:root {
  /* Colors */
  --bg-primary: #0f0f13;
  --bg-secondary: #18181c;
  --text-primary: #ffffff;
  --text-secondary: #a1a1aa;
  
  --accent-blue: #6366f1;
  --accent-purple: #a855f7;
  
  /* Glassmorphism */
  --glass-bg: rgba(24, 24, 28, 0.6);
  --glass-border: rgba(255, 255, 255, 0.08);
  
  /* Fonts */
  --font-family: 'Inter', system-ui, -apple-system, sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  position: relative;
}

/* Ambient Background Glow */
body::before {
  content: '';
  position: absolute;
  top: -200px;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 600px;
  background: radial-gradient(circle, rgba(99, 102, 241, 0.15) 0%, rgba(15, 15, 19, 0) 70%);
  z-index: -1;
  pointer-events: none;
}

/* Navigation */
.navbar {
  position: fixed;
  top: 0;
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem 5%;
  background: rgba(15, 15, 19, 0.8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--glass-border);
  z-index: 1000;
  transition: all 0.3s ease;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 1rem;
  font-weight: 700;
  font-size: 1.25rem;
  text-decoration: none;
  color: var(--text-primary);
}

.nav-brand img {
  height: 32px;
}

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

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

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

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  border-radius: 8px;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.2s ease;
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
  color: white;
  box-shadow: 0 4px 14px rgba(99, 102, 241, 0.4);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(99, 102, 241, 0.6);
}

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

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.05);
  border-color: rgba(255, 255, 255, 0.15);
}

/* Hero Section */
.hero {
  padding: 10rem 5% 6rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  min-height: 100vh;
}

.hero h1 {
  font-size: clamp(2.5rem, 5vw, 4.5rem);
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 1.5rem;
  background: linear-gradient(to right, #fff, #a1a1aa);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero p {
  font-size: 1.25rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin-bottom: 2.5rem;
}

.hero-cta {
  display: flex;
  gap: 1rem;
  margin-bottom: 4rem;
}

.hero-image {
  width: 100%;
  max-width: 1000px;
  position: relative;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
  border: 1px solid var(--glass-border);
}

.hero-image img {
  width: 100%;
  height: auto;
  display: block;
}

/* Sections */
.section {
  padding: 6rem 5%;
  max-width: 1200px;
  margin: 0 auto;
}

.section-title {
  font-size: 2.5rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 3rem;
}

/* Features Grid */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.feature-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 12px;
  padding: 2rem;
  transition: transform 0.3s ease, border-color 0.3s ease;
  backdrop-filter: blur(10px);
}

.feature-card:hover {
  transform: translateY(-5px);
  border-color: var(--accent-blue);
}

.feature-icon {
  font-size: 2rem;
  margin-bottom: 1rem;
  color: var(--accent-blue);
}

.feature-card h3 {
  font-size: 1.25rem;
  margin-bottom: 1rem;
}

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

/* Downloads Section */
.download-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  align-items: start;
}

.download-card {
  background: linear-gradient(145deg, var(--bg-secondary), var(--bg-primary));
  border: 1px solid var(--accent-blue);
  border-radius: 16px;
  padding: 3rem;
  text-align: center;
  box-shadow: 0 10px 30px rgba(99, 102, 241, 0.1);
}

.download-card h3 {
  font-size: 2rem;
  margin-bottom: 0.5rem;
}

.version-badge {
  display: inline-block;
  background: rgba(99, 102, 241, 0.2);
  color: var(--accent-blue);
  padding: 0.25rem 0.75rem;
  border-radius: 999px;
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 2rem;
}

.past-versions {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 12px;
  padding: 2rem;
}

.past-versions h4 {
  margin-bottom: 1.5rem;
  font-size: 1.25rem;
}

.version-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 0;
  border-bottom: 1px solid var(--glass-border);
}

.version-item:last-child {
  border-bottom: none;
}

.version-item a {
  color: var(--accent-blue);
  text-decoration: none;
}

.version-item a:hover {
  text-decoration: underline;
}

/* FAQ / Support */
.faq-container {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 8px;
  margin-bottom: 1rem;
  overflow: hidden;
}

.faq-question {
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  padding: 1.5rem;
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text-primary);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.faq-question::after {
  content: '+';
  font-size: 1.5rem;
  transition: transform 0.3s ease;
}

.faq-item.active .faq-question::after {
  transform: rotate(45deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
  padding: 0 1.5rem;
  color: var(--text-secondary);
}

.faq-item.active .faq-answer {
  max-height: 200px; /* arbitrary max height for transition */
  padding-bottom: 1.5rem;
}

/* Footer */
.footer {
  border-top: 1px solid var(--glass-border);
  padding: 3rem 5%;
  text-align: center;
  color: var(--text-secondary);
  background: var(--bg-primary);
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 2rem;
  margin: 1.5rem 0;
}

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

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

/* Animations */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* Responsive */
@media (max-width: 768px) {
  .nav-links {
    display: none;
  }
  
  .download-container {
    grid-template-columns: 1fr;
  }
}