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

:root {
  /* Premium Earthy Palette */
  --bg-color: hsl(24, 15%, 8%);
  --card-bg: hsl(24, 12%, 13%);
  --card-border: hsl(24, 10%, 20%);
  --text-main: hsl(30, 20%, 95%);
  --text-muted: hsl(30, 10%, 70%);
  
  --accent-terracotta: hsl(15, 75%, 55%);
  --accent-jade: hsl(155, 55%, 45%);
  --accent-gold: hsl(42, 85%, 55%);
  --accent-blue: hsl(195, 60%, 50%);
  
  --accent-terracotta-glow: hsla(15, 75%, 55%, 0.15);
  --accent-jade-glow: hsla(155, 55%, 45%, 0.15);
  --accent-gold-glow: hsla(42, 85%, 55%, 0.15);
  
  --font-display: 'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  
  --transition-smooth: all 0.35s cubic-bezier(0.25, 0.8, 0.25, 1);
  --transition-fast: all 0.15s ease;
}

body {
  background-color: var(--bg-color);
  color: var(--text-main);
  font-family: var(--font-body);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  position: relative;
}

/* Subtle background glowing spots for depth */
body::before, body::after {
  content: "";
  position: absolute;
  width: 60vw;
  height: 60vh;
  border-radius: 50%;
  filter: blur(160px);
  z-index: -1;
  opacity: 0.12;
  pointer-events: none;
}
body::before {
  top: -10%;
  left: -10%;
  background: var(--accent-terracotta);
}
body::after {
  bottom: -10%;
  right: -10%;
  background: var(--accent-jade);
}

.container {
  max-width: 1200px;
  width: 90%;
  margin: 0 auto;
  padding: 2.5rem 0;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
}

/* Header Styles */
header {
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-bottom: 0.5rem;
}

h1 {
  font-family: var(--font-display);
  font-size: 2.75rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, var(--text-main) 30%, var(--accent-gold) 70%, var(--accent-terracotta));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.subtitle {
  font-size: 1.15rem;
  color: var(--text-muted);
  max-width: 680px;
  margin: 0 auto;
  font-weight: 300;
}

/* Time Comparison Visualizer */
.comparison-container {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 16px;
  padding: 1.5rem 2rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.25);
  backdrop-filter: blur(8px);
}

.comparison-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.comparison-title {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--accent-gold);
}

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

.comparison-stat span {
  color: var(--text-main);
  font-weight: 600;
}

.comparison-bar {
  height: 24px;
  width: 100%;
  background: hsl(24, 10%, 18%);
  border-radius: 12px;
  overflow: hidden;
  display: flex;
  position: relative;
  border: 1px solid rgba(255, 255, 255, 0.05);
}

.bar-segment {
  height: 100%;
  transition: var(--transition-smooth);
  position: relative;
}

.bar-segment.pre-columbian {
  background: linear-gradient(90deg, var(--accent-terracotta) 0%, var(--accent-gold) 100%);
  width: 96.86%; /* Calculated: (16492 / 17026) * 100 */
}

.bar-segment.post-columbus {
  background: var(--accent-blue);
  width: 3.14%; /* Calculated: (534 / 17026) * 100 */
}

.bar-label {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  font-size: 0.75rem;
  font-weight: 700;
  text-shadow: 0 2px 4px rgba(0,0,0,0.8);
  white-space: nowrap;
  pointer-events: none;
}

.pre-columbian .bar-label {
  left: 1.25rem;
  color: var(--text-main);
}

.post-columbus .bar-label {
  right: 0.5rem;
  color: var(--text-main);
  display: none; /* Hide standard text on narrow width */
}

.comparison-legends {
  display: flex;
  gap: 2rem;
  flex-wrap: wrap;
  margin-top: 0.25rem;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
}

.legend-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.legend-dot.pre {
  background: var(--accent-terracotta);
  box-shadow: 0 0 8px var(--accent-terracotta);
}

.legend-dot.post {
  background: var(--accent-blue);
  box-shadow: 0 0 8px var(--accent-blue);
}

/* Timeline Layout Grid */
.timeline-workspace {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

@media (min-width: 900px) {
  .timeline-workspace {
    grid-template-columns: 1.5fr 1fr;
    align-items: start;
  }
}

/* Interactive Timeline Controls */
.slider-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 16px;
  padding: 2rem;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.25);
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.active-year-display {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
}

.year-number {
  font-family: var(--font-display);
  font-size: 4rem;
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--accent-gold);
  text-shadow: 0 0 20px var(--accent-gold-glow);
  transition: var(--transition-fast);
}

.year-era {
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.slider-wrapper {
  position: relative;
  padding: 1rem 0;
}

/* Custom Range Input */
input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 8px;
  border-radius: 4px;
  background: hsl(24, 10%, 20%);
  outline: none;
  cursor: pointer;
  position: relative;
  z-index: 2;
}

/* Chrome/Safari Range Thumb */
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--accent-terracotta);
  border: 3px solid var(--text-main);
  box-shadow: 0 0 15px rgba(226, 92, 56, 0.5), 0 4px 10px rgba(0,0,0,0.4);
  cursor: grab;
  transition: var(--transition-fast);
}

input[type="range"]::-webkit-slider-thumb:active {
  cursor: grabbing;
  transform: scale(1.15);
  background: var(--accent-gold);
  box-shadow: 0 0 20px rgba(230, 168, 34, 0.7);
}

/* Firefox Range Thumb */
input[type="range"]::-moz-range-thumb {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--accent-terracotta);
  border: 3px solid var(--text-main);
  box-shadow: 0 0 15px rgba(226, 92, 56, 0.5), 0 4px 10px rgba(0,0,0,0.4);
  cursor: grab;
  transition: var(--transition-fast);
}

input[type="range"]::-moz-range-thumb:active {
  cursor: grabbing;
  transform: scale(1.15);
  background: var(--accent-gold);
}

/* Tick Marks container */
.slider-ticks {
  position: relative;
  width: 100%;
  height: 30px;
  margin-top: 0.5rem;
}

.tick-mark {
  position: absolute;
  top: 0;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
  cursor: pointer;
}

.tick-line {
  width: 2px;
  height: 8px;
  background-color: hsl(24, 10%, 25%);
  transition: var(--transition-fast);
}

.tick-mark:hover .tick-line,
.tick-mark.active .tick-line {
  background-color: var(--accent-gold);
  height: 12px;
}

.tick-label {
  font-size: 0.7rem;
  color: var(--text-muted);
  font-weight: 500;
  transition: var(--transition-fast);
  white-space: nowrap;
}

.tick-mark:hover .tick-label,
.tick-mark.active .tick-label {
  color: var(--text-main);
  font-weight: 600;
}

/* Milestone Selectors */
.milestones-section {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.milestones-title {
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.milestones-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
  gap: 0.75rem;
}

.milestone-btn {
  background: hsl(24, 10%, 16%);
  border: 1px solid var(--card-border);
  color: var(--text-muted);
  padding: 0.6rem 0.8rem;
  border-radius: 8px;
  font-size: 0.8rem;
  font-family: var(--font-body);
  font-weight: 500;
  cursor: pointer;
  text-align: left;
  transition: var(--transition-fast);
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.milestone-btn:hover {
  background: hsl(24, 10%, 20%);
  color: var(--text-main);
  border-color: var(--accent-gold);
  transform: translateY(-2px);
}

.milestone-btn.active {
  background: var(--accent-terracotta-glow);
  color: var(--accent-terracotta);
  border-color: var(--accent-terracotta);
  font-weight: 600;
}

.milestone-btn-year {
  font-size: 0.7rem;
  opacity: 0.8;
  font-family: var(--font-display);
}

/* Info Detail Card */
.info-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 16px;
  padding: 2.25rem;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.25);
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  position: relative;
  overflow: hidden;
  transition: border-color var(--transition-smooth);
}

/* Accent top border strip matching the active civilization color */
.info-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 5px;
  background: var(--active-accent, var(--accent-terracotta));
  transition: var(--transition-smooth);
}

.info-card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
}

.civ-badge-wrapper {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.civ-region {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--active-accent, var(--accent-terracotta));
  transition: var(--transition-smooth);
}

.civ-title {
  font-family: var(--font-display);
  font-size: 1.85rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.2;
}

.civ-span {
  font-size: 0.85rem;
  font-weight: 600;
  background: rgba(255, 255, 255, 0.05);
  padding: 0.3rem 0.6rem;
  border-radius: 6px;
  color: var(--text-muted);
  border: 1px solid rgba(255, 255, 255, 0.05);
  white-space: nowrap;
}

.civ-summary {
  font-size: 1rem;
  color: var(--text-main);
  line-height: 1.7;
}

.civ-details {
  border-top: 1px solid var(--card-border);
  padding-top: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.civ-details-title {
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
}

.achievements-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.achievements-list li {
  font-size: 0.9rem;
  position: relative;
  padding-left: 1.5rem;
  color: var(--text-muted);
}

.achievements-list li::before {
  content: "✦";
  position: absolute;
  left: 0;
  top: 0;
  color: var(--active-accent, var(--accent-terracotta));
  transition: var(--transition-smooth);
}

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

/* Interactive SVG Map Container */
.map-container {
  background: hsl(24, 10%, 10%);
  border: 1px solid var(--card-border);
  border-radius: 12px;
  padding: 1rem;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 180px;
  position: relative;
}

.map-svg {
  height: 100%;
  width: auto;
  opacity: 0.65;
  transition: var(--transition-smooth);
}

/* Interactive map paths for geographic highlighting */
.map-region {
  fill: hsl(24, 8%, 20%);
  stroke: hsl(24, 10%, 30%);
  stroke-width: 1.5px;
  transition: var(--transition-smooth);
}

.map-region.active-region {
  fill: var(--active-accent-glow, var(--accent-terracotta-glow));
  stroke: var(--active-accent, var(--accent-terracotta));
  filter: drop-shadow(0 0 6px var(--active-accent, var(--accent-terracotta)));
}

/* Animations for switching states */
.fade-in-up {
  animation: fadeInUp 0.45s cubic-bezier(0.25, 0.8, 0.25, 1) forwards;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Footer Section */
footer {
  text-align: center;
  padding: 2rem 0;
  border-top: 1px solid var(--card-border);
  color: var(--text-muted);
  font-size: 0.85rem;
  margin-top: auto;
}

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

footer a:hover {
  text-decoration: underline;
  color: var(--text-main);
}

/* Responsive adjustments */
@media (max-width: 600px) {
  h1 {
    font-size: 2rem;
  }
  .subtitle {
    font-size: 1rem;
  }
  .comparison-container {
    padding: 1rem;
  }
  .comparison-legends {
    gap: 1rem;
  }
  .slider-card {
    padding: 1.25rem;
  }
  .info-card {
    padding: 1.5rem;
  }
  .info-card-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }
  .year-number {
    font-size: 3rem;
  }
}