/* CSS Variables - Design System for 中田税理士事務所 */

:root {
  /* Primary Colors - Professional Blue Palette */
  --color-primary: #1a365d;
  --color-primary-light: #2c5282;
  --color-primary-dark: #0d1f3c;
  --color-primary-hover: #2c5282;
  
  /* Secondary Colors */
  --color-secondary: #2d3748;
  --color-secondary-light: #4a5568;
  --color-secondary-dark: #1a202c;
  
  /* Accent Colors */
  --color-accent: #3182ce;
  --color-accent-light: #4299e1;
  --color-accent-dark: #2b6cb0;
  
  /* Neutral Colors */
  --color-white: #ffffff;
  --color-gray-50: #f7fafc;
  --color-gray-100: #edf2f7;
  --color-gray-200: #e2e8f0;
  --color-gray-300: #cbd5e0;
  --color-gray-400: #a0aec0;
  --color-gray-500: #718096;
  --color-gray-600: #4a5568;
  --color-gray-700: #2d3748;
  --color-gray-800: #1a202c;
  --color-gray-900: #171923;
  --color-black: #000000;
  
  /* Status Colors */
  --color-success: #38a169;
  --color-success-light: #48bb78;
  --color-success-dark: #2f855a;
  
  --color-warning: #d69e2e;
  --color-warning-light: #ecc94b;
  --color-warning-dark: #b7791f;
  
  --color-error: #e53e3e;
  --color-error-light: #fc8181;
  --color-error-dark: #c53030;
  
  --color-info: #3182ce;
  --color-info-light: #63b3ed;
  --color-info-dark: #2b6cb0;
  
  /* Typography */
  --font-family-primary: 'Noto Sans JP', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-family-fallback: 'Hiragino Sans', 'Hiragino Kaku Gothic ProN', 'Meiryo', sans-serif;
  
  /* Font Sizes */
  --font-size-xs: 0.75rem;    /* 12px */
  --font-size-sm: 0.875rem;   /* 14px */
  --font-size-base: 1rem;     /* 16px */
  --font-size-lg: 1.125rem;   /* 18px */
  --font-size-xl: 1.25rem;    /* 20px */
  --font-size-2xl: 1.5rem;    /* 24px */
  --font-size-3xl: 1.875rem;  /* 30px */
  --font-size-4xl: 2.25rem;   /* 36px */
  --font-size-5xl: 3rem;      /* 48px */
  --font-size-6xl: 3.75rem;   /* 60px */
  
  /* Font Weights */
  --font-weight-light: 300;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --font-weight-extrabold: 800;
  
  /* Line Heights */
  --line-height-tight: 1.25;
  --line-height-snug: 1.375;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.625;
  --line-height-loose: 2;
  
  /* Spacing */
  --spacing-0: 0;
  --spacing-1: 0.25rem;   /* 4px */
  --spacing-2: 0.5rem;    /* 8px */
  --spacing-3: 0.75rem;   /* 12px */
  --spacing-4: 1rem;      /* 16px */
  --spacing-5: 1.25rem;   /* 20px */
  --spacing-6: 1.5rem;    /* 24px */
  --spacing-8: 2rem;      /* 32px */
  --spacing-10: 2.5rem;   /* 40px */
  --spacing-12: 3rem;     /* 48px */
  --spacing-16: 4rem;     /* 64px */
  --spacing-20: 5rem;     /* 80px */
  --spacing-24: 6rem;     /* 96px */
  --spacing-32: 8rem;     /* 128px */
  
  /* Border Radius */
  --radius-none: 0;
  --radius-sm: 0.125rem;  /* 2px */
  --radius-md: 0.375rem;  /* 6px */
  --radius-lg: 0.5rem;    /* 8px */
  --radius-xl: 0.75rem;   /* 12px */
  --radius-2xl: 1rem;     /* 16px */
  --radius-full: 9999px;
  
  /* Shadows */
  --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
  --shadow-inner: inset 0 2px 4px 0 rgba(0, 0, 0, 0.06);
  
  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-normal: 250ms ease-in-out;
  --transition-slow: 350ms ease-in-out;
  
  /* Z-Index Scale */
  --z-index-dropdown: 1000;
  --z-index-sticky: 1020;
  --z-index-fixed: 1030;
  --z-index-modal-backdrop: 1040;
  --z-index-modal: 1050;
  --z-index-popover: 1060;
  --z-index-tooltip: 1070;
  --z-index-cookie-banner: 1080;
  
  /* Container Widths */
  --container-sm: 640px;
  --container-md: 768px;
  --container-lg: 1024px;
  --container-xl: 1280px;
  --container-2xl: 1536px;
  
  /* Header Height */
  --header-height: 80px;
  --header-height-mobile: 64px;
  
  /* Footer Height */
  --footer-height: auto;
}

/* Dark Mode Variables (optional - for future use) */
@media (prefers-color-scheme: dark) {
  :root {
    --color-bg-primary: var(--color-gray-900);
    --color-bg-secondary: var(--color-gray-800);
    --color-text-primary: var(--color-white);
    --color-text-secondary: var(--color-gray-300);
  }
}