:root{
  --bg: #f5f5f7;
  --card: #ffffff;
  --text: #1d1d1f;
  --muted: #6e6e73;
  --hairline: rgba(0,0,0,.08);
  --shadow: 0 8px 30px rgba(0,0,0,.08);
  --radius: 16px;

  --headerH: 84px;
  --footerH: 84px;

  --pad: clamp(14px, 2vw, 22px);
  --max: 980px;
}

*{ box-sizing: border-box; }
html, body{ height: 100%; }
body{
  margin:0;
  color: var(--text);
  background: var(--bg);
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, Helvetica, Arial, "Apple Color Emoji","Segoe UI Emoji";
}

a{ color: inherit; text-decoration: none; }
a:hover{ text-decoration: underline; }

.za-app{
  min-height: 100vh;
  padding-top: var(--headerH);
  padding-bottom: var(--footerH);
}

.za-header, .za-footer{
  position: fixed;
  left:0; right:0;
  z-index: 50;
  background: rgba(245,245,247,.86);
  backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--hairline);
}

.za-header{ top:0; height: var(--headerH); }
.za-footer{
  bottom:0;
  height: var(--footerH);
  border-bottom: 0;
  border-top: 1px solid var(--hairline);
}

.za-header-inner, .za-footer-inner{
  max-width: var(--max);
  margin: 0 auto;
  height: 100%;
  padding: 0 var(--pad);
  display:flex;
  align-items:center;
}

.za-hgrid{
  width: 100%;
  display:grid;
  grid-template-columns: auto 1fr 1fr auto;
  gap: 14px;
  align-items:center;
}

.za-logo img{ border-radius: 12px; display:block; }

.za-company-name{
  font-weight: 600;
  letter-spacing: -0.01em;
  font-size: 15px;
}
.za-company-claim{
  margin-top: 2px;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.2;
}

.za-rotator{
  display:flex;
  justify-content:flex-start;
  align-items:center;
  min-height: 24px;
  overflow:hidden;
  white-space: nowrap;
}
.za-rotator-link{
  color: var(--text);
  font-size: 14px;
  letter-spacing: -0.01em;
}
.za-rotator-link:hover{ opacity: .85; }

.za-lang ul{ list-style:none; margin:0; padding:0; display:flex; gap:10px; }
.za-lang li{ margin:0; padding:0; }
.za-lang a{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding: 8px 10px;
  border-radius: 999px;
  border: 1px solid var(--hairline);
  background: rgba(255,255,255,.7);
  font-size: 13px;
  color: var(--text);
}
.za-lang .current-lang a{
  border-color: rgba(0,0,0,.18);
  background: #fff;
}

.za-content{
  max-width: var(--max);
  margin: 0 auto;
  padding: calc(var(--pad) + 10px) var(--pad) calc(var(--pad) + 10px);
}

.za-tree{
  display:flex;
  flex-direction: column;
  gap: 12px;
}

.za-card{
  background: var(--card);
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.za-trigger{
  width: 100%;
  border: 0;
  background: transparent;
  text-align:left;
  padding: 0;
  cursor:pointer;
  color: var(--text);
}

.za-trigger:focus-visible{
  outline: 3px solid rgba(0, 102, 204, .35);
  outline-offset: 2px;
  border-radius: var(--radius);
}

.za-trigger-grid{
  display:grid;
  grid-template-columns: 64px 1fr 28px;
  gap: 12px;
  align-items:center;
  padding: 14px 16px;
}

.za-icon img{
  width: 44px;
  height: 44px;
  border-radius: 12px;
  display:block;
  background: #fff;
}
.za-icon-placeholder{
  width: 44px; height:44px;
  border-radius: 12px;
  display:block;
  background: linear-gradient(135deg, rgba(0,0,0,.06), rgba(0,0,0,.02));
}

.za-title{
  display:block;
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: 1.25;
  font-size: 15px;
}
.za-sub{
  display:block;
  margin-top: 2px;
  font-size: 13px;
  color: var(--muted);
  line-height: 1.25;
}

.za-chevron{
  display:flex;
  justify-content:center;
  align-items:center;
  color: rgba(0,0,0,.55);
  transition: transform .22s ease;
}
.za-trigger.is-open .za-chevron{
  transform: rotate(180deg);
}

.za-panel{
  border-top: 1px solid var(--hairline);
  overflow: hidden;
  transition: height .26s ease;
}
.za-panel:focus{ outline: none; }

.za-panel-inner{
  padding: 14px 16px 16px;
}

.za-children{
  margin-top: 12px;
  display:flex;
  flex-direction: column;
  gap: 10px;
}

/* Footer */
.za-footer-inner{
  flex-direction: column;
  align-items: stretch;
  justify-content:center;
  gap: 8px;
}
.za-breadcrumb{
  font-size: 13px;
  color: var(--muted);
  overflow:hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.za-copyright{
  font-size: 12px;
  color: var(--muted);
}

/* ---- Differenziazione tipo panel vs qa ---- */
.za-card--panel .za-title{ font-size: 15px; }
.za-card--panel .za-sub{ display:block; }

.za-q{
  display:block;
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: 1.25;
  font-size: 15px;
}
.za-qhint{
  display:block;
  margin-top: 4px;
  font-size: 12px;
  color: var(--muted);
  line-height: 1.2;
}

/* QA: pannello con “answer card” delicata */
.za-panel--qa{
  background: linear-gradient(180deg, rgba(0,0,0,.012), rgba(0,0,0,0));
}
.za-panel-inner--qa{
  padding: 12px 16px 16px;
}

.za-answer-wrap{
  border: 1px solid var(--hairline);
  background: rgba(255,255,255,.72);
  border-radius: 14px;
  padding: 12px 12px;
  box-shadow: 0 4px 18px rgba(0,0,0,.05);
}

.za-answer{
  font-size: 14px;
  line-height: 1.55;
  color: var(--text);
}

/* Micro-interazione: hint scompare quando open */
.za-trigger.is-open .za-qhint{
  opacity: 0;
  height: 0;
  margin-top: 0;
  overflow: hidden;
  transition: opacity .18s ease;
}

/* Panel: children leggermente “indentati” per gerarchia */
.za-panel-inner--panel .za-children{
  margin-top: 10px;
  padding-left: 6px;
  border-left: 1px solid rgba(0,0,0,.06);
}

/* Mobile */
@media (max-width: 760px){
  :root{
    --headerH: 104px;
    --footerH: 92px;
  }

  .za-hgrid{
    grid-template-columns: 52px 1fr;
    grid-template-rows: auto auto;
    gap: 10px;
  }

  .za-hcol-1{ grid-column: 1; grid-row: 1; }
  .za-hcol-2{ grid-column: 2; grid-row: 1; }
  .za-hcol-3{ grid-column: 1 / -1; grid-row: 2; }
  .za-hcol-4{
    position: absolute;
    top: 10px;
    right: var(--pad);
  }

  .za-trigger-grid{
    grid-template-columns: 54px 1fr 24px;
    padding: 12px 14px;
  }

  .za-icon img, .za-icon-placeholder{
    width: 40px; height: 40px;
  }

  .za-qhint{ font-size: 11px; }
  .za-answer-wrap{ padding: 10px; }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce){
  .za-panel{ transition: none; }
  .za-chevron{ transition: none; }
}