/* ======= General Styling ======= */
body {
  font-family: "Segoe UI", Arial, sans-serif;
  margin: 0;
  padding: 0;
  background: #eef2f3;
  color: #222;
}

header {
  background: #2471a3;
  color: #fff;
  padding: 2rem;
  text-align: center;
}

main {
  max-width: 800px;
  margin: 2rem auto;
  padding: 1rem;
  background: #fff;
  box-shadow: 0 2px 10px rgba(36, 113, 163, 0.09);
  border-radius: 8px;
}

.form-section {
  margin-bottom: 2rem;
  padding: 1rem;
}

.form-section form {
  display: grid;
  gap: 1rem;
  grid-template-columns: 1fr 1fr;
}

.form-section label {
  display: flex;
  flex-direction: column;
  font-size: 1rem;
}

#submitBtn {
  grid-column: 1/3;
  padding: 0.5rem;
  font-size: 1rem;
  background: #2471a3;
  color: #fff;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  transition: background 0.2s;
}
#submitBtn:hover {
  background: #145a8b;
}

.error {
  color: red;
  margin-top: 0.5rem;
}

/* ======= Registered Students Table ======= */
.display-section {
  margin-top: 2rem;
}
.table-container {
  max-height: 350px; /* Applies scroll if needed */
  overflow-y: auto;
  border: 1px solid #dedede;
}

/* Table styling */
table {
  width: 100%;
  border-collapse: collapse;
  background: #fafbfc;
}
th,
td {
  border-bottom: 1px solid #eee;
  padding: 0.75rem;
  text-align: left;
}
/* Actions buttons */
.action-btn {
  padding: 0.3em 0.6em;
  margin: 0 0.3em;
  border: none;
  border-radius: 3px;
  cursor: pointer;
  font-size: 1em;
}
.edit-btn {
  background: #ffbe76;
}
.delete-btn {
  background: #eb4d4b;
  color: #fff;
}

/* ======= Responsive Design ======= */
/* Mobile */
@media (max-width: 640px) {
  main {
    padding: 0.5rem;
  }
  .form-section form {
    grid-template-columns: 1fr;
  }
  th,
  td {
    padding: 0.5rem;
    font-size: 0.95em;
  }
}
@media (min-width: 641px) and (max-width: 1024px) {
  main {
    width: 95%;
    padding: 1rem;
  }
  .form-section form {
    grid-template-columns: 1fr 1fr;
  }
}
/* Desktop */
@media (min-width: 1025px) {
  main {
    width: 800px;
    padding: 1rem 4rem;
  }
}