/* ==========================================================================
   Flat Design Corporativo - Batch Print
   Design System based on design.md
   ========================================================================== */

/* Font Aliases for Thai Word Documents */
@font-face {
  font-family: 'TH Sarabun New';
  src: local('TH Sarabun New'), local('THSarabunNew'), local('Sarabun');
}
@font-face {
  font-family: 'TH Sarabun PSK';
  src: local('TH Sarabun PSK'), local('THSarabunPSK'), local('TH Sarabun New'), local('Sarabun');
}

:root {
  /* Colors */
  --color-primary: #007BFF;
  --color-primary-dark: #0069D9;
  --color-primary-light: #E7F1FF;
  --color-secondary: #343A40;
  --color-text-main: #212529;
  --color-text-muted: #6C757D;
  --color-border: #DEE2E6;
  --color-border-light: #E9ECEF;
  --color-bg-neutral: #F8F9FA;
  --color-surface: #FFFFFF;

  /* Semantics */
  --color-success: #28A745;
  --color-success-bg: #E8F5E9;
  --color-success-text: #1B5E20;
  --color-warning: #FFC107;
  --color-warning-bg: #FFF9C4;
  --color-warning-text: #B78103;
  --color-danger: #DC3545;
  --color-danger-bg: #FFEBEE;
  --color-danger-text: #C62828;
  --color-info: #17A2B8;

  /* Typography */
  --font-family-base: 'Lato', 'Noto Sans Thai', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-family-doc: 'TH Sarabun New', 'TH Sarabun PSK', 'Sarabun', 'Angsana New', 'Cordia New', Tahoma, sans-serif;
  --font-family-mono: 'JetBrains Mono', monospace;

  /* Corner Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;

  /* Elevation */
  --shadow-subtle: 0 2px 8px rgba(0, 0, 0, 0.06);
  --shadow-card: 0 2px 12px rgba(0, 0, 0, 0.06);
  --shadow-lift: 0 4px 12px rgba(0, 0, 0, 0.08);

  /* Transitions */
  --transition-fast: 0.15s ease-out;
  --transition-smooth: 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

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

body {
  margin: 0;
  font-family: var(--font-family-base);
  font-size: 1rem;
  line-height: 1.6;
  background-color: var(--color-bg-neutral);
  color: var(--color-text-main);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ==========================================================================
   Header Bar
   ========================================================================== */
.bar {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 0 24px;
  height: 64px;
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--color-secondary);
}

.brand-img {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  object-fit: contain;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
  border: 1px solid var(--color-border-light);
  flex-shrink: 0;
}

.brand-text {
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.bar h1 {
  font-size: 1.25rem;
  font-weight: 700;
  margin: 0;
  color: var(--color-secondary);
  letter-spacing: -0.02em;
}

.bar-subtitle {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  font-weight: 400;
  padding-left: 10px;
  border-left: 1px solid var(--color-border);
}

.spacer {
  flex: 1;
}

.actions-group {
  display: flex;
  align-items: center;
  gap: 10px;
}

/* ==========================================================================
   Language Selector Dropdown
   ========================================================================== */
.lang-dropdown {
  position: relative;
}

.lang-btn {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 6px 12px;
  font-size: 0.8125rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  background-color: var(--color-bg-neutral);
  border: 1.5px solid var(--color-border);
  color: var(--color-secondary);
  transition: all 0.2s ease;
  cursor: pointer;
}

.lang-btn:hover {
  background-color: #FFFFFF;
  border-color: var(--color-primary);
  color: var(--color-primary);
  box-shadow: 0 2px 6px rgba(13, 110, 253, 0.12);
}

.lang-current-label {
  font-weight: 600;
  font-size: 0.8125rem;
  letter-spacing: -0.01em;
}

.lang-arrow {
  color: var(--color-text-muted);
  transition: transform 0.2s ease;
}

.lang-dropdown.open .lang-arrow {
  transform: rotate(180deg);
}

.lang-menu {
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  min-width: 154px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: 0 10px 25px -5px rgba(15, 23, 42, 0.18), 0 0 0 1px rgba(0, 0, 0, 0.05);
  padding: 6px;
  display: flex;
  flex-direction: column;
  gap: 2px;
  z-index: 200;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-6px) scale(0.97);
  transition: all 0.18s cubic-bezier(0.16, 1, 0.3, 1);
}

.lang-dropdown.open .lang-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0) scale(1);
}

.lang-item {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 8px 12px;
  border: none;
  background: transparent;
  border-radius: var(--radius-sm);
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--color-text-main);
  cursor: pointer;
  text-align: left;
  transition: all 0.15s ease;
}

.lang-item:hover {
  background-color: var(--color-bg-neutral);
  color: var(--color-primary);
}

.lang-item.active {
  background-color: var(--color-primary-light);
  color: var(--color-primary);
  font-weight: 600;
}

.lang-flag {
  font-size: 1rem;
  line-height: 1;
}

.lang-name {
  flex: 1;
}

.lang-check {
  color: var(--color-primary);
  opacity: 0;
  transition: opacity 0.15s ease;
}

.lang-item.active .lang-check {
  opacity: 1;
}

/* ==========================================================================
   Site Footer (OleLab Link, Keyboard Shortcuts, Privacy Info)
   ========================================================================== */
.site-footer {
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-border);
  height: 42px;
  display: flex;
  align-items: center;
  z-index: 50;
  position: relative;
  flex-shrink: 0;
}

.footer-inner {
  width: 100%;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.footer-col-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

.footer-app-name {
  font-weight: 700;
  color: var(--color-secondary);
  letter-spacing: -0.01em;
}

.footer-sep {
  color: var(--color-border);
}

.footer-creator {
  color: var(--color-text-muted);
}

.footer-brand-link {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 2px 9px;
  border-radius: var(--radius-sm);
  background: rgba(13, 110, 253, 0.08);
  border: 1px solid rgba(13, 110, 253, 0.2);
  color: var(--color-primary);
  text-decoration: none;
  font-weight: 700;
  font-size: 0.8125rem;
  transition: all 0.2s ease;
}

.footer-brand-link:hover {
  background-color: var(--color-primary);
  color: #FFFFFF;
  border-color: var(--color-primary);
  transform: translateY(-1px);
  box-shadow: 0 2px 6px rgba(13, 110, 253, 0.25);
}

.footer-link-icon {
  flex-shrink: 0;
  transition: transform 0.2s ease;
}

.footer-brand-link:hover .footer-link-icon {
  transform: translate(1px, -1px);
}

.footer-col-shortcuts {
  display: flex;
  align-items: center;
}

.shortcut-tip {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  background: var(--color-bg-neutral);
  padding: 4px 12px;
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-sm);
  font-family: var(--font-family-mono);
}

.shortcut-tip kbd {
  background: #FFFFFF;
  border: 1px solid var(--color-border);
  border-radius: 3px;
  padding: 1px 5px;
  font-size: 0.7188rem;
  color: var(--color-secondary);
  font-weight: 600;
  box-shadow: 0 1px 1px rgba(0, 0, 0, 0.05);
}

.footer-col-privacy {
  display: flex;
  align-items: center;
}

.footer-privacy-text {
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

/* ==========================================================================
   Buttons
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 9px 18px;
  font-family: var(--font-family-base);
  font-size: 0.875rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  background-color: var(--color-primary);
  color: #FFFFFF;
  transition: background-color var(--transition-fast),
              box-shadow var(--transition-fast),
              transform var(--transition-fast);
  user-select: none;
  text-decoration: none;
  white-space: nowrap;
}

.btn svg {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

.btn:hover:not(:disabled) {
  background-color: var(--color-primary-dark);
  box-shadow: var(--shadow-subtle);
  transform: translateY(-1px);
}

.btn:active:not(:disabled) {
  transform: translateY(1px);
  box-shadow: none;
}

.btn:disabled {
  background-color: #CBD5E1;
  color: #F8FAFC;
  cursor: not-allowed;
  border-color: transparent;
  box-shadow: none;
  transform: none;
}

.btn.ghost {
  background-color: transparent;
  color: var(--color-secondary);
  border: 1.5px solid var(--color-border);
}

.btn.ghost:hover:not(:disabled) {
  background-color: var(--color-bg-neutral);
  border-color: #CED4DA;
  color: var(--color-text-main);
}

.btn.ghost:active:not(:disabled) {
  background-color: var(--color-border-light);
}

.btn.sm {
  padding: 6px 12px;
  font-size: 0.8125rem;
}

/* ==========================================================================
   App Layout
   ========================================================================== */
.app {
  display: grid;
  grid-template-columns: 400px 1fr;
  height: calc(100vh - 64px - 49px - 42px);
  overflow: hidden;
}

/* Fullscreen Desktop View Mode States */
body.view-files .app {
  display: flex;
  justify-content: center;
  height: calc(100vh - 64px - 49px - 42px);
  overflow-y: auto;
  background-color: var(--color-bg-neutral);
  padding: 24px 16px;
}

body.view-files .side {
  width: 100%;
  max-width: 900px;
  margin: 0 auto;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-card);
  height: auto;
  max-height: none;
}

body.view-files ul#list {
  flex-shrink: 0;
  max-height: none;
  min-height: fit-content;
  overflow: visible;
}

body.view-files .main {
  display: none !important;
}

body.view-preview .app {
  display: block;
  height: calc(100vh - 64px - 49px);
  overflow-y: auto;
}

body.view-preview .side {
  display: none !important;
}

body.view-preview .main {
  display: flex;
  flex-direction: column;
  width: 100%;
}

/* ==========================================================================
   Sidebar
   ========================================================================== */
.side {
  background-color: var(--color-surface);
  border-right: 1px solid var(--color-border);
  overflow-y: auto;
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* Drop Zone */
#drop {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 28px 16px;
  border: 2px dashed #CED4DA;
  border-radius: var(--radius-sm);
  background-color: var(--color-bg-neutral);
  color: var(--color-text-muted);
  cursor: pointer;
  transition: all var(--transition-fast);
  text-align: center;
}

#drop svg {
  width: 32px;
  height: 32px;
  color: var(--color-primary);
  opacity: 0.8;
  transition: transform var(--transition-smooth);
}

#drop:hover {
  border-color: var(--color-primary);
  background-color: var(--color-primary-light);
  color: var(--color-primary-dark);
}

#drop:hover svg {
  transform: translateY(-2px);
  opacity: 1;
}

#drop.over {
  border-color: var(--color-primary);
  background-color: var(--color-primary-light);
  color: var(--color-primary);
}

.drop-title {
  font-weight: 600;
  font-size: 0.9375rem;
  color: var(--color-secondary);
}

.drop-hint {
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

/* List Controls */
.list-controls {
  display: flex;
  gap: 8px;
}

/* File List */
ul#list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
  flex-shrink: 0;
  max-height: 320px;
  overflow-y: auto;
}

ul#list:not(:empty) {
  min-height: 48px;
}

ul#list li {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
}

ul#list li:hover {
  border-color: #CED4DA;
  background-color: #FAFAFB;
}

li.ghost {
  opacity: 0.35;
  background: var(--color-primary-light) !important;
  border: 1px dashed var(--color-primary) !important;
}

li.chosen {
  box-shadow: var(--shadow-lift);
  border-color: var(--color-primary);
}

.handle {
  cursor: grab;
  color: #6C757D;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 4px 6px;
  margin: -2px 0 -2px -4px;
  border-radius: var(--radius-sm);
  user-select: none;
  touch-action: none;
  transition: all var(--transition-fast);
}

.handle:hover {
  color: var(--color-primary);
  background-color: var(--color-primary-light);
}

.handle:active {
  cursor: grabbing;
  color: var(--color-primary-dark);
  background-color: #D0E3FF;
}

.file-check {
  appearance: none;
  -webkit-appearance: none;
  width: 17px;
  height: 17px;
  border: 1.5px solid #ADB5BD;
  border-radius: var(--radius-sm);
  background-color: #FFFFFF;
  cursor: pointer;
  display: grid;
  place-content: center;
  margin: 0;
  transition: all var(--transition-fast);
}

.file-check:checked {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
}

.file-check:checked::before {
  content: "";
  width: 9px;
  height: 5px;
  border-left: 2px solid #FFFFFF;
  border-bottom: 2px solid #FFFFFF;
  transform: rotate(-45deg) translate(1px, -1px);
}

.file-check:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.fname {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-main);
}

.meta {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  font-family: var(--font-family-mono);
  white-space: nowrap;
}

.chip {
  font-size: 0.6875rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  white-space: nowrap;
  letter-spacing: 0.02em;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.chip.ok {
  background: var(--color-success-bg);
  color: var(--color-success-text);
}

.chip.load {
  background: var(--color-warning-bg);
  color: var(--color-warning-text);
}

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

.spin {
  animation: spin 1s linear infinite;
}

.chip.err {
  background: var(--color-danger-bg);
  color: var(--color-danger-text);
}

.del {
  border: 0;
  background: transparent;
  cursor: pointer;
  color: #ADB5BD;
  padding: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

.del:hover {
  color: var(--color-danger);
  background-color: var(--color-danger-bg);
}

/* ==========================================================================
   Settings Fieldset
   ========================================================================== */
fieldset {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 16px;
  margin: 0;
  background-color: var(--color-surface);
}

legend {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-secondary);
  padding: 0 6px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.setting-options {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

label.row {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.875rem;
  color: var(--color-text-main);
  cursor: pointer;
  user-select: none;
}

label.row input[type="checkbox"] {
  appearance: none;
  -webkit-appearance: none;
  width: 16px;
  height: 16px;
  border: 1.5px solid #ADB5BD;
  border-radius: var(--radius-sm);
  background-color: #FFFFFF;
  cursor: pointer;
  display: grid;
  place-content: center;
  margin: 0;
  transition: all var(--transition-fast);
}

label.row input[type="checkbox"]:checked {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
}

label.row input[type="checkbox"]:checked::before {
  content: "";
  width: 8px;
  height: 4px;
  border-left: 2px solid #FFFFFF;
  border-bottom: 2px solid #FFFFFF;
  transform: rotate(-45deg) translate(1px, -1px);
}

.select-group {
  margin-top: 12px;
  border-top: 1px solid var(--color-border-light);
  padding-top: 12px;
}

.select-label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-text-muted);
  margin-bottom: 6px;
  display: block;
}

select {
  width: 100%;
  padding: 8px 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: 0.875rem;
  color: var(--color-text-main);
  background-color: #FFFFFF;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  outline: none;
}

select:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 2px rgba(0, 123, 255, 0.2);
}

/* Summary Box */
.summary {
  padding: 12px 16px;
  background-color: var(--color-primary-light);
  border: 1px solid #B8DAFF;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  color: #004085;
  text-align: center;
  font-weight: 500;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.summary-warning {
  color: #856404;
  background-color: var(--color-warning-bg);
  border-color: #FFEEBA;
}

/* ==========================================================================
   Main Preview Area
   ========================================================================== */
.main {
  overflow-y: auto;
  padding: 0;
  background-color: #F1F3F5;
  position: relative;
}

.preview-container {
  max-width: 900px;
  margin: 0 auto;
  padding: 24px 20px 48px;
}

/* Document Container */
.doc {
  background: var(--color-surface);
  margin: 0 auto 28px;
  max-width: 860px;
  box-shadow: var(--shadow-card);
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  overflow: hidden;
}

.doc > .label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--color-bg-neutral);
  padding: 10px 18px;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-secondary);
  border-bottom: 1px solid var(--color-border);
}

.doc > .label .doc-badge {
  font-family: var(--font-family-mono);
  font-size: 0.75rem;
  color: var(--color-text-muted);
  font-weight: 500;
}

.doc section {
  position: relative;
  box-sizing: border-box;
  font-family: var(--font-family-doc);
}

/* ==========================================================================
   Headers & Footers (Real-time Preview & Print)
   ========================================================================== */
.doc-page-header,
.doc-page-footer {
  display: none;
  pointer-events: none;
  user-select: none;
  font-family: var(--font-family-mono);
  font-size: 11px;
  color: #495057;
}

body.show-hf .doc-page-header {
  display: flex !important;
  justify-content: space-between;
  align-items: center;
  position: absolute;
  top: 6mm;
  left: 10mm;
  right: 10mm;
  border-bottom: 1px dashed #CBD5E1;
  padding-bottom: 3px;
  z-index: 10;
  background: rgba(255, 255, 255, 0.92);
}

body.show-hf .doc-page-footer {
  display: flex !important;
  justify-content: space-between;
  align-items: center;
  position: absolute;
  bottom: 6mm;
  left: 10mm;
  right: 10mm;
  border-top: 1px dashed #CBD5E1;
  padding-top: 3px;
  z-index: 10;
  background: rgba(255, 255, 255, 0.92);
}

.doc-page-header .hf-date,
.doc-page-footer .hf-url {
  color: #6C757D;
  font-size: 10.5px;
  max-width: 48%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.doc-page-header .hf-title,
.doc-page-footer .hf-page {
  color: #212529;
  font-weight: 600;
  font-size: 10.5px;
  max-width: 48%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* Empty State */
.empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  color: var(--color-text-muted);
  margin-top: 100px;
  text-align: center;
}

.empty-icon {
  width: 64px;
  height: 64px;
  color: #ADB5BD;
}

.empty-title {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-secondary);
  margin: 0;
}

.empty-desc {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  max-width: 320px;
  margin: 0;
}

/* ==========================================================================
   Separator Page (Real-time Preview & Print)
   ========================================================================== */
.sepPage {
  background: #FFFFFF;
  margin: 0 auto 28px;
  max-width: 860px;
  min-height: 420px;
  box-shadow: var(--shadow-card);
  border-radius: var(--radius-sm);
  border: 2px dashed #007BFF;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px 24px;
  box-sizing: border-box;
  text-align: center;
  position: relative;
  transition: all var(--transition-fast);
}

.sep-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  max-width: 600px;
}

.sep-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  background-color: var(--color-primary-light);
  color: var(--color-primary-dark);
  font-size: 0.75rem;
  font-weight: 700;
  border-radius: 99px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.sep-icon {
  margin: 6px 0;
  color: var(--color-primary);
}

.sep-title {
  margin: 0;
  font-size: 1.625rem;
  font-weight: 700;
  color: var(--color-secondary);
  word-break: break-word;
  line-height: 1.3;
}

.sep-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.875rem;
  color: var(--color-text-muted);
  font-family: var(--font-family-mono);
}

.row-hint {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  margin-top: -2px;
  margin-bottom: 8px;
  padding-left: 26px;
  line-height: 1.4;
}

/* Toast Notification */
.toast {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background-color: var(--color-secondary);
  color: #FFFFFF;
  padding: 10px 18px;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 500;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.16);
  display: flex;
  align-items: center;
  gap: 8px;
  z-index: 999;
  opacity: 0;
  pointer-events: none;
  transform: translateY(12px);
  transition: opacity 0.25s ease, transform 0.25s ease;
}

.toast.show {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

/* ==========================================================================
   Universal View Switcher Nav Component Styles
   ========================================================================== */
.view-nav {
  display: flex;
  justify-content: center;
  align-items: center;
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding: 6px 16px;
  position: sticky;
  top: 64px;
  z-index: 95;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.03);
}

.view-nav-container {
  display: inline-flex;
  background-color: var(--color-bg-neutral);
  padding: 4px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  gap: 4px;
  max-width: 640px;
  width: 100%;
}

.view-tab-btn {
  flex: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 7px 12px;
  font-family: var(--font-family-base);
  font-size: 0.8125rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  border: none;
  background: transparent;
  color: var(--color-text-muted);
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
  min-height: 36px;
}

.view-tab-btn:hover:not(.active) {
  color: var(--color-text-main);
  background-color: rgba(0, 0, 0, 0.04);
}

.view-tab-btn.active {
  background-color: var(--color-surface);
  color: var(--color-primary);
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.08);
  font-weight: 700;
}

.view-tab-badge {
  font-size: 0.6875rem;
  font-family: var(--font-family-mono);
  background: #DEE2E6;
  color: var(--color-secondary);
  padding: 1px 6px;
  border-radius: 99px;
  font-weight: 700;
}

.view-tab-btn.active .view-tab-badge {
  background: var(--color-primary-light);
  color: var(--color-primary);
}

.tab-label-mobile {
  display: none;
}
.tab-label-desktop {
  display: inline;
}

/* Preview Bar */
.preview-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 18px;
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 40;
}

.preview-bar-left {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--color-secondary);
  font-weight: 600;
  font-size: 0.875rem;
}

.preview-bar-left svg {
  color: var(--color-primary);
}

.preview-bar-badge {
  font-size: 0.75rem;
  font-family: var(--font-family-mono);
  background: var(--color-primary-light);
  color: var(--color-primary);
  padding: 2px 8px;
  border-radius: 99px;
  font-weight: 600;
}

.jump-top-btn {
  display: none;
}

.jump-preview-btn {
  display: none;
  width: 100%;
  padding: 10px;
  font-weight: 600;
  color: var(--color-primary);
  border-color: var(--color-primary);
  background-color: var(--color-primary-light);
  margin-top: 8px;
}

.jump-preview-btn:hover {
  background-color: #D6E8FF;
}

.mobile-bottom-bar {
  display: none;
}

/* ==========================================================================
   Responsive Breakpoints: Tablets (769px - 1024px)
   ========================================================================== */
@media (min-width: 769px) and (max-width: 1024px) {
  .app {
    grid-template-columns: 320px 1fr;
  }
  .shortcut-tip {
    display: none;
  }
  .bar-subtitle {
    display: none;
  }
}

/* ==========================================================================
   Responsive Breakpoints: Mobile Phones & Narrow Screens (<= 768px)
   ========================================================================== */
@media (max-width: 768px) {
  /* Header */
  .bar {
    height: 56px;
    padding: 0 12px;
    gap: 8px;
  }

  .brand {
    gap: 8px;
  }

  .brand-img {
    width: 32px;
    height: 32px;
  }

  .bar h1 {
    font-size: 1.0625rem;
  }

  .bar-subtitle {
    display: none;
  }

  .shortcut-tip {
    display: none;
  }

  .actions-group {
    display: none; /* Handled by sticky bottom bar on mobile */
  }

  .view-nav {
    top: 56px;
    padding: 6px 10px;
  }

  .tab-label-desktop {
    display: none;
  }
  .tab-label-mobile {
    display: inline;
  }

  /* Layout Container on Mobile */
  .app {
    display: flex;
    flex-direction: column;
    height: auto;
    min-height: calc(100dvh - 56px - 49px);
    overflow: visible;
  }

  /* View: All (Default in Mobile - Shows BOTH side & main preview!) */
  body.view-all .app {
    display: flex;
    flex-direction: column;
    height: auto;
    overflow: visible;
    padding: 0;
  }

  body.view-all .side {
    display: flex;
    width: 100%;
    max-width: 100%;
    margin: 0;
    padding: 14px 14px 20px 14px;
    border-right: none;
    border-bottom: 2px dashed var(--color-border);
    box-shadow: none;
    border-radius: 0;
    overflow: visible;
  }

  body.view-all .main {
    display: flex;
    flex-direction: column;
    width: 100%;
    padding: 0 0 84px 0;
    overflow: visible;
  }

  body.view-all .jump-preview-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
  }

  body.view-all .jump-top-btn {
    display: inline-flex;
    align-items: center;
    gap: 4px;
  }

  /* View: Files Only */
  body.view-files .app {
    display: flex;
    flex-direction: column;
    height: auto;
    padding: 0;
    background: transparent;
  }

  body.view-files .side {
    display: flex;
    width: 100%;
    max-width: 100%;
    margin: 0;
    border: none;
    box-shadow: none;
    border-radius: 0;
    padding: 14px 14px 84px 14px;
    overflow: visible;
  }

  body.view-files .main {
    display: none !important;
  }

  /* View: Preview Only */
  body.view-preview .app {
    display: block;
    height: auto;
    overflow: visible;
    padding: 0;
  }

  body.view-preview .side {
    display: none !important;
  }

  body.view-preview .main {
    display: flex;
    flex-direction: column;
    width: 100%;
    padding: 0 0 84px 0;
    overflow: visible;
  }

  /* Touch-friendly components */
  #drop {
    padding: 22px 14px;
  }

  #drop svg {
    width: 32px;
    height: 32px;
  }

  .drop-title {
    font-size: 0.875rem;
  }

  .list-controls button {
    min-height: 40px;
  }

  ul#list {
    max-height: none;
    flex-shrink: 0;
    min-height: fit-content;
  }

  ul#list li {
    padding: 10px 8px;
    min-height: 48px;
  }

  .handle {
    padding: 8px;
  }

  .del {
    padding: 8px;
    font-size: 1.1rem;
    min-width: 36px;
    min-height: 36px;
  }

  label.row {
    padding: 8px 0;
  }

  select {
    padding: 10px 12px;
    font-size: 0.9375rem;
  }

  /* Document Preview responsive fit */
  .preview-container {
    width: 100%;
    max-width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  .doc {
    max-width: 100%;
    margin-bottom: 20px;
  }

  .doc section {
    max-width: 100% !important;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  .doc section table {
    max-width: 100% !important;
  }

  .doc section img {
    max-width: 100% !important;
    height: auto !important;
  }

  /* Sticky Bottom Action Bar */
  .mobile-bottom-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: 62px;
    background-color: var(--color-surface);
    border-top: 1px solid var(--color-border);
    padding: 0 16px;
    z-index: 100;
    box-shadow: 0 -3px 12px rgba(0, 0, 0, 0.08);
  }

  .mobile-summary-text {
    font-size: 0.8125rem;
    color: var(--color-secondary);
    font-weight: 600;
    max-width: 48%;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .mobile-actions {
    display: flex;
    gap: 8px;
  }

  .mobile-actions .btn {
    min-height: 42px;
    padding: 9px 15px;
    font-size: 0.875rem;
  }

  /* Footer mobile layout */
  .site-footer {
    height: auto;
    padding: 16px 0 calc(62px + 20px) 0;
  }

  .footer-inner {
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 10px;
    padding: 0 16px;
  }

  .footer-col-brand {
    order: 1;
    flex-wrap: wrap;
    justify-content: center;
  }

  .footer-col-shortcuts {
    order: 2;
  }

  .footer-col-privacy {
    order: 3;
  }

  .footer-tip {
    font-size: 0.75rem;
  }
}

/* ==========================================================================
   Download Format Selection Modal
   ========================================================================== */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background-color: rgba(15, 23, 42, 0.55);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.22s ease, visibility 0.22s ease;
}

.modal-backdrop.open {
  opacity: 1;
  visibility: visible;
}

.modal-card {
  background-color: var(--color-surface);
  border-radius: var(--radius-md);
  box-shadow: 0 20px 48px -10px rgba(15, 23, 42, 0.25), 0 0 0 1px rgba(0, 0, 0, 0.05);
  width: 100%;
  max-width: 520px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transform: translateY(16px) scale(0.98);
  transition: transform 0.22s cubic-bezier(0.16, 1, 0.3, 1);
}

.modal-backdrop.open .modal-card {
  transform: translateY(0) scale(1);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 20px 14px 20px;
  border-bottom: 1px solid var(--color-border);
}

.modal-title-wrap {
  display: flex;
  align-items: center;
  gap: 12px;
}

.modal-header-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background-color: var(--color-primary-light);
  color: var(--color-primary);
  display: grid;
  place-content: center;
  flex-shrink: 0;
}

.modal-title {
  margin: 0;
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--color-secondary);
  line-height: 1.3;
}

.modal-desc {
  margin: 2px 0 0 0;
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

.modal-close-btn {
  background: transparent;
  border: none;
  color: #94A3B8;
  cursor: pointer;
  padding: 8px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.modal-close-btn:hover {
  background-color: var(--color-bg-neutral);
  color: var(--color-secondary);
}

.modal-body {
  padding: 16px 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.download-option-card {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 12px 14px;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  cursor: pointer;
  text-align: left;
  font-family: inherit;
  width: 100%;
  transition: all 0.18s ease;
  position: relative;
}

.download-option-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lift);
}

.download-option-card:active {
  transform: translateY(0);
}

/* Option Icon Box */
.option-icon-box {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  gap: 2px;
}

.file-tag {
  font-size: 9px;
  font-weight: 800;
  font-family: var(--font-family-mono);
  letter-spacing: 0.04em;
  line-height: 1;
}

/* PDF Card */
.pdf-card:hover {
  border-color: #EF4444;
  background-color: #FEF2F2;
}

.pdf-icon-box {
  background-color: #FEE2E2;
  color: #DC2626;
}

.pdf-tag {
  color: #DC2626;
}

/* Word Card */
.word-card:hover {
  border-color: #2563EB;
  background-color: #EFF6FF;
}

.word-icon-box {
  background-color: #DBEAFE;
  color: #1D4ED8;
}

.word-tag {
  color: #1D4ED8;
}

/* ZIP Card */
.zip-card:hover {
  border-color: #7C3AED;
  background-color: #F5F3FF;
}

.zip-icon-box {
  background-color: #EDE9FE;
  color: #6D28D9;
}

.zip-tag {
  color: #6D28D9;
}

.option-info {
  flex: 1;
  min-width: 0;
}

.option-head {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 2px;
}

.option-name {
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--color-secondary);
}

.option-badge {
  font-size: 0.6875rem;
  font-weight: 600;
  padding: 1px 7px;
  border-radius: 99px;
  background-color: #FEE2E2;
  color: #DC2626;
}

.option-badge.word-badge {
  background-color: #DBEAFE;
  color: #1D4ED8;
}

.option-desc {
  margin: 0;
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  line-height: 1.35;
}

.option-arrow {
  color: #94A3B8;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.15s ease, color 0.15s ease;
}

.download-option-card:hover .option-arrow {
  color: var(--color-secondary);
  transform: translateX(3px);
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  padding: 10px 20px 16px 20px;
  border-top: 1px solid var(--color-border-light);
  background-color: var(--color-bg-neutral);
}

/* ==========================================================================
   PRINT MEDIA STYLES
   ========================================================================== */
@media print {
  .view-nav,
  .preview-bar,
  .jump-preview-btn,
  .mobile-bottom-bar,
  .site-footer,
  #siteFooter,
  .lang-dropdown,
  #langDropdown,
  #toast,
  .toast,
  #downloadModal,
  .modal-backdrop,
  .modal,
  .modal-card {
    display: none !important;
    visibility: hidden !important;
    opacity: 0 !important;
  }

  @page {
    margin: 0;
  }

  html,
  body {
    margin: 0 !important;
    padding: 0 !important;
    background: #FFFFFF !important;
    -webkit-print-color-adjust: exact;
    print-color-adjust: exact;
  }

  .bar,
  .side,
  #drop,
  .doc > .label,
  #toast,
  .toast,
  #downloadModal,
  .modal-backdrop {
    display: none !important;
    visibility: hidden !important;
    opacity: 0 !important;
  }

  body,
  .main {
    background: #FFFFFF !important;
    padding: 0 !important;
    margin: 0 !important;
    overflow: visible !important;
  }

  .app {
    display: block !important;
    height: auto !important;
  }

  .preview-container {
    max-width: none !important;
    margin: 0 !important;
    padding: 0 !important;
  }

  .doc {
    box-shadow: none !important;
    margin: 0 !important;
    padding: 0 !important;
    max-width: none !important;
    border: none !important;
    border-radius: 0 !important;
    background: transparent !important;
  }

  /* รักษา padding เดิมจาก docx-preview เพื่อให้ระยะขอบตรงกับไฟล์ Word ต้นฉบับ */
  .doc section {
    margin: 0 auto !important;
    box-sizing: border-box !important;
    font-family: var(--font-family-doc) !important;
    break-after: page;
    page-break-after: always;
    break-inside: avoid;
    page-break-inside: avoid;
  }

  .doc:last-child section:last-child {
    break-after: auto;
    page-break-after: auto;
  }

  /* ควบคุมการพิมพ์หัว/ท้ายกระดาษตาม Checkbox */
  body.show-hf .doc-page-header {
    display: flex !important;
    position: absolute !important;
    top: 5mm !important;
    left: 8mm !important;
    right: 8mm !important;
    border-bottom: 0.5pt solid #CBD5E1 !important;
    background: transparent !important;
  }

  body.show-hf .doc-page-footer {
    display: flex !important;
    position: absolute !important;
    bottom: 5mm !important;
    left: 8mm !important;
    right: 8mm !important;
    border-top: 0.5pt solid #CBD5E1 !important;
    background: transparent !important;
  }

  body:not(.show-hf) .doc-page-header,
  body:not(.show-hf) .doc-page-footer {
    display: none !important;
  }

  .sepPage {
    display: flex !important;
    flex-direction: column !important;
    align-items: center !important;
    justify-content: center !important;
    height: 100vh !important;
    min-height: 100vh !important;
    border: none !important;
    box-shadow: none !important;
    margin: 0 !important;
    max-width: none !important;
    padding: 0 !important;
    break-after: page !important;
    page-break-after: always !important;
    break-inside: avoid !important;
    page-break-inside: avoid !important;
  }

  .sepPage .sep-title {
    font-size: 2.25rem !important;
    color: #111 !important;
  }

  .sepPage .sep-badge {
    border: 1px solid #007BFF !important;
    -webkit-print-color-adjust: exact !important;
    print-color-adjust: exact !important;
  }
}