/* The Attribution Book: teaching-instrument genre, fourth sibling and first
 * provider-side page. Neutral paper like The Risk Book, navy structure, one
 * pine accent reserved for "counted": the in-roster state, the counts, the
 * bars. Design pass done 2026-08-15: the original pine #1a6a50 failed the
 * dataviz validator's chroma floor (0.087, reads gray) and the normal-vision
 * separation floor against navy (dE 13.7 < 15), so the accent was re-stepped
 * to #0d6e4b, which passes every check (dev/palette.html) while keeping text
 * contrast 6.27 card / 5.72 paper / 5.43 tint. Full 28-pair sweep of every
 * used fg/bg combination passed, with on-body text measured against the
 * paper BLENDED with each body-gradient wash at full alpha (the landing-page
 * lesson: the backdrop under text is not bare --paper). */

:root {
  --paper: #f5f4f6;
  --card: #ffffff;
  --ink: #1b1d24;
  --ink-soft: #474b56;
  --ink-faint: #63666f;
  --navy: #27548c;
  --pine: #0d6e4b;        /* accent: counted, counts, bars (validator-stepped) */
  --pine-ink: #114536;    /* emphasis text */
  --pine-tint: #e7f1ec;
  --pine-edge: #b5d5c7;
  --out: #5c5f66;         /* not-counted state text; Risk Book's --zero lesson */
  --rule: #e0dfe3;
  --spine-bg: #16211c;
  --spine-label: #93a49b;
  --spine-value: #a9dcc6;
  --spine-op: #7e8f86;
  --spine-context: #bccec5;
  color-scheme: light;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background:
    radial-gradient(900px 420px at 12% -10%, rgba(39, 84, 140, 0.07), transparent 60%),
    radial-gradient(700px 380px at 90% 0%, rgba(26, 106, 80, 0.07), transparent 55%),
    var(--paper);
  color: var(--ink);
  font-family: "Public Sans", system-ui, sans-serif;
  line-height: 1.6;
}

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

a { color: var(--navy); text-decoration-thickness: 1px; text-underline-offset: 2px; }
a:hover { color: var(--pine-ink); }

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

.back {
  position: absolute;
  top: 18px;
  left: 22px;
  font-family: "IBM Plex Mono", monospace;
  font-size: 13px;
  color: var(--ink-faint);
  text-decoration: none;
}
.back:hover { color: var(--ink); }

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

.masthead {
  max-width: 860px;
  margin: 0 auto;
  padding: 84px 24px 8px;
}

.wordmark {
  display: flex;
  align-items: center;
  gap: 14px;
  margin: 0 0 10px;
  font-family: "IBM Plex Mono", monospace;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.16em;
  color: var(--ink-soft);
}

.attr-flourish { width: 138px; height: 26px; flex: none; }
.af-row { fill: var(--pine-edge); }
.af-mark { fill: var(--pine); }
.af-1 { animation: af-pop 0.5s ease-out 0.2s backwards; }
.af-2 { animation: af-pop 0.5s ease-out 0.45s backwards; }
.af-3 { animation: af-pop 0.5s ease-out 0.7s backwards; }
@keyframes af-pop { from { opacity: 0; transform: translateX(-6px); } }
@media (prefers-reduced-motion: reduce) {
  .af-1, .af-2, .af-3 { animation: none; }
}

.masthead h1 {
  margin: 0 0 14px;
  font-size: clamp(30px, 5vw, 44px);
  line-height: 1.12;
  letter-spacing: -0.015em;
  font-weight: 800;
}

.lede {
  max-width: 64ch;
  margin: 0 0 14px;
  font-size: 17px;
  color: var(--ink-soft);
}

.meta-line {
  margin: 0 0 26px;
  font-family: "IBM Plex Mono", monospace;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--ink-faint);
}

/* ---------- spine ---------- */

.spine {
  position: sticky;
  top: 0;
  z-index: 30;
  background: var(--spine-bg);
  padding: 12px 24px 10px;
  box-shadow: 0 2px 14px rgba(20, 28, 24, 0.25);
}

.spine-inner {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
}

.flow-step { display: flex; flex-direction: column; }

.flow-label {
  font-family: "IBM Plex Mono", monospace;
  font-size: 10px;
  letter-spacing: 0.1em;
  color: var(--spine-label);
}

.flow-value {
  font-family: "IBM Plex Mono", monospace;
  font-size: 22px;
  font-weight: 600;
  color: var(--spine-value);
  font-variant-numeric: tabular-nums;
}

.flow-op {
  font-family: "IBM Plex Mono", monospace;
  font-size: 16px;
  color: var(--spine-op);
}

.spine-context {
  max-width: 860px;
  margin: 6px auto 0;
  font-size: 12.5px;
  color: var(--spine-context);
}

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

main { max-width: 860px; margin: 0 auto; padding: 8px 24px 40px; }

.chapter { padding: 38px 0 6px; border-bottom: 1px solid var(--rule); }
.chapter:last-of-type { border-bottom: none; }

.ch-kicker {
  margin: 0 0 6px;
  font-family: "IBM Plex Mono", monospace;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--pine);
  font-weight: 600;
}

.chapter h2 {
  margin: 0 0 14px;
  font-size: 27px;
  letter-spacing: -0.01em;
}

.chapter h3 { margin: 22px 0 8px; font-size: 18.5px; }

.chapter p { max-width: 68ch; }

.rule-list { max-width: 68ch; padding-left: 20px; }
.rule-list li { margin-bottom: 8px; }

/* ---------- panels ---------- */

.panel {
  background: var(--card);
  border: 1px solid var(--rule);
  border-radius: 10px;
  padding: 18px 20px;
  margin: 20px 0 24px;
  box-shadow: 0 1px 3px rgba(27, 29, 36, 0.05);
}

.panel-title {
  margin: 0 0 10px;
  font-family: "IBM Plex Mono", monospace;
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.13em;
  color: var(--ink-faint);
}

.panel-sub { margin: -4px 0 12px; font-size: 13.5px; color: var(--ink-soft); }

.base-note { margin: 12px 0 0; font-size: 13px; color: var(--ink-faint); max-width: 68ch; }

.ctl-label {
  display: block;
  font-family: "IBM Plex Mono", monospace;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--ink-faint);
  margin-bottom: 4px;
}

/* ---------- roster table ---------- */

.roster-scroll { overflow-x: auto; }

.roster {
  border-collapse: collapse;
  width: 100%;
  font-size: 13.5px;
}

.roster th {
  text-align: left;
  font-family: "IBM Plex Mono", monospace;
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--ink-faint);
  border-bottom: 2px solid var(--rule);
  padding: 6px 10px;
  position: sticky;
  top: 0;
}

.roster td { border-bottom: 1px solid var(--rule); padding: 5px 10px; }

.roster tbody tr { cursor: pointer; }
.roster tbody tr:hover { background: var(--pine-tint); }
.roster tbody tr.selected { background: var(--pine-tint); outline: 2px solid var(--pine-edge); outline-offset: -2px; }

.roster .pt-label { font-family: "IBM Plex Mono", monospace; font-size: 12.5px; white-space: nowrap; }
.roster .pt-case { color: var(--ink-faint); font-size: 12px; }

.mark-in { color: var(--pine); font-weight: 700; }
.mark-out { color: var(--out); }
.mark-in.demo, .mark-out.demo { font-size: 13px; }
.plur-org { font-size: 12.5px; white-space: nowrap; }

/* ---------- drill panel ---------- */

.drill-head { display: flex; align-items: flex-end; gap: 18px; flex-wrap: wrap; margin-bottom: 8px; }

/* max-width guards: the select's intrinsic width is its longest mono option,
 * which is wider than a phone. Without these it forces document overflow. */
.patient-ctl { max-width: 100%; min-width: 0; }

.patient-ctl select {
  font: 500 14px "IBM Plex Mono", monospace;
  padding: 8px 10px;
  border: 1px solid var(--rule);
  border-radius: 8px;
  background: var(--card);
  color: var(--ink);
  min-height: 44px;
  max-width: 100%;
}

.drill-facts { margin: 0 0 6px; font-size: 12.5px; color: var(--ink-soft); }

.drill-lesson {
  margin: 4px 0 14px;
  padding: 10px 14px;
  background: var(--pine-tint);
  border-left: 3px solid var(--pine);
  border-radius: 0 8px 8px 0;
  font-size: 14px;
  max-width: none;
}

.nudges { margin: 14px 0; padding: 14px 16px; border: 1px dashed var(--pine-edge); border-radius: 10px; }

.nudge-controls { display: flex; gap: 18px; flex-wrap: wrap; align-items: flex-start; }

.nudge { display: flex; align-items: center; gap: 8px; font-size: 13.5px; min-height: 44px; }
.nudge input { width: 18px; height: 18px; accent-color: var(--pine); }

.nudge-seg { border: none; margin: 0; padding: 0; }
.nudge-seg label { display: inline-flex; align-items: center; gap: 5px; margin-right: 12px; font-size: 13.5px; min-height: 32px; }
.nudge-seg input { accent-color: var(--pine); }

/* ---------- verdict cards ---------- */

.verdicts { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 12px; margin: 14px 0; }

.verdict {
  border: 1px solid var(--rule);
  border-radius: 10px;
  padding: 12px 14px;
  background: var(--card);
}
.verdict.in { border-color: var(--pine-edge); background: var(--pine-tint); }

.verdict-head { display: flex; justify-content: space-between; align-items: baseline; gap: 8px; margin-bottom: 6px; }
.verdict-name { font-family: "IBM Plex Mono", monospace; font-size: 11px; letter-spacing: 0.1em; color: var(--ink-faint); }
.verdict-result { font-weight: 700; font-size: 14px; }
.verdict.in .verdict-result { color: var(--pine-ink); }
.verdict:not(.in) .verdict-result { color: var(--out); }
.verdict-flip { font-size: 12px; font-family: "IBM Plex Mono", monospace; color: var(--navy); margin-left: 6px; }

.chain-list { list-style: none; margin: 0; padding: 0; }
.chain-list li {
  font-size: 12.5px;
  padding: 3px 0 3px 16px;
  position: relative;
  color: var(--ink-soft);
}
.chain-list li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 9px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  /* default matches .stop: every chain item is pass or stop, and a
   * pine-edge dot measures 1.58:1 on card (caught in the design pass) */
  background: var(--out);
}
.chain-list li.pass::before { background: var(--pine); }
.chain-list li.stop::before { background: var(--out); }
.chain-step { font-family: "IBM Plex Mono", monospace; font-size: 11px; letter-spacing: 0.06em; color: var(--ink-faint); margin-right: 4px; text-transform: uppercase; }

/* ---------- timeline ---------- */

.timeline-wrap { margin-top: 14px; overflow-x: auto; }

.timeline { border-collapse: collapse; width: 100%; font-size: 12.5px; }
.timeline th {
  text-align: left;
  font-family: "IBM Plex Mono", monospace;
  font-size: 10.5px;
  letter-spacing: 0.08em;
  color: var(--ink-faint);
  border-bottom: 2px solid var(--rule);
  padding: 4px 10px;
}
.timeline td { border-bottom: 1px solid var(--rule); padding: 4px 10px; }
.timeline .t-date, .timeline .t-code, .timeline .t-money { font-family: "IBM Plex Mono", monospace; font-size: 12px; white-space: nowrap; }
.timeline tr.nudged td { background: var(--pine-tint); }
.timeline tr.outside-window td { color: var(--ink-faint); }

/* ---------- churn figure ---------- */

.churn-figure {
  display: flex;
  align-items: flex-end;
  gap: 2px;                       /* 2px surface gap between fills */
  height: 180px;
  padding: 8px 4px 0;
}

.churn-bar {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  align-items: center;
  gap: 6px;
  min-width: 0;
}

.churn-bar .bar {
  width: 100%;
  max-width: 92px;
  background: var(--pine);
  border-radius: 4px 4px 0 0;      /* rounded data end, flat baseline */
  transition: height 0.35s ease;
}

.churn-bar .bar-value {
  font-family: "IBM Plex Mono", monospace;
  font-size: 13px;
  font-weight: 600;
  color: var(--pine-ink);
  font-variant-numeric: tabular-nums;
}

.churn-bar .bar-label {
  font-family: "IBM Plex Mono", monospace;
  font-size: 11px;
  color: var(--ink-faint);
  padding-bottom: 2px;
}

.churn-picker { display: flex; gap: 8px; flex-wrap: wrap; margin: 16px 0 4px; }

.churn-picker button {
  font: 500 12.5px "IBM Plex Mono", monospace;
  padding: 8px 12px;
  min-height: 44px;
  border: 1px solid var(--rule);
  border-radius: 8px;
  background: var(--card);
  color: var(--ink-soft);
  cursor: pointer;
}
.churn-picker button:hover { border-color: var(--pine-edge); }
.churn-picker button[aria-pressed="true"] {
  background: var(--pine-tint);
  border-color: var(--pine);
  color: var(--pine-ink);
  font-weight: 600;
}

.churn-diff { margin-top: 10px; }
.churn-diff h4 { margin: 10px 0 4px; font-size: 13.5px; }
.churn-diff .diff-empty { font-size: 13px; color: var(--ink-faint); }

.diff-row {
  display: flex;
  gap: 10px;
  align-items: baseline;
  padding: 5px 0;
  border-bottom: 1px dashed var(--rule);
  font-size: 13px;
}
.diff-row .pt-label { font-family: "IBM Plex Mono", monospace; font-size: 12.5px; white-space: nowrap; }
.diff-row .diff-dir { font-weight: 700; }
.diff-row .diff-dir.entered { color: var(--pine-ink); }
.diff-row .diff-dir.left { color: var(--out); }
.diff-row .diff-why { color: var(--ink-soft); }

/* ---------- sources & footer ---------- */

.source-list { max-width: 72ch; padding-left: 20px; font-size: 14px; }
.source-list li { margin-bottom: 10px; }

.foot {
  max-width: 860px;
  margin: 0 auto;
  padding: 18px 24px 40px;
  color: var(--ink-faint);
  font-size: 13px;
}

/* ---------- mobile ---------- */

@media (max-width: 640px) {
  .masthead { padding-top: 72px; }
  .spine-inner { gap: 12px; }
  .flow-value { font-size: 18px; }
  .drill-head { flex-direction: column; align-items: stretch; }
  .verdicts { grid-template-columns: 1fr; }
  .churn-figure { height: 150px; }
}