/* Reset & Base */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --color-bg: #0f172a;
  --color-bg-secondary: #1e293b;
  --color-text: #f1f5f9;
  --color-text-secondary: #94a3b8;
  --color-primary: #3b82f6;
  --color-primary-hover: #2563eb;
  --color-accent: #8b5cf6;
  --color-ai: #a855f7;
  --color-border: #334155;
  --color-card: #1e293b;
}

html {
  scroll-behavior: smooth;
}

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

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Header */
.header {
  background-color: rgba(15, 23, 42, 0.8);
  backdrop-filter: blur(10px);
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  border-bottom: 1px solid var(--color-border);
}

.header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 64px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
}

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

.logo h1 {
  font-size: 1.5rem;
  font-weight: 700;
  background: linear-gradient(135deg, #3b82f6, #8b5cf6);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav {
  display: flex;
  gap: 24px;
}

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

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

.lang-switch {
  color: var(--color-text-secondary);
  font-size: 0.875rem;
  margin-left: 8px;
  padding-left: 16px;
  border-left: 1px solid var(--color-border);
}

.lang-switch a {
  color: var(--color-text-secondary);
  text-decoration: none;
  padding: 2px 4px;
}

.lang-switch a:hover {
  color: var(--color-text);
}

.lang-switch a.active {
  color: var(--color-primary);
  font-weight: 600;
}

/* Hero */
.hero {
  padding: 140px 0 80px;
  text-align: center;
  background: 
    radial-gradient(ellipse 80% 50% at 50% -20%, rgba(59, 130, 246, 0.15), transparent),
    radial-gradient(ellipse 60% 40% at 80% 80%, rgba(139, 92, 246, 0.1), transparent);
}

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

.hero h2 {
  font-size: 3rem;
  font-weight: 800;
  margin-bottom: 16px;
  line-height: 1.2;
}

.hero-desc {
  font-size: 1.25rem;
  color: var(--color-text-secondary);
  margin-bottom: 16px;
}

.hero-mkdocs {
  font-size: 1rem;
  color: var(--color-text-secondary);
  margin-bottom: 24px;
}

.mkdocs-badge {
  display: inline-block;
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.2), rgba(139, 92, 246, 0.2));
  border: 1px solid var(--color-primary);
  color: #60a5fa;
  padding: 4px 12px;
  border-radius: 20px;
  font-weight: 600;
  font-size: 0.9rem;
  margin-right: 8px;
}

.badges {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 32px;
}

.badge {
  padding: 6px 12px;
  border-radius: 20px;
  font-size: 0.875rem;
  font-weight: 500;
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
}

.badge-ai {
  background: linear-gradient(135deg, rgba(168, 85, 247, 0.2), rgba(139, 92, 246, 0.2));
  border-color: var(--color-ai);
  color: #c084fc;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 28px;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.2s;
  border: none;
  cursor: pointer;
}

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

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

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

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

/* AI Section */
.ai-section {
  padding: 80px 0;
  background-color: var(--color-bg-secondary);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  text-align: center;
}

.ai-section h2 {
  font-size: 2rem;
  margin-bottom: 16px;
}

.ai-desc {
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0 auto 32px;
  font-size: 1.1rem;
}

.ai-tools {
  display: flex;
  justify-content: center;
  gap: 24px;
  flex-wrap: wrap;
}

.ai-tool {
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 24px 48px;
}

.ai-tool h3 {
  font-size: 1.25rem;
  margin-bottom: 4px;
  color: var(--color-ai);
}

.ai-tool p {
  color: var(--color-text-secondary);
}

/* Features */
.features {
  padding: 80px 0;
}

.features h2 {
  text-align: center;
  font-size: 2rem;
  margin-bottom: 48px;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.feature-card {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 24px;
  transition: transform 0.2s, border-color 0.2s;
}

.feature-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-primary);
}

.feature-icon {
  font-size: 2rem;
  margin-bottom: 16px;
}

.feature-card h3 {
  font-size: 1.125rem;
  margin-bottom: 8px;
}

.feature-card p {
  color: var(--color-text-secondary);
  font-size: 0.95rem;
}

/* Tech Stack */
.tech-stack {
  padding: 80px 0;
  background-color: var(--color-bg-secondary);
  border-top: 1px solid var(--color-border);
  text-align: center;
}

.tech-stack h2 {
  font-size: 2rem;
  margin-bottom: 32px;
}

.tech-list {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 12px;
}

.tech-item {
  padding: 8px 16px;
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  font-weight: 500;
  font-size: 0.9rem;
}

/* Footer */
.footer {
  padding: 40px 0;
  border-top: 1px solid var(--color-border);
  text-align: center;
}

.footer p {
  color: var(--color-text-secondary);
  margin-bottom: 8px;
}

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

.footer a:hover {
  text-decoration: underline;
}

.footer-links {
  font-size: 0.9rem;
}

/* Responsive */
@media (max-width: 768px) {
  .hero h2 {
    font-size: 2rem;
  }

  .hero-desc {
    font-size: 1rem;
  }

  .nav {
    display: none;
  }

  .feature-grid {
    grid-template-columns: 1fr;
  }

  .ai-tools {
    flex-direction: column;
    align-items: center;
  }

  .ai-tool {
    width: 100%;
    max-width: 300px;
  }
}