:root {
  /* Light Mode - 高級感のあるモノクロ */
  --primary: #0f172a;
  --primary-hover: #1e293b;
  --primary-light: #f1f5f9;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --accent-light: #eff6ff;

  --gray-50: #fafafa;
  --gray-100: #f5f5f5;
  --gray-200: #e5e5e5;
  --gray-300: #d4d4d4;
  --gray-400: #a3a3a3;
  --gray-500: #737373;
  --gray-600: #525252;
  --gray-700: #404040;
  --gray-800: #262626;
  --gray-900: #171717;

  --success: #059669;
  --success-light: #ecfdf5;
  --warning: #d97706;
  --warning-light: #fffbeb;
  --danger: #dc2626;
  --danger-light: #fef2f2;

  --bg-primary: #ffffff;
  --bg-secondary: #fafafa;
  --bg-tertiary: #f5f5f5;
  --text-primary: #171717;
  --text-secondary: #525252;
  --text-muted: #737373;
  --border: #e5e5e5;
  --border-light: #f5f5f5;
  --shadow: rgba(0, 0, 0, 0.08);
  --shadow-lg: rgba(0, 0, 0, 0.12);
}

/* Dark Mode */
@media (prefers-color-scheme: dark) {
  :root {
    --primary: #f8fafc;
    --primary-hover: #e2e8f0;
    --primary-light: #1e293b;
    --accent: #60a5fa;
    --accent-hover: #3b82f6;
    --accent-light: #1e3a8a;

    --gray-50: #262626;
    --gray-100: #404040;
    --gray-200: #525252;
    --gray-300: #737373;
    --gray-400: #a3a3a3;
    --gray-500: #d4d4d4;
    --gray-600: #e5e5e5;
    --gray-700: #f5f5f5;
    --gray-800: #fafafa;
    --gray-900: #ffffff;

    --success: #10b981;
    --success-light: #064e3b;
    --warning: #f59e0b;
    --warning-light: #78350f;
    --danger: #f87171;
    --danger-light: #7f1d1d;

    --bg-primary: #171717;
    --bg-secondary: #262626;
    --bg-tertiary: #404040;
    --text-primary: #fafafa;
    --text-secondary: #d4d4d4;
    --text-muted: #a3a3a3;
    --border: #404040;
    --border-light: #262626;
    --shadow: rgba(0, 0, 0, 0.3);
    --shadow-lg: rgba(0, 0, 0, 0.4);
  }
}

[data-theme="dark"] {
  --primary: #f8fafc;
  --primary-hover: #e2e8f0;
  --primary-light: #1e293b;
  --accent: #60a5fa;
  --accent-hover: #3b82f6;
  --accent-light: #1e3a8a;

  --gray-50: #262626;
  --gray-100: #404040;
  --gray-200: #525252;
  --gray-300: #737373;
  --gray-400: #a3a3a3;
  --gray-500: #d4d4d4;
  --gray-600: #e5e5e5;
  --gray-700: #f5f5f5;
  --gray-800: #fafafa;
  --gray-900: #ffffff;

  --success: #10b981;
  --success-light: #064e3b;
  --warning: #f59e0b;
  --warning-light: #78350f;
  --danger: #f87171;
  --danger-light: #7f1d1d;

  --bg-primary: #171717;
  --bg-secondary: #262626;
  --bg-tertiary: #404040;
  --text-primary: #fafafa;
  --text-secondary: #d4d4d4;
  --text-muted: #a3a3a3;
  --border: #404040;
  --border-light: #262626;
  --shadow: rgba(0, 0, 0, 0.3);
  --shadow-lg: rgba(0, 0, 0, 0.4);
}

[data-theme="light"] {
  --primary: #0f172a;
  --primary-hover: #1e293b;
  --primary-light: #f1f5f9;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --accent-light: #eff6ff;

  --gray-50: #fafafa;
  --gray-100: #f5f5f5;
  --gray-200: #e5e5e5;
  --gray-300: #d4d4d4;
  --gray-400: #a3a3a3;
  --gray-500: #737373;
  --gray-600: #525252;
  --gray-700: #404040;
  --gray-800: #262626;
  --gray-900: #171717;

  --success: #059669;
  --success-light: #ecfdf5;
  --warning: #d97706;
  --warning-light: #fffbeb;
  --danger: #dc2626;
  --danger-light: #fef2f2;

  --bg-primary: #ffffff;
  --bg-secondary: #fafafa;
  --bg-tertiary: #f5f5f5;
  --text-primary: #171717;
  --text-secondary: #525252;
  --text-muted: #737373;
  --border: #e5e5e5;
  --border-light: #f5f5f5;
  --shadow: rgba(0, 0, 0, 0.08);
  --shadow-lg: rgba(0, 0, 0, 0.12);
}