:root{
  --navy:#12264F;
  --navy-deep:#0C1B3A;
  --yellow:#FFDE59;
  --yellow-dk:#EBCD2D;
  --red:#B51809;
  --cream:#F0EBD7;
  --ink:#1F2937;
  --line:#D9D2BC;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:'Noto Sans JP',"Hiragino Kaku Gothic ProN",Meiryo,sans-serif;color:var(--ink);background:#fff;line-height:1.9}
img{max-width:100%}
a{color:inherit}

header{background:#fff;border-bottom:1px solid #E5E7EB;position:sticky;top:0;z-index:50}
.h-inner{max-width:1080px;margin:0 auto;padding:12px 20px;display:flex;align-items:center;justify-content:space-between;gap:12px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none}
.brand-logo{height:46px;width:auto;display:block}
.brand-txt{line-height:1.3}
.brand-txt b{display:block;font-size:15px;color:var(--navy)}
.h-back{font-size:12px;color:var(--navy);text-decoration:none;border:1px solid var(--navy);border-radius:999px;padding:7px 14px;white-space:nowrap;font-weight:700;transition:background .2s,color .2s}
.h-back:hover{background:var(--navy);color:#fff}

/* KV */
.hero{background:linear-gradient(160deg,var(--navy) 0%,var(--navy-deep) 100%);color:#fff;padding:70px 20px 76px;position:relative;overflow:hidden}
.hero::before{content:"";position:absolute;right:-120px;top:-120px;width:420px;height:420px;border:1px solid rgba(255,222,89,.18);border-radius:50%}
.hero::after{content:"";position:absolute;right:-60px;top:-60px;width:420px;height:420px;border:1px solid rgba(255,222,89,.10);border-radius:50%}
.hero-inner{max-width:840px;margin:0 auto;position:relative;z-index:1;text-align:center}
.hero h1{font-size:clamp(28px,5.4vw,44px);font-weight:900;line-height:1.5;letter-spacing:.06em}
.hero .bar{width:72px;height:5px;background:var(--yellow);margin:22px auto}
.hero p.sub{font-size:clamp(15px,2.6vw,18px);color:var(--yellow);font-weight:700;letter-spacing:.12em}

section{padding:76px 20px}
.inner{max-width:1080px;margin:0 auto}
.sec-eyebrow{font-size:12px;letter-spacing:.22em;color:var(--navy);font-weight:700;text-align:center}
.sec-title{font-size:clamp(21px,3.4vw,29px);color:var(--navy);text-align:center;margin-top:8px;font-weight:900;letter-spacing:.04em}
.sec-bar{width:56px;height:4px;background:var(--yellow);margin:18px auto 0}
.sec-lead{max-width:720px;margin:30px auto 0;font-size:15px}

/* セクション1: とは */
.about-flex{max-width:860px;margin:36px auto 0;display:flex;gap:34px;align-items:center}
.about-flex .txt{flex:1;font-size:15px}
.about-flex .txt p+p{margin-top:1.2em}
.badge-box{flex:none;width:250px;background:var(--cream);border:1px solid var(--line);border-radius:12px;padding:22px 18px;text-align:center}
.badge-pair{display:flex;gap:14px;justify-content:center}
.badge-pair figure{margin:0}
.badge-pair img{width:92px;height:auto;display:block}
.badge-pair figcaption{font-size:11px;font-weight:700;color:var(--navy);margin-top:6px}
.badge-box p{font-size:11.5px;color:#6B7280;margin-top:12px;line-height:1.6}

/* セクション2: 背景 */
.bg-cream{background:var(--cream)}
.trouble-list{max-width:760px;margin:34px auto;display:grid;gap:13px}
.trouble{background:#fff;border:1px solid var(--line);border-left:4px solid var(--red);border-radius:8px;padding:15px 20px;display:flex;gap:14px;align-items:center;font-size:14.5px;font-weight:500;color:#374151}
.trouble .n{flex:none;font-weight:900;color:var(--red);font-size:15px}
.closing{max-width:720px;margin:0 auto;font-size:15px;text-align:center}
.closing b{color:var(--navy)}

/* セクション3: できること */
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:22px;margin:40px auto 0;max-width:1000px}
.card{background:#fff;border:1px solid #E5E7EB;border-radius:12px;padding:28px 24px;transition:transform .2s,box-shadow .2s}
.card:hover{transform:translateY(-4px);box-shadow:0 12px 28px rgba(12,27,58,.10)}
.card .num{display:flex;align-items:center;justify-content:center;width:44px;height:44px;border-radius:50%;background:var(--navy);color:var(--yellow);font-weight:900;font-size:18px;margin-bottom:16px}
.card h3{font-size:16.5px;color:var(--navy);margin-bottom:10px;line-height:1.5}
.card p{font-size:13.5px;color:#4B5563}
.cards-closing{max-width:720px;margin:36px auto 0;font-size:15px;text-align:center}

/* セクション4: 習得内容 */
.grade-cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:22px;margin:40px auto 0;max-width:820px}
.gcard{background:#fff;border:1px solid #E5E7EB;border-radius:12px;padding:30px 26px}
.gcard .g{display:inline-block;font-weight:900;font-size:13px;padding:4px 16px;border-radius:999px;margin-bottom:16px}
.g2{background:var(--yellow);color:var(--navy)}
.g1{background:var(--navy);color:var(--yellow)}
.gcard p{font-size:13.5px;color:#4B5563}

/* CTA */
.cta{background:var(--navy);color:#fff;text-align:center}
.cta h2{font-size:clamp(20px,3.4vw,28px);font-weight:900;letter-spacing:.04em}
.cta p{color:#C9D0DE;font-size:14px;margin-top:14px}
.cta a{display:inline-block;margin-top:26px;background:var(--yellow);color:var(--navy);font-weight:900;font-size:15px;text-decoration:none;padding:15px 42px;border-radius:999px;transition:background .2s}
.cta a:hover{background:var(--yellow-dk)}

footer{background:var(--navy-deep);color:#8A93A8;font-size:12px;padding:26px 20px;text-align:center}
footer a{color:#B9C1D2;text-decoration:none;margin:0 10px}
footer a:hover{text-decoration:underline}

@media (max-width:640px){
  .about-flex{flex-direction:column}
  .badge-box{width:100%;max-width:260px}
}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}