.main-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background-color: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.3);
    transition: var(--transition);
    padding: 0.75rem 0;
}

.main-header.scrolled {
    padding: 0.5rem 0;
    box-shadow: var(--shadow);
    background-color: rgba(255, 255, 255, 0.95);
}

.header-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
    transition: var(--transition);
}

.logo i {
    font-size: 1.75rem;
    color: var(--primary);
}

.logo-text {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--text);
    letter-spacing: -0.5px;
}

.logo-text span {
    color: var(--primary);
}

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

.nav-list {
    list-style: none;
    display: flex;
    gap: 2.5rem;
    margin: 0;
    padding: 0;
}

.nav-link {
    text-decoration: none;
    color: var(--text-muted);
    font-weight: 500;
    font-size: 1rem;
    position: relative;
    padding: 0.5rem 0;
    transition: var(--transition);
}

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

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

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

.btn-cta {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background-color: var(--primary);
    color: var(--white);
    padding: 0.6rem 1.5rem;
    border-radius: var(--radius);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
    box-shadow: 0 4px 12px rgba(var(--primary-rgb), 0.2);
}

.btn-cta:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
}

.mobile-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text);
    cursor: pointer;
}

@media (max-width: 768px) {
    .mobile-toggle {
        display: block;
        order: 2;
    }

    .logo {
        order: 1;
    }

    .header-actions {
        display: none; /* Ẩn nút CTA trên mobile để tối ưu không gian hoặc có thể chuyển vào menu */
    }

    .nav-menu {
        display: block; /* Override desktop display: flex */
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background-color: var(--white);
        padding: 0;
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.4s ease-in-out;
        box-shadow: var(--shadow);
    }

    .nav-menu.active {
        max-height: 400px;
        padding: 1.5rem 0;
    }

    .nav-list {
        flex-direction: column;
        align-items: center;
        gap: 1.5rem;
    }

    .nav-link {
        font-size: 1.1rem;
    }
}