/* Custom CSS Variable Design System for Premium Look & Feel */
:root {
  /* Colors */
  --bg-primary: #0f172a;      /* Dark slate */
  --bg-secondary: #1e293b;    /* Slate 800 */
  --bg-tertiary: #334155;     /* Slate 700 */
  --bg-body: #f8fafc;         /* Off-white */
  --text-main: #334155;       /* Slate 700 */
  --text-light: #64748b;      /* Slate 500 */
  --text-lighter: #94a3b8;    /* Slate 400 */
  --accent: #3b82f6;          /* Neon blue */
  --accent-hover: #2563eb;
  --accent-light: rgba(59, 130, 246, 0.1);
  --success: #10b981;
  --success-hover: #059669;
  --danger: #ef4444;
  --danger-hover: #dc2626;
  --warning: #f59e0b;

  /* Layout and sizing */
  --sidebar-width: 420px;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.05), 0 4px 6px -4px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.08), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);

  /* Label specific layout variables (Updated dynamically via JS) */
  --margin-top: 8.5mm;
  --margin-bottom: 8.5mm;
  --margin-left: 5mm;
  --margin-right: 5mm;
  --label-width: 100mm;
  --label-height: 35mm;
  --gap-x: 0mm;
  --gap-y: 0mm;
  --font-zip: 14pt;
  --font-address: 13pt;
  --font-phone: 12pt;
  --font-company: 13pt;
  --font-contact: 13pt;
  --font-sender: 9.5pt;
  --row-spacing: 2mm;
  --label-padding-y: 3mm;
  --label-padding-x: 5mm;
  --font-family-recipient: 'Noto Sans TC', sans-serif;
  --border-style: dashed;
  --border-color: #d1d5db;
}

/* Base Styles */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Inter', 'Noto Sans TC', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  color: var(--text-main);
  background-color: var(--bg-body);
  height: 100vh;
  overflow: hidden;
}

/* Layout Container */
.app-container {
  display: flex;
  height: 100vh;
  width: 100vw;
}

/* Sidebar Styling (Left Pane) */
.sidebar {
  width: var(--sidebar-width);
  background-color: var(--bg-primary);
  color: #f8fafc;
  display: flex;
  flex-direction: column;
  height: 100%;
  box-shadow: 4px 0 24px rgba(0, 0, 0, 0.15);
  z-index: 10;
  flex-shrink: 0;
}

.app-header {
  padding: 24px 24px 16px 24px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 6px;
}

.logo-icon {
  color: var(--accent);
  width: 28px;
  height: 28px;
}

.logo h1 {
  font-size: 1.25rem;
  font-weight: 700;
  background: linear-gradient(135deg, #fff 30%, var(--accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.subtitle {
  font-size: 0.8rem;
  color: var(--text-lighter);
}

/* Tabs Navigation */
.tabs-nav {
  display: flex;
  background-color: rgba(0, 0, 0, 0.2);
  padding: 6px;
  margin: 12px 16px 8px 16px;
  border-radius: var(--radius-md);
  gap: 4px;
}

.tab-btn {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: none;
  border: none;
  color: var(--text-lighter);
  padding: 8px 4px;
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: var(--transition);
  white-space: nowrap;
}

.tab-btn i {
  width: 16px;
  height: 16px;
}

.tab-btn:hover {
  color: #fff;
  background-color: rgba(255, 255, 255, 0.05);
}

.tab-btn.active {
  color: #fff;
  background-color: var(--accent);
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.25);
}

/* Tab Contents */
.tab-content-container {
  flex: 1;
  overflow-y: auto;
  padding: 8px 16px;
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
}

/* Cards inside Sidebar */
.card {
  background-color: var(--bg-secondary);
  border-radius: var(--radius-md);
  padding: 20px;
  margin-bottom: 16px;
  box-shadow: var(--shadow-sm);
  border: 1px solid rgba(255, 255, 255, 0.04);
}

.card-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  padding-bottom: 10px;
}

.card-header i {
  color: var(--accent);
  width: 20px;
  height: 20px;
}

.card-header h2 {
  font-size: 0.95rem;
  font-weight: 600;
  color: #fff;
}

/* Input Fields and Forms */
.form-group {
  margin-bottom: 14px;
}

.form-group label {
  display: block;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-lighter);
  margin-bottom: 6px;
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  background-color: var(--bg-tertiary);
  border: 1px solid rgba(255, 255, 255, 0.08);
  color: #fff;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  transition: var(--transition);
  font-family: inherit;
}

select option,
#font-family-select option {
  background-color: #1a202c; /* Dark Slate background */
  color: #ffffff;            /* White text */
}

.form-group textarea {
  resize: vertical;
  line-height: 1.5;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

.form-row {
  display: flex;
  gap: 12px;
}

.form-row .form-group {
  flex: 1;
}

.checkbox-group {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 10px;
  cursor: pointer;
}

.checkbox-group input[type="checkbox"] {
  width: 16px;
  height: 16px;
  accent-color: var(--accent);
  cursor: pointer;
}

.checkbox-group label {
  font-size: 0.85rem;
  color: var(--text-lighter);
  user-select: none;
  cursor: pointer;
}

/* Calibration Sliders */
.slider-control {
  margin-bottom: 16px;
}

.slider-header {
  display: flex;
  justify-content: space-between;
  font-size: 0.8rem;
  color: var(--text-lighter);
  margin-bottom: 6px;
}

.slider-header span:last-child {
  font-weight: 600;
  color: var(--accent);
}

.slider-control input[type="range"] {
  width: 100%;
  height: 6px;
  background-color: var(--bg-tertiary);
  border-radius: 3px;
  outline: none;
  accent-color: var(--accent);
  cursor: pointer;
}

.divider {
  height: 1px;
  background-color: rgba(255, 255, 255, 0.08);
  margin: 16px 0;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: var(--transition);
  text-decoration: none;
}

.btn-block {
  display: flex;
  width: 100%;
}

.btn-sm {
  padding: 6px 12px;
  font-size: 0.75rem;
}

.btn-lg {
  padding: 14px 24px;
  font-size: 1rem;
}

.btn-primary {
  background-color: var(--accent);
  color: #fff;
}

.btn-primary:hover {
  background-color: var(--accent-hover);
  box-shadow: 0 4px 14px rgba(59, 130, 246, 0.3);
}

.btn-secondary {
  background-color: var(--bg-tertiary);
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.btn-secondary:hover {
  background-color: rgba(255, 255, 255, 0.1);
}

.btn-success {
  background-color: var(--success);
  color: #fff;
}

.btn-success:hover {
  background-color: var(--success-hover);
  box-shadow: 0 4px 14px rgba(16, 185, 129, 0.3);
}

.btn-warning {
  background-color: var(--warning);
  color: #0f172a;
}

.btn-warning:hover {
  background-color: #d97706;
}

.btn-danger-outline {
  background: transparent;
  color: var(--danger);
  border: 1px solid rgba(239, 68, 68, 0.3);
}

.btn-danger-outline:hover {
  background-color: rgba(239, 68, 68, 0.1);
}

.btn-group {
  display: flex;
  gap: 12px;
}

.btn-group .btn {
  flex: 1;
}

.btn-icon {
  background: var(--bg-secondary);
  border: 1px solid rgba(255, 255, 255, 0.08);
  color: #f8fafc;
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition);
}

.btn-icon:hover {
  background-color: var(--bg-tertiary);
  color: var(--accent);
}

/* Recipient Table */
.list-card {
  padding: 16px;
}

.list-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 8px;
}

.recipient-list-wrapper {
  max-height: 380px;
  overflow-y: auto;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(255, 255, 255, 0.06);
}

.recipient-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.8rem;
}

.recipient-table th,
.recipient-table td {
  padding: 10px 12px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  color: var(--text-lighter);
}

.recipient-table th {
  background-color: rgba(0, 0, 0, 0.15);
  font-weight: 600;
  color: #fff;
}

.recipient-table tr:hover td {
  background-color: rgba(255, 255, 255, 0.02);
}

.rec-info-cell {
  line-height: 1.4;
}

.rec-info-cell .company-title {
  font-weight: 600;
  color: #fff;
  display: block;
}

.rec-info-cell .addr {
  font-size: 0.75rem;
  color: var(--text-lighter);
  display: block;
}

.rec-info-cell .contact {
  font-size: 0.75rem;
  color: var(--accent);
  display: block;
}

.action-btns {
  display: flex;
  gap: 4px;
}

.action-btns button {
  background: none;
  border: none;
  color: var(--text-lighter);
  cursor: pointer;
  padding: 4px;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.action-btns button:hover {
  background-color: rgba(255, 255, 255, 0.05);
}

.action-btns button.delete-btn:hover {
  color: var(--danger);
}

.empty-state {
  padding: 40px 20px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.empty-state.hidden {
  display: none !important;
}

.empty-state i {
  width: 48px;
  height: 48px;
  color: var(--text-lighter);
  opacity: 0.4;
}

.empty-state p {
  font-size: 0.85rem;
  color: var(--text-lighter);
}

/* Bulk Help List */
.instruction {
  font-size: 0.8rem;
  color: var(--text-lighter);
  margin-bottom: 12px;
  line-height: 1.4;
}

.help-list {
  padding-left: 18px;
  font-size: 0.78rem;
  color: var(--text-lighter);
  line-height: 1.6;
}

.help-list li {
  margin-bottom: 6px;
}

/* Sidebar Footer */
.sidebar-footer {
  padding: 16px 20px 24px 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  background-color: rgba(0, 0, 0, 0.15);
}

.footer-tip {
  font-size: 0.72rem;
  color: var(--text-lighter);
  margin-top: 12px;
  line-height: 1.4;
  text-align: center;
}

/* Right Pane Preview Area Styling */
.preview-area {
  flex: 1;
  height: 100%;
  overflow: auto;
  background-color: #e2e8f0;
  display: flex;
  flex-direction: column;
  position: relative;
}

.preview-toolbar {
  background-color: #fff;
  border-bottom: 1px solid #cbd5e1;
  padding: 12px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 5;
}

.toolbar-left {
  display: flex;
  align-items: center;
  gap: 12px;
}

.preview-badge {
  font-size: 0.8rem;
  font-weight: 600;
  background-color: var(--accent-light);
  color: var(--accent);
  padding: 4px 10px;
  border-radius: 12px;
}

#page-count-badge {
  font-size: 0.8rem;
  color: var(--text-light);
}

.toolbar-right {
  display: flex;
  align-items: center;
  gap: 10px;
}

.toolbar-right .btn-icon {
  background-color: #f1f5f9;
  border-color: #e2e8f0;
  color: var(--text-main);
  width: 28px;
  height: 28px;
}

.toolbar-right .btn-icon:hover {
  background-color: #e2e8f0;
}

#zoom-level {
  font-size: 0.85rem;
  font-weight: 600;
  width: 48px;
  text-align: center;
  user-select: none;
}

/* Sheet Container for simulated pages */
.sheet-container {
  flex: 1;
  padding: 40px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 30px;
  transform-origin: top center;
  transition: transform 0.2s ease;
}

/* Simulated A4 Page styling on screen */
.sheet {
  width: 210mm;
  height: 297mm;
  background-color: #ffffff;
  box-shadow: 0 12px 36px rgba(0, 0, 0, 0.15);
  border-radius: 2px;
  box-sizing: border-box;
  padding: var(--margin-top) var(--margin-right) var(--margin-bottom) var(--margin-left);
  
  display: grid;
  grid-template-columns: var(--label-width) var(--label-width);
  grid-template-rows: repeat(8, var(--label-height));
  column-gap: var(--gap-x);
  row-gap: var(--gap-y);
  position: relative;
  overflow: hidden;
}

/* Individual label styling */
.label-cell {
  box-sizing: border-box;
  border: 0.5px var(--border-style) var(--border-color);
  padding: var(--label-padding-y) var(--label-padding-x);
  display: flex;
  flex-direction: column;
  justify-content: center;
  position: relative;
  overflow: hidden;
  background-color: #fff;
}

/* Sender block styling */
.sender-block {
  font-size: var(--font-sender);
  line-height: 1.3;
  color: #374151; /* Dark gray */
  margin-bottom: 1.5mm;
  border-bottom: 0.5px dashed #e5e7eb;
  padding-bottom: 1mm;
  display: flex;
  align-items: flex-start;
  gap: 1mm;
}

.sender-tag {
  font-weight: bold;
  background-color: #f3f4f6;
  padding: 0.2mm 1mm;
  border-radius: 2px;
  font-size: 0.85em;
  flex-shrink: 0;
}

.sender-content {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* Recipient block styling - LARGE BOLD BLACK font */
.recipient-block {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  color: #000000; /* Deep absolute black */
  font-weight: 900 !important;
}

.rec-address-line {
  font-size: var(--font-recipient);
  font-weight: 900; /* Extra bold black */
  line-height: 1.4;
  word-break: break-all;
}

.rec-zip-code {
  font-weight: 900;
  letter-spacing: 1px;
  margin-right: 2mm;
  font-family: 'Inter', sans-serif;
  color: #000;
}

.rec-main-row {
  margin-top: 1.5mm;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  border-top: 1.5px solid #000000;
  padding-top: 1.5mm;
}

.rec-name {
  font-size: calc(var(--font-recipient) * 1.15);
  font-weight: 900; /* Extra bold black */
  word-break: break-all;
}

.rec-suffix {
  font-size: calc(var(--font-recipient) * 0.9);
  font-weight: 900;
  margin-left: 2mm;
  flex-shrink: 0;
}

/* Custom Overrides for Image Layout (left-aligned, uniform, bold black text) */
.recipient-block.image-layout {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: flex-start;
  text-align: left;
  width: 100%;
  height: 100%;
}

.recipient-block.image-layout div {
  font-family: var(--font-family-recipient), 'Noto Sans TC', sans-serif;
  font-weight: 900 !important; /* Extra Bold Black */
  color: #000000;
  line-height: 1.5;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  width: 100%;
  margin-bottom: var(--row-spacing);
}

.recipient-block.image-layout div:last-child {
  margin-bottom: 0;
}

.recipient-block.image-layout .line-zip {
  font-family: var(--font-family-recipient), 'Inter', sans-serif;
  font-size: var(--font-zip);
  letter-spacing: 2px;
}

.recipient-block.image-layout .line-address {
  font-size: var(--font-address);
}

.recipient-block.image-layout .line-phone {
  font-size: var(--font-phone);
}

.recipient-block.image-layout .line-company {
  font-size: var(--font-company);
}

.recipient-block.image-layout .line-contact {
  font-size: var(--font-contact);
}

/* Empty Label indicator for previews */
.empty-label {
  display: flex;
  align-items: center;
  justify-content: center;
  color: #d1d5db;
  font-size: 0.85rem;
  font-style: italic;
  background-color: #fbfbfb;
  border: 0.5px dashed #e5e7eb;
}

/* PRINT CSS SPECIFICS */
@media print {
  @page {
    size: A4 portrait;
    margin: 0; /* 移除瀏覽器預設的頁首頁尾 (如日期、網址、頁次等) */
  }

  /* Hide UI elements */
  .no-print,
  .sidebar,
  .preview-toolbar {
    display: none !important;
  }

  body, html {
    height: auto !important;
    overflow: visible !important;
    background-color: #fff !important;
    margin: 0 !important;
    padding: 0 !important;
  }

  .app-container {
    display: block !important;
    height: auto !important;
    width: auto !important;
    overflow: visible !important;
    margin: 0 !important;
    padding: 0 !important;
  }

  .preview-area {
    display: block !important;
    height: auto !important;
    width: auto !important;
    overflow: visible !important;
    margin: 0 !important;
    padding: 0 !important;
    background-color: #fff !important;
  }

  .sheet-container {
    display: block !important;
    padding: 0 !important;
    margin: 0 !important;
    gap: 0 !important;
    transform: scale(1) !important;
    width: auto !important;
    height: auto !important;
  }

  /* Force exact A4 dimensions for each sheet */
  .sheet {
    box-shadow: none !important;
    margin: 0 !important;
    page-break-before: avoid !important;
    page-break-after: always !important;
    page-break-inside: avoid !important;
    width: 210mm !important;
    height: 297mm !important;
    box-sizing: border-box !important;
  }

  /* Optimize graphics printing */
  * {
    -webkit-print-color-adjust: exact !important;
    print-color-adjust: exact !important;
  }
}

#mobile-print-btn {
  display: none !important;
}

/* ==========================================
   MOBILE & TABLET RESPONSIVE STYLING
   ========================================== */
@media (max-width: 1024px) {
  #mobile-print-btn {
    display: inline-flex !important;
    align-items: center;
    gap: 4px;
    margin-right: 8px;
  }
  
  .app-container {
    flex-direction: column;
    height: auto;
    overflow: visible;
  }

  .sidebar {
    width: 100%;
    height: auto;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
  }

  .tab-content-container {
    max-height: 600px;
    overflow-y: auto;
  }

  .recipient-list-wrapper {
    max-height: 250px;
  }

  .preview-area {
    padding: 20px 10px;
    height: auto;
    overflow: visible;
    background-color: #cbd5e1;
    align-items: center;
  }

  .preview-toolbar {
    position: static;
    width: 100%;
    margin-bottom: 15px;
    border-radius: var(--radius-sm);
  }

  .sheet-container {
    padding: 20px 0;
    width: 100%;
    overflow-x: auto;
    display: flex;
    flex-direction: column;
    align-items: center;
  }
}

@media (max-width: 600px) {
  .tabs-nav {
    margin: 8px;
    padding: 4px;
    gap: 2px;
  }
  
  .tab-btn {
    font-size: 0.75rem;
    padding: 6px 2px;
    gap: 4px;
  }

  .tab-btn i {
    width: 14px;
    height: 14px;
  }

  .card {
    padding: 14px;
    margin-bottom: 12px;
  }

  .app-header {
    padding: 16px;
  }

  .logo h1 {
    font-size: 1.1rem;
  }

  .btn-group {
    flex-direction: column;
    gap: 8px;
  }
}