/* General */
body {
  margin: 0;
  padding: 0;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background-color: #f0f8ff;
  color: #333;
}

h1, h2 {
  color: #007acc;
  text-align: center;
  margin-top: 20px;
}

button {
  background-color: #00bfa6;
  color: white;
  border: none;
  padding: 10px 20px;
  margin: 8px;
  font-size: 1rem;
  border-radius: 8px;
  cursor: pointer;
  transition: background-color 0.3s ease;
}

button:hover {
  background-color: #009e8a;
}

/* Pomodoro */
.pomodoro-body {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
  min-height: 100vh;
  padding: 20px;
  background-color: #e6f7ff;
}

.center-container {
  text-align: center;
}

.timer {
  font-size: 5rem;
  margin: 20px 0;
  color: #007acc;
}

.controls button {
  margin: 0 10px;
}

/* Materias */
.materia-card {
  background: white;
  padding: 15px;
  margin: 10px auto;
  width: 90%;
  max-width: 400px;
  border-radius: 10px;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.1);
}

.materia-card h3 {
  margin: 0;
  color: #007acc;
}

/* PDF */
.pdf-container {
  text-align: center;
  padding: 20px;
}

#pdf-list {
  margin-top: 10px;
  padding: 10px;
  width: 80%;
  max-width: 400px;
}

/* Calendario */
#calendario {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 5px;
  padding: 20px;
  max-width: 700px;
  margin: auto;
}

.dia {
  background: #e0f7fa;
  border: 1px solid #b2ebf2;
  padding: 20px;
  text-align: center;
  cursor: pointer;
  transition: background-color 0.3s ease;
}

.dia:hover {
  background: #b2ebf2;
}

.dia.con-nota {
  background-color: #a5d6a7 !important;
}

/* Horario */
.horario-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 10px;
  padding: 20px;
  text-align: center;
}

.horario-grid div {
  padding: 10px;
  background-color: #f0f8ff;
  border: 1px solid #ccc;
}

/* Botón volver */
.back-button {
  display: block;
  text-align: center;
  margin: 30px auto;
  color: #007acc;
  font-weight: bold;
  text-decoration: none;
  font-size: 1.1rem;
}

.back-button:hover {
  text-decoration: underline;
}

/* Responsive iPad */
@media (max-width: 900px) {
  .timer {
    font-size: 3rem;
  }

  .controls button {
    margin: 5px;
    font-size: 0.9rem;
  }

  .materia-card {
    width: 95%;
  }

  #calendario {
    grid-template-columns: repeat(4, 1fr);
  }

  .horario-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}