:root {
  /* Shibui palette — muted, restrained */
  --color-bg: #faf9f7;
  --color-bg-alt: #f3f1ed;
  --color-surface: #ffffff;
  --color-text: #2d2d2d;
  --color-text-muted: #7a7a7a;
  --color-text-light: #a0a0a0;
  --color-border: #e8e6e1;
  --color-border-light: #f0eee9;
  --color-accent: #5c6b7a;
  --color-accent-faint: rgba(92, 107, 122, 0.04);
  --color-accent-warm: #8b7a6e;
  --color-danger: #9e6b6b;
  --color-success: #6b8a6b;

  /* Category defaults */
  --color-leisure: #7a8b6e;
  --color-hobbies: #8b7a6e;
  --color-work: #5c6b7a;
  --color-exercise: #7a6e8b;
  --color-chores: #6b8a8a;

  /* Typography — light, airy */
  --font-family: -apple-system, 'Hiragino Sans', 'Hiragino Kaku Gothic Pro', system-ui, sans-serif;
  --font-weight-light: 300;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-size-xs: 0.6875rem;
  --font-size-sm: 0.8125rem;
  --font-size-base: 0.9375rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.5rem;
  --font-size-2xl: 2rem;
  --font-size-timer: 3.5rem;
  --letter-spacing: 0.05em;
  --letter-spacing-wide: 0.1em;
  --line-height: 1.8;
  --line-height-tight: 1.4;

  /* Spacing — generous Ma */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;

  /* Layout */
  --app-max-width: 430px;
  --nav-height: 56px;
  --header-height: 52px;

  /* Shadows — barely there */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 4px 16px rgba(0, 0, 0, 0.08);

  /* Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 400ms ease;

  /* Z-indices */
  --z-base: 1;
  --z-sticky: 10;
  --z-dropdown: 20;
  --z-modal: 100;
  --z-overlay: 200;
  --z-ghost: 300;
  --z-notification: 400;
}