:root {
  --color-bg: #ffffff;
  --color-bg-secondary: #f8f9fa;
  --color-text: #1a1a1a;
  --color-text-muted: #5c5c5c;
  --color-accent: #2d5a7b;
  --color-accent-light: #4a7fa8;
  --color-accent-bg: #f0f5f8;
  --color-border: #e0e0e0;
  --color-border-light: #f0f0f0;
  --color-success: #3d7a5c;
  --color-warning: #b8860b;
  --color-error: #c0392b;
  --font-serif: 'Crimson Pro', Georgia, serif;
  --font-sans: 'Source Sans 3', -apple-system, sans-serif;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.06);
  --shadow-lg: 0 8px 30px rgba(0,0,0,0.08);
  --radius: 4px;
  --transition: 0.2s ease;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-serif);
  font-weight: 600;
  line-height: 1.25;
  color: var(--color-text);
}

h1 { font-size: 2.75rem; letter-spacing: -0.02em; }
h2 { font-size: 2rem; letter-spacing: -0.01em; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

p { margin-bottom: 1rem; }

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover { color: var(--color-accent-light); }

/* Layout */
.app-container {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Header */
.header {
  background: var(--color-bg-secondary);
  border-bottom: 1px solid var(--color-border);
  padding: 1rem 2rem;
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(10px);
  background: rgba(255,255,255,0.95);
}

.header-inner {
  max-width: 1400px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.logo-icon {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.logo-icon svg {
  width: 36px;
  height: 36px;
}

.logo-text {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.02em;
}

.nav {
  display: flex;
  gap: 2rem;
}

.nav-link {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-muted);
  padding: 0.5rem 0;
  position: relative;
}

.nav-link:hover { color: var(--color-text); }

.nav-link.active {
  color: var(--color-accent);
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--color-accent);
}

/* Hero Section */
.hero {
  padding: 4rem 2rem;
  text-align: center;
  background: linear-gradient(180deg, var(--color-bg-secondary) 0%, var(--color-bg) 100%);
  border-bottom: 1px solid var(--color-border-light);
}

.hero-inner {
  max-width: 800px;
  margin: 0 auto;
}

.hero h1 {
  margin-bottom: 1rem;
}

.hero-subtitle {
  font-size: 1.2rem;
  color: var(--color-text-muted);
  max-width: 600px;
  margin: 0 auto 2rem;
  line-height: 1.7;
}

.hero-citation {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  font-style: italic;
  margin-top: 2rem;
  padding: 1rem 1.5rem;
  background: var(--color-accent-bg);
  border-radius: var(--radius);
  display: inline-block;
}

/* Main Content */
.main-content {
  flex: 1;
  padding: 3rem 2rem;
  max-width: 1400px;
  margin: 0 auto;
  width: 100%;
}

/* Cards */
.card {
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 2rem;
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition), transform var(--transition);
}

.card:hover {
  box-shadow: var(--shadow-md);
}

.card-header {
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--color-border-light);
}

.card-title {
  font-size: 1.35rem;
  margin-bottom: 0.25rem;
}

.card-description {
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

/* Analysis Types Grid */
.analysis-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  margin-top: 1.5rem;
}

@media (max-width: 1100px) {
  .analysis-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 600px) {
  .analysis-grid {
    grid-template-columns: 1fr;
  }
}

.analysis-card {
  cursor: pointer;
  position: relative;
  overflow: hidden;
  background: white;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.5rem;
  text-align: center;
  transition: all var(--transition);
}

.analysis-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: var(--color-accent);
  transform: scaleX(0);
  transition: transform var(--transition);
}

.analysis-card:hover::before,
.analysis-card.selected::before {
  transform: scaleX(1);
}

.analysis-card:hover {
  border-color: var(--color-accent-light);
  box-shadow: var(--shadow-md);
}

.analysis-card.selected {
  border-color: var(--color-accent);
  background: var(--color-accent-bg);
}

.analysis-icon {
  width: 48px;
  height: 48px;
  margin: 0 auto 1rem;
  color: var(--color-accent);
  display: flex;
  align-items: center;
  justify-content: center;
}

.analysis-icon svg {
  width: 100%;
  height: 100%;
}

.analysis-title {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--color-text);
}

.analysis-description {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  line-height: 1.5;
}

/* Variable Selector */
.variable-selector {
  margin-bottom: 1.5rem;
}

.selector-label {
  display: block;
  font-weight: 500;
  margin-bottom: 0.75rem;
  color: var(--color-text);
}

.variable-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.variable-chip {
  display: inline-flex;
  align-items: center;
  padding: 0.5rem 1rem;
  background: white;
  border: 1px solid var(--color-border);
  border-radius: 50px;
  font-size: 0.9rem;
  color: var(--color-text);
  cursor: pointer;
  transition: all var(--transition);
  font-family: var(--font-sans);
}

.variable-chip:hover {
  border-color: var(--color-accent);
  background: var(--color-accent-bg);
}

.variable-chip.selected {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: white;
}

.variable-chip.selected:hover {
  background: var(--color-accent-light);
  border-color: var(--color-accent-light);
}

/* Grouping Variable Select */
.grouping-select {
  padding: 0.75rem 1rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 0.95rem;
  background: white;
  color: var(--color-text);
  min-width: 200px;
  cursor: pointer;
}

.grouping-select:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-bg);
}

/* File Upload */
.upload-zone {
  border: 2px dashed var(--color-border);
  border-radius: var(--radius);
  padding: 3rem 2rem;
  text-align: center;
  cursor: pointer;
  transition: all var(--transition);
  background: var(--color-bg);
}

.upload-zone:hover,
.upload-zone.dragging {
  border-color: var(--color-accent);
  background: var(--color-accent-bg);
}

.upload-icon {
  width: 48px;
  height: 48px;
  margin: 0 auto 1rem;
  color: var(--color-text-muted);
}

.upload-text {
  font-size: 1rem;
  margin-bottom: 0.5rem;
}

.upload-hint {
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

.upload-input {
  display: none;
}

/* Data Preview */
.data-preview {
  margin-top: 1.5rem;
  max-height: 300px;
  overflow: auto;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
}

.data-table th,
.data-table td {
  padding: 0.75rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--color-border-light);
}

.data-table th {
  background: var(--color-bg);
  font-weight: 600;
  position: sticky;
  top: 0;
}

.data-table tr:hover td {
  background: var(--color-accent-bg);
}

/* Variable Selection */
.variable-section {
  margin-top: 2rem;
}

.variable-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 1rem;
  margin-top: 1rem;
}

.variable-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  cursor: pointer;
  transition: all var(--transition);
}

.variable-item:hover {
  border-color: var(--color-accent);
}

.variable-item.selected {
  background: var(--color-accent-bg);
  border-color: var(--color-accent);
}

.variable-checkbox {
  width: 18px;
  height: 18px;
  border: 2px solid var(--color-border);
  border-radius: 3px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
}

.variable-item.selected .variable-checkbox {
  background: var(--color-accent);
  border-color: var(--color-accent);
}

.variable-checkbox svg {
  width: 12px;
  height: 12px;
  color: white;
  opacity: 0;
  transition: opacity var(--transition);
}

.variable-item.selected .variable-checkbox svg {
  opacity: 1;
}

.variable-name {
  font-size: 0.9rem;
  font-weight: 500;
}

.variable-type {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  margin-left: auto;
}

/* Select Dropdowns */
.select-group {
  margin-bottom: 1.5rem;
}

.select-label {
  display: block;
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.select-input {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-bg-secondary);
  font-family: var(--font-sans);
  font-size: 0.9rem;
  color: var(--color-text);
  cursor: pointer;
  transition: border-color var(--transition);
}

.select-input:hover,
.select-input:focus {
  border-color: var(--color-accent);
  outline: none;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 600;
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  transition: all var(--transition);
}

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

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

.btn-primary:disabled {
  background: var(--color-border);
  cursor: not-allowed;
}

.btn-secondary {
  background: var(--color-bg);
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.btn-secondary:hover {
  background: var(--color-border-light);
}

.btn-icon {
  width: 18px;
  height: 18px;
}

/* Plot Container */
.plot-container {
  margin-top: 2rem;
  padding: 2rem;
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

.plot-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--color-border-light);
}

.plot-title {
  font-size: 1.2rem;
}

.plot-actions {
  display: flex;
  gap: 0.75rem;
}

.plot-area {
  min-height: 500px;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Interpretation Guide */
.interpretation-guide {
  margin-top: 2rem;
  padding: 1.5rem;
  background: var(--color-accent-bg);
  border-radius: var(--radius);
  border-left: 4px solid var(--color-accent);
}

.interpretation-header {
  margin-bottom: 1rem;
}

.interpretation-guide h4 {
  margin-bottom: 0.25rem;
  color: var(--color-accent);
  font-size: 1.1rem;
}

.interpretation-subtitle {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin: 0;
}

.interpretation-content {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.interpretation-tip {
  padding: 0.75rem 1rem;
  background: white;
  border-radius: var(--radius);
  font-size: 0.9rem;
  line-height: 1.5;
  border: 1px solid var(--color-border-light);
}

.interpretation-tip b {
  color: var(--color-text);
}

.interpretation-list {
  list-style: none;
}

.interpretation-list li {
  padding: 0.5rem 0;
  padding-left: 1.5rem;
  position: relative;
  font-size: 0.9rem;
}

.interpretation-list li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--color-accent);
}

/* Footer */
.footer {
  background: var(--color-text);
  color: rgba(255,255,255,0.7);
  padding: 3rem 2rem;
  margin-top: auto;
}

.footer-inner {
  max-width: 1400px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 3rem;
}

.footer-brand {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  color: white;
  margin-bottom: 1rem;
}

.footer-desc {
  font-size: 0.9rem;
  line-height: 1.7;
  max-width: 400px;
}

.footer-title {
  font-family: var(--font-serif);
  font-size: 1rem;
  color: white;
  margin-bottom: 1rem;
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: 0.5rem;
}

.footer-links a {
  color: rgba(255,255,255,0.7);
  font-size: 0.9rem;
}

.footer-links a:hover {
  color: white;
}

.footer-bottom {
  max-width: 1400px;
  margin: 2rem auto 0;
  padding-top: 2rem;
  border-top: 1px solid rgba(255,255,255,0.1);
  font-size: 0.8rem;
  text-align: center;
}

/* Responsive */
@media (max-width: 768px) {
  h1 { font-size: 2rem; }
  h2 { font-size: 1.5rem; }
  
  .header { padding: 1rem; }
  .header-inner { flex-direction: column; gap: 1rem; }
  .nav { gap: 1rem; }
  
  .hero { padding: 2rem 1rem; }
  .main-content { padding: 1.5rem 1rem; }
  
  .footer-inner {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
}

/* Privacy Notice */
.privacy-notice {
  background: linear-gradient(135deg, #e8f5e9 0%, #f1f8e9 100%);
  border-bottom: 1px solid #c8e6c9;
  padding: 1rem 2rem;
}

.privacy-inner {
  max-width: 1400px;
  margin: 0 auto;
  display: flex;
  align-items: flex-start;
  gap: 1rem;
}

.privacy-inner svg {
  width: 24px;
  height: 24px;
  color: var(--color-success);
  flex-shrink: 0;
  margin-top: 2px;
}

.privacy-inner strong {
  display: block;
  color: var(--color-success);
  margin-bottom: 0.25rem;
}

.privacy-inner p {
  margin: 0;
  font-size: 0.9rem;
  color: #2e7d32;
  line-height: 1.5;
}

/* Upload Section with Demo Button */
.upload-section {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.upload-section .upload-zone {
  flex: 1;
  min-width: 280px;
}

.upload-divider {
  display: flex;
  align-items: center;
  color: var(--color-text-muted);
  font-size: 0.85rem;
}

.btn-demo {
  background: linear-gradient(135deg, var(--color-accent) 0%, #e8740b 100%);
  color: white;
  padding: 1rem 1.5rem;
  font-size: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  transition: all var(--transition);
  font-weight: 600;
  white-space: nowrap;
}

.btn-demo:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(217, 95, 2, 0.3);
}

.btn-demo svg {
  width: 18px;
  height: 18px;
}

.demo-section {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
}

.demo-hint {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin: 0;
  text-align: center;
}

/* Enhanced Interpretation Guide */
.interpretation-guide h4 {
  margin-bottom: 1rem;
  color: var(--color-primary);
}

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

.interpretation-list li {
  padding: 0.75rem 1rem;
  margin-bottom: 0.5rem;
  background: var(--color-bg);
  border-radius: var(--radius);
  border-left: 3px solid var(--color-primary);
  font-size: 0.9rem;
  line-height: 1.5;
}

.interpretation-list li:last-child {
  border-left-color: var(--color-accent);
  background: rgba(217, 95, 2, 0.08);
}

.interpretation-list b {
  color: var(--color-text);
}

/* Modal */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 2rem;
  backdrop-filter: blur(4px);
}

.modal {
  background: white;
  border-radius: 8px;
  width: 100%;
  max-width: 800px;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-lg);
  animation: modalSlideIn 0.2s ease;
}

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

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.5rem;
  border-bottom: 1px solid var(--color-border);
}

.modal-header h3 {
  margin: 0;
  font-size: 1.25rem;
}

.modal-close {
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  color: var(--color-text-muted);
  transition: color var(--transition);
}

.modal-close:hover {
  color: var(--color-text);
}

.modal-close svg {
  width: 20px;
  height: 20px;
}

.modal-body {
  padding: 1.5rem;
  overflow-y: auto;
  flex: 1;
}

.modal-description {
  margin-bottom: 1rem;
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

.code-block {
  background: #1e1e1e;
  color: #d4d4d4;
  padding: 1.5rem;
  border-radius: var(--radius);
  overflow-x: auto;
  font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
  font-size: 0.85rem;
  line-height: 1.6;
  white-space: pre-wrap;
  word-wrap: break-word;
}

.modal-footer {
  display: flex;
  gap: 1rem;
  justify-content: flex-end;
  padding: 1.5rem;
  border-top: 1px solid var(--color-border);
  background: var(--color-bg);
}

/* Footer Privacy Note */
.footer-privacy {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 1rem;
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.6);
}

.footer-privacy svg {
  width: 16px;
  height: 16px;
}

/* Loading spinner */
.spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--color-border);
  border-top-color: var(--color-accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

/* Responsive adjustments for new elements */
@media (max-width: 768px) {
  .upload-section {
    flex-direction: column;
  }
  
  .upload-section .upload-zone {
    width: 100%;
  }
  
  .upload-divider {
    width: 100%;
    justify-content: center;
  }
  
  .upload-divider::before,
  .upload-divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--color-border);
    margin: 0 1rem;
  }
  
  .btn-demo {
    width: 100%;
    justify-content: center;
  }
  
  .modal {
    margin: 1rem;
    max-height: calc(100vh - 2rem);
  }
  
  .modal-footer {
    flex-direction: column;
  }
  
  .modal-footer .btn {
    width: 100%;
  }
}

/* Authors Section */
.authors-section {
  background: var(--color-bg);
  padding: 4rem 2rem;
}

.section-inner {
  max-width: 1200px;
  margin: 0 auto;
}

.section-title {
  font-family: var(--font-serif);
  font-size: 2rem;
  text-align: center;
  margin-bottom: 0.5rem;
  color: var(--color-primary);
}

.section-subtitle {
  text-align: center;
  color: var(--color-text-muted);
  margin-bottom: 2.5rem;
  font-size: 1.1rem;
}

.authors-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
}

.author-card {
  background: white;
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow);
  transition: transform var(--transition), box-shadow var(--transition);
}

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

.author-avatar {
  width: 100px;
  height: 100px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1rem;
  overflow: hidden;
  border: 3px solid var(--color-border-light);
  box-shadow: var(--shadow-sm);
}

.author-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.author-avatar svg {
  width: 40px;
  height: 40px;
  color: white;
}

.author-info {
  text-align: center;
}

.author-name {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  margin-bottom: 0.25rem;
  color: var(--color-text);
}

.author-title {
  font-size: 0.9rem;
  color: var(--color-primary);
  font-weight: 500;
  margin-bottom: 0.25rem;
}

.author-affiliation {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-bottom: 1rem;
}

.author-bio {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  line-height: 1.6;
  margin-bottom: 1rem;
}

.author-links {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

.author-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.85rem;
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition);
}

.author-link:hover {
  color: var(--color-accent);
}

.author-link svg {
  width: 14px;
  height: 14px;
}

/* Citation Section */
.citation-section {
  background: white;
  padding: 4rem 2rem;
  border-top: 1px solid var(--color-border);
}

.citation-box {
  background: var(--color-bg);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin-bottom: 2rem;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

.citation-formats {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
  justify-content: center;
}

.citation-format-btn {
  padding: 0.5rem 1rem;
  border: 1px solid var(--color-border);
  background: white;
  border-radius: var(--radius);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
}

.citation-format-btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.citation-format-btn.active {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: white;
}

.citation-text {
  background: white;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1rem;
  font-size: 0.9rem;
  line-height: 1.6;
  white-space: pre-wrap;
  word-wrap: break-word;
  margin-bottom: 1rem;
  max-height: 200px;
  overflow-y: auto;
}

.citation-copy-btn {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin: 0 auto;
}

.citation-copy-btn svg {
  width: 16px;
  height: 16px;
}

.paper-link {
  text-align: center;
}

.paper-link .btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.paper-link .btn svg {
  width: 16px;
  height: 16px;
}

@media (max-width: 768px) {
  .authors-grid {
    grid-template-columns: 1fr;
  }
  
  .section-title {
    font-size: 1.5rem;
  }
}

/* Data Protection Panel */
.data-protection-panel {
  margin-top: 2rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: white;
  overflow: hidden;
}

.protection-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 1.25rem;
  background: linear-gradient(135deg, #f8f9fa 0%, #f1f3f4 100%);
  border-bottom: 1px solid var(--color-border);
}

.protection-title {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 600;
  color: var(--color-text);
}

.protection-title svg {
  width: 20px;
  height: 20px;
  color: var(--color-primary);
}

/* Toggle Switch */
.toggle-switch {
  position: relative;
  display: inline-block;
  width: 48px;
  height: 24px;
}

.toggle-switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.toggle-slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: #ccc;
  transition: 0.3s;
  border-radius: 24px;
}

.toggle-slider:before {
  position: absolute;
  content: "";
  height: 18px;
  width: 18px;
  left: 3px;
  bottom: 3px;
  background-color: white;
  transition: 0.3s;
  border-radius: 50%;
}

.toggle-switch input:checked + .toggle-slider {
  background-color: var(--color-primary);
}

.toggle-switch input:checked + .toggle-slider:before {
  transform: translateX(24px);
}

.protection-options {
  padding: 1.25rem;
}

.protection-description {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin-bottom: 1.25rem;
  line-height: 1.5;
}

.protection-option {
  margin-bottom: 1rem;
  padding: 0.75rem;
  background: var(--color-bg);
  border-radius: var(--radius);
}

.protection-option label {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
}

.protection-option label span {
  font-weight: 500;
  color: var(--color-text);
}

.protection-option label small {
  flex-basis: 100%;
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin-left: 1.5rem;
}

.protection-option input[type="checkbox"] {
  width: 16px;
  height: 16px;
  accent-color: var(--color-primary);
}

.protection-option input[type="range"] {
  width: 100%;
  margin-top: 0.5rem;
  accent-color: var(--color-primary);
}

.protection-note {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  padding: 0.75rem;
  background: rgba(45, 90, 123, 0.08);
  border-radius: var(--radius);
  font-size: 0.85rem;
  color: var(--color-primary);
  margin-top: 1rem;
}

.protection-note svg {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
  margin-top: 2px;
}

/* Messages */
.message {
  padding: 1rem 1.5rem;
  border-radius: var(--radius);
  font-size: 0.9rem;
  margin-bottom: 1rem;
}

.message-success {
  background: #e8f5e9;
  color: var(--color-success);
  border: 1px solid #c8e6c9;
}

.message-error {
  background: #ffebee;
  color: var(--color-error);
  border: 1px solid #ffcdd2;
}

.message-info {
  background: var(--color-accent-bg);
  color: var(--color-accent);
  border: 1px solid #b3d4e8;
}

/* Two-column layout for analysis */
.analysis-layout {
  display: grid;
  grid-template-columns: 350px 1fr;
  gap: 2rem;
}

.analysis-sidebar {
  position: sticky;
  top: 100px;
  align-self: start;
}

@media (max-width: 1024px) {
  .analysis-layout {
    grid-template-columns: 1fr;
  }
  
  .analysis-sidebar {
    position: static;
  }
}

/* ==================== LANDING PAGE STYLES ==================== */

/* Hero Landing Variation */
.hero-landing {
  padding: 6rem 2rem 5rem;
  text-align: center;
  background: #ffffff;
  color: var(--color-text);
  min-height: 60vh;
  display: flex;
  align-items: center;
  justify-content: center;
  border-bottom: 1px solid var(--color-border);
}

.hero-landing h1 {
  font-size: 3.5rem;
  color: var(--color-text);
  margin-bottom: 1.5rem;
  line-height: 1.15;
}

.hero-landing .hero-subtitle {
  font-size: 1.3rem;
  color: var(--color-text-muted);
  max-width: 700px;
  margin: 0 auto 2rem;
}

.hero-badge {
  display: inline-block;
  background: var(--color-accent-bg);
  color: var(--color-accent);
  padding: 0.5rem 1.25rem;
  border-radius: 50px;
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 2.5rem;
}

.btn-large {
  padding: 1rem 2rem;
  font-size: 1.1rem;
}

.btn-large svg {
  width: 20px;
  height: 20px;
}

.hero-landing .hero-citation {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  max-width: 600px;
  margin: 0 auto;
  background: var(--color-bg-secondary);
  padding: 1rem 1.5rem;
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
}

/* Tool Hero - Smaller */
.hero-tool {
  padding: 4rem 2rem 3rem;
  min-height: auto;
}

.hero-tool h1 {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

/* Landing Sections */
.landing-section {
  padding: 5rem 2rem;
  background: white;
  border-bottom: 1px solid var(--color-border-light);
}

.landing-section:last-of-type {
  border-bottom: none;
}

.section-inner {
  max-width: 1100px;
  margin: 0 auto;
}

.section-header {
  text-align: center;
  margin-bottom: 3rem;
}

.section-title {
  font-size: 2.5rem;
  margin-bottom: 1rem;
  color: var(--color-text);
}

.section-subtitle {
  font-size: 1.2rem;
  color: var(--color-text-muted);
  max-width: 650px;
  margin: 0 auto;
}

/* Problem Section */
.problem-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  margin-bottom: 3rem;
}

.problem-card {
  background: var(--color-bg-secondary);
  padding: 2rem;
  border-radius: var(--radius);
  text-align: center;
  border: 1px solid var(--color-border);
}

.problem-stat {
  font-family: var(--font-serif);
  font-size: 3rem;
  font-weight: 700;
  color: var(--color-error);
  margin-bottom: 0.5rem;
}

.problem-label {
  font-weight: 600;
  font-size: 1.1rem;
  margin-bottom: 1rem;
  color: var(--color-text);
}

.problem-card p {
  color: var(--color-text-muted);
  font-size: 0.95rem;
}

.crisis-quote {
  max-width: 800px;
  margin: 0 auto;
  padding: 2rem;
  background: var(--color-accent-bg);
  border-left: 4px solid var(--color-accent);
  border-radius: var(--radius);
  text-align: center;
}

.crisis-quote blockquote {
  font-family: var(--font-serif);
  font-size: 1.3rem;
  font-style: italic;
  color: var(--color-text);
  line-height: 1.6;
  margin: 0 0 1rem 0;
}

.crisis-quote cite {
  display: block;
  font-style: normal;
  font-size: 1rem;
  color: var(--color-text-muted);
  font-weight: 500;
}

/* Solution Section */
.solution-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
}

.solution-text h3 {
  font-size: 1.4rem;
  margin-bottom: 1rem;
  color: var(--color-accent);
}

.solution-text p {
  margin-bottom: 1.5rem;
  color: var(--color-text-muted);
  line-height: 1.7;
}

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

.solution-list li {
  padding: 0.75rem 0;
  padding-left: 1.5rem;
  position: relative;
  color: var(--color-text-muted);
}

.solution-list li::before {
  content: "→";
  position: absolute;
  left: 0;
  color: var(--color-accent);
  font-weight: bold;
}

.solution-list li strong {
  color: var(--color-text);
}

/* Visual Mockup */
.visual-mockup {
  background: #1e1e1e;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.mockup-header {
  background: #333;
  padding: 0.75rem 1rem;
  display: flex;
  gap: 0.5rem;
}

.mockup-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: #555;
}

.mockup-dot:nth-child(1) { background: #ff5f56; }
.mockup-dot:nth-child(2) { background: #ffbd2e; }
.mockup-dot:nth-child(3) { background: #27ca40; }

.mockup-content {
  padding: 2rem;
  background: white;
}

.mockup-chart {
  position: relative;
}

.mockup-svg {
  width: 100%;
  height: auto;
}

.mockup-label {
  position: absolute;
  top: 10px;
  right: 10px;
  background: rgba(231, 76, 60, 0.1);
  color: #e74c3c;
  padding: 0.25rem 0.75rem;
  border-radius: 4px;
  font-size: 0.8rem;
  font-weight: 600;
}

/* Editors Section */
.editors-content {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  margin-bottom: 3rem;
}

.editors-card {
  background: white;
  padding: 2rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border-light);
}

.editors-icon {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.editors-card h3 {
  font-size: 1.25rem;
  margin-bottom: 1rem;
  color: var(--color-text);
}

.editors-card p {
  color: var(--color-text-muted);
  margin-bottom: 1rem;
  line-height: 1.6;
}

.editors-card ul {
  list-style: none;
  padding: 0;
}

.editors-card ul li {
  padding: 0.5rem 0;
  color: var(--color-text-muted);
  border-bottom: 1px solid var(--color-border-light);
}

.editors-card ul li:last-child {
  border-bottom: none;
}

.editors-card ul li strong {
  color: var(--color-text);
}

.sample-text {
  background: var(--color-accent-bg);
  padding: 1rem;
  border-radius: var(--radius);
  font-size: 0.9rem;
}

.sample-text strong {
  display: block;
  margin-bottom: 0.5rem;
  color: var(--color-accent);
}

.sample-text em {
  color: var(--color-text-muted);
  font-style: normal;
  display: block;
}

.editors-cta {
  text-align: center;
  padding: 3rem;
  background: linear-gradient(135deg, var(--color-accent-bg) 0%, #dbeaf3 100%);
  border-radius: var(--radius);
}

.editors-cta h3 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
}

.editors-cta p {
  color: var(--color-text-muted);
  max-width: 600px;
  margin: 0 auto 1.5rem;
}

/* Benefits Section */
.benefits-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.benefit-card {
  text-align: center;
  padding: 2rem;
}

.benefit-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
}

.benefit-card h3 {
  font-size: 1.2rem;
  margin-bottom: 0.75rem;
  color: var(--color-text);
}

.benefit-card p {
  color: var(--color-text-muted);
  font-size: 0.95rem;
}

/* CTA Section */
.cta-section {
  background: linear-gradient(135deg, #2d5a7b 0%, #1a3a4f 100%) !important;
  color: white;
  text-align: center;
  padding: 5rem 2rem;
}

.cta-section h2 {
  color: white;
  font-size: 2.25rem;
  margin-bottom: 1rem;
}

.cta-section p {
  font-size: 1.2rem;
  opacity: 0.9;
  margin-bottom: 2rem;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* Responsive for Landing */
@media (max-width: 900px) {
  .hero-landing h1 {
    font-size: 2.5rem;
  }
  
  .problem-grid,
  .editors-content,
  .benefits-grid {
    grid-template-columns: 1fr;
  }
  
  .solution-content {
    grid-template-columns: 1fr;
  }
  
  .solution-visual {
    order: -1;
  }
}

@media (max-width: 600px) {
  .hero-landing h1 {
    font-size: 2rem;
  }
  
  .hero-landing .hero-subtitle {
    font-size: 1.1rem;
  }
  
  .section-title {
    font-size: 1.8rem;
  }
  
  .landing-section {
    padding: 3rem 1rem;
  }
}