/* Mobile Styles - Complete Redesign */

/* Mobile First Approach - Base mobile styles */
@media (max-width: 768px) {
    /* Reset and Base */
    body {
        padding-top: 60px;
        overflow-x: hidden;
    }
    
    /* Mobile Header */
    header {
        height: 60px;
        box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    }
    
    .navbar {
        padding: 0.75rem 1rem;
        height: 60px;
        display: flex;
        justify-content: space-between;
        align-items: center;
    }
    
    .nav-brand h1 {
        font-size: 1.2rem;
        margin: 0;
    }
    
    /* Hide desktop menu */
    .nav-menu {
        display: none;
    }
    
    /* Mobile Menu Overlay */
    .mobile-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 85%;
        max-width: 320px;
        height: 100vh;
        background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
        transition: right 0.3s ease;
        z-index: 2000;
        overflow-y: auto;
        box-shadow: -5px 0 15px rgba(0,0,0,0.2);
    }
    
    .mobile-menu.active {
        right: 0;
    }
    
    /* Mobile Menu Header */
    .mobile-menu-header {
        padding: 1.5rem;
        border-bottom: 1px solid rgba(255,255,255,0.2);
        display: flex;
        justify-content: space-between;
        align-items: center;
    }
    
    .mobile-menu-header h2 {
        color: white;
        font-size: 1.3rem;
        margin: 0;
    }
    
    .close-menu {
        background: none;
        border: none;
        color: white;
        font-size: 1.5rem;
        cursor: pointer;
        padding: 0.5rem;
        display: flex;
        align-items: center;
        justify-content: center;
    }
    
    /* Mobile Menu Items */
    .mobile-nav-items {
        padding: 1rem 0;
    }
    
    .mobile-nav-item {
        display: block;
        padding: 1rem 1.5rem;
        color: white;
        text-decoration: none;
        font-size: 1.1rem;
        transition: background 0.2s;
        border-left: 3px solid transparent;
    }
    
    .mobile-nav-item:active,
    .mobile-nav-item.active {
        background: rgba(255,255,255,0.1);
        border-left-color: white;
    }
    
    .mobile-nav-item .icon {
        margin-right: 0.75rem;
        font-size: 1.2rem;
        display: inline-block;
        width: 30px;
    }
    
    /* Mobile Hamburger Button */
    .mobile-menu-btn {
        background: none;
        border: none;
        padding: 0.5rem;
        cursor: pointer;
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 4px;
        z-index: 1001;
        position: relative;
    }
    
    .mobile-menu-btn span {
        display: block;
        width: 25px;
        height: 3px;
        background: white;
        border-radius: 2px;
        transition: all 0.3s ease;
    }
    
    .mobile-menu-btn.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }
    
    .mobile-menu-btn.active span:nth-child(2) {
        opacity: 0;
    }
    
    .mobile-menu-btn.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -6px);
    }
    
    /* Mobile Overlay Background */
    .mobile-overlay {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background: rgba(0,0,0,0.5);
        opacity: 0;
        visibility: hidden;
        transition: opacity 0.3s, visibility 0.3s;
        z-index: 1999;
    }
    
    .mobile-overlay.active {
        opacity: 1;
        visibility: visible;
    }
    
    /* Mobile Content Adjustments */
    .container {
        padding: 1rem;
    }
    
    .section-header h2 {
        font-size: 1.5rem;
    }
    
    .section-header p {
        font-size: 0.9rem;
    }
    
    /* Mobile Cards and Grids */
    .main-navigation {
        grid-template-columns: 1fr 1fr;
        gap: 1rem;
        padding: 1rem;
    }
    
    .nav-card {
        padding: 1.5rem 1rem;
    }
    
    .nav-card h3 {
        font-size: 1rem;
    }
    
    .nav-card p {
        font-size: 0.8rem;
    }
    
    .nav-icon {
        font-size: 2rem;
    }
    
    /* Mobile Level Cards */
    .levels-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
        padding: 0 1rem;
    }
    
    .level-card {
        padding: 1.5rem;
    }
    
    /* Mobile Subject Grid */
    .subjects-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .subject-card {
        padding: 1.5rem;
    }
    
    /* Mobile Topics */
    .topics-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .topic-card {
        padding: 1.5rem;
    }
    
    /* Mobile Quiz */
    .quiz-container {
        padding: 1rem;
    }
    
    .quiz-question {
        font-size: 1.1rem;
        padding: 1rem;
    }
    
    .quiz-option {
        padding: 1rem;
        font-size: 0.95rem;
    }
    
    /* Mobile Progress */
    .progress-overview {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .overview-card {
        padding: 1.5rem;
    }
    
    /* Mobile Profile */
    .profile-content {
        grid-template-columns: 1fr;
        gap: 1.5rem;
        padding: 1rem;
    }
    
    .profile-header {
        flex-direction: column;
        text-align: center;
        gap: 1rem;
    }
    
    .profile-avatar {
        width: 80px;
        height: 80px;
    }
    
    /* Mobile Buttons */
    .btn {
        padding: 0.75rem 1.5rem;
        font-size: 0.95rem;
        width: 100%;
    }
    
    .btn-group {
        flex-direction: column;
        gap: 0.75rem;
    }
    
    /* Mobile Stats */
    .quick-stats {
        flex-direction: column;
        gap: 1rem;
        padding: 1rem;
    }
    
    .quick-stat {
        flex: 1;
        width: 100%;
        padding: 1rem;
        text-align: center;
        background: white;
        border-radius: 12px;
        box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    }
    
    /* Mobile Breadcrumb */
    .breadcrumb {
        padding: 0.5rem 1rem;
        font-size: 0.85rem;
        overflow-x: auto;
        white-space: nowrap;
    }
    
    /* Mobile Achievement Grid */
    .achievements-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 0.75rem;
    }
    
    .achievement-card {
        padding: 1rem;
    }
    
    .achievement-icon {
        font-size: 2rem;
    }
    
    .achievement-name {
        font-size: 0.9rem;
    }
    
    .achievement-description {
        font-size: 0.75rem;
    }
    
    /* Mobile Loading */
    .loading-container {
        padding: 3rem 1rem;
    }
    
    /* Hide desktop-only elements */
    .desktop-only {
        display: none !important;
    }
    
    /* Show mobile-only elements */
    .mobile-only {
        display: block !important;
    }
}

/* Extra small devices */
@media (max-width: 480px) {
    .nav-brand h1 {
        font-size: 1rem;
    }
    
    .main-navigation {
        grid-template-columns: 1fr;
    }
    
    .achievements-grid {
        grid-template-columns: 1fr;
    }
    
    .mobile-menu {
        width: 90%;
    }
}

/* Landscape mode adjustments */
@media (max-width: 768px) and (orientation: landscape) {
    body {
        padding-top: 50px;
    }
    
    header {
        height: 50px;
    }
    
    .navbar {
        height: 50px;
        padding: 0.5rem 1rem;
    }
    
    .mobile-menu-header {
        padding: 1rem;
    }
    
    .mobile-nav-item {
        padding: 0.75rem 1.5rem;
    }
    
    .levels-grid,
    .subjects-grid,
    .topics-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* Touch and interaction improvements */
@media (pointer: coarse) {
    /* Larger touch targets for touch devices */
    .btn,
    .mobile-nav-item,
    .nav-card,
    .level-card,
    .subject-card,
    .topic-card,
    .quiz-option {
        min-height: 44px;
    }
    
    /* Remove hover effects on touch devices */
    .btn:hover,
    .nav-card:hover,
    .level-card:hover,
    .subject-card:hover,
    .topic-card:hover {
        transform: none;
    }
}

/* Dark mode support for mobile menu */
@media (prefers-color-scheme: dark) {
    .mobile-menu {
        background: linear-gradient(135deg, #4a5f8e 0%, #5a4a72 100%);
    }
}

/* Animations */
@keyframes slideIn {
    from {
        transform: translateX(100%);
    }
    to {
        transform: translateX(0);
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

.mobile-menu.active {
    animation: slideIn 0.3s ease;
}

.mobile-overlay.active {
    animation: fadeIn 0.3s ease;
}