/* ===== CSS VARIABLES ===== */
:root {
  /* Backgrounds */
  --bg-primary: #0a0e14;
  --bg-secondary: #0f1419;
  --bg-card: #151b23;
  --bg-card-hover: #1a222c;
  
  /* Text */
  --text-primary: #e6edf3;
  --text-secondary: #9ca3af;
  --text-muted: #6b7280;
  
  /* Status Colors */
  --status-recruiting: #4ade80;
  --status-not-yet: #fbbf24;
  --status-invitation: #a78bfa;
  
  /* Effort Colors */
  --effort-low: #4ade80;
  --effort-medium: #fbbf24;
  --effort-high: #f87171;
  
  /* Accents */
  --accent-primary: #22d3ee;
  --accent-secondary: #a78bfa;
  
  /* Typography - Atkinson Hyperlegible for accessibility */
  --font-primary: 'Atkinson Hyperlegible', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', Consolas, monospace;
  
  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  
  /* Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 300ms ease;
}

/* ===== NETWORK BANNER ===== */
.network-banner {
  background: var(--bg-secondary);
  text-align: center;
  padding: var(--space-xs) var(--space-md);
  font-size: 0.75rem;
  color: var(--text-muted);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.network-banner a {
  color: var(--accent-primary);
  font-weight: 600;
}

.network-banner a:hover {
  text-decoration: underline;
}

/* ===== RESET & BASE ===== */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 18px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-primary);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
}

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

a:hover {
  text-decoration: underline;
}

/* ===== HEADER ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg-primary);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  padding: var(--space-md) var(--space-xl);
}

.header-content {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  text-decoration: none;
  color: var(--text-primary);
  font-size: 1.25rem;
  font-weight: 700;
}

.logo:hover {
  text-decoration: none;
}

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

.logo-suffix {
  color: var(--accent-primary);
}

.last-updated {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
  display: flex;
  gap: var(--space-xs);
}

/* ===== HERO ===== */
.hero {
  text-align: center;
  padding: var(--space-2xl) var(--space-xl) var(--space-xl);
  max-width: 800px;
  margin: 0 auto;
}

.hero h1 {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: var(--space-sm);
}

.hero-subtitle {
  color: var(--text-secondary);
  font-size: 1.1rem;
}

/* Quick Stats */
.quick-stats {
  display: flex;
  justify-content: center;
  gap: var(--space-2xl);
  margin-top: var(--space-xl);
}

.stat {
  text-align: center;
}

.stat-value {
  display: block;
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--accent-primary);
  font-family: var(--font-mono);
}

.stat-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* ===== FILTERS BAR ===== */
.filters-bar {
  max-width: 1200px;
  margin: 0 auto var(--space-lg);
  padding: 0 var(--space-xl);
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
}

.search-wrapper {
  flex: 1;
  min-width: 200px;
}

.search-wrapper input {
  width: 100%;
  background: var(--bg-card);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-md);
  padding: var(--space-sm) var(--space-md);
  color: var(--text-primary);
  font-family: var(--font-primary);
  font-size: 1rem;
}

.search-wrapper input::placeholder {
  color: var(--text-muted);
}

.search-wrapper input:focus {
  outline: none;
  border-color: var(--accent-primary);
}

.filter-select {
  background: var(--bg-card);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-md);
  padding: var(--space-sm) var(--space-md);
  color: var(--text-primary);
  font-family: var(--font-primary);
  font-size: 0.9rem;
  cursor: pointer;
}

.filter-select:focus {
  outline: none;
  border-color: var(--accent-primary);
}

.filter-select option {
  background: var(--bg-card);
  color: var(--text-primary);
}

/* ===== RESULTS BAR ===== */
.results-bar {
  max-width: 1200px;
  margin: 0 auto var(--space-md);
  padding: 0 var(--space-xl);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

#resultsCount {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.view-toggle {
  display: flex;
  gap: var(--space-xs);
}

.view-btn {
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: var(--text-muted);
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 0.8rem;
  font-family: var(--font-primary);
  transition: var(--transition-fast);
}

.view-btn:hover {
  border-color: rgba(255, 255, 255, 0.2);
  color: var(--text-secondary);
}

.view-btn.active {
  background: var(--accent-primary);
  color: var(--bg-primary);
  border-color: var(--accent-primary);
}

/* ===== TRIALS GRID ===== */
.trials-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-xl) var(--space-2xl);
}

.trials-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: var(--space-lg);
}

/* Compact view */
.trials-grid.compact {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

/* ===== TRIAL CARD ===== */
.trial-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  cursor: pointer;
  transition: var(--transition-normal);
  border: 1px solid transparent;
}

.trial-card:hover {
  background: var(--bg-card-hover);
  transform: translateY(-2px);
  border-color: rgba(255, 255, 255, 0.1);
}

/* Card Header */
.card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: var(--space-md);
  gap: var(--space-sm);
}

/* Status Badge */
.status-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-sm);
  white-space: nowrap;
}

.status-badge.recruiting {
  background: rgba(74, 222, 128, 0.2);
  color: var(--status-recruiting);
}

.status-badge.not-yet {
  background: rgba(251, 191, 36, 0.2);
  color: var(--status-not-yet);
}

.status-badge.invitation {
  background: rgba(167, 139, 250, 0.2);
  color: var(--status-invitation);
}

.status-badge::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
}

/* Effort Badge */
.effort-badge {
  font-size: 0.7rem;
  font-weight: 700;
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-sm);
  white-space: nowrap;
}

.effort-badge.low {
  background: rgba(74, 222, 128, 0.2);
  color: var(--effort-low);
}

.effort-badge.medium {
  background: rgba(251, 191, 36, 0.2);
  color: var(--effort-medium);
}

.effort-badge.high {
  background: rgba(248, 113, 113, 0.2);
  color: var(--effort-high);
}

/* Card Title */
.card-title {
  font-size: 1.1rem;
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: var(--space-sm);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* Card Meta */
.card-intervention {
  color: var(--accent-primary);
  font-weight: 600;
  margin-bottom: var(--space-sm);
}

.card-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  font-size: 0.8rem;
  color: var(--text-muted);
}

.card-meta span {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

/* Card Footer */
.card-footer {
  margin-top: var(--space-md);
  padding-top: var(--space-md);
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.card-sponsor {
  font-size: 0.75rem;
  color: var(--text-muted);
  max-width: 80%;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.btn-bookmark {
  background: transparent;
  border: none;
  font-size: 1.25rem;
  color: var(--text-muted);
  cursor: pointer;
  transition: var(--transition-fast);
  padding: var(--space-xs);
}

.btn-bookmark:hover,
.btn-bookmark.active {
  color: var(--accent-primary);
}

/* ===== COMPACT VIEW CARD ===== */
.trial-card.compact {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md);
}

.trial-card.compact .card-header {
  margin-bottom: 0;
  flex-shrink: 0;
}

.trial-card.compact .card-title {
  margin-bottom: 0;
  flex: 1;
  -webkit-line-clamp: 1;
}

.trial-card.compact .effort-badge {
  flex-shrink: 0;
}

/* ===== MODAL ===== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  z-index: 200;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition-normal);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-xl);
}

.modal-overlay.open {
  opacity: 1;
  visibility: visible;
}

.modal {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  max-width: 700px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  position: relative;
}

.modal-close {
  position: absolute;
  top: var(--space-md);
  right: var(--space-md);
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 1.5rem;
  cursor: pointer;
  z-index: 10;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  transition: var(--transition-fast);
}

.modal-close:hover {
  background: rgba(255, 255, 255, 0.1);
  color: var(--text-primary);
}

.modal-content {
  padding: var(--space-xl);
}

/* Modal Sections */
.modal-header {
  margin-bottom: var(--space-xl);
}

.modal-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: var(--space-md);
}

.modal-section {
  margin-bottom: var(--space-xl);
}

.modal-section h3 {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-bottom: var(--space-sm);
}

.modal-section p,
.modal-section li {
  color: var(--text-secondary);
  line-height: 1.8;
}

.modal-section ul {
  list-style: none;
  padding-left: var(--space-md);
}

.modal-section li {
  position: relative;
  padding-left: var(--space-md);
  margin-bottom: var(--space-xs);
}

.modal-section li::before {
  content: "→";
  position: absolute;
  left: 0;
  color: var(--accent-primary);
}

/* CTA Button */
.btn-view-trial {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  background: var(--accent-primary);
  color: var(--bg-primary);
  padding: var(--space-md) var(--space-lg);
  border-radius: var(--radius-md);
  text-decoration: none;
  font-weight: 700;
  transition: var(--transition-fast);
  margin-bottom: var(--space-xl);
}

.btn-view-trial:hover {
  opacity: 0.9;
  text-decoration: none;
}

/* ===== LOAD MORE ===== */
.load-more-container {
  text-align: center;
  margin-top: var(--space-xl);
}

.btn-load-more {
  background: var(--bg-card);
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: var(--text-primary);
  padding: var(--space-md) var(--space-xl);
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-family: var(--font-primary);
  cursor: pointer;
  transition: var(--transition-fast);
}

.btn-load-more:hover {
  background: var(--bg-card-hover);
  border-color: var(--accent-primary);
}

.load-more-count {
  display: block;
  margin-top: var(--space-sm);
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* ===== EMPTY STATE ===== */
.empty-state {
  text-align: center;
  padding: var(--space-2xl);
  max-width: 400px;
  margin: 0 auto;
}

.empty-icon {
  font-size: 3rem;
  display: block;
  margin-bottom: var(--space-md);
}

.empty-state h2 {
  margin-bottom: var(--space-sm);
}

.empty-state p {
  color: var(--text-muted);
  margin-bottom: var(--space-lg);
}

.btn-reset {
  background: var(--accent-primary);
  color: var(--bg-primary);
  border: none;
  padding: var(--space-sm) var(--space-lg);
  border-radius: var(--radius-md);
  font-family: var(--font-primary);
  font-size: 1rem;
  cursor: pointer;
  transition: var(--transition-fast);
}

.btn-reset:hover {
  opacity: 0.9;
}

/* ===== FOOTER ===== */
.site-footer {
  text-align: center;
  padding: var(--space-xl);
  color: var(--text-muted);
  font-size: 0.8rem;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.site-footer p {
  margin-bottom: var(--space-xs);
}

.site-footer a {
  color: var(--text-secondary);
}

.site-footer a:hover {
  color: var(--accent-primary);
}

/* ===== LOADING STATE ===== */
.loading-skeleton {
  background: linear-gradient(
    90deg,
    var(--bg-card) 25%,
    var(--bg-card-hover) 50%,
    var(--bg-card) 75%
  );
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: var(--radius-md);
}

@keyframes shimmer {
  0% {
    background-position: -200% 0;
  }
  100% {
    background-position: 200% 0;
  }
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
  html {
    font-size: 16px;
  }
  
  .site-header {
    padding: var(--space-md);
  }
  
  .header-content {
    flex-direction: column;
    gap: var(--space-sm);
  }
  
  .hero {
    padding: var(--space-xl) var(--space-md);
  }
  
  .hero h1 {
    font-size: 1.75rem;
  }
  
  .quick-stats {
    flex-direction: column;
    gap: var(--space-md);
  }
  
  .stat-value {
    font-size: 2rem;
  }
  
  .filters-bar {
    flex-direction: column;
    padding: 0 var(--space-md);
  }
  
  .filter-select {
    width: 100%;
  }
  
  .results-bar {
    padding: 0 var(--space-md);
    flex-direction: column;
    gap: var(--space-sm);
    align-items: flex-start;
  }
  
  .trials-container {
    padding: 0 var(--space-md) var(--space-xl);
  }
  
  .trials-grid {
    grid-template-columns: 1fr;
  }
  
  .modal-overlay {
    padding: var(--space-md);
  }
  
  .modal-content {
    padding: var(--space-lg);
  }
  
  .modal-title {
    font-size: 1.25rem;
  }
}

/* ===== ACCESSIBILITY: REDUCED MOTION ===== */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  
  html {
    scroll-behavior: auto;
  }
}

/* ===== FOCUS STYLES ===== */
:focus-visible {
  outline: 2px solid var(--accent-primary);
  outline-offset: 2px;
}

/* ===== SELECTION ===== */
::selection {
  background: var(--accent-primary);
  color: var(--bg-primary);
}