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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
  background-color: #eef1f5;
  padding: 1rem;
  color: #333;
  line-height: 1.6;
}

.login-box, .dashboard {
  background: white;
  max-width: 500px; 
  margin: 2rem auto; 
  padding: 1.5rem;
  border-radius: 10px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

h1, h2, h3 {
  text-align: center;
  color: #2a7de1;
  margin-bottom: 1rem;
}

h1 {
  font-size: 2rem;
  margin-bottom: 0.5rem;
}

h2 {
  font-size: 1.5rem;
  color: #555;
  margin-bottom: 1.5rem;
}

h3 {
  font-size: 1.2rem;
  color: #333;
  border-bottom: 1px solid #eee;
  padding-bottom: 0.5rem;
  margin-top: 1rem;
}

input[type="text"], 
input[type="password"], 
input[type="number"], 
input[type="time"] {
  width: 100%;
  padding: 0.8rem;
  margin-bottom: 1rem; 
  border: 1px solid #ccc;
  border-radius: 5px;
  font-size: 1rem; 
  -webkit-appearance: none; 
  -moz-appearance: none;
  appearance: none;
}

input:focus {
  outline: none;
  border-color: #2a7de1;
  box-shadow: 0 0 0 2px rgba(42, 125, 225, 0.2);
}

button {
  width: 100%;
  padding: 1rem; 
  background-color: #2a7de1;
  color: white;
  border: none;
  border-radius: 5px;
  cursor: pointer;
  font-size: 1rem; 
  font-weight: bold;
  margin-bottom: 1rem;
  transition: background-color 0.2s ease;
}

#sendEmailButton {
  background-color: #007bff; /* A standard blue for info/action */
}

#sendEmailButton:hover, #sendEmailButton:focus {
  background-color: #0069d9;
}

#sendEmailButton:active {
  background-color: #005cbf;
}

button:hover, button:focus {
  background-color: #2166b3;
}

button:active {
  background-color: #1c5699;
}

.save-data-button {
  background-color: #5cb85c; 
  margin-top: 1rem; 
}

.save-data-button:hover, .save-data-button:focus {
  background-color: #4cae4c;
}

.save-data-button:active {
  background-color: #449d44;
}

.panel {
  margin-top: 1.5rem;
  padding: 1rem;
  background: #f9fafb; 
  border-radius: 8px;
  border: 1px solid #e0e0e0;
}

.student {
  margin-bottom: 1.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid #eee;
}

.student:last-child {
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom: none;
}

label {
  font-weight: bold;
  display: block;
  margin-bottom: 0.3rem; 
  margin-top: 1rem; 
  font-size: 0.9rem;
  color: #444;
}

.nav-button.active {
  background-color: #1c5699; 
  box-shadow: inset 0 2px 4px rgba(0,0,0,0.2);
}