/**
 * Papedex Main Stylesheet
 *
 * Imports all CSS modules in the correct order.
 */

/* Design System & Variables */
@import url('variables.css');

/* Base Styles & Utilities */
@import url('base.css');

/* Component Styles */
@import url('components.css');

/* ============================================================================
   Layout Components
   ============================================================================ */

/* Navigation Bar */
.navbar {
  position: sticky;
  top: 0;
  z-index: var(--z-index-sticky);
  background-color: var(--bg-elevated);
  border-bottom: 1px solid var(--border-primary);
  box-shadow: var(--shadow-sm);
}

.navbar-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--navbar-height);
}

.navbar-brand {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-primary-600);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
}

.navbar-brand:hover {
  color: var(--color-primary-700);
  text-decoration: none;
}

.navbar-nav {
  display: flex;
  align-items: center;
  gap: var(--spacing-6);
  list-style: none;
  margin: 0;
  padding: 0;
}

.navbar-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: var(--font-weight-medium);
  transition: color var(--transition-fast);
}

.navbar-link:hover {
  color: var(--text-primary);
  text-decoration: none;
}

.navbar-link.active {
  color: var(--color-primary-600);
}

/* Hero Section */
.hero {
  padding: var(--spacing-20) 0;
  background: linear-gradient(135deg, var(--color-primary-50) 0%, var(--bg-secondary) 100%);
}

.hero-title {
  font-size: var(--font-size-4xl);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--spacing-6);
  line-height: var(--line-height-tight);
}

.hero-subtitle {
  font-size: var(--font-size-xl);
  color: var(--text-secondary);
  margin-bottom: var(--spacing-8);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* Search Box */
.search-box {
  max-width: 800px;
  margin: 0 auto var(--spacing-8);
  position: relative;
}

.search-input-wrapper {
  position: relative;
  display: flex;
  gap: var(--spacing-3);
}

.search-input {
  flex: 1;
  padding: var(--spacing-4) var(--spacing-6);
  font-size: var(--font-size-lg);
  border-radius: var(--radius-xl);
  border: 2px solid var(--border-primary);
  transition: all var(--transition-fast);
}

.search-input:focus {
  border-color: var(--color-primary-500);
  box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.1);
}


.search-hint {
  margin: var(--spacing-3) 0 0;
  font-size: var(--font-size-sm);
  color: var(--text-secondary, #6b7280);
}
.search-page { padding-top: var(--spacing-8); }
.search-hint a { margin-left: 0.25em; }

/* Short-query nudge above results */
.nudge {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-3);
  padding: var(--spacing-3) var(--spacing-4);
  margin-bottom: var(--spacing-6);
  border: 1px solid #fcd34d;
  background: #fffbeb;
  border-radius: var(--radius-lg, 8px);
  font-size: var(--font-size-sm);
}
.nudge-icon { flex: none; }
.nudge-close {
  flex: none;
  margin-left: auto;
  background: none;
  border: none;
  font-size: 1.1rem;
  line-height: 1;
  cursor: pointer;
  color: inherit;
  opacity: 0.6;
}
.nudge-close:hover { opacity: 1; }

.search-button {
  padding: var(--spacing-4) var(--spacing-8);
  font-size: var(--font-size-lg);
  border-radius: var(--radius-xl);
}

/* Results Grid */
.results-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--spacing-6);
  margin-top: var(--spacing-8);
}

.result-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
  padding: var(--spacing-6);
  transition: all var(--transition-fast);
  cursor: pointer;
}

.result-card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--color-primary-300);
}

.result-title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--spacing-3);
  color: var(--text-primary);
}

.result-meta {
  font-size: var(--font-size-sm);
  color: var(--text-tertiary);
  margin-bottom: var(--spacing-3);
}

.result-abstract {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  line-height: var(--line-height-relaxed);
}

/* Footer */
.footer {
  margin-top: var(--spacing-16, 4rem);
  padding: var(--spacing-4) 0;
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-primary);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-8);
}

.footer-section h4 {
  margin-bottom: var(--spacing-4);
  font-size: var(--font-size-base);
}

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

.footer-links li {
  margin-bottom: var(--spacing-2);
}

.footer-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: var(--font-size-sm);
}

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

.footer-bottom {
  margin-top: var(--spacing-8);
  padding-top: var(--spacing-8);
  border-top: 1px solid var(--border-primary);
  text-align: center;
  color: var(--text-tertiary);
  font-size: var(--font-size-sm);
}

/* ============================================================================
   PubMed Comparison Layout
   ============================================================================ */
.comparison-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-6);
}

.comparison-column {
  min-width: 0; /* prevent grid blowout */
}

.comparison-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-3) var(--spacing-4);
  border-radius: var(--radius-lg);
  margin-bottom: var(--spacing-4);
  font-weight: var(--font-weight-semibold);
}

.comparison-header-papedex {
  background-color: var(--color-primary-50);
  color: var(--color-primary-700);
  border: 1px solid var(--color-primary-200);
}

.comparison-header-pubmed {
  background-color: var(--color-gray-100);
  color: var(--color-gray-700);
  border: 1px solid var(--color-gray-300);
}

.comparison-header .result-count {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-normal);
}

.comparison-overlap {
  padding: var(--spacing-3) var(--spacing-4);
  background-color: var(--color-success-light);
  border: 1px solid var(--color-success);
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-6);
  font-size: var(--font-size-sm);
  color: var(--color-success);
  text-align: center;
}

.card.shared-result {
  border-left: 3px solid var(--color-success);
}

.shared-badge {
  display: inline-flex;
  align-items: center;
  padding: 0.125rem 0.375rem;
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  border-radius: var(--radius-full);
  background-color: var(--color-success-light);
  color: var(--color-success);
}

.comparison-column .card {
  padding: var(--spacing-4);
}

.comparison-column .card h3 {
  font-size: var(--font-size-base);
}

/* ============================================================================
   Responsive Design
   ============================================================================ */

@media (max-width: 768px) {
  .hero-title {
    font-size: var(--font-size-3xl);
  }

  .hero-subtitle {
    font-size: var(--font-size-lg);
  }

  .search-input-wrapper {
    flex-direction: column;
  }

  .search-button {
    width: 100%;
  }

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

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

  .navbar-nav {
    gap: var(--spacing-3);
  }

  .footer-content {
    grid-template-columns: 1fr;
    gap: var(--spacing-6);
  }
}

@media (max-width: 640px) {
  .navbar-container {
    flex-wrap: wrap;
  }

  .navbar-nav {
    width: 100%;
    justify-content: space-around;
    margin-top: var(--spacing-3);
  }
}

/* Simple footer (the four-column marketing footer linked to pages that never existed) */
.footer-simple {
  margin-top: 0;
  padding-top: 0;
  border-top: none;
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-4);
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-6) 0;
}
.footer-links-inline { display: flex; gap: var(--spacing-6); flex-wrap: wrap; }
.footer-simple p { margin: 0; font-size: var(--font-size-sm); color: var(--text-secondary, #6b7280); }