/* ==========================================================================
   Pre-compiled Responsive Utility Layer (Instant 0ms First-Paint & Offline)
   ========================================================================== */
h1, h2, h3, h4, p { margin: 0; }
.fixed { position: fixed; }
.relative { position: relative; }
.absolute { position: absolute; }
.inset-0 { top: 0; right: 0; bottom: 0; left: 0; }
.inset-x-0 { left: 0; right: 0; }
.top-0 { top: 0; }
.-top-3 { top: -0.75rem; }
.-right-3 { right: -0.75rem; }
.z-50 { z-index: 50; }
.z-\[100\] { z-index: 100; }
.mx-auto { margin-left: auto; margin-right: auto; }
.my-auto { margin-top: auto; margin-bottom: auto; }
.mt-0\.5 { margin-top: 0.125rem; }
.mt-3 { margin-top: 0.75rem; }
.max-w-\[1200px\] { max-width: 1200px; }
.max-w-\[520px\] { max-width: 520px; }
.max-w-xl { max-width: 36rem; }
.max-w-4xl { max-width: 56rem; }
.max-h-\[90vh\] { max-height: 90vh; }
.max-h-\[80vh\] { max-height: 80vh; }
.w-full { width: 100%; }
.w-auto { width: auto; }
.w-2 { width: 0.5rem; }
.h-2 { height: 0.5rem; }
.w-3\.5 { width: 0.875rem; }
.h-3\.5 { height: 0.875rem; }
.w-4 { width: 1rem; }
.h-4 { height: 1rem; }
.w-5 { width: 1.25rem; }
.h-5 { height: 1.25rem; }
.w-8 { width: 2rem; }
.h-8 { height: 2rem; }
.w-9 { width: 2.25rem; }
.h-9 { height: 2.25rem; }
.h-14 { height: 3.5rem; }
.flex { display: flex; }
.inline-flex { display: inline-flex; }
.grid { display: grid; }
.hidden { display: none !important; }
.grid-cols-1 { grid-template-columns: repeat(1, minmax(0, 1fr)); }
.flex-col { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.items-center { align-items: center; }
.items-baseline { align-items: baseline; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.justify-end { justify-content: flex-end; }
.self-start { align-self: flex-start; }
.self-end { align-self: flex-end; }
.self-center { align-self: center; }
.flex-1 { flex: 1 1 0%; }
.shrink-0 { flex-shrink: 0; }
.gap-1\.5 { gap: 0.375rem; }
.gap-2 { gap: 0.5rem; }
.gap-2\.5 { gap: 0.625rem; }
.gap-3 { gap: 0.75rem; }
.gap-3\.5 { gap: 0.875rem; }
.gap-4 { gap: 1rem; }
.space-y-0\.5 > :not([hidden]) ~ :not([hidden]) { margin-top: 0.125rem; }
.space-y-1\.5 > :not([hidden]) ~ :not([hidden]) { margin-top: 0.375rem; }
.space-y-2 > :not([hidden]) ~ :not([hidden]) { margin-top: 0.5rem; }
.space-y-3 > :not([hidden]) ~ :not([hidden]) { margin-top: 0.75rem; }
.space-y-3\.5 > :not([hidden]) ~ :not([hidden]) { margin-top: 0.875rem; }
.p-3\.5 { padding: 0.875rem; }
.p-4 { padding: 1rem; }
.px-1\.5 { padding-left: 0.375rem; padding-right: 0.375rem; }
.px-2 { padding-left: 0.5rem; padding-right: 0.5rem; }
.px-3\.5 { padding-left: 0.875rem; padding-right: 0.875rem; }
.py-0\.5 { padding-top: 0.125rem; padding-bottom: 0.125rem; }
.py-1 { padding-top: 0.25rem; padding-bottom: 0.25rem; }
.py-2 { padding-top: 0.5rem; padding-bottom: 0.5rem; }
.pt-0\.5 { padding-top: 0.125rem; }
.pt-14 { padding-top: 3.5rem; }
.pt-2\.5 { padding-top: 0.625rem; }
.pt-3 { padding-top: 0.75rem; }
.pb-2\.5 { padding-bottom: 0.625rem; }
.pl-1\.5 { padding-left: 0.375rem; }
.!px-2\.5 { padding-left: 0.625rem !important; padding-right: 0.625rem !important; }
.!py-1 { padding-top: 0.25rem !important; padding-bottom: 0.25rem !important; }
.!px-3\.5 { padding-left: 0.875rem !important; padding-right: 0.875rem !important; }
.!px-4 { padding-left: 1rem !important; padding-right: 1rem !important; }
.!py-2 { padding-top: 0.5rem !important; padding-bottom: 0.5rem !important; }
.!text-xs { font-size: 0.75rem !important; line-height: 1rem !important; }
.rounded-xl { border-radius: 0.75rem; }
.rounded-2xl { border-radius: 1rem; }
.rounded-full { border-radius: 9999px; }
.border { border-width: 1px; border-style: solid; }
.border-b { border-bottom-width: 1px; border-bottom-style: solid; }
.border-t { border-top-width: 1px; border-top-style: solid; }
.border-l { border-left-width: 1px; border-left-style: solid; }
.border-\[var\(--border-soft\)\] { border-color: var(--border-soft); }
.border-\[var\(--border-strong\)\] { border-color: var(--border-strong); }
.border-current\/25 { border-color: rgba(255,255,255,0.25); }
.bg-\[var\(--bg-card\)\] { background-color: var(--bg-card); }
.bg-\[var\(--bg-recessed\)\] { background-color: var(--bg-recessed); }
.bg-\[var\(--badge-bg\)\] { background-color: var(--badge-bg); }
.bg-\[\#EAE3D2\] { background-color: #EAE3D2; }
.bg-white { background-color: #ffffff; }
.bg-\[\#DFCFAF\] { background-color: #DFCFAF; }
.bg-\[\#18181B\] { background-color: #18181B; }
.border-stone-400 { border-color: #a8a29e; }
.border-stone-300 { border-color: #d6d3d1; }
.border-stone-600 { border-color: #57534e; }
.border-amber-800\/40 { border-color: rgba(146, 64, 14, 0.4); }
.text-\[9\.5px\] { font-size: 9.5px; }
.text-\[10px\] { font-size: 10px; }
.text-\[11px\] { font-size: 11px; }
.text-xs { font-size: 0.75rem; line-height: 1rem; }
.text-\[13px\] { font-size: 13px; }
.text-\[13\.5px\] { font-size: 13.5px; }
.text-sm { font-size: 0.875rem; line-height: 1.25rem; }
.text-base { font-size: 1rem; line-height: 1.5rem; }
.text-\[19px\] { font-size: 19px; }
.text-2xl { font-size: 1.5rem; line-height: 2rem; }
.text-\[26px\] { font-size: 26px; }
.font-normal { font-weight: 400; }
.font-medium { font-weight: 500; }
.font-semibold { font-weight: 600; }
.leading-\[1\.1\] { line-height: 1.1; }
.leading-\[1\.12\] { line-height: 1.12; }
.leading-relaxed { line-height: 1.625; }
.tracking-tight { letter-spacing: -0.025em; }
.tracking-wider { letter-spacing: 0.05em; }
.tracking-widest { letter-spacing: 0.08em; }
.uppercase { text-transform: uppercase; }
.truncate { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.text-\[var\(--text-primary\)\] { color: var(--text-primary); }
.text-\[var\(--text-secondary\)\] { color: var(--text-secondary); }
.text-\[var\(--text-muted\)\] { color: var(--text-muted); }
.opacity-80 { opacity: 0.8; }
.cursor-pointer { cursor: pointer; }
.text-decoration-none { text-decoration: none; }

@media (min-width: 640px) {
  .sm\:inline-block { display: inline-block !important; }
  .sm\:inline-flex { display: inline-flex !important; }
  .sm\:flex { display: flex !important; }
  .sm\:flex-row { flex-direction: row; }
  .sm\:flex-initial { flex: 0 1 auto; }
  .sm\:items-center { align-items: center; }
  .sm\:px-6 { padding-left: 1.5rem; padding-right: 1.5rem; }
  .sm\:!px-5 { padding-left: 1.25rem !important; padding-right: 1.25rem !important; }
  .sm\:h-16 { height: 4rem; }
  .sm\:w-9 { width: 2.25rem; }
  .sm\:h-9 { height: 2.25rem; }
  .sm\:w-6 { width: 1.5rem; }
  .sm\:h-6 { height: 1.5rem; }
  .sm\:pt-20 { padding-top: 5rem; }
  .sm\:pb-4 { padding-bottom: 1rem; }
  .sm\:py-5 { padding-top: 1.25rem; padding-bottom: 1.25rem; }
  .sm\:p-5 { padding: 1.25rem; }
  .sm\:pt-3 { padding-top: 0.75rem; }
  .sm\:gap-3 { gap: 0.75rem; }
  .sm\:space-y-2 > :not([hidden]) ~ :not([hidden]) { margin-top: 0.5rem; }
  .sm\:space-y-4 > :not([hidden]) ~ :not([hidden]) { margin-top: 1rem; }
  .sm\:space-y-5 > :not([hidden]) ~ :not([hidden]) { margin-top: 1.25rem; }
  .sm\:text-\[10\.5px\] { font-size: 10.5px; }
  .sm\:text-\[11px\] { font-size: 11px; }
  .sm\:text-sm { font-size: 0.875rem; line-height: 1.25rem; }
  .sm\:text-\[15px\] { font-size: 15px; }
  .sm\:text-\[16px\] { font-size: 16px; }
  .sm\:text-xl { font-size: 1.25rem; line-height: 1.75rem; }
  .sm\:text-4xl { font-size: 2.25rem; line-height: 2.5rem; }
  .sm\:text-5xl { font-size: 3rem; line-height: 1.08; }
}

@media (min-width: 768px) {
  .md\:hidden { display: none !important; }
  .md\:inline-flex { display: inline-flex !important; }
}

@media (min-width: 1024px) {
  .lg\:flex { display: flex !important; }
  .lg\:grid-cols-12 { grid-template-columns: repeat(12, minmax(0, 1fr)); }
  .lg\:col-span-5 { grid-column: span 5 / span 5; }
  .lg\:col-span-6 { grid-column: span 6 / span 6; }
  .lg\:col-span-7 { grid-column: span 7 / span 7; }
  .lg\:col-start-1 { grid-column-start: 1; }
  .lg\:col-start-7 { grid-column-start: 7; }
  .lg\:col-start-8 { grid-column-start: 8; }
  .lg\:row-start-1 { grid-row-start: 1; }
  .lg\:row-start-2 { grid-row-start: 2; }
  .lg\:row-span-2 { grid-row: span 2 / span 2; }
  .lg\:gap-10 { gap: 2.5rem; }
  .lg\:gap-x-8 { column-gap: 2rem; }
  .lg\:gap-y-4 { row-gap: 1rem; }
}

@media (min-width: 1280px) {
  .xl\:flex { display: flex !important; }
  .xl\:text-\[52px\] { font-size: 52px; }
}

/* ==========================================================================
   Llunevie Editorial Web Showcase — Design Tokens & Scroll-Card Engine
   ========================================================================== */

:root,
[data-theme="paper"] {
  --bg-app: #F4F0E6;
  --bg-card: #FAF8F3;
  --bg-recessed: #EAE3D5;
  --bg-stage: rgba(234, 227, 213, 0.52);
  --bg-elevated: #FFFFFF;
  --text-primary: #1C1915;
  --text-secondary: #5A5347;
  --text-muted: #8A8070;
  --border-soft: rgba(28, 25, 21, 0.08);
  --border-strong: rgba(28, 25, 21, 0.15);
  --accent-fill: #1C1915;
  --accent-text: #FAF8F3;
  --badge-bg: rgba(28, 25, 21, 0.06);
  --nav-glass: rgba(244, 240, 230, 0.88);
  --card-shadow: 0 22px 56px -16px rgba(24, 20, 14, 0.09), 0 4px 14px -4px rgba(24, 20, 14, 0.04);
  --phone-bezel: #1A1917;
  --phone-ring: rgba(28, 25, 21, 0.14);
}

[data-theme="white"] {
  --bg-app: #F6F6F4;
  --bg-card: #FFFFFF;
  --bg-recessed: #EDEDEB;
  --bg-stage: rgba(237, 237, 235, 0.58);
  --bg-elevated: #FFFFFF;
  --text-primary: #141416;
  --text-secondary: #52525B;
  --text-muted: #86868E;
  --border-soft: rgba(20, 20, 22, 0.08);
  --border-strong: rgba(20, 20, 22, 0.14);
  --accent-fill: #141416;
  --accent-text: #FFFFFF;
  --badge-bg: rgba(20, 20, 22, 0.05);
  --nav-glass: rgba(246, 246, 244, 0.88);
  --card-shadow: 0 22px 56px -16px rgba(15, 15, 20, 0.07), 0 4px 14px -4px rgba(15, 15, 20, 0.04);
  --phone-bezel: #18181B;
  --phone-ring: rgba(20, 20, 22, 0.14);
}

[data-theme="sepia"] {
  --bg-app: #EDE3D0;
  --bg-card: #F6EFE2;
  --bg-recessed: #E2D5BE;
  --bg-stage: rgba(226, 213, 190, 0.55);
  --bg-elevated: #FAF5EB;
  --text-primary: #2B2117;
  --text-secondary: #675643;
  --text-muted: #927E67;
  --border-soft: rgba(43, 33, 23, 0.09);
  --border-strong: rgba(43, 33, 23, 0.17);
  --accent-fill: #2B2117;
  --accent-text: #F6EFE2;
  --badge-bg: rgba(43, 33, 23, 0.07);
  --nav-glass: rgba(237, 227, 208, 0.88);
  --card-shadow: 0 22px 56px -16px rgba(38, 27, 14, 0.11), 0 4px 14px -4px rgba(38, 27, 14, 0.05);
  --phone-bezel: #241D15;
  --phone-ring: rgba(43, 33, 23, 0.16);
}

[data-theme="black"] {
  --bg-app: #0D0E11;
  --bg-card: #15171C;
  --bg-recessed: #1E2027;
  --bg-stage: rgba(30, 32, 39, 0.65);
  --bg-elevated: #252831;
  --text-primary: #F3F1EC;
  --text-secondary: #A0A3AD;
  --text-muted: #6E727E;
  --border-soft: rgba(243, 241, 236, 0.08);
  --border-strong: rgba(243, 241, 236, 0.15);
  --accent-fill: #F3F1EC;
  --accent-text: #121316;
  --badge-bg: rgba(243, 241, 236, 0.07);
  --nav-glass: rgba(13, 14, 17, 0.88);
  --card-shadow: 0 26px 68px -16px rgba(0, 0, 0, 0.65), 0 6px 18px -4px rgba(0, 0, 0, 0.45);
  --phone-bezel: #23262E;
  --phone-ring: rgba(255, 255, 255, 0.15);
}

* {
  box-sizing: border-box;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  -webkit-tap-highlight-color: transparent;
}

html {
  scroll-behavior: smooth;
  background-color: var(--bg-app);
  color: var(--text-primary);
  font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  transition: background-color 0.35s cubic-bezier(0.22, 1, 0.36, 1), color 0.35s cubic-bezier(0.22, 1, 0.36, 1);
}

body {
  margin: 0;
  padding: 0;
  background-color: var(--bg-app);
  color: var(--text-primary);
  overflow-x: hidden;
  transition: background-color 0.35s cubic-bezier(0.22, 1, 0.36, 1);
}

.font-serif-editorial {
  font-family: 'Newsreader', Georgia, serif;
}

.font-mono-code {
  font-family: 'JetBrains Mono', monospace;
}

.paper-grain {
  background-image: radial-gradient(rgba(28, 25, 21, 0.028) 1px, transparent 0);
  background-size: 24px 24px;
}
[data-theme="black"] .paper-grain {
  background-image: radial-gradient(rgba(255, 255, 255, 0.022) 1px, transparent 0);
}

.top-nav-glass {
  background: var(--nav-glass);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--border-soft);
}

/* Segmented Track & Pills */
.segmented-track {
  background: var(--bg-recessed);
  border: 1px solid var(--border-soft);
  border-radius: 9999px;
  padding: 3px;
  display: inline-flex;
  align-items: center;
  gap: 2px;
  max-width: 100%;
  overflow-x: auto;
  scrollbar-width: none;
}
.segmented-track::-webkit-scrollbar {
  display: none;
}

.segmented-pill {
  border-radius: 9999px;
  padding: 5px 11px;
  font-size: 11.5px;
  font-weight: 500;
  color: var(--text-secondary);
  background: transparent;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.22, 1, 0.36, 1);
  user-select: none;
  white-space: nowrap;
}

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

.segmented-pill.active {
  background: var(--bg-elevated);
  color: var(--text-primary);
  font-weight: 600;
  border-color: var(--border-soft);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
}

/* Compact Theme Color Dots (Header) */
.theme-dots-track {
  background: var(--bg-recessed);
  border: 1px solid var(--border-soft);
  border-radius: 9999px;
  padding: 3.5px 5px;
  display: inline-flex;
  align-items: center;
  gap: 5px;
}

.theme-dot-btn {
  width: 18px;
  height: 18px;
  border-radius: 9999px;
  padding: 0;
  cursor: pointer;
  position: relative;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.theme-dot-btn.active {
  transform: scale(1.15);
  box-shadow: 0 0 0 2px var(--bg-card), 0 0 0 3.5px var(--text-primary);
}

/* Buttons */
.btn-primary {
  background: var(--accent-fill);
  color: var(--accent-text);
  border: 1px solid var(--accent-fill);
  border-radius: 9999px;
  padding: 11px 20px;
  font-size: 13px;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  text-decoration: none;
  cursor: pointer;
  white-space: nowrap;
  transition: transform 0.2s cubic-bezier(0.22, 1, 0.36, 1), box-shadow 0.2s ease;
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 20px -6px rgba(0, 0, 0, 0.2);
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--text-primary);
  border: 1px solid var(--border-strong);
  border-radius: 9999px;
  padding: 11px 18px;
  font-size: 13px;
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  text-decoration: none;
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.2s cubic-bezier(0.22, 1, 0.36, 1);
}

.btn-secondary:hover {
  background: var(--bg-recessed);
  transform: translateY(-1px);
}

/* ==========================================================================
   SCROLL-DRIVEN STICKY CARD-STACK FADE ENGINE
   ========================================================================== */

.deck-stage-container {
  position: relative;
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 14px 18px 80px 18px;
}

.chapter-card-slot {
  position: sticky;
  top: 74px;
  min-height: calc(100vh - 94px);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 9vh;
}

.chapter-card {
  width: 100%;
  min-height: calc(100vh - 104px);
  background: var(--bg-card);
  border: 1px solid var(--border-strong);
  border-radius: 28px;
  box-shadow: var(--card-shadow);
  padding: 28px 34px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
  overflow: hidden;
  transform-origin: center top;
  will-change: transform, opacity, filter;
  transition: background-color 0.35s cubic-bezier(0.22, 1, 0.36, 1), border-color 0.35s ease;
}

@media (max-width: 767px) {
  .deck-stage-container {
    padding: 6px 12px 52px 12px;
  }
  .chapter-card-slot {
    top: 60px;
    min-height: auto;
    margin-bottom: 18px;
  }
  .chapter-card {
    padding: 18px 16px 20px 16px;
    border-radius: 24px;
    min-height: auto;
    gap: 14px;
  }
}

/* ==========================================================================
   RECESSED DEVICE SHOWCASE STAGE & ULTRA-SLIM FRAMES (2.5px Bezel)
   ========================================================================== */

.device-showcase-well {
  background: var(--bg-stage);
  border: 1px solid var(--border-soft);
  border-radius: 20px;
  padding: 14px 12px 16px 12px;
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

@media (min-width: 640px) {
  .device-showcase-well {
    border-radius: 24px;
    padding: 18px 20px 22px 20px;
    gap: 16px;
  }
}

.phone-frame {
  background: var(--phone-bezel);
  border-radius: 20px;
  padding: 2.5px;
  box-shadow:
    0 16px 36px -10px rgba(0, 0, 0, 0.24),
    0 0 0 1px var(--phone-ring);
  position: relative;
  transition: transform 0.35s cubic-bezier(0.22, 1, 0.36, 1), box-shadow 0.35s ease;
  user-select: none;
}

@media (min-width: 640px) {
  .phone-frame {
    border-radius: 24px;
  }
}

.phone-frame-screen {
  border-radius: 17.5px;
  overflow: hidden;
  background: #141416;
  position: relative;
  width: 100%;
  aspect-ratio: 9 / 19.3;
}

@media (min-width: 640px) {
  .phone-frame-screen {
    border-radius: 21.5px;
  }
}

.phone-frame-screen img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top center;
  display: block;
  transition: transform 0.35s cubic-bezier(0.22, 1, 0.36, 1);
}

.phone-frame:hover {
  transform: translateY(-2px);
}

/* Symmetrical Dual-Phone Pair Stage */
.phone-pair-stage {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  width: 100%;
}

@media (min-width: 640px) {
  .phone-pair-stage {
    gap: 18px;
  }
}

.phone-pair-item {
  width: 46%;
  max-width: 152px;
  flex-shrink: 0;
}

@media (min-width: 640px) {
  .phone-pair-item {
    width: 196px;
    max-width: 196px;
  }
}

.phone-single-item {
  width: 54%;
  max-width: 168px;
  flex-shrink: 0;
}

@media (min-width: 640px) {
  .phone-single-item {
    width: 212px;
    max-width: 212px;
  }
}

/* Landscape 2-Page Spread Frame — Ultra-Thin Bezel */
.landscape-frame {
  background: var(--phone-bezel);
  border-radius: 16px;
  padding: 2.5px;
  box-shadow:
    0 18px 40px -12px rgba(0, 0, 0, 0.26),
    0 0 0 1px var(--phone-ring);
  transition: all 0.35s cubic-bezier(0.22, 1, 0.36, 1);
}

.landscape-frame-screen {
  border-radius: 13.5px;
  overflow: hidden;
  background: #141416;
  aspect-ratio: 16 / 7.25;
}

.landscape-frame-screen img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* Interactive 3-Phone Hero Stage */
.hero-phones-stage {
  position: relative;
  height: 430px;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-phone-slot {
  position: absolute;
  width: 204px;
  cursor: pointer;
  transition: all 0.46s cubic-bezier(0.22, 1, 0.36, 1);
}

.hero-phone-slot.pos-center {
  transform: translate3d(0, 0, 0) scale(1);
  z-index: 30;
  opacity: 1;
}

.hero-phone-slot.pos-left {
  transform: translate3d(-118px, 14px, 0) scale(0.86) rotate(-4deg);
  z-index: 20;
  opacity: 0.85;
}

.hero-phone-slot.pos-right {
  transform: translate3d(118px, 14px, 0) scale(0.86) rotate(4deg);
  z-index: 20;
  opacity: 0.85;
}

.hero-phone-slot.pos-left:hover,
.hero-phone-slot.pos-right:hover {
  opacity: 0.96;
}

@media (max-width: 639px) {
  .hero-phones-stage {
    height: 292px;
    margin-top: 2px;
  }
  .hero-phone-slot {
    width: 134px;
  }
  .hero-phone-slot.pos-left {
    transform: translate3d(-68px, 10px, 0) scale(0.86) rotate(-3.5deg);
  }
  .hero-phone-slot.pos-right {
    transform: translate3d(68px, 10px, 0) scale(0.86) rotate(3.5deg);
  }
}

/* ==========================================================================
   EDITORIAL FEATURE LIST (Clean Hairline Rows on Mobile, Cards on Desktop)
   ========================================================================== */

.feature-stack {
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--border-soft);
}

.feature-row {
  display: flex;
  align-items: flex-start;
  gap: 11px;
  padding: 11px 2px;
  border-bottom: 1px solid var(--border-soft);
}

.feature-num {
  font-family: 'JetBrains Mono', monospace;
  font-size: 10.5px;
  font-weight: 600;
  color: var(--text-muted);
  background: var(--bg-recessed);
  border: 1px solid var(--border-soft);
  border-radius: 6px;
  padding: 2px 6px;
  line-height: 1.4;
  flex-shrink: 0;
  margin-top: 1px;
}

@media (min-width: 1024px) {
  .feature-stack {
    border-top: none;
    gap: 10px;
  }
  .feature-row {
    background: var(--bg-app);
    border: 1px solid var(--border-soft);
    border-radius: 16px;
    padding: 13px 16px;
    transition: border-color 0.2s ease;
  }
  .feature-row:hover {
    border-color: var(--border-strong);
  }
}

/* Right-Edge Chapter Navigation Rail */
.chapter-rail {
  position: fixed;
  right: 18px;
  top: 50%;
  transform: translateY(-50%);
  z-index: 60;
  display: flex;
  flex-direction: column;
  gap: 9px;
  background: var(--nav-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border-strong);
  padding: 9px 6px;
  border-radius: 9999px;
}

.rail-dot {
  width: 7px;
  height: 7px;
  border-radius: 9999px;
  background: var(--text-muted);
  opacity: 0.4;
  border: none;
  padding: 0;
  cursor: pointer;
  transition: all 0.25s cubic-bezier(0.22, 1, 0.36, 1);
}

.rail-dot:hover {
  opacity: 0.85;
  transform: scale(1.2);
}

.rail-dot.active {
  height: 22px;
  background: var(--accent-fill);
  opacity: 1;
}

/* Lightbox Modal */
.lightbox-backdrop {
  background: rgba(10, 10, 12, 0.86);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}