/* ============================================================
   FRM Ledger — "risk ledger" editorial design system
   Cream paper, ink type, oxblood accent. Fraunces / Archivo /
   Spline Sans Mono.
   ============================================================ */

:root {
  --paper: #f5f0e6;
  --paper-deep: #ede6d6;
  --card: #faf6ee;
  --ink: #211b14;
  --ink-soft: #5c5246;
  --ink-faint: #8a7e6e;
  --rule: #d4c9b4;
  --rule-strong: #a89878;
  --oxblood: #8c2f1b;
  --oxblood-deep: #6e2413;
  --green: #2e5e41;
  --green-soft: #e2ead9;
  --red-soft: #f0ddd5;
  --gold: #b08c3e;
  --serif: "Fraunces", Georgia, serif;
  --sans: "Archivo", "Segoe UI", sans-serif;
  --mono: "Spline Sans Mono", Consolas, monospace;
  --shadow: 0 1px 2px rgba(33, 27, 20, .08), 0 8px 24px -12px rgba(33, 27, 20, .25);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.55;
  color: var(--ink);
  background:
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2'/%3E%3C/filter%3E%3Crect width='180' height='180' filter='url(%23n)' opacity='0.035'/%3E%3C/svg%3E"),
    var(--paper);
}

/* ---------- frame ---------- */

.frame { display: grid; grid-template-columns: 232px 1fr; min-height: 100vh; }

.sidebar {
  border-right: 1px solid var(--rule-strong);
  padding: 28px 22px;
  display: flex;
  flex-direction: column;
  gap: 28px;
  position: sticky;
  top: 0;
  height: 100vh;
}

.brand { text-decoration: none; color: var(--ink); display: block; }
.brand-mark {
  font-family: var(--serif);
  font-weight: 900;
  font-size: 2.4rem;
  letter-spacing: -.02em;
  display: block;
  line-height: 1;
}
.brand-mark::after { content: "."; color: var(--oxblood); }
.brand-sub {
  font-family: var(--mono);
  font-size: .72rem;
  text-transform: uppercase;
  letter-spacing: .18em;
  color: var(--ink-soft);
}

.nav { display: flex; flex-direction: column; }
.nav a {
  font-family: var(--sans);
  font-weight: 600;
  font-size: .92rem;
  color: var(--ink-soft);
  text-decoration: none;
  padding: 9px 2px;
  border-bottom: 1px solid var(--rule);
  display: flex;
  justify-content: space-between;
  transition: color .15s, padding-left .15s;
}
.nav a:hover { color: var(--oxblood); padding-left: 6px; }
.nav a.active { color: var(--ink); }
.nav a.active::after { content: "●"; color: var(--oxblood); font-size: .6rem; align-self: center; }

.sidebar-foot { margin-top: auto; display: flex; flex-direction: column; gap: 14px; }
.countdown { font-family: var(--mono); font-size: .8rem; color: var(--ink-soft); }
.countdown strong { color: var(--oxblood); font-size: 1.3rem; display: block; font-weight: 600; }
.foot-note { font-size: .7rem; color: var(--ink-faint); line-height: 1.5; }

.main { padding: 40px 48px 80px; max-width: 1060px; width: 100%; }

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

h1, h2, h3 { font-family: var(--serif); line-height: 1.15; }
h1 { font-size: 2.6rem; font-weight: 900; letter-spacing: -.015em; margin: 0 0 6px; }
h2 { font-size: 1.5rem; font-weight: 700; margin: 1.6em 0 .5em; }
.kicker {
  font-family: var(--mono);
  font-size: .72rem;
  text-transform: uppercase;
  letter-spacing: .22em;
  color: var(--oxblood);
  margin-bottom: 10px;
}
.lede { color: var(--ink-soft); max-width: 56ch; margin: 0 0 28px; }
.mono { font-family: var(--mono); }

/* ---------- common components ---------- */

.rule-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  border-bottom: 2px solid var(--ink);
  padding-bottom: 6px;
  margin: 36px 0 16px;
}
.rule-head h2 { margin: 0; }
.rule-head .mono { font-size: .75rem; color: var(--ink-faint); }

.card {
  background: var(--card);
  border: 1px solid var(--rule);
  border-radius: 3px;
  padding: 20px 22px;
  box-shadow: var(--shadow);
}

.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }

.btn {
  font-family: var(--sans);
  font-weight: 700;
  font-size: .95rem;
  border: 1.5px solid var(--ink);
  background: var(--ink);
  color: var(--paper);
  padding: 11px 22px;
  border-radius: 3px;
  cursor: pointer;
  transition: transform .12s, background .15s, box-shadow .12s;
}
.btn:hover { background: var(--oxblood-deep); border-color: var(--oxblood-deep); transform: translateY(-1px); box-shadow: var(--shadow); }
.btn:active { transform: translateY(0); }
.btn.secondary { background: transparent; color: var(--ink); }
.btn.secondary:hover { background: var(--paper-deep); color: var(--ink); }
.btn.accent { background: var(--oxblood); border-color: var(--oxblood); }
.btn.accent:hover { background: var(--oxblood-deep); }
.btn:disabled { opacity: .45; cursor: not-allowed; transform: none; }
.btn.small { padding: 6px 14px; font-size: .82rem; }

a { color: var(--oxblood); }

.stat {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.stat .num { font-family: var(--mono); font-size: 2rem; font-weight: 600; line-height: 1.1; }
.stat .label { font-family: var(--mono); font-size: .7rem; text-transform: uppercase; letter-spacing: .14em; color: var(--ink-faint); }

.badge {
  display: inline-block;
  font-family: var(--mono);
  font-size: .68rem;
  text-transform: uppercase;
  letter-spacing: .1em;
  padding: 2px 8px;
  border: 1px solid var(--rule-strong);
  border-radius: 2px;
  color: var(--ink-soft);
  background: var(--paper-deep);
}
.badge.ox { color: var(--oxblood); border-color: var(--oxblood); background: var(--red-soft); }
.badge.green { color: var(--green); border-color: var(--green); background: var(--green-soft); }

/* mastery bars */
.bar-row { display: grid; grid-template-columns: 1fr 90px; gap: 12px; align-items: center; padding: 10px 0; border-bottom: 1px solid var(--rule); }
.bar-row:last-child { border-bottom: 0; }
.bar-label { font-weight: 600; font-size: .9rem; }
.bar-label small { display: block; font-weight: 400; font-family: var(--mono); font-size: .7rem; color: var(--ink-faint); }
.bar-track { grid-column: 1 / -1; height: 8px; background: var(--paper-deep); border: 1px solid var(--rule); border-radius: 2px; overflow: hidden; position: relative; }
.bar-fill { height: 100%; background: var(--green); transition: width .6s cubic-bezier(.2,.8,.2,1); }
.bar-fill.low { background: var(--oxblood); }
.bar-fill.mid { background: var(--gold); }
.bar-pct { font-family: var(--mono); font-size: .85rem; text-align: right; }

/* tables */
table.ledger { width: 100%; border-collapse: collapse; font-size: .9rem; }
table.ledger th {
  font-family: var(--mono); font-size: .68rem; text-transform: uppercase;
  letter-spacing: .12em; color: var(--ink-faint); text-align: left;
  border-bottom: 2px solid var(--ink); padding: 6px 10px 6px 0;
}
table.ledger td { padding: 9px 10px 9px 0; border-bottom: 1px solid var(--rule); vertical-align: top; }
table.ledger .num { font-family: var(--mono); }

/* ---------- quiz ---------- */

.quiz-shell { max-width: 760px; }
.quiz-meta {
  display: flex; justify-content: space-between; align-items: center;
  font-family: var(--mono); font-size: .78rem; color: var(--ink-soft);
  border-bottom: 1px solid var(--rule-strong); padding-bottom: 10px; margin-bottom: 26px;
}
.quiz-progress { display: flex; gap: 4px; }
.tick { width: 14px; height: 6px; background: var(--paper-deep); border: 1px solid var(--rule); border-radius: 1px; }
.tick.done-right { background: var(--green); border-color: var(--green); }
.tick.done-wrong { background: var(--oxblood); border-color: var(--oxblood); }
.tick.current { border-color: var(--ink); background: var(--card); }

.q-stem {
  font-family: var(--serif);
  font-size: 1.32rem;
  font-weight: 600;
  line-height: 1.45;
  margin: 0 0 24px;
  animation: rise .35s cubic-bezier(.2,.8,.2,1);
}

@keyframes rise { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }

.opts { display: flex; flex-direction: column; gap: 10px; }
.opt {
  display: flex; gap: 14px; align-items: baseline;
  text-align: left; width: 100%;
  font-family: var(--sans); font-size: 1rem; line-height: 1.5; color: var(--ink);
  background: var(--card); border: 1px solid var(--rule); border-radius: 3px;
  padding: 13px 16px; cursor: pointer;
  transition: border-color .12s, background .12s, transform .12s;
  animation: rise .35s cubic-bezier(.2,.8,.2,1) backwards;
}
.opt:nth-child(2) { animation-delay: .04s; }
.opt:nth-child(3) { animation-delay: .08s; }
.opt:nth-child(4) { animation-delay: .12s; }
.opt:hover:not(:disabled) { border-color: var(--ink); transform: translateX(3px); }
.opt:disabled { cursor: default; }
.opt .key {
  font-family: var(--mono); font-weight: 600; font-size: .85rem;
  color: var(--ink-faint); flex: 0 0 18px;
}
.opt.right { background: var(--green-soft); border-color: var(--green); }
.opt.right .key { color: var(--green); }
.opt.wrong { background: var(--red-soft); border-color: var(--oxblood); }
.opt.wrong .key { color: var(--oxblood); }
.opt.dim { opacity: .55; }

.verdict {
  margin-top: 22px;
  border-left: 3px solid var(--ink);
  padding: 14px 18px;
  background: var(--card);
  animation: rise .3s cubic-bezier(.2,.8,.2,1);
}
.verdict.right { border-color: var(--green); }
.verdict.wrong { border-color: var(--oxblood); }
.verdict h3 { margin: 0 0 6px; font-size: 1.05rem; }
.verdict p { margin: 0 0 8px; font-size: .95rem; color: var(--ink-soft); }
.remediate {
  display: inline-block; margin-top: 6px;
  font-weight: 600; font-size: .88rem;
}

.quiz-foot { margin-top: 26px; display: flex; justify-content: space-between; align-items: center; }

.timer { font-family: var(--mono); font-size: 1rem; font-weight: 600; }
.timer.low { color: var(--oxblood); animation: blink 1s steps(2) infinite; }
@keyframes blink { 50% { opacity: .4; } }

/* results */
.score-hero {
  font-family: var(--serif); font-weight: 900; font-size: 4.2rem; line-height: 1;
  margin: 10px 0 4px;
}
.score-hero small { font-size: 1.6rem; color: var(--ink-faint); font-weight: 600; }

/* ---------- modules ---------- */

.book-section { margin-bottom: 8px; }
.module-row {
  display: grid; grid-template-columns: 44px 1fr auto; gap: 14px; align-items: center;
  padding: 11px 4px; border-bottom: 1px solid var(--rule);
  text-decoration: none; color: var(--ink);
  transition: background .12s, padding-left .12s;
}
.module-row:hover { background: var(--card); padding-left: 10px; }
.module-row .rnum { font-family: var(--mono); color: var(--ink-faint); font-size: .8rem; }
.module-row .mtitle { font-weight: 600; font-size: .95rem; }
.module-row .mmeta { font-family: var(--mono); font-size: .72rem; color: var(--ink-faint); text-align: right; }

.module-body { max-width: 760px; }
.module-body h1 { font-size: 2rem; }
.module-body h2 { font-size: 1.3rem; border-bottom: 1px solid var(--rule-strong); padding-bottom: 4px; }
.module-body h3 { font-size: 1.05rem; }
.module-body table { width: 100%; border-collapse: collapse; font-size: .88rem; margin: 14px 0; }
.module-body th { font-family: var(--mono); font-size: .7rem; text-transform: uppercase; letter-spacing: .1em; text-align: left; border-bottom: 2px solid var(--ink); padding: 6px 10px 6px 0; }
.module-body td { padding: 7px 10px 7px 0; border-bottom: 1px solid var(--rule); }
.module-body code { font-family: var(--mono); font-size: .85em; background: var(--paper-deep); padding: 1px 5px; border-radius: 2px; }
.module-body pre { background: var(--ink); color: var(--paper); padding: 14px 16px; border-radius: 3px; overflow-x: auto; font-size: .85rem; }
.module-body pre code { background: none; color: inherit; padding: 0; }
.module-body blockquote { margin: 14px 0; padding: 10px 18px; border-left: 3px solid var(--gold); background: var(--card); color: var(--ink-soft); }
.module-body blockquote p { margin: 4px 0; }
.module-body ul li { margin: 3px 0; }

/* ---------- reference ---------- */

.tabs { display: flex; gap: 0; border-bottom: 2px solid var(--ink); margin-bottom: 20px; }
.tab {
  font-family: var(--sans); font-weight: 700; font-size: .9rem;
  background: none; border: none; cursor: pointer; color: var(--ink-faint);
  padding: 10px 18px; border-bottom: 3px solid transparent; margin-bottom: -2px;
}
.tab.active { color: var(--ink); border-color: var(--oxblood); }

.filter-box {
  width: 100%; max-width: 380px;
  font-family: var(--mono); font-size: .9rem;
  padding: 9px 12px; margin-bottom: 16px;
  border: 1px solid var(--rule-strong); border-radius: 3px;
  background: var(--card); color: var(--ink);
}
.filter-box:focus { outline: 2px solid var(--oxblood); outline-offset: 1px; }

/* ---------- settings / forms ---------- */

.form-row { display: grid; grid-template-columns: 220px 1fr; gap: 16px; align-items: center; padding: 14px 0; border-bottom: 1px solid var(--rule); }
.form-row label { font-weight: 600; font-size: .92rem; }
.form-row label small { display: block; font-weight: 400; color: var(--ink-faint); font-size: .76rem; }
.form-row input, .form-row select {
  font-family: var(--mono); font-size: .9rem; padding: 8px 10px;
  border: 1px solid var(--rule-strong); border-radius: 3px;
  background: var(--card); color: var(--ink); max-width: 240px;
}

.choice-row { display: flex; gap: 10px; flex-wrap: wrap; }
.chip {
  font-family: var(--sans); font-weight: 600; font-size: .85rem;
  padding: 8px 16px; border: 1.5px solid var(--rule-strong); border-radius: 20px;
  background: var(--card); color: var(--ink-soft); cursor: pointer;
  transition: all .12s;
}
.chip:hover { border-color: var(--ink); color: var(--ink); }
.chip.on { background: var(--ink); border-color: var(--ink); color: var(--paper); }

.provenance {
  border: 1px solid var(--rule-strong);
  border-left: 3px solid var(--gold);
  background: var(--card);
  padding: 12px 16px;
  margin: 18px 0 4px;
  font-size: .85rem;
  color: var(--ink-soft);
  border-radius: 3px;
}
.provenance strong { color: var(--ink); }

.verdict-foot { display: flex; align-items: center; gap: 14px; margin-top: 12px; }
.flag-btn {
  font-family: var(--sans); font-weight: 600; font-size: .78rem;
  background: none; border: 1px solid var(--rule-strong); border-radius: 2px;
  color: var(--ink-faint); padding: 4px 10px; cursor: pointer;
  transition: all .12s;
}
.flag-btn:hover { color: var(--oxblood); border-color: var(--oxblood); }
.flag-btn.on { color: var(--oxblood); border-color: var(--oxblood); background: var(--red-soft); }
.lo-tag { font-size: .72rem; color: var(--ink-faint); }

.loading { font-family: var(--mono); color: var(--ink-faint); padding: 60px 0; }

.empty { color: var(--ink-faint); font-style: italic; padding: 18px 0; }

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

@media (max-width: 860px) {
  .frame { grid-template-columns: 1fr; }
  .sidebar {
    position: static; height: auto; flex-direction: row; align-items: center;
    gap: 16px; padding: 14px 18px; border-right: 0; border-bottom: 1px solid var(--rule-strong);
    flex-wrap: wrap;
  }
  .brand-mark { font-size: 1.5rem; display: inline; }
  .brand-sub { display: none; }
  .nav { flex-direction: row; flex-wrap: wrap; gap: 2px 14px; }
  .nav a { border-bottom: 0; padding: 4px 0; font-size: .85rem; }
  .nav a.active::after { content: ""; }
  .sidebar-foot { display: none; }
  .main { padding: 24px 18px 60px; }
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
  h1 { font-size: 1.9rem; }
  .form-row { grid-template-columns: 1fr; gap: 6px; }
}