/* LEVER design system — warm paper, serif-led, losses never red */
:root{
  --paper:#FAF6EF; --card:#FFFDF8; --ink:#2A2622; --muted:#6E655B;
  --line:#E7DFD2; --accent:#C0673B; --accent-soft:#F0DDD0;
  --grow:#4E7A5A; --grow-soft:#DCE8DF; --grow-deep:#2f5540;
  --gold:#B98A2F; --dim:#C8BBA8;
  --r:12px; --r-lg:16px;
  --shadow:0 1px 0 rgba(0,0,0,.03);
  --dur:180ms;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--paper);color:var(--ink);
  font-family:Inter,system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  font-size:15px;line-height:1.55;-webkit-font-smoothing:antialiased}
h1,h2,h3{font-family:Fraunces,Georgia,serif;font-weight:600;letter-spacing:-.01em;line-height:1.15;margin:0 0 .35em}
h1{font-size:28px} h2{font-size:22px} h3{font-size:17px}
p{margin:.5em 0}
.muted{color:var(--muted)}
.small{font-size:13px}
.mono{font-family:"JetBrains Mono",ui-monospace,Menlo,monospace}

/* layout shell */
#screen{max-width:640px;margin:0 auto;padding:20px 16px 96px;min-height:70vh}
@media(min-width:900px){#screen{max-width:740px}}

/* ============ DESKTOP SHELL (≥1040px): left sidebar nav, per-screen widths ============ */
.tb-brand,.tb-meta{display:none}
.ws-side{display:none}
@media(min-width:1040px){
  body.nav{padding-left:216px}
  body.nav .tabbar{top:0;bottom:auto;left:0;right:auto;width:216px;height:100vh;flex-direction:column;
    border-top:0;border-right:1px solid var(--line);padding:18px 10px;gap:4px;align-items:stretch}
  body.nav .tabbar button{flex:0 0 auto;flex-direction:row;justify-content:flex-start;gap:11px;font-size:14px;
    padding:11px 14px;border-radius:12px;min-height:0;color:var(--ink)}
  body.nav .tabbar button:hover{background:var(--paper)}
  body.nav .tabbar button.on{background:var(--accent-soft);color:var(--accent)}
  body.nav .tabbar button .ico{font-size:17px}
  body.nav .tabbar button .dot{position:static;transform:none;margin-left:auto}
  body.nav .tb-brand{display:block;font-family:Fraunces,Georgia,serif;font-weight:700;font-size:25px;
    padding:4px 14px 18px;color:var(--ink)}
  body.nav .tb-brand b{color:var(--accent)}
  body.nav .tb-meta{display:block;margin-top:auto;padding:12px 14px 6px;font-size:12.5px;color:var(--muted);
    border-top:1px solid var(--line);font-family:"JetBrains Mono",ui-monospace,monospace}
  body.nav #screen>.brand{display:none}   /* sidebar already carries the brand */
  body.nav #screen{max-width:780px;padding:28px 34px 60px}
  body.nav.pg-wide #screen{max-width:1150px}
  h1{font-size:32px}
  /* card grid for hub pages */
  .cardgrid{display:grid;grid-template-columns:1fr 1fr;gap:16px;align-items:start}
  .cardgrid>.card{margin:0}
  /* duo: interactive mechanism pinned left, teaching column right */
  .duo{display:grid;grid-template-columns:minmax(0,1fr) 400px;gap:18px;align-items:start}
  .duo-main .card{position:sticky;top:16px;margin:0}
  /* journey: centered trail + sticky right rail */
  .journey-grid{display:grid;grid-template-columns:minmax(0,640px) 320px;gap:26px;justify-content:center}
  .jtrail{grid-column:1;grid-row:1}
  .jrail{grid-column:2;grid-row:1;position:sticky;top:18px;align-self:start}
  .jrail .card{margin:0 0 14px}
  .rail-extra{display:block!important}
  .stats{grid-template-columns:repeat(4,1fr)}
  /* workstation */
  .ws-grid{display:grid;grid-template-columns:minmax(0,1fr) 340px;gap:18px;align-items:start}
  .ws-main{min-width:0}
  .ws-side{display:block;position:sticky;top:16px}
  .m-only{display:none}
}
input[type=number]{font:inherit;font-family:"JetBrains Mono",ui-monospace,monospace;font-weight:600;
  width:90px;padding:9px 10px;border:1.5px solid var(--line);border-radius:10px;background:var(--card);color:var(--ink)}
.chipbtn{font:inherit;font-size:12px;font-weight:600;cursor:pointer;border:1.5px solid var(--line);
  border-radius:99px;padding:6px 12px;background:var(--card);color:var(--muted)}
.chipbtn:hover{border-color:var(--accent);color:var(--accent)}
.chipbtn.on{border-color:var(--accent);background:var(--accent-soft);color:var(--accent)}
.pl-pos{color:var(--grow-deep)} .pl-neg{color:var(--accent)}
.tabbar{position:fixed;left:0;right:0;bottom:0;z-index:50;display:flex;
  background:var(--card);border-top:1px solid var(--line);
  padding-bottom:env(safe-area-inset-bottom)}
.tabbar button{flex:1;background:none;border:0;padding:9px 0 7px;cursor:pointer;
  font:inherit;font-size:11px;font-weight:600;color:var(--muted);
  display:flex;flex-direction:column;align-items:center;gap:2px;min-height:52px}
.tabbar button .ico{font-size:19px;line-height:1}
.tabbar button.on{color:var(--accent)}
.tabbar button .dot{position:absolute;transform:translate(14px,-2px);width:8px;height:8px;border-radius:50%;background:var(--accent)}

/* components */
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--r-lg);
  padding:20px;margin:14px 0;box-shadow:var(--shadow)}
.card.flat{padding:14px 16px}
button.btn{font:inherit;font-weight:600;cursor:pointer;border:0;border-radius:var(--r);
  padding:13px 20px;background:var(--accent);color:#fff;min-height:44px;
  transition:opacity var(--dur),transform 60ms}
button.btn:hover{opacity:.93} button.btn:active{transform:translateY(1px)}
button.btn:disabled{opacity:.4;cursor:not-allowed}
button.btn.ghost{background:transparent;color:var(--accent);border:1.5px solid var(--accent-soft)}
button.btn.quiet{background:var(--grow-soft);color:var(--grow-deep)}
button.link{background:none;border:0;color:var(--muted);padding:6px 0;font:inherit;font-weight:500;font-size:14px;cursor:pointer}
.row{display:flex;gap:10px;flex-wrap:wrap;align-items:center;margin-top:14px}
.step{font-size:11.5px;color:var(--muted);text-transform:uppercase;letter-spacing:.09em;font-weight:600}
.chip{display:inline-block;font-size:11px;font-weight:600;color:var(--accent);
  background:var(--accent-soft);border-radius:99px;padding:3px 10px}
.chip.green{color:var(--grow-deep);background:var(--grow-soft)}

/* option buttons (answers) */
.opt{display:block;width:100%;text-align:left;background:var(--card);color:var(--ink);
  border:1.5px solid var(--line);border-radius:var(--r);padding:13px 15px;margin:8px 0;
  font:inherit;font-weight:500;cursor:pointer;min-height:44px;transition:border-color var(--dur)}
.opt:hover{border-color:var(--accent)}
.opt.sel{border-color:var(--accent);background:var(--accent-soft)}
.opt.right{border-color:var(--grow);background:var(--grow-soft)}
.opt.faded{opacity:.45}
.opt:disabled{cursor:default}

/* readout + levers */
.big{font-family:"JetBrains Mono",ui-monospace,monospace;font-size:31px;font-weight:600;color:var(--grow)}
.big.warn{color:var(--accent)}
label.ctrl{display:block;margin:14px 0 4px;font-weight:600;font-size:13.5px}
.ctrl-val{font-family:"JetBrains Mono",ui-monospace,monospace;color:var(--accent);font-weight:600}
input[type=range]{width:100%;accent-color:var(--accent);height:32px;margin:0}
input[type=range]:disabled{opacity:.45}

/* teaching beats */
.beat{background:var(--grow-soft);border-radius:var(--r);padding:13px 15px;margin-top:12px;font-size:14.5px}
.beat b{font-family:Fraunces,Georgia,serif}
.beat.nudge{background:var(--accent-soft)}

/* brand + today card + chapter bars */
.brand{font-family:Fraunces,Georgia,serif;font-weight:700;font-size:21px;letter-spacing:.01em}
.brand b{color:var(--accent)}
.bar{height:4px;background:var(--line);border-radius:99px;margin:6px 0 2px;overflow:hidden}
.bar i{display:block;height:100%;background:var(--grow);border-radius:99px;transition:width var(--dur)}

/* ============ JOURNEY TRAIL (Duolingo-style walked path) ============ */
.rail-extra{display:none}
.unit{margin:24px 0 4px}
.unit-head{display:flex;align-items:baseline;justify-content:space-between}
.unit-head h3{margin:0}
.trail{position:relative;padding:2px 0 6px}
.tnode{position:relative;display:flex;gap:16px;align-items:center;padding:13px 0 13px 6px;cursor:pointer;border-radius:14px}
.tnode:hover{background:rgba(192,103,59,.04)}
.tnode::before{content:"";position:absolute;left:32px;top:-44px;height:88px;border-left:3.5px solid var(--line);z-index:0}
.tnode:first-child::before{display:none}
.tnode.walked::before{border-left-color:var(--grow)}
.tdot{width:54px;height:54px;border-radius:50%;flex:none;display:flex;align-items:center;justify-content:center;
  font-size:20px;font-weight:700;background:var(--card);border:2.5px solid var(--line);color:var(--muted);
  position:relative;z-index:1;transition:transform var(--dur)}
.tnode.mastered .tdot{background:var(--grow);border-color:var(--grow-deep);color:#fff;box-shadow:0 3px 0 rgba(47,85,64,.35)}
.tnode.avail .tdot{border-color:var(--accent);color:var(--accent)}
.tnode.rec .tdot{background:var(--accent);border-color:#9c4f2b;color:#fff;transform:scale(1.14);
  box-shadow:0 4px 0 #9c4f2b;animation:pulse 2.4s infinite}
.tnode.locked .tdot{opacity:.55}
.tnode.soon{cursor:default}
.tnode.soon:hover{background:none}
.tnode.soon .tdot{border-style:dashed;opacity:.5}
.tnode.soon .tlabel{opacity:.55}
.tlabel{min-width:0}
.tlabel b{font-size:15.5px}
.tnode.rec .tlabel b{color:var(--accent)}
.tlabel .sub{font-size:12.5px;color:var(--muted);margin-top:1px}
.next-pill{display:inline-block;font-size:10px;font-weight:800;letter-spacing:.08em;color:#fff;background:var(--accent);
  border-radius:99px;padding:2px 8px;margin-left:8px;vertical-align:2px}
.rail-ch{display:block;width:100%;text-align:left;background:none;border:0;font:inherit;cursor:pointer;
  padding:9px 2px;border-bottom:1px solid var(--line)}
.rail-ch:last-child{border-bottom:0}
.rail-ch .rc-row{display:flex;justify-content:space-between;align-items:baseline;font-size:13.5px;font-weight:600}
.rail-ch .mono{font-size:12px;color:var(--muted)}

/* journey path (Learn tab) */
.chapter{margin:22px 0 6px;display:flex;align-items:baseline;justify-content:space-between}
.chapter h3{margin:0}
.node-row{display:flex;align-items:center;gap:12px;width:100%;text-align:left;
  background:var(--card);border:1.5px solid var(--line);border-radius:var(--r-lg);
  padding:13px 15px;margin:8px 0;font:inherit;cursor:pointer;transition:border-color var(--dur)}
.node-row:hover{border-color:var(--accent)}
.node-row .st{width:30px;height:30px;border-radius:50%;flex:none;display:flex;align-items:center;justify-content:center;
  font-size:13px;font-weight:700;background:var(--paper);border:1.5px solid var(--line)}
.node-row.mastered .st{background:var(--grow-soft);border-color:var(--grow);color:var(--grow-deep)}
.node-row.rec{border-color:var(--accent);animation:pulse 2.4s infinite}
.node-row.rec .st{border-color:var(--accent);color:var(--accent)}
.node-row.locked{opacity:.55}
.node-row.soon{border-style:dashed;opacity:.6;cursor:default}
.node-row .t{flex:1;min-width:0}
.node-row .t .name{font-weight:600}
.node-row .t .sub{font-size:12px;color:var(--muted)}
.node-row .badge{font-size:11px;font-weight:700;color:var(--accent)}
@keyframes pulse{0%,100%{box-shadow:0 0 0 0 var(--accent-soft)}50%{box-shadow:0 0 0 6px rgba(192,103,59,.10)}}
@media (prefers-reduced-motion:reduce){.node-row.rec{animation:none}}

/* progress ring (chapter) */
.ring{font-size:12px;font-weight:600;color:var(--muted)}

/* stats (You tab) */
.stats{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.stat{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:14px;text-align:center}
.stat .v{font-family:"JetBrains Mono",ui-monospace,monospace;font-size:24px;font-weight:600;color:var(--grow-deep)}
.stat .l{font-size:11.5px;color:var(--muted);margin-top:2px}

/* metrics strip (sim/allocate) */
.metrics{display:flex;gap:10px;flex-wrap:wrap;margin-top:12px}
.metric{flex:1;min-width:86px;background:var(--grow-soft);border-radius:var(--r);padding:10px 8px;text-align:center}
.metric .mv{font-family:"JetBrains Mono",ui-monospace,monospace;font-size:19px;font-weight:600;color:var(--grow-deep)}
.metric .ml{font-size:11px;color:var(--muted);margin-top:2px}

/* financials table (case archetype) */
table.fin{width:100%;border-collapse:collapse;font-size:14px;margin:4px 0 6px}
table.fin th{font-weight:600;color:var(--muted);font-size:12px;text-align:right;padding:6px 8px;border-bottom:1px solid var(--line)}
table.fin th:first-child{text-align:left}
table.fin td{padding:8px;text-align:right;border-bottom:1px solid var(--line);font-family:"JetBrains Mono",ui-monospace,monospace;font-size:13px}
table.fin td:first-child{text-align:left;font-weight:600;font-family:inherit;font-size:14px}

svg{width:100%;height:auto;display:block}
.viz{margin-top:8px}
hr{border:0;border-top:1px solid var(--line);margin:18px 0}
.footer-note{font-size:11.5px;color:var(--muted);text-align:center;margin-top:28px;line-height:1.5}
textarea{width:100%;font:inherit;font-size:13px;border:1px solid var(--line);border-radius:var(--r);padding:10px;background:var(--card)}
.fade-in{animation:fadein var(--dur) ease-out}
@keyframes fadein{from{opacity:0;transform:translateY(4px)}to{opacity:1;transform:none}}
@media (prefers-reduced-motion:reduce){.fade-in{animation:none}}