/* The two middles — an explorable read of Monsoon's market economy.
   Family law: the field-survey plate book (sixth and seventh members,
   briefs/how-it-plays and design/prototypes/economy-brief). Paper, ink,
   one annotation blue; Spectral speaks, system mono files; hairlines
   and 1px ink borders, no shadows, square corners. The page adds three
   instruments: the bench, the run, and the comparison — drawn from the
   same tokens. Opens cold from file://; no network requests. */

@font-face {
  font-family: "Spectral";
  src: url("fonts/spectral-latin-400-normal.woff2") format("woff2");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Spectral";
  src: url("fonts/spectral-latin-400-italic.woff2") format("woff2");
  font-weight: 400;
  font-style: italic;
  font-display: swap;
}
@font-face {
  font-family: "Spectral";
  src: url("fonts/spectral-latin-700-normal.woff2") format("woff2");
  font-weight: 700;
  font-style: normal;
  font-display: swap;
}

:root {
  --paper: #faf9f6;
  --card: #ffffff;
  --ink: #201e1b;
  --ink-2: #5a554c;
  --rule: #d9d4c9;
  --blue: #274690;
  --serif: "Spectral", Georgia, "Times New Roman", serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
}

* { box-sizing: border-box; }

html {
  scrollbar-color: var(--ink-2) var(--rule);
  scrollbar-width: thin;
}

@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 1.0625rem;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

::selection { background: rgba(39, 70, 144, 0.16); }

a {
  color: var(--blue);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
}
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 2px solid var(--blue); outline-offset: 2px; }

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

.noscript {
  max-width: 68ch;
  margin: 1.5rem auto 0;
  padding: 1rem 1.25rem;
  border: 1px solid var(--ink);
  background: var(--card);
  font-family: var(--mono);
  font-size: 0.875rem;
}

/* ---------- masthead ---------- */

.masthead {
  max-width: 72rem;
  margin: 0 auto;
  padding: clamp(3rem, 7vw, 5.5rem) clamp(1.25rem, 4vw, 3rem) 2.25rem;
}

.masthead-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
  gap: clamp(2rem, 4vw, 4rem);
  align-items: end;
}

.masthead h1 {
  margin: 0;
  font-size: clamp(2.6rem, 6.5vw, 4rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.02;
}

.masthead-sub {
  margin: 0.4rem 0 0;
  font-size: clamp(1.25rem, 2.6vw, 1.6rem);
  font-style: italic;
  color: var(--ink-2);
}

.masthead-lede {
  max-width: 58ch;
  margin: 1.5rem 0 0;
  font-size: 1.125rem;
}

.masthead-facts {
  margin: 1.25rem 0 0;
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.01em;
  color: var(--ink-2);
}

.rail {
  margin-top: 2.5rem;
  padding-top: 0.9rem;
  border-top: 2px solid var(--ink);
  display: flex;
  flex-wrap: wrap;
  gap: 0.2rem 1.4rem;
}

.rail a {
  font-family: var(--mono);
  font-size: 0.8125rem;
  letter-spacing: 0.01em;
  color: var(--ink-2);
  text-decoration: none;
}
.rail a:hover { color: var(--ink); text-decoration: underline; text-underline-offset: 3px; }
.rail a.on { color: var(--blue); }

/* ---------- sections ---------- */

main {
  max-width: 72rem;
  margin: 0 auto;
  padding: 0 clamp(1.25rem, 4vw, 3rem);
}

.sec {
  padding-top: 3rem;
  padding-bottom: 3rem;
  border-top: 1px solid var(--rule);
}

.sec h2 {
  margin: 0 0 1rem;
  font-size: clamp(1.7rem, 3.4vw, 2.2rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.015em;
}

.sec p {
  max-width: 68ch;
  margin: 0 0 1rem;
}

.sec p.lede {
  font-size: 1.125rem;
}

.sec strong { font-weight: 700; }
.sec em { font-style: italic; }
code {
  font-family: var(--mono);
  font-size: 0.85em;
  letter-spacing: 0.01em;
}

.sub2 {
  margin: 1.75rem 0 0.75rem;
  font-size: 1.25rem;
  font-weight: 700;
  max-width: 68ch;
}

.prov {
  display: block;
  max-width: 68ch;
  margin-top: 1.25rem;
  font-family: var(--mono);
  font-size: 0.75rem;
  line-height: 1.6;
  color: var(--ink-2);
}

.eq {
  max-width: 68ch;
  margin: 1.25rem 0;
  padding: 0.75rem 1rem;
  background: var(--card);
  border: 1px solid var(--ink);
  font-family: var(--mono);
  font-size: 0.875rem;
  line-height: 1.9;
  overflow-x: auto;
}

/* ---------- figures ---------- */

.fig {
  margin: 1.5rem 0;
  padding: 0.75rem;
  background: var(--card);
  border: 1px solid var(--ink);
  max-width: 68ch;
}

.fig svg { display: block; width: 100%; height: auto; }

.fig-title {
  display: block;
  margin: 0 0 0.35rem;
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink);
}

.fig figcaption {
  padding-top: 0.6rem;
  font-size: 0.9375rem;
  line-height: 1.55;
}

.fig .prov { margin-top: 0.5rem; }

/* ---------- instruments: shared chrome ---------- */

.ctl {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(11rem, 1fr));
  gap: 1rem 1.5rem;
  align-items: end;
  margin: 1.25rem 0;
  max-width: 68ch;
}

.ctl label, .ctl .lab {
  display: block;
  font-family: var(--mono);
  font-size: 0.6875rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-2);
  margin: 0 0 0.3rem;
}

.ctl select {
  width: 100%;
  padding: 0.35rem 0.5rem;
  font-family: var(--mono);
  font-size: 0.8125rem;
  color: var(--ink);
  background: var(--card);
  border: 1px solid var(--ink);
  border-radius: 0;
}

.ctl input[type="range"] {
  width: 100%;
  accent-color: var(--blue);
  background: transparent;
}

.ctl .val {
  font-family: var(--mono);
  font-size: 0.8125rem;
  font-variant-numeric: tabular-nums;
  color: var(--ink);
  text-transform: none;
  letter-spacing: 0;
}

.btnrow { display: flex; gap: 0; }

.btn {
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.02em;
  color: var(--ink-2);
  background: var(--card);
  border: 1px solid var(--rule);
  border-radius: 0;
  padding: 0.4rem 0.7rem;
  cursor: pointer;
  margin-left: -1px;
  white-space: nowrap;
}
.btn:first-child { margin-left: 0; }
.btn:hover { color: var(--ink); border-color: var(--ink-2); }
.btn[aria-pressed="true"] {
  color: var(--ink);
  border-color: var(--ink);
  position: relative;
  z-index: 1;
}

.btn-quiet {
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--ink-2);
  background: none;
  border: none;
  padding: 0.4rem 0;
  cursor: pointer;
  text-decoration: underline;
  text-underline-offset: 3px;
}
.btn-quiet:hover { color: var(--ink); }

/* ---------- the bench ---------- */

.bench { max-width: 68ch; }

.bench-bar {
  position: relative;
  height: 2rem;
  margin: 2.9rem 0 3.1rem;
  background: var(--card);
  border: 1px solid var(--ink);
}

.bar-fill {
  position: absolute;
  top: 0; bottom: 0; left: 0; right: 0;
  transform-origin: 0 50%;
  background: var(--ink);
}
@media (prefers-reduced-motion: no-preference) {
  .bar-fill { transition: transform 0.18s ease-out; }
}

.bar-mark {
  position: absolute;
  top: -0.5rem; bottom: -0.5rem;
  width: 0;
  border-left: 2px solid var(--ink);
}
.bar-mark-rest {
  border-left: 2px dashed var(--ink-2);
  top: -0.7rem; bottom: -0.7rem;
}
.bar-lab {
  position: absolute;
  font-family: var(--mono);
  font-size: 0.6875rem;
  line-height: 1.2;
  white-space: nowrap;
  color: var(--ink);
}
.bar-lab-rest { color: var(--ink-2); }
.bar-lab.up { top: -2.6rem; }
.bar-lab.down { top: calc(100% + 0.6rem); }

.bar-ends {
  position: absolute;
  left: 0; right: 0;
  top: calc(100% + 1.9rem);
  display: flex;
  justify-content: space-between;
  font-family: var(--mono);
  font-size: 0.6875rem;
  color: var(--ink-2);
}

.ro {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(8.5rem, 1fr));
  gap: 0.5rem;
  margin: 1rem 0;
}

.ro-cell {
  padding: 0.5rem 0.6rem 0.55rem;
  background: var(--card);
  border: 1px solid var(--ink);
}

.ro-lab {
  display: block;
  font-family: var(--mono);
  font-size: 0.6875rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-2);
}

.ro-num {
  display: block;
  margin-top: 0.15rem;
  font-family: var(--mono);
  font-size: 1.0625rem;
  font-variant-numeric: tabular-nums;
  color: var(--ink);
}

.ro-note {
  display: block;
  margin-top: 0.15rem;
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--ink-2);
}

/* the curve plate */

.curve { margin: 1.25rem 0; }
.curve svg {
  display: block;
  width: 100%;
  height: auto;
  background: var(--card);
  border: 1px solid var(--ink);
}

/* ---------- compare bench ---------- */

.cmp { max-width: 68ch; }

.cmp-row {
  display: grid;
  grid-template-columns: 7rem minmax(0, 1fr);
  gap: 0.75rem 1rem;
  align-items: center;
  padding: 0.9rem 0;
  border-top: 1px solid var(--rule);
}
.cmp-row:first-child { border-top: none; }

.cmp-head {
  font-family: var(--mono);
  font-size: 0.8125rem;
  color: var(--ink);
}
.cmp-head .ro-note { margin-top: 0.2rem; }

.cmp-bar {
  position: relative;
  height: 1.5rem;
  background: var(--card);
  border: 1px solid var(--ink);
}

.cmp-bar .bar-fill { top: 0; bottom: 0; }
.cmp-bar .bar-mark { top: -0.35rem; bottom: -0.35rem; }
.cmp-bar .bar-mark-rest { top: -0.5rem; bottom: -0.5rem; }

.cmp-band {
  position: absolute;
  top: 0; bottom: 0;
  left: 40%; right: 40%;
  background: var(--rule);
  opacity: 0.4;
}

.cmp-read {
  font-family: var(--mono);
  font-size: 0.75rem;
  font-variant-numeric: tabular-nums;
  color: var(--ink-2);
  margin-top: 0.3rem;
}

/* ---------- tables and rows ---------- */

.twrap {
  max-width: 68ch;
  margin: 1.25rem 0;
  background: var(--card);
  border: 1px solid var(--ink);
  overflow-x: auto;
}

.twrap.wide { max-width: 72rem; }

table.ledger {
  width: 100%;
  border-collapse: collapse;
}

.ledger th {
  padding: 0.5rem 0.6rem;
  font-family: var(--mono);
  font-size: 0.6875rem;
  font-weight: 400;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-2);
  text-align: left;
  border-bottom: 1px solid var(--ink);
  white-space: nowrap;
}

.ledger td {
  padding: 0.45rem 0.6rem;
  font-family: var(--mono);
  font-size: 0.8125rem;
  font-variant-numeric: tabular-nums;
  vertical-align: top;
}

.ledger tr + tr td { border-top: 1px solid var(--rule); }
.ledger td.num, .ledger th.num { text-align: right; white-space: nowrap; }
.ledger td .ro-note { margin-top: 0.1rem; }

.rows { max-width: 68ch; margin: 1.25rem 0; }

.row {
  display: grid;
  grid-template-columns: 11rem minmax(0, 1fr);
  gap: 0.25rem 1.25rem;
  padding: 0.6rem 0;
  border-top: 1px solid var(--rule);
}
.row:first-child { border-top: 1px solid var(--ink); }

.row-name {
  font-family: var(--mono);
  font-size: 0.8125rem;
  letter-spacing: 0.01em;
  color: var(--ink);
}

.row-text { font-size: 1rem; }
.row-text .ro-note { margin-top: 0.15rem; }

.tag {
  display: inline-block;
  padding: 0.05rem 0.4rem;
  font-family: var(--mono);
  font-size: 0.6875rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ink);
  background: var(--card);
  border: 1px solid var(--ink);
}
.tag-fade { color: var(--ink-2); border-color: var(--ink-2); }

.mono-list {
  max-width: 68ch;
  font-family: var(--mono);
  font-size: 0.8125rem;
  line-height: 2;
  color: var(--ink);
}

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

.colophon {
  max-width: 72rem;
  margin: 2rem auto 0;
  padding: 1.25rem clamp(1.25rem, 4vw, 3rem) 3rem;
  border-top: 1px solid var(--rule);
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--ink-2);
}

/* ---------- responsive ---------- */

@media (max-width: 900px) {
  .masthead-grid { grid-template-columns: 1fr; align-items: start; }
  .ctl { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 640px) {
  .ctl { grid-template-columns: 1fr; }
  .cmp-row { grid-template-columns: 1fr; gap: 0.4rem; }
  .row { grid-template-columns: 1fr; }
  .bar-lab { font-size: 0.625rem; }
  .ledger th { font-size: 0.6rem; letter-spacing: 0.04em; }
  .ledger td { font-size: 0.72rem; padding: 0.35rem 0.45rem; }
}