:root {
  --bg: #0d1117;
  --card: #161b22;
  --text: #e6edf3;
  --accent: #58a6ff;
  --code-bg: #010409;
  --border: #30363d;
  --success: #3fb950;
}
body {
  font-family:
    -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  background-color: var(--bg);
  color: var(--text);
  margin: 0;
  line-height: 1.6;
}

/* Modern Navigation */
nav {
  position: fixed;
  top: 0;
  width: 100%;
  background: rgba(13, 17, 23, 0.8);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  z-index: 1000;
}
.nav-content {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 15px 20px;
}
.logo {
  font-weight: 800;
  font-size: 1.4rem;
  color: var(--accent);
  text-decoration: none;
}
.nav-links a {
  color: var(--text);
  text-decoration: none;
  margin-left: 30px;
  font-size: 0.95rem;
  opacity: 0.8;
  transition: 0.2s;
}
.nav-links a:hover {
  opacity: 1;
  color: var(--accent);
}

/* Hero Section */
.hero {
  padding: 160px 20px 100px 20px;
  text-align: center;
  background: radial-gradient(circle at top, #161b22 0%, #0d1117 100%);
}
h1 {
  font-size: 4.5rem;
  margin: 0;
  letter-spacing: -2px;
}
.tagline {
  font-size: 1.5rem;
  opacity: 0.7;
  margin: 20px 0;
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}

/* CTA Buttons */
.cta-group {
  margin-top: 40px;
}
.btn {
  padding: 14px 32px;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 600;
  display: inline-block;
  transition: 0.2s;
}
.btn-primary {
  background: var(--accent);
  color: #0d1117;
  margin-right: 15px;
}
.btn-secondary {
  border: 1px solid var(--border);
  color: var(--text);
}
.btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.3);
}

/* Feature Grid */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 80px 20px;
}
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
}
.card {
  background: var(--card);
  padding: 40px;
  border-radius: 16px;
  border: 1px solid var(--border);
  transition: 0.3s;
}
.card:hover {
  border-color: var(--accent);
}
.card h3 {
  margin-top: 0;
  font-size: 1.5rem;
}

/* Code Sample */
.code-box {
  background: var(--code-bg);
  border-radius: 12px;
  padding: 30px;
  border: 1px solid var(--border);
  margin-top: 60px;
  text-align: left;
  position: relative;
}
.code-header {
  position: absolute;
  top: 12px;
  left: 20px;
  display: flex;
  gap: 8px;
}
.dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}
pre {
  font-family: "Fira Code", monospace;
  margin: 20px 0 0 0;
  color: #d1d5db;
}
.keyword {
  color: #ff9a72;
}
.func {
  color: #d2a8ff;
}
.string {
  color: #e9cc6f;
}
.comment {
  color: #8b949e; /* GitHub's comment gray */
}

/* Docs Layout */
.docs-layout {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 60px;
}
.sidebar h4 {
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  opacity: 0.5;
  margin-top: 30px;
  margin-bottom: 15px;
}
.sidebar a {
  display: block;
  color: var(--text);
  text-decoration: none;
  padding: 8px 0;
  opacity: 0.8;
  transition: 0.2s;
}
.sidebar a:hover {
  opacity: 1;
  color: var(--accent);
}
.sidebar a.active {
  color: var(--accent);
  font-weight: 600;
  opacity: 1;
}
.sidebar hr {
  border: 0;
  border-top: 1px solid var(--border);
  margin: 20px 0;
}
.docs-content h2 {
  font-size: 2.5rem;
  border-bottom: 1px solid var(--border);
  padding-bottom: 15px;
  margin-top: 0;
}
.docs-content h3 {
  font-size: 1.8rem;
  margin-top: 40px;
}

footer {
  text-align: center;
  padding: 60px;
  border-top: 1px solid var(--border);
  opacity: 0.5;
}