/* ==========================================================================
   CODEX WINDOWS DEVELOPER FIELD GUIDE - DESIGN SYSTEM
   Theme: Precision Dark Graphite / Cyan-Emerald Accents
   Platform: Modern Web / Shared Hosting Static Compatible
   Accessibility: WCAG 2.2 AA Compliant
   ========================================================================== */

:root {
  /* Color Palette - Dark Graphite Canvas */
  --bg-canvas: #090d12;
  --bg-surface: #0f141c;
  --bg-subtle: #151b24;
  --bg-card: #121721;
  --bg-card-hover: #18202d;
  --bg-code: #0b0f15;
  --bg-overlay: rgba(9, 13, 18, 0.85);

  /* Borders */
  --border-subtle: #1c2430;
  --border-default: #263140;
  --border-strong: #38465a;
  --border-focus: #22d3ee;

  /* Typography */
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-inverse: #090d12;
  --text-code: #e2e8f0;

  /* Accents */
  --accent-cyan: #06b6d4;
  --accent-cyan-bright: #22d3ee;
  --accent-cyan-glow: rgba(34, 211, 238, 0.15);
  --accent-emerald: #10b981;
  --accent-emerald-bright: #34d399;
  --accent-emerald-glow: rgba(16, 185, 129, 0.15);
  --accent-amber: #f59e0b;
  --accent-amber-glow: rgba(245, 158, 11, 0.15);
  --accent-rose: #f43f5e;
  --accent-rose-glow: rgba(244, 63, 94, 0.15);

  /* Fonts */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "JetBrains Mono", "Cascadia Code", "Fira Code", Menlo, Consolas, "Courier New", monospace;

  /* Layout */
  --header-height: 64px;
  --sidebar-width: 290px;
  --toc-width: 240px;
  --content-max-width: 900px;
  --page-max-width: 1560px;

  /* Radii */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-pill: 9999px;

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 250ms cubic-bezier(0.4, 0, 0.2, 1);

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px -2px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 12px 28px -4px rgba(0, 0, 0, 0.7);
  --shadow-cyan: 0 0 20px -5px rgba(34, 211, 238, 0.3);
}

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

html {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-canvas);
  background-image: 
    radial-gradient(circle at 50% 0%, rgba(34, 211, 238, 0.05) 0%, transparent 45%),
    linear-gradient(rgba(255, 255, 255, 0.015) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.015) 1px, transparent 1px);
  background-size: 100% 100%, 48px 48px, 48px 48px;
  background-position: 0 0, -1px -1px, -1px -1px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  color: var(--text-primary);
  background-color: transparent;
  overflow-x: hidden;
}

/* Accessibility Focus Ring */
:focus-visible {
  outline: 2px solid var(--accent-cyan-bright);
  outline-offset: 3px;
}

/* Skip link for screen readers & keyboard navigation */
.skip-link {
  position: absolute;
  top: -100px;
  left: 1rem;
  background: var(--accent-cyan-bright);
  color: var(--text-inverse);
  padding: 0.75rem 1.25rem;
  font-weight: 700;
  font-size: 0.875rem;
  border-radius: var(--radius-md);
  z-index: 9999;
  text-decoration: none;
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 1rem;
}

/* Visually Hidden Utility */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* Typography Defaults */
h1, h2, h3, h4, h5, h6 {
  color: var(--text-primary);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.02em;
}

h1 { font-size: clamp(2rem, 4vw, 2.75rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2rem); margin-top: 2rem; margin-bottom: 1rem; }
h3 { font-size: clamp(1.2rem, 2vw, 1.45rem); margin-top: 1.5rem; margin-bottom: 0.75rem; }
h4 { font-size: 1.1rem; margin-top: 1.25rem; margin-bottom: 0.5rem; }

p {
  color: var(--text-secondary);
  margin-bottom: 1.25rem;
  font-size: 1.03rem;
  line-height: 1.7;
}

strong {
  color: var(--text-primary);
  font-weight: 600;
}

a {
  color: var(--accent-cyan-bright);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: #7dd3fc;
  text-decoration: underline;
  text-underline-offset: 4px;
}

ul, ol {
  margin-bottom: 1.25rem;
  padding-left: 1.5rem;
  color: var(--text-secondary);
}

li {
  margin-bottom: 0.5rem;
  line-height: 1.6;
}

li::marker {
  color: var(--accent-cyan);
}

hr {
  border: 0;
  height: 1px;
  background: var(--border-default);
  margin: 2.5rem 0;
}

/* Eyebrow & Badges */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent-cyan-bright);
  margin-bottom: 0.75rem;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.25rem 0.65rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: var(--radius-pill);
  background: var(--bg-subtle);
  color: var(--text-secondary);
  border: 1px solid var(--border-default);
}

.badge-cyan {
  background: var(--accent-cyan-glow);
  color: var(--accent-cyan-bright);
  border-color: rgba(34, 211, 238, 0.3);
}

.badge-emerald {
  background: var(--accent-emerald-glow);
  color: var(--accent-emerald-bright);
  border-color: rgba(16, 185, 129, 0.3);
}

.badge-amber {
  background: var(--accent-amber-glow);
  color: var(--accent-amber);
  border-color: rgba(245, 158, 11, 0.3);
}

.badge-rose {
  background: var(--accent-rose-glow);
  color: var(--accent-rose);
  border-color: rgba(244, 63, 94, 0.3);
}

/* Global Top Navigation */
.site-header {
  position: sticky;
  top: 0;
  height: var(--header-height);
  background: rgba(9, 13, 18, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-subtle);
  z-index: 1000;
  display: flex;
  align-items: center;
}

.header-container {
  width: 100%;
  max-width: var(--page-max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--text-primary);
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
  text-decoration: none;
}

.brand:hover {
  text-decoration: none;
}

.brand-icon {
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.brand-title {
  display: flex;
  flex-direction: column;
}

.brand-title .main-title {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--text-primary);
  line-height: 1.2;
}

.brand-title .sub-title {
  font-size: 0.7rem;
  color: var(--accent-cyan-bright);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-family: var(--font-mono);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  list-style: none;
  padding: 0;
  margin: 0;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.45rem 0.85rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: all var(--transition-fast);
}

.nav-link:hover {
  color: var(--text-primary);
  background: var(--bg-subtle);
  text-decoration: none;
}

.nav-link.active {
  color: var(--accent-cyan-bright);
  background: var(--accent-cyan-glow);
  border: 1px solid rgba(34, 211, 238, 0.25);
}

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

.search-trigger-btn {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  color: var(--text-secondary);
  padding: 0.45rem 0.85rem;
  border-radius: var(--radius-md);
  font-family: var(--font-sans);
  font-size: 0.85rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.search-trigger-btn:hover {
  border-color: var(--border-strong);
  color: var(--text-primary);
  background: var(--bg-subtle);
}

.search-trigger-btn kbd {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  background: var(--bg-subtle);
  border: 1px solid var(--border-default);
  padding: 0.15rem 0.35rem;
  border-radius: var(--radius-sm);
  color: var(--text-muted);
}

.mobile-menu-btn {
  display: none;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  color: var(--text-primary);
  border-radius: var(--radius-md);
  cursor: pointer;
}

/* Global Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 600;
  padding: 0.65rem 1.25rem;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.btn:hover {
  text-decoration: none;
}

.btn-primary {
  background: var(--accent-cyan-bright);
  color: var(--text-inverse);
  box-shadow: var(--shadow-cyan);
}

.btn-primary:hover {
  background: #38bdf8;
  color: var(--text-inverse);
  transform: translateY(-1px);
}

.btn-secondary {
  background: var(--bg-subtle);
  color: var(--text-primary);
  border-color: var(--border-default);
}

.btn-secondary:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-strong);
  color: var(--text-primary);
  transform: translateY(-1px);
}

.btn-outline {
  background: transparent;
  color: var(--accent-cyan-bright);
  border-color: rgba(34, 211, 238, 0.4);
}

.btn-outline:hover {
  background: var(--accent-cyan-glow);
  border-color: var(--accent-cyan-bright);
  color: var(--accent-cyan-bright);
}

.btn-sm {
  padding: 0.35rem 0.75rem;
  font-size: 0.8rem;
  border-radius: var(--radius-sm);
}

.btn-icon {
  width: 34px;
  height: 34px;
  padding: 0;
  border-radius: var(--radius-md);
}

/* Page Shell & Layout */
.page-container {
  width: 100%;
  max-width: var(--page-max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
  flex: 1;
}

.doc-layout {
  display: flex;
  gap: 2.5rem;
  position: relative;
  align-items: flex-start;
  min-height: calc(100vh - var(--header-height));
  padding-top: 1.5rem;
  padding-bottom: 4rem;
}

/* Documentation Sidebar */
.doc-sidebar {
  width: var(--sidebar-width);
  flex-shrink: 0;
  position: sticky;
  top: calc(var(--header-height) + 1.5rem);
  max-height: calc(100vh - var(--header-height) - 3rem);
  overflow-y: auto;
  padding-right: 1rem;
  border-right: 1px solid var(--border-subtle);
  scrollbar-width: thin;
  scrollbar-color: var(--border-default) transparent;
}

.doc-sidebar::-webkit-scrollbar {
  width: 5px;
}

.doc-sidebar::-webkit-scrollbar-thumb {
  background: var(--border-default);
  border-radius: var(--radius-pill);
}

.sidebar-group {
  margin-bottom: 2rem;
}

.sidebar-title {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
  padding-left: 0.75rem;
}

.sidebar-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.sidebar-link {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.45rem 0.75rem;
  font-size: 0.875rem;
  color: var(--text-secondary);
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: all var(--transition-fast);
  border-left: 2px solid transparent;
}

.sidebar-link .num {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  flex-shrink: 0;
}

.sidebar-link:hover {
  color: var(--text-primary);
  background: var(--bg-surface);
  text-decoration: none;
}

.sidebar-link.active {
  color: var(--accent-cyan-bright);
  background: var(--accent-cyan-glow);
  border-left-color: var(--accent-cyan-bright);
  font-weight: 600;
}

.sidebar-link.active .num {
  color: var(--accent-cyan-bright);
}

/* Main Documentation Content Area */
.doc-content {
  flex: 1;
  min-width: 0;
  max-width: var(--content-max-width);
}

/* Secondary TOC Sidebar */
.doc-toc {
  width: var(--toc-width);
  flex-shrink: 0;
  position: sticky;
  top: calc(var(--header-height) + 1.5rem);
  max-height: calc(100vh - var(--header-height) - 3rem);
  overflow-y: auto;
  font-size: 0.825rem;
  border-left: 1px solid var(--border-subtle);
  padding-left: 1.25rem;
}

.toc-title {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}

.toc-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.toc-link {
  display: block;
  padding: 0.3rem 0;
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
  line-height: 1.4;
}

.toc-link:hover {
  color: var(--accent-cyan-bright);
  text-decoration: none;
}

.toc-link.active {
  color: var(--accent-cyan-bright);
  font-weight: 600;
}

/* Code Block System */
.code-block {
  background: var(--bg-code);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  margin: 1.5rem 0;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.code-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.5rem 1rem;
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-subtle);
  font-family: var(--font-mono);
  font-size: 0.75rem;
}

.code-title {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-secondary);
  font-weight: 600;
}

.code-title::before {
  content: "";
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-cyan-bright);
}

.code-copy-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  background: transparent;
  border: 1px solid var(--border-default);
  color: var(--text-secondary);
  padding: 0.25rem 0.55rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

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

.code-copy-btn.copied {
  background: var(--accent-emerald-glow);
  color: var(--accent-emerald-bright);
  border-color: rgba(16, 185, 129, 0.4);
}

pre {
  margin: 0;
  padding: 1.25rem;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  line-height: 1.6;
  color: var(--text-code);
  tab-size: 2;
}

code {
  font-family: var(--font-mono);
  font-size: 0.88em;
}

p code, li code, table code {
  background: var(--bg-subtle);
  color: var(--accent-cyan-bright);
  padding: 0.15rem 0.4rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
}

/* Callout Components */
.callout {
  padding: 1.25rem 1.5rem;
  border-radius: var(--radius-md);
  margin: 1.75rem 0;
  border-left: 4px solid var(--border-default);
  background: var(--bg-surface);
}

.callout-title {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 700;
  font-size: 0.95rem;
  margin-bottom: 0.5rem;
}

.callout p:last-child {
  margin-bottom: 0;
}

.callout-info {
  border-left-color: var(--accent-cyan-bright);
  background: rgba(6, 182, 212, 0.05);
}
.callout-info .callout-title { color: var(--accent-cyan-bright); }

.callout-success {
  border-left-color: var(--accent-emerald-bright);
  background: rgba(16, 185, 129, 0.05);
}
.callout-success .callout-title { color: var(--accent-emerald-bright); }

.callout-warning {
  border-left-color: var(--accent-amber);
  background: rgba(245, 158, 11, 0.05);
}
.callout-warning .callout-title { color: var(--accent-amber); }

.callout-danger {
  border-left-color: var(--accent-rose);
  background: rgba(244, 63, 94, 0.05);
}
.callout-danger .callout-title { color: var(--accent-rose); }

/* Do / Don't Comparison Component */
.do-dont-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
  margin: 2rem 0;
}

.do-card, .dont-card {
  border-radius: var(--radius-md);
  padding: 1.25rem;
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  display: flex;
  flex-direction: column;
}

.do-card {
  border-top: 3px solid var(--accent-emerald-bright);
}

.dont-card {
  border-top: 3px solid var(--accent-rose);
}

.do-dont-header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.do-card .do-dont-header {
  color: var(--accent-emerald-bright);
}

.dont-card .do-dont-header {
  color: var(--accent-rose);
}

.do-dont-body {
  font-size: 0.92rem;
  color: var(--text-secondary);
}

.do-dont-body pre {
  margin-top: 0.75rem;
  background: var(--bg-code);
  padding: 0.85rem;
  border-radius: var(--radius-sm);
  font-size: 0.82rem;
}

/* Interactive Workflow Pipeline Diagram */
.workflow-pipeline {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin: 2rem 0;
}

.workflow-node {
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  display: flex;
  align-items: flex-start;
  gap: 1.25rem;
  transition: all var(--transition-fast);
  cursor: pointer;
  position: relative;
}

.workflow-node:hover {
  border-color: var(--border-strong);
  background: var(--bg-card-hover);
}

.workflow-node.active {
  border-color: var(--accent-cyan-bright);
  background: var(--bg-subtle);
  box-shadow: 0 0 0 1px var(--accent-cyan-bright);
}

.workflow-step-badge {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background: var(--bg-subtle);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.85rem;
  color: var(--text-primary);
  flex-shrink: 0;
}

.workflow-node.active .workflow-step-badge {
  background: var(--accent-cyan-bright);
  color: var(--text-inverse);
  border-color: var(--accent-cyan-bright);
}

.workflow-node-content {
  flex: 1;
}

.workflow-node-title {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.35rem;
}

.workflow-node-summary {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 0;
}

.workflow-detail-panel {
  background: var(--bg-card);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  padding: 2rem;
  margin-top: 1.5rem;
}

/* Interactive Developer Tools Layout */
.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.5rem;
  margin: 2rem 0;
}

.tool-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  transition: all var(--transition-fast);
}

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

.tool-card-icon {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-cyan-glow);
  color: var(--accent-cyan-bright);
  border-radius: var(--radius-md);
  margin-bottom: 1.25rem;
}

.tool-card h3 {
  margin-top: 0;
  font-size: 1.2rem;
  margin-bottom: 0.5rem;
}

.tool-card p {
  font-size: 0.92rem;
  color: var(--text-secondary);
  flex: 1;
}

/* Form Styles for Builders */
.form-group {
  margin-bottom: 1.25rem;
}

.form-label {
  display: block;
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.4rem;
}

.form-help {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 0.4rem;
}

.form-control {
  width: 100%;
  padding: 0.65rem 0.85rem;
  background: var(--bg-subtle);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 0.9rem;
  transition: all var(--transition-fast);
}

.form-control:focus {
  outline: none;
  border-color: var(--accent-cyan-bright);
  box-shadow: 0 0 0 1px var(--accent-cyan-bright);
}

textarea.form-control {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  resize: vertical;
  min-height: 90px;
}

.form-actions {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-top: 1.5rem;
}

/* Checklist Items */
.checklist-container {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin: 1.5rem 0;
}

.checklist-item {
  display: flex;
  align-items: flex-start;
  gap: 0.85rem;
  padding: 0.85rem 1rem;
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  user-select: none;
}

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

.checklist-item input[type="checkbox"] {
  width: 18px;
  height: 18px;
  margin-top: 2px;
  accent-color: var(--accent-cyan-bright);
  cursor: pointer;
}

.checklist-label {
  font-size: 0.92rem;
  color: var(--text-primary);
  font-weight: 500;
}

.checklist-item.completed {
  border-color: rgba(16, 185, 129, 0.3);
  background: rgba(16, 185, 129, 0.04);
}

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

/* Prompt Card Library */
.prompt-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  margin: 2rem 0;
}

.prompt-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.prompt-card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
}

.prompt-card-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.25rem;
}

.prompt-card-purpose {
  font-size: 0.88rem;
  color: var(--text-secondary);
}

.prompt-use-case {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-style: italic;
  padding: 0.5rem 0.75rem;
  background: var(--bg-subtle);
  border-radius: var(--radius-sm);
  border-left: 2px solid var(--accent-cyan);
}

/* Filter Bar */
.filter-bar {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  align-items: center;
  margin: 1.5rem 0;
}

.filter-btn {
  padding: 0.4rem 0.85rem;
  font-size: 0.825rem;
  font-weight: 600;
  background: var(--bg-subtle);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-pill);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

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

.filter-btn.active {
  background: var(--accent-cyan-bright);
  color: var(--text-inverse);
  border-color: var(--accent-cyan-bright);
}

/* Modal Search Overlay */
.search-modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: var(--bg-overlay);
  backdrop-filter: blur(8px);
  z-index: 2000;
  align-items: flex-start;
  justify-content: center;
  padding-top: 10vh;
  padding-left: 1rem;
  padding-right: 1rem;
}

.search-modal.active {
  display: flex;
}

.search-container {
  width: 100%;
  max-width: 640px;
  background: var(--bg-surface);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}

.search-input-wrapper {
  display: flex;
  align-items: center;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border-default);
  gap: 0.75rem;
}

.search-input {
  flex: 1;
  background: transparent;
  border: none;
  color: var(--text-primary);
  font-size: 1.1rem;
  outline: none;
}

.search-results {
  max-height: 400px;
  overflow-y: auto;
  padding: 0.5rem;
  list-style: none;
}

.search-result-item a {
  display: block;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-md);
  text-decoration: none;
  color: var(--text-primary);
  transition: background var(--transition-fast);
}

.search-result-item a:hover,
.search-result-item a.selected {
  background: var(--bg-subtle);
  color: var(--accent-cyan-bright);
}

.search-result-title {
  font-weight: 600;
  font-size: 0.95rem;
  margin-bottom: 0.2rem;
}

.search-result-category {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

/* Mobile Drawer Navigation */
.mobile-drawer {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: var(--bg-overlay);
  z-index: 2000;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-normal);
}

.mobile-drawer.open {
  opacity: 1;
  pointer-events: auto;
}

.drawer-content {
  width: 82%;
  max-width: 320px;
  height: 100%;
  background: var(--bg-surface);
  border-right: 1px solid var(--border-default);
  padding: 1.5rem;
  overflow-y: auto;
  transform: translateX(-100%);
  transition: transform var(--transition-normal);
}

.mobile-drawer.open .drawer-content {
  transform: translateX(0);
}

.drawer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border-subtle);
}

.drawer-close-btn {
  background: transparent;
  border: 1px solid var(--border-default);
  color: var(--text-secondary);
  width: 34px;
  height: 34px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

/* Footer — shared field-guide family layout */
.site-footer {
  margin-top: 2rem;
  padding: 3rem max(24px, calc((100vw - 1376px) / 2));
  border-top: 1px solid var(--border-default);
  background: var(--bg-canvas);
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 2rem;
}

.site-footer p {
  font-size: 0.85rem;
  margin: 1rem 0;
}

.footer-wordmark {
  display: inline-flex;
  color: var(--text-primary);
  font: 700 1.3rem var(--font-mono);
  letter-spacing: 0.03em;
}

.footer-wordmark:hover { text-decoration: none; }
.site-footer p a { text-decoration: underline; text-underline-offset: 3px; }
.site-footer nav { display: grid; align-content: start; gap: 0.1rem; }
.site-footer nav a { font-size: 0.85rem; padding: 0.45rem 0; }

@media (max-width: 600px) {
  .site-footer { grid-template-columns: 1fr; padding: 2rem 1rem; }
  .site-footer > div:first-child { grid-column: auto; }
  .site-footer .footer-wordmark { font-size: 1.1rem; }
  .site-footer .eyebrow { font-size: 0.7rem; }
}

.disclaimer-banner {
  background: rgba(245, 158, 11, 0.05);
  border: 1px solid rgba(245, 158, 11, 0.2);
  padding: 1rem 1.25rem;
  border-radius: var(--radius-md);
  font-size: 0.825rem;
  color: #cbd5e1;
  line-height: 1.5;
  margin-top: 1rem;
}

/* Responsive Breakpoints */
@media (max-width: 1200px) {
  .doc-toc {
    display: none;
  }
}

@media (max-width: 900px) {
  .doc-sidebar {
    display: none;
  }
  .nav-links {
    display: none;
  }
  .mobile-menu-btn {
    display: flex;
  }
  .do-dont-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  :root {
    --header-height: 58px;
  }
  .header-container {
    padding: 0 1rem;
  }
  .page-container {
    padding: 0 1rem;
  }
  .doc-layout {
    padding-top: 1rem;
  }
  .search-trigger-btn span,
  .search-trigger-btn kbd {
    display: none;
  }
  .search-trigger-btn {
    padding: 0.5rem;
  }
  .tool-grid {
    grid-template-columns: 1fr;
  }
}

/* Reduced Motion Preference */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}