:root {
  --color-paper: #f6f1e7;
  --color-paper-deep: #e8e1d2;
  --color-ink: #193a30;
  --color-seal: #ad533b;
  --color-white: #fffdf8;
  --color-line: rgba(25, 58, 48, .14);
  --font-serif: "Songti SC", "STSong", "Noto Serif SC", Georgia, serif;
  --font-sans: Inter, "PingFang SC", "Microsoft YaHei", sans-serif;
  --content-width: 72rem;
  --section-space: clamp(4.5rem, 9vw, 8rem);
  --shadow-soft: 0 1.25rem 3rem rgba(43, 37, 25, .09);
}