:root {
  --ink: #172031;
  --ink-soft: #45536c;
  --sand: #fcf8ef;
  --panel: rgba(255, 255, 255, 0.9);
  --line: #d9d4c9;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  font-family: "Zen Kaku Gothic New", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at 85% 12%, rgba(157, 217, 201, 0.45), transparent 38%),
    radial-gradient(circle at 12% 90%, rgba(236, 155, 98, 0.25), transparent 36%),
    linear-gradient(135deg, #fffdf8, #f6efde 55%, #fefaf1);
  padding: 24px 12px;
}

.page {
  max-width: 860px;
  margin: 0 auto;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 20px;
}

h1 {
  margin: 0 0 12px;
}

h2 {
  margin: 22px 0 8px;
  font-size: 1.1rem;
}

p,
li {
  line-height: 1.6;
  color: var(--ink-soft);
}

a {
  color: var(--ink);
}

.top-nav {
  margin-bottom: 14px;
}

.top-nav a {
  text-decoration: none;
}

.top-nav a:hover {
  text-decoration: underline;
}