/**
 * ====================================
 * AXONFLOW DESIGN SYSTEM
 * World-class SaaS design inspired by Stripe, Linear, Notion
 * ====================================
 */

:root {
  /* ===== Brand Colors ===== */
  --color-primary: #2B9B9B;
  --color-primary-dark: #1E5F5F;
  --color-primary-light: #7DD3D3;
  --color-primary-pale: #E6F7F7;

  /* ===== Neutral Palette ===== */
  --color-gray-50: #FAFBFC;
  --color-gray-100: #F4F6F8;
  --color-gray-200: #E8ECF0;
  --color-gray-300: #D1D9E0;
  --color-gray-400: #9BA7B4;
  --color-gray-500: #68768A;
  --color-gray-600: #4A5568;
  --color-gray-700: #2D3748;
  --color-gray-800: #1A202C;
  --color-gray-900: #0F1419;

  /* ===== Semantic Colors ===== */
  --color-success: #10B981;
  --color-success-dark: #059669;
  --color-success-light: #D1FAE5;

  --color-error: #EF4444;
  --color-error-dark: #DC2626;
  --color-error-light: #FEE2E2;

  --color-warning: #F59E0B;
  --color-warning-dark: #D97706;
  --color-warning-light: #FEF3C7;

  --color-info: #3B82F6;
  --color-info-dark: #2563EB;
  --color-info-light: #DBEAFE;

  /* ===== Text Colors ===== */
  --color-text-primary: #1A202C;
  --color-text-secondary: #68768A;
  --color-text-tertiary: #9BA7B4;
  --color-text-inverse: #FFFFFF;
  --color-text-link: #2B9B9B;
  --color-text-link-hover: #1E5F5F;

  /* ===== Background Colors ===== */
  --color-background-primary: #FFFFFF;
  --color-background-secondary: #FAFBFC;
  --color-background-tertiary: #F4F6F8;
  --color-background-elevated: #FFFFFF;
  --color-background-overlay: rgba(0, 0, 0, 0.5);
  --color-background-page: #F9FAFB;

  /* Light beige gradient (Airbnb-inspired) */
  --color-background-beige-start: #FAF9F7;
  --color-background-beige-end: #F5F3F0;

  /* ===== Border Colors ===== */
  --color-border-primary: #E8ECF0;
  --color-border-secondary: #D1D9E0;
  --color-border-focus: #2B9B9B;
  --color-border-error: #EF4444;
  --color-border-success: #10B981;

  /* ===== Spacing Scale (4px base) ===== */
  --spacing-xs: 0.25rem;   /* 4px */
  --spacing-sm: 0.5rem;    /* 8px */
  --spacing-md: 0.75rem;   /* 12px */
  --spacing-lg: 1rem;      /* 16px */
  --spacing-xl: 1.25rem;   /* 20px */
  --spacing-2xl: 1.5rem;   /* 24px */
  --spacing-3xl: 2rem;     /* 32px */
  --spacing-4xl: 2.5rem;   /* 40px */
  --spacing-5xl: 3rem;     /* 48px */

  /* ===== Border Radius ===== */
  --radius-xs: 4px;
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-2xl: 20px;
  --radius-full: 9999px;

  /* ===== Shadows (Elevation System) ===== */
  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07), 0 2px 4px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1), 0 4px 6px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.1), 0 10px 10px rgba(0, 0, 0, 0.04);
  --shadow-2xl: 0 25px 50px rgba(0, 0, 0, 0.15);

  /* Brand shadows */
  --shadow-brand-sm: 0 4px 20px rgba(43, 155, 155, 0.2);
  --shadow-brand-lg: 0 10px 40px rgba(43, 155, 155, 0.3);

  /* ===== Typography ===== */
  --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: 1.875rem;
  --text-4xl: 2.25rem;
  --text-5xl: 3rem;

  --font-light: 300;
  --font-normal: 400;
  --font-medium: 500;
  --font-semibold: 600;
  --font-bold: 700;
  --font-extrabold: 800;

  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', sans-serif;
  --font-mono: 'SF Mono', 'Monaco', 'Inconsolata', 'Roboto Mono', monospace;

  --leading-none: 1;
  --leading-tight: 1.25;
  --leading-snug: 1.375;
  --leading-normal: 1.5;
  --leading-relaxed: 1.625;
  --leading-loose: 2;

  --tracking-tighter: -0.05em;
  --tracking-tight: -0.025em;
  --tracking-normal: 0;
  --tracking-wide: 0.025em;
  --tracking-wider: 0.05em;

  /* ===== Transitions ===== */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 200ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 300ms cubic-bezier(0.4, 0, 0.2, 1);
}

*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--color-text-primary);
  background-color: var(--color-background-page);
  min-height: 100vh;
}

::-webkit-scrollbar {
  width: 12px;
  height: 12px;
}

::-webkit-scrollbar-track {
  background: var(--color-gray-100);
  border-radius: var(--radius-md);
}

::-webkit-scrollbar-thumb {
  background: var(--color-gray-300);
  border-radius: var(--radius-md);
  border: 3px solid var(--color-gray-100);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-gray-400);
}

:focus-visible {
  outline: 2px solid var(--color-border-focus);
  outline-offset: 2px;
}

::selection {
  background-color: var(--color-primary-pale);
  color: var(--color-text-primary);
}