:root {
  --paper: #f6f7f9;
  --surface: #ffffff;
  --text: #13161b;
  --muted: #656c75;
  --blue: #134fe8;
  --vermilion: #d52d17;
  --line: rgba(0, 0, 0, 0.08);
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #14161a;
    --surface: #1c1f25;
    --text: #eceef2;
    --muted: #a0a7b2;
    --blue: #7fa0ff;
    --vermilion: #ff7a5e;
    --line: rgba(255, 255, 255, 0.12);
  }
}

* {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  padding: 0 20px 72px;
  background: var(--paper);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Noto Sans JP",
    "Yu Gothic", sans-serif;
  font-size: 16px;
  line-height: 1.9;
  letter-spacing: 0.01em;
}

.wrap {
  max-width: 44rem;
  margin: 0 auto;
}

header.site {
  padding: 44px 0 28px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 36px;
}

.brand {
  display: inline-flex;
  align-items: baseline;
  gap: 10px;
  text-decoration: none;
  color: inherit;
}

.brand .mark {
  font-family: "Hiragino Mincho ProN", "Yu Mincho", "Noto Serif JP", serif;
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--vermilion);
}

.brand .tag {
  font-size: 0.875rem;
  color: var(--muted);
}

h1 {
  font-size: 1.6rem;
  line-height: 1.5;
  margin: 0 0 8px;
  letter-spacing: 0.02em;
}

h2 {
  font-size: 1.075rem;
  margin: 40px 0 12px;
  padding-top: 4px;
  letter-spacing: 0.02em;
}

h3 {
  font-size: 1rem;
  margin: 28px 0 6px;
}

p,
ul,
ol {
  margin: 0 0 16px;
}

ul,
ol {
  padding-left: 1.35em;
}

li {
  margin-bottom: 8px;
}

a {
  color: var(--blue);
  text-underline-offset: 3px;
}

strong {
  font-weight: 600;
}

.updated {
  color: var(--muted);
  font-size: 0.875rem;
  margin-bottom: 32px;
}

.lead {
  font-size: 1.02rem;
}

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 22px 24px;
  margin: 0 0 20px;
}

.card p:last-child,
.card ul:last-child {
  margin-bottom: 0;
}

.contact-mail {
  display: inline-block;
  font-size: 1.075rem;
  font-weight: 600;
  margin: 2px 0 10px;
  word-break: break-all;
}

.note {
  color: var(--muted);
  font-size: 0.9rem;
}

.faq h3 {
  margin-top: 26px;
}

.faq h3:first-of-type {
  margin-top: 0;
}

hr {
  border: 0;
  border-top: 1px solid var(--line);
  margin: 44px 0 28px;
}

footer.site {
  color: var(--muted);
  font-size: 0.875rem;
  padding-top: 8px;
}

footer.site a {
  color: var(--muted);
}