/**
 * MOBILE RESPONSIVE SYSTEM - Sri Dutta Sai Manga Bharadwaja Trust
 * Comprehensive mobile optimization for all pages
 * 
 * @version 1.0.0
 * @priority HIGH - Mobile usability improvements
 */

/* =================================================================
   MOBILE NAVIGATION ENHANCEMENTS
   ================================================================= */

@media (max-width: 768px) {
    /* Header improvements */
    .header {
        position: sticky;
        top: 0;
        z-index: 1020;
        background: var(--color-surface);
        border-bottom: 1px solid var(--color-border);
        padding: 0.75rem 0;
    }
    
    .nav-container {
        padding: 0 1rem;
        display: flex;
        justify-content: space-between;
        align-items: center;
        position: relative;
    }
    
    .nav-logo {
        display: flex;
        align-items: center;
        gap: 0.5rem;
        z-index: 1021;
    }
    
    .logo-img {
        width: 35px;
        height: 35px;
        border-radius: 50%;
    }
    
    .logo-text {
        font-size: 0.9rem;
        font-weight: 700;
        color: var(--color-primary);
        line-height: 1.2;
        max-width: 150px;
        display: -webkit-box;
        -webkit-line-clamp: 2;
        -webkit-box-orient: vertical;
        overflow: hidden;
    }
    
    /* Mobile menu */
    .nav-menu {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: var(--color-surface);
        flex-direction: column;
        justify-content: flex-start;
        align-items: stretch;
        padding: 100px 2rem 2rem;
        gap: 1.5rem;
        transform: translateX(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all 0.3s ease;
        z-index: 1010;
        overflow-y: auto;
    }
    
    .nav-menu.active {
        transform: translateX(0);
        opacity: 1;
        visibility: visible;
    }
    
    .nav-link {
        display: block;
        padding: 1rem 0;
        font-size: 1.1rem;
        font-weight: 500;
        color: var(--color-text);
        text-decoration: none;
        border-bottom: 1px solid var(--color-border);
        transition: all 0.3s ease;
    }
    
    .nav-link:hover,
    .nav-link.active {
        color: var(--color-primary);
        padding-left: 1rem;
    }
    
    .nav-actions {
        margin-left: 0;
        flex-direction: column;
        width: 100%;
        gap: 1rem;
        margin-top: 1rem;
        border-top: 1px solid var(--color-border);
        padding-top: 1.5rem;
    }
    
    .nav-actions .btn {
        width: 100%;
        text-align: center;
        justify-content: center;
        padding: 1rem;
        font-size: 1.1rem;
        min-height: 50px;
        border-radius: 8px;
    }
    
    /* Hamburger menu */
    .hamburger {
        display: flex;
        flex-direction: column;
        justify-content: center;
        width: 30px;
        height: 30px;
        background: none;
        border: none;
        cursor: pointer;
        padding: 0;
        z-index: 1021;
    }
    
    .hamburger span {
        width: 100%;
        height: 3px;
        background: var(--color-text);
        margin: 3px 0;
        transition: all 0.3s ease;
        border-radius: 2px;
    }
    
    .hamburger.active span:nth-child(1) {
        transform: rotate(45deg) translate(6px, 6px);
    }
    
    .hamburger.active span:nth-child(2) {
        opacity: 0;
    }
    
    .hamburger.active span:nth-child(3) {
        transform: rotate(-45deg) translate(6px, -6px);
    }
}

/* =================================================================
   MOBILE FORM IMPROVEMENTS
   ================================================================= */

@media (max-width: 768px) {
    .form-row {
        display: block;
    }
    
    .form-row .form-group {
        margin-bottom: 1.5rem;
    }
    
    .form-group input,
    .form-group select,
    .form-group textarea {
        font-size: 16px; /* Prevent zoom on iOS */
        padding: 0.875rem 1rem;
        min-height: 50px;
    }
    
    .input-group input,
    .input-group select {
        padding-left: 3rem; /* Space for icons */
    }
    
    .btn {
        padding: 0.875rem 1.5rem;
        font-size: 1rem;
        min-height: 50px;
        border-radius: 8px;
    }
    
    .btn-large {
        padding: 1.125rem 2rem;
        font-size: 1.1rem;
        min-height: 56px;
    }
    
    /* Donation form improvements */
    .causes-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .amounts-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1rem;
    }
    
    .cause-btn,
    .amount-btn {
        padding: 1rem;
        font-size: 1rem;
        min-height: 60px;
    }
    
    /* Summary improvements */
    .donation-summary {
        position: static;
        margin-top: 2rem;
        width: 100%;
    }
    
    .recent-donations {
        margin-top: 2rem;
    }
}

/* =================================================================
   DASHBOARD MOBILE IMPROVEMENTS
   ================================================================= */

@media (max-width: 768px) {
    .dashboard-container {
        display: block;
    }
    
    .sidebar {
        position: fixed;
        top: 0;
        left: -300px;
        bottom: 0;
        width: 300px;
        z-index: 1030;
        transition: transform 0.3s ease;
        transform: translateX(-100%);
    }
    
    .sidebar.mobile-open {
        transform: translateX(0);
    }
    
    .sidebar-overlay {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(0, 0, 0, 0.5);
        z-index: 1025;
    }
    
    .main-content {
        padding: 1rem;
    }
    
    .top-bar {
        flex-direction: column;
        gap: 1rem;
        padding: 1rem;
        background: var(--color-surface);
        border-radius: 8px;
        margin-bottom: 1rem;
    }
    
    .top-bar-left,
    .top-bar-right {
        width: 100%;
    }
    
    .search-box {
        width: 100%;
    }
    
    .search-input {
        width: 100%;
        padding: 0.75rem 3rem 0.75rem 1rem;
        font-size: 16px;
    }
    
    /* Stats grid mobile */
    .stats-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .dashboard-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    /* Table improvements */
    .table-container {
        overflow-x: auto;
        margin: 0 -1rem;
        padding: 0 1rem;
    }
    
    .data-table {
        min-width: 700px;
        font-size: 0.875rem;
    }
    
    .data-table th,
    .data-table td {
        padding: 0.75rem 0.5rem;
        white-space: nowrap;
    }
    
    .action-buttons {
        flex-direction: column;
        gap: 0.25rem;
    }
    
    .action-buttons .btn {
        width: 100%;
        justify-content: center;
        font-size: 0.75rem;
        padding: 0.375rem 0.5rem;
    }
    
    /* Filter section mobile */
    .filters {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .filters-section {
        margin: 0 -1rem 1rem;
        padding: 1rem;
        border-radius: 0;
        border-left: none;
        border-right: none;
    }
}

/* =================================================================
   AUTHENTICATION PAGE MOBILE
   ================================================================= */

@media (max-width: 768px) {
    .auth-container {
        display: block;
    }
    
    .auth-info-section {
        min-height: 40vh;
        order: -1;
    }
    
    .auth-form-section {
        padding: 1.5rem;
    }
    
    .auth-header {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
    
    .auth-tabs {
        margin-bottom: 1.5rem;
    }
    
    .tab-btn {
        padding: 0.875rem 1rem;
        font-size: 1rem;
    }
    
    .form-header h1 {
        font-size: 1.75rem;
    }
    
    .account-info {
        margin-top: 2rem;
    }
    
    .account-types {
        gap: 1rem;
    }
    
    .account-type {
        padding: 1rem;
        border-radius: 8px;
        background: var(--color-secondary);
        display: flex;
        align-items: center;
        gap: 1rem;
    }
}

/* =================================================================
   SMALL MOBILE DEVICES (< 480px)
   ================================================================= */

@media (max-width: 480px) {
    .container {
        padding: 0 1rem;
    }
    
    .logo-text {
        font-size: 0.8rem;
        max-width: 120px;
    }
    
    .logo-img {
        width: 30px;
        height: 30px;
    }
    
    /* Hero section mobile */
    .hero-carousel {
        height: 60vh;
        min-height: 400px;
    }
    
    .slide-title {
        font-size: 1.75rem;
        line-height: 1.2;
    }
    
    .slide-description {
        font-size: 1rem;
        margin: 1rem 0 1.5rem;
    }
    
    .slide-actions {
        flex-direction: column;
        gap: 1rem;
        width: 100%;
    }
    
    .slide-actions .btn {
        width: 100%;
        justify-content: center;
    }
    
    /* Service cards mobile */
    .services-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .service-card {
        padding: 1.5rem;
    }
    
    /* Project cards mobile */
    .projects-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    /* Events mobile */
    .events-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .event-card {
        flex-direction: column;
        text-align: center;
        padding: 1.5rem;
    }
    
    .event-date {
        margin-bottom: 1rem;
    }
    
    /* Footer mobile */
    .footer-content {
        grid-template-columns: 1fr;
        gap: 2rem;
        text-align: center;
    }
    
    .footer-bottom-content {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
    
    /* Forms extra small */
    .auth-form-section {
        padding: 1rem;
    }
    
    .form-group {
        margin-bottom: 1.25rem;
    }
    
    .input-group input,
    .input-group select {
        padding: 0.75rem 1rem;
        padding-left: 2.75rem;
    }
    
    .amounts-grid {
        grid-template-columns: 1fr;
    }
    
    .amount-btn {
        padding: 1.125rem;
        font-size: 1.125rem;
    }
    
    /* Dashboard mobile extra small */
    .sidebar {
        width: 280px;
    }
    
    .sidebar-logo .logo-text {
        font-size: 0.8rem;
        line-height: 1.1;
    }
    
    .nav-menu {
        padding: 0.5rem;
    }
    
    .nav-link {
        padding: 0.875rem;
        font-size: 0.95rem;
    }
    
    .top-bar {
        padding: 0.75rem;
    }
    
    .search-input {
        padding: 0.625rem 2.5rem 0.625rem 0.875rem;
        font-size: 14px;
    }
    
    .data-table {
        font-size: 0.8rem;
    }
    
    .data-table th,
    .data-table td {
        padding: 0.5rem 0.25rem;
    }
}

/* =================================================================
   TOUCH-FRIENDLY IMPROVEMENTS
   ================================================================= */

@media (max-width: 768px) {
    /* Minimum touch target sizes */
    .btn,
    .nav-link,
    .tab-btn,
    .quick-action-btn,
    .cause-btn,
    .amount-btn,
    input[type="submit"],
    input[type="button"],
    button {
        min-height: 44px;
        min-width: 44px;
    }
    
    /* Larger tap areas for small elements */
    .password-toggle,
    .notification-close,
    .modal-close,
    .carousel-btn {
        min-width: 44px;
        min-height: 44px;
        display: flex;
        align-items: center;
        justify-content: center;
    }
    
    /* Improved checkbox/radio targets */
    .checkbox-label,
    .radio-label {
        min-height: 44px;
        display: flex;
        align-items: center;
        gap: 0.75rem;
        cursor: pointer;
        padding: 0.5rem;
    }
    
    .checkmark {
        min-width: 20px;
        min-height: 20px;
    }
    
    /* Carousel improvements */
    .carousel-btn {
        width: 50px;
        height: 50px;
        font-size: 1.2rem;
    }
    
    .carousel-indicators {
        gap: 1rem;
    }
    
    .indicator {
        width: 12px;
        height: 12px;
        min-width: 44px;
        min-height: 44px;
        display: flex;
        align-items: center;
        justify-content: center;
    }
    
    .indicator:before {
        content: '';
        width: 12px;
        height: 12px;
        border-radius: 50%;
        background: currentColor;
    }
}

/* =================================================================
   LANDSCAPE ORIENTATION FIXES
   ================================================================= */

@media (max-width: 768px) and (orientation: landscape) {
    .hero-carousel {
        height: 85vh;
    }
    
    .slide-content {
        padding: 2rem 0;
    }
    
    .slide-title {
        font-size: 1.5rem;
    }
    
    .slide-description {
        font-size: 0.95rem;
        margin: 0.75rem 0 1rem;
    }
    
    .slide-actions {
        flex-direction: row;
        gap: 1rem;
    }
}

/* =================================================================
   PERFORMANCE OPTIMIZATIONS
   ================================================================= */

@media (max-width: 768px) {
    /* Reduce animations on mobile for better performance */
    @media (prefers-reduced-motion: no-preference) {
        .nav-menu {
            transition: transform 0.25s ease, opacity 0.25s ease;
        }
        
        .tab-content {
            transition: opacity 0.2s ease, transform 0.2s ease;
        }
        
        .btn {
            transition: all 0.2s ease;
        }
    }
    
    /* Hide non-essential animations on slow connections */
    @media (prefers-reduced-data: reduce) {
        * {
            animation: none !important;
            transition: none !important;
        }
    }
}

/* =================================================================
   ACCESSIBILITY IMPROVEMENTS FOR MOBILE
   ================================================================= */

@media (max-width: 768px) {
    /* Focus improvements */
    *:focus-visible {
        outline: 3px solid var(--color-primary);
        outline-offset: 2px;
    }
    
    /* Skip links for keyboard navigation */
    .skip-links {
        position: absolute;
        top: -40px;
        left: 6px;
        z-index: 1000;
    }
    
    .skip-links a {
        position: absolute;
        left: -10000px;
        top: auto;
        width: 1px;
        height: 1px;
        overflow: hidden;
    }
    
    .skip-links a:focus {
        position: static;
        width: auto;
        height: auto;
        padding: 8px;
        background: var(--color-primary);
        color: white;
        text-decoration: none;
        border-radius: 4px;
    }
    
    /* Improve contrast for mobile */
    .btn-outline {
        border-width: 2px;
    }
    
    /* Larger font sizes for readability */
    body {
        font-size: 16px;
        line-height: 1.5;
    }
    
    h1 {
        font-size: 1.75rem;
        line-height: 1.2;
    }
    
    h2 {
        font-size: 1.5rem;
        line-height: 1.3;
    }
    
    h3 {
        font-size: 1.25rem;
        line-height: 1.3;
    }
}

/* =================================================================
   PRINT STYLES FOR MOBILE
   ================================================================= */

@media print {
    .hamburger,
    .theme-toggle,
    .search-box,
    .notifications,
    .sidebar-toggle,
    .mobile-sidebar-toggle,
    .nav-actions,
    .quick-actions {
        display: none !important;
    }
    
    .nav-menu {
        position: static;
        transform: none;
        opacity: 1;
        visibility: visible;
        background: none;
        flex-direction: row;
        padding: 0;
    }
    
    .main-content {
        width: 100%;
        margin: 0;
        padding: 0;
    }
    
    .dashboard-container {
        display: block;
    }
    
    .sidebar {
        display: none;
    }
}

/* =================================================================
   UTILITY CLASSES FOR MOBILE
   ================================================================= */

@media (max-width: 768px) {
    .mobile-hidden {
        display: none !important;
    }
    
    .mobile-only {
        display: block !important;
    }
    
    .mobile-flex {
        display: flex !important;
    }
    
    .mobile-grid {
        display: grid !important;
    }
    
    .mobile-full-width {
        width: 100% !important;
    }
    
    .mobile-text-center {
        text-align: center !important;
    }
    
    .mobile-text-left {
        text-align: left !important;
    }
    
    .mobile-stack {
        flex-direction: column !important;
        align-items: stretch !important;
    }
    
    .mobile-no-padding {
        padding: 0 !important;
    }
    
    .mobile-no-margin {
        margin: 0 !important;
    }
    
    .mobile-spacing {
        margin: 1rem 0 !important;
    }
}

/* Desktop hidden elements */
@media (min-width: 769px) {
    .mobile-only {
        display: none !important;
    }
    
    .hamburger {
        display: none;
    }
    
    .mobile-sidebar-toggle {
        display: none;
    }
}

/* =================================================================
   NOTIFICATION IMPROVEMENTS FOR MOBILE
   ================================================================= */

@media (max-width: 768px) {
    .auth-notification,
    .admin-notification,
    .donation-notification {
        position: fixed !important;
        top: 10px !important;
        left: 10px !important;
        right: 10px !important;
        width: auto !important;
        max-width: none !important;
        margin: 0 !important;
        z-index: 10002 !important;
    }
    
    .notification-content {
        font-size: 0.875rem;
        padding: 0.75rem;
    }
    
    .notification-close {
        min-width: 30px;
        min-height: 30px;
        font-size: 1.1rem;
    }
}

/* =================================================================
   MODAL IMPROVEMENTS FOR MOBILE
   ================================================================= */

@media (max-width: 768px) {
    .modal-content {
        width: 95%;
        max-width: none;
        margin: 1rem;
        max-height: 90vh;
        overflow-y: auto;
    }
    
    .modal-header {
        padding: 1rem;
        position: sticky;
        top: 0;
        background: var(--color-surface);
        border-bottom: 1px solid var(--color-border);
        z-index: 1;
    }
    
    .modal-body {
        padding: 1rem;
    }
    
    .modal-close {
        min-width: 44px;
        min-height: 44px;
        display: flex;
        align-items: center;
        justify-content: center;
    }
}

/* =================================================================
   LOADING STATES FOR MOBILE
   ================================================================= */

@media (max-width: 768px) {
    .loading-spinner {
        padding: 2rem 1rem;
        text-align: center;
    }
    
    .loading-spinner i {
        font-size: 1.5rem;
        margin-bottom: 0.5rem;
        display: block;
    }
    
    .loading-btn {
        opacity: 0.7;
        pointer-events: none;
    }
    
    .loading-btn .fa-spinner {
        margin-right: 0.5rem;
    }
}

/* =================================================================
   STICKY ELEMENTS FOR MOBILE
   ================================================================= */

@media (max-width: 768px) {
    .donation-summary.sticky {
        position: sticky;
        bottom: 0;
        background: var(--color-surface);
        border-top: 2px solid var(--color-primary);
        box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.1);
        z-index: 100;
    }
    
    .top-bar {
        position: sticky;
        top: 0;
        z-index: 100;
        background: var(--color-surface);
        border-bottom: 1px solid var(--color-border);
    }
}

/* =================================================================
   DARK MODE MOBILE ADJUSTMENTS
   ================================================================= */

@media (max-width: 768px) and (prefers-color-scheme: dark) {
    .nav-menu {
        background: var(--color-surface);
        border-right: 1px solid var(--color-border);
    }
    
    .modal-content {
        background: var(--color-surface);
        border: 1px solid var(--color-border);
    }
    
    .sidebar {
        background: var(--color-surface);
        border-right: 1px solid var(--color-border);
    }
}

/* =================================================================
   PROGRESSIVE ENHANCEMENT
   ================================================================= */

/* Base styles assume no JavaScript */
.no-js .nav-menu {
    display: none;
}

.no-js .hamburger:focus + .nav-menu,
.no-js .hamburger:hover + .nav-menu {
    display: flex;
}

/* Enhanced styles when JavaScript is available */
.js .nav-menu {
    display: flex;
}

/* Feature detection support */
@supports (display: grid) {
    @media (min-width: 769px) {
        .dashboard-container {
            display: grid;
            grid-template-columns: 280px 1fr;
        }
    }
}

@supports not (display: grid) {
    .dashboard-container {
        display: flex;
    }
    
    .sidebar {
        flex: 0 0 280px;
    }
    
    .main-content {
        flex: 1;
    }
}