/* ============================================================
   IIM Bodh Gaya — Header Styles
   File: assets/css/header.css
   Enqueued via functions.php → iimbg_enqueue_scripts()
   ============================================================ */

/* ── Reset ── */
*, *::before, *::after {
    box-sizing: border-box;
}

/* ============================================================
   HEADER BAR
   Phase 1: absolute — floats over hero, no document space taken
   Phase 2: fixed   — slides down after scroll
   ============================================================ */
#site-header {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    /* Responsive height: shrinks on smaller screens */
    height: clamp(64px, 10vw, 100px);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 clamp(12px, 4vw, 56px);
    gap: 10px;
    z-index: 1000;
    box-shadow: none;
    transition: background 0.4s ease, box-shadow 0.4s ease, height 0.3s ease;
}

/* Fixed state — after scroll */
#site-header.hdr-stuck {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: clamp(56px, 8vw, 90px);
    background: linear-gradient(130deg, #FFFF 30%, #101e41 100%);
    box-shadow: 0 4px 28px rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    animation: hdrSlideDown 0.38s cubic-bezier(0.22, 1, 0.36, 1) forwards;
    margin-top: 0;
    border-bottom: 3px solid #efb32f;
}

@keyframes hdrSlideDown {
    from { transform: translateY(-100%); }
    to   { transform: translateY(0); }
}

#site-header.hdr-stuck::after {
    content: '';
    position: absolute;
    bottom: 0; left: 0; right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, #c8a84b 45%, transparent);
    opacity: 0.7;
}

/* Spacer — prevents layout jump when header becomes fixed */
#hdr-spacer {
    display: none;
    height: 66px;
}
#hdr-spacer.visible {
    display: block;
}

/* Inner pages — dark header immediately (no hero) */
body.iimbg-inner #site-header:not(.hdr-stuck) {
    background: linear-gradient(130deg, #fff 30%, #101e41 100%);
    box-shadow: 0 3px 20px rgba(0, 0, 0, 0.4);
}

/* Body padding */
body.iimbg-front { padding-top: 0; }
/* Use clamp so padding always matches actual header height */
body.iimbg-inner { padding-top: clamp(64px, 10vw, 100px); }

/* ============================================================
   LOGO
   ============================================================ */
.iimbg-logo-link {
    display: flex;
    align-items: center;
    text-decoration: none;
    /* Let it shrink freely — flex will handle width */
    flex: 1 1 auto;
    min-width: 0;       /* critical: allows flex child to shrink below content size */
    max-width: 420px;
    overflow: hidden;
    line-height: 0;
}

.iimbg-logo-link .iimbg-logo-img {
    display: block;
    /* Fluid height: fits inside the header with breathing room */
    height: clamp(40px, 8vw, 90px);
    width: auto;
    max-width: 100%;
    object-fit: contain;
    transition: height 0.3s ease, filter 0.3s ease;
}

/* Sticky state — shrink logo further */
#site-header.hdr-stuck .iimbg-logo-link {
    max-width: 300px;
}
#site-header.hdr-stuck .iimbg-logo-link .iimbg-logo-img {
    height: clamp(36px, 6vw, 72px);
}

/* Nav overlay top-bar logo */
.mnav-top .iimbg-logo-link {
    flex: 0 0 auto;
    max-width: clamp(120px, 40vw, 220px);
    height: 44px;
}
.mnav-top .iimbg-logo-link .iimbg-logo-img {
    height: 40px;
    max-height: 40px;
    width: auto;
    max-width: 100%;
}

/* Text fallback (when no logo image set) */
.iimbg-logo-text {
    display: flex;
    flex-direction: column;
    gap: 2px;
    min-width: 0;
}
.iimbg-logo-text .ln {
    font-family: 'Arvo', serif;
    font-size: clamp(0.7rem, 2.5vw, 1rem);
    font-weight: 700;
    color: #c8a84b;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.iimbg-logo-text .lt {
    font-size: clamp(0.48rem, 1.2vw, 0.58rem);
    color: rgba(255, 255, 255, 0.5);
    letter-spacing: 0.1em;
    text-transform: uppercase;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* ============================================================
   HEADER UTILITY ELEMENTS
   ============================================================ */
#primary-navigation {
    display: none;
}

/* Spacer between logo and right-side controls */
.iimbg-hdr-spacer {
    /* flex-shrink:1 so it collapses when space is tight */
    flex: 1 1 0;
    min-width: 0;
    max-width: 40px;    /* cap so hamburger stays right-aligned */
}

/* Apply Now CTA */
.iimbg-hdr-cta {
    display: none;
    align-items: center;
    padding: 7px 14px;
    background: #c8a84b;
    color: #0d1b3e;
    font-weight: 700;
    font-size: clamp(0.65rem, 1.2vw, 0.75rem);
    letter-spacing: 0.07em;
    text-transform: uppercase;
    text-decoration: none;
    border-radius: 4px;
    white-space: nowrap;
    flex-shrink: 0;
    transition: background 0.2s, transform 0.15s;
}
.iimbg-hdr-cta:hover {
    background: #e8c96a;
    transform: translateY(-1px);
}
/* Show CTA only when there's enough room */
@media (min-width: 600px) {
    .iimbg-hdr-cta { display: flex; }
}

/* ============================================================
   HAMBURGER BUTTON
   ============================================================ */
.nav-hamburger {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 5px;
    /* Fixed size — never let it resize or be pushed off-screen */
    width: 44px;
    height: 44px;
    min-width: 44px;    /* critical: prevents flex from squishing it */
    padding: 0;
    background: transparent;
    border: none;
    cursor: pointer;
    border-radius: 8px;
    flex-shrink: 0;
    transition: background 0.2s;
}
.nav-hamburger:hover {
    background: rgba(200, 168, 75, 0.12);
}
.nav-hamburger span {
    display: block;
    width: 22px;
    height: 2px;
    background: #fff;
    border-radius: 2px;
    transform-origin: center;
    transition: transform 0.28s ease, opacity 0.28s ease, width 0.28s ease;
}
.nav-hamburger.is-open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-hamburger.is-open span:nth-child(2) { opacity: 0; width: 0; }
.nav-hamburger.is-open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ============================================================
   PAGE LOADER
   ============================================================ */
.loader-overlay {
    transition: opacity 0.6s ease, visibility 0.6s ease;
}
.loader-overlay.loader-gone {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

/* ============================================================
   NAV OVERLAY — full-screen menu
   ============================================================ */
#iimbg-nav-overlay {
    position: fixed;
    inset: 0;
    z-index: 2000;
    pointer-events: none;
    visibility: hidden;
    background: transparent;
    transition: background 0.35s ease, visibility 0s 0.35s;
}
#iimbg-nav-overlay.is-open {
    pointer-events: auto;
    visibility: visible;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(3px);
    -webkit-backdrop-filter: blur(3px);
    transition: background 0.35s ease, visibility 0s 0s;
}

/* Slide-down panel */
.mnav-panel {
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    height: 100dvh;
    background: rgba(13, 27, 62, 0.97);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    display: flex;
    flex-direction: column;
    transform: translateY(-100%);
    transition: transform 0.42s cubic-bezier(0.22, 1, 0.36, 1);
    overflow: hidden;
}
#iimbg-nav-overlay.is-open .mnav-panel {
    transform: translateY(0);
}
.mnav-panel::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 3px;
    background: linear-gradient(90deg, #c8a84b, #e8c96a 50%, #c8a84b);
    z-index: 2;
}

/* ── Panel top bar ── */
.mnav-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 clamp(16px, 4vw, 48px);
    height: clamp(56px, 9vw, 66px);
    flex-shrink: 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    background: linear-gradient(130deg, #E2E1EA 0%, #101e41 100%);
    gap: 12px;
}

.mnav-close {
    width: 42px;
    height: 42px;
    min-width: 42px;
    border-radius: 50%;
    background: none;
    border: 1px solid rgba(255, 255, 255, 0.22);
    color: #fff;
    font-size: 18px;
    cursor: pointer;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s, border-color 0.2s, color 0.2s;
}
.mnav-close:hover {
    background: #c8a84b;
    border-color: #c8a84b;
    color: #0d1b3e;
}

/* ── Menu body — two-column layout ── */
.mnav-body {
    flex: 1;
    min-height: 0;
    display: flex;
    width: min(950px, 88vw);
    margin: 0 auto;
    overflow: hidden;
}

/* ── LEFT column — top-level nav items ── */
.mnav-list {
    list-style: none;
    margin: 0;
    padding: clamp(16px, 3vw, 48px) clamp(12px, 3vw, 48px);
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 0;
    overflow-y: auto;
    flex: 0 0 auto;
    min-width: 180px;
}

.mnav-li {
    margin: 0;
    padding: 0;
}

.mnav-btn {
    display: flex;
    width: 100%;
    align-items: center;
    justify-content: space-between;
    background: none;
    border: none;
    cursor: pointer;
    font-family: 'Arvo', serif;
    font-size: clamp(1rem, 1.2vw, 2.55rem);
    font-weight: 500;
    color: rgba(255, 255, 255, 0.45);
    padding: 10px 0;
    line-height: 1.3;
    text-decoration: none;
    position: relative;
    transition: color 0.2s, padding-left 0.2s;
    letter-spacing: -0.01em;
    text-align: left;
    border-bottom: 1px solid rgba(255, 255, 255, 0.07);
}
.mnav-li:last-child .mnav-btn {
    border-bottom: none;
}
.mnav-btn::before {
    content: '';
    position: absolute;
    left: -14px;
    top: 50%;
    transform: translateY(-50%);
    width: 5px;
    height: 5px;
    border-radius: 50%;
    background: #c8a84b;
    opacity: 0;
    transition: opacity 0.2s;
}
.mnav-btn:hover,
.mnav-btn.sub-open,
.mnav-btn.is-active {
    color: #fff;
    padding-left: 14px;
}
.mnav-btn:hover::before,
.mnav-btn.sub-open::before,
.mnav-btn.is-active::before {
    opacity: 1;
}

/* Arrow indicator */
.mnav-arrow {
    font-size: 0.78rem;
    color: rgba(255, 255, 255, 0.3);
    transition: transform 0.22s, color 0.2s;
    flex-shrink: 0;
    margin-left: 10px;
    display: none;
}
.mnav-btn.sub-open .mnav-arrow {
    transform: rotate(90deg);
    color: #c8a84b;
}

/* ── Mobile accordion (hidden on desktop) ── */
.mnav-acc {
    display: none;
    flex-direction: column;
    padding: 4px 0 12px 18px;
    border-left: 2px solid rgba(200, 168, 75, 0.3);
    margin-bottom: 4px;
}
.mnav-acc.is-open {
    display: flex;
}
.mnav-acc .sub-link {
    font-size: 0.9rem;
    padding: 7px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    color: rgba(255, 255, 255, 0.6);
    text-decoration: none;
    display: block;
    transition: color 0.18s, padding-left 0.18s;
}
.mnav-acc .sub-link:last-child {
    border-bottom: none;
}
.mnav-acc .sub-link:hover {
    color: #fff;
    padding-left: 8px;
}

/* ── Vertical divider ── */
.mnav-divider {
    width: 1px;
    background: rgba(255, 255, 255, 0.1);
    margin: clamp(16px, 3vw, 48px) 0;
    flex-shrink: 0;
    display: none;
}
.mnav-divider.vis {
    display: block;
}

/* ── RIGHT column — sub-panels (desktop only) ── */
.mnav-sub-area {
    display: none;
    flex-direction: column;
    justify-content: center;
    padding: clamp(16px, 3vw, 48px) clamp(16px, 3vw, 48px);
    overflow-y: auto;
    flex: 1;
    min-width: 0;
}
.mnav-sub-area.vis {
    display: flex;
}

.sub-panel {
    display: none;
    flex-direction: column;
}
.sub-panel.is-vis {
    display: flex;
    animation: subIn 0.2s ease;
}
@keyframes subIn {
    from { opacity: 0; transform: translateX(8px); }
    to   { opacity: 1; transform: none; }
}

/* Sub-panel label */
.sub-label {
    font-size: 1rem;
    font-weight: 800;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: #c8a84b;
    margin-bottom: 14px;
    display: block;
}
.sub-label-link {
    text-decoration: none;
    transition: opacity 0.2s;
}
.sub-label-link:hover {
    opacity: 0.7;
}

/* Sub-panel child links */
.sub-link {
    display: block;
    font-size: clamp(0.82rem, .8vw, 1.5rem);
    font-weight: 400;
    color: rgba(255, 255, 255, 0.55);
    text-decoration: none;
    padding: 9px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.07);
    transition: color 0.18s, padding-left 0.18s;
    position: relative;
}
.sub-link::before {
    content: '';
    position: absolute;
    left: -8px;
    top: 50%;
    transform: translateY(-50%);
    width: 3px;
    height: 3px;
    border-radius: 50%;
    background: #c8a84b;
    opacity: 0;
    transition: opacity 0.18s;
}
.sub-link:first-of-type {
    border-top: 1px solid rgba(255, 255, 255, 0.07);
}
.sub-link:last-child {
    border-bottom: none;
}
.sub-link:hover {
    color: #fff;
    padding-left: 10px;
}
.sub-link:hover::before {
    opacity: 1;
}

/* ============================================================
   RESPONSIVE BREAKPOINTS
   ============================================================ */

/* ── Large tablets and up (769px+) ── */
@media (min-width: 769px) {
    .mnav-btn[data-sub] .mnav-arrow { display: inline-block; }
    .mnav-acc { display: none !important; }
}

/* ── Tablet (481px – 768px) ── */
@media (max-width: 768px) {
    #site-header {
        height: clamp(60px, 12vw, 80px);
        padding: 0 clamp(10px, 3vw, 24px);
        gap: 8px;
    }

    .iimbg-logo-link {
        max-width: calc(100vw - 120px); /* ensure hamburger never gets pushed off */
    }

    .iimbg-logo-link .iimbg-logo-img {
        height: clamp(36px, 9vw, 60px);
    }

    #site-header.hdr-stuck .iimbg-logo-link .iimbg-logo-img {
        height: clamp(32px, 7vw, 52px);
    }

    /* Hide CTA on tablet to save space */
    .iimbg-hdr-cta { display: none; }

    .mnav-body {
        width: 92%;
        flex-direction: column;
        overflow-y: auto;
    }

    .mnav-sub-area,
    .mnav-divider { display: none !important; }

    .mnav-list {
        justify-content: flex-start;
        padding: 16px 4px;
        min-width: 0;
        width: 100%;
    }

    .mnav-btn {
        font-size: clamp(1rem, 5vw, 1.35rem);
    }

    .mnav-btn[data-sub] .mnav-arrow { display: inline-block; }
    .mnav-acc         { display: none; }
    .mnav-acc.is-open { display: flex !important; }
}

/* ── Mobile (max 480px) ── */
@media (max-width: 480px) {
    #site-header {
        height: 60px;
        padding: 0 12px;
        gap: 6px;
    }

    .iimbg-logo-link {
        /* Hard cap so even very wide logos don't touch the hamburger */
        max-width: calc(100vw - 100px);
        flex: 1 1 auto;
    }

    .iimbg-logo-link .iimbg-logo-img {
        height: 38px;
        max-height: 38px;
    }

    #site-header.hdr-stuck {
        height: 56px;
    }

    #site-header.hdr-stuck .iimbg-logo-link .iimbg-logo-img {
        height: 34px;
        max-height: 34px;
    }

    .iimbg-hdr-spacer {
        /* Collapse spacer on tiny screens — logo + hamburger fill the bar */
        flex: 0 0 4px;
        min-width: 0;
        max-width: 4px;
    }

    .iimbg-hdr-cta { display: none; }

    body.iimbg-inner { padding-top: 60px; }

    .nav-hamburger {
        width: 40px;
        height: 40px;
        min-width: 40px;
    }

    .mnav-top {
        height: 56px;
        padding: 0 12px;
    }

    .mnav-top .iimbg-logo-link {
        max-width: calc(100vw - 80px);
    }

    .mnav-top .iimbg-logo-link .iimbg-logo-img {
        height: 34px;
        max-height: 34px;
    }
}

/* ── Very small phones (max 360px) ── */
@media (max-width: 360px) {
    #site-header {
        padding: 0 10px;
        gap: 4px;
    }

    .iimbg-logo-link {
        max-width: calc(100vw - 88px);
    }

    .iimbg-logo-link .iimbg-logo-img {
        height: 32px;
        max-height: 32px;
    }

    #site-header.hdr-stuck .iimbg-logo-link .iimbg-logo-img {
        height: 30px;
        max-height: 30px;
    }
}