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

:root {
  --bg: #0d1117;
  --bg-card: #161b22;
  --bg-code: #1c2128;
  --border: #30363d;
  --text: #e6edf3;
  --text-muted: #8b949e;
  --accent: #58a6ff;
  --accent-hover: #79c0ff;
  --green: #3fb950;
  --orange: #d29922;
  --mono: "SF Mono", "Cascadia Code", "Fira Code", Consolas, "Liberation Mono", Menlo, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
}

html {
  scroll-behavior: smooth;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

a:hover {
  color: var(--accent-hover);
  text-decoration: underline;
}

/* Layout */
.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

section {
  padding: 4rem 0;
  border-bottom: 1px solid var(--border);
}

section:last-of-type {
  border-bottom: none;
}

h2 {
  font-family: var(--mono);
  font-size: 1.5rem;
  margin-bottom: 1.5rem;
  color: var(--accent);
  font-weight: 600;
}

h2::before {
  content: "# ";
  color: var(--text-muted);
}

/* Hero */
.hero {
  padding: 6rem 0 4rem;
  text-align: center;
}

.hero-logo {
  margin-bottom: 1.5rem;
}

.hero-logo svg {
  max-width: 100%;
  height: auto;
}

.hero h1 {
  font-family: var(--mono);
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 0.75rem;
}

.hero .subtitle {
  font-size: 1.15rem;
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto 2rem;
}

.hero-buttons {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.65rem 1.5rem;
  border-radius: 6px;
  font-family: var(--mono);
  font-size: 0.9rem;
  font-weight: 500;
  transition: background 0.15s, border-color 0.15s;
}

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

.btn-primary:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
  text-decoration: none;
  color: var(--bg);
}

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

.btn-secondary:hover {
  border-color: var(--text-muted);
  text-decoration: none;
}

/* Architecture pipeline */
.pipeline {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  margin-top: 1rem;
}

.pipeline-step {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.25rem;
  position: relative;
}

.pipeline-step h3 {
  font-family: var(--mono);
  font-size: 0.95rem;
  margin-bottom: 0.5rem;
  color: var(--green);
}

.pipeline-step p {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.5;
}

.pipeline-step .step-num {
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 0.4rem;
}

/* Arrow between steps (hidden on mobile) */
.pipeline-step:not(:last-child)::after {
  content: "\2192";
  position: absolute;
  right: -0.85rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-size: 1.1rem;
  z-index: 1;
}

/* Data sources grid */
.sources-group h3 {
  font-family: var(--mono);
  font-size: 1rem;
  color: var(--orange);
  margin-bottom: 0.75rem;
  margin-top: 1.5rem;
}

.sources-group:first-of-type h3 {
  margin-top: 0;
}

.sources-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 0.75rem;
}

.source-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.85rem 1rem;
  font-family: var(--mono);
  font-size: 0.85rem;
}

.source-card .source-name {
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.source-card .source-desc {
  font-family: var(--sans);
  color: var(--text-muted);
  font-size: 0.8rem;
}

/* Quickstart */
.code-block {
  background: var(--bg-code);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.25rem 1.5rem;
  overflow-x: auto;
}

.code-block pre {
  font-family: var(--mono);
  font-size: 0.85rem;
  line-height: 1.7;
  color: var(--text);
}

.code-block .comment {
  color: var(--text-muted);
}

.code-block .cmd {
  color: var(--green);
}

/* Footer */
footer {
  padding: 2rem 0;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.85rem;
  border-top: 1px solid var(--border);
}

footer a {
  color: var(--text-muted);
}

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

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

/* Responsive */
@media (max-width: 768px) {
  .pipeline {
    grid-template-columns: 1fr;
  }

  .pipeline-step:not(:last-child)::after {
    content: "\2193";
    right: auto;
    left: 50%;
    top: auto;
    bottom: -0.85rem;
    transform: translateX(-50%);
  }

  .pipeline-step {
    margin-bottom: 0.5rem;
  }

  section {
    padding: 2.5rem 0;
  }

  .hero {
    padding: 3.5rem 0 2.5rem;
  }

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

@media (max-width: 480px) {
  .sources-grid {
    grid-template-columns: 1fr;
  }
}