/* CSS Custom Properties (Variables) - Professional Financial Theme */
:root {
  /* Modern Color Palette */
  --primary-color: #3b82f6;
  --secondary-color: #2563eb;
  --accent-color: #06b6d4;
  --background-color: #f8fafc;
  --text-color: #0f172a;
  --text-secondary: #64748b;
  --light-bg: #ffffff;
  --surface-color: #ffffff;
  --border-color: #e2e8f0;
  --input-border: #cbd5e1;
  --success-color: #10b981;
  --gray-color: #64748b;
  --error-color: #ef4444;
  --on-primary-color: #ffffff;
  --surface-hover: #f1f5f9;
  --surface-active: #e2e8f0;

  --tooltip-bg: #1e293b;
  --tooltip-text: #f8fafc;

  /* Method Section Accent Colors */
  --accent-intro: #06b6d4;
  --accent-method1: #8b5cf6;
  --accent-method2: #f59e0b;
  --accent-method3: #10b981;
  --accent-results: #ec4899;

  /* Spacing */
  --border-radius: 12px;
  --border-radius-small: 6px;
  --section-spacing: 24px;
  --gap-small: 8px;
  --gap-medium: 16px;
  --gap-large: 24px;

  /* Typography - Professional Font Stack */
  --font-family-base: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  --font-family-mono: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
  --font-size-normal: 16px;
  --font-size-small: 13px;
  --font-size-medium: 15px;
  --font-size-large: 1.5em;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;

  /* Shadows - Refined and Professional */
  --box-shadow-light: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px -1px rgba(0, 0, 0, 0.1);
  --box-shadow-medium: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
  --box-shadow-large: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);

  /* Transitions */
  --transition-standard: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-smooth: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html[data-theme='dark'] {
  /* Dark Mode - Sleek Financial Interface */
  --background-color: #0a0e1a;
  --text-color: #f8fafc;
  --text-secondary: #94a3b8;
  --light-bg: #141827;
  --surface-color: #1a1f35;
  --border-color: #1e293b;
  --input-border: #334155;

  --surface-hover: #1e2538;
  --surface-active: #242b42;

  --tooltip-bg: #1e293b;
  --tooltip-text: #f8fafc;

  /* Enhanced shadows for dark mode */
  --box-shadow-light: 0 1px 3px 0 rgba(0, 0, 0, 0.3), 0 1px 2px -1px rgba(0, 0, 0, 0.3);
  --box-shadow-medium: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -2px rgba(0, 0, 0, 0.4);
  --box-shadow-large: 0 10px 15px -3px rgba(0, 0, 0, 0.5), 0 4px 6px -4px rgba(0, 0, 0, 0.5);

  /* Method Section Accent Colors - Same as light mode */
  --accent-intro: #06b6d4;
  --accent-method1: #8b5cf6;
  --accent-method2: #f59e0b;
  --accent-method3: #10b981;
  --accent-results: #ec4899;
}

html[data-theme='grayscale'] {
  /* Grayscale Mode - Dark gray preference */
  --background-color: #2a2a2a;
  --text-color: #f0f0f0;
  --text-secondary: #b8b8b8;
  --light-bg: #1f1f1f;
  --surface-color: #262626;
  --border-color: #3a3a3a;
  --input-border: #454545;
  --primary-color: #7a7a7a;
  --secondary-color: #6a6a6a;
  --accent-color: #888888;

  --surface-hover: #323232;
  --surface-active: #3a3a3a;

  --tooltip-bg: #1f1f1f;
  --tooltip-text: #f0f0f0;

  /* Grayscale shadows */
  --box-shadow-light: 0 1px 3px 0 rgba(0, 0, 0, 0.4), 0 1px 2px -1px rgba(0, 0, 0, 0.3);
  --box-shadow-medium: 0 4px 6px -1px rgba(0, 0, 0, 0.5), 0 2px 4px -2px rgba(0, 0, 0, 0.4);
  --box-shadow-large: 0 10px 15px -3px rgba(0, 0, 0, 0.6), 0 4px 6px -4px rgba(0, 0, 0, 0.5);

  /* Method Section Accent Colors - Grayscale (no color) */
  --accent-intro: #6a6a6a;
  --accent-method1: #6a6a6a;
  --accent-method2: #6a6a6a;
  --accent-method3: #6a6a6a;
  --accent-results: #6a6a6a;
}