:root {
  --primary: #6772e5;
  --primary-dark: #5469d4;
  --secondary: #24b47e;
  --text: #3c4257;
  --text-light: #697386;
  --background: #f6f9fc;
  --border: #e3e8ee;
  --sidebar-width: 240px;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
  font-size: 16px;
  line-height: 1.5;
  color: var(--text);
  background-color: var(--background);
}

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

.sidebar {
  width: var(--sidebar-width);
  background-color: #fff;
  border-right: 1px solid var(--border);
  padding: 20px;
}

.logo h1 {
  font-size: 24px;
  color: var(--primary);
  margin-bottom: 30px;
}

.sidebar nav ul {
  list-style-type: none;
}

.sidebar nav ul li {
  margin-bottom: 10px;
}

.sidebar nav ul li a {
  display: flex;
  align-items: center;
  padding: 10px;
  color: var(--text);
  text-decoration: none;
  border-radius: 5px;
  transition: background-color 0.3s;
}

.sidebar nav ul li a:hover,
.sidebar nav ul li a.active {
  background-color: var(--background);
  color: var(--primary);
}

.sidebar nav ul li a i {
  margin-right: 10px;
}

.main-content {
  flex: 1;
  padding: 20px;
  overflow-y: auto;
}

.top-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 30px;
}

.search-wrapper {
  position: relative;
  width: 300px;
}

.search-input {
  width: 100%;
  padding: 10px 15px 10px 40px;
  border: 1px solid var(--border);
  border-radius: 20px;
  font-size: 14px;
}

.search-icon {
  position: absolute;
  left: 15px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-light);
}

.user-actions {
  display: flex;
  gap: 10px;
}

.btn {
  padding: 10px 20px;
  border: none;
  border-radius: 20px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.3s;
}

.btn-primary {
  background-color: var(--primary);
  color: #fff;
}

.btn-primary:hover {
  background-color: var(--primary-dark);
}

.btn-secondary {
  background-color: var(--secondary);
  color: #fff;
}

.btn-text {
  background-color: transparent;
  color: var(--primary);
}

.btn-text:hover {
  background-color: var(--background);
}

.welcome-card {
  background-color: #fff;
  border-radius: 8px;
  padding: 30px;
  margin-bottom: 30px;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.welcome-card h2 {
  margin-bottom: 10px;
  color: var(--primary);
}

.quick-stats {
  display: flex;
  gap: 20px;
  margin-bottom: 30px;
}

.stat-card {
  background-color: #fff;
  border-radius: 8px;
  padding: 20px;
  flex: 1;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
  text-align: center;
}

.stat-card h3 {
  margin-bottom: 10px;
  color: var(--text-light);
}

.stat-card p {
  font-size: 24px;
  font-weight: bold;
  color: var(--primary);
}

.dashboard-content {
  background-color: #fff;
  border-radius: 8px;
  padding: 30px;
  margin-bottom: 30px;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.table-controls {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}

.books-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0 10px;
}

.books-table th,
.books-table td {
  padding: 15px;
  text-align: left;
}

.books-table th {
  background-color: var(--background);
  color: var(--text-light);
  font-weight: 600;
}

.books-table tr {
  background-color: #fff;
  box-shadow: 0 1px 3px rgba(0,0,0,0.1);
  transition: box-shadow 0.3s;
}

.books-table tr:hover {
  box-shadow: 0 3px 6px rgba(0,0,0,0.15);
}

#progress-list,
#recommendations-list,
#quotes-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 20px;
  margin-bottom: 20px;
}

.progress-card,
.recommendation-card,
.quote-card {
  background-color: #fff;
  border-radius: 8px;
  padding: 20px;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.progress-card h3,
.recommendation-card h3 {
  margin-bottom: 10px;
  color: var(--primary);
}

.quote-card p:first-child {
  font-style: italic;
  margin-bottom: 10px;
}

.quote-card p:last-child {
  text-align: right;
  color: var(--text-light);
}

.challenge-progress {
  background-color: #fff;
  border-radius: 8px;
  padding: 20px;
  margin-bottom: 20px;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

#challenge-progress-bar {
  width: 100%;
  height: 20px;
  margin: 10px 0;
}

.modal {
  display: none;
  position: fixed;
  z-index: 1000;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0,0,0,0.5);
}

.modal-content {
  background-color: #fff;
  margin: 10% auto;
  padding: 30px;
  border-radius: 8px;
  width: 80%;
  max-width: 600px;
  box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.close {
  color: var(--text-light);
  float: right;
  font-size: 28px;
  font-weight: bold;
  cursor: pointer;
}

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

.form-group label {
  display: block;
  margin-bottom: 5px;
  color: var(--text-light);
  font-weight: bold;
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 10px;
  border: 1px solid var(--border);
  border-radius: 4px;
  font-size: 14px;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 2px rgba(103, 114, 229, 0.2);
}

.form-actions {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
}

.message-section {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 1001;
}

.message {
  padding: 15px 20px;
  border-radius: 4px;
  margin-bottom: 10px;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.message-success {
  background-color: #d4edda;
  color: #155724;
}

.message-error {
  background-color: #f8d7da;
  color: #721c24;
}

.btn-block {
  display: block;
  width: 100%;
}

@media (max-width: 768px) {
  .app-container {
    flex-direction: column;
  }

  .sidebar {
    width: 100%;
    border-right: none;
    border-bottom: 1px solid var(--border);
  }

  .main-content {
    padding: 10px;
  }

  .top-bar {
    flex-direction: column;
    align-items: stretch;
  }

  .search-wrapper {
    width: 100%;
    margin-bottom: 10px;
  }

  .user-actions {
    justify-content: space-between;
  }

  .quick-stats {
    flex-direction: column;
  }

  .books-table {
    font-size: 14px;
  }

  .modal-content {
    width: 95%;
    margin: 5% auto;
  }
}