/* Mobile First Responsive Design - Enhanced Enterprise Edition */

/* CSS Custom Properties for Responsive Breakpoints */
:root {
  --mobile-max: 767px;
  --tablet-min: 768px;
  --tablet-max: 1919px;
  --desktop-min: 1920px;
  --container-mobile: 100%;
  --container-tablet: 768px;
  --container-desktop: 1400px;
}

/* Base Mobile Styles (320px - 767px) */
@media (max-width: 767px) {
  .container {
    max-width: var(--container-mobile);
    padding: 0 var(--spacing-sm);
  }
  
  /* Enhanced Navigation Mobile */
  .nav {
    padding: var(--spacing-sm) 0;
  }
  
  .nav .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
  }
  
  .nav-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(20px);
    flex-direction: column;
    box-shadow: var(--shadow-lg);
    border-top: 1px solid var(--gray-200);
    padding: var(--spacing-md) 0;
    z-index: 1000;
  }
  
  .nav-menu.active {
    display: flex;
    animation: slideInFromTop 0.3s ease-out;
  }
  
  .nav-menu li {
    width: 100%;
  }
  
  .nav-link {
    display: block;
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: 1px solid var(--gray-100);
    text-align: center;
  }
  
  .nav-toggle {
    display: flex;
  }
  
  /* Hero Mobile Optimizations */
  .hero {
    padding: var(--spacing-2xl) 0;
    min-height: 60vh;
    text-align: center;
  }
  
  .hero-title {
    font-size: var(--font-size-3xl);
    line-height: 1.1;
    margin-bottom: var(--spacing-lg);
  }
  
  .hero-subtitle {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-xl);
    padding: 0 var(--spacing-sm);
  }
  
  .hero-cta {
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
  }
  
  .hero-cta .btn {
    width: 100%;
    max-width: 280px;
    padding: var(--spacing-lg) var(--spacing-xl);
  }
  
  /* Cards Mobile Layout */
  .card {
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
  }
  
  .card-header {
    flex-direction: column;
    text-align: center;
    gap: var(--spacing-sm);
  }
  
  .card-title {
    font-size: var(--font-size-lg);
  }
  
  /* Grid System Mobile */
  .grid-2,
  .grid-3,
  .grid-4 {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }
  
  /* Tabs Mobile */
  .tab-list {
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    justify-content: center;
  }
  
  .tab-button {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-sm);
    min-width: auto;
    flex: 1;
    text-align: center;
  }
  
  .tab-content {
    padding: var(--spacing-lg) 0;
  }
  
  /* Form Mobile Optimizations */
  .form-group {
    margin-bottom: var(--spacing-md);
  }
  
  .form-input,
  .form-select,
  .form-textarea {
    padding: var(--spacing-md);
    font-size: var(--font-size-base);
  }
  
  /* Section Spacing Mobile */
  .section {
    padding: var(--spacing-2xl) 0;
  }
  
  /* Typography Mobile */
  h1 { font-size: var(--font-size-3xl); }
  h2 { font-size: var(--font-size-2xl); }
  h3 { font-size: var(--font-size-xl); }
  h4 { font-size: var(--font-size-lg); }
  
  /* Metrics Mobile */
  .metric {
    padding: var(--spacing-md);
  }
  
  .metric h3 {
    font-size: var(--font-size-2xl);
  }
  
  /* Trust Badges Mobile */
  .trust-badges {
    gap: var(--spacing-md);
    padding: var(--spacing-lg) 0;
  }
  
  .trust-badge {
    height: 32px;
  }
  
  /* Diagram Images Mobile */
  .diagram-image {
    max-width: 100%;
    margin: var(--spacing-lg) auto;
  }
  
  /* Animation Adjustments Mobile */
  .animate-on-scroll {
    transform: translateY(20px);
  }
  
  .float-element {
    animation-duration: 6s;
  }
  
  /* Glassmorphism Mobile Optimization */
  .glass-effect {
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
  }
}

/* Tablet Styles (768px - 1919px) */
@media (min-width: 768px) and (max-width: 1919px) {
  .container {
    max-width: var(--container-tablet);
    padding: 0 var(--spacing-lg);
  }
  
  /* Navigation Tablet */
  .nav-toggle {
    display: none;
  }
  
  .nav-menu {
    display: flex;
    position: static;
    background: transparent;
    box-shadow: none;
    flex-direction: row;
    padding: 0;
  }
  
  .nav-link {
    padding: var(--spacing-sm) var(--spacing-md);
    border-bottom: none;
  }
  
  /* Hero Tablet */
  .hero {
    padding: var(--spacing-3xl) 0;
    min-height: 70vh;
  }
  
  .hero-title {
    font-size: var(--font-size-4xl);
    margin-bottom: var(--spacing-xl);
  }
  
  .hero-subtitle {
    font-size: var(--font-size-xl);
    max-width: 600px;
    margin: 0 auto var(--spacing-2xl);
  }
  
  .hero-cta {
    flex-direction: row;
    gap: var(--spacing-xl);
    justify-content: center;
  }
  
  /* Grid Layouts Tablet */
  .grid-2 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
  }
  
  .grid-3 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
  }
  
  .grid-3 .card:nth-child(3) {
    grid-column: 1 / -1;
    max-width: 50%;
    margin: 0 auto;
  }
  
  .grid-4 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
  }
  
  /* Cards Tablet */
  .card {
    padding: var(--spacing-xl);
  }
  
  .card-header {
    flex-direction: row;
    text-align: left;
  }
  
  /* Tabs Tablet */
  .tab-list {
    flex-wrap: nowrap;
    gap: var(--spacing-md);
    justify-content: flex-start;
  }
  
  .tab-button {
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: var(--font-size-base);
    white-space: nowrap;
  }
  
  /* Section Spacing Tablet */
  .section {
    padding: var(--spacing-3xl) 0;
  }
  
  /* Typography Tablet */
  h1 { font-size: var(--font-size-4xl); }
  h2 { font-size: var(--font-size-3xl); }
  h3 { font-size: var(--font-size-2xl); }
  
  /* Form Tablet Layout */
  .form-group {
    margin-bottom: var(--spacing-lg);
  }
  
  /* Two-column form layout for tablet */
  .form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
  }
  
  /* Trust Badges Tablet */
  .trust-badges {
    gap: var(--spacing-xl);
    padding: var(--spacing-xl) 0;
  }
  
  .trust-badge {
    height: 40px;
  }
}

/* Desktop Styles (1920px+) */
@media (min-width: 1920px) {
  .container {
    max-width: var(--container-desktop);
    padding: 0 var(--spacing-xl);
  }
  
  /* Hero Desktop */
  .hero {
    padding: var(--spacing-3xl) 0;
    min-height: 80vh;
  }
  
  .hero-title {
    font-size: var(--font-size-5xl);
    margin-bottom: var(--spacing-2xl);
  }
  
  .hero-subtitle {
    font-size: var(--font-size-2xl);
    max-width: 800px;
    margin: 0 auto var(--spacing-2xl);
  }
  
  /* Enhanced Desktop Grid Layouts */
  .grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xl);
  }
  
  .grid-4 {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-xl);
  }
  
  /* Advanced Grid Layouts for Desktop */
  .grid-auto-fit {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
  }
  
  .grid-subgrid {
    display: subgrid;
    gap: var(--spacing-lg);
  }
  
  /* Cards Desktop Enhancement */
  .card {
    padding: var(--spacing-2xl);
    transition: all var(--transition-normal);
  }
  
  .card:hover {
    transform: translateY(-8px) scale(1.02);
  }
  
  /* Navigation Desktop Enhancement */
  .nav {
    padding: var(--spacing-lg) 0;
  }
  
  .nav-menu {
    gap: var(--spacing-2xl);
  }
  
  /* Typography Desktop */
  h1 { font-size: var(--font-size-5xl); }
  h2 { font-size: var(--font-size-4xl); }
  h3 { font-size: var(--font-size-3xl); }
  
  /* Advanced Layout Features */
  .masonry {
    columns: 3;
    column-gap: var(--spacing-xl);
  }
  
  .masonry .card {
    break-inside: avoid;
    margin-bottom: var(--spacing-xl);
  }
  
  /* Enhanced Parallax for Desktop */
  .parallax-container {
    height: 100vh;
    overflow-x: hidden;
    overflow-y: auto;
    perspective: 1px;
  }
  
  .parallax-layer {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
  }
  
  .parallax-back {
    transform: translateZ(-1px) scale(2);
  }
  
  .parallax-base {
    transform: translateZ(0);
  }
}

/* Utility Responsive Classes */
.mobile-only {
  display: block;
}

.tablet-only {
  display: none;
}

.desktop-only {
  display: none;
}

@media (min-width: 768px) {
  .mobile-only {
    display: none;
  }
  
  .tablet-only {
    display: block;
  }
}

@media (min-width: 1920px) {
  .tablet-only {
    display: none;
  }
  
  .desktop-only {
    display: block;
  }
}

/* Responsive Typography Scale */
@media (max-width: 767px) {
  :root {
    --font-size-5xl: 2.25rem;
    --font-size-4xl: 1.875rem;
    --font-size-3xl: 1.5rem;
    --font-size-2xl: 1.25rem;
    --font-size-xl: 1.125rem;
  }
}

@media (min-width: 768px) and (max-width: 1919px) {
  :root {
    --font-size-5xl: 2.75rem;
    --font-size-4xl: 2.25rem;
    --font-size-3xl: 1.875rem;
    --font-size-2xl: 1.5rem;
  }
}

/* Responsive Spacing Scale */
@media (max-width: 767px) {
  :root {
    --spacing-3xl: 2.5rem;
    --spacing-2xl: 2rem;
    --spacing-xl: 1.5rem;
  }
}

/* Container Queries Support (Progressive Enhancement) */
@supports (container-type: inline-size) {
  .card-container {
    container-type: inline-size;
  }
  
  @container (min-width: 300px) {
    .card {
      padding: var(--spacing-lg);
    }
  }
  
  @container (min-width: 500px) {
    .card {
      padding: var(--spacing-xl);
    }
    
    .card-header {
      flex-direction: row;
    }
  }
}

/* Responsive Images and Media */
.responsive-media {
  position: relative;
  width: 100%;
  height: 0;
  padding-bottom: 56.25%; /* 16:9 aspect ratio */
  overflow: hidden;
}

.responsive-media img,
.responsive-media video {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* Responsive SVG Icons */
.icon-responsive {
  width: 1em;
  height: 1em;
  display: inline-block;
  vertical-align: middle;
}

@media (max-width: 767px) {
  .icon-responsive {
    width: 1.2em;
    height: 1.2em;
  }
}

/* Print Responsive Styles */
@media print {
  .mobile-only,
  .tablet-only,
  .desktop-only {
    display: block !important;
  }
  
  .nav,
  .hero-bg,
  .float-element {
    display: none !important;
  }
  
  .container {
    max-width: none !important;
    padding: 0 !important;
  }
  
  .section {
    padding: var(--spacing-lg) 0 !important;
  }
}

/* High DPI Display Support */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
  .hero-bg,
  .diagram-image {
    image-rendering: -webkit-optimize-contrast;
    image-rendering: crisp-edges;
  }
}

/* Landscape Orientation Adjustments */
@media (max-width: 767px) and (orientation: landscape) {
  .hero {
    min-height: 50vh;
    padding: var(--spacing-xl) 0;
  }
  
  .hero-title {
    font-size: var(--font-size-2xl);
  }
  
  .hero-subtitle {
    font-size: var(--font-size-base);
  }
}

/* Accessibility Responsive Enhancements */
@media (prefers-reduced-motion: reduce) {
  .animate-on-scroll,
  .float-element,
  .parallax {
    animation: none !important;
    transform: none !important;
    transition: none !important;
  }
}

@media (prefers-contrast: high) {
  .glass-effect {
    background: var(--white);
    backdrop-filter: none;
    border: 2px solid var(--gray-900);
  }
}

/* Touch Device Optimizations */
@media (hover: none) and (pointer: coarse) {
  .btn {
    min-height: 44px;
    min-width: 44px;
  }
  
  .nav-link {
    min-height: 44px;
    display: flex;
    align-items: center;
  }
  
  .tab-button {
    min-height: 44px;
  }
  
  .card:hover {
    transform: none;
  }
  
  .card:active {
    transform: scale(0.98);
  }
}

/* Reduced Data Mode */
@media (prefers-reduced-data: reduce) {
  .hero::before,
  .glass-effect,
  .parallax-back {
    display: none;
  }
  
  .hero {
    background: var(--primary-blue);
  }
}

/* Focus Management for Different Screen Sizes */
@media (max-width: 767px) {
  *:focus {
    outline-width: 3px;
    outline-offset: 3px;
  }
}

/* Performance Optimizations for Different Viewports */
@media (max-width: 767px) {
  .will-change-transform {
    will-change: auto;
  }
  
  .gpu-accelerated {
    transform: none;
  }
}

/* Responsive Grid Gap Adjustments */
@media (max-width: 480px) {
  .grid,
  .grid-2,
  .grid-3,
  .grid-4 {
    gap: var(--spacing-sm);
  }
}

@media (min-width: 481px) and (max-width: 767px) {
  .grid,
  .grid-2,
  .grid-3,
  .grid-4 {
    gap: var(--spacing-md);
  }
}

/* Responsive Form Layouts */
@media (min-width: 768px) {
  .form-inline {
    display: flex;
    gap: var(--spacing-md);
    align-items: end;
  }
  
  .form-inline .form-group {
    flex: 1;
    margin-bottom: 0;
  }
}

/* Responsive Modal Adjustments */
@media (max-width: 767px) {
  .modal {
    width: 95%;
    max-height: 95vh;
    padding: var(--spacing-lg);
  }
}

/* Responsive Navigation Enhancements */
@media (min-width: 768px) {
  .nav-menu {
    align-items: center;
  }
  
  .nav-link::after {
    bottom: -8px;
  }
}

/* Responsive Animation Performance */
@media (max-width: 767px) {
  .card:hover {
    transform: translateY(-2px);
  }
  
  .btn:hover {
    transform: translateY(-1px);
  }
}