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

html {
  height: 100%;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  font-family: var(--font-family);
  color: var(--color-body);
  background-color: var(--color-canvas);
  font-size: var(--font-body-size);
  font-weight: var(--font-body-weight);
  line-height: var(--font-body-line-height);
  letter-spacing: var(--font-body-letter-spacing);
}

main {
  flex: 1 0 auto;
}

/* Header e navegação */
.site-header {
  background-color: var(--color-surface-black);
  padding: 16px var(--spacing-lg);
}

.site-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1440px;
  margin: 0 auto;
}

.site-logo {
  color: var(--color-body-on-dark);
  text-decoration: none;
  font-weight: var(--font-body-strong-weight);
  font-size: var(--font-caption-size);
}

.site-logo-img {
  height: 56px;
  width: auto;
  display: block;
}

.site-nav-links {
  display: flex;
  gap: 24px;
}

.site-nav-links a {
  color: var(--color-body-on-dark);
  text-decoration: none;
  font-size: var(--font-caption-size);
}

.site-nav-links a:hover {
  color: var(--color-primary-on-dark);
}

/* Footer */
.site-footer {
  background-color: var(--color-canvas-parchment);
  color: var(--color-ink-muted-48);
  text-align: center;
  padding: 32px var(--spacing-lg);
  font-size: 12px;
}

/* Botão primário (pill, cor de destaque) */
.button-primary {
  display: inline-block;
  background-color: var(--color-primary);
  color: var(--color-on-primary);
  font-size: var(--font-caption-size);
  font-weight: var(--font-caption-weight);
  border: none;
  border-radius: var(--rounded-pill);
  padding: 12px 24px;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.1s ease;
}

.button-primary:active {
  transform: scale(0.95);
}

/* Tiles full-bleed (light/dark) */
.tile-light {
  background-color: var(--color-canvas);
  color: var(--color-ink);
  padding: var(--spacing-section) var(--spacing-lg);
  text-align: center;
}

.tile-parchment {
  background-color: var(--color-canvas-parchment);
  color: var(--color-ink);
  padding: var(--spacing-section) var(--spacing-lg);
  text-align: center;
}

.tile-dark {
  background-color: var(--color-surface-tile-1);
  color: var(--color-on-dark);
  padding: var(--spacing-section) var(--spacing-lg);
  text-align: center;
}

.tile-dark a {
  color: var(--color-primary-on-dark);
}

.tile-title {
  font-size: var(--font-display-lg-size);
  font-weight: var(--font-display-lg-weight);
  line-height: var(--font-display-lg-line-height);
  margin-bottom: 16px;
}

.tile-lead {
  font-size: var(--font-lead-size);
  font-weight: var(--font-lead-weight);
  line-height: var(--font-lead-line-height);
  margin-bottom: 32px;
}

@media (max-width: 640px) {
  .tile-title {
    font-size: 34px;
  }
  .site-nav-links {
    gap: 12px;
  }
}