:root {
  --bg: #f8fafc;
  --surface: #ffffff;
  --surface-alt: #f1f5f9;
  --border: #e2e8f0;
  --text: #0f172a;
  --muted: #475569;
  --primary: #0f766e;
  --primary-hover: #115e59;
  --primary-soft: #ccfbf1;
  --sky-soft: #e0f2fe;
  --sky-text: #0369a1;
  --emerald-soft: #d1fae5;
  --emerald-text: #047857;
  --amber-soft: #fef3c7;
  --amber-text: #b45309;
  --rose-soft: #ffe4e6;
  --rose-text: #be123c;
  --radius: 14px;
  --shadow: 0 4px 20px -2px rgba(15, 23, 42, 0.06);
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }
.container { max-width: 1120px; margin: 0 auto; padding: 0 20px; }
.site-header {
  background: rgba(255,255,255,0.94);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 40;
}
.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
  gap: 16px;
  flex-wrap: wrap;
  padding: 8px 0;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 1.18rem;
  color: var(--text);
  letter-spacing: -0.02em;
}
.brand:hover { text-decoration: none; }
.brand-mark {
  width: 34px;
  height: 34px;
  border-radius: 10px;
  background: linear-gradient(135deg, #0f766e, #0284c7);
  color: #fff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 0.95rem;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}
.nav-links a, .nav-btn {
  padding: 7px 12px;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--muted);
  background: transparent;
  border: none;
  cursor: pointer;
  transition: all 0.15s ease;
}
.nav-links a:hover, .nav-links a.active, .nav-btn:hover, .nav-btn.active {
  background: var(--surface-alt);
  color: var(--primary);
  text-decoration: none;
}
.hero {
  padding: 40px 0 28px;
}
.hero-card {
  background: linear-gradient(135deg, #0f172a 0%, #134e4a 100%);
  color: #fff;
  border-radius: 20px;
  padding: 36px 32px;
  box-shadow: var(--shadow);
}
.hero-card h1 { margin: 0 0 10px; font-size: clamp(1.6rem, 3vw, 2.25rem); line-height: 1.25; letter-spacing: -0.02em; }
.hero-card p { margin: 0; color: #cbd5e1; max-width: 740px; font-size: 1rem; }
.search-bar {
  margin-top: 22px;
  display: flex;
  gap: 10px;
  max-width: 560px;
}
.search-bar input {
  width: 100%;
  padding: 13px 16px;
  border-radius: 12px;
  border: 1px solid rgba(255,255,255,0.2);
  background: rgba(255,255,255,0.96);
  color: var(--text);
  font-size: 0.96rem;
  outline: none;
}
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  font-size: 0.85rem;
  color: var(--muted);
  margin: 22px 0 14px;
}
.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(310px, 1fr));
  gap: 18px;
}
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  box-shadow: var(--shadow);
  transition: transform 0.15s ease, border-color 0.15s ease;
}
.card-link:hover {
  transform: translateY(-2px);
  border-color: #99f6e4;
  text-decoration: none;
}
.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.01em;
}
.badge-teal { background: var(--primary-soft); color: var(--primary); }
.badge-sky { background: var(--sky-soft); color: var(--sky-text); }
.badge-emerald { background: var(--emerald-soft); color: var(--emerald-text); }
.badge-amber { background: var(--amber-soft); color: var(--amber-text); }
.badge-rose { background: var(--rose-soft); color: var(--rose-text); }

.calc-layout {
  display: grid;
  grid-template-columns: 1.08fr 0.92fr;
  gap: 24px;
  align-items: start;
  margin-top: 18px;
}
@media (max-width: 860px) {
  .calc-layout { grid-template-columns: 1fr; }
  .hero-card { padding: 26px 20px; }
}
.preset-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 18px;
}
.preset-btn {
  background: var(--surface-alt);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 7px 12px;
  border-radius: 9px;
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s;
}
.preset-btn:hover {
  background: var(--primary-soft);
  border-color: #5eead4;
  color: var(--primary);
}
.form-group { margin-bottom: 15px; }
.form-group label {
  display: block;
  font-size: 0.88rem;
  font-weight: 600;
  margin-bottom: 6px;
  color: #1e293b;
}
.form-control {
  width: 100%;
  padding: 11px 13px;
  border: 1px solid #cbd5e1;
  border-radius: 10px;
  font-size: 0.96rem;
  font-family: inherit;
  background: #fff;
  color: var(--text);
}
.form-control:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(15, 118, 110, 0.14);
}
.result-panel {
  background: linear-gradient(180deg, #ffffff 0%, #f8fafc 100%);
  border: 2px solid #99f6e4;
  border-radius: var(--radius);
  padding: 24px;
}
.primary-metric {
  font-size: clamp(1.75rem, 3.2vw, 2.35rem);
  font-weight: 800;
  color: var(--text);
  letter-spacing: -0.03em;
  margin: 8px 0 4px;
  line-height: 1.15;
}
.metric-sub { font-size: 0.9rem; color: var(--muted); margin-bottom: 16px; }
.metric-list {
  border-top: 1px solid var(--border);
  padding-top: 14px;
  display: grid;
  gap: 10px;
}
.metric-row {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  font-size: 0.9rem;
}
.metric-row span:last-child { font-weight: 700; text-align: right; }
.status-banner {
  margin-top: 16px;
  padding: 12px 14px;
  border-radius: 10px;
  font-size: 0.87rem;
  font-weight: 600;
}
.status-safe { background: var(--emerald-soft); color: var(--emerald-text); }
.status-warn { background: var(--amber-soft); color: var(--amber-text); }
.status-danger { background: var(--rose-soft); color: var(--rose-text); }

.formula-box {
  background: #0f172a;
  color: #e2e8f0;
  padding: 15px 18px;
  border-radius: 10px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.88rem;
  overflow-x: auto;
  margin: 12px 0;
}
.cite-box {
  background: var(--surface-alt);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px;
  font-size: 0.85rem;
  margin-bottom: 10px;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 14px;
  border-radius: 9px;
  font-size: 0.86rem;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid var(--border);
  background: #fff;
  color: var(--text);
  transition: all 0.15s;
}
.btn:hover { border-color: var(--primary); color: var(--primary); text-decoration: none; }
.btn-primary { background: var(--primary); color: #fff; border-color: var(--primary); }
.btn-primary:hover { background: var(--primary-hover); color: #fff; }
.table-wrap { overflow-x: auto; }
table.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}
table.data-table th, table.data-table td {
  padding: 12px 14px;
  border-bottom: 1px solid var(--border);
  text-align: left;
  vertical-align: top;
}
table.data-table th { background: var(--surface-alt); font-weight: 700; }
.site-footer {
  margin-top: 56px;
  border-top: 1px solid var(--border);
  background: #fff;
  padding: 32px 0;
  font-size: 0.88rem;
  color: var(--muted);
}
.toast {
  position: fixed;
  bottom: 22px;
  right: 22px;
  background: #0f172a;
  color: #fff;
  padding: 11px 16px;
  border-radius: 10px;
  font-size: 0.87rem;
  font-weight: 600;
  opacity: 0;
  pointer-events: none;
  transform: translateY(8px);
  transition: all 0.2s ease;
  z-index: 99;
}
.toast.show { opacity: 1; transform: translateY(0); }

/* Refinements preserve the supplied reference design and color system. */
[hidden] { display:none !important; }
html { scroll-behavior:smooth; scroll-padding-top:100px; }
.container.nav-wrap { padding:8px 20px; }
.grid-3 { grid-template-columns:repeat(auto-fit,minmax(min(100%,310px),1fr)); }
.card,.result-panel,.page-content,.calc-layout>* { min-width:0; }
.card,.cite-box,.metric-row,.breadcrumb { overflow-wrap:anywhere; }
.nav-links a { white-space:nowrap; }
.menu-toggle { display:none; min-height:44px; }
.skip-link { position:fixed;top:-80px;left:16px;z-index:100;background:white;padding:12px 18px;border:2px solid #0f766e; }
.skip-link:focus { top:12px; }
a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible { outline:3px solid #0891b2;outline-offset:3px; }
.form-control[aria-invalid="true"] { border-color:#be123c;background:#fff6f7; }
.form-title,.result-title { margin:0 0 8px;font-size:1.1rem; }
.form-help,.result-note,.source-note { font-size:.84rem;color:#475569;line-height:1.65; }
.form-help { margin:0 0 20px; }
.result-note { border-top:1px solid #e2e8f0;padding-top:14px;margin-bottom:0; }
.form-control { min-width:0; }
.content-with-toc { display:grid;grid-template-columns:minmax(0,1fr) 180px;gap:24px;align-items:start; }
.toc { position:sticky;top:94px;padding:18px 0 18px 18px;border-left:2px solid #e2e8f0;font-size:.82rem; }
.toc strong { display:block;font-size:.8rem;text-transform:uppercase;letter-spacing:.06em;margin-bottom:10px; }
.toc a { display:block;padding:7px 0;color:#475569; }
.toc a:hover { color:#0f766e; }
#am-calc-root > section.card { margin-top:20px; }
#am-calc-root > section.card h2 { margin:0 0 12px;font-size:1.15rem; }
#am-calc-root > section.card p { font-size:.92rem; }
#am-calc-root .calc-layout { gap:18px;grid-template-columns:1.05fr 1fr; }
#am-calc-root .card { padding:20px; }
#am-calc-root .result-panel { padding:20px; }
.editorial-status { font-size:.8rem!important;border-left:3px solid #d97706;padding-left:12px;color:#854d0e; }
.action-row { display:flex;flex-wrap:wrap;gap:8px;margin-top:20px; }
.btn,.preset-btn { min-height:44px; }
button:disabled { opacity:.5;cursor:not-allowed; }
.search-count { margin-top:10px!important;font-size:.82rem!important; }
.empty-state { margin-top:16px;text-align:center; }
.empty-state h3 { margin:0; }
details { border-top:1px solid #e2e8f0;padding:12px 0; }
summary { cursor:pointer;font-weight:600;font-size:.92rem; }
details p { color:#475569; }
.footer-status { flex-basis:100%;font-size:.76rem;color:#64748b;margin-bottom:0; }
.prose-card { padding:30px;max-width:900px;margin-inline:auto; }
.prose-card h1 { font-size:clamp(1.6rem,3vw,2rem);line-height:1.25;margin-top:8px; }
.prose-card h2 { font-size:1.2rem;margin-top:28px; }
.prose-card li { margin-bottom:10px; }
.formula-box { white-space:normal;overflow-wrap:anywhere; }
.toast { max-width:calc(100vw - 40px); }
@media(min-width:1150px) { main.container:has(.content-with-toc) { max-width:1320px; } }
@media(max-width:1000px) {
 .content-with-toc { display:flex;flex-direction:column;gap:18px; }
 .page-content { width:100%; }
 .toc { position:static;order:-1;width:100%;padding:14px 18px;border:1px solid #e2e8f0;border-radius:12px;background:white; }
 .toc a { display:inline-block;margin-right:18px; }
 .toc strong { margin-bottom:4px; }
}
@media(max-width:860px) {
 .menu-toggle { display:inline-flex;align-items:center; }
 .nav-wrap { gap:8px; }
 .nav-links { display:none;width:100%;padding:8px 0; }
 .nav-links.is-open { display:flex;flex-direction:column;align-items:stretch; }
 .nav-links a { padding:12px; }
 #am-calc-root .calc-layout { grid-template-columns:1fr; }
 .site-header:has(.is-open) { position:relative; }
}
@media(max-width:480px) {
 .container { padding:0 16px; }
 .container.nav-wrap { padding:8px 16px; }
 .hero { padding-top:24px; }
 .hero-card { padding:24px 20px; }
 .hero-card .badge { border-radius:8px;font-size:.67rem; }
 .brand { font-size:1.08rem; }
 .card { padding:18px; }
 .prose-card { padding:22px; }
 .metric-row { display:grid;grid-template-columns:minmax(0,1.4fr) minmax(0,1fr);gap:10px;font-size:.84rem; }
 .search-bar input { font-size:16px; }
 .breadcrumb { font-size:.75rem; }
}
@media(prefers-reduced-motion:reduce) { html {scroll-behavior:auto;} * {transition:none!important;} }
@media print { .site-header,.toc,.site-footer,.action-row,.preset-row,.toast,.skip-link {display:none;} .content-with-toc {display:block;} body {background:white;} .card,.result-panel {box-shadow:none;break-inside:avoid;} details {display:block;} }