/* ==============================================
   Mobile Responsive Optimization
   Multi-device Compatibility
   ============================================== */

/* ==============================================
   Base Mobile Styles (max-width: 768px)
   ============================================== */
@media (max-width: 768px) {
    :root {
        --container-padding: 1rem;
        --section-padding-y: 2rem;
        --spacing-xl: 1.5rem;
        --spacing-2xl: 2rem;
        --spacing-3xl: 2.5rem;
    }
    
    html {
        font-size: 15px;
        -webkit-text-size-adjust: 100%;
        -webkit-tap-highlight-color: transparent;
    }
    
    body {
        overflow-x: hidden;
        -webkit-overflow-scrolling: touch;
    }
    
    .container {
        padding-left: var(--container-padding);
        padding-right: var(--container-padding);
        max-width: 100%;
    }
    
    section {
        padding-top: var(--section-padding-y);
        padding-bottom: var(--section-padding-y);
    }
    
    h1 { font-size: 1.75rem; line-height: 1.2; }
    h2 { font-size: 1.5rem; line-height: 1.25; }
    h3 { font-size: 1.25rem; line-height: 1.3; }
    h4 { font-size: 1.125rem; }
    
    p { font-size: 0.9375rem; line-height: 1.6; }
    
    .btn {
        padding: 0.75rem 1.25rem;
        font-size: 0.9375rem;
        min-height: 48px;
    }
    
    .btn-lg {
        padding: 1rem 1.5rem;
        font-size: 1rem;
    }
    
    .card {
        padding: 1rem;
        margin-bottom: 1rem;
    }
    
    .grid {
        gap: 1rem;
    }
    
    .grid-2, .grid-3, .grid-4 {
        grid-template-columns: 1fr;
    }
    
    img {
        max-width: 100%;
        height: auto;
    }
    
    table {
        display: block;
        overflow-x: auto;
        white-space: nowrap;
    }
    
    form {
        max-width: 100%;
    }
    
    input, select, textarea, button {
        font-size: 16px !important;
        min-height: 48px;
    }
    
    input[type="text"],
    input[type="email"],
    input[type="tel"],
    input[type="password"],
    select,
    textarea {
        width: 100%;
        padding: 0.875rem 1rem;
        border-radius: var(--radius-md);
    }
    
    label {
        font-size: 0.9375rem;
        margin-bottom: 0.5rem;
        display: block;
    }
}

/* ==============================================
   Small Mobile Devices (max-width: 480px)
   ============================================== */
@media (max-width: 480px) {
    :root {
        --container-padding: 0.75rem;
        --section-padding-y: 1.5rem;
    }
    
    html {
        font-size: 14px;
    }
    
    h1 { font-size: 1.5rem; }
    h2 { font-size: 1.25rem; }
    h3 { font-size: 1.125rem; }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
    
    .btn-group {
        flex-direction: column;
        gap: 0.75rem;
    }
    
    .btn-group .btn {
        width: 100%;
    }
}

/* ==============================================
   Landscape Mobile (max-height: 500px)
   ============================================== */
@media (max-height: 500px) and (orientation: landscape) {
    :root {
        --section-padding-y: 1.5rem;
    }
    
    .hero-section {
        min-height: auto;
        padding-top: 1rem;
        padding-bottom: 1rem;
    }
    
    .hero-content h1 {
        font-size: 1.5rem;
        margin-bottom: 0.5rem;
    }
    
    .hero-content p {
        font-size: 0.875rem;
        margin-bottom: 0.75rem;
    }
}

/* ==============================================
   Tablet Devices (768px - 1024px)
   ============================================== */
@media (min-width: 769px) and (max-width: 1024px) {
    :root {
        --container-padding: 1.25rem;
        --section-padding-y: 3rem;
    }
    
    .grid-4 {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .grid-3 {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* ==============================================
   Touch Device Optimizations
   ============================================== */
@media (hover: none) and (pointer: coarse) {
    * {
        -webkit-tap-highlight-color: rgba(0, 0, 0, 0.1);
    }
    
    a, button, .btn, input, select, textarea {
        min-height: 44px;
        min-width: 44px;
    }
    
    .nav-menu-mobile li a,
    .nav-menu-mobile li button {
        min-height: 48px;
        padding-top: 1rem;
        padding-bottom: 1rem;
    }
    
    .dropdown-menu li a {
        min-height: 44px;
        padding-top: 0.75rem;
        padding-bottom: 0.75rem;
    }
    
    .card:hover {
        transform: none;
    }
    
    .btn:hover {
        transform: none;
    }
    
    input[type="checkbox"],
    input[type="radio"] {
        min-width: 24px;
        min-height: 24px;
    }
}

/* ==============================================
   Safe Area Insets (Notch Devices)
   ============================================== */
@supports (padding: max(0px)) {
    .header {
        padding-top: max(0px, env(safe-area-inset-top));
    }
    
    .footer {
        padding-bottom: max(0px, env(safe-area-inset-bottom));
    }
    
    .nav-menu-mobile {
        padding-left: max(0px, env(safe-area-inset-left));
        padding-right: max(0px, env(safe-area-inset-right));
        padding-bottom: max(0px, env(safe-area-inset-bottom));
    }
    
    .floating-buttons-container {
        bottom: max(24px, env(safe-area-inset-bottom));
        right: max(24px, env(safe-area-inset-right));
    }
    
    .container {
        padding-left: max(var(--container-padding), env(safe-area-inset-left));
        padding-right: max(var(--container-padding), env(safe-area-inset-right));
    }
}

/* ==============================================
   High DPI Screens
   ============================================== */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
    .logo img {
        image-rendering: -webkit-optimize-contrast;
    }
}

/* ==============================================
   Dark Mode Mobile
   ============================================== */
@media (prefers-color-scheme: dark) {
    .mobile-toggle-btn span {
        background-color: var(--text-primary);
    }
    
    .nav-menu-mobile {
        background-color: var(--bg-primary);
    }
    
    .nav-menu-mobile li a {
        color: var(--text-primary);
    }
}

/* ==============================================
   Print Styles
   ============================================== */
@media print {
    .header,
    .footer,
    .floating-buttons-container,
    .mobile-toggle-btn,
    .nav-menu-mobile {
        display: none !important;
    }
    
    body {
        font-size: 12pt;
        line-height: 1.5;
    }
    
    a[href]::after {
        content: " (" attr(href) ")";
    }
}

/* ==============================================
   Utility Classes for Mobile
   ============================================== */
@media (max-width: 768px) {
    .hide-mobile { display: none !important; }
    .show-mobile { display: block !important; }
    .text-center-mobile { text-align: center !important; }
    .full-width-mobile { width: 100% !important; max-width: 100% !important; }
    .no-padding-mobile { padding: 0 !important; }
    .no-margin-mobile { margin: 0 !important; }
    .stack-mobile { flex-direction: column !important; }
    .gap-sm-mobile { gap: 0.5rem !important; }
    .gap-md-mobile { gap: 1rem !important; }
}

@media (min-width: 769px) {
    .hide-desktop { display: none !important; }
    .show-desktop { display: block !important; }
}

/* ==============================================
   Smooth Scroll for Touch
   ============================================== */
@media (hover: none) {
    html {
        scroll-behavior: smooth;
    }
    
    .smooth-scroll {
        -webkit-overflow-scrolling: touch;
        overflow-y: auto;
    }
}

/* ==============================================
   Form Optimizations
   ============================================== */
@media (max-width: 768px) {
    .form-row {
        flex-direction: column;
        gap: 1rem;
    }
    
    .form-row > * {
        width: 100%;
    }
    
    .form-group {
        margin-bottom: 1rem;
    }
    
    .input-group {
        flex-direction: column;
    }
    
    .input-group input,
    .input-group button {
        width: 100%;
        border-radius: var(--radius-md) !important;
    }
    
    .input-group input:not(:last-child),
    .input-group button:not(:last-child) {
        margin-bottom: 0.5rem;
    }
}

/* ==============================================
   Image Optimizations
   ============================================== */
@media (max-width: 768px) {
    .hero-image,
    .feature-image,
    .product-image {
        width: 100%;
        height: auto;
        object-fit: cover;
    }
    
    .image-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 0.5rem;
    }
    
    .image-grid.single-mobile {
        grid-template-columns: 1fr;
    }
}

/* ==============================================
   Modal Optimizations
   ============================================== */
@media (max-width: 768px) {
    .modal {
        padding: 1rem;
    }
    
    .modal-content {
        width: 100%;
        max-width: 100%;
        margin: 0;
        max-height: 90vh;
        overflow-y: auto;
        border-radius: var(--radius-lg);
    }
    
    .modal-header,
    .modal-body,
    .modal-footer {
        padding: 1rem;
    }
}

/* ==============================================
   Table Optimizations
   ============================================== */
@media (max-width: 768px) {
    .table-responsive {
        display: block;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }
    
    .table-mobile-stacked thead {
        display: none;
    }
    
    .table-mobile-stacked tr {
        display: block;
        margin-bottom: 1rem;
        border: 1px solid var(--border-color);
        border-radius: var(--radius-md);
    }
    
    .table-mobile-stacked td {
        display: flex;
        justify-content: space-between;
        padding: 0.75rem 1rem;
        border-bottom: 1px solid var(--border-light);
    }
    
    .table-mobile-stacked td:last-child {
        border-bottom: none;
    }
    
    .table-mobile-stacked td::before {
        content: attr(data-label);
        font-weight: var(--font-weight-semibold);
        margin-right: 1rem;
    }
}

/* ==============================================
   Navigation Optimizations
   ============================================== */
@media (max-width: 768px) {
    .breadcrumb {
        flex-wrap: wrap;
        font-size: 0.875rem;
    }
    
    .breadcrumb-item {
        white-space: nowrap;
    }
    
    .pagination {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .pagination-item {
        min-width: 44px;
        min-height: 44px;
    }
}

/* ==============================================
   Animation Performance
   ============================================== */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* ==============================================
   Loading States
   ============================================== */
.skeleton {
    background: linear-gradient(90deg, var(--bg-secondary) 25%, var(--bg-tertiary) 50%, var(--bg-secondary) 75%);
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s infinite;
}

@keyframes skeleton-loading {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* ==============================================
   Focus Visible for Keyboard Navigation
   ============================================== */
:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

:focus:not(:focus-visible) {
    outline: none;
}