:root {
  --coral: #FF6B5E;
  --teal: #2FBFAE;
  --sun: #FFC93C;
  --violet: #8B7FE8;
  --leaf: #6FCF7A;
  --bg: #FFFCF5;
  --ink: #2C2620;
  --card: #FFFFFF;
  --radius-lg: 28px;
  --radius-md: 18px;
  --focus: #1B4DE4;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
  height: 100dvh;
  overflow: hidden;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, "Segoe UI Rounded", "Segoe UI", Verdana, sans-serif;
  font-weight: 700;
  -webkit-user-select: none;
  user-select: none;
  touch-action: manipulation;
}

button {
  font-family: inherit;
  border: none;
  cursor: pointer;
}

button:focus-visible,
a:focus-visible,
[tabindex]:focus-visible {
  outline: 5px solid var(--focus);
  outline-offset: 3px;
}

.pantalla {
  position: absolute;
  inset: 0;
  display: none;
  flex-direction: column;
  padding-top: env(safe-area-inset-top);
  padding-bottom: env(safe-area-inset-bottom);
  padding-left: env(safe-area-inset-left);
  padding-right: env(safe-area-inset-right);
}
.pantalla.activa { display: flex; }

/* ---------- Pantalla de nombre (sin login) ---------- */
#pantalla-nombre {
  background: linear-gradient(180deg, #FFF3DE 0%, var(--bg) 60%);
  align-items: center;
  justify-content: center;
}
.caja-nombre {
  background: var(--card);
  border-radius: var(--radius-lg);
  box-shadow: 0 8px 0 rgba(0,0,0,0.08);
  padding: 40px 36px;
  width: min(90vw, 420px);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 18px;
  text-align: center;
}
.caja-nombre .icono-bienvenida { font-size: 56px; }
.caja-nombre h1 { color: var(--coral); font-size: clamp(22px, 4vw, 30px); margin: 0; }
.caja-nombre input {
  width: 100%;
  padding: 18px;
  border-radius: 100px;
  border: 3px solid #FFE3B0;
  font-size: 20px;
  text-align: center;
  font-family: inherit;
  font-weight: 700;
  color: var(--ink);
}
.etiqueta-avatar { margin: 4px 0 0; font-size: 15px; color: var(--ink); }
.tabs-avatar {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: center;
}
.tab-avatar {
  background: #FFF3DE;
  color: var(--ink);
  border-radius: 100px;
  padding: 8px 14px;
  font-size: 14px;
}
.tab-avatar.activa {
  background: var(--violet);
  color: white;
}
.grid-avatares {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 8px;
  width: 100%;
  max-height: 160px;
  overflow-y: auto;
  padding: 4px;
}
.opcion-avatar {
  background: white;
  border: 3px solid #f0eee8;
  border-radius: 16px;
  font-size: 30px;
  padding: 8px 0;
}
.opcion-avatar.seleccionado {
  border-color: var(--coral);
  background: #FFF0EC;
}
.btn-comenzar {
  background: var(--coral);
  color: white;
  border-radius: 100px;
  padding: 16px 30px;
  font-size: 20px;
  width: 100%;
}
.btn-nuevo-estudiante {
  background: var(--card);
  color: var(--ink);
  border-radius: 100px;
  padding: 10px 18px;
  font-size: 14px;
  box-shadow: 0 3px 0 rgba(0,0,0,0.08);
  margin-left: auto;
}

/* ---------- Home ---------- */
#pantalla-inicio {
  background: linear-gradient(180deg, #FFF3DE 0%, var(--bg) 60%);
  padding: 24px;
  align-items: center;
}

.encabezado {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  width: 100%;
  max-width: 1100px;
}

.encabezado h1 {
  font-size: clamp(24px, 4vw, 40px);
  color: var(--coral);
  margin: 0;
}

.grid-actividades {
  flex: 1;
  width: 100%;
  max-width: 1100px;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 20px;
  margin-top: 20px;
  overflow-y: auto;
  padding-bottom: 20px;
}

.tarjeta-actividad {
  background: var(--card);
  border-radius: var(--radius-lg);
  box-shadow: 0 6px 0 rgba(0,0,0,0.08);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 18px 10px;
  min-height: 150px;
  font-size: 18px;
  color: var(--ink);
  transition: transform .12s ease;
}
.tarjeta-actividad:active { transform: scale(0.94); }
.tarjeta-actividad .icono { font-size: 48px; line-height: 1; }

/* ---------- Barra superior de actividad ---------- */
.barra-actividad {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
  padding: 14px 20px;
  background: var(--card);
  box-shadow: 0 2px 10px rgba(0,0,0,0.06);
}

#titulo-actividad {
  flex: 1 1 auto;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  text-align: center;
  font-size: 16px;
}

.btn-volver {
  background: var(--ink);
  color: white;
  border-radius: 100px;
  padding: 14px 22px;
  font-size: 18px;
}

.btn-repetir-consigna {
  background: var(--violet);
  color: white;
  border-radius: 100px;
  padding: 14px 20px;
  font-size: 22px;
}

.info-nivel {
  font-size: 20px;
  color: var(--ink);
  background: var(--sun);
  padding: 10px 18px;
  border-radius: 100px;
}

.lienzo-juego {
  flex: 1;
  position: relative;
  overflow: hidden;
  background: #FFFDF8;
}

/* ---------- Objetivos táctiles ---------- */
.objetivo {
  position: absolute;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 32px;
  box-shadow: 0 4px 0 rgba(0,0,0,0.12);
}

/* ---------- Recompensas ---------- */
.overlay-recompensa {
  position: absolute;
  inset: 0;
  background: rgba(44,38,32,0.55);
  display: none;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 18px;
  z-index: 50;
}
.overlay-recompensa.activa { display: flex; }
.overlay-recompensa .mensaje {
  font-size: clamp(28px, 5vw, 48px);
  color: white;
  text-align: center;
}
.overlay-recompensa .estrellas { font-size: 56px; }
.btn-continuar {
  background: var(--leaf);
  color: white;
  border-radius: 100px;
  padding: 18px 36px;
  font-size: 24px;
}

.tarjeta-memoria {
  background: var(--teal);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 40px;
  color: white;
  box-shadow: 0 4px 0 rgba(0,0,0,0.12);
}
.tarjeta-memoria.volteada { background: white; color: var(--ink); }
.tarjeta-memoria.encontrada { background: var(--leaf); color: white; }

.burbuja {
  position: absolute;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 30%, rgba(255,255,255,0.9), rgba(47,191,174,0.55));
  box-shadow: 0 0 0 3px rgba(255,255,255,0.4) inset;
}

.zona-arrastre {
  position: absolute;
  border-radius: var(--radius-md);
  border: 4px dashed rgba(44,38,32,0.35);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 34px;
}
.zona-arrastre.acierto { border-style: solid; border-color: var(--leaf); background: rgba(111,207,122,0.18); }

.pieza-arrastrable {
  position: absolute;
  font-size: 44px;
  cursor: grab;
  touch-action: none;
}

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

/* ---------- Responsivo: celulares angostos ---------- */
@media (max-width: 480px) {
  #pantalla-inicio { padding: 14px; }
  .caja-nombre { padding: 26px 20px; gap: 12px; }
  .caja-nombre .icono-bienvenida { font-size: 44px; }
  .grid-avatares { grid-template-columns: repeat(4, 1fr); max-height: 130px; }
  .opcion-avatar { font-size: 24px; padding: 6px 0; }
  .encabezado h1 { font-size: 20px; }
  .btn-nuevo-estudiante { font-size: 12px; padding: 8px 12px; }
  .grid-actividades { grid-template-columns: repeat(auto-fill, minmax(120px, 1fr)); gap: 12px; }
  .tarjeta-actividad { min-height: 120px; font-size: 14px; padding: 12px 6px; }
  .tarjeta-actividad .icono { font-size: 36px; }
  .barra-actividad { padding: 10px 12px; }
  .btn-volver { padding: 10px 16px; font-size: 15px; }
  .btn-repetir-consigna { padding: 10px 14px; font-size: 18px; }
  .info-nivel { font-size: 15px; padding: 8px 12px; }
  .overlay-recompensa .estrellas { font-size: 40px; }
  .overlay-recompensa .mensaje { font-size: clamp(20px, 6vw, 32px); }
  .btn-continuar { padding: 14px 26px; font-size: 18px; }
}

/* ---------- Responsivo: poca altura (teclado abierto o celular en horizontal bajo) ---------- */
@media (max-height: 480px) {
  .caja-nombre { padding: 16px 24px; gap: 8px; }
  .caja-nombre .icono-bienvenida { font-size: 32px; }
  .caja-nombre h1 { font-size: 18px; }
  .grid-avatares { max-height: 90px; }
  #pantalla-inicio { padding: 10px; }
  .encabezado { margin-bottom: 4px; }
  .grid-actividades { gap: 10px; margin-top: 8px; }
  .tarjeta-actividad { min-height: 96px; padding: 8px 4px; }
  .tarjeta-actividad .icono { font-size: 28px; }
}

.footer-red {
  text-align: center;
  font-size: 12px;
  font-weight: 400;
  color: #9a9285;
  padding: 10px 6px;
}
.footer-red a { color: #9a9285; }