:root{
  --ink:#101431; --ink2:#1b2150; --paper:#f2f4f7; --white:#fff;
  --text:#1a1d33; --mute:#5d6380; --line:#d9ddea;
  --signal:#ff3b5c; --blue:#2e5bff; --on-ink:#e9ecff; --on-ink-mute:#a9b0d6;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--paper);color:var(--text);
  font-family:"Hiragino Kaku Gothic ProN","Hiragino Sans","Yu Gothic UI","Yu Gothic","Meiryo",system-ui,sans-serif;
  font-size:16px;line-height:1.8}
a{color:inherit}
:focus-visible{outline:3px solid var(--signal);outline-offset:3px}
.wrap{max-width:1160px;margin:0 auto;padding:0 24px}

/* header */
.top{background:var(--ink);color:var(--on-ink)}
.top-in{display:flex;align-items:center;justify-content:space-between;height:64px}
.mark{font-weight:900;font-size:20px;letter-spacing:.14em;text-decoration:none;color:#fff}
.top nav{display:flex;gap:28px;font-size:14px}
.top nav a{text-decoration:none;color:var(--on-ink-mute)}
.top nav a:hover{color:#fff}

/* hero */
.hero{background:var(--ink);color:#fff;padding:56px 0 88px}
.hero h1{margin:0;font-weight:900;font-size:clamp(44px,9vw,120px);line-height:1.04;letter-spacing:-.02em}
.hero p{margin:28px 0 0;max-width:34em;font-size:clamp(16px,1.6vw,19px);color:var(--on-ink-mute)}

/* two doors */
.doors{position:relative;margin-top:-48px}
.doors-in{display:grid;grid-template-columns:1fr 1fr;box-shadow:0 18px 50px rgba(16,20,49,.18)}
.door{display:flex;flex-direction:column;padding:40px 40px 36px;text-decoration:none;min-height:420px;transition:transform .2s}
.door:hover{transform:translateY(-4px)}
.door .verb{font-size:15px;font-weight:700;margin:0 0 6px}
.door h2{margin:0 0 14px;font-size:clamp(26px,3.4vw,38px);line-height:1.25;font-weight:900}
.door p{margin:0 0 18px;max-width:28em}
.door ul{margin:0 0 auto;padding:0;list-style:none;font-size:15px}
.door li{padding:9px 0;border-top:1px solid currentColor;border-top-color:rgba(127,133,170,.35)}
.door .go{margin-top:28px;font-weight:800;font-size:17px}
.door-app{background:var(--white);color:var(--text)}
.door-app .verb{color:var(--blue)}
.door-app p{color:var(--mute)}
.door-lab{background:var(--ink2);color:#fff;position:relative}
.door-lab .verb{color:var(--signal)}
.door-lab p{color:var(--on-ink-mute)}
/* the seam: one red line between the two doors, drawn once on load */
.door-lab::before{content:"";position:absolute;left:0;top:0;bottom:0;width:4px;background:var(--signal);transform-origin:top;animation:draw .9s .2s ease-out both}
@keyframes draw{from{transform:scaleY(0)}to{transform:scaleY(1)}}

/* flow */
.flow{padding:84px 0 24px}
.flow h2{margin:0 0 6px;font-size:clamp(22px,3vw,30px);font-weight:900}
.flow .lead{margin:0 0 32px;color:var(--mute);max-width:36em}
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:0;border-top:2px solid var(--ink)}
.step{padding:22px 24px 8px 0}
.step b{display:block;font-size:13px;color:var(--signal);margin-bottom:4px}
.step h3{margin:0 0 6px;font-size:19px}
.step p{margin:0;color:var(--mute);font-size:15px}
.promise{margin:40px 0 0;padding:20px 24px;background:var(--white);border-left:4px solid var(--signal);max-width:46em}
.promise p{margin:0}

/* footer */
footer{margin-top:84px;background:var(--ink);color:var(--on-ink-mute);padding:36px 0;font-size:14px}
.foot{display:flex;flex-wrap:wrap;gap:16px 40px;justify-content:space-between}
.foot a{color:var(--on-ink)}
.foot nav{display:flex;gap:24px;flex-wrap:wrap}

@media (max-width:760px){
  .doors-in{grid-template-columns:1fr}
  .door{min-height:0;padding:32px 24px 28px}
  .door-lab::before{right:0;bottom:auto;width:auto;height:4px;transform-origin:left;animation-name:drawx}
  @keyframes drawx{from{transform:scaleX(0)}to{transform:scaleX(1)}}
  .steps{grid-template-columns:1fr}
  .top nav{gap:16px}
}
@media (prefers-reduced-motion:reduce){
  .door-lab::before{animation:none}
  .door{transition:none}
}
/* sub pages */
.page-head{background:var(--ink);color:#fff;padding:48px 0 56px}
.page-head h1{margin:0;font-weight:900;font-size:clamp(32px,6vw,60px);line-height:1.15;letter-spacing:-.01em}
.page-head p{margin:18px 0 0;max-width:36em;color:var(--on-ink-mute)}
.prose{padding:56px 0 0}
.prose h2{margin:44px 0 10px;font-size:clamp(20px,2.6vw,26px);font-weight:900}
.prose h2:first-child{margin-top:0}
.prose p,.prose li{max-width:40em}
.prose ul{padding-left:1.2em}
.cta-row{margin-top:28px}
.btn{display:inline-block;background:var(--signal);color:#fff;font-weight:800;text-decoration:none;padding:14px 28px}
.btn:hover{background:#e62d4d}
dl.kv{display:grid;grid-template-columns:minmax(9em,14em) 1fr;margin:0;border-top:2px solid var(--ink);max-width:48em}
dl.kv dt,dl.kv dd{margin:0;padding:14px 0;border-bottom:1px solid var(--line)}
dl.kv dt{font-weight:700;color:var(--mute);padding-right:16px}
@media (max-width:760px){dl.kv{grid-template-columns:1fr}dl.kv dt{border-bottom:0;padding-bottom:0}}
.top nav a[aria-current="page"]{color:#fff;border-bottom:2px solid var(--signal)}

/* examples */
.prose h3.group{margin:32px 0 4px;font-size:18px;font-weight:900}
.examples{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:20px;margin:14px 0 28px}
.examples.two{grid-template-columns:repeat(2,1fr)}
.ex{background:var(--white);border-top:3px solid var(--signal);padding:20px 22px}
.ex .tag{display:inline-block;font-size:12px;font-weight:700;color:var(--signal);margin-bottom:6px}
.ex h4{margin:0 0 8px;font-size:17px;line-height:1.5}
.prose .ex p{margin:0;max-width:none;font-size:15px;color:var(--mute)}
.ex-top{padding:72px 0 0}
.ex-top h2{margin:0 0 6px;font-size:clamp(22px,3vw,30px);font-weight:900}
.ex-top .lead{margin:0 0 28px;color:var(--mute);max-width:40em}
.ex-cols{display:grid;grid-template-columns:1fr 1fr;gap:28px;border-top:2px solid var(--ink);padding-top:20px}
.ex-cols h3{margin:0 0 6px;font-size:18px}
.ex-cols ul{margin:0;padding-left:1.2em;color:var(--text);font-size:15px}
.ex-links{margin:28px 0 0}
@media (max-width:760px){.examples.two,.ex-cols{grid-template-columns:1fr}.ex-top{padding-top:56px}}

/* hearing form */
.btn-sub{display:inline-block;margin-left:16px;font-weight:700;color:var(--ink)}
.hearing{max-width:40em}
.hearing .q{border:0;border-top:1px solid var(--line);margin:0;padding:22px 0 8px}
.hearing legend{font-weight:800;padding:0;margin-bottom:10px}
.hearing .opt{margin-left:10px;font-size:13px;font-weight:400;color:var(--mute)}
.hearing .choices{display:grid;gap:4px}
.hearing .choice{display:block;padding:8px 0;cursor:pointer}
.hearing .choice input{margin-right:10px;accent-color:var(--signal)}
.hearing textarea{width:100%;font:inherit;padding:12px;border:1px solid var(--line);background:#fff;color:var(--text)}
.hearing .more{margin-top:18px;border-top:1px solid var(--line)}
.hearing .more summary{cursor:pointer;font-weight:800;padding:16px 0}
.hearing .field{display:block;margin:0 0 16px;font-weight:700}
.hearing .field input{display:block;width:100%;margin-top:6px;font:inherit;font-weight:400;padding:12px;border:1px solid var(--line);background:#fff;color:var(--text)}
.hearing .note{margin:24px 0;color:var(--mute);font-size:14px}
.hearing .btn{border:0;cursor:pointer;font:inherit;font-weight:800}
@media (max-width:760px){.btn-sub{margin:16px 0 0}}