/* Modern Style Update - Red Delta Systems CMS */
:root {
  /* Theme colors - Light mode (default) */
  --primary-color: #e53935;
  --primary-dark: #c62828;
  --secondary-color: #2c3e50;
  --secondary-dark: #1a2530;
  --background-color: #f8f9fa;
  --card-background: #ffffff;
  --text-color: #333333;
  --text-muted: #6c757d;
  --border-color: #dee2e6;
  
  /* Common colors */
  --light-color: #f8f9fa;
  --gray-light: #e9ecef;
  --gray-medium: #dee2e6;
  --gray-dark: #495057;
  --success-color: #28a745;
  --warning-color: #ffc107;
  --danger-color: #dc3545;
  
  /* Effects */
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.1);
  --border-radius: 8px;
  --transition-speed: 0.3s;
}

/* Dark mode theme */
[data-theme="dark"] {
  --primary-color: #ff5252;
  --primary-dark: #e53935;
  --secondary-color: #34495e;
  --secondary-dark: #2c3e50;
  --background-color: #121212;
  --card-background: #1e1e1e;
  --text-color: #f8f9fa;
  --text-muted: #adb5bd;
  --border-color: #343a40;
  
  /* Adjust shadows for dark mode */
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.4);
}

/* General Styles */
body {
  font-family: 'Inter', 'Segoe UI', -apple-system, BlinkMacSystemFont, sans-serif;
  margin: 0;
  padding: 0;
  background-color: var(--background-color);
  color: var(--text-color);
  line-height: 1.6;
  transition: background-color var(--transition-speed) ease,
              color var(--transition-speed) ease;
}

.container {
  width: 90%;
  max-width: 1200px;
  margin: auto;
  overflow: hidden;
  padding: 0 20px;
}

/* Header Styles */
header {
  background: var(--secondary-color);
  color: var(--light-color);
  padding: 15px 0;
  box-shadow: var(--shadow-md);
  position: sticky;
  top: 0;
  z-index: 1000;
  transition: background-color var(--transition-speed) ease;
}

header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: relative;
}

/* Theme toggle button in header is removed */

header #logo {
  margin: 0;
  font-size: 28px;
  font-weight: 700;
  color: var(--primary-color);
  letter-spacing: -0.5px;
}

header nav ul {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
}

header nav ul li {
  padding: 0 15px;
}

header nav ul li a {
  color: var(--light-color);
  text-decoration: none;
  font-weight: 500;
  font-size: 16px;
  transition: all var(--transition-speed) ease;
  padding: 8px 0;
  position: relative;
}

header nav ul li a::after {
  content: '';
  position: absolute;
  width: 0;
  height: 2px;
  bottom: 0;
  left: 0;
  background-color: var(--primary-color);
  transition: width var(--transition-speed) ease;
}

header nav ul li a:hover::after {
  width: 100%;
}

header nav ul li a.nav-active {
  color: var(--primary-color);
  font-weight: 600;
}

header nav ul li a.nav-active::after {
  width: 100%;
}

/* Main Content Styles */
main {
  padding: 30px 0;
}

main section {
  padding: 20px 0;
  display: none;
}

main section.active {
  display: block;
  animation: fadeIn 0.5s ease;
}

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

main section h2 {
  color: var(--secondary-color);
  margin-bottom: 25px;
  font-weight: 600;
  position: relative;
  padding-bottom: 10px;
}

main section h2::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 50px;
  height: 3px;
  background-color: var(--primary-color);
}

/* Card Styles */
.card {
  background-color: var(--card-background);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-sm);
  padding: 25px;
  margin-bottom: 25px;
  transition: box-shadow var(--transition-speed) ease,
              background-color var(--transition-speed) ease;
}

.card:hover {
  box-shadow: var(--shadow-md);
}

.card h3 {
  margin-top: 0;
  color: var(--secondary-color);
  font-weight: 600;
}

/* Form Styles */
form div {
  margin-bottom: 20px;
}

form label {
  display: block;
  margin-bottom: 8px;
  font-weight: 500;
  color: var(--secondary-color);
}

form input[type="text"],
form input[type="tel"],
form input[type="email"],
form input[type="password"],
form select,
form textarea {
  width: 100%;
  padding: 12px 15px;
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  box-sizing: border-box;
  font-family: inherit;
  font-size: 16px;
  background-color: var(--card-background);
  color: var(--text-color);
  transition: border-color var(--transition-speed) ease,
              box-shadow var(--transition-speed) ease,
              background-color var(--transition-speed) ease,
              color var(--transition-speed) ease;
}

form input:focus,
form select:focus,
form textarea:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(var(--primary-rgb, 229, 57, 53), 0.1);
}

form textarea {
  height: 100px;
  resize: vertical;
}

/* Checkbox Styles - Modern Look */
input[type="checkbox"] {
  -webkit-appearance: none;
  appearance: none;
  width: 20px;
  height: 20px;
  border: 2px solid var(--border-color);
  border-radius: 4px;
  margin-right: 10px;
  position: relative;
  cursor: pointer;
  vertical-align: middle;
  background-color: var(--card-background);
  transition: background-color var(--transition-speed) ease,
              border-color var(--transition-speed) ease;
}

input[type="checkbox"]:checked {
  background-color: var(--primary-color);
  border-color: var(--primary-color);
}

input[type="checkbox"]:checked::after {
  content: '';
  position: absolute;
  left: 6px;
  top: 2px;
  width: 5px;
  height: 10px;
  border: solid white;
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}

input[type="checkbox"]:focus {
  outline: none;
  box-shadow: 0 0 0 3px rgba(229, 57, 53, 0.2);
}

/* Button Styles */
.button {
  display: inline-block;
  background: var(--primary-color);
  color: white;
  padding: 12px 20px;
  text-decoration: none;
  border: none;
  border-radius: var(--border-radius);
  cursor: pointer;
  font-weight: 500;
  font-size: 16px;
  transition: all var(--transition-speed) ease;
  box-shadow: var(--shadow-sm);
}

.button:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

/* Theme Toggle Button */
.theme-toggle {
  background: rgba(0, 0, 0, 0.1);
  border: none;
  color: var(--text-color);
  font-size: 20px;
  cursor: pointer;
  padding: 5px;
  margin: 0 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  width: 36px;
  height: 36px;
  transition: background-color var(--transition-speed) ease, color var(--transition-speed) ease;
}

.theme-toggle:hover {
  background-color: rgba(0, 0, 0, 0.2);
}

.theme-toggle i {
  line-height: 1;
}

/* Settings section styles */
.settings-option {
  display: flex;
  align-items: center;
  margin: 20px 0;
  padding: 15px;
  background-color: var(--card-background);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-sm);
}

.settings-option span {
  font-weight: 500;
}

#themeLabel {
  margin-left: 10px;
}

.button:active {
  transform: translateY(0);
}

.button-small {
  padding: 8px 15px;
  font-size: 14px;
}

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

.button-success:hover {
  background-color: #218838;
}

.button-warning {
  background-color: var(--warning-color);
  color: #212529;
}

.button-warning:hover {
  background-color: #e0a800;
}

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

.button-danger:hover {
  background-color: #c82333;
}

/* Table Styles */
table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  margin-top: 20px;
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  background-color: var(--card-background);
  transition: background-color var(--transition-speed) ease;
}

table th,
table td {
  padding: 15px;
  text-align: left;
  border-bottom: 1px solid var(--border-color);
  transition: border-color var(--transition-speed) ease;
}

table th {
  background-color: var(--secondary-color);
  color: white;
  font-weight: 500;
  text-transform: uppercase;
  font-size: 14px;
  letter-spacing: 0.5px;
  transition: background-color var(--transition-speed) ease;
}

table tbody tr:last-child td {
  border-bottom: none;
}

table tbody tr:nth-child(even) {
  background-color: rgba(0, 0, 0, 0.02);
}

table tbody tr:hover {
  background-color: rgba(128, 128, 128, 0.08);
}

/* Login Page Styles */
#login-page {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  background: linear-gradient(135deg, var(--secondary-color) 0%, var(--secondary-dark) 100%);
  transition: background var(--transition-speed) ease;
}

#login-page .container {
  background-color: var(--card-background);
  padding: 40px;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-lg);
  text-align: center;
  max-width: 400px;
  width: 90%;
  transition: background-color var(--transition-speed) ease;
}

#login-page h2 {
  color: var(--primary-color);
  margin-bottom: 30px;
  font-weight: 600;
}

#loginForm div {
  margin-bottom: 20px;
}

#loginForm label {
  display: block;
  margin-bottom: 8px;
  font-weight: 500;
  color: var(--secondary-color);
  text-align: left;
}

#loginForm .button {
  margin-top: 15px;
  margin-right: 10px;
  width: calc(50% - 10px);
}

#authError {
  margin-top: 20px;
  color: var(--danger-color);
  font-size: 14px;
  font-weight: 500;
}

/* User Info in Header */
#user-info {
  display: flex;
  align-items: center;
}

#userEmail {
  color: var(--light-color);
  margin-right: 15px;
  font-weight: 500;
}

#logoutButton {
  background-color: rgba(255, 255, 255, 0.1);
  color: white;
  border: none;
  padding: 8px 15px;
  border-radius: var(--border-radius);
  cursor: pointer;
  font-size: 14px;
  transition: background-color var(--transition-speed) ease;
}

#logoutButton:hover {
  background-color: rgba(255, 255, 255, 0.2);
}

/* Theme Controls */
#theme-controls {
  display: flex;
  align-items: center;
  margin-left: 20px;
}

/* Footer Styles */
footer {
  background: var(--secondary-color);
  color: var(--light-color);
  text-align: center;
  padding: 25px 0;
  margin-top: 40px;
  transition: background-color var(--transition-speed) ease;
}

footer p {
  margin: 0;
  font-size: 14px;
  opacity: 0.8;
}

/* To-Do List Specific Styles */
#todo-section {
  background-color: var(--card-background);
  border-radius: var(--border-radius);
  padding: 25px;
  box-shadow: var(--shadow-sm);
  transition: background-color var(--transition-speed) ease;
}

#todoItemsList {
  margin-top: 20px;
}

#todoItemsList li {
  padding: 15px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  transition: background-color var(--transition-speed) ease,
              border-color var(--transition-speed) ease;
}

#todoItemsList li:last-child {
  border-bottom: none;
}

#todoItemsList li:hover {
  background-color: rgba(128, 128, 128, 0.05);
}

#todoItemsList li span {
  flex-grow: 1;
  margin-left: 10px;
  cursor: pointer;
}

#todoItemsList li.completed span {
  text-decoration: line-through;
  color: var(--text-muted);
}

#deleteSelectedTodosButton {
  margin-top: 20px;
  background-color: var(--danger-color);
}

#deleteSelectedTodosButton:hover {
  background-color: #c82333;
}

/* Responsive Design */
@media (max-width: 768px) {
  header .container {
    flex-direction: column;
    text-align: center;
  }
  
  header nav {
    margin-top: 15px;
  }
  
  header nav ul {
    flex-wrap: wrap;
    justify-content: center;
  }
  
  header nav ul li {
    padding: 5px 10px;
  }
  
  #user-info {
    margin-top: 15px;
    justify-content: center;
  }
  
  .button {
    width: 100%;
    margin-bottom: 10px;
  }
  
  #loginForm .button {
    width: 100%;
    margin-right: 0;
  }
}