:root {
  --primary-color: #1a73e8;
  --secondary-color: #f8f9fa;
  --text-color: #202124;
  --border-color: #dadce0;
}

body {
  font-family: 'Roboto', Arial, sans-serif;
  margin: 0;
  padding: 0;
  background-color: white;
  color: var(--text-color);
}

header {
  background-color: white;
  box-shadow: 0 1px 2px rgba(0,0,0,0.1);
  padding: 16px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: sticky;
  top: 0;
  z-index: 100;
}

.logo {
  font-size: 1.5rem;
  font-weight: 500;
  color: var(--primary-color);
}

nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 24px;
  align-items: center;
}

nav a {
  color: var(--text-color);
  text-decoration: none;
  font-weight: 500;
  padding: 8px 12px;
  border-radius: 4px;
  transition: all 0.2s;
}

nav a.active {
  color: var(--primary-color);
  background-color: var(--secondary-color);
}

nav a:hover {
  background-color: var(--secondary-color);
}

.main-container {
  max-width: 1200px;
  margin: 80px auto 24px;
  padding: 0 24px;
}

h1 {
  color: #333;
  text-align: center;
  margin-bottom: 30px;
}

.container {
  max-width: 800px;
  margin: 0 auto;
  background: white;
  padding: 20px;
  border-radius: 8px;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

form {
  margin-bottom: 20px;
}

input[type="text"],
input[type="number"],
input[type="file"] {
  padding: 8px;
  margin-right: 10px;
  border: 1px solid #ddd;
  border-radius: 4px;
}

button {
  padding: 8px 16px;
  background-color: #007bff;
  color: white;
  border: none;
  border-radius: 4px;
  cursor: pointer;
}

button:hover {
  background-color: #0056b3;
}

.table-container {
  overflow-x: auto;
  margin: 20px 0;
}

table {
  width: auto;
  min-width: 100%;
  border-collapse: collapse;
}

th, td {
  padding: 8px;
  text-align: left;
  border-bottom: 1px solid #ddd;
  white-space: nowrap;
}

th {
  background-color: #f8f9fa;
}

.nav-links {
  margin-top: 20px;
  text-align: center;
}

.nav-links a {
  margin: 0 10px;
  color: #007bff;
  text-decoration: none;
}

.nav-links a:hover {
  text-decoration: underline;
}

.results {
  margin-top: 30px;
}

/* Authentication styles */
.auth-container {
  max-width: 400px;
  margin: 50px auto;
  padding: 20px;
  background: white;
  border-radius: 8px;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.auth-container h1 {
  text-align: center;
  margin-bottom: 20px;
}

.form-group {
  margin-bottom: 15px;
}

.form-group label {
  display: block;
  margin-bottom: 5px;
}

.form-group input {
  width: 100%;
  padding: 8px;
  border: 1px solid var(--border-color);
  border-radius: 4px;
}

.message {
    padding: 12px;
    border-radius: 4px;
    margin-bottom: 15px;
    display: block;
    opacity: 1;
    transition: opacity 0.3s ease;
    position: relative;
    animation: fadeIn 0.5s ease, fadeOut 1s ease 3s forwards;
    visibility: visible;
}

@keyframes fadeOut {
    from { opacity: 1; }
    to { opacity: 0; visibility: hidden; }
}

.message.success,
.alert-success {
    color: #155724;
    background-color: #d4edda;
    border: 1px solid #c3e6cb;
    padding: 12px;
    text-align: center;
    border-radius: 4px;
    margin: 10px 0;
    display: block;
    width: 100%;
    box-sizing: border-box;
}

.message.error {
    color: #dc3545;
    background-color: #f8d7da;
    border: 1px solid #f5c6cb;
}

.error,
.error-message,
.alert-danger {
    color: #dc3545;
    background-color: #f8d7da;
    padding: 10px;
    border-radius: 4px;
    margin-bottom: 15px;
    border: 1px solid #f5c6cb;
    display: block !important;
    opacity: 1;
    transition: opacity 0.3s ease;
    position: relative;
    animation: fadeIn 0.5s ease;
    visibility: visible !important;
}

.error.hidden,
.alert-danger.hidden {
    display: none;
    visibility: hidden;
}

.error:not(.hidden),
.alert-danger:not(.hidden) {
    display: block !important;
    visibility: visible !important;
    opacity: 1 !important;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
}

.auth-container p {
  text-align: center;
  margin-top: 15px;
}

.auth-container a {
  color: var(--primary-color);
  text-decoration: none;
}

.auth-container a:hover {
  text-decoration: underline;
}

/* User management styles */
.user-management .table-container {
  margin-top: 20px;
}

.user-management table {
  width: 100%;
}

.user-management th {
  background-color: var(--primary-color);
  color: white;
}

.user-management .btn-edit,
.user-management .btn-delete {
  padding: 4px 8px;
  margin: 0 4px;
  font-size: 0.9rem;
}

.user-management .btn-edit {
  background-color: #28a745;
}

.user-management .btn-edit:hover {
  background-color: #218838;
}

.user-management .btn-delete {
  background-color: #dc3545;
}

.user-management .btn-delete:hover {
  background-color: #c82333;
}

/* Admin nav item */
nav a.admin-only {
  display: none;
}

nav a.admin-only.visible {
  display: inline-block;
}

/* Two column layout */
.two-column-layout {
  display: flex;
  gap: 40px;
  margin-top: 30px;
}

.left-column {
  flex: 1;
  padding: 20px;
  background: white;
  border-radius: 8px;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.right-column {
  width: 400px;
  padding: 20px;
  background: white;
  border-radius: 8px;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.right-column .auth-container {
  margin: 0;
  box-shadow: none;
  padding: 0;
}

.right-column h2 {
  margin-bottom: 20px;
  color: var(--primary-color);
}