/* ========================================
   CASE Learning Platform - Responsive Design
   ======================================== */

/* Mobile First Approach */

/* Extra Small Devices (phones, 576px and down) */
@media (max-width: 575.98px) {
    /* Typography */
    .hero-title {
        font-size: var(--font-size-3xl);
    }
    
    .section-title {
        font-size: var(--font-size-2xl);
    }
    
    .course-title,
    .tutorial-title {
        font-size: var(--font-size-base);
    }
    
    /* Spacing */
    .hero-section,
    .featured-courses-section,
    .learning-paths-section,
    .latest-tutorials-section {
        padding: var(--spacing-xl) 0;
    }
    
    /* Hero Section */
    .hero-stats {
        flex-direction: column;
        gap: var(--spacing-md);
        text-align: center;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: stretch;
    }
    
    .hero-buttons .btn {
        width: 100%;
        justify-content: center;
    }
    
    /* Course Cards */
    .course-card,
    .tutorial-card {
        margin-bottom: var(--spacing-lg);
    }
    
    .course-content,
    .tutorial-content {
        padding: var(--spacing-md);
    }
    
    .course-footer,
    .tutorial-footer {
        flex-direction: column;
        align-items: stretch;
        gap: var(--spacing-md);
    }
    
    .course-info,
    .tutorial-stats {
        justify-content: center;
    }
    
    /* Learning Path Cards */
    .path-card {
        padding: var(--spacing-lg);
        margin-bottom: var(--spacing-lg);
    }
    
    .path-stats {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    /* Search */
    .search-container {
        max-width: 100%;
        margin-bottom: var(--spacing-md);
    }
    
    /* Navigation */
    .navbar-brand .brand-text {
        display: none;
    }
    
    .navbar-nav {
        text-align: center;
        padding-top: var(--spacing-md);
    }
    
    .navbar-nav .nav-item {
        margin: var(--spacing-xs) 0;
    }
    
    .navbar-nav .nav-link {
        padding: var(--spacing-md);
        border-radius: var(--border-radius-md);
    }
    
    /* Comments */
    .comment-item {
        padding: var(--spacing-md);
    }
    
    .comment-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-sm);
    }
    
    .commenter-info {
        gap: var(--spacing-sm);
    }
    
    .comment-reactions {
        flex-wrap: wrap;
        gap: var(--spacing-sm);
    }
    
    /* Forms */
    .add-comment-form {
        padding: var(--spacing-md);
    }
    
    .form-actions {
        text-align: center;
    }
    
    /* CTA Sections */
    .cta-section .row {
        text-align: center;
    }
    
    .cta-buttons {
        justify-content: center;
        flex-direction: column;
        align-items: center;
    }
    
    .cta-buttons .btn {
        width: 100%;
        max-width: 300px;
    }
    
    /* Footer */
    .footer-section {
        margin-bottom: var(--spacing-xl);
        text-align: center;
    }
    
    .footer-links {
        list-style: none;
        padding: 0;
    }
    
    .footer-links li {
        margin-bottom: var(--spacing-sm);
    }
    
    .social-links {
        justify-content: center;
    }
    
    /* Back to Top */
    .back-to-top {
        bottom: var(--spacing-md);
        right: var(--spacing-md);
        width: 45px;
        height: 45px;
    }
    
    /* Floating Elements */
    .floating-card {
        display: none;
    }
}

/* Small Devices (landscape phones, 576px and up) */
@media (min-width: 576px) and (max-width: 767.98px) {
    .hero-title {
        font-size: var(--font-size-4xl);
    }
    
    .hero-stats {
        justify-content: center;
    }
    
    .course-footer,
    .tutorial-footer {
        flex-direction: row;
        align-items: center;
    }
    
    .path-stats {
        flex-direction: row;
        justify-content: space-around;
    }
    
    .comment-header {
        flex-direction: row;
        align-items: center;
    }
    
    .cta-buttons {
        flex-direction: row;
        justify-content: center;
    }
}

/* Medium Devices (tablets, 768px and up) */
@media (min-width: 768px) and (max-width: 991.98px) {
    .hero-title {
        font-size: var(--font-size-4xl);
    }
    
    .section-title {
        font-size: var(--font-size-3xl);
    }
    
    .course-content,
    .tutorial-content {
        padding: var(--spacing-lg);
    }
    
    .path-card {
        padding: var(--spacing-xl);
    }
    
    .comment-item {
        padding: var(--spacing-lg);
    }
    
    .add-comment-form {
        padding: var(--spacing-lg);
    }
    
    /* Top Bar */
    .top-bar {
        display: block;
    }
    
    /* Search */
    .search-container {
        max-width: 350px;
    }
    
    /* Navigation */
    .navbar-nav {
        padding-top: 0;
    }
    
    .navbar-nav .nav-item {
        margin: 0;
    }
    
    .navbar-nav .nav-link {
        padding: var(--spacing-sm) var(--spacing-md);
    }
}

/* Large Devices (desktops, 992px and up) */
@media (min-width: 992px) {
    .hero-title {
        font-size: var(--font-size-5xl);
    }
    
    .section-title {
        font-size: var(--font-size-3xl);
    }
    
    .course-content,
    .tutorial-content {
        padding: var(--spacing-lg);
    }
    
    .path-card {
        padding: var(--spacing-xl);
    }
    
    .comment-item {
        padding: var(--spacing-lg);
    }
    
    .add-comment-form {
        padding: var(--spacing-lg);
    }
    
    /* Top Bar */
    .top-bar {
        display: block;
    }
    
    /* Search */
    .search-container {
        max-width: 400px;
    }
    
    /* Navigation */
    .navbar-nav {
        padding-top: 0;
    }
    
    .navbar-nav .nav-item {
        margin: 0;
    }
    
    .navbar-nav .nav-link {
        padding: var(--spacing-sm) var(--spacing-md);
    }
    
    /* Floating Elements */
    .floating-card {
        display: flex;
    }
}

/* Extra Large Devices (large desktops, 1200px and up) */
@media (min-width: 1200px) {
    .container {
        max-width: 1140px;
    }
    
    .hero-title {
        font-size: var(--font-size-5xl);
    }
    
    .section-title {
        font-size: var(--font-size-3xl);
    }
    
    /* Course Grid */
    .course-card,
    .tutorial-card {
        margin-bottom: 0;
    }
    
    /* Learning Path Grid */
    .path-card {
        margin-bottom: 0;
    }
}

/* Extra Extra Large Devices (1400px and up) */
@media (min-width: 1400px) {
    .container {
        max-width: 1320px;
    }
    
    .hero-title {
        font-size: var(--font-size-5xl);
    }
    
    .section-title {
        font-size: var(--font-size-3xl);
    }
}

/* Landscape Orientation */
@media (orientation: landscape) and (max-height: 500px) {
    .hero-section {
        min-height: 100vh;
        padding: var(--spacing-md) 0;
    }
    
    .hero-title {
        font-size: var(--font-size-3xl);
    }
    
    .hero-description {
        font-size: var(--font-size-lg);
    }
    
    .hero-stats {
        flex-direction: row;
        justify-content: center;
    }
}

/* High DPI Displays */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
    .course-image img,
    .tutorial-image img {
        image-rendering: -webkit-optimize-contrast;
        image-rendering: crisp-edges;
    }
}

/* Print Styles */
@media print {
    .learning-header,
    .learning-footer,
    .back-to-top,
    .course-actions,
    .tutorial-actions,
    .comment-actions,
    .reaction-btn {
        display: none !important;
    }
    
    .hero-section,
    .featured-courses-section,
    .learning-paths-section,
    .latest-tutorials-section {
        padding: var(--spacing-md) 0;
        page-break-inside: avoid;
    }
    
    .course-card,
    .tutorial-card,
    .path-card,
    .comment-item {
        break-inside: avoid;
        margin-bottom: var(--spacing-md);
        box-shadow: none;
        border: 1px solid #ddd;
    }
    
    .hero-title,
    .section-title,
    .course-title,
    .tutorial-title {
        color: #000 !important;
    }
    
    .hero-description,
    .section-description,
    .course-description,
    .tutorial-description {
        color: #333 !important;
    }
    
    a {
        color: #000 !important;
        text-decoration: underline !important;
    }
    
    .btn {
        border: 1px solid #000 !important;
        background: transparent !important;
        color: #000 !important;
    }
}

/* Accessibility - Reduced Motion */
@media (prefers-reduced-motion: reduce) {
    .course-card:hover,
    .tutorial-card:hover,
    .path-card:hover {
        transform: none;
    }
    
    .course-image img,
    .tutorial-image img {
        transition: none;
    }
    
    .course-card:hover .course-image img,
    .tutorial-card:hover .tutorial-image img {
        transform: none;
    }
    
    .floating-card {
        animation: none;
    }
    
    .reaction-btn.reaction-active {
        transform: none;
    }
}

/* Accessibility - High Contrast */
@media (prefers-contrast: high) {
    .course-card,
    .tutorial-card,
    .path-card,
    .comment-item {
        border: 2px solid #000;
    }
    
    .btn-primary {
        background: #000;
        border-color: #000;
        color: #fff;
    }
    
    .btn-outline-primary {
        border-color: #000;
        color: #000;
    }
    
    .btn-outline-primary:hover {
        background: #000;
        color: #fff;
    }
}

/* Dark Mode Support */
@media (prefers-color-scheme: dark) {
    :root {
        --white: #1a1a1a;
        --light-color: #2d2d2d;
        --dark-color: #ffffff;
        --secondary-color: #cccccc;
    }
    
    body {
        background-color: var(--white);
        color: var(--dark-color);
    }
    
    .course-card,
    .tutorial-card,
    .path-card,
    .comment-item,
    .add-comment-form {
        background-color: var(--light-color);
        border-color: #444;
    }
    
    .form-control {
        background-color: var(--light-color);
        border-color: #444;
        color: var(--dark-color);
    }
    
    .form-control:focus {
        border-color: var(--primary-color);
        background-color: var(--light-color);
    }
}

/* Focus Management for Keyboard Navigation */
@media (any-hover: none) {
    .course-card:hover,
    .tutorial-card:hover,
    .path-card:hover {
        transform: none;
    }
    
    .course-overlay,
    .tutorial-overlay {
        opacity: 1;
    }
}

/* Touch Device Optimizations */
@media (hover: none) and (pointer: coarse) {
    .btn {
        min-height: 44px;
        min-width: 44px;
    }
    
    .reaction-btn {
        min-height: 44px;
        min-width: 44px;
    }
    
    .nav-link {
        min-height: 44px;
        display: flex;
        align-items: center;
    }
    
    .course-actions .btn,
    .tutorial-actions .btn {
        min-height: 44px;
        min-width: 44px;
    }
}