.scene-ui{position:fixed;z-index:50;transition:opacity .5s;pointer-events:none;}
.scene-ui.hidden{display:none!important;}
.chart-panel{background:rgba(5,6,10,.85);border:1px solid var(--line-strong);border-radius:12px;padding:1rem;font-family:'JetBrains Mono',monospace;}
.chart-header{display:flex;justify-content:space-between;align-items:baseline;margin-bottom:.6rem;font-size:.65rem;letter-spacing:.1em;color:var(--ink-mute);}
.chart-header .title{color:var(--ink);font-weight:500;}
.chart-canvas-wrap{position:relative;width:100%;height:180px;margin-bottom:.6rem;}
.chart-canvas-wrap canvas{width:100%;height:100%;display:block;}
.chart-legend{display:flex;flex-direction:column;gap:.35rem;font-size:.65rem;color:var(--ink-mute);}
.chart-legend .item{display:flex;align-items:center;gap:.5rem;}
.chart-legend .line-dashed{width:20px;height:1px;background:var(--amber);border-top:1px dashed var(--amber);}
.chart-legend .line-solid{width:20px;height:2px;background:var(--cyan);}

.math-container{font-family:'Times New Roman',Times,serif;font-size:clamp(1.2rem,4vw,2rem);color:#f0ece4;display:flex;align-items:center;justify-content:center;gap:0.4rem;padding:1rem 1.5rem;background:rgba(5,6,10,0.85);border-radius:12px;border:1px solid rgba(125,249,255,0.3);box-shadow:0 0 20px rgba(125,249,255,0.1);flex-wrap:wrap;direction:ltr;}
.math-fraction{display:inline-flex;flex-direction:column;align-items:center;vertical-align:middle;}
.math-numerator{padding:0 0.5rem;border-bottom:2px solid #f0ece4;}
.math-denominator{padding:0.2rem 0.5rem 0;}
.math-part{transition:all 0.3s ease;display:inline-block;}
.highlight-eq{color:#e8b96a!important;text-shadow:0 0 15px #e8b96a,0 0 30px #e8b96a!important;transform:scale(1.15);}
#eq-caption{font-size:clamp(0.85rem,2.5vw,1.05rem);color:#7df9ff;font-style:italic;text-shadow:0 0 10px rgba(125,249,255,0.5);min-height:2.5em;text-align:center;direction:rtl;}

/* Chart positions */
#chart-2 { top:5rem; right:1.5rem; width:340px; }
#chart-4 { top:5rem; right:1.5rem; width:320px; }
#chart-6 { top:5rem; right:1.5rem; width:320px; }
#scene-5-ui { top:12%; left:50%; transform:translateX(-50%); width:95%; max-width:700px; display:flex; flex-direction:column; align-items:center; gap:1rem; }

@media (max-width:768px){
  #chart-2, #chart-4, #chart-6 { width:calc(100vw - 2rem)!important; top:5rem!important; right:1rem!important; }
  #scene-5-ui { top:3.5rem!important; gap:.5rem!important; padding:0 .5rem!important; width:100%!important; }
  #scene-5-ui .math-container { font-size:clamp(.8rem,3.5vw,1.1rem)!important; padding:.6rem 1rem!important; width:100%!important; justify-content:center!important; box-sizing:border-box!important; }
}


/* ═══════════════════════════════════════════════════════════════
   Scene 6: MOND comparison + derivation
   ═══════════════════════════════════════════════════════════════ */
#scene-6-ui {
  position: fixed;
  top: 8%;
  left: 50%;
  transform: translateX(-50%);
  max-width: 600px;
  width: 92%;
  z-index: 55;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

/* Header */
.mond-header {
  text-align: center;
}
.mond-header-tag {
  font-family: 'JetBrains Mono', monospace;
  font-size: .65rem;
  color: var(--amber);
  letter-spacing: .25em;
  text-transform: uppercase;
  margin-bottom: .4rem;
}
.mond-header-title {
  font-family: 'Instrument Serif', serif;
  font-size: clamp(1.3rem, 3.5vw, 1.9rem);
  font-weight: 400;
  color: var(--ink);
  line-height: 1.15;
}
.mond-header-title em {
  color: var(--cyan);
  font-style: italic;
}

/* Comparison cards */
.mond-compare {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: .75rem;
}
.mond-card {
  background: rgba(5,6,10,.88);
  border: 1px solid var(--line-strong);
  border-radius: 12px;
  padding: 1rem;
  opacity: 0;
  transform: translateY(10px);
  transition: all .7s cubic-bezier(.2,.7,.3,1);
}
.mond-card.show {
  opacity: 1;
  transform: translateY(0);
}
.mond-card.newton {
  border-color: rgba(232,185,106,.4);
}
.mond-card.mond {
  border-color: rgba(125,249,255,.5);
  box-shadow: 0 0 25px rgba(125,249,255,.1);
}
.mond-card-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: .65rem;
  letter-spacing: .2em;
  text-transform: uppercase;
  margin-bottom: .5rem;
  font-weight: 600;
}
.mond-card.newton .mond-card-label { color: var(--amber); }
.mond-card.mond .mond-card-label { color: var(--cyan); }
.mond-graph {
  width: 100%;
  height: 55px;
  display: block;
  margin-bottom: .5rem;
}
.mond-curve {
  fill: none;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-dasharray: 200;
  stroke-dashoffset: 200;
  transition: stroke-dashoffset 1.2s ease;
}
.mond-card.show .mond-curve {
  stroke-dashoffset: 0;
}
.newton-curve { stroke: var(--amber); }
.mond-curve-path { stroke: var(--cyan); }
.mond-card-caption {
  font-size: .72rem;
  color: var(--ink-mute);
  line-height: 1.4;
}
.mond-card.mond .mond-card-caption { color: var(--ink-dim); }

/* Derivation */
.mond-derivation {
  background: rgba(5,6,10,.9);
  border: 1px solid rgba(125,249,255,.2);
  border-radius: 12px;
  padding: .75rem 1.25rem;
}
.mond-step {
  display: grid;
  grid-template-columns: 40px 1fr;
  gap: 1rem;
  align-items: center;
  padding: .85rem 0;
  border-bottom: 1px dashed rgba(240,236,228,.08);
  opacity: 0;
  transform: translateX(-10px);
  transition: all .6s ease;
}
.mond-step:last-child { border-bottom: none; }
.mond-step.show {
  opacity: 1;
  transform: translateX(0);
}
.mond-step-num {
  font-family: 'JetBrains Mono', monospace;
  font-size: .85rem;
  font-weight: 700;
  color: var(--amber);
  text-align: center;
  border-right: 1px solid rgba(232,185,106,.3);
  padding-right: .75rem;
}
.mond-step-body {
  display: flex;
  flex-direction: column;
  gap: .2rem;
}
.mond-step-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: .6rem;
  color: var(--ink-mute);
  letter-spacing: .15em;
  text-transform: uppercase;
}
.mond-step-eq {
  font-family: 'Times New Roman', Times, serif;
  font-size: clamp(1rem, 2.4vw, 1.35rem);
  color: var(--ink);
  direction: ltr;
  text-align: left;
}

/* Result step */
.mond-step-result {
  background: linear-gradient(90deg, rgba(125,249,255,.12), rgba(125,249,255,.02));
  border-radius: 8px;
  padding: 1rem .75rem;
  margin-top: .5rem;
  border-bottom: none;
}
.mond-step-result .mond-step-num {
  color: var(--cyan);
  border-right-color: rgba(125,249,255,.3);
}
.mond-step-result .mond-step-eq {
  color: var(--cyan);
  font-weight: 600;
  text-shadow: 0 0 20px rgba(125,249,255,.5);
  animation: pulseGlow 2s ease-in-out infinite;
}
@keyframes pulseGlow {
  0%, 100% { text-shadow: 0 0 15px rgba(125,249,255,.3); }
  50% { text-shadow: 0 0 25px rgba(125,249,255,.7); }
}

#mond-caption {
  font-size: clamp(.8rem, 1.8vw, .95rem);
  color: var(--cyan);
  font-style: italic;
  text-align: center;
  min-height: 2em;
  text-shadow: 0 0 10px rgba(125,249,255,.3);
  padding: .25rem;
}

/* Mobile */
@media (max-width: 640px) {
  #scene-6-ui { top: 4.5rem; gap: .6rem; }
  .mond-compare { gap: .5rem; }
  .mond-card { padding: .75rem; }
  .mond-card-label { font-size: .55rem; }
  .mond-card-caption { font-size: .65rem; }
  .mond-graph { height: 40px; }
  .mond-derivation { padding: .5rem .9rem; }
  .mond-step { grid-template-columns: 28px 1fr; gap: .5rem; padding: .6rem 0; }
  .mond-step-num { font-size: .7rem; padding-right: .5rem; }
  .mond-step-label { font-size: .55rem; }
}

/* chart-6 overlaps scene-6-ui on mobile — SVG cards already visualize the comparison */
@media (max-width: 768px) {
  #chart-6 { display: none !important; }
}

/* Scene 3: caption */
#scene-3-ui {
  position: fixed;
  top: 5rem;
  left: 50%;
  transform: translateX(-50%);
  max-width: 520px;
  width: 90%;
  text-align: center;
  z-index: 55;
  pointer-events: none;
}
#scene-3-caption {
  font-family: 'Vazirmatn', 'Inter', sans-serif;
  font-size: clamp(0.85rem, 2.2vw, 1.05rem);
  font-weight: 500;
  color: #7df9ff;
  font-style: italic;
  text-shadow: 0 0 15px rgba(125, 249, 255, 0.5);
  padding: 0.6rem 1rem;
  background: rgba(5, 6, 10, 0.75);
  border: 1px solid rgba(125, 249, 255, 0.25);
  border-radius: 10px;
  min-height: 1.5em;
  transition: color 0.4s, text-shadow 0.4s;
  direction: rtl;
  display: inline-block;
}
#scene-3-caption.ltr {
  direction: ltr;
  font-family: 'Inter', sans-serif;
}

@media (max-width: 640px) {
  #scene-3-ui { top: 4.5rem; max-width: 95%; }
  #scene-3-caption { font-size: 0.78rem; padding: 0.45rem 0.7rem; }
}


/* ═══════════════════════════════════════════════════════════════
   Scene 7: Control-room HUD
   ═══════════════════════════════════════════════════════════════ */
#ui-7 {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 50;
}
#ui-7 .hud-box {
  position: fixed;
  top: 5rem;
  padding: 0.7rem 1rem;
  background: rgba(5, 6, 10, 0.72);
  border: 1px solid rgba(125, 249, 255, 0.28);
  border-radius: 8px;
  font-family: 'JetBrains Mono', monospace;
  backdrop-filter: blur(8px);
  min-width: 130px;
}
#ui-7 .hud-tl { left: 1.5rem; }
#ui-7 .hud-tr { right: 1.5rem; text-align: right; }
#ui-7 .hud-label {
  font-size: 0.58rem;
  color: #6b655c;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  margin-bottom: 0.3rem;
}
#ui-7 .hud-val {
  font-size: 1.3rem;
  color: #7df9ff;
  font-weight: 600;
  line-height: 1.05;
  letter-spacing: 0.02em;
}
#ui-7 .hud-sub {
  font-size: 0.62rem;
  color: #a8a094;
  margin-top: 0.25rem;
  letter-spacing: 0.05em;
}
#ui-7 .hud-bottom {
  position: fixed;
  bottom: 8.5rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.5rem 1.1rem;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.78rem;
  letter-spacing: 0.18em;
  color: #7df9ff;
  background: rgba(5, 6, 10, 0.72);
  border: 1px solid rgba(125, 249, 255, 0.28);
  border-radius: 100px;
  backdrop-filter: blur(8px);
  white-space: nowrap;
  transition: all 0.4s ease;
}
#ui-7 .hud-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #7df9ff;
  animation: hudPulse 1.5s ease-in-out infinite;
}
#ui-7 .hud-bottom.silence {
  color: #6b655c;
  border-color: rgba(240, 236, 228, 0.15);
}
#ui-7 .hud-bottom.silence .hud-dot {
  background: #6b655c;
  animation: none;
  box-shadow: none;
}
@keyframes hudPulse {
  0%, 100% { opacity: 1; box-shadow: 0 0 10px #7df9ff; }
  50%      { opacity: 0.35; box-shadow: 0 0 2px #7df9ff; }
}

@media (max-width: 640px) {
  #ui-7 .hud-box { top: 4rem; padding: 0.5rem 0.75rem; min-width: 100px; }
  #ui-7 .hud-tl { left: 0.75rem; }
  #ui-7 .hud-tr { right: 0.75rem; }
  #ui-7 .hud-val { font-size: 1rem; }
  #ui-7 .hud-bottom { bottom: 7.5rem; font-size: 0.65rem; padding: 0.4rem 0.85rem; }
}


/* HUD EVENTS flash pulse (triggered by scene7.js) */
@keyframes hudFlash {
  0%, 100% { transform: scale(1); text-shadow: 0 0 0 transparent; }
  50%      { transform: scale(1.25); text-shadow: 0 0 24px #ffdd88, 0 0 48px #ffdd88; }
}
#hud-events.flash {
  color: #ffdd88 !important;
  animation: hudFlash 0.45s ease-in-out 3;
}