@import url(/assets/fonts.css);
:root{--stak:#00D4FF;--stak-d:#0066FF;--vi:#8B5CF6;--gray:#C9C4B7;--g1:#F2F2F0;--g2:#E4E4E0;--ink:#0A0A0A;--ink2:#3F3F46;--mut:#6A6A7A;--grad:linear-gradient(90deg,#00D4FF,#0066FF 50%,#8B5CF6);--r:20px;--sh:0 1px 2px rgba(14,17,22,.06),0 8px 28px rgba(14,17,22,.08);
--f:"Inter Variable","Noto Sans JP Variable","Noto Sans JP","Hiragino Sans",system-ui,sans-serif;--ease:cubic-bezier(.2,.8,.2,1)}
*{box-sizing:border-box}html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;font-family:var(--f);color:var(--ink);background:var(--g1);line-height:1.75;font-feature-settings:"palt";letter-spacing:.02em;-webkit-font-smoothing:antialiased}
img{max-width:100%}a{color:var(--stak-d)}
:focus-visible{outline:3px solid var(--stak);outline-offset:3px;border-radius:6px}
.skip{position:absolute;left:-999px}.skip:focus{left:12px;top:12px;background:#fff;padding:8px 12px;z-index:99}
.wrap{max-width:1080px;margin:0 auto;padding:0 20px}.narrow{max-width:680px;margin:0 auto;padding:0 20px}
/* header */
.hd{position:sticky;top:0;z-index:50;backdrop-filter:saturate(1.4) blur(14px);-webkit-backdrop-filter:saturate(1.4) blur(14px);background:rgba(250,250,250,.88);border-bottom:1px solid rgba(14,17,22,.06)}
.hd .wrap{display:flex;align-items:center;justify-content:space-between;height:60px}
.logo{display:inline-flex;align-items:center;gap:10px;text-decoration:none;color:var(--mut);font-size:12px}
.logo .lg{height:22px;width:auto;display:block}.logo .chip{display:inline-flex}
.hd nav a{font-size:13px;color:var(--ink2);text-decoration:none;margin-left:18px}.hd nav a:hover{color:var(--stak-d)}
.hd .pbar{position:absolute;left:0;bottom:-1px;height:2px;background:var(--stak);width:0;transition:width .1s linear}
/* type */
.eyebrow{font-size:12px;font-weight:700;letter-spacing:.18em;color:var(--stak-d);text-transform:uppercase}
.h-xl{font-size:clamp(36px,8vw,76px);line-height:1.12;font-weight:900;letter-spacing:-.01em;margin:.2em 0 .3em}
.h-l{font-size:clamp(26px,5vw,40px);line-height:1.3;font-weight:800;margin:.2em 0 .5em}
.lead{font-size:clamp(15px,2.2vw,18px);color:var(--ink2);max-width:40em}
.num{font-variant-numeric:tabular-nums;font-feature-settings:"tnum";letter-spacing:-.02em}
section{padding:clamp(56px,10vw,120px) 0}
/* cards & buttons */
.card{background:#fff;border-radius:var(--r);box-shadow:var(--sh);padding:clamp(20px,4vw,32px)}
.btn{-webkit-appearance:none;appearance:none;display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:56px;padding:0 28px;border-radius:999px;border:0;font:inherit;font-weight:700;font-size:16px;cursor:pointer;text-decoration:none;transition:transform .2s var(--ease),box-shadow .2s var(--ease),background .2s}
.btn:active{transform:scale(.97)}.btn-p{background:var(--ink);color:#fff;box-shadow:0 6px 20px rgba(14,17,22,.2)}.btn-p:hover{transform:translateY(-2px);box-shadow:0 10px 28px rgba(14,17,22,.25)}
.btn-s{background:var(--grad);color:#fff}.btn-s:hover{filter:brightness(1.08);transform:translateY(-2px)}
.btn-g{background:transparent;color:var(--ink);box-shadow:inset 0 0 0 1.5px var(--g2)}.btn-g:hover{box-shadow:inset 0 0 0 1.5px var(--ink2)}
.btn.block{width:100%}.btn .arr{transition:transform .2s}.btn:hover .arr{transform:translateX(4px)}
/* reveal */
.rv{opacity:0;transform:translateY(24px);transition:opacity .8s var(--ease),transform .8s var(--ease)}.rv.in{opacity:1;transform:none}
.rv.d1{transition-delay:.08s}.rv.d2{transition-delay:.16s}.rv.d3{transition-delay:.24s}
@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}.rv{opacity:1;transform:none}}
/* quiz */
.prog{height:6px;background:var(--g2);border-radius:99px;overflow:hidden}.prog i{display:block;height:100%;width:0;background:var(--stak);border-radius:99px;transition:width .5s var(--ease)}
.qstep{animation:qin .45s var(--ease)}@keyframes qin{from{opacity:0;transform:translateX(24px)}to{opacity:1;transform:none}}
.qcount{font-size:13px;color:var(--mut);display:flex;justify-content:space-between;margin:10px 0 18px}
.qtext{font-size:clamp(20px,4vw,26px);font-weight:800;line-height:1.5;min-height:3em}
.choices{display:grid;gap:12px;margin-top:22px}.choice{min-height:60px;border-radius:16px;border:1.5px solid var(--g2);background:#fff;font:inherit;font-size:17px;font-weight:700;cursor:pointer;transition:all .2s var(--ease);color:var(--ink)}
.choice:hover{border-color:var(--stak);transform:translateY(-2px)}.choice.sel{background:var(--ink);color:#fff;border-color:var(--ink)}
/* footer */
.ft{padding:56px 0 40px;background:#FAFAFA;color:#55554f;border-top:1px solid var(--g2);font-size:13px;color:var(--mut)}
.ft .wrap{display:grid;gap:18px}.ft .lg{height:26px}
.src{font-size:12px;color:var(--mut);line-height:1.8}.src a{word-break:break-all}
.toast{position:fixed;left:50%;bottom:24px;transform:translate(-50%,120px);background:var(--ink);color:#fff;padding:12px 20px;border-radius:999px;font-size:14px;transition:transform .4s var(--ease);z-index:99}.toast.on{transform:translate(-50%,0)}
canvas.share{width:100%;height:auto;border-radius:16px;box-shadow:var(--sh);display:block}
.tag{display:inline-block;font-size:12px;font-weight:700;padding:4px 10px;border-radius:99px;background:var(--g2);color:var(--ink2)}
.grad{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.pill{display:inline-flex;align-items:center;gap:8px;font-family:"JetBrains Mono",monospace;font-size:12px;letter-spacing:.04em;color:var(--stak);border:1px solid rgba(0,212,255,.35);border-radius:999px;padding:6px 14px;background:rgba(0,212,255,.06)}
.pill:before{content:"";width:6px;height:6px;border-radius:50%;background:var(--stak);box-shadow:0 0 10px var(--stak)}
.dark{background:#0a0a0a;color:#fff}.dark .lead{color:#A8A8B8}.dark .card{background:#141420;box-shadow:0 0 0 1px rgba(255,255,255,.08)}
.glow{position:absolute;border-radius:50%;filter:blur(60px);opacity:.55;pointer-events:none}
.demo .rv{opacity:1;transform:none;transition:none}.demo *{transition:none!important}