:root{--bg:#000;--ink:#fff;--mute:#9a9a9a;--line:#262626;--panel:#0d0d0d;--sans:"Bricolage Grotesque",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif}
*{box-sizing:border-box;margin:0}
html{scroll-behavior:smooth}
body{background:var(--bg);color:var(--ink);font-family:var(--sans);line-height:1.55;-webkit-font-smoothing:antialiased}
a{color:inherit}
:focus-visible{outline:2px solid #fff;outline-offset:3px}
.wrap{max-width:1120px;margin:0 auto;padding:0 24px}
header{position:fixed;inset:0 0 auto;z-index:5;background:rgba(0,0,0,.72);backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
header .wrap{display:flex;align-items:center;justify-content:space-between;height:64px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:1.15rem;letter-spacing:-.02em;text-decoration:none}
.brand svg{width:30px;height:30px}
nav{display:flex;gap:26px;align-items:center;font-size:.95rem;color:var(--mute)}
nav a{text-decoration:none}nav a:hover{color:var(--ink)}
.btn{display:inline-block;background:var(--ink);color:#000;font-weight:600;padding:14px 26px;border-radius:999px;text-decoration:none;transition:transform .15s}
.btn:hover{transform:translateY(-2px)}
.btn.ghost{background:transparent;color:var(--ink);border:1px solid #444}
nav .btn{padding:9px 18px;font-size:.9rem}
.hero{min-height:100svh;display:flex;align-items:center;padding:110px 0 70px;position:relative;overflow:hidden}
.hero h1{font-size:clamp(3rem,10.5vw,9rem);line-height:.92;letter-spacing:-.045em;font-weight:800;max-width:11ch}
.hero p{margin:30px 0 38px;font-size:clamp(1.1rem,2.2vw,1.45rem);color:var(--mute);max-width:44ch}
.hero p b{color:var(--ink);font-weight:600}
.cta{display:flex;gap:14px;flex-wrap:wrap}
.mark{position:absolute;right:-2vw;bottom:-4vw;width:min(46vw,520px);opacity:.95}
.mark rect{transform-box:fill-box;transform-origin:center;animation:grow .9s cubic-bezier(.2,.9,.2,1) both}
.mark rect:nth-of-type(2){animation-delay:.12s}.mark rect:nth-of-type(3){animation-delay:.24s}
.mark circle{animation:drop .7s .6s cubic-bezier(.3,1.4,.5,1) both}
@keyframes grow{from{transform:scaleX(0)}}
@keyframes drop{from{opacity:0;transform:translateY(-40px)}}
@media(max-width:760px){.mark{opacity:.18;width:80vw}nav a:not(.btn){display:none}}
@media(prefers-reduced-motion:reduce){.mark rect,.mark circle{animation:none}html{scroll-behavior:auto}}
section{padding:96px 0;border-top:1px solid var(--line)}
h2{font-size:clamp(2rem,5vw,3.6rem);letter-spacing:-.035em;line-height:1.05;max-width:18ch;margin-bottom:18px}
.lead{color:var(--mute);font-size:1.15rem;max-width:52ch}
.modes{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin-top:48px}
.mode{background:var(--panel);border:1px solid var(--line);border-radius:28px;padding:40px 34px}
.mode.alt{background:#fff;color:#000}
.mode h3{font-size:2rem;letter-spacing:-.03em;margin-bottom:6px}
.mode .for{color:var(--mute);margin-bottom:22px}.mode.alt .for{color:#555}
.mode ul{list-style:none;padding:0}
.mode li{padding:11px 0;border-top:1px solid var(--line)}.mode.alt li{border-color:#ddd}
@media(max-width:760px){.modes{grid-template-columns:1fr}}
.solve{margin-top:48px;display:grid;grid-template-columns:repeat(2,1fr);gap:0;border-top:1px solid var(--line)}
.solve div{padding:30px 28px 30px 0;border-bottom:1px solid var(--line)}
.solve h3{font-size:1.35rem;letter-spacing:-.02em;margin-bottom:6px}
.solve p{color:var(--mute);max-width:40ch}
@media(max-width:760px){.solve{grid-template-columns:1fr}}
.close{text-align:center;padding:130px 0}
.close h2{margin:0 auto 18px;max-width:14ch}
.close .lead{margin:0 auto 38px}
.close .cta{justify-content:center}
footer{border-top:1px solid var(--line);padding:34px 0;color:var(--mute);font-size:.92rem}
footer .wrap{display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px}
.solve h3 a{text-decoration:none}.solve h3 a:hover{text-decoration:underline}
.page{padding:130px 0 80px}
.crumb{font-size:.9rem;color:var(--mute);margin-bottom:22px}.crumb a{text-decoration:none}.crumb a:hover{color:var(--ink)}
.page h1{font-size:clamp(2.3rem,6vw,4.2rem);line-height:1;letter-spacing:-.04em;font-weight:800;max-width:17ch;margin-bottom:24px}
.prose{max-width:66ch}
.prose h2{font-size:1.7rem;letter-spacing:-.025em;line-height:1.15;max-width:none;margin:52px 0 12px}
.prose p,.prose li{color:#cfcfcf;font-size:1.06rem}.prose p{margin-bottom:14px}.prose .lead{color:var(--ink);font-size:1.25rem;margin-bottom:22px}
.prose ul,.prose ol{padding-left:1.2em;margin:0 0 14px}.prose li{padding:5px 0}
.prose a{text-decoration:underline;text-underline-offset:3px}
.note{border:1px solid var(--line);background:var(--panel);border-radius:18px;padding:18px 22px;margin:26px 0;color:var(--mute);font-size:.97rem}
.note b{color:var(--ink)}
details{border-top:1px solid var(--line);padding:16px 0}details:last-of-type{border-bottom:1px solid var(--line)}
summary{cursor:pointer;font-weight:600;font-size:1.06rem}details p{margin:10px 0 0}
.page .cta{margin-top:40px}
dl.facts{display:grid;grid-template-columns:minmax(150px,220px) 1fr;border-top:1px solid var(--line);margin:18px 0 26px}dl.facts dt,dl.facts dd{padding:12px 0;border-bottom:1px solid var(--line);margin:0}dl.facts dt{color:var(--mute)}dl.facts dd{color:var(--ink)}@media(max-width:600px){dl.facts{grid-template-columns:1fr}dl.facts dt{border-bottom:0;padding-bottom:0}}
footer .links{display:flex;gap:22px;flex-wrap:wrap}footer a{text-decoration:none}footer a:hover{color:var(--ink)}
/* hero backdrop mark */
.hero .wrap{position:relative;z-index:1}
.hero .mark{right:auto;bottom:auto;left:50%;top:50%;width:min(96vmin,820px);opacity:.14;pointer-events:none;z-index:0;
transform:translate(calc(-50% + var(--px,0px)),calc(-50% + var(--py,0px)));transition:transform .7s cubic-bezier(.2,.8,.2,1)}
@media(max-width:760px){.hero .mark{width:120vw;opacity:.12}}
.mark circle{animation:drop .7s .6s cubic-bezier(.3,1.4,.5,1) both,float 6s 1.4s ease-in-out infinite}
@keyframes float{50%{transform:translateY(7px)}}
@media(prefers-reduced-motion:reduce){.hero .mark{transition:none}.mark circle{animation:none}}
.hero .rotor{margin:-16px 0 36px;font-size:clamp(1.1rem,2.2vw,1.45rem);color:var(--mute)}
.rotor .w{display:inline-block;color:var(--ink);font-weight:600}
.rotor .w.in{animation:wordin .45s cubic-bezier(.2,.9,.2,1)}
@keyframes wordin{from{opacity:0;transform:translateY(.55em)}}
/* guide chat */
.g-fab{position:fixed;right:20px;bottom:calc(20px + env(safe-area-inset-bottom,0px));z-index:20;display:flex;align-items:center;gap:10px;background:#fff;color:#000;border:0;border-radius:999px;padding:13px 20px;font:600 .95rem var(--sans);cursor:pointer;box-shadow:0 8px 30px rgba(0,0,0,.5)}
.g-fab svg{width:20px;height:20px}
.g-nudge{position:fixed;right:20px;bottom:calc(84px + env(safe-area-inset-bottom,0px));z-index:20;max-width:240px;background:var(--panel);border:1px solid #333;border-radius:18px;padding:12px 16px;font-size:.92rem;color:var(--ink)}
.g-panel{position:fixed;right:20px;bottom:calc(84px + env(safe-area-inset-bottom,0px));z-index:21;width:min(380px,calc(100vw - 32px));max-height:min(620px,calc(100svh - 120px));display:flex;flex-direction:column;background:var(--panel);border:1px solid #333;border-radius:24px;box-shadow:0 20px 60px rgba(0,0,0,.65);overflow:hidden}
.g-panel[hidden],.g-nudge[hidden]{display:none}
.g-head{display:flex;justify-content:space-between;align-items:center;padding:16px 18px;border-bottom:1px solid var(--line);font-weight:800;letter-spacing:-.01em}
.g-head button{background:none;border:0;color:var(--mute);font-size:1.5rem;line-height:1;cursor:pointer;padding:0 4px}
.g-head button:hover{color:var(--ink)}
.g-log{flex:1;overflow-y:auto;padding:16px 18px;display:flex;flex-direction:column;gap:10px}
.g-msg{max-width:88%;padding:10px 14px;border-radius:18px;font-size:.95rem;line-height:1.45}
.g-msg.bot{background:#1a1a1a;align-self:flex-start;border-bottom-left-radius:6px}
.g-msg.me{background:#fff;color:#000;align-self:flex-end;border-bottom-right-radius:6px}
.g-msg a{text-decoration:underline;text-underline-offset:3px}
.g-opts{display:flex;flex-wrap:wrap;gap:8px;padding:4px 18px 16px}
.g-opts button,.g-opts a{background:transparent;color:var(--ink);border:1px solid #444;border-radius:999px;padding:8px 14px;font:inherit;font-size:.88rem;cursor:pointer;text-decoration:none}
.g-opts button:hover,.g-opts a:hover{border-color:#fff}
.g-opts a.go{background:#fff;color:#000;border-color:#fff;font-weight:600}