*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{--primary:#0078D4;--primary-dark:#002050;--primary-light:#50A0E0;--accent:#FFB900;--alert:#E74C3C;--bg-light:#F5F5F5;--text:#333;--text-sec:#666;--white:#fff;--radius:12px}
html{scroll-behavior:smooth}
body{font-family:'Noto Sans JP',sans-serif;font-size:16px;line-height:1.85;color:var(--text);background:var(--white);-webkit-font-smoothing:antialiased}
.container{max-width:1040px;margin:0 auto;padding:0 24px}
a{color:var(--primary);text-decoration:none}
/* nav */
.nav{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.95);backdrop-filter:blur(8px);border-bottom:1px solid #eee}
.nav-inner{max-width:1100px;margin:0 auto;padding:12px 24px;display:flex;align-items:center;justify-content:space-between;gap:16px}
.nav-logo img{display:block;height:32px;width:auto}
.back-link{font-size:.9rem;font-weight:700;color:var(--primary);white-space:nowrap}
.back-link:hover{color:var(--primary-dark)}
/* hero */
.hero{background:linear-gradient(135deg,var(--primary-dark),var(--primary));color:#fff;padding:64px 0 56px}
.hero .container{max-width:1040px}
.hero-eyebrow{display:inline-block;background:var(--accent);color:#3a2a00;font-size:.8rem;font-weight:700;letter-spacing:.04em;padding:5px 14px;border-radius:999px;margin-bottom:18px}
.hero h1{font-size:clamp(1.6rem,3.4vw,2.3rem);font-weight:900;line-height:1.4;margin-bottom:16px}
.hero-lead{font-size:1.02rem;line-height:1.9;color:#dce8f7;max-width:760px}
/* section */
.section{padding:56px 0}
.section.alt{background:var(--bg-light)}
.section-head{margin-bottom:28px}
.section-head h2{font-size:clamp(1.3rem,2.6vw,1.7rem);font-weight:800;color:var(--primary-dark);position:relative;padding-bottom:12px}
.section-head h2::after{content:'';position:absolute;left:0;bottom:0;width:54px;height:3px;background:linear-gradient(90deg,var(--primary),var(--accent));border-radius:2px}
.section-head p{margin-top:10px;color:var(--text-sec)}
.lead-block p{margin-bottom:14px}
ul.checks{list-style:none;display:flex;flex-direction:column;gap:10px}
ul.checks li{position:relative;padding-left:30px;line-height:1.8}
ul.checks li::before{content:'✓';position:absolute;left:0;top:0;color:var(--primary);font-weight:900}
/* cards */
.card-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:18px}
.card{background:#fff;border:1px solid #e6e9ee;border-top:3px solid var(--primary);border-radius:var(--radius);padding:22px 22px;box-shadow:0 2px 14px rgba(0,0,0,.04)}
.card.warn{border-top-color:var(--alert)}
.card h3{font-size:1.02rem;color:var(--primary-dark);margin-bottom:8px}
.card p{font-size:.9rem;color:var(--text-sec);line-height:1.8}
.card .tag{display:inline-block;font-size:.72rem;font-weight:700;color:var(--primary);background:#eaf3fc;border-radius:6px;padding:3px 9px;margin-bottom:10px}
/* table */
.tbl-wrap{overflow-x:auto;border-radius:var(--radius);box-shadow:0 2px 14px rgba(0,0,0,.05)}
table.info{width:100%;border-collapse:collapse;background:#fff;min-width:520px}
table.info th,table.info td{padding:13px 16px;text-align:left;border-bottom:1px solid #eef1f5;font-size:.9rem;vertical-align:top}
table.info thead th{background:var(--primary-dark);color:#fff;font-weight:700;border-bottom:none}
table.info tbody tr:nth-child(even){background:#f7fafd}
table.info td:first-child{font-weight:700;color:var(--primary-dark);white-space:nowrap}
/* steps */
.steps{display:flex;flex-direction:column;gap:14px;counter-reset:st}
.step{display:flex;gap:16px;background:#fff;border:1px solid #e6e9ee;border-radius:var(--radius);padding:18px 20px}
.step__no{flex:0 0 36px;width:36px;height:36px;border-radius:50%;background:var(--primary);color:#fff;font-weight:800;display:flex;align-items:center;justify-content:center}
.step__b h3{font-size:1rem;color:var(--primary-dark);margin-bottom:4px}
.step__b p{font-size:.9rem;color:var(--text-sec);line-height:1.8}
/* callout */
.callout{background:#fff8e6;border:1px solid #f3dea0;border-left:4px solid var(--accent);border-radius:0 var(--radius) var(--radius) 0;padding:18px 22px;margin-top:8px}
.callout strong{color:#7a5c00}
/* related + cta */
.related-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:14px}
.rel{display:block;background:#fff;border:1px solid #e6e9ee;border-radius:var(--radius);padding:16px 18px;transition:.2s}
.rel:hover{border-color:var(--primary-light);transform:translateY(-2px);box-shadow:0 8px 22px rgba(0,0,0,.08)}
.rel span{font-size:.74rem;font-weight:700;color:var(--primary)}
.rel h3{font-size:.98rem;color:var(--primary-dark);margin:4px 0 2px}
.rel em{font-style:normal;font-size:.84rem;color:var(--text-sec)}
.cta{background:linear-gradient(135deg,var(--primary-dark),#003a7a);color:#fff;text-align:center;padding:56px 0}
.cta h2{font-size:clamp(1.3rem,2.6vw,1.7rem);font-weight:800;margin-bottom:12px}
.cta p{color:#cfe0f5;margin-bottom:24px}
.btn{display:inline-flex;align-items:center;gap:8px;font-weight:700;border-radius:10px;padding:14px 30px;font-size:1rem}
.btn-accent{background:var(--accent);color:#3a2a00}
.btn-accent:hover{filter:brightness(1.05)}
/* footer */
.footer{background:#0a0a1a;color:#9aa3b2;text-align:center;padding:40px 0;font-size:.82rem;line-height:1.9}
.footer-logo{color:#fff;font-weight:800;font-size:1.1rem;margin-bottom:8px}
.footer-legal{margin-top:14px;font-size:.72rem;color:#6b7280}
@media(max-width:640px){.hero{padding:48px 0 40px}.section{padding:40px 0}}