/* ============================================================
   PERKINS DIGITAL  — Rediseño v2.0
   Estética: Tech-médica / accesibilidad futurista
   Tipografía: Space Mono (mono técnica) + DM Sans (legibilidad)
   ============================================================ */

:root {
  --bg-base:       #060a0f;
  --bg-card:       #0b1017;
  --bg-panel:      #0f1620;
  --bg-input:      #080d14;
  --border:        #1c2a38;
  --border-bright: #2a3f55;

  --accent-blue:   #2d8cf0;
  --accent-green:  #00d68f;
  --accent-yellow: #f0c040;
  --accent-red:    #e05252;

  --text-primary:  #dce8f5;
  --text-secondary:#6b8aaa;
  --text-muted:    #3a5068;

  --dot-off:       #111d29;
  --dot-on:        #00d68f;
  --dot-glow:      rgba(0, 214, 143, 0.55);

  --font-mono: 'Space Mono', monospace;
  --font-body: 'DM Sans', sans-serif;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  background: var(--bg-base);
  color: var(--text-primary);
  font-family: var(--font-body);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  padding: 20px 12px 40px;
  /* Sutil textura de fondo */
  background-image:
    radial-gradient(ellipse 80% 50% at 50% -10%, rgba(45,140,240,0.08) 0%, transparent 70%);
}

/* ===== OVERLAY ===== */
#overlay-inicio {
  position: fixed; inset: 0;
  z-index: 10000;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer;
  overflow: hidden;
}
.overlay-bg {
  position: absolute; inset: 0;
  background: rgba(6, 10, 15, 0.97);
  backdrop-filter: blur(8px);
}
.overlay-content {
  position: relative; z-index: 1;
  text-align: center;
  display: flex; flex-direction: column; align-items: center; gap: 18px;
  animation: fadeInUp 0.6s ease;
}
.overlay-title {
  font-family: var(--font-mono);
  font-size: 3rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: 0.15em;
}
.overlay-sub {
  font-size: 0.95rem;
  color: var(--text-secondary);
  letter-spacing: 0.08em;
  font-family: var(--font-mono);
}
.overlay-pulse {
  display: flex; gap: 10px; margin: 10px 0;
}
.overlay-pulse span {
  width: 14px; height: 14px; border-radius: 50%;
  background: var(--dot-off);
  border: 2px solid var(--border-bright);
  animation: pulseOrb 1.6s ease-in-out infinite;
}
.overlay-pulse span:nth-child(1) { animation-delay: 0s; }
.overlay-pulse span:nth-child(2) { animation-delay: 0.15s; }
.overlay-pulse span:nth-child(3) { animation-delay: 0.3s; }
.overlay-pulse span:nth-child(4) { animation-delay: 0.45s; }
.overlay-pulse span:nth-child(5) { animation-delay: 0.6s; }
.overlay-pulse span:nth-child(6) { animation-delay: 0.75s; }
@keyframes pulseOrb {
  0%, 100% { background: var(--dot-off); }
  50% { background: var(--dot-on); box-shadow: 0 0 12px var(--dot-glow); }
}
.btn-start {
  padding: 14px 48px;
  font-family: var(--font-mono);
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  background: transparent;
  color: var(--accent-green);
  border: 2px solid var(--accent-green);
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.25s;
}
.btn-start:hover {
  background: var(--accent-green);
  color: var(--bg-base);
  box-shadow: 0 0 24px var(--dot-glow);
}
.overlay-hint {
  font-size: 0.78rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

/* ===== LAYOUT ===== */
.layout { width: 100%; max-width: 1440px; }

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px 28px;
  box-shadow: 0 0 60px rgba(0,0,0,0.5), inset 0 1px 0 rgba(255,255,255,0.03);
}

/* ===== HEADER ===== */
.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 22px;
}
.header-left { display: flex; align-items: center; gap: 16px; }
.header-logo { height: 46px; }
.title {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: 0.06em;
}
.title-s3 {
  display: none !important;
}
.subtitle {
  font-size: 0.78rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
  margin-top: 4px;
  letter-spacing: 0.04em;
}
.header-right {
  display: flex; flex-direction: column; align-items: flex-end; gap: 6px;
}
.status-tag {
  display: flex; align-items: center; gap: 6px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--accent-green);
  letter-spacing: 0.1em;
}
.status-dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--accent-green);
  animation: blink 2s ease-in-out infinite;
}
@keyframes blink { 0%,100%{opacity:1} 50%{opacity:0.3} }

.session-info {
  display: flex; align-items: center; gap: 8px;
  font-family: var(--font-mono); font-size: 0.72rem;
}
.session-label { color: var(--text-muted); letter-spacing: 0.08em; }
.session-name { color: var(--accent-yellow); font-weight: 700; }
.session-timer { color: var(--text-secondary); }

/* ===== MAIN PANEL (dos columnas) ===== */
.main-panel {
  display: grid;
  grid-template-columns: 360px 1fr;
  gap: 22px;
}

/* ===== PANEL LABEL ===== */
.panel-label {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  color: var(--text-muted);
  margin-bottom: 12px;
  text-transform: uppercase;
  border-left: 2px solid var(--accent-blue);
  padding-left: 8px;
}

/* ===== CARDS GENÉRICAS ===== */
.braille-card, .metrics-card, .speed-card,
.lang-card, .buffer-card, .braille-text-card, .actions-card {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 18px;
  margin-bottom: 14px;
}
.braille-card:last-child, .metrics-card:last-child, .speed-card:last-child,
.lang-card:last-child, .buffer-card:last-child, .braille-text-card:last-child, .actions-card:last-child {
  margin-bottom: 0;
}
.left-panel, .right-panel {
  display: flex; flex-direction: column;
}

/* ===== CELDA BRAILLE ===== */
.braille-inner {
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
}
.braille-grid {
  display: grid;
  grid-template-columns: repeat(2, 52px);
  gap: 14px;
}
.dot {
  width: 52px; height: 52px; border-radius: 50%;
  background: var(--dot-off);
  border: 2px solid var(--border-bright);
  display: flex; align-items: center; justify-content: center;
  transition: all 0.12s ease;
  position: relative;
}
.dot span {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--text-muted);
  transition: opacity 0.15s;
}
.dot.active {
  background: var(--dot-on);
  border-color: var(--dot-on);
  box-shadow: 0 0 18px var(--dot-glow), inset 0 1px 0 rgba(255,255,255,0.2);
}
.dot.active span { opacity: 0; }

.char-display {
  flex: 1; text-align: center;
}
.big-char {
  font-family: var(--font-mono);
  font-size: 7rem;
  font-weight: 700;
  color: var(--accent-blue);
  line-height: 1;
  text-shadow: 0 0 30px rgba(45,140,240,0.4);
  transition: all 0.1s;
  min-width: 80px;
}
.mask-hex {
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--accent-yellow);
  text-align: center;
  margin-top: 4px;
  letter-spacing: 0.1em;
}
.char-state {
  display: flex; justify-content: center; gap: 6px; margin-top: 8px;
}
.state-badge {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  padding: 2px 7px;
  border-radius: 3px;
  background: var(--border);
  color: var(--text-muted);
  border: 1px solid var(--border);
  transition: all 0.2s;
}
.state-badge.on {
  background: rgba(240, 192, 64, 0.15);
  color: var(--accent-yellow);
  border-color: var(--accent-yellow);
}

/* ===== MÉTRICAS ===== */
.metrics-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
  margin-bottom: 14px;
}
.metric-box {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px 10px;
  text-align: center;
}
.metric-value {
  font-family: var(--font-mono);
  font-size: 1.7rem;
  font-weight: 700;
  color: var(--accent-green);
  line-height: 1;
}
.metric-label {
  font-family: var(--font-mono);
  font-size: 0.58rem;
  color: var(--text-muted);
  letter-spacing: 0.12em;
  margin-top: 5px;
}

.wpm-bar-wrap { }
.wpm-bar-track {
  height: 6px;
  background: var(--bg-card);
  border-radius: 3px;
  overflow: hidden;
  border: 1px solid var(--border);
}
.wpm-bar-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--accent-blue), var(--accent-green));
  border-radius: 3px;
  transition: width 0.6s ease;
}
.wpm-bar-label {
  font-family: var(--font-mono);
  font-size: 0.58rem;
  color: var(--text-muted);
  margin-top: 5px;
  display: block;
}

/* ===== VELOCIDAD ===== */
.speed-inner { }
.speed-num {
  font-family: var(--font-mono);
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 12px;
}
.speed-unit {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-left: 6px;
}
#speedSlider {
  width: 100%;
  -webkit-appearance: none;
  height: 4px;
  border-radius: 2px;
  background: var(--border-bright);
  outline: none;
  cursor: pointer;
}
#speedSlider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 16px; height: 16px;
  border-radius: 50%;
  background: var(--accent-blue);
  box-shadow: 0 0 8px rgba(45,140,240,0.6);
  cursor: pointer;
}
.speed-ticks {
  display: flex; justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 0.6rem;
  color: var(--text-muted);
  margin-top: 6px;
}

/* ===== IDIOMA ===== */
.lang-btns { display: flex; gap: 10px; flex-wrap: wrap; }
.lang-btn {
  flex: 1 1 120px;
  padding: 12px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  background: var(--bg-card);
  color: var(--text-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.2s;
  display: flex; align-items: center; justify-content: center; gap: 8px;
}
.lang-btn:hover { border-color: var(--accent-blue); color: var(--text-primary); }
.lang-btn.active {
  background: rgba(45,140,240,0.12);
  border-color: var(--accent-blue);
  color: var(--accent-blue);
}
.lang-flag { font-size: 1.1rem; }

/* ===== BUFFER ===== */
.buffer-card { flex: 1; display: flex; flex-direction: column; }
#buffer {
  flex: 1;
  width: 100%;
  height: 200px;
  font-family: var(--font-mono);
  font-size: 1.3rem;
  line-height: 1.6;
  padding: 14px;
  background: var(--bg-input);
  color: var(--accent-blue);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  resize: none;
  outline: none;
  transition: border-color 0.2s;
  caret-color: var(--accent-green);
}
#buffer::placeholder { color: var(--text-muted); font-size: 0.85rem; }
#buffer:focus { border-color: var(--border-bright); }

/* ===== ACCIONES ===== */
.actions-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}
button {
  font-family: var(--font-body);
  font-size: 0.85rem;
  font-weight: 500;
  padding: 11px 14px;
  background: var(--bg-card);
  color: var(--text-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.18s;
  display: flex; align-items: center; justify-content: center; gap: 6px;
}
button:hover { border-color: var(--border-bright); color: var(--text-primary); }

.btn-sesion {
  grid-column: span 2;
  background: rgba(0, 214, 143, 0.1);
  border-color: var(--accent-green);
  color: var(--accent-green);
  font-weight: 600;
  font-size: 0.9rem;
}
.btn-sesion:hover {
  background: var(--accent-green);
  color: var(--bg-base);
  box-shadow: 0 0 16px var(--dot-glow);
}
.btn-sesion.detener {
  background: rgba(224, 82, 82, 0.1);
  border-color: var(--accent-red);
  color: var(--accent-red);
}
.btn-sesion.detener:hover {
  background: var(--accent-red);
  color: white;
  box-shadow: 0 0 16px rgba(224,82,82,0.4);
}

.btn-csv {
  background: rgba(240,192,64,0.08);
  border-color: rgba(240,192,64,0.3);
  color: var(--accent-yellow);
}
.btn-csv:hover {
  background: rgba(240,192,64,0.18);
  border-color: var(--accent-yellow);
}

/* ===== MODAL RESUMEN ===== */
.modal-overlay {
  position: fixed; inset: 0;
  background: rgba(6,10,15,0.88);
  backdrop-filter: blur(6px);
  z-index: 9000;
  display: flex; align-items: center; justify-content: center;
}
.modal-card {
  background: var(--bg-card);
  border: 1px solid var(--border-bright);
  border-radius: var(--radius-lg);
  padding: 32px;
  width: 520px;
  max-width: 94vw;
  box-shadow: 0 0 80px rgba(0,0,0,0.7);
  animation: fadeInUp 0.35s ease;
}
.modal-header { margin-bottom: 24px; }
.modal-title {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
  letter-spacing: 0.18em;
  margin-bottom: 6px;
}
.modal-alumno {
  font-family: var(--font-mono);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: 0.06em;
}
.modal-metrics {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin-bottom: 24px;
}
.modal-metric {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 10px 8px;
  text-align: center;
  overflow: hidden;
  min-width: 0;
}
.modal-val {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent-green);
  word-break: break-all;
  overflow-wrap: break-word;
  line-height: 1.15;
}
.modal-lbl {
  font-family: var(--font-mono);
  font-size: 0.58rem;
  color: var(--text-muted);
  letter-spacing: 0.1em;
  margin-top: 5px;
}
.modal-actions {
  display: flex; gap: 10px;
}
.modal-actions button { flex: 1; }

/* ===== ANIMACIONES ===== */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}

.card { animation: fadeInUp 0.5s ease; }



/* ===== V5: IDIOMAS EN COLUMNA LATERAL (ESCRITORIO) =====
   La tarjeta de idiomas sale del flujo normal sólo en pantallas grandes.
   Así el panel derecho gana altura sin cambiar HTML ni app.js.
*/
@media (min-width: 1181px) {
  .main-panel {
    position: relative;
    padding-right: 166px; /* reserva la franja lateral */
  }

  .lang-card {
    position: absolute;
    top: 0;
    right: 0;
    width: 144px;
    margin-bottom: 0;
    padding: 14px 12px;
  }

  .lang-card .panel-label {
    margin-bottom: 10px;
  }

  .lang-btns {
    display: flex;
    flex-direction: column;
    gap: 8px;
  }

  .lang-btn {
    flex: 0 0 auto;
    width: 100%;
    min-height: 48px;
    padding: 10px 8px;
    font-size: 0.72rem;
    letter-spacing: 0.045em;
  }

  .lang-flag {
    font-size: 1rem;
  }
}

/* ===== AJUSTE DE ANCHO PARA ESCRITORIO ===== */
@media (max-width: 1180px) and (min-width: 721px) {
  .layout { max-width: 1080px; }
  .main-panel {
    grid-template-columns: 330px 1fr;
    gap: 18px;
    padding-right: 0;
  }
  .lang-card {
    position: static;
    width: auto;
    margin-bottom: 14px;
  }
  .lang-btns {
    flex-direction: row;
    flex-wrap: wrap;
  }
  .lang-btn {
    flex: 1 1 120px;
    width: auto;
    min-height: 0;
  }
}

/* ===== RESPONSIVE ===== */
@media (max-width: 720px) {
  .main-panel { grid-template-columns: 1fr; }
  .big-char { font-size: 5rem; }
  .modal-metrics { grid-template-columns: repeat(2, 1fr); }
  .modal-card { padding: 20px; }
}

/* ===== TTS RESUMEN ===== */
.modal-tts {
  margin-bottom: 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.modal-tts-bar-wrap {
  height: 4px;
  background: var(--border);
  border-radius: 2px;
  overflow: hidden;
}
.modal-tts-bar {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--accent-blue), var(--accent-green));
  border-radius: 2px;
  transition: width 0.25s ease;
}
.btn-tts-resumen {
  width: 100%;
  background: rgba(45,140,240,0.08);
  border: 1px solid var(--accent-blue);
  color: var(--accent-blue);
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  padding: 10px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.2s;
}
.btn-tts-resumen:hover:not(:disabled) {
  background: rgba(45,140,240,0.18);
}
.btn-tts-resumen:disabled {
  opacity: 0.5;
  cursor: default;
}

/* ===== DEMO SIN ESP32 ===== */
.demo-card {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 18px;
  margin-bottom: 14px;
}
#demoInput {
  width: 100%;
  min-height: 92px;
  font-family: var(--font-mono);
  font-size: 0.95rem;
  line-height: 1.45;
  padding: 12px;
  background: var(--bg-input);
  color: var(--text-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  resize: vertical;
  outline: none;
}
#demoInput:focus { border-color: var(--accent-blue); }
.demo-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-top: 8px;
}
.btn-demo {
  background: rgba(45,140,240,0.08);
  border-color: rgba(45,140,240,0.45);
  color: var(--accent-blue);
}
.btn-demo:hover {
  background: rgba(45,140,240,0.18);
  border-color: var(--accent-blue);
}


/* ===== PANEL LATERAL DE LECCIONES ===== */
.lesson-sidebar-toggle {
  position: fixed;
  right: 0;
  top: 36%;
  z-index: 1200;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 10px;
  border: 1px solid var(--accent-blue);
  border-right: 0;
  border-radius: 10px 0 0 10px;
  background: var(--bg-panel);
  color: var(--accent-cyan);
  font-family: var(--font-mono);
  font-size: .75rem;
  font-weight: 700;
  letter-spacing: .06em;
  cursor: pointer;
  box-shadow: 0 8px 24px rgba(0,0,0,.35);
}
.lesson-sidebar-toggle:hover { background: rgba(45,140,240,.16); }
.lesson-sidebar-toggle[aria-expanded="true"] { opacity: 0; pointer-events: none; }
.lesson-sidebar {
  position: fixed;
  top: 0;
  right: 0;
  z-index: 1300;
  width: min(390px, 92vw);
  height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--bg-card);
  border-left: 1px solid var(--border-bright);
  box-shadow: -18px 0 42px rgba(0,0,0,.48);
  transform: translateX(105%);
  transition: transform .28s ease;
}
.lesson-sidebar.open { transform: translateX(0); }
.lesson-sidebar-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 14px;
  padding: 20px 18px 14px;
  border-bottom: 1px solid var(--border);
}
.lesson-sidebar-header .panel-label { margin-bottom: 5px; }
.lesson-sidebar-subtitle { color: var(--text-muted); font-size: .78rem; }
.lesson-sidebar-close {
  width: 36px; height: 36px; border-radius: 50%;
  border: 1px solid var(--border); background: var(--bg-panel);
  color: var(--text-primary); font-size: 1.5rem; line-height: 1; cursor: pointer;
}
.lesson-sidebar-close:hover { border-color: var(--accent-blue); color: var(--accent-cyan); }
.lesson-sidebar-body { padding: 18px; overflow-y: auto; flex: 1; }
.lesson-sidebar-note {
  padding: 13px 18px 16px; border-top: 1px solid var(--border);
  color: var(--text-muted); font-size: .72rem; line-height: 1.45;
}
.lesson-sidebar-backdrop {
  position: fixed; inset: 0; z-index: 1250;
  background: rgba(0,0,0,.48); opacity: 0; pointer-events: none;
  transition: opacity .28s ease;
}
.lesson-sidebar-backdrop.open { opacity: 1; pointer-events: auto; }
.lesson-chooser { display: grid; grid-template-columns: 1fr; gap: 10px; }
.lesson-select { min-height: 78px; display: flex; flex-direction: column; align-items: flex-start; justify-content: center; gap: 5px; text-align: left; }
.lesson-select strong { color: var(--accent-cyan); font-size: .95rem; }
.lesson-select span { color: var(--text-muted); font-size: .8rem; }
.lesson-panel { border: 1px solid var(--border-bright); border-radius: var(--radius-sm); padding: 18px; text-align: center; background: rgba(0,0,0,.12); }
.lesson-title { color: var(--accent-cyan); font-weight: 700; margin-bottom: 12px; }
.lesson-instruction { font-size: 1.15rem; margin-bottom: 12px; }
.lesson-target { font-size: 2rem; font-weight: 800; color: var(--accent-cyan); min-height: 2.6rem; margin: 2px 0 12px; }
.lesson-progress { font-family: monospace; font-size: 1.4rem; letter-spacing: .18em; min-height: 34px; margin-bottom: 8px; }
.lesson-feedback { min-height: 40px; font-weight: 700; margin: 8px 0; }
.lesson-feedback.ok { color: var(--accent-green); }
.lesson-feedback.error { color: #ff6b6b; }
.lesson-stats { display: flex; justify-content: center; gap: 24px; color: var(--text-muted); font-size: .85rem; margin: 10px 0 14px; }
.lesson-exit { width: 100%; }
@media (max-width: 700px) {
  .lesson-sidebar-toggle { top: auto; bottom: 18px; right: 12px; border-right: 1px solid var(--accent-blue); border-radius: 10px; }
  .lesson-sidebar { width: 100%; height: min(78vh, 680px); top: auto; bottom: 0; border-left: 0; border-top: 1px solid var(--border-bright); transform: translateY(105%); }
  .lesson-sidebar.open { transform: translateY(0); }
}


/* ===== PANEL DE LECCIONES: ESCRITORIO SIN SUPERPOSICION ===== */
@media (min-width: 901px) {
  body {
    transition: padding-right .28s ease;
  }
  body.lesson-sidebar-open {
    padding-right: 402px;
  }
  body.lesson-sidebar-open .lesson-sidebar-backdrop {
    display: none !important;
  }
  .lesson-sidebar-backdrop.open {
    opacity: 0;
    pointer-events: none;
  }
}

/* En tablet y móvil se conserva el panel superpuesto. */
@media (max-width: 900px) {
  body.lesson-sidebar-open {
    padding-right: 12px;
  }
}

/* VERSION GITHUB FINAL 20260806-1130 */


/* ===== TEXTO BRAILLE UNICODE ===== */
.braille-text-card {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 18px;
  margin-bottom: 14px;
}

.braille-text-output {
  width: 100%;
  min-height: 110px;
  max-height: 210px;
  overflow-y: auto;
  white-space: pre-wrap;
  overflow-wrap: anywhere;

  padding: 16px 18px;

  background:
    linear-gradient(180deg, rgba(0,214,143,0.025), rgba(0,214,143,0.00)),
    var(--bg-input);

  color: var(--accent-green);
  border: 1px solid var(--border-bright);
  border-radius: var(--radius-sm);

  /* Priorizamos fuentes con buen soporte de Braille Unicode */
  font-family:
    "Segoe UI Symbol",
    "Noto Sans Symbols 2",
    "Arial Unicode MS",
    sans-serif;

  /* Más grande y más compacto que V1/V2 */
  font-size: 3rem;
  line-height: 1.22;
  letter-spacing: 0.015em;

  text-rendering: geometricPrecision;
  font-variant-ligatures: none;

  /* Un halo muy leve para separar mejor los puntos del fondo */
  text-shadow: 0 0 8px rgba(0,214,143,0.16);
}

/* En pantallas angostas se reduce un poco para evitar saltos excesivos */
@media (max-width: 720px) {
  .braille-text-output {
    font-size: 2.35rem;
    min-height: 96px;
    max-height: 180px;
    padding: 14px;
    letter-spacing: 0;
  }
}

/* VERSION DEMO BRAILLE V3 VISUAL 20260912 */

/* VERSION DEMO BRAILLE V4 ANCHO 20260913 */

/* VERSION DEMO BRAILLE V5 IDIOMAS VERTICALES 20260913 */