/* GraphFoundry AI - Liquid Glass Design System */

/* ============================================
   CSS VARIABLES & RESET
   ============================================ */
:root {
  /* Colors */
  --bg-primary: #0a0a0f;
  --bg-secondary: #1a1a2e;
  --gradient-start: #10b981;
  --gradient-end: #3b82f6;
  --accent: #06b6d4;
  --text-primary: #ffffff;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  --glass-bg: rgba(255, 255, 255, 0.05);
  --glass-border: rgba(255, 255, 255, 0.1);
  
  /* Border Radius - ONLY TWO VALUES */
  --radius-2xl: 16px;
  --radius-full: 9999px;
  
  /* Transitions */
  --ease-smooth: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-bounce: cubic-bezier(0.34, 1.56, 0.64, 1);
}

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

html {
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}

/* ============================================
   GLASS EFFECT
   ============================================ */
.glass {
  background: var(--glass-bg);
  backdrop-filter: blur(20px) saturate(150%) brightness(110%);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-2xl);
}

@supports not (backdrop-filter: blur(20px)) {
  .glass {
    background: rgba(26, 26, 46, 0.85);
  }
}

/* ============================================
   CONTAINER & LAYOUT
   ============================================ */
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ============================================
   NAVIGATION
   ============================================ */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 16px 0;
  transition: all 0.3s var(--ease-smooth);
}

.nav.scrolled {
  background: var(--glass-bg);
  backdrop-filter: blur(20px) saturate(150%) brightness(110%);
  border-bottom: 1px solid var(--glass-border);
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
  text-decoration: none;
}

.logo-icon {
  width: 32px;
  height: 32px;
  color: var(--gradient-start);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.3s var(--ease-smooth);
}

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

/* ============================================
   BUTTONS
   ============================================ */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  color: var(--text-primary);
  font-weight: 600;
  text-decoration: none;
  border-radius: var(--radius-2xl);
  border: none;
  cursor: pointer;
  transition: all 0.3s var(--ease-bounce);
  box-shadow: 0 4px 20px rgba(16, 185, 129, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(16, 185, 129, 0.4);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  color: var(--text-primary);
  font-weight: 600;
  border-radius: var(--radius-2xl);
  border: 1px solid var(--glass-border);
  cursor: pointer;
  transition: all 0.3s var(--ease-smooth);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.2);
}

.btn-large {
  padding: 16px 32px;
  font-size: 18px;
}

.btn-icon {
  width: 20px;
  height: 20px;
}

/* ============================================
   HERO SECTION
   ============================================ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  padding-top: 80px;
}

.hero-canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
}

.hero-content {
  position: relative;
  z-index: 10;
  text-align: center;
  max-width: 900px;
  margin: 0 auto;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-full);
  font-size: 14px;
  font-weight: 500;
  color: var(--accent);
  margin-bottom: 32px;
}

.badge-icon {
  width: 16px;
  height: 16px;
}

.hero-title {
  font-size: 64px;
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 24px;
  background: linear-gradient(135deg, var(--text-primary) 0%, var(--accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 24px;
  color: var(--text-secondary);
  margin-bottom: 48px;
  line-height: 1.5;
}

.hero-buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ============================================
   SECTIONS
   ============================================ */
section {
  padding: 120px 0;
}

.section-title {
  font-size: 48px;
  font-weight: 700;
  text-align: center;
  margin-bottom: 16px;
}

.section-subtitle {
  font-size: 20px;
  color: var(--text-secondary);
  text-align: center;
  margin-bottom: 64px;
}

/* ============================================
   FEATURES SECTION
   ============================================ */
.features {
  background: radial-gradient(circle at top, rgba(16, 185, 129, 0.1) 0%, transparent 50%);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 32px;
}

.feature-card {
  padding: 32px;
  transition: all 0.3s var(--ease-smooth);
}

.feature-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 20px 40px rgba(16, 185, 129, 0.2);
}

.feature-icon {
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  border-radius: var(--radius-2xl);
  margin-bottom: 24px;
}

.feature-icon svg {
  width: 32px;
  height: 32px;
  color: white;
}

.feature-title {
  font-size: 24px;
  font-weight: 600;
  margin-bottom: 12px;
}

.feature-description {
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ============================================
   DEMO SECTION
   ============================================ */
.demo {
  background: linear-gradient(180deg, transparent 0%, rgba(59, 130, 246, 0.05) 100%);
}

.demo-container {
  position: relative;
  padding: 48px;
  min-height: 600px;
}

.demo-canvas {
  width: 100%;
  height: 500px;
  border-radius: var(--radius-2xl);
}

.demo-metrics {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 24px;
  margin-top: 32px;
}

.metric {
  text-align: center;
  padding: 24px;
  background: rgba(255, 255, 255, 0.03);
  border-radius: var(--radius-2xl);
  border: 1px solid rgba(255, 255, 255, 0.05);
}

.metric-value {
  font-size: 48px;
  font-weight: 700;
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 8px;
}

.metric-label {
  font-size: 14px;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 1px;
}

/* ============================================
   BENEFITS SECTION
   ============================================ */
.benefits-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 24px;
}

.benefit-card {
  padding: 32px;
  text-align: center;
  transition: all 0.3s var(--ease-smooth);
}

.benefit-card:hover {
  transform: scale(1.05);
  box-shadow: 0 15px 35px rgba(6, 182, 212, 0.2);
}

.benefit-title {
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--accent);
}

.benefit-description {
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ============================================
   USE CASES SECTION
   ============================================ */
.use-cases {
  background: radial-gradient(circle at bottom, rgba(59, 130, 246, 0.1) 0%, transparent 50%);
}

.use-cases-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 32px;
}

.use-case-card {
  padding: 40px;
  text-align: center;
  transition: all 0.3s var(--ease-smooth);
}

.use-case-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 20px 40px rgba(59, 130, 246, 0.2);
}

.use-case-icon {
  font-size: 64px;
  margin-bottom: 24px;
  display: block;
}

.use-case-title {
  font-size: 24px;
  font-weight: 600;
  margin-bottom: 12px;
}

.use-case-description {
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ============================================
   CTA SECTION
   ============================================ */
.cta {
  padding: 120px 0;
}

.cta-content {
  max-width: 800px;
  margin: 0 auto;
  padding: 64px 48px;
  text-align: center;
}

.cta-title {
  font-size: 48px;
  font-weight: 700;
  margin-bottom: 16px;
}

.cta-subtitle {
  font-size: 20px;
  color: var(--text-secondary);
  margin-bottom: 40px;
}

.cta-form {
  display: flex;
  gap: 16px;
  max-width: 600px;
  margin: 0 auto 32px;
}

.cta-input {
  flex: 1;
  padding: 16px 24px;
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-2xl);
  color: var(--text-primary);
  font-size: 16px;
  outline: none;
  transition: all 0.3s var(--ease-smooth);
}

.cta-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(6, 182, 212, 0.1);
}

.cta-input::placeholder {
  color: var(--text-muted);
}

.trust-signals {
  display: flex;
  justify-content: center;
  gap: 32px;
  flex-wrap: wrap;
  font-size: 14px;
  color: var(--text-secondary);
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
  background: rgba(10, 10, 15, 0.8);
  border-top: 1px solid var(--glass-border);
  padding: 64px 0 32px;
}

.footer-content {
  display: grid;
  grid-template-columns: 2fr 3fr;
  gap: 64px;
  margin-bottom: 48px;
}

.footer-brand .logo {
  margin-bottom: 16px;
}

.footer-tagline {
  color: var(--text-secondary);
  font-size: 14px;
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 48px;
}

.footer-column h4 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 16px;
  color: var(--text-primary);
}

.footer-column a {
  display: block;
  color: var(--text-secondary);
  text-decoration: none;
  margin-bottom: 12px;
  font-size: 14px;
  transition: color 0.3s var(--ease-smooth);
}

.footer-column a:hover {
  color: var(--accent);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 32px;
  border-top: 1px solid var(--glass-border);
  color: var(--text-muted);
  font-size: 14px;
}

.social-links {
  display: flex;
  gap: 16px;
}

.social-links a {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--glass-bg);
  border-radius: var(--radius-full);
  color: var(--text-secondary);
  transition: all 0.3s var(--ease-smooth);
}

.social-links a:hover {
  background: var(--accent);
  color: var(--text-primary);
  transform: translateY(-4px);
}

.social-links svg {
  width: 20px;
  height: 20px;
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */
@media (max-width: 1024px) {
  .hero-title {
    font-size: 48px;
  }
  
  .hero-subtitle {
    font-size: 20px;
  }
  
  .section-title {
    font-size: 40px;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }
  
  .hero {
    min-height: 80vh;
    padding-top: 60px;
  }
  
  .hero-title {
    font-size: 36px;
  }
  
  .hero-subtitle {
    font-size: 18px;
  }
  
  .hero-buttons {
    flex-direction: column;
  }
  
  .section-title {
    font-size: 32px;
  }
  
  .section-subtitle {
    font-size: 18px;
  }
  
  section {
    padding: 80px 0;
  }
  
  .demo-container {
    padding: 24px;
  }
  
  .demo-canvas {
    height: 400px;
  }
  
  .cta-form {
    flex-direction: column;
  }
  
  .footer-content {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  
  .footer-links {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  
  .footer-bottom {
    flex-direction: column;
    gap: 16px;
    text-align: center;
  }
  
  .trust-signals {
    flex-direction: column;
    gap: 12px;
  }
}

/* ============================================
   ACCESSIBILITY
   ============================================ */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 4px;
}

.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;
}