/* base.css — Fundação CSS, Reset, Tipografia, Layout e Acessibilidade */

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

html {
  font-size: 16px;
  line-height: 1.6;
  -webkit-text-size-adjust: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-base);
  color: var(--color-text-body);
  background-color: var(--color-bg);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Tipografia */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  color: var(--color-text);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.015em;
  margin-bottom: var(--space-3);
}

h1 { font-size: var(--font-size-3xl); }
h2 { font-size: var(--font-size-2xl); }
h3 { font-size: var(--font-size-xl); }
h4 { font-size: var(--font-size-lg); }

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

p:last-child {
  margin-bottom: 0;
}

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

a:hover {
  color: var(--color-primary);
  text-decoration: underline;
}

img, svg, video {
  display: block;
  max-width: 100%;
  height: auto;
}

/* Acessibilidade — Skip Link & Foco */
:focus-visible {
  outline: 3px solid var(--color-primary-light);
  outline-offset: 2px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: var(--space-2);
  background: var(--color-primary);
  color: var(--color-primary-ink);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-sm);
  font-weight: 600;
  z-index: 9999;
  text-decoration: none;
  box-shadow: var(--shadow-lg);
}

.skip-link:focus {
  left: var(--space-4);
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

/* Layout Containers & Grids */
.container {
  width: 100%;
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--space-4);
  padding-right: var(--space-4);
}

@media (min-width: 768px) {
  .container {
    padding-left: var(--space-6);
    padding-right: var(--space-6);
  }
}

main.container {
  flex: 1 0 auto;
  padding-top: var(--space-6);
  padding-bottom: var(--space-10);
}

/* Sistema de Grids Responsivos */
.grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-5);
  margin-bottom: var(--space-6);
}

@media (min-width: 640px) {
  .grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.grid-2 {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-5);
}

@media (min-width: 768px) {
  .grid-2 {
    grid-template-columns: repeat(2, 1fr);
  }
}

.flex {
  display: flex;
  gap: var(--space-4);
}

.flex-wrap {
  flex-wrap: wrap;
}

.items-center {
  align-items: center;
}

.justify-between {
  justify-content: space-between;
}

/* Utilitários Gerais */
.muted {
  color: var(--color-muted);
  font-size: var(--font-size-sm);
}

.lead {
  font-size: var(--font-size-lg);
  line-height: 1.7;
  color: var(--color-text-body);
  margin-bottom: var(--space-5);
}

.mono {
  font-family: var(--font-mono);
  font-size: 0.9em;
}

.rich-text {
  line-height: 1.75;
  color: var(--color-text-body);
}

.rich-text p {
  margin-bottom: var(--space-4);
}

.rich-text ul, .rich-text ol {
  margin-left: var(--space-6);
  margin-bottom: var(--space-4);
}

.rich-text li {
  margin-bottom: var(--space-1);
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}