/* Billix.ai Responsive Design */

/* Mobile First Approach */

/* Large Screens (1440px+) */
@media (min-width: 1440px) {
  .container {
    padding: 0 var(--spacing-2xl);
  }
  
  .hero-title {
    font-size: 56px;
  }
  
  .section-title {
    font-size: 42px;
  }
}

/* Desktop (1024px - 1439px) */
@media (max-width: 1439px) {
  .hero-content {
    gap: var(--spacing-2xl);
  }
  
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* Tablet Landscape (768px - 1023px) */
@media (max-width: 1023px) {
  .nav-container {
    padding: 12px var(--spacing-lg);
  }
  
  .nav-menu {
    gap: var(--spacing-lg);
  }
  
  .hero {
    padding: 100px 0 60px;
    min-height: auto;
  }
  
  .hero-content {
    grid-template-columns: 1fr;
    gap: var(--spacing-2xl);
    text-align: center;
  }
  
  .hero-cta {
    justify-content: center;
  }
  
  .phone-mockup {
    width: 240px;
    height: 480px;
  }
  
  .floating-card {
    font-size: 12px;
    padding: 8px 12px;
  }
  
  .card-1 {
    left: -10%;
  }
  
  .card-2 {
    right: -15%;
  }
  
  .card-3 {
    left: -5%;
  }
  
  .founders-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
  }
  
  .vision-transformation {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }
  
  .transformation-arrow {
    transform: rotate(90deg);
    margin: var(--spacing-md) 0;
  }
  
  .difference-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }
  
  .about-stats {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
  }
  
  /* How It Works */
  .workflow-diagram {
    flex-direction: column;
    gap: var(--spacing-md);
  }
  
  .workflow-arrow {
    transform: rotate(90deg);
    margin: var(--spacing-sm) 0;
  }
  
  .workflow-step {
    width: 280px;
    height: auto;
    min-height: 240px;
  }
  
  .problems-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
  }
  
  .process-stats {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }
  
  .contact-content {
    grid-template-columns: 1fr;
    gap: var(--spacing-2xl);
  }
  
  .footer-content {
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
  }
}

/* Tablet Portrait (640px - 767px) */
@media (max-width: 767px) {
  /* Navigation */
  .nav-menu {
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    background-color: var(--white);
    flex-direction: column;
    padding: var(--spacing-lg);
    box-shadow: 0 4px 20px var(--shadow-secondary);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
  }
  
  .nav-menu.active {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }
  
  .hamburger {
    display: flex;
  }
  
  .hamburger.active .bar:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
  }
  
  .hamburger.active .bar:nth-child(2) {
    opacity: 0;
  }
  
  .hamburger.active .bar:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
  }
  
  .language-toggle {
    order: -1;
  }
  
  /* Hero */
  .hero {
    padding: 80px 0 40px;
    text-align: center;
  }
  
  .hero-title {
    font-size: 32px;
    line-height: 1.2;
  }
  
  .hero-subtitle {
    font-size: 18px;
  }
  
  .hero-cta {
    flex-direction: column;
    align-items: center;
  }
  
  .phone-mockup {
    width: 200px;
    height: 400px;
    margin-top: var(--spacing-lg);
  }
  
  .floating-elements {
    display: none;
  }
  
  /* Problems */
  .problems-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }
  
  /* Features */
  .features-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }
  
  .feature-card {
    padding: var(--spacing-lg);
  }
  
  .feature-icon {
    width: 60px;
    height: 60px;
  }
  
  .feature-icon i {
    font-size: 24px;
  }
  
  /* Pricing */
  .pricing-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }
  
  .recommended {
    transform: none;
  }
  
  /* Stats */
  .about-stats {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }
  
  /* Footer */
  .footer-content {
    grid-template-columns: 1fr;
    text-align: center;
    gap: var(--spacing-lg);
  }
  
  .footer-bottom {
    flex-direction: column;
    gap: var(--spacing-md);
    text-align: center;
  }
}

/* Mobile Large (480px - 639px) */
@media (max-width: 639px) {
  .container {
    padding: 0 var(--spacing-md);
  }
  
  .hero-container {
    padding: 0 var(--spacing-md);
  }
  
  .hero-title {
    font-size: 28px;
  }
  
  .hero-subtitle {
    font-size: 16px;
  }
  
  .hero-cta .btn {
    width: 100%;
    max-width: 300px;
  }
  
  .section-title {
    font-size: 28px;
  }
  
  .section-subtitle {
    font-size: 16px;
  }
  
  .phone-mockup {
    width: 180px;
    height: 360px;
  }
  
  .contact-form {
    padding: var(--spacing-lg);
  }
  
  .contact-card {
    padding: var(--spacing-md);
  }
}

/* Mobile Small (320px - 479px) */
@media (max-width: 479px) {
  .nav-container {
    padding: 8px var(--spacing-md);
  }
  
  .hero {
    padding: 70px 0 30px;
  }
  
  .hero-title {
    font-size: 24px;
    line-height: 1.3;
  }
  
  .hero-subtitle {
    font-size: 14px;
  }
  
  .hero-features {
    gap: var(--spacing-sm);
  }
  
  .feature-point {
    font-size: 14px;
    gap: var(--spacing-sm);
  }
  
  .feature-point i {
    font-size: 14px;
  }
  
  .section-title {
    font-size: 24px;
  }
  
  .section-subtitle {
    font-size: 14px;
  }
  
  .feature-card {
    padding: var(--spacing-md);
  }
  
  .feature-title {
    font-size: 18px;
  }
  
  .feature-description {
    font-size: 14px;
  }
  
  .pricing-card {
    padding: var(--spacing-md);
  }
  
  .price {
    font-size: 28px;
  }
  
  .period {
    font-size: 14px;
  }
  
  .about-description {
    font-size: 16px;
  }
  
  .stat-number {
    font-size: 24px;
  }
  
  .stat-label {
    font-size: 12px;
  }
  
  .contact-form {
    padding: var(--spacing-md);
  }
  
  .btn {
    padding: 10px 20px;
    font-size: 14px;
  }
  
  .btn-large {
    padding: 14px 24px;
    font-size: 15px;
  }
}

/* High DPI / Retina Displays */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
  .phone-screen img {
    image-rendering: -webkit-optimize-contrast;
    image-rendering: crisp-edges;
  }
  
  .footer-logo,
  .nav-logo img {
    image-rendering: -webkit-optimize-contrast;
    image-rendering: crisp-edges;
  }
}

/* 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;
  }
  
  .floating-card {
    animation: none;
  }
  
  .fade-in,
  .slide-up {
    animation: none;
  }
}

/* Dark Mode Support */
@media (prefers-color-scheme: dark) {
  /* This can be extended later if dark mode is required */
  .phone-mockup {
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
  }
}

/* Print Styles */
@media print {
  * {
    background: transparent !important;
    color: black !important;
    box-shadow: none !important;
    text-shadow: none !important;
  }
  
  .navbar,
  .hamburger,
  .language-toggle,
  .hero-cta,
  .floating-elements,
  .footer-social {
    display: none !important;
  }
  
  a,
  a:visited {
    text-decoration: underline;
  }
  
  .hero {
    min-height: auto;
    padding: 20px 0;
  }
  
  .section {
    page-break-inside: avoid;
  }
  
  h1, h2, h3 {
    page-break-after: avoid;
  }
}

/* Landscape Orientation on Mobile */
@media (max-width: 767px) and (orientation: landscape) {
  .hero {
    min-height: auto;
    padding: 60px 0 40px;
  }
  
  .phone-mockup {
    width: 150px;
    height: 300px;
  }
  
  .hero-content {
    gap: var(--spacing-lg);
  }
}

/* Focus Styles for Accessibility */
@media (prefers-reduced-motion: no-preference) {
  .btn:focus-visible,
  .nav-link:focus-visible,
  .lang-btn:focus-visible,
  input:focus-visible,
  textarea:focus-visible {
    outline: 3px solid var(--brand-primary);
    outline-offset: 2px;
  }
}

/* High Contrast Mode */
@media (prefers-contrast: high) {
  :root {
    --shadow-light: rgba(0, 0, 0, 0.3);
    --shadow-secondary: rgba(0, 0, 0, 0.4);
    --shadow-primary: rgba(227, 65, 32, 0.4);
  }
  
  .btn-secondary {
    border-width: 3px;
  }
  
  .feature-card,
  .pricing-card,
  .contact-card {
    border-width: 2px;
  }
}