:root{
  --bg:#0b0c0e; --panel:#141619; --panel-2:#1b1e22; --line:#282c32;
  --ink:#e8eaed; --ink-dim:#9aa1ab; --ink-faint:#626873;
  --accent:#8ad0c6; --accent-2:#e9b872; --warn:#e08b7f; --violet:#b79cf0;
  --radius:12px; --mono:"SF Mono",ui-monospace,"JetBrains Mono",Menlo,Consolas,monospace;
  --sans:-apple-system,BlinkMacSystemFont,"Segoe UI",Inter,Roboto,sans-serif;
}
*{box-sizing:border-box}
body{background:var(--bg);color:var(--ink);font-family:var(--sans);font-size:14px;line-height:1.5;-webkit-font-smoothing:antialiased;margin:0}
em{font-style:italic}
button{font-family:var(--sans)}
/* visible keyboard focus for every control */
button:focus-visible,select:focus-visible,input:focus-visible,a:focus-visible,[tabindex]:focus-visible{
  outline:2px solid var(--accent);outline-offset:2px;border-radius:6px}
input.stag:focus-visible,.drow__name:focus-visible,.ecard__name:focus-visible,.mode__name:focus-visible,.intent__name:focus-visible{outline-offset:1px}

header.top{display:flex;align-items:baseline;gap:8px 16px;flex-wrap:wrap;padding:16px 20px;border-bottom:1px solid var(--line);position:sticky;top:0;background:rgba(11,12,14,.92);backdrop-filter:blur(8px);z-index:20}
header.top h1{font-family:var(--mono);font-size:16px;margin:0;font-weight:600}
header.top .tag{color:var(--ink-dim);font-size:12px}
header.top .header-actions{margin-left:auto;display:flex;align-items:center;gap:10px;flex-wrap:wrap}
header.top .loadsys{background:var(--panel-2);color:var(--ink-dim);border:1px solid var(--line);border-radius:8px;font-family:var(--mono);font-size:11px;padding:5px 8px;cursor:pointer}
header.top .loadsys:hover{border-color:var(--accent);color:var(--ink)}
header.top .proto{font-family:var(--mono);font-size:11px;color:var(--ink-faint);border:1px solid var(--line);padding:3px 8px;border-radius:999px;white-space:nowrap}
header.top .demobtn{background:var(--panel-2);color:var(--ink-dim);border:1px solid var(--line);border-radius:8px;font-family:var(--mono);font-size:11px;padding:5px 9px;cursor:pointer}
header.top .demobtn:hover{border-color:var(--accent);color:var(--ink)}
header.top .demolink{background:var(--accent);color:#0b0c0e;border:1px solid var(--accent);border-radius:8px;font-family:var(--mono);font-size:11px;padding:5px 10px;cursor:pointer;text-decoration:none;font-weight:600;white-space:nowrap}
header.top .demolink:hover{filter:brightness(1.08)}

/* live-demo preview overlay */
.preview{position:fixed;inset:0;z-index:50;display:flex;flex-direction:column;background:rgba(8,9,11,.72);backdrop-filter:blur(3px)}
.preview[hidden]{display:none}
.preview__bar{display:flex;align-items:center;gap:12px;padding:10px 16px;background:var(--panel);border-bottom:1px solid var(--line)}
.preview__ttl{font-family:var(--mono);font-size:12px;color:var(--ink)}
.preview__ttl .lyr{color:var(--ink-faint)}
.preview__pop{margin-left:auto;font-family:var(--mono);font-size:11px;color:var(--ink-dim);text-decoration:none;border:1px solid var(--line);border-radius:7px;padding:4px 9px}
.preview__pop:hover{border-color:var(--accent);color:var(--ink)}
.preview__x{background:transparent;border:0;color:var(--ink-faint);font-size:22px;line-height:1;cursor:pointer;padding:0 4px}
.preview__x:hover{color:var(--ink)}
.preview__frame{flex:1;width:100%;border:0;background:#0f1216}

/* orientation strip (dismissible, remembered) */
.intro{display:flex;align-items:center;gap:14px;padding:9px 20px;border-bottom:1px solid var(--line);background:var(--panel);font-size:12.5px;color:var(--ink-dim)}
.intro[hidden]{display:none}
.intro__txt{flex:1;min-width:0}
.intro strong{color:var(--ink);font-weight:600}
.intro__x{background:transparent;border:0;color:var(--ink-faint);cursor:pointer;font-size:17px;line-height:1;padding:0 4px;flex:none}
.intro__x:hover{color:var(--ink)}

.wrap{display:grid;grid-template-columns:330px minmax(0,1fr) 300px}
.col{padding:18px 20px;min-width:0}
.col.scales{border-right:1px solid var(--line)}
.col.export{border-left:1px solid var(--line);background:var(--panel)}
h2.sec{font-family:var(--mono);font-size:11px;text-transform:uppercase;letter-spacing:.12em;color:var(--ink-faint);margin:0 0 6px;font-weight:600}
h2.sec .lyr{color:var(--ink-faint);opacity:.7}
.sub{color:var(--ink-faint);font-size:11.5px;margin:0 0 12px}
.block{margin-bottom:24px}
.block__hd{display:flex;align-items:baseline;justify-content:space-between;gap:8px}
.block__toggle{display:flex;align-items:center;justify-content:space-between;gap:8px;width:100%;background:transparent;border:0;padding:0;margin:0 0 2px;cursor:pointer;text-align:left}
.block__toggle h2.sec{margin:0}
.block__toggle .block__chev{font-size:10px;color:var(--ink-faint);line-height:1}
.block__toggle:hover h2.sec,.block__toggle:hover .block__chev{color:var(--ink-dim)}
.block__toggle:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:4px}
.tempo{display:flex;align-items:center;gap:4px;font-family:var(--mono);font-size:10px;color:var(--ink-faint)}
.tempo button{background:var(--panel-2);border:1px solid var(--line);color:var(--ink-dim);border-radius:5px;width:20px;height:20px;cursor:pointer;font-size:12px;line-height:1;padding:0}
.tempo button:hover{border-color:var(--accent);color:var(--ink)}
.mode--reduced{color:var(--ink-faint);border-style:dashed}

/* ---- Layer 1: duration ladder ---- */
.ladder{display:flex;flex-direction:column;gap:7px;margin-bottom:6px}
.drow{display:flex;align-items:center;gap:9px}
.drow__name{width:56px;font-family:var(--mono);font-size:11px;color:var(--ink-dim);flex:none;background:transparent;border:0;border-bottom:1px dashed transparent;padding:1px 0;min-width:0}
.drow__name:focus{outline:none;border-bottom-color:var(--line);color:var(--ink)}
.drow__track{flex:1;min-width:0}
.drow input[type=range]{width:100%;accent-color:var(--accent);height:20px}
.drow__val{width:52px;text-align:right;font-family:var(--mono);font-size:11px;flex:none;font-variant-numeric:tabular-nums}
.drow__mult{width:36px;text-align:right;font-family:var(--mono);font-size:10px;color:var(--ink-faint);flex:none}
.drow__rm{background:transparent;border:0;color:var(--ink-faint);cursor:pointer;font-size:15px;line-height:1;padding:0 1px;flex:none}
.drow__rm:hover{color:var(--warn)}

/* ---- Layer 1: easing set ---- */
.eset{display:grid;grid-template-columns:1fr 1fr;gap:9px}
.ecard{background:var(--panel);border:1px solid var(--line);border-radius:9px;padding:9px}
.ecard__top{display:flex;align-items:center;gap:7px;margin-bottom:6px}
.ecard__plot{position:relative;width:100%;aspect-ratio:1/1;background:var(--panel-2);border:1px solid var(--line);border-radius:6px;margin:2px 0 7px;touch-action:none;overflow:hidden}
svg.bz{display:block;width:100%;height:100%}
.bz-guide{stroke:#333940;stroke-width:1.2;stroke-dasharray:4 4}
.bz-arm{stroke:var(--ink-faint);stroke-width:1.2;opacity:.55}
.bz-curve{fill:none;stroke:var(--accent);stroke-width:3.5;vector-effect:non-scaling-stroke}
.bz-h{fill:var(--accent);stroke:#04110f;stroke-width:1.5;cursor:grab}
.bz-h:hover{fill:#a6ded5}
.bz-h.drag{cursor:grabbing}
.ecard__spring{display:flex;flex-direction:column;gap:5px;margin-top:7px}
.ecard__spring label{display:flex;align-items:center;gap:7px;font-family:var(--mono);font-size:10px;color:var(--ink-faint)}
.ecard__spring label span{flex:none;width:54px}
.ecard__spring label b{flex:none;width:26px;text-align:right;color:var(--ink-dim);font-weight:600;font-variant-numeric:tabular-nums}
.ecard__spring input[type=range]{flex:1;min-width:0;accent-color:var(--accent);height:16px}
.ecard__name{flex:1;min-width:0;font-family:var(--mono);font-size:11px;color:var(--ink-dim);background:transparent;border:0;border-bottom:1px dashed transparent;padding:1px 0}
.ecard__name:focus{outline:none;border-bottom-color:var(--line);color:var(--ink)}
.ecard__rm{background:transparent;border:0;color:var(--ink-faint);cursor:pointer;font-size:14px;line-height:1;padding:0 1px;flex:none}
.ecard__rm:hover{color:var(--warn)}
.ecard select{width:100%;background:var(--panel-2);color:var(--ink);border:1px solid var(--line);border-radius:6px;padding:5px;font-family:var(--mono);font-size:10px}

/* ---- Layer 2: modes (the variant axis) ---- */
.modes{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:11px;align-items:center}
.mode{font-family:var(--mono);font-size:11px;color:var(--ink-dim);background:var(--panel);
  border:1px solid var(--line);border-radius:999px;padding:5px 11px;cursor:pointer;display:inline-flex;align-items:center;gap:6px}
.mode:hover{border-color:var(--accent);color:var(--ink)}
.mode.active{background:var(--panel-2);border-color:var(--accent);color:var(--ink);cursor:default}
.mode__name{background:transparent;border:0;color:var(--ink);font-family:var(--mono);font-size:11px;
  width:auto;min-width:44px;max-width:110px;padding:0;field-sizing:content}
.mode__name:focus{outline:none}
.mode__rm{background:transparent;border:0;color:var(--ink-faint);cursor:pointer;font-size:14px;line-height:1;padding:0}
.mode__rm:hover{color:var(--warn)}
.mode--add{color:var(--ink-faint);border-style:dashed}

/* ---- Layer 2: intents ---- */
.intent{background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:11px;margin-bottom:9px}
.intent__top{display:flex;align-items:center;gap:8px}
.intent__dot{width:9px;height:9px;border-radius:50%;flex:none;box-shadow:0 0 0 1px rgba(0,0,0,.25)}
.intent__name{font-family:var(--mono);font-weight:600;font-size:12.5px;color:var(--ink);background:transparent;border:0;border-bottom:1px dashed transparent;width:120px;padding:1px 0}
.intent__name:focus{outline:none;border-bottom-color:var(--line)}
.intent__purpose{color:var(--ink-faint);font-size:11px;margin-left:auto}
.intent__rm{background:transparent;border:0;color:var(--ink-faint);cursor:pointer;font-size:15px;line-height:1;padding:0 2px}
.intent__rm:hover{color:var(--warn)}
.intent__ref{display:flex;flex-wrap:wrap;gap:8px;margin-top:9px}
.intent__ref .field{flex:1 1 104px;min-width:0}
.intent__ref label{display:block;font-size:9.5px;text-transform:uppercase;letter-spacing:.08em;color:var(--ink-faint);margin-bottom:3px}
.intent__ref select{width:100%;background:var(--panel-2);color:var(--ink);border:1px solid var(--line);border-radius:6px;padding:6px;font-family:var(--mono);font-size:11px}
.intent__ref .field--stag{flex:none;width:76px}
.intent__ref input.stag{width:100%;background:var(--panel-2);color:var(--ink);border:1px solid var(--line);border-radius:6px;padding:6px;font-family:var(--mono);font-size:11px;font-variant-numeric:tabular-nums}
.intent__ref input.stag:focus{outline:none;border-color:var(--accent)}
.intent__adv{margin-top:8px}
.intent__adv .intent__ref{margin-top:0}
.intent__split{display:flex;align-items:center;gap:6px;margin-top:8px;font-family:var(--mono);font-size:10px;color:var(--ink-faint);cursor:pointer}
.intent__split input{accent-color:var(--accent);cursor:pointer}
.intent__foot{display:flex;align-items:center;gap:10px;margin-top:9px}
.intent__more{flex:none;background:transparent;border:1px solid var(--line);color:var(--ink-faint);border-radius:6px;font-family:var(--mono);font-size:10px;padding:3px 8px;cursor:pointer}
.intent__more:hover{border-color:var(--accent);color:var(--ink)}
.intent__resolved{flex:1;min-width:0;font-family:var(--mono);font-size:10px;color:var(--ink-faint);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.addbtn{width:100%;background:transparent;border:1px dashed var(--line);color:var(--ink-dim);border-radius:9px;padding:9px;cursor:pointer;font-size:12px}
.addbtn:hover{border-color:var(--accent);color:var(--ink)}
.addbtn--sm{padding:7px;font-size:11px;margin-top:2px}

/* ---- test bench ---- */
.toolbar{display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin:2px 0 14px}
button.btn{background:var(--accent);color:#04110f;border:0;border-radius:8px;padding:10px 16px;font-weight:600;font-size:13px;cursor:pointer}
.hint{color:var(--ink-faint);font-size:12px}
.bench{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.probe{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;position:relative;height:186px}
.probe__hd{position:absolute;top:0;left:0;right:0;z-index:6;display:flex;align-items:center;gap:6px;padding:8px 10px}
.probe__name{font-family:var(--mono);font-size:11px;color:var(--ink-faint)}
.probe__kind{background:var(--panel-2);color:var(--ink-dim);border:1px solid var(--line);border-radius:6px;font-family:var(--mono);font-size:10px;padding:3px 5px;max-width:52%}
.probe__sel{margin-left:auto;background:var(--panel-2);color:var(--ink-dim);border:1px solid var(--line);border-radius:6px;font-family:var(--mono);font-size:10px;padding:3px 5px;max-width:44%}
.probe__stage{position:absolute;inset:0;cursor:pointer}

/* abstract orb lens */
.orb-base{position:absolute;top:50%;left:14px;right:14px;height:2px;border-radius:2px;background:var(--line);transform:translateY(-50%);pointer-events:none}
.orb{position:absolute;top:50%;left:14px;width:20px;height:20px;border-radius:50%;background:var(--accent);opacity:.3;transform:translateY(-50%) scale(.5);box-shadow:0 2px 8px rgba(0,0,0,.35);pointer-events:none}

/* scope lens — everything at once: curve + playhead, plus property-driven stagger demo */
.scope{position:absolute;inset:0;padding:36px 12px 12px;display:flex;flex-direction:column;gap:8px}
.scope__graph{position:relative;flex:1;min-height:0}
.scope__curve{position:absolute;inset:0;width:100%;height:100%;overflow:hidden}
.scope__curve line{stroke:var(--ink-faint);stroke-width:1;stroke-dasharray:3 4;opacity:.4;vector-effect:non-scaling-stroke}
.scope__curve path,.scope__curve polyline{fill:none;stroke:var(--accent);stroke-width:2.5;opacity:.85;vector-effect:non-scaling-stroke}
.scope__head{position:absolute;top:0;bottom:0;width:2px;background:var(--ink-dim);left:0;opacity:0;pointer-events:none}
.scope__demo{flex:none;height:22px;display:flex;align-items:center;gap:7px}
.scope__dot{flex:1;max-width:22px;height:16px;border-radius:4px;background:var(--accent);box-shadow:0 1px 4px rgba(0,0,0,.3)}

/* cascade lens — a stagger timeline: lane k starts at k×stagger, bar width = duration */
.casc{position:absolute;inset:0;padding:40px 16px 16px}
.casc__lanes{position:relative;height:100%;display:flex;flex-direction:column;justify-content:center;gap:7px}
.casc__lane{position:relative;height:11px}
.casc__bar{position:absolute;top:0;height:100%;min-width:6px;border-radius:3px;background:rgba(255,255,255,.045);border:1px solid var(--line);overflow:hidden}
.casc__fill{position:absolute;inset:0;background:var(--accent);opacity:.92;transform:scaleX(0);transform-origin:left}
.casc__head{position:absolute;top:-6px;bottom:-6px;width:2px;background:var(--ink-dim);left:0;opacity:0;pointer-events:none}

.drawer{position:absolute;top:0;right:0;height:100%;width:60%;background:var(--panel-2);border-left:1px solid var(--line);transform:translateX(105%);padding:40px 14px 14px;display:flex;flex-direction:column;gap:7px}
.drawer .l{height:8px;border-radius:4px;background:var(--line)}
.drawer .l:nth-child(1){width:70%}.drawer .l:nth-child(2){width:90%}.drawer .l:nth-child(3){width:55%}
.scrim{position:absolute;inset:0;background:rgba(0,0,0,.45);opacity:0}
.btnpad{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);background:var(--accent);color:#04110f;font-weight:600;font-size:12px;padding:9px 18px;border-radius:8px}
.acc{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:82%;background:var(--panel-2);border:1px solid var(--line);border-radius:9px;overflow:hidden}
.acc__hd{padding:10px 12px;font-size:12px;display:flex;justify-content:space-between;align-items:center}
.acc__body{height:0;overflow:hidden;padding:0 12px;color:var(--ink-dim);font-size:11.5px}
.acc__body p{margin:0;padding:0 0 11px}
.reveal{position:absolute;top:44px;left:14px;right:14px;bottom:14px;display:flex;flex-direction:column;gap:7px}
.reveal .card{background:var(--panel-2);border:1px solid var(--line);border-radius:7px;height:26px;opacity:0;transform:translateY(14px)}

/* ---- system read ---- */
.adnote{margin-top:22px;border-top:1px solid var(--line);padding-top:14px}
.rd{display:flex;gap:8px;align-items:flex-start;font-size:12px;color:var(--ink-dim);padding:8px 0;border-bottom:1px dashed var(--line)}
.rd .ic{color:var(--accent-2);font-family:var(--mono);flex:none;width:14px}
.rd.warn .ic{color:var(--warn)} .rd.ok .ic{color:var(--accent)}

/* ---- export ---- */
.tabs{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:10px}
.tab{font-size:11px;font-family:var(--mono);padding:6px 10px;border:1px solid var(--line);border-radius:7px;color:var(--ink-dim);cursor:pointer;background:transparent}
.tab.active{color:var(--ink);border-color:var(--accent);background:var(--panel-2)}
pre.code{background:#0e1013;border:1px solid var(--line);border-radius:9px;padding:12px;font-family:var(--mono);font-size:10.5px;line-height:1.65;overflow:auto;color:#cdd3da;white-space:pre;max-height:62vh;margin:0}
.copy{margin-top:8px;width:100%;background:var(--panel-2);border:1px solid var(--line);color:var(--ink-dim);border-radius:8px;padding:10px;cursor:pointer;font-size:12px}
.tk{color:var(--accent)} .tk2{color:var(--violet)} .cm{color:var(--ink-faint)}

@media (max-width:1000px){
  .wrap{grid-template-columns:1fr}
  .col.scales{border-right:0;border-bottom:1px solid var(--line)}
  .col.export{border-left:0;border-top:1px solid var(--line)}
  header.top .tag{flex-basis:100%;order:3}
}
@media (max-width:620px){ .bench{grid-template-columns:1fr} .eset{grid-template-columns:1fr} }
@media (prefers-reduced-motion:reduce){*{scroll-behavior:auto}}