/* Base styles - Reset, typography, and CSS variables */

:root {
  /* Color palette - default theme */
  --color-primary: #4CAF50;
  --color-primary-light: #81C784;
  --color-primary-dark: #388E3C;
  --color-secondary: #FF9800;
  --color-accent: #E91E63;

  /* Background colors */
  --color-bg: #F5F5F5;
  --color-bg-card: #FFFFFF;
  --color-bg-overlay: rgba(0, 0, 0, 0.5);

  /* Text colors */
  --color-text: #333333;
  --color-text-light: #666666;
  --color-text-muted: #999999;
  --color-text-inverse: #FFFFFF;

  /* Feedback colors */
  --color-success: #4CAF50;
  --color-error: #F44336;
  --color-warning: #FF9800;

  /* Spacing */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-xxl: 48px;

  /* Border radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;
  --radius-round: 50%;

  /* Typography */
  --font-family: 'Nunito', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-size-sm: 14px;
  --font-size-md: 18px;
  --font-size-lg: 24px;
  --font-size-xl: 36px;
  --font-size-xxl: 48px;
  --font-size-display: 72px;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.12);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 20px rgba(0, 0, 0, 0.15);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 300ms ease;
  --transition-slow: 500ms ease;

  /* Touch targets */
  --touch-target-min: 44px;
  --keypad-button-size: 70px;
}

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

/* Prevent text selection on interactive elements */
button, .keypad-btn {
  -webkit-user-select: none;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}

/* Base styles */
html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-md);
  line-height: 1.5;
  color: var(--color-text);
  background-color: var(--color-bg);
  min-height: 100vh;
  overflow-x: hidden;
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

/* Typography */
h1, h2, h3 {
  font-weight: 700;
  line-height: 1.2;
}

h1 {
  font-size: var(--font-size-xxl);
}

h2 {
  font-size: var(--font-size-xl);
}

h3 {
  font-size: var(--font-size-lg);
}

/* Accessibility */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Focus styles */
:focus-visible {
  outline: 3px solid var(--color-primary);
  outline-offset: 2px;
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #1a1a2e;
    --color-bg-card: #16213e;
    --color-text: #EAEAEA;
    --color-text-light: #CCCCCC;
    --color-text-muted: #888888;
  }
}