/* ═══════════════════════════════════════════════════════════════════
   SEZIONE 4 — "Come si misura un terremoto"
   CSS scoped: prefissi #s-section4, #s4-*, .s4-*
   NON ridefinisce :root — usa variabili del padre
   ═══════════════════════════════════════════════════════════════════ */

/* ── Contenitore sezione ── */
#s-section4 {
  width: 100%;
  height: 100vh;
  overflow: hidden;
  position: relative;
  background: var(--black);
  scroll-snap-align: start;
  scroll-snap-stop: always;
}

/* ── Wrapper interno ── */
#s4-wrap {
  position: relative;
  width: 100%;
  height: 100vh;
  overflow: hidden;
}

/* ── Track orizzontale (13 slide) ── */
#s4-track {
  display: flex;
  flex-direction: row;
  flex-wrap: nowrap;
  width: calc(13 * 100vw);
  height: 100%;
  transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
  will-change: transform;
}

/* ── Singola slide ── */
.s4-slide {
  min-width: 100vw;
  width: 100vw;
  height: 100vh;
  flex-shrink: 0;
  overflow: hidden;
  position: relative;
  background: var(--black);
  box-sizing: border-box;
}

/* ═══════════════════════════════════════════════════════════════════
   NAVIGAZIONE — frecce, dots, counter
   ═══════════════════════════════════════════════════════════════════ */

/* Frecce prev/next — visibili solo al hover del wrapper */
#s4-prev,
#s4-next {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: 20;
  width: 44px;
  height: 44px;
  background: rgba(8, 8, 8, 0.7);
  border: 1px solid rgba(245, 237, 224, 0.1);
  color: rgba(245, 237, 224, 0.8);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 1rem;
  opacity: 0;
  transition: border-color 0.25s, background 0.25s, color 0.25s, opacity 0.25s;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

#s4-prev { left: 0.8rem; }
#s4-next { right: 0.8rem; }

#s4-wrap:hover #s4-prev,
#s4-wrap:hover #s4-next { opacity: 1; }

#s4-prev:hover,
#s4-next:hover {
  border-color: var(--terracotta);
  background: rgba(196, 97, 42, 0.18);
  color: var(--terracotta);
}

#s4-prev[disabled],
#s4-next[disabled] { opacity: 0 !important; pointer-events: none; }

/* Barra nav bottom (pattern identico a s1-nav / s3-nav) */
.s4-nav {
  position: absolute;
  bottom: 1.6rem;
  left: 50%;
  transform: translateX(-50%);
  z-index: 20;
  display: flex;
  align-items: center;
  gap: 1.4rem;
}

/* Dots row — inline flex dentro .s4-nav */
#s4-dots {
  display: flex;
  gap: 0.55rem;
  align-items: center;
}

/* Singolo dot */
.s4-dot {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: rgba(196, 97, 42, 0.2);
  cursor: pointer;
  transition: all 0.35s ease;
}

.s4-dot:hover { background: rgba(245, 237, 224, 0.5); }

/* Dot attivo */
.s4-dot.s4-active {
  background: var(--terracotta);
  transform: scale(1.9);
}

/* Counter inline con i dots */
#s4-counter {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.56rem;
  letter-spacing: 0.28em;
  color: rgba(245, 237, 224, 0.2);
  text-transform: uppercase;
  white-space: nowrap;
}

/* ═══════════════════════════════════════════════════════════════════
   STILI TIPOGRAFICI CONDIVISI
   ═══════════════════════════════════════════════════════════════════ */

/* Eyebrow */
.s4-eyebrow {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.62rem;
  letter-spacing: 0.35em;
  text-transform: uppercase;
  color: var(--terracotta);
  opacity: 0.85;
  margin-bottom: 0.6rem;
}

/* Titolo slide */
.s4-title {
  font-family: 'Cormorant Garamond', serif;
  font-size: clamp(2rem, 3.5vw, 4rem);
  font-weight: 300;
  color: var(--cream);
  line-height: 1.15;
  margin-bottom: 0.8rem;
}

/* Testo corpo */
.s4-body {
  font-family: 'Cormorant Garamond', serif;
  font-size: clamp(0.9rem, 1.4vw, 1.1rem);
  color: var(--cream);
  opacity: 0.85;
  line-height: 1.65;
}

/* Label mono piccola */
.s4-label-mono {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7rem;
  color: var(--cream);
  opacity: 0.6;
  letter-spacing: 0.05em;
}

/* ═══════════════════════════════════════════════════════════════════
   CANVAS — default
   ═══════════════════════════════════════════════════════════════════ */

#s-section4 canvas {
  display: block;
  width: 100%;
  background: #050505;
}

/* ═══════════════════════════════════════════════════════════════════
   PULSANTE PRIMARIO
   ═══════════════════════════════════════════════════════════════════ */

.s4-btn-primary {
  background: var(--terracotta);
  color: var(--black);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.5rem 1.2rem;
  border: none;
  cursor: pointer;
  border-radius: 2px;
  transition: opacity 0.2s;
}

.s4-btn-primary:hover {
  opacity: 0.85;
}

/* ═══════════════════════════════════════════════════════════════════
   SLIDER RANGE — stile globale sezione 4
   ═══════════════════════════════════════════════════════════════════ */

#s-section4 input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 3px;
  background: rgba(245,237,224,0.35);
  border-radius: 2px;
  outline: none;
  cursor: pointer;
}

#s-section4 input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--cream);
  border: 2px solid var(--terracotta);
  cursor: pointer;
  transition: transform 0.15s, background 0.15s;
}

#s-section4 input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.3);
  background: #fff;
}

#s-section4 input[type="range"]::-moz-range-thumb {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--cream);
  border: 2px solid var(--terracotta);
  cursor: pointer;
}

/* ═══════════════════════════════════════════════════════════════════
   ANIMAZIONI KEYFRAMES
   ═══════════════════════════════════════════════════════════════════ */

@keyframes s4-pulse {
  0%   { opacity: 1;   transform: scale(1); }
  50%  { opacity: 0.4; transform: scale(0.75); }
  100% { opacity: 1;   transform: scale(1); }
}

@keyframes s4-bounce {
  0%, 100% { transform: translateY(0); }
  50%       { transform: translateY(14px); }
}

@keyframes s4-fade-in {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes s4-event-flash {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0.3; }
}

/* ═══════════════════════════════════════════════════════════════════
   SLIDE 1 — SISMOGRAFO LIVE
   ═══════════════════════════════════════════════════════════════════ */

#s4-s1 {
  display: flex;
  flex-direction: column;
}

#s4-s1-inner {
  display: flex;
  flex-direction: row;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100%;
  padding: 1.5rem;
  box-sizing: border-box;
  gap: 1.5rem;
}

#s4-s1-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-width: 0;
}

/* Header sezione sismografo */
#s4-s1-header {
  grid-column: 1 / 3;
  padding-bottom: 1rem;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

/* Canvas sismografo */
#s4-seismo-canvas {
  display: block;
  width: 100%;
  height: 320px;
  background: #050505;
  cursor: crosshair;
  border: 1px solid rgba(245, 237, 224, 0.06);
}

/* Pannello laterale info */
#s4-side-info {
  background: var(--charcoal);
  padding: 1rem 0.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  border-left: 1px solid rgba(245, 237, 224, 0.08);
  overflow-y: auto;
  align-self: center;
}

/* Toggle pill modale */
.s4-mode-pill {
  display: flex;
  gap: 0;
  border: 1px solid rgba(245, 237, 224, 0.25);
  border-radius: 4px;
  overflow: hidden;
  width: fit-content;
  margin-bottom: 0.5rem;
}

#s4-mode-live,
#s4-mode-2009 {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.62rem;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  padding: 0.4rem 0.9rem;
  background: rgba(245, 237, 224, 0.04);
  color: rgba(245, 237, 224, 0.35);
  border: none;
  cursor: pointer;
  transition: background 0.25s, color 0.25s, opacity 0.25s;
  opacity: 0.5;
}

/* Separatore visibile tra i due bottoni */
#s4-mode-live {
  border-right: 1px solid rgba(245, 237, 224, 0.2);
}

#s4-mode-live.s4-mode-active,
#s4-mode-2009.s4-mode-active {
  background: rgba(196, 97, 42, 0.18);
  color: var(--cream);
  opacity: 1;
  border-bottom: 2px solid var(--terracotta);
}

/* Bottone inattivo: opaco */
#s4-mode-live:not(.s4-mode-active),
#s4-mode-2009:not(.s4-mode-active) {
  opacity: 0.38;
}

/* Pallino live pulsante */
#s4-live-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #32CD32;
  margin-right: 4px;
  animation: s4DotBlink 1.4s ease-in-out infinite;
}
#s4-live-dot.simulated { background: rgba(245,237,224,0.35); animation: none; }
@keyframes s4DotBlink {
  0%,100% { opacity: 1; }
  50%      { opacity: 0.25; }
}
#s4-2009-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--terracotta, #C4612A);
  margin-right: 4px;
  vertical-align: middle;
}
#s4-iris-status {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.52rem;
  letter-spacing: 0.06em;
  color: var(--terracotta, #C4612A);
  margin-top: 0.4rem;
  display: none;
}
#s4-iris-status.visible { display: block; }

/* Label evento rilevato */
#s4-event-label {
  display: none;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.65rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--terracotta);
  animation: s4-event-flash 0.8s ease-in-out infinite;
}

#s4-event-label.s4-visible {
  display: inline-block;
}

/* Label dati simulati */
#s4-sim-label {
  display: none;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.55rem;
  color: var(--cream);
  opacity: 0.35;
  line-height: 1.4;
}

#s4-sim-label.s4-visible {
  display: block;
}

/* Bottoni velocità */
.s4-speed-btn {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.6rem;
  padding: 0.2rem 0.45rem;
  background: none;
  border: 1px solid rgba(245, 237, 224, 0.2);
  color: rgba(245, 237, 224, 0.5);
  cursor: pointer;
  border-radius: 2px;
  transition: border-color 0.2s, color 0.2s;
}

.s4-speed-btn:hover,
.s4-speed-btn.s4-active {
  border-color: var(--terracotta);
  color: var(--terracotta);
}

/* Riga dati nel pannello info */
.s4-info-row {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
  padding-bottom: 0.45rem;
  border-bottom: 1px solid rgba(245, 237, 224, 0.05);
}

.s4-info-row:last-child {
  border-bottom: none;
}

/* Chiave info */
.s4-info-key {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.55rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ochre);
  opacity: 0.8;
}

/* Valore info */
.s4-info-val {
  font-family: 'Cormorant Garamond', serif;
  font-size: 0.85rem;
  color: var(--cream);
  line-height: 1.3;
}

/* ═══════════════════════════════════════════════════════════════════
   SLIDE 2 — COME FUNZIONA UN SISMOGRAFO
   ═══════════════════════════════════════════════════════════════════ */

#s4-s2-inner {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 2rem;
  padding: 1.5rem 3rem;
  height: 100%;
  box-sizing: border-box;
}

/* Colonna testo sinistra */
.s4-s2-text {
  flex: 0 0 46%;
  align-self: center;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
  overflow-y: auto;
}

/* Colonna animazione destra */
.s4-s2-anim {
  flex: 0 0 46%;
  align-self: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

/* Canvas animazione sismografo */
#s4-anim-canvas {
  display: block;
  width: 100%;
  max-width: 460px;
  height: 380px;
  background: #050505;
  border: 1px solid rgba(245, 237, 224, 0.07);
}

/* Label fase animazione */
#s4-anim-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.65rem;
  letter-spacing: 0.08em;
  color: var(--ochre);
  opacity: 0.8;
  margin-top: 0.5rem;
  text-align: center;
  min-height: 1.2em;
}

/* Pulsante play/pause */
#s4-anim-play {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  padding: 0.4rem 1rem;
  background: none;
  border: 1px solid rgba(245, 237, 224, 0.25);
  color: var(--cream);
  cursor: pointer;
  border-radius: 2px;
  margin-top: 0.5rem;
  transition: border-color 0.2s, color 0.2s;
  align-self: flex-start;
}

#s4-anim-play:hover {
  border-color: var(--terracotta);
  color: var(--terracotta);
}

/* Schema SVG 3 sismografi */
.s4-3seismo-svg {
  width: 100%;
  max-width: 460px;
  margin-top: 0.8rem;
  opacity: 0.75;
}

/* ═══════════════════════════════════════════════════════════════════
   SLIDE 3 — STORIA DEL SISMOGRAFO
   ═══════════════════════════════════════════════════════════════════ */

/* ─── SLIDE 3 — 2000 anni di sismologia ─── */
#s4-s3-inner {
  display: flex;
  flex-direction: column;
  height: 100%;
  padding: 1.2rem 1.2rem 3.8rem 1.2rem;
  box-sizing: border-box;
  gap: 0.55rem;
}

#s4-s3-inner > .s4-eyebrow { text-align: center; flex-shrink: 0; }
#s4-s3-inner > .s4-title {
  text-align: center; flex-shrink: 0;
  font-size: clamp(1.4rem, 2.5vw, 2.2rem);
  margin-bottom: 0.1rem;
}

/* Griglia 3×2 — tutte e 6 le card visibili senza scorrere
   minmax(0, 1fr) è necessario per far funzionare 1fr dentro un flex-item */
#s4-hist-track {
  flex: 1;
  min-height: 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(2, minmax(0, 1fr));
  gap: 0.7rem;
}

/* Card storia */
.s4-hcard {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  background: var(--charcoal);
  border: 1px solid rgba(196, 97, 42, 0.22);
  border-radius: 3px;
  padding: 0.4rem 0.6rem;
  box-sizing: border-box;
  overflow: hidden;
  transition: border-color 0.25s, box-shadow 0.25s;
  cursor: default;
  min-height: 0;
}

.s4-hcard:hover {
  border-color: var(--terracotta);
  box-shadow: 0 4px 16px rgba(196, 97, 42, 0.15);
}

/* Anno */
.s4-hcard-year {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.85rem;
  color: var(--ochre);
  letter-spacing: 0.05em;
  flex-shrink: 0;
}

/* SVG illustrazione */
.s4-hcard-svg {
  width: 100%;
  height: 115px;
  overflow: visible;
  flex-shrink: 0;
}

/* Autore */
.s4-hcard-author {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.62rem;
  color: var(--cream);
  opacity: 0.6;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  flex-shrink: 0;
}

/* Descrizione: overflow nascosto, si adatta all'altezza disponibile */
.s4-hcard-text {
  font-family: 'Cormorant Garamond', serif;
  font-size: 1.08rem;
  color: var(--cream);
  opacity: 0.88;
  line-height: 1.5;
  overflow: hidden;
  flex: 1;
  display: -webkit-box;
  -webkit-line-clamp: 5;
  -webkit-box-orient: vertical;
}

/* ═══════════════════════════════════════════════════════════════════
   SLIDE 4 — LEGGI IL SISMOGRAMMA
   ═══════════════════════════════════════════════════════════════════ */

#s4-s4 {
  display: flex;
  flex-direction: column;
  height: 100%;
  padding: 2.5rem 3rem 3.5rem 3rem;
  box-sizing: border-box;
  gap: 0.9rem;
  justify-content: center;
}

/* Il canvas cresce per occupare tutto lo spazio disponibile */
#s4-read-wrap {
  flex: 1;
  min-height: 0;
  display: flex;
  flex-direction: column;
  gap: 0;
}

/* Canvas sismogramma: flex:1 invece di height fissa */
#s4-read-canvas {
  display: block;
  width: 100%;
  flex: 1;
  min-height: 0;
  background: #050505;
  border: 1px solid rgba(245, 237, 224, 0.06);
  cursor: ew-resize;
}

/* Griglia risultati 3 colonne — altezza fissa, non cresce */
#s4-read-results {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
  flex-shrink: 0;
  height: 6.5rem;
}

/* Colonna risultato */
.s4-res-col {
  background: var(--charcoal);
  border: 1px solid rgba(245, 237, 224, 0.07);
  border-radius: 2px;
  padding: 0.7rem 0.85rem;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  overflow: hidden;
}

.s4-res-col h4 {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.62rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ochre);
  opacity: 0.8;
  margin: 0 0 0.3rem 0;
}

.s4-res-col p {
  font-family: 'Cormorant Garamond', serif;
  font-size: 0.9rem;
  color: var(--cream);
  opacity: 0.85;
  line-height: 1.5;
  margin: 0;
}

.s4-res-col .s4-val-large {
  font-family: 'JetBrains Mono', monospace;
  font-size: 1.2rem;
  color: var(--cream);
  letter-spacing: 0.03em;
}

.s4-res-col .s4-judgment {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7rem;
  color: var(--ochre);
  letter-spacing: 0.05em;
  margin-top: 0.3rem;
}

/* Pulsante verifica */
#s4-verify {
  align-self: flex-start;
  background: var(--terracotta);
  color: var(--black);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.45rem 1rem;
  border: none;
  cursor: pointer;
  border-radius: 2px;
  transition: opacity 0.2s;
  margin-top: 0.2rem;
}

#s4-verify:hover {
  opacity: 0.85;
}

/* Handle marker trascinabile */
.s4-marker-handle {
  position: absolute;
  top: 0;
  width: 0;
  height: 0;
  border-left: 6px solid transparent;
  border-right: 6px solid transparent;
  border-top: 10px solid var(--terracotta);
  cursor: ew-resize;
  transform: translateX(-6px);
  z-index: 5;
}


/* === SLIDE 5 — COME SI CALCOLA LA MAGNITUDO === */

#s4-s5-inner {
  display: grid;
  grid-template-columns: 42% 1fr;
  height: 100%;
  padding: 1.5rem 1.5rem 3.8rem 1.5rem;
  box-sizing: border-box;
  gap: 1.8rem;
  align-items: start;
}

#s4-s5-left {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  overflow: hidden;
  height: 100%;
}

/* Box principio fondamentale */
.s4-s5-key {
  background: rgba(196,97,42,0.06);
  border: 1px solid rgba(196,97,42,0.3);
  border-left: 3px solid var(--terracotta);
  border-radius: 0 3px 3px 0;
  padding: 0.65rem 0.85rem;
}
.s4-s5-key-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.5rem;
  letter-spacing: 0.18em;
  color: var(--terracotta);
  text-transform: uppercase;
  margin-bottom: 0.3rem;
}
.s4-s5-key p {
  font-family: 'Cormorant Garamond', serif;
  font-size: 0.9rem;
  color: var(--cream);
  opacity: 0.85;
  line-height: 1.55;
  margin: 0;
}

/* 3 passi */
.s4-s5-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}
.s4-s5-steps li {
  font-family: 'Cormorant Garamond', serif;
  font-size: 0.88rem;
  color: var(--cream);
  opacity: 0.8;
  line-height: 1.5;
  display: flex;
  gap: 0.5rem;
  align-items: baseline;
}
.s4-s5-stepnum {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.55rem;
  color: var(--ochre);
  flex-shrink: 0;
  padding: 0.1rem 0.35rem;
  border: 1px solid rgba(212,137,58,0.4);
  border-radius: 2px;
}

/* Calcolatore */
#s4-s5-calc {
  background: var(--charcoal);
  border: 1px solid rgba(245,237,224,0.08);
  border-radius: 3px;
  padding: 0.85rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
  margin-top: auto;
}
.s4-s5-calc-title {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.48rem;
  letter-spacing: 0.18em;
  color: var(--ochre);
  text-transform: uppercase;
  opacity: 0.7;
}
/* Riga calcolatore: label | slider | input number | unità | hint */
.s4-calc-row {
  display: grid;
  grid-template-columns: 4.2rem 1fr 4.5rem auto auto;
  align-items: center;
  gap: 0.45rem;
}
.s4-calc-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.58rem;
  color: var(--cream);
  opacity: 0.6;
  white-space: nowrap;
}
/* Slider nel calcolatore */
.s4-calc-slider {
  width: 100%;
}
.s4-calc-input {
  background: rgba(8,8,8,0.8);
  border: 1px solid rgba(245,237,224,0.2);
  color: var(--cream);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.78rem;
  padding: 0.25rem 0.4rem;
  border-radius: 2px;
  outline: none;
  width: 100%;
  box-sizing: border-box;
  text-align: right;
}
.s4-calc-input:focus { border-color: var(--terracotta); }
.s4-calc-unit {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.55rem;
  color: var(--cream);
  opacity: 0.4;
}
.s4-calc-hint {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.52rem;
  color: var(--ochre);
  opacity: 0.6;
  white-space: nowrap;
  grid-column: 2 / 6;
  padding-left: 0.1rem;
}

/* Display ML */
#s4-ml-display {
  display: flex;
  align-items: baseline;
  gap: 0.3rem;
  padding: 0.4rem 0;
}
.s4-ml-eq {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  color: var(--cream);
  opacity: 0.5;
}
#s4-ml-number {
  font-family: 'Cormorant Garamond', serif;
  font-size: clamp(2rem, 3.5vw, 3rem);
  font-weight: 300;
  color: var(--terracotta);
  line-height: 1;
}

/* Colonna destra: canvas nomogramma */
#s4-s5-right {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  height: 100%;
  overflow: hidden;
}
.s4-s5-nomo-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.52rem;
  letter-spacing: 0.2em;
  color: var(--cream);
  opacity: 0.3;
  text-transform: uppercase;
  flex-shrink: 0;
}
#s4-nomo-canvas {
  display: block;
  width: 100%;
  flex: 1;
  min-height: 0;
  background: #050505;
  border: 1px solid rgba(245,237,224,0.07);
}
.s4-s5-nomo-caption {
  font-family: 'Cormorant Garamond', serif;
  font-size: 0.72rem;
  color: var(--cream);
  opacity: 0.4;
  text-align: center;
  line-height: 1.4;
  flex-shrink: 0;
}


/* === SLIDE 6 — CALCOLO RICHTER LIVE INGV === */

#s4-s6-inner {
  display: flex;
  flex-direction: column;
  justify-content: center;
  height: 100%;
  padding: 1.3rem 2rem 3.5rem 2rem;
  box-sizing: border-box;
  gap: 0.9rem;
}

#s4-s6-header { flex-shrink: 0; }

#s4-s6-intro {
  font-family: 'Cormorant Garamond', serif;
  font-size: clamp(0.85rem, 1.2vw, 1rem);
  color: var(--cream);
  opacity: 0.7;
  line-height: 1.55;
  margin: 0.3rem 0 0;
}

/* Layout 2 colonne */
#s4-s6-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  flex-shrink: 0;
  max-height: 65vh;
}

/* Pipeline sinistra */
#s4-s6-pipeline {
  display: flex;
  flex-direction: column;
  gap: 0;
  overflow: hidden;
}

.s4-pipe-step {
  background: var(--charcoal);
  border: 1px solid rgba(245,237,224,0.06);
  border-radius: 3px;
  padding: 0.5rem 0.8rem;
  display: flex;
  gap: 0.6rem;
  align-items: flex-start;
  opacity: 0;
  transform: translateX(-12px);
  transition: opacity 0.4s ease, transform 0.4s ease, border-color 0.3s;
  flex-shrink: 0;
}

.s4-pipe-step.s4-visible {
  opacity: 1;
  transform: translateX(0);
  border-color: rgba(196,97,42,0.22);
}

/* Override: step 1 visibile subito */
#s4-step1 { opacity: 1; transform: none; border-color: rgba(196,97,42,0.22); }

.s4-pipe-num {
  font-family: 'JetBrains Mono', monospace;
  font-size: 1.1rem;
  font-weight: 400;
  color: var(--terracotta);
  opacity: 0.5;
  flex-shrink: 0;
  line-height: 1;
  padding-top: 0.1rem;
}

.s4-pipe-body {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  min-width: 0;
}

.s4-pipe-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.55rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ochre);
  opacity: 0.8;
}

.s4-pipe-data {
  font-family: 'Cormorant Garamond', serif;
  font-size: 0.9rem;
  color: var(--cream);
  opacity: 0.85;
  line-height: 1.5;
}

.s4-pipe-connector {
  font-size: 0.9rem;
  color: var(--terracotta);
  opacity: 0.35;
  text-align: left;
  padding: 0.1rem 0 0.1rem 1.4rem;
  flex-shrink: 0;
}

/* Pannello destra: formula + risultato */
#s4-s6-result {
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
  overflow: hidden;
}

.s4-s6-formula-block {
  background: rgba(8,8,8,0.7);
  border: 1px solid rgba(196,97,42,0.25);
  border-radius: 3px;
  padding: 1.1rem;
}

.s4-formula-box-lg {
  font-family: 'JetBrains Mono', monospace;
  font-size: clamp(0.75rem, 1.2vw, 0.95rem);
  color: var(--cream);
  opacity: 0.9;
  text-align: center;
  padding: 0.5rem 0;
}

.s4-s6-formula-vars {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.58rem;
  color: var(--cream);
  opacity: 0.45;
  line-height: 1.8;
  margin-top: 0.5rem;
}

#s4-s6-result-display {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  align-items: center;
  justify-content: center;
  max-height: 160px;
  background: var(--charcoal);
  border: 1px solid rgba(245,237,224,0.07);
  border-radius: 3px;
  padding: 1rem;
}

.s4-s6-res-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.52rem;
  letter-spacing: 0.2em;
  color: var(--cream);
  opacity: 0.35;
  text-transform: uppercase;
}

#s4-ml-big {
  font-family: 'Cormorant Garamond', serif;
  font-size: clamp(2.4rem, 5vw, 3.8rem);
  font-weight: 300;
  color: var(--terracotta);
  line-height: 1;
  transition: opacity 0.3s;
}

#s4-ml-compare-note {
  font-family: 'Cormorant Garamond', serif;
  font-size: 0.85rem;
  color: var(--cream);
  opacity: 0.55;
  text-align: center;
  line-height: 1.4;
}

.s4-step-note {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.5rem;
  color: var(--cream);
  opacity: 0.3;
  line-height: 1.5;
  margin-top: 0.15rem;
}


/* === SLIDE 7 — SCALA MCS: 3 COLONNE === */

#s4-s7-inner {
  display: grid;
  grid-template-columns: 18% 50% 32%;
  height: 100%;
  padding: 0;
  box-sizing: border-box;
  gap: 0;
}

/* Colonna 1: scala verticale I–XII */
#s4-s7-scale {
  display: flex;
  flex-direction: column;
  height: 100%;
  padding: 1.5rem 0.8rem 3.8rem;
  box-sizing: border-box;
  border-right: 1px solid rgba(245,237,224,0.06);
}

/* Colonna 2: numero romano + descrizione + illustrazione */
#s4-s7-center {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 1rem;
  padding: 2rem 2.5rem 3.8rem;
  box-sizing: border-box;
  border-right: 1px solid rgba(245,237,224,0.06);
  overflow: hidden;
}

/* Colonna 3: eyebrow + titolo + storia */
#s4-s7-right {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 1.2rem;
  padding: 2rem 2.5rem 3.8rem 2rem;
  box-sizing: border-box;
  overflow-y: auto;
}

/* Box storia MCS con bordo */
#s4-s7-history {
  background: rgba(245, 237, 224, 0.03);
  border: 1px solid rgba(245, 237, 224, 0.08);
  border-radius: 3px;
  padding: 0.65rem 0.8rem;
  flex-shrink: 0;
}
#s4-s7-history p {
  font-family: 'Cormorant Garamond', serif;
  font-size: clamp(0.78rem, 1vw, 0.9rem);
  color: var(--cream);
  opacity: 0.65;
  line-height: 1.6;
  margin: 0 0 0.35rem;
}
#s4-s7-history p:last-child { margin-bottom: 0; }

/* Scala verticale: 12 blocchi */
#s4-mcs-scale-col {
  flex: 1;
  min-height: 0;
  display: flex;
  flex-direction: column;
  gap: 0.18rem;
}

.s4-mcs-bar-item {
  flex: 1;
  min-height: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  border: 1px solid transparent;
  border-radius: 2px;
  transition: opacity 0.2s, transform 0.15s;
  background: rgba(245,237,224,0.04);
}

.s4-mcs-bar-item:hover { opacity: 0.85; }

.s4-mcs-bar-item.s4-active {
  transform: translateX(3px);
}

.s4-bar-roman {
  font-family: 'Cormorant Garamond', serif;
  font-size: clamp(0.6rem, 1vw, 0.78rem);
  color: rgba(245,237,224,0.4);
  font-weight: 600;
  transition: color 0.2s;
}

.s4-mcs-bar-item.s4-active .s4-bar-roman {
  color: var(--black);
  font-weight: 700;
}

/* Frecce di navigazione MCS */
.s4-mcs-arrows {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  margin-top: 0.5rem;
}
.s4-mcs-arrow-btn {
  background: rgba(196,97,42,0.12);
  border: 1px solid rgba(196,97,42,0.35);
  color: var(--terracotta);
  font-size: 0.75rem;
  padding: 0.3rem 0.5rem;
  cursor: pointer;
  transition: background 0.2s;
  border-radius: 2px;
  line-height: 1;
}
.s4-mcs-arrow-btn:hover { background: rgba(196,97,42,0.25); }

/* Screen-reader only */
.s4-sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  border: 0;
}

#s4-mcs-roman {
  font-family: 'Cormorant Garamond', serif;
  font-size: clamp(6rem, 12vw, 10rem);
  font-weight: 300;
  line-height: 1;
  transition: color 0.35s;
  flex-shrink: 0;
}

#s4-mcs-text {
  font-family: 'Cormorant Garamond', serif;
  font-size: clamp(1rem, 1.5vw, 1.2rem);
  color: var(--cream);
  opacity: 0.9;
  line-height: 1.7;
  transition: opacity 0.3s;
  flex-shrink: 0;
}

#s4-mcs-illus {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  overflow: hidden;
  flex-shrink: 0;
}

#s4-mcs-illus svg { transition: opacity 0.3s; }

#s4-mcs-compare {
  background: rgba(139,26,26,0.08);
  border: 1px solid rgba(139,26,26,0.4);
  border-radius: 3px;
  padding: 0.65rem 0.9rem;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  flex-shrink: 0;
}

/* ═══════════════════════════════════════════════════════════════════
   SLIDE 8 — RICHTER VS MCS
   ═══════════════════════════════════════════════════════════════════ */

/* ─── SLIDE 8 — Richter vs MCS ─── */
#s4-s8-inner {
  display: flex;
  flex-direction: column;
  justify-content: center;
  height: 100%;
  padding: 1.2rem 2rem 3.5rem 2rem;
  box-sizing: border-box;
  gap: 0.6rem;
}

#s4-s8-inner > .s4-eyebrow { flex-shrink: 0; }
#s4-s8-inner > .s4-title   { flex-shrink: 0; text-align: center; margin-bottom: 0; }

/* Layout comparativo: 2 colonne + separatore */
.s4-s8-cols {
  display: grid;
  grid-template-columns: 1fr 40px 1fr;
  gap: 0.8rem;
  flex: 1;
  min-height: 0;
}

/* Colonna confronto */
.s4-compare-col {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
  padding: 0.75rem 0.9rem;
  overflow: hidden;
}

.s4-col-richter {
  border: 1px solid rgba(196, 97, 42, 0.3);
  background: rgba(196, 97, 42, 0.04);
  border-radius: 3px 0 0 3px;
}

.s4-col-mcs {
  border: 1px solid rgba(58, 126, 196, 0.3);
  background: rgba(58, 126, 196, 0.04);
  border-radius: 0 3px 3px 0;
}

/* Header colonna */
.s4-col-header {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.65rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 0.4rem 0.6rem;
  border-radius: 2px;
  margin-bottom: 0.2rem;
  flex-shrink: 0;
}

.s4-col-richter .s4-col-header {
  background: rgba(196, 97, 42, 0.12);
  color: var(--terracotta);
  border: 1px solid rgba(196, 97, 42, 0.35);
}

.s4-col-mcs .s4-col-header {
  background: rgba(58, 126, 196, 0.12);
  color: var(--blue);
  border: 1px solid rgba(58, 126, 196, 0.35);
}

/* Riga testo confronto (senza emoji) */
.s4-compare-row {
  display: grid;
  grid-template-columns: 3.5rem 1fr;
  gap: 0.4rem;
  align-items: baseline;
  font-family: 'Cormorant Garamond', serif;
  font-size: 0.85rem;
  padding: 0.18rem 0;
  color: var(--cream);
  opacity: 0.85;
  line-height: 1.4;
}

.s4-compare-row strong {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.55rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ochre);
  opacity: 0.75;
  font-weight: 400;
  display: block;
  line-height: 1.8;
}

/* Box formula in colonna */
.s4-formula-box {
  background: rgba(8, 8, 8, 0.85);
  border: 1px solid rgba(245, 237, 224, 0.1);
  border-radius: 2px;
  padding: 0.55rem 0.7rem;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.68rem;
  color: var(--cream);
  opacity: 0.85;
  text-align: center;
  flex-shrink: 0;
}

.s4-formula-sub {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.52rem;
  color: var(--cream);
  opacity: 0.45;
  display: block;
  margin-top: 0.25rem;
}

/* Esempio in colonna */
.s4-col-example {
  font-family: 'Cormorant Garamond', serif;
  font-size: 0.85rem;
  color: var(--cream);
  opacity: 0.6;
  font-style: italic;
  line-height: 1.4;
  margin-top: auto;
}

/* Separatore centrale */
.s4-s8-sep {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.5rem 0;
}

.s4-s8-sep::before,
.s4-s8-sep::after {
  content: '';
  flex: 1;
  width: 1px;
  border-left: 1px dashed rgba(245, 237, 224, 0.18);
}

.s4-sep-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.5rem;
  letter-spacing: 0.07em;
  color: var(--cream);
  opacity: 0.3;
  text-align: center;
  writing-mode: vertical-rl;
  white-space: nowrap;
}

/* Box riassuntivo sotto le colonne */
#s4-s8-summary {
  background: var(--charcoal);
  border: 1px solid rgba(212, 137, 58, 0.35);
  border-radius: 3px;
  padding: 0.75rem 1rem;
  font-family: 'Cormorant Garamond', serif;
  font-size: clamp(0.82rem, 1.1vw, 0.95rem);
  color: var(--cream);
  opacity: 0.85;
  line-height: 1.55;
  flex-shrink: 0;
  text-align: center;
  margin: 0.5rem auto 0;
  max-width: 560px;
}

/* Tabella 2×2 */
.s4-s8-table {
  width: 100%;
  border-collapse: collapse;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.62rem;
  color: var(--cream);
  opacity: 0.72;
  margin: 0.5rem auto;
  min-width: 300px;
}

.s4-s8-table td,
.s4-s8-table th {
  padding: 0.3rem 0.55rem;
  border: 1px solid rgba(245, 237, 224, 0.1);
  text-align: center;
}

.s4-s8-table th {
  color: var(--ochre);
  opacity: 0.8;
  font-weight: 400;
  background: rgba(245, 237, 224, 0.03);
}

/* ═══════════════════════════════════════════════════════════════════
   SLIDE 9 — LOCALIZZAZIONE EPICENTRO
   ═══════════════════════════════════════════════════════════════════ */

#s4-s9-inner {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  padding: 1rem 1.5rem 3.5rem 1.5rem;
  height: 100%;
  box-sizing: border-box;
}

/* Pannello controlli sinistra */
#s4-s9-controls {
  flex: 0 0 28%;
  align-self: flex-start;
  padding-top: 2.5rem;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
  box-sizing: border-box;
  overflow-y: auto;
  background: rgba(16, 16, 16, 0.6);
}

/* Card stazione sismica */
.s4-sta-card {
  background: var(--charcoal);
  border: 1px solid rgba(245, 237, 224, 0.07);
  border-radius: 2px;
  padding: 0.65rem 0.7rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.s4-sta-card .s4-sta-name {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.62rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ochre);
  opacity: 0.85;
}

.s4-sta-card .s4-sta-coords {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.55rem;
  color: var(--cream);
  opacity: 0.4;
}

/* Header stazione con bottone Calcola */
.s4-sta-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.8rem;
}
.s4-sta-coord {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.52rem;
  color: var(--cream);
  opacity: 0.4;
  margin-top: 0.15rem;
}
.s4-tria-calc-btn { min-width: 60px; flex-shrink: 0; }

/* Slider gap P-S stazione */
.s4-sta-slider {
  width: 100%;
  margin: 0.2rem 0;
}

/* Display distanza calcolata */
.s4-sta-dist {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7rem;
  color: var(--cream);
  opacity: 0.7;
}

/* Pulsante calcola epicentro */
#s4-calc-epi {
  background: var(--terracotta);
  color: var(--black);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.5rem 1rem;
  border: none;
  cursor: pointer;
  border-radius: 2px;
  transition: opacity 0.2s;
  width: 100%;
}

#s4-calc-epi:hover { opacity: 0.85; }

/* Pulsante reset */
#s4-reset-epi {
  background: none;
  color: var(--cream);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.62rem;
  letter-spacing: 0.07em;
  padding: 0.4rem 0.8rem;
  border: 1px solid rgba(245, 237, 224, 0.2);
  cursor: pointer;
  border-radius: 2px;
  transition: border-color 0.2s;
  width: 100%;
  opacity: 0.65;
}

#s4-reset-epi:hover {
  border-color: rgba(245, 237, 224, 0.5);
  opacity: 1;
}

/* Toggle stazione 4 */
#s4-sta4-toggle {
  background: none;
  color: var(--blue);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.6rem;
  letter-spacing: 0.07em;
  padding: 0.35rem 0.7rem;
  border: 1px solid rgba(58, 126, 196, 0.35);
  cursor: pointer;
  border-radius: 2px;
  transition: background 0.2s;
  width: 100%;
}

#s4-sta4-toggle:hover {
  background: rgba(58, 126, 196, 0.1);
}

/* Div mappa Leaflet slide 9 */
#s4-map9 {
  flex: 1;
  max-width: 70%;
  height: calc(100vh - 2rem);
  max-height: 80vh;
}

/* Risultato epicentro */
#s4-epi-result {
  position: absolute;
  bottom: 3.5rem;
  right: 0;
  width: 65%;
  padding: 0.5rem 1rem;
  background: rgba(8, 8, 8, 0.85);
  border-top: 1px solid rgba(245, 237, 224, 0.08);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.6rem;
  color: var(--cream);
  opacity: 0.75;
  letter-spacing: 0.05em;
  line-height: 1.7;
  z-index: 10;
}

/* Box formula slide 9 */
.s4-formula-box-dark {
  background: rgba(8, 8, 8, 0.9);
  border: 1px solid rgba(245, 237, 224, 0.1);
  border-radius: 2px;
  padding: 0.6rem 0.7rem;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.62rem;
  color: var(--cream);
  opacity: 0.75;
  line-height: 1.5;
}

/* ═══════════════════════════════════════════════════════════════════
   SLIDE 10 — SCALA RICHTER: IL COMPARATORE
   ═══════════════════════════════════════════════════════════════════ */

#s4-s10-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  height: 100%;
  padding: 1.5rem 2.5rem 3.5rem;
  box-sizing: border-box;
  gap: 0.8rem;
  overflow: hidden;
}
.s4-s5-header { text-align: center; flex-shrink: 0; }
.s4-s5-eyebrow { font-family: 'JetBrains Mono', monospace; font-size: 0.65rem; letter-spacing: 0.2em; color: var(--terracotta); text-transform: uppercase; margin-bottom: 0.3rem; }
.s4-s5-title { font-family: 'Cormorant Garamond', serif; font-size: clamp(1.4rem, 2.5vw, 2rem); font-weight: 600; color: var(--cream); margin: 0; line-height: 1.2; }
.s4-s5-top { display: grid; grid-template-columns: 35% 12% 53%; gap: 0.5rem; width: 100%; flex: 1; min-height: 0; align-items: center; }
.s4-svgzone { display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 0.5rem; height: 100%; }
#s4-svgbox { width: 100%; height: 160px; display: flex; align-items: center; justify-content: center; }
#s4-svgbox svg { transition: opacity 0.3s ease; max-width: 140px; max-height: 150px; }
#s4-svglabel { font-family: 'JetBrains Mono', monospace; font-size: 0.65rem; color: var(--ochre); text-align: center; letter-spacing: 0.05em; min-height: 2em; line-height: 1.4; }
.s4-barzone { display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 0.3rem; height: 100%; }
.s4-barlabel-top { font-family: 'JetBrains Mono', monospace; font-size: 0.55rem; color: var(--blood); letter-spacing: 0.05em; text-transform: uppercase; text-align: center; }
.s4-barlabel-bot { font-family: 'JetBrains Mono', monospace; font-size: 0.55rem; color: #4CAF50; letter-spacing: 0.05em; text-align: center; }
#s4-energy-bar { display: block; border-radius: 2px; }
.s4-datazone { display: flex; flex-direction: column; justify-content: center; gap: 0.6rem; padding-left: 1rem; height: 100%; }
.s4-datazone-heading { font-family: 'JetBrains Mono', monospace; font-size: 0.6rem; letter-spacing: 0.15em; color: var(--terracotta); text-transform: uppercase; }
#s4-joule-display { font-family: 'JetBrains Mono', monospace; font-size: clamp(1.1rem, 2.2vw, 1.6rem); color: var(--cream); letter-spacing: 0.02em; line-height: 1; }
#s4-compare { font-family: 'Cormorant Garamond', serif; font-size: clamp(0.9rem, 1.5vw, 1.2rem); color: var(--ochre); line-height: 1.3; min-height: 2.5em; }
#s4-freq { font-family: 'JetBrains Mono', monospace; font-size: 0.6rem; color: rgba(245,237,224,0.45); letter-spacing: 0.05em; }
.s4-s5-bottom { display: flex; align-items: center; gap: 1.5rem; width: 100%; flex-shrink: 0; padding: 0.4rem 0; }
#s4-mag-val { font-family: 'JetBrains Mono', monospace; font-size: 1.3rem; color: var(--terracotta); font-weight: 700; flex-shrink: 0; min-width: 4rem; }
.s4-slider-wrap { flex: 1; display: flex; flex-direction: column; gap: 0.4rem; position: relative; }
.s4-slider-marker-wrap { position: relative; width: 100%; }
.s4-laquila-marker { position: absolute; top: -1.6rem; transform: translateX(-50%); pointer-events: none; white-space: nowrap; }
.s4-laquila-marker-label { font-family: 'JetBrains Mono', monospace; font-size: 0.5rem; color: var(--blood); }
#s4-mag-slider { width: 100%; -webkit-appearance: none; appearance: none; height: 4px; background: linear-gradient(to right, var(--terracotta), var(--blood)); border-radius: 2px; outline: none; cursor: pointer; }
#s4-mag-slider::-webkit-slider-thumb { -webkit-appearance: none; width: 18px; height: 18px; background: var(--cream); border-radius: 50%; border: 2px solid var(--terracotta); cursor: pointer; }
.s4-slider-minmax { display: flex; justify-content: space-between; font-family: 'JetBrains Mono', monospace; font-size: 0.5rem; color: rgba(245,237,224,0.35); }

/* Wrapper slider con label M0/M10 */
.s4-richter-slider-wrap {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-shrink: 0;
}

.s4-richter-slider-inner {
  flex: 1;
  position: relative;
}

/* Label estremità slider (M 0, M 10, I, XII) */
.s4-slider-label-sm {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.58rem;
  color: var(--cream);
  opacity: 0.4;
  letter-spacing: 0.05em;
  white-space: nowrap;
}

/* Marker fisso L'Aquila */
.s4-richter-fixed-marker {
  position: absolute;
  top: -1.4rem;
  transform: translateX(-50%);
  pointer-events: none;
}

.s4-richter-marker-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.5rem;
  color: var(--blood);
  letter-spacing: 0.06em;
  white-space: nowrap;
}

/* Nota di riferimento M6.3 */
.s4-richter-ref-note {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.55rem;
  color: var(--blood);
  opacity: 0.65;
  letter-spacing: 0.08em;
  text-align: center;
  flex-shrink: 0;
}

/* Slider magnitudo Richter */
#s4-richter-slider {
  width: 100%;
  flex-shrink: 0;
}

/* Visualizzazione tre zone */
.s4-richter-viz {
  display: grid;
  grid-template-columns: 38% 8% 1fr;
  gap: 1.2rem;
  flex: 1;
  min-height: 0;
  align-items: center;
}

/* Zona illustrazione SVG (con fade) */
#s4-richter-illus {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  min-height: 180px;
  overflow: hidden;
}

#s4-richter-illus svg {
  max-height: 180px;
  width: auto;
  transition: opacity 0.3s ease;
}

/* Wrapper barra energia */
#s4-richter-bar-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  height: 100%;
  justify-content: flex-end;
  gap: 0.5rem;
}

/* Barra energia logaritmica */
#s4-richter-bar {
  width: 28px;
  background: linear-gradient(to top, #4CAF50, #D4893A, var(--blood));
  border-radius: 3px 3px 0 0;
  transition: height 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  min-height: 2px;
  max-height: 200px;
}

/* Zona dati destra */
.s4-richter-data {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  overflow-y: auto;
}

/* Display joule */
#s4-richter-joule {
  font-family: 'JetBrains Mono', monospace;
  font-size: clamp(1rem, 2vw, 1.5rem);
  color: var(--cream);
  letter-spacing: 0.03em;
  line-height: 1.2;
}

/* Confronto con L'Aquila */
#s4-richter-compare {
  font-family: 'Cormorant Garamond', serif;
  font-size: 0.9rem;
  color: var(--cream);
  opacity: 0.8;
  line-height: 1.5;
}

/* Frequenza globale */
#s4-richter-freq {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.62rem;
  color: var(--ochre);
  opacity: 0.7;
  letter-spacing: 0.05em;
  padding-top: 0.5rem;
  border-top: 1px solid rgba(245, 237, 224, 0.08);
}

/* Etichetta "L'Aquila 2009" sul slider */
#s4-s10-inner .s4-aquila-mark {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.58rem;
  color: var(--blood);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  opacity: 0.9;
}

/* ═══════════════════════════════════════════════════════════════════
   SLIDE 11 — SIMULATORE MCS CON CONDIZIONI
   ═══════════════════════════════════════════════════════════════════ */

/* 3 colonne full-height */
#s4-s11-inner {
  display: grid;
  grid-template-columns: 28% 38% 34%;
  height: 100%;
  overflow: hidden;
}

/* Colonna 1: contesto */
#s4-s11-context {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 1.2rem;
  padding: 2.5rem 2rem 3.8rem 2.5rem;
  border-right: 1px solid rgba(245,237,224,0.07);
  box-sizing: border-box;
}
#s4-s11-context .s4-title {
  font-size: clamp(1.8rem, 3vw, 3rem);
  margin: 0;
  line-height: 1.15;
}
#s4-s11-context .s4-body-text-sm { margin: 0; }

/* Etichetta di sezione interna */
.s4-sim-section-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.5rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: rgba(245, 237, 224, 0.3);
  padding-bottom: 0.4rem;
  border-bottom: 1px solid rgba(245, 237, 224, 0.07);
}

/* Pannello controlli (colonna 2) */
#s4-sim-controls {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 0.9rem;
  padding: 2rem 1.5rem 3.8rem 1.5rem;
  box-sizing: border-box;
  overflow-y: auto;
  background: rgba(16, 16, 16, 0.6);
  border-right: 1px solid rgba(245, 237, 224, 0.06);
  scrollbar-width: thin;
  scrollbar-color: rgba(196,97,42,0.4) transparent;
}
#s4-sim-controls::-webkit-scrollbar { width: 3px; }
#s4-sim-controls::-webkit-scrollbar-thumb { background: rgba(196,97,42,0.4); border-radius: 2px; }

/* Riga slider con label */
.s4-sim-row {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.s4-sim-sl-labels {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.52rem;
  letter-spacing: 0.06em;
  color: rgba(245, 237, 224, 0.38);
  text-transform: uppercase;
}

.s4-sl-dash {
  color: rgba(245, 237, 224, 0.18);
  font-size: 0.6rem;
  flex: 1;
  text-align: center;
}

.s4-sim-row label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.6rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ochre);
  opacity: 0.75;
}

.s4-sim-row .s4-sim-val {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.72rem;
  color: var(--cream);
  opacity: 0.8;
}

/* Pulsante simula */
#s4-sim-btn {
  background: var(--terracotta);
  color: var(--black);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.55rem 1rem;
  border: none;
  cursor: pointer;
  border-radius: 2px;
  transition: opacity 0.2s;
  width: 100%;
  margin-top: 0.3rem;
}

#s4-sim-btn:hover { opacity: 0.85; }

/* Pulsanti preset */
.s4-preset-btn {
  background: none;
  color: var(--cream);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.55rem;
  letter-spacing: 0.05em;
  padding: 0.3rem 0.6rem;
  border: 1px solid rgba(245, 237, 224, 0.15);
  cursor: pointer;
  border-radius: 2px;
  transition: border-color 0.2s, background 0.2s;
  text-align: left;
  line-height: 1.5;
  width: 100%;
  opacity: 0.7;
}

.s4-preset-btn:hover {
  border-color: rgba(196, 97, 42, 0.5);
  background: rgba(196, 97, 42, 0.07);
  opacity: 1;
}

/* Zona risultato (colonna 3) */
#s4-sim-output {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1.2rem;
  padding: 2rem 2.5rem 3.8rem;
  box-sizing: border-box;
  overflow-y: auto;
}

/* Grado MCS grande */
#s4-sim-grade {
  font-family: 'Cormorant Garamond', serif;
  font-size: clamp(6rem, 10vw, 8rem);
  font-weight: 300;
  color: var(--terracotta);
  line-height: 1;
  transition: color 0.4s;
}

/* Descrizione effetti simulati */
#s4-sim-desc {
  font-family: 'Cormorant Garamond', serif;
  font-size: clamp(0.9rem, 1.4vw, 1.1rem);
  color: var(--cream);
  opacity: 0.85;
  line-height: 1.6;
  text-align: center;
  max-width: 480px;
}

/* Barra comparativa */
#s4-sim-bar {
  width: 100%;
  max-width: 380px;
  height: 8px;
  background: rgba(245, 237, 224, 0.08);
  border-radius: 4px;
  overflow: hidden;
  position: relative;
}

#s4-sim-bar::after {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  height: 100%;
  background: var(--terracotta);
  border-radius: 4px;
  transition: width 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  width: var(--s4-sim-pct, 50%);
}

/* Percentuale danni */
#s4-sim-pct {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.62rem;
  color: var(--cream);
  opacity: 0.5;
  letter-spacing: 0.08em;
  text-align: center;
}

/* ═══════════════════════════════════════════════════════════════════
   SLIDE 12 — MAPPA ISOSISMICA
   ═══════════════════════════════════════════════════════════════════ */

#s4-s12-inner {
  display: flex;
  flex-direction: column;
  height: 100%;
  padding: 0.5rem 1rem;
  box-sizing: border-box;
  gap: 0.4rem;
}

/* Layout 70/30 dentro s12 */
.s4-s12-layout {
  display: flex;
  gap: 1.2rem;
  height: calc(100% - 4rem);
  padding: 0.5rem 0;
  align-items: stretch;
}

/* Div mappa Leaflet slide 12 */
#s4-map12 {
  flex: 0 0 68%;
  height: 100%;
  min-height: 300px;
}

/* Legenda laterale */
#s4-s12-legend {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  overflow-y: auto;
  min-width: 0;
  padding-right: 0.5rem;
  box-sizing: border-box;
  background: rgba(16, 16, 16, 0.7);
}

#s4-s12-legend .s4-legend-title {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.62rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ochre);
  opacity: 0.7;
  margin-bottom: 0.5rem;
}

/* Riga legenda */
.s4-legend-row {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.s4-legend-row .s4-legend-color {
  width: 18px;
  height: 14px;
  border-radius: 2px;
  flex-shrink: 0;
  opacity: 0.85;
  background: var(--lc, #555);
}

.s4-legend-row .s4-legend-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.58rem;
  color: var(--cream);
  opacity: 0.75;
  letter-spacing: 0.04em;
}

.s4-legend-row .s4-legend-desc {
  font-family: 'Cormorant Garamond', serif;
  font-size: 0.75rem;
  color: var(--cream);
  opacity: 0.6;
  line-height: 1.3;
}

#s4-s12-legend .s4-legend-source {
  margin-top: auto;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.52rem;
  color: var(--cream);
  opacity: 0.3;
  letter-spacing: 0.04em;
  line-height: 1.6;
  padding-top: 0.8rem;
  border-top: 1px solid rgba(245, 237, 224, 0.06);
}

/* Override Leaflet dentro sezione 4 per dark theme */
#s-section4 .leaflet-container {
  background: var(--black);
}

#s-section4 .leaflet-control-zoom a {
  background: var(--charcoal);
  color: var(--cream);
  border-color: rgba(245, 237, 224, 0.15);
}

#s-section4 .leaflet-control-zoom a:hover {
  background: var(--terracotta);
  color: var(--black);
}

#s-section4 .leaflet-popup-content-wrapper {
  background: var(--charcoal);
  color: var(--cream);
  border-radius: 3px;
  font-family: 'Cormorant Garamond', serif;
  border: 1px solid rgba(245, 237, 224, 0.1);
}

#s-section4 .leaflet-popup-tip {
  background: var(--charcoal);
}

/* ═══════════════════════════════════════════════════════════════════
   SLIDE 13 — TRANSIZIONE
   ═══════════════════════════════════════════════════════════════════ */

#s4-s13-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  padding: 2rem;
  box-sizing: border-box;
  gap: 1.2rem;
  text-align: center;
}

#s4-s13-inner .s4-eyebrow {
  margin-bottom: 1rem;
}

#s4-s13-inner .s4-title {
  font-size: clamp(1.5rem, 2.5vw, 2.2rem);
  font-weight: 300;
  max-width: 640px;
  line-height: 1.25;
}

.s4-s13-sub {
  font-family: 'Cormorant Garamond', serif;
  font-size: 1.25rem;
  line-height: 1.7;
  color: rgba(245, 237, 224, 0.6);
  max-width: 640px;
  margin: 0;
}

.s4-bounce-arrow {
  margin-top: 1rem;
  color: var(--terracotta);
  font-size: 1.8rem;
  animation: s4-bounce 1.6s ease-in-out infinite;
  display: block;
  cursor: default;
  user-select: none;
}

/* ═══════════════════════════════════════════════════════════════════
   HEADER COMUNE SLIDE (quando non esiste #s4-s*-inner)
   ═══════════════════════════════════════════════════════════════════ */

.s4-slide-header {
  flex-shrink: 0;
  margin-bottom: 0.8rem;
}

/* ═══════════════════════════════════════════════════════════════════
   UTILITY
   ═══════════════════════════════════════════════════════════════════ */

/* Nascondere elementi */
.s4-hidden {
  display: none !important;
}

/* Box dark generico */
.s4-dark-box {
  background: var(--charcoal);
  border: 1px solid rgba(245, 237, 224, 0.07);
  border-radius: 3px;
  padding: 0.8rem 1rem;
}

/* Separatori nei pannelli */
.s4-divider {
  border: none;
  border-top: 1px solid rgba(245, 237, 224, 0.07);
  margin: 0.3rem 0;
}

/* Etichette preset gradi MCS */
.s4-presets-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.55rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--cream);
  opacity: 0.3;
  margin-bottom: 0.2rem;
}

/* Wrapper canvas nomogramma (allinea a destra) */
.s4-nomo-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
}

/* Griglia input nomogramma */
.s4-nomo-input-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.5rem;
  width: 100%;
  max-width: 340px;
}

.s4-nomo-input-grid label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.58rem;
  color: var(--ochre);
  opacity: 0.75;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  display: block;
  margin-bottom: 0.2rem;
}

/* Marker "L'Aquila" fisso sullo slider */
.s4-slider-aquila-wrapper {
  position: relative;
  width: 100%;
}

.s4-slider-aquila-mark {
  position: absolute;
  bottom: 100%;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.55rem;
  color: var(--blood);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  white-space: nowrap;
  transform: translateX(-50%);
  padding-bottom: 3px;
  pointer-events: none;
}

.s4-slider-aquila-mark::after {
  content: '';
  display: block;
  width: 1px;
  height: 8px;
  background: var(--blood);
  margin: 0 auto;
  opacity: 0.7;
}

/* Badge "velocità" slider */
.s4-speed-row {
  display: flex;
  gap: 0.35rem;
  align-items: center;
}

.s4-speed-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.55rem;
  letter-spacing: 0.08em;
  color: var(--cream);
  opacity: 0.35;
  text-transform: uppercase;
  margin-right: 0.2rem;
}

/* Overflow scroll per la storia su mobile */
@media (max-width: 900px) {
  #s4-s8-inner {
    grid-template-columns: 1fr;
    grid-template-rows: auto;
    overflow-y: auto;
  }

  .s4-s8-separator {
    display: none;
  }

  #s4-s8-summary {
    grid-column: 1;
  }

  #s4-s9-inner,
  #s4-s11-inner,
  #s4-s12-inner {
    grid-template-columns: 1fr;
    grid-template-rows: auto 1fr;
  }

  #s4-s5-inner,
  #s4-s2-inner {
    grid-template-columns: 1fr;
    overflow-y: auto;
    align-items: flex-start;
  }
}