:root {
  /* 色 — 墨 × 和紙 × 鎏金 */
  --ink: #0d0b09;
  --ink-soft: #15120e;
  --ink-raise: #1d1914;
  --washi: #f5f1ea;
  --washi-deep: #ebe5da;
  --gold: #c9a86a;
  --gold-soft: #e3cfa4;
  --copper: #a8714e;
  --text-on-ink: #ece5d8;
  --text-on-ink-dim: rgba(236, 229, 216, 0.56);
  --text-on-washi: #1c1813;
  --text-on-washi-dim: rgba(28, 24, 19, 0.62);
  --line-on-ink: rgba(236, 229, 216, 0.14);
  --line-on-washi: rgba(28, 24, 19, 0.14);

  /* タイポグラフィ */
  --font-heading: "Shippori Mincho B1", "Hiragino Mincho ProN", serif;
  --font-body: "Zen Kaku Gothic New", "Hiragino Kaku Gothic ProN", sans-serif;
  --font-latin: "Cormorant Garamond", Georgia, serif;

  --text-base: clamp(0.9375rem, 0.89rem + 0.25vw, 1.0625rem);
  --text-sm: 0.8125rem;
  --text-xs: 0.6875rem;
  --text-lg: clamp(1.125rem, 1rem + 0.6vw, 1.5rem);
  --text-h2: clamp(1.75rem, 1.1rem + 3.2vw, 3.5rem);
  --text-hero: clamp(2.6rem, 1rem + 8vw, 7.5rem);
  --text-watermark: clamp(5rem, 18vw, 16rem);

  /* 余白リズム */
  --space-section: clamp(5rem, 4rem + 8vw, 12rem);
  --space-gutter: clamp(1.25rem, 0.5rem + 4vw, 5rem);

  /* モーション */
  --duration-fast: 180ms;
  --duration-normal: 320ms;
  --duration-slow: 700ms;
  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out-soft: cubic-bezier(0.65, 0, 0.35, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);

  /* レイヤー */
  --z-base: 0;
  --z-raise: 10;
  --z-header: 100;
  --z-menu: 200;
  --z-cursor: 900;
  --z-loader: 1000;
}