/* ============================================================
   AARAMBHX TECHNOLOGY — INTERACTIVE BROCHURE VIEWER STYLES
   Ultra-smooth 3D Flipbook, Apple Glassmorphism & High-DPI Canvas
   ============================================================ */

:root {
  --reader-bg: #0b0f19;
  --reader-surface: rgba(17, 24, 39, 0.75);
  --reader-surface-hover: rgba(31, 41, 55, 0.85);
  --reader-border: rgba(255, 255, 255, 0.12);
  --reader-border-focus: rgba(37, 99, 235, 0.5);
  --reader-text: #f9fafb;
  --reader-text-muted: #9ca3af;
  --reader-primary: #2563eb;
  --reader-primary-hover: #1d4ed8;
  --reader-primary-glow: rgba(37, 99, 235, 0.35);
  --reader-accent: #60a5fa;
  --reader-book-shadow: 0 25px 60px -15px rgba(0, 0, 0, 0.7), 0 0 40px rgba(37, 99, 235, 0.15);
  --reader-font: 'Plus Jakarta Sans', system-ui, -apple-system, sans-serif;
  --reader-mono: 'Space Grotesk', monospace;
}

[data-theme="light"], .light-theme {
  --reader-bg: #f1f5f9;
  --reader-surface: rgba(255, 255, 255, 0.85);
  --reader-surface-hover: rgba(248, 250, 252, 0.95);
  --reader-border: rgba(0, 0, 0, 0.1);
  --reader-border-focus: rgba(37, 99, 235, 0.4);
  --reader-text: #0f172a;
  --reader-text-muted: #64748b;
  --reader-primary: #2563eb;
  --reader-primary-hover: #1d4ed8;
  --reader-primary-glow: rgba(37, 99, 235, 0.2);
  --reader-accent: #2563eb;
  --reader-book-shadow: 0 20px 50px -10px rgba(15, 23, 42, 0.25), 0 0 30px rgba(37, 99, 235, 0.1);
}

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

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

/* Base App Wrapper */
.brochure-app {
  display: flex;
  flex-direction: column;
  width: 100vw;
  height: 100vh;
  height: 100dvh;
  position: relative;
  overflow: hidden;
  background: radial-gradient(circle at 50% 30%, rgba(37, 99, 235, 0.12) 0%, transparent 70%), var(--reader-bg);
  transition: background-color 0.3s ease;
}

/* ============================================================
   TOP FLOATING GLASS HEADER
   ============================================================ */
.reader-header {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.5rem;
  background: var(--reader-surface);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--reader-border);
  z-index: 100;
  transition: all 0.3s ease;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.45rem 0.85rem;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--reader-text);
  text-decoration: none;
  border-radius: 9999px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--reader-border);
  transition: all 0.2s ease;
}

.back-link:hover {
  background: var(--reader-primary);
  color: #ffffff;
  border-color: var(--reader-primary);
  transform: translateX(-2px);
}

.brand-meta {
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

.brand-logo-mini {
  width: 28px;
  height: 28px;
  object-fit: contain;
  border-radius: 6px;
}

.brochure-title-group {
  display: flex;
  flex-direction: column;
}

.brochure-title {
  font-size: 0.925rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--reader-text);
}

.brochure-subtitle {
  font-size: 0.72rem;
  color: var(--reader-text-muted);
  font-family: var(--reader-mono);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

/* Center indicator */
.header-center {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.page-indicator-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.35rem 0.95rem;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--reader-border);
  border-radius: 9999px;
  font-size: 0.825rem;
  font-weight: 500;
  font-family: var(--reader-mono);
  color: var(--reader-text);
}

.page-indicator-pill strong {
  color: var(--reader-accent);
  font-weight: 700;
}

/* Header actions */
.header-right {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.icon-action-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--reader-border);
  color: var(--reader-text);
  cursor: pointer;
  transition: all 0.2s ease;
}

.icon-action-btn:hover {
  background: var(--reader-surface-hover);
  border-color: var(--reader-border-focus);
  transform: scale(1.05);
}

.download-cta-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1.15rem;
  font-size: 0.875rem;
  font-weight: 700;
  color: #ffffff;
  background: linear-gradient(135deg, #2563eb, #1d4ed8);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 9999px;
  text-decoration: none;
  cursor: pointer;
  box-shadow: 0 4px 14px var(--reader-primary-glow);
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.download-cta-btn:hover {
  background: linear-gradient(135deg, #3b82f6, #2563eb);
  transform: translateY(-1px);
  box-shadow: 0 6px 20px var(--reader-primary-glow);
}

.download-cta-btn:active {
  transform: translateY(0);
}

.download-size-badge {
  font-size: 0.7rem;
  padding: 0.1rem 0.4rem;
  background: rgba(255, 255, 255, 0.25);
  border-radius: 9999px;
  font-weight: 600;
}

/* ============================================================
   MAIN FLIPBOOK STAGE
   ============================================================ */
.reader-stage {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 72px 2rem 80px 2rem;
  position: relative;
  overflow: hidden;
}

.book-canvas-wrap {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100%;
  max-width: 1400px;
  perspective: 2500px;
}

/* Flipbook Core Element */
.flip-book {
  box-shadow: var(--reader-book-shadow);
  border-radius: 4px;
  transition: opacity 0.3s ease, transform 0.3s ease;
  will-change: transform;
}

.flip-book .page {
  background-color: #ffffff;
  overflow: hidden;
  box-shadow: inset 0 0 30px rgba(0, 0, 0, 0.05);
}

.page-content {
  width: 100%;
  height: 100%;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background: #ffffff;
}

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

/* Hard Covers (Front & Back) */
.page[data-density="hard"] {
  background-color: #0b1120;
  box-shadow: 0 0 15px rgba(0, 0, 0, 0.4);
}

/* Spine Shadow Overlay in 2-page mode */
.flip-book .--left::after {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 35px;
  height: 100%;
  background: linear-gradient(to right, transparent, rgba(0, 0, 0, 0.15));
  pointer-events: none;
  z-index: 10;
}

.flip-book .--right::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 35px;
  height: 100%;
  background: linear-gradient(to left, transparent, rgba(0, 0, 0, 0.15));
  pointer-events: none;
  z-index: 10;
}

/* Side Navigation Arrows (Floating beside book) */
.side-nav-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: var(--reader-surface);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--reader-border);
  color: var(--reader-text);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 50;
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
}

.side-nav-btn:hover {
  background: var(--reader-primary);
  color: #ffffff;
  border-color: var(--reader-primary);
  transform: translateY(-50%) scale(1.1);
  box-shadow: 0 12px 30px var(--reader-primary-glow);
}

.side-nav-btn.prev-btn {
  left: 1rem;
}

.side-nav-btn.next-btn {
  right: 1rem;
}

.side-nav-btn:disabled,
.side-nav-btn[aria-disabled="true"] {
  opacity: 0.25;
  cursor: not-allowed;
  pointer-events: none;
}

/* ============================================================
   BOTTOM DOCK CONTROLS
   ============================================================ */
.reader-dock {
  position: absolute;
  bottom: 1.25rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 0.65rem;
  background: var(--reader-surface);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border: 1px solid var(--reader-border);
  border-radius: 9999px;
  z-index: 100;
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.3);
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.dock-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  height: 36px;
  min-width: 36px;
  padding: 0 0.65rem;
  border-radius: 9999px;
  background: transparent;
  border: none;
  color: var(--reader-text);
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
}

.dock-btn:hover {
  background: rgba(255, 255, 255, 0.1);
  color: var(--reader-accent);
}

.dock-btn.active {
  background: var(--reader-primary);
  color: #ffffff;
}

.dock-btn:disabled {
  opacity: 0.3;
  cursor: not-allowed;
}

.dock-divider {
  width: 1px;
  height: 20px;
  background: var(--reader-border);
  margin: 0 0.2rem;
}

/* ============================================================
   THUMBNAILS DRAWER
   ============================================================ */
.thumbnails-drawer {
  position: absolute;
  bottom: 74px;
  left: 50%;
  transform: translateX(-50%) translateY(30px);
  width: calc(100% - 3rem);
  max-width: 1020px;
  background: var(--reader-surface);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border: 1px solid var(--reader-border);
  border-radius: 16px;
  padding: 1rem;
  z-index: 90;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  box-shadow: 0 20px 45px rgba(0, 0, 0, 0.4);
}

.thumbnails-drawer.open {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

.thumbnails-track {
  display: flex;
  gap: 0.85rem;
  overflow-x: auto;
  padding-bottom: 0.5rem;
  scrollbar-width: thin;
  scrollbar-color: var(--reader-primary) transparent;
}

.thumbnails-track::-webkit-scrollbar {
  height: 6px;
}

.thumbnails-track::-webkit-scrollbar-thumb {
  background: var(--reader-border);
  border-radius: 3px;
}

.thumbnail-item {
  flex: 0 0 76px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.4rem;
  cursor: pointer;
  border-radius: 8px;
  padding: 4px;
  transition: all 0.2s ease;
}

.thumbnail-item img {
  width: 100%;
  height: 105px;
  object-fit: cover;
  border-radius: 4px;
  border: 1.5px solid transparent;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
  transition: all 0.2s ease;
}

.thumbnail-item span {
  font-size: 0.72rem;
  font-family: var(--reader-mono);
  color: var(--reader-text-muted);
}

.thumbnail-item:hover img {
  transform: translateY(-3px);
  border-color: var(--reader-accent);
}

.thumbnail-item.active img {
  border-color: var(--reader-primary);
  box-shadow: 0 0 12px var(--reader-primary-glow);
}

.thumbnail-item.active span {
  color: var(--reader-accent);
  font-weight: 700;
}

/* ============================================================
   LOADING OVERLAY
   ============================================================ */
.reader-loader {
  position: absolute;
  inset: 0;
  background: var(--reader-bg);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1.25rem;
  z-index: 200;
  transition: opacity 0.4s ease, visibility 0.4s ease;
}

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

.loader-spinner {
  width: 48px;
  height: 48px;
  border: 3px solid rgba(37, 99, 235, 0.2);
  border-top-color: var(--reader-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

.loader-text {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--reader-text);
  letter-spacing: -0.01em;
}

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

/* ============================================================
   RESPONSIVE DESIGN (Tablets & Mobile Phones)
   ============================================================ */
@media (max-width: 900px) {
  .side-nav-btn {
    width: 44px;
    height: 44px;
  }
  .side-nav-btn.prev-btn { left: 0.5rem; }
  .side-nav-btn.next-btn { right: 0.5rem; }
  .brochure-title { font-size: 0.85rem; }
  .brochure-subtitle { display: none; }
}

@media (max-width: 640px) {
  .reader-header {
    height: 56px;
    padding: 0 0.85rem;
  }
  .back-link span {
    display: none;
  }
  .download-cta-btn span {
    display: none;
  }
  .download-size-badge {
    display: none;
  }
  .download-cta-btn {
    padding: 0.5rem;
    width: 36px;
    height: 36px;
    justify-content: center;
  }
  .reader-stage {
    padding: 60px 0.5rem 72px 0.5rem;
  }
  .side-nav-btn {
    display: none; /* Rely on bottom dock and touch swipe on phones */
  }
  .reader-dock {
    bottom: 0.75rem;
    gap: 0.2rem;
    padding: 0.35rem 0.5rem;
  }
  .dock-btn span {
    display: none;
  }
  .thumbnails-drawer {
    bottom: 64px;
    width: calc(100% - 1.5rem);
    padding: 0.75rem;
  }
}