:root {
  --primary-color: #2c3e50;
  --secondary-color: #3498db;
  --success-color: #27ae60;
  --background-color: #f8f9fa;
  --text-color: #2c3e50;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  margin: 0;
  padding: 0;
  background-color: var(--background-color);
  color: var(--text-color);
}

.container-wrapper {
  display: flex;
  min-height: 100vh;
}

.sidebar {
  width: 280px;
  background: var(--primary-color);
  color: white;
  padding: 20px;
  position: fixed;
  height: 100%;
  box-shadow: 2px 0 5px rgba(0, 0, 0, 0.1);
}

.logo-section {
  text-align: center;
  padding: 20px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  margin-bottom: 30px;
}

.logo-section img {
  height: 50px;
  margin-bottom: 10px;
}

.nav-steps {
  list-style: none;
  padding: 0;
  margin: 0;
}

.nav-steps li {
  margin: 15px 0;
  padding: 12px;
  border-radius: 5px;
  cursor: pointer;
  transition: all 0.3s;
  display: flex;
  align-items: center;
  gap: 10px;
}

.nav-steps li.active {
  background: var(--secondary-color);
}

.nav-steps li.completed {
  background: rgba(255, 255, 255, 0.1);
}

.main-content {
  margin-left: 280px;
  padding: 30px;
  width: calc(100% - 280px);
}

.step-card {
  background: white;
  border-radius: 10px;
  padding: 30px;
  margin-bottom: 30px;
  box-shadow: 0 2px 15px rgba(0, 0, 0, 0.1);
  display: none;
}

.step-card.active {
  display: block;
}

.step-header {
  border-bottom: 2px solid var(--primary-color);
  padding-bottom: 15px;
  margin-bottom: 25px;
  display: flex;
  align-items: center;
}

.step-title {
  font-size: 1.5rem;
  color: var(--primary-color);
  margin: 0;
}

.header-actions {
  margin-left: auto;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  margin-bottom: 8px;
  font-weight: 600;
}

.form-control {
  width: 100%;
  padding: 12px;
  border: 1px solid #ddd;
  border-radius: 5px;
  font-size: 14px;
  transition: border-color 0.3s;
}

.form-control:focus {
  outline: none;
  border-color: var(--secondary-color);
  box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
}

.btn {
  padding: 12px 25px;
  border: none;
  border-radius: 5px;
  cursor: pointer;
  font-weight: 600;
  transition: all 0.3s;
}

.btn-primary {
  background: var(--secondary-color);
  color: white;
}

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

.btn:hover {
  opacity: 0.9;
  transform: translateY(-1px);
}

.data-preview {
  margin-top: 30px;
  overflow-x: auto;
}

.preview-table {
  width: 100%;
  border-collapse: collapse;
  background: white;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.preview-table th,
.preview-table td {
  padding: 12px;
  text-align: left;
  border-bottom: 1px solid #eee;
}

.preview-table th {
  background: var(--primary-color);
  color: white;
  font-weight: 600;
}

.preview-table tr:hover {
  background-color: #f8f9fa;
}

.file-upload {
  border: 2px dashed #ddd;
  border-radius: 8px;
  padding: 20px;
  text-align: center;
  transition: all 0.3s;
}

.file-upload:hover {
  border-color: var(--secondary-color);
  background: rgba(52, 152, 219, 0.05);
}

.error-message {
  color: #e74c3c;
  padding: 10px;
  margin-top: 10px;
  border-radius: 5px;
  background: #f8d7da;
  display: none;
}