:root {
  --ar-navy: #0E283E;
  --ar-navy-2: #173C59;
  --ar-orange: #F28C28;
  --ar-orange-soft: #FFF4E8;
  --ar-bg: #FFFFFF;
  --ar-surface: #F8FAFC;
  --ar-soft: #F8FAFC;
  --ar-surface-strong: #F1F5F9;
  --ar-border: #E2E8F0;
  --ar-border-strong: #CBD5E1;
  --ar-text: #17212B;
  --ar-muted: #64748B;
  --ar-success: #23824F;
  --ar-danger: #C23B3B;
  --ar-warning: #9A5A14;
  --ar-radius: 10px;
  --ar-radius-sm: 7px;
  --ar-shadow: 0 12px 32px rgba(14, 40, 62, .07);
}

html { scroll-behavior: smooth; }
body.ar-body {
  margin: 0;
  background: var(--ar-bg);
  color: var(--ar-text);
  font-family: Roboto, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
::selection { background: rgba(242, 140, 40, .18); color: var(--ar-navy); }
a { text-underline-offset: 3px; }
a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible, summary:focus-visible {
  outline: 3px solid rgba(242, 140, 40, .32);
  outline-offset: 2px;
}

/* Layout */
.ar-shell { width: min(calc(100% - 2rem), 1160px); margin-inline: auto; }
.ar-section { padding-block: 60px; }
.ar-section--soft { background: var(--ar-surface); }
.ar-border-y { border-top: 1px solid var(--ar-border); border-bottom: 1px solid var(--ar-border); }
.ar-border-b { border-bottom: 1px solid var(--ar-border); }
.ar-divide > * + * { border-top: 1px solid var(--ar-border); }
.ar-detail-row { padding-block: 1.55rem; }

.ar-page-hero {
  padding-block: 52px;
  border-bottom: 1px solid var(--ar-border);
  background: #fff;
}
.ar-page-hero--soft { background: var(--ar-surface); }
.ar-page-title {
  color: var(--ar-navy);
  max-width: 880px;
  font-size: clamp(2.2rem, 4.8vw, 3.3rem);
  line-height: 1.06;
  font-weight: 700;
  letter-spacing: -.03em;
}
.ar-page-lede { max-width: 760px; color: var(--ar-muted); font-size: 1.05rem; line-height: 1.75; }

/* Typography */
.ar-kicker {
  color: var(--ar-muted);
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .085em;
  text-transform: uppercase;
}
.ar-heading { color: var(--ar-navy); letter-spacing: -.02em; }
.ar-copy { color: var(--ar-muted); line-height: 1.75; }
.ar-tech-label,
.ar-spec-label,
.ar-doc-control__title {
  color: var(--ar-muted);
  font-size: .7rem;
  font-weight: 800;
  letter-spacing: .075em;
  text-transform: uppercase;
}
.ar-text-link { color: var(--ar-navy); font-weight: 700; }
.ar-text-link:hover { color: var(--ar-orange); }

/* Buttons - deliberately compact, square-ish, and non-promotional */
.btn {
  min-height: 42px;
  border-radius: 8px !important;
  font-weight: 700;
  text-transform: none;
  letter-spacing: 0;
  box-shadow: none !important;
}
.btn.btn-sm { min-height: 34px; border-radius: 7px !important; }
.btn-primary { background: var(--ar-navy) !important; border-color: var(--ar-navy) !important; color: #fff !important; }
.btn-primary:hover { background: var(--ar-navy-2) !important; border-color: var(--ar-navy-2) !important; }
.btn-outline { border-color: var(--ar-border-strong) !important; color: var(--ar-navy) !important; background: #fff !important; }
.btn-outline:hover { border-color: var(--ar-navy) !important; background: var(--ar-surface) !important; color: var(--ar-navy) !important; }
.btn-ghost { color: var(--ar-navy) !important; }
.btn-ghost:hover { background: var(--ar-surface) !important; }

/* Site header */
.brand-strip { position: relative; height: 2px; background: var(--ar-navy); }
.brand-strip::before { content: ""; display: block; width: 82px; height: 2px; background: var(--ar-orange); }
.ar-site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  border-bottom: 1px solid var(--ar-border);
  background: rgba(255, 255, 255, .97);
  backdrop-filter: blur(12px);
}
.ar-navbar { min-height: 68px; display: flex; align-items: center; justify-content: space-between; gap: 1.5rem; }
.ar-brand { display: inline-flex; align-items: baseline; gap: .7rem; flex: 0 0 auto; }
.ar-brand-name { color: var(--ar-navy); font-size: 1.18rem; font-weight: 900; letter-spacing: -.03em; }
.ar-brand-name em { color: var(--ar-orange); font-style: normal; }
.ar-brand-subtitle { color: var(--ar-muted); font-size: .72rem; font-weight: 500; white-space: nowrap; }
.ar-nav-primary { display: none; align-items: center; gap: .12rem; }
.ar-nav-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding-inline: .68rem;
  color: #40505F;
  font-size: .86rem;
  font-weight: 650;
  border-radius: 6px;
}
.ar-nav-link:hover { color: var(--ar-navy); background: var(--ar-surface); }
.ar-nav-link.active { color: var(--ar-navy); }
.ar-nav-link.active::after {
  content: "";
  position: absolute;
  left: .68rem;
  right: .68rem;
  bottom: 3px;
  height: 2px;
  background: var(--ar-orange);
}
.ar-nav-actions { display: flex; align-items: center; gap: .55rem; }
.ar-nav-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 40px;
  padding-inline: .9rem;
  border: 1px solid var(--ar-navy);
  border-radius: 8px;
  background: var(--ar-navy);
  color: #fff;
  font-size: .84rem;
  font-weight: 750;
}
.ar-nav-cta:hover { background: var(--ar-navy-2); border-color: var(--ar-navy-2); }
.ar-mobile-nav { position: relative; }
.ar-mobile-nav > summary {
  list-style: none;
  width: 42px;
  height: 40px;
  display: grid;
  place-items: center;
  border: 1px solid var(--ar-border);
  border-radius: 8px;
  color: var(--ar-navy);
  cursor: pointer;
}
.ar-mobile-nav > summary::-webkit-details-marker { display: none; }
.ar-mobile-panel {
  position: absolute;
  right: 0;
  top: calc(100% + .75rem);
  width: min(320px, calc(100vw - 2rem));
  padding: .55rem;
  border: 1px solid var(--ar-border);
  border-radius: 10px;
  background: #fff;
  box-shadow: var(--ar-shadow);
}
.ar-mobile-panel a { display: block; padding: .72rem .8rem; border-radius: 6px; color: var(--ar-text); font-size: .9rem; font-weight: 600; }
.ar-mobile-panel a:hover { background: var(--ar-surface); color: var(--ar-navy); }
.ar-mobile-label { padding: .8rem .8rem .35rem; color: var(--ar-muted); font-size: .66rem; font-weight: 800; text-transform: uppercase; letter-spacing: .08em; }
.ar-mobile-divider { border-top: 1px solid var(--ar-border); margin-block: .4rem; }

/* Skip link */
.ar-skip-link { position: fixed; left: 1rem; top: -80px; z-index: 100; padding: .7rem 1rem; background: var(--ar-navy); color: #fff; border-radius: 6px; font-weight: 700; }
.ar-skip-link:focus { top: 1rem; }

/* Lists and panels */
.ar-tool-list { border-top: 1px solid var(--ar-border); }
.ar-tool-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 1rem;
  align-items: center;
  padding: 1.05rem 0;
  border-bottom: 1px solid var(--ar-border);
}
.ar-tool-row:hover .ar-tool-title { color: var(--ar-orange); }
.ar-tool-title { color: var(--ar-navy); font-weight: 750; transition: color .15s ease; }
.ar-tool-meta { color: var(--ar-muted); font-size: .84rem; margin-top: .2rem; }
.ar-arrow { color: #94A3B8; font-size: 1.05rem; }

.ar-panel { border: 1px solid var(--ar-border); background: #fff; border-radius: var(--ar-radius); }
.ar-panel-header { padding: 1.2rem 1.3rem; border-bottom: 1px solid var(--ar-border); }
.ar-panel-body { padding: 1.3rem; }

.ar-spec-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); border-top: 1px solid var(--ar-border); border-left: 1px solid var(--ar-border); }
.ar-spec { min-height: 100%; padding: 1.05rem; border-right: 1px solid var(--ar-border); border-bottom: 1px solid var(--ar-border); background: #fff; }
.ar-spec-value { color: var(--ar-navy); font-weight: 750; margin-top: .25rem; }

.ar-filter-bar { display: flex; flex-wrap: wrap; gap: .25rem; padding-block: .7rem; border-top: 1px solid var(--ar-border); border-bottom: 1px solid var(--ar-border); }
.ar-filter-link { display: inline-flex; align-items: center; min-height: 34px; padding-inline: .72rem; color: var(--ar-muted); font-size: .78rem; font-weight: 700; border-radius: 6px; }
.ar-filter-link:hover { color: var(--ar-navy); background: var(--ar-surface); }
.ar-filter-link.active { color: #fff; background: var(--ar-navy); }

/* Forms */
.ar-field { margin-bottom: 1rem; }
.ar-label { display: block; color: var(--ar-navy); font-size: .84rem; font-weight: 700; margin-bottom: .42rem; }
.ar-input, .ar-select, .form-control input, .form-control select, .form-control textarea {
  width: 100%;
  min-height: 44px;
  border: 1px solid var(--ar-border-strong);
  border-radius: 8px;
  background: #fff;
  color: var(--ar-text);
  padding: .68rem .8rem;
  outline: none;
  transition: border-color .15s ease, box-shadow .15s ease;
}
.form-control textarea { min-height: 150px; }
.ar-input:focus, .ar-select:focus, .form-control input:focus, .form-control select:focus, .form-control textarea:focus {
  border-color: var(--ar-navy);
  box-shadow: 0 0 0 3px rgba(14, 40, 62, .09);
}
.ar-help { color: var(--ar-muted); font-size: .78rem; margin-top: .4rem; }
.ar-error { color: var(--ar-danger); font-size: .8rem; margin-top: .35rem; }
.ar-error-box { margin-bottom: 1rem; padding: .75rem; border: 1px solid #F2CACA; border-radius: 8px; background: #FFF7F7; color: var(--ar-danger); font-size: .875rem; }

/* Engineering results */
.ar-result { background: var(--ar-navy); color: #fff; border-radius: var(--ar-radius); padding: 1.35rem; }
.ar-result--pass { background: #174F35; }
.ar-result--fail { background: #722F2F; }
.ar-result-label { color: rgba(255,255,255,.68); font-size: .72rem; font-weight: 800; letter-spacing: .06em; text-transform: uppercase; }
.ar-result-value { font-size: 1.95rem; font-weight: 800; letter-spacing: -.035em; margin-top: .25rem; }
.ar-result-sub { color: rgba(255,255,255,.72); font-size: .88rem; margin-top: .3rem; }
.ar-range-warning { margin-top: .9rem; padding-top: .8rem; border-top: 1px solid rgba(255,255,255,.18); color: #FDE7D1; font-size: .82rem; }
.ar-result-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: .8rem; }
.ar-result-grid div { border-top: 1px solid rgba(255,255,255,.16); padding-top: .7rem; }
.ar-result-grid span { display: block; color: rgba(255,255,255,.65); font-size: .72rem; text-transform: uppercase; letter-spacing: .05em; }
.ar-result-grid strong { display: block; margin-top: .2rem; font-size: .95rem; }
.ar-status { display: inline-flex; align-items: center; justify-content: center; min-width: 72px; padding: .42rem .62rem; border-radius: 6px; color: #fff; font-size: .72rem; font-weight: 800; letter-spacing: .04em; }
.ar-status--pass { background: var(--ar-success); }
.ar-status--fail { background: var(--ar-danger); }
.ar-inline-status { display: inline-flex; padding: .25rem .45rem; border-radius: 5px; font-size: .7rem; font-weight: 800; }
.ar-inline-status--pass { color: #166534; background: #DCFCE7; }
.ar-inline-status--fail { color: #991B1B; background: #FEE2E2; }
.ar-input-suffix { position: relative; }
.ar-input-suffix .ar-input { padding-right: 5.4rem; }
.ar-input-suffix > span { position: absolute; right: .8rem; top: 50%; transform: translateY(-50%); color: var(--ar-muted); font-size: .78rem; font-weight: 700; pointer-events: none; }

.ar-formula { font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace; color: var(--ar-navy); background: var(--ar-surface); border-left: 3px solid var(--ar-orange); padding: .9rem 1rem; font-size: .88rem; line-height: 1.7; }
.ar-table { width: 100%; border-collapse: collapse; font-size: .84rem; }
.ar-table th { color: var(--ar-muted); font-size: .68rem; text-transform: uppercase; letter-spacing: .05em; text-align: left; padding: .78rem .7rem; border-bottom: 1px solid var(--ar-border); white-space: nowrap; }
.ar-table td { color: var(--ar-text); padding: .85rem .7rem; border-bottom: 1px solid var(--ar-border); white-space: nowrap; }
.ar-metric { border-left: 2px solid var(--ar-border); padding-left: .8rem; }
.ar-metric span { display: block; color: var(--ar-muted); font-size: .68rem; text-transform: uppercase; letter-spacing: .04em; }
.ar-metric strong { display: block; color: var(--ar-navy); margin-top: .2rem; }

/* Resources / document control */
.ar-resource-status { display: inline-flex; align-items: center; min-height: 23px; padding: .18rem .45rem; border: 1px solid var(--ar-border); border-radius: 5px; font-size: .65rem; font-weight: 800; letter-spacing: .045em; text-transform: uppercase; }
.ar-resource-status--released { color: #166534; background: #F0FDF4; border-color: #BBF7D0; }
.ar-resource-status--prep { color: #475569; background: #F8FAFC; border-color: #CBD5E1; }
.ar-resource-status--testing { color: #8A4A08; background: #FFF7ED; border-color: #FED7AA; }
.ar-search-shell { border-top: 1px solid var(--ar-border); padding-top: 1rem; }
.ar-governance-note { border-left: 2px solid var(--ar-navy); padding-left: 1.1rem; }
.ar-doc-control { border-top: 2px solid var(--ar-navy); border-bottom: 1px solid var(--ar-border); padding-block: 1rem; }
.ar-doc-control dl > div { display: flex; justify-content: space-between; gap: 1rem; border-top: 1px solid var(--ar-border); padding-top: .65rem; }
.ar-doc-control dt { color: var(--ar-muted); }
.ar-doc-control dd { color: var(--ar-navy); font-weight: 700; text-align: right; }
.ar-safety-note { border-left: 2px solid #C58B2A; padding-left: 1rem; color: #6A4A13; }
.ar-breadcrumb { color: var(--ar-muted); font-size: .8rem; }
.ar-breadcrumb a:hover { color: var(--ar-orange); }

/* Long-form engineering content */
.ar-article-body { min-width: 0; }
.ar-article-section + .ar-article-section { margin-top: 2.6rem; padding-top: 2.6rem; border-top: 1px solid var(--ar-border); }
.ar-article-section h2 { color: var(--ar-navy); font-size: 1.5rem; line-height: 1.25; font-weight: 800; letter-spacing: -.02em; }
.ar-section-type { color: var(--ar-muted); font-size: .64rem; font-weight: 800; letter-spacing: .07em; text-transform: uppercase; }
.ar-richtext { color: var(--ar-text); font-size: .98rem; line-height: 1.82; }
.ar-richtext p + p, .ar-richtext ul + p, .ar-richtext ol + p, .ar-richtext p + ul, .ar-richtext p + ol { margin-top: 1rem; }
.ar-richtext ul { list-style: disc; padding-left: 1.4rem; }
.ar-richtext ol { list-style: decimal; padding-left: 1.4rem; }
.ar-richtext li + li { margin-top: .45rem; }
.ar-richtext h3 { color: var(--ar-navy); font-size: 1.15rem; font-weight: 800; margin-top: 1.8rem; }
.ar-richtext h4 { color: var(--ar-navy); font-size: 1rem; font-weight: 800; margin-top: 1.4rem; }
.ar-richtext table { width: 100%; border-collapse: collapse; margin-top: 1.25rem; font-size: .88rem; }
.ar-richtext th, .ar-richtext td { border-bottom: 1px solid var(--ar-border); padding: .7rem .6rem; text-align: left; vertical-align: top; }
.ar-richtext th { color: var(--ar-navy); font-size: .7rem; text-transform: uppercase; letter-spacing: .05em; }
.ar-richtext blockquote { margin: 1.25rem 0; border-left: 3px solid var(--ar-orange); background: var(--ar-surface); padding: .8rem 1rem; color: var(--ar-navy); }
.ar-richtext code { background: var(--ar-surface); border: 1px solid var(--ar-border); border-radius: 4px; padding: .1rem .3rem; font-size: .86em; }

/* Footer */
.ar-footer-grid { display: grid; gap: 2.2rem; }
.ar-footer-title { color: var(--ar-navy); font-size: .82rem; font-weight: 800; letter-spacing: .02em; }
.ar-footer-list { margin-top: .8rem; display: grid; gap: .5rem; color: var(--ar-muted); font-size: .84rem; }
.ar-footer-list a:hover { color: var(--ar-navy); }
.ar-knowledge-row { display: grid; gap: 1rem; }

@media (min-width: 768px) {
  .ar-knowledge-row { grid-template-columns: minmax(0, 1fr) minmax(0, 2fr); }
}
@media (min-width: 1120px) {
  .ar-nav-primary { display: flex; }
  .ar-mobile-nav { display: none; }
  .ar-footer-grid { grid-template-columns: 1.7fr 1fr 1fr 1.25fr; }
}
@media (max-width: 1119px) {
  .ar-brand-subtitle { display: none; }
}
@media (max-width: 767px) {
  .ar-section { padding-block: 46px; }
  .ar-page-hero { padding-block: 42px; }
  .ar-spec-grid { grid-template-columns: 1fr; }
  .ar-result-value { font-size: 1.65rem; }
  .ar-result-grid { grid-template-columns: 1fr; }
  .ar-nav-cta { display: none; }
}
.ar-navy-text { color: var(--ar-navy) !important; }
.ar-orange-border { border-color: var(--ar-orange) !important; }
.ar-home-hero { padding-block: 68px; border-bottom: 1px solid var(--ar-border); background: #fff; }
.ar-home-proofline { margin-top: 1.5rem; display: flex; flex-wrap: wrap; gap: .4rem 1.2rem; color: var(--ar-muted); font-size: .8rem; }
.ar-home-proofline span { position: relative; }
.ar-home-proofline span + span::before { content: ""; position: absolute; left: -.65rem; top: 50%; width: 3px; height: 3px; border-radius: 50%; background: #94A3B8; }
@media (max-width: 767px) { .ar-home-hero { padding-block: 50px; } }
.ar-navy-border { border-color: var(--ar-navy) !important; }

/* Async calculator/network feedback */
.ar-network-progress { position: fixed; inset: 0 0 auto 0; z-index: 10000; height: 3px; pointer-events: none; opacity: 0; background: transparent; transition: opacity .15s ease; }
.ar-network-progress span { display: block; height: 100%; width: 28%; background: var(--ar-orange); transform: translateX(-120%); }
.ar-network-progress.is-active { opacity: 1; }
.ar-network-progress.is-active span { animation: ar-network-progress 1.1s ease-in-out infinite; }
@keyframes ar-network-progress { 0% { transform: translateX(-120%); } 55% { transform: translateX(210%); } 100% { transform: translateX(430%); } }
.ar-spinner { width: 1rem; height: 1rem; border: 2px solid currentColor; border-right-color: transparent; border-radius: 999px; display: inline-block; margin-right: .5rem; vertical-align: -2px; animation: ar-spin .7s linear infinite; }
@keyframes ar-spin { to { transform: rotate(360deg); } }
.ar-content-loading { opacity: .62; transition: opacity .12s ease; pointer-events: none; }
@media (prefers-reduced-motion: reduce) { .ar-network-progress.is-active span, .ar-spinner { animation: none; } }
.ar-loading-status { position: fixed; right: 1rem; top: 4.75rem; z-index: 9999; padding: .45rem .65rem; border-left: 2px solid var(--ar-orange); background: #fff; color: var(--ar-navy); font-size: .75rem; font-weight: 700; letter-spacing: .02em; box-shadow: 0 8px 28px rgba(14,40,62,.08); opacity: 0; transform: translateY(-6px); pointer-events: none; transition: opacity .15s ease, transform .15s ease; }
.ar-loading-status.is-visible { opacity: 1; transform: translateY(0); }


/* Public presentation refinement */
.ar-course-list { border-top: 1px solid var(--ar-border); }
.ar-course-row {
  display: grid;
  grid-template-columns: minmax(0,1fr) auto;
  gap: 1.25rem;
  padding: 1.2rem 0;
  border-bottom: 1px solid var(--ar-border);
}
.ar-course-row:hover h3 { color: var(--ar-orange); }
.ar-course-eyebrow { color: var(--ar-muted); font-size: .72rem; font-weight: 700; }
.ar-course-price { color: var(--ar-navy); font-size: .9rem; font-weight: 800; white-space: nowrap; }
.ar-public-note { border-left: 2px solid var(--ar-border-strong); padding-left: 1rem; }
@media (max-width: 639px) { .ar-course-row { grid-template-columns: 1fr; gap: .5rem; } }

/* Phase 2O-R — controlled visual refinements only */
.ar-project-card { min-width: 0; }
.ar-project-card__media {
  display: block;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  border: 1px solid var(--ar-border);
  background: var(--ar-surface);
}
.ar-project-card__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .22s ease;
}
.ar-project-card:hover .ar-project-card__media img { transform: scale(1.012); }
.ar-project-card__body { padding-top: .95rem; }
.ar-filter-section {
  padding-block: 30px;
  border-bottom: 1px solid var(--ar-border);
  background: var(--ar-surface);
}

/* Field Handbook privacy policy */
.ar-policy-status {
  border-top: 2px solid var(--ar-navy);
  padding-top: 1rem;
}
.ar-policy-overview {
  display: grid;
  gap: 2rem;
  align-items: start;
}
.ar-policy-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid var(--ar-border-strong);
}
.ar-policy-facts > div {
  padding: 1rem 1rem 1rem 0;
  border-bottom: 1px solid var(--ar-border);
}
.ar-policy-facts > div:nth-child(even) { padding-left: 1rem; border-left: 1px solid var(--ar-border); }
.ar-policy-facts dt {
  color: var(--ar-muted);
  font-size: .68rem;
  font-weight: 800;
  letter-spacing: .06em;
  text-transform: uppercase;
}
.ar-policy-facts dd {
  margin-top: .4rem;
  color: var(--ar-navy);
  font-size: .9rem;
  line-height: 1.55;
  font-weight: 650;
}
.ar-policy-facts a { text-decoration: underline; text-decoration-color: var(--ar-border-strong); }
.ar-policy-layout { display: grid; gap: 3rem; }
.ar-policy-nav { align-self: start; }
.ar-policy-nav nav {
  margin-top: .8rem;
  border-top: 1px solid var(--ar-border);
}
.ar-policy-nav nav a {
  display: block;
  padding: .58rem 0;
  border-bottom: 1px solid var(--ar-border);
  color: var(--ar-muted);
  font-size: .78rem;
  line-height: 1.35;
}
.ar-policy-nav nav a:hover { color: var(--ar-navy); }
.ar-policy-nav__action { margin-top: 1rem; font-size: .78rem; }
.ar-policy-article { min-width: 0; }
.ar-policy-section {
  position: relative;
  scroll-margin-top: 96px;
  padding: 0 0 2.2rem 3.3rem;
}
.ar-policy-section + .ar-policy-section {
  padding-top: 2.2rem;
  border-top: 1px solid var(--ar-border);
}
.ar-policy-number {
  position: absolute;
  left: 0;
  top: .15rem;
  color: #94A3B8;
  font-size: .7rem;
  font-weight: 800;
  letter-spacing: .06em;
}
.ar-policy-section + .ar-policy-section .ar-policy-number { top: 2.35rem; }
.ar-policy-section h2 {
  color: var(--ar-navy);
  font-size: 1.35rem;
  line-height: 1.3;
  font-weight: 800;
  letter-spacing: -.02em;
}
.ar-policy-section p {
  margin-top: .85rem;
  color: var(--ar-text);
  font-size: .94rem;
  line-height: 1.78;
}
.ar-policy-section a { color: var(--ar-navy); font-weight: 650; }
.ar-policy-section a:hover { color: var(--ar-orange); }
.ar-policy-note {
  margin-top: 1rem;
  border-left: 3px solid var(--ar-orange);
  padding: .75rem 0 .75rem 1rem;
  color: #5E4A32;
  font-size: .84rem;
  line-height: 1.65;
}
.ar-policy-contact {
  margin-top: 1.1rem;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid var(--ar-border);
}
.ar-policy-contact > div { padding: .85rem 1rem .85rem 0; border-bottom: 1px solid var(--ar-border); }
.ar-policy-contact > div:nth-child(even) { padding-left: 1rem; border-left: 1px solid var(--ar-border); }
.ar-policy-contact span {
  display: block;
  color: var(--ar-muted);
  font-size: .66rem;
  font-weight: 800;
  letter-spacing: .05em;
  text-transform: uppercase;
}
.ar-policy-contact strong { display: block; margin-top: .3rem; color: var(--ar-navy); font-size: .88rem; }

@media (min-width: 900px) {
  .ar-policy-overview { grid-template-columns: 260px minmax(0, 1fr); }
  .ar-policy-layout { grid-template-columns: 230px minmax(0, 1fr); }
  .ar-policy-nav { position: sticky; top: 94px; }
}
@media (max-width: 899px) {
  .ar-policy-nav nav { columns: 2; column-gap: 1.5rem; }
  .ar-policy-nav nav a { break-inside: avoid; }
}
@media (max-width: 639px) {
  .ar-policy-facts,
  .ar-policy-contact { grid-template-columns: 1fr; }
  .ar-policy-facts > div:nth-child(even),
  .ar-policy-contact > div:nth-child(even) { padding-left: 0; border-left: 0; }
  .ar-policy-nav nav { columns: 1; }
  .ar-policy-section { padding-left: 2.2rem; }
}

/* Phase 2Q — Engineering Toolbox browser and calculator workspace */
.ar-toolbox-hero {
  padding: 44px 0 30px;
  border-bottom: 1px solid var(--ar-border);
  background: #fff;
}
.ar-toolbox-hero__copy { max-width: 780px; }
.ar-toolbox-hero__copy h1 {
  margin-top: .6rem;
  color: var(--ar-navy);
  font-size: clamp(2rem, 4vw, 3rem);
  line-height: 1.05;
  font-weight: 750;
  letter-spacing: -.035em;
}
.ar-toolbox-hero__copy > p:last-child { margin-top: 1rem; max-width: 720px; color: var(--ar-muted); font-size: 1rem; line-height: 1.65; }
.ar-tool-finder { margin-top: 1.7rem; max-width: 980px; }
.ar-tool-search-label { display: block; margin-bottom: .45rem; color: var(--ar-navy); font-size: .78rem; font-weight: 750; }
.ar-tool-search-wrap { position: relative; }
.ar-tool-search-wrap svg { position: absolute; left: .9rem; top: 50%; width: 18px; height: 18px; transform: translateY(-50%); color: #94A3B8; pointer-events: none; }
.ar-tool-search-wrap input {
  width: 100%; min-height: 48px; padding: .7rem 5rem .7rem 2.65rem;
  border: 1px solid var(--ar-border-strong); border-radius: 8px; background: #fff;
  color: var(--ar-text); font-size: .95rem; outline: none;
}
.ar-tool-search-wrap input:focus { border-color: var(--ar-navy); box-shadow: 0 0 0 3px rgba(14,40,62,.08); }
.ar-tool-search-clear { position: absolute; right: .7rem; top: 50%; transform: translateY(-50%); color: var(--ar-navy); font-size: .75rem; font-weight: 750; padding: .35rem .45rem; border-radius: 5px; }
.ar-tool-search-clear:hover { background: var(--ar-surface); }
.ar-tool-filter-tabs { display: flex; gap: .4rem; margin-top: .75rem; overflow-x: auto; padding-bottom: .15rem; scrollbar-width: thin; }
.ar-tool-filter { flex: 0 0 auto; min-height: 34px; padding: .42rem .68rem; border: 1px solid var(--ar-border); border-radius: 7px; color: #526171; background: #fff; font-size: .73rem; font-weight: 700; }
.ar-tool-filter span { color: #94A3B8; margin-left: .25rem; }
.ar-tool-filter:hover { border-color: var(--ar-border-strong); color: var(--ar-navy); background: var(--ar-surface); }
.ar-tool-filter.is-active { border-color: var(--ar-navy); color: #fff; background: var(--ar-navy); }
.ar-tool-filter.is-active span { color: rgba(255,255,255,.7); }

.ar-toolbox-browser { padding: 34px 0 58px; }
.ar-toolbox-layout { display: grid; grid-template-columns: 205px minmax(0,1fr); gap: 42px; align-items: start; }
.ar-toolbox-sidebar__sticky { position: sticky; top: 96px; }
.ar-toolbox-sidebar nav { margin-top: .55rem; border-top: 1px solid var(--ar-border); }
.ar-toolbox-sidebar nav a { display: grid; grid-template-columns: minmax(0,1fr) auto; gap: .8rem; align-items: center; padding: .78rem 0; border-bottom: 1px solid var(--ar-border); color: #4B5C6C; font-size: .78rem; font-weight: 650; }
.ar-toolbox-sidebar nav a:hover { color: var(--ar-navy); }
.ar-toolbox-sidebar nav b { min-width: 24px; color: #94A3B8; font-size: .7rem; text-align: right; }
.ar-toolbox-safety { margin-top: 1.6rem; padding-top: 1rem; border-top: 2px solid var(--ar-navy); }
.ar-toolbox-safety strong { color: var(--ar-navy); font-size: .78rem; }
.ar-toolbox-safety p { margin-top: .45rem; color: var(--ar-muted); font-size: .72rem; line-height: 1.55; }
.ar-toolbox-safety a { display: inline-flex; margin-top: .65rem; color: var(--ar-navy); font-size: .72rem; font-weight: 750; }
.ar-toolbox-results__top { display: flex; align-items: end; justify-content: space-between; gap: 1rem; padding-bottom: 1rem; border-bottom: 1px solid var(--ar-border); }
.ar-toolbox-results__top h2 { margin-top: .2rem; color: var(--ar-navy); font-size: 1.15rem; font-weight: 750; letter-spacing: -.015em; }
.ar-tool-empty { max-width: 480px; color: var(--ar-muted); font-size: .82rem; line-height: 1.5; }
.ar-tool-category { scroll-margin-top: 104px; padding-top: 2rem; }
.ar-tool-category[hidden] { display: none !important; }
.ar-tool-category__heading { display: flex; align-items: end; justify-content: space-between; gap: 1rem; margin-bottom: .65rem; }
.ar-tool-category__heading h3 { color: var(--ar-navy); font-size: 1.28rem; font-weight: 760; letter-spacing: -.02em; }
.ar-tool-category__heading p { margin-top: .2rem; max-width: 650px; color: var(--ar-muted); font-size: .78rem; line-height: 1.5; }
.ar-tool-category__heading > span { color: #94A3B8; font-size: .7rem; font-weight: 700; white-space: nowrap; }
.ar-tool-grid { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); border-top: 1px solid var(--ar-border); border-left: 1px solid var(--ar-border); }
.ar-tool-card { position: relative; min-height: 126px; display: grid; grid-template-columns: minmax(0,1fr) auto; gap: .9rem; padding: 1rem 1.05rem; border-right: 1px solid var(--ar-border); border-bottom: 1px solid var(--ar-border); background: #fff; }
.ar-tool-card[hidden] { display: none !important; }
.ar-tool-card:hover { background: #FBFCFD; }
.ar-tool-card strong { color: var(--ar-navy); font-size: .9rem; font-weight: 760; line-height: 1.35; }
.ar-tool-card p { margin-top: .38rem; color: var(--ar-muted); font-size: .76rem; line-height: 1.5; display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }
.ar-tool-card > span { align-self: center; color: #94A3B8; font-size: 1rem; transition: transform .15s ease, color .15s ease; }
.ar-tool-card:hover > span { transform: translateX(2px); color: var(--ar-orange); }

/* Compact calculator context beneath the main site navigation. */
.ar-tool-context { border-bottom: 1px solid var(--ar-border); background: #FBFCFD; }
.ar-tool-context__inner { min-height: 42px; display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
.ar-tool-context__path, .ar-tool-context__meta { display: flex; align-items: center; gap: .55rem; color: var(--ar-muted); font-size: .72rem; }
.ar-tool-context a { color: var(--ar-navy); font-weight: 700; }
.ar-tool-context a:hover { color: var(--ar-orange); }
.ar-tool-context__meta span { color: #94A3B8; }

/* Calculator pages: compact task-first workspace, reference material secondary. */
.ar-tool-page .ar-breadcrumb { display: none; }
.ar-tool-page main > .ar-section:first-child { padding-top: 34px; padding-bottom: 46px; }
.ar-tool-page main > .ar-section:first-child > .ar-shell > .mt-5 { margin-top: 0 !important; }
.ar-tool-page main h1.ar-heading { max-width: 800px; font-size: clamp(1.9rem,3.5vw,2.55rem) !important; line-height: 1.08 !important; font-weight: 760 !important; letter-spacing: -.03em; }
.ar-tool-page main h1.ar-heading + .ar-copy { max-width: 760px; margin-top: .7rem !important; font-size: .96rem !important; line-height: 1.6; }
.ar-tool-page .ar-kicker { font-size: .66rem; }
.ar-tool-page .mt-10 { margin-top: 1.6rem !important; }
.ar-tool-page .mt-6 { margin-top: 1rem !important; }
.ar-calculator-workspace { grid-template-columns: minmax(0,1.15fr) minmax(300px,.85fr) !important; align-items: start; gap: 1.25rem !important; }
.ar-calculator-form { border-color: var(--ar-border-strong); box-shadow: 0 7px 24px rgba(14,40,62,.04); }
.ar-calculator-form .ar-panel-header { padding: .95rem 1.05rem; background: #FBFCFD; }
.ar-calculator-form .ar-panel-header h2 { font-size: 1rem !important; }
.ar-calculator-form .ar-panel-body { padding: 1.05rem; }
.ar-calculator-form .ar-field { margin-bottom: .78rem; }
.ar-calculator-form .ar-label { font-size: .78rem; margin-bottom: .32rem; }
.ar-calculator-form .ar-input, .ar-calculator-form .ar-select { min-height: 40px; padding-top: .55rem; padding-bottom: .55rem; font-size: .9rem; }
.ar-calculator-form .ar-help { font-size: .72rem; line-height: 1.45; }
.ar-calculator-form .ar-calc-submit { width: auto !important; min-width: 150px; min-height: 40px; margin-top: .15rem; }
.ar-reset-link { display: inline-flex; align-items: center; justify-content: center; min-height: 40px; margin-left: .5rem; padding: 0 .72rem; color: var(--ar-muted); font-size: .76rem; font-weight: 700; border-radius: 6px; }
.ar-reset-link:hover { color: var(--ar-navy); background: var(--ar-surface); }
.ar-calculator-output { min-width: 0; }
.ar-calculator-output > .ar-result:first-child, .ar-calculator-output > .ar-panel:first-child { position: sticky; top: 124px; }
.ar-tool-page .ar-result { border-radius: 8px; padding: 1.15rem; }
.ar-tool-page .ar-result-value { font-size: 1.75rem; }
.ar-result-actions { display: flex; gap: .45rem; margin-top: 1rem; padding-top: .85rem; border-top: 1px solid rgba(255,255,255,.18); }
.ar-result-action { min-height: 32px; padding: .35rem .55rem; border: 1px solid rgba(255,255,255,.25); border-radius: 5px; color: #fff; font-size: .7rem; font-weight: 700; }
.ar-result-action:hover { background: rgba(255,255,255,.08); }

.ar-reference-panel { border-radius: 7px; overflow: hidden; }
.ar-reference-panel > .ar-panel-header { padding: 0; }
.ar-reference-toggle { width: 100%; display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding: .78rem .95rem; color: var(--ar-navy); text-align: left; font-size: .82rem; font-weight: 750; }
.ar-reference-toggle:hover { background: var(--ar-surface); }
.ar-reference-toggle i { color: #94A3B8; font-style: normal; transition: transform .15s ease; }
.ar-reference-toggle[aria-expanded="true"] i { transform: rotate(45deg); }
.ar-reference-panel > .ar-panel-body { padding: .95rem; }
.ar-reference-panel > .ar-panel-body[hidden] { display: none; }
.ar-tool-page .ar-formula { font-size: .8rem; line-height: 1.6; }

/* Related tool navigation keeps users moving without returning to the long directory. */
.ar-related-tools { padding: 34px 0 42px; border-top: 1px solid var(--ar-border); background: var(--ar-surface); }
.ar-related-tools__header { display: flex; align-items: end; justify-content: space-between; gap: 1rem; margin-bottom: .8rem; }
.ar-related-tools__header h2 { margin-top: .25rem; color: var(--ar-navy); font-size: 1.25rem; font-weight: 760; }
.ar-related-tools__grid { display: grid; grid-template-columns: repeat(4,minmax(0,1fr)); border-top: 1px solid var(--ar-border); border-left: 1px solid var(--ar-border); background: #fff; }
.ar-related-tool { min-height: 118px; display: grid; grid-template-columns: minmax(0,1fr) auto; align-content: start; gap: .35rem .7rem; padding: .9rem; border-right: 1px solid var(--ar-border); border-bottom: 1px solid var(--ar-border); }
.ar-related-tool:hover { background: #FBFCFD; }
.ar-related-tool strong { color: var(--ar-navy); font-size: .82rem; line-height: 1.35; }
.ar-related-tool span { grid-column: 1 / -1; color: var(--ar-muted); font-size: .72rem; line-height: 1.45; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.ar-related-tool i { color: #94A3B8; font-style: normal; }

@media (max-width: 1023px) {
  .ar-toolbox-layout { grid-template-columns: 1fr; gap: 1.4rem; }
  .ar-toolbox-sidebar { display: none; }
  .ar-calculator-workspace { grid-template-columns: 1fr !important; }
  .ar-calculator-output > .ar-result:first-child, .ar-calculator-output > .ar-panel:first-child { position: static; }
  .ar-related-tools__grid { grid-template-columns: repeat(2,minmax(0,1fr)); }
}
@media (max-width: 767px) {
  .ar-toolbox-hero { padding: 32px 0 22px; }
  .ar-toolbox-hero__copy h1 { font-size: 2rem; }
  .ar-toolbox-browser { padding-top: 24px; }
  .ar-tool-grid { grid-template-columns: 1fr; }
  .ar-tool-card { min-height: 0; padding: .9rem; }
  .ar-tool-category { padding-top: 1.5rem; }
  .ar-tool-category__heading { align-items: start; }
  .ar-tool-context__inner { min-height: 38px; }
  .ar-tool-context__meta span { display: none; }
  .ar-tool-context__path span, .ar-tool-context__path a:nth-of-type(2) { display: none; }
  .ar-tool-page main > .ar-section:first-child { padding-top: 26px; }
  .ar-calculator-form .ar-calc-submit { width: 100% !important; }
  .ar-reset-link { width: 100%; margin: .4rem 0 0; }
  .ar-related-tools__grid { grid-template-columns: 1fr; }
  .ar-related-tools__header { align-items: start; flex-direction: column; }
}