/* ==========================================================================
   QR Matrix Studio - Design System & Modern Cyber Dark/Light Theme
   ========================================================================== */

:root {
  /* Color Tokens - Dark Mode (Default) */
  --bg-app: #0b0f19;
  --bg-surface: #111827;
  --bg-card: #1e293b;
  --bg-card-hover: #243248;
  --bg-input: #0f172a;
  --border-color: #334155;
  --border-focus: #06b6d4;

  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;

  --color-primary: #06b6d4;
  --color-primary-hover: #0891b2;
  --color-primary-bg: rgba(6, 182, 212, 0.12);

  --color-emerald: #10b981;
  --color-emerald-hover: #059669;
  --color-emerald-bg: rgba(16, 185, 129, 0.12);

  --color-accent: #6366f1;
  --color-secondary: #8b5cf6;
  --color-danger: #ef4444;
  --color-warning: #f59e0b;

  /* Elevation & Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.25);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.35), 0 2px 4px -2px rgba(0, 0, 0, 0.25);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.45), 0 4px 6px -4px rgba(0, 0, 0, 0.35);
  --shadow-glow: 0 0 20px rgba(6, 182, 212, 0.25);

  /* Radius & Transitions */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-xl: 20px;
  --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
}

/* Light Theme Variables */
body.theme-light {
  --bg-app: #f1f5f9;
  --bg-surface: #ffffff;
  --bg-card: #ffffff;
  --bg-card-hover: #f8fafc;
  --bg-input: #f8fafc;
  --border-color: #cbd5e1;
  --border-focus: #0284c7;

  --text-main: #0f172a;
  --text-muted: #475569;
  --text-dim: #64748b;

  --color-primary: #0284c7;
  --color-primary-hover: #0369a1;
  --color-primary-bg: rgba(2, 132, 199, 0.08);

  --color-emerald: #059669;
  --color-emerald-hover: #047857;
  --color-emerald-bg: rgba(5, 150, 105, 0.08);

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08);
  --shadow-glow: 0 0 15px rgba(2, 132, 199, 0.15);
}

/* CSS Reset & Base */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background-color: var(--bg-app);
  color: var(--text-main);
  min-height: 100vh;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color 0.25s ease, color 0.25s ease;
}

/* Typography Helpers */
.font-mono {
  font-family: var(--font-mono);
}
.text-center { text-align: center; }
.text-cyan { color: var(--color-primary); }
.text-emerald { color: var(--color-emerald); }
.text-muted { color: var(--text-muted); }
.w-full { width: 100%; }
.mt-2 { margin-top: 0.5rem; }
.mt-3 { margin-top: 0.75rem; }
.mt-4 { margin-top: 1rem; }
.hidden { display: none !important; }
.flex-between {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* App Layout */
.app-layout {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* Header */
.app-header {
  background-color: var(--bg-surface);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: blur(12px);
}

.header-content {
  max-width: 1440px;
  margin: 0 auto;
  padding: 0.75rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.brand-area {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.brand-logo {
  width: 42px;
  height: 42px;
  flex-shrink: 0;
}

.brand-icon {
  width: 100%;
  height: 100%;
  display: block;
}

.brand-title {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.025em;
  background: linear-gradient(135deg, var(--text-main), var(--color-primary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

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

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

.nav-tabs {
  display: flex;
  background-color: var(--bg-input);
  padding: 0.25rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  gap: 0.25rem;
}

.tab-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.45rem 0.85rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-muted);
  background: transparent;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
}

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

.tab-btn:hover {
  color: var(--text-main);
  background-color: rgba(255, 255, 255, 0.04);
}

.tab-btn.active {
  color: #ffffff;
  background-color: var(--color-primary);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
}

body.theme-light .tab-btn.active {
  color: #ffffff;
  background-color: var(--color-primary);
}

/* Theme Toggle */
.theme-toggle {
  width: 38px;
  height: 38px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background-color: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-muted);
  cursor: pointer;
  transition: var(--transition);
}

.theme-toggle:hover {
  color: var(--text-main);
  border-color: var(--color-primary);
}

.theme-icon {
  width: 18px;
  height: 18px;
}

body.theme-dark .sun-icon { display: block; }
body.theme-dark .moon-icon { display: none; }
body.theme-light .sun-icon { display: none; }
body.theme-light .moon-icon { display: block; }

/* Main Workspace */
.app-main {
  flex: 1;
  max-width: 1440px;
  width: 100%;
  margin: 0 auto;
  padding: 1.5rem 1.25rem;
}

.tab-panel {
  display: none;
}

.tab-panel.active {
  display: block;
  animation: fadeIn 0.2s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Responsive Grid Layouts */
.workspace-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}

@media (min-width: 1024px) {
  .workspace-grid {
    grid-template-columns: 480px 1fr;
  }
  .workspace-grid.single-column {
    grid-template-columns: 1fr;
    max-width: 900px;
    margin: 0 auto;
  }
}

/* Cards */
.card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.card-header {
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  background-color: rgba(255, 255, 255, 0.015);
}

.card-title {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-main);
}

.card-title .icon {
  width: 18px;
  height: 18px;
  color: var(--color-primary);
}

.card-body {
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 1.15rem;
}

/* Badges & Meta */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.2rem 0.6rem;
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: 9999px;
  background-color: var(--bg-card);
  color: var(--text-muted);
  border: 1px solid var(--border-color);
}

.badge-cyan {
  background-color: var(--color-primary-bg);
  color: var(--color-primary);
  border-color: rgba(6, 182, 212, 0.3);
}

.text-meta-badge {
  font-size: 0.75rem;
  font-family: var(--font-mono);
  color: var(--text-dim);
  background-color: var(--bg-input);
  padding: 0.25rem 0.5rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
}

/* Form Controls */
.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.form-label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
}

.form-textarea, .form-input, .form-select {
  width: 100%;
  background-color: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-main);
  padding: 0.65rem 0.85rem;
  font-size: 0.9rem;
  transition: var(--transition);
  outline: none;
}

.form-textarea:focus, .form-input:focus, .form-select:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 2px var(--color-primary-bg);
}

.form-textarea {
  resize: vertical;
  min-height: 120px;
  line-height: 1.6;
}

.custom-sep-textarea {
  min-height: 60px;
  height: 68px;
  font-size: 0.85rem;
  line-height: 1.4;
}

/* Stepper Input */
.input-stepper {
  display: inline-flex;
  align-items: center;
  background-color: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.input-stepper .step-btn {
  width: 36px;
  height: 36px;
  background: transparent;
  border: none;
  color: var(--text-main);
  font-size: 1.1rem;
  cursor: pointer;
  transition: var(--transition);
}

.input-stepper .step-btn:hover {
  background-color: var(--bg-card);
  color: var(--color-primary);
}

.input-stepper .form-input {
  width: 60px;
  height: 36px;
  border: none;
  padding: 0;
  background: transparent;
}

.input-stepper.compact .step-btn {
  width: 30px;
  height: 30px;
  font-size: 1rem;
}

.input-stepper.compact .form-input {
  width: 44px;
  height: 30px;
  font-size: 0.85rem;
}

/* Radio Cards (Splitting Rules) */
.radio-cards {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.radio-card {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 0.75rem 0.85rem;
  background-color: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: var(--transition);
}

.radio-card:hover {
  border-color: var(--text-dim);
  background-color: var(--bg-card);
}

.radio-card input[type="radio"] {
  margin-top: 0.25rem;
  accent-color: var(--color-primary);
}

.radio-card:has(input[type="radio"]:checked) {
  border-color: var(--color-primary);
  background-color: var(--color-primary-bg);
}

.radio-card-title {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-main);
}

.radio-card-desc {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 0.15rem;
}

/* Segmented Control (Data Modes) */
.segmented-control {
  display: grid;
  grid-template-columns: 1fr 1fr;
  background-color: var(--bg-input);
  padding: 0.25rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  gap: 0.25rem;
}

.seg-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.5rem 0.75rem;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-muted);
  background: transparent;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: var(--transition);
}

.seg-btn:hover {
  color: var(--text-main);
}

.seg-btn.active {
  color: #ffffff;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
}

body.theme-light .seg-btn.active {
  color: var(--text-main);
  background-color: #ffffff;
}

/* Sub Config Box & Sliders */
.sub-config-box {
  background-color: var(--bg-input);
  border: 1px dashed var(--border-color);
  border-radius: var(--radius-md);
  padding: 0.75rem 0.85rem;
}

.range-header {
  display: flex;
  justify-content: space-between;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 0.4rem;
}

.range-val {
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--color-primary);
}

.form-range {
  width: 100%;
  accent-color: var(--color-primary);
}

.form-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}

.row-label {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* Switches & Toggles */
.toggle-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 0.85rem;
  background-color: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
}

.toggle-info {
  display: flex;
  flex-direction: column;
}

.toggle-title {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-main);
}

.toggle-desc {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 0.15rem;
}

.switch {
  position: relative;
  display: inline-block;
  width: 44px;
  height: 24px;
  flex-shrink: 0;
}

.switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.slider {
  position: absolute;
  cursor: pointer;
  inset: 0;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  transition: var(--transition);
  border-radius: 24px;
}

.slider:before {
  position: absolute;
  content: "";
  height: 16px;
  width: 16px;
  left: 3px;
  bottom: 3px;
  background-color: #ffffff;
  transition: var(--transition);
  border-radius: 50%;
}

.switch input:checked + .slider {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
}

.switch input:checked + .slider:before {
  transform: translateX(20px);
}

/* Crypto Content Box */
.crypto-panel {
  border-radius: var(--radius-md);
  overflow: hidden;
}

.crypto-content {
  background-color: var(--bg-input);
  border: 1px solid var(--border-color);
  border-top: none;
  padding: 0.85rem;
  border-bottom-left-radius: var(--radius-md);
  border-bottom-right-radius: var(--radius-md);
}

.crypto-alert {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  font-size: 0.775rem;
  color: var(--text-muted);
  background-color: var(--color-primary-bg);
  border: 1px solid rgba(6, 182, 212, 0.2);
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius-sm);
}

.input-with-action {
  display: flex;
  gap: 0.5rem;
}

.crypto-status-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 0.6rem;
  padding-top: 0.5rem;
  border-top: 1px dashed var(--border-color);
}

.key-badge {
  font-size: 0.75rem;
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
}

.key-badge.not-ready {
  background-color: rgba(239, 68, 68, 0.15);
  color: var(--color-danger);
}

.key-badge.ready {
  background-color: var(--color-emerald-bg);
  color: var(--color-emerald);
}

/* Logo Preview */
.logo-preview-box {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.logo-thumb {
  width: 32px;
  height: 32px;
  border-radius: 6px;
  background-color: #0f172a;
  border: 1px solid var(--border-color);
  object-fit: contain;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.6rem 1.15rem;
  font-size: 0.875rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
  min-height: 42px;
}

.btn-sm {
  padding: 0.4rem 0.85rem;
  font-size: 0.8rem;
  min-height: 32px;
}

.btn-xs {
  padding: 0.25rem 0.5rem;
  font-size: 0.75rem;
  min-height: 26px;
}

.btn-lg {
  padding: 0.85rem 1.5rem;
  font-size: 1rem;
  min-height: 48px;
}

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

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

.btn-secondary {
  background-color: var(--bg-card);
  border-color: var(--border-color);
  color: var(--text-main);
}

.btn-secondary:hover:not(:disabled) {
  background-color: var(--bg-card-hover);
  border-color: var(--text-dim);
}

.btn-emerald {
  background-color: var(--color-emerald);
  color: #ffffff;
}

.btn-emerald:hover:not(:disabled) {
  background-color: var(--color-emerald-hover);
  box-shadow: 0 0 15px rgba(16, 185, 129, 0.3);
}

.btn-outline {
  background-color: transparent;
  border-color: var(--border-color);
  color: var(--text-muted);
}

.btn-outline:hover:not(:disabled) {
  color: var(--text-main);
  border-color: var(--color-primary);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.link-btn {
  background: none;
  border: none;
  color: var(--color-primary);
  font-size: 0.75rem;
  cursor: pointer;
  text-decoration: underline;
  padding: 0;
}

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

.link-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* Icons */
.icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

.icon-sm {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

/* Right Panel: Composite & QR Gallery */
.composite-bar {
  background-color: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0.75rem 1rem;
}

.composite-controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.ctrl-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.ctrl-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

/* QR Gallery Grid */
.qr-gallery-container {
  min-height: 380px;
  display: flex;
  flex-direction: column;
}

.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 4rem 1rem;
  color: var(--text-dim);
  text-align: center;
}

.empty-icon {
  width: 56px;
  height: 56px;
  stroke: var(--border-color);
  margin-bottom: 1rem;
}

.empty-text {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-muted);
}

.empty-hint {
  font-size: 0.8rem;
  color: var(--text-dim);
  margin-top: 0.25rem;
}

.qr-cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 1rem;
  padding: 0.5rem 0;
}

.qr-card {
  background-color: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0.85rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  transition: var(--transition);
  position: relative;
}

.qr-card:hover {
  border-color: var(--color-primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.qr-card-badge {
  position: absolute;
  top: 0.5rem;
  left: 0.5rem;
  background-color: var(--color-primary);
  color: #ffffff;
  font-size: 0.7rem;
  font-weight: 700;
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
}

.qr-card-canvas-box {
  width: 100%;
  aspect-ratio: 1 / 1;
  background-color: #ffffff;
  border-radius: var(--radius-sm);
  padding: 0.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 1.25rem;
  cursor: pointer;
}

.qr-card-canvas {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.qr-card-info {
  width: 100%;
  margin-top: 0.6rem;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.qr-card-preview-text {
  font-size: 0.725rem;
  font-family: var(--font-mono);
  color: var(--text-dim);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  text-align: center;
}

.qr-card-actions {
  display: flex;
  width: 100%;
  gap: 0.4rem;
  margin-top: 0.5rem;
}

/* Scanner / Dropzone */
.drop-zone {
  border: 2px dashed var(--border-color);
  background-color: var(--bg-input);
  border-radius: var(--radius-lg);
  padding: 2.5rem 1.5rem;
  text-align: center;
  cursor: pointer;
  transition: var(--transition);
  outline: none;
}

.drop-zone:hover, .drop-zone:focus, .drop-zone.drag-over {
  border-color: var(--color-primary);
  background-color: var(--color-primary-bg);
}

.drop-zone-icon {
  width: 48px;
  height: 48px;
  margin: 0 auto 0.75rem;
  color: var(--color-primary);
}

.drop-zone-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-main);
}

.drop-zone-highlight {
  font-size: 0.85rem;
  color: var(--color-primary);
  margin-top: 0.5rem;
  background-color: var(--bg-card);
  display: inline-block;
  padding: 0.3rem 0.75rem;
  border-radius: 9999px;
  border: 1px solid var(--border-color);
}

.drop-zone-sub {
  font-size: 0.75rem;
  color: var(--text-dim);
  margin-top: 0.5rem;
}

/* File Upload Box */
.file-upload-box {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.form-file-input {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.file-info-text {
  font-size: 0.75rem;
  font-family: var(--font-mono);
  color: var(--text-dim);
}

/* Batch Status Indicator */
.batch-status-box {
  background-color: var(--color-primary-bg);
  border: 1px solid rgba(6, 182, 212, 0.25);
  border-radius: var(--radius-md);
  padding: 0.75rem 1rem;
}

.batch-status-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.batch-title-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.batch-indicator-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--color-primary);
  box-shadow: 0 0 8px var(--color-primary);
}

.batch-title {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-main);
}

.batch-status-desc {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

/* Scan Chunks Details */
.scan-chunks-details {
  background-color: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.details-summary {
  padding: 0.6rem 0.85rem;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  cursor: pointer;
  background-color: var(--bg-card);
}

.chunks-list {
  padding: 0.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  max-height: 200px;
  overflow-y: auto;
}

.chunk-item {
  font-size: 0.75rem;
  font-family: var(--font-mono);
  padding: 0.4rem 0.6rem;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* Key Studio Panels */
.grid-2-cols {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}

@media (min-width: 768px) {
  .grid-2-cols {
    grid-template-columns: 1fr 1fr;
  }
}

.sub-panel {
  background-color: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1rem;
}

.sub-panel-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 0.75rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.5rem;
}

.btn-stack {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.info-row {
  display: flex;
  flex-direction: column;
  font-size: 0.8rem;
  margin-top: 0.5rem;
}

.info-label {
  color: var(--text-dim);
}

.info-value {
  color: var(--text-main);
  word-break: break-all;
}

.section-intro {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* Manual Article */
.manual-article h2 {
  font-size: 1.15rem;
  color: var(--text-main);
  margin-top: 1.25rem;
  margin-bottom: 0.5rem;
}

.manual-article h3 {
  font-size: 0.95rem;
  color: var(--color-primary);
  margin-top: 0.85rem;
  margin-bottom: 0.4rem;
}

.manual-article p, .manual-article li {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.6;
}

.manual-article ul {
  padding-left: 1.25rem;
  margin: 0.5rem 0;
}

.manual-article code {
  font-family: var(--font-mono);
  background-color: var(--bg-input);
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  border: 1px solid var(--border-color);
  color: var(--color-primary);
}

/* Modal Dialog */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  padding: 1rem;
  animation: fadeIn 0.15s ease;
}

.modal-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  max-width: 420px;
  width: 100%;
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}

.modal-header {
  padding: 0.85rem 1.25rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-title {
  font-size: 1rem;
  font-weight: 600;
}

.modal-close-btn {
  background: none;
  border: none;
  font-size: 1.5rem;
  line-height: 1;
  color: var(--text-dim);
  cursor: pointer;
}

.modal-close-btn:hover {
  color: var(--text-main);
}

.modal-body {
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

.modal-qr-box {
  width: 260px;
  height: 260px;
  background-color: #ffffff;
  border-radius: var(--radius-md);
  padding: 0.75rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

.modal-canvas {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.modal-chunk-data {
  width: 100%;
  max-height: 90px;
  overflow-y: auto;
  font-size: 0.75rem;
  font-family: var(--font-mono);
  background-color: var(--bg-input);
  border: 1px solid var(--border-color);
  padding: 0.5rem;
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  word-break: break-all;
}

.modal-footer {
  padding: 0.75rem 1.25rem;
  border-top: 1px solid var(--border-color);
  display: flex;
  justify-content: flex-end;
  gap: 0.5rem;
}

/* Toast Notifications */
.toast-container {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  z-index: 120;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  pointer-events: none;
}

.toast {
  pointer-events: auto;
  min-width: 240px;
  max-width: 360px;
  padding: 0.75rem 1rem;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  color: var(--text-main);
  font-size: 0.85rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  animation: toastIn 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.toast.toast-success {
  border-left: 4px solid var(--color-emerald);
}

.toast.toast-error {
  border-left: 4px solid var(--color-danger);
}

.toast.toast-info {
  border-left: 4px solid var(--color-primary);
}

@keyframes toastIn {
  from { opacity: 0; transform: translateY(12px) scale(0.95); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

/* Footer */
.app-footer {
  border-top: 1px solid var(--border-color);
  background-color: var(--bg-surface);
  margin-top: auto;
}

.footer-content {
  max-width: 1440px;
  margin: 0 auto;
  padding: 1rem 1.25rem;
  text-align: center;
  font-size: 0.775rem;
  color: var(--text-dim);
}

/* Responsive adjustments for mobile */
@media (max-width: 767px) {
  .header-content {
    padding: 0.75rem 1rem;
  }
  .nav-tabs {
    overflow-x: auto;
    width: 100%;
  }
  .tab-btn {
    padding: 0.4rem 0.6rem;
    font-size: 0.8rem;
  }
  .composite-controls {
    flex-direction: column;
    align-items: stretch;
  }
  .ctrl-actions {
    flex-direction: column;
  }
  .ctrl-actions .btn {
    width: 100%;
  }
  .qr-cards-grid {
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  }
}