body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  margin: 0;
  padding: 0;
  background: linear-gradient(to bottom right, #e0f7fa, #fff3e0);
  color: #333;
}

.container {
  max-width: 900px;
  margin: auto;
  padding: 20px;
  background: white;
  border-radius: 15px;
  box-shadow: 0 0 15px rgba(0, 0, 0, 0.1);
}

h1, h2 {
  text-align: center;
  color: #0d47a1;
}

#registro {
  text-align: center;
  margin-bottom: 20px;
}

input[type="text"] {
  padding: 12px;
  width: 60%;
  margin-right: 10px;
  border: 1px solid #ccc;
  border-radius: 8px;
  font-size: 1em;
}

button {
  padding: 12px 25px;
  background-color: #2196f3;
  color: white;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  margin: 10px 5px;
  font-size: 1em;
  transition: background-color 0.3s, transform 0.2s;
}

button:hover:not(:disabled) {
  background-color: #1565c0;
  transform: scale(1.05);
}

button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

#tabla-ejercicios {
  width: 100%;
  border-collapse: collapse;
  margin-top: 20px;
  background-color: #f9f9f9;
  border-radius: 10px;
  overflow: hidden;
}

th {
  background-color: #1976d2;
  color: white;
  padding: 12px;
}

td {
  border: 1px solid #ccc;
  padding: 12px;
}

select {
  width: 100%;
  padding: 10px;
  border-radius: 6px;
  font-size: 1em;
  border: 1px solid #ccc;
}

.botones {
  text-align: center;
  margin-top: 25px;
}

#retroalimentacion {
  margin-top: 25px;
  padding: 15px;
  background-color: #e3f2fd;
  border-left: 5px solid #1e88e5;
  border-radius: 10px;
  font-size: 1em;
  line-height: 1.5em;
}

#puntuacion-container {
  background-color: #ffeb3b;
  color: #000;
  font-weight: bold;
  text-align: center;
  padding: 15px;
  border: 3px solid #fbc02d;
  border-radius: 12px;
  font-size: 1.5em;
  margin: 10px auto 25px;
  max-width: 300px;
  box-shadow: 0 0 10px rgba(251, 192, 45, 0.5);
}

@media screen and (max-width: 600px) {
  input[type="text"] {
    width: 90%;
    margin-bottom: 10px;
  }

  button {
    width: 90%;
  }

  select {
    font-size: 0.95em;
  }

  #puntuacion-container {
    font-size: 1.3em;
    max-width: 90%;
  }
}