:root {
  --color-primary: #8b5cf6;
  --color-primary-dark: #7c3aed;
  --color-secondary: #3b82f6;
  --color-accent: #f59e0b;
  --color-background: #ffffff;
  --color-surface: #f9fafb;
  --color-text: #1f2937;
  --color-text-light: #6b7280;
  --color-border: #e5e7eb;
  --color-success: #10b981;
  --color-error: #ef4444;
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 20px rgba(0, 0, 0, 0.15);
  --radius: 0.625rem;
  --radius-sm: 0.5rem;
  --radius-lg: 0.875rem;
}

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

body {
  font-family: "Poppins", sans-serif;
  background-color: var(--color-background);
  color: var(--color-text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.main-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-lg) var(--spacing-md);
  min-height: calc(100vh - 200px);
}

.page-header {
  margin-bottom: var(--spacing-lg);
  padding-bottom: var(--spacing-md);
  border-bottom: 2px solid var(--color-border);
}

.page-title {
  font-size: 2.5rem;
  background: linear-gradient(
    135deg,
    var(--color-primary) 0%,
    var(--color-secondary) 100%
  );
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--spacing-xs);
  font-weight: 700;
}

.page-description {
  font-size: 1.125rem;
  color: var(--color-text-light);
}

.spinner {
  border: 3px solid var(--color-border);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  width: 40px;
  height: 40px;
  animation: spin 0.8s linear infinite;
  margin: var(--spacing-lg) auto;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.progress-container {
  margin-bottom: var(--spacing-lg);
}

.progress-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-sm);
}

.progress-header h2 {
  font-size: 1.5rem;
  font-weight: 600;
}

.progress-header span {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-primary);
}

.progress-bar {
  width: 100%;
  height: 32px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  position: relative;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(
    90deg,
    var(--color-primary) 0%,
    var(--color-secondary) 50%,
    var(--color-accent) 100%
  );
  transition: width 0.3s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 600;
  font-size: 0.875rem;
  box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.1);
}

.alert {
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius);
  margin-top: var(--spacing-sm);
  border-left: 4px solid;
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.alert-success {
  background-color: rgba(16, 185, 129, 0.1);
  border-color: var(--color-success);
  color: var(--color-success);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

.stat-card {
  background: linear-gradient(
    135deg,
    var(--color-surface) 0%,
    var(--color-background) 100%
  );
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-md);
  text-align: center;
  box-shadow: var(--shadow-sm);
  transition: all 0.3s ease;
}

.stat-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.stat-value {
  font-size: 2.5rem;
  font-weight: 700;
  background: linear-gradient(
    135deg,
    var(--color-primary) 0%,
    var(--color-secondary) 50%,
    var(--color-accent) 100%
  );
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--spacing-xs);
}

.stat-label {
  font-size: 0.875rem;
  color: var(--color-text-light);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  font-weight: 500;
}

.card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-md);
  box-shadow: var(--shadow-sm);
  margin-bottom: var(--spacing-md);
}

.card-header {
  margin-bottom: var(--spacing-sm);
}

.card-title {
  font-size: 1.25rem;
  color: var(--color-text);
  font-weight: 600;
}

.card-body {
  color: var(--color-text-light);
}

.grid {
  display: grid;
  gap: var(--spacing-md);
}

.grid-2 {
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-3 {
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

.genre-item {
  margin-bottom: var(--spacing-sm);
}

.genre-header {
  display: flex;
  justify-content: space-between;
  margin-bottom: 0.25rem;
}

.genre-header span:first-child {
  font-weight: 500;
  color: var(--color-text);
}

.genre-bar {
  height: 8px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
}

.genre-bar-fill {
  height: 100%;
  background: linear-gradient(
    90deg,
    var(--color-primary) 0%,
    var(--color-secondary) 100%
  );
  transition: width 0.3s ease;
}

.book-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.book-item {
  padding: var(--spacing-sm);
  background-color: var(--color-background);
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--color-primary);
}

.book-title {
  font-weight: 600;
  color: var(--color-text);
}

.book-author {
  font-size: 0.875rem;
  color: var(--color-text-light);
}

.book-meta {
  font-size: 0.75rem;
  color: var(--color-text-light);
  margin-top: 0.25rem;
}

.insight-item h3 {
  font-size: 1rem;
  margin-bottom: var(--spacing-xs);
  font-weight: 500;
  color: var(--color-text);
}

.insight-value {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--color-primary);
}

#trendChart canvas {
  width: 100% !important;
  height: auto !important;
}

@media (max-width: 768px) {
  .main-container {
    padding: var(--spacing-md) var(--spacing-sm);
  }
  .page-title {
    font-size: 2rem;
  }
  .stats-grid {
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  }
  .stat-value {
    font-size: 2rem;
  }
  .grid-2,
  .grid-3 {
    grid-template-columns: 1fr;
  }
  .progress-header {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-xs);
  }
}