/**
 * Bloom AI University - Navigation CSS
 * Extracted from about-anu-raina.html inline styles.
 * Single source of truth for all navigation styles.
 */

body.menu-open {
    overflow: hidden;
}

/* ============================================
   NAVIGATION - MAIN
   ============================================ */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 80px;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    z-index: var(--z-fixed);
    border-bottom: 1px solid var(--light-gray);
    transition: all var(--transition-base);
}

.nav.scrolled {
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
}

.nav-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 100%;
}

/* ============================================
   NAVIGATION - LOGO
   ============================================ */
.nav-logo {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    text-decoration: none;
    flex-shrink: 0;
}

.nav-logo-icon {
    width: 50px;
    height: 50px;
    transition: transform var(--transition-base);
}

.nav-logo:hover .nav-logo-icon {
    transform: scale(1.05);
}

.nav-logo-text {
    display: flex;
    flex-direction: column;
}

.nav-logo-name {
    font-family: var(--font-primary);
    font-size: var(--text-xl);
    font-weight: 600;
    color: var(--navy);
    line-height: 1.1;
}

.nav-logo-tagline {
    font-size: var(--text-xs);
    font-style: italic;
    color: var(--gray);
}

/* ============================================
   NAVIGATION - MAIN MENU
   ============================================ */
.nav-menu {
    display: flex;
    align-items: center;
    gap: var(--space-1);
    list-style: none;
    margin: 0;
    padding: 0;
}

.nav-item {
    position: relative;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-4);
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--navy);
    text-decoration: none;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.nav-link:hover {
    color: var(--purple);
    background-color: var(--off-white);
}

.nav-link.active {
    color: var(--purple);
}

.nav-link-arrow {
    width: 16px;
    height: 16px;
    display: inline-block;
    stroke: currentColor;
    stroke-width: 2;
    fill: none;
    transition: transform var(--transition-fast);
}

.nav-item:hover .nav-link-arrow,
.nav-item.dropdown-open .nav-link-arrow {
    transform: rotate(180deg);
}

/* Override global "img, svg { display: block }" for nav inline SVGs */
.nav svg,
.nav-mobile svg {
    display: inline-block;
}

.dropdown-link-icon svg {
    display: block;
}

/* ============================================
   NAVIGATION - DROPDOWN BASE
   ============================================ */
.nav-dropdown {
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%) translateY(10px);
    min-width: 320px;
    background: var(--white);
    border-radius: var(--radius-xl);
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.15);
    border: 1px solid var(--light-gray);
    padding: var(--space-6);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-fast);
    z-index: var(--z-dropdown);
}

/* Dropdown arrow pointer */
.nav-dropdown::before {
    content: '';
    position: absolute;
    top: -8px;
    left: 50%;
    transform: translateX(-50%);
    border-left: 10px solid transparent;
    border-right: 10px solid transparent;
    border-bottom: 10px solid var(--white);
}

/* Invisible bridge to prevent dropdown closing on mouse movement */
.nav-item::after {
    content: '';
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    height: 20px;
}

.nav-item:hover .nav-dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}

/* ============================================
   NAVIGATION - WIDE DROPDOWN (Learn)
   ============================================ */
.nav-dropdown.dropdown-wide {
    min-width: 580px;
    left: 0;
    transform: translateX(0) translateY(10px);
}

.nav-dropdown.dropdown-wide::before {
    left: 50px;
    transform: none;
}

.nav-item:hover .nav-dropdown.dropdown-wide {
    transform: translateX(0) translateY(0);
}

.dropdown-columns {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-6);
}

.dropdown-column {
    min-width: 0;
}

/* ============================================
   NAVIGATION - DROPDOWN HEADER
   ============================================ */
.dropdown-header {
    padding-bottom: var(--space-4);
    margin-bottom: var(--space-4);
    border-bottom: 1px solid var(--light-gray);
}

.dropdown-title {
    font-family: var(--font-primary);
    font-size: var(--text-lg);
    font-weight: 600;
    color: var(--navy);
    margin-bottom: var(--space-1);
}

.dropdown-subtitle {
    font-size: var(--text-sm);
    color: var(--gray);
    margin-bottom: 0;
}

/* ============================================
   NAVIGATION - DROPDOWN SECTIONS
   ============================================ */
.dropdown-section {
    margin-bottom: var(--space-4);
}

.dropdown-section:last-child {
    margin-bottom: 0;
}

.dropdown-section-title {
    font-size: var(--text-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--gray);
    margin-bottom: var(--space-2);
    padding-left: var(--space-3);
}

/* ============================================
   NAVIGATION - DROPDOWN LINKS
   ============================================ */
.dropdown-link {
    display: flex;
    align-items: flex-start;
    gap: var(--space-3);
    padding: var(--space-3);
    margin: 0 calc(var(--space-3) * -1);
    border-radius: var(--radius-md);
    text-decoration: none;
    transition: all var(--transition-fast);
}

.dropdown-link:hover {
    background-color: var(--off-white);
}

.dropdown-link-icon {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: transform var(--transition-fast);
}

.dropdown-link:hover .dropdown-link-icon {
    transform: scale(1.1);
}

.dropdown-link-icon svg {
    width: 20px;
    height: 20px;
}

/* Icon color variants */
.dropdown-link-icon.icon-emerald {
    background-color: rgba(0, 200, 81, 0.12);
    color: var(--emerald);
}

.dropdown-link-icon.icon-purple {
    background-color: rgba(139, 92, 246, 0.12);
    color: var(--purple);
}

.dropdown-link-icon.icon-orange {
    background-color: rgba(230, 126, 34, 0.12);
    color: var(--orange);
}

.dropdown-link-icon.icon-gold {
    background-color: rgba(255, 215, 0, 0.2);
    color: var(--orange);
}

.dropdown-link-icon.icon-navy {
    background-color: rgba(27, 58, 95, 0.1);
    color: var(--navy);
}

.dropdown-link-content {
    flex: 1;
    min-width: 0;
}

.dropdown-link-title {
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--navy);
    margin-bottom: 2px;
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.dropdown-link-title .badge {
    padding: 2px 8px;
    font-size: 10px;
}

.dropdown-link-desc {
    font-size: var(--text-xs);
    color: var(--gray);
    line-height: 1.4;
    margin-bottom: 0;
}

/* ============================================
   NAVIGATION - DROPDOWN DIVIDER & FOOTER
   ============================================ */
.dropdown-divider {
    height: 1px;
    background-color: var(--light-gray);
    margin: var(--space-4) 0;
}

.dropdown-cta {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3);
    margin: var(--space-4) calc(var(--space-3) * -1) calc(var(--space-3) * -1);
    background: linear-gradient(135deg, rgba(0, 200, 81, 0.06), rgba(139, 92, 246, 0.06));
    border-radius: var(--radius-md);
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--purple);
    text-decoration: none;
    transition: all var(--transition-fast);
}

.dropdown-cta:hover {
    background: linear-gradient(135deg, rgba(0, 200, 81, 0.12), rgba(139, 92, 246, 0.12));
}

.dropdown-cta svg {
    width: 16px;
    height: 16px;
    transition: transform var(--transition-fast);
}

.dropdown-cta:hover svg {
    transform: translateX(4px);
}

/* ============================================
   NAVIGATION - CTA BUTTON
   ============================================ */
.nav-cta {
    margin-left: var(--space-4);
}

.nav-cta .btn {
    padding: var(--space-3) var(--space-6);
    font-size: var(--text-sm);
}

/* ============================================
   NAVIGATION - MOBILE TOGGLE
   ============================================ */
.nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 44px;
    height: 44px;
    padding: 0;
    background: transparent;
    border: none;
    cursor: pointer;
    z-index: calc(var(--z-fixed) + 1);
}

.nav-toggle-bar {
    width: 24px;
    height: 2px;
    background-color: var(--navy);
    border-radius: var(--radius-full);
    transition: all var(--transition-base);
}

.nav-toggle-bar:nth-child(1) {
    margin-bottom: 6px;
}

.nav-toggle-bar:nth-child(3) {
    margin-top: 6px;
}

/* Toggle active state (hamburger to X) */
.nav-toggle.active .nav-toggle-bar:nth-child(1) {
    transform: rotate(45deg) translate(5px, 6px);
}

.nav-toggle.active .nav-toggle-bar:nth-child(2) {
    opacity: 0;
}

.nav-toggle.active .nav-toggle-bar:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -6px);
}

/* ============================================
   NAVIGATION - MOBILE PANEL
   ============================================ */
.nav-mobile {
    position: fixed;
    top: 80px;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--white);
    z-index: var(--z-modal);
    padding: var(--space-6);
    overflow-y: auto;
    transform: translateX(100%);
    transition: transform var(--transition-base);
}

.nav-mobile.active {
    transform: translateX(0);
}

.nav-mobile-section {
    margin-bottom: var(--space-6);
}

.nav-mobile-title {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-3) 0;
    font-weight: 600;
    color: var(--navy);
    border-bottom: 1px solid var(--light-gray);
    cursor: pointer;
}

.nav-mobile-title svg {
    width: 20px;
    height: 20px;
    color: var(--gray);
    transition: transform var(--transition-fast);
}

.nav-mobile-title.active svg {
    transform: rotate(180deg);
}

.nav-mobile-links {
    display: none;
    padding: var(--space-3) 0;
}

.nav-mobile-links.active {
    display: block;
}

.nav-mobile-link {
    display: block;
    padding: var(--space-3) var(--space-4);
    color: var(--dark-gray);
    font-size: var(--text-sm);
    border-radius: var(--radius-md);
    transition: background-color var(--transition-fast);
}

.nav-mobile-link:hover {
    background-color: var(--light-gray);
}

.nav-mobile-cta {
    padding-top: var(--space-6);
    border-top: 1px solid var(--light-gray);
}

.nav-mobile-cta .btn {
    width: 100%;
}

/* ============================================
   RESPONSIVE - TABLET (1024px)
   ============================================ */
@media (max-width: 1024px) {
    .nav {
        height: 70px;
    }

    .nav-container {
        height: 70px;
    }

    .nav-menu {
        display: none;
    }

    .nav-toggle {
        display: flex;
    }

    .nav-item {
        border-bottom: 1px solid var(--light-gray);
    }

    .nav-item::after {
        display: none;
    }

    .nav-link {
        padding: var(--space-4) 0;
        font-size: var(--text-base);
        justify-content: space-between;
        border-radius: 0;
    }

    .nav-link:hover {
        background: transparent;
    }

    /* Mobile Dropdown */
    .nav-dropdown {
        position: static;
        transform: none;
        min-width: auto;
        box-shadow: none;
        border: none;
        border-radius: 0;
        padding: 0 0 var(--space-4) var(--space-4);
        max-height: 0;
        overflow: hidden;
        opacity: 1;
        visibility: visible;
        transition: max-height var(--transition-base);
    }

    .nav-dropdown::before {
        display: none;
    }

    .nav-dropdown.dropdown-wide {
        min-width: auto;
    }

    .nav-item.dropdown-open .nav-dropdown {
        max-height: 1000px;
        padding-top: var(--space-2);
    }

    .dropdown-columns {
        grid-template-columns: 1fr;
        gap: var(--space-4);
    }

    .dropdown-header {
        display: none;
    }

    .nav-item:hover .nav-dropdown {
        transform: none;
    }

    .nav-item:hover .nav-link-arrow {
        transform: none;
    }

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

    .nav-cta {
        display: none;
    }
}

/* ============================================
   RESPONSIVE - MOBILE (768px)
   ============================================ */
@media (max-width: 768px) {
    .nav-logo-icon {
        width: 40px;
        height: 40px;
    }

    .nav-logo-name {
        font-size: var(--text-lg);
    }

    .nav-logo-tagline {
        display: none;
    }
}