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

.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 999;
    background: transparent;
    color: var(--deep-green);
    transition: box-shadow 0.4s var(--ease), padding 0.4s var(--ease);
    padding: 10px 0;
}

/* Background এখানে আলাদা layer-এ রাখা হয়েছে।
   header-এ সরাসরি backdrop-filter দিলে মোবাইল মেনু
   (position: fixed) হেডারের উচ্চতায় আটকে যায়। */
.site-header::before {
    content: "";

    position: absolute;
    inset: 0;
    z-index: -1;

    background: rgba(243, 239, 230, 0.92);

    pointer-events: none;
}

.site-header.scrolled::before {
    backdrop-filter: blur(10px);
}

.site-header.scrolled {
    box-shadow: 0 1px 0 rgba(18, 24, 26, 0.08);

    padding: 14px 0;
}

.site-header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
}

/* =========================================================
   LOGO
   ========================================================= */

.header-logo {
    display: flex;
    align-items: center;
    flex-shrink: 0;
}

.brand-logo {
    height: 50px;
    width: auto;
    object-fit: contain;
    object-position: center;
}

/* =========================================================
   MAIN NAVIGATION
   ========================================================= */

.main-nav {
    display: flex;
    align-items: center;
    gap: 2px;
}

.main-nav > ul {
    display: flex;
    align-items: center;
    gap: 2px;
}

.main-nav a {
    position: relative;

    display: inline-flex;
    align-items: center;

    font-size: 13.5px;
    font-weight: 500;
    letter-spacing: 0.02em;

    padding: 10px 16px;

    color: var(--deep-green);

    transition: color 0.3s ease;
}

.site-header.on-hero:not(.scrolled) .main-nav a {
    color: var(--deep-green);
}

/* Active underline */

.main-nav > ul > li > a::after {
    content: "";

    position: absolute;
    left: 16px;
    right: 16px;
    bottom: 6px;

    height: 1px;

    background: var(--yallow);

    transform: scaleX(0);
    transform-origin: left;

    transition: transform 0.3s var(--ease);
}

.main-nav > ul > li > a:hover::after,
.main-nav > ul > li > a.active::after {
    transform: scaleX(1);
}

.main-nav > ul > li > a.active {
    color: var(--yallow);
}

.site-header.on-hero:not(.scrolled) .main-nav > ul > li > a.active {
    color: var(--yallow-light);
}

/* =========================================================
   SERVICES DROPDOWN
   ========================================================= */

.main-nav .has-dropdown {
    position: relative;
}

.main-nav .dropdown-toggle {
    display: inline-flex;
    align-items: center;
    gap: 7px;
}

.dropdown-arrow {
    display: inline-flex;
    align-items: center;
    justify-content: center;

    font-size: 16px;
    line-height: 1;

    transition: transform 0.25s ease;
}

.main-nav .dropdown-menu {
    position: absolute;

    top: calc(100% + 8px);
    left: 0;

    min-width: 210px;

    padding: 8px 0;
    margin: 0;

    background: var(--white);

    border-radius: 6px;

    box-shadow: 0 12px 35px rgba(0, 0, 0, 0.12);

    opacity: 0;
    visibility: hidden;

    transform: translateY(8px);

    transition:
        opacity 0.25s ease,
        visibility 0.25s ease,
        transform 0.25s ease;

    z-index: 2000;
}

.main-nav .dropdown-menu li {
    width: 100%;
}

.main-nav .dropdown-menu li a {
    display: block;

    width: 100%;

    padding: 11px 18px;

    color: #222 !important;

    font-size: 14px;
    font-weight: 500;

    white-space: nowrap;

    transition:
        background-color 0.2s ease,
        color 0.2s ease;
}

.main-nav .dropdown-menu li a::after {
    display: none;
}

.main-nav .dropdown-menu li a:hover,
.main-nav .dropdown-menu li a.active {
    color: #fff !important;
    background: var(--deep-green);
}

/* =========================================================
   DESKTOP DROPDOWN
   IMPORTANT:
   Main mobile breakpoint is 860px,
   therefore desktop starts from 861px.
   ========================================================= */

@media (min-width: 861px) {
    .main-nav .has-dropdown:hover > .dropdown-menu,
    .main-nav .has-dropdown:focus-within > .dropdown-menu {
        opacity: 1;
        visibility: visible;
        transform: translateY(0);
    }

    .main-nav .has-dropdown:hover .dropdown-arrow,
    .main-nav .has-dropdown:focus-within .dropdown-arrow {
        transform: rotate(180deg);
    }
}

/* শুধু মোবাইল মেনুতে দেখানো আইটেম (Terms, Privacy, Request a Quote) —
   ডেস্কটপে লুকানো */
.main-nav .nav-cta,
.main-nav .mobile-only {
    display: none;
}

/* =========================================================
   HEADER ACTIONS
   ========================================================= */

.header-actions {
    display: flex;
    align-items: center;
    gap: 18px;
}

.header-actions .btn {
    padding: 8px 10px;
}

/* =========================================================
   MOBILE MENU BUTTON
   ========================================================= */

.nav-toggle {
    display: none;

    flex-direction: column;
    justify-content: center;

    gap: 5px;

    width: 28px;
    height: 28px;

    z-index: 1200;
}

.nav-toggle span {
    display: block;

    width: 100%;
    height: 2px;

    background: var(--deep-green) !important;

    transition:
        transform 0.35s var(--ease),
        opacity 0.35s var(--ease);
}

.nav-toggle.open span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.nav-toggle.open span:nth-child(2) {
    opacity: 0;
}

.nav-toggle.open span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

.nav-toggle.open span {
    background: var(--deep-green) !important;
}

/* =========================================================
   MOBILE HEADER
   ========================================================= */

@media (max-width: 860px) {
    .nav-toggle {
        display: flex;
    }

    .header-actions .btn {
        display: none;
    }

    .main-nav {
        position: fixed;

        inset: 0;

        width: 100%;
        height: 100dvh;

        background: var(--paper);

        z-index: 1100;

        display: flex;
        flex-direction: column;

        justify-content: center;
        align-items: flex-start;

        padding: 90px var(--gutter) 40px;

        overflow-y: auto;

        transform: translateX(100%);

        transition: transform 0.5s var(--ease);
    }

    .main-nav.open {
        transform: translateX(0);
    }

    .main-nav > ul {
        width: 100%;

        display: flex;
        flex-direction: column;

        align-items: flex-start;

        gap: 4px;
    }

    .main-nav > ul > li {
        width: 100%;
    }

    .main-nav a {
        width: 100%;

        display: flex;
        align-items: center;

        font-size: 1.7rem;

        padding: 12px 0;

        color: var(--deep-green) !important;

        font-family: var(--font-display);
    }

    .main-nav > ul > li > a::after {
        display: none;
    }

    /* =========================
       MOBILE ONLY LINKS (Terms, Privacy)
       ========================= */

    .main-nav > ul > li.mobile-only {
        display: block;
    }

    .main-nav > ul > li.mobile-only > a {
        font-family: var(--font-body);
        font-size: 1rem;
        font-weight: 500;

        padding: 8px 0;

        opacity: 0.8;
    }

    /* =========================
       MOBILE REQUEST A QUOTE
       ========================= */

    .main-nav > ul > li.nav-cta {
        display: block;

        margin-top: 24px;
    }

    .main-nav > ul > li.nav-cta > a.btn {
        justify-content: center;

        width: 100%;

        padding: 14px 24px;

        font-family: var(--font-body);
        font-size: 15px;
        font-weight: 600;

        background: var(--deep-green);
        color: #fff !important;

        border-radius: var(--radius);
    }

    /* =========================
       MOBILE SERVICES
       ========================= */

    .main-nav .has-dropdown {
        width: 100%;
    }

    .main-nav .dropdown-toggle {
        width: 100%;

        display: flex;
        align-items: center;
        justify-content: space-between;

        cursor: pointer;

        touch-action: manipulation;
    }

    .main-nav .dropdown-arrow {
        margin-left: auto;

        font-size: 18px;

        transition: transform 0.25s ease;
    }

    .main-nav .dropdown-menu {
        position: static;

        width: 100%;
        min-width: 0;

        padding: 0;
        margin: 0;

        background: transparent;

        border-radius: 0;
        box-shadow: none;

        opacity: 1;
        visibility: visible;

        transform: none;

        max-height: 0;

        overflow: hidden;

        transition: max-height 0.35s ease;
    }

    .main-nav .dropdown-menu li a {
        width: 100%;

        padding: 9px 20px 9px 28px;

        font-family: var(--font-body);

        font-size: 14px;
        font-weight: 500;

        color: var(--deep-green) !important;

        background: transparent !important;
    }

    .main-nav .dropdown-menu li a:hover,
    .main-nav .dropdown-menu li a.active {
        color: var(--deep-green) !important;
        background: rgba(0, 102, 51, 0.06) !important;
    }

    /* OPEN */

    .main-nav .has-dropdown.dropdown-open .dropdown-menu {
        max-height: 500px;
    }

    .main-nav .has-dropdown.dropdown-open .dropdown-arrow {
        transform: rotate(180deg);
    }
}