@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=Space+Grotesk:wght@500;600&display=swap');

:root {
  --bg: #0f172a;
  --panel: #0b1220;
  --surface: #111a2e;
  --text: #e7edf7;
  --muted: #96a3ba;
  --primary: #5ac8fa;
  --primary-strong: #3ea9e3;
  --border: #1f2a40;
  --code-bg: #0d2538;
  --shadow: 0 15px 50px rgba(0,0,0,0.35);
  --radius: 14px;
}

* {
  box-sizing: border-box;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.7;
  margin: 0;
  padding: 0;
  color: var(--text);
  background: radial-gradient(circle at 20% 20%, rgba(90,200,250,0.12), transparent 25%),
              radial-gradient(circle at 80% 0%, rgba(255,166,77,0.10), transparent 22%),
              var(--bg);
}

/* page frame */
.container {
  max-width: 980px;
  margin: 32px auto 80px;
  padding: 28px 28px 48px;
  background: linear-gradient(145deg, #0f1b32 0%, #0c1527 100%);
  border: 1px solid var(--border);
  border-radius: 18px;
  box-shadow: var(--shadow);
}

nav {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  margin-bottom: 28px;
}

nav a {
  color: var(--text);
  text-decoration: none;
  padding: 10px 14px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 15px;
  border: 1px solid transparent;
  transition: all 0.2s ease;
  background: rgba(255,255,255,0.02);
}

nav a:hover {
  border-color: rgba(90,200,250,0.6);
  color: var(--primary);
  transform: translateY(-1px);
}

h1, h2, h3 {
  color: var(--text);
  letter-spacing: -0.01em;
}

h1 {
  font-family: 'Space Grotesk', 'Inter', sans-serif;
  font-size: 42px;
  margin-top: 0;
  margin-bottom: 12px;
}

h2 {
  font-size: 28px;
  margin-top: 32px;
  margin-bottom: 10px;
}

h3 {
  font-size: 22px;
  margin-bottom: 8px;
}

p, li {
  font-size: 17px;
  color: var(--muted);
}

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

a:hover {
  text-decoration: underline;
}

code {
  background-color: var(--code-bg);
  color: #c8e7ff;
  padding: 2px 6px;
  border-radius: 6px;
  font-size: 14px;
}

pre {
  background-color: var(--code-bg);
  padding: 16px;
  border-radius: 12px;
  overflow-x: auto;
  border: 1px solid var(--border);
}

blockquote {
  border-left: 4px solid var(--primary);
  padding-left: 16px;
  margin-left: 0;
  color: var(--muted);
}

table {
  border-collapse: collapse;
  width: 100%;
  border: 1px solid var(--border);
}

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

tr:nth-child(even) {
  background-color: #101a2d;
}

.cta {
  display: inline-block;
  background: linear-gradient(135deg, var(--primary), var(--primary-strong));
  color: #0b1220;
  padding: 12px 18px;
  border-radius: 12px;
  font-weight: 700;
  text-decoration: none;
  box-shadow: 0 12px 30px rgba(90,200,250,0.35);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 16px 36px rgba(90,200,250,0.45);
}

@media (max-width: 768px) {
  .container {
    margin: 18px 14px 48px;
    padding: 22px 18px 36px;
  }
  nav {
    gap: 8px;
  }
  h1 { font-size: 34px; }
  h2 { font-size: 24px; }
  h3 { font-size: 20px; }
}