/* The Rate Book: "teaching instrument" aesthetic. Warm paper, one money-green
   accent reserved for dollar values, navy for structure and citations, amber
   strictly for cap warnings (always with a text label, never color alone).
   Light-only per the sitewide rule. Contrast pairs computed, not eyeballed;
   see the design notes in NOTES.md. */

* { box-sizing: border-box; }

:root {
  --paper: #f7f6f1;
  --card: #ffffff;
  --ink: #1d232a;
  --ink-soft: #47515b;
  --ink-faint: #67717c;
  --money: #0b6b4f;
  --navy: #27548c;
  --cap: #96570a;
  --rule: #e5e2d8;
  --spine-bg: #20242b;
  --spine-label: #97a3b0;
  --spine-value: #8fdcb8;
  --spine-op: #6b7783;
  --spine-context: #b9c3cd;
  --spine-rule: #363d47;
  color-scheme: light;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: "Public Sans", system-ui, sans-serif;
  line-height: 1.65;
  padding: 22px 20px 80px;
}

.mono { font-family: "IBM Plex Mono", monospace; }

.back {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.8rem;
  color: var(--ink-faint);
  text-decoration: none;
}
.back:hover { color: var(--ink); }

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

.masthead { max-width: 720px; margin: 52px auto 36px; }

.wordmark {
  font-family: "IBM Plex Mono", monospace;
  font-weight: 600;
  font-size: 0.85rem;
  letter-spacing: 0.14em;
  color: var(--money);
  margin: 0 0 10px;
  display: inline-flex;
  flex-direction: column;
  gap: 2px;
}
/* Signature flourish: the quartile staircase (95 / 100 / 107.5 / 115), drawn
   in on load. */
.stairs { width: 120px; height: 18px; color: var(--money); }
.stairs path {
  stroke-dasharray: 160;
  stroke-dashoffset: 160;
  animation: draw-stairs 1.1s ease-out 0.2s forwards;
}
@keyframes draw-stairs { to { stroke-dashoffset: 0; } }

.masthead h1 {
  font-size: clamp(1.8rem, 5vw, 2.5rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.12;
  margin: 0 0 14px;
}
.lede { color: var(--ink-soft); font-size: 1.08rem; max-width: 58ch; margin: 0 0 14px; }
.meta-line {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  color: var(--ink-faint);
  margin: 0;
}

/* ---- the persistent dollar-flow spine ---- */

.spine {
  position: sticky;
  top: 10px;
  z-index: 10;
  background: var(--spine-bg);
  color: #f2f4f6;
  border-radius: 12px;
  max-width: 860px;
  margin: 0 auto 56px;
  padding: 14px 18px 10px;
  box-shadow: 0 10px 30px rgba(29, 35, 42, 0.18);
}
.spine-inner { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.flow-step { display: flex; flex-direction: column; min-width: 92px; }
.flow-label {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.6rem;
  letter-spacing: 0.08em;
  color: var(--spine-label);
}
.flow-value {
  font-family: "IBM Plex Mono", monospace;
  font-size: 1.08rem;
  font-weight: 600;
  color: var(--spine-value);
  font-variant-numeric: tabular-nums;
}
.flow-value.flash { animation: value-flash 0.45s ease-out; }
@keyframes value-flash {
  0% { color: #ffffff; }
  100% { color: var(--spine-value); }
}
.flow-note { font-size: 0.68rem; color: #e8b96a; }
.flow-op { color: var(--spine-op); font-size: 1.1rem; }
.spine-context {
  margin: 9px 0 0;
  font-size: 0.83rem;
  color: var(--spine-context);
  border-top: 1px solid var(--spine-rule);
  padding-top: 8px;
}

main { max-width: 720px; margin: 0 auto; }

/* ---- chapters ---- */

.chapter { margin: 0 0 72px; }
.ch-mark {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--navy);
  margin: 0 0 6px;
}
.chapter h2 { font-size: 1.55rem; letter-spacing: -0.01em; margin: 0 0 12px; }
.chapter p { max-width: 66ch; }

/* ---- controls ---- */

.control-card {
  position: relative;
  background: var(--card);
  border: 1px solid var(--rule);
  border-radius: 12px;
  padding: 18px 20px;
  margin: 22px 0;
  box-shadow: 0 2px 10px rgba(29, 35, 42, 0.04);
}
.control-label {
  display: block;
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--ink-soft);
  margin-bottom: 10px;
}
.control-card input[type="text"] {
  width: 100%;
  font: inherit;
  padding: 9px 12px;
  border: 1px solid var(--rule);
  border-radius: 8px;
  background: var(--paper);
}
.control-card input[type="text"]:focus {
  outline: 2px solid var(--navy);
  outline-offset: 1px;
}
.control-card input[type="range"] { width: 100%; accent-color: var(--money); margin: 4px 0 0; }
.control-sub { font-size: 0.92rem; color: var(--ink-soft); margin: 10px 0 0; }

.tick-row {
  display: flex;
  justify-content: space-between;
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.62rem;
  color: var(--ink-faint);
  padding: 2px 6px 0;
}

.county-results {
  position: absolute;
  left: 20px; right: 20px;
  background: var(--card);
  border: 1px solid var(--rule);
  border-radius: 8px;
  list-style: none;
  margin: 4px 0 0;
  padding: 4px 0;
  max-height: 260px;
  overflow-y: auto;
  box-shadow: 0 10px 28px rgba(29, 35, 42, 0.14);
  z-index: 20;
}
.county-results li { padding: 7px 14px; cursor: pointer; font-size: 0.92rem; }
.county-results li:hover { background: var(--paper); }

.county-facts { margin-top: 14px; font-size: 0.93rem; color: var(--ink-soft); }
.county-facts strong { color: var(--ink); }

/* ---- tier table ---- */

.tier-table table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  background: var(--card);
  border: 1px solid var(--rule);
  border-radius: 12px;
  overflow: hidden;
  font-size: 0.95rem;
}
.tier-table th, .tier-table td { text-align: left; padding: 9px 16px; border-bottom: 1px solid var(--rule); }
.tier-table th {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.66rem;
  letter-spacing: 0.1em;
  color: var(--ink-faint);
  background: var(--paper);
}
.tier-table tr:last-child td { border-bottom: none; }
.tier-table td.mono { color: var(--money); font-weight: 600; font-variant-numeric: tabular-nums; }
.capflag { color: var(--cap); font-family: "IBM Plex Mono", monospace; font-size: 0.72rem; letter-spacing: 0.06em; }

/* ---- gates ---- */

.gate-row { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 12px; }
.gate {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.72rem;
  padding: 5px 11px;
  border-radius: 999px;
  border: 1px solid var(--rule);
  color: var(--ink-faint);
  background: var(--card);
  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}
.gate-open { border-color: var(--money); color: var(--money); background: #ecf6f0; }

/* ---- finding card ---- */

.finding-card {
  background: var(--spine-bg);
  color: #e8ecef;
  border-radius: 12px;
  padding: 20px 22px;
  margin: 26px 0 0;
}
.finding-card .ch-mark { color: #8fb3e8; }
.finding-card p:last-child { margin: 0; max-width: none; }
.finding-card strong { color: var(--spine-value); }

/* ---- caveats, sources, footer ---- */

.caveat {
  font-size: 0.86rem;
  color: var(--ink-soft);
  border-left: 3px solid var(--rule);
  padding-left: 14px;
}

.sources ul { padding-left: 20px; font-size: 0.9rem; color: var(--ink-soft); }
.sources li { margin-bottom: 6px; }
.sources a { color: var(--navy); }

.foot {
  max-width: 720px;
  margin: 44px auto 0;
  padding-top: 18px;
  border-top: 1px solid var(--rule);
  font-size: 0.8rem;
  color: var(--ink-faint);
}

:focus-visible { outline: 2px solid var(--navy); outline-offset: 3px; }

@media (prefers-reduced-motion: reduce) {
  .stairs path { animation: none; stroke-dashoffset: 0; }
  .flow-value.flash { animation: none; }
  .gate { transition: none; }
}

@media (max-width: 560px) {
  body { padding: 16px 14px 60px; }
  .masthead { margin-top: 36px; }
  .spine { position: static; }
  .spine-inner { gap: 8px; }
  .flow-step { min-width: 84px; }
  .flow-value { font-size: 0.92rem; }
  .control-card { padding: 14px 14px; }
  .county-results { left: 14px; right: 14px; }
}