/* ==========================================================================
   Mobile-First Responsive Design System
   Breakpoints: 475px (xs), 640px (sm), 768px (md), 1024px (lg), 1280px (xl), 1536px (2xl)
   ========================================================================== */

/* ==========================================================================
   1. Mobile Base (0-474px)
   ========================================================================== */

/* Mobile Navigation */
@media (max-width: 767px) {
  /* Navigation */
  .nav-menu {
    position: fixed;
    top: 60px;
    left: -100%;
    width: 100%;
    height: calc(100vh - 60px);
    background-color: var(--color-surface);
    flex-direction: column;
    padding: var(--space-6);
    gap: var(--space-4);
    transition: left var(--duration-300) var(--ease-in-out);
    z-index: var(--z-dropdown);
    box-shadow: var(--shadow-xl);
    overflow-y: auto;
  }
  
  .nav-menu.active {
    left: 0;
  }
  
  .nav-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    padding: 0;
    background: transparent;
    border: none;
    cursor: pointer;
  }
  
  .nav-link {
    display: block;
    padding: var(--space-3) var(--space-4);
    font-size: var(--font-size-base);
  }
  
  /* Mobile Typography */
  h1, .h1 {
    font-size: clamp(1.75rem, 6vw, var(--font-size-3xl));
  }
  
  h2, .h2 {
    font-size: clamp(1.5rem, 5vw, var(--font-size-2xl));
  }
  
  h3, .h3 {
    font-size: clamp(1.25rem, 4vw, var(--font-size-xl));
  }
  
  /* Mobile Spacing */
  .section {
    padding-top: var(--space-12);
    padding-bottom: var(--space-12);
  }
  
  .container {
    padding-left: var(--space-4);
    padding-right: var(--space-4);
  }
  
  /* Mobile Cards */
  .card {
    padding: var(--space-4);
  }
  
  .card-large {
    padding: var(--space-6);
  }
  
  /* Mobile Buttons */
  .btn {
    width: 100%;
    justify-content: center;
    padding: var(--space-4) var(--space-6);
    min-height: 44px; /* Touch target size */
  }
  
  .btn-group {
    flex-direction: column;
    gap: var(--space-3);
  }
  
  /* Mobile Forms */
  .form-row {
    grid-template-columns: 1fr;
  }
  
  .form-input,
  .form-textarea,
  .form-select {
    font-size: 16px; /* Prevent zoom on iOS */
    min-height: 44px;
  }
  
  /* Mobile Tables */
  .table-responsive {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }
  
  .dashboard-table {
    min-width: 600px;
  }
  
  /* Mobile Modals */
  .modal {
    width: 95%;
    max-width: none;
    margin: var(--space-4);
  }
  
  /* Mobile Grid */
  .grid {
    grid-template-columns: 1fr;
  }
  
  /* Hide desktop-only elements */
  .desktop-only {
    display: none !important;
  }
}

/* ==========================================================================
   2. Extra Small Tablets (475px-639px)
   ========================================================================== */

@media (min-width: 475px) and (max-width: 639px) {
  .container {
    padding-left: var(--space-6);
    padding-right: var(--space-6);
  }
  
  .grid-xs-2 {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .btn {
    width: auto;
  }
  
  .btn-group {
    flex-direction: row;
    flex-wrap: wrap;
  }
}

/* ==========================================================================
   3. Small Tablets (640px-767px)
   ========================================================================== */

@media (min-width: 640px) {
  /* Typography adjustments */
  h1, .h1 {
    font-size: var(--font-size-3xl);
  }
  
  h2, .h2 {
    font-size: var(--font-size-2xl);
  }
  
  h3, .h3 {
    font-size: var(--font-size-xl);
  }
  
  /* Grid System */
  .sm\:grid-cols-2 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  
  .sm\:col-span-2 {
    grid-column: span 2 / span 2;
  }
  
  /* Flexbox */
  .sm\:flex-row {
    flex-direction: row;
  }
  
  .sm\:flex-wrap {
    flex-wrap: wrap;
  }
  
  /* Display */
  .sm\:block {
    display: block !important;
  }
  
  .sm\:hidden {
    display: none !important;
  }
  
  .sm\:inline-block {
    display: inline-block !important;
  }
  
  /* Spacing */
  .sm\:px-6 {
    padding-left: var(--space-6);
    padding-right: var(--space-6);
  }
  
  .sm\:py-8 {
    padding-top: var(--space-8);
    padding-bottom: var(--space-8);
  }
  
  /* Text Alignment */
  .sm\:text-left {
    text-align: left;
  }
  
  .sm\:text-center {
    text-align: center;
  }
}

/* ==========================================================================
   4. Medium Tablets / Small Laptops (768px-1023px)
   ========================================================================== */

@media (min-width: 768px) {
  /* Show desktop navigation */
  .nav-toggle {
    display: none;
  }
  
  .nav-menu {
    position: static;
    width: auto;
    height: auto;
    flex-direction: row;
    padding: 0;
    background: transparent;
    box-shadow: none;
  }
  
  /* Grid System */
  .md\:grid-cols-2 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  
  .md\:grid-cols-3 {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  
  .md\:col-span-2 {
    grid-column: span 2 / span 2;
  }
  
  /* Flexbox */
  .md\:flex-row {
    flex-direction: row;
  }
  
  .md\:flex-nowrap {
    flex-wrap: nowrap;
  }
  
  /* Display */
  .md\:block {
    display: block !important;
  }
  
  .md\:hidden {
    display: none !important;
  }
  
  .md\:inline-flex {
    display: inline-flex !important;
  }
  
  /* Spacing */
  .md\:px-8 {
    padding-left: var(--space-8);
    padding-right: var(--space-8);
  }
  
  .md\:py-12 {
    padding-top: var(--space-12);
    padding-bottom: var(--space-12);
  }
  
  /* Width */
  .md\:w-1\/2 {
    width: 50%;
  }
  
  .md\:w-2\/3 {
    width: 66.666667%;
  }
  
  .md\:max-w-2xl {
    max-width: 42rem;
  }
  
  /* Mobile-only elements */
  .mobile-only {
    display: none !important;
  }
}

/* ==========================================================================
   5. Large Screens / Desktops (1024px-1279px)
   ========================================================================== */

@media (min-width: 1024px) {
  /* Grid System */
  .lg\:grid-cols-3 {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  
  .lg\:grid-cols-4 {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  
  .lg\:col-span-2 {
    grid-column: span 2 / span 2;
  }
  
  .lg\:col-span-3 {
    grid-column: span 3 / span 3;
  }
  
  /* Display */
  .lg\:block {
    display: block !important;
  }
  
  .lg\:hidden {
    display: none !important;
  }
  
  .lg\:flex {
    display: flex !important;
  }
  
  /* Spacing */
  .lg\:px-12 {
    padding-left: var(--space-12);
    padding-right: var(--space-12);
  }
  
  .lg\:py-16 {
    padding-top: var(--space-16);
    padding-bottom: var(--space-16);
  }
  
  /* Width */
  .lg\:w-1\/3 {
    width: 33.333333%;
  }
  
  .lg\:w-1\/4 {
    width: 25%;
  }
  
  .lg\:max-w-4xl {
    max-width: 56rem;
  }
  
  /* Containers */
  .section {
    padding-top: var(--space-16);
    padding-bottom: var(--space-16);
  }
  
  .section-lg {
    padding-top: var(--space-24);
    padding-bottom: var(--space-24);
  }
}

/* ==========================================================================
   6. Extra Large Screens (1280px-1535px)
   ========================================================================== */

@media (min-width: 1280px) {
  /* Grid System */
  .xl\:grid-cols-4 {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  
  .xl\:grid-cols-5 {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
  
  /* Display */
  .xl\:block {
    display: block !important;
  }
  
  .xl\:hidden {
    display: none !important;
  }
  
  /* Width */
  .xl\:max-w-5xl {
    max-width: 64rem;
  }
  
  .xl\:max-w-6xl {
    max-width: 72rem;
  }
}

/* ==========================================================================
   7. 2XL Screens (1536px+)
   ========================================================================== */

@media (min-width: 1536px) {
  /* Grid System */
  .\32xl\:grid-cols-6 {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }
  
  /* Width */
  .\32xl\:max-w-7xl {
    max-width: 80rem;
  }
}

/* ==========================================================================
   8. Touch Device Optimizations
   ========================================================================== */

@media (hover: none) and (pointer: coarse) {
  /* Increase touch targets */
  .btn,
  .nav-link,
  .form-input,
  .form-select,
  .form-textarea {
    min-height: 44px;
  }
  
  /* Remove hover effects on touch devices */
  .card:hover,
  .btn:hover {
    transform: none;
  }
  
  /* Improve scrolling */
  * {
    -webkit-tap-highlight-color: transparent;
  }
  
  /* Optimize for touch scrolling */
  .scroll-container {
    -webkit-overflow-scrolling: touch;
    scroll-snap-type: x mandatory;
  }
  
  .scroll-item {
    scroll-snap-align: start;
  }
}

/* ==========================================================================
   9. Print Styles
   ========================================================================== */

@media print {
  /* Hide unnecessary elements */
  .nav,
  .footer,
  .btn,
  .no-print,
  .nav-toggle,
  .theme-toggle,
  .toast-container {
    display: none !important;
  }
  
  /* Reset colors for print */
  * {
    color: #000 !important;
    background: #fff !important;
  }
  
  /* Optimize layout */
  .container {
    max-width: 100%;
    padding: 0;
  }
  
  /* Ensure content breaks properly */
  .card,
  .section {
    page-break-inside: avoid;
  }
  
  h1, h2, h3, h4, h5, h6 {
    page-break-after: avoid;
  }
  
  /* Show link URLs */
  a[href]:after {
    content: " (" attr(href) ")";
  }
}

/* ==========================================================================
   10. Accessibility Responsive Adjustments
   ========================================================================== */

/* High Contrast Mode */
@media (prefers-contrast: high) {
  .card {
    border-width: 2px;
  }
  
  .btn {
    border-width: 2px;
  }
  
  .form-input,
  .form-select,
  .form-textarea {
    border-width: 2px;
  }
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  
  .nav-menu {
    transition: none;
  }
}

/* Dark Mode Adjustments */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --color-background: var(--color-neutral-950);
    --color-surface: var(--color-neutral-900);
    --color-text-primary: var(--color-neutral-50);
    --color-text-secondary: var(--color-neutral-400);
  }
}

/* ==========================================================================
   11. Orientation-Specific Styles
   ========================================================================== */

/* Landscape phones */
@media (max-width: 767px) and (orientation: landscape) {
  .nav {
    position: fixed;
    top: 0;
    z-index: var(--z-fixed);
  }
  
  main {
    margin-top: 60px;
  }
  
  .hero {
    min-height: calc(100vh - 60px);
  }
  
  .modal {
    max-height: 90vh;
    overflow-y: auto;
  }
}

/* Portrait tablets */
@media (min-width: 768px) and (max-width: 1023px) and (orientation: portrait) {
  .grid-md-2 {
    grid-template-columns: 1fr;
  }
  
  .template-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}