-menu-toggle {
        display: flex;
        width: 20px;
        height: 20px;
    }

    .mobile-menu-toggle svg {
        width: 20px;
        height: 20px;
    }

    .nav-menu {
        position: fixed;
        top: 50px;
        left: 0;
        right: 0;
        background-color: rgba(15, 21, 23, 0.98);
        flex-direction: column;
        padding: var(--spacing-xl) var(--spacing-lg);
        gap: var(--spacing-md);
        transform: translateX(-100%);
        transition: transform var(--transition-base);
        box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    }

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

    .nav-link {
        font-size: var(--font-size-base);
        width: 100%;
        text-align: center;
        padding: var(--spacing-xs) 0;
    }
}