:root{
  --brand:#1d4ed8;
  --brand-dark:#1e40af;
  --brand-600:#2563eb;
  --brand-500:#3b82f6;
  --blue-50:#eff6ff;
  --blue-100:#dbeafe;
  --blue-200:#bfdbfe;
  --ink:#16223a;
  --muted:#475569;
  --bg:#ffffff;
  --surface:#f6f9fe;
  --surface-2:#eef4fd;
  --border:#e2e8f0;
  --border-strong:#cbd5e1;
  --radius:14px;
  --radius-sm:10px;
  --shadow:0 1px 2px rgba(16,34,58,.06),0 8px 24px rgba(16,34,58,.06);
  --shadow-hover:0 2px 6px rgba(16,34,58,.08),0 18px 40px rgba(16,34,58,.12);
  --maxw:1120px;
}

*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Hiragino Kaku Gothic ProN","Hiragino Sans","Yu Gothic","Yu Gothic UI",Meiryo,"Noto Sans JP",sans-serif;
  color:var(--ink);
  background:var(--bg);
  line-height:1.85;
  font-size:16px;
  text-rendering:optimizeLegibility;
}
img,svg{max-width:100%;height:auto}
a{color:var(--brand);text-decoration:underline;text-underline-offset:2px}
a:hover{color:var(--brand-dark)}
:focus-visible{outline:3px solid var(--brand);outline-offset:2px;border-radius:4px}
h1,h2,h3,h4{line-height:1.4;color:var(--ink);font-weight:800;margin:0 0 .6em}
h1{font-size:clamp(1.7rem,4.4vw,2.5rem);letter-spacing:.2px}
h2{font-size:clamp(1.35rem,3vw,1.8rem);margin-top:1.6em}
h3{font-size:clamp(1.12rem,2.2vw,1.32rem);margin-top:1.4em}
p{margin:0 0 1.1em}
ul,ol{margin:0 0 1.1em;padding-left:1.4em}
li{margin:.35em 0}
hr{border:0;border-top:1px solid var(--border);margin:2.4em 0}

.container{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 20px}
.section{padding:clamp(40px,7vw,76px) 0}
.section--tint{background:var(--surface)}
.center{text-align:center}
.lead{font-size:1.12rem;color:var(--muted);max-width:62ch}
.eyebrow{display:inline-block;font-size:.82rem;font-weight:800;letter-spacing:.14em;text-transform:uppercase;color:var(--brand);background:var(--blue-50);border:1px solid var(--blue-100);padding:6px 12px;border-radius:999px;margin-bottom:14px}

.skip-link{position:absolute;left:-9999px;top:auto}
.skip-link:focus{left:16px;top:12px;z-index:200;background:#fff;color:var(--brand);padding:10px 16px;border-radius:8px;box-shadow:var(--shadow);text-decoration:none}

.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.92);backdrop-filter:saturate(160%) blur(8px);-webkit-backdrop-filter:saturate(160%) blur(8px);border-bottom:1px solid var(--border)}
.header-inner{display:flex;align-items:center;justify-content:space-between;min-height:66px;gap:16px}
.brand{display:inline-flex;align-items:center;gap:11px;text-decoration:none;color:var(--brand);font-weight:800;font-size:1.28rem;letter-spacing:.4px}
.brand:hover{color:var(--brand)}
.brand img{display:block;width:40px;height:40px}
.brand span{white-space:nowrap}

.nav-toggle-cb{position:absolute;width:1px;height:1px;opacity:0;overflow:hidden;clip:rect(0 0 0 0)}
.nav-toggle-btn{display:none;align-items:center;justify-content:center;width:48px;height:48px;border:1px solid var(--border-strong);border-radius:10px;background:#fff;cursor:pointer;color:var(--ink)}
.nav-toggle-btn .bars,.nav-toggle-btn .bars::before,.nav-toggle-btn .bars::after{display:block;width:22px;height:2px;background:currentColor;border-radius:2px;position:relative;transition:transform .2s ease}
.nav-toggle-btn .bars::before,.nav-toggle-btn .bars::after{content:"";position:absolute;left:0}
.nav-toggle-btn .bars::before{top:-7px}
.nav-toggle-btn .bars::after{top:7px}
.nav-toggle-cb:focus-visible+.nav-toggle-btn{outline:3px solid var(--brand);outline-offset:2px}

.site-nav ul{display:flex;align-items:center;gap:6px;list-style:none;margin:0;padding:0}
.site-nav a{display:inline-flex;align-items:center;min-height:44px;padding:8px 14px;border-radius:10px;text-decoration:none;color:var(--ink);font-weight:600}
.site-nav a:hover{background:var(--surface-2);color:var(--brand-dark)}
.site-nav a[aria-current="page"]{color:var(--brand-dark);background:var(--blue-50)}
.nav-cta{background:var(--brand)!important;color:#fff!important}
.nav-cta:hover{background:var(--brand-dark)!important;color:#fff!important}

.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:50px;padding:13px 26px;border-radius:12px;font-weight:700;text-decoration:none;cursor:pointer;border:1px solid transparent;transition:transform .12s ease,box-shadow .2s ease,background .2s ease}
.btn:hover{transform:translateY(-1px)}
.btn-primary{background:var(--brand);color:#fff;box-shadow:0 8px 20px rgba(29,78,216,.25)}
.btn-primary:hover{background:var(--brand-dark);color:#fff}
.btn-ghost{background:#fff;color:var(--brand-dark);border-color:var(--border-strong)}
.btn-ghost:hover{border-color:var(--brand);background:var(--surface)}

.hero{background:linear-gradient(165deg,#e9f1ff 0%,#f4f8ff 55%,#ffffff 100%);border-bottom:1px solid var(--border)}
.hero-inner{display:grid;grid-template-columns:1.15fr .85fr;gap:40px;align-items:center;padding:clamp(44px,8vw,84px) 0}
.hero h1{margin-bottom:.4em}
.hero .lead{margin-bottom:1.6em}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px}
.hero-art{display:flex;justify-content:center}
.hero-art .badge{background:#fff;border:1px solid var(--border);border-radius:28px;box-shadow:var(--shadow);padding:26px;display:grid;place-items:center}
.hero-art img{width:min(300px,72vw);height:auto}

.grid{display:grid;gap:22px}
.grid-2{grid-template-columns:repeat(2,1fr)}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}

.card{background:#fff;border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:26px;height:100%}
.feature{display:flex;flex-direction:column;gap:8px}
.feature .ic{display:inline-grid;place-items:center;width:50px;height:50px;border-radius:14px;background:var(--blue-50);border:1px solid var(--blue-100);margin-bottom:6px}
.feature .ic svg{width:26px;height:26px}
.feature h3{margin:0;font-size:1.12rem}
.feature p{margin:0;color:var(--muted);font-size:.97rem}

.article-card{display:flex;flex-direction:column;background:#fff;border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden;transition:box-shadow .2s ease,transform .12s ease;height:100%}
.article-card:hover{box-shadow:var(--shadow-hover);transform:translateY(-2px)}
.article-card .thumb{aspect-ratio:16/9;background:linear-gradient(150deg,var(--brand-500),var(--brand-dark));display:grid;place-items:center}
.article-card .thumb img{width:96px;height:96px}
.article-card .body{padding:22px;display:flex;flex-direction:column;gap:10px;flex:1}
.tag{align-self:flex-start;font-size:.76rem;font-weight:800;letter-spacing:.06em;color:var(--brand-dark);background:var(--blue-50);border:1px solid var(--blue-100);padding:4px 10px;border-radius:999px}
.article-card h3{margin:0;font-size:1.16rem;line-height:1.45}
.article-card h3 a{text-decoration:none;color:var(--ink)}
.article-card h3 a:hover{color:var(--brand-dark);text-decoration:underline}
.article-card p{margin:0;color:var(--muted);font-size:.96rem}
.article-card .meta{margin-top:auto;font-size:.84rem;color:var(--muted);display:flex;gap:10px;align-items:center}

.trust-banner{display:flex;gap:18px;align-items:center;flex-wrap:wrap;justify-content:center;background:var(--surface-2);border:1px solid var(--blue-100);border-radius:var(--radius);padding:22px 26px}
.trust-banner .t-ic{width:46px;height:46px;display:grid;place-items:center;background:#fff;border-radius:12px;border:1px solid var(--blue-100)}
.trust-banner p{margin:0;color:var(--ink);font-weight:600}
.trust-banner small{display:block;color:var(--muted);font-weight:400}

.breadcrumb{padding:18px 0 0}
.breadcrumb ol{display:flex;flex-wrap:wrap;gap:8px;list-style:none;margin:0;padding:0;font-size:.88rem;color:var(--muted)}
.breadcrumb li{display:flex;gap:8px;align-items:center}
.breadcrumb li+li::before{content:"›";color:var(--border-strong)}
.breadcrumb a{color:var(--brand-dark);text-decoration:underline;text-underline-offset:2px}
.breadcrumb a:hover{color:var(--brand-dark);text-decoration:underline}

.article-wrap{display:grid;grid-template-columns:minmax(0,1fr);gap:0;max-width:760px;margin:0 auto}
.article-header{padding:8px 0 6px}
.article-header h1{margin-bottom:.3em}
.article-meta{display:flex;flex-wrap:wrap;gap:14px;align-items:center;color:var(--muted);font-size:.9rem;margin-bottom:8px}
.article-meta .by{font-weight:700;color:var(--ink)}
.prose{font-size:1.04rem}
.prose h2{padding-top:.2em}
.prose h2::after{content:"";display:block;width:54px;height:3px;background:var(--brand);border-radius:3px;margin-top:.4em}
.prose img{border-radius:12px;border:1px solid var(--border)}
.prose code{background:var(--surface-2);border:1px solid var(--border);border-radius:6px;padding:.1em .4em;font-size:.92em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;overflow-wrap:anywhere;word-break:break-word}

.summary-card{background:linear-gradient(160deg,var(--blue-50),#fff);border:1px solid var(--blue-100);border-left:5px solid var(--brand);border-radius:var(--radius);padding:22px 24px;margin:0 0 28px}
.summary-card h2{margin:0 0 .5em;font-size:1.18rem;display:flex;align-items:center;gap:10px}
.summary-card h2::after{display:none}
.summary-card .badge-q{font-size:.72rem;font-weight:800;letter-spacing:.1em;color:#fff;background:var(--brand);padding:4px 9px;border-radius:6px}
.summary-card ul{margin:0;padding-left:1.2em}
.summary-card li{margin:.4em 0}

.steps{counter-reset:step;list-style:none;padding:0;margin:0 0 1.4em}
.steps>li{position:relative;padding:18px 18px 18px 64px;border:1px solid var(--border);border-radius:12px;margin:0 0 14px;background:#fff}
.steps>li::before{counter-increment:step;content:counter(step);position:absolute;left:16px;top:16px;width:34px;height:34px;display:grid;place-items:center;background:var(--brand);color:#fff;font-weight:800;border-radius:50%}
.steps>li h3{margin:.1em 0 .3em;font-size:1.06rem}
.steps>li p{margin:0;color:var(--muted)}

.table-wrap{overflow-x:auto;margin:0 0 1.4em;border:1px solid var(--border);border-radius:12px}
table{width:100%;border-collapse:collapse;min-width:420px;font-size:.97rem}
caption{text-align:left;color:var(--muted);font-size:.86rem;padding:10px 14px}
th,td{padding:12px 14px;text-align:left;border-bottom:1px solid var(--border);vertical-align:top}
thead th{background:var(--surface-2);color:var(--ink);font-weight:700}
tbody tr:last-child td{border-bottom:0}

.note{background:var(--surface);border:1px solid var(--border);border-left:5px solid var(--brand-500);border-radius:12px;padding:16px 18px;margin:0 0 1.4em}
.note strong{color:var(--ink)}
.note--guard{border-left-color:var(--brand-dark);background:var(--blue-50)}

.faq dt{font-weight:700;margin-top:1.1em}
.faq dd{margin:.3em 0 0;color:var(--muted)}

.author-box{display:flex;gap:16px;align-items:flex-start;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:20px 22px;margin:30px 0 0}
.author-box .av{flex:0 0 auto;width:56px;height:56px;border-radius:14px;background:var(--blue-50);border:1px solid var(--blue-100);display:grid;place-items:center}
.author-box .av img{width:38px;height:38px}
.author-box h3{margin:0 0 .2em;font-size:1.04rem}
.author-box p{margin:0;color:var(--muted);font-size:.93rem}

.page-head{background:linear-gradient(165deg,#e9f1ff,#f6f9fe 70%);border-bottom:1px solid var(--border)}
.page-head .inner{padding:clamp(34px,6vw,60px) 0}
.legal{max-width:800px;margin:0 auto}
.legal h2{font-size:1.24rem}
.legal h3{font-size:1.08rem}
.legal .updated{color:var(--muted);font-size:.9rem;margin-bottom:1.6em}

.contact-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.contact-card{text-align:center}
.contact-card .ic{width:54px;height:54px;margin:0 auto 12px;display:grid;place-items:center;border-radius:14px;background:var(--blue-50);border:1px solid var(--blue-100)}
.contact-card a{font-weight:700;word-break:break-word}

.cta-band{background:linear-gradient(160deg,var(--brand),var(--brand-dark));color:#fff;border-radius:20px;padding:clamp(30px,5vw,52px);text-align:center}
.cta-band h2{color:#fff}
.cta-band h2::after{display:none}
.cta-band p{color:#dbe7ff;max-width:60ch;margin-inline:auto}
.cta-band .btn-ghost{background:#fff;color:var(--brand-dark);border-color:#fff}

.site-footer{background:#0f1f3d;color:#c7d4e8;margin-top:0;padding:54px 0 28px}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1.2fr;gap:34px}
.site-footer .f-brand{display:inline-flex;align-items:center;gap:10px;color:#fff;font-weight:800;font-size:1.2rem;text-decoration:none;margin-bottom:12px}
.site-footer .f-brand img{width:38px;height:38px}
.site-footer p{color:#9fb2cf;font-size:.93rem;margin:0 0 14px}
.site-footer h4{color:#fff;font-size:.95rem;letter-spacing:.04em;margin:0 0 14px;text-transform:uppercase}
.site-footer ul{list-style:none;margin:0;padding:0}
.site-footer li{margin:.5em 0}
.site-footer a{color:#c7d4e8;text-decoration:none}
.site-footer a:hover{color:#fff;text-decoration:underline}
.site-footer li a{text-decoration:underline;text-underline-offset:2px}
.social{display:flex;gap:10px;margin-top:6px}
.social a{display:grid;place-items:center;width:44px;height:44px;border-radius:11px;background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.14);color:#fff}
.social a:hover{background:rgba(255,255,255,.18)}
.social svg{width:20px;height:20px}
.footer-bottom{border-top:1px solid rgba(255,255,255,.12);margin-top:36px;padding-top:22px;display:flex;flex-wrap:wrap;gap:10px 20px;justify-content:space-between;align-items:center;color:#8ea3c4;font-size:.86rem}
.footer-bottom a{color:#8ea3c4}

.mb-0{margin-bottom:0}
.mt-2{margin-top:28px}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);border:0}

@media (max-width:980px){
  .hero-inner{grid-template-columns:1fr;text-align:center}
  .hero-actions{justify-content:center}
  .hero-art{order:-1}
  .grid-4{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1fr 1fr;gap:28px}
}
@media (max-width:860px){
  .nav-toggle-btn{display:inline-flex}
  .site-nav{position:absolute;left:0;right:0;top:100%;background:#fff;border-bottom:1px solid var(--border);box-shadow:var(--shadow);max-height:0;overflow:hidden;transition:max-height .25s ease;visibility:hidden}
  .nav-toggle-cb:checked~.site-nav{max-height:430px;visibility:visible}
  .site-nav ul{flex-direction:column;align-items:stretch;gap:2px;padding:10px 16px 16px}
  .site-nav a{min-height:50px}
  .header-inner{position:relative}
}
@media (max-width:760px){
  .grid-3{grid-template-columns:1fr}
  .grid-2{grid-template-columns:1fr}
  .contact-grid{grid-template-columns:1fr}
}
@media (max-width:560px){
  .grid-4{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .brand span{font-size:1.12rem}
}
@media (prefers-reduced-motion:reduce){
  *{scroll-behavior:auto!important;transition:none!important;animation:none!important}
}