/* Base Styles */
:root {
    --primary-color: #0088cc;
    --secondary-color: #f0f0f0;
    --accent-color: #25d366;
    --danger-color: #dc3545;
    --warning-color: #ffc107;
    --success-color: #28a745;
    --text-color: #333;
    --text-light: #777;
    --bg-color: #f9f9f9;
    --card-bg: #fff;
    --border-color: #ddd;
    --shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  }
  
  * {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  
  body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    color: var(--text-color);
    background-color: var(--bg-color);
    line-height: 1.6;
  }
  
  a {
    text-decoration: none;
    color: var(--primary-color);
  }
  
  .btn {
    display: inline-block;
    padding: 0.5rem 1rem;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 1rem;
    transition: all 0.3s ease;
  }
  
  .btn:hover {
    background-color: #006699;
    transform: translateY(-1px);
  }
  
  .btn-logout {
    background-color: var(--danger-color);
  }
  
  .btn-logout:hover {
    background-color: #bb2d3b;
  }
  
  .btn-start {
    background-color: var(--success-color);
  }
  
  .btn-start:hover {
    background-color: #218838;
  }
  
  .btn-stop {
    background-color: var(--danger-color);
  }
  
  .btn-stop:hover {
    background-color: #bb2d3b;
  }
  
  .btn-add {
    background-color: var(--accent-color);
  }
  
  .btn-add:hover {
    background-color: #1da851;
  }
  
  .btn-test {
    background-color: var(--warning-color);
    color: var(--text-color);
  }
  
  .btn-test:hover {
    background-color: #e0a800;
  }
  
  .btn-save {
    background-color: var(--success-color);
  }
  
  .btn-save:hover {
    background-color: #218838;
  }
  
  .form-group {
    margin-bottom: 1rem;
  }
  
  .form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
  }
  
  .form-group input,
  .form-group select,
  .form-group textarea {
    width: 100%;
    padding: 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 1rem;
  }
  
  .form-group textarea {
    min-height: 100px;
    resize: vertical;
  }
  
  .form-row {
    display: flex;
    gap: 1rem;
  }
  
  .form-row .form-group {
    flex: 1;
  }
  
  .error-message {
    color: var(--danger-color);
    margin-top: 1rem;
    font-size: 0.9rem;
  }
  
  .hidden {
    display: none !important;
  }
  
  /* Login Page */
  .login-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background-color: var(--secondary-color);
  }
  
  .login-box {
    background-color: var(--card-bg);
    padding: 2rem;
    border-radius: 8px;
    box-shadow: var(--shadow);
    width: 100%;
    max-width: 400px;
  }
  
  .login-box h1 {
    text-align: center;
    margin-bottom: 2rem;
    color: var(--primary-color);
  }
  
  /* Modal */
  .modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
  }
  
  .modal-content {
    background-color: var(--card-bg);
    padding: 2rem;
    border-radius: 8px;
    box-shadow: var(--shadow);
    width: 90%;
    max-width: 600px;
    max-height: 90vh;
    overflow-y: auto;
    position: relative;
  }
  
  .modal-content h2 {
    margin-bottom: 1.5rem;
  }
  
  .close {
    position: absolute;
    top: 1rem;
    right: 1rem;
    font-size: 1.5rem;
    cursor: pointer;
  }
  
  /* Checkbox Group */
  .checkbox-group {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
  }
  
  .checkbox-group label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: normal;
    cursor: pointer;
  }
  
  .checkbox-group input {
    width: auto;
  }

  /* Landing Page Styles */
.landing-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
  }
  
  .landing-header {
    text-align: center;
    padding: 3rem 1rem;
    background-color: var(--primary-color);
    color: white;
  }
  
  .landing-header h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
  }
  
  .landing-main {
    flex: 1;
    padding: 2rem;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
  }
  
  .landing-features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin: 3rem 0;
  }
  
  .feature-card {
    background-color: var(--card-bg);
    padding: 2rem;
    border-radius: 8px;
    box-shadow: var(--shadow);
    transition: transform 0.3s ease;
  }
  
  .feature-card:hover {
    transform: translateY(-5px);
  }
  
  .feature-card h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
  }
  
  .landing-actions {
    text-align: center;
    margin: 3rem 0;
  }
  
  .btn-primary {
    background-color: var(--primary-color);
    color: white;
    padding: 0.75rem 1.5rem;
    font-size: 1.1rem;
  }
  
  .landing-footer {
    text-align: center;
    padding: 1.5rem;
    background-color: var(--secondary-color);
    color: var(--text-light);
  }

/* Media Queries for Responsiveness */
@media (max-width: 768px) {
  .landing-header h1 {
    font-size: 2rem;
  }

  .landing-header {
    padding: 2rem 1rem;
  }

  .feature-card {
    padding: 1.5rem;
  }

  .form-row {
    flex-direction: column;
    gap: 0.5rem;
  }

  .checkbox-group {
    flex-direction: column;
    gap: 0.5rem;
  }

  .btn {
    width: 100%;
    margin-bottom: 0.5rem;
  }

  .modal-content {
    padding: 1.5rem;
  }
}

@media (max-width: 480px) {
  body {
    font-size: 0.9rem;
  }

  .login-box {
    padding: 1.5rem;
  }

  .landing-header h1 {
    font-size: 1.8rem;
  }

  .feature-card h3 {
    font-size: 1.2rem;
  }
}