/* aihub.viva-mc.net. Same glass-over-sky look as the app (src/AIHub.Ui/css/app.css). */
:root{
  --g1:rgba(255,255,255,.10); --g2:rgba(255,255,255,.16); --g3:rgba(255,255,255,.26);
  --line:rgba(255,255,255,.28); --line2:rgba(255,255,255,.14);
  --tx:#fff; --tx2:rgba(255,255,255,.86); --tx3:rgba(255,255,255,.68);
  --ink:#1A1D2B;
  --f:'Inter Variable','Noto Sans JP Variable','Yu Gothic UI','Hiragino Sans',system-ui,sans-serif;
  --ease:cubic-bezier(.2,.8,.2,1);
  --w:1120px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:88px}
body{margin:0;font:16px/1.75 var(--f);color:var(--tx);background:#3a4266;-webkit-font-smoothing:antialiased;
  text-shadow:0 1px 2px rgba(10,14,30,.28);overflow-x:hidden}
body::before{content:"";position:fixed;inset:0;z-index:-1;
  background:linear-gradient(180deg,rgba(24,28,52,.18),rgba(24,28,52,.42) 60%,rgba(18,20,38,.62)),url(/img/sky.jpg) center/cover no-repeat}
a{color:inherit}
img{max-width:100%;height:auto;display:block}
h1,h2,h3{margin:0;font-weight:700;letter-spacing:.01em}
p{margin:0}
h1,h2,h3,p,summary,li{word-break:auto-phrase;text-wrap:pretty}
:focus-visible{outline:2px solid #fff;outline-offset:3px;border-radius:8px}
.skip{position:absolute;left:-999px;top:8px;background:#fff;color:var(--ink);padding:8px 14px;border-radius:10px;z-index:10}
.skip:focus{left:16px}

.glass{background:var(--g2);border:1px solid var(--line);backdrop-filter:blur(22px) saturate(1.3);-webkit-backdrop-filter:blur(22px) saturate(1.3)}

/* nav */
.nav{position:sticky;top:14px;z-index:5;max-width:var(--w);margin:14px auto 0;padding:8px 8px 8px 18px;display:flex;align-items:center;gap:20px;
  border-radius:999px;background:rgba(40,46,80,.32);border:1px solid var(--line);backdrop-filter:blur(22px) saturate(1.3);-webkit-backdrop-filter:blur(22px) saturate(1.3);
  box-shadow:0 10px 30px rgba(8,12,28,.18)}
.brand{display:inline-flex;align-items:center;gap:10px;font-weight:700;font-size:18px;text-decoration:none}
.brand img{border-radius:9px}
.nav nav{display:flex;gap:4px;margin-left:auto}
.nav nav a{padding:8px 14px;border-radius:999px;text-decoration:none;font-size:14px;color:var(--tx2);transition:background-color .2s}
.nav nav a:hover{background:var(--g2);color:#fff}

/* buttons */
.btn{display:inline-flex;align-items:center;gap:10px;height:54px;padding:0 26px;border-radius:999px;background:rgba(255,255,255,.94);color:var(--ink);
  font-weight:700;text-decoration:none;text-shadow:none;box-shadow:0 12px 30px rgba(8,12,28,.25);transition:transform .25s var(--ease),box-shadow .25s}
.btn:hover{transform:translateY(-2px);box-shadow:0 18px 40px rgba(8,12,28,.3)}
.btn svg{width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:2.2;stroke-linecap:round;stroke-linejoin:round}
.btn.sm{height:40px;padding:0 18px;font-size:14px;box-shadow:none}
.link{color:var(--tx2);text-underline-offset:4px}
.link:hover{color:#fff}

/* hero */
.hero{max-width:var(--w);margin:0 auto;padding:96px 16px 40px;text-align:center}
.eyebrow{display:inline-block;padding:5px 14px;border-radius:999px;background:var(--g2);border:1px solid var(--line2);font-size:13px;color:var(--tx2);margin-bottom:22px}
.hero h1{font-size:clamp(40px,6.4vw,76px);line-height:1.12;letter-spacing:.02em;text-shadow:0 2px 24px rgba(10,14,30,.25)}
.lead{max-width:640px;margin:24px auto 0;font-size:clamp(16px,1.6vw,19px);color:var(--tx2)}
.cta{display:flex;justify-content:center;align-items:center;gap:24px;margin-top:36px;flex-wrap:wrap}
.meta{margin-top:16px;font-size:13px;color:var(--tx3)}
.meta a{color:var(--tx2)}
.shot{margin:64px auto 0;padding:10px;border-radius:26px;background:var(--g1);border:1px solid var(--line);
  box-shadow:0 40px 90px rgba(8,12,28,.4);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px)}
.shot img{border-radius:18px}

/* sections */
.block{max-width:var(--w);margin:0 auto;padding:96px 16px 0}
.block>h2,.final h2{font-size:clamp(28px,3.6vw,42px);line-height:1.3;text-align:center}
.sub{max-width:620px;margin:16px auto 0;text-align:center;color:var(--tx2)}
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:48px}
.card,.steps li,.ai .row,.faq details{background:var(--g2);border:1px solid var(--line);border-radius:22px;
  backdrop-filter:blur(22px) saturate(1.3);-webkit-backdrop-filter:blur(22px) saturate(1.3);box-shadow:0 14px 34px rgba(8,12,28,.14)}
.card{padding:26px;transition:transform .3s var(--ease),background-color .3s}
.card:hover{transform:translateY(-4px);background:var(--g3)}
.card svg{width:40px;height:40px;padding:9px;border-radius:12px;background:rgba(255,255,255,.9);fill:none;stroke:var(--ink);stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
.card h3{margin-top:18px;font-size:18px}
.card p,.steps p,.ai p,.faq p{margin-top:8px;color:var(--tx2);font-size:15px}

.steps{list-style:none;padding:0;margin:48px 0 0;display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.steps li{padding:28px}
.steps span{display:grid;place-items:center;width:40px;height:40px;border-radius:50%;background:rgba(255,255,255,.92);color:var(--ink);font-weight:700;text-shadow:none}
.steps h3{margin-top:18px;font-size:18px}

.ai{display:grid;grid-template-columns:repeat(2,1fr);gap:18px;margin-top:48px}
.ai .row{display:flex;gap:16px;padding:24px;align-items:flex-start}
.dot{flex:none;display:grid;place-items:center;width:44px;height:44px;border-radius:50%;background:var(--c);font-size:14px;color:#fff;box-shadow:0 0 0 3px rgba(255,255,255,.25)}
.ai h3{font-size:18px}

.faq{max-width:780px;margin:48px auto 0;display:grid;gap:12px}
.faq details{padding:0 24px}
.faq summary{cursor:pointer;list-style:none;padding:20px 32px 20px 0;font-weight:700;position:relative}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"";position:absolute;right:4px;top:50%;width:10px;height:10px;margin-top:-7px;border-right:2px solid #fff;border-bottom:2px solid #fff;transform:rotate(45deg);transition:transform .25s var(--ease)}
.faq details[open] summary::after{transform:rotate(225deg);margin-top:-2px}
.faq details p{padding-bottom:20px;margin-top:0}

.final{max-width:var(--w);margin:120px auto 0;padding:72px 16px;text-align:center;border-radius:32px;background:var(--g1);border:1px solid var(--line);
  backdrop-filter:blur(22px);-webkit-backdrop-filter:blur(22px)}
.final .btn{margin-top:32px}
.hash{margin-top:10px;font-size:12px;color:var(--tx3);overflow-wrap:anywhere}
.hash code{font-family:'Cascadia Mono',Consolas,monospace}

.foot{max-width:var(--w);margin:0 auto;padding:56px 16px 48px;font-size:13px;color:var(--tx3)}
.foot div{display:flex;align-items:center;gap:24px;margin-bottom:14px}
.foot div a:not(.brand){color:var(--tx2)}
.foot .brand{font-size:16px;color:#fff}
.foot p+p{margin-top:4px}

/* terms page */
.doc{max-width:820px;margin:48px auto 0;padding:48px clamp(20px,5vw,56px);border-radius:28px;background:rgba(30,34,62,.42);border:1px solid var(--line);
  backdrop-filter:blur(22px);-webkit-backdrop-filter:blur(22px)}
.doc h1{font-size:clamp(28px,4vw,38px)}
.doc h2{font-size:19px;margin-top:36px}
.doc p,.doc li{margin-top:10px;color:var(--tx2)}
.doc ul,.doc ol{padding-left:1.4em;margin:8px 0 0}

@media (max-width:900px){
  .grid,.steps{grid-template-columns:1fr 1fr}
  .nav nav{display:none}
  .nav .btn{margin-left:auto}
}
@media (max-width:640px){
  .nav{margin:10px 12px 0}
  .grid,.steps,.ai{grid-template-columns:1fr}
  .hero{padding-top:64px}
  .shot{margin-top:44px;padding:6px;border-radius:18px}
  .shot img{border-radius:13px}
  .block{padding-top:72px}
  .final{margin:88px 16px 0;padding:56px 20px}
}
@media (prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}