/* ==========================================
   FACTX Landing Page Styles
   Dark theme, minimal crypto aesthetic
   ========================================== */

/* CSS Variables */
:root {
  /* Colors */
  --color-bg: #0a0a0b;
  --color-bg-elevated: #111113;
  --color-bg-card: #16161a;
  --color-bg-card-hover: #1c1c21;
  
  --color-primary: #6366f1;
  --color-primary-dark: #4f46e5;
  --color-primary-light: #818cf8;
  --color-primary-glow: rgba(99, 102, 241, 0.3);
  
  --color-accent: #22d3ee;
  --color-accent-glow: rgba(34, 211, 238, 0.2);
  
  --color-text: #fafafa;
  --color-text-secondary: #a1a1aa;
  --color-text-muted: #71717a;
  
  --color-border: #27272a;
  --color-border-light: #3f3f46;
  
  --color-success: #22c55e;
  --color-warning: #f59e0b;
  --color-danger: #ef4444;
  
  /* Typography */
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-display: 'Space Grotesk', 'Inter', sans-serif;
  
  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;
  
  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 200ms ease;
  --transition-slow: 300ms ease;
  
  /* Container */
  --container-max: 1200px;
  --container-padding: 1.5rem;
}

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

html {
  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-bg);
  overflow-x: hidden;
}

body.menu-open {
  overflow: hidden;
}

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

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

ul, ol {
  list-style: none;
}

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

/* ==========================================
   Typography
   ========================================== */

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-text);
}

/* ==========================================
   Buttons
   ========================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  font-family: var(--font-body);
  font-weight: 500;
  text-align: center;
  white-space: nowrap;
  cursor: pointer;
  border: none;
  border-radius: var(--radius-lg);
  transition: all var(--transition-base);
}

.btn-sm {
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
}

.btn-md {
  padding: 0.75rem 1.5rem;
  font-size: 1rem;
}

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

.btn-primary {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  color: white;
  box-shadow: 0 4px 14px var(--color-primary-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px var(--color-primary-glow);
}

.btn-outline {
  background: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-border-light);
}

.btn-outline:hover {
  background: var(--color-bg-card);
  border-color: var(--color-primary);
}

.btn-ghost {
  background: transparent;
  color: var(--color-text-secondary);
}

.btn-ghost:hover {
  color: var(--color-text);
}

.btn-block {
  width: 100%;
}

.btn-icon {
  width: 1.25em;
  height: 1.25em;
}

.btn-icon-right {
  width: 1em;
  height: 1em;
}

/* ==========================================
   Navbar
   ========================================== */

.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: var(--space-lg) 0;
  transition: all var(--transition-slow);
}

.navbar.scrolled {
  padding: var(--space-md) 0;
  background: rgba(10, 10, 11, 0.8);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}

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

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
}

.logo-icon {
  color: var(--color-primary);
  font-size: 1.75rem;
}

.nav-links {
  display: none;
  align-items: center;
  gap: var(--space-xl);
}

.nav-links a {
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
}

.nav-links a:hover {
  color: var(--color-text);
}

@media (min-width: 768px) {
  .nav-links {
    display: flex;
  }
  
  .mobile-menu-btn {
    display: none;
  }
}

/* Mobile Menu Button */
.mobile-menu-btn {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  background: none;
  border: none;
  cursor: pointer;
}

.mobile-menu-btn span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  transition: all var(--transition-base);
}

.mobile-menu-btn.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-btn.active span:nth-child(2) {
  opacity: 0;
}

.mobile-menu-btn.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* Mobile Menu */
.mobile-menu {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 99;
  background: var(--color-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-slow);
}

.mobile-menu.active {
  opacity: 1;
  visibility: visible;
}

.mobile-menu-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-xl);
}

.mobile-link {
  font-family: var(--font-display);
  font-size: 1.5rem;
  color: var(--color-text-secondary);
}

.mobile-link:hover {
  color: var(--color-text);
}

/* ==========================================
   Hero Section
   ========================================== */

.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: var(--space-4xl) 0;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-glow {
  position: absolute;
  top: -30%;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, var(--color-primary-glow) 0%, transparent 70%);
  pointer-events: none;
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image: 
    linear-gradient(rgba(99, 102, 241, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(99, 102, 241, 0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 80% 80% at 50% 50%, black 40%, transparent 100%);
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 700px;
  margin: 0 auto;
  text-align: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-xl);
}

.badge-dot {
  width: 8px;
  height: 8px;
  background: var(--color-success);
  border-radius: 50%;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

.hero-title {
  font-size: clamp(3rem, 12vw, 6rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-md);
}

.title-accent {
  background: linear-gradient(135deg, var(--color-text), var(--color-primary-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: clamp(1.25rem, 3vw, 1.75rem);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-md);
}

.hero-description {
  font-size: 1.125rem;
  color: var(--color-text-muted);
  max-width: 500px;
  margin: 0 auto var(--space-xl);
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  justify-content: center;
  margin-bottom: var(--space-3xl);
}

.hero-stats {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-lg);
  flex-wrap: wrap;
}

.stat {
  text-align: center;
}

.stat-value {
  display: block;
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text);
}

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

.stat-divider {
  width: 1px;
  height: 40px;
  background: var(--color-border);
}

@media (max-width: 640px) {
  .stat-divider {
    display: none;
  }
  
  .hero-stats {
    gap: var(--space-xl);
  }
}

/* ==========================================
   Sections
   ========================================== */

.section {
  padding: var(--space-4xl) 0;
}

.section-header {
  text-align: center;
  max-width: 600px;
  margin: 0 auto var(--space-3xl);
}

.section-tag {
  display: inline-block;
  padding: var(--space-xs) var(--space-md);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-primary-light);
  margin-bottom: var(--space-md);
}

.section-title {
  font-size: clamp(2rem, 5vw, 3rem);
  margin-bottom: var(--space-md);
}

.section-subtitle {
  font-size: 1.125rem;
  color: var(--color-text-muted);
}

/* ==========================================
   How It Works
   ========================================== */

.how-it-works {
  background: var(--color-bg-elevated);
}

.steps-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
}

@media (min-width: 1024px) {
  .steps-grid {
    grid-template-columns: repeat(7, 1fr);
    align-items: start;
  }
  
  .step-card {
    grid-column: span 1;
  }
  
  .step-connector {
    display: flex;
    align-items: center;
    justify-content: center;
    padding-top: 4rem;
  }
}

.step-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  text-align: center;
  transition: all var(--transition-base);
}

.step-card:hover {
  background: var(--color-bg-card-hover);
  border-color: var(--color-border-light);
  transform: translateY(-4px);
}

.step-number {
  font-family: var(--font-display);
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--space-md);
}

.step-icon {
  width: 48px;
  height: 48px;
  margin: 0 auto var(--space-md);
  color: var(--color-text-secondary);
}

.step-icon svg {
  width: 100%;
  height: 100%;
}

.step-title {
  font-size: 1.125rem;
  margin-bottom: var(--space-sm);
}

.step-description {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
}

.step-connector {
  display: none;
  color: var(--color-border-light);
}

.step-connector svg {
  width: 24px;
  height: 24px;
}

/* ==========================================
   Economy
   ========================================== */

.economy-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
}

@media (min-width: 768px) {
  .economy-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.economy-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  transition: all var(--transition-base);
}

.economy-card:hover {
  border-color: var(--color-primary);
  box-shadow: 0 0 30px var(--color-primary-glow);
}

.economy-icon {
  width: 48px;
  height: 48px;
  margin-bottom: var(--space-md);
  color: var(--color-primary-light);
}

.economy-icon svg {
  width: 100%;
  height: 100%;
}

.economy-title {
  font-size: 1.25rem;
  margin-bottom: var(--space-sm);
}

.economy-description {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  margin-bottom: var(--space-lg);
}

.economy-highlight {
  display: flex;
  align-items: baseline;
  gap: var(--space-sm);
  padding: var(--space-md);
  background: var(--color-bg);
  border-radius: var(--radius-md);
}

.highlight-value {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-primary-light);
}

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

/* ==========================================
   Features
   ========================================== */

.features {
  background: var(--color-bg-elevated);
}

.features-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
}

@media (min-width: 640px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .features-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.feature-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-md);
  padding: var(--space-lg);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: all var(--transition-base);
}

.feature-item:hover {
  background: var(--color-bg-card-hover);
}

.feature-icon {
  font-size: 1.5rem;
  flex-shrink: 0;
}

.feature-content h4 {
  font-size: 1rem;
  margin-bottom: var(--space-xs);
}

.feature-content p {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

/* ==========================================
   Disclaimer
   ========================================== */

.disclaimer-box {
  max-width: 800px;
  margin: 0 auto;
  padding: var(--space-xl);
  background: var(--color-bg-card);
  border: 1px solid var(--color-warning);
  border-radius: var(--radius-xl);
}

.disclaimer-icon {
  width: 48px;
  height: 48px;
  margin-bottom: var(--space-md);
  color: var(--color-warning);
}

.disclaimer-icon svg {
  width: 100%;
  height: 100%;
}

.disclaimer-title {
  font-size: 1.25rem;
  margin-bottom: var(--space-lg);
}

.disclaimer-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.disclaimer-list li {
  padding-left: var(--space-lg);
  position: relative;
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
}

.disclaimer-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.5em;
  width: 6px;
  height: 6px;
  background: var(--color-warning);
  border-radius: 50%;
}

.disclaimer-list li strong {
  color: var(--color-text);
}

/* ==========================================
   CTA Section
   ========================================== */

.cta {
  text-align: center;
  background: linear-gradient(180deg, var(--color-bg) 0%, var(--color-bg-elevated) 100%);
}

.cta-content {
  max-width: 500px;
  margin: 0 auto;
}

.cta-title {
  font-size: clamp(2rem, 5vw, 3rem);
  margin-bottom: var(--space-md);
}

.cta-subtitle {
  font-size: 1.125rem;
  color: var(--color-text-muted);
  margin-bottom: var(--space-xl);
}

/* ==========================================
   Footer
   ========================================== */

.footer {
  padding: var(--space-3xl) 0 var(--space-xl);
  background: var(--color-bg-elevated);
  border-top: 1px solid var(--color-border);
}

.footer-content {
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
  margin-bottom: var(--space-xl);
}

@media (min-width: 768px) {
  .footer-content {
    flex-direction: row;
    justify-content: space-between;
    align-items: flex-start;
  }
}

.footer-brand .logo {
  margin-bottom: var(--space-sm);
}

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

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md) var(--space-xl);
}

.footer-links a {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
}

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

.footer-bottom {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  padding-top: var(--space-xl);
  border-top: 1px solid var(--color-border);
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

@media (min-width: 640px) {
  .footer-bottom {
    flex-direction: row;
    justify-content: space-between;
  }
}

.footer-domain {
  color: var(--color-text-secondary);
}