:root {
  --background-color-light: #ffffff;
  --text-color-light: #212529;
  --border-color-light: #dee2e6;
  --card-bg-light: #f8f9fa;

  --background-color-dark: #121212;
  --text-color-dark: #e9ecef;
  --border-color-dark: #495057;
  --card-bg-dark: #1e1e1e;
}

html {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
}

body {
  margin: 0;
  padding: 2rem;
  background-color: var(--background-color-dark);
  color: var(--text-color-dark);
  transition: background-color 0.3s, color 0.3s;
}

html[data-theme="light"] body {
    --background-color-dark: var(--background-color-light);
    --text-color-dark: var(--text-color-light);
    --border-color-dark: var(--border-color-light);
    --card-bg-dark: var(--card-bg-light);
}

.container {
  max-width: 1200px;
  margin: 0 auto;
}

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2rem;
}

header h1 {
    font-size: 2rem;
}

#theme-toggle {
  padding: 0.5rem 1rem;
  border: 1px solid var(--border-color-dark);
  background-color: transparent;
  color: var(--text-color-dark);
  cursor: pointer;
  border-radius: 5px;
  transition: background-color 0.2s, color 0.2s;
}

#theme-toggle:hover {
    background-color: var(--text-color-dark);
    color: var(--background-color-dark);
}

.summary-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.card {
  background-color: var(--card-bg-dark);
  padding: 1.5rem;
  border-radius: 8px;
  border: 1px solid var(--border-color-dark);
}

.card h2 {
  margin-top: 0;
  font-size: 1.2rem;
  color: #adb5bd;
}

.card p {
  font-size: 2rem;
  font-weight: bold;
  margin: 0;
}

.data-table-section .table-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

#add-data-btn {
  padding: 0.6rem 1.2rem;
  background-color: #007bff;
  color: white;
  border: none;
  border-radius: 5px;
  cursor: pointer;
  font-size: 1rem;
}

#add-data-btn:hover {
    background-color: #0056b3;
}

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

th, td {
  padding: 1rem;
  text-align: left;
  border-bottom: 1px solid var(--border-color-dark);
}

thead th {
  background-color: var(--card-bg-dark);
}

/* Modal Styles */
.modal {
  display: none;
  position: fixed;
  z-index: 1000;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  overflow: auto;
  background-color: rgba(0, 0, 0, 0.7);
}

.modal-content {
  background-color: var(--card-bg-dark);
  margin: 10% auto;
  padding: 2rem;
  border: 1px solid var(--border-color-dark);
  width: 80%;
  max-width: 500px;
  border-radius: 8px;
  position: relative;
}

.close-btn {
  color: #aaa;
  position: absolute;
  top: 1rem;
  right: 1.5rem;
  font-size: 2rem;
  font-weight: bold;
  cursor: pointer;
}

.close-btn:hover,
.close-btn:focus {
  color: var(--text-color-dark);
}

#data-form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

#data-form label {
    font-weight: bold;
}

#data-form input, #data-form select {
    padding: 0.8rem;
    background-color: #333;
    border: 1px solid var(--border-color-dark);
    color: var(--text-color-dark);
    border-radius: 4px;
}

#data-form button[type="submit"] {
    padding: 0.8rem;
    background-color: #007bff;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 1rem;
    margin-top: 1rem;
}

#data-form button[type="submit"]:hover {
    background-color: #0056b3;
}

#search-bar {
    padding: 0.6rem 1rem;
    background-color: #333;
    border: 1px solid var(--border-color-dark);
    color: var(--text-color-dark);
    border-radius: 5px;
    width: 300px;
    font-size: 1rem;
}

.table-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.table-actions {
    display: flex;
    gap: 1rem;
}

.button {
    padding: 0.6rem 1.2rem;
    background-color: #0d6efd;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 1rem;
    text-align: center;
}

.button:hover {
    background-color: #0a58ca;
}

.error-message {
    color: #dc3545; /* Red color */
    font-weight: bold;
    margin-top: 1rem;
}