/* kaibuiltthis.com home page. Tokens follow the channel's design language (brand/tokens.css in the OS repo):
   light grey desk, white surfaces, one lime accent that is only ever a fill. Kit pages keep /style.css. */
@font-face{font-family:"Jersey 15";src:url(/assets/fonts/jersey15-latin.woff2) format("woff2");font-display:swap}

:root{
  --paper:#F0F0F0;--paper-2:#E6E6E6;--surface:#FFFFFF;--surface-2:#F7F7F8;
  --ink:#111113;--ink-2:#55565C;--ink-3:#8E8E93;
  --line:rgba(0,0,0,.08);--line-2:rgba(0,0,0,.14);
  --lime:#C5F23C;--lime-soft:rgba(197,242,60,.28);
  --glass:rgba(255,255,255,.62);--glass-edge:rgba(255,255,255,.8);
  --bar:rgba(240,240,240,.72);
  --sh-rest:0 0 0 .5px rgba(20,22,40,.10),0 1px 2px rgba(20,22,40,.06),0 4px 8px -2px rgba(20,22,40,.06),0 16px 28px -8px rgba(20,22,40,.10),0 48px 80px -20px rgba(20,22,40,.14);
  --sh-lift:0 0 0 .5px rgba(20,22,40,.10),0 2px 4px rgba(20,22,40,.06),0 8px 16px -4px rgba(20,22,40,.08),0 28px 48px -12px rgba(20,22,40,.16),0 80px 120px -30px rgba(20,22,40,.24);
  --sh-win:0 0 0 .5px rgba(0,0,0,.22),0 1px 2px rgba(0,0,0,.08),0 12px 24px -6px rgba(0,0,0,.14),0 40px 80px -20px rgba(20,22,40,.28),0 90px 140px -40px rgba(20,22,40,.30);
  --focus:#111113;
  --font:Inter,ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  --mono:"Geist Mono",ui-monospace,SFMono-Regular,Menlo,monospace;
  --px:"Jersey 15",var(--font);
  --gut:clamp(16px,4vw,48px);
}
@media (prefers-color-scheme:dark){:root{
  --paper:#161618;--paper-2:#1C1C1F;--surface:#1E1E21;--surface-2:#252529;
  --ink:#F2F2F2;--ink-2:#B4B4BA;--ink-3:#8E8E93;
  --line:rgba(255,255,255,.10);--line-2:rgba(255,255,255,.16);
  --lime-soft:rgba(197,242,60,.14);
  --glass:rgba(40,40,44,.62);--glass-edge:rgba(255,255,255,.12);
  --bar:rgba(22,22,24,.72);
  --sh-rest:0 0 0 .5px rgba(255,255,255,.08),0 4px 8px -2px rgba(0,0,0,.4),0 16px 28px -8px rgba(0,0,0,.45),0 48px 80px -20px rgba(0,0,0,.5);
  --sh-lift:0 0 0 .5px rgba(255,255,255,.12),0 8px 16px -4px rgba(0,0,0,.45),0 28px 48px -12px rgba(0,0,0,.55),0 80px 120px -30px rgba(0,0,0,.6);
  --sh-win:0 0 0 .5px rgba(255,255,255,.14),0 12px 24px -6px rgba(0,0,0,.5),0 40px 80px -20px rgba(0,0,0,.6),0 90px 140px -40px rgba(0,0,0,.6);
  --focus:#C5F23C;
}}

*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:72px}
html.lenis,html.lenis body{height:auto}
.lenis.lenis-smooth{scroll-behavior:auto!important}
body{margin:0;background:var(--paper);color:var(--ink);font:400 1.0625rem/1.55 var(--font);letter-spacing:-.01em;overflow-x:clip;-webkit-font-smoothing:antialiased}
a{color:inherit;text-underline-offset:.2em}
a:focus-visible,button:focus-visible{outline:3px solid var(--focus);outline-offset:3px;border-radius:6px}
img{max-width:100%}
.skip{position:absolute;left:-999px;top:0;background:var(--lime);color:#111;padding:.6rem 1rem;z-index:50}
.skip:focus{left:0}

/* type */
h1,h2,h3{font-weight:800;letter-spacing:-.035em;line-height:1.02;margin:0}
h1{font-size:clamp(2.5rem,5.4vw,4.4rem)}
h2{font-size:clamp(2rem,4.6vw,3.6rem)}
h3{font-size:1.25rem;letter-spacing:-.02em}
.block{background:var(--lime);color:#111;padding:0 .14em;display:inline-block;border-radius:.06em;box-decoration-break:clone;-webkit-box-decoration-break:clone}
.kick{font-weight:600;font-size:.9375rem;color:var(--ink-2);margin:0 0 1rem;letter-spacing:0}
.lead{font-size:clamp(1.125rem,1.6vw,1.3rem);color:var(--ink-2);margin:1.4rem 0 2rem;max-width:34rem}
.muted{color:var(--ink-2)}
.small{font-size:.9375rem}
.wide{max-width:42rem;margin:1.25rem 0 0}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;background:var(--lime);color:#111;font-weight:700;text-decoration:none;padding:.95rem 1.5rem;border-radius:14px;border:1px solid rgba(0,0,0,.35);box-shadow:0 1px 0 rgba(255,255,255,.6) inset,0 6px 16px -6px rgba(120,160,0,.55);transition:transform .2s cubic-bezier(.2,.8,.2,1),box-shadow .2s;white-space:nowrap}
.btn:hover{transform:translateY(-1px);box-shadow:0 1px 0 rgba(255,255,255,.6) inset,0 10px 22px -8px rgba(120,160,0,.6)}
.btn:active{transform:scale(.97);transition-duration:.08s}
.btn-ghost{background:transparent;color:var(--ink);border:2px solid var(--ink);box-shadow:none}
.btn-ghost:hover{background:var(--lime-soft);box-shadow:none}
.btn-sm{padding:.5rem .9rem;border-radius:10px;font-size:.9375rem;box-shadow:none}
.btn-lg{font-size:1.2rem;padding:1.15rem 2rem;border-radius:16px}
.cta-row{display:flex;flex-wrap:wrap;gap:.75rem;margin:0}
.cta-row.center{justify-content:center}

/* header: a translucent toolbar the page scrolls under */
.bar{position:sticky;top:0;z-index:40;background:var(--bar);-webkit-backdrop-filter:blur(20px) saturate(180%);backdrop-filter:blur(20px) saturate(180%);border-bottom:1px solid var(--line)}
.bar-in{max-width:76rem;margin:0 auto;padding:.7rem var(--gut);display:flex;align-items:center;justify-content:space-between;gap:1rem}
.brand img{display:block;height:34px;width:auto}
.bar nav{display:flex;align-items:center;gap:1.25rem}
.nav-l{text-decoration:none;font-weight:600;font-size:.9375rem;color:var(--ink-2)}
.nav-l:hover{color:var(--ink)}
@media (max-width:640px){.nav-l{display:none}.brand img{height:28px}}

/* 1. hero */
.hero{position:relative;max-width:76rem;margin:0 auto;padding:clamp(2rem,6vw,4rem) var(--gut) 3rem;display:grid;gap:1rem;align-items:center;min-height:calc(100svh - 58px)}
.hero-copy{position:relative;z-index:2}
.stage{position:relative;width:min(88vw,30rem);aspect-ratio:1;justify-self:center;perspective:1200px}
.stage-in{position:absolute;inset:0;transform-style:preserve-3d}
.poster,.poster img{position:absolute;inset:6%;width:88%;height:88%;display:block;transition:opacity .7s ease}
.poster img{inset:0;width:100%;height:100%}
.stage canvas{position:absolute;inset:0;width:100%!important;height:100%!important;opacity:0;transition:opacity .7s ease;touch-action:pan-y}
.stage.live canvas{opacity:1}
.stage.live .poster{opacity:0}
.floor{position:absolute;left:14%;right:14%;bottom:-2%;height:12%;border-radius:50%;background:radial-gradient(closest-side,rgba(20,22,40,.22),rgba(20,22,40,0));filter:blur(6px);transform:translateZ(-1px)}
.scroll-hint{position:absolute;left:50%;bottom:1.25rem;transform:translateX(-50%);margin:0;font-size:.8125rem;font-weight:600;color:var(--ink-3);display:flex;flex-direction:column;align-items:center;gap:.4rem}
.scroll-hint span{width:1px;height:28px;background:linear-gradient(var(--ink-3),transparent)}
.motion .scroll-hint span{animation:hint 2.2s cubic-bezier(.4,0,.2,1) infinite;transform-origin:top}
@keyframes hint{0%{transform:scaleY(0)}50%{transform:scaleY(1)}100%{transform:scaleY(1);opacity:0}}
@media (min-width:900px){
  .hero{grid-template-columns:1.15fr .95fr;gap:2rem}
  .stage{width:100%;max-width:36rem}
}
@media (max-width:899px){.scroll-hint{display:none}.hero{min-height:auto}}

/* 2. the build */
.build{position:relative}
.build-pin{max-width:76rem;margin:0 auto;padding:4rem var(--gut);display:grid;gap:2.5rem;align-items:center}
.steps{list-style:none;margin:1.75rem 0 0;padding:0;display:grid;gap:.9rem;max-width:30rem}
.steps li{padding:1rem 1.1rem;border-radius:16px;border:1px solid transparent;color:var(--ink-2);transition:background .4s,border-color .4s,color .4s,transform .4s cubic-bezier(.2,.8,.2,1)}
.steps li b{display:block;color:var(--ink);font-size:1.125rem;letter-spacing:-.02em;margin-bottom:.15rem}
.steps li.on{background:var(--surface);border-color:var(--line);box-shadow:var(--sh-rest);color:var(--ink)}
html:not(.motion) .steps li{background:var(--surface);border-color:var(--line)}

.scene{position:relative;perspective:1800px;perspective-origin:50% 40%}
.win{position:relative;width:100%;aspect-ratio:16/11;background:var(--surface);border-radius:12px;box-shadow:var(--sh-win);overflow:hidden;transform-origin:50% 60%;display:flex;flex-direction:column;will-change:transform}
.win-bar{flex:none;height:44px;display:flex;align-items:center;gap:.9rem;padding:0 .9rem;background:rgba(246,246,246,.8);border-bottom:1px solid var(--line);position:relative}
@media (prefers-color-scheme:dark){.win-bar{background:rgba(40,40,44,.85)}}
.lights{display:flex;gap:7px}.lights i{width:12px;height:12px;border-radius:50%;background:#FF5F57;box-shadow:inset 0 0 0 .5px rgba(0,0,0,.18)}
.lights i:nth-child(2){background:#FEBC2E}.lights i:nth-child(3){background:#28C840}
.chev{color:var(--ink-3);font-size:1.1rem;letter-spacing:.2em}
.addr{position:absolute;left:50%;transform:translateX(-50%);background:var(--surface-2);border:1px solid var(--line);border-radius:8px;padding:.22rem 1rem;font:500 .8125rem/1.3 var(--font);color:var(--ink-2);white-space:nowrap}
.win-body{flex:1;display:flex;min-height:0}
.side{flex:none;width:170px;background:rgba(236,236,238,.7);border-right:1px solid var(--line);padding:.9rem .6rem;display:flex;flex-direction:column;gap:.15rem;font-size:.8125rem;color:var(--ink-2)}
@media (prefers-color-scheme:dark){.side{background:rgba(30,30,33,.9)}}
.side-h{font-size:.6875rem;font-weight:700;text-transform:uppercase;letter-spacing:.06em;color:var(--ink-3);padding:.2rem .5rem .4rem}
.side span:not(.side-h){padding:.35rem .5rem;border-radius:7px}
.side .on{background:var(--lime);color:#111;font-weight:700}
.canvas{flex:1;position:relative;background:var(--paper);padding:5% 6% 0;display:flex;flex-direction:column;min-width:0}
.mini{flex:1;background:var(--surface);border-radius:10px 10px 0 0;border:1px solid var(--line);border-bottom:0;padding:4% 6%;display:flex;flex-direction:column;gap:7%;overflow:hidden}
.m-nav{display:flex;align-items:center;gap:6px}
.m-logo{width:24%;height:10px;border-radius:4px;background:var(--ink)}
.m-dot{width:9%;height:6px;border-radius:3px;background:var(--line-2);margin-left:auto}
.m-dot+.m-dot{margin-left:0}
.m-pill{width:13%;height:12px;border-radius:5px;background:var(--lime);border:1px solid rgba(0,0,0,.3)}
.m-head{display:flex;flex-direction:column;gap:8px}
.m-line{display:block;width:var(--w);height:clamp(12px,2.2vw,22px);border-radius:4px;background:var(--ink)}
.m-lime{background:var(--lime);border:1px solid rgba(0,0,0,.25)}
.m-text{display:block;width:var(--w);height:7px;border-radius:3px;background:var(--line-2);margin-top:4px}
.m-btn{display:block;width:26%;height:clamp(14px,2.4vw,24px);border-radius:6px;background:var(--lime);border:1px solid rgba(0,0,0,.3);margin-top:6px}
.m-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:6%}
.m-card{display:block;aspect-ratio:4/3;background:var(--surface);border:1px solid var(--line);border-radius:8px;box-shadow:0 1px 2px rgba(0,0,0,.06),0 8px 16px -8px rgba(20,22,40,.18);padding:8%}
.m-card b{display:inline-block;background:var(--lime);color:#111;font:600 clamp(7px,.9vw,11px)/1 var(--mono);padding:3px 5px;border-radius:4px}
.composer{position:relative;margin:4% 0 5%;background:var(--surface);border:1px solid var(--line-2);border-radius:14px;padding:.7rem 3rem .7rem 1rem;font-size:clamp(.75rem,1.1vw,.9375rem);line-height:1.35;color:var(--ink);box-shadow:0 2px 8px -2px rgba(20,22,40,.12);min-height:3.3em}
.caret{display:inline-block;width:2px;height:1.1em;background:var(--ink);vertical-align:-.18em;margin-left:1px}
.motion .caret{animation:blink 1s steps(1) infinite}
@keyframes blink{50%{opacity:0}}
.send{position:absolute;right:.55rem;bottom:.5rem;width:1.9rem;height:1.9rem;border-radius:50%;background:var(--lime);border:1px solid rgba(0,0,0,.3)}
.send::after{content:"";position:absolute;left:50%;top:50%;width:7px;height:7px;border-left:2px solid #111;border-top:2px solid #111;transform:translate(-50%,-25%) rotate(45deg)}

.glass{background:var(--glass);-webkit-backdrop-filter:blur(24px) saturate(180%);backdrop-filter:blur(24px) saturate(180%);border:1px solid var(--glass-edge);box-shadow:var(--sh-lift)}
.result{position:absolute;right:-2%;bottom:-6%;border-radius:18px;padding:.9rem 1.2rem .9rem .9rem;display:flex;align-items:center;gap:.9rem;max-width:min(80%,22rem)}
.px{font:400 2.4rem/1 var(--px);background:var(--lime);color:#111;padding:.05em .18em .1em;border-radius:6px;letter-spacing:.02em}
.r-t{font-size:.9375rem;line-height:1.35;color:var(--ink-2)}
.r-t b{color:var(--ink)}

@media (min-width:900px){
  .build-pin{grid-template-columns:.8fr 1.2fr;gap:4rem}
  .motion .build-pin{min-height:100svh;padding-top:5rem;padding-bottom:4rem}
}
@media (max-width:899px){
  /* phone: steps stack in one cell and swap, so the pinned scene fits a screen */
  .motion .build-pin{min-height:100svh;padding-top:4.75rem;padding-bottom:2rem;gap:1.5rem;align-content:center}
  .motion .build-copy h2{font-size:clamp(1.8rem,8vw,2.4rem)}
  .motion .build-copy .kick{margin-bottom:.6rem}
  .motion .steps{display:grid;margin-top:1rem}
  .motion .steps li{grid-area:1/1;opacity:0;transform:translateY(8px)}
  .motion .steps li.on{opacity:1;transform:none}
  .side{display:none}
  .win{aspect-ratio:1}
  .result{right:2%;bottom:-5%}
  .px{font-size:1.9rem}
}

/* 3. kits */
.sec-in{max-width:76rem;margin:0 auto;padding:0 var(--gut)}
.kits{padding:clamp(4rem,10vw,8rem) 0 4rem}
.kit-grid{list-style:none;margin:2.5rem 0 0;padding:0;display:grid;gap:1.25rem;perspective:1400px}
.kit a{position:relative;display:flex;flex-direction:column;gap:.5rem;height:100%;padding:1.1rem 1.1rem 1.25rem;background:var(--surface);border-radius:20px;text-decoration:none;box-shadow:var(--sh-rest);transition:transform .45s cubic-bezier(.2,.8,.2,1),box-shadow .45s cubic-bezier(.2,.8,.2,1);transform:translateZ(0)}
.kit a:hover,.kit a:focus-visible{transform:translateY(-6px);box-shadow:var(--sh-lift)}
.kit a:active{transform:translateY(-2px) scale(.99);transition-duration:.1s}
.ep{display:inline-block;align-self:flex-start;background:var(--lime);color:#111;font:600 .8125rem/1 var(--mono);padding:.4rem .55rem;border-radius:7px;flex:none}
.kit-art{display:flex;flex-direction:column;justify-content:center;gap:8px;height:140px;margin:.5rem 0 .6rem;padding:1rem 1.1rem;background:var(--paper);border-radius:14px;border:1px solid var(--line);overflow:hidden}
.ka-bubble{display:block;width:62%;height:18px;border-radius:9px 9px 9px 3px;background:var(--surface);box-shadow:0 1px 2px rgba(0,0,0,.06)}
.ka-bubble.r{align-self:flex-end;width:48%;background:var(--lime);border-radius:9px 9px 3px 9px}
.ka-row{display:flex;align-items:center;justify-content:space-between;height:22px;padding:0 8px;border-radius:7px;background:var(--surface)}
.ka-row::before{content:"";width:44%;height:6px;border-radius:3px;background:var(--line-2)}
.ka-row b{width:26px;height:14px;border-radius:7px;background:var(--line-2);position:relative}
.ka-row b::after{content:"";position:absolute;left:2px;top:2px;width:10px;height:10px;border-radius:50%;background:var(--surface)}
.ka-row.on b{background:var(--lime)}.ka-row.on b::after{left:14px}
.ka-file{display:block;align-self:flex-start;font:600 .75rem/1 var(--mono);background:var(--surface);border:1px solid var(--line-2);border-left:4px solid var(--lime);padding:.55rem .65rem;border-radius:7px;color:var(--ink);font-style:normal}
.kit-t{font-weight:800;font-size:1.375rem;letter-spacing:-.025em;line-height:1.1}
.kit-d{color:var(--ink-2);font-size:.9875rem}
.kit-go{margin-top:auto;padding-top:.5rem;font-weight:700}
.soon-h{margin:3.5rem 0 1rem}
.soon{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(auto-fill,minmax(10.5rem,1fr));gap:.6rem}
.soon li{display:flex;align-items:center;gap:.6rem;padding:.65rem .75rem;border-radius:12px;background:color-mix(in srgb,var(--surface) 60%,transparent);border:1px dashed var(--line-2);color:var(--ink-2);font-weight:600;font-size:.9375rem}
.soon .ep{background:var(--paper-2);color:var(--ink-2)}
@media (min-width:760px){.kit-grid{grid-template-columns:repeat(3,1fr)}}

/* 4. disclosure */
.ai{padding:3rem 0;position:relative}
.ai::before{content:"";position:absolute;left:50%;top:50%;width:min(60rem,120vw);height:22rem;transform:translate(-50%,-50%);background:radial-gradient(closest-side,var(--lime-soft),transparent);pointer-events:none}
.ai-card{position:relative;border-radius:28px;padding:clamp(1.25rem,4vw,2.5rem);display:grid;gap:1.25rem;align-items:start;max-width:56rem;margin:0 auto}
.ai-card h2{font-size:clamp(1.8rem,3.4vw,2.6rem);margin-bottom:.9rem}
.ai-card p{margin:0 0 .7rem;font-size:1.0625rem}.ai-card p:last-child{margin:0}
.ai-mark{width:72px;height:72px;display:block}
@media (min-width:640px){.ai-card{grid-template-columns:auto 1fr;gap:2rem}.ai-mark{width:96px;height:96px}}

/* 5. subscribe */
.sub{padding:clamp(4rem,10vw,8rem) 0 5rem;text-align:center}
.sub-in{display:flex;flex-direction:column;align-items:center}
.px-big{font:400 clamp(3.4rem,11vw,8.5rem)/.9 var(--px);margin:0 0 1.75rem;letter-spacing:.01em}
.px-big span{background:var(--lime);color:#111;padding:0 .12em .04em;border-radius:.06em}
.sub h2{font-size:clamp(1.6rem,3.4vw,2.6rem);max-width:36rem;margin-bottom:2rem}
.sub .small{max-width:32rem;margin:2rem auto 0}

footer{border-top:1px solid var(--line);padding:2rem 0 3rem;color:var(--ink-2);font-size:.9375rem}
footer p{margin:0 0 .6rem;max-width:46rem}

/* reduced motion and no JS: everything sits at rest, finished */
@media (prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important;scroll-behavior:auto!important}}
@media (prefers-reduced-transparency:reduce){.glass,.bar{background:var(--surface);-webkit-backdrop-filter:none;backdrop-filter:none}}

/* 1b. start here */
.start{padding:clamp(3.5rem,8vw,6rem) 0 1rem}
.start-grid{list-style:none;margin:2.25rem 0 0;padding:0;display:grid;gap:1.25rem;perspective:1400px;counter-reset:none}
.step-n{display:grid;place-items:center;width:3.25rem;height:3.25rem;margin-bottom:.6rem;border-radius:14px;background:var(--lime);color:#111;font:400 2.4rem/1 var(--px);border:1px solid rgba(0,0,0,.3)}
@media (min-width:760px){.start-grid{grid-template-columns:repeat(3,1fr)}}