/**
 * Timeline Page Styles - Horizontal Scrolling Design
 * 
 * Uses the same card styles as explore page (via index-shared.css and explore.css)
 * Adds timeline-specific horizontal layout and date markers
 */

/* ============================================================================
   Page Layout
   ============================================================================ */

.timeline-page {
  min-height: 100vh;
  background: var(--color-bg-primary);
}

/* ============================================================================
   Hero Section
   ============================================================================ */

.timeline-hero {
  text-align: center;
  padding: 0 var(--spacing-xl);
  max-width: 900px;
  margin: 0 auto;
}

.timeline-hero .hero-brand-title {
  margin-top: 0;
  margin-bottom: 0;
  padding-top: 3.5rem; /* Align just below hamburger/Create Index buttons (fixed at ~60px from content start) */
}

.timeline-hero .brand-dash {
  font-size: 3rem; /* Match explore page */
}

.timeline-hero .hero-brand-tagline {
  margin-top: var(--spacing-xs);
  margin-bottom: var(--spacing-sm);
}

.timeline-hero .search-container {
  margin-top: var(--spacing-sm);
}

/* ============================================================================
   Timeline Section
   ============================================================================ */

.timeline-section {
  padding: var(--spacing-xl) 0;
}

.timeline-section-title {
  text-align: center;
  margin-bottom: var(--spacing-lg);
  padding: 0 var(--spacing-xl);
}

.timeline-section-title h2 {
  font-size: 2rem;
  font-weight: var(--font-weight-bold);
  color: #ffffff;
  text-shadow: 
    0 0 20px rgba(255, 255, 255, 0.5),
    0 0 40px rgba(255, 255, 255, 0.3);
  margin: 0 0 var(--spacing-xs);
}

.timeline-subtitle {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin: 0;
}

/* ============================================================================
   Filter Bar Container (extends explore.css styles)
   ============================================================================ */

.timeline-section .filter-bar-container {
  margin-bottom: var(--spacing-md);
  display: flex;
  flex-direction: column;
  align-items: center;
}

.timeline-results-info {
  text-align: center;
  margin-top: var(--spacing-sm);
}

.timeline-results-count {
  font-size: 0.8rem;
  color: var(--color-primary);
  font-weight: var(--font-weight-medium);
  text-shadow: 0 0 8px rgba(var(--color-primary-rgb), 0.4);
}

/* ============================================================================
   Timeline Viewport (Horizontal Scroll Container)
   ============================================================================ */

.timeline-viewport {
  position: relative;
  width: 100%;
  overflow: hidden;
}

/* Timeline Track Container */
.timeline-track-container {
  position: relative;
  overflow-x: auto;
  overflow-y: visible;
  padding: var(--spacing-md) 0 var(--spacing-xl);
  scrollbar-width: thin;
  scrollbar-color: rgba(var(--color-primary-rgb), 0.3) transparent;
}

.timeline-track-container::-webkit-scrollbar {
  height: 8px;
}

.timeline-track-container::-webkit-scrollbar-track {
  background: rgba(var(--color-primary-rgb), 0.05);
  border-radius: 4px;
}

.timeline-track-container::-webkit-scrollbar-thumb {
  background: rgba(var(--color-primary-rgb), 0.3);
  border-radius: 4px;
}

.timeline-track-container::-webkit-scrollbar-thumb:hover {
  background: rgba(var(--color-primary-rgb), 0.5);
}

/* Timeline Track */
.timeline-track {
  display: flex;
  gap: var(--spacing-xl);
  padding: 60px var(--spacing-xl) var(--spacing-xl);
  min-width: max-content;
  position: relative;
}

/* Timeline Line (visual connector) - width set by JS via CSS variable to span full scroll width */
.timeline-track::before {
  content: '';
  position: absolute;
  top: 36px;
  left: var(--spacing-xl);
  /* Use CSS variable set by JS, fallback to calc for initial render */
  width: var(--timeline-line-width, calc(100% - var(--spacing-xl) * 2));
  height: 4px;
  background: linear-gradient(90deg,
    transparent,
    rgba(var(--color-primary-rgb), 0.5) 5%,
    rgba(var(--color-primary-rgb), 0.5) 95%,
    transparent
  );
  border-radius: 2px;
  z-index: 0;
  box-shadow: 0 0 12px rgba(var(--color-primary-rgb), 0.3);
}

/* ============================================================================
   Timeline Cards (wrapper for date node + index card)
   ============================================================================ */

.timeline-card {
  position: relative;
  width: 340px; /* Match grid card width for consistency */
  min-height: var(--timeline-card-height, auto);
  flex-shrink: 0;
  z-index: 1;
}

/* Ensure all cards have uniform height based on tallest card */
.timeline-track {
  align-items: stretch;
}

.timeline-card .index-card {
  height: 100%;
  display: flex;
  flex-direction: column;
}

/* Date Node (dot on timeline) */
.timeline-node {
  position: absolute;
  left: 50%;
  top: -44px;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  z-index: 2;
}

.node-dot {
  width: 16px;
  height: 16px;
  background: var(--color-primary);
  border: 3px solid var(--color-bg-primary);
  border-radius: 50%;
  box-shadow: 
    0 0 0 3px rgba(var(--color-primary-rgb), 0.3),
    0 0 20px rgba(var(--color-primary-rgb), 0.6);
  margin-top: 4px;
}

.node-date {
  position: absolute;
  top: -22px;
  white-space: nowrap;
  font-size: 0.7rem;
  font-weight: var(--font-weight-bold);
  color: white;
  text-shadow: 0 0 12px rgba(var(--color-primary-rgb), 0.8);
  letter-spacing: 0.03em;
  background: rgba(var(--color-primary-rgb), 0.15);
  padding: 3px 8px;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(var(--color-primary-rgb), 0.3);
}

/* Index card within timeline - uniform height */
.timeline-card > .index-card {
  margin-top: var(--spacing-md);
  flex: 1;
}

/* ============================================================================
   Scroll Indicators
   ============================================================================ */

.scroll-indicator {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 48px;
  height: 48px;
  background: rgba(var(--color-bg-card-rgb), 0.9);
  border: 1px solid rgba(var(--color-primary-rgb), 0.3);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  cursor: pointer;
  transition: all 0.2s ease;
  z-index: 10;
  backdrop-filter: blur(10px);
}

.scroll-indicator:hover {
  background: rgba(var(--color-primary-rgb), 0.15);
  border-color: var(--color-primary);
  box-shadow: 0 0 20px rgba(var(--color-primary-rgb), 0.4);
}

.scroll-left {
  left: var(--spacing-md);
}

.scroll-right {
  right: var(--spacing-md);
}

/* ============================================================================
   No Date Section
   ============================================================================ */

.no-date-section {
  padding: var(--spacing-xl);
  margin-top: var(--spacing-xl);
  border-top: 1px solid rgba(var(--color-primary-rgb), 0.1);
  max-width: 1190px;
  margin-left: auto;
  margin-right: auto;
}

.no-date-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-lg);
}

.no-date-label {
  font-size: 0.8rem;
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.no-date-count {
  padding: 0.2rem 0.5rem;
  background: rgba(var(--color-primary-rgb), 0.1);
  border-radius: var(--radius-pill);
  font-size: 0.7rem;
  color: var(--color-primary);
}

/* Use browse-grid from explore.css for undated cards */
.no-date-cards.browse-grid {
  max-width: 100%;
}

/* ============================================================================
   Loading & Empty States
   ============================================================================ */

.timeline-loading,
.timeline-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-4xl);
  color: var(--color-text-muted);
  text-align: center;
}

.loading-spinner {
  width: 48px;
  height: 48px;
  border: 3px solid rgba(var(--color-primary-rgb), 0.2);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin-bottom: var(--spacing-md);
}

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

.timeline-empty svg {
  color: var(--color-primary);
  opacity: 0.5;
  margin-bottom: var(--spacing-md);
}

.timeline-empty p {
  margin-bottom: var(--spacing-lg);
}

.btn-reset-filter {
  padding: 0.5rem 1.25rem;
  background: rgba(var(--color-primary-rgb), 0.15);
  border: 1px solid rgba(var(--color-primary-rgb), 0.3);
  border-radius: var(--radius-pill);
  color: var(--color-primary);
  font-size: 0.85rem;
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn-reset-filter:hover {
  background: rgba(var(--color-primary-rgb), 0.25);
  border-color: var(--color-primary);
}

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

@media (max-width: 768px) {
  .timeline-card {
    width: 280px;
  }
  
  .scroll-indicator {
    width: 40px;
    height: 40px;
  }
  
  .no-date-section {
    padding: var(--spacing-md);
  }
}

/* ============================================================================
   Animations
   ============================================================================ */

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

.timeline-card {
  animation: fadeInUp 0.4s ease-out;
  animation-fill-mode: both;
}

.timeline-card:nth-child(1) { animation-delay: 0.05s; }
.timeline-card:nth-child(2) { animation-delay: 0.1s; }
.timeline-card:nth-child(3) { animation-delay: 0.15s; }
.timeline-card:nth-child(4) { animation-delay: 0.2s; }
.timeline-card:nth-child(5) { animation-delay: 0.25s; }
.timeline-card:nth-child(6) { animation-delay: 0.3s; }
.timeline-card:nth-child(7) { animation-delay: 0.35s; }
.timeline-card:nth-child(8) { animation-delay: 0.4s; }