/* ============================================
   LiteApps Static Website - Main Stylesheet
   Pure CSS3, No JavaScript, Mobile-First
   ============================================ */

/* Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Questrial&family=Archivo:wght@400;500;600;700&display=swap');

/* ============================================
   CSS Custom Properties (Design System)
   ============================================ */
:root {
  /* Primary brand color - LiteApps blue */
  --color-primary: #0076D3;
  --color-primary-dark: #005BA3;
  --color-primary-light: #00A2E0;

  /* Supporting colors */
  --color-secondary: #4770DB;
  --color-accent: #E32402;

  /* Neutrals - LiteApps palette */
  --color-text: #0E1B4D;
  --color-text-light: rgba(14, 27, 77, 0.75);
  --color-background: #ffffff;
  --color-background-alt: #EFF0F5;
  --color-border: #d1d5db;

  /* Gradients */
  --gradient-primary: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
  --gradient-hero: linear-gradient(135deg, #0076D3 0%, #4770DB 50%, #00A2E0 100%);

  /* Spacing scale */
  --spacing-xs: 0.5rem;
  --spacing-sm: 0.75rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;
  --spacing-4xl: 6rem;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.1);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
  --shadow-lg: 0 10px 15px rgba(0,0,0,0.1);
  --shadow-xl: 0 20px 25px rgba(0,0,0,0.15);

  /* Border radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 350ms ease;

  /* Typography */
  --font-heading: 'Questrial', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-body: 'Archivo', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

/* ============================================
   CSS Reset & Base Styles
   ============================================ */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-background);
  overflow-x: hidden;
}

/* ============================================
   Typography
   ============================================ */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 600;
  line-height: 1.2;
  color: var(--color-text);
  margin-bottom: var(--spacing-md);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.125rem; }
h6 { font-size: 1rem; }

p {
  margin-bottom: var(--spacing-md);
  color: var(--color-text-light);
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-base);
}

a:hover {
  color: var(--color-primary-dark);
}

a:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* ============================================
   Layout Utilities
   ============================================ */
.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

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

.section-alt {
  background-color: var(--color-background-alt);
}

.text-center {
  text-align: center;
}

/* ============================================
   Navigation Header
   ============================================ */
.nav-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: var(--color-background);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-md);
  max-width: 1280px;
  margin: 0 auto;
}

.nav-logo {
  display: flex;
  align-items: center;
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text);
}

/* Mobile menu toggle (CSS-only using checkbox) */
.nav-toggle {
  display: none;
}

.nav-toggle-label {
  display: none;
  cursor: pointer;
  flex-direction: column;
  gap: 4px;
  padding: var(--spacing-xs);
}

.nav-toggle-label span {
  display: block;
  width: 24px;
  height: 3px;
  background-color: var(--color-text);
  border-radius: var(--radius-sm);
  transition: all var(--transition-base);
}

.nav-menu {
  display: flex;
  gap: var(--spacing-xl);
  list-style: none;
}

.nav-menu a {
  font-weight: 500;
  color: var(--color-text);
  transition: color var(--transition-base);
}

.nav-menu a:hover {
  color: var(--color-primary);
}

/* Mobile navigation */
@media (max-width: 767px) {
  .nav-toggle-label {
    display: flex;
  }

  .nav-menu {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--color-background);
    flex-direction: column;
    gap: 0;
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-md);
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-base);
  }

  .nav-menu li {
    padding: var(--spacing-md) 0;
    border-bottom: 1px solid var(--color-border);
  }

  .nav-menu li:last-child {
    border-bottom: none;
  }

  .nav-toggle:checked ~ .nav-menu {
    max-height: 500px;
  }

  .nav-toggle:checked ~ .nav-toggle-label span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
  }

  .nav-toggle:checked ~ .nav-toggle-label span:nth-child(2) {
    opacity: 0;
  }

  .nav-toggle:checked ~ .nav-toggle-label span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
  }
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
  background: var(--gradient-hero);
  color: white;
  padding: var(--spacing-4xl) var(--spacing-md);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(circle at 30% 50%, rgba(255,255,255,0.1) 0%, transparent 50%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 800px;
  margin: 0 auto;
}

.hero h1 {
  color: white;
  font-size: 2.5rem;
  margin-bottom: var(--spacing-lg);
}

.hero p {
  font-size: 1.25rem;
  color: rgba(255, 255, 255, 0.95);
  margin-bottom: var(--spacing-xl);
  line-height: 1.8;
}

.hero .btn-primary {
  font-size: 1.125rem;
  padding: var(--spacing-md) var(--spacing-xl);
}

/* ============================================
   Buttons
   ============================================ */
.btn {
  display: inline-block;
  padding: var(--spacing-sm) var(--spacing-lg);
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 1rem;
  text-align: center;
  text-decoration: none;
  border: none;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-base);
  white-space: nowrap;
}

.btn-primary {
  background-color: white;
  color: var(--color-primary);
  box-shadow: var(--shadow-md);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  color: var(--color-primary-dark);
}

.btn-secondary {
  background-color: var(--color-primary);
  color: white;
  box-shadow: var(--shadow-md);
}

.btn-secondary:hover {
  background-color: var(--color-primary-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn-outline {
  background-color: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}

.btn-outline:hover {
  background-color: var(--color-primary);
  color: white;
}

.btn:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* ============================================
   Feature Grid
   ============================================ */
.feature-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-xl);
  margin-top: var(--spacing-2xl);
}

.feature-card {
  background-color: var(--color-background);
  padding: var(--spacing-xl);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
  transition: all var(--transition-base);
  border: 1px solid var(--color-border);
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
}

.feature-icon {
  font-size: 3rem;
  margin-bottom: var(--spacing-md);
  display: block;
}

.feature-card h3 {
  color: var(--color-text);
  margin-bottom: var(--spacing-sm);
}

.feature-card p {
  color: var(--color-text-light);
  margin-bottom: 0;
}

/* ============================================
   Pricing Grid
   ============================================ */
.pricing-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-xl);
  margin-top: var(--spacing-2xl);
}

.pricing-card {
  display: flex;
  flex-direction: column;
  background-color: var(--color-background);
  padding: var(--spacing-xl);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
  border: 2px solid var(--color-border);
  transition: all var(--transition-base);
  text-align: center;
}

.pricing-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
}

.pricing-card.featured {
  border-color: var(--color-primary);
  position: relative;
  box-shadow: var(--shadow-lg);
}

.pricing-card.featured::before {
  content: 'MOST POPULAR';
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--gradient-primary);
  color: white;
  padding: var(--spacing-xs) var(--spacing-lg);
  border-radius: var(--radius-lg);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.5px;
}

.pricing-header h3 {
  font-size: 1.5rem;
  margin-bottom: var(--spacing-sm);
}

.pricing-price {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--color-primary);
  margin: var(--spacing-md) 0;
}

.pricing-price span {
  font-size: 1rem;
  color: var(--color-text-light);
  font-weight: 400;
}

.pricing-features {
  list-style: none;
  margin: var(--spacing-xl) 0;
  text-align: left;
}

.pricing-features li {
  padding: var(--spacing-sm) 0;
  color: var(--color-text-light);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.pricing-features li::before {
  content: '✓';
  color: var(--color-primary);
  font-weight: 700;
  font-size: 1.25rem;
}

.pricing-card .btn {
  margin-top: auto;
}

/* ============================================
   Contact Form
   ============================================ */
.contact-form {
  max-width: 600px;
  margin: var(--spacing-2xl) auto;
  background-color: var(--color-background);
  padding: var(--spacing-2xl);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
}

.form-group {
  margin-bottom: var(--spacing-lg);
}

.form-group label {
  display: block;
  font-weight: 600;
  margin-bottom: var(--spacing-xs);
  color: var(--color-text);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: var(--spacing-md);
  font-family: var(--font-body);
  font-size: 1rem;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
  background-color: var(--color-background);
  color: var(--color-text);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(0, 118, 211, 0.1);
}

.form-group textarea {
  min-height: 150px;
  resize: vertical;
}

.form-group small {
  display: block;
  margin-top: var(--spacing-xs);
  color: var(--color-text-light);
  font-size: 0.875rem;
}

/* ============================================
   Footer
   ============================================ */
.footer {
  background-color: var(--color-text);
  color: rgba(255, 255, 255, 0.8);
  padding: var(--spacing-3xl) var(--spacing-md) var(--spacing-xl);
}

.footer-content {
  max-width: 1280px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-xl);
}

.footer-section h4 {
  color: white;
  margin-bottom: var(--spacing-md);
  font-size: 1rem;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.footer-links a {
  color: rgba(255, 255, 255, 0.8);
  transition: color var(--transition-base);
}

.footer-links a:hover {
  color: white;
}

.footer-bottom {
  max-width: 1280px;
  margin: var(--spacing-xl) auto 0;
  padding-top: var(--spacing-xl);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  text-align: center;
  color: rgba(255, 255, 255, 0.6);
  font-size: 0.875rem;
}

/* ============================================
   Legal Pages
   ============================================ */
.legal-section {
  max-width: 800px;
  margin: 0 auto;
  padding: var(--spacing-3xl) var(--spacing-md);
}

.legal-section h1 {
  margin-bottom: var(--spacing-sm);
}

.legal-section .last-updated {
  color: var(--color-text-light);
  font-style: italic;
  margin-bottom: var(--spacing-2xl);
}

.legal-section h2 {
  margin-top: var(--spacing-2xl);
  margin-bottom: var(--spacing-md);
  color: var(--color-primary);
}

.legal-section h3 {
  margin-top: var(--spacing-xl);
  margin-bottom: var(--spacing-sm);
}

.legal-section p,
.legal-section li {
  line-height: 1.8;
}

.legal-section ul,
.legal-section ol {
  margin-left: var(--spacing-xl);
  margin-bottom: var(--spacing-md);
}

/* ============================================
   Thank You Page
   ============================================ */
.thank-you-container {
  max-width: 600px;
  margin: var(--spacing-4xl) auto;
  text-align: center;
  padding: var(--spacing-2xl);
}

.thank-you-icon {
  font-size: 4rem;
  margin-bottom: var(--spacing-lg);
  display: block;
}

.thank-you-container h1 {
  color: var(--color-primary);
  margin-bottom: var(--spacing-md);
}

.thank-you-container p {
  font-size: 1.125rem;
  margin-bottom: var(--spacing-xl);
}

/* ============================================
   CTA Section
   ============================================ */
.cta-section {
  background: var(--gradient-primary);
  color: white;
  text-align: center;
  padding: var(--spacing-4xl) var(--spacing-md);
}

.cta-section h2 {
  color: white;
  margin-bottom: var(--spacing-md);
}

.cta-section p {
  color: rgba(255, 255, 255, 0.95);
  font-size: 1.125rem;
  margin-bottom: var(--spacing-xl);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* ============================================
   Responsive Design - Tablet (768px+)
   ============================================ */
@media (min-width: 768px) {
  .container {
    padding: 0 var(--spacing-xl);
  }

  .hero h1 {
    font-size: 3.5rem;
  }

  .hero p {
    font-size: 1.375rem;
  }

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

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

  .footer-content {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ============================================
   Responsive Design - Desktop (1280px+)
   ============================================ */
@media (min-width: 1280px) {
  .hero h1 {
    font-size: 4rem;
  }

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

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

  .footer-content {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* ============================================
   Accessibility Enhancements
   ============================================ */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* Focus visible for keyboard navigation */
:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}