/* ============================================
   Microsoft Fabric Best Practices Guide
   Light-mode & Dark-mode Technical Documentation Theme
   ============================================ */

/* --- CSS Variables (Microsoft Fabric Brand Palette — Light) --- */
:root {
  --bg-primary: #ffffff;
  --bg-secondary: #f5f5f5;
  --bg-tertiary: #f0f0f0;
  --bg-card: #ffffff;
  --bg-code: #f4f4f8;
  --bg-hover: #e8e8ec;
  --bg-sidebar: #fafafa;
  --border-color: #e0e0e0;
  --border-accent: #0078D4;
  --text-primary: #1b1b1f;
  --text-secondary: #555566;
  --text-muted: #888899;
  --accent-blue: #0078D4;
  --accent-purple: #8661C5;
  --accent-green: #498205;
  --accent-orange: #DA3B01;
  --accent-red: #D13438;
  --accent-cyan: #038387;
  --fabric-orange: #F25022;
  --fabric-yellow: #FFB900;
  --fabric-blue: #0078D4;
  --fabric-green: #7FBA00;
  --fabric-teal: #038387;
  --bronze: #a05c1a;
  --silver: #6e6e6e;
  --gold: #c19c00;
  --font-sans: 'Segoe UI', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'Cascadia Code', 'Fira Code', 'Consolas', monospace;
  --sidebar-width: 280px;
  --header-height: 60px;
  --transition: 0.2s ease;
}

/* --- Dark Mode --- */
[data-theme="dark"] {
  --bg-primary: #1a1a2e;
  --bg-secondary: #16213e;
  --bg-tertiary: #1f2b47;
  --bg-card: #1e2a45;
  --bg-code: #162033;
  --bg-hover: #253555;
  --bg-sidebar: #141c30;
  --border-color: #2a3a5c;
  --border-accent: #4ba5f5;
  --text-primary: #e8eaf0;
  --text-secondary: #a8b2c8;
  --text-muted: #6b7a9a;
  --accent-blue: #4ba5f5;
  --accent-purple: #b47cff;
  --accent-green: #7FBA00;
  --accent-orange: #ff8c42;
  --accent-red: #ff6b6b;
  --accent-cyan: #20d6e3;
  --bronze: #d4874d;
  --silver: #9ca3af;
  --gold: #f0d060;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 20px);
}

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

/* --- Scrollbar --- */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb { background: var(--border-color); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

/* --- Header --- */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  padding: 0 24px;
  z-index: 1000;
  backdrop-filter: blur(12px);
  background: rgba(255, 255, 255, 0.92);
}

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

.header-logo svg {
  width: 28px;
  height: 28px;
}

.header-logo span {
  font-size: 18px;
  font-weight: 600;
  letter-spacing: -0.3px;
}

.header-logo .subtitle {
  font-size: 13px;
  font-weight: 400;
  color: var(--text-secondary);
  margin-left: 4px;
}

/* --- Search Bar --- */
.search-wrapper {
  position: relative;
  display: flex;
  align-items: center;
  margin-left: auto;
  margin-right: 16px;
  max-width: 340px;
  flex: 1;
}

.search-icon {
  position: absolute;
  left: 10px;
  width: 16px;
  height: 16px;
  color: var(--text-muted);
  pointer-events: none;
}

.search-input {
  width: 100%;
  padding: 7px 12px 7px 34px;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  background: var(--bg-primary);
  color: var(--text-primary);
  font-size: 13px;
  font-family: var(--font-sans);
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.search-input::placeholder {
  color: var(--text-muted);
}

.search-input:focus {
  border-color: var(--accent-blue);
  box-shadow: 0 0 0 3px rgba(0, 120, 212, 0.12);
}

.search-kbd {
  position: absolute;
  right: 8px;
  padding: 2px 6px;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  font-size: 11px;
  font-family: var(--font-sans);
  color: var(--text-muted);
  background: var(--bg-secondary);
  pointer-events: none;
  line-height: 1.4;
}

.search-input:focus ~ .search-kbd {
  display: none;
}

.search-results {
  display: none;
  position: absolute;
  top: calc(100% + 6px);
  left: 0;
  right: 0;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.12);
  max-height: 400px;
  overflow-y: auto;
  z-index: 1100;
}

.search-results.visible {
  display: block;
}

.search-result-item {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 10px 14px;
  text-decoration: none;
  color: var(--text-primary);
  font-size: 13px;
  border-bottom: 1px solid var(--border-color);
  transition: background var(--transition);
}

.search-result-item:last-child {
  border-bottom: none;
}

.search-result-item:hover,
.search-result-item.selected {
  background: var(--bg-hover);
}

.search-result-item strong {
  white-space: nowrap;
}

.search-result-item span {
  color: var(--text-muted);
  font-size: 12px;
  margin-left: auto;
  white-space: nowrap;
}

.search-no-results {
  padding: 16px;
  text-align: center;
  color: var(--text-muted);
  font-size: 13px;
}

/* --- Active Page Group (page + TOC sections) --- */
.nav-item-expanded {
  background: rgba(0, 120, 212, 0.04);
  border-radius: 8px;
  margin: 4px 10px;
  overflow: hidden;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.06);
  border: 1px solid rgba(0, 120, 212, 0.12);
}

.nav-item-expanded > a {
  padding-left: 14px;
}

.nav-item-expanded > a.active {
  border-left: none;
  border-radius: 8px 8px 0 0;
  background: rgba(0, 120, 212, 0.10);
}

/* --- TOC (Table of Contents in sidebar) --- */
.toc-list {
  list-style: none;
  padding: 0 0 6px 0;
  margin: 0;
  border-top: 1px solid rgba(0, 120, 212, 0.10);
}

.toc-list li {
  margin: 0;
}

.toc-link {
  display: block;
  padding: 5px 14px 5px 32px;
  font-size: 12px;
  color: var(--text-muted);
  text-decoration: none;
  border-left: none;
  transition: all var(--transition);
  line-height: 1.5;
}

.toc-link:hover {
  color: var(--text-primary);
  background: rgba(0, 120, 212, 0.06);
}

.toc-link.active {
  color: var(--accent-blue);
  font-weight: 600;
  background: rgba(0, 120, 212, 0.08);
  border-right: 3px solid var(--accent-blue);
}

.hamburger {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  cursor: pointer;
  padding: 8px;
  margin-left: auto;
}

.hamburger svg {
  width: 24px;
  height: 24px;
}

/* --- Sidebar --- */
.sidebar {
  position: fixed;
  top: var(--header-height);
  left: 0;
  width: var(--sidebar-width);
  height: calc(100vh - var(--header-height));
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border-color);
  overflow-y: auto;
  padding: 20px 0;
  z-index: 900;
  transition: transform var(--transition);
}

.sidebar-nav {
  list-style: none;
}

.sidebar-nav li {
  position: relative;
}

.sidebar-nav a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 20px;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 14px;
  transition: all var(--transition);
  border-left: 2px solid transparent;
}

.sidebar-nav a:hover {
  color: var(--text-primary);
  background: var(--bg-hover);
}

.sidebar-nav a.active {
  color: var(--accent-blue);
  border-left-color: var(--accent-blue);
  background: rgba(0, 120, 212, 0.07);
  font-weight: 600;
}

.sidebar-nav .nav-icon {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  opacity: 0.7;
}

.sidebar-nav a.active .nav-icon {
  opacity: 1;
}

.sidebar-section-label {
  padding: 16px 20px 6px;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-muted);
}

/* --- Main Content --- */
.main-content {
  margin-left: var(--sidebar-width);
  margin-top: var(--header-height);
  padding: 40px 60px 80px;
  max-width: calc(1200px + 120px);
  margin-right: auto;
  margin-left: calc(var(--sidebar-width) + max(0px, (100vw - var(--sidebar-width) - 1200px - 120px) / 2));
}

/* --- Section Styling --- */
.section {
  margin-bottom: 64px;
  padding-top: 56px;
  position: relative;
}

.section::before {
  content: '';
  display: block;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--accent-blue), var(--accent-purple), var(--accent-cyan));
  border-radius: 2px;
  margin-bottom: 40px;
}

.section:first-of-type {
  padding-top: 16px;
}

.section:first-of-type::before {
  display: none;
}

.section-header {
  margin-bottom: 32px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-color);
}

.section-number {
  display: inline-block;
  font-size: 11px;
  font-weight: 700;
  color: var(--accent-blue);
  text-transform: uppercase;
  letter-spacing: 1.5px;
  margin-bottom: 10px;
  padding: 4px 12px;
  background: rgba(0, 120, 212, 0.08);
  border-radius: 4px;
}

.section h2 {
  font-size: 28px;
  font-weight: 700;
  letter-spacing: -0.5px;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.section-subtitle {
  font-size: 16px;
  color: var(--text-secondary);
  line-height: 1.5;
}

.section h3 {
  font-size: 20px;
  font-weight: 600;
  margin: 32px 0 16px;
  color: var(--text-primary);
}

.section h4 {
  font-size: 16px;
  font-weight: 600;
  margin: 24px 0 12px;
  color: var(--text-primary);
}

.section p {
  margin-bottom: 16px;
  color: var(--text-secondary);
  line-height: 1.8;
}

.section ul, .section ol {
  margin: 12px 0 20px 24px;
  color: var(--text-secondary);
}

.section li {
  margin-bottom: 8px;
  line-height: 1.6;
}

.section li strong {
  color: var(--text-primary);
}

/* --- Hero Section --- */
.hero {
  text-align: center;
  padding: 48px 0 64px;
  margin-bottom: 48px;
  border-bottom: 1px solid var(--border-color);
}

.hero h1 {
  font-size: 40px;
  font-weight: 800;
  letter-spacing: -1px;
  margin-bottom: 16px;
  background: linear-gradient(135deg, var(--fabric-orange), #C4500A, var(--fabric-blue), var(--fabric-teal));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero .tagline {
  font-size: 18px;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 24px;
  line-height: 1.6;
}

.hero-badges {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 500;
  border: 1px solid var(--border-color);
  background: var(--bg-secondary);
  color: var(--text-secondary);
}

.badge svg { width: 14px; height: 14px; }

/* --- Cards --- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 16px;
  margin: 20px 0;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 20px;
  transition: border-color var(--transition), box-shadow var(--transition);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
}

.card:hover {
  border-color: var(--accent-blue);
}

.card-icon {
  width: 36px;
  height: 36px;
  margin-bottom: 12px;
  color: var(--accent-blue);
}

.card h4 {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.card p {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 0;
}

/* --- Info Boxes --- */
.info-box {
  border-radius: 8px;
  padding: 16px 20px;
  margin: 20px 0;
  border-left: 4px solid;
  font-size: 14px;
}

.info-box.tip {
  background: rgba(127, 186, 0, 0.1);
  border-color: var(--accent-green);
}

.info-box.warning {
  background: rgba(242, 80, 34, 0.1);
  border-color: var(--accent-orange);
}

.info-box.important {
  background: rgba(0, 120, 212, 0.1);
  border-color: var(--accent-blue);
}

.info-box.danger {
  background: rgba(248, 81, 73, 0.08);
  border-color: var(--accent-red);
}

.info-box-title {
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.info-box p {
  margin-bottom: 0;
  color: var(--text-secondary);
}

/* --- Code Blocks --- */
.code-block {
  position: relative;
  background: var(--bg-code);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  margin: 16px 0;
  overflow: hidden;
}

.code-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 16px;
  background: var(--bg-tertiary);
  border-bottom: 1px solid var(--border-color);
  font-size: 12px;
  color: var(--text-muted);
}

.code-copy-btn {
  background: none;
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  cursor: pointer;
  padding: 4px 10px;
  border-radius: 4px;
  font-size: 12px;
  transition: all var(--transition);
}

.code-copy-btn:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.code-block pre {
  padding: 16px;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.6;
  color: var(--text-primary);
}

code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background: var(--bg-code);
  padding: 2px 6px;
  border-radius: 4px;
  color: var(--accent-cyan);
}

/* --- Tables --- */
.table-wrapper {
  overflow-x: auto;
  margin: 20px 0;
  border: 1px solid var(--border-color);
  border-radius: 8px;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

thead {
  background: var(--bg-tertiary);
}

th {
  padding: 12px 16px;
  text-align: left;
  font-weight: 600;
  color: var(--text-primary);
  border-bottom: 1px solid var(--border-color);
  white-space: nowrap;
}

td {
  padding: 10px 16px;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border-color);
}

tr:last-child td {
  border-bottom: none;
}

tr:hover td {
  background: var(--bg-hover);
}

/* --- Diagrams --- */
.diagram-container {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 32px;
  margin: 24px 0;
  overflow-x: auto;
  text-align: center;
}

.diagram-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 20px;
}

/* Medallion Diagram */
.medallion-flow {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
  flex-wrap: wrap;
  padding: 10px 0;
}

.medallion-layer {
  display: flex;
  flex-direction: column;
  align-items: center;
  min-width: 180px;
}

.layer-circle {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  border: 3px solid;
  transition: transform var(--transition);
}

.layer-circle:hover {
  transform: scale(1.05);
}

.layer-circle.bronze {
  border-color: var(--bronze);
  background: rgba(205, 127, 50, 0.1);
}

.layer-circle.silver {
  border-color: var(--silver);
  background: rgba(192, 192, 192, 0.1);
}

.layer-circle.gold {
  border-color: var(--gold);
  background: rgba(255, 215, 0, 0.1);
}

.layer-name {
  font-size: 16px;
  font-weight: 700;
}

.layer-sub {
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 2px;
}

.layer-desc {
  margin-top: 12px;
  font-size: 12px;
  color: var(--text-secondary);
  max-width: 160px;
  text-align: center;
  line-height: 1.4;
}

.flow-arrow {
  font-size: 28px;
  color: var(--text-muted);
  margin: 0 8px;
  flex-shrink: 0;
}

/* Architecture Diagram */
.arch-diagram {
  display: flex;
  flex-direction: column;
  gap: 16px;
  align-items: center;
}

.arch-layer {
  width: 100%;
  max-width: 700px;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 16px;
  background: var(--bg-tertiary);
}

.arch-layer-title {
  font-size: 12px;
  font-weight: 600;
  color: var(--accent-blue);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 12px;
}

.arch-services {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: center;
}

.arch-service {
  padding: 8px 14px;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  font-size: 13px;
  color: var(--text-secondary);
  white-space: nowrap;
}

.arch-connector {
  color: var(--text-muted);
  font-size: 20px;
}

/* Pipeline Diagram */
.pipeline-flow {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
  flex-wrap: wrap;
  padding: 10px 0;
}

.pipeline-stage {
  display: flex;
  flex-direction: column;
  align-items: center;
  min-width: 140px;
}

.stage-box {
  width: 120px;
  padding: 16px 12px;
  border: 2px solid var(--border-color);
  border-radius: 8px;
  background: var(--bg-tertiary);
  text-align: center;
  transition: all var(--transition);
}

.stage-box:hover {
  border-color: var(--accent-blue);
}

.stage-box .stage-icon {
  font-size: 24px;
  margin-bottom: 8px;
}

.stage-box .stage-name {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-primary);
}

.stage-desc {
  margin-top: 8px;
  font-size: 11px;
  color: var(--text-muted);
  max-width: 120px;
  text-align: center;
}

.pipeline-arrow {
  font-size: 24px;
  color: var(--accent-blue);
  margin: 0 6px;
  flex-shrink: 0;
}

/* --- Checklist --- */
.checklist {
  list-style: none;
  margin: 0;
  padding: 0;
}

.checklist-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 12px 16px;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  margin-bottom: 8px;
  transition: all var(--transition);
  cursor: pointer;
}

.checklist-item:hover {
  border-color: var(--accent-blue);
  background: var(--bg-hover);
}

.checklist-item.checked {
  border-color: var(--accent-green);
  background: rgba(127, 186, 0, 0.07);
}

.checklist-item input[type="checkbox"] {
  appearance: none;
  -webkit-appearance: none;
  width: 20px;
  height: 20px;
  border: 2px solid var(--border-color);
  border-radius: 4px;
  cursor: pointer;
  flex-shrink: 0;
  margin-top: 2px;
  position: relative;
  transition: all var(--transition);
}

.checklist-item input[type="checkbox"]:checked {
  background: var(--accent-green);
  border-color: var(--accent-green);
}

.checklist-item input[type="checkbox"]:checked::after {
  content: '✓';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: white;
  font-size: 14px;
  font-weight: 700;
}

.checklist-label {
  font-size: 14px;
  color: var(--text-primary);
}

.checklist-label small {
  display: block;
  color: var(--text-muted);
  font-size: 12px;
  margin-top: 2px;
}

.checklist-item.checked .checklist-label {
  text-decoration: line-through;
  color: var(--text-muted);
}

.checklist-progress {
  margin-bottom: 20px;
}

.progress-bar {
  height: 6px;
  background: var(--bg-tertiary);
  border-radius: 3px;
  overflow: hidden;
  margin-top: 8px;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent-blue), var(--accent-green));
  border-radius: 3px;
  transition: width 0.4s ease;
}

.progress-text {
  font-size: 13px;
  color: var(--text-secondary);
}

/* --- Tags/Labels --- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 10px;
  border-radius: 12px;
  font-size: 12px;
  font-weight: 500;
}

.tag-blue { background: rgba(0, 120, 212, 0.18); color: var(--accent-blue); }
.tag-green { background: rgba(127, 186, 0, 0.18); color: var(--accent-green); }
.tag-orange { background: rgba(242, 80, 34, 0.18); color: var(--accent-orange); }
.tag-purple { background: rgba(180, 124, 255, 0.18); color: var(--accent-purple); }
.tag-red { background: rgba(242, 80, 34, 0.18); color: var(--accent-red); }
.tag-cyan { background: rgba(3, 131, 135, 0.18); color: var(--accent-cyan); }

/* --- Links --- */
a {
  color: var(--accent-blue);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover {
  color: var(--accent-purple);
  text-decoration: underline;
}

/* --- External Link --- */
.ext-link::after {
  content: ' ↗';
  font-size: 0.8em;
}

/* --- Back to Top --- */
.back-to-top {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 40px;
  height: 40px;
  border-radius: 8px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transform: translateY(10px);
  transition: all var(--transition);
  z-index: 500;
}

.back-to-top.visible {
  opacity: 1;
  transform: translateY(0);
}

.back-to-top:hover {
  color: var(--accent-blue);
  border-color: var(--accent-blue);
}

/* --- Responsive --- */
@media (max-width: 1024px) {
  .main-content {
    padding: 32px 24px 80px;
    max-width: none;
    margin-left: var(--sidebar-width);
    margin-right: 0;
  }
}

@media (max-width: 768px) {
  .sidebar {
    transform: translateX(-100%);
  }

  .sidebar.open {
    transform: translateX(0);
    box-shadow: 4px 0 20px rgba(0, 0, 0, 0.15);
  }

  .main-content {
    margin-left: 0;
    margin-right: 0;
    max-width: none;
    padding: 24px 16px 80px;
  }

  .hamburger {
    display: block;
  }

  .hero h1 {
    font-size: 28px;
  }

  .hero .tagline {
    font-size: 15px;
  }

  .card-grid {
    grid-template-columns: 1fr;
  }

  .medallion-flow, .pipeline-flow {
    flex-direction: column;
  }

  .flow-arrow, .pipeline-arrow {
    transform: rotate(90deg);
    margin: 4px 0;
  }

  .layer-circle {
    width: 100px;
    height: 100px;
  }

  .section h2 {
    font-size: 22px;
  }

  .journey-grid {
    grid-template-columns: 1fr;
  }

  .search-wrapper {
    max-width: 200px;
  }

  .search-kbd {
    display: none;
  }

  .nav-item-expanded {
    margin: 4px 6px;
  }
}

@media (max-width: 480px) {
  .header-logo .subtitle {
    display: none;
  }

  .search-wrapper {
    max-width: 140px;
  }
}

/* ============================================
   Customer Journey Cards
   ============================================ */
.journey-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 20px;
  margin: 20px 0;
}

.journey-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 24px;
  transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
}

.journey-card:hover {
  border-color: var(--accent-blue);
}

.journey-card.expanded:hover {
  transform: translateY(-2px);
}

.journey-card-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom: none;
  cursor: pointer;
  user-select: none;
}

.journey-card.expanded .journey-card-header {
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-color);
}

.journey-card-header .journey-chevron {
  margin-left: auto;
  font-size: 18px;
  color: var(--text-muted);
  transition: transform var(--transition);
}

.journey-card.expanded .journey-card-header .journey-chevron {
  transform: rotate(180deg);
}

.journey-card-body {
  display: none;
}

.journey-card.expanded .journey-card-body {
  display: block;
}

.journey-icon {
  font-size: 32px;
  line-height: 1;
}

.journey-card-header h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0 0 4px;
}

.journey-challenges,
.journey-solutions {
  margin-bottom: 16px;
}

.journey-challenges h4,
.journey-solutions h4,
.journey-links h4 {
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-muted);
  margin: 0 0 8px;
}

.journey-challenges ul,
.journey-solutions ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.journey-challenges li,
.journey-solutions li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 6px;
}

.journey-challenges li::before {
  content: '✗';
  position: absolute;
  left: 0;
  color: var(--accent-red);
  font-weight: 600;
  font-size: 12px;
}

.journey-solutions li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--accent-green);
  font-weight: 600;
  font-size: 12px;
}

.journey-links {
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--border-color);
}

.journey-link {
  display: inline-block;
  padding: 5px 14px;
  margin: 4px 4px 4px 0;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  font-size: 13px;
  color: var(--accent-blue);
  text-decoration: none;
  transition: all var(--transition);
}

.journey-link:hover {
  background: var(--bg-hover);
  border-color: var(--accent-blue);
  text-decoration: none;
}

/* Page Navigation Cards */
.page-nav-grid {
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.page-nav-card {
  text-decoration: none;
  display: block;
  transition: border-color var(--transition), transform var(--transition);
}

.page-nav-card:hover {
  transform: translateY(-2px);
  text-decoration: none;
}

.page-nav-card:hover h4 {
  color: var(--accent-blue);
}

.page-nav-sections {
  display: inline-block;
  margin-top: 8px;
  font-size: 11px;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* --- Start Here Banner --- */
.start-here-banner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 20px 28px;
  margin: 0 auto 32px;
  max-width: 900px;
  background: rgba(0, 120, 212, 0.1);
  border: 1px solid rgba(0, 120, 212, 0.3);
  border-radius: 12px;
}

.start-here-content {
  display: flex;
  align-items: center;
  gap: 16px;
}

.start-here-icon {
  font-size: 28px;
  flex-shrink: 0;
}

.start-here-content strong {
  display: block;
  font-size: 15px;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.start-here-content p {
  font-size: 13px;
  color: var(--text-secondary);
  margin: 0;
  line-height: 1.5;
}

.start-here-btn {
  flex-shrink: 0;
  padding: 10px 24px;
  background: var(--accent-blue);
  color: #fff;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  white-space: nowrap;
  transition: background var(--transition), transform var(--transition);
}

.start-here-btn:hover {
  background: #3BAFE8;
  transform: translateY(-1px);
  text-decoration: none;
}

@media (max-width: 640px) {
  .start-here-banner {
    flex-direction: column;
    text-align: center;
    padding: 16px 20px;
  }
  .start-here-content {
    flex-direction: column;
  }
  .start-here-btn {
    width: 100%;
    text-align: center;
  }
}

/* --- Overlay (mobile sidebar) --- */
.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 850;
}

.sidebar-overlay.active {
  display: block;
}

/* --- Site Footer --- */
.site-footer {
  margin-top: 60px;
  padding: 24px 0;
  border-top: 1px solid var(--border-color);
  text-align: center;
}

.footer-content p {
  font-size: 13px;
  color: var(--text-muted);
  margin: 0;
  line-height: 1.6;
}

.footer-content a {
  color: var(--accent-blue);
  text-decoration: none;
}

.footer-content a:hover {
  text-decoration: underline;
}

/* --- Print Styles --- */
@media print {
  .header, .sidebar, .back-to-top, .hamburger {
    display: none !important;
  }
  .main-content {
    margin-left: 0;
    padding: 0;
  }
  body {
    background: white;
    color: #1a1a1a;
  }
}

/* ============================================
   Data Mesh Interactive Diagram
   ============================================ */
.datamesh-diagram-container {
  padding: 24px 16px;
  position: relative;
}

.datamesh-svg {
  width: 100%;
  max-width: 800px;
  height: auto;
  margin: 0 auto;
  display: block;
}

/* Legend */
.datamesh-legend {
  display: flex;
  gap: 20px;
  justify-content: center;
  margin-bottom: 16px;
  flex-wrap: wrap;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: var(--text-muted);
}

.legend-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.legend-dot--producer { background: var(--accent-blue); }
.legend-dot--consumer { background: var(--accent-green); }
.legend-dot--bidirectional { background: var(--accent-purple); }

/* Domain Nodes */
.domain-node {
  cursor: pointer;
  transition: opacity 0.3s ease;
}

.domain-node .node-bg {
  fill: var(--bg-tertiary);
  stroke: none;
}

.domain-node .node-ring {
  fill: none;
  stroke-width: 2.5;
  transition: stroke-width 0.3s ease, filter 0.3s ease;
}

.domain-node:hover .node-ring {
  stroke-width: 4;
}

.domain-node.active .node-ring {
  stroke-width: 4;
  filter: url(#glow-blue);
}

.domain-node .node-label {
  fill: var(--text-primary);
  font-size: 13px;
  font-weight: 600;
  font-family: var(--font-sans);
}

.domain-node .node-sub {
  fill: var(--text-muted);
  font-size: 10px;
  font-family: var(--font-sans);
}

.domain-node .node-icon {
  font-family: 'Segoe UI Emoji', 'Apple Color Emoji', sans-serif;
}

.domain-node.dimmed {
  opacity: 0.2;
}

/* Flow Paths */
.flow-path {
  transition: opacity 0.3s ease, stroke-width 0.3s ease;
}

.flow-path.dimmed {
  opacity: 0.08 !important;
}

.flow-path.highlighted {
  opacity: 1 !important;
  stroke-width: 3;
}

/* Animated dash animation */
@keyframes datamesh-flow {
  to { stroke-dashoffset: -28; }
}

.flow-path {
  animation: datamesh-flow 1.2s linear infinite;
}

/* Particles */
.datamesh-particle {
  r: 3;
  opacity: 0.9;
}

/* OneLake Hub */
.onelake-hub .hub-bg {
  fill: var(--bg-secondary);
  stroke: var(--border-accent);
  stroke-width: 1.5;
}

.onelake-hub .hub-label {
  fill: var(--accent-blue);
  font-size: 12px;
  font-weight: 600;
  font-family: var(--font-sans);
}

/* Detail Panel */
.datamesh-detail {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 16px 20px;
  margin-top: 16px;
  transition: opacity 0.3s ease, transform 0.3s ease;
}

.datamesh-detail.hidden {
  display: none;
}

.datamesh-detail-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
}

.datamesh-detail-close {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 20px;
  cursor: pointer;
  padding: 4px 8px;
  line-height: 1;
  border-radius: 4px;
  transition: all var(--transition);
}

.datamesh-detail-close:hover {
  color: var(--text-primary);
  background: var(--bg-hover);
}

.datamesh-detail .product-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 8px;
}

.datamesh-detail .product-tag {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 12px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  font-size: 13px;
  color: var(--text-secondary);
}

.datamesh-detail .product-tag svg {
  width: 14px;
  height: 14px;
}

.datamesh-detail .connections-info {
  margin-top: 12px;
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.6;
}

.datamesh-detail .connections-info strong {
  color: var(--text-primary);
}

/* Responsive */
@media (max-width: 768px) {
  .datamesh-svg {
    max-width: 100%;
  }
  .datamesh-legend {
    gap: 12px;
  }
}

/* Section-level reference links */
.section-links {
  margin-top: 32px;
  padding: 20px 24px;
  background: var(--bg-secondary, #f8f9fa);
  border-radius: 12px;
  border-left: 4px solid var(--accent-primary, #0078D4);
}
.section-links h4 {
  margin: 0 0 12px 0;
  font-size: 0.95rem;
  color: var(--text-secondary, #555);
}
.section-links a {
  display: inline-block;
  margin: 4px 12px 4px 0;
  padding: 4px 12px;
  font-size: 0.85rem;
  color: var(--accent-primary, #0078D4);
  background: var(--bg-primary, #fff);
  border: 1px solid var(--border-color, #e0e0e0);
  border-radius: 6px;
  text-decoration: none;
  transition: all 0.2s;
}
.section-links a:hover {
  background: var(--accent-primary, #0078D4);
  color: #fff;
  border-color: var(--accent-primary, #0078D4);
}

/* ============================================
   Interactive Features Styles
   ============================================ */

/* --- Header Controls (Dark Mode + Language) --- */
.header-controls {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-left: auto;
  margin-right: 12px;
}

.header-btn {
  background: none;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 6px 10px;
  cursor: pointer;
  color: var(--text-secondary);
  font-size: 13px;
  display: flex;
  align-items: center;
  gap: 5px;
  transition: all var(--transition);
  font-family: var(--font-sans);
  white-space: nowrap;
}

.header-btn:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
  border-color: var(--accent-blue);
}

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

.header-btn .btn-label {
  display: inline;
}

@media (max-width: 768px) {
  .header-btn .btn-label { display: none; }
  .header-controls { gap: 4px; margin-right: 4px; }
  .header-btn { padding: 6px 8px; }
}

/* --- Reading Progress Bar --- */
.reading-progress {
  position: fixed;
  top: var(--header-height);
  left: 0;
  width: 100%;
  height: 3px;
  background: transparent;
  z-index: 1100;
  pointer-events: none;
}

.reading-progress-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--accent-blue), var(--accent-purple), var(--accent-cyan));
  transition: width 0.15s ease-out;
  border-radius: 0 2px 2px 0;
}

/* Sidebar visited checkmarks */
.sidebar-nav a .visited-check {
  display: none;
  margin-left: auto;
  color: var(--accent-green);
  font-size: 12px;
  flex-shrink: 0;
}

.sidebar-nav a.visited .visited-check {
  display: inline;
}

/* --- Section Bookmarks --- */
.bookmark-btn {
  background: none;
  border: none;
  cursor: pointer;
  font-size: 18px;
  color: var(--text-muted);
  padding: 2px 6px;
  transition: all var(--transition);
  vertical-align: middle;
  margin-left: 8px;
  opacity: 0.5;
}

.bookmark-btn:hover {
  opacity: 1;
  transform: scale(1.2);
}

.bookmark-btn.bookmarked {
  color: var(--accent-orange);
  opacity: 1;
}

.bookmarks-panel {
  display: none;
  position: fixed;
  top: var(--header-height);
  right: 0;
  width: 320px;
  max-height: calc(100vh - var(--header-height));
  background: var(--bg-card);
  border-left: 1px solid var(--border-color);
  box-shadow: -4px 0 20px rgba(0,0,0,0.1);
  z-index: 1050;
  overflow-y: auto;
  padding: 20px;
}

.bookmarks-panel.open { display: block; }

.bookmarks-panel h3 {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.bookmarks-panel .close-panel {
  background: none;
  border: none;
  font-size: 20px;
  cursor: pointer;
  color: var(--text-muted);
}

.bookmark-item {
  display: block;
  padding: 10px 12px;
  margin-bottom: 8px;
  background: var(--bg-secondary);
  border-radius: 8px;
  text-decoration: none;
  color: var(--text-primary);
  font-size: 14px;
  transition: all var(--transition);
}

.bookmark-item:hover {
  background: var(--bg-hover);
  text-decoration: none;
}

.bookmark-item small {
  display: block;
  color: var(--text-muted);
  font-size: 12px;
  margin-top: 2px;
}

/* --- Capacity Calculator --- */
.calculator-container {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 28px;
  margin: 24px 0;
}

.calc-row {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}

.calc-row label {
  min-width: 200px;
  font-size: 14px;
  color: var(--text-secondary);
  font-weight: 500;
}

.calc-row input[type="range"] {
  flex: 1;
  min-width: 150px;
  accent-color: var(--accent-blue);
  height: 6px;
}

.calc-row .calc-value {
  min-width: 80px;
  text-align: right;
  font-weight: 600;
  font-size: 14px;
  color: var(--accent-blue);
  font-family: var(--font-mono);
}

.calc-result {
  margin-top: 20px;
  padding: 20px;
  background: var(--bg-secondary);
  border-radius: 10px;
  border-left: 4px solid var(--accent-blue);
}

.calc-result h4 {
  margin: 0 0 8px;
  color: var(--text-primary);
  font-size: 16px;
}

.calc-result .sku-recommendation {
  font-size: 28px;
  font-weight: 700;
  color: var(--accent-blue);
}

.calc-result .sku-details {
  font-size: 14px;
  color: var(--text-secondary);
  margin-top: 4px;
}

/* --- Wizard / Quiz Shared Styles --- */
.wizard-container, .quiz-container {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 28px;
  margin: 24px 0;
}

.wizard-step, .quiz-question {
  display: none;
}

.wizard-step.active, .quiz-question.active {
  display: block;
}

.wizard-step h4, .quiz-question h4 {
  font-size: 18px;
  color: var(--text-primary);
  margin-bottom: 16px;
}

.wizard-options, .quiz-options {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 20px;
}

.wizard-option, .quiz-option {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 18px;
  background: var(--bg-secondary);
  border: 2px solid var(--border-color);
  border-radius: 10px;
  cursor: pointer;
  font-size: 14px;
  color: var(--text-primary);
  transition: all var(--transition);
}

.wizard-option:hover, .quiz-option:hover {
  border-color: var(--accent-blue);
  background: var(--bg-hover);
}

.wizard-option.selected, .quiz-option.selected {
  border-color: var(--accent-blue);
  background: rgba(0, 120, 212, 0.08);
}

.wizard-option .option-icon, .quiz-option .option-icon {
  font-size: 22px;
  flex-shrink: 0;
}

.wizard-nav {
  display: flex;
  justify-content: space-between;
  margin-top: 16px;
}

.wizard-btn {
  padding: 10px 24px;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  background: var(--bg-tertiary);
  color: var(--text-primary);
  cursor: pointer;
  font-size: 14px;
  font-family: var(--font-sans);
  transition: all var(--transition);
}

.wizard-btn:hover { background: var(--bg-hover); }

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

.wizard-btn.primary:hover { opacity: 0.9; }

.wizard-progress {
  display: flex;
  gap: 6px;
  margin-bottom: 24px;
}

.wizard-progress-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--border-color);
  transition: background var(--transition);
}

.wizard-progress-dot.completed { background: var(--accent-green); }
.wizard-progress-dot.current { background: var(--accent-blue); }

/* Wizard/Quiz result */
.wizard-result, .quiz-result {
  padding: 24px;
  background: var(--bg-secondary);
  border-radius: 10px;
  border-left: 4px solid var(--accent-green);
}

.wizard-result h4, .quiz-result h4 {
  margin-bottom: 12px;
  color: var(--text-primary);
}

/* Quiz score display */
.quiz-score {
  font-size: 48px;
  font-weight: 700;
  color: var(--accent-blue);
  margin: 8px 0;
}

.quiz-score-label {
  font-size: 14px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
}

/* --- Copy Button on Code Blocks --- */
.code-block-wrapper {
  position: relative;
}

.code-copy-auto {
  position: absolute;
  top: 8px;
  right: 8px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 4px 10px;
  cursor: pointer;
  font-size: 12px;
  color: var(--text-muted);
  opacity: 0;
  transition: opacity var(--transition);
  font-family: var(--font-sans);
}

.code-block-wrapper:hover .code-copy-auto { opacity: 1; }
.code-copy-auto:hover { color: var(--accent-blue); border-color: var(--accent-blue); }

/* --- Interactive Architecture Tooltips --- */
.arch-tooltip-trigger {
  cursor: pointer;
  transition: all var(--transition);
  position: relative;
}

.arch-tooltip-trigger:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0,120,212,0.15);
}

.arch-popover {
  display: none;
  position: absolute;
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%);
  background: var(--bg-card);
  border: 1px solid var(--accent-blue);
  border-radius: 10px;
  padding: 16px;
  min-width: 260px;
  max-width: 340px;
  box-shadow: 0 8px 24px rgba(0,0,0,0.12);
  z-index: 100;
  text-align: left;
  margin-bottom: 8px;
}

.arch-popover.visible { display: block; }

.arch-popover h5 {
  font-size: 14px;
  font-weight: 700;
  color: var(--accent-blue);
  margin-bottom: 6px;
}

.arch-popover p {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.5;
  margin: 0;
}