/* ProfStack · narrated lecture system
   Layout: sticky control bar, scene list on the left, one scene at a time on a text|diagram split
   whose proportions the Layout switch changes (Text / Even / Diagram). */
:root{
  --bg:#F3F5F8; --surface:#FFFFFF; --sunk:#E9EDF2; --ink:#16202B; --muted:#5A6675; --line:#D6DDE5;
  --mark:rgba(255,205,40,.38); --good:#1E7F4F; --bad:#B4362F; --warn:#A86200;
  --wk:#2F5BD3; --wk-soft:rgba(47,91,211,.10); --on-wk:#FFFFFF;
  --f-display:"Schibsted Grotesk","Helvetica Neue",Arial,sans-serif;
  --f-body:"Source Serif 4",Georgia,"Times New Roman",serif;
  --f-mono:"JetBrains Mono",ui-monospace,Menlo,Consolas,monospace;
  --r:10px;
}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]){
  --bg:#0E1318; --surface:#161D25; --sunk:#1D2630; --ink:#E5EAF0; --muted:#97A3B1; --line:#2B3642;
  --mark:rgba(255,205,40,.20); --good:#5BCB8E; --bad:#F0837A; --warn:#F0B048;
  --wk:var(--wk-d,#7C9BFF); --wk-soft:var(--wk-soft-d,rgba(124,155,255,.14)); --on-wk:#0E1318; color-scheme:dark}}
:root[data-theme="dark"]{
  --bg:#0E1318; --surface:#161D25; --sunk:#1D2630; --ink:#E5EAF0; --muted:#97A3B1; --line:#2B3642;
  --mark:rgba(255,205,40,.20); --good:#5BCB8E; --bad:#F0837A; --warn:#F0B048;
  --wk:var(--wk-d,#7C9BFF); --wk-soft:var(--wk-soft-d,rgba(124,155,255,.14)); --on-wk:#0E1318; color-scheme:dark}

*{box-sizing:border-box}
html,body{background:var(--bg);color:var(--ink)}
body{margin:0;font:17px/1.6 var(--f-body);-webkit-font-smoothing:antialiased}
a{color:var(--wk)}
button{font:inherit;color:inherit}
:focus-visible{outline:2px solid var(--wk);outline-offset:2px}
h1,h2,h3,h4{font-family:var(--f-display);line-height:1.15;text-wrap:balance;margin:0}
.mono{font-family:var(--f-mono);font-size:.78rem;letter-spacing:.04em}
.eyebrow{font-family:var(--f-mono);font-size:.72rem;letter-spacing:.09em;text-transform:uppercase;color:var(--muted)}

/* ---------- top bar ---------- */
.bar{position:sticky;top:env(safe-area-inset-top,0px);z-index:20;background:color-mix(in srgb,var(--bg) 88%,transparent);
  backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.bar-in{display:flex;flex-wrap:wrap;align-items:center;gap:10px 18px;padding:10px 20px;max-width:1440px;margin:0 auto}
.brand{display:flex;align-items:baseline;gap:10px;min-width:0;flex:1 1 260px;text-decoration:none;color:var(--ink)}
.brand b{font-family:var(--f-display);font-weight:800;font-size:1.02rem;white-space:nowrap}
.brand span{font-family:var(--f-display);color:var(--muted);font-size:.92rem;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.controls{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.seg{display:inline-flex;border:1px solid var(--line);border-radius:999px;padding:2px;background:var(--surface)}
.seg button{border:0;background:none;padding:5px 12px;border-radius:999px;cursor:pointer;font-family:var(--f-display);font-size:.84rem;color:var(--muted)}
.seg button[aria-pressed="true"]{background:var(--ink);color:var(--bg)}
.seg-label{font-family:var(--f-mono);font-size:.68rem;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);margin-right:2px}
.pill{border:1px solid var(--line);background:var(--surface);border-radius:999px;padding:5px 13px;cursor:pointer;font-family:var(--f-display);font-size:.84rem;display:inline-flex;align-items:center;gap:6px}
.pill[aria-pressed="true"]{border-color:var(--wk);color:var(--wk);background:var(--wk-soft)}
.pill.listen{background:var(--wk);border-color:var(--wk);color:var(--on-wk);font-weight:600}
.pill.listen[aria-pressed="true"]{background:var(--ink);border-color:var(--ink);color:var(--bg)}

/* ---------- shell ---------- */
.shell{display:grid;grid-template-columns:260px minmax(0,1fr);gap:28px;max-width:1440px;margin:0 auto;padding:22px 20px 40px}
.toc{position:sticky;top:calc(env(safe-area-inset-top,0px) + 74px);align-self:start;max-height:calc(100vh - 100px);overflow:auto}
.toc h1{font-size:1.35rem;margin:4px 0 6px}
.toc .meta{font-size:.86rem;color:var(--muted);margin-bottom:14px;font-family:var(--f-display)}
.toc ol{list-style:none;margin:0;padding:0;display:grid;gap:2px;counter-reset:s}
.toc li button{width:100%;text-align:left;border:0;background:none;padding:7px 10px;border-radius:8px;cursor:pointer;display:grid;grid-template-columns:26px 1fr;gap:6px;align-items:baseline;font-family:var(--f-display);font-size:.9rem;color:var(--muted)}
.toc li button .n{font-family:var(--f-mono);font-size:.72rem}
.toc li button:hover{background:var(--sunk);color:var(--ink)}
.toc li button[aria-current="true"]{background:var(--wk-soft);color:var(--ink);font-weight:600}
.toc li button[aria-current="true"] .n{color:var(--wk)}
.toc .kind{display:inline-block;font-family:var(--f-mono);font-size:.62rem;letter-spacing:.08em;text-transform:uppercase;border:1px solid currentColor;border-radius:4px;padding:0 4px;margin-left:6px;vertical-align:1px;opacity:.75}
.toc li.seen .n::after{content:" ✓";color:var(--good)}

/* ---------- stage ---------- */
.stage{min-width:0}
.scene-head{display:flex;flex-wrap:wrap;justify-content:space-between;align-items:end;gap:8px 20px;margin-bottom:16px}
.scene-head h2{font-size:clamp(1.6rem,3.2vw,2.5rem);font-weight:800;letter-spacing:-.015em;max-width:24ch}
.chips{display:flex;flex-wrap:wrap;gap:6px}
.chip{font-family:var(--f-mono);font-size:.7rem;letter-spacing:.06em;text-transform:uppercase;border:1px solid var(--line);border-radius:999px;padding:3px 9px;color:var(--muted);background:var(--surface)}
.chip.k-activity{border-color:var(--wk);color:var(--wk)}
.chip.k-check{border-color:var(--good);color:var(--good)}
.chip.k-exam{border-color:var(--exam);color:var(--exam)}

.split{display:grid;gap:26px;grid-template-columns:minmax(0,1fr) minmax(0,1fr);align-items:start}
body[data-layout="text"] .split{grid-template-columns:minmax(0,1fr)}
body[data-layout="text"] .split .fig{display:none}
body[data-layout="text"] .narr{max-width:68ch}
body[data-layout="diagram"] .split{grid-template-columns:minmax(0,1fr)}
body[data-layout="diagram"] .narr{order:2}
body[data-layout="diagram"] .narr .para:not(:first-child),body[data-layout="diagram"] .narr .think{display:none}
body[data-layout="diagram"] .narr .para:first-child{font-size:.95rem;color:var(--muted);max-width:80ch}
.split.nofig{grid-template-columns:minmax(0,1fr)}
.split.nofig .narr{max-width:72ch}
.split.wide{grid-template-columns:minmax(0,.85fr) minmax(0,1.15fr)}
body[data-layout="text"] .split.wide,body[data-layout="diagram"] .split.wide{grid-template-columns:minmax(0,1fr)}

.narr .para{margin:0 0 1em;padding:2px 6px;margin-left:-6px;border-radius:4px;transition:background .25s}
.narr .para.speaking{background:var(--mark)}
.narr strong{font-weight:650}
.narr .lead{font-size:1.14rem}
.narr ul{margin:0 0 1em;padding-left:1.2em}
.narr li{margin:.25em 0}
.think{border-left:3px solid var(--wk);background:var(--wk-soft);padding:12px 16px;border-radius:0 var(--r) var(--r) 0;margin:1.2em 0}
.think .eyebrow{color:var(--wk);display:block;margin-bottom:4px}
.src{font-size:.82rem;color:var(--muted);font-family:var(--f-display);border-top:1px dashed var(--line);padding-top:10px;margin-top:16px}
.notes{margin-top:20px;border:1px dashed var(--warn);border-radius:var(--r);padding:12px 16px;font-family:var(--f-display);font-size:.9rem;background:color-mix(in srgb,var(--warn) 7%,transparent)}
.notes .eyebrow{color:var(--warn);display:block;margin-bottom:4px}
.notes ul{margin:.3em 0 0;padding-left:1.1em}
body:not(.teacher) .notes{display:none}

.fig{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:18px;min-width:0}
.fig > .eyebrow{display:block;margin-bottom:10px}
.fig svg{width:100%;height:auto;display:block}
.fig svg text{font-family:var(--f-display);fill:var(--ink)}
.fig svg .t-muted{fill:var(--muted)}
.fig svg .t-mono{font-family:var(--f-mono)}
.fig .caption{font-size:.84rem;color:var(--muted);font-family:var(--f-display);margin-top:10px}

/* pager */
.pager{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-top:30px;padding-top:16px;border-top:1px solid var(--line)}
.pager button{border:1px solid var(--line);background:var(--surface);border-radius:var(--r);padding:10px 16px;cursor:pointer;font-family:var(--f-display);text-align:left;min-width:0;max-width:48%}
.pager button small{display:block;color:var(--muted);font-family:var(--f-mono);font-size:.68rem;letter-spacing:.08em;text-transform:uppercase}
.pager button:disabled{opacity:.35;cursor:default}
.pager .next{text-align:right;margin-left:auto;border-color:var(--wk)}
.progress{height:3px;background:var(--line);position:relative}
.progress i{position:absolute;inset:0 auto 0 0;background:var(--wk);transition:width .3s}
.kbd{font-family:var(--f-mono);font-size:.72rem;color:var(--muted)}

/* ---------- shared widgets ---------- */
.btn{border:1px solid var(--wk);background:var(--wk);color:var(--on-wk);border-radius:8px;padding:7px 14px;cursor:pointer;font-family:var(--f-display);font-weight:600;font-size:.88rem}
.btn.ghost{background:none;color:var(--wk)}
.btn:disabled{opacity:.4;cursor:default}
.row{display:flex;flex-wrap:wrap;gap:8px;align-items:center}
.stack{display:grid;gap:10px}
.ui{font-family:var(--f-display);font-size:.92rem}
.ui label{font-weight:600}
input[type=range]{width:100%;accent-color:var(--wk)}
textarea,input[type=text]{width:100%;border:1px solid var(--line);background:var(--bg);color:var(--ink);border-radius:8px;padding:8px 10px;font:inherit;font-size:.92rem;resize:vertical}
.tag{display:inline-block;font-family:var(--f-mono);font-size:.68rem;letter-spacing:.06em;text-transform:uppercase;padding:2px 7px;border-radius:4px;background:var(--sunk);color:var(--muted)}
.tag.good{background:color-mix(in srgb,var(--good) 15%,transparent);color:var(--good)}
.tag.bad{background:color-mix(in srgb,var(--bad) 15%,transparent);color:var(--bad)}
.tag.warn{background:color-mix(in srgb,var(--warn) 15%,transparent);color:var(--warn)}
.feedback{font-family:var(--f-display);font-size:.88rem;padding:8px 12px;border-radius:8px;background:var(--sunk)}

/* quiz */
.quiz{display:grid;gap:18px}
.q{border:1px solid var(--line);border-radius:var(--r);padding:14px 16px;background:var(--bg)}
.q h4{font-size:1rem;margin-bottom:10px;font-weight:650}
.q .opts{display:grid;gap:6px}
.q .opt{border:1px solid var(--line);background:var(--surface);border-radius:8px;padding:8px 12px;text-align:left;cursor:pointer;font-family:var(--f-display);font-size:.92rem}
.q .opt:hover:not(:disabled){border-color:var(--wk)}
.q .opt.right{border-color:var(--good);background:color-mix(in srgb,var(--good) 12%,transparent)}
.q .opt.wrong{border-color:var(--bad);background:color-mix(in srgb,var(--bad) 10%,transparent)}
.q .opt:disabled{cursor:default}
.q .why{margin-top:8px}
.score{font-family:var(--f-display);font-weight:700}

/* sort */
.sort{display:grid;gap:8px}
.sort .item{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:8px 12px;align-items:center;border:1px solid var(--line);border-radius:8px;padding:8px 10px;background:var(--bg)}
.sort .item p{margin:0;font-family:var(--f-display);font-size:.92rem}
.sort .choices{display:flex;flex-wrap:wrap;gap:4px}
.sort .choices button{border:1px solid var(--line);background:var(--surface);border-radius:6px;padding:3px 8px;font-family:var(--f-display);font-size:.78rem;cursor:pointer}
.sort .choices button[aria-pressed="true"]{background:var(--ink);color:var(--bg);border-color:var(--ink)}
.sort .item .why{grid-column:1/-1;font-family:var(--f-display);font-size:.84rem;color:var(--muted)}
.sort .item:has(.choices button:nth-child(4)){grid-template-columns:minmax(0,1fr)}

/* worksheet */
.ws{display:grid;gap:12px}
.ws .f label{display:block;font-family:var(--f-display);font-weight:600;font-size:.9rem;margin-bottom:4px}
.ws .f small{display:block;color:var(--muted);font-family:var(--f-display);font-size:.8rem;margin-bottom:4px}

/* poll */
.poll{display:grid;gap:8px}
.poll button.o{display:grid;grid-template-columns:minmax(0,1fr) auto;align-items:center;gap:8px;border:1px solid var(--line);background:var(--bg);border-radius:8px;padding:9px 12px;text-align:left;cursor:pointer;font-family:var(--f-display);font-size:.92rem}
.poll button.o[aria-pressed="true"]{border-color:var(--wk);background:var(--wk-soft)}

/* ---------- four-step boxes (from the lecture decks) ---------- */
:root{--plain:#6B4FB8;--ex:#2563A8;--exam:#9A5B00}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]){--plain:#B9A3F5;--ex:#7DB3F0;--exam:#F0B048}}
:root[data-theme="dark"]{--plain:#B9A3F5;--ex:#7DB3F0;--exam:#F0B048}
.box{border-radius:10px;padding:10px 14px;border:1px solid;font-size:.97rem}
.box > b.lbl{display:block;font-family:var(--f-mono);font-size:.68rem;letter-spacing:.1em;text-transform:uppercase;font-weight:600;margin-bottom:3px}
.box.plain{border-color:color-mix(in srgb,var(--plain) 45%,transparent);background:color-mix(in srgb,var(--plain) 8%,transparent)}
.box.plain > b.lbl{color:var(--plain)}
.box.ex{border-color:color-mix(in srgb,var(--ex) 45%,transparent);background:color-mix(in srgb,var(--ex) 8%,transparent)}
.box.ex > b.lbl{color:var(--ex)}
.box.exam{border-color:color-mix(in srgb,var(--exam) 55%,transparent);background:color-mix(in srgb,var(--exam) 10%,transparent)}
.box.exam > b.lbl{color:var(--exam)}
.box ul{margin:.3em 0 0;padding-left:1.1em}
.para:has(> .box){padding:0;margin-left:0}
.para.speaking > .box{outline:3px solid var(--mark)}
.legend{display:flex;flex-wrap:wrap;gap:6px 14px;font-family:var(--f-display);font-size:.82rem;color:var(--muted)}
.legend i{display:inline-block;width:10px;height:10px;border-radius:2px;margin-right:5px;vertical-align:-1px}

/* tables used inside narration/figures */
.tbl{width:100%;border-collapse:collapse;font-family:var(--f-display);font-size:.86rem}
.tbl th,.tbl td{border-bottom:1px solid var(--line);padding:7px 8px;text-align:left;vertical-align:top}
.tbl th{font-family:var(--f-mono);font-size:.66rem;letter-spacing:.07em;text-transform:uppercase;color:var(--muted);font-weight:400}
.tbl td:first-child{font-weight:650}

/* picker (tiles that reveal detail) */
.picker{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:10px}
.picker h4{font-family:var(--f-mono);font-size:.68rem;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);margin-bottom:6px}
.picker button{display:block;width:100%;text-align:left;border:1px solid var(--line);background:var(--bg);border-radius:8px;padding:7px 10px;margin-bottom:6px;cursor:pointer;font-family:var(--f-display);font-size:.87rem}
.picker button[aria-pressed="true"]{border-color:var(--wk);background:var(--wk-soft)}
.pick-detail{margin-top:10px;font-family:var(--f-display);font-size:.92rem;border-top:1px solid var(--line);padding-top:10px}
.pick-detail p{margin:.4em 0 0}

/* accordion */
.acc{display:grid;gap:8px}
.acc details{border:1px solid var(--line);border-radius:8px;background:var(--bg);padding:9px 12px;font-family:var(--f-display);font-size:.92rem}
.acc summary{cursor:pointer;font-weight:650}
.acc p{margin:.45em 0 0}

/* practice questions */
.prac{display:grid;gap:8px}
.prac .pq{border:1px solid var(--line);border-radius:8px;background:var(--bg);padding:10px 12px;font-family:var(--f-display);font-size:.92rem}
.prac .pq .row{justify-content:space-between}
.prac .pq .hint{margin-top:8px;border-left:3px solid var(--exam);padding-left:10px;color:var(--ink)}

/* flashcards */
.fc-tools{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin-bottom:10px;font-family:var(--f-display);font-size:.88rem}
.fc{display:grid;grid-template-columns:repeat(auto-fill,minmax(190px,1fr));gap:8px}
.fc button{border:1px solid var(--line);background:var(--bg);border-radius:10px;padding:12px;text-align:left;cursor:pointer;min-height:92px;display:flex;flex-direction:column;gap:6px;font-family:var(--f-display)}
.fc button b{font-size:.98rem}
.fc button span{font-size:.85rem;color:var(--muted)}
.fc.test button:not(.open) span{visibility:hidden}
.fc.test button:not(.open)::after{content:"Tap to reveal";font-family:var(--f-mono);font-size:.66rem;color:var(--muted);letter-spacing:.06em;text-transform:uppercase;margin-top:auto}
.fc button.known{border-color:var(--good)}

/* order game */
.order{display:flex;flex-wrap:wrap;gap:8px}
.order button{border:1px solid var(--line);background:var(--bg);border-radius:8px;padding:8px 10px;cursor:pointer;font-family:var(--f-display);font-size:.86rem;text-align:left;max-width:240px}
.order button.done{border-color:var(--good);background:color-mix(in srgb,var(--good) 12%,transparent);cursor:default}
.order button.no{animation:shake .3s}
.order button .yr{font-family:var(--f-mono);font-weight:600;color:var(--good)}
@keyframes shake{25%{transform:translateX(-4px)}75%{transform:translateX(4px)}}

/* full-width figure under the narration */
.split.full{grid-template-columns:minmax(0,1fr)}
.split.full .narr{max-width:76ch}

/* video */
.videos{display:grid;gap:12px;margin:1.2em 0}
.video{border:1px solid var(--line);border-radius:12px;overflow:hidden;background:var(--surface)}
.vframe{position:relative;aspect-ratio:16/9;max-width:100%;background:#000}
.vframe iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
.vcard{display:flex;gap:14px;align-items:center;padding:14px 16px;text-decoration:none;color:var(--ink);background:var(--wk-soft);font-family:var(--f-display)}
.vcard b{display:block}.vcard small{color:var(--muted)}
.vplay{width:46px;height:46px;border-radius:50%;background:var(--wk);color:var(--on-wk);display:grid;place-items:center;font-size:1.1rem;flex:none}
.vmeta{padding:10px 14px;font-family:var(--f-display);font-size:.9rem}
.vmeta b{display:block;margin:2px 0}
.vmeta p{margin:.3em 0;color:var(--muted)}

/* flowchart */
.fsteps{display:flex;flex-wrap:wrap;align-items:stretch;gap:6px}
.fstep{flex:1 1 110px;border:1.5px solid var(--line);background:var(--bg);border-radius:10px;padding:9px 10px;text-align:left;cursor:pointer;font-family:var(--f-display);display:flex;flex-direction:column;gap:2px;transition:background .25s,border-color .25s,transform .25s}
.fstep .fn{font-family:var(--f-mono);font-size:.66rem;color:var(--muted)}
.fstep b{font-size:.9rem}.fstep small{font-size:.76rem;color:var(--muted)}
.fstep.done{border-color:color-mix(in srgb,var(--wk) 45%,var(--line))}
.fstep.on{border-color:var(--wk);background:var(--wk-soft);transform:translateY(-2px)}
.farrow{align-self:center;color:var(--muted);font-family:var(--f-mono)}

/* mind map */
.mmap svg{width:100%;max-width:720px;height:auto;display:block;overflow:visible;margin:0 auto}
.mm-b{cursor:pointer}
.mm-b:focus-visible rect{stroke:var(--ink)}
.mm-c{height:100%;display:flex;align-items:center;justify-content:center;text-align:center;color:var(--on-wk);font:700 13px/1.2 var(--f-display)}
.mm-t{height:100%;display:flex;align-items:center;justify-content:center;text-align:center;color:var(--ink);font:600 12.5px/1.15 var(--f-display)}
.mm-l{height:100%;display:flex;align-items:center;color:var(--ink);font:12px/1.25 var(--f-display)}
.mm-center{display:inline-block;background:var(--wk);color:var(--on-wk);border-radius:999px;padding:8px 16px;font-family:var(--f-display);font-weight:700;margin-bottom:10px}
.mmap .acc ul{margin:.4em 0 0;padding-left:1.1em}

/* ---------- responsive ---------- */
@media (max-width:900px){
  .shell{grid-template-columns:minmax(0,1fr);padding:16px 16px 40px}
  .toc{position:static;max-height:none}
  .toc ol{display:flex;overflow-x:auto;gap:4px;padding-bottom:6px}
  .toc li button{white-space:nowrap;grid-template-columns:auto auto}
  .toc li button .t{display:none}
  .toc li button[aria-current="true"] .t{display:inline}
  .split,.split.wide{grid-template-columns:minmax(0,1fr)}
  .bar-in{padding:8px 16px}
  .brand span{display:none}
}
@media (prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}

/* bars + study cards */
.hbars{display:grid;gap:8px}
.hb{display:grid;grid-template-columns:minmax(0,9.5em) minmax(0,1fr) 4.2em;gap:10px;align-items:center;font-family:var(--f-display);font-size:.86rem}
.hb .hl{text-align:right;color:var(--muted)}
.hb .ht{height:18px;background:var(--sunk);border-radius:4px;overflow:hidden}
.hb .ht i{display:block;height:100%;background:color-mix(in srgb,var(--wk) 55%,transparent);border-radius:4px}
.hb.on .ht i{background:var(--wk)} .hb.on .hl{color:var(--ink);font-weight:700}
.hb .hv{font-variant-numeric:tabular-nums;font-weight:700}
.hn{color:var(--muted);margin:4px 0 0}
.study{border:1px solid var(--line);border-left:4px solid var(--wk);border-radius:8px;padding:12px 14px;background:var(--bg);display:grid;gap:6px;margin-bottom:14px}
.study p{margin:0;font-family:var(--f-display);font-size:.92rem}
.study cite{font-style:normal;font-family:var(--f-display);font-size:.78rem;color:var(--muted)}
.study .sstat{font-family:var(--f-display);font-size:1.8rem;line-height:1;color:var(--wk)}
@media (max-width:520px){.hb{grid-template-columns:minmax(0,7em) minmax(0,1fr) 3.6em;font-size:.8rem}}

/* search + ask panel */
.sr-wrap{position:fixed;inset:0;z-index:60;background:color-mix(in srgb,var(--ink) 35%,transparent);display:flex;justify-content:center;align-items:flex-start;padding:calc(env(safe-area-inset-top,0px) + 6vh) 16px 16px}
.sr{width:min(680px,100%);max-height:84vh;display:flex;flex-direction:column;background:var(--surface);border:1px solid var(--line);border-radius:14px;box-shadow:0 18px 50px rgba(0,0,0,.25);overflow:hidden}
.sr-top{display:flex;gap:8px;padding:12px;border-bottom:1px solid var(--line)}
.sr-top input{flex:1;min-width:0;font:inherit;font-family:var(--f-display);font-size:1rem;padding:10px 12px;border:1px solid var(--line);border-radius:10px;background:var(--bg);color:var(--ink)}
.sr-out{overflow:auto;padding:10px 12px;display:grid;gap:8px}
.sr-hint{margin:6px 2px;color:var(--muted);font-family:var(--f-display);font-size:.9rem}
.sr-def{display:grid;gap:2px;border-left:4px solid var(--wk);background:var(--wk-soft);border-radius:0 8px 8px 0;padding:8px 10px;font-family:var(--f-display);font-size:.92rem}
.sr-list{list-style:none;margin:0;padding:0;display:grid;gap:6px}
.sr-list a{display:grid;gap:2px;text-decoration:none;color:var(--ink);border:1px solid var(--line);border-radius:10px;padding:8px 10px;font-family:var(--f-display);font-size:.9rem;background:var(--bg)}
.sr-list a:hover,.sr-list a:focus-visible{border-color:var(--wk)}
.sr-list small{font-family:var(--f-mono);font-size:.7rem;color:var(--muted)}
.sr-list span{color:var(--muted);font-size:.84rem}
.sr-ask{border-top:1px solid var(--line);padding:10px 12px;font-family:var(--f-display);font-size:.86rem;color:var(--muted);display:flex;flex-wrap:wrap;gap:8px;align-items:center}
.sr-ask .mono{color:var(--ink);user-select:all}
.sr-wrap[hidden]{display:none}
.support-note{max-width:1440px;margin:0 auto;padding:14px 20px 90px;border-top:1px solid var(--line);font-family:var(--f-display);font-size:.84rem;color:var(--muted);text-align:center}

/* credential card */
.cred{border:1.5px solid var(--good);border-radius:12px;padding:14px 16px;margin:1.2em 0;background:color-mix(in srgb,var(--good) 7%,transparent);font-family:var(--f-display);display:grid;gap:4px}
.cred .eyebrow{color:var(--good)}
.cred b{font-size:1.05rem}
.cred-meta{font-size:.86rem;color:var(--muted)}
.cred .row{margin-top:6px;gap:12px}
.cred .btn{background:var(--good);border-color:var(--good);color:var(--surface)}
.cred .btn.ghost{background:none;color:var(--good)}
.cred-done{display:flex;gap:6px;align-items:center;font-size:.9rem;font-weight:400}
.cred-steps{margin:.4em 0 0;padding-left:1.2em;font-size:.92rem}
.cred-all{font-size:.88rem;margin-top:4px}
.chip.k-bonus{border-color:var(--good);color:var(--good)}

/* guided credential card: Do → Learn → Return */
.cred-g .cred-flags{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:4px}
.cred-g .cred-flags span{font:700 .72rem var(--f-mono);letter-spacing:.06em;text-transform:uppercase;border:1px solid var(--good);color:var(--good);border-radius:999px;padding:2px 9px}
.cred-g .cred-t{font-size:1.08rem}
.cred-go{list-style:none;margin:8px 0 4px;padding:0;display:grid;gap:8px;counter-reset:cg}
.cred-go li{counter-increment:cg;display:grid;grid-template-columns:30px 76px minmax(0,1fr);gap:4px 10px;align-items:start;background:var(--surface);border:1px solid var(--line);border-radius:10px;padding:10px 12px}
.cred-go li::before{content:counter(cg);width:26px;height:26px;border-radius:50%;background:var(--good);color:var(--surface);display:grid;place-items:center;font-weight:800;font-size:.85rem;grid-row:span 3}
.cred-go li > b{font-size:.95rem}
.cred-go li > span{font-size:.92rem;line-height:1.45}
.cred-go li > .btn,.cred-go li > .row{grid-column:3;justify-self:start;margin-top:4px}
.cred-cert{margin:6px 0 0;font-size:.9rem}
.cred-free{margin:2px 0 0;font-size:.86rem;color:var(--muted)}
@media (max-width:560px){.cred-go li{grid-template-columns:30px minmax(0,1fr)}.cred-go li > span,.cred-go li > .btn,.cred-go li > .row{grid-column:2}}