/* ============================================================================
   Material Governance Condition (MGC) - Legal & Document Viewer
   Governed by APP-016 (Identity Continuity) & APP-017 (Frontend Design Governance)
   Architectural Deep Navy & Electric Cobalt Theme
   ============================================================================ */

body.viewer-body {
  background-color: var(--bg-canvas);
  color: var(--text-primary);
  font-family: var(--font-sans);
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
}

/* Reading Progress Bar (Fixed Top) */
.viewer-progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  width: 0%;
  height: 3px;
  background: linear-gradient(90deg, var(--mgc-blue), #38BDF8);
  z-index: 9999;
  transition: width 0.1s linear;
}

/* Document Shell Layout */
.viewer-layout {
  max-width: 1280px;
  margin: 0 auto;
  padding: 40px 24px 120px;
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 48px;
  align-items: start;
}

/* Sticky Sidebar */
.viewer-sidebar {
  position: sticky;
  top: 100px;
  max-height: calc(100vh - 120px);
  display: flex;
  flex-direction: column;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 20px;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--border-subtle) transparent;
}

.viewer-sidebar::-webkit-scrollbar {
  width: 4px;
}
.viewer-sidebar::-webkit-scrollbar-thumb {
  background: var(--border-subtle);
  border-radius: 2px;
}

.sidebar-doc-meta {
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-subtle);
  margin-bottom: 16px;
}

.sidebar-doc-id {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  color: #38BDF8;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 4px;
}

.sidebar-doc-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.3;
}

/* Search Box */
.sidebar-search-wrap {
  position: relative;
  margin-bottom: 16px;
}

.sidebar-search-input {
  width: 100%;
  min-height: 44px;
  background: rgba(2, 8, 23, 0.7);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 8px 12px 8px 36px;
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 0.88rem;
  transition: all var(--transition-fast);
}

.sidebar-search-input:focus {
  outline: none;
  border-color: var(--mgc-blue);
  box-shadow: 0 0 0 2px var(--mgc-blue-bg);
}

.sidebar-search-icon {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  pointer-events: none;
}

.search-match-count {
  font-size: 0.75rem;
  font-family: var(--font-mono);
  color: #38BDF8;
  margin-top: 6px;
  display: none;
}
.search-match-count.visible {
  display: block;
}

/* Table of Contents */
.sidebar-toc {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.toc-heading-label {
  font-size: 0.68rem;
  font-family: var(--font-mono);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin: 12px 0 6px;
}

.toc-link {
  display: block;
  padding: 8px 12px;
  color: var(--text-secondary);
  font-size: 0.85rem;
  text-decoration: none;
  border-radius: var(--radius-xs);
  transition: all var(--transition-fast);
  line-height: 1.4;
  border-left: 2px solid transparent;
}

.toc-link:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.04);
}

.toc-link.active {
  color: #38BDF8;
  background: var(--mgc-blue-bg);
  border-left-color: var(--mgc-blue);
  font-weight: 600;
}

/* Document Content Area */
.viewer-content {
  min-width: 0;
}

/* Front Matter Metadata Card */
.frontmatter-card {
  background: var(--bg-card);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
  padding: 32px;
  margin-bottom: 40px;
  position: relative;
  overflow: hidden;
}

.frontmatter-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--mgc-blue), #38BDF8);
}

.frontmatter-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  color: #38BDF8;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 12px;
}

.frontmatter-title {
  font-size: 2.25rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.03em;
  line-height: 1.2;
  margin-bottom: 12px;
}

.frontmatter-desc {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 24px;
}

.frontmatter-table {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
  padding-top: 20px;
  border-top: 1px solid var(--border-subtle);
}

.fm-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.fm-label {
  font-size: 0.72rem;
  font-family: var(--font-mono);
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.fm-value {
  font-size: 0.9rem;
  font-family: var(--font-mono);
  color: var(--text-primary);
  font-weight: 500;
}

/* Document Sections */
.doc-section {
  margin-bottom: 48px;
  scroll-margin-top: 100px;
}

.doc-section h2 {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.02em;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  gap: 12px;
}

.section-num {
  font-family: var(--font-mono);
  font-size: 1rem;
  color: #38BDF8;
  font-weight: 700;
}

.doc-section h3 {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--text-primary);
  margin: 28px 0 12px;
}

.doc-section p {
  font-size: 0.98rem;
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: 16px;
}

.doc-section ul, .doc-section ol {
  margin: 16px 0 20px 24px;
  color: var(--text-secondary);
  line-height: 1.75;
}

.doc-section li {
  margin-bottom: 8px;
}

.doc-section a {
  color: #38BDF8;
  text-decoration: underline;
  text-underline-offset: 3px;
}
.doc-section a:hover {
  color: #FFFFFF;
}

/* Legal Callout Statements */
.doc-statement {
  background: rgba(0, 102, 255, 0.06);
  border-left: 3px solid var(--mgc-blue);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 16px 20px;
  margin: 20px 0;
  font-size: 0.94rem;
  color: #E2E8F0;
  line-height: 1.65;
}

.doc-statement strong {
  color: #FFFFFF;
}

.doc-highlight {
  background: rgba(245, 158, 11, 0.08);
  border-left: 3px solid #F59E0B;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 16px 20px;
  margin: 20px 0;
  font-size: 0.94rem;
  color: #FEF3C7;
  line-height: 1.65;
}

.doc-legal-block {
  background: #0d0d12;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  margin: 24px 0;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.7;
  color: #94A3B8;
}

/* Back to Top Button */
.back-to-top-btn {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 44px;
  height: 44px;
  background: var(--bg-card);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  transition: all var(--transition-normal);
  z-index: 900;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.5);
}

.back-to-top-btn.visible {
  opacity: 1;
  pointer-events: auto;
}

.back-to-top-btn:hover {
  background: var(--mgc-blue);
  color: #FFFFFF;
  border-color: var(--mgc-blue);
  transform: translateY(-2px);
}

/* Search Highlights */
mark.search-highlight {
  background: rgba(245, 158, 11, 0.4);
  color: #FFFFFF;
  border-radius: 2px;
  padding: 0 2px;
}

/* Responsive adjustments */
@media (max-width: 960px) {
  .viewer-layout {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .viewer-sidebar {
    position: static;
    max-height: none;
  }
  .frontmatter-title {
    font-size: 1.85rem;
  }
}