/* Frest Consult · shared UI for q4, academy and lab (Astra template tokens) */
:root{
  --bg:#f3f6f6;--bg2:#e8eff0;--paper:#fff;--mist:#e4edef;
  --ink:#111b20;--ink2:#3a474e;--ash:#6c787e;--line:#dde5e7;--line2:#c9d5d8;
  --teal:#3b7c88;--teal2:#5ec7d6;--tint:#e3f1f3;--night:#13222a;--night2:#1c3039;--on:#eef6f7;--on2:rgba(238,246,247,.72);
  --gold:#d6a13f;--goldt:#f6ead2;--warn:#8a5a00;--ok:#2f7d5b;--okt:#e2f3ea;--bad:#a8412f;--badt:#f8e4df;
  --sans:'Noto Sans',system-ui,-apple-system,'Segoe UI',sans-serif;--disp:'Noto Sans',system-ui,sans-serif;--mono:'IBM Plex Mono',ui-monospace,Menlo,Consolas,monospace;
  --r:14px;--r2:26px;--rp:999px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{animation:none!important;transition:none!important}}
body{margin:0;background:var(--bg);color:var(--ink);font:400 16px/1.55 var(--sans)}
img{max-width:100%;display:block}
a{color:var(--teal)}
h1,h2,h3{font-family:var(--disp);font-weight:300;letter-spacing:-.01em;line-height:1.08;margin:0}
h1{font-size:clamp(38px,6vw,78px)}h2{font-size:clamp(30px,4vw,52px)}h3{font-size:clamp(19px,1.8vw,24px);font-weight:400}
.t{color:var(--teal)}
p{margin:0 0 12px}
.wrap{width:min(1184px,100% - 32px);margin-inline:auto}
section{padding:clamp(56px,8vw,110px) 0}
.eyebrow{font-size:12px;letter-spacing:.16em;text-transform:uppercase;font-weight:700;color:var(--ink);margin:0 0 14px}
.lede{font-size:clamp(17px,1.4vw,20px);color:var(--ink2);max-width:58ch}
.small{font-size:13px}.muted{color:var(--ash)}
.row{display:flex;gap:10px;flex-wrap:wrap;align-items:center}
.grid2{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}
.grid3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}
.grid4{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px}
@media (max-width:980px){.grid3,.grid4{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (max-width:640px){.grid2,.grid3,.grid4{grid-template-columns:1fr}}
.panel{background:var(--paper);border:1px solid var(--line);border-radius:var(--r2);padding:clamp(20px,2.6vw,32px);min-width:0}
.night{background:var(--night);color:var(--on);border-radius:var(--r2);padding:clamp(20px,2.6vw,34px);min-width:0}
.night h2,.night h3{color:#fff}.night .muted{color:var(--on2)}
.head{display:flex;justify-content:space-between;align-items:flex-end;gap:24px;flex-wrap:wrap;margin-bottom:clamp(24px,3vw,40px)}
.head .aside{max-width:360px;color:var(--ink2);font-size:15px}

/* buttons + fields */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font:600 15px/1 var(--sans);padding:14px 20px;border-radius:var(--rp);border:1px solid var(--line2);background:#fff;color:var(--ink);cursor:pointer;text-decoration:none;min-height:46px;transition:transform .15s,background .2s}
.btn:hover{transform:translateY(-1px)}.btn:active{transform:none}
.btn.dark{background:var(--night);border-color:var(--night);color:var(--on)}
.btn.teal{background:var(--teal);border-color:var(--teal);color:#fff}
.btn.gold{background:var(--gold);border-color:var(--gold);color:#2a1d00}
.btn.ghost{background:transparent}
.btn.sm{padding:9px 14px;min-height:36px;font-size:13.5px}
.btn[disabled]{opacity:.5;cursor:not-allowed;transform:none}
.btn:focus-visible,a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:2px solid var(--teal2);outline-offset:2px}
label.f{display:block;font-size:13px;font-weight:600;margin:14px 0 6px;color:var(--ink2)}
input[type=email],input[type=text],input[type=password],input[type=search],input[type=url],input[type=number],select,textarea{width:100%;font:400 16px/1.4 var(--sans);padding:13px 16px;border-radius:14px;border:1px solid var(--line2);background:#fff;color:var(--ink)}
textarea{min-height:96px;resize:vertical}
.check{display:flex;gap:10px;align-items:flex-start;font-size:14px;color:var(--ink2);margin-top:12px;cursor:pointer}
.check input{width:20px;height:20px;margin-top:1px;accent-color:var(--teal)}
.msg{font-size:14px;margin-top:10px;min-height:1.4em}
.msg.err{color:var(--bad)}.msg.ok{color:var(--ok)}
.hp{position:absolute!important;left:-9999px!important;width:1px;height:1px;opacity:0}

/* nav */
.jnav{position:sticky;top:0;z-index:50;background:color-mix(in srgb,var(--bg) 90%,transparent);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
.jnav .in{display:flex;align-items:center;gap:14px;min-height:62px;padding-inline:clamp(16px,3vw,44px)}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink);white-space:nowrap;min-width:0}
.brand svg{width:40px;height:26px;flex:none}
.brand b{font-weight:700;font-size:16px;display:block}
.brand span{font-size:11.5px;color:var(--ash);display:block;line-height:1.1}
.jnav .sp{flex:1}
.jnav .who{font-size:13px;color:var(--ash);max-width:34vw;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.jnav .lnk{font-size:14px;text-decoration:none;color:var(--ink2);padding:8px 10px;border-radius:10px;white-space:nowrap}
.jnav .lnk:hover{background:var(--tint);color:var(--teal)}
@media (max-width:640px){.jnav .who,.jnav .hide-m{display:none}.brand span{display:none}}

/* markers: what is offered vs example vs explainer */
.mk{display:inline-flex;align-items:center;gap:7px;font-size:11px;letter-spacing:.14em;text-transform:uppercase;font-weight:700;border-radius:var(--rp);padding:5px 11px 5px 8px;margin-bottom:12px;white-space:nowrap}
.mk::before{content:"";width:12px;height:12px;border-radius:50%;flex:none}
.mk.course{background:var(--goldt);color:#6b4a10}.mk.course::before{background:var(--gold);box-shadow:0 0 0 3px rgba(214,161,63,.25)}
.mk.example{background:transparent;color:var(--teal);border:1.5px dashed var(--teal2)}.mk.example::before{border:2px dashed var(--teal);background:transparent;width:9px;height:9px}
.mk.how{background:var(--mist);color:var(--ink2)}.mk.how::before{background:var(--ink2);width:8px;height:8px;opacity:.6}
.night .mk.how{background:rgba(255,255,255,.08);color:var(--on2)}.night .mk.example{color:var(--teal2)}
.mk-key{display:flex;gap:10px;flex-wrap:wrap;align-items:center;font-size:13px;color:var(--ash)}
.mk-key .mk{margin:0}
.card-example{border:1.5px dashed var(--line2)!important;background:linear-gradient(180deg,#fff,#f8fbfb)}
.card-course{border:1.5px solid var(--gold)!important;box-shadow:0 12px 30px rgba(214,161,63,.12)}

/* difficulty knots */
.lvl{display:inline-flex;align-items:center;gap:8px;font-size:12px;font-weight:700;color:var(--ink2)}
.lvl svg{width:78px;height:14px;flex:none}
.lvl .k{fill:#fff;stroke:var(--line2);stroke-width:1.5}.lvl .k.on{fill:var(--teal);stroke:var(--teal)}
.lvl.l4 .k.on,.lvl.l5 .k.on{fill:var(--gold);stroke:var(--gold)}
.lvl line{stroke:var(--line2);stroke-width:1.5}

/* The String (2D) */
.jstring{position:relative;width:100%}
.jstring svg{width:100%;height:auto;display:block;overflow:visible}
.jstring .st{fill:none;stroke-linecap:round}
.jstring .st.base{stroke:#bfd9de;stroke-width:3}
.jstring .st.done{stroke:url(#jsg);stroke-width:3.4}
.jstring .ring{fill:none;stroke:#5ec7d6;stroke-width:9;opacity:.9}
.jstring .ringc{fill:none;stroke:#e6f6f8;stroke-width:2}
.jstring .bead{fill:#fff;stroke:#9fc4cb;stroke-width:2;cursor:pointer;transition:r .25s}
.jstring .bead.done{fill:var(--teal);stroke:var(--teal)}
.jstring .bead.cur{fill:var(--gold);stroke:var(--gold);animation:jsp 1.6s ease-in-out infinite}
.jstring .bead.lock{fill:#eef3f4;stroke:#c9d5d8}
.jstring .bead.sel{stroke:var(--night);stroke-width:3}
.jstring .gnode{fill:var(--night);stroke:#fff;stroke-width:2}
.jstring .glab{font:700 12px var(--mono);fill:#5ec7d6}
.jstring .lab{font:600 12.5px var(--sans);fill:var(--ink2);pointer-events:none}
.jstring .lab.sm{font-size:11px;font-weight:500;fill:var(--ash)}
.jstring .future{stroke:#cfe3e7;stroke-width:2;stroke-dasharray:3 7}
.jstring .goldb{fill:var(--gold)}
@keyframes jsp{0%,100%{opacity:1}50%{opacity:.55}}
.jstring .tip{position:absolute;left:0;top:0;transform:translate(-50%,-120%);background:var(--night);color:var(--on);font-size:12.5px;padding:6px 10px;border-radius:12px;white-space:nowrap;pointer-events:none;opacity:0;transition:opacity .15s;max-width:260px;overflow:hidden;text-overflow:ellipsis;z-index:3}
.jstring .tip.on{opacity:1}
.jstring .count{position:absolute;right:0;top:0;font:600 12px var(--mono);color:var(--teal)}
/* detail card for roadmap strings */
.sdet{margin-top:14px;background:var(--night);color:var(--on);border-radius:22px;padding:18px 20px;position:relative;display:none}
.sdet.on{display:block;animation:sdin .3s ease}
@keyframes sdin{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}
.sdet .top{display:flex;align-items:center;gap:10px;margin-bottom:8px}
.sdet .wk{font:700 12px var(--mono);color:var(--teal2)}
.sdet h4{margin:0;font-size:18px;font-weight:600;color:#fff;flex:1}
.sdet .nv{display:flex;gap:6px}
.sdet .nv button{width:36px;height:36px;border-radius:50%;border:1px solid rgba(255,255,255,.2);background:rgba(255,255,255,.06);color:#fff;font-size:16px;cursor:pointer}
.sdet .nv button:hover{background:rgba(255,255,255,.14)}
.sdet dl{display:grid;grid-template-columns:auto 1fr;gap:6px 14px;margin:6px 0 0;font-size:14px}
.sdet dt{color:var(--teal2);font-size:11px;letter-spacing:.12em;text-transform:uppercase;font-weight:700;padding-top:3px}
.sdet dd{margin:0;color:var(--on)}
@media (max-width:520px){.sdet dl{grid-template-columns:1fr}.sdet dt{padding-top:6px}}

/* quiz */
.quiz{max-width:760px;margin-inline:auto}
.qcard{background:#fff;border:1px solid var(--line);border-radius:var(--r2);padding:clamp(20px,3vw,34px);box-shadow:0 20px 50px rgba(17,27,32,.06);animation:sdin .35s ease}
.qcard .qn{font:600 12px var(--mono);color:var(--teal);margin-bottom:6px}
.qcard h3{font-size:clamp(21px,2.4vw,28px);margin-bottom:6px}
.qcard .hint{color:var(--ash);font-size:14px;margin-bottom:16px}
.opts{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:10px}
.opt{display:flex;align-items:center;gap:10px;text-align:left;padding:13px 14px;border-radius:16px;border:1.5px solid var(--line2);background:#fff;font:500 15px/1.3 var(--sans);color:var(--ink);cursor:pointer;min-height:52px;transition:border-color .15s,background .15s,transform .12s}
.opt:hover{border-color:var(--teal2);transform:translateY(-1px)}
.opt .dot{width:18px;height:18px;border-radius:50%;border:2px solid var(--line2);flex:none;display:grid;place-items:center}
.opt.multi .dot{border-radius:6px}
.opt[aria-pressed=true]{border-color:var(--teal);background:var(--tint)}
.opt[aria-pressed=true] .dot{background:var(--teal);border-color:var(--teal);box-shadow:inset 0 0 0 3px #fff}
.opt.pns{border-style:dashed;color:var(--ash);font-size:14px}
.opt .ic{font-size:18px;line-height:1}
.scale{display:flex;gap:8px;flex-wrap:wrap}
.scale .opt{flex:1;min-width:92px;justify-content:center;flex-direction:column;gap:4px;text-align:center}
.qnav{display:flex;gap:10px;justify-content:space-between;align-items:center;margin-top:20px}
.chap{display:flex;align-items:center;gap:10px;margin-bottom:14px;font-size:13px;color:var(--ash)}
.chap b{color:var(--ink);font-weight:700}
.funline{font-style:italic;color:var(--teal);font-size:14px;margin-top:10px;min-height:1.3em}

/* gate panels */
.gate{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(0,1fr);gap:22px;align-items:start}
@media (max-width:900px){.gate{grid-template-columns:1fr}}
.tabs{display:flex;gap:6px;background:var(--mist);border-radius:var(--rp);padding:4px;margin-bottom:6px}
.tabs button{flex:1;border:0;background:transparent;font:600 14px var(--sans);color:var(--ink2);padding:10px 12px;border-radius:var(--rp);cursor:pointer}
.tabs button[aria-selected=true]{background:#fff;color:var(--ink);box-shadow:0 2px 8px rgba(17,27,32,.08)}
.lockline{display:flex;align-items:center;gap:10px;font-size:13px;color:var(--ash)}
.pill{display:inline-flex;align-items:center;gap:6px;font-size:12px;font-weight:600;border-radius:var(--rp);padding:4px 10px;background:var(--mist);color:var(--ink2)}
.pill.ok{background:var(--okt);color:var(--ok)}.pill.warn{background:var(--goldt);color:var(--warn)}.pill.bad{background:var(--badt);color:var(--bad)}.pill.night{background:var(--night);color:var(--on)}

/* teaser (locked) */
.locked{position:relative;overflow:hidden}
.locked .blurred{filter:blur(7px);user-select:none;pointer-events:none;opacity:.7}
.locked .veil{position:absolute;inset:0;display:grid;place-items:center;background:linear-gradient(180deg,rgba(243,246,246,.2),rgba(243,246,246,.85))}
.locked .veil span{background:var(--night);color:var(--on);font-size:13px;font-weight:600;padding:8px 14px;border-radius:var(--rp)}

/* lesson frames (blurred video) */
.lframe{position:relative;aspect-ratio:16/9;border-radius:18px;overflow:hidden;background:radial-gradient(120% 90% at 30% 20%,#5ec7d6 0%,#3b7c88 35%,#13222a 80%);isolation:isolate}
.lframe::before{content:"";position:absolute;inset:-20%;background:repeating-linear-gradient(115deg,rgba(255,255,255,.12) 0 2px,transparent 2px 18px),radial-gradient(40% 40% at 70% 60%,rgba(214,161,63,.55),transparent 70%);filter:blur(10px);animation:drift 14s linear infinite}
@keyframes drift{to{transform:translate3d(-6%,4%,0) rotate(3deg)}}
.lframe .play{position:absolute;inset:0;display:grid;place-items:center}
.lframe .play span{width:54px;height:54px;border-radius:50%;background:rgba(255,255,255,.18);backdrop-filter:blur(6px);display:grid;place-items:center;color:#fff;font-size:18px;border:1px solid rgba(255,255,255,.35)}
.lframe .cap{position:absolute;left:12px;bottom:10px;right:12px;display:flex;justify-content:space-between;gap:8px;color:#fff;font-size:12px;font-weight:600;text-shadow:0 1px 6px rgba(0,0,0,.4)}
.lframe .soon{position:absolute;top:10px;left:10px;background:rgba(17,27,32,.7);color:#fff;font-size:11px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;padding:4px 9px;border-radius:var(--rp)}

/* misc */
.bar{height:8px;border-radius:8px;background:var(--mist);overflow:hidden}.bar i{display:block;height:100%;background:linear-gradient(90deg,var(--teal),var(--teal2));border-radius:8px}
.toast{position:fixed;left:50%;bottom:calc(22px + env(safe-area-inset-bottom,0px));transform:translateX(-50%);background:var(--night);color:var(--on);padding:11px 18px;border-radius:14px;font-size:14px;z-index:99;box-shadow:0 12px 30px rgba(0,0,0,.25);max-width:calc(100vw - 32px)}
.foot{padding:34px 0 50px;color:var(--ash);font-size:13px;border-top:1px solid var(--line)}
.foot a{color:var(--ink2)}
.reveal{display:none}.reveal.on{display:block;animation:sdin .3s ease}
details.acc{border-top:1px solid var(--line);padding:12px 0}details.acc summary{cursor:pointer;font-weight:600;list-style:none;display:flex;justify-content:space-between;gap:10px}
details.acc summary::after{content:"+";color:var(--teal);font-size:20px;line-height:1}details.acc[open] summary::after{content:"–"}
details.acc summary::-webkit-details-marker{display:none}
.chip{display:inline-flex;font-size:12.5px;border:1px solid var(--line2);border-radius:var(--rp);padding:5px 11px;background:#fff;color:var(--ink2)}
.kbd{font:600 12px var(--mono);background:var(--mist);border-radius:6px;padding:2px 6px}