body {
  min-height: 100vh;
  color: var(--color-text);
  background: var(--color-background);
  transition:
    color var(--transition-medium),
    background-color var(--transition-medium);
}
body.has-open-overlay,
body.has-open-navigation {
  overflow: hidden;
}
body,
button,
a,
input,
select,
textarea {
  color: inherit;
}
a {
  color: var(--color-primary-strong);
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
  text-underline-offset: 0.2em;
}
button {
  border: 0;
}
h1 {
  margin-bottom: var(--space-3);
  font-size: var(--font-size-2xl);
  line-height: 1.05;
  letter-spacing: -0.035em;
}
h2 {
  margin-bottom: var(--space-2);
  font-size: var(--font-size-lg);
  line-height: 1.25;
}
h3 {
  margin-bottom: var(--space-2);
  font-size: var(--font-size-md);
}
p {
  color: var(--color-muted);
  line-height: 1.65;
}
:focus-visible {
  outline: 3px solid var(--color-focus);
  outline-offset: 3px;
}
::selection {
  color: var(--color-text);
  background: var(--color-primary-soft);
}
.visually-hidden {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}
.skip-link {
  position: fixed;
  z-index: 100;
  top: var(--space-3);
  left: var(--space-3);
  padding: var(--space-3) var(--space-4);
  color: #fff;
  background: var(--color-primary-strong);
  border-radius: var(--radius-small);
  transform: translateY(-160%);
  transition: transform var(--transition-fast);
}
.skip-link:focus {
  transform: translateY(0);
}
.surface-card,
.initial-loading,
.fatal-error {
  color: var(--color-text);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-large);
  box-shadow: var(--shadow-card);
}
.initial-loading,
.fatal-error {
  width: min(42rem, calc(100% - 3rem));
  margin: 12vh auto;
  padding: var(--space-8);
}
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}

/* M10 — leitura ampliada, controles nativos e alto contraste */
:where(main, section, article, aside, header, footer, div) {
  min-width: 0;
}

:where(input, select, textarea) {
  max-width: 100%;
  color-scheme: inherit;
}

:where(input, textarea)::placeholder {
  color: var(--color-muted);
  opacity: 1;
}

:where(button, a, input, select, textarea, summary) {
  scroll-margin: 6rem 1rem;
}

:where(p, li, dd, dt, label, strong, span) {
  overflow-wrap: anywhere;
}

html {
  scrollbar-color: var(--color-border-strong) var(--color-background);
  scrollbar-gutter: stable;
}

* {
  scrollbar-width: thin;
  scrollbar-color: var(--color-border-strong) transparent;
}

*::-webkit-scrollbar {
  width: 0.7rem;
  height: 0.7rem;
}

*::-webkit-scrollbar-thumb {
  background: var(--color-border-strong);
  border: 0.16rem solid transparent;
  border-radius: var(--radius-pill);
  background-clip: padding-box;
}

*::-webkit-scrollbar-track {
  background: transparent;
}

@media (forced-colors: active) {
  :focus-visible {
    outline: 2px solid Highlight;
  }

  .button,
  .icon-button,
  .filter-chip,
  .badge,
  .surface-card,
  .modal,
  .side-panel,
  .settings-card,
  .dashboard-card,
  .materia-card,
  .tema-accordion,
  .assunto-row {
    border: 1px solid CanvasText;
    box-shadow: none;
  }

  .progress__fill,
  .dashboard-state-row__fill {
    background: Highlight;
  }
}