:root {
  --color-primary: #4CAF50;
  --color-secondary: #FF9800;
  --color-danger: #F44336;
  --color-text: #333;
  --color-light: #f8f8f8;
  --color-dark: #2E7D32;
  --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  --transition: all 0.3s ease;
}

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

body {
  font-family: 'Poppins', sans-serif;
  background-color: #E8F5E9;
  margin: 0;
  padding: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  color: var(--color-text);
  overflow: hidden;
  position: relative;
}

.background-animation {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, #E8F5E9 0%, #C8E6C9 100%);
  z-index: -1;
}

/* ===== Registro ===== */
.registro {
  background: rgba(255, 255, 255, 0.95);
  padding: 2rem;
  border-radius: 20px;
  box-shadow: var(--shadow);
  text-align: center;
  width: 95%;
  max-width: 520px;
  border: 2px solid var(--color-primary);
}

.registro h1 {
  color: var(--color-primary);
  margin-bottom: 0.5rem;
  font-size: 2rem;
}

.registro-desc {
  margin-bottom: 1rem;
  color: #4d4d4d;
}

.registro-form {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.6rem;
  align-items: center;
}

#nombre-jugador {
  padding: 0.8rem 1rem;
  border: 2px solid #c8e6c9;
  border-radius: 12px;
  outline: none;
  font-size: 1rem;
}

#nombre-jugador:focus {
  border-color: var(--color-primary);
}

.registro-msg {
  display: block;
  margin-top: 0.6rem;
  color: var(--color-danger);
  min-height: 1.25rem;
}

/* ===== Juego ===== */
#game-container {
  background: rgba(255, 255, 255, 0.95);
  padding: 2rem;
  border-radius: 20px;
  box-shadow: var(--shadow);
  text-align: center;
  width: 95%;
  max-width: 600px;
  position: relative;
  overflow: hidden;
  border: 2px solid var(--color-primary);
}

#header {
  display: flex;
  justify-content: space-between;
  margin-bottom: 1.5rem;
}

#vidas {
  font-size: 1.5rem;
  color: var(--color-danger);
}

#puntos {
  font-weight: 600;
  color: var(--color-dark);
}

#puntos span {
  color: var(--color-primary);
}

h1 {
  color: var(--color-primary);
  margin-bottom: 1rem;
  font-size: 2rem;
}

#progress-container {
  width: 100%;
  height: 10px;
  background-color: #e0e0e0;
  border-radius: 5px;
  margin: 1rem 0;
  overflow: hidden;
}

#progress-bar {
  height: 100%;
  width: 0%;
  background-color: var(--color-primary);
  transition: var(--transition);
}

#nivel-info {
  font-size: 1.1rem;
  color: var(--color-dark);
  margin-bottom: 1rem;
  font-weight: 600;
}

#pregunta {
  font-size: 1.3rem;
  margin: 1.5rem 0;
  font-weight: 600;
}

#opciones {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  margin: 2rem 0;
}

.opcion {
  cursor: pointer;
  padding: 1rem;
  border: 2px solid #ddd;
  border-radius: 12px;
  transition: var(--transition);
  font-size: 1.1rem;
  background-color: white;
  box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.opcion:hover {
  transform: translateY(-3px);
  box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}

#feedback {
  margin: 1.5rem 0;
  min-height: 80px;
}

#feedback-text {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

#explicacion {
  font-size: 0.9rem;
  color: #666;
}

#timer-container {
  width: 100%;
  height: 8px;
  background-color: #e0e0e0;
  border-radius: 4px;
  margin: 1rem 0;
  overflow: hidden;
}

#timer-bar {
  height: 100%;
  width: 100%;
  background-color: var(--color-secondary);
  transition: width 0.1s linear;
}

#podio {
  margin-top: 2rem;
  background-color: #f1f8e9;
  padding: 1rem;
  border-radius: 12px;
  border: 2px solid var(--color-primary);
}

.tabla-podio {
  width: 100%;
  margin-top: 1rem;
  border-collapse: collapse;
  font-size: 1rem;
}

.tabla-podio th, .tabla-podio td {
  padding: 0.6rem;
  border: 1px solid #c8e6c9;
  text-align: center;
}

.tabla-podio th {
  background-color: var(--color-primary);
  color: white;
}

.fila-actual {
  outline: 3px solid var(--color-secondary);
  background: #fffde7;
}

.btn {
  background-color: var(--color-primary);
  color: white;
  border: none;
  padding: 0.8rem 2rem;
  font-size: 1rem;
  border-radius: 50px;
  cursor: pointer;
  transition: var(--transition);
  font-weight: 600;
  margin-top: 1rem;
  box-shadow: var(--shadow);
}

.btn:hover {
  background-color: var(--color-dark);
  transform: translateY(-2px);
}

.btn:active {
  transform: translateY(0);
}

#game-over {
  padding: 2rem;
}

#game-over h2 {
  color: var(--color-primary);
  margin-bottom: 1.5rem;
  font-size: 2rem;
}

#final-score, #record {
  font-size: 1.3rem;
  margin: 1rem 0;
  font-weight: 600;
}

#final-score span, #record span {
  color: var(--color-primary);
}

/* Efectos para respuestas */
.correcta {
  background-color: #E8F5E9 !important;
  border-color: var(--color-primary) !important;
  color: var(--color-primary);
  animation: pulse 0.5s;
}

.incorrecta {
  background-color: #FFEBEE !important;
  border-color: var(--color-danger) !important;
  color: var(--color-danger);
}

@keyframes pulse {
  0% { transform: scale(1); }
  50% { transform: scale(1.05); }
  100% { transform: scale(1); }
}

/* Responsive */
@media (max-width: 600px) {
  #game-container {
    padding: 1.5rem;
    width: 100%;
    border-radius: 0;
    min-height: 100vh;
  }
  
  #opciones {
    grid-template-columns: 1fr;
  }
  
  h1 {
    font-size: 1.8rem;
  }

  .registro-form {
    grid-template-columns: 1fr;
  }
}