/* ==========================================================================
   ML NEWS Slide Viewer - Cinematic Editorial Theme
   ========================================================================== */

:root {
  /* Colors */
  --bg-primary: #0a0a0a;
  --bg-secondary: #111111;
  --bg-elevated: #1a1a1a;
  --bg-overlay: rgba(10, 10, 10, 0.95);

  --text-primary: #f5f5f0;
  --text-secondary: #8a8a85;
  --text-muted: #5a5a55;

  --accent: #e5a158;
  --accent-dim: rgba(229, 161, 88, 0.4);
  --accent-glow: rgba(229, 161, 88, 0.15);

  --edge-flash: rgba(255, 255, 255, 0.5);
  --section-border: rgba(255, 255, 255, 0.08);

  /* Transitions */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);

  /* Durations */
  --duration-fast: 150ms;
  --duration-normal: 200ms;
  --duration-slow: 300ms;
  --duration-section: 400ms;
  --duration-bundle: 250ms;

  /* Spacing */
  --tab-bar-height: 56px;
  --progress-height: 3px;
  --nav-arrow-size: 48px;

  /* Typography */
  --font-ui: 'Geist', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-display: 'Instrument Serif', Georgia, serif;

  /* Tag chips */
  --chip-bg: transparent;
  --chip-bg-selected: rgba(255, 255, 255, 0.1);
  --chip-border: rgba(255, 255, 255, 0.12);
  --chip-border-selected: rgba(255, 255, 255, 0.2);
  --chip-border-new: var(--accent-dim);
  --chip-shadow-present: 0 0 0 2px var(--accent-dim), 0 0 12px var(--accent-glow), 0 0 20px rgba(229, 161, 88, 0.15);
  --chip-radius: 16px;
}

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

html, body {
  height: 100%;
  overflow: hidden;
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-ui);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  user-select: none;
  -webkit-user-select: none;
  touch-action: pan-x pan-y;
}

/* ==========================================================================
   Top Trigger Zone
   ========================================================================== */

#top-trigger {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 40px;
  z-index: 890;
  pointer-events: auto;
}

/* ==========================================================================
   Tab Bar
   ========================================================================== */

#tab-bar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 900;
  background: linear-gradient(180deg, var(--bg-overlay) 0%, rgba(10, 10, 10, 0.85) 100%);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  transform: translateY(0);
  opacity: 1;
  transition:
    transform var(--duration-slow) var(--ease-out),
    opacity var(--duration-slow) var(--ease-out);
}

#tab-bar.collapsed {
  transform: translateY(-100%);
  opacity: 0;
  pointer-events: none;
}

#tab-bar.dimmed {
  opacity: 0.5;
}

.tab-bar-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--tab-bar-height);
  padding: 0 20px;
  max-width: 1400px;
  margin: 0 auto;
}

.tabs {
  display: flex;
  flex: 1;
  justify-content: space-around;
  gap: 16px;
  max-width: 800px;
}

.tab {
  display: flex;
  flex: 1;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 8px 14px;
  background: transparent;
  border: none;
  border-radius: 8px;
  color: var(--text-secondary);
  font-family: var(--font-ui);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.01em;
  cursor: pointer !important; /* Force cursor on entire button */
  transition:
    color var(--duration-fast) ease,
    background var(--duration-fast) ease;
}

.tab:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.05);
}

.tab.active {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.08);
}

.tab-name {
  text-transform: uppercase;
  letter-spacing: 0.05em;
  cursor: pointer; /* Ensure cursor shows on text too */
}

.tab-badge {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 20px;
  height: 18px;
  padding: 0 6px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 10px;
  font-size: 11px;
  font-weight: 600;
  color: var(--text-muted);
  cursor: pointer; /* Ensure cursor shows on badge too */
  transition:
    background var(--duration-fast) ease,
    color var(--duration-fast) ease;
}

.tab.active .tab-badge {
  background: var(--accent-dim);
  color: var(--accent);
}

/* Slide Counter */
.slide-counter {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 2px;
  padding: 0 12px;
  font-family: var(--font-ui);
  font-size: 12px;
  font-weight: 500;
  color: var(--text-secondary);
  letter-spacing: 0.02em;
}

.slide-counter #current-slide {
  min-width: 20px;
  text-align: right;
}

.slide-counter #total-slides {
  min-width: 20px;
  text-align: left;
}

.counter-separator {
  opacity: 0.6;
}

/* Mode Toggle */
.mode-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 10px;
  color: var(--text-muted);
  cursor: pointer;
  transition:
    color var(--duration-fast) ease,
    background var(--duration-fast) ease,
    border-color var(--duration-fast) ease;
}

.mode-toggle:hover {
  color: var(--text-secondary);
  background: rgba(255, 255, 255, 0.03);
  border-color: rgba(255, 255, 255, 0.15);
}

.mode-toggle.active {
  color: var(--accent);
  background: var(--accent-glow);
  border-color: var(--accent-dim);
}

.star-icon {
  width: 18px;
  height: 18px;
}

.mode-toggle.active .star-icon {
  fill: var(--accent);
}

/* ==========================================================================
   Segmented Mode Toggle (All/Personalized)
   ========================================================================== */

.segmented-toggle {
  display: flex;
  align-items: center;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 8px;
  padding: 2px;
  gap: 2px;
}

.segmented-toggle button {
  padding: 6px 12px;
  background: transparent;
  border: none;
  border-radius: 6px;
  color: var(--text-secondary);
  font-family: var(--font-ui);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  cursor: pointer;
  transition:
    color var(--duration-fast) ease,
    background var(--duration-fast) ease;
}

.segmented-toggle button:hover {
  color: var(--text-primary);
}

.segmented-toggle button.active {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.08);
}

/* Help Button */
.help-button {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  margin-left: auto;
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 10px;
  color: var(--text-muted);
  cursor: pointer;
  transition:
    color var(--duration-fast) ease,
    background var(--duration-fast) ease,
    border-color var(--duration-fast) ease;
}

.help-button:hover {
  color: var(--text-secondary);
  background: rgba(255, 255, 255, 0.03);
  border-color: rgba(255, 255, 255, 0.15);
}

.help-button.active {
  color: var(--accent);
  background: var(--accent-glow);
  border-color: var(--accent-dim);
}

.help-button svg {
  width: 18px;
  height: 18px;
}

/* Filter Button */
.filter-button {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 10px;
  color: var(--text-muted);
  cursor: pointer;
  transition:
    color var(--duration-fast) ease,
    background var(--duration-fast) ease,
    border-color var(--duration-fast) ease;
}

.filter-button:hover {
  color: var(--text-secondary);
  background: rgba(255, 255, 255, 0.03);
  border-color: rgba(255, 255, 255, 0.15);
}

.filter-button.active {
  color: var(--accent);
  background: var(--accent-glow);
  border-color: var(--accent-dim);
}

.filter-button svg {
  width: 18px;
  height: 18px;
}

/* Tab bar controls container */
.tab-bar-controls {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* ==========================================================================
   Tag Panel
   ========================================================================== */

#tag-panel {
  position: fixed;
  top: var(--tab-bar-height);
  left: 0;
  right: 0;
  z-index: 899;
  background: var(--bg-overlay);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--section-border);
  padding: 16px 20px;
  max-height: 200px;
  overflow-y: auto;
  transform: translateY(-100%);
  opacity: 0;
  pointer-events: none;
  transition:
    transform var(--duration-normal) var(--ease-out),
    opacity var(--duration-normal) var(--ease-out);
}

#tag-panel.visible {
  transform: translateY(0);
  opacity: 1;
  pointer-events: auto;
}

.tag-panel-content {
  max-width: 1400px;
  margin: 0 auto;
}

.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

/* ==========================================================================
   Tag Chips
   ========================================================================== */

.tag-chip {
  display: inline-flex;
  align-items: center;
  padding: 6px 12px;
  background: var(--chip-bg);
  border: 1px solid var(--chip-border);
  border-radius: var(--chip-radius);
  color: var(--text-secondary);
  font-family: var(--font-ui);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.01em;
  cursor: pointer;
  transition:
    background var(--duration-fast) ease,
    border-color var(--duration-fast) ease,
    color var(--duration-fast) ease,
    box-shadow var(--duration-fast) ease;
}

.tag-chip:hover {
  border-color: rgba(255, 255, 255, 0.17);
  color: var(--text-primary);
}

/* Selected state */
.tag-chip.selected {
  background: var(--chip-bg-selected);
  border-color: var(--chip-border-selected);
  color: var(--text-primary);
}

/* New this week state (dashed border) */
.tag-chip.new {
  border-style: dashed;
  border-color: var(--chip-border-new);
}

.tag-chip.new.selected {
  border-style: dashed;
  border-color: var(--chip-border-new);
}

/* Present in current slide state (shadow/elevation) */
.tag-chip.present {
  box-shadow: var(--chip-shadow-present);
}

/* Combined: selected + new */
.tag-chip.selected.new {
  background: var(--chip-bg-selected);
  border-style: dashed;
  border-color: var(--chip-border-new);
}

/* Combined: selected + present */
.tag-chip.selected.present {
  background: var(--chip-bg-selected);
  border-color: var(--chip-border-selected);
  box-shadow: var(--chip-shadow-present);
}

/* Combined: new + present */
.tag-chip.new.present {
  border-style: dashed;
  border-width: 2px;
  border-color: rgba(229, 161, 88, 0.5);
  box-shadow: var(--chip-shadow-present);
}

/* Combined: selected + new + present */
.tag-chip.selected.new.present {
  background: var(--chip-bg-selected);
  border-style: dashed;
  border-width: 2px;
  border-color: rgba(229, 161, 88, 0.5);
  box-shadow: var(--chip-shadow-present);
}

/* Focus state for accessibility */
.tag-chip:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* ==========================================================================
   Progress Bar
   ========================================================================== */

.progress-bar {
  position: relative;
  height: var(--progress-height);
  background: rgba(255, 255, 255, 0.06);
}

.progress-fill {
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  width: 0%;
  background: var(--accent);
  transition: width var(--duration-normal) var(--ease-out);
}

.progress-sections {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 100%;
  display: flex;
  pointer-events: none;
}

.progress-section {
  position: relative;
  height: 100%;
  border-right: 1px solid var(--section-border);
}

.progress-section:last-child {
  border-right: none;
}

/* ==========================================================================
   Slide Container
   ========================================================================== */

.slide-container {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  overflow: hidden;
  background: var(--bg-primary);
}

.slide-track {
  position: relative;
  width: 100%;
  height: 100%;
}

/* Slide */
.slide {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transform: translateX(100%);
  cursor: default;
  /* Default transition for within-post navigation */
  transition:
    opacity var(--duration-fast) var(--ease-out),
    transform var(--duration-fast) var(--ease-out),
    filter var(--duration-fast) var(--ease-out),
    contrast var(--duration-fast) var(--ease-out);
}

.slide.active {
  opacity: 1;
  visibility: visible;
  transform: translateX(0) translateY(0);
  z-index: 10;
}

.slide.prev {
  opacity: 0;
  visibility: hidden;
  transform: translateX(-100%);
}

.slide.next {
  opacity: 0;
  visibility: hidden;
  transform: translateX(100%);
}

/* ==========================================================================
   Transition Types - Visual Grammar per UI Spec
   ========================================================================== */

/* Within Post: Simple horizontal slide, no visual emphasis */
.slide.transition-within-post {
  transition:
    opacity var(--duration-fast) var(--ease-out),
    transform var(--duration-fast) var(--ease-out);
  /* No brightness or filter changes - keep it "flat" */
}

/* Between Posts: 90% dim with micro-settle + thin edge flash */
.slide.transition-posts {
  transition:
    opacity var(--duration-fast) var(--ease-out),
    transform var(--duration-fast) var(--ease-out),
    filter var(--duration-fast) var(--ease-out);
}

.slide.transition-posts.transitioning-out {
  filter: brightness(0.9);
}

.slide.transition-posts.active {
  filter: brightness(1);
}

/* Micro-settle: Subtle ease-out hold at end of post transition */
.slide.micro-settle {
  transition-timing-function: cubic-bezier(0.22, 1, 0.36, 1);
}

/* ==========================================================================
   Bundle Stack Effect - Posts stack behind current
   ========================================================================== */

/* Stacked post: visible behind current, dimmed + scaled + offset */
.slide.stacked {
  opacity: 1;
  visibility: visible;
  transform: translateX(0) scale(0.94) translateY(8px);
  filter: brightness(0.5);
  z-index: 5;
  transition:
    opacity var(--duration-normal) var(--ease-out),
    transform var(--duration-normal) var(--ease-out),
    filter var(--duration-normal) var(--ease-out);
}

/* Multiple stacked posts get progressively more dimmed/scaled */
.slide.stacked.stack-depth-2 {
  transform: translateX(0) scale(0.90) translateY(14px);
  filter: brightness(0.35);
  z-index: 4;
}

.slide.stacked.stack-depth-3 {
  transform: translateX(0) scale(0.86) translateY(20px);
  filter: brightness(0.25);
  z-index: 3;
}

.slide.stacked.stack-depth-4 {
  transform: translateX(0) scale(0.82) translateY(26px);
  filter: brightness(0.15);
  z-index: 2;
}

/* Un-stacking animation: slide rises up and brightens */
.slide.unstacking {
  transition:
    opacity var(--duration-normal) var(--ease-out),
    transform var(--duration-normal) var(--ease-out),
    filter var(--duration-normal) var(--ease-out);
}

/* Stack fade out: all stacked posts fade together when leaving bundle */
.slide.stack-fade-out {
  opacity: 0;
  filter: brightness(0.3);
  transition:
    opacity var(--duration-normal) var(--ease-out),
    filter var(--duration-normal) var(--ease-out);
}

/* Active slide in stack context has higher z-index */
.slide.active.stack-top {
  z-index: 15;
}

/* Between Groups/Bundles: 80% dim + thick edge glow + micro-zoom */
.slide.transition-groups {
  transition:
    opacity var(--duration-bundle) var(--ease-out),
    transform var(--duration-bundle) var(--ease-out),
    filter var(--duration-bundle) var(--ease-out);
}

.slide.transition-groups.transitioning-out {
  filter: brightness(0.8);
}

.slide.transition-groups.active {
  transform: translateX(0) scale(1);
}

.slide.transition-groups.scale-enter {
  transform: translateX(0) scale(0.98);
  animation: bundleScaleSettle var(--duration-bundle) var(--ease-out) forwards;
}

@keyframes bundleScaleSettle {
  from {
    transform: translateX(0) scale(0.98);
  }
  to {
    transform: translateX(0) scale(1);
  }
}

/* Section via Horizontal: Keep horizontal motion + overlay + scale */
.slide.transition-section-horizontal {
  transition:
    opacity var(--duration-section) var(--ease-in-out),
    transform var(--duration-section) var(--ease-in-out),
    filter var(--duration-section) var(--ease-in-out);
}

.slide.transition-section-horizontal.transitioning-out {
  filter: brightness(0.6);
}

/* Section horizontal with scale entrance */
.slide.transition-section-horizontal.scale-enter {
  transform: translateX(0) scale(0.96);
  animation: sectionScaleSettle var(--duration-section) var(--ease-in-out) forwards;
}

@keyframes sectionScaleSettle {
  from {
    transform: translateX(0) scale(0.96);
  }
  to {
    transform: translateX(0) scale(1);
  }
}

/* Axis hint: Micro-drift to foreshadow section boundary */
.slide.axis-hint-up {
  animation: axisHintUp var(--duration-section) var(--ease-in-out) forwards;
}

.slide.axis-hint-down {
  animation: axisHintDown var(--duration-section) var(--ease-in-out) forwards;
}

@keyframes axisHintUp {
  0% {
    transform: translateX(100%) translateY(0) scale(0.96);
  }
  60% {
    transform: translateX(0) translateY(0) scale(0.96);
  }
  100% {
    transform: translateX(0) translateY(-3px) scale(1);
  }
}

@keyframes axisHintDown {
  0% {
    transform: translateX(-100%) translateY(0) scale(0.96);
  }
  60% {
    transform: translateX(0) translateY(0) scale(0.96);
  }
  100% {
    transform: translateX(0) translateY(3px) scale(1);
  }
}

/* Section transition (vertical) - slowest with ease-in-out + scale + overlay */
.slide.transition-section {
  transition:
    opacity var(--duration-section) var(--ease-in-out),
    transform var(--duration-section) var(--ease-in-out),
    filter var(--duration-section) var(--ease-in-out);
}

.slide.transition-section.transitioning-out {
  filter: brightness(0.6);
}

/* Depth swap: Incoming slide starts scaled down and settles */
.slide.depth-swap {
  animation: depthSwapScale var(--duration-section) var(--ease-in-out) forwards;
}

@keyframes depthSwapScale {
  0% {
    transform: translateY(0) scale(0.96);
    filter: brightness(0.9);
  }
  100% {
    transform: translateY(0) scale(1);
    filter: brightness(1);
  }
}

.slide.section-exit-up {
  transform: translateY(-100%);
  opacity: 0;
}

.slide.section-exit-down {
  transform: translateY(100%);
  opacity: 0;
}

.slide.section-enter-from-top {
  transform: translateY(-100%);
}

.slide.section-enter-from-bottom {
  transform: translateY(100%);
}

/* Backward navigation - slightly different easing */
.slide.direction-backward {
  transition-timing-function: var(--ease-in-out);
}

/* Video background layer - stays visible during image transitions */
.slide.video-background {
  z-index: 5 !important;  /* Force lower z-index even when active */
  opacity: 1;
  visibility: visible;
  transform: translateX(0) !important;  /* Keep centered */
}

.slide.video-background video {
  opacity: 1;
  filter: none;
  transition: opacity 300ms ease, filter 300ms ease;
}

/* Slide Media */
.slide img {
  max-width: 100%;
  max-height: 100%;
  /* scale-down: scales down if needed, but never scales up beyond natural size */
  object-fit: scale-down;
  cursor: pointer;
}

.slide video {
  max-width: 100%;
  max-height: 100%;
  width: 100%;
  height: 100%;
  /* contain: fits entire video in view without losing any part, maintains aspect ratio */
  object-fit: contain;
  cursor: pointer;
}

/* ==========================================================================
   Vertical Asset Stacking (Multiple Assets per Slide)
   ========================================================================== */

.slide-assets-container {
  position: relative;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.slide-asset {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* HTML asset wrappers allow clicks to pass through to images/videos below */
.slide-asset:has(.html-overlay) {
  pointer-events: none;
}

/* HTML overlays fill their container */
.html-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 10;
}

/* Re-enable pointer events for interactive elements within HTML overlays */
.html-overlay a,
.html-overlay button,
.html-overlay input,
.html-overlay select,
.html-overlay textarea {
  pointer-events: auto;
}

/* YouTube Title Overlay */
.youtube-title {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 32px 48px;
  background: linear-gradient(
    to top,
    rgba(10, 10, 10, 0.95) 0%,
    rgba(10, 10, 10, 0.85) 50%,
    rgba(10, 10, 10, 0) 100%
  );
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  z-index: 20;
}

.youtube-title-text {
  font-family: var(--font-display);
  font-size: 28px;
  line-height: 1.3;
  color: var(--text-primary);
  font-weight: 400;
  letter-spacing: -0.01em;
  text-align: left;
  max-width: 800px;
  margin: 0 auto;
}

/* Compact variant for smaller titles */
.youtube-title.compact {
  padding: 24px 40px;
}

.youtube-title.compact .youtube-title-text {
  font-size: 22px;
}

/* Centered variant */
.youtube-title.centered {
  bottom: auto;
  top: 50%;
  transform: translateY(-50%);
  background: linear-gradient(
    to bottom,
    rgba(10, 10, 10, 0) 0%,
    rgba(10, 10, 10, 0.95) 20%,
    rgba(10, 10, 10, 0.95) 80%,
    rgba(10, 10, 10, 0) 100%
  );
}

.youtube-title.centered .youtube-title-text {
  text-align: center;
  font-size: 36px;
}

/* Asset placeholder for loading/error */
.slide-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  color: var(--text-muted);
  font-size: 14px;
}

.slide-placeholder svg {
  width: 48px;
  height: 48px;
  opacity: 0.5;
}

/* Exit Slide Styling */
.exit-slide-content {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100%;
  padding: 40px;
}

.exit-slide-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 24px;
  text-align: center;
}

.exit-qr-code {
  width: 100px;
  height: 100px;
  object-fit: contain;
}

.exit-message {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.exit-label {
  font-size: 16px;
  color: var(--text-primary);
  margin: 0;
}

.exit-label a {
  color: var(--accent);
  text-decoration: none;
  transition: color var(--duration-fast) ease;
}

.exit-label a:hover {
  color: rgba(229, 161, 88, 0.8);
  text-decoration: underline;
}

.exit-tagline {
  font-size: 14px;
  color: var(--text-secondary);
  margin: 0;
}

/* ==========================================================================
   Edge Flash Effects
   ========================================================================== */

.edge-flash {
  position: fixed;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--edge-flash);
  opacity: 0;
  pointer-events: none;
  z-index: 800;
}

.edge-flash.left {
  left: 0;
}

.edge-flash.right {
  right: 0;
}

.edge-flash.flash {
  animation: edgeFlash 200ms ease-out forwards;
}

@keyframes edgeFlash {
  0% {
    opacity: 1;
  }
  100% {
    opacity: 0;
  }
}

/* ==========================================================================
   Section Transition Overlay
   ========================================================================== */

.section-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--bg-primary);
  opacity: 0;
  pointer-events: none;
  z-index: 50;
  transition: opacity var(--duration-section) var(--ease-in-out);
}

.section-overlay.active {
  opacity: 0.4;
}

/* ==========================================================================
   Active Tab Pulse Animation
   ========================================================================== */

.tab.transitioning {
  animation: tabPulse 400ms var(--ease-out);
}

@keyframes tabPulse {
  0% {
    background: rgba(255, 255, 255, 0.08);
  }
  50% {
    background: rgba(255, 255, 255, 0.25);
    color: var(--text-primary);
  }
  100% {
    background: rgba(255, 255, 255, 0.08);
  }
}

/* ==========================================================================
   Directional Sheen Effects (for group transitions)
   ========================================================================== */

.sheen {
  position: fixed;
  top: 0;
  bottom: 0;
  width: 120px;
  pointer-events: none;
  z-index: 799;
  opacity: 0;
}

.sheen.left {
  left: 0;
  background: linear-gradient(90deg, rgba(255, 255, 255, 0.2) 0%, rgba(255, 255, 255, 0.05) 50%, transparent 100%);
}

.sheen.right {
  right: 0;
  background: linear-gradient(-90deg, rgba(255, 255, 255, 0.2) 0%, rgba(255, 255, 255, 0.05) 50%, transparent 100%);
}

.sheen.flash {
  animation: sheenFlash 250ms ease-out forwards;
}

@keyframes sheenFlash {
  0% {
    opacity: 0;
    transform: scaleX(0.3);
  }
  40% {
    opacity: 1;
    transform: scaleX(1);
  }
  100% {
    opacity: 0;
    transform: scaleX(1.3);
  }
}

/* ==========================================================================
   Navigation Arrows
   ========================================================================== */

.nav-arrow {
  position: fixed;
  top: 50%;
  transform: translateY(-50%);
  width: var(--nav-arrow-size);
  height: var(--nav-arrow-size);
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 50%;
  color: var(--text-muted);
  cursor: pointer;
  opacity: 0;
  transition:
    opacity var(--duration-normal) ease,
    color var(--duration-fast) ease,
    background var(--duration-fast) ease;
  z-index: 100;
}

.nav-arrow.prev {
  left: 20px;
}

.nav-arrow.next {
  right: 20px;
}

.nav-arrow svg {
  width: 24px;
  height: 24px;
}

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

/* Show arrows on hover/touch */
.slide-container:hover ~ .nav-arrow,
.nav-arrow:hover {
  opacity: 1;
}

/* Hide arrows on mobile by default */
@media (max-width: 768px) {
  .nav-arrow {
    display: none;
  }
}

/* ==========================================================================
   Onboarding
   ========================================================================== */

.onboarding {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(10, 10, 10, 0.7);
  z-index: 2000;
  animation: fadeIn 300ms ease-out;
}

.onboarding.hidden {
  display: none;
}

.onboarding.fading-out {
  animation: fadeOut 500ms ease-out forwards;
}

.onboarding-hints {
  text-align: center;
}

.hint {
  font-size: 18px;
  font-weight: 400;
  color: var(--text-secondary);
  margin-bottom: 16px;
  opacity: 0;
  transform: translateY(10px);
  animation: hintReveal 400ms var(--ease-out) forwards;
}

.hint:nth-child(1) { animation-delay: 200ms; }
.hint:nth-child(2) { animation-delay: 400ms; }
.hint:nth-child(3) { animation-delay: 600ms; }

.hint .arrow {
  display: inline-block;
  color: var(--accent);
  font-weight: 600;
}

@keyframes hintReveal {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes fadeOut {
  from { opacity: 1; }
  to { opacity: 0; }
}

/* ==========================================================================
   Error State
   ========================================================================== */

.error-state {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-primary);
  z-index: 1500;
}

.error-state.hidden {
  display: none;
}

.error-content {
  text-align: center;
  padding: 40px;
}

.error-title {
  font-family: var(--font-display);
  font-size: 24px;
  font-style: italic;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.error-message {
  font-size: 14px;
  color: var(--text-muted);
}

/* ==========================================================================
   Loading State
   ========================================================================== */

.loading-state {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-primary);
  z-index: 1500;
}

.loading-state.hidden {
  display: none;
}

.loader {
  width: 40px;
  height: 40px;
  border: 2px solid rgba(255, 255, 255, 0.1);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 800ms linear infinite;
}

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

/* ==========================================================================
   Responsive Adjustments
   ========================================================================== */

@media (max-width: 768px) {
  :root {
    --tab-bar-height: 48px;
    --nav-arrow-size: 40px;
  }

  .tab-bar-content {
    padding: 0 12px;
  }

  .tabs {
    gap: 2px;
  }

  .tab {
    padding: 6px 10px;
    font-size: 11px;
  }

  /* Tag panel responsive */
  #tag-panel {
    padding: 12px 16px;
    max-height: 180px;
  }

  .tag-chip {
    padding: 5px 10px;
    font-size: 11px;
  }

  .tag-cloud {
    gap: 6px;
  }

  /* Segmented toggle responsive */
  .segmented-toggle button {
    padding: 5px 10px;
    font-size: 10px;
  }

  .filter-button {
    width: 36px;
    height: 36px;
  }

  .filter-button svg {
    width: 16px;
    height: 16px;
  }

  .tab-bar-controls {
    gap: 8px;
  }

  .tab-name {
    letter-spacing: 0.03em;
  }

  .tab-badge {
    min-width: 18px;
    height: 16px;
    font-size: 10px;
  }

  .mode-toggle {
    width: 36px;
    height: 36px;
  }

  .star-icon {
    width: 16px;
    height: 16px;
  }

  .hint {
    font-size: 16px;
  }
}

@media (max-width: 480px) {
  .tab-name {
    display: none;
  }

  .tab {
    padding: 6px 8px;
  }

  .tab-badge {
    min-width: 24px;
    height: 20px;
    font-size: 11px;
  }
}

/* ==========================================================================
   Reduced Motion
   ========================================================================== */

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* ==========================================================================
   Focus States (Accessibility)
   ========================================================================== */

/* Focus styles - only show for nav arrows (keyboard navigation) */
.nav-arrow:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* Tabs: Remove all focus outlines since keyboard nav uses arrow keys */
.tab:active,
.tab:focus,
.tab:focus-visible {
  outline: none;
}

/* Mode toggle: Remove focus outline (clicked with mouse, not keyboard nav) */
.mode-toggle:active,
.mode-toggle:focus,
.mode-toggle:focus-visible {
  outline: none;
}

/* ==========================================================================
   Print Styles
   ========================================================================== */

@media print {
  #tab-bar,
  .nav-arrow,
  .onboarding,
  .loading-state,
  .nav-arrow {
    display: none !important;
  }

  .slide-container {
    position: static;
  }

  .slide {
    position: static;
    page-break-after: always;
  }
}