:root {
  /* Brand — industrial safety orange + charcoal */
  --color-primary: #e87700;
  --color-primary-dark: #c46300;
  --color-primary-light: #ff9a2e;
  --color-ink: #1a1a1a;
  --color-charcoal: #2c2c2c;
  --color-slate: #4a4a4a;
  --color-muted: #6b6b6b;
  --color-border: #e2e2e2;
  --color-surface: #f5f5f3;
  --color-white: #ffffff;
  --color-overlay: rgba(26, 26, 26, 0.62);

  /* Typography */
  --font-display: "Noto Sans TC", "Microsoft JhengHei", sans-serif;
  --font-body: "Noto Sans TC", "Microsoft JhengHei", sans-serif;
  --fs-xs: 0.8125rem;
  --fs-sm: 0.9375rem;
  --fs-base: 1.0625rem;
  --fs-md: 1.25rem;
  --fs-lg: 1.75rem;
  --fs-xl: 2.25rem;
  --fs-2xl: clamp(2.25rem, 4vw, 3.25rem);
  --fs-hero: clamp(2.5rem, 5.5vw, 4rem);
  --lh-tight: 1.2;
  --lh-body: 1.75;
  --fw-regular: 400;
  --fw-medium: 500;
  --fw-bold: 700;
  --fw-black: 900;

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 3rem;
  --space-8: 4.5rem;
  --space-9: 6rem;
  --container: 1120px;
  --container-wide: 1280px;
  --header-h: 4.5rem;

  /* Effects */
  --radius-sm: 4px;
  --radius: 8px;
  --radius-lg: 12px;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
  --shadow: 0 8px 28px rgba(0, 0, 0, 0.12);
  --transition: 0.28s ease;
  --transition-slow: 0.55s cubic-bezier(0.22, 1, 0.36, 1);

  /* Z-index */
  --z-header: 1000;
  --z-menu: 1001;
  --z-overlay: 1100;
  --z-lightbox: 1200;
  --z-top: 1300;
}