:root {
  --bg: #F7F3EC;
  --surface: #FFFDF9;
  --ink: #3A3631;
  --ink2: #6F6A62;
  --line: #E6DFD3;
  --blue: #5E7FA8;
  --yellow: #F3CF6E;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1C1B19;
    --surface: #262421;
    --ink: #EDE8DF;
    --ink2: #B4ADA2;
    --line: #3A3733;
    --blue: #9DB5D6;
    color-scheme: dark;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Hiragino Maru Gothic ProN", "Hiragino Sans", "Noto Sans JP", -apple-system, BlinkMacSystemFont, sans-serif;
  line-height: 1.85;
  font-size: 16px;
}
main { max-width: 720px; margin: 0 auto; padding: 40px 16px 64px; }
header.brand { display: flex; align-items: center; gap: 12px; margin-bottom: 28px; }
header.brand img { width: 44px; height: 44px; }
header.brand .name { font-size: 20px; letter-spacing: 0.08em; }
h1 { font-size: 26px; font-weight: 600; margin: 0 0 6px; line-height: 1.4; }
.meta { color: var(--ink2); font-size: 14px; margin: 0 0 28px; }
.lang { font-size: 14px; margin: 0 0 32px; }
.lang a { color: var(--blue); }
section {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 20px 22px;
  margin: 0 0 14px;
}
h2 { font-size: 17px; font-weight: 600; margin: 0 0 8px; line-height: 1.5; }
p, li { margin: 0 0 8px; overflow-wrap: anywhere; }
ul { padding-left: 1.3em; margin: 0 0 8px; }
a { color: var(--blue); }
.note { color: var(--ink2); font-size: 14px; }
hr { border: 0; border-top: 1px solid var(--line); margin: 48px 0 40px; }
footer { color: var(--ink2); font-size: 13px; text-align: center; margin-top: 40px; }