/* ===================================
   CSS Variables & Reset
   =================================== */
:root {
  /* Colors */
  --primary-gradient-start: #6366f1;
  --primary-gradient-end: #8b5cf6;
  --secondary: #f59e0b;
  --accent: #10b981;
  --background-dark: #0f172a;
  --background-darker: #020617;
  --surface: #1e293b;
  --surface-light: #334155;
  --text-primary: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  --border: #334155;
  
  /* Spacing */
  --container-max: 1280px;
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4rem;
  --spacing-3xl: 6rem;
  
  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-size-base: 16px;
  --line-height-base: 1.6;
  
  /* Effects */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.2);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.3);
  --shadow-glow: 0 0 20px rgba(99, 102, 241, 0.3);
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 300ms ease;
  --transition-slow: 500ms ease;
  
  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: var(--font-size-base);
}

body {
  font-family: var(--font-family);
  background: var(--background-darker);
  color: var(--text-primary);
  line-height: var(--line-height-base);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ===================================
   Typography
   =================================== */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
}

h1 { font-size: clamp(2rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.75rem, 4vw, 2.5rem); }
h3 { font-size: clamp(1.25rem, 3vw, 1.75rem); }
h4 { font-size: 1.25rem; }

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

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

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

strong {
  font-weight: 600;
  color: var(--text-primary);
}

/* ===================================
   Utility Classes
   =================================== */
.gradient-text {
  background: linear-gradient(135deg, var(--primary-gradient-start), var(--primary-gradient-end));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.section-header {
  text-align: center;
  margin-bottom: var(--spacing-3xl);
}

.section-title {
  margin-bottom: var(--spacing-md);
}

.section-subtitle {
  font-size: 1.125rem;
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto;
}

/* ===================================
   Buttons
   =================================== */
button {
  font-family: var(--font-family);
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: all var(--transition-base);
  border-radius: var(--radius-lg);
  padding: 0.75rem 1.5rem;
  font-size: 1rem;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary-gradient-start), var(--primary-gradient-end));
  color: white;
  box-shadow: var(--shadow-lg);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-xl), var(--shadow-glow);
}

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

.btn-secondary:hover {
  border-color: var(--primary-gradient-start);
  background: rgba(99, 102, 241, 0.1);
}

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

.btn-outline:hover {
  background: linear-gradient(135deg, var(--primary-gradient-start), var(--primary-gradient-end));
  color: white;
}

.btn-large {
  padding: 1rem 2rem;
  font-size: 1.125rem;
}

.cta-button {
  background: linear-gradient(135deg, var(--primary-gradient-start), var(--primary-gradient-end));
  color: white;
  padding: 0.625rem 1.5rem;
  font-size: 0.875rem;
}

/* ===================================
   Header & Navigation
   =================================== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(15, 23, 42, 0.8);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.nav-container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 1rem var(--spacing-md);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1.25rem;
  font-weight: 700;
}

.nav-menu {
  display: flex;
  gap: 2rem;
  list-style: none;
}

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

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

.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: transparent;
  padding: 0.5rem;
}

.mobile-menu-toggle span {
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  transition: all var(--transition-base);
}

/* ===================================
   Hero Section
   =================================== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: var(--spacing-3xl) var(--spacing-md);
  padding-top: calc(var(--spacing-3xl) + 60px);
  background: 
    radial-gradient(circle at 20% 50%, rgba(99, 102, 241, 0.15) 0%, transparent 50%),
    radial-gradient(circle at 80% 80%, rgba(139, 92, 246, 0.15) 0%, transparent 50%),
    var(--background-darker);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: 
    linear-gradient(90deg, transparent 0%, var(--background-darker) 100%);
  pointer-events: none;
}

.hero-content {
  max-width: var(--container-max);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-3xl);
  align-items: center;
  position: relative;
  z-index: 1;
}

.hero-text {
  animation: fadeInUp 0.8s ease;
}

.hero-title {
  margin-bottom: var(--spacing-md);
  line-height: 1.1;
}

.hero-subtitle {
  font-size: 1.5rem;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-lg);
  font-weight: 500;
}

.hero-description {
  font-size: 1.125rem;
  line-height: 1.7;
  margin-bottom: var(--spacing-md);
}

.hero-cta-text {
  font-size: 1.125rem;
  line-height: 1.7;
  margin-bottom: var(--spacing-xl);
}

.hero-buttons {
  display: flex;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-xl);
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-lg);
}

.stat {
  display: flex;
  flex-direction: column;
}

.stat-number {
  font-size: 2rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--primary-gradient-start), var(--primary-gradient-end));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-label {
  color: var(--text-muted);
  font-size: 0.875rem;
}

.hero-image {
  animation: fadeInUp 0.8s ease 0.2s backwards;
}

.image-placeholder {
  background: var(--surface);
  border-radius: var(--radius-2xl);
  overflow: hidden;
  box-shadow: var(--shadow-xl);
  border: 1px solid var(--border);
  aspect-ratio: 4/3;
  display: flex;
  align-items: center;
  justify-content: center;
}

.image-placeholder img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.image-placeholder-small {
  background: var(--surface);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border);
  aspect-ratio: 16/10;
  display: flex;
  align-items: center;
  justify-content: center;
}

.image-placeholder-small img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ===================================
   Features Section
   =================================== */
.features {
  padding: var(--spacing-3xl) var(--spacing-md);
  background: var(--background-dark);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--spacing-xl);
  max-width: var(--container-max);
  margin: 0 auto;
}

.feature-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  transition: all var(--transition-base);
  opacity: 0;
  animation: fadeInUp 0.6s ease forwards;
}

.feature-card:nth-child(1) { animation-delay: 0.1s; }
.feature-card:nth-child(2) { animation-delay: 0.2s; }
.feature-card:nth-child(3) { animation-delay: 0.3s; }
.feature-card:nth-child(4) { animation-delay: 0.4s; }
.feature-card:nth-child(5) { animation-delay: 0.5s; }
.feature-card:nth-child(6) { animation-delay: 0.6s; }

.feature-card:hover {
  transform: translateY(-8px);
  border-color: var(--primary-gradient-start);
  box-shadow: var(--shadow-xl), 0 0 30px rgba(99, 102, 241, 0.2);
}

.feature-icon {
  margin-bottom: var(--spacing-lg);
}

.feature-title {
  margin-bottom: var(--spacing-md);
  color: var(--text-primary);
}

.feature-description {
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ===================================
   How It Works Section
   =================================== */
.how-it-works {
  padding: var(--spacing-3xl) var(--spacing-md);
  background: var(--background-darker);
  position: relative;
  overflow: hidden;
}

.steps-container {
  max-width: var(--container-max);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-3xl);
}

.step {
  display: grid;
  grid-template-columns: 100px 1fr 1fr;
  gap: var(--spacing-xl);
  align-items: center;
  position: relative;
  opacity: 0;
  animation: fadeInUp 0.6s ease forwards;
}

.step:nth-child(1) { animation-delay: 0.1s; }
.step:nth-child(2) { animation-delay: 0.3s; }
.step:nth-child(3) { animation-delay: 0.5s; }

.step-reverse {
  direction: rtl;
}

.step-reverse > * {
  direction: ltr;
}

.step-number {
  font-size: 4rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary-gradient-start), var(--primary-gradient-end));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  opacity: 0.5;
}

.step-content {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
}

.step-title {
  margin-bottom: var(--spacing-md);
}

.step-description {
  color: var(--text-secondary);
  line-height: 1.7;
}

.step-image {
  display: flex;
  justify-content: center;
}

/* ===================================
   Use Cases Section
   =================================== */
.use-cases {
  padding: var(--spacing-3xl) var(--spacing-md);
  background: var(--background-dark);
}

.use-cases-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-xl);
  max-width: var(--container-max);
  margin: 0 auto;
}

.use-case-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  transition: all var(--transition-base);
  text-align: center;
}

.use-case-card:hover {
  transform: translateY(-5px);
  border-color: var(--primary-gradient-start);
  box-shadow: var(--shadow-lg);
}

.use-case-icon {
  font-size: 3rem;
  margin-bottom: var(--spacing-lg);
}

.use-case-title {
  margin-bottom: var(--spacing-md);
}

.use-case-description {
  color: var(--text-secondary);
  line-height: 1.7;
  text-align: left;
}

/* ===================================
   Comparison Section
   =================================== */
.comparison {
  padding: var(--spacing-3xl) var(--spacing-md);
  background: var(--background-darker);
}

.comparison-content {
  max-width: 900px;
  margin: 0 auto;
}

.comparison-text {
  font-size: 1.125rem;
  line-height: 1.8;
  margin-bottom: var(--spacing-lg);
  color: var(--text-secondary);
}

.comparison-table {
  margin-top: var(--spacing-xl);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  overflow: hidden;
}

.comparison-row {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  border-bottom: 1px solid var(--border);
}

.comparison-row:last-child {
  border-bottom: none;
}

.comparison-header {
  background: var(--surface-light);
  font-weight: 600;
}

.comparison-cell {
  padding: var(--spacing-md);
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
}

.comparison-cell.highlight {
  background: rgba(99, 102, 241, 0.1);
  font-weight: 600;
  color: var(--primary-gradient-start);
}

/* ===================================
   Pricing Section
   =================================== */
.pricing {
  padding: var(--spacing-3xl) var(--spacing-md);
  background: var(--background-dark);
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-xl);
  max-width: var(--container-max);
  margin: 0 auto var(--spacing-xl);
}

.pricing-card {
  background: var(--surface);
  border: 2px solid var(--border);
  border-radius: var(--radius-2xl);
  padding: var(--spacing-xl);
  position: relative;
  transition: all var(--transition-base);
}

.pricing-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
}

.pricing-featured {
  border-color: var(--primary-gradient-start);
  box-shadow: 0 0 40px rgba(99, 102, 241, 0.3);
  transform: scale(1.05);
}

.pricing-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--surface-light);
  color: var(--text-primary);
  padding: 0.375rem 1rem;
  border-radius: var(--radius-lg);
  font-size: 0.875rem;
  font-weight: 600;
  border: 1px solid var(--border);
}

.pricing-badge.featured {
  background: linear-gradient(135deg, var(--primary-gradient-start), var(--primary-gradient-end));
  border: none;
}

.pricing-title {
  text-align: center;
  margin-top: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

.pricing-price {
  text-align: center;
  margin-bottom: var(--spacing-xl);
}

.price-amount {
  font-size: 3.5rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary-gradient-start), var(--primary-gradient-end));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.price-period {
  color: var(--text-muted);
  font-size: 1rem;
}

.pricing-features {
  list-style: none;
  margin-bottom: var(--spacing-xl);
}

.pricing-features li {
  padding: var(--spacing-sm) 0;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border);
}

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

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

.pricing-note {
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
  font-size: 1.125rem;
  line-height: 1.8;
  color: var(--text-secondary);
}

/* ===================================
   FAQ Section
   =================================== */
.faq {
  padding: var(--spacing-3xl) var(--spacing-md);
  background: var(--background-darker);
}

.faq-container {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  margin-bottom: var(--spacing-md);
  overflow: hidden;
  transition: all var(--transition-base);
}

.faq-item:hover {
  border-color: var(--primary-gradient-start);
}

.faq-question {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-lg);
  background: transparent;
  color: var(--text-primary);
  font-size: 1.125rem;
  font-weight: 600;
  text-align: left;
  cursor: pointer;
}

.faq-icon {
  transition: transform var(--transition-base);
  flex-shrink: 0;
}

.faq-item.active .faq-icon {
  transform: rotate(180deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-base);
}

.faq-item.active .faq-answer {
  max-height: 500px;
}

.faq-answer p {
  padding: 0 var(--spacing-lg) var(--spacing-lg);
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ===================================
   CTA Section
   =================================== */
.cta-section {
  padding: var(--spacing-3xl) var(--spacing-md);
  background: 
    linear-gradient(135deg, rgba(99, 102, 241, 0.1), rgba(139, 92, 246, 0.1)),
    var(--background-dark);
  text-align: center;
}

.cta-content {
  max-width: 700px;
  margin: 0 auto;
}

.cta-title {
  margin-bottom: var(--spacing-md);
}

.cta-description {
  font-size: 1.25rem;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-xl);
}

.cta-buttons {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
}

/* ===================================
   Footer
   =================================== */
.footer {
  background: var(--background-darker);
  border-top: 1px solid var(--border);
  padding: var(--spacing-3xl) var(--spacing-md) var(--spacing-lg);
}

.footer-content {
  max-width: var(--container-max);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
}

.footer-title {
  color: var(--text-primary);
  margin-bottom: var(--spacing-md);
  font-size: 1.125rem;
}

.footer-description {
  color: var(--text-muted);
  font-size: 0.875rem;
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: var(--spacing-sm);
}

.footer-links a {
  color: var(--text-secondary);
  font-size: 0.875rem;
  transition: color var(--transition-fast);
}

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

.footer-bottom {
  max-width: var(--container-max);
  margin: 0 auto;
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--border);
  text-align: center;
  color: var(--text-muted);
  font-size: 0.875rem;
}

/* ===================================
   Animations
   =================================== */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

/* ===================================
   Responsive Design
   =================================== */
@media (max-width: 1024px) {
  .hero-content {
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
  }
  
  .hero-image {
    order: -1;
  }
  
  .step {
    grid-template-columns: 80px 1fr;
    gap: var(--spacing-md);
  }
  
  .step-image {
    grid-column: 1 / -1;
    margin-top: var(--spacing-md);
  }
  
  .step-reverse {
    direction: ltr;
  }
}

@media (max-width: 768px) {
  :root {
    --spacing-3xl: 3rem;
    --spacing-2xl: 2.5rem;
  }
  
  .nav-menu {
    display: none;
  }
  
  .mobile-menu-toggle {
    display: flex;
  }
  
  .hero {
    min-height: auto;
    padding-top: calc(var(--spacing-2xl) + 60px);
  }
  
  .hero-buttons {
    flex-direction: column;
  }
  
  .hero-stats {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }
  
  .features-grid {
    grid-template-columns: 1fr;
  }
  
  .step {
    grid-template-columns: 1fr;
  }
  
  .step-number {
    font-size: 2.5rem;
  }
  
  .comparison-row {
    grid-template-columns: 1.5fr 1fr 1fr;
  }
  
  .comparison-cell {
    padding: var(--spacing-sm);
    font-size: 0.875rem;
  }
  
  .pricing-grid {
    grid-template-columns: 1fr;
  }
  
  .pricing-featured {
    transform: scale(1);
  }
  
  .cta-buttons {
    flex-direction: column;
  }
  
  .footer-content {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 1.75rem;
  }
  
  .hero-subtitle {
    font-size: 1.125rem;
  }
  
  .hero-description,
  .hero-cta-text {
    font-size: 1rem;
  }
  
  .section-title {
    font-size: 1.75rem;
  }
  
  .price-amount {
    font-size: 2.5rem;
  }
}

/* ===================================
   Print Styles
   =================================== */
@media print {
  .header,
  .cta-section,
  .footer {
    display: none;
  }
}

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

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