/* ═══════════════════════════════════════════════════════════════════
   sim-shared.css  —  Sistema de diseño compartido para todos los simuladores
   Stack: Syne + Space Mono | Color tokens del index.html
   ═══════════════════════════════════════════════════════════════════ */

@import url('https://fonts.googleapis.com/css2?family=Space+Mono:wght@400;700&family=Syne:wght@400;600;800&display=swap');

/* ── Tokens ─────────────────────────────────────────────────────── */
:root {
  --bg:                     #05070f;
  --bg-grid:                rgba(0, 229, 255, 0.03);
  --surface:                #0d1120;
  --surface-alpha:          rgba(13, 17, 32, 0.94);
  --surface2:               #111827;
  --border:                 rgba(255, 255, 255, 0.08);
  --border-strong:          rgba(255, 255, 255, 0.16);
  --accent1:                #00e5ff;   /* cyan   */
  --accent2:                #ff3c6e;   /* rose   */
  --accent3:                #a3ff6b;   /* green  */
  --accent4:                #ffd166;   /* yellow */
  --accent5:                #b57bee;   /* purple */
  --accent6:                #ff9f43;   /* orange */
  --text:                   #e8ecf8;
  --text-inverse:           #05070f;
  --muted:                  #7a85a0;
  --card:                   rgba(255, 255, 255, 0.04);
  --card-hover:             rgba(255, 255, 255, 0.08);
  --glow1:                  0 0 30px rgba(0, 229, 255, 0.25);
  --glow2:                  0 0 30px rgba(255, 60, 110, 0.25);
  --glow3:                  0 0 30px rgba(163, 255, 107, 0.25);
  --glow4:                  0 0 30px rgba(255, 209, 102, 0.25);
  --glow5:                  0 0 30px rgba(181, 123, 238, 0.25);
  --glow6:                  0 0 30px rgba(255, 159, 67, 0.25);

  --chart-grid:             rgba(255, 255, 255, 0.04);
  --chart-tick:             rgba(255, 255, 255, 0.45);
  --sim-canvas-bg:          #05070f;
  --shadow-main:            0 8px 28px rgba(0, 0, 0, 0.6);

  /* panel width */
  --panel-w: 210px;
  --data-w:  240px;

  /* Default active theme variables */
  --theme-accent: var(--accent1);
  --theme-accent-alpha: rgba(0, 229, 255, 0.08);
  --theme-accent-alpha-hover: rgba(0, 229, 255, 0.15);
  --theme-glow: var(--glow1);
}

/* ── Modo Claro (Adaptación con Alto Contraste) ───────────────── */
[data-theme="light"] {
  --bg:                     #f1f5f9;   /* Slate claro */
  --bg-grid:                rgba(0, 114, 150, 0.06);
  --surface:                #ffffff;   /* Blanco puro para tarjetas */
  --surface-alpha:          rgba(255, 255, 255, 0.95);
  --surface2:               #e2e8f0;
  --border:                 rgba(0, 0, 0, 0.09);
  --border-strong:          rgba(0, 0, 0, 0.18);
  
  --text:                   #0f172a;   /* Slate oscuro profundo */
  --text-inverse:           #ffffff;
  --muted:                  #64748b;   /* Gris neutro legible */
  --card:                   rgba(0, 0, 0, 0.03);
  --card-hover:             rgba(0, 0, 0, 0.06);
  
  /* Acentos con contraste optimizado para fondos claros */
  --accent1:                #00838f;   /* Cyan oscuro */
  --accent2:                #d81b60;   /* Rosa intenso */
  --accent3:                #2e7d32;   /* Verde bosque */
  --accent4:                #b45309;   /* Ámbar */
  --accent5:                #6d28d9;   /* Púrpura intenso */
  --accent6:                #c2410c;   /* Naranja terracota */
  
  --chart-grid:             rgba(0, 0, 0, 0.07);
  --chart-tick:             rgba(15, 23, 42, 0.65);
  --sim-canvas-bg:          #f8fafc;
  --shadow-main:            0 8px 24px rgba(15, 23, 42, 0.08);

  --theme-accent:           var(--accent1);
  --theme-accent-alpha:     rgba(0, 131, 143, 0.08);
  --theme-accent-alpha-hover: rgba(0, 131, 143, 0.15);
  --theme-glow:             0 4px 20px rgba(0, 131, 143, 0.2);
}

/* Theme classes to dynamically override variables across page types */
body.theme-cyan {
  --theme-accent: var(--accent1);
  --theme-accent-alpha: rgba(0, 229, 255, 0.08);
  --theme-accent-alpha-hover: rgba(0, 229, 255, 0.15);
  --theme-glow: var(--glow1);
}
[data-theme="light"] body.theme-cyan, body.theme-cyan[data-theme="light"] {
  --theme-accent-alpha: rgba(0, 131, 143, 0.08);
  --theme-accent-alpha-hover: rgba(0, 131, 143, 0.15);
}

body.theme-rose {
  --theme-accent: var(--accent2);
  --theme-accent-alpha: rgba(255, 60, 110, 0.08);
  --theme-accent-alpha-hover: rgba(255, 60, 110, 0.15);
  --theme-glow: var(--glow2);
}
[data-theme="light"] body.theme-rose, body.theme-rose[data-theme="light"] {
  --theme-accent-alpha: rgba(216, 27, 96, 0.08);
  --theme-accent-alpha-hover: rgba(216, 27, 96, 0.15);
}

body.theme-green {
  --theme-accent: var(--accent3);
  --theme-accent-alpha: rgba(163, 255, 107, 0.08);
  --theme-accent-alpha-hover: rgba(163, 255, 107, 0.15);
  --theme-glow: var(--glow3);
}
[data-theme="light"] body.theme-green, body.theme-green[data-theme="light"] {
  --theme-accent-alpha: rgba(46, 125, 50, 0.08);
  --theme-accent-alpha-hover: rgba(46, 125, 50, 0.15);
}

body.theme-yellow {
  --theme-accent: var(--accent4);
  --theme-accent-alpha: rgba(255, 209, 102, 0.08);
  --theme-accent-alpha-hover: rgba(255, 209, 102, 0.15);
  --theme-glow: var(--glow4);
}
[data-theme="light"] body.theme-yellow, body.theme-yellow[data-theme="light"] {
  --theme-accent-alpha: rgba(180, 83, 9, 0.08);
  --theme-accent-alpha-hover: rgba(180, 83, 9, 0.15);
}

body.theme-purple {
  --theme-accent: var(--accent5);
  --theme-accent-alpha: rgba(181, 123, 238, 0.08);
  --theme-accent-alpha-hover: rgba(181, 123, 238, 0.15);
  --theme-glow: var(--glow5);
}
[data-theme="light"] body.theme-purple, body.theme-purple[data-theme="light"] {
  --theme-accent-alpha: rgba(109, 40, 217, 0.08);
  --theme-accent-alpha-hover: rgba(109, 40, 217, 0.15);
}

body.theme-orange {
  --theme-accent: var(--accent6);
  --theme-accent-alpha: rgba(255, 159, 67, 0.08);
  --theme-accent-alpha-hover: rgba(255, 159, 67, 0.15);
  --theme-glow: var(--glow6);
}
[data-theme="light"] body.theme-orange, body.theme-orange[data-theme="light"] {
  --theme-accent-alpha: rgba(194, 65, 12, 0.08);
  --theme-accent-alpha-hover: rgba(194, 65, 12, 0.15);
}

/* ── Reset & Base ────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Syne', sans-serif;
  min-height: 100vh;
  overflow-x: hidden;
  transition: background-color 0.25s ease, color 0.25s ease;
}

/* Grid background */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(var(--theme-accent-alpha) 1px, transparent 1px),
    linear-gradient(90deg, var(--theme-accent-alpha) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
  z-index: 0;
  animation: scroll-grid 20s linear infinite;
}

@keyframes scroll-grid {
  from { background-position: 0 0; }
  to { background-position: 40px 40px; }
}

/* ── Layout shell ────────────────────────────────────────────────── */
.main-container {
  position: relative;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  padding-bottom: 40px;
  z-index: 1;
}

/* Simulation canvas zone */
.simulation-area {
  position: relative;
  padding-top: 90px;
  margin-bottom: 28px;
}

.simulation-container {
  position: relative;
  width: 100%;
  background: var(--sim-canvas-bg, rgba(5,7,15,0.8));
  border-bottom: 1px solid var(--border);
}

/* p5 canvas — let p5 control height, CSS only handles width */
.simulation-container canvas {
  display: block;
  width: 100% !important;
  height: auto !important;
}

/* ── Header Buttons (Back, Mute, Theme) ─────────────────────────── */
#btnVolver, .btn-mute, .btn-theme {
  position: fixed;
  top: 14px;
  z-index: 300;
  display: inline-flex; align-items: center; gap: 6px;
  padding: 8px 16px;
  background: var(--surface-alpha);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font-family: 'Space Mono', monospace;
  font-size: 12px; font-weight: 700; letter-spacing: 0.04em;
  text-decoration: none;
  box-shadow: var(--shadow-main);
  cursor: pointer;
  transition: background 0.2s, border-color 0.2s, box-shadow 0.2s, color 0.2s, transform 0.15s;
}

#btnVolver {
  left: 14px;
}

.btn-mute {
  right: 14px;
}

.btn-theme {
  right: 130px;
}

#btnVolver:hover, .btn-mute:hover, .btn-theme:hover {
  background: var(--theme-accent-alpha-hover);
  border-color: var(--theme-accent);
  color: var(--text);
  box-shadow: var(--theme-glow);
  transform: translateY(-1px);
}
#btnVolver:active, .btn-mute:active, .btn-theme:active { transform: translateX(-1px) scale(0.97); }

/* ── Control panels (fixed desktop, stacked mobile) ─────────────── */
.controls, .data-panel {
  position: absolute;
  top: 65px;
  background: var(--surface-alpha);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  padding: 14px;
  border-radius: 12px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-main);
  z-index: 200;
  overflow-y: auto;
  max-height: calc(100vh - 80px);
}

.controls {
  left: 10px;
  width: var(--panel-w);
}

.data-panel {
  right: 10px;
  width: var(--data-w);
}

.controls h3, .data-panel h3 {
  margin: 0 0 12px;
  font-family: 'Space Mono', monospace;
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--theme-accent);
  border-bottom: 1px solid var(--border);
  padding-bottom: 8px;
}

/* ── Sliders ─────────────────────────────────────────────────────── */
.param-group { margin-bottom: 14px; }

.param-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 5px;
}

.param-label {
  font-family: 'Space Mono', monospace;
  font-size: 0.68rem;
  color: var(--muted);
}

.param-value {
  font-family: 'Space Mono', monospace;
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--theme-accent);
  background: var(--theme-accent-alpha);
  padding: 2px 8px;
  border-radius: 4px;
  min-width: 46px;
  text-align: right;
}

input[type="range"] {
  width: 100%;
  height: 4px;
  -webkit-appearance: none;
  appearance: none;
  background: var(--border-strong);
  border-radius: 2px;
  outline: none;
  cursor: pointer;
  transition: transform 0.2s, background-color 0.2s;
}
input[type="range"]:hover {
  transform: scaleY(1.5);
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px; height: 14px;
  border-radius: 50%;
  background: var(--theme-accent);
  box-shadow: 0 0 8px var(--theme-glow);
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s, background-color 0.2s;
}
input[type="range"]:hover::-webkit-slider-thumb {
  transform: scale(1.3);
  box-shadow: 0 0 14px var(--theme-accent);
}
input[type="range"]::-moz-range-thumb {
  width: 14px; height: 14px;
  border-radius: 50%;
  background: var(--theme-accent);
  border: none;
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s, background-color 0.2s;
}
input[type="range"]:hover::-moz-range-thumb {
  transform: scale(1.3);
  box-shadow: 0 0 14px var(--theme-accent);
}

/* toggle switch */
.toggle-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 14px;
}
.toggle-label {
  font-family: 'Space Mono', monospace;
  font-size: 0.68rem;
  color: var(--muted);
  flex: 1;
}
.switch {
  position: relative;
  width: 36px; height: 20px;
  flex-shrink: 0;
}
.switch input { opacity: 0; width: 0; height: 0; }
.slider-sw {
  position: absolute;
  inset: 0;
  background: var(--border-strong);
  border-radius: 20px;
  transition: 0.3s;
  cursor: pointer;
}
.slider-sw::before {
  content: '';
  position: absolute;
  width: 14px; height: 14px;
  left: 3px; bottom: 3px;
  background: var(--muted);
  border-radius: 50%;
  transition: 0.3s;
}
.switch input:checked + .slider-sw {
  background: var(--theme-accent-alpha-hover);
  border: 1px solid var(--theme-accent);
}
.switch input:checked + .slider-sw::before {
  transform: translateX(16px);
  background: var(--theme-accent);
}

/* ── Buttons ─────────────────────────────────────────────────────── */
.btn-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
  margin-top: 8px;
}
.btn-row-3 {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 5px;
  margin-top: 8px;
}

button.sim-btn {
  padding: 8px 4px;
  border: none;
  border-radius: 6px;
  color: var(--text);
  font-family: 'Space Mono', monospace;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.03em;
  cursor: pointer;
  transition: filter 0.15s, transform 0.1s, box-shadow 0.2s, background-color 0.2s;
  text-align: center;
}
button.sim-btn:hover  { filter: brightness(1.25); transform: translateY(-1px); box-shadow: var(--theme-glow); }
button.sim-btn:active { transform: scale(0.96); }

.btn-pause   { background: linear-gradient(135deg, #f9a825, #e65100); }
.btn-step    { background: linear-gradient(135deg, #00b0ff, #0055aa); }
.btn-reset   { background: linear-gradient(135deg, #e53935, #7b0000); }
.btn-csv     { background: linear-gradient(135deg, #2e7d32, #1b5e20); }
.btn-share   { background: linear-gradient(135deg, #6a1b9a, #311b92); }
.btn-primary-c { background: linear-gradient(135deg, var(--theme-accent), var(--theme-accent-alpha-hover)); color: var(--bg); box-shadow: var(--theme-glow); }

/* ── Data panel rows ─────────────────────────────────────────────── */
.data-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 4px 0;
  border-bottom: 1px solid var(--border);
  font-size: 0.75rem;
}
.data-row:last-child { border-bottom: none; }
.data-key  { font-family: 'Space Mono', monospace; color: var(--muted); font-size: 0.68rem; }
.data-val  { font-family: 'Space Mono', monospace; font-weight: 700; font-variant-numeric: tabular-nums; }
.val-cyan   { color: var(--accent1); }
.val-rose   { color: var(--accent2); }
.val-green  { color: var(--accent3); }
.val-yellow { color: var(--accent4); }
.val-purple { color: var(--accent5); }
.val-orange { color: var(--accent6); }
.val-white  { color: var(--text); }
.val-muted  { color: var(--muted); }

/* ── Step equation box ───────────────────────────────────────────── */
.step-box {
  margin-top: 10px;
  background: var(--theme-accent-alpha);
  border: 1px solid var(--theme-accent-alpha-hover);
  border-radius: 8px;
  padding: 8px 10px;
  display: none;
}
.step-box.visible { display: block; }
.step-eq {
  font-family: 'Space Mono', monospace;
  font-size: 0.65rem;
  color: var(--theme-accent);
  line-height: 1.7;
  word-break: break-all;
}

/* ── Charts section ──────────────────────────────────────────────── */
.graficas-container {
  padding: 0 20px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 340px), 1fr));
  gap: 16px;
  max-width: 1400px;
  margin: 0 auto;
  width: 100%;
}

.grafica-wrapper {
  background: var(--surface-alpha);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 14px 14px 10px;
  box-shadow: var(--shadow-main);
  position: relative;
  transition: box-shadow 0.2s, background-color 0.25s, border-color 0.25s;
}
.grafica-wrapper:hover {
  box-shadow: 0 10px 36px rgba(0,0,0,0.2);
}
.grafica-wrapper.gw-cyan   { border-top: 2px solid var(--accent1); }
.grafica-wrapper.gw-rose   { border-top: 2px solid var(--accent2); }
.grafica-wrapper.gw-green  { border-top: 2px solid var(--accent3); }
.grafica-wrapper.gw-yellow { border-top: 2px solid var(--accent4); }
.grafica-wrapper.gw-purple { border-top: 2px solid var(--accent5); }
.grafica-wrapper.gw-multi  { border-top: 2px solid var(--accent6); }

.grafica-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 10px;
}
.graph-title {
  font-family: 'Space Mono', monospace;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
}
.chart-badge {
  font-family: 'Space Mono', monospace;
  font-size: 0.72rem;
  font-weight: 700;
  padding: 2px 9px;
  border-radius: 4px;
}
.badge-cyan   { color: var(--accent1); background: var(--theme-accent-alpha); }
.badge-rose   { color: var(--accent2); background: rgba(216,27,96,0.1); }
.badge-green  { color: var(--accent3); background: rgba(46,125,50,0.1); }
.badge-yellow { color: var(--accent4); background: rgba(180,83,9,0.1); }
.badge-purple { color: var(--accent5); background: rgba(109,40,217,0.1); }
/* Dark-mode overrides for richer badge backgrounds */
:root .badge-rose   { background: rgba(255,60,110,0.08); }
:root .badge-green  { background: rgba(163,255,107,0.08); }
:root .badge-yellow { background: rgba(255,209,102,0.08); }
:root .badge-purple { background: rgba(181,123,238,0.08); }

.grafica-content {
  height: clamp(150px, 26vh, 240px);
  position: relative;
}

.equation-box {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 12px;
  margin-top: 10px;
}
.equation {
  text-align: center;
  font-family: 'Space Mono', monospace;
  font-size: 0.8rem;
  color: var(--text);
  opacity: 0.9;
}
.equation-explanation {
  font-family: 'Space Mono', monospace;
  font-size: 0.62rem;
  color: var(--muted);
  margin-top: 4px;
  text-align: center;
  line-height: 1.5;
}

.grafica-content, .chart-inner {
  touch-action: pan-y !important;
}
.grafica-content canvas, .chart-inner canvas {
  touch-action: pan-y !important;
}

.zoom-reset {
  display: none;
  margin: 8px auto 0;
  background: var(--surface-alpha);
  border: 1px solid var(--theme-accent);
  border-radius: 6px;
  color: var(--theme-accent);
  font-family: 'Space Mono', monospace;
  font-size: 10px;
  font-weight: 700;
  padding: 5px 16px;
  cursor: pointer;
  box-shadow: var(--shadow-main);
  transition: 0.2s;
  z-index: 20;
}
.zoom-reset:hover { background: var(--theme-accent-alpha-hover); color: var(--text); box-shadow: var(--theme-glow); }

.chart-hint {
  font-family: 'Space Mono', monospace;
  text-align: center;
  font-size: 0.58rem;
  color: var(--muted);
  opacity: 0.6;
  margin-top: 6px;
  letter-spacing: 0.03em;
  user-select: none;
}

/* ── Verification question panel ─────────────────────────────────── */
.verificacion-section {
  padding: 0 20px 20px;
  max-width: 1400px;
  margin: 16px auto 0;
  width: 100%;
}
.verificacion-card {
  background: var(--surface-alpha);
  border: 1px solid var(--border);
  border-left: 3px solid var(--theme-accent);
  border-radius: 12px;
  padding: 20px 24px;
  box-shadow: var(--shadow-main);
  transition: background-color 0.25s, border-color 0.25s;
}
.verificacion-card h4 {
  font-family: 'Space Mono', monospace;
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--theme-accent);
  margin-bottom: 12px;
}
.pregunta-text {
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--text);
  margin-bottom: 14px;
}
.respuesta-row {
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
}
.respuesta-input {
  flex: 1;
  min-width: 120px;
  max-width: 200px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  font-family: 'Space Mono', monospace;
  font-size: 0.82rem;
  padding: 8px 12px;
  outline: none;
  transition: border-color 0.2s;
}
.respuesta-input:focus { border-color: var(--theme-accent); }
.btn-verificar {
  background: var(--theme-accent);
  border: none;
  border-radius: 6px;
  color: var(--bg);
  font-family: 'Space Mono', monospace;
  font-size: 0.78rem;
  font-weight: 700;
  padding: 8px 18px;
  cursor: pointer;
  box-shadow: var(--theme-glow);
  transition: filter 0.15s, transform 0.1s, box-shadow 0.2s;
}
.btn-verificar:hover  { filter: brightness(1.2); transform: translateY(-1px); }
.btn-verificar:active { transform: scale(0.97); }
.feedback-box {
  margin-top: 12px;
  padding: 10px 14px;
  border-radius: 8px;
  font-family: 'Space Mono', monospace;
  font-size: 0.78rem;
  display: none;
}
.feedback-box.correct {
  background: rgba(46,125,50,0.1);
  border: 1px solid rgba(46,125,50,0.3);
  color: var(--accent3);
  display: block;
}
.feedback-box.wrong {
  background: rgba(216,27,96,0.1);
  border: 1px solid rgba(216,27,96,0.3);
  color: var(--accent2);
  display: block;
}

/* ── Status badge (deslizamiento, etc.) ──────────────────────────── */
.status-badge {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 20px;
  font-family: 'Space Mono', monospace;
  font-size: 0.65rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  font-weight: 700;
  margin-top: 8px;
}
.status-ok      { background: rgba(163,255,107,0.12); color: var(--accent3); border: 1px solid rgba(163,255,107,0.3); }
.status-warning { background: rgba(255,60,110,0.12);  color: var(--accent2); border: 1px solid rgba(255,60,110,0.3); }

/* ── Responsive Architecture (Mobile & Tablet) ────────────────────── */

/* Tablet & Mobile (900px and below) */
@media (max-width: 900px) {
  :root {
    --panel-w: 100%;
    --data-w: 100%;
  }

  /* Fixed Navigation Controls */
  #btnVolver {
    position: fixed;
    top: 10px;
    left: 10px;
    z-index: 400;
    padding: 7px 14px;
    font-size: 11px;
  }

  .btn-mute {
    position: fixed !important;
    top: 10px !important;
    right: 10px !important;
    z-index: 400 !important;
    padding: 6px 12px !important;
    font-size: 0.68rem !important;
    backdrop-filter: blur(10px);
    background: var(--surface-alpha) !important;
  }

  .simulation-area {
    padding-top: 52px;
    display: flex;
    flex-direction: column;
    margin-bottom: 20px;
  }

  /* 1. Interactive Canvas on Top */
  .simulation-container {
    order: 1;
    width: 100%;
    min-height: 280px;
    height: clamp(280px, 42vh, 420px);
    margin-bottom: 12px;
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
  }

  /* 2. Panels Grid below Canvas */
  .panels-wrapper {
    order: 2;
    display: grid;
    grid-template-columns: 1fr;
    gap: 12px;
    padding: 0 12px;
    width: 100%;
    background: transparent;
    border-bottom: none;
  }

  .controls, .data-panel {
    position: static !important;
    top: auto !important;
    left: auto !important;
    right: auto !important;
    transform: none !important;
    width: 100% !important;
    max-height: none !important;
    margin: 0 !important;
    border-radius: 12px;
    border: 1px solid var(--border);
    background: var(--surface-alpha);
    box-shadow: var(--shadow-main);
  }

  /* Side-by-side panels on medium screens */
  @media (min-width: 580px) and (max-width: 900px) {
    .panels-wrapper {
      grid-template-columns: 1fr 1fr;
      align-items: start;
    }
  }

  /* 3. Graphs Grid */
  .graficas-container {
    padding: 0 12px;
    grid-template-columns: 1fr;
    gap: 14px;
  }

  .grafica-wrapper {
    padding: 12px;
  }

  .grafica-content {
    height: clamp(150px, 26vh, 220px);
  }

  /* 4. Verification Section */
  .verificacion-section {
    padding: 0 12px 24px;
  }

  .verificacion-card {
    padding: 14px 16px;
  }

  .respuesta-row {
    flex-direction: column;
    align-items: stretch;
    gap: 8px;
  }

  .respuesta-input {
    max-width: 100%;
    width: 100%;
  }

  .btn-verificar {
    width: 100%;
    padding: 10px;
    text-align: center;
  }
}

/* Small Smartphone (480px and below) */
@media (max-width: 480px) {
  #btnVolver {
    font-size: 10px;
    padding: 6px 10px;
  }

  .btn-mute {
    font-size: 0.62rem !important;
    padding: 5px 8px !important;
    right: 8px !important;
    top: 10px !important;
  }

  .btn-theme {
    font-size: 0.62rem !important;
    padding: 5px 8px !important;
    right: 86px !important;
    top: 10px !important;
  }

  .simulation-area {
    padding-top: 48px;
  }

  .simulation-container {
    min-height: 240px;
    height: clamp(240px, 38vh, 320px);
  }

  .panels-wrapper {
    padding: 0 8px;
    gap: 10px;
  }

  .controls, .data-panel {
    padding: 12px;
    border-radius: 10px;
  }

  .param-group {
    margin-bottom: 10px;
  }

  .param-label {
    font-size: 0.64rem;
  }

  .param-value {
    font-size: 0.68rem;
    padding: 2px 6px;
    min-width: 40px;
  }

  .data-row {
    padding: 5px 0;
  }

  .data-key {
    font-size: 0.64rem;
  }

  .data-val {
    font-size: 0.74rem;
  }

  .info-grid {
    gap: 5px;
    margin-top: 8px;
  }

  .info-box {
    padding: 6px 8px;
  }

  .info-box-label {
    font-size: 0.54rem;
  }

  .info-box-val {
    font-size: 0.78rem;
  }

  /* Button touch optimization */
  .btn-row-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 5px;
    margin-top: 8px;
  }

  .btn-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 5px;
    margin-top: 5px;
  }

  button.sim-btn {
    padding: 9px 4px;
    font-size: 10px;
  }

  .graficas-container {
    padding: 0 8px;
  }

  .grafica-wrapper {
    padding: 10px;
  }

  .equation {
    font-size: 0.68rem;
  }

  .equation-explanation {
    font-size: 0.62rem;
  }

  .verificacion-section {
    padding: 0 8px 20px;
  }

  .verificacion-card {
    padding: 12px;
  }

  .pregunta-text {
    font-size: 0.82rem;
  }
}

/* ── Entrance Animations & Cascaded Staggers ─────────────────────── */
@keyframes slide-in-left {
  from { opacity: 0; transform: translateX(-50px); }
  to { opacity: 1; transform: translateX(0); }
}

@keyframes slide-in-right {
  from { opacity: 0; transform: translateX(50px); }
  to { opacity: 1; transform: translateX(0); }
}

@keyframes fade-in-bottom {
  from { opacity: 0; transform: translateY(40px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Applied staggered entries for full high-fidelity feel */
.controls {
  animation: slide-in-left 0.8s cubic-bezier(0.16, 1, 0.3, 1) both;
  animation-delay: 0.08s;
}

.data-panel {
  animation: slide-in-right 0.8s cubic-bezier(0.16, 1, 0.3, 1) both;
  animation-delay: 0.14s;
}

.simulation-container, .simulacion {
  animation: fade-in-bottom 0.8s cubic-bezier(0.16, 1, 0.3, 1) both;
  animation-delay: 0.22s;
}

.graficas-container, .chart-container {
  animation: fade-in-bottom 0.8s cubic-bezier(0.16, 1, 0.3, 1) both;
  animation-delay: 0.3s;
}

.verificacion-section {
  animation: fade-in-bottom 0.8s cubic-bezier(0.16, 1, 0.3, 1) both;
  animation-delay: 0.38s;
}