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

/* Mobile First Approach - Base styles are for mobile, then scale up */

/* Extra Small Devices (phones, 576px and down) */
@media (max-width: 575.98px) {
  .container {
    padding: 0 var(--space-3);
  }
  
  .utility-bar {
    padding: var(--space-1) 0;
  }
  
  .utility-bar .container {
    flex-direction: column;
    gap: var(--space-1);
  }
  
  .header-main .container {
    grid-template-columns: 1fr auto;
    gap: var(--space-2);
  }
  
  .site-title {
    font-size: var(--font-size-base);
  }
  
  .main-content-area {
    padding: var(--space-4);
    margin: var(--space-3) 0;
  }
  
  .content-wrapper {
    gap: var(--space-4);
  }
  
  .sidebar-widget {
    padding: var(--space-3);
  }
  
  .nav-menu {
    padding: var(--space-4) 0;
  }
  
  .nav-link {
    padding: var(--space-3) var(--space-4);
    font-size: var(--font-size-sm);
  }
  
  .search-container {
    margin-top: var(--space-2);
  }
  
  .footer-content {
    grid-template-columns: 1fr;
    gap: var(--space-4);
    text-align: center;
  }
  
  .footer-bottom {
    flex-direction: column;
    gap: var(--space-3);
    text-align: center;
  }
}

/* Small Devices (landscape phones, 576px and up) */
@media (min-width: 576px) and (max-width: 767.98px) {
  .container {
    padding: 0 var(--space-4);
  }
  
  .header-main .container {
    grid-template-columns: auto 1fr auto;
    gap: var(--space-3);
  }
  
  .main-content-area {
    padding: var(--space-6);
  }
  
  .sidebar-widget {
    padding: var(--space-4);
  }
  
  .footer-content {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-6);
  }
}

/* Medium Devices (tablets, 768px and up) */
@media (min-width: 768px) and (max-width: 991.98px) {
  .container {
    padding: 0 var(--space-6);
  }
  
  .utility-bar .container {
    flex-direction: row;
    justify-content: space-between;
  }
  
  .header-main .container {
    grid-template-columns: auto 1fr auto auto;
    gap: var(--space-4);
  }
  
  .desktop-search {
    display: block;
    max-width: 300px;
  }
  
  .mobile-menu-toggle {
    display: block;
  }
  
  .main-navigation {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
  }
  
  .content-wrapper {
    grid-template-columns: 2fr 1fr;
    gap: var(--space-6);
  }
  
  .sidebar {
    order: 0;
  }
  
  .main-content-area {
    padding: var(--space-8);
  }
  
  .nav-menu {
    flex-direction: column;
    padding: var(--space-6) 0;
  }
  
  .footer-content {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-8);
  }
  
  .footer-bottom {
    flex-direction: row;
    justify-content: space-between;
  }
}

/* Large Devices (desktops, 992px and up) */
@media (min-width: 992px) and (max-width: 1199.98px) {
  .header-main .container {
    grid-template-columns: auto 1fr auto;
    gap: var(--space-6);
  }
  
  .desktop-search {
    display: block;
    max-width: 400px;
  }
  
  .mobile-search {
    display: none;
  }
  
  .mobile-menu-toggle {
    display: none;
  }
  
  .main-navigation {
    position: static;
    background: none;
    transform: none;
    opacity: 1;
    visibility: visible;
    border: none;
    backdrop-filter: none;
    box-shadow: none;
  }
  
  .nav-menu {
    flex-direction: row;
    gap: var(--space-2);
    padding: 0;
  }
  
  .nav-link {
    padding: var(--space-3) var(--space-4);
    border-radius: var(--radius-lg);
    border-left: none;
    border-bottom: 3px solid transparent;
  }
  
  .nav-link:hover,
  .nav-item.active .nav-link {
    border-left-color: transparent;
    border-bottom-color: var(--accent-color);
    transform: translateY(-2px);
  }
  
  .content-wrapper {
    grid-template-columns: 1fr var(--sidebar-width);
    gap: var(--space-8);
  }
  
  .sidebar {
    order: 1;
  }
  
  .footer-content {
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-8);
  }
}

/* Extra Large Devices (large desktops, 1200px and up) */
@media (min-width: 1200px) {
  .container {
    max-width: var(--container-max-width);
  }
  
  .header-main .container {
    grid-template-columns: auto 1fr auto;
    gap: var(--space-8);
  }
  
  .desktop-search {
    max-width: 450px;
  }
  
  .main-content-area {
    padding: var(--space-10);
  }
  
  .nav-menu {
    gap: var(--space-3);
  }
  
  .content-wrapper {
    gap: var(--space-10);
  }
}

/* Ultra Wide Screens (1400px and up) */
@media (min-width: 1400px) {
  .container {
    max-width: 1320px;
  }
  
  .content-wrapper {
    gap: var(--space-12);
  }
  
  .main-content-area {
    padding: var(--space-12);
  }
}

/* Navigation Responsive Behavior */
@media (max-width: 1023px) {
  .main-navigation {
    background: rgba(26, 26, 46, 0.98);
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(12px);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
  }
  
  .main-navigation.active {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }
  
  .nav-menu {
    flex-direction: column;
    padding: var(--space-6) 0;
    max-height: calc(100vh - 200px);
    overflow-y: auto;
  }
  
  .nav-link {
    border-left: 3px solid transparent;
    border-bottom: none;
  }
  
  .nav-link:hover,
  .nav-item.active .nav-link {
    border-left-color: var(--accent-color);
    border-bottom-color: transparent;
    transform: translateX(4px);
  }
  
  .mobile-search {
    padding: var(--space-4);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
  }
}

/* Print Styles */
@media print {
  .site-header,
  .main-navigation,
  .search-container,
  .sidebar,
  .site-footer {
    display: none !important;
  }
  
  .main-content {
    margin-top: 0 !important;
  }
  
  .content-wrapper {
    grid-template-columns: 1fr !important;
  }
  
  .main-content-area {
    box-shadow: none !important;
    border: none !important;
    padding: 0 !important;
  }
  
  body {
    background: white !important;
    color: black !important;
    font-size: 12pt !important;
    line-height: 1.4 !important;
  }
  
  h1, h2, h3, h4, h5, h6 {
    page-break-after: avoid;
    color: black !important;
  }
  
  a {
    color: black !important;
    text-decoration: underline !important;
  }
  
  a[href]:after {
    content: " (" attr(href) ")";
    font-size: 0.8em;
    color: #666;
  }
}

/* High Contrast Mode */
@media (prefers-contrast: high) {
  .nav-link {
    border: 2px solid rgba(255, 255, 255, 0.5);
    margin-bottom: var(--space-1);
  }
  
  .search-input {
    border: 2px solid rgba(255, 255, 255, 0.7);
  }
  
  .mobile-menu-toggle {
    border: 2px solid rgba(255, 255, 255, 0.7);
  }
  
  .sidebar-widget {
    border: 2px solid var(--border-primary);
  }
  
  .quick-nav-link {
    border: 2px solid var(--border-primary);
  }
}

/* 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;
  }
  
  .nav-link,
  .search-input,
  .mobile-menu-toggle,
  .hamburger span,
  .quick-nav-link,
  .sidebar-widget {
    transition-duration: 0.1s;
  }
  
  .nav-link::before,
  .quick-nav-link::before {
    display: none;
  }
  
  .nav-link:hover .nav-icon,
  .quick-nav-link:hover .nav-icon {
    transform: none;
  }
  
  .progress-fill::after {
    animation: none;
  }
}

/* Dark Mode Adjustments */
@media (prefers-color-scheme: dark) {
  [data-theme="auto"] {
    .search-input {
      background: rgba(255, 255, 255, 0.05);
      border-color: rgba(255, 255, 255, 0.15);
    }
    
    .search-input:focus {
      background: rgba(255, 255, 255, 0.1);
    }
  }
}

/* Touch Device Optimizations */
@media (hover: none) and (pointer: coarse) {
  .nav-link,
  .quick-nav-link,
  .search-button,
  .mobile-menu-toggle,
  .theme-toggle {
    min-height: 44px;
    min-width: 44px;
  }
  
  .nav-link {
    padding: var(--space-4);
  }
  
  .quick-nav-link {
    padding: var(--space-4);
  }
  
  .search-input {
    padding: var(--space-4);
    font-size: 16px; /* Prevents zoom on iOS */
  }
  
  .mobile-menu-toggle {
    padding: var(--space-3);
  }
}

/* Landscape Phone Adjustments */
@media screen and (max-height: 500px) and (orientation: landscape) {
  .main-navigation {
    max-height: calc(100vh - 120px);
    overflow-y: auto;
  }
  
  .nav-menu {
    padding: var(--space-3) 0;
  }
  
  .nav-link {
    padding: var(--space-2) var(--space-4);
  }
}

/* Container Queries (Progressive Enhancement) */
@supports (container-type: inline-size) {
  .content-wrapper {
    container-type: inline-size;
  }
  
  @container (max-width: 768px) {
    .sidebar {
      order: -1;
    }
    
    .sidebar-widget {
      padding: var(--space-4);
    }
  }
  
  @container (min-width: 1024px) {
    .content-wrapper {
      grid-template-columns: 1fr 320px;
    }
  }
}

/* Focus Management */
.keyboard-navigation *:focus-visible {
  outline: 3px solid var(--accent-color);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* Loading States */
.loading .nav-link,
.loading .search-input,
.loading .quick-nav-link {
  pointer-events: none;
  opacity: 0.6;
}

/* Error States */
.error .nav-link {
  color: var(--error-color);
}

.error .search-input {
  border-color: var(--error-color);
}

/* Success States */
.success .nav-link {
  color: var(--success-color);
}

/* Animation Utilities */
.fade-in {
  animation: fadeIn 0.3s ease-in-out;
}

.slide-in-down {
  animation: slideInDown 0.3s ease-out;
}

.slide-in-up {
  animation: slideInUp 0.3s ease-out;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes slideInDown {
  from {
    transform: translateY(-20px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

@keyframes slideInUp {
  from {
    transform: translateY(20px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

/* Scroll Behavior */
html {
  scroll-padding-top: calc(var(--header-height) + var(--space-4));
}

/* Safe Area Insets for Devices with Notches */
@supports (padding: max(0px)) {
  .container {
    padding-left: max(var(--space-4), env(safe-area-inset-left));
    padding-right: max(var(--space-4), env(safe-area-inset-right));
  }
  
  .site-header {
    padding-top: env(safe-area-inset-top);
  }
}

/* Flexible Grid System */
.grid {
  display: grid;
  gap: var(--space-6);
}

.grid-cols-1 { grid-template-columns: 1fr; }
.grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
.grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
.grid-cols-4 { grid-template-columns: repeat(4, 1fr); }

@media (max-width: 767px) {
  .grid-cols-2,
  .grid-cols-3,
  .grid-cols-4 {
    grid-template-columns: 1fr;
  }
}

@media (min-width: 768px) and (max-width: 1023px) {
  .grid-cols-3,
  .grid-cols-4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* Utility Classes for Responsive Design */
.show-mobile { display: none; }
.show-tablet { display: none; }
.show-desktop { display: block; }

@media (max-width: 767px) {
  .hide-mobile { display: none !important; }
  .show-mobile { display: block; }
}

@media (min-width: 768px) and (max-width: 1023px) {
  .hide-tablet { display: none !important; }
  .show-tablet { display: block; }
  .show-desktop { display: none; }
}

@media (min-width: 1024px) {
  .hide-desktop { display: none !important; }
  .show-mobile { display: none; }
  .show-tablet { display: none; }
}