/* ==========================================================
   header.css — Site header, logo, primary navigation, dropdowns
   ========================================================== */

#site-header {
    position: sticky;
    top: 0;
    z-index: 500;
    background: var(--color-white);
    border-bottom: 1px solid var(--color-light-grey);
}

#site-header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-block: 0.85rem;
}

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

.brand-link img {
    height: 46px;
    width: auto;
}

/* ---- Primary nav ---- */
#site-navigation {
    display: flex;
    align-items: center;
}

#site-navigation > ul {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    list-style: none;
    margin: 0;
    padding: 0;
}

#site-navigation > ul > li {
    position: relative;
}

#site-navigation > ul > li > a,
#site-navigation > ul > li > button.nav-toggle {
    display: flex;
    align-items: center;
    gap: 0.3rem;
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--color-navy);
    padding: 0.5rem 0;
    background: none;
    border: none;
    cursor: pointer;
    transition: color var(--transition-fast);
}

#site-navigation > ul > li > a:hover,
#site-navigation > ul > li > button.nav-toggle:hover,
#site-navigation > ul > li.is-open > button.nav-toggle {
    color: var(--color-red);
}

.nav-toggle .chevron {
    width: 10px;
    height: 10px;
    border-right: 2px solid currentColor;
    border-bottom: 2px solid currentColor;
    transform: rotate(45deg);
    transition: transform var(--transition-fast);
    margin-top: -3px;
}

.nav-toggle[aria-expanded="true"] .chevron {
    transform: rotate(-135deg);
    margin-top: 3px;
}

/* ---- Dropdown panels ---- */
.nav-dropdown {
    position: absolute;
    top: calc(100% + 0.85rem);
    left: 50%;
    transform: translateX(-50%) translateY(8px);
    background: var(--color-white);
    border: 1px solid var(--color-light-grey);
    border-radius: var(--radius-md);
    box-shadow: 0 16px 40px rgba(15, 23, 42, 0.14);
    min-width: 240px;
    list-style: none;
    margin: 0;
    padding: 0.5rem;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-fast), transform var(--transition-fast), visibility var(--transition-fast);
}

li.is-open .nav-dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}

.nav-dropdown li a {
    display: block;
    padding: 0.65rem 0.85rem;
    border-radius: var(--radius-sm);
    font-family: var(--font-body);
    font-weight: 500;
    font-size: 0.92rem;
    color: var(--color-charcoal);
    transition: background var(--transition-fast), color var(--transition-fast);
}

.nav-dropdown li a:hover {
    background: var(--color-bg-grey);
    color: var(--color-red);
}

/* ---- Contact CTA button in nav ---- */
.nav-cta {
    background: var(--color-red);
    color: var(--color-white) !important;
    padding: 0.65rem 1.35rem !important;
    border-radius: var(--radius-sm);
}

.nav-cta:hover {
    background: var(--color-red-dark);
    color: var(--color-white) !important;
}

/* ---- Mobile menu toggle (hidden on desktop) ---- */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 44px;
    height: 44px;
    background: none;
    border: none;
    cursor: pointer;
}

.mobile-menu-toggle span {
    display: block;
    height: 2px;
    width: 26px;
    background: var(--color-navy);
    transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.mobile-menu-toggle[aria-expanded="true"] span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

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

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

/* ==========================================================
   RESPONSIVE — below 960px, collapse to mobile menu
   ========================================================== */
@media (max-width: 960px) {
    .mobile-menu-toggle {
        display: flex;
    }

    #site-navigation {
        position: fixed;
        top: 0;
        right: 0;
        height: 100vh;
        height: 100dvh; /* dynamic viewport height — avoids miscalculation in
                            in-app browsers (WhatsApp, Instagram, etc.) that
                            don't account for their own toolbar in 100vh */
        width: min(320px, 85vw);
        background-color: var(--color-white); /* explicit + opaque, not
                                                   relying on inheritance */
        box-shadow: -12px 0 40px rgba(15, 23, 42, 0.18);
        transform: translateX(100%);
        transition: transform var(--transition-base);
        padding: 5rem var(--space-md) var(--space-md);
        overflow-y: auto;
        z-index: 1001;
    }

    #site-navigation.is-open {
        transform: translateX(0);
    }

    /* Dimming backdrop behind the mobile drawer — also masks any
       background bleed-through if a browser mishandles the fixed panel */
    .nav-backdrop {
        display: none;
        position: fixed;
        inset: 0;
        background: rgba(10, 15, 26, 0.5);
        z-index: 1000;
    }

    .nav-backdrop.is-open {
        display: block;
    }

    #site-navigation > ul {
        flex-direction: column;
        align-items: stretch;
        gap: 0;
        width: 100%;
        background-color: var(--color-white);
    }

    #site-navigation > ul > li {
        border-bottom: 1px solid var(--color-light-grey);
        background-color: var(--color-white);
    }

    #site-navigation > ul > li > a,
    #site-navigation > ul > li > button.nav-toggle {
        width: 100%;
        justify-content: space-between;
        padding: 1rem 0.25rem;
    }

    .nav-dropdown {
        position: static;
        transform: none;
        box-shadow: none;
        border: none;
        min-width: 0;
        opacity: 1;
        visibility: visible;
        padding: 0 0 0 0.75rem;
        margin: 0;
        display: grid;
        grid-template-rows: 0fr;
        transition: grid-template-rows var(--transition-base);
        background-color: var(--color-white);
    }

    .nav-dropdown > li:first-child {
        overflow: hidden;
    }

    /* The grid-template-rows technique needs the animated element's
       single row to contain everything, so we wrap visibility in a
       min-height:0 row rather than clipping individual list items —
       this avoids the text-clipping bug max-height/overflow caused
       on iOS Safari when submenu items wrapped to two lines. */
    .nav-dropdown {
        overflow: hidden;
    }

    li.is-open .nav-dropdown {
        grid-template-rows: 1fr;
        padding: 0.25rem 0 0.75rem 0.75rem;
    }

    .nav-dropdown > li:first-child {
        min-height: 0;
    }

    .nav-cta {
        margin-top: var(--space-sm);
        text-align: center;
        justify-content: center;
    }
}