/* ML Field Guide — static, offline, no external assets. */

:root {
  color-scheme: light;
  --paper: #f6f2e7;
  --panel: #fbf8ef;
  --panel-2: #efe9d9;
  --ink: #17160f;
  --muted: #6d6757;
  --faint: #948d7a;
  --line: #d9d2bf;
  --line-strong: #b9b09a;
  --accent: #a8481c;
  --accent-soft: #f0dccd;
  --teal: #1d6b64;
  --teal-soft: #d9e8e4;
  --gold: #8a6a12;
  --ok: #2f6b3a;
  --warn: #8a3d16;
  --shadow: 0 1px 0 rgba(23, 22, 15, 0.04), 0 12px 32px rgba(23, 22, 15, 0.05);
  --nav-w: 286px;
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, serif;
  --sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: ui-monospace, "SFMono-Regular", Menlo, Consolas, "Liberation Mono", monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --paper: #13130f;
    --panel: #1a1a14;
    --panel-2: #22221a;
    --ink: #ece6d6;
    --muted: #a79f8b;
    --faint: #7d7663;
    --line: #343122;
    --line-strong: #4d4834;
    --accent: #e28a52;
    --accent-soft: #38271b;
    --teal: #7cc4ba;
    --teal-soft: #1c2f2c;
    --gold: #d3ad4a;
    --ok: #8fbf8a;
    --warn: #e0a06a;
    --shadow: 0 1px 0 rgba(0, 0, 0, 0.3), 0 14px 36px rgba(0, 0, 0, 0.35);
  }
}

* {
  box-sizing: border-box;
}
html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
  }
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 18px;
  line-height: 1.62;
  text-rendering: optimizeLegibility;
}

::selection {
  background: var(--accent-soft);
  color: var(--ink);
}

a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
}
a:hover {
  text-decoration-thickness: 2px;
}
a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.skip {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 100;
  background: var(--ink);
  color: var(--paper);
  padding: 10px 14px;
}
.skip:focus {
  left: 12px;
  top: 12px;
}

/* ---------- shell ---------- */

.sidebar {
  position: fixed;
  inset: 0 auto 0 0;
  z-index: 40;
  width: var(--nav-w);
  padding: 26px 18px 40px;
  overflow-y: auto;
  background: var(--paper);
  border-right: 1px solid var(--line);
  font-family: var(--sans);
  font-size: 13px;
  line-height: 1.35;
}
.brand {
  display: block;
  text-decoration: none;
  color: var(--ink);
  margin: 0 0 22px;
  padding: 0 8px;
}
.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  margin-right: 10px;
  border: 1px solid var(--ink);
  border-radius: 4px;
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.04em;
  vertical-align: middle;
}
.brand-text {
  display: inline-block;
  vertical-align: middle;
}
.brand-title {
  display: block;
  font-family: var(--serif);
  font-size: 17px;
  font-weight: 600;
  letter-spacing: 0.01em;
}
.brand-sub {
  display: block;
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
  margin-top: 2px;
}

.nav-part {
  margin: 18px 0 6px;
  padding: 0 8px;
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--faint);
}
.nav-list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.nav-list a {
  display: grid;
  grid-template-columns: 22px 1fr;
  gap: 6px;
  padding: 5px 8px;
  margin: 1px 0;
  color: var(--ink);
  text-decoration: none;
  border-radius: 4px;
  border-left: 2px solid transparent;
}
.nav-list a:hover {
  background: var(--panel-2);
}
.nav-list a[aria-current="page"] {
  background: var(--accent-soft);
  border-left-color: var(--accent);
  font-weight: 600;
}
.nav-num {
  font-family: var(--mono);
  font-size: 10.5px;
  color: var(--faint);
  padding-top: 2px;
}
.nav-list a[aria-current="page"] .nav-num {
  color: var(--accent);
}
.nav-note {
  margin: 26px 8px 0;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  font-size: 11.5px;
  color: var(--muted);
}
.nav-note code {
  font-size: 11px;
}

.mobile-bar {
  display: none;
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 50;
  height: 54px;
  align-items: center;
  justify-content: space-between;
  padding: 0 14px;
  background: var(--paper);
  background: color-mix(in srgb, var(--paper) 92%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.mobile-bar .brand {
  margin: 0;
  padding: 0;
}
.mobile-bar .brand-title {
  font-size: 15px;
}
.menu-btn {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  background: var(--panel);
  color: var(--ink);
  border: 1px solid var(--line-strong);
  padding: 8px 10px;
  border-radius: 4px;
  cursor: pointer;
}
.scrim {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 35;
  background: rgba(0, 0, 0, 0.4);
}
body.nav-open .scrim {
  display: block;
}

main {
  margin-left: var(--nav-w);
  padding: 54px 48px 96px;
}
article {
  max-width: 760px;
  margin: 0 auto;
}

/* ---------- typography ---------- */

h1 {
  font-family: var(--serif);
  font-size: clamp(34px, 4.2vw, 46px);
  line-height: 1.08;
  letter-spacing: -0.015em;
  margin: 0 0 14px;
  font-weight: 600;
}
.lede {
  font-size: 20px;
  line-height: 1.55;
  color: var(--muted);
  margin: 0 0 26px;
}
h2 {
  font-family: var(--serif);
  font-size: 28px;
  line-height: 1.2;
  letter-spacing: -0.01em;
  margin: 52px 0 14px;
  font-weight: 600;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}
h3 {
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.3;
  margin: 30px 0 8px;
  font-weight: 650;
  letter-spacing: -0.005em;
}
h4 {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin: 24px 0 6px;
  color: var(--muted);
}
p {
  margin: 0 0 16px;
}
ul,
ol {
  margin: 0 0 18px;
  padding-left: 24px;
}
li {
  margin: 0 0 7px;
}
li > p {
  margin: 0;
}
strong {
  font-weight: 650;
}

dfn {
  font-style: normal;
}
em {
  font-style: italic;
}
code {
  font-family: var(--mono);
  font-size: 0.84em;
  background: var(--panel-2);
  padding: 1px 4px;
  border-radius: 3px;
  border: 1px solid var(--line);
}
pre {
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.55;
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 14px 16px;
  overflow-x: auto;
  margin: 0 0 18px;
}
pre code {
  background: none;
  border: 0;
  padding: 0;
  font-size: 13px;
}
hr {
  border: 0;
  border-top: 1px solid var(--line);
  margin: 34px 0;
}

.page-head {
  margin-bottom: 8px;
}
.page-meta {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.06em;
  color: var(--faint);
  margin: 0 0 22px;
  text-transform: uppercase;
}

.toc {
  margin: 0 0 30px;
  padding: 14px 18px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--panel);
}
.toc-title {
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--faint);
  margin: 0 0 8px;
}
.toc ol {
  margin: 0;
  padding-left: 20px;
  font-family: var(--sans);
  font-size: 13px;
}
.toc li {
  margin: 3px 0;
}
.toc a {
  color: var(--ink);
  text-decoration: none;
}
.toc a:hover {
  color: var(--accent);
  text-decoration: underline;
}

.term {
  text-decoration: underline dotted var(--faint);
  text-underline-offset: 3px;
  color: inherit;
}
.term:hover {
  color: var(--accent);
}

.note,
.warn,
.measured {
  margin: 22px 0;
  padding: 14px 16px;
  border-left: 3px solid var(--line-strong);
  background: var(--panel);
  border-radius: 0 4px 4px 0;
  font-size: 16px;
  line-height: 1.55;
}
.note {
  border-left-color: var(--teal);
}
.warn {
  border-left-color: var(--accent);
}
.measured {
  border-left-color: var(--gold);
}
.note .label,
.warn .label,
.measured .label {
  display: block;
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 5px;
}
.note p:last-child,
.warn p:last-child,
.measured p:last-child {
  margin-bottom: 0;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 18px 0 22px;
  font-family: var(--sans);
  font-size: 13.5px;
  line-height: 1.45;
}
th,
td {
  text-align: left;
  vertical-align: top;
  padding: 8px 10px;
  border-bottom: 1px solid var(--line);
}
th {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  border-bottom: 1px solid var(--line-strong);
}
tbody tr:hover {
  background: var(--panel);
}
td code {
  font-size: 0.9em;
}

details.check {
  margin: 20px 0;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--panel);
}
details.check summary {
  cursor: pointer;
  padding: 12px 16px;
  font-family: var(--sans);
  font-size: 14px;
  font-weight: 600;
}
details.check[open] summary {
  border-bottom: 1px solid var(--line);
}
details.check .check-body {
  padding: 14px 16px;
  font-size: 16px;
}
details.check ol {
  margin-bottom: 0;
}

@font-face {
  font-family: "Guide Math";
  src: url("fonts/DejaVuSerif.ttf") format("truetype");
  font-display: swap;
}

.formula,
.flow-line {
  font-family: "Guide Math", "Cambria Math", "STIX Two Math", serif;
  font-size: 17px;
  background: var(--panel-2);
  border: 1px solid var(--line);
  padding: 10px 14px;
  border-radius: 4px;
  margin: 14px 0 18px;
  overflow-x: auto;
}
.formula math {
  font-family: "Guide Math", "Cambria Math", "STIX Two Math", serif;
  margin: 0;
  text-align: left;
}
.formula-note {
  color: var(--muted);
  font-family: var(--sans);
  font-size: 13px;
  margin: 10px 0 0;
}
.flow-line {
  font-family: var(--sans);
  font-size: 14px;
}

/* ---------- learning design ---------- */

.goals {
  margin: 22px 0 30px;
  padding: 14px 18px;
  border: 1px solid var(--line);
  background: var(--panel);
  border-radius: 6px;
}
.goals-title {
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 6px;
}
.goals ul {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.5;
}
.goals li {
  margin: 0 0 4px;
}

.keyidea {
  margin: 24px 0;
  padding: 14px 18px;
  border-left: 4px solid var(--accent);
  background: var(--accent-soft);
  border-radius: 0 6px 6px 0;
  font-size: 16.5px;
}
.keyidea .label {
  display: block;
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 4px;
}
.keyidea p:last-child {
  margin-bottom: 0;
}

.predict {
  font-family: var(--sans);
  font-size: 12.5px;
  line-height: 1.5;
  background: var(--teal-soft);
  border-left: 3px solid var(--teal);
  padding: 8px 11px;
  margin: 0 0 14px;
  border-radius: 0 4px 4px 0;
}
.predict strong {
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--teal);
  display: block;
  margin-bottom: 2px;
}

.review {
  margin: 26px 0;
  padding: 12px 16px;
  border: 1px dashed var(--line-strong);
  border-radius: 6px;
  font-family: var(--sans);
  font-size: 13.5px;
  line-height: 1.55;
  color: var(--muted);
}
.review strong {
  color: var(--ink);
}
.review p {
  margin: 0 0 6px;
}
.review p:last-child {
  margin-bottom: 0;
}

/* ---------- stack diagram ---------- */

.stack {
  list-style: none;
  margin: 26px 0 30px;
  padding: 0;
  font-family: var(--sans);
}
.stack li {
  display: grid;
  grid-template-columns: 34px 1fr auto;
  align-items: center;
  gap: 12px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  background: var(--panel);
  margin: 0 0 6px;
  border-radius: 4px;
  font-size: 14px;
}
.stack .stack-n {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--accent);
}
.stack .stack-t {
  font-weight: 600;
}
.stack .stack-d {
  font-family: var(--mono);
  font-size: 10px;
  color: var(--muted);
  text-align: right;
}

/* ---------- map cards ---------- */

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 12px;
  margin: 24px 0 30px;
}
.card {
  display: block;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--panel);
  text-decoration: none;
  color: var(--ink);
}
.card:hover {
  border-color: var(--accent);
  background: var(--accent-soft);
}
.card .card-k {
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
}
.card .card-t {
  display: block;
  font-family: var(--serif);
  font-size: 19px;
  margin: 4px 0 4px;
  font-weight: 600;
}
.card .card-d {
  display: block;
  font-family: var(--sans);
  font-size: 12.5px;
  line-height: 1.45;
  color: var(--muted);
}
.card .card-w {
  display: block;
  font-family: var(--mono);
  font-size: 10px;
  color: var(--teal);
  margin-top: 8px;
}

/* ---------- widgets ---------- */

.widget {
  margin: 34px -8px;
  padding: 20px;
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  background: var(--panel);
  box-shadow: var(--shadow);
  font-family: var(--sans);
}
.widget-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 4px;
}
.widget-title {
  font-family: var(--serif);
  font-size: 21px;
  font-weight: 600;
  margin: 0;
}
.widget-tag {
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--teal);
  border: 1px solid var(--teal);
  padding: 3px 6px;
  border-radius: 3px;
  white-space: nowrap;
}
.widget-sub {
  font-size: 13px;
  line-height: 1.45;
  color: var(--muted);
  margin: 0 0 16px;
}
.widget-note {
  font-size: 11.5px;
  line-height: 1.5;
  color: var(--muted);
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--line);
}
.widget-note strong {
  color: var(--ink);
}

.controls {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  gap: 14px 18px;
  margin: 0 0 16px;
}
.control {
  min-width: 0;
}
.control-top {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 8px;
  margin-bottom: 4px;
}
.control label {
  font-family: var(--sans);
  font-size: 12.5px;
  font-weight: 600;
}
.control output {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--accent);
  background: var(--panel-2);
  padding: 1px 5px;
  border-radius: 3px;
  border: 1px solid var(--line);
}
.control .hint {
  font-family: var(--sans);
  font-size: 11px;
  color: var(--muted);
  margin-top: 3px;
}
input[type="range"] {
  width: 100%;
  margin: 4px 0 0;
  accent-color: var(--accent);
  height: 20px;
  cursor: pointer;
}
input[type="checkbox"] {
  accent-color: var(--accent);
  width: 15px;
  height: 15px;
}
input[type="text"],
input[type="number"],
select,
textarea {
  font-family: var(--sans);
  font-size: 13px;
  color: var(--ink);
  background: var(--paper);
  border: 1px solid var(--line-strong);
  border-radius: 4px;
  padding: 7px 9px;
  width: 100%;
}
textarea {
  font-family: var(--mono);
  font-size: 12.5px;
  line-height: 1.5;
  resize: vertical;
  min-height: 88px;
}
.check-row {
  display: flex;
  align-items: center;
  gap: 7px;
  font-size: 12.5px;
  margin: 5px 0;
}
.check-row label {
  font-weight: 400;
}
.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 12px 0 0;
}
.btn {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  background: var(--ink);
  color: var(--paper);
  border: 1px solid var(--ink);
  padding: 8px 12px;
  border-radius: 4px;
  cursor: pointer;
}
.btn:hover {
  background: var(--accent);
  border-color: var(--accent);
}
.btn.secondary {
  background: transparent;
  color: var(--ink);
  border-color: var(--line-strong);
}
.btn.secondary:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: transparent;
}
.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.canvas-wrap {
  position: relative;
  width: 100%;
  margin: 8px 0 4px;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: var(--paper);
  overflow: hidden;
}
canvas.chart {
  display: block;
  width: 100%;
}
.canvas-cap {
  font-family: var(--mono);
  font-size: 10px;
  color: var(--faint);
  margin: 5px 0 0;
  letter-spacing: 0.03em;
}

.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 8px;
  margin: 12px 0;
}
.stat {
  padding: 9px 11px;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: var(--paper);
}
.stat .stat-k {
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
}
.stat .stat-v {
  display: block;
  font-family: var(--mono);
  font-size: 19px;
  font-weight: 600;
  color: var(--ink);
  margin-top: 2px;
}
.stat .stat-v small {
  font-size: 10px;
  color: var(--muted);
  font-weight: 400;
}
.stat .stat-n {
  display: block;
  font-size: 10.5px;
  color: var(--muted);
  margin-top: 1px;
}

.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 8px 0 0;
  font-family: var(--mono);
  font-size: 10px;
  color: var(--muted);
}
.legend i {
  display: inline-block;
  width: 9px;
  height: 9px;
  margin-right: 4px;
  border-radius: 1px;
  vertical-align: -1px;
}

.token-stream {
  font-family: var(--mono);
  font-size: 12px;
  line-height: 1.9;
  padding: 12px;
  border: 1px solid var(--line);
  background: var(--paper);
  border-radius: 4px;
  max-height: 150px;
  overflow: auto;
  word-break: break-word;
}
.tok {
  display: inline-block;
  padding: 0 2px;
  border-radius: 2px;
  margin: 1px 0;
}
.tok-0 {
  background: var(--accent-soft);
}
.tok-1 {
  background: var(--teal-soft);
}
.tok-2 {
  background: rgba(138, 106, 18, 0.16);
}

.mask-grid {
  display: grid;
  gap: 3px;
  margin: 10px 0;
  max-width: 340px;
}
.mask-cell {
  aspect-ratio: 1;
  border-radius: 2px;
  border: 1px solid var(--line);
  background: var(--paper);
  font-family: var(--mono);
  font-size: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--faint);
}
.mask-cell.allowed {
  background: var(--teal-soft);
  border-color: var(--teal);
  color: var(--teal);
}
.mask-cell.blocked {
  background: var(--panel-2);
  color: var(--faint);
  opacity: 0.5;
}
.mask-cell.q {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

.expert-grid {
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  gap: 4px;
  margin: 10px 0;
}
.expert {
  border: 1px solid var(--line);
  border-radius: 3px;
  padding: 4px 3px;
  text-align: center;
  font-family: var(--mono);
  font-size: 9px;
  background: var(--paper);
}
.expert .bar {
  height: 26px;
  margin-top: 3px;
  background: var(--teal-soft);
  border-radius: 2px;
  position: relative;
  overflow: hidden;
}
.expert .bar i {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--teal);
}
.expert.hot {
  border-color: var(--accent);
}
.expert.hot .bar i {
  background: var(--accent);
}

.slot-row {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
  margin: 10px 0;
}
.slot {
  min-width: 34px;
  width: auto;
  padding: 0 6px;
  height: 30px;
  border: 1px solid var(--line);
  border-radius: 3px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--mono);
  font-size: 10px;
  background: var(--paper);
  color: var(--faint);
}
.slot.ok {
  background: var(--teal-soft);
  border-color: var(--teal);
  color: var(--teal);
}
.slot.bad {
  background: var(--accent-soft);
  border-color: var(--accent);
  color: var(--accent);
}

.glossary-list {
  list-style: none;
  margin: 18px 0;
  padding: 0;
}
.glossary-list .g-item[hidden] {
  display: none;
}
.glossary-list .g-item {
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
}
.glossary-list .g-item:target {
  background: var(--accent-soft);
  border-left: 4px solid var(--accent);
  padding-left: 12px;
  padding-right: 12px;
  scroll-margin-top: 80px;
}
.glossary-list dt {
  font-family: var(--sans);
  font-size: 15px;
  font-weight: 650;
  margin: 0 0 3px;
}
.glossary-list dd {
  margin: 0;
  font-size: 15.5px;
  color: var(--ink);
}
.glossary-list .g-tag {
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  border: 1px solid var(--line);
  padding: 1px 5px;
  border-radius: 3px;
  margin-left: 6px;
  vertical-align: 2px;
}
.glossary-list .g-link {
  font-family: var(--mono);
  font-size: 10.5px;
}
.no-results {
  padding: 16px;
  color: var(--muted);
  font-family: var(--sans);
  font-size: 13px;
}

/* ---------- footer ---------- */

.page-foot {
  margin-top: 56px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  font-family: var(--sans);
  font-size: 13px;
  color: var(--muted);
}
.page-foot .foot-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin: 0 0 18px;
}
.page-foot a {
  display: block;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 4px;
  text-decoration: none;
  color: var(--ink);
  background: var(--panel);
}
.page-foot a:hover {
  border-color: var(--accent);
}
.page-foot .dir {
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--faint);
  display: block;
  margin-bottom: 2px;
}
.page-foot .foot-title {
  font-family: var(--serif);
  font-size: 16px;
}
.foot-note {
  font-size: 11.5px;
  line-height: 1.5;
}
.foot-note code {
  font-size: 10.5px;
}

@media (max-width: 980px) {
  .sidebar {
    padding-top: 70px;
    visibility: hidden;
    transform: translateX(-100%);
    transition:
      transform 0.2s ease,
      visibility 0s linear 0.2s;
    box-shadow: 0 0 40px rgba(0, 0, 0, 0.2);
  }
  body.nav-open .sidebar {
    visibility: visible;
    transform: none;
    transition: transform 0.2s ease;
  }
  .sidebar .brand {
    display: none;
  }
  .mobile-bar {
    display: flex;
  }
  main {
    margin-left: 0;
    padding: 76px 22px 80px;
  }
  .widget {
    margin-left: 0;
    margin-right: 0;
  }
  h1 {
    font-size: 34px;
  }
  h2 {
    font-size: 24px;
  }
}

@media (max-width: 560px) {
  body {
    font-size: 17px;
  }
  main {
    padding-left: 16px;
    padding-right: 16px;
  }
  .widget {
    padding: 14px;
  }
  .controls {
    grid-template-columns: 1fr 1fr;
    gap: 10px;
  }
  .page-foot .foot-grid {
    grid-template-columns: 1fr;
  }
  .expert-grid {
    grid-template-columns: repeat(4, 1fr);
  }
  .stat-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media print {
  .sidebar,
  .mobile-bar,
  .scrim,
  .toc {
    display: none !important;
  }
  main {
    margin: 0;
    padding: 0;
  }
  .widget {
    break-inside: avoid;
    box-shadow: none;
  }
  a {
    color: var(--ink);
  }
}

/* ---------- search ---------- */

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.nav-search {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 6px;
  margin: 0 0 18px;
  padding: 0 8px;
}
.nav-search input {
  font-family: var(--sans);
  font-size: 12px;
  padding: 7px 8px;
  min-width: 0;
}
.nav-search button {
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  background: var(--ink);
  color: var(--paper);
  border: 1px solid var(--ink);
  border-radius: 4px;
  padding: 0 9px;
  cursor: pointer;
}
.nav-search button:hover {
  background: var(--accent);
  border-color: var(--accent);
}

.mobile-actions {
  display: flex;
  align-items: center;
  gap: 6px;
}

.search-form {
  display: flex;
  gap: 8px;
  align-items: stretch;
  margin: 22px 0 10px;
}
.search-form input {
  flex: 1 1 auto;
  min-width: 0;
  font-size: 15px;
  padding: 10px 12px;
  height: 44px;
}
.search-form .btn {
  flex: 0 0 auto;
  padding: 0 18px;
  height: 44px;
}
.search-hint {
  font-family: var(--sans);
  font-size: 12px;
  color: var(--muted);
  margin: 0 0 22px;
}

.filters {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr) auto;
  gap: 10px 14px;
  align-items: end;
  margin: 16px 0 10px;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--panel);
}
.filters label {
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
}
.filters select {
  margin-top: 4px;
  font-size: 12.5px;
  padding: 6px 8px;
}
.filters .btn {
  align-self: end;
  height: 34px;
}

.search-status {
  font-family: var(--mono);
  font-size: 10.5px;
  line-height: 1.5;
  color: var(--muted);
  min-height: 1.4em;
  margin: 8px 0 4px;
}

.search-results {
  list-style: none;
  margin: 0;
  padding: 0;
}
.result {
  border-bottom: 1px solid var(--line);
}
.result-link {
  display: block;
  padding: 14px 12px;
  margin: 0 -12px;
  color: var(--ink);
  text-decoration: none;
  border-radius: 4px;
}
.result-link:hover,
.result-link:focus-visible {
  background: var(--panel-2);
}
.result-meta {
  display: block;
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 3px;
}
.result-title {
  display: block;
  font-family: var(--serif);
  font-size: 21px;
  line-height: 1.25;
  font-weight: 600;
  letter-spacing: -0.005em;
  margin-bottom: 3px;
}
.result-snippet {
  display: block;
  font-family: var(--sans);
  font-size: 13.5px;
  line-height: 1.5;
  color: var(--muted);
}
.result-snippet mark,
.result-title mark {
  background: var(--accent-soft);
  color: var(--ink);
  padding: 0 1px;
  border-radius: 2px;
}

.search-empty {
  margin: 18px 0;
  padding: 16px 18px;
  border: 1px dashed var(--line-strong);
  border-radius: 6px;
  background: var(--panel);
  font-family: var(--sans);
  font-size: 13.5px;
  line-height: 1.55;
  color: var(--muted);
}
.search-empty p {
  margin: 0 0 10px;
}
.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.chips .btn {
  font-size: 9px;
  padding: 6px 9px;
}

.search-tips {
  margin: 34px 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  font-family: var(--sans);
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--muted);
}
.search-tips p {
  margin: 0 0 8px;
}
.search-tips kbd {
  font-family: var(--mono);
  font-size: 10px;
  border: 1px solid var(--line-strong);
  border-bottom-width: 2px;
  border-radius: 3px;
  padding: 1px 5px;
  background: var(--paper);
  color: var(--ink);
}
.search-tips code {
  font-size: 0.95em;
}

@media (max-width: 980px) {
  .sidebar .nav-search {
    margin-top: 4px;
  }
}

@media (max-width: 560px) {
  .search-form {
    flex-wrap: wrap;
  }
  .search-form input {
    flex-basis: 100%;
  }
  .search-form .btn {
    width: 100%;
  }
  .filters {
    grid-template-columns: 1fr;
  }
  .filters .btn {
    width: 100%;
  }
  .result-title {
    font-size: 19px;
  }
  .mobile-actions .menu-btn {
    padding: 8px 8px;
  }
}

/* In-page glossary definitions */
.definition-dialog {
  width: min(32rem, calc(100% - 2rem));
  max-height: calc(100% - 2rem);
  overflow: auto;
  padding: 24px;
  border: 1px solid var(--line-strong);
  border-radius: 6px;
  background: var(--panel);
  color: var(--ink);
  box-shadow: var(--shadow);
}
.definition-dialog::backdrop {
  background: rgba(0, 0, 0, 0.5);
}
.definition-dialog h2 {
  margin: 0 0 12px;
}
.definition-dialog p {
  margin: 0 0 20px;
}
.definition-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

/* Explanatory diagrams */
.explain-figure {
  margin: 22px 0 28px;
}
.diagram-scroll {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--panel);
  padding: 14px;
}
.diagram-scroll:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}
.diagram-scroll svg {
  display: block;
  width: 100%;
  min-width: 620px;
  height: auto;
}
.diagram-box {
  fill: var(--paper);
  stroke: var(--line-strong);
  stroke-width: 1.5;
}
.diagram-box.accent {
  fill: var(--accent-soft);
  stroke: var(--accent);
}
.diagram-box.teal {
  fill: var(--teal-soft);
  stroke: var(--teal);
}
.diagram-title {
  font: 600 17px var(--sans);
  fill: var(--ink);
}
.diagram-detail {
  font: 13px var(--sans);
  fill: var(--ink);
}
.diagram-arrow {
  fill: none;
  stroke: var(--muted);
  stroke-width: 2;
}
.diagram-arrowhead {
  fill: var(--muted);
}
.explain-figure figcaption {
  color: var(--muted);
  font: 14px / 1.5 var(--sans);
  margin-top: 8px;
}
.diagram-bracket {
  fill: none;
  stroke: var(--muted);
  stroke-width: 1.5;
}
.diagram-hint {
  display: none;
}
@media (max-width: 700px) {
  .diagram-hint {
    display: block;
    margin: 6px 0 0;
    color: var(--muted);
    font: 12px / 1.4 var(--sans);
  }
}

.article-hero {
  margin: 0 0 24px;
  overflow: hidden;
  border-radius: 6px;
  background: var(--paper);
}
.article-hero figcaption {
  color: var(--muted);
  font: 14px / 1.5 var(--sans);
  margin-top: 8px;
}
.article-hero img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--line);
  border-radius: 6px;
}
.diagram-details {
  margin-top: 10px;
}
.diagram-details summary {
  width: fit-content;
  color: var(--accent);
  cursor: pointer;
  font: 600 14px / 1.5 var(--sans);
}
.diagram-details[open] .diagram-scroll {
  margin-top: 10px;
}

/* Keep the reading surface calm and the interactive evidence legible. */
.widget {
  box-shadow: none;
  padding: 24px;
}
.widget-title {
  margin-bottom: 8px;
}
.widget-sub,
.widget-note {
  font-size: 13px;
  line-height: 1.6;
}
.control label {
  font-size: 14px;
}
.control-top {
  flex-wrap: wrap;
}
.control output {
  white-space: nowrap;
}
.control .hint {
  font-size: 12px;
}
.controls {
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
  margin-top: 18px;
}
.stat-grid {
  grid-template-columns: repeat(auto-fit, minmax(155px, 1fr));
}
.stat .stat-k {
  font-family: var(--sans);
  font-size: 12px;
  letter-spacing: 0;
  text-transform: none;
}
.stat .stat-v {
  font-size: 20px;
  overflow-wrap: anywhere;
}
.stat .stat-n,
.stat .stat-v small {
  font-size: 12px;
}
.btn {
  font-family: var(--sans);
  font-size: 13px;
  letter-spacing: 0;
  text-transform: none;
  min-height: 40px;
}
.canvas-cap {
  font-family: var(--sans);
  font-size: 12px;
  line-height: 1.5;
  letter-spacing: 0;
  color: var(--muted);
}
.widget-result {
  font: 15px / 1.6 var(--sans);
  margin: 18px 0 8px;
}
.widget-result[data-state="warning"] {
  color: var(--warn);
}
.widget-section {
  border-top: 1px solid var(--line);
  margin-top: 28px;
  padding-top: 4px;
}
.widget h4 {
  font: 600 17px / 1.4 var(--sans);
  letter-spacing: 0;
  text-transform: none;
  color: var(--ink);
}
.budget-meter {
  width: 100%;
  height: 26px;
  margin-top: 8px;
}
.sampling-table {
  margin-top: 18px;
  font-size: 14px;
}
.sampling-table meter {
  width: 55%;
  height: 18px;
  vertical-align: middle;
  margin-right: 12px;
}
.sampling-table th {
  text-transform: none;
  letter-spacing: 0;
  font: 600 13px var(--sans);
}
.inactive-control {
  opacity: 0.55;
}
.toc summary {
  font: 600 14px var(--sans);
  cursor: pointer;
  color: var(--muted);
}
.toc ol {
  margin-top: 12px;
}
.no-js-note {
  max-width: 760px;
  margin: 20px auto;
  padding: 16px;
}
@media (max-width: 560px) {
  .widget {
    padding: 16px;
  }
  .controls {
    grid-template-columns: 1fr;
    gap: 16px;
  }
  .stat-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .sampling-table meter {
    display: block;
    width: 100%;
  }
}
.table-scroll {
  max-width: 100%;
  overflow-x: auto;
}
.table-scroll:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}
.widget {
  scroll-margin-top: 90px;
}
@media (max-width: 560px) {
  .table-scroll table {
    min-width: 540px;
  }
}

/* The introduction has one index; navigation links share button geometry. */
.guide-index {
  display: grid;
  grid-template-columns: 1fr;
}
.guide-index .card {
  display: block;
  padding: 16px 0;
  border: 0;
  border-bottom: 1px solid var(--line);
  border-radius: 0;
  background: transparent;
  box-shadow: none;
}
.guide-index .card:hover {
  background: transparent;
  transform: none;
}
.guide-index .card-t {
  font-size: 19px;
}
.guide-index .card-d {
  font-size: 14px;
  line-height: 1.5;
}
.mobile-actions .menu-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 36px;
  width: 82px;
  padding: 0 10px;
  line-height: 1;
  text-decoration: none;
  font-weight: 400;
}
@media (max-width: 360px) {
  .mobile-bar {
    padding-inline: 10px;
  }
  .mobile-bar .brand-mark {
    margin-right: 6px;
  }
  .mobile-actions .menu-btn {
    width: 72px;
    padding-inline: 7px;
    font-size: 10px;
  }
}