/**
 * My PDF Viewer - Modern Styles
 * Version: 2.1.0
 * Mode: Single Page View
 */

/* CSS Variables for theming */
:root {
  --pdf-primary: #3b82f6;
  --pdf-primary-hover: #2563eb;
  --pdf-primary-light: rgba(59, 130, 246, 0.1);
  --pdf-success: #10b981;
  --pdf-error: #ef4444;
  --pdf-warning: #f59e0b;
  
  /* Light theme (default) */
  --pdf-bg: #1e293b;
  --pdf-surface: #ffffff;
  --pdf-surface-elevated: #ffffff;
  --pdf-border: #334155;
  --pdf-text: #f1f5f9;
  --pdf-text-secondary: #94a3b8;
  --pdf-text-muted: #64748b;
  --pdf-toolbar-bg: rgba(30, 41, 59, 0.98);
  --pdf-toolbar-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
  --pdf-page-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.3);
  --pdf-btn-hover: rgba(255, 255, 255, 0.1);
  --pdf-overlay: rgba(0, 0, 0, 0.7);
  --pdf-scrollbar: #475569;
  --pdf-scrollbar-hover: #64748b;
  --pdf-sidebar-bg: #0f172a;
}

/* Dark theme */
.pdf-viewer.pdf-theme-dark,
.pdf-theme-dark {
  --pdf-bg: #0f172a;
  --pdf-surface: #1e293b;
  --pdf-surface-elevated: #334155;
  --pdf-border: #334155;
  --pdf-text: #f1f5f9;
  --pdf-text-secondary: #94a3b8;
  --pdf-text-muted: #64748b;
  --pdf-toolbar-bg: rgba(15, 23, 42, 0.98);
  --pdf-sidebar-bg: #020617;
}

/* Light theme */
.pdf-viewer.pdf-theme-light,
.pdf-theme-light {
  --pdf-bg: #e2e8f0;
  --pdf-surface: #ffffff;
  --pdf-toolbar-bg: rgba(255, 255, 255, 0.98);
  --pdf-toolbar-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --pdf-text: #1e293b;
  --pdf-text-secondary: #475569;
  --pdf-border: #cbd5e1;
  --pdf-btn-hover: rgba(0, 0, 0, 0.05);
  --pdf-sidebar-bg: #f1f5f9;
  --pdf-scrollbar: #cbd5e1;
}

/* ========================================
   Base Container
   ======================================== */
.pdf-viewer {
  position: relative;
  width: 100%;
  height: 600px;
  min-height: 400px;
  max-height: 90vh;
  background: var(--pdf-bg);
  border-radius: 12px;
  overflow: hidden;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  font-size: 14px;
  line-height: 1.5;
  color: var(--pdf-text);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
  outline: none;
}

.pdf-viewer * {
  box-sizing: border-box;
}

.pdf-viewer.pdf-viewer-fullscreen {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  width: 100vw;
  height: 100vh;
  max-height: 100vh;
  z-index: 999999;
  border-radius: 0;
}

/* ========================================
   Content Wrapper
   ======================================== */
.pdf-content-wrapper {
  position: relative;
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
}

/* ========================================
   Progress Bar
   ======================================== */
.pdf-progress {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--pdf-border);
  z-index: 100;
  overflow: hidden;
}

.pdf-progress-bar {
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--pdf-primary), var(--pdf-primary-hover));
  transition: width 0.3s ease;
  border-radius: 0 3px 3px 0;
}

/* ========================================
   Loader
   ======================================== */
.pdf-loader {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  z-index: 50;
}

.pdf-loader-spinner {
  width: 48px;
  height: 48px;
  color: var(--pdf-primary);
}

.pdf-loader-spinner svg {
  width: 100%;
  height: 100%;
  animation: spin 1s linear infinite;
}

.pdf-loader-text {
  margin: 0;
  color: var(--pdf-text-secondary);
  font-size: 14px;
}

@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

/* ========================================
   Toolbar
   ======================================== */
.pdf-toolbar {
  display: none;
  position: relative;
  z-index: 100;
  background: var(--pdf-toolbar-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--pdf-border);
  padding: 10px 16px;
  gap: 8px;
  align-items: center;
  justify-content: space-between;
  box-shadow: var(--pdf-toolbar-shadow);
  flex-shrink: 0;
}

.pdf-toolbar-group {
  display: flex;
  align-items: center;
  gap: 4px;
}

.pdf-toolbar-center {
  flex: 1;
  justify-content: center;
}

.pdf-toolbar-separator {
  width: 1px;
  height: 24px;
  background: var(--pdf-border);
  margin: 0 8px;
}

/* Buttons */
.pdf-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  padding: 0;
  border: none;
  background: transparent;
  color: var(--pdf-text);
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.15s ease;
}

.pdf-btn:hover:not(:disabled) {
  background: var(--pdf-btn-hover);
  color: var(--pdf-primary);
}

.pdf-btn:active:not(:disabled) {
  transform: scale(0.95);
}

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

.pdf-btn svg {
  width: 20px;
  height: 20px;
}

/* Page Info */
.pdf-page-info {
  font-size: 14px;
  font-weight: 500;
  color: var(--pdf-text);
  min-width: 70px;
  text-align: center;
  white-space: nowrap;
  padding: 0 8px;
}

/* Zoom Level */
.pdf-zoom-level {
  font-size: 13px;
  color: var(--pdf-text-secondary);
  min-width: 50px;
  text-align: center;
  font-variant-numeric: tabular-nums;
}

/* ========================================
   Page Wrapper (Single Page Mode)
   ======================================== */
.pdf-page-wrapper {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: auto;
  padding: 20px;
  background: var(--pdf-bg);
  transition: margin-left 0.3s ease;
}

.pdf-page-wrapper.with-sidebar {
  margin-left: 180px;
}

/* Page Container */
.pdf-page-container {
  background: var(--pdf-surface);
  border-radius: 4px;
  overflow: hidden;
  box-shadow: var(--pdf-page-shadow);
  line-height: 0;
}

.pdf-page-container canvas {
  display: block;
  max-width: 100%;
  height: auto;
}

/* Custom Scrollbar */
.pdf-page-wrapper::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

.pdf-page-wrapper::-webkit-scrollbar-track {
  background: transparent;
}

.pdf-page-wrapper::-webkit-scrollbar-thumb {
  background: var(--pdf-scrollbar);
  border-radius: 5px;
  border: 2px solid transparent;
  background-clip: padding-box;
}

.pdf-page-wrapper::-webkit-scrollbar-thumb:hover {
  background: var(--pdf-scrollbar-hover);
  border: 2px solid transparent;
  background-clip: padding-box;
}

/* ========================================
   Thumbnails Sidebar
   ======================================== */
.pdf-thumbnails-sidebar {
  position: absolute;
  top: 57px;
  left: 0;
  bottom: 0;
  width: 180px;
  background: var(--pdf-sidebar-bg);
  border-right: 1px solid var(--pdf-border);
  overflow-y: auto;
  transform: translateX(-100%);
  transition: transform 0.3s ease;
  z-index: 90;
}

.pdf-thumbnails-sidebar.visible {
  transform: translateX(0);
}

.pdf-thumbnails-container {
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.pdf-thumbnail-wrapper {
  cursor: pointer;
  border-radius: 6px;
  overflow: hidden;
  border: 2px solid transparent;
  transition: all 0.15s ease;
  background: var(--pdf-surface);
}

.pdf-thumbnail-wrapper:hover {
  border-color: var(--pdf-primary-light);
  transform: scale(1.02);
}

.pdf-thumbnail-wrapper.active {
  border-color: var(--pdf-primary);
  box-shadow: 0 0 0 3px var(--pdf-primary-light);
}

.pdf-thumbnail-placeholder {
  width: 100%;
  aspect-ratio: 0.707;
  background: var(--pdf-border);
  animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

.pdf-thumbnail-canvas {
  width: 100%;
  height: auto;
  display: block;
}

.pdf-thumbnail-label {
  display: block;
  padding: 4px 8px;
  text-align: center;
  font-size: 12px;
  font-weight: 500;
  color: var(--pdf-text-secondary);
  background: var(--pdf-surface);
}

.pdf-thumbnail-wrapper.active .pdf-thumbnail-label {
  color: var(--pdf-primary);
  background: var(--pdf-primary-light);
}

/* Thumbnails Scrollbar */
.pdf-thumbnails-sidebar::-webkit-scrollbar {
  width: 6px;
}

.pdf-thumbnails-sidebar::-webkit-scrollbar-track {
  background: transparent;
}

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

/* ========================================
   Error State
   ======================================== */
.pdf-error {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  padding: 32px;
  text-align: center;
  max-width: 400px;
}

.pdf-error-icon {
  width: 64px;
  height: 64px;
  color: var(--pdf-error);
}

.pdf-error-icon svg {
  width: 100%;
  height: 100%;
}

.pdf-error-message {
  margin: 0;
  color: var(--pdf-text);
  font-size: 16px;
}

.pdf-viewer-error {
  padding: 20px;
  margin: 10px 0;
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid var(--pdf-error);
  border-radius: 8px;
  color: var(--pdf-error);
  text-align: center;
}

/* ========================================
   Responsive Design
   ======================================== */
@media (max-width: 768px) {
  .pdf-viewer {
    height: 500px;
    min-height: 350px;
    border-radius: 8px;
  }

  .pdf-toolbar {
    padding: 8px 12px;
    flex-wrap: wrap;
  }

  .pdf-toolbar-group {
    gap: 2px;
  }

  .pdf-toolbar-separator {
    display: none;
  }

  .pdf-toolbar-left {
    order: 1;
  }
  
  .pdf-toolbar-center {
    order: 2;
    width: 100%;
    justify-content: center;
    padding-top: 8px;
  }

  .pdf-toolbar-right {
    order: 1;
  }

  .pdf-btn {
    width: 32px;
    height: 32px;
  }

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

  .pdf-page-info {
    font-size: 13px;
  }

  .pdf-zoom-level {
    display: none;
  }

  .pdf-page-wrapper {
    padding: 12px;
  }

  .pdf-page-wrapper.with-sidebar {
    margin-left: 0;
  }

  .pdf-thumbnails-sidebar {
    width: 120px;
    top: 90px;
  }

  /* Hide some buttons on mobile */
  .pdf-btn-rotate,
  .pdf-btn-print,
  .pdf-btn-fit-width {
    display: none;
  }
}

@media (max-width: 480px) {
  .pdf-viewer {
    height: 450px;
    min-height: 300px;
  }

  .pdf-toolbar {
    padding: 6px 8px;
  }

  .pdf-btn {
    width: 28px;
    height: 28px;
  }

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

  .pdf-page-wrapper {
    padding: 8px;
  }

  .pdf-thumbnails-sidebar {
    width: 100px;
  }
}

/* ========================================
   Print Styles
   ======================================== */
@media print {
  .pdf-viewer {
    height: auto;
    max-height: none;
    box-shadow: none;
  }

  .pdf-toolbar,
  .pdf-thumbnails-sidebar,
  .pdf-progress,
  .pdf-loader {
    display: none !important;
  }

  .pdf-page-wrapper {
    padding: 0;
    overflow: visible;
  }

  .pdf-page-container {
    box-shadow: none;
  }
}

/* ========================================
   High Contrast Mode
   ======================================== */
@media (prefers-contrast: high) {
  .pdf-viewer {
    border: 2px solid var(--pdf-text);
  }

  .pdf-btn {
    border: 1px solid var(--pdf-text);
  }

  .pdf-page-container {
    border: 1px solid var(--pdf-text);
  }
}

/* ========================================
   Reduced Motion
   ======================================== */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* ========================================
   Focus Styles for Accessibility
   ======================================== */
.pdf-btn:focus-visible {
  outline: 2px solid var(--pdf-primary);
  outline-offset: 2px;
}

.pdf-thumbnail-wrapper:focus-visible {
  outline: 2px solid var(--pdf-primary);
  outline-offset: 2px;
}

.pdf-viewer:focus {
  outline: none;
}

.pdf-viewer:focus-visible {
  box-shadow: 0 0 0 3px var(--pdf-primary-light), 0 4px 20px rgba(0, 0, 0, 0.15);
}