:root {
  --bg: #f6f7fb;
  --card: #ffffff;
  --text: #172033;
  --muted: #687086;
  --border: #e5e8f0;
  --accent: #3157d5;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
}

header {
  background: #111827;
  color: white;
  padding: 28px 0;
}

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

nav {
  margin-top: 16px;
}

nav a {
  color: #dbeafe;
  text-decoration: none;
  margin-right: 18px;
  font-size: 15px;
}

main {
  padding: 36px 0;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 24px;
  margin-bottom: 20px;
  box-shadow: 0 10px 30px rgba(15, 23, 42, .04);
}

h1, h2 {
  margin-top: 0;
}

p {
  color: var(--muted);
  line-height: 1.6;
}

table {
  width: 100%;
  border-collapse: collapse;
}

td, th {
  border-bottom: 1px solid var(--border);
  padding: 12px 8px;
  text-align: left;
}

a.button {
  display: inline-block;
  background: var(--accent);
  color: white;
  padding: 10px 14px;
  border-radius: 10px;
  text-decoration: none;
}

code {
  background: #eef2ff;
  padding: 2px 6px;
  border-radius: 6px;
}