/* ================================================
   RESPONSIVE DESIGN - MOBILE FIRST APPROACH
   ================================================ */

/* ================================================
   BREAKPOINTS
   - Mobile: 320px - 767px
   - Tablet: 768px - 1023px  
   - Desktop: 1024px+
   - Large Desktop: 1200px+
   ================================================ */

/* ================================================
   MOBILE FIRST (Default - up to 767px)
   ================================================ */

/* Navigation - Mobile */
.nav-menu {
  position: fixed;
  top: 0;
  right: -100%;
  width: 100%;
  height: 100vh;
  background: var(--white);
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: var(--spacing-2xl);
  transition: right var(--transition-normal);
  z-index: var(--z-modal);
}

.nav-menu.active {
  right: 0;
}

.nav-toggle {
  display: block;
  z-index: calc(var(--z-modal) + 1);
}

.nav-toggle.active {
  color: var(--primary-main);
}

/* Hero Section - Mobile */
.hero-container {
  grid-template-columns: 1fr;
  gap: var(--spacing-2xl);
  text-align: center;
  padding: var(--spacing-xl) var(--spacing-lg);
}

.hero-content {
  order: 2;
}

.hero-phone {
  order: 1;
}

.hero-title {
  font-size: var(--font-size-4xl);
}

.hero-buttons {
  flex-direction: column;
  gap: var(--spacing-md);
}

.hero-stats {
  gap: var(--spacing-lg);
}

.phone-mockup {
  width: 250px;
  height: 500px;
}

/* Problem-Solution - Mobile */
.problems-grid {
  grid-template-columns: 1fr;
  gap: var(--spacing-xl);
}

.problem-card {
  padding: var(--spacing-xl);
}

/* Features - Mobile */
.features-grid {
  gap: var(--spacing-2xl);
}

.feature-card {
  grid-template-columns: 1fr;
  gap: var(--spacing-xl);
  text-align: center;
}

.feature-card:nth-child(even) {
  direction: ltr;
}

.feature-video,
.feature-visual {
  aspect-ratio: 16/9;
}

/* How It Works - Mobile */
.steps-container {
  grid-template-columns: 1fr;
  gap: var(--spacing-xl);
}

.step-arrow {
  transform: rotate(90deg);
  margin: var(--spacing-md) 0;
}

/* Testimonials - Mobile */
.testimonials-grid {
  grid-template-columns: 1fr;
  gap: var(--spacing-xl);
}

/* Download CTA - Mobile */
.download-buttons {
  flex-direction: column;
  gap: var(--spacing-lg);
}

.cta-stats {
  flex-direction: column;
  gap: var(--spacing-lg);
}

/* Footer - Mobile */
.footer-content {
  grid-template-columns: 1fr;
  gap: var(--spacing-2xl);
  text-align: center;
}

.footer-links {
  grid-template-columns: 1fr;
  gap: var(--spacing-xl);
  text-align: center;
}

/* Utility adjustments - Mobile */
.container {
  padding: 0 var(--spacing-lg);
}

.section {
  padding: var(--spacing-2xl) 0;
}

.section-title {
  font-size: var(--font-size-3xl);
}

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

@media (min-width: 768px) {
  
  /* Navigation - Tablet */
  .nav-menu {
    position: static;
    width: auto;
    height: auto;
    background: transparent;
    flex-direction: row;
    gap: var(--spacing-xl);
  }
  
  .nav-toggle {
    display: none;
  }

  /* Hero Section - Tablet */
  .hero-container {
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
    text-align: left;
    padding: 0 var(--spacing-xl);
  }

  .hero-content {
    order: 1;
  }

  .hero-phone {
    order: 2;
  }

  .hero-title {
    font-size: var(--font-size-5xl);
  }

  .hero-buttons {
    flex-direction: row;
    gap: var(--spacing-lg);
  }

  .hero-stats {
    gap: var(--spacing-xl);
  }

  .phone-mockup {
    width: 280px;
    height: 560px;
  }

  /* Problem-Solution - Tablet */
  .problems-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-xl);
  }

  .problems-grid .problem-card:nth-child(3) {
    grid-column: 1 / -1;
    max-width: 400px;
    margin: 0 auto;
  }

  /* Features - Tablet */
  .feature-card {
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    text-align: left;
  }

  .feature-card:nth-child(even) {
    direction: rtl;
  }

  .feature-card:nth-child(even) > * {
    direction: ltr;
  }

  /* How It Works - Tablet */
  .steps-container {
    grid-template-columns: 1fr auto 1fr auto 1fr;
    gap: var(--spacing-lg);
  }

  .step-arrow {
    transform: rotate(0deg);
    margin: 0;
  }

  /* Testimonials - Tablet */
  .testimonials-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-xl);
  }

  .testimonials-grid .testimonial-card:nth-child(3) {
    grid-column: 1 / -1;
    max-width: 500px;
    margin: 0 auto;
  }

  /* Download CTA - Tablet */
  .download-buttons {
    flex-direction: row;
    gap: var(--spacing-xl);
  }

  .cta-stats {
    flex-direction: row;
    gap: var(--spacing-2xl);
  }

  /* Footer - Tablet */
  .footer-content {
    grid-template-columns: 1fr 1.5fr;
    gap: var(--spacing-2xl);
    text-align: left;
  }

  .footer-links {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-xl);
  }

  /* Utility adjustments - Tablet */
  .container {
    padding: 0 var(--spacing-xl);
  }

  .section {
    padding: var(--spacing-3xl) 0;
  }
}

/* ================================================
   DESKTOP (1024px - 1199px)
   ================================================ */

@media (min-width: 1024px) {
  
  /* Hero Section - Desktop */
  .hero-title {
    font-size: var(--font-size-6xl);
  }

  .phone-mockup {
    width: 300px;
    height: 600px;
  }

  /* Problem-Solution - Desktop */
  .problems-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .problems-grid .problem-card:nth-child(3) {
    grid-column: auto;
    max-width: none;
  }

  /* Features - Desktop */
  .feature-video,
  .feature-visual {
    aspect-ratio: 16/10;
  }

  /* Testimonials - Desktop */
  .testimonials-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .testimonials-grid .testimonial-card:nth-child(3) {
    grid-column: auto;
    max-width: none;
  }

  /* Footer - Desktop */
  .footer-links {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* ================================================
   LARGE DESKTOP (1200px+)
   ================================================ */

@media (min-width: 1200px) {
  
  /* Container max-width already set to 1200px in main.css */
  
  /* Hero Section - Large Desktop */
  .hero-container {
    gap: var(--spacing-3xl);
  }

  /* Features - Large Desktop */
  .feature-card {
    gap: var(--spacing-2xl);
  }

  /* How It Works - Large Desktop */
  .steps-container {
    gap: var(--spacing-xl);
  }
}

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

@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 2dppx) {
  .logo,
  .footer-logo {
    image-rendering: -webkit-optimize-contrast;
    image-rendering: crisp-edges;
  }
}

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

@media print {
  * {
    background: transparent !important;
    color: black !important;
    box-shadow: none !important;
    text-shadow: none !important;
  }

  .navbar,
  .hero-video,
  .feature-video,
  .download-cta,
  .nav-toggle,
  .hero-buttons,
  .social-links {
    display: none !important;
  }

  .hero {
    min-height: auto;
    background: white !important;
    color: black !important;
  }

  .hero-title,
  .section-title {
    color: black !important;
  }

  .container {
    max-width: none;
    margin: 0;
    padding: 0;
  }

  h1, h2, h3 {
    page-break-after: avoid;
  }

  .feature-card,
  .problem-card,
  .testimonial-card {
    page-break-inside: avoid;
    border: 1px solid #ccc !important;
    margin-bottom: 1rem;
  }
}

/* ================================================
   ACCESSIBILITY & 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;
  }

  .perma-wheel {
    animation: none;
  }

  .hero-video,
  .feature-video video {
    display: none;
  }
}

/* ================================================
   HIGH CONTRAST MODE
   ================================================ */

@media (prefers-contrast: high) {
  :root {
    --primary-main: #000080;
    --secondary-main: #008080;
    --text: #000000;
    --text-secondary: #333333;
    --background: #ffffff;
    --border: #000000;
  }

  .btn {
    border: 2px solid;
  }

  .card,
  .problem-card,
  .feature-card,
  .testimonial-card {
    border: 2px solid var(--border);
  }
}

/* ================================================
   DARK MODE PREFERENCE
   ================================================ */

@media (prefers-color-scheme: dark) {
  :root {
    --text: #f9fafb;
    --text-secondary: #d1d5db;
    --background: #111827;
    --surface: #1f2937;
    --border: #374151;
  }

  .navbar {
    background: rgba(31, 41, 55, 0.95);
  }

  .card,
  .problem-card,
  .feature-card,
  .testimonial-card {
    background: var(--surface);
    border-color: var(--border);
  }

  .hero-overlay {
    background: linear-gradient(135deg, 
      rgba(79, 70, 229, 0.9) 0%, 
      rgba(79, 70, 229, 0.7) 50%, 
      rgba(6, 182, 212, 0.9) 100%);
  }
}

/* ================================================
   FOCUS STYLES FOR KEYBOARD NAVIGATION
   ================================================ */

.nav-link:focus,
.btn:focus,
.form-input:focus,
.form-select:focus,
.modal-close:focus,
.dropdown-item:focus {
  outline: 2px solid var(--primary-main);
  outline-offset: 2px;
}

/* Skip to main content link for screen readers */
.skip-link {
  position: absolute;
  top: -40px;
  left: 6px;
  background: var(--primary-main);
  color: var(--white);
  padding: 8px;
  text-decoration: none;
  border-radius: var(--radius-md);
  z-index: var(--z-tooltip);
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 6px;
}

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

@media (max-height: 500px) and (orientation: landscape) {
  .hero {
    min-height: auto;
    padding: var(--spacing-xl) 0;
  }

  .hero-container {
    gap: var(--spacing-lg);
  }

  .phone-mockup {
    width: 200px;
    height: 400px;
  }

  .hero-title {
    font-size: var(--font-size-3xl);
  }

  .section {
    padding: var(--spacing-xl) 0;
  }
}

/* ================================================
   SPECIFIC MOBILE DEVICE ADJUSTMENTS
   ================================================ */

/* iPhone SE and similar small screens */
@media (max-width: 375px) {
  .container {
    padding: 0 var(--spacing-md);
  }

  .hero-title {
    font-size: var(--font-size-3xl);
  }

  .section-title {
    font-size: var(--font-size-2xl);
  }

  .phone-mockup {
    width: 200px;
    height: 400px;
  }

  .btn-large {
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: var(--font-size-base);
  }

  .hero-stats {
    gap: var(--spacing-md);
  }

  .stat-number {
    font-size: var(--font-size-lg);
  }
}

/* Large phones and phablets */
@media (min-width: 414px) and (max-width: 767px) {
  .phone-mockup {
    width: 280px;
    height: 560px;
  }

  .problems-grid {
    grid-template-columns: 1fr;
    max-width: 500px;
    margin: 0 auto;
  }
}

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

@media (hover: none) and (pointer: coarse) {
  .btn,
  .nav-link,
  .card,
  .problem-card,
  .feature-card,
  .testimonial-card {
    touch-action: manipulation;
  }

  .btn {
    min-height: 44px; /* Minimum touch target size */
  }

  .nav-link {
    padding: var(--spacing-md);
  }

  /* Disable hover effects on touch devices */
  .card:hover,
  .problem-card:hover,
  .feature-card:hover,
  .testimonial-card:hover,
  .phone-mockup:hover {
    transform: none;
    box-shadow: var(--shadow-md);
  }

  .btn:hover {
    transform: none;
  }
}