:root {
  --bg: #0a0e14;
  --bg-elevated: #111820;
  --surface: #161d27;
  --surface-hover: #1c2530;
  --border: #262f3d;
  --border-subtle: #1e2633;
  --fg: #e2e8f0;
  --fg-muted: #8899aa;
  --fg-dim: #5c6b7a;
  --accent: #818cf8;
  --accent-hover: #a5b4fc;
  --accent-dim: rgba(129, 140, 248, 0.12);
  --code-bg: #0f1419;
  --code-border: #1e2633;
  --success: #34d399;
  --warning: #fbbf24;
  --radius: 8px;
  --radius-lg: 12px;
  --shadow: 0 1px 3px rgba(0,0,0,0.3), 0 1px 2px rgba(0,0,0,0.2);
  --shadow-lg: 0 4px 12px rgba(0,0,0,0.4);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

/* Header */
header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 14, 20, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-subtle);
}

.header-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 1.25rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
}

.brand { display: flex; flex-direction: column; gap: 0.25rem; }

.logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
  color: var(--fg);
}

.logo-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  background: linear-gradient(135deg, var(--accent), #6366f1);
  border-radius: 6px;
  font-weight: 700;
  font-size: 14px;
  color: white;
}

.logo-text {
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.tagline {
  font-size: 0.78rem;
  color: var(--fg-dim);
  display: none;
}

nav {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  flex-wrap: wrap;
}

nav a {
  color: var(--fg-muted);
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 500;
  padding: 0.4rem 0.75rem;
  border-radius: var(--radius);
  transition: color 0.15s, background 0.15s;
}

nav a:hover {
  color: var(--fg);
  background: var(--surface);
}

nav a.active {
  color: var(--accent);
  background: var(--accent-dim);
}

nav .github-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  margin-left: 0.5rem;
  padding: 0.4rem 0.85rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

nav .github-link:hover {
  border-color: var(--fg-muted);
  background: var(--surface);
}

/* Main */
main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 3rem 2rem 4rem;
  min-height: calc(100vh - 200px);
}

.content { max-width: 780px; }

/* Typography */
.content h1 {
  font-size: 2.25rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 1.5rem;
  background: linear-gradient(135deg, var(--fg) 0%, var(--fg-muted) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.content h2 {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 2.5rem 0 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-subtle);
  color: var(--fg);
}

.content h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin: 2rem 0 0.75rem;
  color: var(--fg);
}

.content h4 {
  font-size: 1rem;
  font-weight: 600;
  margin: 1.5rem 0 0.5rem;
  color: var(--fg-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-size: 0.8rem;
}

.content p { margin-bottom: 1.25rem; }

.content a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.15s;
}

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

.content strong { color: var(--fg); font-weight: 600; }

/* Code */
.content code {
  background: var(--code-bg);
  border: 1px solid var(--code-border);
  padding: 0.15em 0.4em;
  border-radius: 4px;
  font-size: 0.88em;
  font-family: 'JetBrains Mono', 'Fira Code', 'SF Mono', Menlo, monospace;
}

.content pre {
  background: var(--code-bg);
  border: 1px solid var(--code-border);
  border-radius: var(--radius-lg);
  padding: 1.25rem 1.5rem;
  overflow-x: auto;
  margin: 1.5rem 0;
  box-shadow: var(--shadow);
}

.content pre code {
  background: none;
  border: none;
  padding: 0;
  font-size: 0.85em;
  line-height: 1.8;
}

/* Tables */
.content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border);
}

.content th, .content td {
  padding: 0.7rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--border-subtle);
}

.content th {
  background: var(--surface);
  font-weight: 600;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--fg-muted);
}

.content tr:last-child td { border-bottom: none; }
.content tr:hover td { background: var(--surface-hover); }

/* Lists */
.content ul, .content ol {
  margin: 1rem 0 1.5rem;
  padding-left: 1.5rem;
}

.content li {
  margin-bottom: 0.6rem;
  padding-left: 0.25rem;
}

.content li::marker { color: var(--fg-dim); }

/* Blockquotes */
.content blockquote {
  border-left: 3px solid var(--accent);
  background: var(--accent-dim);
  padding: 1rem 1.25rem;
  border-radius: 0 var(--radius) var(--radius) 0;
  margin: 1.5rem 0;
  color: var(--fg-muted);
}

.content blockquote p:last-child { margin-bottom: 0; }

/* Horizontal rules */
.content hr {
  border: none;
  border-top: 1px solid var(--border-subtle);
  margin: 2.5rem 0;
}

/* Footer */
footer {
  border-top: 1px solid var(--border-subtle);
  padding: 2.5rem 2rem;
  text-align: center;
}

.footer-inner {
  max-width: 1100px;
  margin: 0 auto;
}

footer p {
  color: var(--fg-dim);
  font-size: 0.85rem;
  margin-bottom: 0.5rem;
}

footer .copyright { font-size: 0.8rem; }

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

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

/* Responsive */
@media (max-width: 768px) {
  .header-inner {
    flex-direction: column;
    align-items: flex-start;
    padding: 1rem 1.25rem;
  }

  nav { gap: 0.15rem; }
  nav a { padding: 0.35rem 0.6rem; font-size: 0.8rem; }
  nav .github-link { margin-left: 0; }

  main { padding: 2rem 1.25rem; }

  .content h1 { font-size: 1.75rem; }
  .content h2 { font-size: 1.3rem; }

  .content pre { padding: 1rem; border-radius: var(--radius); }
}

@media (min-width: 1024px) {
  .tagline { display: block; }
}