/* ============================================
   COMPREHENSIVE RESPONSIVE SYSTEM
   Mobile-First Approach
   ============================================ */

/* Extra Small Devices (phones, 320px and up) */
@media (max-width: 480px) {
    :root {
        --spacing-xs: 0.4rem;
        --spacing-sm: 0.75rem;
        --spacing-md: 1rem;
        --spacing-lg: 1.5rem;
        --spacing-xl: 2rem;
        font-size: 14px;
    }
    
    /* Search Bar */
    .search-container {
        margin-top: var(--spacing-md);
        padding: 0 var(--spacing-sm);
    }
    
    .search-input {
        font-size: 16px; /* Prevents zoom on iOS */
        padding: var(--spacing-sm) var(--spacing-md);
    }
    
    .search-results {
        max-height: 300px;
        font-size: 0.9rem;
        position: fixed;
        top: 60px;
        left: 0;
        right: 0;
        border-radius: 0;
        border-left: none;
        border-right: none;
    }
    
    .search-result-item {
        padding: var(--spacing-sm);
    }
    
    .search-result-meta {
        flex-direction: column;
        gap: var(--spacing-xs);
        font-size: 0.75rem;
    }
    
    /* Progress Actions */
    .progress-actions {
        flex-direction: column;
        width: 100%;
        gap: var(--spacing-sm);
    }
    
    .btn-progress {
        width: 100%;
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: 0.9rem;
        min-height: 44px; /* Touch target */
    }
    
    /* Certificate Modal */
    .certificate-modal {
        padding: var(--spacing-sm);
    }
    
    .certificate-content {
        width: 95%;
        padding: var(--spacing-md);
        max-height: 95vh;
        border-radius: var(--radius-md);
    }
    
    .certificate-title {
        font-size: 1.8rem;
    }
    
    .certificate-subtitle {
        font-size: 1.2rem;
    }
    
    .certificate-course {
        font-size: 1rem;
        padding: var(--spacing-sm);
    }
    
    .certificate-recipient {
        font-size: 1.4rem;
        padding: var(--spacing-sm);
    }
    
    .certificate-actions {
        flex-direction: column;
        width: 100%;
        gap: var(--spacing-sm);
    }
    
    .btn-certificate {
        width: 100%;
        min-height: 44px;
    }
    
    /* Theme Toggle - mobile sizing */
    .theme-toggle {
        width: 40px;
        height: 40px;
        font-size: 1.2rem;
    }
    
    /* Quiz & Challenge */
    .quiz-question,
    .challenge-item {
        padding: var(--spacing-sm);
    }
    
    .quiz-option,
    .challenge-input {
        padding: var(--spacing-sm);
        font-size: 0.9rem;
        min-height: 44px;
    }
    
    .challenge-submit {
        width: 100%;
        min-height: 44px;
    }
    
    /* Lesson Cards */
    .lesson-card a {
        flex-direction: column;
        align-items: center;
        text-align: center;
        padding: var(--spacing-md);
        gap: var(--spacing-sm);
    }
    
    .lesson-content-wrapper {
        text-align: center;
    }
    
    .lesson-progress,
    .lesson-checkmark {
        align-self: center;
    }
    
    /* Header */
    header {
        padding: var(--spacing-md) var(--spacing-sm);
    }
    
    header h1 {
        font-size: clamp(1.2rem, 8vw, 1.8rem);
        line-height: 1.2;
    }
    
    header .sub-heading {
        font-size: clamp(0.75rem, 4vw, 0.9rem);
        margin-top: var(--spacing-xs);
    }
    
    /* Navbar */
    .navbar-container {
        padding: 0 var(--spacing-sm);
        height: 60px;
    }
    
    .navbar-brand a {
        font-size: 1.2rem;
    }
    
    /* Progress Overview */
    #progress-overview {
        padding: var(--spacing-md);
    }
    
    #progress-overview h2 {
        font-size: 1.1rem;
    }
    
    .progress-bar {
        height: 30px;
        font-size: 0.85rem;
    }
    
    /* Lesson Navigation */
    .lesson-nav {
        flex-direction: column;
        gap: var(--spacing-sm);
        padding: var(--spacing-sm);
    }
    
    .lesson-progress-bar {
        width: 100%;
    }
    
    /* Lesson Content */
    .lesson-content section {
        padding: var(--spacing-sm);
    }
    
    .lesson-meta {
        flex-direction: column;
        align-items: flex-start;
    }
}

/* Small Devices (landscape phones, 481px and up) */
@media (min-width: 481px) and (max-width: 768px) {
    :root {
        font-size: 15px;
    }
    
    .search-container {
        max-width: 100%;
    }
    
    .search-results {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        max-height: calc(100vh - 70px);
    }
    
    .lesson-card a {
        flex-direction: column;
        align-items: center;
        gap: var(--spacing-sm);
    }
    
    .lesson-content-wrapper {
        text-align: center;
    }
    
    .lesson-progress,
    .lesson-checkmark {
        align-self: center;
    }
    
    .progress-actions {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-sm);
    }
    
    .btn-progress {
        min-width: calc(50% - var(--spacing-xs));
    }
    
    .certificate-content {
        width: 90%;
    }
}

/* Tablets (portrait, 769px and up) */
@media (min-width: 769px) and (max-width: 1024px) {
    :root {
        font-size: 15px;
    }
    
    body {
        padding: var(--spacing-lg) var(--spacing-md);
    }
    
    .search-container {
        max-width: 700px;
    }
    
    .search-results {
        position: absolute;
        top: calc(100% + 0.5rem);
        border-radius: var(--radius-md);
    }
    
    .lesson-card a {
        flex-direction: column;
        align-items: center;
        padding: var(--spacing-md) var(--spacing-lg);
    }
    
    .lesson-content-wrapper {
        text-align: center;
    }
    
    .lesson-progress,
    .lesson-checkmark {
        align-self: center;
    }
    
    .certificate-content {
        max-width: 700px;
    }
    
    /* 2 columns for progress actions on tablet */
    .progress-actions {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-sm);
    }
    
    .btn-progress {
        width: 100%;
    }
}

/* Desktop (1025px and up) */
@media (min-width: 1025px) and (max-width: 1440px) {
    body {
        max-width: 1200px;
    }
    
    .search-container {
        max-width: 600px;
    }
    
    .lesson-card a {
        flex-direction: column;
        align-items: center;
    }
    
    .lesson-content-wrapper {
        text-align: center;
    }
    
    .lesson-progress,
    .lesson-checkmark {
        align-self: center;
    }
    
    .lesson-card:hover {
        transform: translateY(-4px);
    }
}

/* Large Desktop (1441px and up) */
@media (min-width: 1441px) {
    body {
        max-width: 1400px;
    }
    
    :root {
        font-size: 18px;
    }
    
    .search-container {
        max-width: 700px;
    }
    
    .certificate-content {
        max-width: 800px;
    }
    
    .lesson-card a {
        flex-direction: column;
        align-items: center;
    }
    
    .lesson-content-wrapper {
        text-align: center;
    }
    
    .lesson-progress,
    .lesson-checkmark {
        align-self: center;
    }
}

/* Landscape Orientation */
@media (orientation: landscape) and (max-height: 600px) {
    .top-navbar {
        height: 60px;
    }
    
    .navbar-container {
        height: 60px;
    }
    
    header {
        padding: var(--spacing-sm) var(--spacing-md);
    }
    
    header h1 {
        font-size: 1.5rem;
    }
    
    .certificate-content {
        max-height: 90vh;
        padding: var(--spacing-md);
    }
    
    .certificate-body {
        padding: var(--spacing-md);
    }
    
    .certificate-title {
        font-size: 2rem;
    }
}

/* Touch Devices */
@media (hover: none) and (pointer: coarse) {
    /* Larger touch targets */
    button,
    a,
    .btn-progress,
    .btn-certificate,
    .quiz-option,
    .challenge-submit,
    .nav-link {
        min-height: 44px;
        min-width: 44px;
    }
    
    /* Remove hover effects on touch devices */
    .lesson-card:hover {
        transform: none;
    }
    
    /* Show active states instead */
    .lesson-card:active {
        transform: scale(0.98);
    }
    
    /* Larger tap targets for navigation */
    .nav-link {
        padding: var(--spacing-md) var(--spacing-lg);
    }
    
    /* Disable tilt effect on touch */
    .tilt-card {
        transform: none !important;
    }
}

/* High DPI Displays */
@media (-webkit-min-device-pixel-ratio: 2),
       (min-resolution: 192dpi) {
    /* Sharper borders and shadows */
    .lesson-card,
    .card,
    section {
        border-width: 0.5px;
    }
}

/* Print Styles Enhancement */
@media print {
    .top-navbar,
    .theme-toggle,
    .search-container,
    .progress-actions,
    .certificate-actions,
    .particles {
        display: none !important;
    }
    
    body {
        background: white;
        color: black;
        padding: 1rem;
    }
    
    .lesson-card {
        break-inside: avoid;
        page-break-inside: avoid;
    }
    
    header h1 {
        color: black;
    }
}

/* Reduced Motion */
@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;
    }
    
    .particles {
        display: none;
    }
}

/* Focus Visible for Accessibility */
@media (prefers-reduced-motion: no-preference) {
    *:focus-visible {
        outline: 2px solid var(--accent);
        outline-offset: 2px;
        border-radius: var(--radius-sm);
    }
}

/* Container Queries Support (Modern Browsers) */
@supports (container-type: inline-size) {
    .lesson-content-wrapper {
        container-type: inline-size;
    }
    
    @container (max-width: 400px) {
        .lesson-content-wrapper {
            flex-direction: column;
        }
    }
}