/* ==========================================================================
   mhrx.org - Precision Technical & Human Minimalist Stylesheet
   Philosophy: Swiss Typographic Rigor, Lab-Grade Precision, Quiet Humanity
   ========================================================================== */

:root {
  /* Chromatic Palette: Monochromatic Base with Deliberate Accents */
  --bg-canvas: #fafaf9;
  --bg-surface: #ffffff;
  --bg-subtle: #f5f5f4;
  
  --ink-primary: #141413;
  --ink-secondary: #575653;
  --ink-tertiary: #8a8884;
  --ink-ghost: #b8b6b2;
  
  --border-hairline: #e7e5e4;
  --border-medium: #d6d3d1;
  --border-strong: #141413;
  
  /* Precision Accent: Deep Cypress Green */
  --accent-cypress: #1b4332;
  --accent-cypress-subtle: #edf4f0;
  --accent-cypress-border: #b7d5c5;
  
  /* Clinical Status Tints */
  --alert-cinnabar: #991b1b;
  --alert-cinnabar-subtle: #fef2f2;
  --alert-cinnabar-border: #fecaca;
  
  --alert-ochre: #854d0e;
  --alert-ochre-subtle: #fefce8;
  --alert-ochre-border: #fef08a;

  /* Typography: Dual System (Humanist Grotesque + Technical Monospace) */
  --font-sans: -apple-system, BlinkMacSystemFont, "Inter", "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, "SF Mono", "Roboto Mono", Menlo, Monaco, Consolas, monospace;

  /* Geometry & Rhythm */
  --max-content-width: 840px;
  --max-container-width: 1160px;
  --radius: 2px;
}

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

html {
  font-family: var(--font-sans);
  color: var(--ink-primary);
  background-color: var(--bg-canvas);
  line-height: 1.65;
  font-size: 16.5px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Typography Hierarchy */
h1, h2, h3, h4 {
  color: var(--ink-primary);
  font-weight: 600;
  line-height: 1.25;
  letter-spacing: -0.025em;
}

h1 {
  font-size: 2.1rem;
  margin-bottom: 0.85rem;
  letter-spacing: -0.03em;
}

h2 {
  font-size: 1.45rem;
  margin-top: 3rem;
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-hairline);
  letter-spacing: -0.02em;
}

h3 {
  font-size: 1.18rem;
  margin-top: 2rem;
  margin-bottom: 0.5rem;
}

h4 {
  font-size: 0.95rem;
  font-weight: 600;
  margin-top: 1.5rem;
  margin-bottom: 0.35rem;
}

p {
  margin-bottom: 1.25rem;
  color: var(--ink-primary);
}

p.lead {
  font-size: 1.15rem;
  line-height: 1.65;
  color: var(--ink-secondary);
  margin-bottom: 1.75rem;
}

ul, ol {
  margin-bottom: 1.25rem;
  padding-left: 1.4rem;
}

li {
  margin-bottom: 0.4rem;
  color: var(--ink-primary);
}

a {
  color: var(--ink-primary);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  transition: color 0.12s ease;
}

a:hover {
  color: var(--accent-cypress);
}

/* Monospace Utilities */
.mono-tag {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ink-tertiary);
}

.mono-idx {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--ink-secondary);
  margin-right: 0.5rem;
}

/* Layout Containers */
.container {
  width: 100%;
  max-width: var(--max-container-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

.reading-column {
  max-width: var(--max-content-width);
  margin-left: auto;
  margin-right: auto;
}

/* Safety Directive Header */
.directive-bar {
  background: var(--ink-primary);
  color: #ffffff;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.03em;
  padding: 0.45rem 1rem;
  text-align: center;
}

.directive-bar strong {
  color: #facc15;
  font-weight: 700;
}

/* Precision Minimalist Header */
.site-header {
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-hairline);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 0.65rem;
  text-decoration: none;
}

.brand-name {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--ink-primary);
}

.brand-tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--ink-tertiary);
  letter-spacing: 0.02em;
}

/* Navigation */
.nav-links {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.nav-links a {
  color: var(--ink-secondary);
  text-decoration: none;
  padding: 0.25rem 0;
}

.nav-links a:hover {
  color: var(--ink-primary);
}

.nav-links a.active {
  color: var(--accent-cypress);
  font-weight: 700;
  border-bottom: 1.5px solid var(--accent-cypress);
}

.nav-divider {
  color: var(--border-medium);
}

/* Mobile Toggle */
.mobile-btn {
  display: none;
  background: none;
  border: 1px solid var(--border-hairline);
  padding: 0.35rem 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  cursor: pointer;
  border-radius: var(--radius);
}

.mobile-menu {
  display: none;
  background: var(--bg-surface);
  border-top: 1px solid var(--border-hairline);
  padding: 1rem 1.5rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
}

.mobile-menu.is-open {
  display: block;
}

.mobile-menu ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.mobile-menu li {
  margin-bottom: 0.65rem;
}

.mobile-menu a {
  text-decoration: none;
  color: var(--ink-primary);
}

/* Precision Lead Document Block */
.document-entry {
  padding: 3rem 0 2rem;
  border-bottom: 1px solid var(--border-hairline);
  margin-bottom: 2.5rem;
}

.entry-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding-bottom: 0.75rem;
  margin-bottom: 1.5rem;
  border-bottom: 1px solid var(--border-hairline);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--ink-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Analytical Overview Frame */
.analytical-frame {
  background: var(--bg-surface);
  border: 1px solid var(--border-hairline);
  border-left: 3px solid var(--ink-primary);
  padding: 1.5rem 1.75rem;
  margin: 2rem 0;
}

.analytical-header {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--ink-secondary);
  margin-bottom: 0.65rem;
}

.analytical-frame p {
  font-size: 0.95rem;
  line-height: 1.65;
  color: var(--ink-secondary);
  margin-bottom: 0.65rem;
}

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

/* Comparative Ledger Tables */
.table-wrap {
  width: 100%;
  overflow-x: auto;
  margin: 2rem 0;
}

table.ledger-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
  line-height: 1.55;
  border-top: 1px solid var(--ink-primary);
  border-bottom: 1px solid var(--ink-primary);
}

table.ledger-table th {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.75rem 0.85rem;
  border-bottom: 1px solid var(--border-hairline);
  background: var(--bg-surface);
  text-align: left;
  color: var(--ink-secondary);
}

table.ledger-table td {
  padding: 0.75rem 0.85rem;
  border-bottom: 1px solid var(--border-hairline);
  vertical-align: top;
  color: var(--ink-primary);
}

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

table.ledger-table tr:hover td {
  background: #fbfbf9;
}

/* Technical Panels */
.panel-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.25rem;
  margin: 2rem 0;
}

.panel {
  background: var(--bg-surface);
  border: 1px solid var(--border-hairline);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
}

.panel-header {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--ink-tertiary);
  margin-bottom: 0.5rem;
}

.panel h3 {
  margin-top: 0;
  margin-bottom: 0.5rem;
  font-size: 1.15rem;
}

.panel p {
  font-size: 0.92rem;
  color: var(--ink-secondary);
  flex-grow: 1;
}

/* Callouts */
.callout {
  border: 1px solid var(--border-hairline);
  background: var(--bg-surface);
  padding: 1.25rem 1.5rem;
  margin: 1.75rem 0;
  border-radius: var(--radius);
}

.callout-warning {
  border-left: 3px solid var(--alert-cinnabar);
  background: var(--alert-cinnabar-subtle);
}

.callout-warning .callout-tag {
  color: var(--alert-cinnabar);
}

.callout-advisory {
  border-left: 3px solid var(--alert-ochre);
  background: var(--alert-ochre-subtle);
}

.callout-advisory .callout-tag {
  color: var(--alert-ochre);
}

.callout-tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.35rem;
}

.callout p {
  font-size: 0.92rem;
  color: var(--ink-primary);
  margin-bottom: 0;
  line-height: 1.6;
}

/* Buttons (Restrained, Precision, Flat) */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 0.6rem 1.15rem;
  border-radius: var(--radius);
  text-decoration: none;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all 0.12s ease;
}

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

.btn-primary:hover {
  background: #2b2b29;
  color: #ffffff;
}

.btn-outline {
  background: var(--bg-surface);
  color: var(--ink-primary);
  border-color: var(--border-hairline);
}

.btn-outline:hover {
  background: var(--bg-subtle);
  border-color: var(--border-medium);
}

/* Accordion for Technical Topics */
.accordion {
  border: 1px solid var(--border-hairline);
  background: var(--bg-surface);
  margin-bottom: 0.5rem;
}

.accordion-header {
  width: 100%;
  padding: 0.95rem 1.25rem;
  background: var(--bg-surface);
  border: none;
  text-align: left;
  font-family: var(--font-sans);
  font-size: 0.98rem;
  font-weight: 600;
  color: var(--ink-primary);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.accordion-header:hover {
  background: var(--bg-subtle);
}

.accordion-icon {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--ink-tertiary);
}

.accordion-content {
  display: none;
  padding: 0 1.25rem 1.25rem;
  font-size: 0.92rem;
  color: var(--ink-secondary);
  line-height: 1.65;
  border-top: 1px solid var(--border-hairline);
}

.accordion.is-open .accordion-content {
  display: block;
}

/* Checklist Items */
.checklist-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin: 1.5rem 0;
}

.checklist-card {
  display: flex;
  align-items: flex-start;
  gap: 0.85rem;
  background: var(--bg-surface);
  border: 1px solid var(--border-hairline);
  padding: 0.85rem 1.15rem;
  cursor: pointer;
}

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

.checklist-card input[type="checkbox"] {
  width: 1.1rem;
  height: 1.1rem;
  margin-top: 0.2rem;
  accent-color: var(--accent-cypress);
}

.checklist-card label {
  cursor: pointer;
  flex-grow: 1;
}

.checklist-title {
  font-weight: 600;
  color: var(--ink-primary);
  margin-bottom: 0.15rem;
  font-size: 0.95rem;
}

.checklist-desc {
  font-size: 0.84rem;
  color: var(--ink-secondary);
  line-height: 1.45;
}

/* Minimalist Technical Footer */
.site-footer {
  background: var(--bg-surface);
  border-top: 1px solid var(--border-hairline);
  padding: 3rem 0 2rem;
  margin-top: auto;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--ink-secondary);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.6fr repeat(3, 1fr);
  gap: 2rem;
  margin-bottom: 2.5rem;
}

.footer-brand h4 {
  font-size: 0.95rem;
  color: var(--ink-primary);
  margin-bottom: 0.5rem;
}

.footer-brand p {
  font-family: var(--font-sans);
  font-size: 0.84rem;
  color: var(--ink-secondary);
  line-height: 1.6;
}

.footer-col h5 {
  font-size: 0.72rem;
  color: var(--ink-primary);
  margin-bottom: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.footer-col ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-col li {
  margin-bottom: 0.4rem;
}

.footer-col a {
  color: var(--ink-secondary);
  text-decoration: none;
}

.footer-col a:hover {
  color: var(--ink-primary);
  text-decoration: underline;
}

.footer-bottom {
  border-top: 1px solid var(--border-hairline);
  padding-top: 1.5rem;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  color: var(--ink-tertiary);
  font-size: 0.74rem;
}

@media (max-width: 860px) {
  .nav-links {
    display: none;
  }
  .mobile-btn {
    display: block;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 640px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .entry-meta {
    flex-direction: column;
    align-items: flex-start;
  }
}