/* Header layout */
.site-header {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    z-index: 1000;
}

.brand {
    display: inline-flex;
    align-items: center;
    flex-shrink: 0;
}

.brand-logo {
    display: block;
    max-width: 180px;
    height: auto;
}

/* Desktop navigation */
.main-nav {
    display: flex;
    align-items: center;
    gap: 24px;
}

.main-nav a {
    text-decoration: none;
}

/* Hamburger button: hidden on desktop */
.menu-toggle {
    display: none;
    width: 44px;
    height: 44px;
    padding: 10px;
    border: 1px solid #e0e3eb;
    border-radius: 10px;
    background: #fff;
    cursor: pointer;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 5px;
}

.menu-toggle span {
    display: block;
    width: 22px;
    height: 2px;
    border-radius: 2px;
    background: #252b4a;
    transition: transform 0.2s ease, opacity 0.2s ease;
}

/* Mobile navigation */
@media (max-width: 768px) {
    .site-header {
        flex-wrap: wrap;
    }

    .menu-toggle {
        display: flex;
        margin-left: auto;
    }

    .main-nav {
        display: none;
        flex-direction: column;
        align-items: stretch;
        gap: 0;
        width: 100%;
        padding: 8px 0;
        margin-top: 8px;
        background: #fff;
        border: 1px solid #e7e9f1;
        border-radius: 12px;
        box-shadow: 0 8px 24px rgba(20, 30, 70, 0.10);
    }

    .main-nav.open {
        display: flex;
    }

    .main-nav a {
        display: block;
        padding: 13px 16px;
        color: #252b4a;
    }

    .main-nav a:hover,
    .main-nav a:focus-visible {
        background: #f1f3ff;
        color: #4f46e5;
    }

    /* Animate hamburger into an X */
    .menu-toggle[aria-expanded="true"] span:nth-child(1) {
        transform: translateY(7px) rotate(45deg);
    }

    .menu-toggle[aria-expanded="true"] span:nth-child(2) {
        opacity: 0;
    }

    .menu-toggle[aria-expanded="true"] span:nth-child(3) {
        transform: translateY(-7px) rotate(-45deg);
    }
}