:root{--navy:#14243A;--blue:#2864DC;--teal:#27A89A;--bg:#fff;--alt:#F4F7FB;--text:#263445;--bd:#E2E8F0;--mut:#5b6b80;--hf:"Plus Jakarta Sans",Inter,system-ui,-apple-system,"Segoe UI",sans-serif;box-sizing:border-box}
*,*::before,*::after{box-sizing:inherit}
html{scroll-behavior:smooth;scroll-padding-top:96px}
body{margin:0;background:var(--bg);color:var(--text);font:17px/1.75 Inter,system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;-webkit-font-smoothing:antialiased;overflow-x:hidden}
h1,h2,h3{font-family:var(--hf);color:var(--navy);letter-spacing:-.02em;line-height:1.2}
a{color:var(--blue)}
.w{max-width:1100px;margin:0 auto;padding:0 24px}.r{max-width:780px}.wide{max-width:1280px}
.skip{position:absolute;left:-999px;top:8px;background:#fff;padding:8px 14px;border-radius:8px;z-index:200}.skip:focus{left:12px}
:focus-visible{outline:3px solid var(--teal);outline-offset:3px}
/* header */
.hd{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.85);-webkit-backdrop-filter:saturate(180%) blur(14px);backdrop-filter:saturate(180%) blur(14px);border-bottom:1px solid transparent;transition:box-shadow .3s,border-color .3s}
.hd.sc{box-shadow:0 8px 30px rgba(20,36,58,.08);border-color:var(--bd)}
.bar{display:flex;align-items:center;gap:24px;height:76px}
.logo{display:flex;align-items:center;gap:10px;font:800 1.3rem var(--hf);color:var(--navy);text-decoration:none;letter-spacing:-.03em;flex:none}
.logo b{color:var(--blue);font-weight:800}.logo svg{transition:transform .5s}.logo:hover svg{transform:rotate(-12deg) scale(1.08)}
nav{margin-left:auto}
nav ul{display:flex;gap:2px;list-style:none;margin:0;padding:0}
nav a{position:relative;display:block;padding:10px 13px;font:600 .9rem var(--hf);color:var(--text);text-decoration:none;white-space:nowrap;border-radius:10px;transition:color .25s}
nav a::after{content:"";position:absolute;left:13px;right:13px;bottom:4px;height:2px;border-radius:2px;background:linear-gradient(90deg,var(--blue),var(--teal));transform:scaleX(0);transform-origin:left;transition:transform .3s}
nav a:hover,nav a[aria-current]{color:var(--blue)}nav a:hover::after,nav a[aria-current]::after{transform:scaleX(1)}
nav li.m{display:none}
#mb{display:none;margin-left:auto;flex-direction:column;justify-content:center;gap:5px;width:46px;height:46px;padding:0 12px;background:#fff;border:1px solid var(--bd);border-radius:12px;cursor:pointer}
#mb span{display:block;height:2px;background:var(--navy);border-radius:2px;transition:transform .3s,opacity .3s}
#mb[aria-expanded=true] span:nth-child(1){transform:translateY(7px) rotate(45deg)}#mb[aria-expanded=true] span:nth-child(2){opacity:0}#mb[aria-expanded=true] span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
/* buttons */
.btn{display:inline-flex;align-items:center;gap:8px;padding:14px 26px;border-radius:12px;font:700 .95rem var(--hf);text-decoration:none;border:2px solid transparent;margin:6px 10px 6px 0;cursor:pointer;transition:transform .25s,box-shadow .25s,background .25s}
.p{background:linear-gradient(135deg,var(--blue),#1d4fb8);color:#fff;box-shadow:0 10px 24px rgba(40,100,220,.35)}.p:hover{transform:translateY(-3px);box-shadow:0 16px 34px rgba(40,100,220,.45)}
.g{color:#fff;border-color:rgba(255,255,255,.35);background:rgba(255,255,255,.06)}.g:hover{background:rgba(255,255,255,.16);transform:translateY(-3px)}
.sm{padding:10px 20px;margin:0;font-size:.88rem}
.arr::after{content:"→";transition:transform .25s}.arr:hover::after{transform:translateX(5px)}
/* hero */
.hero,.phero{position:relative;overflow:hidden;color:#c3d1e6;background:linear-gradient(135deg,#0b1626 0%,#14243A 50%,#173a7a 100%)}
.hero{padding:96px 0 90px}.phero{padding:64px 0 72px}
.hero::before{content:"";position:absolute;inset:0;background-image:linear-gradient(rgba(255,255,255,.05) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.05) 1px,transparent 1px);background-size:48px 48px;-webkit-mask-image:radial-gradient(ellipse at 30% 40%,#000 15%,transparent 75%);mask-image:radial-gradient(ellipse at 30% 40%,#000 15%,transparent 75%)}
.orb,.phero::after{position:absolute;border-radius:50%;filter:blur(80px);animation:fl 14s ease-in-out infinite}
.o1{width:400px;height:400px;background:#2864DC;top:-90px;right:6%;opacity:.5}.o2{width:300px;height:300px;background:#27A89A;bottom:-120px;left:-60px;opacity:.35;animation-delay:-6s}
.phero::after{content:"";width:340px;height:340px;right:-80px;top:-120px;background:#2864DC;opacity:.4}
@keyframes fl{50%{transform:translate(30px,40px) scale(1.1)}}
.hero .w,.phero .w{position:relative;z-index:1}
.hg{display:grid;grid-template-columns:1.15fr .85fr;gap:40px;align-items:center}
.hero h1,.phero h1{color:#fff;font-size:clamp(2.2rem,5vw,3.6rem);margin:18px 0 20px}.phero h1{font-size:clamp(2rem,4.2vw,3.1rem);margin:12px 0 14px}
.gt{background:linear-gradient(90deg,#7fb0ff,#4fe0cd);-webkit-background-clip:text;background-clip:text;color:transparent}
.eyebrow{display:inline-flex;gap:10px;align-items:center;padding:7px 15px;border-radius:99px;background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.16);font:600 .82rem var(--hf);color:#bfe9e3}
.eyebrow::before{content:"";width:8px;height:8px;border-radius:50%;background:var(--teal);animation:pl 2s infinite}
@keyframes pl{0%{box-shadow:0 0 0 0 rgba(39,168,154,.7)}70%,100%{box-shadow:0 0 0 10px rgba(39,168,154,0)}}
.lead{font-size:1.15rem;color:#c3d1e6;max-width:620px;margin:0}
.heroart{width:100%;height:auto;filter:drop-shadow(0 24px 40px rgba(0,0,0,.35))}
.dash{animation:dsh 1.4s linear infinite}@keyframes dsh{to{stroke-dashoffset:-32}}
.nd{animation:bob 5s ease-in-out infinite}.nd2{animation-delay:-1.6s}.nd3{animation-delay:-3.2s}@keyframes bob{50%{transform:translateY(-9px)}}
.heroart text{font:600 12.5px Inter,sans-serif;fill:#cfe0ff}
.crumb{font-size:.88rem;margin:0;color:#9fb3d1}.crumb a{color:#9cc0ff;text-decoration:none}.crumb a:hover{text-decoration:underline}
/* sections */
section.s{padding:92px 0}section.alt{background:linear-gradient(180deg,#F4F7FB,#EBF1FA)}
.home section.s h2{text-align:center;font-size:clamp(1.8rem,3.4vw,2.5rem);margin:0}
.home section.s h2::after{content:"";display:block;width:56px;height:4px;border-radius:4px;margin:16px auto 0;background:linear-gradient(90deg,var(--blue),var(--teal))}
.home section.s h2+*{margin-top:40px}.home .s h3{margin-top:2em}
/* cards */
.grid{display:grid;gap:22px;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));counter-reset:c}
.card{position:relative;overflow:hidden;display:block;background:#fff;border:1px solid var(--bd);border-radius:20px;padding:28px;color:var(--text);text-decoration:none;counter-increment:c;box-shadow:0 2px 6px rgba(20,36,58,.04);transition:transform .35s cubic-bezier(.2,.7,.2,1),box-shadow .35s,border-color .35s}
.card::after{content:"";position:absolute;inset:0;background:linear-gradient(135deg,#14243A 0%,#2864DC 65%,#27A89A 125%);opacity:0;transition:opacity .4s}
.card>*,.card::before{position:relative;z-index:1}
.card::before{content:counter(c,decimal-leading-zero);display:grid;place-items:center;width:44px;height:44px;border-radius:14px;margin-bottom:18px;background:linear-gradient(135deg,var(--blue),var(--teal));color:#fff;font:800 .9rem var(--hf);transition:background .4s,transform .4s}
.card h3{margin:0 0 8px;font-size:1.15rem;transition:color .3s}.card p{margin:0;font-size:.97rem;color:var(--mut);transition:color .3s}
.card:hover{transform:translateY(-8px);box-shadow:0 24px 50px rgba(40,100,220,.28);border-color:transparent}
.card:hover::after{opacity:1}.card:hover h3{color:#fff}.card:hover p{color:#dbe7ff}.card:hover::before{background:rgba(255,255,255,.18);transform:rotate(-8deg) scale(1.1)}
/* flow */
.flow{display:flex;flex-wrap:wrap;gap:10px;align-items:center;margin:36px 0}
.flow div{flex:1 1 150px;padding:16px 12px;border-radius:14px;text-align:center;font:700 .92rem var(--hf);color:var(--navy);background:#fff;border:1px solid var(--bd);box-shadow:0 6px 18px rgba(20,36,58,.06);animation:gl 6s infinite}
.flow div:nth-child(3){animation-delay:1.5s}.flow div:nth-child(5){animation-delay:3s}.flow div:nth-child(7){animation-delay:4.5s}
@keyframes gl{12%{border-color:var(--teal);box-shadow:0 0 0 6px rgba(39,168,154,.2)}25%{}}
.flow i{font-style:normal;color:var(--teal);font-weight:800;animation:ar 1.4s ease-in-out infinite}@keyframes ar{50%{transform:translateX(5px)}}
.hero .flow div{background:rgba(255,255,255,.07);border-color:rgba(255,255,255,.16);color:#fff;box-shadow:none}
.hero .flow{margin:56px 0 0}.hero .note{background:rgba(255,255,255,.06);color:#c3d1e6;border-color:rgba(255,255,255,.12);border-left-color:var(--teal)}
/* content bits */
.note{padding:18px 22px 18px 26px;border-radius:14px;background:linear-gradient(90deg,rgba(39,168,154,.1),rgba(40,100,220,.05));border:1px solid rgba(39,168,154,.25);border-left:4px solid var(--teal);font-size:.95rem;margin:24px 0}
pre{background:#0f1d31;color:#c9e2ff;border-radius:14px;padding:20px 22px;overflow-x:auto;font:.86rem/1.7 ui-monospace,Menlo,Consolas,monospace;box-shadow:0 12px 30px rgba(15,29,49,.25)}
code{background:#eaf0fc;color:#1d4fb8;padding:2px 7px;border-radius:6px;font:.86em ui-monospace,Menlo,Consolas,monospace;word-break:break-word}
table{border-collapse:separate;border-spacing:0;width:100%;font-size:.92rem;border:1px solid var(--bd);border-radius:14px;overflow:hidden}
th{background:var(--navy);color:#fff;text-align:left;font-family:var(--hf)}td,th{padding:11px 14px;word-break:break-word}td{border-top:1px solid var(--bd)}tr:hover td{background:var(--alt)}
details{background:#fff;border:1px solid var(--bd);border-radius:14px;margin:12px 0;transition:box-shadow .3s,border-color .3s}
details:hover{border-color:#bcd0f7;box-shadow:0 8px 24px rgba(40,100,220,.1)}details[open]{border-color:var(--blue)}
summary{cursor:pointer;list-style:none;padding:16px 56px 16px 20px;font:700 1rem var(--hf);color:var(--navy);position:relative}summary::-webkit-details-marker{display:none}
summary::after{content:"+";position:absolute;right:16px;top:50%;margin-top:-15px;width:30px;height:30px;line-height:30px;text-align:center;border-radius:50%;background:var(--alt);color:var(--blue);font-size:1.2rem;transition:transform .3s,background .3s}
details[open] summary::after{transform:rotate(45deg);background:var(--blue);color:#fff}details p{margin:0;padding:0 20px 18px}
/* article */
.art{display:grid;grid-template-columns:minmax(0,1fr) 250px;gap:56px;padding-top:56px;padding-bottom:88px}
.prose h2{font-size:1.65rem;margin:2.2em 0 .6em;padding-left:16px;border-left:4px solid var(--teal)}.prose h2:first-child{margin-top:0}
.prose li::marker{color:var(--teal)}.prose li{margin:.3em 0}.prose a{text-underline-offset:3px}
.toc{position:sticky;top:104px;align-self:start;padding:22px;border:1px solid var(--bd);border-radius:18px;background:var(--alt);font-size:.9rem}
.toc strong{font-family:var(--hf);color:var(--navy)}.toc ul{list-style:none;margin:10px 0 0;padding:0}
.toc a{display:block;padding:6px 12px;border-left:2px solid var(--bd);color:var(--mut);text-decoration:none;line-height:1.4;transition:all .2s}.toc a:hover,.toc a.on{color:var(--blue);border-color:var(--blue);background:#fff}
/* forms */
label{display:block;font:700 .9rem var(--hf);color:var(--navy);margin:18px 0 6px}
input,textarea{width:100%;padding:14px 16px;border:1.5px solid var(--bd);border-radius:12px;font:inherit;background:#fff;color:var(--text);transition:border-color .25s,box-shadow .25s}
input:focus,textarea:focus{outline:0;border-color:var(--blue);box-shadow:0 0 0 4px rgba(40,100,220,.15)}
.err{color:#c0392b;font-size:.85rem;min-height:1.3em}.hp{position:absolute;left:-9999px}
/* footer */
footer{position:relative;background:#0b1626;color:#a9b9d0;padding:72px 0 28px;font-size:.93rem}
footer::before{content:"";position:absolute;top:0;left:0;right:0;height:3px;background:linear-gradient(90deg,var(--blue),var(--teal))}
.fg{display:grid;gap:40px;grid-template-columns:1.4fr 1fr 1fr 1.2fr}footer h3{color:#fff;font-size:1rem;margin:0 0 16px}footer .logo{color:#fff;margin-bottom:14px}
footer ul{list-style:none;margin:0;padding:0}footer li{margin:9px 0}footer p{margin:0}footer a{color:#a9b9d0;text-decoration:none;display:inline-block;transition:color .2s,transform .2s}footer a:hover{color:#fff;transform:translateX(5px)}
.fb{margin-top:48px;padding-top:22px;border-top:1px solid rgba(255,255,255,.1);font-size:.85rem}
#tp{position:fixed;right:22px;bottom:22px;width:48px;height:48px;border-radius:50%;border:0;background:linear-gradient(135deg,var(--blue),var(--teal));color:#fff;font-size:1.3rem;cursor:pointer;box-shadow:0 10px 24px rgba(40,100,220,.4);opacity:0;transform:translateY(20px);pointer-events:none;transition:opacity .3s,transform .3s;z-index:60}
#tp.show{opacity:1;transform:none;pointer-events:auto}#tp:hover{transform:translateY(-4px)}
/* reveal */
@media(max-width:1240px){#mb{display:flex}.cta{display:none}
 nav{position:absolute;left:0;right:0;top:100%;background:#fff;box-shadow:0 20px 40px rgba(20,36,58,.12);max-height:0;overflow:hidden;transition:max-height .4s ease;margin:0}nav.o{max-height:560px}
 nav ul{flex-direction:column;padding:12px 24px 20px}nav li.m{display:block}nav a::after{display:none}nav a{padding:13px 12px}}
@media(max-width:980px){.hg{grid-template-columns:1fr}.heroart{max-width:380px;margin:0 auto}.art{grid-template-columns:1fr}.toc{display:none}.fg{grid-template-columns:1fr 1fr}}
@media(max-width:640px){section.s{padding:64px 0}.hero{padding:64px 0 64px}.bar{height:66px}.fg{grid-template-columns:1fr}.flow i{display:none}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important;scroll-behavior:auto!important}.js .rv:not(.in){opacity:1}}

/* ===== v2 interactive components ===== */
@keyframes fi{from{opacity:0;transform:translateY(8px)}}
.sub{text-align:center;max-width:640px;margin:14px auto 0!important;color:var(--mut)}
/* journey simulator */
.sim{background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.16);border-radius:22px;overflow:hidden;-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);box-shadow:0 30px 70px rgba(0,0,0,.4)}
.sim-top{display:flex;align-items:center;gap:6px;padding:12px 14px;background:rgba(0,0,0,.25)}
.sim-top i{width:10px;height:10px;border-radius:50%;background:#ff6b6b}.sim-top i:nth-child(2){background:#ffd166}.sim-top i:nth-child(3){background:#4fe0cd}
.sim-url{flex:1;min-width:0;margin-left:8px;padding:5px 12px;border-radius:8px;background:rgba(255,255,255,.08);font:.72rem ui-monospace,Menlo,monospace;color:#bcd2f5;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.sim-track{position:relative;display:flex;padding:26px 10px 8px}
.sim-line{position:absolute;left:12.5%;right:12.5%;top:44px;height:3px;background:rgba(255,255,255,.14);border-radius:3px}
.sim-line b{display:block;height:100%;width:0;background:linear-gradient(90deg,#7fb0ff,#4fe0cd);border-radius:3px;transition:width .7s cubic-bezier(.2,.7,.2,1)}
.pk{position:absolute;top:37px;left:12.5%;width:16px;height:16px;margin-left:-8px;border-radius:50%;background:#fff;box-shadow:0 0 0 6px rgba(79,224,205,.3),0 0 20px #4fe0cd;transition:left .7s cubic-bezier(.2,.7,.2,1)}
.sn{flex:1;position:relative;z-index:1;background:none;border:0;color:#aebfd9;font:600 .74rem var(--hf);cursor:pointer;padding:0 2px 10px}
.sn span{display:grid;place-items:center;width:38px;height:38px;margin:0 auto 10px;border-radius:50%;background:#1a2f52;border:2px solid rgba(255,255,255,.2);font-size:.9rem;color:#fff;transition:all .3s}
.sn:hover span,.sn.on span{background:var(--blue);border-color:#7fb0ff;transform:scale(1.14)}.sn.on,.sn:hover{color:#fff}
.sim-body{padding:6px 22px 14px;min-height:196px}
.sim-body h3{color:#fff;margin:0 0 6px;font-size:1.1rem;display:flex;justify-content:space-between;gap:10px;align-items:center}
.stt{font:600 .7rem Inter,sans-serif;font-style:normal;padding:3px 10px;border-radius:99px;background:rgba(79,224,205,.16);color:#7fe9d9;white-space:nowrap}
.sim-body p{margin:0 0 12px;font-size:.9rem;line-height:1.6;color:#c3d1e6}
.cp{position:relative;display:inline-block;margin:0 8px 8px 0;padding:6px 12px;border-radius:99px;background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.18);color:#e5eefc;font-size:.78rem;line-height:1.4;cursor:help;transition:background .2s}
.cp:hover,.cp:focus{background:rgba(79,224,205,.25);outline:0}
.cp::after{content:attr(data-tip);position:absolute;left:0;bottom:calc(100% + 8px);width:max-content;max-width:230px;padding:9px 12px;border-radius:10px;background:#fff;color:var(--navy);font:500 .76rem/1.45 Inter,sans-serif;box-shadow:0 12px 30px rgba(0,0,0,.3);opacity:0;transform:translateY(6px);pointer-events:none;transition:opacity .2s,transform .2s;z-index:5}
.cp:nth-child(n+2)::after{left:auto;right:0}.cp:first-child::after{left:0;right:auto}
.cp:hover::after,.cp:focus::after{opacity:1;transform:none}
.sim-foot{display:flex;justify-content:space-between;align-items:center;gap:10px;padding:10px 18px;border-top:1px solid rgba(255,255,255,.1);font-size:.72rem;color:#8fa5c6}
.mini{background:rgba(255,255,255,.12);border:0;color:#fff;border-radius:8px;padding:5px 14px;cursor:pointer;font:600 .74rem Inter,sans-serif}.mini:hover{background:rgba(255,255,255,.22)}
/* two-column intro */
.two{display:grid;grid-template-columns:1fr 1fr;gap:44px;align-items:start}.tx p{margin:0 0 1em}.two .mkw{margin:0;position:sticky;top:100px}
/* timeline */
.tl{list-style:none;margin:0 auto;padding:0;max-width:820px;position:relative}
.tl::before{content:"";position:absolute;left:23px;top:10px;bottom:30px;width:3px;border-radius:3px;background:linear-gradient(var(--blue),var(--teal))}
.tl li{position:relative;padding:0 0 28px 76px;cursor:pointer;outline-offset:6px;border-radius:10px}
.tl .dot{position:absolute;left:0;top:0;width:48px;height:48px;border-radius:50%;display:grid;place-items:center;background:#fff;border:3px solid var(--blue);font:800 1rem var(--hf);color:var(--blue);transition:all .3s}
.tl li:hover .dot,.tl li:focus .dot,.tl li.open .dot{background:var(--blue);color:#fff;transform:scale(1.12);box-shadow:0 0 0 8px rgba(40,100,220,.15)}
.home .s .tl h3{margin:0 0 4px;font-size:1.2rem;transition:color .25s}.tl li:hover h3{color:var(--blue)}.tl p{margin:0}
/* concept explorer */
.cx{display:grid;grid-template-columns:310px 1fr;gap:30px;align-items:start}
.cxl{display:flex;flex-direction:column;gap:6px}
.cxl button{display:flex;align-items:center;gap:12px;text-align:left;padding:12px 16px;border:1px solid var(--bd);border-radius:14px;background:#fff;font:600 .95rem var(--hf);color:var(--navy);cursor:pointer;transition:all .28s}
.cxl button span{display:grid;place-items:center;flex:none;width:30px;height:30px;border-radius:9px;background:var(--alt);color:var(--blue);font-size:.75rem;font-weight:800;transition:all .28s}
.cxl button:hover{transform:translateX(6px);border-color:#bcd0f7}
.cxl button.on{background:linear-gradient(135deg,#14243A,#2864DC);color:#fff;border-color:transparent;transform:translateX(10px);box-shadow:0 14px 30px rgba(40,100,220,.3)}
.cxl button.on span{background:rgba(255,255,255,.2);color:#fff}
.pn{display:none;background:#fff;border:1px solid var(--bd);border-radius:22px;padding:34px;box-shadow:0 20px 50px rgba(20,36,58,.1)}.pn.on{display:block}
.home .s .pn h3{margin:0 0 20px;font-size:1.55rem}
.b{padding:16px 18px;border-radius:14px;margin-bottom:12px;border-left:4px solid;font-size:.97rem}.b:last-child{margin-bottom:0}
.b strong{display:block;font:700 .72rem var(--hf);letter-spacing:.09em;text-transform:uppercase;margin-bottom:4px;color:var(--navy)}
.w1{background:#eef4ff;border-color:var(--blue)}.w2{background:#e9f7f5;border-color:var(--teal)}.w3{background:#fff4e5;border-color:#e69a2e}
/* mockups */
.mkw{background:#fff;border:1px solid var(--bd);border-radius:18px;overflow:hidden;box-shadow:0 20px 50px rgba(20,36,58,.12);margin:28px 0}
.mkbar{display:flex;gap:6px;align-items:center;padding:11px 14px;background:#eef2f8;border-bottom:1px solid var(--bd);font:600 .78rem var(--hf);color:var(--mut)}
.mkbar i{width:10px;height:10px;border-radius:50%;background:#ff6b6b}.mkbar i:nth-child(2){background:#ffd166}.mkbar i:nth-child(3){background:#3ecf8e}.mkbar span{margin-left:10px}
.mkbody{padding:20px}.cap{margin:0;padding:10px 16px;font-size:.78rem;color:var(--mut);background:var(--alt);border-top:1px solid var(--bd)}
.mkx{margin-top:32px}.mkx .mkw{max-width:780px;margin:0 auto}
.u{font:.93rem/2.1 ui-monospace,Menlo,Consolas,monospace;word-break:break-all}
.up{padding:3px 2px;border-radius:6px;cursor:pointer;transition:background .2s,box-shadow .2s}
.up[data-k="0"],.up[data-k="4"]{color:#6b7a90}.up[data-k="1"]{color:#1d4fb8}.up[data-k="2"]{color:#0f8a7d}.up[data-k="3"]{color:#b06a00}.up[data-k="5"]{color:#7b3fc4}
.up:hover,.up.on,.up:focus{background:#eef4ff;box-shadow:0 0 0 2px #bcd0f7;outline:0}
.uinfo{margin-top:14px;padding:14px 16px;border-radius:12px;background:var(--alt);font-size:.9rem;min-height:96px}.uinfo b{color:var(--navy);font-family:var(--hf)}.uinfo p{margin:4px 0 0}
.hop{display:flex;align-items:center;gap:12px;width:100%;padding:12px 14px;margin-bottom:8px;border:1px solid var(--bd);border-radius:12px;background:#fff;cursor:pointer;font:.82rem ui-monospace,Menlo,monospace;color:var(--text);text-align:left;transition:all .25s}
.hop span{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.hop small{color:var(--mut)}
.hop:hover,.hop.on{border-color:var(--blue);background:#eef4ff;transform:translateX(5px)}
.st{font-style:normal;font-weight:700;padding:3px 9px;border-radius:7px;color:#fff;background:#e69a2e}.st.ok{background:var(--teal)}
.pill{padding:2px 10px;border-radius:99px;background:#e9f7f5;color:#0f8a7d;font-size:.78rem;font-weight:600;white-space:nowrap}.pill.warn{background:#fdecea;color:#c0392b}
/* tiles */
.tiles{grid-template-columns:repeat(3,1fr)}.tiles .tile:first-child{grid-column:span 2}
.tile{position:relative;overflow:hidden;display:flex;flex-direction:column;min-height:190px;padding:28px;background:#fff;border:1px solid var(--bd);border-radius:22px;color:var(--text);text-decoration:none;transition:transform .35s cubic-bezier(.2,.7,.2,1),box-shadow .35s,border-color .35s}
.tile::before{content:"";position:absolute;inset:0;background:radial-gradient(420px circle at var(--mx,50%) var(--my,50%),rgba(40,100,220,.16),transparent 60%);opacity:0;transition:opacity .3s}
.tile:hover{transform:translateY(-6px);border-color:#9db9f2;box-shadow:0 24px 50px rgba(40,100,220,.18)}.tile:hover::before{opacity:1}
.tile>*{position:relative}.home .s .tile h3{margin:0 0 8px;font-size:1.25rem}.tile p{margin:0;color:var(--mut)}
.go{margin-top:auto;padding-top:18px;font:700 .92rem var(--hf);color:var(--blue);transition:letter-spacing .3s,transform .3s}.tile:hover .go{transform:translateX(8px)}
/* checklist */
@media(max-width:980px){.two{grid-template-columns:1fr}.two .mkw{position:static}.cx{grid-template-columns:1fr}.cxl{flex-direction:row;overflow-x:auto;padding-bottom:8px}.cxl button{white-space:nowrap;transform:none!important}.tiles{grid-template-columns:1fr 1fr}}
@media(max-width:640px){.tiles{grid-template-columns:1fr}.tiles .tile:first-child{grid-column:auto}.pn{padding:22px}}

/* ===== v3 refinements ===== */
.tl li{cursor:default}.tl .d{margin-top:6px!important;color:var(--mut);font-size:.95rem}
/* concept explorer: compact list, panel stays in view */
.cxl{gap:4px}.cxl button{padding:10px 14px;font-size:.92rem}.cxl button:hover{transform:translateX(4px)}.cxl button.on{transform:translateX(6px)}
.cxp{position:sticky;top:100px}
/* guide tiles: topic chips + colour fill that expands from the cursor */
.tile h3,.tile p{transition:color .3s}
.tp{list-style:none;display:flex;flex-wrap:wrap;gap:6px;margin:16px 0 0;padding:0}
.tp li{margin:0;padding:4px 11px;border-radius:99px;background:var(--alt);border:1px solid var(--bd);font-size:.76rem;color:var(--mut);transition:all .3s}
.tile::before{content:"";position:absolute;inset:0;background:linear-gradient(135deg,#14243A 0%,#2864DC 70%,#27A89A 130%);opacity:1;clip-path:circle(0 at var(--mx,50%) var(--my,50%));transition:clip-path .65s cubic-bezier(.2,.7,.2,1)}
.tile:hover{border-color:transparent;box-shadow:0 26px 54px rgba(40,100,220,.3)}
.tile:hover::before{opacity:1;clip-path:circle(160% at var(--mx,50%) var(--my,50%))}
.tile:hover h3{color:#fff}.tile:hover p{color:#dbe7ff}.tile:hover .go{color:#fff}
.tile:hover .tp li{background:rgba(255,255,255,.14);border-color:rgba(255,255,255,.28);color:#fff}
/* checklist */
.ck{background:#fff;border:1px solid var(--bd);border-radius:20px;padding:26px;box-shadow:0 10px 30px rgba(20,36,58,.06);margin:20px 0}
.ckp{display:flex;align-items:center;gap:16px;margin-bottom:20px}
.ckbar{flex:1;height:6px;border-radius:6px;background:var(--bd);overflow:hidden}
.ckbar b{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--blue),var(--teal));border-radius:6px;transition:width .4s}
.ckn{font:700 .85rem var(--hf);color:var(--navy);white-space:nowrap}
.ck ul{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}
.ck li{display:flex;margin:0}
.ck label{flex:1;display:flex;align-items:center;gap:14px;margin:0;min-height:64px;padding:14px 16px;border:1px solid var(--bd);border-radius:14px;background:#fff;cursor:pointer;font:500 .95rem/1.45 Inter,sans-serif;color:var(--text);transition:border-color .25s,background .25s}
.ck label:hover{border-color:#bcd0f7;background:#f7faff}
.ck label:has(input:checked){background:#eefaf8;border-color:#9fdcd3}
.ck input{-webkit-appearance:none;appearance:none;flex:none;position:relative;width:24px;height:24px;margin:0;padding:0;border:2px solid #c3cfe0;border-radius:8px;background:#fff;box-shadow:none;cursor:pointer;transition:background .2s,border-color .2s}
.ck input:checked{background:var(--teal);border-color:var(--teal)}
.ck input:checked::after{content:"";position:absolute;left:6px;top:2px;width:6px;height:11px;border:solid #fff;border-width:0 2.5px 2.5px 0;transform:rotate(45deg)}
.ck input:focus-visible{outline:3px solid var(--teal);outline-offset:2px}
@media(max-width:980px){.cxp{position:static}}
@media(max-width:640px){.ck ul{grid-template-columns:1fr}}

/* ===== responsive hardening ===== */
html{-webkit-text-size-adjust:100%}
.prose,.tx,.cxp,.hg>*,.two>*,.art>*,.cx>*{min-width:0}
.grid{grid-template-columns:repeat(auto-fit,minmax(min(250px,100%),1fr))}
.hg{grid-template-columns:minmax(0,1.15fr) minmax(0,.85fr)}
.two{grid-template-columns:minmax(0,1fr) minmax(0,1fr)}
.cx{grid-template-columns:310px minmax(0,1fr)}
.fg{grid-template-columns:minmax(0,1.4fr) minmax(0,1fr) minmax(0,1fr) minmax(0,1.2fr)}
.tiles{grid-template-columns:repeat(3,minmax(0,1fr))}
.cp::after,.cp:nth-child(n+2)::after,.cp:first-child::after{left:var(--tl,0px);right:auto;max-width:min(230px,calc(100vw - 60px))}
@media(max-width:980px){
 .hg,.two,.cx,.art{grid-template-columns:minmax(0,1fr)}
 .tiles,.fg{grid-template-columns:repeat(2,minmax(0,1fr))}
 .sim{max-width:560px;margin:0 auto;width:100%}
}
@media(max-width:640px){
 .w{padding:0 18px}
 .tiles,.fg,.ck ul{grid-template-columns:minmax(0,1fr)}
 .tiles .tile:first-child{grid-column:auto}
 .hero .acts .btn{display:flex;justify-content:center;margin-right:0;width:100%}
 .flow{flex-direction:column;align-items:stretch;gap:6px}.flow div{flex:none}
 .flow i{display:block;text-align:center;transform:rotate(90deg);animation:none}
 .prose h2{font-size:1.4rem}.home section.s h2{font-size:1.7rem}
 .prose table{display:block;overflow-x:auto}
 .art{padding-top:36px;padding-bottom:56px}.phero{padding:44px 0 52px}
 .tile{padding:22px}.pn{padding:20px}.ck{padding:18px}.mkbody{padding:14px}
 .sim-body{padding:6px 16px 12px}.sim-foot{padding:10px 14px}
 #tp{right:14px;bottom:14px}
 .tl::before{left:19px}.tl li{padding-left:62px}.tl .dot{width:40px;height:40px;font-size:.9rem}
}