:root {
  --primary: #6366f1;
  --primary-dark: #4f46e5;
  --primary-light: #818cf8;
  --secondary: #0ea5e9;
  --accent: #f472b6;
  --bg-dark: #0f0f23;
  --bg-card: #1a1a2e;
  --bg-card-hover: #252542;
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --border: #334155;
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg-dark);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}

/* Animated Background */
.bg-gradient {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(ellipse 80% 50% at 50% -20%, rgba(99, 102, 241, 0.15), transparent),
    radial-gradient(ellipse 60% 40% at 100% 50%, rgba(14, 165, 233, 0.1), transparent),
    radial-gradient(ellipse 60% 40% at 0% 80%, rgba(244, 114, 182, 0.1), transparent);
  z-index: -1;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Navigation */
nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 16px 0;
  background: rgba(15, 15, 35, 0.8);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--text-primary);
  text-decoration: none;
}

.logo img {
  width: 36px;
  height: 36px;
  border-radius: 8px;
}

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

.nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  transition: color 0.2s;
}

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

.github-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text-primary);
  text-decoration: none;
  font-weight: 500;
  transition: all 0.2s;
}

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

.github-btn svg {
  width: 20px;
  height: 20px;
}

.lang-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 12px;
  border-radius: 8px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  transition: all 0.2s;
}

.lang-btn:hover {
  color: var(--text-primary);
  border-color: var(--primary);
  background: rgba(99, 102, 241, 0.08);
}

/* Mobile menu button (present in markup, hidden on desktop) */
.mobile-menu-btn {
  display: none;
  background: transparent;
  border: 0;
  color: var(--text-primary);
}

/* Hero Section */
.hero {
  padding: 160px 0 100px;
  text-align: center;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: rgba(99, 102, 241, 0.1);
  border: 1px solid rgba(99, 102, 241, 0.3);
  border-radius: 100px;
  font-size: 0.875rem;
  color: var(--primary-light);
  margin-bottom: 24px;
}

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

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

h1 {
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 24px;
  background: linear-gradient(135deg, var(--text-primary) 0%, var(--primary-light) 50%, var(--secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: 1.25rem;
  color: var(--text-secondary);
  max-width: 720px;
  margin: 0 auto 40px;
}

.hero-buttons {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-bottom: 60px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 28px;
  border-radius: 12px;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.2s;
  cursor: pointer;
}

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

.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 12px 30px rgba(99, 102, 241, 0.35);
}

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

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

.hero-image {
  width: 100%;
  max-width: 1000px;
  border-radius: 16px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.45);
}

/* Sections */
section {
  padding: 100px 0;
}

.section-title {
  text-align: center;
  margin-bottom: 60px;
}

.section-title h2 {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 16px;
}

.section-title p {
  color: var(--text-secondary);
  font-size: 1.1rem;
}

/* Feature & language cards */
.features-grid,
.languages-grid,
.download-grid {
  display: grid;
  gap: 20px;
}

.features-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.languages-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.download-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.feature-card,
.language-card,
.download-card,
.ai-card {
  background: rgba(26, 26, 46, 0.72);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 16px;
  padding: 24px;
  transition: transform 0.2s, background 0.2s, border-color 0.2s;
}

.feature-card:hover,
.language-card:hover,
.download-card:hover,
.ai-card:hover {
  transform: translateY(-4px);
  background: rgba(37, 37, 66, 0.82);
  border-color: rgba(99, 102, 241, 0.45);
}

.feature-icon,
.language-icon {
  font-size: 2rem;
  margin-bottom: 12px;
}

.feature-card h3,
.language-card h3,
.download-card h3 {
  font-size: 1.25rem;
  margin-bottom: 10px;
}

.feature-card p,
.language-card p,
.download-card p {
  color: var(--text-secondary);
}

/* Download section */
.download .version {
  color: var(--text-muted);
  margin: 10px 0 14px;
  font-size: 0.95rem;
}

.platform-icon svg {
  width: 36px;
  height: 36px;
  fill: currentColor;
  color: var(--text-primary);
}

.download-options {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 14px;
}

.download-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 14px;
  border-radius: 12px;
  background: var(--primary);
  color: white;
  text-decoration: none;
  font-weight: 600;
  transition: all 0.2s;
}

.download-btn:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
}

.download-btn.secondary {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: var(--text-primary);
}

.download-btn.secondary:hover {
  border-color: rgba(99, 102, 241, 0.6);
  background: rgba(99, 102, 241, 0.12);
}

/* Footer */
footer {
  padding: 40px 0;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
}

.footer-links a {
  color: var(--text-secondary);
  text-decoration: none;
}

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

.footer-info {
  text-align: right;
  color: var(--text-secondary);
}

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

/* Responsive */
@media (max-width: 1024px) {
  .features-grid,
  .download-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }
  .mobile-menu-btn {
    display: block;
  }
  .hero {
    padding: 120px 0 60px;
  }
  .hero-buttons {
    flex-direction: column;
    align-items: center;
  }
  .btn {
    width: 100%;
    max-width: 320px;
    justify-content: center;
  }
  .footer-content {
    flex-direction: column;
    text-align: center;
  }
  .footer-info {
    text-align: center;
  }
  .features-grid,
  .languages-grid,
  .download-grid {
    grid-template-columns: 1fr;
  }
}

/* Scroll animations */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.6s ease-out;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}