/**
 * base.css — Reset e stili globali
 * Dipende da: tokens.css (deve essere caricato prima)
 */

/* ============================================================
   RESET MODERNO
============================================================ */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  /* Compensazione altezza navbar per i link anchor */
  scroll-padding-top: var(--nav-height);
}

body {
  font-family: var(--font-primary);
  font-size: var(--text-base);
  font-weight: var(--weight-regular);
  line-height: var(--leading-tight);
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  width: 100%;
}

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

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

a:hover {
  color: var(--color-primary-dark);
}

ul, ol {
  list-style: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

/* ============================================================
   CONTAINER — elemento layout principale
============================================================ */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--container-padding);
  padding-right: var(--container-padding);
}

/* ============================================================
   SEZIONE — struttura base per ogni sezione della pagina
============================================================ */
.section {
  padding-top: 50px;
  padding-bottom: 50px;
}

.section--alt {
  background-color: var(--color-bg-alt);
}

.section--dark {
  background-color: var(--color-bg-dark);
  color: var(--color-text-inverse);
}

/* ============================================================
   HEADER DI SEZIONE — pattern usato in ogni sezione
============================================================ */
.section__header {
  text-align: center;
  margin-bottom: var(--space-16);
}

.section__title {
  font-size: var(--text-4xl);
  font-weight: var(--weight-bold);
  color: var(--color-text);
  line-height: var(--leading-tight);
}

.section--dark .section__title {
  color: var(--color-text-inverse);
}

.section__subtitle {
  font-size: var(--text-xl);
  color: var(--color-text-secondary);
  margin-top: var(--space-3);
  font-weight: var(--weight-medium);
}

.section__divider {
  width: 60px;
  height: 4px;
  background: var(--color-primary);
  border-radius: var(--radius-full);
  margin: var(--space-3) auto 0;
}

/* ============================================================
   TIPOGRAFIA UTILITARIA
============================================================ */
h1, h2, h3, h4, h5, h6 {
  font-weight: var(--weight-bold);
  /*line-height: var(--leading-tight);*/
  margin: 0;
  color: var(--color-text);
}

.text-primary   { color: var(--color-primary); }
.text-secondary { color: var(--color-text-secondary); }
.text-muted     { color: var(--color-text-muted); }
.text-inverse   { color: var(--color-text-inverse); }

/* ============================================================
   ANIMAZIONI DI SCROLL — reveal on scroll
   Classe aggiunta via JS con IntersectionObserver
============================================================ */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* Ritardo a cascata per elementi figli */
.reveal-stagger > * {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.reveal-stagger.is-visible > *:nth-child(1) { transition-delay: 0ms;   opacity: 1; transform: none; }
.reveal-stagger.is-visible > *:nth-child(2) { transition-delay: 80ms;  opacity: 1; transform: none; }
.reveal-stagger.is-visible > *:nth-child(3) { transition-delay: 160ms; opacity: 1; transform: none; }
.reveal-stagger.is-visible > *:nth-child(4) { transition-delay: 240ms; opacity: 1; transform: none; }
.reveal-stagger.is-visible > *:nth-child(5) { transition-delay: 320ms; opacity: 1; transform: none; }
.reveal-stagger.is-visible > *:nth-child(6) { transition-delay: 400ms; opacity: 1; transform: none; }

/* ============================================================
   ACCESSIBILITÀ — riduzione movimento
============================================================ */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }

  html { scroll-behavior: auto; }

  .reveal,
  .reveal-stagger > * {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* ============================================================
   RESPONSIVE — tipografia scalata
============================================================ */
@media (max-width: 768px) {
  :root {
    --text-4xl: 2rem;      /* Titoli sezione più piccoli su mobile */
    --text-5xl: 2.5rem;
    --text-6xl: 3rem;
    --section-padding-y: var(--space-16);
  }
}