:root {
  /* Cool editorial palette — porcelain / ink / indigo */
  --zk-ivory: #F8F8F6;
  --zk-soft: #EEF0F3;
  --zk-paper: #FFFFFF;
  --zk-charcoal: #0E1525;
  --zk-ink: #0E1525;
  --zk-warm: #5A6578;
  --zk-mist: #A8B0BE;
  --zk-line: rgba(14, 21, 37, 0.12);
  --zk-accent: #2A3F6A;
  --zk-accent-deep: #1B2A4A;
  --zk-accent-soft: rgba(42, 63, 106, 0.12);
  --zk-gold: #C4A574;
  --zk-overlay: rgba(14, 21, 37, 0.42);
  --zk-overlay-strong: rgba(14, 21, 37, 0.58);
  --zk-white: #ffffff;

  /* Typography */
  --zk-font-display: "Shippori Mincho", "Hiragino Mincho ProN", "Yu Mincho", serif;
  --zk-font-body: "Noto Sans JP", "Hiragino Sans", "Yu Gothic", sans-serif;
  --zk-font-latin: "Cormorant Garamond", Georgia, serif;

  --zk-fs-xs: clamp(0.7rem, 0.65rem + 0.2vw, 0.78rem);
  --zk-fs-sm: clamp(0.82rem, 0.78rem + 0.2vw, 0.92rem);
  --zk-fs-base: clamp(0.95rem, 0.9rem + 0.25vw, 1.05rem);
  --zk-fs-md: clamp(1.05rem, 1rem + 0.35vw, 1.25rem);
  --zk-fs-lg: clamp(1.4rem, 1.15rem + 1.1vw, 2.1rem);
  --zk-fs-xl: clamp(1.9rem, 1.4rem + 2vw, 3.4rem);
  --zk-fs-hero: clamp(2.1rem, 1.4rem + 3.2vw, 4.4rem);

  --zk-lh-tight: 1.2;
  --zk-lh-base: 1.75;
  --zk-lh-loose: 2;

  --zk-tracking-wide: 0.22em;
  --zk-tracking-label: 0.28em;

  /* Spacing */
  --zk-space-1: 0.25rem;
  --zk-space-2: 0.5rem;
  --zk-space-3: 0.75rem;
  --zk-space-4: 1rem;
  --zk-space-5: 1.5rem;
  --zk-space-6: 2rem;
  --zk-space-7: 3rem;
  --zk-space-8: 4.5rem;
  --zk-space-9: 6.5rem;
  --zk-space-10: 8.5rem;

  /* Layout */
  --zk-container: 1400px;
  --zk-container-wide: 1520px;
  --zk-gutter: clamp(1rem, 3vw, 1.5rem);
  --zk-section-y: clamp(3.5rem, 7vw, 6rem);
  --zk-nav-h: 84px;
  --zk-nav-h-compact: 68px;
  --zk-radius-sm: 2px;
  --zk-radius: 4px;

  /* Motion */
  --zk-ease: cubic-bezier(0.22, 1, 0.36, 1);
  --zk-ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --zk-duration: 0.45s;
  --zk-duration-fast: 0.25s;
  --zk-duration-slow: 0.8s;

  /* Shadows */
  --zk-shadow-soft: 0 18px 50px rgba(14, 21, 37, 0.08);
}

@media (prefers-reduced-motion: reduce) {
  :root {
    --zk-duration: 0.01ms;
    --zk-duration-fast: 0.01ms;
    --zk-duration-slow: 0.01ms;
  }
}