:root {
  --bg: #0f1420; --card: #171e2e; --border: #263049; --text: #e6e9f0; --muted: #8b95ab;
  --accent: #4f8cff; --green: #2fbf71; --red: #ef5b5b; --amber: #f2b84b;
}
* { box-sizing: border-box; }
body { margin: 0; font-family: system-ui, -apple-system, "Segoe UI", sans-serif; background: var(--bg); color: var(--text); }
header { display: flex; justify-content: space-between; align-items: center; padding: 14px 24px; border-bottom: 1px solid var(--border); flex-wrap: wrap; gap: 10px; }
.brand { font-weight: 800; font-size: 22px; letter-spacing: .5px; }
.brand span { color: var(--accent); }
nav { display: flex; gap: 6px; }
.tab { background: transparent; color: var(--muted); border: 1px solid transparent; padding: 8px 14px; border-radius: 8px; cursor: pointer; font-size: 14px; }
.tab.active { color: var(--text); border-color: var(--border); background: var(--card); }
.disclaimer { margin: 0; padding: 8px 24px; font-size: 12px; color: var(--amber); background: rgba(242,184,75,.07); }
main { max-width: 1200px; margin: 0 auto; padding: 18px 16px; display: grid; grid-template-columns: 300px 1fr; gap: 16px; }
.market { grid-row: span 2; align-self: start; position: sticky; top: 12px; }
.panel { display: flex; flex-direction: column; gap: 16px; min-width: 0; }
.hidden { display: none; }
.card { background: var(--card); border: 1px solid var(--border); border-radius: 12px; padding: 16px; }
h2 { margin: 0 0 12px; font-size: 15px; text-transform: uppercase; letter-spacing: 1px; color: var(--muted); }
.sliders { display: flex; flex-direction: column; gap: 14px; }
label { display: flex; flex-direction: column; gap: 6px; font-size: 13px; color: var(--muted); }
.sliders label { position: relative; }
output { position: absolute; right: 0; top: 0; color: var(--text); font-variant-numeric: tabular-nums; }
input[type=range] { width: 100%; accent-color: var(--accent); }
input[type=number], select { background: var(--bg); color: var(--text); border: 1px solid var(--border); border-radius: 8px; padding: 7px 9px; font-size: 14px; width: 100%; }
.row { display: flex; gap: 12px; align-items: flex-end; flex-wrap: wrap; }
.row > label { flex: 1; min-width: 120px; }
.grow { flex: 3 !important; }
button { background: var(--accent); color: white; border: 0; border-radius: 8px; padding: 9px 14px; cursor: pointer; font-size: 14px; }
button:disabled { opacity: .45; cursor: not-allowed; }
button.secondary { background: transparent; border: 1px solid var(--border); color: var(--text); }
button.icon { background: transparent; color: var(--muted); padding: 4px 8px; }
button.icon:hover { color: var(--red); }
.muted { color: var(--muted); } .small { font-size: 13px; line-height: 1.5; }
table.legs { width: 100%; border-collapse: collapse; margin: 12px 0; font-size: 14px; }
.legs th { text-align: left; color: var(--muted); font-weight: 500; padding: 4px 6px; font-size: 12px; }
.legs td { padding: 4px 6px; }
.legs td.premium { font-variant-numeric: tabular-nums; color: var(--muted); }
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 10px; }
.stat { background: var(--card); border: 1px solid var(--border); border-radius: 10px; padding: 12px; }
.stat .k { font-size: 12px; color: var(--muted); }
.stat .v { font-size: 20px; font-weight: 700; margin-top: 4px; font-variant-numeric: tabular-nums; }
.pos { color: var(--green); } .neg { color: var(--red); }
.chart { width: 100%; height: 440px; }
.error { color: var(--red); }
footer { text-align: center; padding: 20px; }
footer a { color: var(--accent); }
/* ticker */
.ticker-box { margin-bottom: 16px; padding-bottom: 14px; border-bottom: 1px solid var(--border); }
.row.tight { gap: 6px; flex-wrap: nowrap; }
input[type=text] { background: var(--bg); color: var(--text); border: 1px solid var(--border); border-radius: 8px; padding: 7px 9px; font-size: 14px; width: 100%; min-width: 0; }
#ticker-info { margin-top: 8px; line-height: 1.5; }
#ticker-info b { color: var(--text); }
.mini-chart { height: 140px; margin-top: 14px; }

/* tableaux et grilles */
.table-wrap { overflow-x: auto; }
.legs select, .legs input { min-width: 70px; }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.grid2 > * { min-width: 0; }
.small-chart { height: 320px; }
.sliders-inline { margin-top: 14px; }
.sliders-inline label { position: relative; }
.intro { margin-top: 0; }
.card .row + .row { margin-top: 14px; }

/* mode apprentissage : pas de panneau marché */
main.learn-mode { grid-template-columns: 1fr; }
main.learn-mode .market { display: none; }
.learn { display: grid; grid-template-columns: 280px 1fr; gap: 16px; align-items: start; }
.lesson-list { position: sticky; top: 12px; max-height: calc(100vh - 24px); overflow-y: auto; }
.lesson-list ol { list-style: none; padding: 0; margin: 12px 0 0; display: flex; flex-direction: column; gap: 2px; }
.lesson-list li button { width: 100%; text-align: left; background: transparent; color: var(--muted); padding: 8px 10px; border-radius: 8px; display: flex; gap: 8px; align-items: center; }
.lesson-list li button:hover { background: var(--bg); color: var(--text); }
.lesson-list li button.current { background: var(--bg); color: var(--text); border: 1px solid var(--border); }
.lesson-list .check { width: 18px; height: 18px; border-radius: 50%; border: 1px solid var(--border); flex: none; font-size: 11px; display: grid; place-items: center; }
.lesson-list .done .check { background: var(--green); border-color: var(--green); color: #0f1420; }
.lesson-list .module { font-size: 11px; text-transform: uppercase; letter-spacing: 1px; color: var(--muted); margin: 12px 0 4px 4px; }
.progress-bar { height: 6px; background: var(--bg); border-radius: 4px; margin-top: 6px; overflow: hidden; }
#progress-fill { height: 100%; background: var(--green); width: 0; transition: width .3s; }
.lesson { line-height: 1.65; font-size: 15px; min-width: 0; }
.lesson h1 { font-size: 24px; margin: 4px 0 6px; }
.lesson h3 { font-size: 17px; margin: 24px 0 8px; }
.lesson .meta { color: var(--muted); font-size: 13px; }
.lesson .formula { background: var(--bg); border: 1px solid var(--border); border-radius: 8px; padding: 10px 14px; font-family: "Cambria Math", Georgia, serif; font-size: 16px; overflow-x: auto; white-space: nowrap; }
.lesson .example { border-left: 3px solid var(--accent); background: rgba(79,140,255,.08); padding: 10px 14px; border-radius: 0 8px 8px 0; margin: 12px 0; }
.lesson .key { border-left: 3px solid var(--green); background: rgba(47,191,113,.08); padding: 10px 14px; border-radius: 0 8px 8px 0; margin: 12px 0; }
.lesson table { border-collapse: collapse; margin: 10px 0; font-size: 14px; }
.lesson td, .lesson th { border: 1px solid var(--border); padding: 6px 10px; text-align: left; }
.lesson .try { margin: 14px 0; }
.quiz { margin-top: 28px; border-top: 1px solid var(--border); padding-top: 8px; }
.question { margin: 16px 0; }
.question p { margin: 0 0 8px; font-weight: 600; }
.choices { display: flex; flex-direction: column; gap: 6px; }
.choices button { text-align: left; background: var(--bg); color: var(--text); border: 1px solid var(--border); }
.choices button:hover:not(:disabled) { border-color: var(--accent); }
.choices button.right { border-color: var(--green); background: rgba(47,191,113,.12); }
.choices button.wrong { border-color: var(--red); background: rgba(239,91,91,.12); }
.choices button:disabled { cursor: default; opacity: 1; }
.explain { font-size: 14px; color: var(--muted); margin-top: 6px; }
.lesson-nav { display: flex; justify-content: space-between; margin-top: 24px; gap: 10px; }
.score { font-weight: 700; margin-top: 12px; }

/* portefeuille */
.pf-title { font-size: 22px; margin: 0 0 6px; }
.auth-form { display: flex; flex-direction: column; gap: 12px; }
.auth-form h2 { margin-bottom: 0; }
input[type=email], input[type=password] { background: var(--bg); color: var(--text); border: 1px solid var(--border); border-radius: 8px; padding: 7px 9px; font-size: 14px; width: 100%; }
.form-msg:empty, #pf-notice:empty, .quote-box:empty { display: none; }
.pf-head { display: flex; justify-content: space-between; align-items: center; gap: 10px; flex-wrap: wrap; }
.quote-box { margin-top: 12px; padding: 10px 14px; border-radius: 8px; background: var(--bg); border: 1px solid var(--border); line-height: 1.7; }
table.data { width: 100%; border-collapse: collapse; font-size: 13px; font-variant-numeric: tabular-nums; }
.data th { text-align: left; color: var(--muted); font-weight: 500; padding: 6px 8px; border-bottom: 1px solid var(--border); white-space: nowrap; }
.data td { padding: 7px 8px; border-bottom: 1px solid var(--border); white-space: nowrap; }
.small-btn { padding: 4px 10px; font-size: 13px; }
.data tr.me td { background: rgba(79,140,255,.10); }
.data .empty { color: var(--muted); text-align: center; padding: 18px; white-space: normal; }
.panel > .card h2, .grid2 .card h2 { margin-bottom: 12px; }
#tab-portfolio { gap: 16px; }
#pf-auth, #pf-app { display: flex; flex-direction: column; gap: 16px; }
#pf-auth.hidden, #pf-app.hidden { display: none; }

@media (max-width: 860px) {
  main { grid-template-columns: 1fr; }
  .market { position: static; grid-row: auto; }
  .chart { height: 340px; }
  .grid2, .learn { grid-template-columns: 1fr; }
  .lesson-list { position: static; }
  header { padding: 12px 16px; }
  nav { overflow-x: auto; max-width: 100%; }
  .tab { white-space: nowrap; padding: 8px 10px; }
}