/* ============================================
   HISTORICAL MODE - Stage 1
   The Growth of a Global Problem (1980-2025)
   ============================================ */

#historical-mode {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  padding: var(--space-lg);
  background: rgba(0, 0, 0, 0.3);
  backdrop-filter: blur(10px);
  pointer-events: auto;
  transition: opacity 1s ease-out, backdrop-filter 0.5s ease;
  overflow-y: auto;
  overflow-x: hidden;
  min-height: 100vh;
}

/* Custom Scrollbar for Historical Mode */
#historical-mode::-webkit-scrollbar {
  width: 8px;
}

#historical-mode::-webkit-scrollbar-track {
  background: rgba(0, 0, 0, 0.3);
}

#historical-mode::-webkit-scrollbar-thumb {
  background: linear-gradient(
    180deg,
    rgba(0, 212, 255, 0.3),
    rgba(0, 100, 150, 0.5)
  );
  border-radius: 4px;
}

#historical-mode::-webkit-scrollbar-thumb:hover {
  background: linear-gradient(
    180deg,
    rgba(0, 212, 255, 0.5),
    rgba(0, 100, 150, 0.7)
  );
}

#historical-mode.fade-out {
  opacity: 0;
  pointer-events: none;
  backdrop-filter: blur(0px);
}

/* Hero Title */
.historical-title {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  animation: title-appear 2s ease-out;
  margin-bottom: var(--space-xl);
  min-height: 40vh;
  max-height: 60vh;
}

@keyframes title-appear {
  from {
    opacity: 0;
    transform: translateY(-30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.historical-title h1 {
  font-size: 56px;
  font-weight: 700;
  letter-spacing: 0.18em;
  color: var(--color-primary);
  text-shadow: 0 0 50px rgba(0, 212, 255, 0.8), 0 4px 12px rgba(0, 0, 0, 0.9);
  margin-bottom: var(--space-xl);
  line-height: 1.3;
  text-align: center;
}

.historical-title .subtitle {
  font-size: 16px;
  color: rgba(255, 255, 255, 0.7);
  letter-spacing: 0.25em;
  text-transform: uppercase;
  font-weight: 600;
  opacity: 1;
  margin-bottom: var(--space-lg);
}

/* Debris Display - Center */
.debris-display {
  margin-top: var(--space-xxl);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-md);
}

.debris-label {
  font-size: 13px;
  font-weight: 700;
  color: rgba(0, 212, 255, 0.9);
  letter-spacing: 0.35em;
  text-transform: uppercase;
  opacity: 1;
  text-shadow: 0 0 20px rgba(0, 212, 255, 0.5);
}

.debris-number {
  font-size: 120px;
  font-weight: 900;
  color: rgba(255, 136, 0, 0.95);
  text-shadow: 0 0 60px rgba(255, 136, 0, 0.8), 0 8px 16px rgba(0, 0, 0, 0.9);
  letter-spacing: 0.05em;
  font-family: var(--font-mono);
  animation: debris-pulse 2s ease-in-out infinite;
  transition: color 0.5s ease, text-shadow 0.5s ease;
}

/* Color changes based on severity */
.debris-number.low {
  color: rgba(0, 255, 136, 0.95);
  text-shadow: 0 0 60px rgba(0, 255, 136, 0.8), 0 8px 16px rgba(0, 0, 0, 0.9);
}

.debris-number.medium {
  color: rgba(255, 204, 0, 0.95);
  text-shadow: 0 0 60px rgba(255, 204, 0, 0.8), 0 8px 16px rgba(0, 0, 0, 0.9);
}

.debris-number.high {
  color: rgba(255, 136, 0, 0.95);
  text-shadow: 0 0 60px rgba(255, 136, 0, 0.8), 0 8px 16px rgba(0, 0, 0, 0.9);
}

.debris-number.critical {
  color: rgba(255, 0, 85, 0.95);
  text-shadow: 0 0 60px rgba(255, 0, 85, 0.8), 0 8px 16px rgba(0, 0, 0, 0.9);
}

@keyframes debris-pulse {
  0%,
  100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.02);
  }
}

.year-label {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text-dim);
  letter-spacing: 0.2em;
  text-transform: uppercase;
}

/* Timeline Controls */
.timeline-controls {
  width: 100%;
  max-width: 900px;
  background: rgba(0, 0, 0, 0.9);
  border: 1px solid rgba(0, 212, 255, 0.4);
  border-radius: 12px;
  padding: var(--space-xl) var(--space-lg);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.9), 0 0 0 1px rgba(0, 212, 255, 0.3),
    inset 0 1px 0 rgba(255, 255, 255, 0.08), 0 0 80px rgba(0, 212, 255, 0.15);
  backdrop-filter: blur(30px);
  animation: controls-appear 1.5s ease-out 0.5s backwards;
  margin-bottom: var(--space-lg);
  flex-shrink: 0;
}

@keyframes controls-appear {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.timeline-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-lg);
}

.timeline-label {
  font-size: 11px;
  color: rgba(0, 212, 255, 0.8);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  font-weight: 700;
}

.debris-count {
  font-size: 14px;
  color: var(--color-primary);
  font-weight: 700;
  letter-spacing: 0.1em;
}

.debris-count .number {
  font-size: 20px;
  margin-right: var(--space-xs);
}

/* Slider Container */
.slider-container {
  position: relative;
  margin-bottom: var(--space-xl);
}

/* Custom Slider */
#time-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 8px;
  background: linear-gradient(
    90deg,
    rgba(0, 212, 255, 0.2),
    rgba(0, 212, 255, 0.4)
  );
  border-radius: 4px;
  outline: none;
  cursor: pointer;
  transition: all 0.3s ease;
}

#time-slider:hover {
  background: linear-gradient(
    90deg,
    rgba(0, 212, 255, 0.3),
    rgba(0, 212, 255, 0.5)
  );
}

/* Slider Thumb - Webkit */
#time-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 24px;
  height: 24px;
  background: linear-gradient(
    135deg,
    var(--color-primary),
    rgba(0, 240, 255, 1)
  );
  border-radius: 50%;
  cursor: pointer;
  box-shadow: 0 0 20px rgba(0, 212, 255, 0.6), 0 4px 12px rgba(0, 0, 0, 0.5);
  transition: all 0.3s ease;
}

#time-slider::-webkit-slider-thumb:hover {
  transform: scale(1.2);
  box-shadow: 0 0 30px rgba(0, 212, 255, 0.8), 0 6px 16px rgba(0, 0, 0, 0.6);
}

/* Slider Thumb - Firefox */
#time-slider::-moz-range-thumb {
  width: 24px;
  height: 24px;
  background: linear-gradient(
    135deg,
    var(--color-primary),
    rgba(0, 240, 255, 1)
  );
  border-radius: 50%;
  border: none;
  cursor: pointer;
  box-shadow: 0 0 20px rgba(0, 212, 255, 0.6), 0 4px 12px rgba(0, 0, 0, 0.5);
  transition: all 0.3s ease;
}

#time-slider::-moz-range-thumb:hover {
  transform: scale(1.2);
  box-shadow: 0 0 30px rgba(0, 212, 255, 0.8), 0 6px 16px rgba(0, 0, 0, 0.6);
}

/* Year Markers */
.year-markers {
  display: flex;
  justify-content: space-between;
  margin-top: var(--space-sm);
  padding: 0 4px;
}

.year-marker {
  font-size: 10px;
  color: var(--color-text-dim);
  font-weight: 600;
  letter-spacing: 0.05em;
}

/* Control Buttons */
.playback-controls {
  display: flex;
  gap: var(--space-md);
  align-items: center;
}

.play-btn {
  flex: 1;
  padding: var(--space-lg) var(--space-xl);
  background: linear-gradient(
    135deg,
    rgba(0, 180, 230, 0.9),
    rgba(0, 212, 255, 1)
  );
  border: 1px solid var(--color-primary);
  border-radius: 6px;
  color: #000;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  cursor: pointer;
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 0 8px 24px rgba(0, 212, 255, 0.3),
    0 0 0 1px rgba(0, 212, 255, 0.5), inset 0 1px 0 rgba(255, 255, 255, 0.3);
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
}

.play-btn::before {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.3),
    transparent
  );
  transition: left 0.6s ease;
}

.play-btn:hover::before {
  left: 100%;
}

.play-btn:hover {
  transform: translateY(-3px) scale(1.02);
  background: linear-gradient(
    135deg,
    rgba(0, 212, 255, 1),
    rgba(0, 240, 255, 1)
  );
  box-shadow: 0 12px 36px rgba(0, 212, 255, 0.5),
    0 0 0 2px rgba(0, 212, 255, 0.7), inset 0 1px 0 rgba(255, 255, 255, 0.4),
    0 0 60px rgba(0, 212, 255, 0.3);
}

.play-btn:active {
  transform: translateY(-1px) scale(0.99);
}

.play-btn.playing {
  background: linear-gradient(
    135deg,
    rgba(255, 136, 0, 0.9),
    rgba(255, 204, 0, 1)
  );
  border-color: var(--color-elevated);
}

.play-btn.playing:hover {
  background: linear-gradient(
    135deg,
    rgba(255, 204, 0, 1),
    rgba(255, 240, 0, 1)
  );
  box-shadow: 0 12px 36px rgba(255, 204, 0, 0.5),
    0 0 0 2px rgba(255, 204, 0, 0.7);
}

.play-icon {
  font-size: 18px;
  transition: transform 0.3s ease;
}

.play-btn.playing .play-icon {
  animation: pulse-icon 1.5s ease-in-out infinite;
}

@keyframes pulse-icon {
  0%,
  100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.1);
  }
}

.speed-control {
  display: flex;
  gap: var(--space-xs);
}

.speed-btn {
  padding: var(--space-sm) var(--space-md);
  background: rgba(0, 0, 0, 0.6);
  border: 1px solid rgba(0, 212, 255, 0.2);
  border-radius: 4px;
  color: var(--color-text-secondary);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.1em;
  cursor: pointer;
  transition: all 0.3s ease;
}

.speed-btn:hover {
  background: rgba(0, 0, 0, 0.8);
  border-color: rgba(0, 212, 255, 0.4);
  color: var(--color-primary);
}

.speed-btn.active {
  background: rgba(0, 212, 255, 0.2);
  border-color: var(--color-primary);
  color: var(--color-primary);
  box-shadow: 0 0 10px rgba(0, 212, 255, 0.3);
}

/* Progress Indicator */
.progress-indicator {
  margin-top: var(--space-lg);
  text-align: center;
  font-size: 10px;
  color: rgba(255, 255, 255, 0.5);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  font-weight: 500;
}

/* Skip Intro Button */
.skip-intro-btn {
  margin-top: var(--space-lg);
  padding: var(--space-md) var(--space-xl);
  background: rgba(0, 0, 0, 0.6);
  border: 1px solid rgba(0, 212, 255, 0.3);
  border-radius: 24px;
  color: var(--color-primary);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.2em;
  cursor: pointer;
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  backdrop-filter: blur(10px);
  flex-shrink: 0;
  align-self: center;
}

.skip-intro-btn:hover {
  background: rgba(0, 0, 0, 0.8);
  border-color: var(--color-primary);
  transform: translateX(4px);
  box-shadow: 0 4px 16px rgba(0, 212, 255, 0.3);
}

.skip-intro-btn:active {
  transform: translateX(2px);
}

.skip-icon {
  font-size: 16px;
  transition: transform 0.3s ease;
}

.skip-intro-btn:hover .skip-icon {
  transform: translateX(4px);
}

/* Windows Performance Optimizations */
@media screen and (-ms-high-contrast: active), (-ms-high-contrast: none) {
  /* Internet Explorer/Edge optimizations */
  .debris-number {
    animation-duration: 2.5s !important;
  }

  .play-btn::before {
    animation-duration: 0.8s !important;
  }

  .timeline-controls {
    backdrop-filter: blur(8px) !important;
  }
}

/* Windows-specific optimizations */
@supports (-webkit-appearance: none) {
  /* Webkit-based browsers on Windows */
  .debris-number {
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
  }

  .timeline-controls {
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
  }
}

/* Responsive */
@media (max-width: 768px) {
  #historical-mode {
    padding: var(--space-md);
    justify-content: flex-start;
  }

  .historical-title {
    min-height: 30vh;
    max-height: 50vh;
    margin-bottom: var(--space-lg);
  }

  .historical-title h1 {
    font-size: 28px;
    line-height: 1.2;
  }

  .historical-title .subtitle {
    font-size: 14px;
  }

  .debris-display {
    margin-top: var(--space-lg);
  }

  .debris-label {
    font-size: 11px;
  }

  .debris-number {
    font-size: 64px;
  }

  .year-label {
    font-size: 13px;
  }

  .timeline-controls {
    padding: var(--space-lg);
    margin-bottom: var(--space-md);
  }

  .playback-controls {
    flex-direction: column;
    gap: var(--space-md);
  }

  .play-btn {
    width: 100%;
  }

  .speed-control {
    width: 100%;
    justify-content: center;
  }

  .skip-intro-btn {
    margin-top: var(--space-md);
    padding: var(--space-sm) var(--space-lg);
    font-size: 10px;
  }
}

@media (max-width: 480px) {
  #historical-mode {
    padding: var(--space-sm);
  }

  .historical-title {
    min-height: 25vh;
    max-height: 40vh;
  }

  .historical-title h1 {
    font-size: 24px;
    line-height: 1.1;
  }

  .debris-number {
    font-size: 48px;
  }

  .timeline-controls {
    max-width: calc(100vw - 2rem);
    padding: var(--space-md);
  }

  .skip-intro-btn {
    padding: var(--space-sm) var(--space-md);
    font-size: 9px;
  }
}

/* Additional responsive breakpoints for better support */
@media (max-height: 600px) {
  .historical-title {
    min-height: 20vh;
    max-height: 35vh;
  }

  .debris-number {
    font-size: 80px;
  }

  .timeline-controls {
    padding: var(--space-md);
  }
}

@media (max-height: 480px) {
  .historical-title {
    min-height: 15vh;
    max-height: 30vh;
  }

  .debris-number {
    font-size: 60px;
  }

  .timeline-controls {
    padding: var(--space-sm);
  }

  .skip-intro-btn {
    margin-top: var(--space-sm);
  }
}

/* Landscape orientation adjustments */
@media (max-width: 1024px) and (orientation: landscape) {
  .historical-title {
    min-height: 20vh;
    max-height: 40vh;
  }

  .debris-number {
    font-size: 80px;
  }

  .timeline-controls {
    padding: var(--space-md);
  }
}