:root {
  --bg: #0d1117;
  --bg-secondary: #161b22;
  --text: #c9d1d9;
  --text-secondary: #8b949e;
  --accent: #58a6ff;
  --green: #3fb950;
  --border: #21262d;
}

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

html {
  scroll-behavior: smooth;
}

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

.container {
  max-width: 1000px;
  margin: 0 auto;
  padding: 0 24px;
}

/* --- Hero --- */

.hero {
  text-align: center;
  padding: 120px 0 80px;
}

.hero-title {
  font-family: 'SF Mono', 'Cascadia Code', 'Fira Code', 'Consolas', monospace;
  font-size: 4rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.1em;
}

.hero-tagline {
  color: var(--text-secondary);
  font-size: 1.25rem;
  margin-top: 16px;
  font-family: 'SF Mono', 'Cascadia Code', 'Fira Code', 'Consolas', monospace;
}

.hero-buttons {
  margin-top: 32px;
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  display: inline-block;
  padding: 12px 28px;
  border-radius: 6px;
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
  transition: opacity 0.2s;
}

.btn:hover {
  opacity: 0.85;
}

.btn-primary {
  background: var(--green);
  color: #ffffff;
}

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

/* --- Sections --- */

section {
  padding: 80px 0;
  border-top: 1px solid var(--border);
}

.section-title {
  font-size: 1.75rem;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 16px;
}

.section-desc {
  color: var(--text-secondary);
  margin-bottom: 40px;
  max-width: 700px;
}

#architecture .section-desc {
  max-width: 100%;
}

.section-desc a {
  color: var(--accent);
  text-decoration: none;
}

.section-desc a:hover {
  text-decoration: underline;
}

/* --- Architecture pipeline --- */

.pipeline-label {
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 12px;
  margin-top: 24px;
  font-family: 'SF Mono', 'Cascadia Code', 'Fira Code', 'Consolas', monospace;
}

.pipeline {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
  flex-wrap: wrap;
  margin-bottom: 40px;
}

.pipeline-step {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px 24px;
  font-family: 'SF Mono', 'Cascadia Code', 'Fira Code', 'Consolas', monospace;
  font-size: 0.9rem;
  text-align: center;
  color: var(--text);
}

.pipeline-arrow {
  color: var(--accent);
  font-size: 1.5rem;
  padding: 0 12px;
}

.arch-details {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-top: 24px;
}

.arch-detail {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 24px;
}

.arch-detail h3 {
  color: var(--accent);
  font-size: 1.1rem;
  margin-bottom: 8px;
}

.arch-detail p {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.arch-detail .tag {
  display: inline-block;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 2px 8px;
  font-size: 0.8rem;
  color: var(--green);
  font-family: monospace;
  margin-top: 8px;
}

/* --- Features grid --- */

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

.feature-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 24px;
}

.feature-card h3 {
  color: var(--accent);
  font-size: 1.1rem;
  margin-bottom: 8px;
}

.feature-card p {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* --- Terminal block --- */

.terminal {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 24px;
  font-family: 'SF Mono', 'Cascadia Code', 'Fira Code', 'Consolas', monospace;
  font-size: 0.85rem;
  line-height: 1.8;
  overflow-x: auto;
}

.terminal .prompt {
  color: var(--green);
}

.terminal .command {
  color: var(--text);
}

.terminal .output {
  color: var(--text-secondary);
}

.terminal .success {
  color: var(--green);
}

.terminal .comment {
  color: var(--text-secondary);
  font-style: italic;
}

/* --- Samples grid --- */

.samples-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.sample-item {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 10px 14px;
  font-family: monospace;
  font-size: 0.85rem;
  color: var(--text);
}

/* --- Code blocks --- */

pre {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 24px;
  overflow-x: auto;
  font-size: 0.85rem;
  line-height: 1.8;
}

code {
  font-family: 'SF Mono', 'Cascadia Code', 'Fira Code', 'Consolas', monospace;
  color: var(--text);
}

/* --- Footer --- */

.footer {
  border-top: 1px solid var(--border);
  padding: 40px 0;
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.85rem;
}

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

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

.footer p {
  margin-top: 8px;
}

/* --- Responsive --- */

@media (max-width: 768px) {
  .hero-title {
    font-size: 2.5rem;
  }

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

  .hero {
    padding: 80px 0 60px;
  }

  section {
    padding: 60px 0;
  }

  .features-grid,
  .arch-details {
    grid-template-columns: 1fr;
  }

  .pipeline {
    flex-direction: column;
    gap: 8px;
  }

  .pipeline-arrow {
    transform: rotate(90deg);
    padding: 4px 0;
  }
}