/* Options Academy — design system */
:root{
  --bg:#0a0e14; --bg2:#0f141d; --card:#131a26; --card2:#182134; --line:#232f45;
  --text:#e8eef7; --muted:#8fa1b8; --faint:#5b6b82;
  --green:#34d399; --green-dim:rgba(52,211,153,.14); --red:#f87171; --red-dim:rgba(248,113,113,.13);
  --blue:#60a5fa; --blue-dim:rgba(96,165,250,.14); --purple:#a78bfa; --purple-dim:rgba(167,139,250,.14);
  --amber:#fbbf24; --amber-dim:rgba(251,191,36,.13);
  --radius:14px; --radius-sm:9px; --maxw:1180px;
  --font:-apple-system,BlinkMacSystemFont,"Segoe UI",Inter,Roboto,"Helvetica Neue",Arial,sans-serif;
  --mono:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{background:var(--bg);color:var(--text);font-family:var(--font);line-height:1.6;-webkit-font-smoothing:antialiased}
a{color:var(--blue);text-decoration:none}
a:hover{text-decoration:underline}
h1,h2,h3,h4{line-height:1.25;font-weight:700;letter-spacing:-.01em}
code,.mono{font-family:var(--mono);font-size:.92em;background:var(--bg2);padding:.1em .4em;border-radius:5px}
button{font-family:var(--font);cursor:pointer}
input,select,textarea{font-family:var(--font);font-size:1rem}

/* Nav */
#topnav{position:sticky;top:0;z-index:50;background:rgba(10,14,20,.85);backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
.nav-inner{max-width:var(--maxw);margin:0 auto;display:flex;align-items:center;gap:1.4rem;padding:.65rem 1.2rem}
.brand{display:flex;align-items:center;gap:.5rem;color:var(--text)}
.brand:hover{text-decoration:none}
.brand-mark{display:grid;place-items:center;width:34px;height:34px;border-radius:10px;background:linear-gradient(135deg,var(--green),var(--blue));color:#04121f;font-weight:800;font-size:1.25rem}
.brand-name{font-weight:600;font-size:1.08rem}.brand-name b{font-weight:800;color:var(--green)}
#mainnav{display:flex;gap:.2rem;flex:1;flex-wrap:wrap}
#mainnav a{color:var(--muted);padding:.42rem .68rem;border-radius:8px;font-size:.93rem;font-weight:500}
#mainnav a:hover{color:var(--text);background:var(--card);text-decoration:none}
#mainnav a.active{color:var(--green);background:var(--green-dim)}
.nav-right{display:flex;align-items:center;gap:.7rem}
#xp-widget{display:flex;align-items:center;gap:.5rem}
#xp-level{font-size:.8rem;font-weight:700;color:var(--amber);white-space:nowrap}
#xp-bar{width:90px;height:8px;border-radius:99px;background:var(--card2);overflow:hidden}
#xp-fill{height:100%;width:0%;border-radius:99px;background:linear-gradient(90deg,var(--amber),var(--green));transition:width .5s}
#nav-toggle{display:none;background:none;border:1px solid var(--line);color:var(--text);border-radius:8px;padding:.3rem .6rem;font-size:1.1rem}

/* Layout */
#app{max-width:var(--maxw);margin:0 auto;padding:2rem 1.2rem 4rem;min-height:70vh}
.page-head{margin-bottom:1.8rem}
.page-head h1{font-size:clamp(1.6rem,4vw,2.4rem)}
.page-head .sub{color:var(--muted);max-width:760px;margin-top:.5rem;font-size:1.02rem}
.kicker{display:inline-block;font-size:.75rem;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--green);background:var(--green-dim);padding:.25rem .7rem;border-radius:99px;margin-bottom:.8rem}
.grid{display:grid;gap:1rem}
.grid.cols-2{grid-template-columns:repeat(auto-fill,minmax(340px,1fr))}
.grid.cols-3{grid-template-columns:repeat(auto-fill,minmax(300px,1fr))}
.grid.cols-4{grid-template-columns:repeat(auto-fill,minmax(240px,1fr))}

/* Cards */
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:1.3rem;transition:border-color .2s,transform .2s}
.card.hoverable:hover{border-color:var(--green);transform:translateY(-2px)}
.card h3{margin-bottom:.35rem;font-size:1.12rem}
.card .muted{color:var(--muted);font-size:.93rem}
.card-link{display:block;color:var(--text)}
.card-link:hover{text-decoration:none}
.tag{display:inline-block;font-size:.7rem;font-weight:700;letter-spacing:.06em;text-transform:uppercase;padding:.18rem .55rem;border-radius:99px;margin-right:.35rem}
.tag.beginner{background:var(--green-dim);color:var(--green)}
.tag.intermediate{background:var(--blue-dim);color:var(--blue)}
.tag.advanced{background:var(--purple-dim);color:var(--purple)}
.tag.professional{background:var(--amber-dim);color:var(--amber)}
.tag.master{background:var(--red-dim);color:var(--red)}
.tag.income{background:var(--green-dim);color:var(--green)}
.tag.defined{background:var(--blue-dim);color:var(--blue)}
.tag.undefined{background:var(--red-dim);color:var(--red)}
.tag.neutral{background:var(--purple-dim);color:var(--purple)}
.tag.volatility{background:var(--amber-dim);color:var(--amber)}
.progress-dots{display:flex;gap:.3rem;margin-top:.8rem}
.pdot{width:9px;height:9px;border-radius:50%;background:var(--card2);border:1px solid var(--line)}
.pdot.done{background:var(--green);border-color:var(--green)}

/* Lesson / article body */
.article{max-width:820px}
.article h2{font-size:1.45rem;margin:2.2rem 0 .8rem;padding-top:1.4rem;border-top:1px solid var(--line)}
.article h2:first-of-type{border-top:none;padding-top:0;margin-top:1.4rem}
.article h3{font-size:1.15rem;margin:1.4rem 0 .5rem}
.article p{margin:.7rem 0;color:#cfd9e6}
.article ul,.article ol{margin:.7rem 0 .7rem 1.4rem;color:#cfd9e6}
.article li{margin:.3rem 0}
.article strong{color:var(--text)}
.callout{border-radius:var(--radius-sm);padding:1rem 1.2rem;margin:1.1rem 0;border:1px solid var(--line);background:var(--card2)}
.callout .co-title{font-weight:700;font-size:.85rem;letter-spacing:.05em;text-transform:uppercase;margin-bottom:.35rem}
.callout.analogy{border-color:rgba(96,165,250,.4);background:var(--blue-dim)}
.callout.analogy .co-title{color:var(--blue)}
.callout.warning{border-color:rgba(248,113,113,.4);background:var(--red-dim)}
.callout.warning .co-title{color:var(--red)}
.callout.protip{border-color:rgba(52,211,153,.4);background:var(--green-dim)}
.callout.protip .co-title{color:var(--green)}
.callout.math{border-color:rgba(167,139,250,.4);background:var(--purple-dim)}
.callout.math .co-title{color:var(--purple)}
.callout p{color:#dbe4ef}


/* Buttons & forms */
.btn{display:inline-block;border:1px solid var(--line);background:var(--card2);color:var(--text);padding:.55rem 1.1rem;border-radius:9px;font-weight:600;font-size:.93rem}
.btn:hover{border-color:var(--green);text-decoration:none}
.btn.primary{background:linear-gradient(135deg,var(--green),#22b8cf);color:#04121f;border:none}
.btn.primary:hover{filter:brightness(1.1)}
.btn.ghost{background:transparent}
.btn.small{padding:.32rem .75rem;font-size:.83rem}
.btn:disabled{opacity:.45;cursor:not-allowed}
.field{margin-bottom:1rem}
.field label{display:block;font-size:.85rem;color:var(--muted);margin-bottom:.3rem;font-weight:600}
.field input,.field select,.field textarea{width:100%;background:var(--bg2);border:1px solid var(--line);color:var(--text);border-radius:8px;padding:.55rem .75rem}
.field input:focus,.field select:focus,.field textarea:focus{outline:none;border-color:var(--green)}
.slider-row{display:flex;align-items:center;gap:.9rem;margin:.55rem 0}
.slider-row label{min-width:150px;font-size:.88rem;color:var(--muted);font-weight:600}
.slider-row input[type=range]{flex:1;accent-color:var(--green)}
.slider-row input[type=range]:disabled{accent-color:var(--faint)}
.slider-row .val{min-width:86px;text-align:right;font-family:var(--mono);font-size:.9rem;color:var(--green)}

/* Quiz */
.quiz{margin:1.6rem 0;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}
.quiz-head{background:var(--card2);padding:.8rem 1.2rem;font-weight:700;font-size:.85rem;letter-spacing:.08em;text-transform:uppercase;color:var(--amber)}
.quiz-q{padding:1.1rem 1.2rem;border-top:1px solid var(--line)}
.quiz-q .q-text{font-weight:600;margin-bottom:.8rem}
.quiz-opts{display:grid;gap:.5rem}
.quiz-opt{text-align:left;background:var(--bg2);border:1px solid var(--line);color:var(--text);border-radius:9px;padding:.65rem .9rem;font-size:.95rem;transition:all .15s}
.quiz-opt:hover{border-color:var(--blue)}
.quiz-opt.correct{border-color:var(--green);background:var(--green-dim)}
.quiz-opt.wrong{border-color:var(--red);background:var(--red-dim)}
.quiz-explain{display:none;margin-top:.8rem;padding:.8rem 1rem;border-radius:8px;background:var(--blue-dim);border:1px solid rgba(96,165,250,.35);font-size:.92rem;color:#dbe4ef}
.quiz-explain.show{display:block}

/* Stats & tables */
.stat-row{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:.8rem;margin:1.2rem 0}
.stat{background:var(--card2);border:1px solid var(--line);border-radius:var(--radius-sm);padding:.9rem;text-align:center}
.stat .stat-val{font-size:1.35rem;font-weight:800;color:var(--green);font-family:var(--mono)}
.stat .stat-val.red{color:var(--red)}.stat .stat-val.blue{color:var(--blue)}.stat .stat-val.amber{color:var(--amber)}
.stat .stat-label{font-size:.75rem;color:var(--muted);text-transform:uppercase;letter-spacing:.07em;margin-top:.2rem}
table.tbl{width:100%;border-collapse:collapse;margin:1.2rem 0;font-size:.92rem}
.tbl th{text-align:left;padding:.6rem .8rem;background:var(--card2);color:var(--muted);font-size:.78rem;text-transform:uppercase;letter-spacing:.06em;border-bottom:1px solid var(--line)}
.tbl td{padding:.6rem .8rem;border-bottom:1px solid var(--line);color:#cfd9e6}
.tbl tr:hover td{background:rgba(96,165,250,.04)}

/* Hero */
.hero{padding:3.2rem 0 2.4rem;text-align:center}
.hero h1{font-size:clamp(2rem,5.5vw,3.3rem);letter-spacing:-.02em}
.hero h1 .grad{background:linear-gradient(90deg,var(--green),var(--blue),var(--purple));-webkit-background-clip:text;background-clip:text;color:transparent}
.hero .lede{color:var(--muted);max-width:720px;margin:1.1rem auto 1.6rem;font-size:1.1rem}
.hero-cta{display:flex;gap:.8rem;justify-content:center;flex-wrap:wrap}
.belt{display:flex;gap:1.6rem;justify-content:center;flex-wrap:wrap;margin-top:2.6rem;color:var(--faint);font-size:.85rem}
.belt span b{color:var(--text)}

/* Simulators */
.sim-tabs{display:flex;gap:.4rem;flex-wrap:wrap;margin-bottom:1.4rem}
.sim-tab{background:var(--card);border:1px solid var(--line);color:var(--muted);border-radius:99px;padding:.45rem 1rem;font-size:.88rem;font-weight:600}
.sim-tab.active{color:var(--green);border-color:var(--green);background:var(--green-dim)}
.sim-panel{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:1.4rem}
.sim-grid{display:grid;grid-template-columns:300px 1fr;gap:1.6rem}
canvas.chart{width:100%;background:var(--bg2);border:1px solid var(--line);border-radius:var(--radius-sm)}
.leg-row{display:flex;gap:.5rem;align-items:center;margin-bottom:.5rem;flex-wrap:wrap}
.leg-row select,.leg-row input{background:var(--bg2);border:1px solid var(--line);color:var(--text);border-radius:7px;padding:.35rem .5rem;font-size:.88rem}
.leg-row input{width:80px}
.metrics{display:grid;grid-template-columns:repeat(auto-fit,minmax(130px,1fr));gap:.7rem;margin-top:1rem}
.metric{background:var(--bg2);border:1px solid var(--line);border-radius:8px;padding:.6rem .8rem}
.metric .m-label{font-size:.72rem;color:var(--muted);text-transform:uppercase;letter-spacing:.06em}
.metric .m-val{font-family:var(--mono);font-weight:700;font-size:1.02rem;margin-top:.15rem}
.m-val.pos{color:var(--green)}.m-val.neg{color:var(--red)}.m-val.neu{color:var(--blue)}

/* Mentor */
#mentor-fab{position:fixed;right:1.4rem;bottom:1.4rem;z-index:60;width:56px;height:56px;border-radius:50%;border:1px solid var(--line);background:linear-gradient(135deg,var(--card2),var(--card));font-size:1.5rem;box-shadow:0 8px 30px rgba(0,0,0,.5)}
#mentor-fab:hover{border-color:var(--purple)}
#mentor-panel{position:fixed;right:1.4rem;bottom:6.4rem;z-index:60;width:min(400px,calc(100vw - 2.8rem));max-height:65vh;display:flex;flex-direction:column;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:0 16px 60px rgba(0,0,0,.6)}
#mentor-panel.hidden{display:none}
.mentor-head{display:flex;justify-content:space-between;align-items:center;padding:.9rem 1.1rem;border-bottom:1px solid var(--line)}
.mentor-sub{display:block;font-size:.75rem;color:var(--muted);font-weight:400}
.mentor-head button{background:none;border:none;color:var(--muted);font-size:1rem}
#mentor-body{flex:1;overflow-y:auto;padding:1rem 1.1rem;display:flex;flex-direction:column;gap:.7rem}
.mentor-msg{background:var(--card2);border:1px solid var(--line);border-radius:10px;padding:.65rem .9rem;font-size:.9rem;color:#dbe4ef}
.mentor-msg.user{background:var(--blue-dim);border-color:rgba(96,165,250,.35);align-self:flex-end;max-width:88%}
.mentor-msg.bot{max-width:94%}
.mentor-msg .m-tag{font-size:.68rem;font-weight:700;text-transform:uppercase;letter-spacing:.08em;color:var(--purple);display:block;margin-bottom:.25rem}
.mentor-input-row{display:flex;gap:.5rem;padding:.8rem 1rem;border-top:1px solid var(--line)}
.mentor-input-row input{flex:1;background:var(--bg2);border:1px solid var(--line);color:var(--text);border-radius:8px;padding:.5rem .7rem;font-size:.9rem}
.mentor-input-row button{background:var(--purple);border:none;color:#14102a;border-radius:8px;padding:.5rem .9rem;font-weight:700}

/* Journal */
.journal-entry{border-left:3px solid var(--blue);background:var(--card);border-radius:0 var(--radius-sm) var(--radius-sm) 0;padding:1rem 1.2rem;margin-bottom:.9rem}
.journal-entry .je-head{display:flex;justify-content:space-between;gap:.8rem;flex-wrap:wrap;margin-bottom:.4rem}
.journal-entry .je-title{font-weight:700}
.journal-entry .je-date{font-size:.8rem;color:var(--faint)}
.journal-entry .je-body{font-size:.92rem;color:var(--muted)}
.journal-entry .je-outcome{margin-top:.5rem;font-family:var(--mono);font-weight:700}
.mistake-chip{display:inline-block;font-size:.72rem;background:var(--red-dim);color:var(--red);border-radius:99px;padding:.12rem .55rem;margin:.15rem .2rem 0 0}

/* Misc */
.breadcrumbs{font-size:.85rem;color:var(--faint);margin-bottom:1rem}
.breadcrumbs a{color:var(--muted)}
.locked{opacity:.55;filter:saturate(.5)}
.lock-note{font-size:.8rem;color:var(--amber);margin-top:.5rem}
.filter-row{display:flex;gap:.5rem;flex-wrap:wrap;margin-bottom:1.4rem}
.filter-chip{background:var(--card);border:1px solid var(--line);color:var(--muted);border-radius:99px;padding:.35rem .9rem;font-size:.84rem;font-weight:600}
.filter-chip.active{color:var(--text);border-color:var(--green);background:var(--green-dim)}
.toast{position:fixed;left:50%;bottom:2rem;transform:translateX(-50%);background:var(--card2);border:1px solid var(--green);color:var(--text);padding:.7rem 1.3rem;border-radius:99px;z-index:80;font-weight:600;box-shadow:0 10px 40px rgba(0,0,0,.5);animation:toastIn .3s ease}
@keyframes toastIn{from{opacity:0;transform:translate(-50%,12px)}to{opacity:1;transform:translate(-50%,0)}}
.xp-pop{position:fixed;z-index:90;pointer-events:none;color:var(--amber);font-weight:800;animation:xpFloat 1.1s ease forwards}
@keyframes xpFloat{from{opacity:1;transform:translateY(0)}to{opacity:0;transform:translateY(-46px)}}
#site-footer{border-top:1px solid var(--line);background:var(--bg2);margin-top:2rem}
.footer-inner{max-width:var(--maxw);margin:0 auto;padding:1.6rem 1.2rem;color:var(--faint);font-size:.85rem;display:flex;justify-content:space-between;gap:1.4rem;flex-wrap:wrap}
.footer-links a{color:var(--muted)}
.timeline{border-left:2px solid var(--line);margin:1.2rem 0 1.2rem .4rem;padding-left:1.4rem}
.timeline .tl-item{position:relative;margin-bottom:1.1rem}
.timeline .tl-item::before{content:"";position:absolute;left:-1.63rem;top:.4rem;width:10px;height:10px;border-radius:50%;background:var(--blue)}
.timeline .tl-date{font-family:var(--mono);font-size:.8rem;color:var(--faint)}

/* Responsive */
@media(max-width:900px){
  .sim-grid{grid-template-columns:1fr}
  #mainnav{display:none;position:absolute;top:100%;left:0;right:0;background:var(--bg2);border-bottom:1px solid var(--line);padding:.8rem 1.2rem;flex-direction:column}
  #mainnav.open{display:flex}
  #nav-toggle{display:block}
  #xp-bar{width:60px}
}