/* ==========================================================================
   INTERACTIVE FLIPBOOK VIEWER — ZIDHANZID LUXURY EXPERIENCE
   Ultra-realistic 3D page flip with Mozilla PDF.js & StPageFlip
   ========================================================================== */

:root {
  --fb-bg: #040711;
  --fb-bg-surface: #070d1e;
  --fb-card-bg: rgba(8, 14, 30, 0.75);
  --fb-border: rgba(0, 245, 255, 0.16);
  --fb-border-glow: rgba(0, 245, 255, 0.45);
  --fb-accent-cyan: #00f5ff;
  --fb-accent-violet: #a855f7;
  --fb-accent-gradient: linear-gradient(135deg, #00f5ff 0%, #38bdf8 40%, #a855f7 80%, #b76eff 100%);
  --fb-text: #ffffff;
  --fb-text-muted: #94a3b8;
  --fb-glass: rgba(6, 11, 25, 0.82);
  --fb-font: 'Outfit', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --fb-transition: cubic-bezier(0.16, 1, 0.3, 1);
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background-color: var(--fb-bg);
  color: var(--fb-text);
  font-family: var(--fb-font);
  user-select: none;
  -webkit-font-smoothing: antialiased;
}

/* Ambient Cyber Glow Background */
.fb-ambient-bg {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

.fb-ambient-glow-1 {
  position: absolute;
  top: -10%;
  left: 20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(0, 245, 255, 0.12) 0%, rgba(0, 245, 255, 0) 70%);
  filter: blur(80px);
  animation: fbGlowPulse 10s ease-in-out infinite alternate;
}

.fb-ambient-glow-2 {
  position: absolute;
  bottom: -15%;
  right: 15%;
  width: 700px;
  height: 700px;
  background: radial-gradient(circle, rgba(168, 85, 247, 0.14) 0%, rgba(168, 85, 247, 0) 70%);
  filter: blur(90px);
  animation: fbGlowPulse 12s ease-in-out infinite alternate-reverse;
}

@keyframes fbGlowPulse {
  0% { transform: scale(1) translate(0, 0); opacity: 0.7; }
  50% { transform: scale(1.15) translate(30px, -20px); opacity: 1; }
  100% { transform: scale(0.9) translate(-20px, 30px); opacity: 0.6; }
}

/* Main Layout Grid */
.fb-app {
  position: relative;
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  z-index: 1;
}

/* Top Navigation Bar */
.fb-header {
  height: 54px;
  padding: 0 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--fb-glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--fb-border);
  z-index: 50;
  flex-shrink: 0;
}

.fb-brand-section {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.fb-back-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.45rem 0.85rem;
  border-radius: 9999px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: #ffffff;
  text-decoration: none;
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  transition: all 0.3s var(--fb-transition);
}

.fb-back-btn:hover {
  background: rgba(0, 245, 255, 0.12);
  border-color: var(--fb-accent-cyan);
  color: var(--fb-accent-cyan);
  box-shadow: 0 0 18px rgba(0, 245, 255, 0.3);
  transform: translateX(-2px);
}

.fb-brand-title {
  display: flex;
  flex-direction: column;
}

.fb-title-main {
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  background: var(--fb-accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.fb-title-badge {
  font-size: 0.65rem;
  padding: 0.15rem 0.45rem;
  border-radius: 4px;
  background: rgba(0, 245, 255, 0.15);
  border: 1px solid rgba(0, 245, 255, 0.3);
  color: var(--fb-accent-cyan);
  font-weight: 600;
  letter-spacing: 0.08em;
  -webkit-text-fill-color: var(--fb-accent-cyan);
}

.fb-title-sub {
  font-size: 0.72rem;
  color: var(--fb-text-muted);
  letter-spacing: 0.02em;
}

/* Header Action Controls */
.fb-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.fb-btn-icon {
  width: 38px;
  height: 38px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: #ffffff;
  cursor: pointer;
  transition: all 0.25s var(--fb-transition);
  text-decoration: none;
  font-size: 0.9rem;
  position: relative;
}

.fb-btn-icon:hover {
  background: rgba(0, 245, 255, 0.12);
  border-color: var(--fb-accent-cyan);
  color: var(--fb-accent-cyan);
  box-shadow: 0 0 15px rgba(0, 245, 255, 0.25);
}

.fb-btn-icon:active {
  transform: scale(0.95);
}

.fb-btn-icon.active {
  background: rgba(0, 245, 255, 0.2);
  border-color: var(--fb-accent-cyan);
  color: var(--fb-accent-cyan);
}

.fb-btn-icon svg {
  width: 18px;
  height: 18px;
}

/* Tooltip on hover */
.fb-btn-icon[data-tooltip]::before {
  content: attr(data-tooltip);
  position: absolute;
  bottom: -32px;
  left: 50%;
  transform: translateX(-50%) translateY(4px);
  background: rgba(6, 11, 25, 0.95);
  border: 1px solid var(--fb-border);
  color: #fff;
  padding: 0.25rem 0.55rem;
  border-radius: 6px;
  font-size: 0.7rem;
  white-space: nowrap;
  pointer-events: none;
  opacity: 0;
  transition: all 0.2s ease;
  z-index: 100;
  box-shadow: 0 4px 12px rgba(0,0,0,0.5);
}

.fb-btn-icon:hover[data-tooltip]::before {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* Middle Book Stage */
.fb-stage {
  flex: 1;
  min-height: 0; /* CRITICAL: prevents flex container from expanding past screen */
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  padding: 0.5rem 3.5rem;
}

/* Floating Navigation Arrows (Desktop / Tablet) */
.fb-nav-arrow {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: rgba(8, 14, 30, 0.65);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--fb-border);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 40;
  transition: all 0.3s var(--fb-transition);
}

.fb-nav-arrow:hover {
  background: rgba(0, 245, 255, 0.2);
  border-color: var(--fb-accent-cyan);
  color: var(--fb-accent-cyan);
  box-shadow: 0 0 25px rgba(0, 245, 255, 0.35);
  transform: translateY(-50%) scale(1.1);
}

.fb-nav-arrow:active {
  transform: translateY(-50%) scale(0.96);
}

.fb-nav-arrow.disabled {
  opacity: 0.25;
  cursor: not-allowed;
  pointer-events: none;
}

.fb-nav-arrow-prev {
  left: 1.25rem;
}

.fb-nav-arrow-next {
  right: 1.25rem;
}

.fb-nav-arrow svg {
  width: 22px;
  height: 22px;
}

/* Flipbook Container Wrapper */
.fb-viewport {
  position: relative;
  width: 100%;
  height: 100%;
  max-width: 100%;
  max-height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  perspective: 2500px;
}

/* Book Container */
#flipbook-book {
  position: relative;
  box-shadow: 0 25px 60px -15px rgba(0, 0, 0, 0.8), 0 0 40px rgba(0, 245, 255, 0.08);
  border-radius: 6px;
  transition: opacity 0.5s ease;
}

/* Individual Pages */
.fb-page {
  background-color: #0b1122;
  box-shadow: inset 0 0 30px rgba(0, 0, 0, 0.5);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: grab;
}

.fb-page:active {
  cursor: grabbing;
}

.fb-page-inner {
  position: relative;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: #0d1428;
}

.fb-page-inner canvas,
.fb-page-inner picture,
.fb-page-inner img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
  user-select: none;
  -webkit-user-drag: none;
  pointer-events: none;
}

/* Subtle Realistic Paper Spine Gradient */
.fb-page.--left .fb-page-inner::after {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  width: 35px;
  background: linear-gradient(to left, rgba(0, 0, 0, 0.45) 0%, rgba(0, 0, 0, 0.15) 50%, rgba(0, 0, 0, 0) 100%);
  pointer-events: none;
}

.fb-page.--right .fb-page-inner::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  width: 35px;
  background: linear-gradient(to right, rgba(0, 0, 0, 0.45) 0%, rgba(0, 0, 0, 0.15) 50%, rgba(0, 0, 0, 0) 100%);
  pointer-events: none;
}

/* Bottom Control Dock */
.fb-footer {
  height: 54px;
  padding: 0 1.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--fb-glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-top: 1px solid var(--fb-border);
  z-index: 50;
  flex-shrink: 0;
}

.fb-dock {
  display: flex;
  align-items: center;
  gap: 1rem;
  background: rgba(10, 18, 38, 0.7);
  border: 1px solid var(--fb-border);
  padding: 0.35rem 0.85rem;
  border-radius: 9999px;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.4);
}

.fb-dock-group {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.fb-dock-btn {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: transparent;
  border: 1px solid transparent;
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s var(--fb-transition);
}

.fb-dock-btn:hover {
  background: rgba(0, 245, 255, 0.15);
  border-color: var(--fb-accent-cyan);
  color: var(--fb-accent-cyan);
}

.fb-dock-btn:disabled {
  opacity: 0.25;
  cursor: not-allowed;
}

.fb-dock-btn svg {
  width: 15px;
  height: 15px;
}

/* Page Slider & Indicator */
.fb-page-indicator {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--fb-text-muted);
}

.fb-page-input {
  width: 38px;
  padding: 0.2rem 0.3rem;
  text-align: center;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 6px;
  color: #ffffff;
  font-family: inherit;
  font-size: 0.82rem;
  font-weight: 700;
  outline: none;
  transition: border-color 0.2s ease;
}

.fb-page-input:focus {
  border-color: var(--fb-accent-cyan);
  box-shadow: 0 0 10px rgba(0, 245, 255, 0.3);
}

.fb-slider-wrap {
  display: flex;
  align-items: center;
  width: 120px;
  margin: 0 0.4rem;
}

.fb-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 4px;
  background: rgba(255, 255, 255, 0.15);
  border-radius: 9999px;
  outline: none;
  cursor: pointer;
}

.fb-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--fb-accent-cyan);
  box-shadow: 0 0 8px var(--fb-accent-cyan);
  cursor: pointer;
  transition: transform 0.15s ease;
}

.fb-slider::-webkit-slider-thumb:hover {
  transform: scale(1.3);
}

.fb-dock-divider {
  width: 1px;
  height: 18px;
  background: rgba(255, 255, 255, 0.12);
}

/* Keyboard hint pill */
.fb-keyboard-hint {
  display: flex;
  align-items: center;
  gap: 0.3rem;
  font-size: 0.7rem;
  color: var(--fb-text-muted);
  padding: 0.2rem 0.5rem;
  background: rgba(255, 255, 255, 0.04);
  border-radius: 9999px;
}

.fb-kbd {
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 4px;
  padding: 0.1rem 0.35rem;
  font-size: 0.65rem;
  color: #fff;
  font-family: monospace;
}

/* Luxury Cyberpunk Loading Screen */
.fb-loader-overlay {
  position: absolute;
  inset: 0;
  background: var(--fb-bg);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 100;
  transition: opacity 0.5s ease, visibility 0.5s ease;
}

.fb-loader-overlay.hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.fb-loader-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 2.5rem 3rem;
  background: var(--fb-card-bg);
  border: 1px solid var(--fb-border);
  border-radius: 20px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.6), 0 0 40px rgba(0, 245, 255, 0.15);
  max-width: 440px;
  text-align: center;
}

.fb-spinner {
  width: 58px;
  height: 58px;
  position: relative;
  margin-bottom: 1.5rem;
}

.fb-spinner-circle {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  border: 3px solid rgba(0, 245, 255, 0.15);
  border-top-color: var(--fb-accent-cyan);
  border-right-color: var(--fb-accent-violet);
  animation: fbSpin 1.1s cubic-bezier(0.68, -0.55, 0.27, 1.55) infinite;
}

@keyframes fbSpin {
  100% { transform: rotate(360deg); }
}

.fb-loader-title {
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  margin-bottom: 0.4rem;
  background: var(--fb-accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.fb-loader-status {
  font-size: 0.82rem;
  color: var(--fb-text-muted);
  margin-bottom: 1.25rem;
}

.fb-progress-bar-wrap {
  width: 100%;
  height: 6px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: 9999px;
  overflow: hidden;
  position: relative;
}

.fb-progress-bar-fill {
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 0%;
  background: var(--fb-accent-gradient);
  border-radius: 9999px;
  transition: width 0.25s ease;
  box-shadow: 0 0 12px var(--fb-accent-cyan);
}

/* Toast Notification (Copy link, errors, etc.) */
.fb-toast {
  position: fixed;
  bottom: 85px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: rgba(7, 14, 32, 0.95);
  border: 1px solid var(--fb-accent-cyan);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.6), 0 0 20px rgba(0, 245, 255, 0.3);
  color: #fff;
  padding: 0.6rem 1.2rem;
  border-radius: 9999px;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  opacity: 0;
  pointer-events: none;
  transition: all 0.3s var(--fb-transition);
  z-index: 200;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.fb-toast.show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

/* ==========================================================================
   MOBILE SWIPE ONBOARDING HINT
   ========================================================================== */
.fb-swipe-hint {
  position: absolute;
  bottom: 1.25rem;
  left: 50%;
  transform: translateX(-50%);
  display: none;
  align-items: center;
  gap: 0.45rem;
  padding: 0.45rem 1rem;
  background: rgba(6, 12, 28, 0.88);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--fb-border-glow);
  border-radius: 9999px;
  color: var(--fb-accent-cyan);
  font-size: 0.74rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  pointer-events: none;
  z-index: 35;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.6), 0 0 15px rgba(0, 245, 255, 0.2);
  animation: fbSwipePulse 2.4s ease-in-out infinite;
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.fb-swipe-hint.fade-out {
  opacity: 0;
  transform: translateX(-50%) translateY(12px);
  pointer-events: none;
}

@keyframes fbSwipePulse {
  0%, 100% { opacity: 0.88; transform: translateX(-50%) scale(1); }
  50% { opacity: 1; transform: translateX(-50%) scale(1.03); }
}

/* ==========================================================================
   HD ZOOM / INSPECTION LIGHTBOX MODAL
   ========================================================================== */
.fb-zoom-modal {
  position: fixed;
  inset: 0;
  z-index: 500;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}

.fb-zoom-modal.active {
  opacity: 1;
  visibility: visible;
}

.fb-zoom-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(3, 7, 18, 0.94);
  backdrop-filter: blur(25px);
  -webkit-backdrop-filter: blur(25px);
}

.fb-zoom-container {
  position: relative;
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  z-index: 1;
}

.fb-zoom-header {
  height: 52px;
  padding: 0 1.25rem;
  padding-top: env(safe-area-inset-top, 0px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(6, 11, 25, 0.9);
  border-bottom: 1px solid var(--fb-border);
  flex-shrink: 0;
}

.fb-zoom-title {
  font-size: 0.88rem;
  font-weight: 700;
  color: #ffffff;
  letter-spacing: 0.04em;
}

.fb-zoom-actions {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.fb-zoom-tip {
  font-size: 0.72rem;
  color: var(--fb-text-muted);
}

.fb-zoom-close {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s ease;
}

.fb-zoom-close:hover {
  background: rgba(255, 80, 80, 0.2);
  border-color: #ff5050;
  color: #ff5050;
  transform: rotate(90deg);
}

.fb-zoom-close svg {
  width: 18px;
  height: 18px;
}

.fb-zoom-body {
  flex: 1;
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  touch-action: none;
  cursor: grab;
  padding: 1rem;
}

.fb-zoom-body:active {
  cursor: grabbing;
}

.fb-zoom-img-wrap {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  transform-origin: center center;
  transition: transform 0.08s ease-out;
  will-change: transform;
}

.fb-zoom-canvas,
.fb-zoom-img {
  display: block;
  max-width: 92vw;
  max-height: calc(85vh - 110px);
  object-fit: contain;
  border-radius: 6px;
  box-shadow: 0 25px 60px rgba(0, 0, 0, 0.85), 0 0 35px rgba(0, 245, 255, 0.2);
  user-select: none;
  -webkit-user-drag: none;
}

.fb-zoom-footer {
  height: 54px;
  padding: 0 1.25rem;
  padding-bottom: env(safe-area-inset-bottom, 0px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(6, 11, 25, 0.9);
  border-top: 1px solid var(--fb-border);
  flex-shrink: 0;
}

.fb-zoom-nav-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.45rem 1rem;
  border-radius: 9999px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--fb-border);
  color: #ffffff;
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
}

.fb-zoom-nav-btn:hover {
  background: rgba(0, 245, 255, 0.15);
  border-color: var(--fb-accent-cyan);
  color: var(--fb-accent-cyan);
}

.fb-zoom-nav-btn:disabled {
  opacity: 0.25;
  cursor: not-allowed;
}

.fb-zoom-nav-btn svg {
  width: 15px;
  height: 15px;
}

.fb-zoom-page-indicator {
  font-size: 0.84rem;
  font-weight: 700;
  color: var(--fb-accent-cyan);
  letter-spacing: 0.05em;
}

/* ==========================================================================
   MOBILE & TABLET RESPONSIVENESS
   ========================================================================== */

/* Safe area support across all devices */
.fb-header {
  padding-top: env(safe-area-inset-top, 0px);
  padding-left: max(1.25rem, env(safe-area-inset-left, 0px));
  padding-right: max(1.25rem, env(safe-area-inset-right, 0px));
}

.fb-footer {
  padding-bottom: env(safe-area-inset-bottom, 0px);
  padding-left: max(1.25rem, env(safe-area-inset-left, 0px));
  padding-right: max(1.25rem, env(safe-area-inset-right, 0px));
}

/* Tablets and Mobile Phones (< 768px) */
@media (max-width: 768px) {
  .fb-header {
    height: 52px;
    padding-left: max(0.75rem, env(safe-area-inset-left, 0px));
    padding-right: max(0.75rem, env(safe-area-inset-right, 0px));
  }

  .fb-brand-section {
    gap: 0.6rem;
  }

  .fb-back-btn {
    padding: 0.35rem 0.65rem;
    font-size: 0.76rem;
  }

  .fb-title-sub,
  .fb-keyboard-hint,
  .fb-slider-wrap {
    display: none !important;
  }

  .fb-title-main {
    font-size: 0.82rem;
    gap: 0.35rem;
  }

  .fb-title-badge {
    font-size: 0.58rem;
    padding: 0.1rem 0.35rem;
  }

  .fb-actions {
    gap: 0.35rem;
  }

  .fb-btn-icon {
    width: 34px;
    height: 34px;
    border-radius: 8px;
  }

  .fb-btn-icon svg {
    width: 16px;
    height: 16px;
  }

  /* Stage & Book Viewport */
  .fb-stage {
    padding: 0.5rem 0.5rem;
  }

  .fb-nav-arrow {
    display: none !important; /* Mobile uses natural touch swipe gestures */
  }

  .fb-swipe-hint {
    display: inline-flex; /* Activated on mobile */
  }

  /* Dock on mobile */
  .fb-footer {
    height: calc(54px + env(safe-area-inset-bottom, 0px));
    padding-left: max(0.5rem, env(safe-area-inset-left, 0px));
    padding-right: max(0.5rem, env(safe-area-inset-right, 0px));
  }

  .fb-dock {
    gap: 0.5rem;
    padding: 0.3rem 0.65rem;
  }

  .fb-dock-btn {
    width: 36px;
    height: 36px;
  }

  .fb-dock-btn svg {
    width: 16px;
    height: 16px;
  }

  .fb-page-indicator {
    font-size: 0.78rem;
    gap: 0.3rem;
  }

  .fb-page-input {
    width: 34px;
    padding: 0.15rem 0.2rem;
    font-size: 0.78rem;
  }

  .fb-loader-card {
    padding: 2rem 1.25rem;
    margin: 1rem;
    max-width: 90vw;
  }

  .fb-zoom-tip {
    display: none;
  }
}

/* Compact Smartphones (iPhone SE, Small Androids <= 480px) */
@media (max-width: 480px) {
  .fb-header {
    height: 50px;
    padding-left: max(0.5rem, env(safe-area-inset-left, 0px));
    padding-right: max(0.5rem, env(safe-area-inset-right, 0px));
  }

  .fb-back-btn span {
    display: inline;
    font-size: 0.72rem;
  }

  .fb-title-main {
    font-size: 0.76rem;
  }

  /* Hide First & Last buttons on narrow screens to give Prev / Page / Next maximum thumb space */
  #dock-first,
  #dock-last {
    display: none !important;
  }

  .fb-dock-divider {
    display: none;
  }

  .fb-dock {
    gap: 0.75rem;
    padding: 0.35rem 0.85rem;
  }

  .fb-dock-btn {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.1);
  }

  .fb-dock-btn svg {
    width: 18px;
    height: 18px;
  }

  .fb-page-indicator {
    font-size: 0.82rem;
  }

  .fb-page-input {
    width: 36px;
    font-size: 0.82rem;
  }
}

/* Extra Compact (< 360px) */
@media (max-width: 360px) {
  .fb-back-btn span {
    display: none; /* Show only icon on ultra small phones */
  }

  .fb-back-btn {
    padding: 0.35rem;
    width: 32px;
    height: 32px;
    justify-content: center;
  }

  .fb-title-badge {
    display: none;
  }

  .fb-actions {
    gap: 0.2rem;
  }

  .fb-btn-icon {
    width: 30px;
    height: 30px;
  }
}

/* Phone in Landscape Orientation (Max Height 480px) */
@media (max-height: 480px) and (orientation: landscape) {
  .fb-header {
    height: 42px;
  }

  .fb-footer {
    height: calc(44px + env(safe-area-inset-bottom, 0px));
  }

  .fb-stage {
    padding: 0.25rem 0.5rem;
  }

  .fb-btn-icon {
    width: 28px;
    height: 28px;
  }

  .fb-dock {
    padding: 0.2rem 0.6rem;
  }

  .fb-dock-btn {
    width: 30px;
    height: 30px;
  }

  .fb-swipe-hint {
    display: none !important;
  }
}