:root {
  /* Brand — medium gray bands + amber accent */
  --color-bg-shell: #404040;
  --color-bg: #888888;
  --color-bg-alt: #4d4d4d;
  --color-bg-elevated: #959595;
  --color-bg-elevated-dark: #575757;
  --color-bg-input: #f2f2f2;
  --color-bg-input-dark: #5a5a5a;
  --color-border: #7a7a7a;
  --color-border-strong: #666666;
  --color-border-dark: #666666;
  --color-border-strong-dark: #777777;
  --color-text: #1a1a1a;
  --color-text-muted: #3a3a3a;
  --color-text-subtle: #2a2a2a;
  --color-heading: #0d0d0d;
  --color-text-on-dark: #ececec;
  --color-text-muted-on-dark: #cccccc;
  --color-text-subtle-on-dark: #d8d8d8;
  --color-heading-on-dark: #f5f5f5;
  --color-accent: #ffbf00;
  --color-accent-hover: #e6ac00;
  --color-accent-muted: rgba(255, 191, 0, 0.22);
  --color-accent-dark: #8a6900;
  --color-accent-dark-on-dark: #ffbf00;
  --color-on-accent: #141414;
  --color-success: #1e7e34;
  --color-error: #b3261e;
  --color-white: #ffffff;

  /* Typography — Space Grotesk everywhere */
  --font-sans: "Space Grotesk", system-ui, sans-serif;
  --font-mono: "Space Grotesk", system-ui, sans-serif;

  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 2rem;
  --text-4xl: 2.5rem;
  --text-5xl: 3rem;

  --leading-tight: 1.2;
  --leading-normal: 1.5;
  --leading-relaxed: 1.65;

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  /* Layout */
  --container-max: 72rem;
  --container-narrow: 48rem;
  --header-height: 4rem;
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 10px;
  --radius-xl: 16px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.12);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.16);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.2);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;

  /* Breakpoints (for reference in media queries) */
  --bp-sm: 640px;
  --bp-md: 768px;
  --bp-lg: 1024px;
  --bp-xl: 1280px;
}