/* ==========================================================================
   Random Number Generator Stylesheet - Calculator Archive
   Exact replica of clean reference layout (Image 1 & 2) + Comprehensive Suite,
   Fraction Arithmetic, Interactive Charts, Print Modal, & Multi-Language Support
   ========================================================================== */

:root {
  --rng-green: #2e7d32;
  --rng-green-hover: #1b5e20;
  --rng-gray-btn: #8e9ca8;
  --rng-gray-btn-hover: #788591;
  --rng-box-bg: #f4f6f9;
  --rng-box-border: #d4dde6;
  --rng-input-border: #7f9db9;
  --rng-blue-header: #2b5a88;
  --rng-blue-link: #0044aa;
  --rng-blue-hover: #002277;
  --rng-result-bg: #f0fdf4;
  --rng-result-border: #bbf7d0;
  --rng-result-text: #166534;
  --rng-font: Arial, Helvetica, sans-serif;
}

/* Page Container */
.rng-page-container {
  max-width: 1000px;
  margin: 0 auto;
  padding: 12px 16px 48px;
  font-family: var(--rng-font);
  color: #333333;
}

/* Top Utility & Breadcrumb Bar */
.rng-top-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
  padding-bottom: 6px;
  border-bottom: 1px solid #e2e8f0;
}

.rng-breadcrumbs {
  font-size: 13px;
  color: #666;
}

.rng-breadcrumbs a {
  color: var(--rng-blue-link);
  text-decoration: none;
}

.rng-breadcrumbs a:hover {
  text-decoration: underline;
}

.rng-breadcrumbs .sep {
  margin: 0 4px;
  color: #999;
}

.rng-breadcrumbs .current {
  color: #333;
  font-weight: 500;
}

.rng-top-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.rng-action-btn {
  background: #ffffff;
  border: 1px solid #cbd5e1;
  border-radius: 4px;
  padding: 4px 10px;
  font-size: 12px;
  color: #334155;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  transition: all 0.15s ease;
}

.rng-action-btn:hover {
  background: #f1f5f9;
  border-color: #94a3b8;
}

.rng-print-link {
  color: var(--rng-blue-link);
  background: none;
  border: none;
  font-size: 13px;
  cursor: pointer;
  text-decoration: underline;
  padding: 2px 6px;
}

.rng-print-link:hover {
  color: var(--rng-blue-hover);
}

/* Main Titles & Subheadings */
.rng-page-title {
  font-size: 26px;
  font-weight: 700;
  color: #0a3871;
  margin: 0 0 10px 0;
  line-height: 1.25;
}

.rng-subtitle {
  font-size: 14px;
  line-height: 1.55;
  color: #444;
  margin: 0 0 12px 0;
}

.rng-section-title {
  font-size: 20px;
  font-weight: 700;
  color: #0a3871;
  margin: 28px 0 10px 0;
  line-height: 1.3;
}

/* 2-Column Main Layout (Image 2) */
.rng-main-layout {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 32px;
  align-items: start;
}

.rng-content-col {
  min-width: 0;
}

/* Calculator Box Containers (Image 2 exact gray box clone) */
.rng-box {
  background-color: var(--rng-box-bg);
  border: 1px solid var(--rng-box-border);
  border-radius: 2px;
  padding: 16px 18px;
  margin-bottom: 20px;
}

/* Table-like Form Row Layout */
.rng-form-table {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 14px;
}

.rng-form-row {
  display: flex;
  align-items: center;
  gap: 12px;
}

.rng-form-label {
  font-size: 14px;
  color: #222;
  min-width: 90px;
  font-weight: 500;
}

.rng-form-label-wide {
  font-size: 14px;
  color: #222;
  min-width: 175px;
  font-weight: 500;
}

.rng-input {
  background: #ffffff;
  border: 1px solid var(--rng-input-border);
  padding: 5px 8px;
  font-size: 14px;
  color: #111;
  border-radius: 2px;
  font-family: inherit;
  outline: none;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.rng-input:focus {
  border-color: #2563eb;
  box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.15);
}

.rng-input-sm {
  width: 90px;
}

.rng-input-md {
  width: 140px;
}

.rng-input-lg {
  width: 220px;
}

/* Radio Button Group */
.rng-radio-group {
  display: inline-flex;
  align-items: center;
  gap: 18px;
  font-size: 14px;
  color: #333;
}

.rng-radio-label {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  cursor: pointer;
  user-select: none;
}

.rng-radio-label input[type="radio"] {
  cursor: pointer;
  accent-color: #2b5a88;
}

/* Action Buttons (Matches Reference Green "Generate ▶" and Gray "Clear") */
.rng-btn-group {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 14px;
}

.rng-btn-green {
  background-color: #38761d;
  color: #ffffff;
  border: 1px solid #2d6117;
  padding: 6px 16px;
  font-size: 14px;
  font-weight: 600;
  border-radius: 3px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: background-color 0.15s;
}

.rng-btn-green:hover {
  background-color: #2d6117;
}

.rng-btn-green:active {
  transform: translateY(1px);
}

.rng-play-icon {
  font-size: 10px;
  line-height: 1;
}

.rng-btn-gray {
  background-color: var(--rng-gray-btn);
  color: #ffffff;
  border: 1px solid #788591;
  padding: 6px 14px;
  font-size: 14px;
  font-weight: 500;
  border-radius: 3px;
  cursor: pointer;
  transition: background-color 0.15s;
}

.rng-btn-gray:hover {
  background-color: var(--rng-gray-btn-hover);
}

/* Advanced Options Toggle */
.rng-advanced-toggle {
  margin-top: 10px;
  font-size: 12.5px;
  color: var(--rng-blue-link);
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  text-decoration: underline;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.rng-advanced-panel {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px dashed #cbd5e1;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

/* Result Cards (Image 1 replica & Comprehensive Output) */
.rng-result-container {
  margin-top: 16px;
  background: var(--rng-result-bg);
  border: 1px solid var(--rng-result-border);
  border-radius: 4px;
  padding: 16px;
  transition: all 0.2s ease;
}

/* Modal Popup Replica from Image 1 */
.rng-image1-card {
  background: #ffffff;
  border: 1px solid #0a3871;
  border-radius: 6px;
  overflow: hidden;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.12);
  margin-top: 14px;
  max-width: 440px;
}

.rng-image1-header {
  background: #0a3871;
  color: #ffffff;
  padding: 8px 14px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 700;
  font-size: 15px;
}

.rng-image1-close {
  background: transparent;
  border: none;
  color: #ffffff;
  font-size: 16px;
  cursor: pointer;
  line-height: 1;
  padding: 0 4px;
}

.rng-image1-body {
  padding: 16px;
}

.rng-image1-result-box {
  background: #f0fdf4;
  border: 1px solid #bbf7d0;
  border-radius: 6px;
  padding: 14px;
  text-align: center;
  margin-top: 12px;
}

.rng-image1-number {
  font-size: 32px;
  font-weight: 800;
  color: #1e561f;
  line-height: 1.1;
  word-break: break-all;
}

/* Comprehensive Result Box */
.rng-comp-results-wrap {
  margin-top: 16px;
  background: #ffffff;
  border: 1px solid #d4dde6;
  border-radius: 4px;
  padding: 14px;
}

.rng-comp-stats-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  padding: 8px 12px;
  background: #f8fafc;
  border: 1px solid #e2e8f0;
  border-radius: 4px;
  font-size: 12.5px;
  color: #475569;
  margin-bottom: 12px;
}

.rng-stat-item strong {
  color: #0f172a;
}

.rng-numbers-scrollbox {
  max-height: 220px;
  overflow-y: auto;
  background: #fdfdfd;
  border: 1px solid #e2e8f0;
  border-radius: 4px;
  padding: 10px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 13.5px;
  line-height: 1.6;
  color: #1e293b;
  word-break: break-all;
  white-space: pre-wrap;
}

.rng-result-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-top: 10px;
}

/* Fraction Arithmetic Section Styles (Core Req 1, 5, 6) */
.rng-frac-equation {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 14px;
}

.rng-frac-stack {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  width: 54px;
}

.rng-frac-input {
  width: 100%;
  text-align: center;
  font-size: 15px;
  font-weight: 600;
  padding: 4px 2px;
  border: 1px solid var(--rng-input-border);
  border-radius: 2px;
}

.rng-frac-bar {
  width: 100%;
  height: 2px;
  background-color: #333333;
  margin: 3px 0;
  border: none;
}

.rng-frac-op {
  font-size: 18px;
  font-weight: 700;
  padding: 4px 6px;
  border: 1px solid var(--rng-input-border);
  border-radius: 2px;
  background: #ffffff;
  color: #111;
  cursor: pointer;
}

.rng-frac-eq-sym {
  font-size: 20px;
  font-weight: 700;
  color: #333;
}

.rng-frac-res-preview {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 18px;
  font-weight: 700;
  color: #1e561f;
}

.rng-frac-steps {
  background: #ffffff;
  border: 1px solid #d1fae5;
  border-radius: 4px;
  padding: 12px 14px;
  margin-top: 10px;
  font-size: 13.5px;
  line-height: 1.6;
  color: #1f2937;
}

/* Visualization Tabs & Cards (Core Req 5) */
.rng-charts-card {
  background: #ffffff;
  border: 1px solid var(--rng-box-border);
  border-radius: 4px;
  padding: 16px;
  margin: 24px 0;
}

.rng-charts-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 14px;
  border-bottom: 1px solid #e2e8f0;
  padding-bottom: 8px;
}

.rng-charts-title {
  font-size: 16px;
  font-weight: 700;
  color: #0a3871;
  display: flex;
  align-items: center;
  gap: 6px;
}

.rng-chart-tabs {
  display: flex;
  gap: 6px;
}

.rng-chart-tab {
  background: #f1f5f9;
  border: 1px solid #cbd5e1;
  border-radius: 3px;
  padding: 5px 10px;
  font-size: 12px;
  color: #475569;
  cursor: pointer;
  transition: all 0.15s ease;
}

.rng-chart-tab.active {
  background: #2b5a88;
  color: #ffffff;
  border-color: #1d4062;
  font-weight: 600;
}

.rng-chart-canvas-wrap {
  width: 100%;
  min-height: 240px;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Sidebar Column (Image 2 Exact Replica) */
.rng-sidebar-col {
  width: 100%;
}

.rng-search-form {
  display: flex;
  gap: 4px;
  margin-bottom: 24px;
  position: relative;
}

.rng-search-input {
  flex: 1;
  border: 1px solid #7f9db9;
  padding: 5px 8px;
  font-size: 13px;
  border-radius: 2px;
  outline: none;
}

.rng-search-input:focus {
  border-color: #2563eb;
}

.rng-search-btn {
  background-color: var(--rng-blue-header);
  color: #ffffff;
  border: 1px solid #1f4265;
  padding: 5px 12px;
  font-size: 13px;
  font-weight: 600;
  border-radius: 2px;
  cursor: pointer;
  transition: background-color 0.15s;
}

.rng-search-btn:hover {
  background-color: #1f4265;
}

.rng-search-dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: #ffffff;
  border: 1px solid #cbd5e1;
  border-radius: 4px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.12);
  z-index: 50;
  max-height: 280px;
  overflow-y: auto;
  display: none;
}

/* Math Calculators Card (Image 2 Replica) */
.rng-side-card {
  border: 1px solid #b8c8d8;
  border-radius: 2px;
  overflow: hidden;
  margin-bottom: 20px;
}

.rng-side-card-title {
  background-color: var(--rng-blue-header);
  color: #ffffff;
  font-size: 14px;
  font-weight: 700;
  padding: 6px 10px;
}

.rng-side-card-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  padding: 8px 10px;
  background: #ffffff;
  gap: 6px 8px;
  font-size: 12.5px;
}

.rng-side-card-grid a {
  color: var(--rng-blue-link);
  text-decoration: none;
  padding: 2px 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.rng-side-card-grid a:hover {
  text-decoration: underline;
  color: var(--rng-blue-hover);
}

.rng-side-card-grid a.active {
  font-weight: 700;
  color: #111111;
}

.rng-side-card-footer {
  border-top: 1px solid #e2e8f0;
  background: #f8fafc;
  padding: 6px 10px;
  font-size: 11.5px;
  color: #64748b;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px;
}

.rng-side-card-footer a {
  color: var(--rng-blue-link);
  text-decoration: none;
}

.rng-side-card-footer a:hover {
  text-decoration: underline;
}

.rng-side-card-footer .sep {
  color: #94a3b8;
}

/* Saved Drawer Modal */
.rng-modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.45);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 999;
  padding: 16px;
}

.rng-modal-card {
  background: #ffffff;
  border-radius: 6px;
  width: 100%;
  max-width: 540px;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  max-height: 85vh;
}

.rng-modal-header {
  background: #0a3871;
  color: #ffffff;
  padding: 10px 16px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.rng-modal-title {
  font-size: 16px;
  font-weight: 700;
  margin: 0;
}

.rng-modal-close {
  background: none;
  border: none;
  color: #ffffff;
  font-size: 20px;
  cursor: pointer;
  line-height: 1;
}

.rng-modal-body {
  padding: 16px;
  overflow-y: auto;
  flex: 1;
}

.rng-modal-footer {
  padding: 10px 16px;
  background: #f8fafc;
  border-top: 1px solid #e2e8f0;
  display: flex;
  justify-content: flex-end;
  gap: 8px;
}

/* Saved Item Row */
.rng-saved-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 12px;
  border-bottom: 1px solid #e2e8f0;
  font-size: 13px;
}

.rng-saved-item:hover {
  background: #f8fafc;
}

.rng-saved-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.rng-saved-time {
  font-size: 11px;
  color: #64748b;
}

.rng-saved-actions {
  display: flex;
  gap: 6px;
}

/* Toast */
.rng-toast {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background: #0f172a;
  color: #ffffff;
  padding: 8px 16px;
  border-radius: 4px;
  font-size: 13px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
  opacity: 0;
  transform: translateY(10px);
  pointer-events: none;
  transition: all 0.2s ease;
  z-index: 1000;
}

.rng-toast.show {
  opacity: 1;
  transform: translateY(0);
}

/* SEO / AEO / GEO Section Styles */
.calc-seo-section {
  margin-top: 36px;
  padding-top: 24px;
  border-top: 2px solid #e2e8f0;
  color: #334155;
  line-height: 1.7;
}

.calc-seo-section h2 {
  font-size: 22px;
  font-weight: 700;
  color: #0a3871;
  margin: 0 0 14px 0;
}

.calc-seo-section h3 {
  font-size: 18px;
  font-weight: 700;
  color: #1e293b;
  margin: 24px 0 10px 0;
}

.calc-seo-section p {
  margin: 0 0 14px 0;
  font-size: 14px;
}

.calc-seo-section ul, .calc-seo-section ol {
  margin: 0 0 16px 20px;
  padding: 0;
  font-size: 14px;
}

.calc-seo-section li {
  margin-bottom: 6px;
}

.seo-formula-box {
  background: #f8fafc;
  border-left: 4px solid #0a3871;
  padding: 12px 16px;
  margin: 16px 0;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 13px;
  line-height: 1.6;
}

.seo-aeo-card {
  background: #ffffff;
  border: 1px solid #cbd5e1;
  border-radius: 4px;
  padding: 14px 16px;
  margin: 16px 0;
  box-shadow: 0 1px 3px rgba(0,0,0,0.04);
}

.aeo-q {
  font-weight: 700;
  color: #0a3871;
  font-size: 14.5px;
  margin-bottom: 6px;
}

.aeo-a {
  font-size: 13.5px;
  color: #334155;
  line-height: 1.6;
}

.geo-insight-box {
  background: #f0fdf4;
  border: 1px solid #bbf7d0;
  border-radius: 4px;
  padding: 14px 16px;
  margin: 16px 0;
}

.geo-title {
  font-weight: 700;
  color: #166534;
  font-size: 14.5px;
  margin-bottom: 6px;
}

.seo-table-wrap {
  overflow-x: auto;
  margin: 16px 0;
}

.seo-summary-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}

.seo-summary-table th {
  background: #0a3871;
  color: #ffffff;
  text-align: left;
  padding: 8px 12px;
  font-weight: 600;
}

.seo-summary-table td {
  padding: 8px 12px;
  border-bottom: 1px solid #e2e8f0;
}

.seo-summary-table tr:nth-child(even) td {
  background: #f8fafc;
}

/* FAQ Accordion */
.seo-faq-item {
  border-bottom: 1px solid #e2e8f0;
  padding: 10px 0;
}

.seo-faq-q {
  font-weight: 600;
  color: #0a3871;
  font-size: 14.5px;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.seo-faq-a {
  margin-top: 8px;
  font-size: 13.5px;
  color: #475569;
  line-height: 1.6;
}

/* Print Formatting */
@media print {
  body {
    background: #ffffff !important;
    color: #000000 !important;
  }
  .site-header, .site-footer, .rng-sidebar-col, .rng-top-actions, .rng-btn-group, .rng-chart-tabs, .rng-modal-backdrop, .rng-toast {
    display: none !important;
  }
  .rng-page-container {
    max-width: 100% !important;
    padding: 0 !important;
    margin: 0 !important;
  }
  .rng-main-layout {
    grid-template-columns: 1fr !important;
  }
  .rng-box, .rng-result-container, .rng-comp-results-wrap {
    border: 1px solid #000000 !important;
    box-shadow: none !important;
    break-inside: avoid;
  }
}

/* Responsive Media Queries */
@media (max-width: 768px) {
  .rng-main-layout {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  .rng-sidebar-col {
    margin-top: 20px;
  }
  .rng-form-row {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
  }
  .rng-form-label, .rng-form-label-wide {
    min-width: unset;
  }
}