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

:root {
  --primary: #6366f1;
  --primary-dark: #4f46e5;
  --primary-light: #e0e7ff;
  --bg: #ffffff;
  --bg-secondary: #f8fafc;
  --text: #1e293b;
  --text-secondary: #64748b;
  --border: #e2e8f0;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  color: var(--text);
  line-height: 1.6;
  background: var(--bg);
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Navigation */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  z-index: 100;
}

.nav-content {
  max-width: 1100px;
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text);
  font-weight: 600;
  font-size: 18px;
}

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

.nav-links a {
  text-decoration: none;
  color: var(--text-secondary);
  font-size: 14px;
  transition: color 0.2s;
}

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

.github-link {
  display: flex;
  align-items: center;
  gap: 6px;
}

/* Hero */
.hero {
  padding: 160px 24px 100px;
  text-align: center;
  background: linear-gradient(180deg, var(--primary-light) 0%, var(--bg) 100%);
}

.hero-content {
  max-width: 700px;
  margin: 0 auto;
}

.hero-icon {
  margin-bottom: 24px;
}

.hero-icon img {
  border-radius: 24px;
  box-shadow: 0 20px 60px rgba(99, 102, 241, 0.3);
}

.hero h1 {
  font-size: 56px;
  font-weight: 700;
  margin-bottom: 16px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.tagline {
  font-size: 20px;
  color: var(--text-secondary);
  margin-bottom: 40px;
  line-height: 1.5;
}

.open-source-badge {
  color: var(--text-secondary);
  font-size: 15px;
  margin-bottom: 32px;
}

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

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 500;
  text-decoration: none;
  transition: all 0.2s;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  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, 0.5);
}

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

.btn-secondary:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.btn-large {
  padding: 16px 32px;
  font-size: 17px;
}

/* Features */
.features {
  padding: 100px 24px;
}

.features h2 {
  text-align: center;
  font-size: 36px;
  margin-bottom: 60px;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
}

.feature {
  text-align: center;
  padding: 24px;
}

.feature-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--primary-light);
  border-radius: 16px;
  color: var(--primary);
}

.feature h3 {
  font-size: 18px;
  margin-bottom: 12px;
}

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

/* Screenshot */
.screenshot {
  padding: 40px 24px 100px;
}

.screenshot-img {
  width: 100%;
  max-width: 1000px;
  margin: 0 auto;
  display: block;
  border-radius: 12px;
  box-shadow: 0 25px 80px rgba(0, 0, 0, 0.15);
  border: 1px solid var(--border);
}

/* Open Source Section */
.open-source {
  padding: 100px 24px;
  background: var(--bg-secondary);
}

.open-source-content {
  text-align: center;
  max-width: 600px;
  margin: 0 auto;
}

.open-source-icon {
  width: 80px;
  height: 80px;
  margin: 0 auto 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--primary-light);
  border-radius: 20px;
  color: var(--primary);
}

.open-source h2 {
  font-size: 32px;
  margin-bottom: 16px;
}

.open-source > .container > .open-source-content > p {
  color: var(--text-secondary);
  font-size: 17px;
  margin-bottom: 32px;
}

.open-source-features {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 16px 32px;
  margin-bottom: 32px;
}

.os-feature {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text);
  font-size: 15px;
}

.os-feature svg {
  color: var(--primary);
}

/* Download */
.download {
  padding: 100px 24px;
  background: var(--bg-secondary);
  text-align: center;
}

.download h2 {
  font-size: 36px;
  margin-bottom: 16px;
}

.download > .container > p {
  color: var(--text-secondary);
  margin-bottom: 32px;
}

.download-buttons {
  margin-bottom: 24px;
}

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

.download-note a {
  color: var(--primary);
  text-decoration: none;
}

.download-note a:hover {
  text-decoration: underline;
}

/* Footer */
.footer {
  padding: 40px 24px;
  border-top: 1px solid var(--border);
}

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

.footer-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
}

.footer-links {
  display: flex;
  gap: 24px;
}

.footer-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 14px;
}

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

.copyright {
  text-align: center;
  color: var(--text-secondary);
  font-size: 14px;
}

/* Responsive */
@media (max-width: 768px) {
  .nav-links {
    display: none;
  }

  .hero {
    padding: 120px 24px 60px;
  }

  .hero h1 {
    font-size: 40px;
  }

  .tagline {
    font-size: 18px;
  }

  .features-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .screenshot-placeholder {
    height: 300px;
  }

  .footer-content {
    flex-direction: column;
    gap: 24px;
  }
}