:root{box-sizing:border-box;padding-top:env(safe-area-inset-top,0px);padding-bottom:env(safe-area-inset-bottom,0px);color-scheme:dark;--g-bg:#060B14;--g-ink:#E8F0F6;--g-mut:#8FA4B6;--g-line:#23364B;--g-teal:#3CCFD0;--g-vio:#A99BFF;--g-cor:#FF7A59}html{scroll-behavior:smooth;scroll-padding-top:70px}*{box-sizing:border-box}body{margin:0;color:var(--g-ink);background:radial-gradient(900px 500px at 80% -5%,rgba(139,108,255,.22),transparent),radial-gradient(700px 400px at 0 35%,rgba(34,211,238,.1),transparent),var(--g-bg)}body:before{content:"";position:fixed;inset:0 0 auto;height:env(safe-area-inset-top,0px);z-index:99;background:var(--g-bg)}#bg3d{position:fixed;top:0;right:0;bottom:0;left:0;width:100%;height:100%;z-index:-1;pointer-events:none}#gnav{position:sticky;top:env(safe-area-inset-top,0px);z-index:90;display:flex;align-items:center;gap:4px;padding:10px 16px;background:#060b14d1;backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--g-line);overflow-x:auto;white-space:nowrap;font-family:IBM Plex Sans,system-ui,Segoe UI,sans-serif}#gnav .br{display:flex;align-items:center;gap:8px;margin-right:12px;font:700 17px/1 Bricolage Grotesque,Segoe UI,sans-serif;color:var(--g-ink);text-decoration:none}#gnav .grp{font:500 11px/1 IBM Plex Mono,ui-monospace,monospace;letter-spacing:.12em;text-transform:uppercase;color:var(--g-teal);margin:0 6px 0 14px}#gnav a.l{color:var(--g-mut);text-decoration:none;font-size:13px;padding:5px 9px;border-radius:99px}#gnav a.l:hover{background:#ffffff14;color:var(--g-ink)}.divider{position:relative;text-align:center;padding:64px 18px 24px;font-family:IBM Plex Sans,system-ui,sans-serif;color:var(--g-ink)}.divider .k{font:500 12px/1 IBM Plex Mono,monospace;letter-spacing:.14em;text-transform:uppercase;color:var(--g-cor)}.divider h2{font:700 clamp(28px,5vw,46px)/1.1 "Bricolage Grotesque","Segoe UI",sans-serif;margin:12px 0 8px;background:linear-gradient(90deg,#22d3ee,#8b6cff,#f472b6);-webkit-background-clip:text;background-clip:text;color:transparent}.divider p{margin:0 auto;max-width:640px;color:var(--g-mut)}.divider:before{content:"";display:block;height:1px;max-width:1050px;margin:0 auto 40px;background:linear-gradient(90deg,transparent,var(--g-line),transparent)}.qh-b,.qh-a{position:relative}.qh-b section{background:transparent}.qh-a{background:none;font:16px/1.7 Segoe UI,system-ui,sans-serif}.qh-a nav#nv{position:static;flex-wrap:wrap;white-space:normal;overflow:visible;justify-content:center;max-width:1050px;margin:0 auto 10px;border:1px solid var(--bd);border-radius:16px}.qh-a nav#nv b{margin-right:12px}.qh-a .hero{height:78vh}.qh-a .hero>div{z-index:2}html[data-theme=light]{color-scheme:light;--g-bg:#F5F7FB;--g-ink:#0E1826;--g-mut:#566779;--g-line:#CBD5E1;--g-teal:#0B8A8D;--g-cor:#D9482A}html[data-theme=light] body{background:radial-gradient(900px 500px at 80% -5%,rgba(139,108,255,.14),transparent),radial-gradient(700px 400px at 0 35%,rgba(34,211,238,.12),transparent),var(--g-bg)}html[data-theme=light] #bg3d{opacity:.45}html[data-theme=light] #gnav{background:#f5f7fbd9}html[data-theme=light] #gnav a.l:hover{background:#0000000f}html[data-theme=light] .qh-b{--bg:#F5F7FB;--bg2:#EAEFF6;--surface:#FFFFFF;--surface2:#F0F3F9;--ink:#0E1826;--body:#2B3A4A;--muted:#566779;--line:#CBD5E1;--line-soft:#E2E8F0;--teal:#0B8A8D;--teal-soft:#D5F1F1;--coral:#D9482A;--coral-soft:#FDE3DC;--violet:#6C5CE7;--violet-soft:#E6E2FF;--amber:#B7791F;--amber-soft:#FCEFCB;--good:#1E9E55;--good-soft:#D7F3E2;--bad:#D13B30;--bad-soft:#FADAD7;color-scheme:light}html[data-theme=light] .qh-a{--bg:#f4f5ff;--tx:#12142b;--mut:#4d5683;--card:rgba(20,20,80,.05);--bd:rgba(20,20,80,.16);--a:#6d4aff;--b:#0891b2;--c:#db2777;color-scheme:light}html[data-theme=light] .qh-b .hero,html[data-theme=light] .qh-b .sim{--bg:#060B14;--bg2:#0A121D;--surface:#0E1826;--surface2:#142235;--ink:#E8F0F6;--body:#C3D1DC;--muted:#8FA4B6;--line:#23364B;--line-soft:#172536;--teal:#3CCFD0;--teal-soft:#0F3338;--coral:#FF7A59;--coral-soft:#3A1E17;--violet:#A99BFF;--violet-soft:#241F45;--amber:#F2C14E;--amber-soft:#3A2F12;--good:#5BD68B;--good-soft:#0F2E1D;--bad:#FF8A80;--bad-soft:#3A1816;color-scheme:dark}html[data-theme=light] .qh-b .sim{background:#0e1826;border-radius:14px;padding:10px;color:#e8f0f6}html[data-theme=light] .qh-a .sim,html[data-theme=light] .qh-a .cv{--bg:#070a1a;--tx:#e8ecff;--mut:#a3abcf;--card:rgba(255,255,255,.06);--bd:rgba(255,255,255,.13);--a:#8b6cff;--b:#22d3ee;--c:#f472b6;color-scheme:dark}html[data-theme=light] .qh-a .sim{background:#0b1030;border-radius:14px;padding:10px;color:#e8ecff}html[data-theme=light] .qh-a .cv{background:#0b1030}html[data-theme=light] .qh-a .card{box-shadow:0 8px 28px #1414501f}.tgl{margin-left:auto;flex:none;cursor:pointer;font:600 13px/1 IBM Plex Sans,system-ui,sans-serif;color:var(--g-ink);background:transparent;border:1px solid var(--g-line);border-radius:99px;padding:7px 14px}.tgl:hover{border-color:var(--g-teal)}.qh-b .progress{display:flex;flex-wrap:wrap;align-items:center;gap:8px 16px;margin-bottom:16px;font-size:14px;color:var(--muted)}.qh-b .progress .bar{flex:1 1 200px;height:8px;background:var(--line-soft);border-radius:4px;overflow:hidden}.qh-b .progress .bar i{display:block;height:100%;width:0;background:var(--teal);transition:width .3s}.qh-b .progress strong{color:var(--ink);font-variant-numeric:tabular-nums}.qh-b .tabs{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:8px}.qh-b .tab{text-align:left;padding:12px 14px;border-radius:10px;border:1px solid var(--line);background:var(--surface);cursor:pointer;display:grid;gap:4px;min-width:0}.qh-b .tab:hover{border-color:var(--ink)}.qh-b .tab .tn{font:500 12px/1 var(--font-mono);letter-spacing:.08em;color:var(--muted)}.qh-b .tab .tt{font:700 17px/1.15 var(--font-display)}.qh-b .tab .tc{font:400 12px/1 var(--font-mono);color:var(--muted);font-variant-numeric:tabular-nums}.qh-b .tab[aria-selected=true]{background:var(--ink);border-color:var(--ink);color:var(--bg)}.qh-b .tab[aria-selected=true] .tn,.qh-b .tab[aria-selected=true] .tc{color:var(--bg);opacity:.75}.qh-b .panel{margin-top:16px;background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:28px;display:grid;grid-template-columns:minmax(0,.8fr) minmax(0,1.2fr);gap:36px}.qh-b .panel h3{font-size:28px}.qh-b .panel .time{margin-top:8px;font:400 13px/1.4 var(--font-mono);color:var(--teal)}.qh-b .panel .blurb{margin-top:16px;color:var(--muted)}.qh-b .panel dl{margin:22px 0 0;display:grid;gap:14px}.qh-b .panel dt{font:500 12px/1 var(--font-mono);letter-spacing:.12em;text-transform:uppercase;color:var(--muted)}.qh-b .panel dd{margin:6px 0 0;font-size:15px}.qh-b .topics{display:grid;gap:0;margin:0;padding:0;list-style:none}.qh-b .topic{display:grid;grid-template-columns:22px minmax(0,1fr);gap:14px;padding:14px 0;border-bottom:1px solid var(--line-soft);cursor:pointer}.qh-b .topic:first-child{padding-top:0}.qh-b .topic:last-child{border-bottom:0;padding-bottom:0}.qh-b .topic input{width:20px;height:20px;margin:2px 0 0;accent-color:var(--teal);cursor:pointer}.qh-b .topic b{display:block;font-weight:600}.qh-b .topic span{display:block;font-size:14px;color:var(--muted);margin-top:2px}.qh-b .topic input:checked+div b{color:var(--muted);text-decoration:line-through;text-decoration-thickness:1px}.qh-b .gtable{border-top:1px solid var(--ink)}.qh-b .grow{display:grid;grid-template-columns:90px minmax(170px,230px) 190px minmax(0,1fr);gap:8px 28px;align-items:center;padding:18px 0;border-bottom:1px solid var(--line)}.qh-b .grow .gn{font:700 28px/1 var(--font-display)}.qh-b .grow .gname{font-weight:600}.qh-b .grow .gdesc{color:var(--muted);font-size:15px}.qh-b .mat{display:inline-grid;gap:4px 16px;padding:4px 12px;border-left:2px solid var(--ink);border-right:2px solid var(--ink);border-radius:4px;font:500 14px/1.3 var(--font-mono);text-align:center;align-items:center}.qh-b .matwrap{display:flex;align-items:center;gap:8px;font:400 13px/1 var(--font-mono);color:var(--muted)}.qh-b .gnote{margin-top:16px;font-size:14px;color:var(--muted);max-width:70ch}.qh-b .quiz{background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:28px}.qh-b .chips{display:flex;flex-wrap:wrap;gap:8px}.qh-b .chip{border:1px solid var(--line);background:transparent;border-radius:999px;padding:7px 14px;font-size:14px;cursor:pointer}.qh-b .chip:hover{border-color:var(--ink)}.qh-b .chip[aria-pressed=true]{background:var(--ink);color:var(--bg);border-color:var(--ink)}.qh-b .qmeta{margin-top:28px;display:flex;flex-wrap:wrap;justify-content:space-between;gap:6px 16px;font:400 13px/1.4 var(--font-mono);color:var(--muted)}.qh-b .qbar{margin-top:10px;height:4px;border-radius:2px;background:var(--line-soft);overflow:hidden}.qh-b .qbar i{display:block;height:100%;background:var(--teal);width:0;transition:width .3s}.qh-b .qtext{margin-top:22px;font:700 clamp(1.25rem,2.4vw,1.65rem)/1.25 var(--font-display);letter-spacing:-.01em;max-width:46ch;text-wrap:balance}.qh-b .opts{display:grid;gap:10px;margin-top:22px;max-width:760px}.qh-b .opt{display:grid;grid-template-columns:30px minmax(0,1fr);gap:12px;align-items:baseline;text-align:left;padding:14px 16px;border-radius:12px;border:1px solid var(--line);background:var(--surface);cursor:pointer;transition:border-color .15s,background .15s}.qh-b .opt:hover:not(:disabled){border-color:var(--ink)}.qh-b .opt .k{font:500 13px/1 var(--font-mono);color:var(--muted)}.qh-b .opt:disabled{cursor:default}.qh-b .opt.correct{background:var(--good-soft);border-color:var(--good)}.qh-b .opt.wrong{background:var(--bad-soft);border-color:var(--bad)}.qh-b .opt.dim{opacity:.55}.qh-b .fb{margin-top:18px;max-width:760px;padding:14px 16px;border-radius:12px;background:var(--bg);font-size:15px}.qh-b .fb strong{display:block;margin-bottom:4px}.qh-b .fb.ok strong{color:var(--good)}.qh-b .fb.no strong{color:var(--bad)}.qh-b .qnext{margin-top:18px}.qh-b .result{margin-top:28px;display:grid;gap:14px;max-width:60ch}.qh-b .result .score{font:700 clamp(2.6rem,7vw,4.4rem)/1 var(--font-display);letter-spacing:-.03em}.qh-b .result .score small{font-size:.4em;color:var(--muted);letter-spacing:0}.qh-b .result p{color:var(--muted)}.qh-b .pgrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(min(100%,320px),1fr));gap:16px;margin-top:24px}.qh-b .pcard{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:20px;display:grid;grid-template-rows:auto auto 1fr auto;gap:12px;min-width:0}.qh-b .ptop{display:flex;justify-content:space-between;align-items:center;gap:8px;font:500 12px/1 var(--font-mono);color:var(--muted)}.qh-b .pill{background:var(--teal-soft);color:var(--teal);padding:5px 9px;border-radius:6px;letter-spacing:.06em}.qh-b .pcard h3{font-size:20px;line-height:1.2}.qh-b .pcard .pd{color:var(--muted);font-size:15px}.qh-b .pmeta{display:grid;gap:6px;font-size:13px;padding-top:12px;border-top:1px solid var(--line-soft)}.qh-b .pmeta b{font:500 11px/1 var(--font-mono);letter-spacing:.1em;text-transform:uppercase;color:var(--muted);margin-right:6px}.qh-b .rgrid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:48px}.qh-b .rgrid h3{font-size:22px;margin-bottom:8px}.qh-b .rlist{list-style:none;margin:0;padding:0}.qh-b .rlist li{padding:14px 0;border-bottom:1px solid var(--line);display:grid;grid-template-columns:minmax(0,1fr) auto;gap:4px 16px;align-items:baseline}.qh-b .rlist b{font-weight:600}.qh-b .rlist .rd{grid-column:1 / -1;color:var(--muted);font-size:14px}.qh-b .rlist .pill{font-size:11px;padding:4px 8px}.qh-b{color-scheme:dark;--bg: #060B14;--bg2: #0A121D;--surface: #0E1826;--surface2: #142235;--ink: #E8F0F6;--body: #C3D1DC;--muted: #8FA4B6;--line: #23364B;--line-soft: #172536;--teal: #3CCFD0;--teal-soft: #0F3338;--coral: #FF7A59;--coral-soft: #3A1E17;--violet: #A99BFF;--violet-soft: #241F45;--amber: #F2C14E;--amber-soft: #3A2F12;--good: #5BD68B;--good-soft: #0F2E1D;--bad: #FF8A80;--bad-soft: #3A1816;--font-display: "Bricolage Grotesque", "Segoe UI", system-ui, sans-serif;--font-body: "IBM Plex Sans", system-ui, -apple-system, "Segoe UI", sans-serif;--font-mono: "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace}.qh-b *{box-sizing:border-box}.qh-b{scroll-behavior:smooth}.qh-b{margin:0;background:var(--bg);color:var(--ink);font:400 16px/1.65 var(--font-body);-webkit-font-smoothing:antialiased}.qh-b .wrap{max-width:1180px;margin-inline:auto;padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px))}.qh-b a{color:inherit}.qh-b button{font:inherit;color:inherit}.qh-b :focus-visible{outline:2px solid var(--teal);outline-offset:2px;border-radius:4px}.qh-b h1,.qh-b h2,.qh-b h3,.qh-b h4{margin:0}.qh-b h1,.qh-b h2,.qh-b h3{font-family:var(--font-display);text-wrap:balance;letter-spacing:-.02em;line-height:1.08}.qh-b p{margin:0}.qh-b .mono{font-family:var(--font-mono)}.qh-b .eyebrow{font:500 12px/1 var(--font-mono);letter-spacing:.14em;text-transform:uppercase;color:var(--teal)}.qh-b .top{position:sticky;top:env(safe-area-inset-top,0px);z-index:50;background:#060b14db;backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--line-soft)}.qh-b .top .wrap{display:flex;align-items:center;gap:12px 28px;padding-block:11px}.qh-b .brand{display:inline-flex;align-items:center;gap:10px;text-decoration:none;font:700 19px/1 var(--font-display);white-space:nowrap;flex:none}.qh-b .top nav{display:flex;gap:4px 20px;overflow-x:auto;scrollbar-width:none;min-width:0;flex:1;font-size:14px}.qh-b .top nav::-webkit-scrollbar{display:none}.qh-b .top nav a{text-decoration:none;color:var(--muted);padding:6px 0;white-space:nowrap;border-bottom:1px solid transparent}.qh-b .top nav a:hover{color:var(--ink);border-bottom-color:var(--ink)}.qh-b .hero{position:relative;overflow:hidden;border-bottom:1px solid var(--line);background:radial-gradient(1200px 600px at 75% 40%,#0F2236 0%,var(--bg) 70%)}.qh-b #hero3d{position:absolute;top:0;right:0;bottom:0;left:0;width:100%;height:100%;display:block;cursor:grab;touch-action:pan-y}.qh-b #hero3d:active{cursor:grabbing}.qh-b .hero:after{content:"";position:absolute;top:0;right:0;bottom:0;left:0;pointer-events:none;background:linear-gradient(90deg,#060b14f0,#060b1499 46%,#060b1400 76%)}.qh-b .hero .wrap{position:relative;z-index:2;padding-block:84px 72px;pointer-events:none}.qh-b .hero-copy{max-width:640px}.qh-b .hero-copy a,.qh-b .hero-copy button{pointer-events:auto}.qh-b .hero h1{font-size:clamp(2.5rem,6vw,4.6rem);font-weight:700;margin-top:20px}.qh-b .hero h1 em{font-style:normal;color:var(--teal)}.qh-b .hero .lead{margin-top:22px;font-size:18px;color:var(--body);max-width:54ch}.qh-b .cta{display:flex;flex-wrap:wrap;gap:12px;margin-top:30px}.qh-b .btn{border:1px solid var(--ink);background:var(--ink);color:var(--bg);padding:11px 18px;border-radius:10px;font-weight:600;font-size:14px;cursor:pointer;text-decoration:none;display:inline-block}.qh-b .btn:hover{opacity:.88}.qh-b .btn.ghost{background:transparent;color:var(--ink);border-color:var(--line)}.qh-b .btn.ghost:hover{border-color:var(--ink);opacity:1}.qh-b .btn.sm{padding:8px 12px;font-size:13px;border-radius:8px}.qh-b .hero-stats{display:flex;flex-wrap:wrap;gap:10px 32px;margin-top:40px;font:400 13px/1.3 var(--font-mono);color:var(--muted)}.qh-b .hero-stats b{display:block;font:700 26px/1 var(--font-display);color:var(--ink);margin-bottom:4px}.qh-b .hint{margin-top:22px;font:400 12px/1.4 var(--font-mono);color:var(--muted);letter-spacing:.04em}.qh-b section{padding-block:72px;border-top:1px solid var(--line)}.qh-b .sec-head{display:grid;gap:14px;max-width:68ch;margin-bottom:34px}.qh-b .sec-head h2{font-size:clamp(1.8rem,3.6vw,2.7rem)}.qh-b .sec-head p{color:var(--body)}.qh-b .lead2{font-size:18px;color:var(--body);max-width:70ch}.qh-b .prose p{color:var(--body);max-width:68ch}.qh-b .prose p+p{margin-top:14px}.qh-b .sub{font:700 clamp(1.3rem,2.4vw,1.7rem)/1.15 var(--font-display);letter-spacing:-.01em;margin:44px 0 16px}.qh-b .cols3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:0;border-top:1px solid var(--ink)}.qh-b .cols3>div{padding:22px 24px 8px 0;min-width:0}.qh-b .cols3>div+div{padding-left:24px;border-left:1px solid var(--line)}.qh-b .cols3 h3{font-size:22px;margin-bottom:10px}.qh-b .cols3 p{color:var(--body);font-size:15px}.qh-b .cols3 p+p{margin-top:10px}.qh-b .tag{display:inline-block;font:500 11px/1 var(--font-mono);letter-spacing:.08em;text-transform:uppercase;padding:5px 8px;border-radius:6px;background:var(--teal-soft);color:var(--teal);white-space:nowrap}.qh-b .tag.use{background:var(--good-soft);color:var(--good)}.qh-b .tag.early{background:var(--teal-soft);color:var(--teal)}.qh-b .tag.pilot{background:var(--amber-soft);color:var(--amber)}.qh-b .tag.research{background:var(--violet-soft);color:var(--violet)}.qh-b .tag.long{background:var(--coral-soft);color:var(--coral)}.qh-b .tbl{overflow-x:auto;border:1px solid var(--line);border-radius:14px;margin-top:8px}.qh-b .tbl table{border-collapse:collapse;width:100%;min-width:620px;font-size:14px}.qh-b .tbl th,.qh-b .tbl td{text-align:left;padding:12px 16px;border-bottom:1px solid var(--line-soft);vertical-align:top}.qh-b .tbl th{font:500 11px/1 var(--font-mono);letter-spacing:.1em;text-transform:uppercase;color:var(--muted);background:var(--surface)}.qh-b .tbl tr:last-child td{border-bottom:0}.qh-b .tbl td:first-child{font-weight:600;white-space:nowrap}.qh-b .tbl td{color:var(--body)}.qh-b .tiltgrid{display:grid;gap:16px;perspective:1000px}.qh-b .tiltgrid.g4{grid-template-columns:repeat(auto-fill,minmax(min(100%,260px),1fr))}.qh-b .tiltgrid.g3{grid-template-columns:repeat(auto-fill,minmax(min(100%,330px),1fr))}.qh-b .tilt{background:linear-gradient(160deg,var(--surface2) 0%,var(--surface) 60%);border:1px solid var(--line);border-radius:16px;padding:22px;transform-style:preserve-3d;transition:transform .18s ease-out,border-color .18s;min-width:0;display:flex;flex-direction:column;gap:10px}.qh-b .tilt:hover{border-color:var(--teal)}.qh-b .tilt h3{font-size:21px;line-height:1.15}.qh-b .tilt .row1{display:flex;justify-content:space-between;align-items:center;gap:8px;flex-wrap:wrap}.qh-b .tilt p{color:var(--body);font-size:14.5px}.qh-b .tilt dl{margin:4px 0 0;display:grid;gap:8px}.qh-b .tilt dt{font:500 11px/1 var(--font-mono);letter-spacing:.1em;text-transform:uppercase;color:var(--muted)}.qh-b .tilt dd{margin:3px 0 0;font-size:14px;color:var(--body)}.qh-b .flow{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,175px),1fr));border-top:1px solid var(--ink);counter-reset:st}.qh-b .flow>div{padding:18px 16px 6px 0;counter-increment:st;min-width:0}.qh-b .flow>div+div{padding-left:16px;border-left:1px solid var(--line)}.qh-b .flow>div:before{content:counter(st);display:block;font:500 12px/1 var(--font-mono);color:var(--teal);margin-bottom:10px}.qh-b .flow b{display:block;font:700 18px/1.2 var(--font-display);margin-bottom:6px}.qh-b .flow span{font-size:14px;color:var(--body);display:block}.qh-b .stack{display:grid;gap:8px;max-width:560px}.qh-b .stack div{background:var(--surface);border:1px solid var(--line);border-radius:10px;padding:12px 16px;font-size:14px;color:var(--body)}.qh-b .stack b{color:var(--ink);font-weight:600;margin-right:6px}.qh-b .stack div:nth-child(1){border-color:var(--teal)}.qh-b .stack div:nth-child(6){border-color:var(--coral)}.qh-b .twocol{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:40px;align-items:start}.qh-b .tl{display:grid;margin:0;padding:0;list-style:none}.qh-b .tl li{display:grid;grid-template-columns:76px 16px minmax(0,1fr);gap:0 16px;padding-bottom:20px}.qh-b .tl .yr{font:500 14px/1.5 var(--font-mono);color:var(--teal);text-align:right}.qh-b .tl .dot{position:relative}.qh-b .tl .dot:before{content:"";position:absolute;left:50%;top:9px;width:9px;height:9px;margin-left:-4.5px;border-radius:50%;background:var(--teal)}.qh-b .tl .dot:after{content:"";position:absolute;left:50%;top:22px;bottom:-20px;width:1px;background:var(--line)}.qh-b .tl li:last-child .dot:after{display:none}.qh-b .tl b{display:block;font-weight:600}.qh-b .tl span{color:var(--body);font-size:14.5px;display:block}.qh-b .tl li.now .dot:before{background:var(--coral);box-shadow:0 0 0 4px var(--coral-soft)}.qh-b .tl li.now .yr{color:var(--coral)}.qh-b .callout{border:1px solid var(--amber);background:var(--amber-soft);border-radius:12px;padding:14px 16px;font-size:14.5px;color:var(--body);max-width:72ch}.qh-b .callout b{color:var(--amber)}.qh-b .lessons{display:grid}.qh-b .chipnav{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:12px}.qh-b .chipnav a{text-decoration:none;border:1px solid var(--line);border-radius:999px;padding:7px 14px;font-size:14px;color:var(--body)}.qh-b .chipnav a:hover{border-color:var(--teal);color:var(--ink)}.qh-b .lesson{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.08fr);gap:44px;padding-block:60px;border-top:1px solid var(--line);align-items:start}.qh-b .lesson:first-child{border-top:0}.qh-b .lesson .meta{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin-bottom:14px}.qh-b .lesson h3{font-size:clamp(1.7rem,3.2vw,2.4rem)}.qh-b .lesson .tagline{margin-top:12px;font-size:18px;color:var(--body)}.qh-b .lesson h4{font:500 12px/1 var(--font-mono);letter-spacing:.14em;text-transform:uppercase;color:var(--teal);margin:30px 0 12px}.qh-b .lesson p{color:var(--body)}.qh-b .lesson p+p{margin-top:12px}.qh-b .lesson ul{margin:0;padding-left:1.2em;color:var(--body);display:grid;gap:8px}.qh-b .lesson li::marker{color:var(--teal)}.qh-b .eqn{font:500 14px/1.6 var(--font-mono);background:var(--surface);border:1px solid var(--line);border-radius:10px;padding:12px 14px;color:var(--ink);overflow-x:auto}.qh-b .eqn+.eqn{margin-top:8px}.qh-b .watch{border-left:2px solid var(--coral);padding:4px 0 4px 14px;color:var(--body)}.qh-b .watch b{color:var(--coral);font-weight:600}.qh-b .sim{background:var(--surface);border:1px solid var(--line);border-radius:18px;padding:18px;min-width:0;display:grid;gap:12px;box-shadow:0 30px 60px -30px #0009}.qh-b .sim-head{display:flex;justify-content:space-between;align-items:baseline;gap:6px 12px;flex-wrap:wrap}.qh-b .sim-head b{font:700 17px/1.2 var(--font-display)}.qh-b .sim-head span{font:400 12px/1.3 var(--font-mono);color:var(--muted)}.qh-b .sim canvas{display:block;width:100%;max-width:100%;border-radius:12px;background:var(--bg2);touch-action:pan-y}.qh-b .sim canvas.drag{cursor:grab}.qh-b .ctl{display:grid;grid-template-columns:92px minmax(0,1fr) 62px;gap:10px;align-items:center;font:400 13px/1.2 var(--font-mono);color:var(--muted)}.qh-b .ctl output{text-align:right;color:var(--ink);font-variant-numeric:tabular-nums}.qh-b .ctl select{grid-column:2 / 4;background:var(--bg2);color:var(--ink);border:1px solid var(--line);border-radius:8px;padding:7px 8px;font:inherit}.qh-b input[type=range]{width:100%;accent-color:var(--coral);margin:0}.qh-b .row{display:flex;flex-wrap:wrap;gap:8px;align-items:center}.qh-b .actions{display:flex;flex-wrap:wrap;gap:8px;margin-top:14px}.qh-b .gb{font:500 15px/1 var(--font-mono);padding:11px 0;min-width:46px;flex:1 1 46px;border-radius:9px;border:1px solid var(--line);background:var(--bg2);cursor:pointer;transition:border-color .15s,color .15s,background .15s}.qh-b .gb:hover{border-color:var(--coral);color:var(--coral)}.qh-b .gb:active{background:var(--coral-soft)}.qh-b .gb.on{border-color:var(--coral);color:var(--coral);background:var(--coral-soft)}.qh-b .readout{font:400 13px/1.55 var(--font-mono);background:var(--bg2);border-radius:10px;padding:10px 12px;overflow-wrap:anywhere;color:var(--body)}.qh-b .readout b{color:var(--ink);font-weight:500}.qh-b .readout .ok{color:var(--good)}.qh-b .readout .no{color:var(--bad)}.qh-b .pr{display:grid;grid-template-columns:40px minmax(0,1fr) 58px;gap:10px;align-items:center;font:400 13px/1 var(--font-mono)}.qh-b .pr .track{height:10px;border-radius:5px;background:var(--line-soft);overflow:hidden}.qh-b .pr .fill{height:100%;background:var(--teal);border-radius:5px;transition:width .25s}.qh-b .pr .v{text-align:right;font-variant-numeric:tabular-nums}.qh-b .note{font-size:13px;color:var(--muted)}.qh-b .cgrid{display:grid;gap:6px;overflow-x:auto;padding-bottom:4px}.qh-b .crow{display:grid;grid-template-columns:34px repeat(8,40px);gap:6px;align-items:center;min-width:max-content}.qh-b .crow .ql{font:500 12px/1 var(--font-mono);color:var(--muted)}.qh-b .cell{position:relative;height:40px;border-radius:8px;border:1px solid var(--line-soft);background:var(--bg2);cursor:pointer;font:500 14px/1 var(--font-mono);padding:0}.qh-b .cell:before{content:"";position:absolute;left:0;right:0;top:50%;height:1px;background:var(--line);z-index:0}.qh-b .cell:hover{border-color:var(--teal)}.qh-b .cell.g{background:var(--coral-soft);border-color:var(--coral);color:var(--coral)}.qh-b .cell.g:before{display:none}.qh-b .cell.c,.qh-b .cell.t{border-color:var(--violet);color:var(--violet);background:var(--violet-soft)}.qh-b .cell.c:before,.qh-b .cell.t:before{display:none}.qh-b .cell.dn:after,.qh-b .cell.up:after{content:"";position:absolute;left:50%;width:2px;margin-left:-1px;background:var(--violet);z-index:2}.qh-b .cell.dn:after{top:50%;height:calc(50% + 7px)}.qh-b .cell.up:after{bottom:50%;height:calc(50% + 7px)}.qh-b .cell span{position:relative;z-index:3}.qh-b .hbar{display:grid;grid-template-columns:52px minmax(0,1fr) 48px;gap:8px;align-items:center;font:400 12px/1 var(--font-mono);margin-top:4px;color:var(--body)}.qh-b .hbar .track{height:8px;border-radius:4px;background:var(--line-soft);overflow:hidden}.qh-b .hbar .fill{height:100%;background:var(--coral)}.qh-b .bb{overflow-x:auto}.qh-b .bb table{border-collapse:collapse;font:400 12px/1 var(--font-mono);min-width:max-content}.qh-b .bb td,.qh-b .bb th{padding:5px 6px;text-align:center;border-bottom:1px solid var(--line-soft)}.qh-b .bb th{text-align:left;color:var(--muted);font-weight:400;padding-right:12px;position:sticky;left:0;background:var(--surface);white-space:nowrap}.qh-b .bb td.keep{background:var(--teal-soft);color:var(--teal)}.qh-b .bb td.err{background:var(--bad-soft);color:var(--bad)}.qh-b .qrow{display:flex;flex-wrap:wrap;gap:10px;justify-content:center;padding:8px 0}.qh-b .qb{width:38px;height:38px;border-radius:50%;display:grid;place-items:center;font:500 13px/1 var(--font-mono);border:2px solid var(--teal);color:var(--teal);background:var(--teal-soft)}.qh-b .qb.flip{border-color:var(--coral);color:var(--coral);background:var(--coral-soft)}.qh-b .qb.syn{width:26px;height:26px;border-radius:6px;border-color:var(--line);color:var(--muted);background:var(--bg2);font-size:11px}.qh-b .qb.syn.hit{border-color:var(--amber);color:var(--amber);background:var(--amber-soft)}.qh-b .srow2{display:flex;flex-wrap:wrap;gap:10px;justify-content:center;align-items:center;font:400 12px/1 var(--font-mono);color:var(--muted)}.qh-b footer{border-top:1px solid var(--line);padding-block:36px 56px;font-size:14px;color:var(--muted)}.qh-b footer .src{margin-top:16px;display:grid;gap:6px}.qh-b footer a{color:var(--body)}@media (max-width: 980px){.qh-b .lesson{grid-template-columns:minmax(0,1fr);gap:28px;padding-block:44px}.qh-b .twocol{grid-template-columns:minmax(0,1fr);gap:28px}.qh-b .panel{grid-template-columns:minmax(0,1fr);gap:28px;padding:22px}.qh-b .rgrid{grid-template-columns:minmax(0,1fr);gap:36px}.qh-b .grow{grid-template-columns:80px minmax(0,1fr)}.qh-b .grow .gname,.qh-b .grow .gdesc{grid-column:1 / -1}.qh-b .quiz{padding:20px}.qh-b section{padding-block:52px}}@media (max-width: 760px){.qh-b .cols3{grid-template-columns:minmax(0,1fr)}.qh-b .cols3>div,.qh-b .cols3>div+div{padding:18px 0 8px;border-left:0}.qh-b .cols3>div+div{border-top:1px solid var(--line)}.qh-b .hero:after{background:linear-gradient(180deg,#060b14e0,#060b14b3)}.qh-b .hero .wrap{padding-block:56px 48px}.qh-b .tl li{grid-template-columns:56px 12px minmax(0,1fr);gap:0 10px}}@media (max-width: 520px){.qh-b .ctl{grid-template-columns:70px minmax(0,1fr) 54px}.qh-b .sim{padding:14px}.qh-b .flow>div,.qh-b .flow>div+div{padding-left:0;border-left:0;border-bottom:1px solid var(--line-soft);padding-bottom:14px}}@media (prefers-reduced-motion: reduce){.qh-b{scroll-behavior:auto}.qh-b *{transition:none!important}}.qh-a{--bg:#070a1a;--tx:#e8ecff;--mut:#a3abcf;--card:rgba(255,255,255,.06);--bd:rgba(255,255,255,.13);--a:#8b6cff;--b:#22d3ee;--c:#f472b6;color-scheme:dark}.qh-a{scroll-behavior:smooth}.qh-a *{box-sizing:border-box}.qh-a{margin:0;background:radial-gradient(900px 500px at 80% -5%,rgba(139,108,255,.25),transparent),radial-gradient(700px 400px at 0 30%,rgba(34,211,238,.12),transparent),var(--bg);color:var(--tx);font:16px/1.7 Segoe UI,system-ui,sans-serif}.qh-a nav{position:sticky;top:env(safe-area-inset-top,0px);z-index:9;display:flex;gap:6px;align-items:center;padding:10px 18px;background:color-mix(in srgb,var(--bg) 80%,transparent);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border-bottom:1px solid var(--bd);overflow-x:auto;white-space:nowrap}.qh-a nav b{margin-right:auto;font-size:18px;background:linear-gradient(90deg,var(--b),var(--a),var(--c));-webkit-background-clip:text;background-clip:text;color:transparent}.qh-a nav a{color:var(--mut);text-decoration:none;font-size:13px;padding:4px 9px;border-radius:99px}.qh-a nav a:hover{background:var(--card);color:var(--tx)}.qh-a .hero{position:relative;height:84vh;min-height:520px;display:grid;place-items:center;text-align:center;overflow:hidden}.qh-a #hero3d{position:absolute;top:0;right:0;bottom:0;left:0;width:100%;height:100%}.qh-a .hero div{position:relative;max-width:760px;padding:0 20px}.qh-a h1{font-size:clamp(36px,7vw,72px);line-height:1.05;margin:0 0 14px;background:linear-gradient(90deg,var(--b),var(--a),var(--c));-webkit-background-clip:text;background-clip:text;color:transparent}.qh-a .hero p{color:var(--mut);font-size:18px}.qh-a .cta{display:inline-block;margin:6px;padding:12px 24px;border-radius:99px;background:linear-gradient(90deg,var(--a),var(--b));color:#fff;text-decoration:none;font-weight:600}.qh-a .cta.g{background:var(--card);border:1px solid var(--bd);color:var(--tx)}.qh-a main{max-width:1050px;margin:auto;padding:0 18px 60px}.qh-a section{margin:56px 0}.qh-a .card{background:var(--card);border:1px solid var(--bd);border-radius:20px;padding:26px;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px)}.qh-a h2{font-size:clamp(26px,4vw,38px);margin:8px 0 12px}.qh-a .sub{color:var(--mut)}.qh-a .lv{display:inline-block;font-size:12px;letter-spacing:.08em;text-transform:uppercase;padding:3px 12px;border-radius:99px;border:1px solid var(--b);color:var(--b)}.qh-a .lv.Intermediate{border-color:var(--a);color:var(--a)}.qh-a .lv.Advanced{border-color:var(--c);color:var(--c)}.qh-a li{margin:7px 0}.qh-a li::marker{color:var(--b)}.qh-a .sim{margin-top:18px;border-top:1px dashed var(--bd);padding-top:16px}.qh-a .sim h4{margin:0 0 8px;color:var(--b)}.qh-a .grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:18px;align-items:start}.qh-a .cv{position:relative;height:300px;border-radius:14px;background:#0000002e;border:1px solid var(--bd);overflow:hidden}.qh-a .cv canvas{display:block;margin:auto}.qh-a .l{position:absolute;transform:translate(-50%);font-size:13px;color:var(--mut)}.qh-a button{cursor:pointer;font:inherit;font-size:14px;color:var(--tx);background:var(--card);border:1px solid var(--bd);border-radius:10px;padding:7px 14px;margin:3px}.qh-a button:hover{border-color:var(--b)}.qh-a .btns{margin-bottom:8px}.qh-a .mono{font-family:ui-monospace,Menlo,monospace;font-size:13px;color:var(--mut)}.qh-a .bars{display:flex;gap:4px;align-items:flex-end;height:150px;margin-top:10px}.qh-a .bars.sm{height:140px}.qh-a .bc{flex:1;display:flex;flex-direction:column;justify-content:flex-end;align-items:center;font-size:10px;color:var(--mut);min-width:0;cursor:default}.qh-a .bv{width:100%;background:linear-gradient(var(--b),var(--a));border-radius:4px 4px 0 0;transition:height .35s}.qh-a .bc.h .bv{background:var(--c)}.qh-a .cols{display:flex;gap:3px;flex-wrap:wrap;margin:8px 0}.qh-a .col{display:flex;flex-direction:column;align-items:center;font-size:11px;padding:3px 4px;border-radius:6px;border:1px solid transparent;opacity:.45}.qh-a .col i{font-style:normal;color:var(--mut)}.qh-a .col.k{opacity:1;border-color:var(--b)}.qh-a .col.e{border-color:#f87171;background:#f871712e}.qh-a .q{margin:16px 0}.qh-a .q button{display:block;width:100%;text-align:left}.qh-a .q .ok{border-color:#34d399;background:#34d39926}.qh-a .q .no{border-color:#f87171;background:#f8717126}.qh-a .pj{display:grid;grid-template-columns:repeat(auto-fit,minmax(290px,1fr));gap:16px}.qh-a .pj .card{padding:20px}.qh-a .pj h3{margin:8px 0 4px;font-size:18px}.qh-a .pj p{margin:4px 0;color:var(--mut);font-size:14px}.qh-a .sim canvas{display:block;width:100%;max-width:520px;margin-top:8px;border-radius:12px;background:#0000002e;border:1px solid var(--bd)}.qh-a input[type=range]{accent-color:var(--a);vertical-align:middle}.qh-a select,.qh-a input[type=number]{background:var(--card);color:var(--tx);border:1px solid var(--bd);border-radius:8px;padding:4px}.qh-a #bg3d{position:fixed;top:0;right:0;bottom:0;left:0;width:100%;height:100%;z-index:-1;pointer-events:none}.qh-a .tilt{transition:transform .15s ease-out}.qh-a .card{box-shadow:0 12px 40px #00000047}.qh-a section>.card:hover{border-color:#8b6cff8c}.qh-a button.on{border-color:var(--b);background:#22d3ee29}.qh-a footer{text-align:center;color:var(--mut);padding:30px;border-top:1px solid var(--bd);font-size:14px}.qh-c{--bg:#060B14;--sf:#0E1826;--sf2:#142235;--ink:#E8F0F6;--bd:#C3D1DC;--mut:#8FA4B6;--ln:#23364B;--tl:#3CCFD0;--co:#FF7A59;--vi:#A99BFF;--am:#F2C14E;--gd:#5BD68B;color:var(--ink);font:400 16px/1.65 IBM Plex Sans,system-ui,Segoe UI,sans-serif}html[data-theme=light] .qh-c{--bg:#F5F7FB;--sf:#FFFFFF;--sf2:#F0F3F9;--ink:#0E1826;--bd:#2B3A4A;--mut:#566779;--ln:#CBD5E1;--tl:#0B8A8D;--co:#D9482A;--vi:#6C5CE7;--am:#B7791F;--gd:#1E9E55}.qh-c *{box-sizing:border-box}.qh-c section{padding:56px 0;border-top:1px solid var(--ln)}.qh-c .w{max-width:1180px;margin:auto;padding:0 18px}.qh-c .ey{font:500 12px/1 IBM Plex Mono,ui-monospace,monospace;letter-spacing:.14em;text-transform:uppercase;color:var(--tl)}.qh-c h2{font:700 clamp(26px,4vw,40px)/1.1 "Bricolage Grotesque","Segoe UI",sans-serif;margin:10px 0 8px;letter-spacing:-.02em}.qh-c h3{font:700 20px/1.2 Bricolage Grotesque,Segoe UI,sans-serif;margin:0 0 8px}.qh-c p{margin:0 0 10px;color:var(--bd)}.qh-c .lead{color:var(--mut);max-width:760px}.qh-c a{color:var(--tl)}.qh-c .g2{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:16px;margin-top:22px}.qh-c .g3{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:14px;margin-top:18px}.qh-c .cd{background:var(--sf);border:1px solid var(--ln);border-radius:16px;padding:20px;transition:transform .15s ease-out,border-color .2s}.qh-c .cd:hover{border-color:var(--tl)}.qh-c .tag{display:inline-block;font:500 11px/1 IBM Plex Mono,monospace;letter-spacing:.08em;text-transform:uppercase;padding:5px 9px;border-radius:6px;background:#3ccfd024;color:var(--tl);margin:0 6px 6px 0}.qh-c ul{margin:8px 0 0;padding-left:1.1em;color:var(--bd)}.qh-c li{margin:5px 0}.qh-c .kv{display:grid;grid-template-columns:repeat(auto-fit,minmax(130px,1fr));gap:10px;margin:14px 0}.qh-c .kv div{background:var(--sf2);border-radius:12px;padding:12px;text-align:center}.qh-c .kv b{display:block;font:700 24px/1 Bricolage Grotesque,sans-serif;color:var(--tl)}.qh-c .kv span{font-size:12px;color:var(--mut)}.qh-c .chips{display:flex;flex-wrap:wrap;gap:8px;margin:14px 0}.qh-c button,.qh-c select{font:inherit;font-size:14px;color:var(--ink);background:var(--sf2);border:1px solid var(--ln);border-radius:10px;padding:7px 13px;cursor:pointer}.qh-c button:hover{border-color:var(--tl)}.qh-c button.on{background:var(--tl);color:#04141a;border-color:var(--tl)}.qh-c .ct{display:grid;grid-template-columns:auto 1fr auto;gap:4px 12px;align-items:center;padding:12px 0;border-bottom:1px solid var(--ln)}.qh-c .ct small{grid-column:2/4;color:var(--mut)}.qh-c .ct input{width:20px;height:20px;accent-color:var(--tl)}.qh-c .ct .hr{font:500 13px IBM Plex Mono,monospace;color:var(--am)}.qh-c .sim{background:#0e1826;border:1px solid var(--ln);border-radius:16px;padding:16px;color:#e8f0f6}.qh-c .sim p,.qh-c .sim label{color:#c3d1dc}.qh-c .sim h3{color:#e8f0f6}.qh-c .sim canvas{display:block;width:100%;border-radius:12px;background:#08101b;touch-action:none}.qh-c .sim button,.qh-c .sim select{background:#142235;color:#e8f0f6;border-color:#23364b}.qh-c .sim .ro{font:13px/1.5 IBM Plex Mono,monospace;color:#8fa4b6;margin-top:8px;min-height:40px}.qh-c .sim input[type=range]{width:100%;accent-color:#3CCFD0}.qh-c .row{display:flex;flex-wrap:wrap;gap:6px;margin:8px 0;align-items:center}.qh-c .stage{perspective:1000px;height:340px;display:grid;place-items:center;margin-top:14px;overflow:hidden}.qh-c .stack{position:relative;width:300px;height:190px;transform-style:preserve-3d;transform:rotateX(58deg) rotate(-32deg);animation:qhfl 7s ease-in-out infinite}@keyframes qhfl{0%,to{transform:rotateX(58deg) rotate(-32deg)}50%{transform:rotateX(52deg) rotate(-22deg)}}.qh-c .ly{position:absolute;top:0;right:0;bottom:0;left:0;border-radius:16px;border:2px solid;display:grid;place-items:center;text-align:center;font:600 15px/1.2 IBM Plex Sans,sans-serif;color:#fff;cursor:pointer;transition:transform .35s,filter .25s;padding:12px;-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px)}.qh-c .ly:nth-child(1){background:#a99bff8c;border-color:#a99bff;transform:translateZ(130px)}.qh-c .ly:nth-child(2){background:#3ccfd080;border-color:#3ccfd0;transform:translateZ(65px)}.qh-c .ly:nth-child(3){background:#ff7a5980;border-color:#ff7a59;transform:translateZ(0)}.qh-c .ly.on{filter:brightness(1.35);box-shadow:0 0 30px #ffffff59}.qh-c .ly:hover{filter:brightness(1.25)}.qh-c .big{font:700 clamp(20px,3vw,28px)/1.1 "Bricolage Grotesque",sans-serif;color:var(--tl)}.qh-c .pl li{list-style:none;margin:0;padding:12px 0;border-bottom:1px solid var(--ln);display:grid;grid-template-columns:30px 1fr auto;gap:10px}.qh-c .pl{padding:0;margin-top:10px}.qh-c .pl .n{font:700 20px Bricolage Grotesque,sans-serif;color:var(--co)}@media (prefers-reduced-motion:reduce){.qh-c .stack{animation:none}}