/*
 * Header navigation: the single visual source for the study architecture menu.
 *
 * Desktop (>= 1200px): four sections centred in the bar, the remaining sections under a
 * menu icon at the far inline-end of the header. Each dropdown opens under its item and
 * nested levels fly out beside their parent panel; study-menu.js flips, slides or lifts a
 * panel only when it would leave the viewport. Panels grow with their content (no inner scroll).
 *
 * Below 1200px: the theme hamburger opens .mobile-nav, an accordion of the full tree.
 * Keep the 1200px breakpoint in sync with DESKTOP_QUERY in study-menu.js.
 */

.site-header .header-inner {
    gap: 8px;
    max-width: min(1400px, calc(100% - 28px));
    padding-inline: 14px;
}

.site-header .logo,
.site-header .header-actions {
    flex-shrink: 0;
}

.site-header .logo-text {
    font-size: 1rem;
}

/* ---------- Desktop bar ---------- */

@media (min-width: 1200px) {
    .site-header {
        --menu-green: var(--primary);
        --menu-ink: #0f172a;
        --menu-text: #1e293b;
        --menu-line: #dbe4ee;
        --menu-hover-bg: #ecfdf5;
        --menu-hover-ink: #047857;
        --menu-panel-pad: 12px;
        --menu-flyout-gap: 8px;
        --menu-more-size: 48px;
        --menu-more-gap: 28px;
        --menu-dir: 1;
        height: 88px;
    }

    [dir="rtl"] .site-header {
        --menu-dir: -1;
    }

    /* Equal side columns keep the four sections centred in the header. */
    .site-header .header-inner {
        position: relative;
        display: grid;
        grid-template-columns: minmax(max-content, 1fr) auto minmax(max-content, 1fr);
        align-items: center;
        height: 88px;
        overflow: visible;
    }

    .site-header .logo {
        justify-self: start;
    }

    .site-header .header-actions {
        justify-self: end;
    }

    .site-header:has(.study-menu-more) .header-actions {
        margin-inline-end: calc(var(--menu-more-size) + var(--menu-more-gap));
    }

    .site-header .mobile-toggle,
    .mobile-nav {
        display: none !important;
    }

    .study-architecture-nav {
        position: static;
        display: flex;
        justify-content: center;
        min-width: 0;
        margin: 0;
        overflow: visible;
    }

    .study-architecture-nav .study-architecture-menu {
        position: static;
        display: flex;
        align-items: center;
        flex-wrap: nowrap;
        gap: 4px;
        margin: 0;
        padding: 5px;
        list-style: none;
        background: none;
        box-shadow: none;
    }

    .study-architecture-nav .menu-item {
        position: relative;
        margin: 0;
        padding: 0;
    }

    /* Top-level items */

    .study-architecture-nav .study-architecture-menu > .menu-item > a {
        display: inline-flex;
        align-items: center;
        gap: 9px;
        min-height: 44px;
        padding: 0 16px;
        border-radius: 12px;
        color: var(--menu-text);
        font-size: 15px;
        font-weight: 700;
        line-height: 1.2;
        white-space: nowrap;
        text-decoration: none;
        transition: background-color .16s ease, color .16s ease, box-shadow .16s ease;
    }

    @media (max-width: 1319.98px) {
        .study-architecture-nav .study-architecture-menu > .menu-item:not(.study-menu-more) > a {
            gap: 8px;
            padding: 0 12px;
        }
    }

    .study-architecture-nav .study-architecture-menu > .menu-item > a:hover,
    .study-architecture-nav .study-architecture-menu > .study-menu-open > a,
    .study-architecture-nav .study-architecture-menu > .current-menu-item > a,
    .study-architecture-nav .study-architecture-menu > .current-menu-ancestor > a {
        background: #fff;
        color: #0f5132;
        box-shadow: inset 0 0 0 1px rgba(46, 217, 141, .4), 0 2px 8px rgba(15, 23, 42, .06);
    }

    .study-architecture-nav .study-architecture-menu > .menu-item-has-children:not(.study-menu-more) > a::after {
        content: "";
        flex: none;
        width: 8px;
        height: 8px;
        border-right: 2.5px solid currentColor;
        border-bottom: 2.5px solid currentColor;
        opacity: .7;
        transform: translateY(-2px) rotate(45deg);
        transition: transform .16s ease, opacity .16s ease;
    }

    .study-architecture-nav .study-architecture-menu > .study-menu-open > a::after {
        opacity: 1;
        transform: translateY(2px) rotate(225deg);
    }

    /* Overflow icon: stays inside the <ul>, pinned to the far inline-end of .header-inner. */

    .study-architecture-nav .study-architecture-menu > .study-menu-more {
        position: absolute;
        top: 50%;
        inset-inline-end: 14px;
        margin-top: calc(var(--menu-more-size) / -2);
    }

    .study-architecture-nav .study-architecture-menu > .study-menu-more > a {
        justify-content: center;
        width: var(--menu-more-size);
        height: var(--menu-more-size);
        min-height: 0;
        padding: 0;
        border-radius: 14px;
        color: var(--menu-ink);
        background: #fff;
        box-shadow: inset 0 0 0 1.5px #cbd5e1, 0 1px 3px rgba(15, 23, 42, .08);
    }

    .study-architecture-nav .study-architecture-menu > .study-menu-more > a:hover,
    .study-architecture-nav .study-architecture-menu > .study-menu-more.study-menu-open > a {
        color: var(--menu-hover-ink);
        background: var(--menu-hover-bg);
        box-shadow: inset 0 0 0 1.5px rgba(46, 217, 141, .6), 0 2px 8px rgba(15, 23, 42, .08);
    }

    .study-menu-more__icon {
        display: block;
        width: 26px;
        height: 26px;
    }

    /* Panels */

    .study-architecture-nav .sub-menu {
        --menu-shift: 0px;
        --menu-lift: 0px;
        position: absolute;
        z-index: 1200;
        display: flex;
        flex-direction: column;
        gap: 2px;
        width: 360px;
        max-width: calc(100vw - 24px);
        max-height: none;
        margin: 0;
        padding: var(--menu-panel-pad);
        overflow: visible;
        list-style: none;
        border: 1px solid var(--menu-line);
        border-radius: 14px;
        background: #fff;
        box-shadow: 0 22px 48px rgba(15, 23, 42, .18), 0 2px 6px rgba(15, 23, 42, .06);
        visibility: hidden;
        opacity: 0;
        pointer-events: none;
        transition: opacity .14s ease, visibility 0s linear .14s;
    }

    .study-architecture-nav .study-architecture-menu > .menu-item > .sub-menu {
        top: calc(100% + 14px);
        inset-inline-start: 0;
        width: 400px;
        transform: translateX(var(--menu-shift));
    }

    .study-architecture-nav .study-architecture-menu > .study-menu-more > .sub-menu {
        top: calc(100% + 12px);
        inset-inline-start: auto;
        inset-inline-end: 0;
    }

    /* Invisible bridge over the gap under the trigger keeps the dropdown hovered. */
    .study-architecture-nav .study-architecture-menu > .menu-item > .sub-menu::before {
        content: "";
        position: absolute;
        inset-inline: 0;
        bottom: 100%;
        height: 18px;
    }

    /* Nested panels sit beside their parent panel, first row aligned with the parent row. */
    .study-architecture-nav .sub-menu .sub-menu {
        top: calc(-1px - var(--menu-panel-pad));
        inset-inline-start: calc(100% + var(--menu-panel-pad) + 1px + var(--menu-flyout-gap));
        transform: translate(var(--menu-shift), var(--menu-lift));
    }

    .study-architecture-nav .sub-menu .study-menu-flip > .sub-menu {
        inset-inline-start: auto;
        inset-inline-end: calc(100% + var(--menu-panel-pad) + 1px + var(--menu-flyout-gap));
    }

    /* Bridge back to the parent row so the branch stays open while the pointer crosses the gap. */
    .study-architecture-nav .sub-menu .sub-menu::before {
        content: "";
        position: absolute;
        top: calc(var(--menu-panel-pad) + 1px - var(--menu-lift));
        inset-inline-end: 100%;
        width: calc(var(--menu-panel-pad) + 2px + var(--menu-flyout-gap));
        height: 48px;
    }

    .study-architecture-nav .sub-menu .study-menu-flip > .sub-menu::before {
        inset-inline-end: auto;
        inset-inline-start: 100%;
    }

    /* study-menu.js owns the open state; plain hover/focus is the no-JS fallback. */
    .study-architecture-nav .study-menu-open > .sub-menu,
    html:not(.study-menu-js) .study-architecture-nav .menu-item:hover > .sub-menu,
    html:not(.study-menu-js) .study-architecture-nav .menu-item:focus-within > .sub-menu {
        visibility: visible;
        opacity: 1;
        pointer-events: auto;
        transition-delay: 0s;
    }

    /* Rows */

    .study-architecture-nav .sub-menu > .menu-item > a {
        display: flex;
        align-items: center;
        gap: 12px;
        min-height: 46px;
        padding: 10px 14px;
        border-radius: 10px;
        color: var(--menu-text);
        background: transparent;
        font-size: 15.5px;
        font-weight: 600;
        line-height: 1.45;
        white-space: normal;
        text-decoration: none;
        transition: background-color .14s ease, color .14s ease;
    }

    .study-architecture-nav .study-architecture-menu > .menu-item > .sub-menu > .menu-item > a {
        min-height: 50px;
        color: var(--menu-ink);
        font-size: 16px;
        font-weight: 700;
    }

    .study-architecture-nav .sub-menu > .menu-item > a:hover,
    .study-architecture-nav .sub-menu > .menu-item > a:focus-visible,
    .study-architecture-nav .sub-menu > .study-menu-open > a {
        background: var(--menu-hover-bg);
        color: var(--menu-hover-ink);
    }

    .study-architecture-nav .sub-menu > .current-menu-item > a,
    .study-architecture-nav .sub-menu > .current-menu-ancestor > a {
        color: var(--menu-hover-ink);
    }

    .study-architecture-nav a:not([href]) {
        cursor: default;
    }

    .study-architecture-nav a:focus-visible {
        outline: 2px solid var(--menu-green);
        outline-offset: 2px;
    }

    /* Branch arrow sits on the side its panel opens on and points that way. */
    .study-architecture-nav .sub-menu > .menu-item-has-children > a::after {
        content: "";
        flex: none;
        width: 10px;
        height: 10px;
        margin-inline-start: auto;
        margin-inline-end: 2px;
        border-right: 2.5px solid currentColor;
        border-bottom: 2.5px solid currentColor;
        opacity: .75;
        transform: scaleX(var(--menu-dir)) rotate(-45deg);
    }

    .study-architecture-nav .sub-menu > .study-menu-flip > a::after {
        order: -1;
        margin-inline-start: 2px;
        margin-inline-end: 0;
        transform: scaleX(calc(var(--menu-dir) * -1)) rotate(-45deg);
    }

    .study-architecture-nav .sub-menu > .study-menu-open > a::after {
        opacity: 1;
    }
}

/* ---------- Mobile: theme hamburger + drawer ---------- */

@media (max-width: 1199.98px) {
    .study-architecture-nav,
    .site-header .header-btn {
        display: none !important;
    }

    .site-header .mobile-toggle {
        display: flex !important;
    }

    body.menu-open .mobile-nav {
        display: block !important;
    }
}

.mobile-nav {
    max-height: calc(100vh - 56px);
    max-height: calc(100dvh - 56px);
    overflow-y: auto;
    overscroll-behavior: contain;
}

.mobile-nav .study-architecture-menu,
.mobile-nav .study-architecture-menu .sub-menu {
    list-style: none;
    margin: 0;
    padding: 0;
}

.mobile-nav .study-architecture-menu .menu-item {
    position: relative;
}

.mobile-nav .study-architecture-menu > .menu-item {
    margin-bottom: 8px;
    border: 1px solid #e2e8f0;
    border-radius: 12px;
    background: #fff;
}

.mobile-nav .study-architecture-menu a {
    display: flex;
    align-items: center;
    min-height: 44px;
    padding: 8px 0;
    border-bottom: 0;
    color: #334155;
    font-size: 14.5px;
    font-weight: 600;
    line-height: 1.4;
    white-space: normal;
    text-decoration: none;
}

.mobile-nav .study-architecture-menu > .menu-item > a {
    min-height: 52px;
    padding: 8px 14px;
    color: var(--text);
    font-size: 15.5px;
    font-weight: 800;
}

.mobile-nav .study-architecture-menu .menu-item-has-children > a {
    padding-inline-end: 56px;
}

.mobile-nav .study-architecture-menu .sub-menu {
    margin: 0 14px 10px;
    padding-inline-start: 12px;
    border-inline-start: 2px solid #e2e8f0;
}

.mobile-nav .study-architecture-menu .sub-menu .sub-menu {
    margin: 0 0 6px;
    margin-inline-start: 4px;
}

.mobile-nav.study-mobile-ready .study-architecture-menu .sub-menu {
    display: none;
}

.mobile-nav.study-mobile-ready .study-architecture-menu .is-open > .sub-menu {
    display: block;
}

/* Area and institute lists read better as chips. */
.mobile-nav:not(.study-mobile-ready) .study-architecture-menu .sub-menu:has(> .study-menu-area, > .study-menu-institute),
.mobile-nav.study-mobile-ready .study-architecture-menu .is-open > .sub-menu:has(> .study-menu-area, > .study-menu-institute) {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    padding-block: 4px 8px;
}

.mobile-nav .study-architecture-menu .study-menu-area > a,
.mobile-nav .study-architecture-menu .study-menu-institute > a {
    min-height: 40px;
    padding: 6px 12px;
    border: 1px solid #dbe4ee;
    border-radius: 999px;
    background: #fff;
    font-size: 13.5px;
    line-height: 1.25;
}

.mobile-nav .study-architecture-menu .study-menu-city > a {
    color: #0f5132;
    font-weight: 800;
}

.mobile-nav .study-architecture-menu .current-menu-item > a {
    color: #047857;
    font-weight: 800;
}

.study-mobile-subtoggle {
    position: absolute;
    top: 0;
    inset-inline-end: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    padding: 0;
    border: 1px solid #dbe4ee;
    border-radius: 10px;
    background: #f8fafc;
    color: #475569;
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
}

.mobile-nav .study-architecture-menu > .menu-item > .study-mobile-subtoggle {
    top: 4px;
    inset-inline-end: 6px;
}

.study-mobile-subtoggle::before {
    content: "";
    width: 9px;
    height: 9px;
    border-right: 2.5px solid currentColor;
    border-bottom: 2.5px solid currentColor;
    transform: translateY(-2px) rotate(45deg);
    transition: transform .16s ease;
}

.menu-item.is-open > .study-mobile-subtoggle {
    border-color: rgba(46, 217, 141, .45);
    background: rgba(46, 217, 141, .14);
    color: #0f5132;
}

.menu-item.is-open > .study-mobile-subtoggle::before {
    transform: translateY(2px) rotate(225deg);
}

.study-mobile-subtoggle:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
    .study-architecture-nav .sub-menu,
    .study-architecture-nav a,
    .study-architecture-nav a::after,
    .study-mobile-subtoggle::before {
        transition: none !important;
    }
}