/* ============================================
   LAYOUT — struttura, griglie, contenitori
   ============================================ */

html {
  overflow-x: hidden;
}

body {
  font-family: var(--font-main);
  font-size: var(--fs-base);
  color: var(--color-text);
  background: var(--color-surface);
  overflow-x: hidden;
}

.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding-left: var(--gutter);
  padding-right: var(--gutter);
}

.container--narrow {
  max-width: var(--container-narrow);
}

main {
  display: block;
}

section {
  padding: var(--space-xl) 0;
}

.section--tight {
  padding: var(--space-lg) 0;
}

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

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

/* ---- Header ---- */
.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  background: rgba(248, 245, 237, 0.88);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--color-border);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  padding-top: var(--space-xs);
  padding-bottom: var(--space-xs);
}

/* ---- Grid helpers ---- */
.grid {
  display: grid;
  gap: var(--space-md);
}

.grid--2 {
  grid-template-columns: repeat(2, 1fr);
}

.grid--3 {
  grid-template-columns: repeat(3, 1fr);
}

.flow-diagram {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

/* ---- Footer ---- */
.site-footer {
  background: var(--color-bg-graphite);
  color: var(--color-muted-inverse);
  padding: var(--space-xl) 0 var(--space-md);
  position: relative;
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-accent) 45%, transparent 90%);
  opacity: 0.55;
}

.site-footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: var(--space-lg);
  padding-bottom: var(--space-lg);
  border-bottom: 1px solid var(--color-border-dark);
}

.site-footer__bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: var(--space-md);
  flex-wrap: wrap;
  gap: var(--space-xs);
  font-size: var(--fs-xs);
}

/* ---- Responsive ---- */
@media (max-width: 960px) {
  .grid--3 {
    grid-template-columns: 1fr 1fr;
  }
  .site-footer__grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 680px) {
  :root {
    --gutter: 1.25rem;
  }
  section {
    padding: var(--space-lg) 0;
  }
  .grid--2,
  .grid--3 {
    grid-template-columns: 1fr;
  }
  .site-footer__grid {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }
  .flow-diagram {
    flex-direction: column;
  }
}