/* General Styles */
body {
  font-family: 'Arial', sans-serif;
  background: linear-gradient(135deg, #1a1a2e, #16213e);
  margin: 0;
  padding: 20px;
  color: #fff;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
}

.container {
  max-width: 800px;
  width: 100%;
  padding: 20px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 15px;
  backdrop-filter: blur(10px);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

h1 {
  text-align: center;
  font-size: 2.5rem;
  color: #00d1ff;
  text-shadow: 0 0 10px #00d1ff, 0 0 20px #00d1ff;
  margin-bottom: 20px;
}

/* Calendar Grid */
#calendar {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 10px;
  margin-bottom: 20px;
}

.day {
  padding: 15px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  text-align: center;
  cursor: pointer;
  background: rgba(0, 0, 0, 0.3);
  border-radius: 10px;
  transition: transform 0.3s ease, background 0.3s ease, box-shadow 0.3s ease;
}

.day:hover {
  transform: translateY(-5px);
  background: rgba(0, 209, 255, 0.2);
  box-shadow: 0 4px 15px rgba(0, 209, 255, 0.4);
}

.day.selected {
  background: linear-gradient(135deg, #00d1ff, #8a2be2);
  color: white;
  box-shadow: 0 4px 15px rgba(0, 209, 255, 0.6);
}

/* Notes Section */
.notes-section {
  margin-top: 20px;
}

.notes-section h2 {
  font-size: 1.5rem;
  color: #00d1ff;
  text-shadow: 0 0 10px #00d1ff, 0 0 20px #00d1ff;
}

input[type="date"], textarea {
  width: 100%;
  padding: 10px;
  margin-top: 10px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 10px;
  background: rgba(0, 0, 0, 0.3);
  color: #fff;
  font-size: 1rem;
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

input[type="date"]:focus, textarea:focus {
  border-color: #00d1ff;
  box-shadow: 0 0 10px rgba(0, 209, 255, 0.6);
  outline: none;
}

textarea {
  height: 100px;
  resize: none;
}

button {
  display: block;
  margin-top: 10px;
  padding: 10px 20px;
  background: linear-gradient(135deg, #00d1ff, #8a2be2);
  color: white;
  border: none;
  border-radius: 10px;
  cursor: pointer;
  font-size: 1rem;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

button:hover {
  transform: translateY(-3px);
  box-shadow: 0 4px 15px rgba(0, 209, 255, 0.6);
}

/* Responsive Design */
@media (max-width: 768px) {
  h1 {
    font-size: 2rem;
  }

  #calendar {
    grid-template-columns: repeat(5, 1fr);
  }

  .day {
    padding: 10px;
    font-size: 0.9rem;
  }

  .notes-section h2 {
    font-size: 1.2rem;
  }

  input[type="date"], textarea, button {
    font-size: 0.9rem;
  }
}

@media (max-width: 480px) {
  h1 {
    font-size: 1.5rem;
  }

  #calendar {
    grid-template-columns: repeat(3, 1fr);
  }

  .day {
    padding: 8px;
    font-size: 0.8rem;
  }

  .notes-section h2 {
    font-size: 1rem;
  }

  input[type="date"], textarea, button {
    font-size: 0.8rem;
  }
}