:root{
  --navy:#103A71;--blue:#1E88E5;--gold:#C99A1A;--gold-light:#E7D3A0;--warm-white:#F8F5EF;--charcoal:#333333;
  --gold-deep:#8f7015;--blue-tint:#eaf2fc;--gold-tint:#faf3e2;
  --ink:var(--charcoal);--gray:#5b6470;--line:#e8e2d3;--bg:#fff;--white:#fff;--radius:20px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:"Noto Sans JP","Hiragino Kaku Gothic ProN","Hiragino Sans","Yu Gothic",-apple-system,BlinkMacSystemFont,sans-serif;font-size:16px;line-height:1.9;color:var(--ink);background:var(--bg);-webkit-font-smoothing:antialiased}
h1,h2,h3{font-family:"Noto Serif JP","Hiragino Mincho ProN",serif;color:var(--navy);line-height:1.5}
a{color:inherit;text-decoration:none}
.font-en{font-family:"Cinzel",serif;letter-spacing:.08em}
.wrap{max-width:1080px;margin:0 auto;padding:0 24px}
section{padding:88px 0}
.alt{background:var(--warm-white)}
p{color:var(--gray)}
strong{color:var(--navy)}
.hl{background:linear-gradient(transparent 62%,var(--gold-light) 62%);padding:0 2px}

/* header */
header.top{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.94);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
header.top .wrap{display:flex;align-items:center;justify-content:space-between;height:64px}
.logo{font-family:"Cinzel",serif;font-weight:700;font-size:20px;color:var(--navy);letter-spacing:.08em}
.logo span{color:var(--gold)}
header.top nav{display:flex;gap:24px;align-items:center;font-size:14px;font-weight:500}
header.top nav a:hover{color:var(--blue)}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;padding:14px 28px;border-radius:999px;font-weight:700;font-size:15px;transition:transform .15s ease,box-shadow .15s ease}
.btn-primary{background:linear-gradient(135deg,var(--navy),var(--blue));color:#fff;box-shadow:0 10px 24px rgba(16,58,113,.32)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 14px 28px rgba(16,58,113,.4)}
.btn-ghost{background:#fff;color:var(--gold-deep);border:1px solid var(--gold-light);box-shadow:0 4px 14px rgba(51,51,51,.06)}
.btn-ghost:hover{transform:translateY(-2px);box-shadow:0 8px 18px rgba(16,58,113,.1)}
.btn-row{display:flex;gap:14px;flex-wrap:wrap;margin-top:28px}

/* hero */
.hero{position:relative;overflow:hidden;padding:84px 0 72px;background:linear-gradient(180deg,#fff,var(--warm-white))}
.blob{position:absolute;border-radius:50%;filter:blur(60px);pointer-events:none}
.blob.a{width:420px;height:420px;background:rgba(30,136,229,.16);top:-120px;right:-80px}
.blob.b{width:320px;height:320px;background:rgba(201,154,26,.16);bottom:-120px;left:-60px}
.hero .wrap{position:relative;display:grid;grid-template-columns:1.1fr .9fr;gap:48px;align-items:center}
.badge{display:inline-block;font-size:13px;font-weight:700;color:var(--gold-deep);background:var(--gold-tint);border:1px solid var(--gold-light);padding:4px 14px;border-radius:999px;margin-bottom:18px}
.hero h1{font-size:clamp(26px,4vw,42px);font-weight:700}
.hero .lead{margin-top:20px;font-size:17px}
.hero-note{margin-top:14px;font-size:13px}

/* chat mock */
.chat{background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:0 18px 40px rgba(16,58,113,.12);padding:22px;font-size:14px;line-height:1.7}
.chat .bar{display:flex;gap:6px;margin-bottom:14px}
.chat .bar i{width:10px;height:10px;border-radius:50%;background:var(--line)}
.bub{padding:10px 14px;border-radius:14px;margin-bottom:10px;max-width:92%}
.bub.me{background:var(--blue-tint);color:var(--navy);margin-left:auto;border-bottom-right-radius:4px}
.bub.ai{background:var(--warm-white);color:var(--ink);border-bottom-left-radius:4px}
.bub.ai b{color:var(--navy)}
.tag{display:inline-block;font-size:11px;font-weight:700;color:#fff;background:var(--navy);border-radius:6px;padding:0 6px;margin-right:4px}
.okbtn{display:inline-block;margin-top:6px;font-size:12px;font-weight:700;color:#fff;background:linear-gradient(135deg,var(--navy),var(--blue));padding:3px 14px;border-radius:999px}

/* section head */
.section-head{text-align:center;margin-bottom:48px}
.section-head .en{font-family:"Cinzel",serif;color:var(--gold);letter-spacing:.2em;font-size:13px;font-weight:600}
.section-head h2{font-size:clamp(22px,3vw,32px);margin-top:6px}
.section-head p{margin-top:12px}

/* cards */
.grid{display:grid;gap:20px}
.g2{grid-template-columns:repeat(2,1fr)}
.g3{grid-template-columns:repeat(3,1fr)}
.g4{grid-template-columns:repeat(4,1fr)}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:28px 24px;box-shadow:0 6px 18px rgba(51,51,51,.05)}
.card h3{font-size:18px;margin-bottom:8px}
.card .ico{width:48px;height:48px;border-radius:14px;background:var(--blue-tint);display:flex;align-items:center;justify-content:center;font-size:24px;margin-bottom:14px}
.card .ico.gold{background:var(--gold-tint)}
.card .num{font-family:"Cinzel",serif;color:var(--gold);font-size:28px;font-weight:700;line-height:1}
.card ul{margin:10px 0 0 1.2em;color:var(--gray);font-size:15px}
.rw{display:flex;gap:8px;flex-wrap:wrap;margin-top:12px}
.rw span{font-size:12px;font-weight:700;border-radius:999px;padding:2px 12px}
.rw .r{background:var(--blue-tint);color:var(--navy)}
.rw .w{background:var(--gold-tint);color:var(--gold-deep)}

/* pain */
.pain li{list-style:none;background:#fff;border:1px solid var(--line);border-left:4px solid var(--gold);border-radius:12px;padding:14px 18px;margin-bottom:12px;color:var(--ink)}

/* steps */
.steps{counter-reset:s}
.step{position:relative;padding-left:72px;margin-bottom:28px}
.step::before{counter-increment:s;content:counter(s);position:absolute;left:0;top:0;width:52px;height:52px;border-radius:50%;background:linear-gradient(135deg,var(--navy),var(--blue));color:#fff;font-family:"Cinzel",serif;font-size:22px;font-weight:700;display:flex;align-items:center;justify-content:center}
.step::after{content:"";position:absolute;left:25px;top:56px;bottom:-24px;width:2px;background:var(--line)}
.step:last-child::after{display:none}
.step h3{font-size:18px}
.step .t{font-size:13px;color:var(--gold-deep);font-weight:700}

/* safety */
.safe{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.safe .card{border-top:4px solid var(--navy)}

/* prompt */
.prompt{background:#fff;border:1px solid var(--line);border-radius:14px;padding:16px 18px;margin-top:10px;font-size:14px;color:var(--ink);position:relative}
.prompt::before{content:"プロンプト例";display:block;font-size:11px;font-weight:700;color:var(--gold-deep);margin-bottom:2px}
.cat{font-size:13px;font-weight:700;color:var(--blue)}

/* price */
.price{max-width:560px;margin:0 auto;text-align:center;border:2px solid var(--gold-light);border-radius:28px;background:#fff;padding:40px 28px;box-shadow:0 18px 40px rgba(201,154,26,.14)}
.price .amount{font-family:"Noto Serif JP",serif;color:var(--gold-deep);font-size:56px;font-weight:700;line-height:1.2}
.price .amount small{font-size:18px;color:var(--gray);font-weight:500}
.price ul{list-style:none;text-align:left;display:inline-block;margin-top:18px;color:var(--ink)}
.price li::before{content:"✓";color:var(--gold);font-weight:700;margin-right:8px}
.price .note{font-size:13px;margin-top:16px}

/* faq */
details{background:#fff;border:1px solid var(--line);border-radius:14px;padding:16px 20px;margin-bottom:12px}
summary{cursor:pointer;font-weight:700;color:var(--navy)}
details p{margin-top:10px;font-size:15px}

/* cta */
.cta{background:linear-gradient(135deg,var(--navy),#1b5ca8 60%,var(--blue));color:#fff;text-align:center}
.cta h2{color:#fff}
.cta p{color:rgba(255,255,255,.88)}
.cta .btn-primary{background:#fff;color:var(--navy);box-shadow:0 10px 24px rgba(0,0,0,.2)}
.cta .btn-ghost{background:transparent;color:#fff;border-color:rgba(255,255,255,.5)}

footer{padding:36px 0;background:#0c2c56;color:rgba(255,255,255,.75);font-size:12.5px;line-height:1.8}
footer p{color:inherit}
footer .logo{color:#fff;margin-bottom:8px;display:block}

@media(max-width:900px){.g4{grid-template-columns:repeat(2,1fr)}}
@media(max-width:860px){.hero .wrap{grid-template-columns:1fr}.g3,.safe{grid-template-columns:1fr}}
@media(max-width:760px){header.top nav .hide-sm{display:none}section{padding:64px 0}}
@media(max-width:560px){.g2,.g4{grid-template-columns:1fr}.price .amount{font-size:46px}.btn{width:100%}}