:root {
  font-family: system-ui, Avenir, Helvetica, Arial, sans-serif;
  line-height: 1.5;
  font-weight: 400;

  color-scheme: light dark;

  font-synthesis: none;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;

  /* Theme Colors - Dark Mode (Default) */
  --color-text-primary: rgba(255, 255, 255, 0.87);
  --color-text-secondary: rgba(255, 255, 255, 0.6);
  --color-text-muted: rgba(255, 255, 255, 0.4);

  --color-bg-primary: #242424;
  --color-bg-secondary: #1a1a1a;
  --color-bg-elevated: #2d2d2d;
  --color-bg-card: #2d2d2d;
  --color-bg-input: #1a1a1a;

  --color-border: rgba(255, 255, 255, 0.1);
  --color-border-focus: rgba(255, 255, 255, 0.2);

  /* Brand Colors */
  --color-primary: #667eea;
  --color-primary-dark: #5568d3;
  --color-primary-light: #7d8ff0;
  --color-secondary: #764ba2;

  /* Status Colors */
  --color-success: #4CAF50;
  --color-success-dark: #45a049;
  --color-success-light: #66bb6a;
  --color-success-bg: rgba(76, 175, 80, 0.1);
  --color-success-border: rgba(76, 175, 80, 0.3);

  --color-warning: #ff9800;
  --color-warning-dark: #f57c00;
  --color-warning-light: #ffb74d;
  --color-warning-bg: rgba(255, 152, 0, 0.1);
  --color-warning-border: rgba(255, 152, 0, 0.3);

  --color-error: #f44336;
  --color-error-dark: #d32f2f;
  --color-error-light: #ff6b6b;
  --color-error-bg: rgba(244, 67, 54, 0.1);
  --color-error-border: rgba(244, 67, 54, 0.3);

  --color-info: #2196F3;
  --color-info-dark: #1976D2;
  --color-info-light: #64b5f6;
  --color-info-bg: rgba(33, 150, 243, 0.1);
  --color-info-border: rgba(33, 150, 243, 0.3);

  /* Gradient */
  --gradient-primary: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 10px 20px rgba(0, 0, 0, 0.4);
  --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.5);

  /* Typography */
  --font-size-xs: 12px;
  --font-size-sm: 14px;
  --font-size-base: 16px;
  --font-size-lg: 18px;
  --font-size-xl: 24px;
  --font-size-2xl: 32px;

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

  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --radius-xl: 12px;

  color: var(--color-text-primary);
  background-color: var(--color-bg-primary);
}

a {
  font-weight: 500;
  color: #646cff;
  text-decoration: inherit;
}
a:hover {
  color: #535bf2;
}

body {
  margin: 0;
  display: flex;
  place-items: center;
  min-width: 320px;
  min-height: 100vh;
}

h1 {
  font-size: 3.2em;
  line-height: 1.1;
}

button {
  border-radius: 8px;
  border: 1px solid transparent;
  padding: 0.6em 1.2em;
  font-size: 1em;
  font-weight: 500;
  font-family: inherit;
  background-color: #1a1a1a;
  cursor: pointer;
  transition: border-color 0.25s;
}
button:hover {
  border-color: #646cff;
}
button:focus,
button:focus-visible {
  outline: 4px auto -webkit-focus-ring-color;
}

.card {
  padding: 2em;
}

#app {
  max-width: 1280px;
  margin: 0 auto;
  padding: 2rem;
  text-align: center;
}

@media (prefers-color-scheme: light) {
  :root {
    /* Theme Colors - Light Mode */
    --color-text-primary: #213547;
    --color-text-secondary: #666;
    --color-text-muted: #999;

    --color-bg-primary: #f5f5f5;
    --color-bg-secondary: #ffffff;
    --color-bg-elevated: #ffffff;
    --color-bg-card: #ffffff;
    --color-bg-input: #ffffff;

    --color-border: #ddd;
    --color-border-focus: #ccc;

    /* Status colors stay the same in light mode */
    /* But we adjust backgrounds for better contrast */
    --color-success-bg: #d4edda;
    --color-success-border: #c3e6cb;

    --color-warning-bg: #fff3cd;
    --color-warning-border: #ffeaa7;

    --color-error-bg: #f8d7da;
    --color-error-border: #f5c6cb;

    --color-info-bg: #d1ecf1;
    --color-info-border: #bee5eb;

    /* Shadows for light mode (lighter) */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 20px rgba(0, 0, 0, 0.15);
    --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.2);

    color: var(--color-text-primary);
    background-color: var(--color-bg-primary);
  }

  a:hover {
    color: #747bff;
  }

  button {
    background-color: #f9f9f9;
  }
}

/* Mobile Responsive Typography and Spacing */
@media (max-width: 480px) {
  :root {
    /* Reduce font sizes for mobile */
    --font-size-xs: 11px;
    --font-size-sm: 13px;
    --font-size-base: 14px;
    --font-size-lg: 16px;
    --font-size-xl: 20px;
    --font-size-2xl: 24px;

    /* Reduce spacing for mobile */
    --spacing-xs: 4px;
    --spacing-sm: 6px;
    --spacing-md: 12px;
    --spacing-lg: 16px;
    --spacing-xl: 20px;

    /* Reduce shadows for mobile */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 2px 4px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 4px 8px rgba(0, 0, 0, 0.3);
    --shadow-xl: 0 8px 16px rgba(0, 0, 0, 0.4);
  }

  h1 {
    font-size: 2em;
  }

  .card {
    padding: 1em;
  }

  #app {
    padding: 1rem;
  }
}

@media (min-width: 481px) and (max-width: 768px) {
  :root {
    /* Slightly reduced sizes for tablets */
    --font-size-base: 15px;
    --font-size-lg: 17px;
    --font-size-xl: 22px;
    --font-size-2xl: 28px;

    --spacing-md: 14px;
    --spacing-lg: 20px;
    --spacing-xl: 28px;
  }

  h1 {
    font-size: 2.5em;
  }

  .card {
    padding: 1.5em;
  }

  #app {
    padding: 1.5rem;
  }
}