/* Improved KIS-LAB Theme - Enhanced UX */

:root {
  /* Enhanced Color Palette */
  --primary: #FF6B6B;
  --primary-dark: #E85555;
  --primary-light: #FFB5B5;
  --secondary: #4ECDC4;
  --secondary-dark: #3BA49C;
  --accent: #A78BFA;
  --accent-dark: #8B5CF6;
  --success: #51CF66;
  --warning: #FFB84D;
  --error: #EF4444;

  /* Improved gradients */
  --gradient-kislab: linear-gradient(120deg, #FF6B6B 0%, #4ECDC4 50%, #A78BFA 100%);
  --gradient-soft: linear-gradient(135deg, rgba(255,107,107,0.1) 0%, rgba(78,205,196,0.1) 100%);

  /* Refined neutrals */
  --gray-50: #FAFAFA;
  --gray-100: #F5F5F5;
  --gray-200: #E5E5E5;
  --gray-300: #D4D4D4;
  --gray-400: #A3A3A3;
  --gray-500: #737373;
  --gray-600: #525252;
  --gray-700: #404040;
  --gray-800: #262626;
  --gray-900: #171717;

  /* Better shadows */
  --shadow-xs: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-sm: 0 2px 4px 0 rgb(0 0 0 / 0.06);
  --shadow-md: 0 4px 8px -2px rgb(0 0 0 / 0.08);
  --shadow-lg: 0 10px 20px -5px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 30px -10px rgb(0 0 0 / 0.15);
  --shadow-glow: 0 0 20px rgba(255, 107, 107, 0.2);

  /* Spacing scale */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;

  /* Border radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);

  /* Z-index scale */
  --z-base: 0;
  --z-dropdown: 10;
  --z-sticky: 20;
  --z-modal: 30;
  --z-popover: 40;
  --z-tooltip: 50;
}

/* Reset & Base Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', 'Noto Sans JP', -apple-system, BlinkMacSystemFont, sans-serif;
  line-height: 1.6;
  color: var(--gray-800);
  background: linear-gradient(180deg, #FFFFFF 0%, #FAFAFA 100%);
  background-attachment: fixed;
  min-height: 100vh;
}

/* Accessibility */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

.skip-to-main {
  position: absolute;
  left: -9999px;
  z-index: 999;
  padding: 1em;
  background: var(--primary);
  color: white;
  text-decoration: none;
}

.skip-to-main:focus {
  left: 50%;
  transform: translateX(-50%);
  top: 0;
}

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

/* Header */
.header {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--gray-200);
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  transition: all var(--transition-normal);
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-md) 0;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.logo-icon {
  font-size: 2rem;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}

.logo-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--gray-900);
  letter-spacing: -0.02em;
}

.tagline {
  font-size: 0.75rem;
  color: var(--gray-600);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.header-nav {
  display: flex;
  gap: var(--spacing-sm);
}

.nav-button {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm) var(--spacing-md);
  background: white;
  border: 1px solid var(--gray-300);
  border-radius: var(--radius-md);
  color: var(--gray-700);
  text-decoration: none;
  font-weight: 500;
  transition: all var(--transition-fast);
  cursor: pointer;
}

.nav-button:hover {
  background: var(--gray-50);
  border-color: var(--gray-400);
  transform: translateY(-2px);
}

.nav-button.primary {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
}

.nav-button.primary:hover {
  background: var(--primary-dark);
  border-color: var(--primary-dark);
}

/* Hero Section */
.hero {
  padding: var(--spacing-3xl) 0 var(--spacing-2xl);
  background: var(--gradient-soft);
}

.hero-content {
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
}

.hero-title {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-lg);
  letter-spacing: -0.03em;
}

.gradient-text {
  background: var(--gradient-kislab);
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

.hero-subtitle {
  font-size: 1.125rem;
  color: var(--gray-600);
  margin-bottom: var(--spacing-2xl);
  line-height: 1.7;
}

/* Search Form */
.search-wrapper {
  max-width: 680px;
  margin: 0 auto;
}

.search-form {
  margin-bottom: var(--spacing-xl);
}

.search-box {
  background: white;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
  border: 2px solid transparent;
  transition: all var(--transition-normal);
}

.search-box:focus-within {
  border-color: var(--primary);
  box-shadow: var(--shadow-xl), 0 0 0 4px rgba(255, 107, 107, 0.1);
}

.search-input-wrapper {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-sm);
  position: relative;
}

.search-icon {
  font-size: 1.25rem;
  color: var(--gray-400);
  padding-top: var(--spacing-xs);
}

#searchInput {
  flex: 1;
  border: none;
  outline: none;
  font-size: 1rem;
  font-family: inherit;
  resize: vertical;
  min-height: 80px;
  max-height: 200px;
  line-height: 1.6;
  color: var(--gray-900);
  background: transparent;
}

#searchInput::placeholder {
  color: var(--gray-400);
}

.clear-button {
  position: absolute;
  right: 0;
  top: 0;
  background: var(--gray-200);
  border: none;
  border-radius: var(--radius-full);
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.clear-button:hover {
  background: var(--gray-300);
  transform: scale(1.1);
}

.search-meta {
  display: flex;
  justify-content: space-between;
  padding-top: var(--spacing-sm);
  margin-top: var(--spacing-sm);
  border-top: 1px solid var(--gray-200);
  font-size: 0.875rem;
  color: var(--gray-500);
}

.char-count {
  transition: color var(--transition-fast);
}

.char-count.warning {
  color: var(--warning);
}

.char-count.error {
  color: var(--error);
}

/* Search Suggestions */
.search-suggestions {
  background: white;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  margin-top: var(--spacing-sm);
  overflow: hidden;
  animation: slideDown var(--transition-normal);
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.suggestions-header {
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--gray-50);
  border-bottom: 1px solid var(--gray-200);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--gray-600);
}

.suggestions-list {
  list-style: none;
  padding: 0;
}

.suggestions-list li {
  padding: var(--spacing-sm) var(--spacing-md);
  cursor: pointer;
  transition: background var(--transition-fast);
}

.suggestions-list li:hover,
.suggestions-list li:focus {
  background: var(--gray-50);
}

/* Search Button */
.search-button {
  background: var(--gradient-kislab);
  color: white;
  border: none;
  border-radius: var(--radius-md);
  padding: var(--spacing-md) var(--spacing-xl);
  font-size: 1.0625rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-md);
  margin: 0 auto;
  position: relative;
  overflow: hidden;
}

.search-button::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 100%;
  height: 100%;
  background: rgba(255, 255, 255, 0.2);
  transform: translate(-50%, -50%) scale(0);
  border-radius: 50%;
  transition: transform 0.5s;
}

.search-button:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.search-button:hover::before {
  transform: translate(-50%, -50%) scale(2);
}

.search-button:active {
  transform: translateY(0);
}

.search-button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

/* Quick Filters */
.quick-filters {
  text-align: center;
}

.filters-title {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--gray-600);
  margin-bottom: var(--spacing-sm);
}

.filter-chips {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  justify-content: center;
}

.filter-chip {
  background: white;
  border: 1.5px solid var(--gray-300);
  border-radius: var(--radius-full);
  padding: var(--spacing-xs) var(--spacing-md);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--gray-700);
  cursor: pointer;
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.filter-chip:hover {
  background: var(--primary);
  border-color: var(--primary);
  color: white;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.filter-chip.active {
  background: var(--primary);
  border-color: var(--primary);
  color: white;
}

/* Loading State */
.loading-state {
  padding: var(--spacing-3xl) 0;
  text-align: center;
}

.loading-content {
  max-width: 400px;
  margin: 0 auto;
}

.spinner {
  width: 48px;
  height: 48px;
  border: 3px solid var(--gray-200);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: 0 auto var(--spacing-lg);
}

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

.loading-progress {
  margin-top: var(--spacing-lg);
  background: var(--gray-200);
  border-radius: var(--radius-full);
  height: 4px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: var(--gradient-kislab);
  animation: progress 2s ease-in-out infinite;
}

@keyframes progress {
  0% { width: 0; }
  50% { width: 70%; }
  100% { width: 100%; }
}

/* AI Explanation */
.explanation-section {
  padding: var(--spacing-xl) 0;
  animation: fadeIn var(--transition-slow);
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.explanation-card {
  background: linear-gradient(135deg, rgba(255,107,107,0.05) 0%, rgba(78,205,196,0.05) 100%);
  border: 2px solid var(--primary-light);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  position: relative;
}

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

.ai-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  background: var(--primary);
  color: white;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  font-weight: 600;
}

.collapse-button {
  background: none;
  border: none;
  font-size: 1.25rem;
  cursor: pointer;
  color: var(--gray-600);
  width: 32px;
  height: 32px;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.collapse-button:hover {
  background: var(--gray-100);
}

.explanation-text {
  font-size: 1rem;
  line-height: 1.7;
  color: var(--gray-700);
  word-wrap: break-word;
  white-space: pre-wrap; /* Preserve line breaks */
  max-height: none; /* Show full content */
}

.explanation-actions {
  display: flex;
  gap: var(--spacing-md);
  margin-top: var(--spacing-lg);
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--gray-200);
}

.action-link {
  background: none;
  border: none;
  color: var(--primary);
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-md);
}

.action-link:hover {
  background: rgba(255, 107, 107, 0.1);
}

/* Results Section */
.results-section {
  padding: var(--spacing-xl) 0 var(--spacing-3xl);
}

.results-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-lg);
  flex-wrap: wrap;
  gap: var(--spacing-md);
}

.results-meta {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
}

.results-count {
  font-size: 1rem;
  color: var(--gray-600);
}

.results-actions {
  display: flex;
  gap: var(--spacing-sm);
}

.sort-button,
.view-toggle {
  background: white;
  border: 1px solid var(--gray-300);
  border-radius: var(--radius-md);
  padding: var(--spacing-xs) var(--spacing-md);
  font-size: 0.875rem;
  cursor: pointer;
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.sort-button:hover,
.view-toggle:hover {
  background: var(--gray-50);
  border-color: var(--gray-400);
}

/* Results Grid - Original Style */
.results-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
}

/* Result Cards - Original KIS-LAB Style */
.result-card {
  background: white;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  transition: all var(--transition-normal);
  position: relative;
}

.result-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
  border-color: var(--primary-light);
}

.result-badges {
  display: flex;
  gap: var(--spacing-xs);
  margin-bottom: var(--spacing-sm);
  flex-wrap: wrap;
}

.badge {
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.badge-high {
  background: linear-gradient(135deg, #FF6B6B, #FF8E8E);
  color: white;
}

.badge-medium {
  background: linear-gradient(135deg, #4ECDC4, #6FD8D0);
  color: white;
}

.badge-iec {
  background: linear-gradient(135deg, #A78BFA, #B9A3FC);
  color: white;
}

.badge-vr {
  background: linear-gradient(135deg, #3B82F6, #60A5FA);
  color: white;
}

.result-title {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--gray-900);
  margin-bottom: var(--spacing-sm);
  line-height: 1.4;
}

.result-meta {
  display: flex;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-md);
  font-size: 0.875rem;
  color: var(--gray-600);
}

.result-author {
  font-weight: 500;
}

.result-author::before {
  content: '👤 ';
  opacity: 0.7;
}

.result-year {
  font-weight: 500;
}

.result-year::before {
  content: '📅 ';
  opacity: 0.7;
}

.result-abstract {
  font-size: 0.9375rem;
  line-height: 1.6;
  color: var(--gray-700);
  margin-bottom: var(--spacing-md);
  /* Show full abstract without truncation */
  word-wrap: break-word;
}

.result-keywords {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  margin-bottom: var(--spacing-md);
  flex-wrap: wrap;
}

.keywords-label,
.methods-label {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--gray-600);
  margin-right: var(--spacing-xs);
}

.keyword,
.method-tag {
  background: var(--gray-100);
  color: var(--gray-700);
  padding: 2px 10px;
  border-radius: var(--radius-full);
  font-size: 0.8125rem;
  font-weight: 500;
  border: 1px solid var(--gray-200);
}

.result-methods {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  margin-bottom: var(--spacing-md);
  flex-wrap: wrap;
}

.method-tag {
  background: linear-gradient(135deg, #E0E7FF, #F0F4FF);
  border-color: #C7D2FE;
}

.result-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--gray-200);
}

.result-score {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  flex: 1;
}

.score-label {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--gray-600);
}

.score-bar {
  flex: 1;
  max-width: 120px;
  height: 6px;
  background: var(--gray-200);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.score-fill {
  height: 100%;
  background: var(--gradient-kislab);
  transition: width 1s ease-out;
}

.score-value {
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--primary);
  min-width: 40px;
  text-align: right;
}

.result-link {
  background: white;
  border: 1px solid var(--primary);
  color: var(--primary);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-md);
  font-weight: 500;
  font-size: 0.875rem;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.result-link:hover {
  background: var(--primary);
  color: white;
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

/* Research Cards */
.research-card {
  background: white;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  cursor: pointer;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.research-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--gradient-kislab);
  transform: translateX(-100%);
  transition: transform var(--transition-normal);
}

.research-card:hover,
.research-card:focus {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
  border-color: var(--primary-light);
}

.research-card:hover::before {
  transform: translateX(0);
}

.card-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
}

.card-icon {
  font-size: 1.5rem;
}

.card-header h3 {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--gray-900);
}

.card-description {
  font-size: 0.9375rem;
  line-height: 1.6;
  color: var(--gray-600);
  margin-bottom: var(--spacing-md);
}

.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
}

.tag {
  background: var(--gray-100);
  color: var(--gray-700);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 500;
}

/* Lab Statistics */
.lab-stats {
  background: white;
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  margin-top: var(--spacing-3xl);
  box-shadow: var(--shadow-md);
}

.stats-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: var(--spacing-lg);
  color: var(--gray-900);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: var(--spacing-lg);
}

.stat-card {
  text-align: center;
}

.stat-value {
  font-size: 2rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: var(--spacing-xs);
}

.stat-label {
  font-size: 0.875rem;
  color: var(--gray-600);
}

/* Empty State */
.empty-state {
  padding: var(--spacing-3xl) 0;
  text-align: center;
}

.empty-content {
  max-width: 500px;
  margin: 0 auto;
}

.empty-icon {
  font-size: 4rem;
  margin-bottom: var(--spacing-lg);
  opacity: 0.5;
}

.empty-state h3 {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
  color: var(--gray-900);
}

.empty-state p {
  color: var(--gray-600);
  margin-bottom: var(--spacing-xl);
}

.empty-suggestions {
  background: var(--gray-50);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  text-align: left;
  margin-bottom: var(--spacing-xl);
}

.empty-suggestions h4 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: var(--spacing-md);
  color: var(--gray-800);
}

.empty-suggestions ul {
  list-style-position: inside;
  color: var(--gray-600);
  line-height: 1.8;
}

.empty-actions {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
}

/* Buttons */
.primary-button,
.secondary-button {
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: var(--radius-md);
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  border: none;
  font-size: 1rem;
}

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

.primary-button:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.secondary-button {
  background: white;
  color: var(--gray-700);
  border: 1px solid var(--gray-300);
}

.secondary-button:hover {
  background: var(--gray-50);
  border-color: var(--gray-400);
}

/* Modal */
.modal {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: var(--z-modal);
  padding: var(--spacing-lg);
}

.modal-content {
  background: white;
  border-radius: var(--radius-xl);
  max-width: 500px;
  width: 100%;
  max-height: 80vh;
  overflow-y: auto;
  animation: modalSlide var(--transition-normal);
}

@keyframes modalSlide {
  from {
    opacity: 0;
    transform: scale(0.9);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-lg);
  border-bottom: 1px solid var(--gray-200);
}

.modal-header h2 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--gray-900);
}

.modal-close {
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--gray-500);
  width: 32px;
  height: 32px;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.modal-close:hover {
  background: var(--gray-100);
  color: var(--gray-700);
}

.modal-body {
  padding: var(--spacing-lg);
}

.modal-body h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-top: var(--spacing-lg);
  margin-bottom: var(--spacing-sm);
  color: var(--gray-800);
}

.modal-body h3:first-child {
  margin-top: 0;
}

.modal-body ul {
  list-style-position: inside;
  color: var(--gray-600);
  line-height: 1.8;
}

/* Footer */
.footer {
  background: var(--gray-900);
  color: white;
  padding: var(--spacing-2xl) 0;
  margin-top: auto;
}

.footer-content {
  display: grid;
  gap: var(--spacing-xl);
  text-align: center;
}

.footer-lab-name {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: var(--spacing-xs);
}

.footer-description {
  color: var(--gray-400);
  font-size: 0.875rem;
}

.footer-links {
  display: flex;
  gap: var(--spacing-lg);
  justify-content: center;
  flex-wrap: wrap;
}

.footer-link {
  color: var(--gray-400);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer-link:hover {
  color: white;
}

.footer-copyright {
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--gray-800);
  font-size: 0.875rem;
  color: var(--gray-500);
}

/* Back to Top Button */
.back-to-top {
  position: fixed;
  bottom: var(--spacing-xl);
  right: var(--spacing-xl);
  background: var(--primary);
  color: white;
  border: none;
  border-radius: var(--radius-full);
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: var(--shadow-lg);
  transition: all var(--transition-normal);
  z-index: var(--z-sticky);
  font-size: 1.25rem;
}

.back-to-top:hover {
  background: var(--primary-dark);
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
}

/* Responsive Design */
@media (max-width: 768px) {
  .container {
    padding: 0 var(--spacing-md);
  }

  .hero {
    padding: var(--spacing-2xl) 0 var(--spacing-xl);
  }

  .hero-title {
    font-size: 1.75rem;
  }

  .hero-subtitle {
    font-size: 1rem;
  }

  .header-nav .nav-text {
    display: none;
  }

  /* Results remain single column on all screens */
  .results-grid {
    grid-template-columns: 1fr;
  }

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .filter-chips {
    justify-content: flex-start;
    overflow-x: auto;
    flex-wrap: nowrap;
    padding-bottom: var(--spacing-sm);
  }

  .research-grid {
    grid-template-columns: 1fr;
  }

  .results-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .results-meta {
    width: 100%;
    justify-content: space-between;
  }

  .modal-content {
    margin: var(--spacing-md);
  }

  .back-to-top {
    bottom: var(--spacing-md);
    right: var(--spacing-md);
  }

  /* Adjust result card for mobile */
  .result-card {
    padding: var(--spacing-md);
  }

  .score-bar {
    max-width: 80px;
  }
}

@media (max-width: 480px) {
  .logo-title {
    font-size: 1rem;
  }

  .tagline {
    display: none;
  }

  .search-box {
    padding: var(--spacing-md);
  }

  #searchInput {
    min-height: 60px;
  }

  .empty-actions {
    flex-direction: column;
    width: 100%;
  }

  .empty-actions button,
  .empty-actions a {
    width: 100%;
    justify-content: center;
  }
}

/* Print Styles */
@media print {
  .header,
  .footer,
  .back-to-top,
  .modal,
  .search-form,
  .quick-filters {
    display: none;
  }

  .results-grid {
    grid-template-columns: 1fr;
  }

  .research-card {
    page-break-inside: avoid;
  }
}

/* Animation Classes */
.fade-in {
  animation: fadeIn var(--transition-normal);
}

.slide-up {
  animation: slideUp var(--transition-normal);
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Focus Styles for Accessibility */
*:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

button:focus-visible,
a:focus-visible {
  outline-offset: 4px;
}

/* Research Grid */
.research-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-2xl);
}

/* Help text */
.help-text {
  font-size: 0.875rem;
  color: var(--gray-500);
  text-align: center;
  margin-top: var(--spacing-sm);
}

/* Load more button */
.load-more-wrapper {
  text-align: center;
  padding: var(--spacing-xl) 0;
}

.load-more-button {
  background: white;
  border: 2px solid var(--primary);
  color: var(--primary);
  padding: var(--spacing-sm) var(--spacing-xl);
  border-radius: var(--radius-md);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.load-more-button:hover {
  background: var(--primary);
  color: white;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}