/* === FONT & THEME VARIABLES === */
:root {
  --bg-dark-blue: #0b0f19;       
  --bg-light-blue: #0f172a;
  --blob-1: rgba(139, 92, 246, 0.35);  
  --blob-2: rgba(56, 189, 248, 0.28); 
  --blob-3: rgba(99, 102, 241, 0.22); 
  
  --primary: #8b5cf6;        
  --secondary: #3b82f6;      
  --accent: #38bdf8;
  
  --success: #10b981;        
  --warning: #f59e0b;
  --text-dark: #f8fafc;
  --text-light: #94a3b8;
  --bg-card: rgba(30, 41, 59, 0.75);
  --bg-subtle: rgba(15, 23, 42, 0.65);
  --border: rgba(255, 255, 255, 0.1);
  --danger: #ef4444;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background-color: #0f172a;
  color: var(--text-dark);
  overflow-x: hidden;
  padding: 30px 20px;
  align-items: center;
}

/* === TOP BRAND BAR === */
.brand-top-bar {
  width: 100%;
  max-width: 1250px;
  margin: 0 auto 20px auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  z-index: 100;
}

.brand-back-btn {
  background: rgba(30, 41, 59, 0.65);
  backdrop-filter: blur(10px);
  padding: 8px 16px;
  border-radius: 12px;
  text-decoration: none;
  color: #cbd5e1;
  font-size: 14px;
  font-weight: 500;
  border: 1px solid rgba(255, 255, 255, 0.12);
  display: flex;
  align-items: center;
  gap: 8px;
  transition: all 0.25s ease;
}

.brand-back-btn:hover {
  background: rgba(51, 65, 85, 0.8);
  border-color: rgba(56, 189, 248, 0.4);
  color: white;
  transform: translateY(-2px);
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
}

.brand-badge {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 600;
  color: #94a3b8;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

.brand-badge img {
  height: 22px;
  width: auto;
}

/* === ANIMATED BACKGROUND === */
.background-wrapper {
  position: fixed; top: 0; left: 0; width: 100vw; height: 100vh;
  z-index: -1; overflow: hidden; pointer-events: none;
}
.blob-container { width: 100%; height: 100%; position: relative; filter: blur(80px); }
.blob { position: absolute; border-radius: 50%; animation: moveBlobs 10s ease-in-out infinite alternate; }
.blob:nth-child(1) { top: 5%; left: 5%; width: 450px; height: 450px; background: var(--blob-1); animation-delay: 0s; }
.blob:nth-child(2) { bottom: 5%; right: 5%; width: 500px; height: 500px; background: var(--blob-2); animation-delay: -5s; }
.blob:nth-child(3) { top: 40%; left: 35%; width: 380px; height: 380px; background: var(--blob-3); animation-delay: -2.5s; }

@keyframes moveBlobs {
  0% { transform: translate(0px, 0px) scale(1); }
  100% { transform: translate(35px, 50px) scale(1.1); }
}

/* === MAIN GLASSMORPHISM CARD === */
.card {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border);
  padding: 40px;
  border-radius: 24px;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.55);
  margin: auto; 
  width: 100%;
  z-index: 1;

  display: grid;
  grid-template-columns: 1fr 0fr; 
  gap: 0;
  max-width: 480px; 
  transition: max-width 0.8s cubic-bezier(0.16, 1, 0.3, 1), 
              grid-template-columns 0.8s cubic-bezier(0.16, 1, 0.3, 1), 
              gap 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.card.expanded {
  max-width: 1250px; 
  grid-template-columns: 350px 1fr; 
  gap: 40px;
}

.card-left {
  min-width: 0; 
  display: flex; flex-direction: column;
}

.header-section { display: flex; align-items: center; gap: 15px; margin-bottom: 15px; }
.pdf-logo-icon { font-size: 38px; color: var(--primary); filter: drop-shadow(0 4px 10px rgba(139, 92, 246, 0.4)); }
.header-section h2 { 
  margin: 0; 
  font-size: 28px; 
  background: linear-gradient(135deg, #c084fc 0%, #38bdf8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-weight: 800; 
  letter-spacing: -0.5px; 
  line-height: 1.1; 
}
p.subtitle { font-size: 14px; color: var(--text-light); line-height: 1.6; margin-bottom: 30px; }

/* Right Panel wrapper */
.card-right {
  min-width: 0; opacity: 0; overflow: hidden; 
  padding-left: 0; border-left: 2px dashed rgba(255, 255, 255, 0);
  transition: opacity 0.3s ease, padding-left 0.8s, border-color 0.8s;
}

.card-right-content {
  min-width: 360px; display: flex; flex-direction: column; height: 100%;
}

.card.expanded .card-right {
  opacity: 1; padding-left: 40px; border-left-color: rgba(255, 255, 255, 0.12);
  transition: opacity 0.6s ease 0.4s, padding-left 0.8s, border-color 0.8s;
}

/* === UPLOAD AREA === */
.upload-area {
  border: 2px dashed rgba(148, 163, 184, 0.35); border-radius: 18px;
  padding: 30px 20px; background-color: rgba(15, 23, 42, 0.35);
  transition: all 0.3s ease; cursor: pointer; position: relative; text-align: center;
}
.upload-area:hover { border-color: var(--accent); background-color: rgba(56, 189, 248, 0.08); transform: scale(1.01); }
.upload-label { font-weight: 700; color: var(--accent); font-size: 16px; display: block;}
.file-name { display: block; margin-top: 10px; font-size: 13px; color: var(--text-light); font-weight: 500; }

/* Drag Overlay */
body.drag-over-active::after {
  content: 'Drop Images Here'; position: fixed; top: 0; left: 0; width: 100%; height: 100%;
  background: rgba(15, 23, 42, 0.85); backdrop-filter: blur(12px); z-index: 4000;
  display: flex; align-items: center; justify-content: center; font-size: 30px; font-weight: 800;
  color: white; border: 4px dashed var(--accent);
}

/* === MASTER CONTROLS & TOGGLE SWITCH === */
.control-group { margin-bottom: 15px; }
.control-group label { display: block; font-size: 13px; font-weight: 600; color: #cbd5e1; margin-bottom: 6px; }
.control-group input, .control-group select {
  width: 100%; padding: 10px 12px; border: 1px solid var(--border); border-radius: 8px;
  background-color: var(--bg-subtle); color: var(--text-dark); font-family: inherit;
  font-size: 14px; outline: none; transition: border-color 0.2s ease, box-shadow 0.2s ease;
}
.control-group input:focus, .control-group select:focus { 
  border-color: var(--accent); 
  box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.2);
}
.input-row { display: flex; gap: 15px; }
.input-row .control-group { flex: 1; }
.size-control { display: flex; gap: 10px; transition: opacity 0.3s ease; }
.size-control select { width: 80px; flex-shrink: 0; }

/* Toggle Switch CSS */
.switch {
  position: relative;
  display: inline-block;
  width: 42px;
  height: 22px;
}
.switch input { opacity: 0; width: 0; height: 0; }
.slider {
  position: absolute; cursor: pointer;
  top: 0; left: 0; right: 0; bottom: 0;
  background-color: #475569;
  transition: .3s;
  border-radius: 22px;
}
.slider:before {
  position: absolute; content: "";
  height: 16px; width: 16px;
  left: 3px; bottom: 3px;
  background-color: white;
  transition: .3s;
  border-radius: 50%;
}
input:checked + .slider { background-color: var(--primary); }
input:checked + .slider:before { transform: translateX(20px); }

/* === BUTTONS & ACTIONS === */
.action-btn {
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  background-size: 200% 200%;
  color: white; border: none; padding: 13px 20px; font-size: 14px; border-radius: 12px;
  cursor: pointer; transition: all 0.3s ease; width: 100%;
  font-weight: 700; display: flex; align-items: center; justify-content: center; gap: 8px;
  box-shadow: 0 8px 20px -3px rgba(59, 130, 246, 0.35);
}
.action-btn:hover:not(:disabled) { 
  transform: translateY(-2px); 
  box-shadow: 0 10px 25px -3px rgba(59, 130, 246, 0.5); 
}
.action-btn:disabled { background: #334155; color: #64748b; cursor: not-allowed; box-shadow: none; transform: none; }

.secondary-btn:hover:not(:disabled) {
  background: rgba(51, 65, 85, 0.8) !important;
  color: var(--text-dark) !important;
  border-color: rgba(56, 189, 248, 0.4) !important;
  box-shadow: none !important;
}

/* Reverse Order Button */
#reverse-order-btn {
  background: var(--bg-subtle);
  color: #cbd5e1;
  border: 1px solid var(--border);
  padding: 6px 12px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 13px;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: all 0.2s;
}
#reverse-order-btn:hover {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
}

/* === PAGES GRID === */
.grid-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 15px; }
.grid-header h3 { font-size: 18px; color: var(--text-dark); margin: 0; }
.pages-count { background: var(--bg-subtle); padding: 6px 12px; border-radius: 20px; font-size: 13px; font-weight: 600; color: var(--accent); border: 1px solid var(--border); }

.pages-grid-container { max-height: calc(100vh - 180px); overflow-y: auto; padding-right: 15px; padding-bottom: 20px; }
.pages-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 20px; }

/* Scrollbar */
.pages-grid-container::-webkit-scrollbar { width: 6px; }
.pages-grid-container::-webkit-scrollbar-track { background: transparent; }
.pages-grid-container::-webkit-scrollbar-thumb { background-color: var(--border); border-radius: 10px; }

/* === IMAGE CARDS & ADD MORE CARD === */
.add-more-card {
  background-color: rgba(15, 23, 42, 0.35);
  border: 2px dashed rgba(148, 163, 184, 0.35);
  border-radius: 14px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  color: var(--accent);
  cursor: pointer;
  transition: all 0.25s ease;
  min-height: 220px;
}
.add-more-card:hover {
  background-color: rgba(56, 189, 248, 0.08);
  border-color: var(--accent);
  transform: translateY(-3px);
  box-shadow: 0 8px 20px rgba(0,0,0,0.3);
}
.add-more-card i { font-size: 2.2rem; }
.add-more-card span { font-weight: 700; font-size: 14px; }

.page-thumb { 
  background-color: rgba(15, 23, 42, 0.7); 
  border: 1px solid var(--border); 
  border-radius: 14px; 
  box-shadow: 0 4px 15px rgba(0,0,0,0.3); 
  display: flex; 
  flex-direction: column; 
  position: relative; 
  transition: all 0.2s;
  overflow: hidden;
}
.page-thumb:hover { 
  transform: translateY(-3px); 
  border-color: rgba(56, 189, 248, 0.4);
  box-shadow: 0 8px 25px rgba(0,0,0,0.4); 
}
.thumb-header { position: relative; border-bottom: 1px solid var(--border); width: 100%; overflow: hidden; background-color: var(--bg-subtle); aspect-ratio: var(--aspect-ratio, 1); transition: aspect-ratio 0.3s ease; }

.card-preview-img { width: 100%; height: 100%; object-fit: cover; display: block; transition: filter 0.3s ease; }

/* Image Number Badge */
.card-number-badge {
  position: absolute;
  top: 10px;
  left: 10px;
  background: var(--primary);
  color: white;
  font-weight: 700;
  font-size: 12px;
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  z-index: 2;
  box-shadow: 0 2px 4px rgba(0,0,0,0.3);
}

/* Processing State */
.image-card.processing .card-preview-img { filter: blur(5px) brightness(0.8); }
.card-processing-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease;
  z-index: 5;
}
.image-card.processing .card-processing-overlay {
  opacity: 1;
  visibility: visible;
}
.card-processing-overlay i {
  font-size: 2.5rem;
  color: white;
  filter: drop-shadow(0 2px 4px rgba(0,0,0,0.4));
}
.image-card.processing .thumb-actions { opacity: 0.5; pointer-events: none; }

.card-status-indicator { position: absolute; top: 10px; right: 10px; width: 12px; height: 12px; border-radius: 50%; background-color: var(--text-light); border: 2px solid #0f172a; z-index: 2; box-shadow: 0 2px 4px rgba(0,0,0,0.3);}
.image-card[data-status="processed"] .card-status-indicator { background-color: var(--success); }
.image-card[data-status="error"] .card-status-indicator { background-color: var(--danger); }

.thumb-body { padding: 12px; }
.thumb-actions { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; transition: opacity 0.3s ease; }
.thumb-btn { background: rgba(30, 41, 59, 0.8); color: var(--text-light); border: 1px solid var(--border); border-radius: 8px; padding: 10px 0; font-size: 14px; cursor: pointer; transition: all 0.2s; display: flex; align-items: center; justify-content: center;}
.thumb-btn:hover:not(:disabled) { background-color: var(--primary); color: white; border-color: var(--primary); }
.thumb-btn:disabled { opacity: 0.4; cursor: not-allowed; }

/* === MODALS & LOADER === */
.modal-overlay { position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: rgba(0, 0, 0, 0.7); backdrop-filter: blur(8px); display: flex; align-items: center; justify-content: center; z-index: 1200; opacity: 1; transition: opacity 0.3s ease;}
.modal-overlay.hidden { opacity: 0; pointer-events: none; }

.loader-content { background: var(--bg-card); border: 1px solid var(--border); padding: 30px 40px; border-radius: 18px; text-align: center; box-shadow: 0 20px 40px rgba(0,0,0,0.5);}
.loader-content i { font-size: 40px; color: var(--accent); margin-bottom: 15px; }
.loader-content p { font-size: 16px; font-weight: 600; color: var(--text-dark);}

/* Preview Modal */
.preview-modal-container { width: 90vw; max-width: 1000px; height: 85vh; display: flex; flex-direction: column; background-color: #1e293b; border: 1px solid var(--border); border-radius: 20px; box-shadow: 0 25px 50px rgba(0,0,0,0.6); overflow: hidden; transform: scale(1); transition: transform 0.3s ease; }
.modal-overlay.hidden .preview-modal-container { transform: scale(0.95); }

.preview-modal-header { padding: 15px 25px; flex-shrink: 0; display: flex; justify-content: space-between; align-items: center; border-bottom: 1px solid var(--border); background: rgba(15, 23, 42, 0.8); }
.mode-toggle { display: flex; background-color: rgba(15, 23, 42, 0.6); border-radius: 8px; padding: 4px; border: 1px solid var(--border); }
.mode-btn { padding: 8px 20px; border: none; background-color: transparent; color: var(--text-light); font-weight: 600; border-radius: 6px; cursor: pointer; transition: all 0.2s; font-size: 13px;}
.mode-btn.active { background-color: var(--primary); color: #fff; box-shadow: 0 2px 5px rgba(0,0,0,0.2); }
.close-btn { background: none; border: none; font-size: 28px; color: var(--text-light); cursor: pointer; transition: 0.2s; }
.close-btn:hover { color: var(--danger); transform: rotate(90deg); }

.preview-modal-body { flex-grow: 1; overflow: hidden; display: flex; align-items: center; justify-content: center; background-color: #0f172a; padding: 20px; }
.preview-modal-footer { padding: 15px 25px; border-top: 1px solid var(--border); display: flex; justify-content: flex-end; background: rgba(15, 23, 42, 0.8);}

.preview-nav-btn { position: absolute; top: 50%; transform: translateY(-50%); background-color: rgba(15, 23, 42, 0.7); color: white; border: 1px solid var(--border); border-radius: 50%; width: 50px; height: 50px; display: flex; align-items: center; justify-content: center; cursor: pointer; transition: 0.2s; z-index: 5; font-size: 20px;}
.preview-nav-btn:hover:not(:disabled) { background-color: var(--primary); transform: translateY(-50%) scale(1.1); border-color: var(--primary); }
#preview-prev-btn { left: 20px; }
#preview-next-btn { right: 20px; }
.preview-nav-btn:disabled { opacity: 0.2; cursor: not-allowed; }

/* Custom Cropper Styles */
.crop-container { position: relative; user-select: none; line-height: 0; transition: width 0.2s ease, height 0.2s ease; }
.crop-container.no-transition { transition: none; }
#preview-modal-image { display: block; width: 100%; height: 100%; pointer-events: none; }
.crop-selection { position: absolute; display: none; cursor: move; outline: 2px solid var(--accent); box-shadow: 0 0 0 9999px rgba(0, 0, 0, 0.65); }
.grid-lines, .grid-lines-inner { position: absolute; inset: 0; }
.grid-lines::before, .grid-lines::after, .grid-lines-inner::before, .grid-lines-inner::after { content: ''; position: absolute; background: rgba(255, 255, 255, 0.5); }
.grid-lines::before { top: 33.33%; left: 0; width: 100%; height: 1px; }
.grid-lines::after { top: 66.66%; left: 0; width: 100%; height: 1px; }
.grid-lines-inner::before { left: 33.33%; top: 0; height: 100%; width: 1px; }
.grid-lines-inner::after { left: 66.66%; top: 0; height: 100%; width: 1px; }

.handle { position: absolute; width: 16px; height: 16px; border: 3px solid var(--accent); z-index: 10; background: #0f172a;}
.nw { top: -8px; left: -8px; cursor: nw-resize;}
.ne { top: -8px; right: -8px; cursor: ne-resize;}
.sw { bottom: -8px; left: -8px; cursor: sw-resize;}
.se { bottom: -8px; right: -8px; cursor: se-resize;}

.handle-m { position: absolute; background: var(--accent); z-index: 10; }
.n { top: -3px; left: 50%; transform: translateX(-50%); width: 24px; height: 6px; cursor: n-resize; }
.s { bottom: -3px; left: 50%; transform: translateX(-50%); width: 24px; height: 6px; cursor: s-resize; }
.e { right: -3px; top: 50%; transform: translateY(-50%); width: 6px; height: 24px; cursor: e-resize; }
.w { left: -3px; top: 50%; transform: translateY(-50%); width: 6px; height: 24px; cursor: w-resize; }

/* Custom Context Menu */
#custom-context-menu { position: fixed; z-index: 5000; background-color: var(--bg-card); border: 1px solid var(--border); border-radius: 12px; box-shadow: 0 10px 25px rgba(0,0,0,0.5); padding: 8px; display: none; }
#paste-context-btn { display: flex; align-items: center; gap: 10px; background: none; border: none; color: var(--text-dark); padding: 8px 12px; width: 100%; text-align: left; border-radius: 8px; cursor: pointer; font-size: 14px; }
#paste-context-btn:hover { background-color: var(--bg-subtle); color: var(--accent); }

/* === RESPONSIVE === */
@media (max-width: 900px) {
  .card { grid-template-columns: 1fr; grid-template-rows: auto 0fr; max-width: 500px; padding: 30px 20px; transition: grid-template-rows 0.8s cubic-bezier(0.16, 1, 0.3, 1), gap 0.8s; }
  .card.expanded { max-width: 650px; grid-template-columns: 1fr; grid-template-rows: auto 1fr; gap: 25px; }
  .card-right { border-left: none; padding-left: 0; border-top: 2px dashed rgba(255, 255, 255, 0); }
  .card.expanded .card-right { padding-left: 0; padding-top: 25px; border-left: none; border-top-color: var(--border); }
  .pages-grid-container { max-height: 50vh; }
  .header-section { justify-content: center; }
  .card-left { text-align: center; }
  .preview-nav-btn { width: 40px; height: 40px; font-size: 16px;}
  #preview-prev-btn { left: 5px; }
  #preview-next-btn { right: 5px; }
}
@media (max-width: 480px) {
  body { padding: 20px 10px; }
  .card { padding: 25px 15px; border-radius: 16px; }
  .pages-grid { grid-template-columns: repeat(2, 1fr); gap: 10px; }
  .thumb-btn { font-size: 12px; padding: 8px 0; }
  .input-row { flex-direction: column; gap: 0; }
}