:root {
  --color-bg: #ffffff;
  --color-bg-alt: #f6f8fa;
  --color-text: #1f2933;
  --color-text-muted: #5c6773;
  --color-heading: #0d1117;
  --color-accent: #2563eb;
  --color-accent-dark: #1d4ed8;
  --color-border: #dde3ea;
  --color-code-bg: #f0f3f6;
  --color-pill-bg: #eef2ff;
  --color-pill-text: #4338ca;
  --radius: 8px;
  --shadow-sm: 0 1px 2px rgba(16, 24, 40, 0.06);
  --shadow-md: 0 4px 12px rgba(16, 24, 40, 0.08);
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  --font-mono: "SF Mono", SFMono-Regular, ui-monospace, Menlo, Consolas, monospace;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
}

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

a:hover {
  text-decoration: underline;
}

.container {
  max-width: 980px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- Header ---------- */

.site-header {
  border-bottom: 1px solid var(--color-border);
  background: var(--color-bg);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  gap: 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 18px;
  color: var(--color-heading);
}

.brand:hover {
  text-decoration: none;
}

.brand .logo {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 7px;
  background: linear-gradient(135deg, #2563eb, #4f46e5);
  color: #fff;
  font-size: 14px;
  flex-shrink: 0;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 20px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  color: var(--color-text-muted);
  font-weight: 500;
  font-size: 15px;
}

.nav-links a:hover {
  color: var(--color-accent);
  text-decoration: none;
}

.nav-links a.active {
  color: var(--color-heading);
}

.nav-links a.cta {
  color: #fff;
  background: var(--color-accent);
  padding: 7px 14px;
  border-radius: var(--radius);
  font-size: 14px;
}

.nav-links a.cta:hover {
  background: var(--color-accent-dark);
  text-decoration: none;
}

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 6px 10px;
  font-size: 18px;
  cursor: pointer;
  color: var(--color-heading);
}

/* ---------- Hero ---------- */

.hero {
  padding: 72px 0 64px;
  background:
    radial-gradient(1000px 500px at 80% -10%, rgba(37, 99, 235, 0.08), transparent 60%),
    var(--color-bg);
}

.hero .container {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 48px;
  align-items: center;
}

.pill {
  display: inline-block;
  background: var(--color-pill-bg);
  color: var(--color-pill-text);
  font-size: 13px;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: 999px;
  letter-spacing: 0.02em;
}

.hero h1 {
  font-size: 42px;
  line-height: 1.15;
  margin: 16px 0 12px;
  color: var(--color-heading);
  letter-spacing: -0.02em;
}

.hero p.lede {
  font-size: 18px;
  color: var(--color-text-muted);
  margin: 0 0 28px;
  max-width: 56ch;
}

.hero-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.btn {
  display: inline-block;
  font-weight: 600;
  font-size: 15px;
  padding: 10px 20px;
  border-radius: var(--radius);
  transition: background 0.15s ease, border-color 0.15s ease;
}

.btn-primary {
  background: var(--color-accent);
  color: #fff;
}

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

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

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

.terminal {
  background: #0d1117;
  border-radius: 12px;
  box-shadow: var(--shadow-md);
  overflow: hidden;
}

.terminal-bar {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 10px 14px;
  background: #161b22;
  border-bottom: 1px solid #21262d;
}

.terminal-bar span {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  display: inline-block;
}

.terminal-bar .red { background: #ff5f57; }
.terminal-bar .yellow { background: #febc2e; }
.terminal-bar .green { background: #28c840; }

.terminal-body {
  padding: 16px;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.7;
  color: #c9d1d9;
  overflow-x: auto;
}

.terminal-body .prompt { color: #58a6ff; }
.terminal-body .ok { color: #3fb950; }
.terminal-body .muted { color: #8b949e; }

/* ---------- Sections ---------- */

.section {
  padding: 64px 0;
  border-bottom: 1px solid var(--color-border);
}

.section.alt {
  background: var(--color-bg-alt);
}

.section h2 {
  font-size: 28px;
  color: var(--color-heading);
  margin: 0 0 8px;
  letter-spacing: -0.01em;
}

.section .subtitle {
  color: var(--color-text-muted);
  margin: 0 0 32px;
  font-size: 16px;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
}

.feature-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 24px;
  box-shadow: var(--shadow-sm);
}

.feature-card .icon {
  font-size: 24px;
  margin-bottom: 8px;
}

.feature-card h3 {
  font-size: 17px;
  margin: 0 0 6px;
  color: var(--color-heading);
}

.feature-card p {
  font-size: 14px;
  color: var(--color-text-muted);
  margin: 0;
}

.feature-card code {
  font-family: var(--font-mono);
  font-size: 13px;
  background: var(--color-code-bg);
  padding: 1px 5px;
  border-radius: 4px;
  color: var(--color-heading);
}

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

pre.code-block {
  background: var(--color-code-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 16px;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.6;
  margin: 0;
}

code {
  font-family: var(--font-mono);
}

p code, li code {
  background: var(--color-code-bg);
  padding: 1px 5px;
  border-radius: 4px;
  font-size: 0.9em;
  color: var(--color-heading);
}

/* ---------- Callout ---------- */

.callout {
  border-left: 4px solid var(--color-accent);
  background: var(--color-bg-alt);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 16px 20px;
  font-size: 14px;
  margin: 20px 0;
}

.callout strong {
  color: var(--color-heading);
}

/* ---------- Footer ---------- */

.site-footer {
  background: #0d1117;
  color: #8b949e;
  padding: 48px 0 32px;
  font-size: 14px;
}

.footer-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 40px;
  justify-content: space-between;
  margin-bottom: 32px;
}

.footer-col h4 {
  color: #e6edf3;
  font-size: 14px;
  margin: 0 0 10px;
}

.footer-col ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.footer-col li {
  margin-bottom: 6px;
}

.footer-col a {
  color: #8b949e;
}

.footer-col a:hover {
  color: #e6edf3;
  text-decoration: none;
}

.footer-bottom {
  border-top: 1px solid #21262d;
  padding-top: 20px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: space-between;
  align-items: center;
}

.footer-bottom a {
  color: #8b949e;
}

.footer-bottom a:hover {
  color: #e6edf3;
  text-decoration: none;
}

.parent-link {
  font-weight: 600;
  color: #c9d1d9;
}

/* ---------- Page content ---------- */

.page-header {
  padding: 48px 0 8px;
}

.page-header h1 {
  font-size: 34px;
  margin: 12px 0 4px;
  color: var(--color-heading);
}

.page-header .subtitle {
  color: var(--color-text-muted);
  font-size: 17px;
}

.prose {
  padding: 32px 0 64px;
}

.prose h2 {
  font-size: 24px;
  color: var(--color-heading);
  margin: 40px 0 12px;
}

.prose h3 {
  font-size: 19px;
  color: var(--color-heading);
  margin: 28px 0 8px;
}

.prose p, .prose li {
  color: var(--color-text);
}

.prose ul {
  padding-left: 22px;
}

.prose table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0;
  font-size: 14px;
}

.prose th, .prose td {
  border: 1px solid var(--color-border);
  padding: 10px 12px;
  text-align: left;
}

.prose th {
  background: var(--color-bg-alt);
  color: var(--color-heading);
  font-weight: 600;
}

.prose blockquote {
  margin: 20px 0;
  padding: 12px 20px;
  border-left: 4px solid var(--color-border);
  color: var(--color-text-muted);
  background: var(--color-bg-alt);
}

/* ---------- Changelog ---------- */

.changelog-entry {
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 20px 24px;
  margin-bottom: 20px;
  box-shadow: var(--shadow-sm);
}

.changelog-entry h2 {
  margin: 0 0 12px;
  font-size: 20px;
}

.changelog-entry ul {
  margin: 0;
  padding-left: 22px;
}

/* ---------- Responsive ---------- */

@media (max-width: 768px) {
  .hero {
    padding: 48px 0 40px;
  }

  .hero .container {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .hero h1 {
    font-size: 32px;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    align-items: flex-start;
    padding: 16px 24px;
    gap: 14px;
    box-shadow: var(--shadow-md);
  }

  .nav-links.open {
    display: flex;
  }

  .nav-toggle {
    display: block;
  }

  .section {
    padding: 48px 0;
  }
}