/**
 * ==========================================================================
 * KALEEM KHAN MEGA MENU NAVIGATION
 * File: css/mega-menu.css
 * ==========================================================================
 * Quiet Grid theme: White, Charcoal (#0F1115), Indigo Accent (#5B5FEF).
 * Accessible, keyboard-navigable, responsive desktop panel & mobile drawer.
 */

:root {
    --nav-ink: #0F1115;
    --nav-muted: #6B7280;
    --nav-accent: #5B5FEF;
    --nav-accent-subtle: rgba(91, 95, 239, 0.08);
    --nav-accent-border: rgba(91, 95, 239, 0.16);
    --nav-border: #E5E7EB;
    --nav-surface: #F9FAFB;
    --nav-surface-hover: #F3F4F6;
    --nav-shadow: 0 20px 48px -10px rgba(15, 17, 21, 0.12), 0 4px 14px rgba(15, 17, 21, 0.04);
}

/* --------------------------------------------------------------------------
   Header & Base Bar Tweaks
-------------------------------------------------------------------------- */
.header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: #FFFFFF;
    border-bottom: 1px solid var(--nav-border);
    transition: background-color 0.2s ease, box-shadow 0.2s ease;
}

.header.scrolled {
    box-shadow: 0 4px 20px rgba(15, 17, 21, 0.04);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.85rem 1.5rem;
    max-width: 1240px;
    margin: 0 auto;
    position: relative;
}

.header .logo {
    font-family: var(--font-heading, 'Instrument Sans', sans-serif);
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--nav-ink);
    text-decoration: none;
    letter-spacing: -0.02em;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-shrink: 0;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 0.85rem;
    flex-shrink: 0;
}

.header-btn {
    font-size: 0.85rem !important;
    padding: 0.55rem 1.15rem !important;
    font-weight: 600 !important;
    border-radius: 9999px !important;
}

/* --------------------------------------------------------------------------
   Desktop Navigation Bar
-------------------------------------------------------------------------- */
@media (min-width: 901px) {
    .nav {
        display: flex;
        align-items: center;
    }

    .mobile-drawer-header,
    .mobile-drawer-cta,
    .mobile-nav-backdrop {
        display: none !important;
    }

    .nav-list {
        display: flex;
        align-items: center;
        gap: 0.35rem;
        list-style: none;
        margin: 0;
        padding: 0;
    }

    .nav-item {
        position: static; /* Allows mega menus to align to container/header width */
    }

    /* Direct Links & Trigger Buttons */
    .nav-link,
    .nav-dropdown-trigger {
        display: inline-flex;
        align-items: center;
        gap: 0.35rem;
        background: transparent;
        border: none;
        padding: 0.55rem 0.85rem;
        font-family: var(--font-body, 'Public Sans', sans-serif);
        font-size: 0.92rem;
        font-weight: 500;
        color: var(--nav-ink);
        text-decoration: none;
        border-radius: 6px;
        cursor: pointer;
        line-height: 1.2;
        transition: color 0.15s ease, background-color 0.15s ease;
    }

    .nav-link:hover,
    .nav-dropdown-trigger:hover,
    .nav-dropdown-trigger[aria-expanded="true"] {
        color: var(--nav-accent);
        background: var(--nav-accent-subtle);
    }

    .nav-link.is-active {
        color: var(--nav-accent);
        font-weight: 600;
    }

    .nav-chevron {
        transition: transform 0.2s cubic-bezier(0.16, 1, 0.3, 1);
        color: var(--nav-muted);
    }

    .nav-dropdown-trigger:hover .nav-chevron,
    .nav-dropdown-trigger[aria-expanded="true"] .nav-chevron {
        transform: rotate(180deg);
        color: var(--nav-accent);
    }

    /* Visible Keyboard Focus */
    .nav-link:focus-visible,
    .nav-dropdown-trigger:focus-visible,
    .mega-item:focus-visible,
    .mega-feature-card:focus-visible {
        outline: 2px solid var(--nav-accent);
        outline-offset: 2px;
    }

    /* --------------------------------------------------------------------------
       Desktop Mega Menu Panel
    -------------------------------------------------------------------------- */
    .mega-menu-panel {
        position: absolute;
        top: 100%;
        left: 50%;
        transform: translateX(-50%) translateY(8px);
        width: min(1180px, calc(100vw - 48px));
        background: #FFFFFF;
        border: 1px solid var(--nav-border);
        border-radius: 12px;
        box-shadow: var(--nav-shadow);
        padding: 1.75rem 2rem;
        box-sizing: border-box;
        opacity: 0;
        visibility: hidden;
        pointer-events: none;
        transition: opacity 0.18s cubic-bezier(0.16, 1, 0.3, 1),
                    transform 0.18s cubic-bezier(0.16, 1, 0.3, 1),
                    visibility 0.18s;
        z-index: 1050;
    }

    /* Safe hover bridge between trigger and panel */
    .mega-menu-panel::before {
        content: '';
        position: absolute;
        top: -16px;
        left: 0;
        right: 0;
        height: 16px;
    }

    .mega-menu-panel.is-open {
        opacity: 1;
        visibility: visible;
        pointer-events: auto;
        transform: translateX(-50%) translateY(4px);
    }

    /* Panel Grids */
    .mega-grid {
        display: grid;
        gap: 2rem;
    }

    .mega-grid-services {
        grid-template-columns: repeat(4, 1fr) 280px;
    }

    .mega-grid-tools {
        grid-template-columns: 1.4fr 1.1fr 280px;
    }

    .mega-grid-learn {
        grid-template-columns: 1.25fr 1.2fr 1.15fr 270px;
    }

    /* Column Structure */
    .mega-col {
        display: flex;
        flex-direction: column;
        gap: 0.35rem;
    }

    .mega-col-header {
        font-family: var(--font-mono, monospace);
        font-size: 0.7rem;
        font-weight: 600;
        text-transform: uppercase;
        letter-spacing: 0.08em;
        color: var(--nav-muted);
        padding-bottom: 0.5rem;
        margin-bottom: 0.35rem;
        border-bottom: 1px solid var(--nav-border);
        display: flex;
        align-items: center;
        justify-content: space-between;
    }

    .mega-col-header a {
        color: var(--nav-accent);
        text-decoration: none;
        font-size: 0.68rem;
        text-transform: none;
        letter-spacing: normal;
    }

    .mega-col-header a:hover {
        text-decoration: underline;
    }

    /* Mega Link Items */
    .mega-item {
        display: flex;
        align-items: flex-start;
        gap: 0.65rem;
        padding: 0.45rem 0.55rem;
        border-radius: 8px;
        text-decoration: none;
        transition: background-color 0.15s ease, transform 0.15s ease;
    }

    .mega-item:hover {
        background: var(--nav-surface);
        transform: translateX(2px);
    }

    .mega-item-icon {
        width: 30px;
        height: 30px;
        border-radius: 6px;
        background: var(--nav-accent-subtle);
        color: var(--nav-accent);
        border: 1px solid var(--nav-accent-border);
        display: flex;
        align-items: center;
        justify-content: center;
        flex-shrink: 0;
        margin-top: 2px;
        transition: background-color 0.15s ease, color 0.15s ease;
    }

    .mega-item:hover .mega-item-icon {
        background: var(--nav-accent);
        color: #FFFFFF;
    }

    .mega-item-text {
        display: flex;
        flex-direction: column;
        gap: 0.15rem;
        min-width: 0;
    }

    .mega-item-title {
        font-family: var(--font-body, 'Public Sans', sans-serif);
        font-size: 0.88rem;
        font-weight: 600;
        color: var(--nav-ink);
        line-height: 1.25;
    }

    .mega-item:hover .mega-item-title {
        color: var(--nav-accent);
    }

    .mega-item-desc {
        font-family: var(--font-body, 'Public Sans', sans-serif);
        font-size: 0.76rem;
        color: var(--nav-muted);
        line-height: 1.35;
        white-space: normal;
    }

    .mega-bottom-link {
        font-family: var(--font-mono, monospace);
        font-size: 0.78rem;
        font-weight: 600;
        color: var(--nav-accent);
        text-decoration: none;
        display: inline-flex;
        align-items: center;
        gap: 0.35rem;
        padding: 0.45rem 0.55rem;
        margin-top: 0.35rem;
        border-top: 1px dashed var(--nav-border);
        transition: color 0.15s ease;
    }

    .mega-bottom-link:hover {
        text-decoration: underline;
    }

    /* --------------------------------------------------------------------------
       Desktop Featured Cards in Mega Menu
    -------------------------------------------------------------------------- */
    .mega-feature-col {
        display: flex;
        flex-direction: column;
    }

    .mega-feature-card {
        background: var(--nav-surface);
        border: 1px solid var(--nav-border);
        border-radius: 10px;
        padding: 1.15rem;
        display: flex;
        flex-direction: column;
        height: 100%;
        box-sizing: border-box;
        text-decoration: none;
        transition: border-color 0.15s ease, box-shadow 0.15s ease, transform 0.15s ease;
    }

    .mega-feature-card:hover {
        border-color: #D1D5DB;
        box-shadow: 0 8px 24px rgba(15, 17, 21, 0.06);
        transform: translateY(-2px);
    }

    .mega-feature-thumb-wrap {
        border-radius: 6px;
        overflow: hidden;
        border: 1px solid var(--nav-border);
        margin-bottom: 0.85rem;
        background: #0F1115;
        aspect-ratio: 16/9;
    }

    .mega-feature-thumb {
        width: 100%;
        height: 100%;
        object-fit: cover;
        display: block;
    }

    .mega-feature-badge {
        font-family: var(--font-mono, monospace);
        font-size: 0.68rem;
        font-weight: 700;
        text-transform: uppercase;
        letter-spacing: 0.08em;
        color: var(--nav-accent);
        background: #FFFFFF;
        padding: 0.15rem 0.5rem;
        border-radius: 4px;
        border: 1px solid var(--nav-border);
        align-self: flex-start;
        margin-bottom: 0.5rem;
    }

    .mega-feature-title {
        font-family: var(--font-heading, 'Instrument Sans', sans-serif);
        font-size: 1.05rem;
        font-weight: 700;
        color: var(--nav-ink);
        margin: 0 0 0.35rem;
        line-height: 1.25;
    }

    .mega-feature-desc {
        font-size: 0.8rem;
        color: var(--nav-muted);
        line-height: 1.45;
        margin: 0 0 0.85rem;
    }

    .mega-feature-cta {
        margin-top: auto;
        font-family: var(--font-mono, monospace);
        font-size: 0.78rem;
        font-weight: 600;
        color: var(--nav-accent);
        display: inline-flex;
        align-items: center;
        gap: 0.35rem;
    }

    .mega-feature-card:hover .mega-feature-cta {
        text-decoration: underline;
    }
}

/* --------------------------------------------------------------------------
   Mobile Drawer & Accordion Navigation (<= 900px)
-------------------------------------------------------------------------- */
@media (max-width: 900px) {
    body.nav-open {
        overflow: hidden !important;
    }

    .header-btn {
        display: none !important;
    }

    .mobile-toggle {
        display: flex;
        flex-direction: column;
        justify-content: space-around;
        width: 32px;
        height: 24px;
        background: transparent;
        border: none;
        cursor: pointer;
        padding: 0;
        z-index: 1002;
    }

    .mobile-toggle span {
        width: 100%;
        height: 2px;
        background: var(--nav-ink);
        border-radius: 2px;
        transition: transform 0.25s ease, opacity 0.25s ease;
    }

    .mobile-toggle.active span:nth-child(1) {
        transform: translateY(8px) rotate(45deg);
    }

    .mobile-toggle.active span:nth-child(2) {
        opacity: 0;
    }

    .mobile-toggle.active span:nth-child(3) {
        transform: translateY(-8px) rotate(-45deg);
    }

    /* Off-canvas Navigation Drawer */
    .nav {
        position: fixed !important;
        top: 0 !important;
        right: 0 !important;
        bottom: 0 !important;
        left: auto !important;
        width: min(400px, 92vw) !important;
        height: 100% !important;
        height: 100dvh !important;
        background: #FFFFFF !important;
        z-index: 1050 !important;
        display: flex !important;
        flex-direction: column !important;
        justify-content: flex-start !important;
        align-items: stretch !important;
        padding: 0 !important;
        text-align: left !important;
        box-shadow: -10px 0 30px rgba(15, 17, 21, 0.15);
        transform: translateX(100%) !important;
        transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1) !important;
        overflow-y: auto !important;
        -webkit-overflow-scrolling: touch;
    }

    .nav.is-open {
        transform: translateX(0) !important;
    }

    /* Mobile Backdrop */
    .mobile-nav-backdrop {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(15, 17, 21, 0.45);
        backdrop-filter: blur(2px);
        z-index: 1040;
        opacity: 0;
        visibility: hidden;
        transition: opacity 0.25s ease, visibility 0.25s;
    }

    .mobile-nav-backdrop.is-visible {
        opacity: 1;
        visibility: visible;
    }

    /* Drawer Header */
    .mobile-drawer-header {
        display: flex !important;
        align-items: center !important;
        justify-content: space-between !important;
        padding: 1.15rem 1.5rem !important;
        border-bottom: 1px solid var(--nav-border) !important;
        background: #FFFFFF !important;
        position: sticky;
        top: 0;
        z-index: 10;
    }

    .mobile-drawer-logo {
        font-family: var(--font-heading, sans-serif);
        font-weight: 700;
        font-size: 1.15rem;
        color: var(--nav-ink);
        letter-spacing: -0.02em;
    }

    .mobile-drawer-close {
        background: transparent;
        border: none;
        color: var(--nav-muted);
        cursor: pointer;
        padding: 0.4rem;
        border-radius: 6px;
        display: flex;
        align-items: center;
        justify-content: center;
        transition: color 0.15s ease, background-color 0.15s ease;
    }

    .mobile-drawer-close:hover {
        color: var(--nav-ink);
        background: var(--nav-surface);
    }

    /* Drawer List */
    .nav-list {
        list-style: none !important;
        padding: 0.75rem 1.25rem 2.5rem !important;
        margin: 0 !important;
        display: flex !important;
        flex-direction: column !important;
        justify-content: flex-start !important;
        align-items: stretch !important;
        gap: 0.35rem !important;
        width: 100% !important;
        box-sizing: border-box !important;
    }

    .nav-item {
        width: 100% !important;
        border-bottom: 1px solid rgba(229, 231, 235, 0.6) !important;
        padding-bottom: 0.35rem !important;
        text-align: left !important;
    }

    .nav-list > li {
        width: 100% !important;
        text-align: left !important;
    }

    .nav-link {
        display: block !important;
        padding: 0.85rem 0.5rem !important;
        font-size: 1.02rem !important;
        font-weight: 600 !important;
        color: var(--nav-ink) !important;
        text-decoration: none !important;
        text-align: left !important;
    }

    .nav-dropdown-trigger {
        width: 100%;
        display: flex;
        align-items: center;
        justify-content: space-between;
        padding: 0.85rem 0.5rem;
        background: transparent;
        border: none;
        font-family: inherit;
        font-size: 1.05rem;
        font-weight: 600;
        color: var(--nav-ink);
        cursor: pointer;
        text-align: left;
    }

    .nav-dropdown-trigger .nav-chevron {
        transition: transform 0.25s ease;
    }

    .nav-dropdown-trigger[aria-expanded="true"] .nav-chevron {
        transform: rotate(180deg);
        color: var(--nav-accent);
    }

    /* Accordion Panels */
    .mega-menu-panel {
        display: none;
        padding: 0.5rem 0.5rem 1rem;
    }

    .mega-menu-panel.is-open {
        display: block;
    }

    .mega-grid {
        display: flex;
        flex-direction: column;
        gap: 1.25rem;
    }

    .mega-col-header {
        font-family: var(--font-mono, monospace);
        font-size: 0.68rem;
        font-weight: 700;
        text-transform: uppercase;
        letter-spacing: 0.08em;
        color: var(--nav-accent);
        margin-bottom: 0.35rem;
        padding-bottom: 0.25rem;
        border-bottom: 1px dashed var(--nav-border);
    }

    .mega-item {
        display: flex;
        align-items: flex-start;
        gap: 0.75rem;
        padding: 0.65rem 0.4rem;
        text-decoration: none;
        border-radius: 6px;
    }

    .mega-item:active {
        background: var(--nav-surface);
    }

    .mega-item-icon {
        width: 28px;
        height: 28px;
        border-radius: 6px;
        background: var(--nav-accent-subtle);
        color: var(--nav-accent);
        display: flex;
        align-items: center;
        justify-content: center;
        flex-shrink: 0;
    }

    .mega-item-title {
        font-size: 0.92rem;
        font-weight: 600;
        color: var(--nav-ink);
    }

    .mega-item-desc {
        font-size: 0.78rem;
        color: var(--nav-muted);
        line-height: 1.35;
    }

    .mega-bottom-link {
        display: block;
        padding: 0.5rem 0.4rem;
        font-family: var(--font-mono, monospace);
        font-size: 0.8rem;
        font-weight: 600;
        color: var(--nav-accent);
        text-decoration: none;
    }

    /* Mobile Feature Card */
    .mega-feature-col {
        margin-top: 0.5rem;
    }

    .mega-feature-card {
        background: var(--nav-surface);
        border: 1px solid var(--nav-border);
        border-radius: 8px;
        padding: 1rem;
        text-decoration: none;
        display: block;
    }

    .mega-feature-thumb-wrap {
        display: none; /* Hide heavy thumbnail in mobile accordion for compact scrolling */
    }

    .mega-feature-badge {
        font-family: var(--font-mono, monospace);
        font-size: 0.65rem;
        font-weight: 700;
        color: var(--nav-accent);
        margin-bottom: 0.25rem;
        display: inline-block;
    }

    .mega-feature-title {
        font-size: 0.95rem;
        font-weight: 700;
        color: var(--nav-ink);
        margin: 0 0 0.25rem;
    }

    .mega-feature-desc {
        font-size: 0.78rem;
        color: var(--nav-muted);
        margin: 0 0 0.5rem;
    }

    .mega-feature-cta {
        font-family: var(--font-mono, monospace);
        font-size: 0.75rem;
        font-weight: 600;
        color: var(--nav-accent);
    }

    /* Mobile Drawer CTA Button */
    .mobile-drawer-cta {
        margin-top: 1rem;
        border-bottom: none !important;
        padding-top: 0.5rem;
    }
}

/* --------------------------------------------------------------------------
   Accessibility: Reduced Motion
-------------------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
    .mega-menu-panel,
    .nav,
    .mobile-nav-backdrop,
    .nav-chevron,
    .mega-item {
        transition: none !important;
        transform: none !important;
    }
}