:root {
  color-scheme: light;
  --bg: #fff8f0;
  --card: #ffffff;
  --ink: #3d3328;
  --muted: #8a7a6a;
  --accent: #e07a3d;
  --line: #eadfce;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP", Meiryo, sans-serif;
  background: linear-gradient(180deg, #fff8f0 0%, #f3e7d7 100%);
  color: var(--ink);
  line-height: 1.75;
}

main {
  max-width: 720px;
  margin: 0 auto;
  padding: 32px 20px 64px;
}

header {
  margin-bottom: 28px;
}

.brand {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--accent);
  margin: 0 0 8px;
}

h1 {
  margin: 0 0 8px;
  font-size: 28px;
  line-height: 1.3;
}

.meta {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

nav {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 20px 0 0;
}

nav a {
  color: var(--accent);
  font-weight: 600;
  text-decoration: none;
}

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

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 24px;
}

h2 {
  margin: 28px 0 10px;
  font-size: 18px;
}

h3 {
  margin: 18px 0 8px;
  font-size: 16px;
}

.card > h2:first-child {
  margin-top: 0;
}

p,
li {
  font-size: 15px;
}

ul {
  padding-left: 1.25em;
}

footer {
  margin-top: 28px;
  color: var(--muted);
  font-size: 13px;
}

.note {
  background: #fff3e6;
  border-left: 4px solid var(--accent);
  padding: 12px 14px;
  border-radius: 8px;
  margin: 16px 0;
}

@media (max-width: 480px) {
  h1 {
    font-size: 24px;
  }

  .card {
    padding: 18px;
  }
}