/* =====================================================================
   Navigation — header + side drawer
   ---------------------------------------------------------------------
   Header (top bar): logo + hamburger + account icon.
   Drawer: deep-navy editorial side menu with grouped dropdowns.
   ===================================================================== */

/* ---------- Top nav bar ---------- */
nav {
    position: fixed;
    isolation: isolate;
    width: 100%;
    top: 0;
    left: 0;
    right: 0;
    background: var(--primary-color);
    z-index: 5;
}

/* 3-column grid (1fr | auto | 1fr) so the logo's column is the page's
   geometric center regardless of how wide the side items get. */
.main_nav_header {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    align-items: center;
    padding: 1rem;
    width: 100%;
    gap: 0.5rem;
}
.main_nav_header > .nav_menu_btn { justify-self: start; }
.main_nav_header > .ervt_nav_logo { justify-self: center; }
.main_nav_header > .nav_actions { justify-self: end; }

/* Logo */
.ervt_nav_logo {
    /* padding-left removed — the grid now centers the logo geometrically. */
    padding-left: 0;
}
.ervt_nav_logo a img {
    height: 90px;
    max-height: 100px;
    max-width: 180px;
    width: auto;
}
.logo-desktop { display: none; }
.logo-mobile { display: flex; }

/* Hamburger */
.nav_menu_btn {
    font-size: 1.6rem;
    color: var(--text-dark);
    cursor: pointer;
    background: transparent;
    border: 0;
    transition: color 0.25s ease, transform 0.2s ease;
}
.nav_menu_btn:hover { transform: scale(1.06); }

/* Right side: just the account icon now */
.nav_actions {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
}
.nav_icon {
    position: relative;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: transparent;
    border: none;
    color: var(--text-dark);
    cursor: pointer;
    transition: background 0.2s ease, color 0.2s ease, transform 0.2s ease;
    font-size: 1.35rem;
}
.nav_icon:hover {
    color: #fff;
    background: rgba(0, 0, 0, 0.15);
}

/* Top nav "Enquire Now" CTA — sits beside the account icon */
.enquire_btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.55rem 1.1rem;
    border: 1px solid var(--text-dark);
    border-radius: 999px;
    background: transparent;
    color: var(--text-dark);
    text-transform: uppercase;
    letter-spacing: 0.12em;
    font-size: 0.78rem;
    font-weight: 700;
    line-height: 1;
    text-decoration: none;
    transition: background 0.3s ease, color 0.3s ease,
                border-color 0.3s ease, transform 0.2s ease,
                box-shadow 0.3s ease;
    white-space: nowrap;
}
.enquire_btn:hover {
    background: var(--text-dark);
    color: var(--white);
    border-color: transparent;
    transform: translateY(-1px);
    box-shadow: 0 8px 18px rgba(10, 34, 64, 0.22);
}

.hidden { display: none !important; }

/* ---------- Drawer (side nav) ---------- */
/* Mobile-first: slides DOWN from the top. */
.main_nav_links {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    gap: 0;
    padding: 1.25rem 1.75rem 1.5rem;
    background: linear-gradient(180deg, #0a2240 0%, #122d4f 100%);
    transition: transform 0.5s cubic-bezier(0.22, 1, 0.36, 1);
    z-index: -1;
    transform: translateY(-120%);
    list-style: none;
    margin: 0;
    box-shadow: 0 18px 40px rgba(10, 34, 64, 0.35);
    overflow-y: auto;
    max-height: 100vh;
}
.main_nav_links.open { transform: translateY(100%); }

.main_nav_links a,
.main_nav_links .nav_link {
    display: block;
    width: 100%;
    color: rgba(255, 255, 255, 0.88);
    text-decoration: none;
    font-family: 'roasterregular', sans-serif;
    font-weight: 500;
    font-size: 1rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    padding: 0.9rem 0.4rem 0.9rem 1.1rem;
    border: 0;
    background: transparent;
    text-align: left;
    cursor: pointer;
    position: relative;
    transition: color 0.25s ease, padding-left 0.3s ease;
    white-space: nowrap;
}

/* Animated gold accent strip on the left edge */
.main_nav_links a::before,
.main_nav_links .nav_link::before {
    content: "";
    position: absolute;
    left: 0;
    top: 50%;
    width: 2px;
    height: 0;
    background: var(--primary-color);
    transform: translateY(-50%);
    transition: height 0.3s ease, opacity 0.3s ease;
    opacity: 0;
}
.main_nav_links a:hover,
.main_nav_links .nav_link:hover,
.main_nav_links .nav_link[aria-expanded="true"] {
    color: var(--primary-color);
    padding-left: 1.4rem;
}
.main_nav_links a:hover::before,
.main_nav_links .nav_link:hover::before,
.main_nav_links .nav_link[aria-expanded="true"]::before {
    height: 60%;
    opacity: 1;
}

/* Toggle button styling (Facilities, About Us parents) */
.nav_link--toggle {
    display: flex !important;
    align-items: center;
    justify-content: space-between;
}
.nav_chevron {
    font-size: 1.2rem;
    color: var(--primary-color);
    transition: transform 0.3s cubic-bezier(0.22, 1, 0.36, 1);
    margin-left: 0.85rem;
}
.nav_link--toggle[aria-expanded="true"] .nav_chevron {
    transform: rotate(180deg);
}

/* Dropdown panel inside the drawer */
.nav_sub {
    overflow: hidden;
    max-height: 0;
    transition: max-height 0.4s cubic-bezier(0.22, 1, 0.36, 1);
    padding-left: 1.4rem;
}
.nav_sub[hidden] { display: block !important; max-height: 0; }
.nav_sub:not([hidden]) { max-height: 800px; }

.nav_sub ul {
    list-style: none;
    margin: 0;
    padding: 0;
}
.nav_sub a {
    font-size: 0.86rem;
    letter-spacing: 0.08em;
    text-transform: none;
    padding: 0.55rem 0.4rem 0.55rem 0.8rem;
    color: rgba(255, 255, 255, 0.78);
}
.nav_sub a:hover { color: var(--primary-color); padding-left: 1.1rem; }
.nav_sub a::before { display: none; }

.nav_sub_group {
    padding-top: 0.5rem;
    padding-bottom: 0.4rem;
}
.nav_sub_group + .nav_sub_group {
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    margin-top: 0.4rem;
}
.nav_sub_heading {
    display: block;
    font-size: 0.65rem;
    letter-spacing: 0.32em;
    text-transform: uppercase;
    color: var(--primary-color);
    margin-bottom: 0.3rem;
    padding-left: 0.4rem;
    opacity: 0.85;
}

/* Eyebrow header inside the drawer */
.nav_drawer_eyebrow {
    display: flex;
    align-items: center;
    gap: 0.85rem;
    padding: 0.25rem 1.1rem 1.1rem;
    color: rgba(255, 255, 255, 0.55);
    font-size: 0.7rem;
    letter-spacing: 0.4em;
    text-transform: uppercase;
}
.nav_drawer_eyebrow_rule {
    flex: 1;
    height: 1px;
    background: linear-gradient(90deg, rgba(196, 156, 116, 0.5) 0%, transparent 100%);
}

/* Drawer "Enquire Now" CTA — same hierarchy as other links but gold-tinted
   to read as the primary action. Hover fills it like a button. */
.main_nav_links .nav_link--cta {
    color: var(--primary-color) !important;
    margin-top: 0.6rem;
    border: 1px solid rgba(196, 156, 116, 0.55);
    border-radius: 999px;
    text-align: center;
    padding: 0.85rem 1.1rem !important;
    letter-spacing: 0.18em;
    font-weight: 600;
    transition: background 0.3s ease, color 0.3s ease,
                border-color 0.3s ease, transform 0.2s ease,
                box-shadow 0.3s ease, padding-left 0.3s ease;
}
.main_nav_links .nav_link--cta::before { display: none; }
.main_nav_links .nav_link--cta:hover {
    background: var(--primary-color);
    color: var(--white) !important;
    border-color: transparent;
    padding-left: 1.1rem !important;
    transform: translateY(-1px);
    box-shadow: 0 10px 22px rgba(196, 156, 116, 0.32);
}

/* Quiet account links + divider */
.nav_account_divider {
    height: 1px;
    background: linear-gradient(90deg, rgba(196, 156, 116, 0.35) 0%, transparent 100%);
    margin: 0.85rem 0 0.35rem;
    list-style: none;
}
.nav_link--quiet {
    font-size: 0.82rem !important;
    color: rgba(255, 255, 255, 0.6) !important;
    letter-spacing: 0.16em !important;
}
.nav_link--quiet:hover {
    color: var(--primary-color) !important;
}

/* Drawer close button */
.nav_drawer_close { list-style: none; align-self: flex-end; margin-bottom: 0.5rem; }
.drawer_close_btn {
    display: inline-grid;
    place-items: center;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: 1px solid rgba(196, 156, 116, 0.55);
    background: transparent;
    color: rgba(255, 255, 255, 0.85);
    font-size: 1.15rem;
    cursor: pointer;
    transition: background 0.25s ease, color 0.25s ease, transform 0.2s ease, border-color 0.25s ease;
}
.drawer_close_btn:hover {
    background: var(--primary-color);
    color: var(--white);
    border-color: transparent;
    transform: rotate(90deg);
}
.main_nav_links.open .drawer_close_btn { display: inline-grid; }

/* User Modal */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.45);
    z-index: 1600;
    display: none;
}
.modal-overlay.open { display: block; }

.user-modal.hidden { display: none !important; }
.user-modal {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: #fff;
    border: 1px solid rgba(0, 0, 0, 0.15);
    border-radius: 0.6rem;
    box-shadow: 0 18px 60px rgba(0, 0, 0, 0.35);
    z-index: 1700;
    width: min(520px, 94vw);
    padding: 1rem;
}
.user-modal-content { position: relative; }
.user-modal-close {
    position: absolute;
    top: 0.25rem;
    right: 0.25rem;
    background: transparent;
    border: none;
    font-size: 1.4rem;
    color: var(--text-dark);
    cursor: pointer;
}
.user-modal .user-details {
    list-style: none;
    margin: 0.6rem 0 0.9rem;
    display: grid;
    gap: 0.3rem;
}
.user-modal .as-link {
    text-decoration: underline;
    color: #a0805f;
    font-weight: 700;
}

/* =====================================================================
   Desktop (≥1025px) — drawer becomes a sidebar slide-in from the LEFT
   ===================================================================== */
@media (min-width: 1025px) {
    :root {
        --nav-height: var(--nav-height-desktop);
        --nav-height-desktop: 150px;
        --nav-height-desktop-scrolled: 80px;
    }

    nav {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        background: transparent;
        z-index: 100;
        border: 1px solid transparent;
        border-left: none;
        border-right: none;
        border-radius: 0;
        transition: background 0.4s ease, border-color 0.4s ease, box-shadow 0.4s ease;
    }
    body.scrolled-past-hero nav {
        background: rgba(255, 255, 255, 0.92);
        border-color: var(--primary-color);
        box-shadow: 0 4px 18px -6px rgba(0, 0, 0, 0.22);
        backdrop-filter: blur(6px);
        -webkit-backdrop-filter: blur(6px);
    }

    .main_nav_header { position: relative; }

    nav .nav_inner {
        display: flex;
        align-items: center;
        justify-content: space-between;
        max-width: var(--max-width);
        margin: 0 auto;
        width: 100%;
        min-height: var(--nav-height-desktop);
        padding: 0.55rem 1.2rem;
        transition: min-height 0.4s ease, padding 0.4s ease;
    }
    body.scrolled-past-hero nav .nav_inner {
        min-height: var(--nav-height-desktop-scrolled);
        padding: 0.35rem 1.2rem;
    }

    .ervt_nav_logo a img {
        max-height: var(--nav-height-desktop);
        height: auto;
        width: auto;
        transition: max-height 0.4s ease, transform 0.35s ease;
    }
    body.scrolled-past-hero .ervt_nav_logo a img { max-height: var(--nav-height-desktop-scrolled); }

    .nav_icon { color: var(--primary-color); }

    .logo-desktop-white { display: block !important; }
    .logo-desktop-blue { display: none !important; }
    body.scrolled-past-hero .logo-desktop-white { display: none !important; }
    body.scrolled-past-hero .logo-desktop-blue { display: block !important; }
    .logo-desktop { display: flex; }
    .logo-mobile { display: none; }

    .nav_menu_btn {
        display: inline-flex;
        color: var(--primary-color);
    }

    /* Drawer: 340px sidebar that slides in from the left */
    .main_nav_links {
        position: fixed;
        top: 0;
        left: 0;
        width: min(360px, 88vw);
        height: 100vh;
        padding: 1.5rem 1.75rem 2rem;
        background: linear-gradient(180deg, #0a2240 0%, #122d4f 60%, #1a3656 100%);
        transform: translateX(-110%);
        z-index: 200;
        gap: 0;
        align-items: stretch;
        border-right: 1px solid rgba(196, 156, 116, 0.25);
        box-shadow: 0 0 40px rgba(0, 0, 0, 0.3);
    }
    .main_nav_links.open { transform: translateX(0) !important; }

    /* Override colors so they fit the deep-navy drawer at any scroll state */
    .main_nav_links a,
    .main_nav_links .nav_link {
        color: rgba(255, 255, 255, 0.88);
    }
    body.scrolled-past-hero .main_nav_links a,
    body.scrolled-past-hero .main_nav_links .nav_link {
        color: rgba(255, 255, 255, 0.88);
        padding-left: 1.1rem;
    }
    body.scrolled-past-hero .main_nav_links a:hover,
    body.scrolled-past-hero .main_nav_links .nav_link:hover {
        color: var(--primary-color);
        background: transparent;
    }
}