/* =====================================================
   SUHAS INSTITUTE OF TECHNOLOGY - NAVBAR STYLES
   Professional College Theme: Navy Blue (#0A2540), White (#FFFFFF), Light Gold (#D4AF37)
   ===================================================== */

/* CSS Variables - Updated with new professional theme */
:root {
    --nav-primary: #0A2540;
    --nav-primary-dark: #061829;
    --nav-primary-light: #143a5e;
    --nav-primary-medium: #0d3251;
    --nav-accent: #D4AF37;
    --nav-accent-light: #e5c565;
    --nav-accent-dark: #b8962e;
    --nav-blue: #0077ff;
    --nav-white: #ffffff;
    --nav-text: #333;
    --nav-text-light: #666;
    --nav-shadow: rgba(10, 37, 64, 0.4);
    --nav-shadow-light: rgba(10, 37, 64, 0.25);
    --nav-transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --nav-transition-smooth: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ================= NAVBAR MAIN ================= */
.navbar-main {
    background: linear-gradient(135deg, var(--nav-primary) 0%, var(--nav-primary-light) 50%, var(--nav-primary) 100%);
    position: sticky;
    top: 0;
    z-index: 9999;
    box-shadow: 0 4px 20px var(--nav-shadow);
    border-bottom: 3px solid var(--nav-accent);
    width: 100%;
    backface-visibility: hidden;
}

.nav-main-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    height: 55px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: relative;
}

/* ================= HAMBURGER MENU ================= */
.hamburger {
    display: none;
    flex-direction: column;
    justify-content: space-around;
    width: 28px;
    height: 22px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0;
    z-index: 10001;
    position: relative;
    flex-shrink: 0;
}

.hamburger span {
    width: 100%;
    height: 3px;
    background-color: var(--nav-white);
    border-radius: 2px;
    transition: var(--nav-transition);
    transform-origin: center;
    position: absolute;
    left: 0;
}

.hamburger span:nth-child(1) {
    top: 0;
}

.hamburger span:nth-child(2) {
    top: 50%;
    transform: translateY(-50%);
}

.hamburger span:nth-child(3) {
    bottom: 0;
}

.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 6px);
}

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

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

/* ================= NAV MENU ================= */
.nav-menu {
    display: flex;
    align-items: center;
    list-style: none;
    gap: 4px;
    margin: 0;
    padding: 0;
}

.nav-item {
    position: relative;
    margin: 0;
}

/* Nav Link Base */
.nav-link {
    color: var(--nav-white);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    padding: 10px 16px;
    border-radius: 8px;
    transition: var(--nav-transition);
    display: flex;
    align-items: center;
    gap: 6px;
    white-space: nowrap;
    box-sizing: border-box;
    position: relative;
    cursor: pointer;
    overflow: hidden;
}

/* Professional hover effect with underline animation */
.nav-link::before {
    content: '';
    position: absolute;
    bottom: 6px;
    left: 16px;
    right: 16px;
    height: 2px;
    background: var(--nav-accent);
    transform: scaleX(0);
    transition: transform var(--nav-transition);
    transform-origin: center;
}

.nav-link::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    opacity: 0;
    transition: opacity var(--nav-transition);
}

/* Hover Effects */
.nav-link:hover {
    color: var(--nav-accent);
    background: transparent;
}

.nav-link:hover::before {
    transform: scaleX(1);
}

.nav-link:hover::after {
    opacity: 1;
}

/* Active Link */
.nav-link.active,
.nav-link:active {
    color: var(--nav-accent);
    background: rgba(212, 175, 55, 0.15);
}

.nav-link.active::before,
.nav-link:active::before {
    transform: scaleX(1);
    background: var(--nav-accent);
}

/* Arrow Icon */
.nav-link i.fa-chevron-down {
    font-size: 9px;
    transition: transform 0.3s ease;
}

.has-dropdown:hover .nav-link i.fa-chevron-down {
    transform: rotate(180deg);
}

/* Home Link - Special Style with Gold Theme */
.nav-item:first-child .nav-link {
    background: linear-gradient(135deg, var(--nav-accent), var(--nav-accent-light));
    color: var(--nav-primary);
    font-weight: 700;
    border: none;
}

.nav-item:first-child .nav-link::before {
    display: none;
}

.nav-item:first-child .nav-link::after {
    display: none;
}

.nav-item:first-child .nav-link:hover {
    background: linear-gradient(135deg, var(--nav-accent-light), #f0d78a);
    transform: translateY(-2px);
    color: var(--nav-primary);
    box-shadow: 0 4px 15px rgba(212, 175, 55, 0.4);
}

/* ================= DROPDOWN ================= */
.has-dropdown {
    position: relative;
}

.dropdown-toggle::after {
    content: '\f078';
    font-family: 'Font Awesome 6 Free';
    font-weight: 900;
    font-size: 9px;
    margin-left: 4px;
    transition: transform 0.3s ease;
}

/* Dropdown Menu */
.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 220px;
    background: var(--nav-white);
    border-radius: 12px;
    box-shadow: 0 15px 40px rgba(10, 37, 64, 0.25);
    padding: 10px 0;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 10001;
    margin-top: 10px;
    max-height: 400px;
    overflow-y: auto;
    overflow-x: hidden;
    border: 1px solid rgba(10, 37, 64, 0.08);
}

.dropdown-menu li {
    border-bottom: 1px solid rgba(10, 37, 64, 0.05);
}

.dropdown-menu li:last-child {
    border-bottom: none;
}

.dropdown-menu a {
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--nav-primary);
    text-decoration: none;
    padding: 12px 20px;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.25s ease;
    position: relative;
}

.dropdown-menu a::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    background: var(--nav-accent);
    transform: scaleY(0);
    transition: transform 0.25s ease;
}

.dropdown-menu a:hover {
    background: linear-gradient(135deg, rgba(10, 37, 64, 0.03) 0%, rgba(10, 37, 64, 0.08) 100%);
    color: var(--nav-primary);
    padding-left: 26px;
    padding-right: 16px;
}

.dropdown-menu a:hover::before {
    transform: scaleY(1);
}

.dropdown-menu a i {
    width: 20px;
    text-align: center;
    color: var(--nav-accent);
    font-size: 14px;
    transition: color 0.25s ease;
}

.dropdown-menu a:hover i {
    color: var(--nav-primary);
}

/* Desktop - Hover for dropdown */
@media (min-width: 993px) {
    .has-dropdown:hover .dropdown-menu {
        opacity: 1;
        visibility: visible;
        transform: translateY(0);
    }
    
    .has-dropdown:hover .dropdown-toggle::after {
        transform: rotate(180deg);
    }
}

/* ================= LANGUAGE TOGGLE ================= */
.nav-lang {
    display: flex;
    align-items: center;
    gap: 8px;
    background: rgba(255, 255, 255, 0.1);
    padding: 6px 14px;
    border-radius: 30px;
    cursor: pointer;
    transition: all 0.3s ease;
    flex-shrink: 0;
    border: 1px solid rgba(255, 255, 255, 0.15);
}

.nav-lang:hover {
    background: rgba(255, 255, 255, 0.18);
    border-color: var(--nav-accent);
    box-shadow: 0 0 15px rgba(212, 175, 55, 0.2);
}

.nav-lang .lang-btn {
    color: var(--nav-white);
    font-size: 13px;
    font-weight: 600;
    transition: all 0.3s ease;
    min-width: 35px;
    text-align: center;
}

.lang-btn.inactive {
    opacity: 0.5;
}

/* Professional Toggle Switch */
.lang-switch {
    position: relative;
    width: 48px;
    height: 26px;
    display: inline-block;
}

.lang-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.lang-slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, var(--nav-primary) 0%, var(--nav-primary-light) 100%);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    border-radius: 26px;
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.2);
    border: 1px solid rgba(212, 175, 55, 0.3);
}

.lang-slider:before {
    position: absolute;
    content: "";
    height: 20px;
    width: 20px;
    left: 3px;
    bottom: 2px;
    background: linear-gradient(135deg, var(--nav-accent), var(--nav-accent-light));
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    border-radius: 50%;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.3);
}

/* Toggle checked state - Marathi active */
.lang-switch input:checked + .lang-slider {
    background: linear-gradient(135deg, var(--nav-accent) 0%, var(--nav-accent-light) 100%);
    border-color: var(--nav-primary);
}

.lang-switch input:checked + .lang-slider:before {
    transform: translateX(22px);
    background: linear-gradient(135deg, var(--nav-primary) 0%, var(--nav-primary-light) 100%);
}

/* Focus state for accessibility */
.lang-switch input:focus + .lang-slider {
    box-shadow: 0 0 0 3px rgba(212, 175, 55, 0.3);
}

/* ================= MOBILE NAV OVERLAY ================= */
.nav-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(10, 37, 64, 0.6);
    backdrop-filter: blur(4px);
    z-index: 999;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.nav-overlay.active {
    display: block;
    opacity: 1;
}

/* Body scroll lock */
body.nav-open {
    overflow: hidden;
}

/* ================= RESPONSIVE - TABLET & MOBILE ================= */
@media (max-width: 992px) {
    /* Show hamburger */
    .hamburger {
        display: flex;
        order: 1;
        flex-shrink: 0;
    }

    /* Keep close (X) fixed at top-right when menu is open */
    .hamburger.active {
        position: fixed;
        top: 16px;
        right: 16px;
        left: auto;
        z-index: 10002;
    }
    
    /* Language toggle positioning */
    .nav-lang {
        order: 2;
        margin-left: auto;
        margin-right: 10px;
        flex-shrink: 0;
    }
    
    /* Mobile Menu Container */
    .nav-menu {
        display: none;
        width: 300px;
        max-width: 85%;
        background: linear-gradient(180deg, var(--nav-primary) 0%, var(--nav-primary-dark) 100%);
        flex-direction: column;
        align-items: stretch;
        box-shadow: 0 15px 40px rgba(0, 0, 0, 0.5);
        margin: 0;
        padding: 0;
        position: fixed;
        top: 55px;
        left: 0;
        height: calc(100vh - 55px);
        max-height: calc(100vh - 55px);
        overflow-y: auto;
        transform: translateX(-100%);
        transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
        z-index: 10000;
        border-right: 1px solid rgba(255, 255, 255, 0.1);
    }
    
    .nav-menu.active {
        display: flex;
        transform: translateX(0);
    }
    
    /* Nav Items */
    .nav-item {
        width: 100%;
        border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        margin: 0;
    }
    
    /* Nav Links */
    .nav-link {
        width: 100%;
        padding: 18px 24px;
        justify-content: space-between;
        font-size: 15px;
        box-sizing: border-box;
        transition: all 0.3s ease;
    }
    
    .nav-link::before {
        display: none;
    }
    
    .nav-link::after {
        display: none;
    }
    
    .nav-link:hover {
        background: rgba(212, 175, 55, 0.15);
        padding-left: 30px;
        color: var(--nav-accent);
    }
    
    .nav-link.active {
        background: rgba(212, 175, 55, 0.2);
        color: var(--nav-accent);
    }
    
    /* Mobile Dropdown - Click to Toggle */
    .dropdown-menu {
        position: static;
        transform: none !important;
        background: rgba(6, 24, 41, 0.95);
        max-height: 0;
        overflow: hidden;
        opacity: 1;
        visibility: visible;
        box-shadow: none;
        border-radius: 0;
        margin: 0;
        width: 100%;
        transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1);
        border-top: 1px solid rgba(255, 255, 255, 0.05);
    }
    
    .has-dropdown.active .dropdown-menu {
        max-height: 600px;
        overflow-y: auto;
    }
    
    .dropdown-menu li {
        border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    }
    
    .dropdown-menu a {
        color: var(--nav-white);
        padding: 16px 30px 16px 45px;
        box-sizing: border-box;
        font-size: 14px;
        transition: all 0.3s ease;
    }
    
    .dropdown-menu a::before {
        display: none;
    }
    
    .dropdown-menu a i {
        color: var(--nav-accent);
    }
    
    .dropdown-menu a:hover {
        background: rgba(212, 175, 55, 0.15);
        padding-left: 52px;
        color: var(--nav-accent);
    }
    
    .dropdown-menu a:hover i {
        color: var(--nav-accent);
    }
    
    /* Dropdown Arrow */
    .dropdown-toggle::after {
        content: '\f054';
        font-size: 12px;
        transition: transform 0.3s ease;
    }
    
    .has-dropdown.active .dropdown-toggle::after {
        transform: rotate(90deg);
    }
    
    /* Home Link Mobile */
    .nav-item:first-child .nav-link {
        background: linear-gradient(135deg, var(--nav-accent), var(--nav-accent-light));
        color: var(--nav-primary) !important;
    }
    
    .nav-item:first-child .nav-link:hover {
        background: linear-gradient(135deg, var(--nav-accent-light), #f0d78a);
        color: var(--nav-primary) !important;
    }
    
    .nav-main-container {
        padding: 0 15px;
    }
    
    /* Dropdown arrow touch target */
    .dropdown-toggle {
        padding-right: 30px !important;
    }
}

/* ================= SMALL MOBILE ================= */
@media (max-width: 576px) {
    .nav-link {
        font-size: 14px;
        padding: 16px 20px;
    }
    
    .nav-link:hover {
        padding-left: 26px;
    }
    
    .nav-lang {
        padding: 5px 10px;
        gap: 6px;
    }
    
    .nav-lang .lang-btn {
        font-size: 12px;
        min-width: 28px;
    }
    
    .lang-switch {
        width: 42px;
        height: 22px;
    }
    
    .lang-slider:before {
        height: 16px;
        width: 16px;
    }
    
    .lang-switch input:checked + .lang-slider:before {
        transform: translateX(20px);
    }
    
    .dropdown-menu a {
        padding: 14px 28px 14px 42px;
        font-size: 13px;
    }
    
    .dropdown-menu a:hover {
        padding-left: 48px;
    }
    
    /* Smaller hamburger for small screens */
    .hamburger {
        width: 26px;
        height: 22px;
    }
    
    .nav-menu {
        width: 85%;
        max-width: 320px;
    }
}

/* ================= ACCESSIBILITY ================= */
@media (prefers-reduced-motion: reduce) {
    .nav-link,
    .dropdown-menu,
    .hamburger span,
    .lang-slider,
    .lang-slider:before,
    .nav-menu {
        transition: none !important;
        animation: none !important;
    }
}

/* Focus visible for keyboard navigation */
.nav-link:focus-visible,
.hamburger:focus-visible,
.dropdown-menu a:focus-visible {
    outline: 2px solid var(--nav-accent);
    outline-offset: 2px;
}

/* ================= BOOTSTRAP OVERRIDE ================= */
/* Prevent Bootstrap from controlling navbar dropdowns */
.navbar-main .dropdown, 
.navbar-main .dropup, 
.navbar-main .dropend, 
.navbar-main .dropstart { 
    position: relative; 
}

.navbar-main .dropdown-toggle::after { 
    display: inline-block !important; 
}

.navbar-main .dropdown-menu { 
    display: block !important;
}

.navbar-main .dropdown-item { 
    display: flex !important; 
}