/* ================================================
   RESPONSIVE BREAKPOINTS
   ================================================ */

/* Mobile first approach with these breakpoints:
   - Mobile: 0-479px
   - Tablet: 480-767px  
   - Desktop: 768-1023px
   - Large: 1024px+
*/

/* ================================================
   EXTRA LARGE SCREENS (1200px+)
   ================================================ */

@media (min-width: 1200px) {
    .stats-grid {
        grid-template-columns: repeat(4, 1fr);
    }
    
    .page-content {
        max-width: 1400px;
        margin: 0 auto;
        padding: var(--spacing-2xl);
    }
    
    .sidebar {
        width: 320px;
    }
    
    .main-content {
        margin-left: 320px;
    }
}

/* ================================================
   LARGE SCREENS (1024px - 1199px)
   ================================================ */

@media (min-width: 1024px) and (max-width: 1199px) {
    .stats-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .sidebar {
        width: 280px;
    }
    
    .main-content {
        margin-left: 280px;
    }
}

/* ================================================
   TABLETS (768px - 1023px)
   ================================================ */

@media (min-width: 768px) and (max-width: 1023px) {
    .sidebar {
        width: 260px;
    }
    
    .main-content {
        margin-left: 260px;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .page-header {
        padding: var(--spacing-lg);
    }
    
    .page-content {
        padding: var(--spacing-lg);
    }
    
    .modal-content {
        max-width: 90vw;
        margin: var(--spacing-md);
    }
    
    .table-container {
        overflow-x: auto;
    }
    
    .form-row {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* ================================================
   MOBILE LANDSCAPE (640px - 767px)
   ================================================ */

@media (min-width: 640px) and (max-width: 767px) {
    .sidebar {
        transform: translateX(-100%);
        transition: transform var(--transition-slow);
        width: 280px;
        z-index: 1000;
    }
    
    .sidebar.mobile-open {
        transform: translateX(0);
    }
    
    .sidebar-toggle {
        display: block;
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .quick-actions {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .page-header {
        padding: var(--spacing-lg) var(--spacing-md);
        padding-top: 4rem;
    }
    
    .page-title {
        font-size: var(--font-size-2xl);
    }
}

/* ================================================
   MOBILE PORTRAIT (480px - 639px)
   ================================================ */

@media (min-width: 480px) and (max-width: 639px) {
    .sidebar {
        transform: translateX(-100%);
        transition: transform var(--transition-slow);
        width: 100%;
        z-index: 1000;
    }
    
    .sidebar.mobile-open {
        transform: translateX(0);
    }
    
    .sidebar-toggle {
        display: block;
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .quick-actions {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);
    }
    
    .page-header {
        padding: var(--spacing-md);
        padding-top: 3.5rem;
    }
    
    .page-content {
        padding: var(--spacing-md);
    }
    
    .modal-content {
        max-width: 95vw;
        margin: var(--spacing-sm);
        max-height: 95vh;
    }
    
    .modal-body {
        padding: var(--spacing-md);
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .table-container {
        font-size: var(--font-size-xs);
    }
    
    .table th,
    .table td {
        padding: var(--spacing-sm);
    }
    
    .btn {
        width: 100%;
        margin-bottom: var(--spacing-xs);
    }
    
    .btn + .btn {
        margin-left: 0;
    }
}

/* ================================================
   SMALL MOBILE (320px - 479px)
   ================================================ */

@media (max-width: 479px) {
    .sidebar {
        transform: translateX(-100%);
        transition: transform var(--transition-slow);
        width: 100%;
        z-index: 1000;
    }
    
    .sidebar.mobile-open {
        transform: translateX(0);
    }
    
    .sidebar-toggle {
        display: block;
        top: var(--spacing-sm);
        left: var(--spacing-sm);
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);
    }
    
    .stat-card {
        padding: var(--spacing-md);
    }
    
    .stat-value {
        font-size: var(--font-size-2xl);
    }
    
    .quick-actions {
        grid-template-columns: 1fr;
        gap: var(--spacing-xs);
    }
    
    .quick-action {
        padding: var(--spacing-md);
    }
    
    .page-header {
        padding: var(--spacing-sm);
        padding-top: 3rem;
    }
    
    .page-title {
        font-size: var(--font-size-xl);
    }
    
    .page-subtitle {
        font-size: var(--font-size-xs);
    }
    
    .page-content {
        padding: var(--spacing-sm);
    }
    
    .modal-content {
        max-width: 100vw;
        max-height: 100vh;
        margin: 0;
        border-radius: 0;
    }
    
    .modal-header,
    .modal-body,
    .modal-footer {
        padding: var(--spacing-sm);
    }
    
    .form-group {
        margin-bottom: var(--spacing-sm);
    }
    
    .form-input,
    .form-textarea {
        padding: var(--spacing-sm);
        font-size: var(--font-size-base);
    }
    
    .table-container {
        font-size: var(--font-size-xs);
        overflow-x: auto;
    }
    
    .table th,
    .table td {
        padding: var(--spacing-xs);
        white-space: nowrap;
    }
    
    .user-info {
        position: relative;
        padding: var(--spacing-sm);
    }
    
    .nav-item {
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: var(--font-size-base);
    }
}

/* ================================================
   LANDSCAPE ORIENTATION
   ================================================ */

@media (orientation: landscape) and (max-height: 600px) {
    .sidebar {
        height: 100vh;
        overflow-y: auto;
    }
    
    .user-info {
        position: relative;
        margin-top: var(--spacing-md);
    }
    
    .loading-screen {
        min-height: 100vh;
    }
}

/* ================================================
   HIGH DPI DISPLAYS
   ================================================ */

@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
    .logo::before {
        font-size: 1.25rem;
    }
    
    .stat-icon {
        font-size: var(--font-size-lg);
    }
}

/* ================================================
   PRINT STYLES
   ================================================ */

@media print {
    .sidebar,
    .sidebar-toggle,
    .debug-panel,
    .debug-toggle,
    .modal,
    .loading-screen {
        display: none !important;
    }
    
    .main-content {
        margin-left: 0;
        padding: 0;
    }
    
    .page-header {
        border-bottom: 2px solid #000;
        margin-bottom: var(--spacing-md);
    }
    
    .page-content {
        padding: 0;
    }
    
    .btn {
        display: none;
    }
    
    .table {
        border-collapse: collapse;
    }
    
    .table th,
    .table td {
        border: 1px solid #000;
    }
    
    .card,
    .stat-card {
        border: 1px solid #000;
        break-inside: avoid;
    }
}

/* ================================================
   ACCESSIBILITY & MOTION
   ================================================ */

@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    .sidebar {
        transition: none;
    }
    
    .spinner {
        animation: none;
        border: 3px solid var(--primary-color);
    }
}

@media (prefers-contrast: high) {
    .sidebar {
        border-right: 3px solid var(--text-primary);
    }
    
    .nav-item.active {
        border: 2px solid white;
        outline: 2px solid var(--text-primary);
    }
    
    .btn {
        border: 2px solid currentColor;
    }
    
    .card,
    .stat-card,
    .table-container {
        border: 2px solid var(--text-primary);
    }
}

/* ================================================
   DARK MODE SUPPORT (if implemented)
   ================================================ */

@media (prefers-color-scheme: dark) {
    /* Dark mode variables would go here if implemented */
    /* For now, we'll keep the light theme */
}

/* ================================================
   CONTAINER QUERIES (Future-proofing)
   ================================================ */

/* When container queries are fully supported */
@supports (container-type: inline-size) {
    .responsive-container {
        container-type: inline-size;
    }
    
    @container (max-width: 400px) {
        .stats-grid {
            grid-template-columns: 1fr;
        }
    }
    
    @container (min-width: 600px) {
        .stats-grid {
            grid-template-columns: repeat(2, 1fr);
        }
    }
}

/* ================================================
   TOUCH DEVICE OPTIMIZATIONS
   ================================================ */

@media (hover: none) and (pointer: coarse) {
    /* Touch devices */
    .btn,
    .nav-item,
    .quick-action {
        min-height: 44px; /* Apple's recommended touch target */
        min-width: 44px;
    }
    
    .table td,
    .table th {
        padding: var(--spacing-md);
    }
    
    .modal-close {
        min-height: 44px;
        min-width: 44px;
    }
    
    .sidebar-toggle {
        min-height: 44px;
        min-width: 44px;
    }
}

/* ================================================
   KEYBOARD NAVIGATION
   ================================================ */

@media (hover: none) {
    .nav-item:focus,
    .btn:focus,
    .form-input:focus {
        outline: 3px solid var(--primary-color);
        outline-offset: 2px;
    }
}

/* ================================================
   RESPONSIVE TYPOGRAPHY
   ================================================ */

@media (max-width: 480px) {
    html {
        font-size: 14px; /* Slightly smaller base font size */
    }
    
    .page-title {
        line-height: 1.1;
    }
    
    .stat-value {
        line-height: 1;
    }
}

@media (min-width: 1200px) {
    html {
        font-size: 16px; /* Standard base font size */
    }
}

/* ================================================
   RESPONSIVE SPACING
   ================================================ */

@media (max-width: 768px) {
    :root {
        --spacing-xs: 0.125rem;
        --spacing-sm: 0.375rem;
        --spacing-md: 0.75rem;
        --spacing-lg: 1rem;
        --spacing-xl: 1.25rem;
        --spacing-2xl: 1.5rem;
    }
}

@media (min-width: 1200px) {
    :root {
        --spacing-xs: 0.375rem;
        --spacing-sm: 0.625rem;
        --spacing-md: 1.25rem;
        --spacing-lg: 2rem;
        --spacing-xl: 2.5rem;
        --spacing-2xl: 4rem;
    }
}

/* ================================================
   FOLDABLE DEVICES
   ================================================ */

@media (spanning: single-fold-vertical) {
    .main-content {
        display: flex;
        flex-direction: row;
    }
    
    .page-content {
        flex: 1;
    }
}

/* ================================================
   RESPONSIVE IMAGES & MEDIA
   ================================================ */

img,
video {
    max-width: 100%;
    height: auto;
}

.responsive-embed {
    position: relative;
    padding-bottom: 56.25%; /* 16:9 aspect ratio */
    height: 0;
    overflow: hidden;
}

.responsive-embed iframe,
.responsive-embed video {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

/* ================================================
   PERFORMANCE OPTIMIZATIONS
   ================================================ */

@media (max-width: 768px) {
    /* Reduce shadows and effects on mobile for better performance */
    .stat-card,
    .card,
    .modal-content {
        box-shadow: var(--shadow);
    }
    
    .stat-card:hover,
    .card:hover {
        transform: none;
        box-shadow: var(--shadow);
    }
}

/* ================================================
   LANDSCAPE PHONE SPECIFIC
   ================================================ */

@media (max-width: 896px) and (orientation: landscape) and (max-height: 414px) {
    .page-header {
        padding: var(--spacing-sm) var(--spacing-md);
        padding-top: 2.5rem;
    }
    
    .page-title {
        font-size: var(--font-size-lg);
        margin-bottom: var(--spacing-xs);
    }
    
    .page-subtitle {
        font-size: var(--font-size-xs);
    }
    
    .sidebar-toggle {
        top: var(--spacing-xs);
        left: var(--spacing-xs);
        padding: var(--spacing-xs);
    }
}

/* ================================================
   RESPONSIVE DEBUG PANEL
   ================================================ */

@media (max-width: 768px) {
    .debug-panel {
        right: var(--spacing-xs);
        left: var(--spacing-xs);
        top: 3rem;
        max-width: none;
        font-size: var(--font-size-xs);
    }
    
    .debug-toggle {
        top: var(--spacing-xs);
        right: var(--spacing-xs);
        padding: var(--spacing-xs);
        font-size: var(--font-size-xs);
    }
}