/* =====================
   CSS Variables
===================== */
:root {
  /* Brand Colors */
  --gunmetal: #153E4A;
  --teal: #48b7c7;
  --columbia-blue: #cfe4fc;
  --lavender-web: #f0f5fa;
  --white: #ffffffff;

  --color-bg-gradient: linear-gradient(135deg, var(--lavender-web) 0%, var(--columbia-blue) 100%);
  --color-header-gradient: linear-gradient(135deg, var(--gunmetal) 0%, #1c4d5a 100%);
  --color-accent: var(--teal);
  --color-accent-2: #3aa3b3;
  --color-danger: #D32F2F;
  --color-light: var(--lavender-web);
  --color-muted: #6B7280;
  --color-dark: var(--gunmetal);
  --color-border: #E5E7EB;
  --color-neutral-gradient: linear-gradient(135deg, #CFD8DC 0%, #B0BEC5 100%);
  --color-link: var(--teal);
  --color-link-hover: #3aa3b3;
  --color-success: var(--color-accent)
  
  /* Bootstrap Theme Colors - Overriding Defaults */
  --bs-primary: var(--color-accent) !important;
  --bs-secondary: var(--color-muted) !important;
  --bs-success: var(--color-success) !important;
  --bs-info: var(--color-accent !important;);
  --bs-warning: #FFA000 !important;
  --bs-danger: var(--color-danger) !important;
  --bs-light: var(--color-light) !important;
  --bs-dark: var(--color-dark) !important;

  /* Gray Colors for components and borders */
  --bs-gray-100: #F8F9FA;
  --bs-gray-200: #E9ECEF;
  --bs-gray-300: var(--color-border);
  --bs-gray-400: #CED4DA;
  --bs-gray-500: #ADB5BD;
  --bs-gray-600: var(--color-muted);
  --bs-gray-700: #495057;
  --bs-gray-800: var(--color-dark);
  --bs-gray-900: #212529;

  /* Typography */
  --font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.25rem;
  --font-weight-regular: 400;
  --font-weight-bold: 600;
  
  /* Layout & Borders */
  --radius-lg: 16px;
  --radius-md: 10px;
  --radius-sm: 6px;
  --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 5px 15px rgba(0, 0, 0, 0.05);
  --shadow-glow: 0 0 15px rgba(72, 183, 199, 0.3);
  
  /* Animation */
  --transition: all 0.3s ease;
}
  
  
  
.highlight {
  background-color: var(--color-accent);
  color: var(--white);
}


.filter-btn {
  color: var(--white);
  border-color: var(--white);
}

.filter-btn:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
}
  
.filter-btn.active {
  background: var(--color-accent);
  color: var(--white);
  border-color: var(--color-accent);
}
  
/* =====================
   Global Styles
===================== */
body {
  background: var(--color-bg-gradient);
  min-height: 100vh;
  font-family: var(--font-family);
  display: flex;
  flex-direction: column;
}
  
/* =====================
   Containers & Layout
===================== */
.main-container {
  background: var(--white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  margin: 2rem 0;
}
  
.header {
  background: var(--color-header-gradient);
  color: white;
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  padding: 2rem;
  text-align: center;
}
  
.content {
  padding: 2rem;
}
  
/* =====================
   Forms & Controls
===================== */
.form-container {
  padding: 2rem;
}
  
.form-control, .form-select {
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  padding: 0.75rem 1rem;
  transition: var(--transition);
}
.form-control:focus, .form-select:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 0.2rem rgba(72, 183, 199, 0.25);
}

.form-select {
  background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3e%3cpath fill='none' stroke='%236B7280' stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M2 5l6 6 6-6'/%3e%3c/svg%3e");
}

.form-check-input {
  border-color: var(--color-border);
}

.form-check-input:checked {
  background-color: var(--color-accent);
  border-color: var(--color-accent);
  background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20'%3e%3cpath fill='none' stroke='%23ffffff' stroke-linecap='round' stroke-linejoin='round' stroke-width='3' d='M6 10l3 3l6-6'/%3e%3c/svg%3e");
}

.form-check-input:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 0.2rem rgba(72, 183, 199, 0.25);
}

/* Buttons */
.btn-search,
.modal-footer .btn-primary {
  background: var(--color-accent);
  border: none;
  border-radius: var(--radius-md);
  padding: 0.75rem 2rem;
  color: white;
  font-weight: 600;
  transition: var(--transition);
  transform: translateY(0);
}
.btn-search:hover,
.modal-footer .btn-primary:hover {
  background: var(--color-accent-2);
  transform: translateY(-2px);
  box-shadow: 0 5px 15px rgba(72, 183, 199, 0.4);
  color: white;
}
  
/* Back Button */
.btn-back {
  background: var(--color-neutral-gradient);
  border: none;
  border-radius: var(--radius-md);
  padding: 0.75rem 1.5rem;
  color: var(--gunmetal);
  font-weight: 600;
  text-decoration: none;
  display: inline-block;
  transition: var(--transition);
}
.btn-back:hover {
  transform: translateY(-2px);
  box-shadow: 0 5px 15px rgba(107, 114, 128, 0.4);
  color: var(--gunmetal);
  text-decoration: none;
}
  
/* =====================
   Slider
===================== */
.slider-container {
  position: relative;
  margin: 1rem 0;
}
.slider {
  width: 100%;
  height: 6px;
  border-radius: 3px;
  background: var(--color-border);
  outline: none;
  -webkit-appearance: none;
}
.slider::-webkit-slider-thumb {
  appearance: none;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--color-accent);
  cursor: pointer;
  border: 2px solid white;
  box-shadow: 0 2px 5px rgba(0,0,0,0.2);
}
.slider-value {
  display: inline-block;
  background: var(--color-neutral-gradient);
  color: var(--gunmetal);
  padding: 0.25rem 0.5rem;
  border-radius: var(--radius-sm);
  font-size: var(--font-size-sm);
  font-weight: 600;
  margin-left: 0.5rem;
}
  
/* =====================
   Loading Spinner
===================== */
.modal-body .spinner-border {
  width: 3rem;  /* Example: make the spinner a bit larger */
  height: 3rem; /* Example: make the spinner a bit larger */
  color: var(--color-accent); /* Example: ensure the color is a specific primary blue */
}
  
/* =====================
   Info Button + Modal
===================== */
.btn-info-button {
  position: absolute;
  top: 20px;
  right: 20px;
  background: rgba(255, 255, 255, 0.1);
  color: var(--color-accent);
  border: none;
  border-radius: 50%;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  transition: var(--transition);
}
.btn-info-button:hover {
  background: rgba(255, 255, 255, 0.2);
  transform: scale(1.1);
  cursor: pointer;
}
  
.modal-content {
  border-radius: var(--radius-lg);
  background: var(--white);
  box-shadow: var(--shadow-lg);
}
.modal-header {
  background: var(--color-header-gradient);
  color: white;
  border-top-left-radius: var(--radius-lg);
  border-top-right-radius: var(--radius-lg);
  border-bottom: none;
}
  
/* =====================
   Table & Results
===================== */
.search-info {
  background: var(--color-light);
  border-radius: var(--radius-md);
  padding: 1rem;
  margin-bottom: 2rem;
  border-left: 4px solid var(--color-accent);
}
.table-container {
  background: var(--white);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  overflow: hidden;
  margin-bottom: 2rem;
}
.table {
  margin-bottom: 0;
}
.table th {
  background: var(--color-header-gradient);
  color: white;
  border: none;
  font-weight: 600;
  padding: 1rem;
}
.table td {
  padding: 1rem;
  vertical-align: middle;
  border-color: var(--color-border);
}
.table tbody tr:hover {
  background-color: var(--color-light);
}
  
.paper-title {
  font-weight: 600;
  color: var(--color-dark);
  margin-bottom: 0.25rem;
}
.paper-authors {
  color: var(--color-muted);
  font-size: 0.9rem;
}
.score-badge {
  background: var(--color-accent);
  color: white;
  padding: 0.25rem 0.75rem;
  border-radius: 50px;
  font-weight: 600;
  font-size: var(--font-size-sm);
}
.link-btn {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  background: var(--color-light);
  color: var(--color-link);
  text-decoration: none;
  border-radius: var(--radius-sm);
  font-size: var(--font-size-sm);
  margin: 0.125rem;
  transition: all 0.2s;
  border: 1px solid var(--color-border);
}
.link-btn:hover {
  background: var(--color-link-hover);
  color: white;
  text-decoration: none;
  border-color: var(--color-link-hover);
}
.summary-section {
  background: var(--color-light);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  margin-bottom: 2rem;
  border: 1px solid var(--color-border);
}
.summary-text {
  line-height: 1.6;
  color: var(--color-dark);
}
.no-results {
  text-align: center;
  padding: 3rem;
  color: var(--color-muted);
}
.no-results i {
  font-size: 4rem;
  margin-bottom: 1rem;
  color: #CFD8DC;
}
.abstract-preview {
  max-width: 300px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  color: var(--color-muted);
  font-size: var(--font-size-sm);
  font-style: italic;
}
  
/* =====================
   Error Page
===================== */
.error-container {
  background: var(--white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: 3rem;
  text-align: center;
  max-width: 500px;
  margin: auto;
}
.error-icon {
  font-size: 4rem;
  color: var(--color-danger);
  margin-bottom: 1.5rem;
}
.error-title {
  color: var(--color-dark);
  margin-bottom: 1rem;
}
.error-message {
  color: var(--color-muted);
  margin-bottom: 2rem;
}


/* Add these styles to your existing styles.css file */

/* Keywords section styling */
.keywords-section {
  background: var(--color-bg-gradient);
  padding: 2rem;
  border-radius: 15px;
  border: 1px solid #dee2e6;
  margin-bottom: 2rem;
}

.keywords-section h3 {
  color: #495057;
  margin-bottom: 1.5rem;
  font-weight: 600;
}

.keywords-section .card {
  border: none;
  box-shadow: 0 4px 6px var(--shadow-lg);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.keywords-section .card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 15px rgba(0, 0, 0, 0.15);
}

.keywords-section .card-header {
  background: var(--color-header-gradient);
  color: white;
  border-bottom: none;
  font-weight: 500;
}

.keywords-section .card-body {
  padding: 1.5rem;
}

/* Keyword list styling */
.keyword-name {
  color: #495057;
  font-weight: 500;
  line-height: 1.4;
}

.list-group-item {
  border-left: 3px solid transparent;
  transition: border-color 0.3s ease, background-color 0.3s ease;
}

.list-group-item:hover {
  background-color: var(--bs-gray-100);
  border-left-color: var(--color-accent);
}

/* Chart containers */
.chart-container {
  position: relative;
  height: 800px;
  margin: 1rem 0;
}

/*#keywordsChart {
  height: 300px !important;
}

#timeSeriesChart {
  height: 300px !important;
}*/

/* Responsive adjustments 
@media (max-width: 768px) {
  .keywords-section {
      padding: 1rem;
  }
  
  .keywords-section .row {
      margin: 0;
  }
  
  .keywords-section .col-md-8,
  .keywords-section .col-md-4 {
      padding: 0.5rem;
  }
  
  #keywordsChart {
      height: 300px !important;
  }
  
  #timeSeriesChart {
      height: 350px !important;
  }
}
*/

/* Enhanced accordion styling */
.accordion-item {
  border: 1px solid #dee2e6;
  transition: all 0.3s ease;
}

.accordion-item:hover {
  border-color: var(--color-accent);
  box-shadow: 0 2px 8px rgba(0, 123, 255, 0.15);
}

.accordion-button:not(.collapsed) {
  background: var(--color-bg-gradient);
  color: var(--color-dark)
}


/* Loading spinner for keyword data */
.keywords-loading {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 200px;
  color: #6c757d;
}

.keywords-loading .spinner-border {
  margin-right: 1rem;
}

/* Badge styling improvements */
.badge.bg-primary {
  background: linear-gradient(135deg, #007bff 0%, #0056b3 100%) !important;
}

.badge.bg-success {
  background: linear-gradient(135deg, #28a745 0%, #1e7e34 100%) !important;
}

/* Chart legend customization */
.chart-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1rem;
  justify-content: center;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.25rem 0.5rem;
  border-radius: 0.25rem;
  background: #f8f9fa;
  font-size: 0.875rem;
  cursor: pointer;
  transition: background-color 0.2s ease;
}

.legend-item:hover {
  background: #e9ecef;
}

.legend-color {
  width: 12px;
  height: 12px;
  border-radius: 2px;
}

/* Keyword detail modal (if implemented) */
.keyword-modal .modal-content {
  border-radius: 15px;
  border: none;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.keyword-modal .modal-header {
  background: linear-gradient(135deg, #007bff 0%, #0056b3 100%);
  color: white;
  border-radius: 15px 15px 0 0;
  border-bottom: none;
}

.keyword-modal .btn-close {
  filter: invert(1);
}

/* Animation for chart loading */
@keyframes fadeInUp {
  from {
      opacity: 0;
      transform: translateY(20px);
  }
  to {
      opacity: 1;
      transform: translateY(0);
  }
}

.keywords-section .card {
  animation: fadeInUp 0.6s ease-out;
}

.keywords-section .card:nth-child(2) {
  animation-delay: 0.1s;
}

.keywords-section .row:nth-child(2) .card {
  animation-delay: 0.2s;
}