/* Reset + design tokens shared by every page. */

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

html, body {
  margin: 0;
  padding: 0;
}

:root {
  --color-bg: #f4f6fb;
  --color-surface: #ffffff;
  --color-surface-alt: #eef1f9;
  --color-border: #dde2ee;
  --color-text: #1c2333;
  --color-text-muted: #5b6478;

  --color-primary: #3454d1;
  --color-primary-dark: #253c9c;
  --color-primary-contrast: #ffffff;

  --color-correct: #1f9d55;
  --color-correct-bg: #e4f8ec;
  --color-incorrect: #d1403f;
  --color-incorrect-bg: #fdeceb;

  --color-facil: #1f9d55;
  --color-facil-bg: #e4f8ec;
  --color-medio: #b9750f;
  --color-medio-bg: #fbf0dd;
  --color-dificil: #c73a3a;
  --color-dificil-bg: #fbe6e6;

  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;

  --space-1: 4px;
  --space-2: 8px;
  --space-3: 16px;
  --space-4: 24px;
  --space-5: 40px;
  --space-6: 64px;

  --shadow-sm: 0 1px 2px rgba(28, 35, 51, 0.06);
  --shadow-md: 0 8px 24px rgba(28, 35, 51, 0.08);

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --max-content-width: 960px;
}

body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-weight: 700;
  line-height: 1.25;
  color: var(--color-text);
}

p {
  margin: 0 0 var(--space-3);
}

a {
  color: var(--color-primary);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

a:focus-visible,
button:focus-visible,
input:focus-visible {
  outline: 3px solid var(--color-primary);
  outline-offset: 2px;
}

img {
  max-width: 100%;
  display: block;
}