/* Tablet */
@media (max-width: 1024px) {
    .main-container {
        grid-template-columns: 1fr;
        gap: var(--space-md);
    }
    
    .sidebar {
        order: -1;
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: var(--space-md);
    }
    
    .profile-card {
        grid-column: 1 / -1;
    }
    
    .search-container {
        flex: 0 1 200px;
    }
    
    .nav-links {
        gap: var(--space-xs);
    }
    
    .nav-link {
        padding: var(--space-xs) var(--space-sm);
        font-size: 13px;
    }
}

/* Mobile Large */
@media (max-width: 768px) {
    .nav-container {
        flex-wrap: wrap;
        gap: var(--space-md);
    }
    
    .main-nav {
        display: none;
    }
    
    .search-container {
        order: 3;
        flex: 1 1 100%;
        margin-top: var(--space-sm);
    }
    
    .mobile-menu-btn {
        display: flex;
    }
    
    .mobile-menu.show {
        display: block;
    }
    
    .sidebar {
        grid-template-columns: 1fr;
    }
    
    .modal-content {
        margin: 10% auto;
        width: 95%;
        padding: var(--space-lg);
    }
    
    .chat-modal .modal-content {
        margin: 0;
        width: 100%;
        height: 100%;
        border-radius: 0;
    }
    
    .form-row {
        flex-direction: column;
        gap: var(--space-md);
    }
    
    .post-options {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .post-actions {
        flex-direction: column;
        gap: var(--space-md);
    }
    
    .btn-post {
        width: 100%;
    }
    
    .chat-message {
        max-width: 85%;
    }
}

/* Mobile Small */
@media (max-width: 480px) {
    .nav-container {
        padding: 0 var(--space-sm);
    }
    
    .logo span {
        display: none;
    }
    
    .auth-buttons {
        gap: var(--space-xs);
    }
    
    .btn {
        padding: var(--space-xs) var(--space-md);
        font-size: 12px;
    }
    
    .user-menu .username {
        display: none;
    }
    
    .main-container {
        padding: 0 var(--space-sm);
        margin: var(--space-md) auto;
    }
    
    .card {
        padding: var(--space-md);
        margin-bottom: var(--space-md);
    }
    
    .profile-header {
        flex-direction: column;
        text-align: center;
        gap: var(--space-md);
    }
    
    .profile-info {
        text-align: center;
    }
    
    .online-user {
        padding: var(--space-xs);
    }
    
    .action-btns {
        flex-direction: column;
        gap: 2px;
    }
    
    .action-btn-small {
        padding: 2px 6px;
        font-size: 10px;
    }
    
    .notifications-container {
        right: var(--space-sm);
        left: var(--space-sm);
        max-width: none;
    }
}

/* Dark Mode Support */
@media (prefers-color-scheme: dark) {
    :root {
        --bg-color: #1a1a1a;
        --card-bg: #2d2d2d;
        --text-primary: #ffffff;
        --text-secondary: #b0b3b8;
        --text-muted: #8a8d91;
        --border-color: #3a3a3a;
        --hover-color: #3a3a3a;
    }
    
    .search-results,
    .user-dropdown {
        background: var(--card-bg);
        border: 1px solid var(--border-color);
    }
    
    .search-box {
        background: rgba(255,255,255,0.1);
        color: white;
    }
    
    .search-box::placeholder {
        color: rgba(255,255,255,0.6);
    }
    
    .btn-edit-profile,
    .btn-load-more,
    .quick-action {
        background: var(--bg-color);
        color: var(--text-primary);
    }
    
    .tab {
        background: var(--bg-color);
    }
    
    .online-badge {
        background: rgba(10, 126, 164, 0.2);
    }
    
    /* Scrollbar Dark Mode */
    ::-webkit-scrollbar-track {
        background: #2d2d2d;
    }
    
    ::-webkit-scrollbar-thumb {
        background: #555;
    }
    
    ::-webkit-scrollbar-thumb:hover {
        background: #777;
    }
}

/* High Contrast Mode */
@media (prefers-contrast: high) {
    :root {
        --border-color: #000000;
        --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
        --shadow-md: 0 4px 12px rgba(0,0,0,0.3);
        --shadow-lg: 0 8px 25px rgba(0,0,0,0.3);
    }
    
    .card {
        border: 1px solid var(--border-color);
    }
}

/* Print Styles */
@media print {
    .header,
    .sidebar,
    .create-post-card,
    .post-interactions,
    .mobile-menu-btn {
        display: none !important;
    }
    
    .main-container {
        grid-template-columns: 1fr;
        margin: 0;
        padding: 0;
    }
    
    .card {
        box-shadow: none;
        border: 1px solid #000;
        break-inside: avoid;
    }
    
    body {
        background: white;
        color: black;
    }
}

/* Landscape Mobile */
@media (max-height: 500px) and (orientation: landscape) {
    .modal-content {
        margin: 2% auto;
        max-height: 96vh;
        overflow-y: auto;
    }
    
    .chat-modal .modal-content {
        height: 96vh;
    }
    
    .header {
        position: static;
    }
    
    .main-container {
        margin: var(--space-sm) auto;
    }
}

/* Very Large Screens */
@media (min-width: 1600px) {
    .nav-container,
    .main-container {
        max-width: 1400px;
    }
    
    .sidebar {
        grid-template-columns: 1fr;
    }
}

/* Touch Device Optimizations */
@media (hover: none) and (pointer: coarse) {
    .user-menu:hover .user-dropdown {
        display: none;
    }
    
    .user-menu:active .user-dropdown,
    .user-menu:focus .user-dropdown {
        display: block;
    }
    
    .interaction-btn:hover {
        background: transparent;
    }
    
    .interaction-btn:active {
        background: var(--hover-color);
    }
    
    /* Larger touch targets */
    .nav-link,
    .post-option,
    .interaction-btn,
    .action-btn-small {
        min-height: 44px;
        min-width: 44px;
    }
    
    .btn {
        min-height: 44px;
        padding: var(--space-md) var(--space-lg);
    }
}