:root {
  --bg: #f7f8fa;
  --card: #ffffff;
  --ink: #1a1a1a;
  --muted: #5c6570;
  --line: #e3e6ea;
  --accent: #1f4e79;
  --accent-2: #2e75b6;
  --warm: #c55a11;
  --ok: #1e7a46;
  --radius: 12px;
  --shadow: 0 1px 3px rgba(16, 24, 40, 0.08), 0 1px 2px rgba(16, 24, 40, 0.04);
  font-size: 16px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.5;
}

a { color: var(--accent-2); }

.site-header {
  background: var(--accent);
  color: #fff;
  padding: 1.25rem 1.25rem 1rem;
}

.site-header h1 {
  margin: 0 0 0.25rem;
  font-size: 1.45rem;
  letter-spacing: -0.02em;
}

.site-header p {
  margin: 0;
  opacity: 0.9;
  font-size: 0.95rem;
  max-width: 52rem;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  padding: 0.75rem 1.25rem;
  background: #163a5c;
  position: sticky;
  top: 0;
  z-index: 10;
}

.nav button {
  appearance: none;
  border: 1px solid transparent;
  background: transparent;
  color: #d7e4f2;
  font: inherit;
  font-size: 0.9rem;
  padding: 0.45rem 0.75rem;
  border-radius: 999px;
  cursor: pointer;
}

.nav button:hover { background: rgba(255, 255, 255, 0.08); }

.nav button.active {
  background: #fff;
  color: var(--accent);
  font-weight: 600;
}

main {
  max-width: 960px;
  margin: 0 auto;
  padding: 1.25rem;
}

.panel {
  display: none;
}

.panel.active { display: block; }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.1rem 1.15rem;
  margin-bottom: 1rem;
}

.card h2 {
  margin: 0 0 0.5rem;
  font-size: 1.15rem;
}

.card h3 {
  margin: 1rem 0 0.4rem;
  font-size: 1rem;
}

.lead {
  color: var(--muted);
  margin-top: 0;
}

.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.85rem;
}

@media (max-width: 720px) {
  .grid-2 { grid-template-columns: 1fr; }
}

label.field {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--ink);
}

label.field span.hint {
  font-weight: 400;
  color: var(--muted);
  font-size: 0.8rem;
}

select, input[type="number"] {
  font: inherit;
  padding: 0.5rem 0.6rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  color: var(--ink);
}

.checkbox-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.92rem;
  font-weight: 500;
  margin-top: 0.35rem;
}

.results {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
  margin: 0.75rem 0 0.5rem;
}

@media (max-width: 640px) {
  .results { grid-template-columns: 1fr; }
}

.metric {
  background: #f3f6f9;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.75rem;
  text-align: center;
}

.metric .label {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.metric .value {
  font-size: 1.45rem;
  font-weight: 700;
  color: var(--accent);
  margin-top: 0.15rem;
}

.metric.expected {
  background: #e8f1fa;
  border-color: #b7d0ea;
}

.verdict {
  background: #fff8e8;
  border: 1px solid #f0d9a0;
  border-radius: 10px;
  padding: 0.75rem 0.9rem;
  font-size: 0.95rem;
  margin-top: 0.5rem;
}

canvas.chart {
  width: 100%;
  height: 160px;
  display: block;
  margin-top: 0.5rem;
}

canvas.chart.compare { height: 220px; }

table.data {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
  margin-top: 0.5rem;
}

.table-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

table.data th, table.data td {
  border-bottom: 1px solid var(--line);
  padding: 0.55rem 0.4rem;
  text-align: left;
  vertical-align: top;
}

table.data th {
  color: var(--muted);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  white-space: nowrap;
}

@media (max-width: 640px) {
  table.data { font-size: 0.85rem; }
  table.data th, table.data td { padding: 0.45rem 0.3rem; }
}

.odd-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 0.75rem;
}

.odd {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.75rem;
  background: #fafbfc;
}

.odd .big {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--warm);
}

.odd .desc {
  font-size: 0.85rem;
  color: var(--muted);
  margin-top: 0.25rem;
}

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

.playbook li {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.75rem 0.85rem;
  margin-bottom: 0.6rem;
  background: #fff;
}

.playbook strong {
  display: block;
  margin-bottom: 0.2rem;
  color: var(--accent);
}

.source-list {
  padding-left: 1.1rem;
}

.source-list li { margin-bottom: 0.45rem; }

.meta-note {
  font-size: 0.85rem;
  color: var(--muted);
}

.badge {
  display: inline-block;
  background: #e8f1fa;
  color: var(--accent);
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.15rem 0.55rem;
}

.site-footer {
  max-width: 960px;
  margin: 0 auto;
  padding: 0.9rem 1.25rem 2rem;
  color: var(--muted);
  font-size: 0.85rem;
  border-top: 1px solid var(--line);
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 0.6rem 1.5rem;
  flex-wrap: wrap;
}

.site-footer .footer-text {
  flex: 1 1 340px;
}

.site-footer p {
  margin: 0.15rem 0;
}

.site-footer .footer-note {
  font-size: 0.83rem;
  line-height: 1.5;
}

.site-footer .footer-privacy {
  opacity: 0.8;
}

.site-footer .footer-links {
  flex: 0 0 auto;
  display: flex;
  gap: 1.1rem;
  padding-top: 0.1rem;
}

.site-footer .footer-links a {
  color: var(--accent-2);
  text-decoration: none;
  white-space: nowrap;
}

.site-footer .footer-links a:hover { text-decoration: underline; }

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.75rem;
}

.actions a {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 600;
  padding: 0.5rem 0.85rem;
  border-radius: 8px;
}

.actions a.secondary {
  background: #fff;
  color: var(--accent);
  border: 1px solid var(--accent);
}

/* --- Doc pages (sources) --- */
.doc-main {
  max-width: 960px;
  margin: 0 auto;
  padding: 1.25rem;
}

.doc-main ul, .doc-main ol {
  margin: 0.4rem 0 0.8rem;
  padding-left: 1.25rem;
}

.doc-main li { margin-bottom: 0.35rem; }

.doc-main .callout {
  background: #fff8e8;
  border: 1px solid #f0d9a0;
  border-radius: 10px;
  padding: 0.7rem 0.9rem;
  font-size: 0.92rem;
  margin: 0.75rem 0;
}

.doc-main blockquote {
  margin: 0.5rem 0;
  padding: 0.55rem 0.85rem;
  border-left: 3px solid var(--accent-2);
  background: #f3f6f9;
  color: var(--ink);
  font-size: 0.95rem;
}

.doc-main pre {
  background: #f3f6f9;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0.75rem 0.9rem;
  overflow-x: auto;
  font-size: 0.82rem;
  line-height: 1.45;
  margin: 0.5rem 0 0.85rem;
}

.doc-main code {
  font-family: ui-monospace, Consolas, "Courier New", monospace;
  font-size: 0.88em;
  background: #f3f6f9;
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 0.05em 0.3em;
}

.doc-main pre code {
  background: none;
  border: none;
  padding: 0;
  font-size: inherit;
}

.doc-main .stack-line {
  font-weight: 600;
  color: var(--accent);
  margin: 0.25rem 0 0.75rem;
}

.checklist {
  list-style: none;
  padding-left: 0;
}

.checklist li {
  padding-left: 1.5rem;
  position: relative;
}

.checklist li::before {
  content: "☐";
  position: absolute;
  left: 0;
  color: var(--accent-2);
}