/* ============================================================
   BASE — reset, elementos e tipografia padrão.
   Depende de tokens.css (carregue tokens.css ANTES deste).
   ============================================================ */

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

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

body {
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  font-family: var(--font-body);
  font-size: var(--body-md);
  line-height: 1.6;
  color: var(--on-surface);
  background: var(--background);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  font-feature-settings: "kern" 1, "liga" 1;
}

/* deixa o rodapé no fim mesmo com pouco conteúdo */
main { flex: 1 0 auto; }

/* ---- Títulos ---- */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  color: var(--primary);
  line-height: 1.15;
  text-wrap: balance;
  font-weight: 600;
}
h1 { font-size: var(--display-lg);  font-weight: 700; letter-spacing: -0.02em; }
h2 { font-size: var(--headline-lg); }
h3 { font-size: var(--headline-md); font-weight: 500; }

p { text-wrap: pretty; }

a { color: var(--hydrology-blue); text-decoration: none; }
a:hover { text-decoration: underline; }

strong { color: var(--on-surface); font-weight: 600; }

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

/* ---- Ícones (Material Symbols via Google Fonts) ---- */
.material-symbols-outlined {
  font-variation-settings: 'FILL' 0, 'wght' 400, 'GRAD' 0, 'opsz' 24;
  line-height: 1;
  user-select: none;
}

/* ---- Utilidades de tipografia técnica ---- */
.mono { font-family: var(--font-mono); }
.eyebrow {
  font-family: var(--font-mono);
  font-size: var(--label-md);
  font-weight: 500;
  letter-spacing: var(--tracking-widest);
  text-transform: uppercase;
  color: var(--secondary);
}

/* ---- Layout compartilhado ---- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--margin-mobile);
}
@media (min-width: 768px) {
  .container { padding-inline: var(--margin-desktop); }
}

.section { padding-block: clamp(3rem, 8vw, 6rem); }
.section--tight { padding-block: clamp(2.5rem, 6vw, 4rem); }
.bg-low   { background: var(--surface-container-low); }
.bg-paper { background: var(--paper-white); }
.border-y { border-block: 1px solid var(--outline-variant); }

.prose { max-width: var(--measure); }
.prose p + p { margin-top: 1.1em; }

/* ---- Texturas "cartográficas" (fundo) ---- */
.topo-grid {
  background-image:
    linear-gradient(to right,  var(--surface-container-highest) 1px, transparent 1px),
    linear-gradient(to bottom, var(--surface-container-highest) 1px, transparent 1px);
  background-size: 40px 40px;
}
.dot-grid {
  background-image: radial-gradient(var(--outline-variant) 1px, transparent 1px);
  background-size: 24px 24px;
}

/* ---- Acessibilidade ---- */
:focus-visible {
  outline: 2px solid var(--hydrology-blue);
  outline-offset: 2px;
}
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--primary);
  color: var(--on-primary);
  padding: 0.6rem 1rem;
  z-index: 100;
  border-radius: 0 0 var(--radius) 0;
}
.skip-link:focus { left: 0; }
.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) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}