/* === LiteChat Website Styles === */

/* CSS Variables */
:root {
  /* Colors */
  --bg-primary: #ffffff;
  --bg-secondary: #fafafa;
  --bg-tertiary: #f5f5f5;
  --text-primary: #1a1a1a;
  --text-secondary: #4a4a4a;
  --text-tertiary: #6b6b6b;
  --text-muted: #9a9a9a;
  --border-color: #e5e5e5;
  --accent: #1a1a1a;
  --accent-hover: #333333;
  
  /* Typography */
  --font-display: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Segoe UI', Roboto, sans-serif;
  --font-body: -apple-system, BlinkMacSystemFont, 'SF Pro Text', 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'SF Mono', 'JetBrains Mono', 'Consolas', monospace;
  
  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  --space-3xl: 64px;
  --space-4xl: 96px;
  
  /* Border Radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
}

/* Reset */
*, *::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: 16px;
  line-height: 1.6;
  color: var(--text-primary);
  background: var(--bg-primary);
}

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

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

/* === Header === */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-color);
  transition: all 0.3s ease;
}

.header-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--space-md) var(--space-xl);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 20px;
  font-weight: 600;
  color: var(--text-primary);
}

.logo img {
  width: 32px;
  height: 32px;
}

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

.nav a {
  font-size: 15px;
  color: var(--text-secondary);
  transition: color 0.2s ease;
}

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

.nav-cta {
  padding: 10px 20px;
  background: var(--accent);
  color: white !important;
  border-radius: var(--radius-md);
  font-weight: 500;
  transition: all 0.2s ease;
}

.nav-cta:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
}

/* === Hero === */
.hero {
  padding: 160px var(--space-xl) 100px;
  text-align: center;
  max-width: 1200px;
  margin: 0 auto;
}

.hero-badge {
  display: inline-block;
  padding: 8px 16px;
  background: var(--bg-tertiary);
  border-radius: 100px;
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: var(--space-xl);
}

.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(48px, 8vw, 80px);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  margin-bottom: var(--space-lg);
}

.hero p {
  font-size: clamp(18px, 2.5vw, 24px);
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto var(--space-2xl);
  line-height: 1.5;
}

.hero-buttons {
  display: flex;
  justify-content: center;
  gap: var(--space-md);
  flex-wrap: wrap;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 16px 32px;
  background: var(--accent);
  color: white;
  font-size: 17px;
  font-weight: 500;
  border-radius: var(--radius-lg);
  transition: all 0.2s ease;
}

.btn-primary:hover {
  background: var(--accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 16px 32px;
  background: var(--bg-primary);
  color: var(--text-primary);
  font-size: 17px;
  font-weight: 500;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  transition: all 0.2s ease;
}

.btn-secondary:hover {
  background: var(--bg-tertiary);
  transform: translateY(-2px);
}

/* === Demo Section === */
.demo {
  padding: var(--space-4xl) var(--space-xl);
  max-width: 1200px;
  margin: 0 auto;
}

.demo-image {
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: 0 24px 64px rgba(0, 0, 0, 0.12);
  border: 1px solid var(--border-color);
}

.demo-image img {
  width: 100%;
  display: block;
}

/* === Features === */
.features {
  padding: var(--space-4xl) var(--space-xl);
  background: var(--bg-secondary);
}

.features-content {
  max-width: 1200px;
  margin: 0 auto;
}

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

.section-header h2 {
  font-family: var(--font-display);
  font-size: clamp(36px, 5vw, 56px);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-md);
}

.section-header p {
  font-size: 18px;
  color: var(--text-secondary);
  max-width: 500px;
  margin: 0 auto;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-xl);
}

.feature-card {
  padding: var(--space-xl);
  background: var(--bg-primary);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  transition: all 0.3s ease;
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.08);
}

.feature-icon {
  width: 48px;
  height: 48px;
  background: var(--bg-tertiary);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-lg);
}

.feature-icon svg {
  width: 24px;
  height: 24px;
  stroke: var(--text-primary);
}

.feature-card h3 {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: var(--space-sm);
}

.feature-card p {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* === Screenshots === */
.screenshots {
  padding: var(--space-4xl) var(--space-xl);
  max-width: 1200px;
  margin: 0 auto;
}

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

.screenshot-item {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border-color);
  transition: all 0.3s ease;
}

.screenshot-item:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.1);
}

.screenshot-item img {
  width: 100%;
  display: block;
}

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

.cta-content {
  max-width: 600px;
  margin: 0 auto;
}

.cta h2 {
  font-family: var(--font-display);
  font-size: clamp(36px, 5vw, 48px);
  font-weight: 700;
  line-height: 1.1;
  margin-bottom: var(--space-lg);
}

.cta p {
  font-size: 18px;
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: var(--space-2xl);
}

.btn-white {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 16px 32px;
  background: white;
  color: var(--text-primary);
  font-size: 17px;
  font-weight: 500;
  border-radius: var(--radius-lg);
  transition: all 0.2s ease;
}

.btn-white:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(255, 255, 255, 0.2);
}

/* === Footer === */
.footer {
  padding: var(--space-3xl) var(--space-xl);
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-2xl);
}

.footer-brand {
  max-width: 300px;
}

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

.footer-brand p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
}

.footer-links h4 {
  font-size: 14px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: var(--space-md);
}

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

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

.footer-links a {
  font-size: 15px;
  color: var(--text-secondary);
  transition: color 0.2s ease;
}

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

.footer-bottom {
  max-width: 1200px;
  margin: var(--space-2xl) auto 0;
  padding-top: var(--space-xl);
  border-top: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 14px;
  color: var(--text-muted);
}

.footer-social {
  display: flex;
  gap: var(--space-md);
}

.footer-social a {
  color: var(--text-muted);
  transition: color 0.2s ease;
}

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

/* === Legal Pages === */
.legal {
  padding: 160px var(--space-xl) 100px;
  max-width: 800px;
  margin: 0 auto;
}

.legal h1 {
  font-family: var(--font-display);
  font-size: clamp(36px, 5vw, 48px);
  font-weight: 700;
  line-height: 1.1;
  margin-bottom: var(--space-md);
}

.legal .update-date {
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: var(--space-3xl);
}

.legal h2 {
  font-size: 24px;
  font-weight: 600;
  margin: var(--space-2xl) 0 var(--space-md);
}

.legal h3 {
  font-size: 20px;
  font-weight: 600;
  margin: var(--space-xl) 0 var(--space-md);
}

.legal p {
  font-size: 16px;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: var(--space-md);
}

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

.legal li {
  font-size: 16px;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: var(--space-sm);
}

.legal a {
  color: var(--text-primary);
  text-decoration: underline;
  text-underline-offset: 2px;
}

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

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

.animate-in {
  animation: fadeInUp 0.6s ease-out forwards;
  opacity: 0;
}

.animate-in:nth-child(2) { animation-delay: 0.1s; }
.animate-in:nth-child(3) { animation-delay: 0.2s; }
.animate-in:nth-child(4) { animation-delay: 0.3s; }

/* === Responsive === */
@media (max-width: 1024px) {
  .footer-content {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xl);
  }
}

@media (max-width: 768px) {
  .nav {
    display: none;
  }
  
  .hero {
    padding: 120px var(--space-md) 60px;
  }
  
  .hero-buttons {
    flex-direction: column;
    align-items: center;
  }
  
  .btn-primary, .btn-secondary, .btn-white {
    width: 100%;
    max-width: 300px;
    justify-content: center;
  }
  
  .screenshots-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-content {
    grid-template-columns: 1fr;
  }
  
  .footer-bottom {
    flex-direction: column;
    gap: var(--space-md);
    text-align: center;
  }
}

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