/* ============================================
   Design Tokens & CSS Custom Properties
   ============================================ */
:root {
  /* Colors - Mercury-inspired cream/brown palette */
  --color-primary: #8B6F47;
  --color-primary-dark: #6B5435;
  --color-primary-light: #A68A5E;
  --color-secondary: #D4A574;
  --color-secondary-dark: #B88A5A;
  --color-secondary-light: #E5C4A0;
  --color-accent: #C9984B;
  --color-accent-dark: #A67C3D;
  --color-accent-light: #E0B66F;
  --color-background: #FAF8F5;
  --color-surface: #F5F2ED;
  --color-surface-dark: #2D2520;
  --color-border: #E8E3DB;
  --color-border-dark: #4A3F35;
  --color-text: #2D2520;
  --color-text-muted: #6B5F52;
  --color-text-light: #9B8B7E;
  --color-text-on-dark: #FAF8F5;
  --color-success: #7A9F5E;
  --color-error: #C94B4B;
  --color-warning: #D4A574;
  --color-info: #8B6F47;
  
  /* Typography */
  --font-body: 'Epilogue', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'Fira Code', 'SF Mono', Monaco, 'Cascadia Code', Consolas, monospace;
  --font-size-display: 72px;
  --font-size-h1: 48px;
  --font-size-h2: 36px;
  --font-size-h3: 24px;
  --font-size-h4: 20px;
  --font-size-body-lg: 20px;
  --font-size-body: 16px;
  --font-size-body-sm: 14px;
  --font-size-caption: 12px;
  --font-size-label: 14px;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --line-height-display: 1.1;
  --line-height-heading: 1.2;
  --line-height-body: 1.6;
  --letter-spacing-display: -0.02em;
  --letter-spacing-heading: -0.01em;
  
  /* Spacing */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
  --space-12: 48px;
  --space-16: 64px;
  --space-20: 80px;
  --space-24: 96px;
  --space-32: 128px;
  
  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-full: 9999px;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.12);
  
  /* Max Widths */
  --max-width-xs: 480px;
  --max-width-sm: 640px;
  --max-width-md: 768px;
  --max-width-lg: 1024px;
  --max-width-xl: 1280px;
  --max-width-2xl: 1536px;
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 200ms ease;
  --transition-slow: 300ms ease;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  font-size: var(--font-size-body);
  font-weight: var(--font-weight-normal);
  line-height: var(--line-height-body);
  color: var(--color-text);
  background-color: var(--color-background);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
}

ul, ol {
  list-style: none;
}

/* ============================================
   Accessibility
   ============================================ */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--color-primary);
  color: white;
  padding: var(--space-2) var(--space-4);
  text-decoration: none;
  border-radius: var(--radius-md);
  z-index: 10000;
}

.skip-link:focus {
  top: var(--space-2);
  left: var(--space-2);
}

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

/* ============================================
   Container
   ============================================ */
.container {
  width: 100%;
  max-width: var(--max-width-xl);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

/* ============================================
   Navigation
   ============================================ */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  transition: all var(--transition-base);
  background-color: var(--color-background);
  box-shadow: var(--shadow-sm);
}

.navbar.scrolled {
  background-color: var(--color-background);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow-md);
}

.navbar.scrolled .nav-link,
.navbar.scrolled .logo {
  color: var(--color-text);
}

.navbar.scrolled .mobile-menu-toggle {
  color: var(--color-text);
}

.navbar-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 80px;
}

.logo {
  display: flex;
  align-items: center;
  font-size: var(--font-size-h4);
  font-weight: var(--font-weight-bold);
  color: var(--color-text);
}

.logo-image {
  height: 64px;
  width: auto;
  display: block;
  shape-rendering: crispEdges;
  image-rendering: pixelated;
  image-rendering: -moz-crisp-edges;
  image-rendering: crisp-edges;
}

.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--color-text);
  padding: var(--space-2);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

.mobile-menu-close {
  display: none;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

.nav-link {
  font-size: var(--font-size-body);
  font-weight: var(--font-weight-medium);
  color: var(--color-text);
  transition: color var(--transition-fast);
}

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

.nav-cta {
  white-space: nowrap;
}

/* ============================================
   Buttons
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-3) var(--space-6);
  font-size: var(--font-size-label);
  font-weight: var(--font-weight-semibold);
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
  white-space: nowrap;
}

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

.btn-primary:hover {
  background-color: var(--color-primary-dark);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

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

.btn-secondary:hover {
  background-color: var(--color-primary-light);
  color: white;
  border-color: var(--color-primary-light);
}

.btn-secondary-light {
  background-color: transparent;
  color: var(--color-text-on-dark);
  border: 2px solid var(--color-text-on-dark);
}

.btn-secondary-light:hover {
  background-color: var(--color-text-on-dark);
  color: var(--color-surface-dark);
}

.btn-lg {
  padding: var(--space-4) var(--space-8);
  font-size: var(--font-size-body);
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
  background: var(--color-background);
  padding: 160px 0 var(--space-24);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(circle at 20% 50%, rgba(139, 111, 71, 0.05) 0%, transparent 50%),
              radial-gradient(circle at 80% 80%, rgba(212, 165, 116, 0.05) 0%, transparent 50%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
}

.hero-title {
  font-size: var(--font-size-display);
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-display);
  letter-spacing: var(--letter-spacing-display);
  color: var(--color-text);
  margin-bottom: var(--space-6);
}

.hero-subtitle {
  font-size: var(--font-size-body-lg);
  line-height: var(--line-height-body);
  color: var(--color-text-muted);
  opacity: 0.9;
  max-width: 800px;
  margin: 0 auto var(--space-10);
}

.hero-cta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-4);
  margin-bottom: var(--space-16);
}

.hero-image {
  max-width: 1000px;
  margin: 0 auto;
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-xl);
  position: relative;
}

.hero-image::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(
    180deg,
    rgba(250, 248, 245, 0) 0%,
    rgba(250, 248, 245, 0.05) 30%,
    rgba(250, 248, 245, 0.15) 70%,
    rgba(250, 248, 245, 0.3) 100%
  );
  pointer-events: none;
  z-index: 1;
  opacity: 0;
  animation: overlayFadeIn 1.5s ease-in-out 0.8s forwards;
}

.hero-image img {
  width: 100%;
  display: block;
  transition: transform 0.3s ease-out;
}

@keyframes overlayFadeIn {
  to {
    opacity: 1;
  }
}

/* ============================================
   Stats Section
   ============================================ */
.stats {
  padding: var(--space-20) 0;
  background-color: var(--color-background);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-12);
  text-align: center;
}

.stat-item {
  padding: var(--space-6);
}

.stat-number {
  font-size: var(--font-size-h1);
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
  margin-bottom: var(--space-2);
}

.stat-label {
  font-size: var(--font-size-body);
  color: var(--color-text-muted);
}

/* ============================================
   Features Section
   ============================================ */
.features {
  padding: var(--space-24) 0;
  background-color: var(--color-background);
}

.section-title {
  font-size: var(--font-size-h2);
  font-weight: var(--font-weight-bold);
  text-align: center;
  margin-bottom: var(--space-16);
  color: var(--color-text);
}

.section-title-light {
  font-size: var(--font-size-h2);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--space-6);
  color: var(--color-text-on-dark);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-8);
}

.feature-card {
  padding: var(--space-8);
  background-color: var(--color-surface);
  border-radius: var(--radius-lg);
  transition: all var(--transition-base);
}

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

.feature-icon {
  color: var(--color-primary);
  margin-bottom: var(--space-4);
}

.feature-title {
  font-size: var(--font-size-h3);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-3);
  color: var(--color-text);
}

.feature-description {
  font-size: var(--font-size-body);
  color: var(--color-text-muted);
  line-height: var(--line-height-body);
}

/* ============================================
   Platform Section
   ============================================ */
.platform {
  padding: var(--space-24) 0;
  background-color: var(--color-surface-dark);
}

.platform-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-16);
  align-items: center;
}

.platform-description {
  font-size: var(--font-size-body);
  color: var(--color-text-on-dark);
  opacity: 0.9;
  line-height: var(--line-height-body);
  margin-bottom: var(--space-8);
}

.platform-features {
  margin-bottom: var(--space-8);
}

.platform-feature {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) 0;
  color: var(--color-text-on-dark);
  font-size: var(--font-size-body);
}

.platform-feature svg {
  color: var(--color-secondary);
  flex-shrink: 0;
}

.code-snippet {
  background-color: rgba(0, 0, 0, 0.3);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.code-header {
  padding: var(--space-3) var(--space-4);
  background-color: rgba(0, 0, 0, 0.2);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.code-title {
  font-size: var(--font-size-body-sm);
  color: var(--color-text-light);
  font-family: var(--font-mono);
}

.code-content {
  padding: var(--space-6);
  overflow-x: auto;
}

.code-content code {
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.6;
  color: var(--color-text-on-dark);
}

/* ============================================
   Pricing Section
   ============================================ */
.pricing {
  padding: var(--space-24) 0;
  background: linear-gradient(180deg, var(--color-background) 0%, var(--color-surface) 100%);
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-8);
  margin-top: var(--space-12);
}

.pricing-card {
  background-color: white;
  border-radius: var(--radius-lg);
  padding: var(--space-10);
  box-shadow: var(--shadow-md);
  transition: all var(--transition-base);
  position: relative;
}

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

.pricing-card-featured {
  border: 2px solid var(--color-primary);
  transform: scale(1.05);
}

.pricing-badge {
  position: absolute;
  top: var(--space-6);
  right: var(--space-6);
  background-color: var(--color-accent);
  color: white;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  font-size: var(--font-size-caption);
  font-weight: var(--font-weight-semibold);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.pricing-tier {
  font-size: var(--font-size-h3);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--space-6);
  color: var(--color-text);
}

.pricing-price {
  display: flex;
  align-items: baseline;
  margin-bottom: var(--space-8);
}

.price-currency {
  font-size: var(--font-size-h3);
  font-weight: var(--font-weight-bold);
  color: var(--color-text);
}

.price-amount {
  font-size: var(--font-size-display);
  font-weight: var(--font-weight-bold);
  color: var(--color-text);
  line-height: 1;
}

.price-period {
  font-size: var(--font-size-body);
  color: var(--color-text-muted);
  margin-left: var(--space-2);
}

.pricing-features {
  margin-bottom: var(--space-8);
}

.pricing-features li {
  padding: var(--space-3) 0;
  color: var(--color-text);
  font-size: var(--font-size-body);
  border-bottom: 1px solid var(--color-border);
}

.pricing-features li:last-child {
  border-bottom: none;
}

.pricing-card .btn {
  width: 100%;
}

/* ============================================
   Security Section
   ============================================ */
.security {
  padding: var(--space-24) 0;
  background-color: var(--color-background);
}

.security-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-10);
  margin-top: var(--space-12);
}

.security-card {
  text-align: center;
  padding: var(--space-6);
}

.security-icon {
  color: var(--color-primary);
  margin: 0 auto var(--space-4);
  display: flex;
  justify-content: center;
}

.security-title {
  font-size: var(--font-size-h3);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-3);
  color: var(--color-text);
}

.security-description {
  font-size: var(--font-size-body);
  color: var(--color-text-muted);
  line-height: var(--line-height-body);
}

/* ============================================
   Final CTA Section
   ============================================ */
.final-cta {
  padding: var(--space-24) 0;
  background: linear-gradient(135deg, var(--color-surface-dark) 0%, #1a202e 100%);
  position: relative;
  overflow: hidden;
}

.final-cta::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(circle at 50% 50%, rgba(99, 102, 241, 0.15) 0%, transparent 70%);
  pointer-events: none;
}

.final-cta-content {
  text-align: center;
  position: relative;
  z-index: 1;
}

.final-cta-subtitle {
  font-size: var(--font-size-body-lg);
  color: var(--color-text-on-dark);
  opacity: 0.9;
  margin-bottom: var(--space-8);
}

/* ============================================
   Footer
   ============================================ */
.footer {
  background-color: var(--color-surface-dark);
  padding: var(--space-16) 0 var(--space-8);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr repeat(4, 1fr);
  gap: var(--space-10);
  margin-bottom: var(--space-12);
}

.footer-logo {
  height: 32px;
  width: auto;
  margin-bottom: var(--space-3);
}

.footer-tagline {
  font-size: var(--font-size-body-sm);
  color: var(--color-text-light);
}

.footer-title {
  font-size: var(--font-size-label);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-on-dark);
  margin-bottom: var(--space-4);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.footer-links li {
  margin-bottom: var(--space-3);
}

.footer-links a {
  font-size: var(--font-size-body-sm);
  color: var(--color-text-light);
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: var(--color-primary-light);
}

.footer-bottom {
  padding-top: var(--space-8);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  text-align: center;
}

.footer-copyright {
  font-size: var(--font-size-body-sm);
  color: var(--color-text-light);
}

/* ============================================
   Animations
   ============================================ */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.animate-fade-in {
  animation: fadeIn 0.8s ease forwards;
}

.animate-fade-in-delay-1 {
  opacity: 0;
  animation: fadeIn 0.8s ease 0.2s forwards;
}

.animate-fade-in-delay-2 {
  opacity: 0;
  animation: fadeIn 0.8s ease 0.4s forwards;
}

.animate-fade-in-delay-3 {
  opacity: 0;
  animation: fadeIn 0.8s ease 0.6s forwards;
}

.animate-on-scroll {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.6s ease;
}

.animate-on-scroll.visible {
  opacity: 1;
  transform: translateY(0);
}

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

/* Tablet (768px and below) */
@media (max-width: 768px) {
  :root {
    --font-size-display: 48px;
    --font-size-h1: 36px;
    --font-size-h2: 28px;
    --font-size-h3: 20px;
  }
  
  .navbar-content {
    height: 64px;
  }
  
  .mobile-menu-toggle {
    display: block;
  }
  
  .nav-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 100%;
    height: 100vh;
    background-color: var(--color-surface-dark);
    flex-direction: column;
    justify-content: center;
    padding: var(--space-8);
    transition: right var(--transition-base);
  }
  
  .nav-menu.active {
    right: 0;
  }
  
  .mobile-menu-close {
    display: block;
    position: absolute;
    top: var(--space-6);
    right: var(--space-6);
    background: none;
    border: none;
    cursor: pointer;
    color: white;
    padding: var(--space-2);
  }
  
  .nav-links {
    flex-direction: column;
    gap: var(--space-6);
  }
  
  .nav-link {
    font-size: var(--font-size-h3);
  }
  
  .hero {
    padding: 120px 0 var(--space-16);
  }
  
  .hero-cta {
    flex-direction: column;
  }
  
  .stats-grid {
    grid-template-columns: 1fr;
    gap: var(--space-8);
  }
  
  .features-grid {
    grid-template-columns: 1fr;
    gap: var(--space-6);
  }
  
  .platform-grid {
    grid-template-columns: 1fr;
    gap: var(--space-10);
  }
  
  .pricing-grid {
    grid-template-columns: 1fr;
    gap: var(--space-6);
  }
  
  .pricing-card-featured {
    transform: scale(1);
  }
  
  .security-grid {
    grid-template-columns: 1fr;
    gap: var(--space-8);
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
    gap: var(--space-8);
  }
}

/* Mobile (375px) */
@media (max-width: 375px) {
  .container {
    padding: 0 var(--space-4);
  }
  
  .btn-lg {
    padding: var(--space-3) var(--space-6);
    font-size: var(--font-size-body-sm);
  }
  
  .hero-title {
    font-size: 36px;
  }
  
  .stat-number {
    font-size: var(--font-size-h2);
  }
}

/* Desktop (1024px and above) */
@media (min-width: 1024px) {
  .container {
    padding: 0 var(--space-10);
  }
}