:root {
  color-scheme: light;
  --page: #f9f9f7;
  --surface: #fcfcfb;
  --raised: #ffffff;
  --ink: #0b0b0b;
  --ink-2: #52514e;
  --muted: #898781;
  --grid: #e1e0d9;
  --axis: #c3c2b7;
  --border: rgba(11, 11, 11, 0.10);
  --accent: #2a78d6;
  --accent-wash: rgba(42, 120, 214, 0.10);
  --pos: #006300;
  --neg: #c03030;
  --ok-wash: rgba(12, 163, 12, 0.10);
  --ko-wash: rgba(208, 59, 59, 0.10);
  --s1: #2a78d6;
  --s2: #eb6834;
  --s3: #1baf7a;
  --radius: 10px;
  --nav-w: 270px;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --page: #0d0d0d;
    --surface: #1a1a19;
    --raised: #222220;
    --ink: #f0efec;
    --ink-2: #c3c2b7;
    --grid: #2c2c2a;
    --axis: #383835;
    --border: rgba(255, 255, 255, 0.10);
    --accent: #3987e5;
    --accent-wash: rgba(57, 135, 229, 0.16);
    --pos: #0ca30c;
    --neg: #e66767;
    --s1: #3987e5;
    --s2: #d95926;
    --s3: #199e70;
  }
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --page: #0d0d0d; --surface: #1a1a19; --raised: #222220; --ink: #f0efec; --ink-2: #c3c2b7;
  --grid: #2c2c2a; --axis: #383835; --border: rgba(255, 255, 255, 0.10); --accent: #3987e5;
  --accent-wash: rgba(57, 135, 229, 0.16); --pos: #0ca30c; --neg: #e66767;
  --s1: #3987e5; --s2: #d95926; --s3: #199e70;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--page); color: var(--ink);
  font: 16px/1.6 system-ui, -apple-system, "Segoe UI", sans-serif;
}
a { color: var(--accent); }
h1 { font-size: 2rem; line-height: 1.2; margin: 0 0 .4em; letter-spacing: -0.01em; }
h2 { font-size: 1.35rem; margin: 2em 0 .5em; }
h3 { font-size: 1.05rem; margin: 1.5em 0 .4em; }
.lead { font-size: 1.15rem; color: var(--ink-2); margin-top: 0; }
.kicker { text-transform: uppercase; letter-spacing: .08em; font-size: .75rem; color: var(--muted); margin: 0 0 .3em; font-weight: 600; }
.muted { color: var(--muted); }
.small { font-size: .875rem; }
blockquote { margin: 1em 0; padding: .6em 1em; border-left: 3px solid var(--accent); background: var(--accent-wash); border-radius: 0 var(--radius) var(--radius) 0; }
.callout { padding: .9em 1.1em; background: var(--surface); border: 1px solid var(--border); border-left: 3px solid var(--accent); border-radius: var(--radius); margin: 1em 0; }

/* Mise en page */
.topbar { display: none; }
#nav {
  position: fixed; inset: 0 auto 0 0; width: var(--nav-w); overflow-y: auto;
  background: var(--surface); border-right: 1px solid var(--border); padding: 20px 12px;
}
#nav a { display: block; padding: 8px 10px; border-radius: 8px; color: var(--ink); text-decoration: none; margin-bottom: 2px; }
#nav a:hover { background: var(--accent-wash); }
#nav a.active { background: var(--accent-wash); font-weight: 600; }
#nav a.disabled { color: var(--muted); pointer-events: none; }
#nav small { display: block; font-size: .78rem; color: var(--muted); font-weight: 400; }
.nav-group { text-transform: uppercase; letter-spacing: .08em; font-size: .7rem; color: var(--muted); font-weight: 600; margin: 18px 10px 6px; }
.bar { height: 3px; background: var(--grid); border-radius: 2px; margin-top: 5px; overflow: hidden; }
.bar i { display: block; height: 100%; background: var(--s3); }
main { margin-left: var(--nav-w); max-width: calc(820px + 80px); padding: 48px 40px 96px; }

/* Tableaux */
.tbl { border-collapse: collapse; width: 100%; margin: 1em 0; font-size: .95rem; }
.tbl th, .tbl td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--grid); }
.tbl th { font-weight: 600; }

/* Boutons */
.btn {
  display: inline-block; font: inherit; font-weight: 600; font-size: .95rem; cursor: pointer;
  background: var(--accent); color: #fff; border: 0; border-radius: 8px; padding: 9px 16px; text-decoration: none;
}
.btn.ghost { background: transparent; color: var(--ink); border: 1px solid var(--border); font-weight: 500; }
.btn.ghost:hover { background: var(--accent-wash); }

/* Widgets */
.widget { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 18px; margin: 1.4em 0; }
.w-controls { display: grid; gap: 10px; margin-bottom: 14px; }
.ctl { display: grid; grid-template-columns: 190px minmax(0, 1fr) 150px; align-items: center; gap: 12px; }
.ctl-label { font-size: .9rem; color: var(--ink-2); }
.ctl output { font-variant-numeric: tabular-nums; font-size: .9rem; text-align: right; }
.ctl input[type=range] { width: 100%; accent-color: var(--accent); }
.seg { display: inline-flex; flex-wrap: wrap; border: 1px solid var(--border); border-radius: 8px; overflow: hidden; width: fit-content; max-width: 100%; }
.ctl .seg { grid-column: 2 / -1; }
.seg button { font: inherit; font-size: .9rem; padding: 6px 14px; border: 0; background: transparent; color: var(--ink); cursor: pointer; }
.seg button.on { background: var(--accent); color: #fff; }
.w-readout { display: grid; grid-template-columns: repeat(auto-fill, minmax(170px, 1fr)); gap: 8px; margin-bottom: 14px; }
.stat { background: var(--raised); border: 1px solid var(--border); border-radius: 8px; padding: 8px 10px; }
.stat > span { display: block; font-size: .78rem; color: var(--muted); line-height: 1.3; }
.stat b { font-size: 1.05rem; font-weight: 600; }
.stat.pos b { color: var(--pos); }
.stat.neg b { color: var(--neg); }
.home-stats { margin: 1.5em 0; }

/* Graphiques */
.chart { position: relative; width: 100%; margin-top: 6px; }
.chart svg { display: block; overflow: visible; }
.chart .grid line { stroke: var(--grid); stroke-width: 1; }
.chart .tick { fill: var(--muted); font-size: 11px; font-variant-numeric: tabular-nums; }
.chart .axis-title { fill: var(--ink-2); font-size: 12px; }
.chart .baseline { stroke: var(--axis); stroke-width: 1; }
.chart .mark-line { stroke: var(--axis); stroke-width: 1; }
.chart .mark-label { fill: var(--muted); font-size: 11px; }
.chart .series { fill: none; stroke-width: 2; stroke-linejoin: round; stroke-linecap: round; }
.chart .dot { stroke: var(--surface); stroke-width: 2; }
.chart .cross { stroke: var(--axis); stroke-width: 1; }
.chart-legend { display: flex; flex-wrap: wrap; gap: 14px; font-size: .85rem; color: var(--ink-2); min-height: 4px; }
.chart-legend span, .chart-tip div { display: inline-flex; align-items: center; gap: 6px; }
.chart-legend i, .chart-tip i { width: 10px; height: 10px; border-radius: 50%; display: inline-block; }
.chart-tip {
  display: none; position: absolute; pointer-events: none; background: var(--raised); border: 1px solid var(--border);
  border-radius: 8px; padding: 6px 10px; font-size: .82rem; box-shadow: 0 4px 16px rgba(0,0,0,.12); white-space: nowrap;
}
.chart-tip div { display: flex; gap: 6px; }
.chart-tip div span { margin-left: auto; padding-left: 10px; font-variant-numeric: tabular-nums; font-weight: 600; }

/* Quiz */
.quiz { display: grid; gap: 12px; margin: 1.6em 0; }
.q-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 16px 18px; }
.q-card.done { border-color: color-mix(in srgb, var(--pos) 45%, transparent); }
.q-head { display: flex; justify-content: space-between; font-size: .78rem; color: var(--muted); text-transform: uppercase; letter-spacing: .06em; font-weight: 600; }
.q-state { color: var(--pos); }
.q-text { margin: .4em 0 .8em; font-weight: 500; }
.q-options { display: grid; gap: 6px; }
.q-opt { text-align: left; font: inherit; padding: 9px 12px; border-radius: 8px; border: 1px solid var(--border); background: var(--raised); color: var(--ink); cursor: pointer; }
.q-opt:hover { border-color: var(--accent); }
.q-opt.sel-ok { background: var(--ok-wash); border-color: var(--pos); }
.q-opt.sel-ko { background: var(--ko-wash); border-color: var(--neg); }
.q-number { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.q-number input, .legs input, .legs select {
  font: inherit; padding: 7px 10px; border-radius: 8px; border: 1px solid var(--border); background: var(--raised); color: var(--ink); width: 140px;
}
.q-feedback { margin-top: 10px; font-size: .95rem; }
.q-feedback:empty { display: none; }
.q-feedback.ok, .q-feedback.ko { padding: 10px 12px; border-radius: 8px; }
.q-feedback.ok { background: var(--ok-wash); }
.q-feedback.ko { background: var(--ko-wash); }
.lesson-foot { margin-top: 3em; padding-top: 1.5em; border-top: 1px solid var(--grid); }

/* Labo */
.lab-presets { display: flex; flex-wrap: wrap; gap: 8px; margin: 1em 0; }
.lab-market { display: grid; gap: 10px; margin: 1em 0; }
.legs { width: 100%; border-collapse: collapse; margin: 1em 0 .6em; font-size: .9rem; }
.legs th { text-align: left; font-weight: 600; color: var(--ink-2); padding: 6px; border-bottom: 1px solid var(--grid); }
.legs td { padding: 4px 6px; }
.legs input, .legs select { width: 100%; min-width: 70px; padding: 5px 8px; }
.legs .num { font-variant-numeric: tabular-nums; white-space: nowrap; }

/* Téléphone */
@media (max-width: 860px) {
  .topbar {
    display: flex; align-items: center; gap: 10px; position: sticky; top: 0; z-index: 3;
    background: var(--surface); border-bottom: 1px solid var(--border); padding: 8px 16px;
  }
  .brand { font-weight: 600; }
  #nav { z-index: 4; top: 53px; transform: translateX(-100%); transition: transform .2s; }
  body.nav-open #nav { transform: none; }
  main { margin-left: 0; padding: 24px 16px 80px; }
  h1 { font-size: 1.6rem; }
  .ctl { grid-template-columns: 1fr auto; }
  .ctl-label { grid-column: 1 / -1; }
  .ctl input[type=range] { grid-column: 1; }
  .ctl .seg { grid-column: 1 / -1; }
  .legs { display: block; overflow-x: auto; }
}

[hidden] { display: none !important; }

/* Formules */
.katex { font-size: 1.08em; }
.katex-display { overflow-x: auto; overflow-y: hidden; padding: 2px 0; }
.formula { margin: 1em 0; padding: .4em 1.1em; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); }
.formula .legend { margin: .2em 0 .6em; }

/* Glossaire */
.term { text-decoration: underline dotted; text-decoration-color: var(--muted); text-underline-offset: 3px; cursor: help; }
.term:hover, .term:focus-visible { text-decoration-color: var(--accent); outline: none; background: var(--accent-wash); border-radius: 3px; }
#gloss-pop { position: fixed; z-index: 50; max-width: min(340px, calc(100vw - 16px)); padding: .65em .85em; background: var(--raised); color: var(--ink); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: 0 6px 24px rgba(0,0,0,.18); font-size: .9rem; line-height: 1.45; pointer-events: none; }
#gloss-pop b { display: block; margin-bottom: .2em; }
#gloss-pop span { color: var(--ink-2); }
.glossary dt { font-weight: 600; margin-top: 1em; }
.glossary dd { margin: .2em 0 0; color: var(--ink-2); }

/* Simulateur */
main.wide { max-width: 1400px; }
.sim-help { margin: 1.2em 0; border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface); }
.sim-help summary { cursor: pointer; padding: .6em .9em; font-weight: 600; font-size: .95rem; }
.sim-help > div { padding: 0 1em .6em; font-size: .93rem; color: var(--ink-2); }
.sim-resume { display: flex; flex-wrap: wrap; gap: .6em 1em; align-items: center; }
.sim-missions { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 12px; }
.sim-card { display: flex; flex-direction: column; gap: .4em; padding: 14px; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); }
.sim-card p { margin: 0; font-size: .92rem; color: var(--ink-2); flex: 1; }
.sim-card small { color: var(--muted); }
.sim-card .btn { align-self: flex-start; }
.sim-card.done { border-color: var(--s3); }
.sim-card-top { display: flex; justify-content: space-between; gap: 8px; }
.stars, .sim-stars { color: #d9a400; letter-spacing: 2px; white-space: nowrap; }
.sim-stars { font-size: 2rem; margin: .2em 0; }
.sim-free { padding: 14px; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); }
.sim-free p { margin-top: 0; }
.sim-free-row { display: flex; flex-wrap: wrap; gap: 10px 14px; align-items: flex-end; }
.sim-free-row label { display: flex; flex-direction: column; font-size: .85rem; color: var(--ink-2); gap: 4px; }
.sim-free input, .sim-free select, .sim-order select, .sim-legs select { font: inherit; padding: 5px 8px; border: 1px solid var(--border); border-radius: 6px; background: var(--raised); color: var(--ink); }
.sim-top { position: sticky; top: 0; z-index: 3; background: var(--page); padding: 8px 0 10px; border-bottom: 1px solid var(--border); margin-bottom: 14px; }
.sim-title { display: flex; flex-direction: column; margin-bottom: 6px; }
.sim-title .kicker { margin: 0; }
.sim-bar { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 8px; }
.stat > small { display: block; font-size: .78rem; color: var(--muted); }
.sim-actions { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 10px; }
.sim-layout { display: grid; grid-template-columns: minmax(0, 1fr) 330px; gap: 20px; align-items: start; }
.sim-coach { position: sticky; top: 200px; max-height: calc(100vh - 220px); overflow-y: auto; padding: 12px; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); }
.sim-coach h3 { margin-top: 0; }
.sim-step { padding: 10px 12px; margin-bottom: 10px; border-left: 3px solid var(--accent); background: var(--accent-wash); border-radius: 6px; font-size: .93rem; }
.sim-step small { color: var(--muted); }
.sim-step p { margin: .4em 0; }
.sim-obj { font-size: .9rem; margin-bottom: 10px; }
.sim-obj ul, .sim-obj-end { list-style: none; padding: 0; margin: .3em 0; }
.sim-obj li.ok, .sim-obj-end li.ok { color: var(--pos); }
.sim-log { display: flex; flex-direction: column; gap: 8px; }
.sim-msg { font-size: .88rem; line-height: 1.45; padding: 8px 10px; border-radius: 6px; background: var(--raised); border: 1px solid var(--border); }
.sim-msg.good { border-left: 3px solid var(--pos); }
.sim-msg.alert { border-left: 3px solid var(--neg); }
.sim-msg.info { border-left: 3px solid var(--accent); }
.sim-attr { margin-top: 6px; }
.sim-attr-detail { display: block; color: var(--muted); font-size: .82rem; }
.sim-tabs { display: flex; flex-wrap: wrap; gap: 4px; border-bottom: 1px solid var(--border); margin-bottom: 14px; }
.sim-tabs button { font: inherit; font-size: .95rem; padding: 8px 14px; border: 0; border-bottom: 2px solid transparent; background: none; color: var(--ink-2); cursor: pointer; }
.sim-tabs button.on { color: var(--ink); border-bottom-color: var(--accent); font-weight: 600; }
.sim-stats { grid-template-columns: repeat(auto-fit, minmax(170px, 1fr)); }
.sim-read ul { margin: .4em 0 0; padding-left: 1.2em; }
.sim-chain-head { display: flex; flex-wrap: wrap; gap: 10px 20px; align-items: center; }
.sim-check { font-size: .9rem; color: var(--ink-2); }
.sim-chain-wrap { overflow-x: auto; max-height: 420px; overflow-y: auto; border: 1px solid var(--border); border-radius: var(--radius); }
.sim-chain { border-collapse: collapse; width: 100%; font-size: .88rem; font-variant-numeric: tabular-nums; }
.sim-chain th, .sim-chain td { padding: 4px 8px; text-align: right; border-bottom: 1px solid var(--grid); white-space: nowrap; }
.sim-chain thead th { position: sticky; top: 0; background: var(--surface); }
.sim-chain tbody th { text-align: center; background: var(--surface); }
.sim-chain tr.atm th { background: var(--accent-wash); }
.sim-chain tr.above td { color: var(--muted); }
.sim-chain td.px { cursor: pointer; color: var(--ink); }
.sim-chain td.px:hover { background: var(--accent-wash); }
.sim-presets { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 8px; }
.sim-presets .btn.on { background: var(--accent); color: #fff; border-color: var(--accent); }
.sim-legs { font-size: .88rem; }
.sim-legs td, .sim-legs th { padding: 5px 6px; white-space: nowrap; }
.mini { font: inherit; font-size: .82rem; padding: 2px 7px; border: 1px solid var(--border); border-radius: 5px; background: var(--raised); color: var(--ink); cursor: pointer; }
.mini.buy { color: var(--pos); border-color: var(--pos); }
.mini.sell { color: var(--neg); border-color: var(--neg); }
.sim-ticket .w-readout { grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); }
.sim-warn { margin: .5em 0; padding: .5em .8em; border-radius: 6px; font-size: .9rem; background: var(--raised); border: 1px solid var(--border); }
.sim-warn.neg { border-left: 3px solid var(--neg); }
.sim-warn.pos { border-left: 3px solid var(--pos); }
.sim-order { display: flex; flex-wrap: wrap; gap: 10px 14px; align-items: center; margin: 12px 0; font-size: .9rem; }
.sim-pos { padding: 14px; margin-bottom: 14px; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); }
.sim-pos.tp { border-color: var(--pos); }
.sim-pos.sl { border-color: var(--neg); }
.sim-pos-head { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 6px; }
.sim-pos-head span { color: var(--muted); font-size: .88rem; }
.sim-pos-legs { margin: .4em 0; padding-left: 1.2em; font-size: .9rem; }
.sim-gauge { display: grid; grid-template-columns: auto 1fr auto; gap: 10px; align-items: center; font-size: .8rem; color: var(--muted); margin: 10px 0; }
.sim-gauge div { position: relative; height: 8px; border-radius: 4px; background: linear-gradient(90deg, var(--neg), var(--grid) 50%, var(--pos)); opacity: .8; }
.sim-gauge i { position: absolute; top: -4px; width: 4px; height: 16px; margin-left: -2px; background: var(--ink); border-radius: 2px; }
td.pos { color: var(--pos); } td.neg { color: var(--neg); }
@media (max-width: 1100px) {
  .sim-layout { grid-template-columns: 1fr; }
  .sim-coach { position: static; max-height: none; order: -1; }
  .sim-top { position: static; }
}
.sim-legs { display: block; overflow-x: auto; max-width: 100%; }
.sim-skew-read { font-size: .9rem; color: var(--ink-2); }