/* ==========================================================================
   Professional Mega Menu CSS - FIXED VERSION
   ========================================================================== */

:root {
    --primary-blue: #275CA5;
    --dark-blue: #18427C;
    --light-blue: #b7dbff;
    --accent-green: #c2ee57;
    --accent-dark-green: #6ec63d;
    --text-dark: #333333;
    --text-light: #666666;
    --background-white: #ffffff;
    --shadow-light: rgba(0, 0, 0, 0.08);
    --shadow-medium: rgba(0, 0, 0, 0.15);
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --border-radius: 8px;
    --accent-blue: #A1C6E8;
    --accent-dark-blue: #5E9CCF;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Quicksand', sans-serif;
    line-height: 1.6;
    overflow-x: hidden;
}

/* ==========================================================================
   Top Bar Styles
   ========================================================================== */
.topbar {
    background: linear-gradient(135deg, var(--dark-blue) 0%, var(--primary-blue) 100%);
    color: white;
    padding: 10px 0;
    font-size: 14px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.topbar-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.social-links {
    display: flex;
    align-items: center;
    gap: 15px;
}

.social-links span {
    color: #cfe5ff;
    font-weight: 500;
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.social-icon {
    background-color: rgba(255, 255, 255, 0.15);
    color: white !important;
    width: 30px;
    height: 30px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    font-size: 13px;
    transition: all var(--transition-normal);
    text-decoration: none !important;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.social-icon:hover {
    background-color: var(--accent-green);
    color: var(--dark-blue) !important;
    transform: translateY(-2px) scale(1.1);
    border-color: var(--accent-green);
    box-shadow: 0 4px 12px rgba(194, 238, 87, 0.3);
}

.quick-links {
    display: flex;
    align-items: center;
    gap: 20px;
}

.quick-links a {
    color: #e0edff;
    text-decoration: none;
    font-weight: 500;
    font-size: 13px;
    transition: color var(--transition-fast);
    position: relative;
    padding: 6px 10px;
}

.quick-links a:not(.login-btn):hover {
    color: var(--accent-green);
}

.quick-links a:not(.login-btn)::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent-green);
    transition: width var(--transition-normal);
}

.quick-links a:not(.login-btn):hover::after {
    width: 100%;
}

.divider {
    color: rgba(143, 182, 255, 0.5);
    font-weight: 300;
}

.login-btn {
    background: linear-gradient(135deg, var(--accent-blue), #A1C6E8);
    color: var(--dark-blue) !important;
    padding: 8px 24px;
    border-radius: 30px;
    font-weight: 600;
    font-size: 13px;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: all var(--transition-normal);
    text-decoration: none !important;
    border: none;
}

/* ==========================================================================
   Main Header Styles
   ========================================================================== */
.main-header {
    background: var(--primary-blue) !important;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    position: relative;
    z-index: 1000;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.navbar {
    padding: 0;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.navbar-brand {
    padding: 10px 0;
}

.logo {
    width: auto;
    transition: transform var(--transition-normal);
}

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

.mobile-header-wrapper {
    padding: 10px 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
}

.navbar-toggler {
    border: 1px solid rgba(255, 255, 255, 0.3);
    padding: 8px 12px;
    margin-right: 15px;
    background: transparent;
}

.navbar-toggler-icon {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba%28255, 255, 255, 0.8%29' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
    width: 20px;
    height: 20px;
}

.navbar-nav {
    gap: 0;
}

.nav-item {
    position: relative;
}

.nav-link {
    color: white !important;
    font-weight: 600;
    font-size: 15px;
    padding: 20px 18px !important;
    position: relative;
    transition: all var(--transition-normal);
    display: flex;
    align-items: center;
    text-decoration: none !important;
    border-bottom: 3px solid transparent;
}

.nav-link:not(.download-btn):hover {
    color: var(--accent-green) !important;
    background: rgba(255, 255, 255, 0.05);
    border-bottom-color: var(--accent-green);
}

.nav-link.active {
    color: var(--accent-green) !important;
    border-bottom-color: var(--accent-green);
}

.dropdown-icon {
    font-size: 11px;
    margin-left: 5px;
    transition: transform var(--transition-normal);
    opacity: 0.8;
}

/* ==========================================================================
   Mega Menu System - Professional Implementation
   ========================================================================== */
.mega-hover {
    position: static !important;
}

.mega-menu-wrapper {
    position: absolute;
    top: 85%;
    left: 0;
    right: 0;
    z-index: 1100;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: auto;
    transition-delay: 1.5s;
    pointer-events: none;
    width: 100%;
    max-width: 1400px;
    margin: 0 auto;
}

.mega-hover:hover .mega-menu-wrapper,
.mega-menu-wrapper:hover {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
    transition-delay: 0s;
    pointer-events: auto;
}

.mega-hover:hover .dropdown-icon {
    transform: rotate(180deg);
    color: var(--accent-green);
    opacity: 1;
}

.mega-menu {
    background: var(--background-white);
    border-radius: 10px;
    padding: 15px 0;
    position: relative;
    overflow: hidden;
    margin: 0 auto;
    width: 95%;
    max-width: 95%;
}

.mega-menu .container {
    position: relative;
    z-index: 1;
    max-width: 1400px;
    margin: 0 auto;
}

.mega-menu .row {
    display: flex;
    flex-wrap: wrap;
    margin: 0 -15px;
    justify-content: space-around;
}

.mega-menu .col-md-4 {
    flex: 0 0 30.333%;
    max-width: 33.333%;
}

.mega-menu .col-md-3 {
    flex: 0 0 23%;
    max-width: 23%;
}

.mega-menu .col-md-4:last-child,
.mega-menu .col-md-3:last-child {
    border-right: none;
}

.mega-menu h6 {
    color: var(--dark-blue);
    font-weight: 700;
    font-size: 16px;
    margin-bottom: 0px !important;
    padding: 10px;
    position: relative;
    display: flex;
    align-items: center;
    gap: 10px;
}

.mega-menu ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.mega-menu ul li {
    margin-bottom: 8px;
    position: relative;
    transition: transform var(--transition-fast);
}

.mega-menu ul li a {
    color: #0D5CAB;
    text-decoration: none;
    padding: 3px 15px;
    display: block;
    transition: all var(--transition-fast);
    border-radius: 6px;
    font-size: 16px;
    font-weight: 500;
    position: relative;
    z-index: 1;
    font-family: 'Quicksand', Courier, monospace;
}

.mega-menu ul li a:hover {
     color: #0D5CAB;
     text-decoration: underline;
}

.mega-menu-featured {
    background: linear-gradient(135deg, rgba(39, 92, 165, 0.05), rgba(194, 238, 87, 0.05));
    border-radius: var(--border-radius);
    padding: 20px;
    margin-top: 20px;
    border-left: 4px solid var(--accent-green);
}

.mega-menu-featured h6 {
    color: var(--primary-blue);
    margin-bottom: 15px;
    padding-bottom: 0;
}

.mega-menu-featured p {
    color: var(--text-light);
    font-size: 13px;
    margin-bottom: 15px;
}

.mega-menu-featured .btn-featured {
    background: var(--accent-green);
    color: var(--dark-blue);
    border: none;
    padding: 8px 20px;
    border-radius: 30px;
    font-weight: 600;
    font-size: 13px;
    transition: all var(--transition-normal);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.mega-menu-featured .btn-featured:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(194, 238, 87, 0.4);
}

/* ==========================================================================
   Download Button
   ========================================================================== */
.download-btn {
    width: 178px;
    height: 47px;
    background: #c2ee57;
    box-shadow: 0px 2.92px 0px #6ec63d;
    border-radius: 33px;
    font-weight: 700;
    font-size: 20px;
    color: var(--heading-color);
    text-decoration: none;
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 0;
    margin-left: 15px;
    color: var(--primary-blue) !important;
    padding: 12px 28px !important;
    transition: all var(--transition-normal);
    border: none;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-weight: bold !important;
    font-size: 14px !important;
    margin-top: 5px;
}

.download-btn i {
    font-size: 16px;
}

.mobile-download-btn {
    width: 140px;
    height: 40px;
    background: #c2ee57;
    box-shadow: 0px 2px 0px #6ec63d;
    border-radius: 25px;
    font-weight: 700;
    font-size: 16px;
    color: #275CA5 !important;
    text-decoration: none;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 0 15px;
    white-space: nowrap;
    margin-left: 10px;
    transition: all 0.3s ease;
}

/* ==========================================================================
   Animations
   ========================================================================== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.mega-menu .col-md-4,
.mega-menu .col-md-3 {
    animation: fadeInUp 0.4s ease forwards;
    animation-delay: calc(var(--index) * 0.05s);
    opacity: 0;
}

.text-gradient {
    background: linear-gradient(135deg, var(--accent-green), var(--accent-dark-green));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.badge-new {
    background: linear-gradient(135deg, #ff6b6b, #ff4757);
    color: white;
    font-size: 10px;
    padding: 2px 8px;
    border-radius: 12px;
    margin-left: 8px;
    vertical-align: middle;
}

.badge-popular {
    background: linear-gradient(135deg, var(--accent-green), var(--accent-dark-green));
    color: var(--dark-blue);
    font-size: 10px;
    padding: 2px 8px;
    border-radius: 12px;
    margin-left: 8px;
    vertical-align: middle;
    font-weight: bold;
}

.dropdown-toggle::after {
    display: none;
}

.mega-hover > .nav-link {
    position: relative;
}

.read-more-container {
    margin-top: 10px;
    padding-top: 5px;
    border-top: 1px solid #eee;
}

.read-more-btn, .read-less-btn {
    background: none;
    border: none;
    font-size: 12px;
    cursor: pointer;
    padding: 5px 10px;
    border-radius: 4px;
    transition: all 0.3s;
    display: flex;
    align-items: center;
    width: 100%;
    text-align: left;
    color: rgb(24, 66, 124);
    font-weight: 600;
    font-size: 15px;
}

.read-more-btn:hover, .read-less-btn:hover {
    background: #f8f9fa;
    color: #2980b9;
}

.read-more-btn i, .read-less-btn i {
    font-size: 10px;
    transition: transform 0.3s;
}

.topic-item {
    transition: all 0.3s ease;
}

.additional-topic {
    animation: fadeIn 0.5s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-5px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ==========================================================================
   RESPONSIVE BREAKPOINTS - FIXED
   ========================================================================== */

/* Tablet Portrait (768px - 991px) */
@media (min-width: 768px) and (max-width: 991px) {
    .mega-menu-wrapper {
        width: 85vw;
        max-width: 750px;
        left: 50%;
        transform: translateX(-50%) translateY(-10px);
    }
    
    .mega-menu {
        max-width: 100%;
        padding: 20px 0;
    }
    
    .mega-menu .col-md-4,
    .mega-menu .col-md-3 {
        flex: 0 0 50%;
        max-width: 50%;
        padding: 0 20px;
    }
    
    .mega-menu .col-md-4:nth-child(2n),
    .mega-menu .col-md-3:nth-child(2n) {
        border-right: none;
    }
    
    .nav-link {
        padding: 15px 12px !important;
        font-size: 13px;
    }
    
    .download-btn {
        width: 140px;
        height: 40px;
        font-size: 12px !important;
        margin-left: 8px;
    }
    
    .navbar-nav {
        flex-wrap: wrap;
        justify-content: center;
    }
}

/* Mobile Devices (below 768px) - COMPLETE OVERHAUL */
@media (max-width: 767px) {
    .topbar {
        display: none;
    }
    
    .mega-menu-wrapper {
        display: none !important;
    }
    
    .download-btn {
        display: none !important;
    }
    
    .navbar-collapse {
        position: fixed;
        top: 0;
        left: -100%;
        width: 85%;
        height: 100vh;
        background: white;
        z-index: 1050;
        transition: left 0.3s ease;
        overflow-y: auto;
        padding: 20px;
        box-shadow: 5px 0 15px rgba(0, 0, 0, 0.1);
    }
    
    .navbar-collapse.show {
        left: 0;
    }
    
    .navbar-collapse::before {
        content: '';
        position: fixed;
        top: 0;
        right: 0;
        width: 100vw;
        height: 100vh;
        background: rgba(0, 0, 0, 0.5);
        z-index: -1;
        opacity: 0;
        transition: opacity 0.3s ease;
    }
    
    .navbar-collapse.show::before {
        opacity: 1;
    }
    
    .navbar-nav {
        flex-direction: column;
        width: 100%;
        margin-top: 20px;
    }
    
    .nav-item {
        width: 100%;
        border-bottom: 1px solid #eee;
    }
    
    .nav-item:last-child {
        border-bottom: none;
    }
    
    .nav-link {
        color: #333 !important;
        padding: 15px 0 !important;
        font-size: 16px;
        width: 100%;
        border-bottom: none !important;
    }
    
    .dropdown-icon {
        margin-left: auto;
        transform: rotate(-90deg);
    }
    
    .nav-link.dropdown-toggle[aria-expanded="true"] .dropdown-icon {
        transform: rotate(0deg);
    }
    
    .mobile-submenu {
        padding-left: 15px;
        padding-top: 10px;
    }
    
    .mobile-submenu-item {
        padding: 10px 0;
        border-bottom: 1px solid #f0f0f0;
    }
    
    .mobile-submenu-item:last-child {
        border-bottom: none;
    }
    
    .mobile-topics-list {
        padding-left: 15px;
        max-height: 300px;
        overflow-y: auto;
    }
    
    .mobile-topic-item {
        padding: 8px 0;
        font-size: 14px;
    }
    
    .mobile-topic-item a {
        color: #666;
        text-decoration: none;
        display: flex;
        align-items: center;
    }
    
    .mobile-topic-item a:hover {
        color: var(--primary-blue);
    }
    
    .container {
        padding: 0 15px;
    }
    
    .mobile-download-btn {
        width: 100%;
        margin: 20px 0 0 0;
        height: 45px;
        font-size: 14px;
        justify-content: center;
    }
    
    .mobile-close-btn {
        position: absolute;
        top: 20px;
        right: 20px;
        background: none;
        border: none;
        font-size: 24px;
        color: #333;
        cursor: pointer;
    }
}

/* Small Mobile Devices (below 576px) */
@media (max-width: 575px) {
    .navbar-collapse {
        width: 90%;
    }
    
    .mobile-header-wrapper {
        padding: 8px 0;
    }
    
    .nav-link {
        font-size: 15px;
        padding: 12px 0 !important;
    }
    
    .mobile-download-btn {
        height: 40px;
        font-size: 13px;
    }
}

/* Extra Small Mobile Devices (below 375px) */
@media (max-width: 374px) {
    .navbar-collapse {
        width: 95%;
        padding: 15px;
    }
    
    .nav-link {
        font-size: 14px;
    }
    
    .mobile-download-btn {
        font-size: 12px;
    }

    .login-btn {
        font-size: 10px !important;
    }
}

/* Prevent body scroll when mobile menu is open */
body.mobile-menu-open {
    overflow: hidden;
}

/* Mobile menu backdrop */
.mobile-menu-backdrop {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1049;
    backdrop-filter: blur(2px);
}

.mobile-menu-backdrop.show {
    display: block;
}

/* Mobile menu section headers */
.mobile-section-header {
    color: var(--primary-blue);
    font-weight: 600;
    font-size: 18px;
    margin: 20px 0 10px 0;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--accent-green);
}

/* Mobile menu accordion */
.mobile-accordion-item {
    margin-bottom: 10px;
    border-radius: 5px;
    overflow: hidden;
}

.mobile-accordion-header {
    background: #f8f9fa;
    border: none;
    width: 100%;
    text-align: left;
    padding: 15px;
    font-size: 15px;
    font-weight: 600;
    color: #333;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
}

.mobile-accordion-header .accordion-icon {
    transition: transform 0.3s ease;
}

.mobile-accordion-header[aria-expanded="true"] .accordion-icon {
    transform: rotate(180deg);
}

.mobile-accordion-body {
    background: white;
    padding: 10px 15px;
    border-top: 1px solid #eee;
}

/* Mobile search bar */
.mobile-search-bar {
    padding: 15px 0;
    border-bottom: 1px solid #eee;
}

.mobile-search-input {
    width: 100%;
    padding: 10px 15px;
    border: 1px solid #ddd;
    border-radius: 25px;
    font-size: 14px;
    outline: none;
}

.mobile-search-input:focus {
    border-color: var(--primary-blue);
}

/* Mobile user actions */
.mobile-user-actions {
    display: flex;
    gap: 10px;
    padding: 15px 0;
    border-top: 1px solid #eee;
    margin-top: 20px;
}

.mobile-user-btn {
    flex: 1;
    padding: 10px;
    border-radius: 5px;
    border: 1px solid var(--primary-blue);
    background: white;
    color: var(--primary-blue);
    font-weight: 600;
    text-align: center;
    text-decoration: none;
}

.mobile-user-btn.primary {
    background: var(--primary-blue);
    color: white;
}

.subject-col {
    background: #d6e7f36f !important;
    border-radius: 12px;
    padding: 15px;
}

.row.no-gutters {
    margin-right: -15px;
}

/* For Chrome, Edge, Safari */
.topic-list::-webkit-scrollbar {
    width: 6px;
}

.topic-list::-webkit-scrollbar-thumb {
    background-color: #D6E7F3;
    border-radius: 3px;
}

.topic-list::-webkit-scrollbar-track {
    background: #f1f1f1;
}

/* For Firefox */
.topic-list {
    scrollbar-width: thin;
    scrollbar-color: #D6E7F3 #f1f1f1;
}

@media (min-width: 992px) and (max-width: 1200px) {
    .nav-item .download-btn {
        display: none !important;
    }
}

.navbar-toggler:focus{
    box-shadow: none;
}