:root {
  --bg: #0F1115;          /* negro antracita */
  --card: #171A1F;        /* gris carbón */
  --text: #E9ECF1;        /* casi blanco */
  --muted: #B6BCC6;       /* gris claro */
  --accent: #FF4A45;      /* rojo-coral brillante */
  --ok: #10b981;          /* verde - mantenido */
  --danger: #FF4A45;      /* rojo-coral para consistencia */
  --shadow: 0 10px 30px rgba(0,0,0,0.4);
  --radius: 14px;
  --gap: 16px;

  /* Escalado del texto por volumen (1.0 = base) */
  --sound-scale: 1.0;

  /* Tipografía */
  --font: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
}

*,
*::before,
*::after { box-sizing: border-box; }

html, body {
  height: 100%;
  overflow-x: hidden;
}

body {
  margin: 0;
  background: radial-gradient(1200px 800px at 20% 0%, #171A1F 0%, var(--bg) 60%, #0A0B0D 100%);
  color: var(--text);
  font-family: var(--font);
  line-height: 1.5;
  letter-spacing: 0.2px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Forzar modo apaisado en móviles */
@media screen and (max-width: 900px) and (orientation: portrait) {
  body::before {
    content: "Por favor, gira tu dispositivo para usar esta aplicación";
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--bg);
    color: var(--text);
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    font-size: 18px;
    padding: 20px;
    z-index: 9999;
  }

  body > * {
    display: none !important;
  }
}

/* Cabecera con título centrado y controles a la izquierda */
.app-header {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: var(--gap);
  padding: 18px 24px;
  backdrop-filter: blur(6px) saturate(120%);
  background: rgba(17, 19, 24, 0.55);
  border-bottom: 1px solid rgba(38, 42, 51, 0.3);
}

.header-left {
  display: flex;
  align-items: center;
  gap: 10px;
  justify-self: start;
}

.brand {
  text-align: center;
  justify-self: center;
}

.brand .title {
  margin: 0;
  font-weight: 800;
  font-size: clamp(20px, 3.2vw, 28px);
  letter-spacing: 0.3px;
}

.brand .subtitle {
  margin: 2px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.header-right {
  justify-self: end;
}

.select {
  appearance: none;
  background: var(--card);
  border: 1px solid rgba(38, 42, 51, 0.5);
  color: var(--text);
  padding: 10px 12px;
  border-radius: 10px;
  outline: none;
  box-shadow: var(--shadow);
}

.btn {
  border: 0;
  border-radius: 12px;
  padding: 10px 14px;
  font-weight: 700;
  cursor: pointer;
  transition: transform 140ms ease, background 140ms ease;
  box-shadow: var(--shadow);
  white-space: nowrap;
}

.btn:active { transform: translateY(1px) scale(0.99); }

.btn-primary {
  background: linear-gradient(180deg, #FF4A45, #D93632);
  color: #fff;
}

.btn-primary.listening {
  background: linear-gradient(180deg, #FF6B66, #FF4A45);
}

.btn-secondary {
  background: #171A1F;
  color: #E9ECF1;
  border: 1px solid rgba(38, 42, 51, 0.5);
}

/* Zona principal - diseño de dos columnas */
.app-main {
  flex: 1;
  padding: 24px;
  display: flex;
  align-items: stretch;
}

.main-container {
  width: 100%;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  align-items: stretch;
}

/* Columna izquierda - cajas de texto */
.text-column {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.display-block {
  background: rgba(23, 26, 31, 0.6);
  border: 1px solid rgba(38, 42, 51, 0.3);
  border-radius: var(--radius);
  padding: 20px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.display-title {
  margin: 0 0 12px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

.text-display {
  flex: 1;
  min-height: 120px;
  font-size: calc(1.05rem * var(--sound-scale));
  line-height: 1.6;
  word-wrap: break-word;
  white-space: pre-wrap;
  overflow-y: auto;
}

.text-interim {
  color: #C3C7D1;
  opacity: 0.9;
  font-style: italic;
}

.placeholder {
  color: var(--muted);
}

/* Columna derecha - controles */
.controls-column {
  display: flex;
  align-items: stretch;
}

.controls-block {
  width: 100%;
  background: rgba(23, 26, 31, 0.6);
  border: 1px solid rgba(38, 42, 51, 0.3);
  border-radius: var(--radius);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.meter {
  width: 100%;
}

.meter-label {
  color: var(--muted);
  margin-bottom: 8px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

.meter-rail {
  width: 100%;
  height: 12px;
  background: #0A0B0D;
  border: 1px solid rgba(38, 42, 51, 0.4);
  border-radius: 32px;
  overflow: hidden;
  position: relative;
}

.meter-bar {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, #FF6B66, #FF4A45);
  transition: width 80ms linear;
}

.eq-toggle {
  display: flex;
  align-items: center;
  gap: 12px;
}

.eq-bars {
  display: grid;
  grid-template-columns: repeat(24, 1fr);
  gap: 3px;
  align-items: end;
  height: 100px;
  background: #0A0B0D;
  border: 1px solid rgba(38, 42, 51, 0.4);
  border-radius: 12px;
  padding: 10px;
}

.eq-bar {
  width: 100%;
  height: 4px;
  background: linear-gradient(180deg, #FF4A45, #FF6B66);
  border-radius: 4px;
  transition: height 80ms linear;
}

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

/* Switch genérico */
.switch {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  user-select: none;
}

.switch input {
  display: none;
}

.slider {
  width: 42px;
  height: 26px;
  background: #171A1F;
  border: 1px solid rgba(38, 42, 51, 0.5);
  border-radius: 26px;
  position: relative;
  transition: background 160ms ease;
  flex-shrink: 0;
}

.slider::after {
  content: "";
  position: absolute;
  top: 2px; left: 2px;
  width: 22px; height: 22px;
  background: #E9ECF1;
  border-radius: 50%;
  transition: transform 160ms ease, background 160ms ease;
}

.switch input:checked + .slider {
  background: #262A33;
}

.switch input:checked + .slider::after {
  transform: translateX(16px);
  background: #FF4A45;
}

.switch-label {
  color: var(--text);
  font-size: 14px;
}

/* Parte inferior: ayudas */
.extras {
  padding: 18px 24px;
  display: grid;
  gap: 16px;
  border-top: 1px solid rgba(38, 42, 51, 0.3);
  background: rgba(15, 17, 21, 0.5);
}

.help {
  display: grid;
  gap: 8px;
}

.help-tip {
  margin: 0;
  color: var(--text);
}

.help-note {
  margin: 0;
  color: var(--muted);
}

.help-note.muted {
  opacity: 0.9;
}

.error {
  background: rgba(255, 74, 69, 0.1);
  color: #FF9B98;
  border: 1px solid rgba(255, 74, 69, 0.35);
  border-radius: 12px;
  padding: 12px 14px;
}

/* Footer */
.app-footer {
  padding: 20px 24px;
  color: var(--muted);
  text-align: center;
  border-top: 1px solid rgba(38, 42, 51, 0.3);
}

/* Accesibilidad */
.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0);
  white-space: nowrap; border: 0;
}

/* Responsive - mantener diseño de dos columnas */
@media (max-width: 900px) {
  .app-header {
    padding: 14px 16px;
  }

  .header-left {
    gap: 8px;
  }

  .btn {
    padding: 8px 12px;
    font-size: 14px;
  }

  .select {
    padding: 8px 10px;
    font-size: 14px;
  }

  .app-main {
    padding: 16px;
  }

  .main-container {
    gap: 16px;
  }

  .display-block,
  .controls-block {
    padding: 16px;
  }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
}