/* StudyStore "Bench Notes" design system. See design/DIRECTION.md */
:root{
  --bg:#f3f5f0;--surface:#fff;--surface-2:#e9ede6;--ink:#0d1512;--muted:#4c5853;--line:#d5dbd4;--line-2:#bfc7be;
  --grid:rgba(13,21,18,.055);--grid-strong:rgba(13,21,18,.1);
  --acid:#f2b705;--neutral:#13804a;--base:#1c5bd0;--alert:#c8323c;
  --link:#0f6b3d;--cta-bg:#0d1512;--cta-ink:#f3f5f0;--cta-hover:#f2b705;--cta-hover-ink:#0d1512;
  --paper:#fff;--shadow:0 1px 0 rgba(13,21,18,.04),0 18px 40px -18px rgba(13,21,18,.28);
  --ph:#f2b705;
  --f-display:"Bricolage Grotesque",ui-sans-serif,system-ui,sans-serif;
  --f-body:"IBM Plex Sans",ui-sans-serif,system-ui,-apple-system,"Segoe UI",sans-serif;
  --f-mono:"IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,monospace;
  --ease-out:cubic-bezier(.16,1,.3,1);--ease-io:cubic-bezier(.65,0,.35,1);
  --t-fast:160ms;--t-med:420ms;--t-slow:900ms;
  --gut:clamp(16px,4vw,40px);--max:1240px;--r:6px;
  color-scheme:light;
}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){
  --bg:#0a0f0d;--surface:#111815;--surface-2:#16201c;--ink:#e8eee9;--muted:#9aa8a1;--line:#24302b;--line-2:#34433c;
  --grid:rgba(232,238,233,.035);--grid-strong:rgba(232,238,233,.075);
  --acid:#ffd23f;--neutral:#3ddc84;--base:#6aa2ff;--alert:#ff6b72;
  --link:#58e39a;--cta-bg:#ffd23f;--cta-ink:#0a0f0d;--cta-hover:#e8eee9;--cta-hover-ink:#0a0f0d;
  --paper:#f4f6f2;--shadow:0 1px 0 rgba(0,0,0,.3),0 24px 50px -20px rgba(0,0,0,.7);color-scheme:dark;
}}
:root[data-theme="dark"]{
  --bg:#0a0f0d;--surface:#111815;--surface-2:#16201c;--ink:#e8eee9;--muted:#9aa8a1;--line:#24302b;--line-2:#34433c;
  --grid:rgba(232,238,233,.035);--grid-strong:rgba(232,238,233,.075);
  --acid:#ffd23f;--neutral:#3ddc84;--base:#6aa2ff;--alert:#ff6b72;
  --link:#58e39a;--cta-bg:#ffd23f;--cta-ink:#0a0f0d;--cta-hover:#e8eee9;--cta-hover-ink:#0a0f0d;
  --paper:#f4f6f2;--shadow:0 1px 0 rgba(0,0,0,.3),0 24px 50px -20px rgba(0,0,0,.7);color-scheme:dark;
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:84px}
html.lenis,html.lenis body{height:auto}
.lenis.lenis-smooth{scroll-behavior:auto!important}
body{margin:0;background:var(--bg);color:var(--ink);font:400 1.0625rem/1.65 var(--f-body);text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;overflow-x:clip}
h1,h2,h3,h4{font-family:var(--f-display);font-weight:650;line-height:1.02;letter-spacing:-.03em;margin:0 0 .45em;font-variation-settings:"opsz" 96}
h1{font-size:clamp(2.5rem,5.6vw,5.2rem)}
h2{font-size:clamp(2rem,4.6vw,3.6rem)}
h3{font-size:1.3rem;letter-spacing:-.015em;line-height:1.2;font-variation-settings:"opsz" 24}
p{margin:0 0 1em}
a{color:var(--link);text-underline-offset:.18em;text-decoration-thickness:1px}
a:hover{text-decoration-thickness:2px}
img{max-width:100%;height:auto;display:block}
code{font-family:var(--f-mono);font-size:.88em;background:var(--surface-2);padding:.1em .4em;border-radius:4px}
.mono{font-family:var(--f-mono)}
:focus-visible{outline:2px solid var(--base);outline-offset:3px;border-radius:3px}
::selection{background:var(--acid);color:#0d1512}
.wrap{max-width:var(--max);margin:0 auto;padding:0 var(--gut)}
.narrow{max-width:760px}
.skip{position:absolute;left:12px;top:-60px;z-index:100;background:var(--ink);color:var(--bg);padding:10px 14px;border-radius:var(--r)}
.skip:focus{top:12px}

/* graph paper background with cursor spotlight */
.gridbg{position:fixed;inset:0;z-index:-1;pointer-events:none;
  background-image:linear-gradient(var(--grid) 1px,transparent 1px),linear-gradient(90deg,var(--grid) 1px,transparent 1px),
  linear-gradient(var(--grid) 1px,transparent 1px),linear-gradient(90deg,var(--grid) 1px,transparent 1px);
  background-size:120px 120px,120px 120px,24px 24px,24px 24px;
  -webkit-mask-image:radial-gradient(600px circle at var(--mx,70%) var(--my,30%),#000 0,rgba(0,0,0,.35) 60%,rgba(0,0,0,.18) 100%);
  mask-image:radial-gradient(600px circle at var(--mx,70%) var(--my,30%),#000 0,rgba(0,0,0,.35) 60%,rgba(0,0,0,.18) 100%)}

/* header */
header.site{position:sticky;top:0;z-index:50;background:color-mix(in srgb,var(--bg) 82%,transparent);-webkit-backdrop-filter:saturate(1.4) blur(12px);backdrop-filter:saturate(1.4) blur(12px);border-bottom:1px solid var(--line)}
header.site .wrap{display:flex;align-items:center;gap:20px;height:64px}
.brand{display:flex;align-items:center;gap:10px;font-family:var(--f-display);font-weight:700;font-size:1.25rem;letter-spacing:-.03em;color:var(--ink);text-decoration:none;margin-right:auto}
.brand b{font-weight:700;color:var(--muted)}
.mark{display:inline-grid;grid-template-columns:repeat(2,9px);grid-template-rows:repeat(3,7px);gap:1px}
.mark i{width:9px;height:9px;border-radius:50%;background:var(--acid)}
.mark i:nth-child(1){grid-area:1/1}.mark i:nth-child(2){grid-area:2/2;background:var(--neutral)}.mark i:nth-child(3){grid-area:3/1;background:var(--base)}
.brand:hover .mark i{animation:hop .6s var(--ease-out)}
.brand:hover .mark i:nth-child(2){animation-delay:.06s}.brand:hover .mark i:nth-child(3){animation-delay:.12s}
@keyframes hop{40%{transform:translateY(-3px)}}
header.site nav{display:flex;gap:4px}
header.site nav a{color:var(--ink);text-decoration:none;font-size:.94rem;padding:8px 12px;border-radius:99px;position:relative}
header.site nav a:hover{background:var(--surface-2)}
.tools{display:flex;align-items:center;gap:10px}
.phread{font:500 .75rem/1 var(--f-mono);color:var(--muted);letter-spacing:.04em;display:flex;align-items:center;gap:6px;min-width:62px}
.phread::before{content:"";width:9px;height:9px;border-radius:50%;background:var(--ph);box-shadow:0 0 0 3px color-mix(in srgb,var(--ph) 25%,transparent)}
.phread b{font-weight:500;color:var(--ink)}
.themetoggle{width:36px;height:36px;display:grid;place-items:center;border-radius:50%;border:1px solid var(--line);background:var(--surface);color:var(--ink);cursor:pointer;transition:transform var(--t-med) var(--ease-out)}
.themetoggle:hover{transform:rotate(180deg)}
.phbar{position:absolute;left:0;right:0;bottom:-1px;height:2px;overflow:hidden}
.phbar i{display:block;height:100%;width:100%;transform-origin:0 50%;transform:scaleX(var(--p,0));
  background:linear-gradient(90deg,#f2b705 0%,#c9c21c 30%,#3fae5a 50%,#1f8f8a 65%,#1c5bd0 100%);background-size:100vw 100%}
@media (max-width:760px){
  header.site .wrap{height:auto;flex-wrap:wrap;padding-top:10px;padding-bottom:6px;gap:6px 12px}
  header.site nav{order:3;width:100%;margin:0 -12px;overflow-x:auto}
  header.site nav a{padding:6px 12px;font-size:.9rem}
}

/* buttons */
.btn{--bx:0px;--by:0px;position:relative;display:inline-flex;align-items:center;gap:10px;background:var(--cta-bg);color:var(--cta-ink);text-decoration:none;font:600 1rem/1 var(--f-body);padding:16px 24px;border-radius:99px;border:1px solid var(--cta-bg);cursor:pointer;overflow:hidden;isolation:isolate;
  transform:translate(var(--bx),var(--by));transition:transform var(--t-med) var(--ease-out),color var(--t-fast),border-color var(--t-fast)}
.btn::before{content:"";position:absolute;inset:0;z-index:-1;background:var(--cta-hover);border-radius:inherit;transform:translateY(101%);transition:transform var(--t-med) var(--ease-out)}
.btn:hover{color:var(--cta-hover-ink);border-color:var(--cta-hover)}
.btn:hover::before{transform:none}
.btn:hover svg{transform:translateX(3px)}
.btn svg{transition:transform var(--t-med) var(--ease-out)}
.btn:active{transform:translate(var(--bx),var(--by)) scale(.97)}
.btn.ghost{background:transparent;color:var(--ink);border-color:var(--line-2)}
.btn.ghost::before{background:var(--ink)}
.btn.ghost:hover{color:var(--bg);border-color:var(--ink)}
.btn.small{padding:11px 16px;font-size:.9rem}
.btn.off,.btn[aria-disabled=true]{background:var(--surface-2);color:var(--muted);border:1px dashed var(--line-2);cursor:not-allowed;pointer-events:none}
.btn.off::after{content:"";width:7px;height:7px;border-radius:50%;background:var(--acid);order:-1;animation:blink 1.6s infinite}
@keyframes blink{50%{opacity:.25}}
.textlink{font-weight:600;color:var(--ink);text-decoration:none;background:linear-gradient(currentColor,currentColor) 0 100%/100% 1px no-repeat;padding-bottom:2px;transition:background-size var(--t-med) var(--ease-out)}
.textlink:hover{background-size:0 1px;background-position:100% 100%}
.textlink::after{content:" \2192"}

/* shared */
.eyebrow{display:flex;align-items:center;gap:10px;font:500 .75rem/1.3 var(--f-mono);letter-spacing:.08em;text-transform:uppercase;color:var(--muted);margin:0 0 18px}
.eyebrow .dot{width:8px;height:8px;border-radius:50%;background:var(--neutral);box-shadow:0 0 0 0 var(--neutral);animation:pulse 2.4s infinite}
@keyframes pulse{0%{box-shadow:0 0 0 0 color-mix(in srgb,var(--neutral) 60%,transparent)}70%{box-shadow:0 0 0 8px transparent}100%{box-shadow:0 0 0 0 transparent}}
.lead{font-size:clamp(1.08rem,1.6vw,1.28rem);color:var(--muted);max-width:40ch;line-height:1.55}
.meta{color:var(--muted);font-size:.92rem;margin:0}
section{padding:clamp(72px,11vw,150px) 0;position:relative}
.sechead{max-width:820px;margin-bottom:clamp(36px,5vw,64px)}
.sechead.row-end{max-width:none;display:flex;justify-content:space-between;align-items:end;gap:24px;flex-wrap:wrap}
.sechead .lead{max-width:56ch}

/* split text + reveals */
.split .w{display:inline-block;overflow:hidden;vertical-align:top;padding:0 .06em .1em 0;margin:0 -.06em -.1em 0}
.split .w>span{display:inline-block;transform:translateY(105%);transition:transform var(--t-slow) var(--ease-out);transition-delay:calc(var(--i) * 40ms)}
.split.in .w>span{transform:none}
.js .reveal{opacity:0;transform:translateY(26px);transition:opacity var(--t-slow) var(--ease-out),transform var(--t-slow) var(--ease-out)}
.js .reveal.in{opacity:1;transform:none}
@supports (animation-timeline:view()){
  .js .reveal.cssd{opacity:1;transform:none;transition:none;animation:rise linear both;animation-timeline:view();animation-range:entry 0% entry 55%}
}
@keyframes rise{from{opacity:0;transform:translateY(34px)}to{opacity:1;transform:none}}

/* ---------- HERO ---------- */
section.hero{padding:clamp(40px,7vw,96px) 0 clamp(64px,8vw,120px);min-height:min(100svh,980px);display:flex;flex-direction:column;justify-content:center;overflow:hidden}
.helix{position:absolute;top:0;left:0;width:100%;height:100%;z-index:0;opacity:0;transition:opacity 1.2s var(--ease-out)}
.helix.on{opacity:1}
.helix-label{position:absolute;right:var(--gut);bottom:28px;font-size:.7rem;letter-spacing:.06em;color:var(--muted);z-index:1;text-transform:uppercase;text-align:right}
.helix-label span{display:block;transition:opacity var(--t-med)}
.helix-label .hl-b{position:absolute;right:0;bottom:0;opacity:0}
.hero.denat .hl-a{opacity:0}.hero.denat .hl-b{opacity:1}
.herogrid{position:relative;z-index:2;display:grid;grid-template-columns:minmax(0,1.15fr) minmax(0,.85fr);gap:clamp(32px,5vw,72px);align-items:center;width:100%}
.herocopy h1{margin-bottom:.32em;min-height:3.06em}
.herocopy .lead{min-height:6.2em}
.herocopy .lead{margin-bottom:32px}
.ctas{display:flex;flex-wrap:wrap;gap:12px;align-items:center}
.facts{list-style:none;padding:0;margin:44px 0 0;display:grid;grid-template-columns:repeat(4,auto);justify-content:start;gap:0;border-top:1px solid var(--line);max-width:620px}
.facts li{padding:14px 22px 0 0;margin-right:22px;font-size:.74rem;letter-spacing:.04em;text-transform:uppercase;color:var(--muted);border-right:1px solid var(--line);line-height:1.3}
.facts li:last-child{border:0}
.facts b{display:block;font:600 1.7rem/1.1 var(--f-display);letter-spacing:-.02em;color:var(--ink);text-transform:none;margin-bottom:4px}
.herostage{position:relative;perspective:1600px;max-width:430px;margin-right:auto}
.stagecap{font-size:.72rem;color:var(--muted);text-transform:uppercase;letter-spacing:.06em;margin:14px 0 0 4px}
.scrollcue{position:absolute;left:var(--gut);bottom:26px;z-index:2;display:flex;align-items:center;gap:10px;font-size:.7rem;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);text-decoration:none}
.scrollcue i{width:1px;height:36px;background:var(--line-2);position:relative;overflow:hidden}
.scrollcue i::after{content:"";position:absolute;left:0;top:-40%;width:1px;height:40%;background:var(--ink);animation:drip 1.8s var(--ease-io) infinite}
@keyframes drip{to{top:100%}}

/* Anki card demo */
.anki{position:relative;background:var(--surface);border:1px solid var(--line);border-radius:14px;box-shadow:var(--shadow);padding:14px;transform-style:preserve-3d;
  transform:rotateX(calc(3deg + var(--rx,0deg))) rotateY(calc(-7deg + var(--ry,0deg)));transition:transform .5s var(--ease-out)}
.ankibar{display:flex;justify-content:space-between;font-size:.7rem;color:var(--muted);letter-spacing:.04em;padding:2px 4px 12px;border-bottom:1px solid var(--line);margin-bottom:14px}
.ankiflip{position:relative;display:grid}
.ankicard{grid-area:1/1;display:grid;opacity:0;visibility:hidden;transform-style:preserve-3d;transition:opacity .3s,visibility .3s}
.ankicard.cur{opacity:1;visibility:visible}
.ankicard .face{grid-area:1/1;position:relative;display:flex;flex-direction:column;justify-content:center;text-align:center;backface-visibility:hidden;-webkit-backface-visibility:hidden;background:var(--paper);color:#17212b;border-radius:10px;padding:22px 22px 24px;border:1px solid #dfe4dc;transition:transform .8s var(--ease-io);min-height:360px}
.ankicard .back{transform:rotateY(180deg)}
.ankicard.flipped .front{transform:rotateY(-180deg)}
.ankicard.flipped .back{transform:rotateY(0)}
.ankicard .kind{position:absolute;left:18px;top:14px;font-size:.66rem;letter-spacing:.1em;text-transform:uppercase;color:#5d6670;margin:0}
.ankicard .opts{text-align:left}
.ankicard .q{font:500 1.18rem/1.45 var(--f-body);margin:0 0 14px;color:#0d1512}
.ankicard .a{font-size:1.02rem;margin:0 0 12px;color:#17212b}
.ankicard hr{border:0;border-top:1px solid #dfe4dc;margin:12px 0}
.ankicard img{border-radius:6px;max-height:190px;width:auto;margin:6px auto 0}
.ankicard .opts{list-style:none;padding:0;margin:0;display:grid;gap:6px}
.ankicard .opts li{border:1px solid #d6dce4;border-radius:6px;padding:8px 12px;font-size:.95rem;background:#fff}
.cloze{font-weight:700;color:#1c5bd0}
.cloze.on{background:#fff2b8;padding:0 .2em;border-radius:3px;color:#0d1512}
.ankictl{display:flex;gap:8px;justify-content:center;padding-top:14px}
.js .anki .ankicard .face{cursor:pointer}
html:not(.js) .ankicard{opacity:1;visibility:visible;position:relative}
html:not(.js) .ankicard:not(:first-child){display:none}
html:not(.js) .ankicard .back{transform:none;margin-top:12px}
html:not(.js) .ankicard{display:block}
html:not(.js) .ankictl{display:none}

/* marquee */
.marquee{border-block:1px solid var(--line);overflow:hidden;background:var(--surface);padding:0}
.marquee .track{display:flex;width:max-content;will-change:transform}
.marquee span{font-size:.82rem;letter-spacing:.06em;text-transform:uppercase;padding:18px 28px;white-space:nowrap;display:flex;align-items:center;gap:28px}
.marquee span::after{content:"";width:6px;height:6px;border-radius:50%;background:var(--acid)}
.marquee span:nth-child(3n+2)::after{background:var(--neutral)}.marquee span:nth-child(3n)::after{background:var(--base)}

/* kinetics pinned plot */
.kinetics{padding-top:clamp(56px,8vw,110px)}
.kgrid{display:grid;grid-template-columns:minmax(0,.8fr) minmax(0,1.2fr);gap:clamp(28px,5vw,80px)}
.ksteps h2{margin-bottom:8vh}
.ksteps{padding-bottom:22vh}
.kstep{min-height:62vh;padding:28px 0;border-top:1px solid var(--line);color:var(--muted);transition:color var(--t-med)}
.kstep h3{transition:color var(--t-med),transform var(--t-med) var(--ease-out);color:var(--muted)}
.kstep.on{color:var(--ink)}
.kstep.on h3{color:var(--ink);transform:translateX(8px)}
.kstep.on .kno{color:var(--alert)}
.kstep:last-child{min-height:48vh}
.kno{font-size:.75rem;color:var(--muted);margin:0 0 10px}
.kstep h3{font-size:clamp(1.5rem,2.4vw,2rem);letter-spacing:-.025em}
.kstep p{max-width:40ch}
.kstage{position:sticky;top:96px;align-self:start;height:calc(100vh - 128px);display:flex;align-items:center}
.plotbox{margin:0;width:100%;background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:clamp(12px,2vw,24px);box-shadow:var(--shadow)}
.mmplot{width:100%;height:auto;display:block;overflow:visible}
.mmplot .ax path{stroke:var(--ink);stroke-width:1.5;fill:none}
.mmplot .ticks text,.mmplot .lbl{fill:var(--muted);font-size:13px}
.mmplot .lbl.small{font-size:11px}
.mmplot .curve{fill:none;stroke-width:3.5;stroke-linecap:round}
.mmplot .curve.base{stroke:var(--base)}
.mmplot .curve.inh{stroke:var(--alert);stroke-dasharray:9 7}
.mmplot .vmax-line,.mmplot .km-v,.mmplot .km-h{stroke:var(--muted);stroke-width:1.2;stroke-dasharray:3 5;fill:none}
.mmplot .km-t{fill:var(--ink);font-weight:500}
.mmplot .vmax-t{fill:var(--ink);font-weight:500}
.mmplot .inh-t{fill:var(--alert);font-weight:500}
.mmplot .lb rect{fill:var(--surface-2);stroke:var(--line)}
.mmplot .sep{stroke:var(--line);stroke-width:1}
.mmplot .eq{fill:var(--ink);font:600 13px var(--f-mono)}
.mmplot .lbax{stroke:var(--muted);stroke-width:1;fill:none}
.mmplot .lbline{fill:none;stroke-width:2.5}
.mmplot .lbline.base{stroke:var(--base)}.mmplot .lbline.inh{stroke:var(--alert);stroke-dasharray:6 5}
.plotbox figcaption{display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px 18px;font-size:.74rem;color:var(--muted);padding:12px 4px 0;border-top:1px solid var(--line);margin-top:8px}
.legend{display:flex;align-items:center;gap:8px}
.lg{display:inline-block;width:18px;height:3px;border-radius:2px;background:var(--base)}
.lg.inh{background:repeating-linear-gradient(90deg,var(--alert) 0 5px,transparent 5px 8px);margin-left:8px}

/* quiz */
.quizsec{background:var(--surface);border-block:1px solid var(--line)}
.qgrid{display:grid;grid-template-columns:minmax(0,.85fr) minmax(0,1.15fr);gap:clamp(28px,5vw,80px);align-items:start}
.qgrid .sechead{position:sticky;top:110px}
.quizbox{border:1px solid var(--line);border-radius:14px;background:var(--bg);padding:clamp(18px,3vw,36px);box-shadow:var(--shadow)}
.qhead{display:flex;justify-content:space-between;align-items:center;font-size:.75rem;color:var(--muted);margin-bottom:22px;letter-spacing:.04em}
.qprog{display:flex;gap:6px}
.qprog i{width:28px;height:6px;border-radius:3px;background:var(--line);transition:background var(--t-med)}
.qprog i.ok{background:var(--neutral)}.qprog i.no{background:var(--alert)}.qprog i.cur{background:var(--ink)}
.qitem{display:none}
.qitem.cur{display:block;animation:qin .55s var(--ease-out)}
html:not(.js) .qitem{display:block;margin-bottom:28px}
@keyframes qin{from{opacity:0;transform:translateX(24px)}}
.qtext{font:600 clamp(1.25rem,2.4vw,1.7rem)/1.3 var(--f-display);letter-spacing:-.02em;margin-bottom:22px}
.qn{display:block;font-size:.72rem;font-weight:500;color:var(--muted);letter-spacing:.06em;margin-bottom:8px}
.qopts{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.qopts button{display:flex;align-items:center;gap:14px;text-align:left;font:500 1rem/1.3 var(--f-body);color:var(--ink);background:var(--surface);border:1px solid var(--line-2);border-radius:10px;padding:14px 16px;cursor:pointer;transition:border-color var(--t-fast),transform var(--t-fast) var(--ease-out),background var(--t-fast)}
.qopts button b{font:500 .8rem/1 var(--f-mono);width:28px;height:28px;flex:none;display:grid;place-items:center;border-radius:50%;border:1px solid var(--line-2)}
.qopts button:hover:not(:disabled){border-color:var(--ink);transform:translateY(-2px)}
.qopts button:disabled{cursor:default}
.qopts button.right{border-color:var(--neutral);background:color-mix(in srgb,var(--neutral) 12%,var(--surface))}
.qopts button.right b{background:var(--neutral);border-color:var(--neutral);color:#fff}
.qopts button.wrong{border-color:var(--alert);background:color-mix(in srgb,var(--alert) 10%,var(--surface));animation:shake .4s}
.qopts button.wrong b{background:var(--alert);border-color:var(--alert);color:#fff}
@keyframes shake{25%{transform:translateX(-5px)}75%{transform:translateX(5px)}}
.js .qexp{display:none}
.qexp{margin:18px 0 0;padding:14px 16px;border-left:3px solid var(--neutral);background:var(--surface);border-radius:0 8px 8px 0}
.qitem.done .qexp{display:block;animation:qin .45s var(--ease-out)}
.qnext{margin-top:18px}
.qdone{display:none;text-align:left}
.qdone.cur{display:block;animation:qin .55s var(--ease-out)}
.qfinal{font:600 clamp(1.4rem,3vw,2.2rem)/1.2 var(--f-display);letter-spacing:-.02em}

/* pack assembly */
.igrid{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:clamp(28px,6vw,96px);align-items:start}
.inside .igrid{min-height:190vh}
.icopy{position:sticky;top:110px}
.istage{position:sticky;top:96px;height:calc(100vh - 140px);min-height:460px;display:grid;place-items:center}
.files{list-style:none;padding:0;margin:28px 0;border-top:1px solid var(--line)}
.files li{display:grid;grid-template-columns:150px 1fr;gap:14px;padding:14px 0;border-bottom:1px solid var(--line);font-size:.84rem;color:var(--muted)}
.files b{color:var(--ink);font-weight:500}
.mixlabel{font-size:.72rem;letter-spacing:.06em;text-transform:uppercase;color:var(--muted);margin-bottom:10px}
.mixbar{display:flex;height:14px;border-radius:7px;overflow:hidden;gap:3px}
.mixbar i{flex:var(--w);transform-origin:0 50%;transform:scaleX(var(--mx,1));transition:transform 1.2s var(--ease-out)}
.m1{background:var(--base)}.m2{background:var(--neutral)}.m3{background:var(--acid)}.m4{background:var(--alert)}
.mixkey{list-style:none;padding:0;margin:12px 0 0;display:flex;flex-wrap:wrap;gap:6px 18px;font-size:.76rem;color:var(--muted)}
.mixkey i{display:inline-block;width:9px;height:9px;border-radius:2px;margin-right:6px;vertical-align:0}
.pack{position:relative;width:min(420px,80%);aspect-ratio:4/5;--p:1}
.part{position:absolute;border-radius:10px;box-shadow:var(--shadow);will-change:transform}
.p-sheet{inset:0 12% 10% 0;background:#fff;overflow:hidden;border:1px solid #dfe4dc;
  transform:translate(calc((1 - var(--p)) * -60%),calc((1 - var(--p)) * -18%)) rotate(calc(-4deg - (1 - var(--p)) * 14deg))}
.p-sheet{z-index:1}.p-deck{z-index:2}.p-readme{z-index:3}.packlabel{z-index:4}
.p-sheet img{width:100%;height:auto}
.tag{position:absolute;left:10px;bottom:10px;font-size:.68rem;background:#0d1512;color:#fff;padding:4px 8px;border-radius:4px}
.p-deck{right:0;top:22%;width:62%;aspect-ratio:1.25;transform:translate(calc((1 - var(--p)) * 70%),calc((1 - var(--p)) * -40%)) rotate(calc(5deg + (1 - var(--p)) * 18deg))}
.mini{position:absolute;inset:0;border-radius:10px;background:#fff;border:1px solid #dfe4dc}
.mini.c3{transform:translate(10px,10px) rotate(4deg);background:#eef1ec}.mini.c2{transform:translate(5px,5px) rotate(2deg);background:#f6f8f4}
.mini.c1{padding:16px;display:flex;flex-direction:column;gap:10px;color:#0d1512}
.mini.c1 span{font-size:.66rem;color:#5d6670;text-transform:uppercase;letter-spacing:.08em}
.mini.c1 b{font:600 1.4rem/1.1 var(--f-display);letter-spacing:-.02em}
.p-readme{left:6%;bottom:0;width:48%;padding:14px 14px 40px;background:var(--ink);color:var(--bg);font-size:.72rem;display:flex;flex-direction:column;gap:4px;
  transform:translate(calc((1 - var(--p)) * -40%),calc((1 - var(--p)) * 80%)) rotate(calc(-2deg + (1 - var(--p)) * -22deg))}
.p-readme .tag{background:var(--acid);color:#0d1512;bottom:auto;top:auto;position:static;align-self:flex-start;margin-bottom:6px}
.packlabel{position:absolute;right:-4%;bottom:-6%;display:flex;flex-direction:column;align-items:center;justify-content:center;width:96px;height:96px;border-radius:50%;background:var(--acid);color:#0d1512;font-size:.66rem;text-transform:uppercase;letter-spacing:.08em;
  transform:scale(var(--p)) rotate(calc((1 - var(--p)) * -90deg));box-shadow:var(--shadow)}
.packlabel b{font:700 1.6rem/1 var(--f-display);letter-spacing:-.03em;text-transform:none}

/* cheat sheet loupe */
.sgrid{display:grid;grid-template-columns:minmax(0,.9fr) minmax(0,1.1fr);gap:clamp(28px,6vw,96px);align-items:center}
.hint{font-size:.74rem;color:var(--muted);text-transform:uppercase;letter-spacing:.06em}
.loupe{position:relative;margin:0;background:#fff;border:1px solid var(--line);border-radius:10px;padding:10px;box-shadow:var(--shadow);cursor:zoom-in;transform:rotate(1.5deg);transition:transform var(--t-slow) var(--ease-out)}
.loupe:hover{transform:none}
.loupe img{width:100%;border-radius:4px}
.loupe figcaption{font-size:.72rem;color:#5d6670;padding:10px 4px 2px}
.lens{position:absolute;width:210px;height:210px;border-radius:50%;pointer-events:none;opacity:0;transform:translate(-50%,-50%) scale(.6);transition:opacity var(--t-fast),transform var(--t-med) var(--ease-out);
  border:2px solid #0d1512;box-shadow:0 0 0 6px rgba(255,255,255,.7),0 20px 40px -10px rgba(0,0,0,.45);background-repeat:no-repeat;background-color:#fff;left:0;top:0}
.loupe.zoom .lens{opacity:1;transform:translate(-50%,-50%) scale(1)}

/* packs + pricing */
.pgrid{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(0,.85fr);gap:20px}
.pcard{position:relative;background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:clamp(22px,3vw,40px);overflow:hidden}
.pcard.main{border-color:var(--ink);box-shadow:var(--shadow)}
.pcard.main::before{content:"";position:absolute;inset:0 0 auto 0;height:4px;background:linear-gradient(90deg,#f2b705,#3fae5a,#1c5bd0)}
.pcardtop{display:flex;justify-content:space-between;gap:12px;font-size:.72rem;color:var(--muted);text-transform:uppercase;letter-spacing:.06em;margin-bottom:22px}
.pcard h3{font-size:clamp(1.5rem,2.6vw,2.2rem);letter-spacing:-.03em;line-height:1.05;max-width:18ch}
.pprice{display:flex;flex-wrap:wrap;align-items:baseline;gap:6px 12px;margin:18px 0 22px}
.pprice .amt{font:700 clamp(3rem,6vw,4.6rem)/1 var(--f-display);letter-spacing:-.04em}
.pprice .mono{font-size:.76rem;color:var(--muted);text-transform:uppercase;letter-spacing:.05em}
ul.ticks{list-style:none;padding:0;margin:0 0 28px}
ul.ticks li{position:relative;padding:10px 0 10px 30px;border-top:1px solid var(--line)}
ul.ticks li::before{content:"";position:absolute;left:2px;top:17px;width:12px;height:7px;border-left:2px solid var(--neutral);border-bottom:2px solid var(--neutral);transform:rotate(-45deg)}
.row{display:flex;gap:20px;align-items:center;flex-wrap:wrap}
.soonpill{background:var(--acid);color:#0d1512;padding:3px 9px;border-radius:99px}
.fan{list-style:none;padding:0;margin:22px 0 0;position:relative}
.fan li{display:flex;gap:14px;align-items:baseline;font-size:.8rem;padding:11px 14px;margin-top:-1px;border:1px solid var(--line-2);background:var(--bg);border-radius:6px;
  transform:translateX(calc(var(--k) * 6px));transition:transform var(--t-med) var(--ease-out),background var(--t-fast)}
.fan li b{font-weight:500;color:var(--muted)}
.fan li:nth-child(1){--k:0}.fan li:nth-child(2){--k:1}.fan li:nth-child(3){--k:2}.fan li:nth-child(4){--k:3}.fan li:nth-child(5){--k:4}
.sampler:hover .fan li{transform:none}
.fan li:hover{background:var(--acid);color:#0d1512}.fan li:hover b{color:#0d1512}
.promises{list-style:none;padding:0;margin:28px 0 0;display:flex;flex-wrap:wrap;gap:10px 28px;font-size:.76rem;color:var(--muted);text-transform:uppercase;letter-spacing:.05em}
.promises li::before{content:"+ ";color:var(--neutral)}

.amt.long,.buybox .price.long{font-size:clamp(1.6rem,3vw,2.2rem)!important;letter-spacing:-.02em!important;line-height:1.1!important}
.minilb{display:block;width:100%;max-width:300px;height:auto;margin:8px auto 0}

/* notes grid */
.notegrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:20px}
.notecard{background:var(--surface);border:1px solid var(--line);border-radius:12px;overflow:hidden;transition:transform var(--t-med) var(--ease-out),border-color var(--t-fast),box-shadow var(--t-med)}
.notecard:hover{transform:translateY(-4px);border-color:var(--line-2);box-shadow:var(--shadow)}
.notecard>a{display:block;overflow:hidden;background:#fff;aspect-ratio:1200/630;border-bottom:1px solid var(--line)}
.notecard img{width:100%;height:100%;object-fit:cover;object-position:50% 30%;transition:transform var(--t-slow) var(--ease-out)}
.notecard:hover img{transform:scale(1.04)}
.notecard>div{padding:18px 20px 22px}
.notecard h3{font-size:1.15rem;margin:0 0 .5em}
.notecard h3 a{color:var(--ink);text-decoration:none}
.notecard h3 a::after{content:" \2192";opacity:0;transition:opacity var(--t-fast)}
.notecard:hover h3 a::after{opacity:1}
.notecard .meta{font-size:.88rem}

/* FAQ */
.faqsec{border-top:1px solid var(--line)}
.fgrid2{display:grid;grid-template-columns:minmax(0,.8fr) minmax(0,1.2fr);gap:clamp(24px,5vw,80px)}
.faq details,.quiz details{border-bottom:1px solid var(--line)}
.faq details:first-child{border-top:1px solid var(--line)}
.faq summary,.quiz summary{list-style:none;cursor:pointer;font:600 1.12rem/1.35 var(--f-body);padding:22px 44px 22px 0;position:relative}
.faq summary::-webkit-details-marker,.quiz summary::-webkit-details-marker{display:none}
.faq summary::after,.quiz summary::after{content:"";position:absolute;right:6px;top:50%;width:14px;height:14px;margin-top:-7px;
  background:linear-gradient(currentColor,currentColor) center/14px 2px no-repeat,linear-gradient(currentColor,currentColor) center/2px 14px no-repeat;transition:transform var(--t-med) var(--ease-out)}
.faq details[open] summary::after,.quiz details[open] summary::after{transform:rotate(135deg)}
.faq summary:hover,.quiz summary:hover{color:var(--link)}
.faq details>div{overflow:hidden}
.faq details p{color:var(--muted);margin:0 0 22px;max-width:62ch}

/* finale */
.finale{border-top:1px solid var(--line);overflow:hidden}
.finale h2.big{font-size:clamp(3rem,11vw,10rem);letter-spacing:-.05em;line-height:.92;margin-bottom:.35em}

.fin{display:grid;grid-template-columns:minmax(0,1.1fr) minmax(0,.9fr);gap:40px;align-items:end}
.titrfig{margin:0}
.titr{width:100%;height:auto;overflow:visible}
.titr .tax{fill:none;stroke:var(--line-2);stroke-width:1.2}
.titr .tline{fill:none;stroke:url(#ind);stroke-width:5;stroke-linecap:round;stroke-dasharray:1;stroke-dashoffset:var(--draw,0)}
.titr .tl{fill:var(--muted);font:12px var(--f-mono)}
.titrfig figcaption{font-size:.72rem;color:var(--muted);margin-top:8px}
.js .titr .tline{--draw:1;transition:stroke-dashoffset 2.2s var(--ease-io)}
.js .titrfig.in .tline{--draw:0}
@media (max-width:980px){.fin{grid-template-columns:1fr}}

/* footer */
footer.site{border-top:1px solid var(--line);padding:56px 0 0;color:var(--muted);font-size:.9rem;background:var(--surface);overflow:hidden}
.fgrid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:24px;margin-bottom:32px}
.flabel{font:500 .72rem/1 var(--f-mono);letter-spacing:.08em;text-transform:uppercase;color:var(--ink);margin-bottom:14px}
footer.site .links{display:flex;flex-direction:column;gap:6px}
footer.site a{color:var(--muted)}
footer.site a:hover{color:var(--ink)}
.wordmark{font:800 clamp(4rem,19vw,17rem)/.8 var(--f-display);letter-spacing:-.06em;color:var(--ink);margin:40px 0 0;white-space:nowrap;transform:translateY(14%)}
.wordmark b{color:transparent;-webkit-text-stroke:1.5px var(--ink)}

/* ---------- generic page heads (notes index, legal, product) ---------- */
div.hero{padding-top:clamp(48px,8vw,110px)}
div.hero h1{max-width:16ch}
.legal{padding-top:clamp(48px,7vw,96px)!important;padding-bottom:clamp(56px,8vw,120px)!important}
.legal h1{font-size:clamp(2.4rem,6vw,4.4rem)}
.legal>p:first-of-type{font-family:var(--f-mono);font-size:.78rem;text-transform:uppercase;letter-spacing:.06em;color:var(--muted)}
.legal h2{font-size:1.3rem;letter-spacing:-.015em;margin-top:2em;padding-top:1.2em;border-top:1px solid var(--line)}
.legal p{max-width:66ch}
section.notelist{padding-top:24px}

/* ---------- notes article ---------- */
.note{padding-top:clamp(40px,6vw,80px);padding-bottom:clamp(56px,8vw,110px)}
.note h1{font-size:clamp(2.2rem,5.4vw,4rem);max-width:18ch}
.note>.meta{font-family:var(--f-mono);font-size:.76rem;letter-spacing:.03em;text-transform:uppercase;padding-bottom:28px;border-bottom:1px solid var(--line);margin-bottom:36px}
.prose{font-size:1.08rem}
.prose h2{font-size:clamp(1.6rem,3vw,2.2rem);margin-top:1.8em}
.prose h3{margin-top:1.5em}
.prose p,.prose li{max-width:68ch}
.prose li{margin:.3em 0}
.prose strong{font-weight:600}
.prose figure{margin:2em 0;background:#fff;border:1px solid var(--line);border-radius:10px;padding:12px}
.prose figure img{margin:0 auto}
.prose figcaption{font-family:var(--f-mono);font-size:.76rem;color:#5d6670;padding-top:10px}
.prose blockquote{margin:1.6em 0;padding:16px 20px;border-left:3px solid var(--acid);background:var(--surface);border-radius:0 10px 10px 0}
.prose blockquote p{margin:.4em 0}
.tablewrap{overflow-x:auto;margin:1.6em 0;border:1px solid var(--line);border-radius:10px;background:var(--surface)}
table{border-collapse:collapse;width:100%;font-size:.95rem}
td,th{border-bottom:1px solid var(--line);padding:10px 14px;text-align:left;vertical-align:top}
th{font-family:var(--f-mono);font-weight:500;font-size:.74rem;text-transform:uppercase;letter-spacing:.05em;color:var(--muted);background:var(--surface-2)}
tr:last-child td{border-bottom:0}
.note h2#quiz,.note>h2{font-size:clamp(1.6rem,3vw,2.2rem);margin-top:1.8em}
.quiz{border-top:1px solid var(--line);margin-bottom:2em}
.quiz summary{font-size:1.04rem}
.quiz details.q>div{padding:0 0 18px;color:var(--muted)}
.quiz details.q>div p{margin:.4em 0}
.note>ul{padding-left:1.2em}
.note>ul li{margin:.35em 0}
.cta{display:flex;gap:20px;align-items:center;justify-content:space-between;flex-wrap:wrap;background:var(--ink);color:var(--bg);border-radius:14px;padding:24px 28px;margin:2.4em 0;position:relative;overflow:hidden}
.cta::before{content:"";position:absolute;inset:0 0 auto 0;height:3px;background:linear-gradient(90deg,#f2b705,#3fae5a,#1c5bd0)}
.cta strong{font:600 1.25rem/1.2 var(--f-display);letter-spacing:-.02em}
.cta p{margin:.4em 0 0;color:color-mix(in srgb,var(--bg) 72%,var(--ink));font-size:.95rem;max-width:56ch}
.cta a:not(.btn){color:var(--bg)}
.cta .btn{background:var(--acid);border-color:var(--acid);color:#0d1512}
.cta .btn::before{background:var(--bg)}
.cta .btn.off{background:transparent;color:var(--bg);border-color:color-mix(in srgb,var(--bg) 40%,transparent)}

/* ---------- product page ---------- */
.phero{padding-top:clamp(40px,7vw,100px);padding-bottom:clamp(40px,6vw,80px)}
.phero h1{font-size:clamp(2.4rem,6.4vw,5.6rem);max-width:15ch}
.pmain{display:grid;grid-template-columns:minmax(0,1.5fr) minmax(300px,.8fr);gap:clamp(28px,5vw,80px);align-items:start;padding-bottom:clamp(56px,8vw,110px)}
.pbody h2{font-size:clamp(1.6rem,3vw,2.4rem);margin-top:1.6em;padding-top:1em;border-top:1px solid var(--line)}
.pbody h2:first-child{margin-top:0;padding-top:0;border:0}
.pbody>p{max-width:62ch}
.buybox{position:sticky;top:96px;background:var(--surface);border:1px solid var(--ink);border-radius:14px;padding:28px;box-shadow:var(--shadow);overflow:hidden}
.buybox::before{content:"";position:absolute;inset:0 0 auto 0;height:4px;background:linear-gradient(90deg,#f2b705,#3fae5a,#1c5bd0)}
.buybox .price{font:700 4.4rem/1 var(--f-display);letter-spacing:-.04em;margin:6px 0 10px}
.buybox .btn{width:100%;justify-content:center}
.buybox ul{list-style:none;padding:0;margin:18px 0;font-size:.9rem}
.buybox ul li{padding:8px 0;border-top:1px solid var(--line);display:flex;justify-content:space-between;gap:10px}
.buybox ul li span:first-child{color:var(--muted)}
.elements{list-style:none;padding:0;margin:20px 0;display:grid;grid-template-columns:repeat(auto-fill,minmax(112px,1fr));gap:8px}
.elements li{position:relative;aspect-ratio:1;border:1px solid var(--line-2);border-radius:6px;padding:10px;display:flex;flex-direction:column;justify-content:space-between;background:var(--surface);transition:transform var(--t-med) var(--ease-out),background var(--t-fast),color var(--t-fast)}
.elements li:hover{transform:translateY(-4px) rotate(-1deg);background:var(--ink);color:var(--bg)}
.elements .z{font:500 .66rem/1 var(--f-mono);color:var(--muted)}
.elements li:hover .z{color:inherit}
.elements .sym{font:700 2rem/1 var(--f-display);letter-spacing:-.03em}
.elements .nm{font-size:.72rem;line-height:1.2}
.elements li.k1 .sym{color:var(--base)}.elements li.k2 .sym{color:var(--neutral)}.elements li.k3 .sym{color:var(--alert)}
.elements li:hover .sym{color:var(--acid)}
.steps{list-style:none;padding:0;margin:20px 0;counter-reset:s}
.steps li{counter-increment:s;position:relative;padding:14px 0 14px 56px;border-top:1px solid var(--line)}
.steps li::before{content:counter(s,decimal-leading-zero);position:absolute;left:0;top:14px;font:500 .8rem/1.6 var(--f-mono);color:var(--muted)}
.gallery{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr) minmax(0,1.3fr);gap:20px;align-items:start}
.gallery .sheets{display:grid;gap:20px}
.gallery figure{margin:0}
.gallery button{display:block;width:100%;padding:8px;background:#fff;border:1px solid var(--line);border-radius:10px;cursor:zoom-in;transition:transform var(--t-med) var(--ease-out),box-shadow var(--t-med)}
.gallery button:hover{transform:translateY(-6px) rotate(-.6deg);box-shadow:var(--shadow)}
.gallery img{width:100%;border-radius:4px}
.gallery figcaption{font-family:var(--f-mono);font-size:.72rem;color:var(--muted);padding-top:10px;text-transform:uppercase;letter-spacing:.04em}
dialog.lightbox{border:0;padding:0;background:transparent;max-width:min(92vw,900px);max-height:92vh}
dialog.lightbox::backdrop{background:rgba(6,10,8,.82);-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px)}
dialog.lightbox img{max-height:86vh;width:auto;border-radius:8px;background:#fff}
dialog.lightbox button{position:absolute;top:8px;right:8px;width:40px;height:40px;border-radius:50%;border:0;background:#0d1512;color:#fff;font-size:1.3rem;cursor:pointer}
.pbottom{border-top:1px solid var(--line)}

/* ---------- responsive ---------- */
@media (max-width:980px){
  .herogrid{grid-template-columns:1fr}
  .helix{width:100%;opacity:0}
  .helix.on{opacity:.3}
  .herostage{max-width:520px}
  .kgrid{grid-template-columns:1fr}
  .kstage{position:sticky;top:64px;height:auto;z-index:3;order:-1;margin:0 calc(var(--gut) * -1);padding:0 var(--gut) 8px;background:linear-gradient(var(--bg) 85%,transparent)}
  .ksteps h2{margin-bottom:4vh}
  .ksteps{padding-bottom:0}
  .kstep{min-height:48vh}
  .igrid,.sgrid,.fgrid2,.pgrid,.qgrid{grid-template-columns:1fr}
  .qgrid .sechead{position:static}
  .inside .igrid{min-height:0}
  .icopy{position:static}
  .istage{position:relative;top:0;height:min(110vw,560px);min-height:0}
  .pmain{grid-template-columns:1fr}
  .buybox{position:relative;top:0}
  .gallery{grid-template-columns:repeat(2,minmax(0,1fr))}
  .gallery .sheets{grid-column:1/-1;grid-template-columns:1fr 1fr}
}
@media (max-width:760px){
  body{font-size:1rem}
  .gallery .sheets{grid-template-columns:1fr}
  section.hero{min-height:0;padding-top:28px}
  .herocopy .lead{min-height:7.75em}
  .facts{grid-template-columns:repeat(2,1fr);row-gap:14px}
  .facts li{border-right:0}
  .facts li:nth-child(odd){border-right:1px solid var(--line)}
  .qopts{grid-template-columns:1fr}
  .files li{grid-template-columns:1fr;gap:2px}
  .fgrid{grid-template-columns:1fr 1fr}
  .fgrid>div:first-child{grid-column:1/-1}
  .scrollcue,.helix-label{display:none}
  .kstage .plotbox{padding:8px}
  .kstage .plotbox figcaption{display:none}
  .ankicard .face{min-height:300px;padding:18px}
  .lens{width:150px;height:150px}
  .phread{display:none}
  .kstage{top:96px}
  .anki{transform:none}
}

/* ---------- reduced motion: everything readable, final states ---------- */
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.001ms!important;animation-iteration-count:1!important;transition-duration:.001ms!important;scroll-behavior:auto!important}
  .js .reveal,.js .reveal.cssd{opacity:1;transform:none;animation:none}
  .split .w>span{transform:none}
  .kstep{opacity:1;min-height:0;padding:22px 0}
  .inside .igrid{min-height:0}
  .pack{--p:1!important}
  .marquee .track{flex-wrap:wrap;width:auto;justify-content:center}
  .marquee .track span[aria-hidden]{display:none}
  .kstage{position:relative;top:0}
  .istage,.icopy{position:relative;top:0}
}

/* print */
@media print{header.site,footer.site .wordmark,.gridbg,.helix,.marquee,.scrollcue{display:none}body{background:#fff}}