/* ════════════════════════════════════════════════════════════════════════
   BASE · reset, layout e utilitários
   Lei: docs/03_DESIGN_SYSTEM.md §4 (a11y) e §8 (ordem de declarações)
   ════════════════════════════════════════════════════════════════════════ */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100dvh;
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: 1.5;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  margin: 0;
  font-weight: var(--fw-semibold);
  letter-spacing: var(--tracking-tight);
  line-height: 1.25;
}
h1 { font-size: var(--text-3xl); letter-spacing: var(--tracking-tighter); }
h2 { font-size: var(--text-2xl); }
h3 { font-size: var(--text-lg); }

p { margin: 0 0 var(--space-4); }
p:last-child { margin-bottom: 0; }

a {
  color: var(--primary);
  text-decoration: none;
  transition: color var(--duration-fast) var(--ease);
}
a:hover { text-decoration: underline; }

img, svg { max-width: 100%; }
svg { flex-shrink: 0; }

button, input, select, textarea { font: inherit; color: inherit; }

/* ── Acessibilidade obrigatória (03 §4) ────────────────────────────── */

*:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

.u-skip-link {
  position: absolute;
  top: -100px; left: var(--space-4);
  z-index: var(--z-tooltip);
  padding: var(--space-3) var(--space-4);
  color: var(--primary-text);
  background: var(--primary);
  border-radius: var(--radius-md);
  transition: top var(--duration-fast) var(--ease);
}
.u-skip-link:focus { top: var(--space-4); }

.u-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;
}

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

/* ── Layout ─────────────────────────────────────────────────────────── */

.l-container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--space-4);
}
.l-container--sm { max-width: var(--container-sm); }

.l-page {
  padding-block: var(--space-6) var(--space-12);
}

/* Espaço para a bottom-nav no mobile */
@media (max-width: 767px) {
  .l-page { padding-bottom: calc(var(--bottom-nav-h) + var(--space-8)); }
}

.l-center {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100dvh;
  padding: var(--space-4);
}

.l-stack        { display: flex; flex-direction: column; gap: var(--space-4); }
.l-stack--sm    { gap: var(--space-2); }
.l-stack--lg    { gap: var(--space-6); }
.l-row          { display: flex; align-items: center; gap: var(--space-3); }
.l-row--between { justify-content: space-between; }
.l-row--wrap    { flex-wrap: wrap; }

.l-grid {
  display: grid;
  gap: var(--space-4);
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
}

/* ── Utilitários ────────────────────────────────────────────────────── */

.u-muted     { color: var(--text-muted); }
.u-secondary { color: var(--text-secondary); }
.u-sm        { font-size: var(--text-sm); }
.u-xs        { font-size: var(--text-xs); }
.u-medium    { font-weight: var(--fw-medium); }
.u-semibold  { font-weight: var(--fw-semibold); }
.u-center    { text-align: center; }
.u-mono      { font-family: var(--font-mono); }
.u-grow      { flex: 1; }
.u-hidden    { display: none !important; }
.u-nowrap    { white-space: nowrap; }

.u-truncate {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

@media (max-width: 767px)  { .u-desktop-only { display: none !important; } }
@media (min-width: 768px)  { .u-mobile-only  { display: none !important; } }