/* ========================
   Responsive Design
   ======================== */

/* Tablets (768px and down) */
@media (max-width: 768px) {
    :root {
        --spacing-xl: 1.5rem;
        --spacing-2xl: 2rem;
    }

    .navbar {
        flex-direction: column;
        gap: var(--spacing-lg);
        padding: var(--spacing-lg);
    }

    .navbar-brand h1 {
        font-size: var(--font-size-2xl);
    }

    .navbar-menu {
        width: 100%;
        gap: var(--spacing-md);
        flex-wrap: wrap;
        justify-content: center;
    }

    .nav-btn {
        padding: var(--spacing-md);
        font-size: var(--font-size-sm);
    }

    .main-content {
        padding: var(--spacing-lg);
    }

    .dashboard-grid {
        gap: var(--spacing-lg);
    }

    .stats-container {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-md);
    }

    .stat-card {
        padding: var(--spacing-md);
    }

    .stat-card h3 {
        font-size: var(--font-size-2xl);
    }

    .courses-grid {
        grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
        gap: var(--spacing-md);
    }

    .lesson-editor-container {
        grid-template-columns: 1fr;
    }

    .alphatab-preview {
        position: static;
        margin-top: var(--spacing-lg);
    }

    .modal-content {
        width: 95%;
        padding: var(--spacing-lg);
    }

    .course-detail-header {
        margin-bottom: var(--spacing-lg);
    }

    .section-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-md);
    }

    .section-header h3 {
        margin: 0;
    }

    .btn-add-course {
        width: 100%;
    }

    .form-actions {
        flex-direction: column;
    }

    .form-actions button {
        width: 100%;
    }

    .toast-container {
        left: var(--spacing-lg);
        right: var(--spacing-lg);
    }

    .toast {
        min-width: auto;
        width: 100%;
    }
}

/* Mobile (480px and down) */
@media (max-width: 480px) {
    :root {
        --font-size-xl: 1.125rem;
        --font-size-2xl: 1.5rem;
        --font-size-3xl: 1.5rem;
        --spacing-lg: 1rem;
        --spacing-xl: 1rem;
    }

    body {
        font-size: var(--font-size-sm);
    }

    .navbar {
        padding: var(--spacing-md);
        gap: var(--spacing-md);
    }

    .navbar-brand h1 {
        font-size: var(--font-size-xl);
    }

    .navbar-menu {
        gap: var(--spacing-sm);
        width: 100%;
    }

    .nav-btn {
        padding: var(--spacing-sm);
        font-size: var(--font-size-sm);
        border-radius: 4px;
        flex: 1;
        text-align: center;
    }

    .main-content {
        padding: var(--spacing-md);
    }

    .dashboard-header h2 {
        font-size: var(--font-size-2xl);
    }

    .dashboard-header p {
        font-size: var(--font-size-base);
    }

    .stats-container {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    .stat-card {
        padding: var(--spacing-md);
    }

    .stat-card h3 {
        font-size: var(--font-size-xl);
    }

    .stat-card p {
        font-size: var(--font-size-xs);
    }

    .courses-grid {
        grid-template-columns: 1fr;
    }

    .course-card {
        padding: var(--spacing-md);
    }

    .course-card h3 {
        font-size: var(--font-size-lg);
    }

    .lesson-item {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    .lesson-info h3 {
        font-size: var(--font-size-base);
    }

    .lesson-actions {
        width: 100%;
        flex-wrap: wrap;
    }

    .lesson-actions button {
        flex: 1;
        min-width: 80px;
    }

    h1 { font-size: var(--font-size-2xl); }
    h2 { font-size: var(--font-size-xl); }
    h3 { font-size: var(--font-size-lg); }
    h4 { font-size: var(--font-size-base); }

    .btn {
        padding: var(--spacing-md);
        font-size: var(--font-size-sm);
        width: 100%;
        text-align: center;
    }

    .btn-group {
        display: flex;
        flex-direction: column;
        gap: var(--spacing-md);
    }

    input, textarea, select {
        padding: var(--spacing-md);
        font-size: 16px; /* Prevent zoom on iOS */
    }

    label {
        font-size: var(--font-size-sm);
    }

    .modal-content {
        width: 90%;
        padding: var(--spacing-md);
        max-height: 90vh;
        overflow-y: auto;
    }

    .close {
        top: var(--spacing-md);
        right: var(--spacing-md);
        font-size: var(--font-size-xl);
    }

    .course-info-grid {
        grid-template-columns: 1fr;
    }

    .view-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-md);
    }

    .view-header h2 {
        margin: 0 0 var(--spacing-md) 0;
    }

    .view-header button {
        width: 100%;
    }

    .lesson-editor-container form {
        margin-bottom: var(--spacing-lg);
    }

    .settings-container {
        width: 100%;
    }

    .settings-section {
        padding: var(--spacing-md);
    }

    #google-drive-status button {
        width: 100%;
        margin-right: 0;
        margin-bottom: var(--spacing-md);
    }

    .lessons-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-md);
    }

    .lessons-header button {
        width: 100%;
    }

    .toast-container {
        left: var(--spacing-md);
        right: var(--spacing-md);
        bottom: var(--spacing-md);
    }

    .toast {
        min-width: auto;
        width: 100%;
        padding: var(--spacing-md);
    }

    /* AlphaTab adjustment for mobile */
    #alphatab-container {
        min-height: 200px;
        font-size: var(--font-size-sm);
    }
}

/* Landscape Mobile (max-height: 500px) */
@media (max-height: 500px) and (max-width: 768px) {
    .navbar {
        padding: var(--spacing-sm) var(--spacing-md);
    }

    .main-content {
        padding: var(--spacing-md);
    }

    .modal-content {
        max-height: 90vh;
        overflow-y: auto;
    }
}

/* Large Desktop (1440px and above) */
@media (min-width: 1440px) {
    .main-content {
        max-width: 1400px;
    }

    .courses-grid {
        grid-template-columns: repeat(4, 1fr);
    }

    .stats-container {
        grid-template-columns: repeat(4, 1fr);
    }
}

/* Very Large Desktop (1920px and above) */
@media (min-width: 1920px) {
    .main-content {
        max-width: 1600px;
    }

    .stats-container {
        gap: var(--spacing-xl);
    }

    .courses-grid {
        gap: var(--spacing-xl);
    }
}

/* High DPI / Retina Displays */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
    /* Slightly sharper shadows and borders */
    .btn:active {
        transform: scale(0.98);
    }
}

/* Accessibility - Prefers Reduced Motion */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* Accessibility - Dark Mode Preference */
@media (prefers-color-scheme: dark) {
    :root {
        --dark: #f9fafb;
        --light: #1f2937;
    }

    body {
        background-color: #111827;
        color: var(--dark);
    }

    .navbar,
    .modal-content,
    .course-card,
    .stat-card,
    .recent-section,
    .settings-section,
    .course-info,
    .lessons-container,
    .alphatab-preview {
        background-color: #1f2937;
        color: var(--dark);
    }

    input[type="text"],
    input[type="email"],
    input[type="password"],
    input[type="url"],
    input[type="number"],
    textarea,
    select {
        background-color: #374151;
        color: var(--dark);
        border-color: #4b5563;
    }

    .course-card h3,
    .info-item h4 {
        color: var(--primary-light);
    }

    .lesson-item {
        border-color: #4b5563;
    }

    .lesson-item:hover {
        background-color: #374151;
    }
}

/* Print Styles */
@media print {
    .navbar,
    .nav-btn,
    .btn,
    #btn-new-course,
    #btn-add-course,
    .form-actions,
    .lesson-actions {
        display: none;
    }

    body {
        background-color: white;
        color: black;
    }

    .main-content {
        padding: 0;
    }

    .view {
        page-break-inside: avoid;
    }

    .course-card,
    .stat-card,
    .lesson-item {
        page-break-inside: avoid;
        box-shadow: none;
        border: 1px solid #000;
    }
}