:root{
    --bg:#0b1220;
    --card:#0f172a;
    --ink:#e5e7eb;
    --muted:#9ca3af;
    --accent:#22d3ee;
    --brand:#38bdf8;
    --focus:#f59e0b;
    --container:min(1080px,92vw);
}
*{
    box-sizing:border-box;
}
html:focus-within{
    scroll-behavior:smooth;
}
html,body{
    margin:0;
    padding:0;
}
body{
    font-family:"Noto Sans JP",system-ui,-apple-system,Sego UI,Roboto,"Hiragino Kaku Gothic ProN","Noto Sans JP","Yu Gothic UI",Meiryo,sans-serif;
    line-height:1.7;
    color:var(--ink);
    background:radial-gradient(1200px 600px at 10% -10%, rgba(56,189,248,.15), transparent 60%),#0b1220;
}
a{
    color:var(--brand);
    text-decoration:none;
}
a:hover{
    text-decoration:underline;
}
.skip-link{
    position:absolute;
    left:-999px;
    top:auto;
    width:1px;
    height:1px;
    overflow:hidden;
}
.skip-link:focus{
    left:8px;
    top:8px;
    width:auto;
    height:auto;
    background:#111827;
    color:#fff;
    padding:8px 12px;
    border-radius:8px;
    outline:3px solid var(--focus)
}
.container{
    width:var(--container);
    margin-inline:auto;
}
.site-header{
    border-bottom:1px solid rgba(255,255,255,.08);
    position:sticky;
    top:0;
    background:rgba(11,18,32,.7);
    backdrop-filter:blur(8px);
    -webkit-backdrop-filter:blur(8px);
    z-index:10;
}
.header-inner{
    display:flex;
    align-items:center;
    justify-content:space-between;
    padding:12px 0;
}
.brand{
    display:flex;
    gap:10px;
    align-items:center;
    font-weight:700;
    color:var(--ink);
}
.brand span{
    letter-spacing:.2px;
}
.menu-button{
    display:none;
    background:transparent;
    border:1px solid rgba(255,255,255,.12);
    color:var(--ink);
    padding:6px 10px;
    border-radius:8px;
}
.site-nav{
    display:flex;
    gap:20px
}
.site-nav a{
    color:var(--ink);
    opacity:.9;
}
.site-nav.small a{
    font-size:.9rem;
    color:var(--muted);
}
@media (max-width:760px){
    .menu-button{
        display:inline-block;
    }
    .site-nav{
        display:none;
        position:absolute;
        right:4vw;
        top:58px;
        background:#0f172a;
        border:1px solid rgba(255,255,255,.08);
        padding:10px 14px;
        border-radius:12px;
        flex-direction:column;
    }
    .site-nav.open{
        display:flex;
    }
}
.section{
    padding:56px 0
}
.section.alt{
    background:linear-gradient(180deg, rgba(255,255,255,.03), transparent 60%)
}
.grid-2{
    display:grid;
    grid-template-columns:1.2fr 1fr;
    gap:24px
}
@media (max-width:860px){
    .grid-2{
        grid-template-columns:1fr
    }
}
.card{
    background:var(--card);
    border:1px solid rgba(255,255,255,.08);
    border-radius:16px;
    padding:20px;
    box-shadow:0 10px 24px rgba(0,0,0,.2)
}
.cards3{
    display:grid;
    grid-template-columns:repeat(3,1fr);
    gap:20px
}
@media (max-width:980px){
    .cards3{
        grid-template-columns:1fr 1fr
    }
}
@media (max-width:640px){
    .cards3{
        grid-template-columns:1fr
    }
}
.tags span{
    display:inline-block;
    border:1px solid rgba(255,255,255,.14);
    padding:2px 8px;
    border-radius:999px;
    margin-right:6px;
    font-size:.85rem;color:var(--muted)
}
.check{
    padding-left:1.2em
}
.check li{
    margin:6px 0
}
.steps{
    padding-left:1.2em
}
.cta{
    display:flex;
    gap:12px;
    margin-top:16px;
    flex-wrap:wrap
}
.btn{
    display:inline-block;
    padding:10px 16px;
    border-radius:12px;
    border:1px solid rgba(255,255,255,.16)
}
.btn.primary{
    background:linear-gradient(90deg,var(--brand),var(--accent));
    color:#001b2a;font-weight:700
}
.btn.ghost{
    border-color:rgba(255,255,255,.2);
    color:var(--ink)
}
.muted{
    color:var(--muted)
}
.site-footer{
    border-top:1px solid rgba(255,255,255,.08);
    padding:22px 0;margin-top:20px
}
.prose p{
    margin:0 0 10px
}
.breadcrumbs{
    font-size:.9rem;
    color:var(--muted);
    margin-bottom:12px
}
.breadcrumbs a{
    color:var(--muted)
}
table{
    border-collapse:collapse;
    width:100%
}
th,td{
    border:1px solid rgba(255,255,255,.12);
    padding:8px;
    text-align:left
}
/* Hero image stack */
.hero-img{
    position:relative;
    padding:0
}
.hero-img picture, .hero-img img{
    display:block;
    width:100%;
    height:auto
}
.hero-overlay{
    position:absolute;
    inset:0;
    display:flex;
    align-items:center;
    justify-content:center;
    text-align:center;
    padding:clamp(16px,4vw,48px)
}
.hero-overlay h1{
    font-size:clamp(28px,5vw,56px);
    line-height:1.2;
    margin:0 0 12px;
    text-shadow:0 2px 12px rgba(0,0,0,.6)
}
.hero-overlay .lede{
    font-size:clamp(16px,2.2vw,18px);
    color:#e5e7eb;
    text-shadow:0 2px 10px rgba(0,0,0,.5)
}
.hero-overlay .cta{
    justify-content:center
}

/* 1110-2025.1243追記 */
/* ヒーロー内CTAを流体タイポに */
.hero-overlay .btn.primary{
  font-size: clamp(12px, 3.6vw, 18px);
  padding: clamp(8px, 1.8vw, 12px) clamp(12px, 3.2vw, 20px);
  border-radius: clamp(6px, 1.6vw, 10px);
  line-height: 1.2;
  min-height: 30px; /* タップ領域の確保（WCAG配慮） */
}

/* ごく小さい端末ではさらに少しだけ締める */
@media (max-width: 390px) {
  .hero-overlay .btn.primary {
    font-size: 13px;
    padding: 8px 12px;
  }
}