:root {
  --primary-color: #007bff;
  --primary-hover-color: #0056b3;
  --success-color: #28a745;
  --success-hover-color: #218838;
  --danger-color: #dc3545;
  --danger-hover-color: #c82333;
  --secondary-color: #6c757d;
  --secondary-hover-color: #5a6268;
  --light-gray-color: #f8f9fa;
  --medium-gray-color: #dee2e6;
  --dark-gray-color: #495057;
  --text-color: #212529;
  --white-color: #fff;
  --font-family: 'Noto Sans SC', sans-serif;
  --border-radius: 8px;
  --box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

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

body {
  font-family: var(--font-family);
  background-color: var(--light-gray-color);
  color: var(--text-color);
  line-height: 1.6;
}

#root {
  max-width: 800px;
  margin: 2rem auto;
  padding: 1rem;
}

h1, h2 {
  color: var(--dark-gray-color);
  margin-bottom: 1rem;
  font-weight: 700;
}

h1 {
  text-align: center;
  font-size: 2.5rem;
  margin-bottom: 2rem;
}

h2 {
  font-size: 1.75rem;
  border-bottom: 2px solid var(--primary-color);
  padding-bottom: 0.5rem;
}

.card {
  background-color: var(--white-color);
  border-radius: var(--border-radius);
  box-shadow: var(--box-shadow);
  padding: 1.5rem;
  margin-bottom: 2rem;
}

.form-group, .user-management-form .form-group {
  margin-bottom: 0; /* Reset margin for grid layout */
  display: flex;
  flex-direction: column;
}

label {
  margin-bottom: 0.5rem;
  font-weight: 500;
}

input[type="text"],
input[type="number"],
select {
  width: 100%;
  padding: 0.75rem;
  border: 1px solid var(--medium-gray-color);
  border-radius: var(--border-radius);
  font-size: 1rem;
  font-family: var(--font-family);
  transition: border-color 0.2s;
}

.edit-input {
  max-width: 80px;
  padding: 0.5rem;
  text-align: center;
}

input[type="text"]:focus,
input[type="number"]:focus,
select:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 2px rgba(0, 123, 255, 0.25);
}

.button {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: var(--border-radius);
  font-size: 1rem;
  font-weight: 500;
  font-family: var(--font-family);
  cursor: pointer;
  text-align: center;
  text-decoration: none;
  transition: background-color 0.2s, transform 0.1s;
}

.button:hover {
  transform: translateY(-1px);
}

.button-primary {
  background-color: var(--primary-color);
  color: var(--white-color);
}
.button-primary:hover {
  background-color: var(--primary-hover-color);
}

.button-danger {
  background-color: var(--danger-color);
  color: var(--white-color);
}
.button-danger:hover {
    background-color: var(--danger-hover-color);
}

.button-success {
    background-color: var(--success-color);
    color: var(--white-color);
}
.button-success:hover {
    background-color: var(--success-hover-color);
}

.button-secondary {
    background-color: var(--secondary-color);
    color: var(--white-color);
}
.button-secondary:hover {
    background-color: var(--secondary-hover-color);
}

.button-edit {
    background-color: var(--secondary-color);
    color: var(--white-color);
}
.button-edit:hover {
    background-color: var(--secondary-hover-color);
}


.checkin-form {
  display: grid;
  grid-template-columns: 1fr 1fr auto;
  gap: 1rem;
  align-items: flex-end;
}

.user-management-form {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 1rem;
    align-items: flex-end;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 1rem;
}

th, td {
  padding: 0.75rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--medium-gray-color);
  vertical-align: middle;
}

th {
  background-color: var(--light-gray-color);
  font-weight: 700;
}

tbody tr:nth-child(even) {
  background-color: #fdfdfd;
}

.rank-cell {
    font-weight: 700;
    font-size: 1.1rem;
    text-align: center !important;
    color: var(--primary-color);
}

.status-checked-in {
  color: var(--success-color);
  font-weight: 500;
}

.status-not-checked-in {
  color: var(--danger-color);
  font-weight: 500;
}

details {
  border-radius: var(--border-radius);
  border: 1px solid var(--medium-gray-color);
  margin-bottom: 2rem;
  background-color: var(--white-color);
}
details:last-child {
    margin-bottom: 0;
}


summary {
  font-size: 1.5rem;
  font-weight: 500;
  padding: 1rem 1.5rem;
  cursor: pointer;
  transition: background-color 0.2s;
  list-style: revert; /* Use default triangle marker */
}

summary:hover {
  background-color: var(--light-gray-color);
}

details[open] > summary {
  border-bottom: 1px solid var(--medium-gray-color);
}

details > .card {
  box-shadow: none;
  border-top: none;
  margin-bottom: 0;
  padding-top: 0;
  border-radius: 0 0 var(--border-radius) var(--border-radius);
}

.manage-user-cell {
    width: 180px;
    text-align: center !important;
}

.action-buttons {
    display: flex;
    gap: 0.5rem;
    justify-content: center;
}
.action-buttons .button {
    padding: 0.4rem 0.8rem;
    font-size: 0.9rem;
}

.export-button {
    margin-top: 1.5rem;
    width: auto;
}

.chart-container {
    width: 100%;
    margin-top: 1.5rem;
}

.chart-container svg {
    width: 100%;
    height: auto;
    font-size: 12px;
}
.chart-container svg text {
    fill: var(--dark-gray-color);
}
.chart-container svg circle:hover {
    r: 6;
    fill: var(--danger-color);
}


/* Responsive Design */
@media (max-width: 768px) {
  #root {
    margin: 1rem auto;
    padding: 0.5rem;
  }
  
  h1 { font-size: 2rem; }
  h2 { font-size: 1.5rem; }
  summary { font-size: 1.25rem; }
  
  .card, details > .card {
    padding: 1rem;
  }
  
  .checkin-form, .user-management-form {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .checkin-form .button, .user-management-form .button {
      width: 100%;
  }

  table {
    font-size: 0.9rem;
  }
  th, td {
      padding: 0.5rem;
  }

  .manage-user-cell {
      width: auto;
  }
  .action-buttons {
      flex-direction: column;
  }
}