/* ==========================================================================
   Iris · BASE
   Reset, tipografia, layout e utilitários. Só usa tokens.
   ========================================================================== */

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-h) + var(--space-4));
}

body {
  margin: 0;
  min-height: 100vh;
  min-height: 100dvh;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: var(--text-base);
  font-weight: var(--weight-regular);
  line-height: var(--leading-normal);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  overflow-x: clip;
  transition: background-color var(--dur-base) var(--ease-out), color var(--dur-base) var(--ease-out);
}

img, svg, video, canvas { display: block; max-width: 100%; }
button, input, select, textarea { font: inherit; color: inherit; }
button { cursor: pointer; }
a { color: inherit; text-decoration: none; }
ul, ol { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, h4, p, figure, blockquote, dl, dd { margin: 0; }
summary { cursor: pointer; }

h1, h2, h3, h4 {
  font-weight: var(--weight-medium);
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-tight);
  text-wrap: balance;
}
p { text-wrap: pretty; }

::selection { background: var(--accent); color: var(--accent-contrast); }

:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
  border-radius: var(--radius-xs);
}

/* Layout ------------------------------------------------------------------ */
.container {
  width: 100%;
  max-width: calc(var(--container) + var(--gutter) * 2);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.container--narrow { max-width: calc(var(--container-narrow) + var(--gutter) * 2); }

.section { padding-block: var(--section-y); }
.section--flush { padding-top: 0; }
.stack > * + * { margin-top: var(--stack-gap, var(--space-4)); }

/* Tipografia utilitária --------------------------------------------------- */
.display {
  font-family: var(--font-display);
  font-weight: var(--weight-regular);
  letter-spacing: var(--tracking-snug);
}
.display em, .serif-accent {
  font-family: var(--font-display);
  font-style: italic;
  font-weight: var(--weight-regular);
  letter-spacing: var(--tracking-snug);
}
.eyebrow {
  font-size: var(--text-xs);
  font-weight: var(--weight-medium);
  letter-spacing: var(--tracking-caps);
  text-transform: uppercase;
  color: var(--text-faint);
}
.muted { color: var(--text-muted); }
.faint { color: var(--text-faint); }
.mono { font-family: var(--font-mono); font-feature-settings: "tnum"; }
.tnum { font-variant-numeric: tabular-nums; }

/* Acessibilidade ---------------------------------------------------------- */
.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  margin: -1px; padding: 0;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}
.skip-link {
  position: fixed;
  top: var(--space-3); left: var(--space-3);
  z-index: 100;
  padding: var(--space-2) var(--space-4);
  background: var(--inverse-bg);
  color: var(--inverse-text);
  border-radius: var(--radius-sm);
  transform: translateY(-200%);
}
.skip-link:focus { transform: none; }

/* Revelar ao rolar (ativado por JS, sem JS tudo aparece) ------------------ */
.js .reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity var(--dur-slow) var(--ease-out), transform var(--dur-slow) var(--ease-out);
  transition-delay: calc(var(--i, 0) * 70ms);
}
.js .reveal.is-in { opacity: 1; transform: none; }

@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;
  }
  .js .reveal { opacity: 1; transform: none; }
}