/* FAR/AMT Chart Room — design system (same family as CFI Chart Room)
   Paper: sectional-chart cream. LSR: maintenance-tag rust. AMT: zinc-chromate teal. */

:root {
  --paper: #f5f0e4;
  --paper-2: #efe8d8;
  --paper-3: #e7ddc8;
  --ink: #22262e;
  --ink-soft: #4b5261;
  --ink-faint: #8a8f9c;
  --rust: #b0492a;      /* LSR — red maintenance tag */
  --rust-deep: #843219;
  --teal: #2e6a63;         /* AMT — zinc-chromate teal */
  --teal-deep: #1f4b46;
  --green: #3e6b4f;        /* correct */
  --red: #a13c2f;          /* wrong */
  --amber: #b07c26;
  --line: #d8ccb2;
  --card-shadow: 0 1px 2px rgba(34,38,46,.08), 0 6px 24px -8px rgba(34,38,46,.18);
  --font-display: "Barlow Condensed", sans-serif;
  --font-body: "Source Serif 4", Georgia, serif;
  --font-mono: "IBM Plex Mono", monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.6;
  /* graticule: faint chart grid */
  background-image:
    linear-gradient(rgba(46,106,99,.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(46,106,99,.045) 1px, transparent 1px);
  background-size: 48px 48px;
}

/* ---------- header / nav ---------- */
.masthead {
  border-bottom: 3px double var(--ink);
  background: var(--paper);
  position: sticky; top: 0; z-index: 50;
  box-shadow: 0 2px 12px -6px rgba(34,38,46,.25);
}
.masthead-inner {
  max-width: 1040px; margin: 0 auto; padding: 10px 20px;
  display: flex; align-items: center; gap: 18px; flex-wrap: wrap;
}
.brand {
  font-family: var(--font-display);
  font-weight: 600; font-size: 22px; letter-spacing: .14em;
  text-transform: uppercase; text-decoration: none; color: var(--ink);
  display: flex; align-items: baseline; gap: 8px;
}
.brand .tick { color: var(--rust); }
.brand small {
  font-family: var(--font-mono); font-size: 10px; letter-spacing: .08em;
  color: var(--ink-faint); text-transform: none;
}
.nav { display: flex; gap: 2px; margin-left: auto; flex-wrap: wrap; }
.nav a {
  font-family: var(--font-display); font-weight: 500; font-size: 15px;
  letter-spacing: .12em; text-transform: uppercase;
  color: var(--ink-soft); text-decoration: none; padding: 6px 12px;
  border-bottom: 3px solid transparent;
}
.nav a:hover { color: var(--ink); background: var(--paper-2); }
.nav a.active { color: var(--ink); border-bottom-color: var(--rust); }
.nav a.active.amt { border-bottom-color: var(--teal); }

/* ---------- layout ---------- */
.wrap { max-width: 1040px; margin: 0 auto; padding: 28px 20px 80px; }
.wrap.narrow { max-width: 820px; }

/* ---------- dashboard ---------- */
.hero { margin: 30px 0 8px; }
.hero h1 {
  font-family: var(--font-display); font-weight: 600;
  font-size: clamp(42px, 7vw, 72px); line-height: .95;
  letter-spacing: .02em; text-transform: uppercase; margin: 0;
}
.hero h1 .lsr { color: var(--rust); }
.hero h1 .amt { color: var(--teal); }
.hero p.lede { font-size: 19px; color: var(--ink-soft); max-width: 640px; margin: 14px 0 0; }

.testgrid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 20px; margin: 36px 0; }
.testcard {
  background: #fffdf6; border: 1.5px solid var(--ink); border-radius: 4px;
  box-shadow: var(--card-shadow); padding: 22px 24px; position: relative;
  overflow: hidden;
}
.testcard::before {
  content: ""; position: absolute; inset: 0 auto 0 0; width: 7px;
}
.testcard.lsr::before { background: repeating-linear-gradient(180deg, var(--rust) 0 14px, transparent 14px 20px); }
.testcard.amt::before { background: repeating-linear-gradient(180deg, var(--teal) 0 14px, transparent 14px 20px); }
.testcard h2 {
  font-family: var(--font-display); font-weight: 600; font-size: 30px;
  letter-spacing: .06em; text-transform: uppercase; margin: 0 0 2px;
}
.testcard .code { font-family: var(--font-mono); font-size: 12px; color: var(--ink-faint); letter-spacing: .06em; }
.facts { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin: 16px 0; }
.fact { border-top: 2px solid var(--line); padding-top: 6px; }
.fact b { font-family: var(--font-mono); font-size: 20px; display: block; }
.fact span { font-family: var(--font-display); font-size: 12px; letter-spacing: .12em; text-transform: uppercase; color: var(--ink-faint); }
.actions { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 14px; }

.btn {
  font-family: var(--font-display); font-weight: 600; font-size: 15px;
  letter-spacing: .12em; text-transform: uppercase;
  padding: 9px 18px; border-radius: 3px; cursor: pointer; text-decoration: none;
  border: 1.5px solid var(--ink); background: var(--ink); color: var(--paper);
  transition: transform .08s ease, box-shadow .12s ease;
  display: inline-block;
}
.btn:hover { transform: translateY(-1px); box-shadow: 0 4px 10px -4px rgba(34,38,46,.5); }
.btn.ghost { background: transparent; color: var(--ink); }
.btn.lsr { background: var(--rust); border-color: var(--rust-deep); }
.btn.amt { background: var(--teal); border-color: var(--teal-deep); }
.btn:disabled { opacity: .45; cursor: not-allowed; transform: none; box-shadow: none; }

.statline { font-family: var(--font-mono); font-size: 13px; color: var(--ink-soft); }

/* ---------- reader (markdown) ---------- */
.reader { display: grid; grid-template-columns: 230px minmax(0,1fr); gap: 36px; align-items: start; }
@media (max-width: 900px) { .reader { grid-template-columns: minmax(0, 1fr); } .toc { position: static !important; max-height: none !important; } }
.toc {
  position: sticky; top: 76px; max-height: calc(100vh - 100px); overflow-y: auto;
  font-family: var(--font-display); font-size: 14px; letter-spacing: .04em;
  border-right: 1px solid var(--line); padding-right: 14px;
}
.toc a { display: block; color: var(--ink-soft); text-decoration: none; padding: 3px 0 3px 8px; border-left: 2px solid transparent; line-height: 1.35; }
.toc a:hover { color: var(--ink); }
.toc a.h3 { padding-left: 22px; font-size: 13px; color: var(--ink-faint); }
.toc a.here { border-left-color: var(--rust); color: var(--ink); }
.doc h1, .doc h2, .doc h3, .doc h4 {
  font-family: var(--font-display); font-weight: 600; letter-spacing: .03em;
  text-transform: uppercase; line-height: 1.1; scroll-margin-top: 84px;
}
.doc h1 { font-size: 40px; margin: 10px 0 4px; }
.doc h2 { font-size: 28px; margin: 44px 0 10px; padding-top: 14px; border-top: 2px solid var(--ink); }
.doc h2::before { content: "§ "; color: var(--rust); font-weight: 400; }
.doc.amt h2::before { color: var(--teal); }
.doc h3 { font-size: 21px; margin: 26px 0 6px; color: var(--ink-soft); }
.doc p { margin: 10px 0; }
.doc li { margin: 4px 0; }
.doc strong { background: linear-gradient(transparent 62%, rgba(176,73,42,.22) 62%); }
.doc.amt strong { background: linear-gradient(transparent 62%, rgba(46,106,99,.20) 62%); }
.doc code { font-family: var(--font-mono); font-size: .85em; background: var(--paper-3); padding: 1px 5px; border-radius: 3px; }
.doc table { border-collapse: collapse; margin: 14px 0; width: 100%; font-size: 15px; background: #fffdf6; }
.doc th { font-family: var(--font-display); letter-spacing: .08em; text-transform: uppercase; font-size: 13px; text-align: left; background: var(--ink); color: var(--paper); padding: 7px 10px; }
.doc td { border: 1px solid var(--line); padding: 6px 10px; vertical-align: top; }
.doc tr:nth-child(even) td { background: var(--paper-2); }
.doc blockquote { margin: 14px 0; padding: 10px 16px; border-left: 4px solid var(--amber); background: #fbf6e8; font-size: 15.5px; }
.doc hr { border: none; border-top: 1px dashed var(--line); margin: 30px 0; }
/* no link anywhere renders browser-default blue: inherit ink, highlight band */
a { color: inherit; }
.panel a, .footer-note a, .qfig a { text-decoration: none; background: linear-gradient(transparent 62%, rgba(176,73,42,.22) 62%); }
.panel a:hover, .footer-note a:hover, .qfig a:hover { background: linear-gradient(transparent 55%, rgba(176,73,42,.38) 55%); }
.doc a { color: inherit; text-decoration: none; background: linear-gradient(transparent 62%, rgba(176,73,42,.22) 62%); }
.doc a:hover { background: linear-gradient(transparent 55%, rgba(176,73,42,.38) 55%); }
.doc.amt a { background: linear-gradient(transparent 62%, rgba(46,106,99,.20) 62%); }
.doc.amt a:hover { background: linear-gradient(transparent 55%, rgba(46,106,99,.36) 55%); }
.doc strong a, .doc a strong { background: none; }
.doc strong a:hover { background: linear-gradient(transparent 55%, rgba(176,73,42,.30) 55%); }
.ref a { color: inherit; text-decoration: none; background: linear-gradient(transparent 62%, rgba(176,73,42,.22) 62%); }
.ref a:hover { background: linear-gradient(transparent 55%, rgba(176,73,42,.38) 55%); }
.doc.amt strong a:hover { background: linear-gradient(transparent 55%, rgba(46,106,99,.28) 55%); }

/* ---------- quiz ---------- */
.panel {
  background: #fffdf6; border: 1.5px solid var(--ink); border-radius: 4px;
  box-shadow: var(--card-shadow); padding: 24px 26px; margin: 18px 0;
}
.panel h2 { font-family: var(--font-display); font-weight: 600; font-size: 26px; letter-spacing: .06em; text-transform: uppercase; margin: 0 0 12px; }
.controls { display: flex; gap: 14px; flex-wrap: wrap; align-items: center; }
.controls label { font-family: var(--font-display); font-size: 14px; letter-spacing: .1em; text-transform: uppercase; color: var(--ink-soft); }
select, input[type="number"] {
  font-family: var(--font-mono); font-size: 15px; padding: 7px 10px;
  border: 1.5px solid var(--ink); border-radius: 3px; background: var(--paper); color: var(--ink);
}
.chips { display: flex; gap: 8px; flex-wrap: wrap; }
.chip {
  font-family: var(--font-display); font-size: 13px; letter-spacing: .08em; text-transform: uppercase;
  padding: 5px 12px; border: 1.5px solid var(--ink-soft); border-radius: 99px;
  background: transparent; color: var(--ink-soft); cursor: pointer;
}
.chip.on { background: var(--ink); color: var(--paper); border-color: var(--ink); }

.qmeta { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; font-family: var(--font-mono); font-size: 13px; color: var(--ink-soft); flex-wrap: wrap; }
.qmeta .timer { font-size: 17px; color: var(--ink); }
.qmeta .timer.low { color: var(--red); animation: blink 1s steps(2) infinite; }
@keyframes blink { 50% { opacity: .35; } }
.progressbar { height: 5px; background: var(--paper-3); border-radius: 99px; overflow: hidden; margin: 10px 0 18px; }
.progressbar i { display: block; height: 100%; background: var(--rust); transition: width .25s ease; }
.progressbar.amt i { background: var(--teal); }

.qtext { font-size: 19px; margin: 6px 0 6px; }
.qfig { font-family: var(--font-mono); font-size: 13px; color: var(--amber); margin: 0 0 10px; }
.choice {
  display: flex; gap: 12px; align-items: flex-start; width: 100%; text-align: left;
  font-family: var(--font-body); font-size: 16.5px; line-height: 1.5;
  background: var(--paper); border: 1.5px solid var(--line); border-radius: 4px;
  padding: 12px 14px; margin: 8px 0; cursor: pointer; color: var(--ink);
  transition: border-color .1s ease, background .1s ease;
}
.choice:hover:not(:disabled) { border-color: var(--ink); background: #fffdf6; }
.choice .key {
  font-family: var(--font-mono); font-weight: 600; font-size: 14px;
  border: 1.5px solid var(--ink-soft); border-radius: 3px; padding: 1px 7px; flex: none; margin-top: 2px;
}
.choice.picked { border-color: var(--ink); background: var(--paper-2); box-shadow: inset 0 0 0 1px var(--ink); }
.choice.right { border-color: var(--green); background: #eef3ea; box-shadow: inset 0 0 0 1.5px var(--green); }
.choice.wrong { border-color: var(--red); background: #f6ebe7; box-shadow: inset 0 0 0 1.5px var(--red); }
.choice:disabled { cursor: default; }
.explain {
  border-left: 4px solid var(--green); background: #eef3ea; padding: 12px 16px;
  margin: 12px 0; font-size: 15.5px; border-radius: 0 4px 4px 0;
}
.explain.miss { border-left-color: var(--red); background: #f6ebe7; }
.explain .ref { font-family: var(--font-mono); font-size: 12.5px; color: var(--ink-soft); display: block; margin-top: 6px; }

.scoreboard { text-align: center; padding: 30px 10px; }
.scoreboard .big {
  font-family: var(--font-display); font-weight: 600; font-size: 84px; line-height: 1;
}
.scoreboard .big.pass { color: var(--green); }
.scoreboard .big.fail { color: var(--red); }
.scoreboard .verdict { font-family: var(--font-display); font-size: 22px; letter-spacing: .18em; text-transform: uppercase; }
.missgrid { text-align: left; margin-top: 22px; }

/* ---------- flashcards ---------- */
.stage { perspective: 1400px; margin: 22px auto; max-width: 640px; }
.fcard {
  position: relative; width: 100%; min-height: 320px; cursor: pointer;
  transform-style: preserve-3d; transition: transform .45s cubic-bezier(.2,.7,.3,1);
}
.fcard.flip { transform: rotateY(180deg); }
.face {
  position: absolute; inset: 0; backface-visibility: hidden;
  display: flex; flex-direction: column; justify-content: center; align-items: center;
  padding: 34px 38px; text-align: center;
  background: #fffdf6; border: 1.5px solid var(--ink); border-radius: 6px;
  box-shadow: var(--card-shadow);
}
.face.back { transform: rotateY(180deg); background: var(--paper-2); }
.face .deck-tag { position: absolute; top: 12px; left: 14px; font-family: var(--font-mono); font-size: 11px; letter-spacing: .1em; color: var(--ink-faint); text-transform: uppercase; }
.face .txt { font-size: 20px; line-height: 1.5; white-space: pre-wrap; }
.face.back .txt { font-size: 18px; }
.fnav { display: flex; gap: 10px; justify-content: center; margin-top: 18px; flex-wrap: wrap; }
.btn.again { background: var(--red); border-color: var(--red); }
.btn.good { background: var(--green); border-color: var(--green); }

/* ---------- print (cheat sheets) ---------- */
@media print {
  .masthead, .no-print, .toc { display: none !important; }
  body { background: #fff; font-size: 11.5px; }
  .wrap { max-width: none; padding: 0; }
  .doc h2 { break-after: avoid; }
  .doc table { font-size: 10.5px; }
}

/* ---------- cross-device sync bar (additive — same tokens as .controls) ---------- */
input[type="email"] {
  font-family: var(--font-mono); font-size: 15px; padding: 7px 10px;
  border: 1.5px solid var(--ink); border-radius: 3px; background: var(--paper); color: var(--ink);
  min-width: 220px;
}
.syncbar { display: flex; gap: 12px; flex-wrap: wrap; align-items: center; margin-top: 14px; padding-top: 14px; border-top: 1px dashed var(--line); }
.sync-label {
  font-family: var(--font-display); font-size: 14px; letter-spacing: .1em; text-transform: uppercase;
  color: var(--ink-soft); display: flex; align-items: center; gap: 10px; flex-wrap: wrap;
}
.btn.small { font-size: 13px; padding: 7px 14px; }
#sync-status[data-state="err"] { color: var(--red); }
#sync-status[data-state="ok"] { color: var(--green); }

/* ---------- weak areas summary ---------- */
.weakgrid { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 10px; }
.weakgrid .wk {
  font-family: var(--font-mono); font-size: 12.5px;
  border: 1px solid var(--line); background: var(--paper-2); border-radius: 3px; padding: 4px 9px;
}
.weakgrid .wk b { font-family: var(--font-mono); color: var(--red); }

.loading { font-family: var(--font-mono); color: var(--ink-faint); padding: 40px 0; text-align: center; }
.footer-note { margin-top: 60px; border-top: 1px dashed var(--line); padding-top: 14px; font-family: var(--font-mono); font-size: 12px; color: var(--ink-faint); }
.footer-note a { color: var(--ink-soft); }

/* ==========================================================================
   FAR/AMT additions — visual guides (matrix, flow, compare, tree, slips)
   Same tokens as above; no new fonts, no external assets.
   ========================================================================== */

.hero h1 .lsr { color: var(--rust); }
.hero h1 .amt { color: var(--teal); }
.kicker { font-family: var(--font-mono); font-size: 12px; letter-spacing: .1em; text-transform: uppercase; color: var(--ink-faint); margin: 0 0 6px; }

/* tile grid on the dashboard */
.tiles { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 14px; margin: 14px 0 6px; }
.tile {
  display: block; text-decoration: none; color: var(--ink);
  background: #fffdf6; border: 1.5px solid var(--ink); border-radius: 4px;
  padding: 14px 16px 12px; box-shadow: var(--card-shadow); position: relative;
  transition: transform .08s ease;
}
.tile:hover { transform: translateY(-2px); }
.tile b { font-family: var(--font-display); font-weight: 600; font-size: 20px; letter-spacing: .06em; text-transform: uppercase; display: block; line-height: 1.1; }
.tile span { font-size: 14.5px; color: var(--ink-soft); display: block; margin-top: 4px; line-height: 1.4; }
.tile i { font-style: normal; font-family: var(--font-mono); font-size: 11px; color: var(--ink-faint); letter-spacing: .06em; position: absolute; top: 10px; right: 12px; }
.tile.lsr { border-top: 5px solid var(--rust); }
.tile.amt { border-top: 5px solid var(--teal); }
.panel .tile, .tile { background-image: none; }
.section-label { font-family: var(--font-display); font-weight: 600; font-size: 22px; letter-spacing: .1em; text-transform: uppercase; margin: 34px 0 4px; }

/* visual pages */
.vis h1 { font-family: var(--font-display); font-weight: 600; font-size: clamp(32px, 5vw, 46px); letter-spacing: .03em; text-transform: uppercase; line-height: 1.02; margin: 8px 0 6px; }
.vis h2 { font-family: var(--font-display); font-weight: 600; font-size: 26px; letter-spacing: .04em; text-transform: uppercase; margin: 36px 0 8px; padding-top: 12px; border-top: 2px solid var(--ink); scroll-margin-top: 84px; }
.vis h2::before { content: "§ "; color: var(--rust); font-weight: 400; }
.vis h3 { font-family: var(--font-display); font-weight: 600; font-size: 19px; letter-spacing: .04em; text-transform: uppercase; color: var(--ink-soft); margin: 22px 0 6px; }
.vis p.lede { font-size: 18px; color: var(--ink-soft); max-width: 760px; margin: 6px 0 14px; }
.vis p, .vis li { max-width: 820px; }
.vis code, .cite { font-family: var(--font-mono); font-size: 12px; color: var(--ink-soft); background: var(--paper-3); padding: 1px 5px; border-radius: 3px; white-space: nowrap; }
.vis a { text-decoration: none; background: linear-gradient(transparent 62%, rgba(176,73,42,.22) 62%); }
.vis a:hover { background: linear-gradient(transparent 55%, rgba(176,73,42,.38) 55%); }
.vis strong { background: linear-gradient(transparent 62%, rgba(176,73,42,.18) 62%); }
.note { border-left: 4px solid var(--amber); background: #fbf6e8; padding: 10px 14px; margin: 14px 0; font-size: 15.5px; max-width: 860px; }
.note.trap { border-left-color: var(--red); background: #f6ebe7; }
.note.ok { border-left-color: var(--green); background: #eef3ea; }
.jump { display: flex; flex-wrap: wrap; gap: 8px; margin: 10px 0 4px; }
.jump a { font-family: var(--font-display); font-size: 13px; letter-spacing: .08em; text-transform: uppercase; padding: 4px 11px; border: 1.5px solid var(--ink-soft); border-radius: 99px; background: none; color: var(--ink-soft); }
.jump a:hover { background: var(--ink); color: var(--paper); }

/* scrollable wide tables */
.scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; margin: 12px 0; border: 1.5px solid var(--ink); border-radius: 4px; background: #fffdf6; box-shadow: var(--card-shadow); }
.scroll table { margin: 0; }

/* who-may-do-what matrix */
table.matrix { border-collapse: collapse; width: 100%; min-width: 760px; font-size: 14px; }
.matrix th { font-family: var(--font-display); letter-spacing: .06em; text-transform: uppercase; font-size: 12.5px; font-weight: 600; text-align: center; background: var(--ink); color: var(--paper); padding: 8px 6px; vertical-align: bottom; line-height: 1.15; }
.matrix th:first-child { text-align: left; }
.matrix td { border: 1px solid var(--line); padding: 6px 6px; text-align: center; vertical-align: middle; line-height: 1.25; }
.matrix td:first-child { text-align: left; font-family: var(--font-display); font-size: 15px; letter-spacing: .03em; font-weight: 600; background: var(--paper-2); position: sticky; left: 0; z-index: 1; min-width: 150px; }
.matrix td:first-child small { display: block; font-family: var(--font-mono); font-weight: 400; font-size: 10.5px; color: var(--ink-faint); letter-spacing: 0; }
.mk { display: inline-block; min-width: 26px; font-family: var(--font-mono); font-weight: 600; font-size: 13px; padding: 2px 6px; border-radius: 3px; }
.mk.y { background: #dfeadb; color: var(--green); border: 1px solid #b9d0b1; }
.mk.n { color: #b7b2a4; }
.mk.c { background: #f6e9cc; color: #7d5713; border: 1px solid #e4cc93; }
.mk.na { color: #b7b2a4; font-weight: 400; font-size: 11px; }
.matrix sup { font-family: var(--font-mono); font-size: 10px; color: var(--ink-soft); margin-left: 1px; }
.matrix .sub { display: block; font-size: 11px; color: var(--ink-soft); font-family: var(--font-body); margin-top: 2px; }
.legend { display: flex; gap: 16px; flex-wrap: wrap; font-size: 14px; margin: 8px 0; align-items: center; }
.legend span { display: inline-flex; gap: 6px; align-items: center; }
ol.fn { font-size: 14.5px; padding-left: 24px; }
ol.fn li { margin: 4px 0; }
.certtabs { display: flex; gap: 6px; flex-wrap: wrap; margin: 16px 0 4px; }
.certtabs button { font-family: var(--font-display); font-size: 14px; letter-spacing: .08em; text-transform: uppercase; padding: 7px 14px; border: 1.5px solid var(--ink); background: transparent; color: var(--ink); border-radius: 3px; cursor: pointer; }
.certtabs button.on { background: var(--ink); color: var(--paper); }
.certpane[hidden] { display: none; }
.certpane .scope { font-size: 15px; color: var(--ink-soft); margin: 4px 0 8px; }

/* decision flow */
.flow { display: grid; gap: 0; margin: 16px 0; }
.q-node, .a-node {
  border: 1.5px solid var(--ink); border-radius: 4px; padding: 10px 14px; background: #fffdf6; box-shadow: var(--card-shadow);
}
.q-node { font-family: var(--font-display); font-weight: 600; font-size: 19px; letter-spacing: .04em; text-transform: uppercase; text-align: center; background: var(--ink); color: var(--paper); max-width: 640px; margin: 0 auto; }
.down { width: 2px; height: 22px; background: var(--ink); margin: 0 auto; position: relative; }
.down::after { content: ""; position: absolute; bottom: -2px; left: -5px; border: 6px solid transparent; border-top-color: var(--ink); border-bottom: 0; }
.branches { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 14px; }
.branch { display: flex; flex-direction: column; }
.branch .tag { font-family: var(--font-mono); font-size: 11.5px; letter-spacing: .06em; text-transform: uppercase; text-align: center; color: var(--ink-soft); margin-bottom: 4px; }
.a-node h4 { font-family: var(--font-display); font-weight: 600; font-size: 18px; letter-spacing: .05em; text-transform: uppercase; margin: 0 0 4px; }
.a-node p, .a-node li { font-size: 14.5px; margin: 4px 0; line-height: 1.45; }
.a-node ul { padding-left: 18px; margin: 4px 0; }
.a-node.lsr { border-top: 6px solid var(--rust); }
.a-node.amt { border-top: 6px solid var(--teal); }
.a-node.gray { border-top: 6px solid var(--ink-faint); }
.a-node .who { font-family: var(--font-mono); font-size: 12px; background: var(--paper-2); border-radius: 3px; padding: 5px 8px; margin-top: 6px; }

/* timeline bar (calendar-month & hours) */
.timeline { display: grid; grid-template-columns: repeat(13, 1fr); gap: 2px; margin: 10px 0 2px; max-width: 760px; }
.timeline div { font-family: var(--font-mono); font-size: 10.5px; text-align: center; padding: 6px 0; background: var(--paper-2); border: 1px solid var(--line); }
.timeline div.hit { background: var(--teal); color: var(--paper); border-color: var(--teal-deep); }
.timeline div.due { background: var(--rust); color: var(--paper); border-color: var(--rust-deep); }
.tl-cap { font-size: 13.5px; color: var(--ink-soft); max-width: 760px; }

/* before -> after compare */
table.cmp { border-collapse: collapse; width: 100%; min-width: 700px; font-size: 14.5px; }
.cmp th { font-family: var(--font-display); letter-spacing: .08em; text-transform: uppercase; font-size: 13px; text-align: left; background: var(--ink); color: var(--paper); padding: 8px 10px; }
.cmp td { border: 1px solid var(--line); padding: 8px 10px; vertical-align: top; line-height: 1.45; }
.cmp td:first-child { font-family: var(--font-display); font-weight: 600; font-size: 15.5px; letter-spacing: .03em; background: var(--paper-2); width: 18%; }
.cmp td.old { color: var(--ink-soft); background: #f7f2e6; }
.cmp td.new { background: #f1f5ee; }
.cmp td.new::before { content: "→ "; color: var(--teal); font-weight: 600; }
.cmp td.cite-col { font-family: var(--font-mono); font-size: 11.5px; color: var(--ink-soft); width: 15%; }
.cmp tr.same td.new::before { content: "= "; color: var(--ink-faint); }

/* spec bars (LSA envelope) */
.bars { display: grid; gap: 10px; max-width: 760px; margin: 12px 0; }
.bar-row { display: grid; grid-template-columns: 150px 1fr; gap: 10px; align-items: center; font-size: 14px; }
.bar-row .lbl { font-family: var(--font-display); font-weight: 600; letter-spacing: .04em; text-transform: uppercase; font-size: 14px; }
.bar-track { position: relative; height: 34px; background: var(--paper-2); border: 1px solid var(--line); border-radius: 3px; }
.bar-old, .bar-new { position: absolute; left: 0; height: 15px; border-radius: 2px; font-family: var(--font-mono); font-size: 11px; line-height: 15px; padding-left: 6px; white-space: nowrap; color: var(--paper); }
.bar-old { top: 1px; background: var(--ink-faint); }
.bar-new { top: 17px; background: var(--teal); }
.bars-key { font-size: 13px; color: var(--ink-soft); display: flex; gap: 14px; }
.bars-key i { display: inline-block; width: 14px; height: 10px; margin-right: 5px; vertical-align: middle; }

/* certificate tree */
.tree { margin: 14px 0; font-size: 15px; }
.tree ul { list-style: none; margin: 0; padding-left: 22px; position: relative; }
.tree > ul { padding-left: 0; }
.tree li { position: relative; padding: 4px 0 4px 18px; }
.tree ul ul li::before { content: ""; position: absolute; left: 0; top: 0; bottom: 0; border-left: 1.5px solid var(--ink-soft); }
.tree ul ul li:last-child::before { bottom: auto; height: 18px; }
.tree ul ul li::after { content: ""; position: absolute; left: 0; top: 18px; width: 14px; border-top: 1.5px solid var(--ink-soft); }
.tree .box { display: inline-block; border: 1.5px solid var(--ink); border-radius: 3px; padding: 3px 10px; background: #fffdf6; }
.tree .box.std { border-color: var(--teal); box-shadow: inset 4px 0 0 var(--teal); }
.tree .box.spc { border-color: var(--rust); box-shadow: inset 4px 0 0 var(--rust); }
.tree .box b { font-family: var(--font-display); letter-spacing: .05em; text-transform: uppercase; font-weight: 600; }
.tree small { color: var(--ink-soft); }

/* logbook slips */
.slips { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 16px; margin: 14px 0; }
.slip { background: #fffdf6; border: 1.5px solid var(--ink); border-radius: 4px; box-shadow: var(--card-shadow); padding: 14px 16px; position: relative; }
.slip h4 { font-family: var(--font-display); font-weight: 600; font-size: 19px; letter-spacing: .05em; text-transform: uppercase; margin: 0; }
.slip .src { font-family: var(--font-mono); font-size: 11.5px; color: var(--ink-faint); }
.slip ol, .slip ul { padding-left: 20px; font-size: 14.5px; margin: 8px 0; }
.slip li { margin: 3px 0; }
.slip.lsr { border-top: 6px solid var(--rust); }
.slip.amt { border-top: 6px solid var(--teal); }
.slip.gray { border-top: 6px solid var(--ink-faint); }
.entry { font-family: var(--font-mono); font-size: 12.5px; line-height: 1.6; background: var(--paper); border: 1px dashed var(--ink-soft); padding: 10px 12px; margin: 8px 0; white-space: pre-wrap; }

/* major / minor filter */
.filterbar { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; margin: 10px 0; }
input[type="search"] { font-family: var(--font-mono); font-size: 15px; padding: 8px 10px; border: 1.5px solid var(--ink); border-radius: 3px; background: #fffdf6; color: var(--ink); min-width: 260px; flex: 1; max-width: 420px; }
.listcols { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 14px; }
.listbox { background: #fffdf6; border: 1.5px solid var(--ink); border-radius: 4px; padding: 10px 14px; box-shadow: var(--card-shadow); }
.listbox h4 { font-family: var(--font-display); font-weight: 600; font-size: 16px; letter-spacing: .06em; text-transform: uppercase; margin: 0 0 4px; }
.listbox h4 small { font-family: var(--font-mono); font-size: 10.5px; color: var(--ink-faint); letter-spacing: 0; text-transform: none; }
.listbox ul { margin: 0; padding-left: 0; list-style: none; font-size: 14px; }
.listbox li { padding: 3px 0; border-bottom: 1px dotted var(--line); }
.listbox li:last-child { border-bottom: 0; }
.listbox li em { font-style: normal; font-family: var(--font-mono); font-size: 11px; color: var(--ink-faint); margin-right: 6px; }
.listbox.major { border-top: 6px solid var(--rust); }
.listbox.pm { border-top: 6px solid var(--green); }
.listbox li.hide { display: none; }
mark { background: #f3d9a4; padding: 0 1px; }

.steps { counter-reset: st; list-style: none; padding: 0; max-width: 860px; }
.steps > li { counter-increment: st; position: relative; padding: 10px 14px 10px 54px; margin: 10px 0; background: #fffdf6; border: 1.5px solid var(--ink); border-radius: 4px; }
.steps > li::before { content: counter(st); position: absolute; left: 12px; top: 10px; width: 30px; height: 30px; border-radius: 50%; background: var(--ink); color: var(--paper); font-family: var(--font-display); font-weight: 600; font-size: 18px; display: flex; align-items: center; justify-content: center; }
.steps > li b.h { font-family: var(--font-display); font-size: 17px; letter-spacing: .05em; text-transform: uppercase; display: block; }

@media (max-width: 640px) {
  .bar-row { grid-template-columns: 1fr; }
  .timeline div { font-size: 9px; }
  .q-node { font-size: 16px; }
  body { font-size: 16px; }
}
@media print {
  .scroll { overflow: visible; box-shadow: none; }
  table.matrix, table.cmp { min-width: 0; font-size: 10px; }
  .certpane[hidden] { display: block !important; }
  .certtabs, .filterbar, .jump { display: none !important; }
  .tile, .slip, .a-node, .listbox { box-shadow: none; }
}
.tablewrap { overflow-x: auto; -webkit-overflow-scrolling: touch; }
.tablewrap table { min-width: 520px; }
.guidestrip { display: flex; flex-wrap: wrap; gap: 6px; margin: 0 0 18px; }
.guidestrip a { font-family: var(--font-display); font-size: 13px; letter-spacing: .08em; text-transform: uppercase; padding: 4px 11px; border: 1.5px solid var(--ink-soft); border-radius: 99px; color: var(--ink-soft); text-decoration: none; background: none; }
.guidestrip a.on, .guidestrip a:hover { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.sitefoot { max-width: 1040px; margin: 0 auto; padding: 0 20px 40px; }
.sitefoot .footer-note { margin-top: 30px; }
.face .cardref { position: absolute; bottom: 12px; left: 14px; right: 14px; font-family: var(--font-mono); font-size: 11.5px; color: var(--ink-faint); text-align: center; }
.fcard { min-height: 340px; }
.face.back .txt { padding-bottom: 18px; }
.face { overflow-y: auto; }

/* ==========================================================================
   2026-10-05b restructure — five sections, mobile tab bar, hubs, Ask chat
   ========================================================================== */
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
html { -webkit-text-size-adjust: 100%; }
body { overflow-wrap: break-word; }
img, svg { max-width: 100%; }

/* bottom tab bar (phones/tablets) */
.tabbar {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 60;
  display: grid; grid-template-columns: repeat(5, 1fr);
  background: var(--paper); border-top: 3px double var(--ink);
  box-shadow: 0 -2px 12px -6px rgba(34,38,46,.25);
  padding: 0 env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left);
}
.tabbar a {
  min-height: 56px; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 2px;
  text-decoration: none; color: var(--ink-soft);
  font-family: var(--font-display); font-weight: 600; font-size: 13px; letter-spacing: .1em; text-transform: uppercase;
  -webkit-tap-highlight-color: transparent; border-top: 3px solid transparent; margin-top: -1px;
}
.tabbar svg { width: 24px; height: 24px; fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; }
.tabbar a.on { color: var(--rust); border-top-color: var(--rust); background: var(--paper-2); }
.tabbar a:active { background: var(--paper-3); }
body.has-tabbar { padding-bottom: calc(60px + env(safe-area-inset-bottom)); }

@media (max-width: 899.98px) {
  .masthead { position: static; }
  .masthead .nav { display: none; }
  .masthead-inner { padding: 10px max(16px, env(safe-area-inset-left)); }
  .brand { font-size: 19px; letter-spacing: .1em; flex-wrap: wrap; row-gap: 0; }
  .brand small { flex-basis: 100%; display: none; }
  body { font-size: 18px; line-height: 1.6; }
  .wrap { padding: 18px 16px 40px; }
  .vis p.lede, .hero p.lede { font-size: 18px; }
  /* tap targets */
  .btn { min-height: 44px; display: inline-flex; align-items: center; justify-content: center; }
  .chip, .jump a, .guidestrip a, .certtabs button { min-height: 44px; display: inline-flex; align-items: center; }
  select, input[type="number"], input[type="search"] { min-height: 44px; font-size: 16px; }
  .choice { min-height: 48px; font-size: 17px; }
  .toc a { padding-top: 9px; padding-bottom: 9px; }
  /* one-row swipeable pill strips instead of three wrapped rows */
  .guidestrip { flex-wrap: nowrap; overflow-x: auto; -webkit-overflow-scrolling: touch; scrollbar-width: none; margin-left: -16px; margin-right: -16px; padding: 2px 16px 6px; }
  .guidestrip::-webkit-scrollbar { display: none; }
  .guidestrip a { flex: none; }
  .doc h1 { font-size: 32px; }
  .doc h2 { font-size: 24px; }
  .panel { padding: 18px 16px; }
  .testcard { padding: 18px 18px 18px 22px; }
  input[type="search"] { min-width: 0; width: 100%; max-width: none; }
  .sitefoot { padding-left: 16px; padding-right: 16px; }
}
@media (min-width: 900px) {
  .tabbar { display: none; }
  body.has-tabbar { padding-bottom: 0; }
  .nav a { padding: 8px 14px; }
}

/* wide tables: horizontal scroll with a sticky first column everywhere */
.scroll { max-width: 100%; overscroll-behavior-x: contain; }
.scroll .cmp th:first-child, .scroll .cmp td:first-child,
.scroll .matrix th:first-child { position: sticky; left: 0; z-index: 2; }
.scroll .cmp td:first-child { box-shadow: 1px 0 0 var(--line), 4px 0 6px -4px rgba(34,38,46,.25); }
.scroll .matrix td:first-child { box-shadow: 1px 0 0 var(--line), 4px 0 6px -4px rgba(34,38,46,.25); }
.scroll .cmp th:first-child, .scroll .matrix th:first-child { background: var(--ink); }
@media (max-width: 640px) {
  table.matrix { min-width: 640px; font-size: 13px; }
  .matrix td:first-child { min-width: 112px; max-width: 128px; font-size: 14px; }
  table.cmp { min-width: 560px; font-size: 14px; }
  .scroll .cmp td:first-child { min-width: 104px; max-width: 132px; font-size: 14px; }
}

/* home */
.hero-short { margin: 8px 0 18px; }
.hero-short h1 { font-size: clamp(30px, 6.4vw, 54px); line-height: 1; }
.hero-short .lede { font-size: 17px !important; margin-top: 10px !important; }
.askbox {
  background: #fffdf6; border: 1.5px solid var(--ink); border-radius: 6px; box-shadow: var(--card-shadow);
  padding: 16px; margin: 0 0 18px; border-top: 6px solid var(--rust);
}
.askbox label { font-family: var(--font-display); font-weight: 600; font-size: 22px; letter-spacing: .08em; text-transform: uppercase; display: block; margin-bottom: 8px; }
.askbox-row { display: flex; gap: 10px; align-items: stretch; }
.askbox textarea, .composer textarea {
  flex: 1; min-width: 0; font-family: var(--font-body); font-size: 17px; line-height: 1.4;
  border: 1.5px solid var(--ink); border-radius: 4px; background: var(--paper); color: var(--ink);
  padding: 10px 12px; resize: none; min-height: 48px;
}
.askbox textarea:focus, .composer textarea:focus { outline: 2px solid var(--rust); outline-offset: 1px; }
.askbox .btn { min-width: 76px; min-height: 48px; }
.askbox-hint { font-family: var(--font-mono); font-size: 12px; color: var(--ink-faint); margin: 8px 0 0; }
.hometiles { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
@media (min-width: 900px) { .hometiles { grid-template-columns: repeat(4, minmax(0, 1fr)); } }
.hometiles .tile { min-height: 110px; padding: 14px; }
.hometiles .tile span { font-size: 14px; }
.home-more { margin-top: 14px; }
.home-more a { text-decoration: none; background: linear-gradient(transparent 62%, rgba(176,73,42,.22) 62%); }

/* hubs (Learn / Visual) */
.hubhead h1 { font-family: var(--font-display); font-weight: 600; font-size: clamp(32px, 6vw, 46px); letter-spacing: .03em; text-transform: uppercase; line-height: 1.02; margin: 4px 0 6px; }
.hubhead .lede { font-size: 17px; color: var(--ink-soft); max-width: 720px; margin: 6px 0 4px; }
.hubhead em { font-style: normal; font-weight: 600; }
.hubcards { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 300px), 1fr)); gap: 12px; margin: 12px 0 8px; }
.hubcard {
  display: block; text-decoration: none; color: var(--ink); background: #fffdf6;
  border: 1.5px solid var(--ink); border-radius: 6px; box-shadow: var(--card-shadow);
  padding: 16px 44px 16px 18px; min-height: 76px; position: relative;
}
.hubcard::after { content: "›"; position: absolute; right: 16px; top: 50%; transform: translateY(-50%); font-family: var(--font-display); font-size: 34px; color: var(--ink-faint); }
.hubcard:hover { transform: translateY(-1px); }
.hubcard b { font-family: var(--font-display); font-weight: 600; font-size: 22px; letter-spacing: .05em; text-transform: uppercase; display: block; line-height: 1.1; }
.hubcard span { display: block; font-size: 15px; color: var(--ink-soft); margin-top: 4px; line-height: 1.4; }
.hubcard i { font-style: normal; font-family: var(--font-mono); font-size: 11px; color: var(--ink-faint); position: absolute; top: 10px; right: 16px; }
.hubcard.lsr { border-left: 7px solid var(--rust); }
.hubcard.amt { border-left: 7px solid var(--teal); }
@media (max-width: 420px) { .facts { grid-template-columns: repeat(3, minmax(0, 1fr)); } .fact b { font-size: 18px; } .fact span { font-size: 11px; } }

/* "Ask about this page" */
.askthis { margin: -6px 0 14px; }
.askthis a {
  display: inline-flex; align-items: center; gap: 8px; min-height: 44px; padding: 0 2px;
  font-family: var(--font-display); font-weight: 600; font-size: 15px; letter-spacing: .1em; text-transform: uppercase;
  color: var(--rust); text-decoration: none; background: none !important;
}
.askthis a span { display: inline-flex; width: 24px; height: 24px; border-radius: 50%; align-items: center; justify-content: center; background: var(--rust); color: var(--paper); font-size: 15px; }
.askthis a:hover { text-decoration: underline; }

/* Ask page */
.askmain { padding-bottom: 0; display: flex; flex-direction: column; min-height: calc(100vh - 140px); min-height: calc(100dvh - 140px); }
.askhead { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.askhead h1 { font-family: var(--font-display); font-weight: 600; font-size: 34px; letter-spacing: .06em; text-transform: uppercase; margin: 0; }
.chatlog { flex: 1; display: flex; flex-direction: column; gap: 12px; padding: 14px 0 10px; }
.chat-intro p { font-size: 17px; color: var(--ink-soft); margin: 0 0 12px; }
.chat-intro[hidden] { display: none; }
.starters { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 260px), 1fr)); gap: 8px; }
.starter {
  text-align: left; font-family: var(--font-body); font-size: 16px; line-height: 1.35; color: var(--ink);
  background: #fffdf6; border: 1.5px solid var(--ink-soft); border-radius: 18px; padding: 10px 14px; min-height: 48px; cursor: pointer;
}
.starter:hover { border-color: var(--ink); background: var(--paper-2); }
.msg { max-width: 92%; border-radius: 14px; padding: 10px 14px; font-size: 17px; line-height: 1.55; }
.msg p { margin: 6px 0; }
.msg p:first-child { margin-top: 0; }
.msg p:last-child { margin-bottom: 0; }
.msg ul, .msg ol { margin: 6px 0; padding-left: 22px; }
.msg li { margin: 3px 0; }
.msg .rh { font-family: var(--font-display); font-weight: 600; letter-spacing: .05em; text-transform: uppercase; }
.msg.user { align-self: flex-end; background: var(--ink); color: var(--paper); border-bottom-right-radius: 4px; white-space: pre-wrap; }
.msg.bot { align-self: flex-start; background: #fffdf6; border: 1.5px solid var(--line); border-bottom-left-radius: 4px; box-shadow: var(--card-shadow); }
.msg.bot.err { background: #f6ebe7; border-color: #e3c3b9; color: var(--red); }
.cite-chip {
  display: inline-block; font-family: var(--font-mono); font-size: 12.5px; line-height: 1.3; color: var(--teal-deep);
  background: #e4eeec; border: 1px solid #bcd4d0; border-radius: 4px; padding: 0 5px; margin: 0 1px; white-space: nowrap;
}
.msg.typing { display: inline-flex; gap: 5px; align-items: center; padding: 14px 16px; }
.msg.typing span { width: 8px; height: 8px; border-radius: 50%; background: var(--ink-faint); animation: dot 1.2s infinite ease-in-out; }
.msg.typing span:nth-child(2) { animation-delay: .15s; }
.msg.typing span:nth-child(3) { animation-delay: .3s; }
@keyframes dot { 0%, 80%, 100% { opacity: .3; transform: translateY(0); } 40% { opacity: 1; transform: translateY(-4px); } }
.composer {
  position: sticky; bottom: 0; z-index: 40; background: var(--paper);
  padding: 10px 0 6px; border-top: 1px solid var(--line);
}
.composer-row { display: flex; gap: 8px; align-items: flex-end; }
.composer textarea { max-height: 180px; overflow-y: auto; }
.composer .send { min-width: 74px; min-height: 48px; }
.composer-note { font-family: var(--font-mono); font-size: 11.5px; color: var(--ink-faint); margin: 6px 0 0; text-align: center; }
@media (max-width: 899.98px) {
  .composer { bottom: calc(60px + env(safe-area-inset-bottom)); margin: 0 -16px; padding: 10px 16px 6px; }
  /* while typing on a phone, give the keyboard the tab bar's space */
  body.typing-focus .tabbar, body.kb-open .tabbar { display: none; }
  body.typing-focus .composer, body.kb-open .composer { bottom: 0; }
  .askhead h1 { font-size: 28px; }
}
@media print { .tabbar, .askthis, .composer { display: none !important; } }
.swipe-hint { font-family: var(--font-mono); font-size: 12px; color: var(--ink-faint); margin: 10px 0 -6px; }
@media (min-width: 900px) { .swipe-hint { display: none; } }
.toc-toggle { display: none; }
@media (max-width: 899.98px) {
  .toc { border-right: 0; padding-right: 0; border: 1.5px solid var(--ink); border-radius: 4px; background: #fffdf6; }
  .toc-toggle {
    display: flex; width: 100%; min-height: 48px; align-items: center; justify-content: space-between;
    font-family: var(--font-display); font-weight: 600; font-size: 16px; letter-spacing: .1em; text-transform: uppercase;
    background: none; border: 0; color: var(--ink); padding: 0 14px; cursor: pointer;
  }
  .toc-toggle::after { content: "▾"; font-size: 18px; transition: transform .15s ease; }
  .toc.open .toc-toggle::after { transform: rotate(180deg); }
  .toc > a { display: none; }
  .toc.open > a { display: block; padding-left: 14px; }
  .toc.open > a.h3 { padding-left: 28px; }
  .toc.open { padding-bottom: 8px; }
}

/* Ask: library page images attached to answers */
.msg .fig { margin: .75rem 0 0; }
.msg .fig img { display: block; width: 100%; max-width: 560px; height: auto; border: 1px solid var(--rule, #d8cfbd); border-radius: 6px; background: #fff; }
.msg .fig figcaption { font-family: "IBM Plex Mono", monospace; font-size: .75rem; opacity: .75; margin-top: .3rem; }