/* ==========================================================================
   WIKIVOX — MODERN DESIGN SYSTEM & STYLES
   Inspired by antigravity.google aesthetic:
   Cinematic obsidian depth, luminous accents, large typography, fluid glassmorphism
   ========================================================================== */

/* --- Custom Properties & Design Tokens --- */
:root {
  /* Color Palette - Deep Obsidian Canvas */
  --bg-black: #05070b;
  --bg-surface: #0a0e17;
  --bg-surface-elevated: #111726;
  --bg-surface-card: rgba(18, 24, 38, 0.65);
  --bg-surface-glass: rgba(14, 20, 32, 0.72);
  --bg-surface-glass-border: rgba(255, 255, 255, 0.09);
  --bg-surface-glass-hover: rgba(25, 34, 52, 0.85);

  /* Typography Colors */
  --text-primary: #f5f7fa;
  --text-secondary: #a0aec0;
  --text-muted: #64748b;
  --text-inverse: #05070b;

  /* Edition Accent Tones */
  --color-definitive: #00E5FF;
  --color-definitive-glow: rgba(0, 229, 255, 0.35);
  --color-ideas: #00E676;
  --color-ideas-glow: rgba(0, 230, 118, 0.35);
  --color-discovery: #D500F9;
  --color-discovery-glow: rgba(213, 0, 249, 0.35);
  --color-story: #FFAB00;
  --color-story-glow: rgba(255, 171, 0, 0.35);
  --color-sleep: #3D5AFE;
  --color-sleep-glow: rgba(61, 90, 254, 0.35);

  /* Primary Brand Accents */
  --brand-primary: #38bdf8;
  --brand-primary-glow: rgba(56, 189, 248, 0.3);
  --brand-accent: #818cf8;
  --brand-gradient: linear-gradient(135deg, #38bdf8 0%, #818cf8 50%, #c084fc 100%);
  --brand-gradient-hover: linear-gradient(135deg, #60a5fa 0%, #a855f7 100%);

  /* Border & Glow Tokens */
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(255, 255, 255, 0.2);
  --glow-subtle: 0 0 30px rgba(56, 189, 248, 0.15);
  --glow-strong: 0 0 60px rgba(56, 189, 248, 0.28);

  /* Modern Crisp Typography (Figtree + JetBrains Mono) */
  --font-sans: 'Figtree', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-display: 'Figtree', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', SFMono-Regular, Menlo, Monaco, Consolas, monospace;

  /* Layout & Spacing */
  --max-width-site: 1240px;
  --max-width-narrow: 840px;
  --header-height: 76px;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --radius-full: 9999px;

  /* Animation Timings */
  --ease-out-cubic: cubic-bezier(0.215, 0.61, 0.355, 1);
  --ease-in-out-cubic: cubic-bezier(0.645, 0.045, 0.355, 1);
  --duration-fast: 200ms;
  --duration-normal: 350ms;
  --duration-slow: 600ms;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 100px;
  color-scheme: dark;
  background-color: var(--bg-black);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-black);
  color: var(--text-primary);
  font-size: 1.05rem;
  line-height: 1.65;
  overflow-x: hidden;
  position: relative;
  min-height: 100vh;
}

/* Background Ambient Lighting */
.ambient-glow-layer {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

/* Background WebGL GPU Particle Universe */
.webgl-canvas-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
}

.webgl-canvas-container canvas {
  width: 100% !important;
  height: 100% !important;
  display: block;
}

.ambient-glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(120px);
  opacity: 0.18;
  mix-blend-mode: screen;
  will-change: transform;
}

.ambient-glow-1 {
  top: -15vh;
  left: 20vw;
  width: 60vw;
  height: 60vh;
  background: radial-gradient(circle, #38bdf8 0%, #3b82f6 40%, transparent 70%);
}

.ambient-glow-2 {
  top: 40vh;
  right: -10vw;
  width: 50vw;
  height: 50vh;
  background: radial-gradient(circle, #8b5cf6 0%, #6366f1 40%, transparent 70%);
  opacity: 0.12;
}

.ambient-glow-3 {
  top: 80vh;
  left: -10vw;
  width: 50vw;
  height: 50vh;
  background: radial-gradient(circle, #10b981 0%, #06b6d4 40%, transparent 70%);
  opacity: 0.10;
}

/* Base Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 700;
  color: #ffffff;
  line-height: 1.15;
  letter-spacing: -0.025em;
  text-wrap: balance;
}

h1 {
  font-size: clamp(2.8rem, 6.5vw, 5.2rem);
  font-weight: 800;
  letter-spacing: -0.035em;
}

h2 {
  font-size: clamp(2.1rem, 4.2vw, 3.4rem);
  font-weight: 750;
  letter-spacing: -0.03em;
}

h3 {
  font-size: clamp(1.4rem, 2.4vw, 1.85rem);
  font-weight: 650;
  letter-spacing: -0.02em;
}

h4 {
  font-size: 1.2rem;
  font-weight: 600;
}

p {
  color: var(--text-secondary);
  font-size: clamp(1.02rem, 1.3vw, 1.18rem);
  font-weight: 400;
  line-height: 1.7;
}

a {
  color: var(--brand-primary);
  text-decoration: none;
  transition: color var(--duration-fast) ease;
}

a:hover {
  color: #ffffff;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

/* Section Container & Wrappers */
.site-container {
  width: 100%;
  max-width: var(--max-width-site);
  margin: 0 auto;
  padding: 0 clamp(1.25rem, 3.5vw, 2.5rem);
  position: relative;
  z-index: 1;
}

.section-padding {
  padding: clamp(3.5rem, 6vw, 6rem) 0;
}

.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto clamp(2rem, 4vw, 3.5rem) auto;
}

.section-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.9rem;
  border-radius: var(--radius-full);
  background: rgba(56, 189, 248, 0.08);
  border: 1px solid rgba(56, 189, 248, 0.22);
  color: var(--brand-primary);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  white-space: nowrap;
  margin-bottom: 1.25rem;
}

.section-eyebrow svg {
  width: 24px;
  height: 24px;
  fill: currentColor;
}

.section-title {
  margin-bottom: 1.25rem;
}

.section-subtitle {
  color: var(--text-secondary);
  font-size: clamp(1.05rem, 1.4vw, 1.25rem);
  line-height: 1.65;
}

/* ==========================================================================
   NAVIGATION BAR (Glassmorphic Floating Pill)
   ========================================================================== */
.site-header {
  position: fixed;
  top: 1.25rem;
  left: 0;
  width: 100%;
  z-index: 100;
  pointer-events: none;
  transition: transform var(--duration-normal) var(--ease-out-cubic);
}

.nav-container {
  width: min(94%, 1060px);
  margin: 0 auto;
  pointer-events: auto;
}

.nav-pill {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.6rem 0.9rem 0.6rem 1.4rem;
  background: var(--bg-surface-glass);
  backdrop-filter: blur(24px) saturate(180%);
  -webkit-backdrop-filter: blur(24px) saturate(180%);
  border: 1px solid var(--bg-surface-glass-border);
  border-radius: var(--radius-full);
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.45), 0 0 1px rgba(255, 255, 255, 0.1) inset;
  transition: border-color var(--duration-fast) ease, background var(--duration-fast) ease;
}

.nav-pill:hover {
  border-color: rgba(255, 255, 255, 0.16);
}

.brand-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: #ffffff;
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
  transition: opacity var(--duration-fast) ease;
}

.brand-link:hover {
  opacity: 0.9;
}

.brand-logo-icon {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
}

.brand-logo-icon svg {
  width: 100%;
  height: 100%;
}

.brand-wordmark {
  font-weight: 750;
  letter-spacing: -0.03em;
  color: #ffffff;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 1.75rem;
  list-style: none;
}

.nav-item-link {
  color: var(--text-secondary);
  font-size: 0.92rem;
  font-weight: 500;
  letter-spacing: -0.01em;
  padding: 0.4rem 0.2rem;
  position: relative;
  transition: color var(--duration-fast) ease;
}

.nav-item-link:hover, .nav-item-link.active {
  color: #ffffff;
}

.nav-item-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%) scaleX(0);
  width: 16px;
  height: 2px;
  background: var(--brand-primary);
  border-radius: 2px;
  transition: transform var(--duration-fast) ease;
}

.nav-item-link:hover::after, .nav-item-link.active::after {
  transform: translateX(-50%) scaleX(1);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

/* Primary and Secondary Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  padding: 0.75rem 1.6rem;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  transition: all var(--duration-normal) var(--ease-out-cubic);
  position: relative;
  white-space: nowrap;
  letter-spacing: -0.01em;
}

.btn-primary {
  background: #ffffff;
  color: var(--bg-black);
  box-shadow: 0 0 20px rgba(255, 255, 255, 0.2);
}

.btn-primary:hover {
  background: #f0f4f8;
  color: var(--bg-black);
  transform: translateY(-1px);
  box-shadow: 0 0 30px rgba(255, 255, 255, 0.35);
}

.btn-pill-small {
  padding: 0.48rem 1.15rem;
  font-size: 0.88rem;
  font-weight: 600;
}

.btn-glass {
  background: rgba(255, 255, 255, 0.07);
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.12);
  backdrop-filter: blur(12px);
}

.btn-glass:hover {
  background: rgba(255, 255, 255, 0.14);
  border-color: rgba(255, 255, 255, 0.25);
  color: #ffffff;
  transform: translateY(-1px);
}

.btn-gradient {
  background: var(--brand-gradient);
  color: #ffffff;
  box-shadow: 0 4px 24px rgba(56, 189, 248, 0.3);
}

.btn-gradient:hover {
  background: var(--brand-gradient-hover);
  color: #ffffff;
  box-shadow: 0 6px 32px rgba(129, 140, 248, 0.45);
  transform: translateY(-2px);
}

/* Mobile Nav Toggle */
.mobile-nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: #ffffff;
  gap: 5px;
}

.mobile-nav-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  background: #ffffff;
  border-radius: 2px;
  transition: transform var(--duration-fast) ease, opacity var(--duration-fast) ease;
}

.mobile-nav-toggle.open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.mobile-nav-toggle.open span:nth-child(2) {
  opacity: 0;
}

.mobile-nav-toggle.open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile Drawer Overlay */
.mobile-nav-drawer {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(5, 7, 11, 0.94);
  backdrop-filter: blur(28px);
  z-index: 99;
  padding: 6rem 2rem 3rem 2rem;
  flex-direction: column;
  justify-content: space-between;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--duration-normal) ease;
}

.mobile-nav-drawer.open {
  display: flex;
  opacity: 1;
  pointer-events: auto;
}

.mobile-menu-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.mobile-menu-links a {
  font-size: 1.25rem;
  font-weight: 600;
  color: #ffffff;
  display: block;
}

/* ==========================================================================
   HERO SECTION (Cinematic Particle Engine + Living Orb)
   ========================================================================== */
.hero-section {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding-top: calc(var(--header-height) + 3rem);
  padding-bottom: 5rem;
  overflow: hidden;
}

.hero-canvas-container {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
  pointer-events: auto;
}

#hero-canvas {
  width: 100%;
  height: 100%;
  display: block;
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 900px;
  margin: 0 auto;
  pointer-events: none;
}

.hero-content * {
  pointer-events: auto;
}

.hero-badge-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.45rem 1.1rem;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.14);
  backdrop-filter: blur(16px);
  color: #ffffff;
  font-size: 0.9rem;
  font-weight: 500;
  margin-bottom: 2rem;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}

.hero-badge-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--brand-primary);
  box-shadow: 0 0 12px var(--brand-primary);
  animation: pulseOrb 2.5s infinite ease-in-out;
}

@keyframes pulseOrb {
  0%, 100% { transform: scale(1); opacity: 0.8; }
  50% { transform: scale(1.35); opacity: 1; box-shadow: 0 0 18px var(--brand-primary); }
}

.hero-headline {
  margin-bottom: 1.5rem;
  letter-spacing: -0.04em;
  text-shadow: 0 4px 30px rgba(0, 0, 0, 0.9), 0 0 50px rgba(0, 0, 0, 0.7);
}

.hero-headline-highlight {
  color: #F5A623;
}

.hero-description {
  max-width: 740px;
  margin: 0 auto 2.5rem auto;
  font-size: clamp(1.1rem, 1.6vw, 1.35rem);
  line-height: 1.65;
  color: #d1d5db;
  text-shadow: 0 2px 16px rgba(0, 0, 0, 0.95);
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.25rem;
  flex-wrap: wrap;
  margin-bottom: 3.5rem;
}

.hero-cta-group .btn {
  padding: 0.95rem 2.2rem;
  font-size: 1.05rem;
}

/* Audio Status Pill */
.hero-sound-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.4rem 0.9rem;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: var(--text-secondary);
  font-size: 0.85rem;
  font-weight: 500;
  transition: all var(--duration-fast) ease;
}

.hero-sound-toggle:hover {
  background: rgba(255, 255, 255, 0.1);
  color: #ffffff;
}

.sound-bars-anim {
  display: flex;
  align-items: flex-end;
  gap: 2.5px;
  height: 12px;
}

.sound-bars-anim span {
  width: 2.5px;
  background: var(--brand-primary);
  border-radius: 1px;
  animation: waveBar 1.2s ease-in-out infinite alternate;
}

.sound-bars-anim span:nth-child(1) { height: 40%; animation-delay: 0.1s; }
.sound-bars-anim span:nth-child(2) { height: 100%; animation-delay: 0.3s; }
.sound-bars-anim span:nth-child(3) { height: 60%; animation-delay: 0.2s; }
.sound-bars-anim span:nth-child(4) { height: 80%; animation-delay: 0.4s; }

.sound-bars-anim.paused span {
  animation-play-state: paused;
  height: 30% !important;
}

@keyframes waveBar {
  0% { height: 25%; }
  100% { height: 100%; }
}

/* Hero Platform Badges */
.hero-platforms-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.75rem;
  color: var(--text-muted);
  font-size: 0.88rem;
  font-weight: 500;
  letter-spacing: -0.01em;
}

.hero-platforms-bar span {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.hero-platforms-bar svg,
.hero-platforms-bar img.platform-icon {
  width: auto;
  height: 16px;
  fill: currentColor;
}

/* ==========================================================================
   KNOWLEDGE CONSTELLATIONS (Subjects Section #subjects)
   ========================================================================== */
.subjects-section {
  position: relative;
  overflow: hidden;
}

.subjects-constellation-canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
  pointer-events: none;
  opacity: 0.45;
}

/* Topic Filter Category Pills */
.topic-categories-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  flex-wrap: wrap;
  margin-bottom: 3.5rem;
  position: relative;
  z-index: 2;
}

.topic-filter-btn {
  padding: 0.55rem 1.25rem;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.09);
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 550;
  transition: all var(--duration-fast) ease;
}

.topic-filter-btn:hover {
  background: rgba(255, 255, 255, 0.1);
  color: #ffffff;
  border-color: rgba(255, 255, 255, 0.18);
}

.topic-filter-btn.active {
  background: #ffffff;
  color: var(--bg-black);
  border-color: #ffffff;
  box-shadow: 0 4px 18px rgba(255, 255, 255, 0.2);
}

/* Subject Showcase Cards Grid */
.subjects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 1.75rem;
  position: relative;
  z-index: 2;
}

.subject-card {
  background: var(--bg-surface-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  backdrop-filter: blur(16px);
  transition: transform var(--duration-normal) var(--ease-out-cubic),
              border-color var(--duration-normal) ease,
              box-shadow var(--duration-normal) ease;
  position: relative;
}

.subject-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-hover);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.5), 0 0 30px rgba(56, 189, 248, 0.1);
}

.subject-card-media {
  position: relative;
  width: 100%;
  aspect-ratio: 1 / 1;
  height: auto;
  overflow: hidden;
  background: #0d1320;
}

.subject-card-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s var(--ease-out-cubic);
}

.subject-card:hover .subject-card-img {
  transform: scale(1.05);
}

.subject-card-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(180deg, transparent 40%, rgba(10, 14, 23, 0.95) 100%);
}

.subject-category-tag {
  position: absolute;
  bottom: 1rem;
  left: 50%;
  transform: translateX(-50%);
  padding: 0.3rem 0.75rem;
  border-radius: var(--radius-full);
  background: rgba(10, 14, 23, 0.8);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.12);
  color: #ffffff;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  white-space: nowrap;
}

.subject-duration-pill {
  position: absolute;
  bottom: 0.85rem;
  right: 1rem;
  display: flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-full);
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(8px);
  color: #e2e8f0;
  font-size: 0.78rem;
  font-weight: 550;
}

.subject-duration-pill svg {
  width: 12px;
  height: 12px;
  fill: currentColor;
}

.subject-card-body {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.subject-card-title {
  margin-bottom: 0.6rem;
  font-size: 1.35rem;
  line-height: 1.3;
}

.subject-card-desc {
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  flex-grow: 1;
}

.subject-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding-top: 1rem;
}

.subject-editions-badge {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.82rem;
  color: var(--brand-primary);
  font-weight: 600;
}

.subject-listen-action {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: #ffffff;
  font-size: 0.85rem;
  font-weight: 600;
  padding: 0.4rem 0.85rem;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid rgba(255, 255, 255, 0.1);
  transition: all var(--duration-fast) ease;
}

.subject-listen-action:hover {
  background: rgba(255, 255, 255, 0.15);
  border-color: rgba(255, 255, 255, 0.25);
  transform: translateX(2px);
}

.subject-listen-action svg {
  width: 12px;
  height: 12px;
  fill: currentColor;
}

/* ==========================================================================
   EDITIONS SECTION (#editions: "One subject. Five ways in.")
   ========================================================================== */
.editions-section {
  position: relative;
  overflow: hidden;
}

.editions-canvas-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 1;
}

.editions-wrapper {
  position: relative;
  z-index: 2;
}

/* Edition Selector Tab Pills */
.editions-tab-list {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-bottom: 3.5rem;
}

.edition-tab-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  padding: 0.75rem 1.4rem;
  border-radius: var(--radius-full);
  background: var(--bg-surface-glass);
  border: 1px solid var(--bg-surface-glass-border);
  color: var(--text-secondary);
  font-size: 0.96rem;
  font-weight: 600;
  backdrop-filter: blur(16px);
  transition: all var(--duration-normal) var(--ease-out-cubic);
}

.edition-tab-icon {
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.edition-tab-icon svg {
  width: 100%;
  height: 100%;
  fill: currentColor;
}

.edition-tab-btn:hover {
  background: var(--bg-surface-glass-hover);
  color: #ffffff;
  border-color: rgba(255, 255, 255, 0.2);
  transform: translateY(-2px);
}

/* Edition Active Tab Highlights */
.edition-tab-btn[data-edition="definitive"].active {
  background: rgba(0, 229, 255, 0.12);
  border-color: var(--color-definitive);
  color: #ffffff;
  box-shadow: 0 0 25px var(--color-definitive-glow);
}

.edition-tab-btn[data-edition="ideas"].active {
  background: rgba(0, 230, 118, 0.12);
  border-color: var(--color-ideas);
  color: #ffffff;
  box-shadow: 0 0 25px var(--color-ideas-glow);
}

.edition-tab-btn[data-edition="discovery"].active {
  background: rgba(213, 0, 249, 0.12);
  border-color: var(--color-discovery);
  color: #ffffff;
  box-shadow: 0 0 25px var(--color-discovery-glow);
}

.edition-tab-btn[data-edition="story"].active {
  background: rgba(255, 171, 0, 0.12);
  border-color: var(--color-story);
  color: #ffffff;
  box-shadow: 0 0 25px var(--color-story-glow);
}

.edition-tab-btn[data-edition="sleep"].active {
  background: rgba(61, 90, 254, 0.12);
  border-color: var(--color-sleep);
  color: #ffffff;
  box-shadow: 0 0 25px var(--color-sleep-glow);
}

/* Interactive Edition Stage (Dual Column) */
.edition-showcase-stage {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: clamp(2rem, 5vw, 4.5rem);
  align-items: flex-start;
  background: var(--bg-surface-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: clamp(2rem, 4.5vw, 3.5rem);
  backdrop-filter: blur(20px);
  position: relative;
  box-shadow: 0 30px 60px rgba(0, 0, 0, 0.6);
}

/* Left: Interactive Orb & Narration Details */
.edition-details-pane {
  display: flex;
  flex-direction: column;
}

.edition-topic-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  white-space: nowrap;
  letter-spacing: 0.05em;
  color: var(--brand-primary);
  margin-bottom: 0.75rem;
}

.edition-title-name {
  font-size: clamp(2rem, 3.8vw, 2.8rem);
  font-weight: 800;
  margin-bottom: 0.5rem;
  letter-spacing: -0.03em;
}

.edition-tagline {
  font-size: 1.25rem;
  font-weight: 500;
  color: #ffffff;
  margin-bottom: 1.5rem;
  line-height: 1.4;
}

.edition-narration-box {
  background: rgba(10, 14, 23, 0.7);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-md);
  padding: 1.4rem 1.6rem;
  margin-bottom: 1.75rem;
  position: relative;
}

.edition-narration-quote {
  font-size: 1.05rem;
  font-style: italic;
  color: #e2e8f0;
  line-height: 1.65;
  position: relative;
}

.edition-meta-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-bottom: 2rem;
}

.edition-meta-item {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-sm);
  padding: 0.85rem;
}

.edition-meta-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  white-space: nowrap;
  letter-spacing: 0.04em;
  margin-bottom: 0.25rem;
}

.edition-meta-val {
  font-size: 0.95rem;
  font-weight: 600;
  color: #ffffff;
}

/* Live Dynamic Orb Canvas in Stage */
.edition-orb-viewport {
  position: relative;
  width: 100%;
  height: 380px;
  display: flex;
  align-items: center;
  justify-content: center;
}

#edition-orb-canvas {
  width: 100%;
  height: 100%;
  display: block;
}

.edition-orb-overlay-badge {
  position: absolute;
  bottom: 1rem;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 0.9rem;
  border-radius: var(--radius-full);
  background: rgba(10, 14, 23, 0.85);
  border: 1px solid rgba(255, 255, 255, 0.12);
  color: var(--text-secondary);
  font-size: 0.8rem;
  font-weight: 500;
  backdrop-filter: blur(12px);
}

/* Right: Real App Device Screen */
.edition-device-showcase {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.device-frame-mockup {
  position: relative;
  width: 100%;
  max-width: 320px;
  border-radius: 42px;
  padding: 10px;
  background: linear-gradient(145deg, #2a3447, #121722);
  box-shadow: 0 25px 60px rgba(0, 0, 0, 0.7), 0 0 0 1px rgba(255, 255, 255, 0.1) inset;
}

.device-screen-wrapper {
  border-radius: 34px;
  overflow: hidden;
  background: #000000;
  aspect-ratio: 9 / 19.5;
  position: relative;
}

.device-screen-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ==========================================================================
   LISTENING MOMENTS SECTION (#moments)
   ========================================================================== */
.moments-section {
  position: relative;
}

.moments-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
}

.moment-card {
  background: var(--bg-surface-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: clamp(2rem, 3.5vw, 2.75rem);
  backdrop-filter: blur(16px);
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: transform var(--duration-normal) var(--ease-out-cubic),
              border-color var(--duration-normal) ease;
}

.moment-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-hover);
}

.moment-glow-accent {
  position: absolute;
  top: 0;
  right: 0;
  width: 180px;
  height: 180px;
  border-radius: 50%;
  filter: blur(60px);
  opacity: 0.15;
  pointer-events: none;
}

.moment-card:nth-child(1) .moment-glow-accent { background: var(--color-ideas); }
.moment-card:nth-child(2) .moment-glow-accent { background: var(--color-discovery); }
.moment-card:nth-child(3) .moment-glow-accent { background: var(--color-story); }
.moment-card:nth-child(4) .moment-glow-accent { background: var(--color-sleep); }

.moment-icon-header {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: #ffffff;
  margin-bottom: 1.5rem;
}

.moment-icon-header svg {
  width: 24px;
  height: 24px;
  fill: none;
  stroke: currentColor;
}

.moment-title {
  font-size: 1.5rem;
  margin-bottom: 0.75rem;
}

.moment-desc {
  font-size: 1.02rem;
  line-height: 1.65;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
}

.moment-quote-tag {
  font-size: 0.88rem;
  font-style: italic;
  color: var(--brand-primary);
  border-left: 2px solid var(--brand-primary);
  padding-left: 0.75rem;
}

/* ==========================================================================
   APP EXPERIENCE & AUDIO PLAYER SECTION (#experience)
   ========================================================================== */
.experience-section {
  position: relative;
}

.player-showcase-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(2.5rem, 5vw, 5rem);
  align-items: center;
  margin-bottom: 5rem;
}

/* Interactive Web Audio Synthesizer & Waveform */
.interactive-player-deck {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: clamp(2rem, 3.5vw, 3rem);
  box-shadow: 0 30px 60px rgba(0, 0, 0, 0.7);
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}

.player-track-info {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  margin-bottom: 2rem;
}

.player-artwork-thumb {
  width: 64px;
  height: 64px;
  border-radius: 12px;
  overflow: hidden;
  background: #1e293b;
  flex-shrink: 0;
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.4);
}

.player-artwork-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.player-track-meta h4 {
  font-size: 1.2rem;
  margin-bottom: 0.2rem;
}

.player-track-meta p {
  font-size: 0.88rem;
  color: var(--brand-primary);
  font-weight: 550;
}

/* Live Waveform Canvas */
.waveform-canvas-box {
  width: 100%;
  height: 70px;
  margin-bottom: 1.75rem;
  background: rgba(0, 0, 0, 0.35);
  border-radius: var(--radius-md);
  padding: 8px;
}

#waveform-canvas {
  width: 100%;
  height: 100%;
  display: block;
}

/* Player Scrub Bar */
.player-scrubber-row {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 2rem;
}

.scrubber-track {
  flex-grow: 1;
  height: 6px;
  background: rgba(255, 255, 255, 0.12);
  border-radius: 3px;
  position: relative;
  cursor: pointer;
}

.scrubber-fill {
  position: absolute;
  top: 0;
  left: 0;
  width: 0%;
  height: 100%;
  background: var(--brand-gradient);
  border-radius: 3px;
  transition: width 0.1s linear;
}

.scrubber-handle {
  position: absolute;
  top: 50%;
  left: 0%;
  transform: translate(-50%, -50%);
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: #ffffff;
  box-shadow: 0 0 10px rgba(56, 189, 248, 0.8);
}

.scrubber-time {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 500;
}

/* Main Transport Controls */
.player-controls-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.speed-selector-group {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-full);
  padding: 0.25rem 0.4rem;
}

.speed-btn {
  padding: 0.25rem 0.6rem;
  font-size: 0.78rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  color: var(--text-secondary);
  transition: all var(--duration-fast) ease;
}

.speed-btn.active {
  background: rgba(255, 255, 255, 0.16);
  color: #ffffff;
}

.transport-center {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.skip-btn {
  color: var(--text-secondary);
  transition: color var(--duration-fast) ease;
}

.skip-btn:hover {
  color: #ffffff;
}

.skip-btn svg {
  width: 22px;
  height: 22px;
  fill: currentColor;
}

.play-pause-main-btn {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: #ffffff;
  color: var(--bg-black);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 25px rgba(255, 255, 255, 0.25);
  transition: all var(--duration-fast) ease;
}

.play-pause-main-btn:hover {
  transform: scale(1.06);
  box-shadow: 0 0 35px rgba(255, 255, 255, 0.4);
}

.play-pause-main-btn svg {
  width: 22px;
  height: 22px;
  fill: currentColor;
}

/* Feature Highlights Grid */
.experience-features-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

.exp-feature-card {
  background: var(--bg-surface-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.75rem 1.5rem;
  backdrop-filter: blur(16px);
}

.exp-feature-icon {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: rgba(56, 189, 248, 0.1);
  border: 1px solid rgba(56, 189, 248, 0.2);
  color: var(--brand-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.25rem;
}

.exp-feature-icon svg {
  width: 20px;
  height: 20px;
  fill: none;
  stroke: currentColor;
}

.exp-feature-title {
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
}

.exp-feature-desc {
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--text-secondary);
}

/* ==========================================================================
   FINAL CTA MOMENT & CONVERGING ORB (#download)
   ========================================================================== */
.final-cta-section {
  position: relative;
  text-align: center;
  overflow: hidden;
  padding: clamp(6rem, 12vw, 11rem) 0;
}

.final-canvas-container {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 1;
}

#final-canvas {
  width: 100%;
  height: 100%;
  display: block;
}

.final-cta-content {
  position: relative;
  z-index: 2;
  max-width: 820px;
  margin: 0 auto;
}

.final-cta-headline {
  margin-bottom: 1.5rem;
}

.final-cta-subtitle {
  font-size: clamp(1.1rem, 1.5vw, 1.3rem);
  color: var(--text-secondary);
  margin-bottom: 3rem;
}

/* Store Download Buttons Group */
.store-buttons-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.25rem;
  flex-wrap: wrap;
  margin-bottom: 2.5rem;
}

.store-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.9rem;
  padding: 0.85rem 1.75rem;
  border-radius: var(--radius-md);
  background: #0d121c;
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: #ffffff;
  transition: all var(--duration-fast) ease;
}

.store-btn:hover {
  background: #161e2e;
  border-color: rgba(255, 255, 255, 0.35);
  transform: translateY(-2px);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.5);
  color: #ffffff;
}

.store-btn svg {
  width: 28px;
  height: 28px;
  fill: currentColor;
  flex-shrink: 0;
}

.store-btn-text {
  text-align: left;
  line-height: 1.2;
}

.store-btn-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  white-space: nowrap;
  letter-spacing: 0.04em;
}

.store-btn-name {
  font-size: 1.15rem;
  font-weight: 700;
  color: #ffffff;
}

.final-availability-note {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.88rem;
  color: var(--text-muted);
}

.final-availability-note svg {
  width: 14px;
  height: 14px;
  fill: currentColor;
}

/* ==========================================================================
   CONTACT SECTION (#contact)
   ========================================================================== */
.contact-section {
  position: relative;
  border-top: 1px solid var(--border-subtle);
}

.contact-layout-grid {
  display: grid;
  grid-template-columns: 1fr 1.25fr;
  gap: clamp(2.5rem, 5vw, 5rem);
}

.contact-info-column {
  display: flex;
  flex-direction: column;
}

.contact-email-card {
  background: var(--bg-surface-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 2rem;
  margin-top: 2rem;
  margin-bottom: 2rem;
  backdrop-filter: blur(16px);
}

.contact-email-link {
  font-size: 1.35rem;
  font-weight: 700;
  color: #ffffff;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 0.5rem;
}

.contact-email-link:hover {
  color: var(--brand-primary);
}

.faq-mini-list {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.faq-mini-item h5 {
  font-size: 1.05rem;
  margin-bottom: 0.35rem;
  color: #ffffff;
}

.faq-mini-item p {
  font-size: 0.9rem;
  line-height: 1.6;
}

/* Contact Form */
.contact-form-card {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: clamp(2rem, 4vw, 3rem);
  box-shadow: 0 25px 50px rgba(0, 0, 0, 0.5);
}

.form-group-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
  margin-bottom: 1.25rem;
}

.form-group {
  margin-bottom: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.form-group label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.form-input, .form-select, .form-textarea {
  width: 100%;
  padding: 0.85rem 1.1rem;
  background: rgba(10, 14, 23, 0.7);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-md);
  color: #ffffff;
  font-family: inherit;
  font-size: 0.95rem;
  transition: all var(--duration-fast) ease;
}

.form-input:focus, .form-select:focus, .form-textarea:focus {
  outline: none;
  border-color: var(--brand-primary);
  box-shadow: 0 0 15px rgba(56, 189, 248, 0.25);
  background: rgba(15, 22, 36, 0.9);
}

.form-textarea {
  resize: vertical;
  min-height: 120px;
}

.form-status-msg {
  display: none;
  margin-top: 1rem;
  padding: 0.85rem;
  border-radius: var(--radius-md);
  font-size: 0.9rem;
}

.form-status-msg.success {
  display: block;
  background: rgba(16, 185, 129, 0.15);
  border: 1px solid var(--color-discovery);
  color: #a7f3d0;
}

/* ==========================================================================
   FOOTER
   ========================================================================== */
.site-footer {
  background: #030407;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding: 4.5rem 0 3rem 0;
  position: relative;
  z-index: 2;
}

.footer-top-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid rgba(255, 255, 255, 0.07);
  padding-bottom: 3rem;
  margin-bottom: 2.5rem;
  flex-wrap: wrap;
  gap: 2rem;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.footer-tagline {
  color: var(--text-muted);
  font-size: 0.95rem;
}

.footer-nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
  list-style: none;
  flex-wrap: wrap;
}

.footer-nav-links a {
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  transition: color var(--duration-fast) ease;
}

.footer-nav-links a:hover {
  color: #ffffff;
}

.footer-bottom-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--text-muted);
  font-size: 0.85rem;
  flex-wrap: wrap;
  gap: 1.5rem;
}

.footer-legal-links {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.footer-legal-btn {
  color: var(--text-muted);
  font-size: 0.85rem;
  cursor: pointer;
  transition: color var(--duration-fast) ease;
}

.footer-legal-btn:hover {
  color: #ffffff;
}

/* ==========================================================================
   ACCESSIBLE DIALOG MODALS (Privacy Policy & Terms of Use)
   ========================================================================== */
.legal-modal {
  display: none;
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: var(--radius-xl);
  background: var(--bg-surface-elevated);
  color: var(--text-primary);
  max-width: 780px;
  width: 90vw;
  max-height: 85vh;
  margin: auto;
  padding: 0;
  box-shadow: 0 40px 80px rgba(0, 0, 0, 0.85);
  backdrop-filter: blur(32px);
  position: fixed;
  inset: 0;
  overflow: hidden;
  z-index: 1000;
}

.legal-modal[open] {
  display: flex;
  flex-direction: column;
}

.legal-modal::backdrop {
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(8px);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.5rem 2rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.modal-title {
  font-size: 1.4rem;
  font-weight: 700;
  color: #ffffff;
}

.modal-close-btn {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.08);
  color: var(--text-secondary);
  transition: all var(--duration-fast) ease;
}

.modal-close-btn:hover {
  background: rgba(255, 255, 255, 0.2);
  color: #ffffff;
}

.modal-body {
  padding: 2rem;
  overflow-y: auto;
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--text-secondary);
}

.modal-body h4 {
  color: #ffffff;
  margin-top: 1.5rem;
  margin-bottom: 0.5rem;
}

.modal-body p {
  margin-bottom: 1rem;
  font-size: 0.95rem;
}

.modal-footer {
  padding: 1.25rem 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  display: flex;
  justify-content: flex-end;
}

/* ==========================================================================
   RESPONSIVE BREAKPOINTS
   ========================================================================== */
@media (max-width: 1024px) {
  .nav-menu { display: none; }
  .mobile-nav-toggle { display: flex; }
  .edition-showcase-stage {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .edition-meta-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .player-showcase-container {
    grid-template-columns: 1fr;
  }
  .experience-features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .contact-layout-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .moments-grid {
    grid-template-columns: 1fr;
  }
  .subjects-grid {
    grid-template-columns: 1fr;
  }
  .form-group-row {
    grid-template-columns: 1fr;
  }
  .experience-features-grid {
    grid-template-columns: 1fr;
  }
  .edition-meta-grid {
    grid-template-columns: 1fr;
  }
}

/* ==========================================================================
   REDUCED MOTION SUPPORT (Accessibility)
   ========================================================================== */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}

/* Horizontal scrolling for tabs on mobile */
@media (max-width: 768px) {
  .editions-tab-list, .topic-categories-nav {
    flex-wrap: nowrap;
    justify-content: flex-start;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    padding-bottom: 0.5rem;
    scrollbar-width: none;
  }
  .editions-tab-list::-webkit-scrollbar, .topic-categories-nav::-webkit-scrollbar {
    display: none;
  }
  .edition-tab-btn, .topic-filter-btn {
    white-space: nowrap;
    flex-shrink: 0;
  }
}