:root{
  --c-ink:#10213f;
  --c-text:#283750;
  --c-muted:#516079;
  --c-primary:#1d4ed8;
  --c-primary-strong:#1a3fae;
  --c-primary-ink:#16327c;
  --c-accent:#2563eb;
  --c-sky-50:#eff6ff;
  --c-sky-100:#dbeafe;
  --c-sky-200:#bfdbfe;
  --c-surface:#f4f7ff;
  --c-card:#ffffff;
  --c-border:#d9e2f3;
  --c-border-soft:#e8eefb;
  --c-white:#ffffff;
  --c-on-primary:#ffffff;
  --c-focus:#0b3bc4;
  --radius-sm:10px;
  --radius:16px;
  --radius-lg:24px;
  --shadow-sm:0 1px 2px rgba(16,33,63,.06),0 1px 3px rgba(16,33,63,.08);
  --shadow:0 6px 18px rgba(20,40,90,.08),0 2px 6px rgba(20,40,90,.06);
  --shadow-lg:0 18px 48px rgba(20,40,90,.14);
  --maxw:1120px;
  --pad:clamp(1rem,4vw,2rem);
  --font:-apple-system,BlinkMacSystemFont,"Segoe UI","Hiragino Sans","Hiragino Kaku Gothic ProN","Noto Sans JP","Yu Gothic",YuGothic,Meiryo,Roboto,Helvetica,Arial,sans-serif;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  font-family:var(--font);
  font-size:1.0625rem;
  line-height:1.8;
  color:var(--c-text);
  background:var(--c-white);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow-wrap:break-word;
  word-break:normal;
}
img,svg,video{max-width:100%;height:auto;display:block}
a{color:var(--c-primary);text-underline-offset:.18em}
a:hover{color:var(--c-primary-strong)}
h1,h2,h3,h4{color:var(--c-ink);line-height:1.35;font-weight:800;letter-spacing:.01em}
h1{font-size:clamp(1.7rem,1.1rem + 2.6vw,2.6rem);margin:0 0 .6em}
h2{font-size:clamp(1.35rem,1rem + 1.6vw,1.85rem);margin:2.2em 0 .7em}
h3{font-size:clamp(1.12rem,.95rem + .8vw,1.35rem);margin:1.8em 0 .5em}
p{margin:0 0 1.1em}
ul,ol{margin:0 0 1.2em;padding-left:1.4em}
li{margin:.35em 0}
strong{color:var(--c-ink);font-weight:700}
hr{border:0;border-top:1px solid var(--c-border);margin:2.4em 0}
:focus-visible{outline:3px solid var(--c-focus);outline-offset:2px;border-radius:4px}
.site-footer :focus-visible{outline-color:#ffffff}
.skip-link{position:absolute;left:50%;transform:translateX(-50%) translateY(-150%);top:8px;z-index:200;background:var(--c-primary);color:var(--c-on-primary);padding:.65rem 1.1rem;border-radius:999px;font-weight:700;text-decoration:none;transition:transform .18s ease}
.skip-link:focus{transform:translateX(-50%) translateY(0);color:var(--c-on-primary)}
.container{width:100%;max-width:var(--maxw);margin-inline:auto;padding-inline:var(--pad)}
.visually-hidden{position:absolute!important;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.section{padding-block:clamp(2.6rem,1.8rem + 3vw,4.6rem)}
.section--tint{background:var(--c-surface)}
.section__head{max-width:60ch;margin:0 auto 2.2rem;text-align:center}
.section__head p{color:var(--c-muted);margin:0}
.eyebrow{display:inline-block;font-size:.82rem;font-weight:800;letter-spacing:.14em;color:var(--c-primary);background:var(--c-sky-100);padding:.35rem .8rem;border-radius:999px;margin-bottom:1rem}

.site-header{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.92);backdrop-filter:saturate(140%) blur(8px);border-bottom:1px solid var(--c-border-soft)}
.site-header__inner{display:flex;align-items:center;justify-content:space-between;gap:1rem;min-height:66px}
.brand{display:inline-flex;align-items:center;gap:.6rem;text-decoration:none;color:var(--c-ink);font-weight:800;font-size:1.18rem;letter-spacing:.04em}
.brand img{width:38px;height:38px}
.brand:hover{color:var(--c-primary)}
.nav-toggle{position:absolute;opacity:0;pointer-events:none;width:1px;height:1px}
@media (min-width:761px){.nav-toggle{display:none}}
.nav-burger{display:none;align-items:center;justify-content:center;width:46px;height:46px;border-radius:12px;border:1px solid var(--c-border);background:var(--c-white);color:var(--c-ink);cursor:pointer}
.nav-burger span{position:relative;width:20px;height:2px;background:currentColor;border-radius:2px;display:block}
.nav-burger span::before,.nav-burger span::after{content:"";position:absolute;left:0;width:20px;height:2px;background:currentColor;border-radius:2px}
.nav-burger span::before{top:-6px}
.nav-burger span::after{top:6px}
.nav-burger span,.nav-burger span::before,.nav-burger span::after{transition:transform .2s ease,top .2s ease,background-color .2s ease}
.nav-toggle:focus-visible ~ .nav-burger{outline:3px solid var(--c-focus);outline-offset:2px}
.nav-toggle:checked ~ .nav-burger span{background:transparent}
.nav-toggle:checked ~ .nav-burger span::before{top:0;transform:rotate(45deg)}
.nav-toggle:checked ~ .nav-burger span::after{top:0;transform:rotate(-45deg)}
.main-nav ul{display:flex;align-items:center;gap:.4rem;list-style:none;margin:0;padding:0}
.main-nav a{display:inline-flex;align-items:center;min-height:44px;padding:.4rem .85rem;border-radius:10px;text-decoration:none;color:var(--c-ink);font-weight:600;font-size:.98rem}
.main-nav a:hover{background:var(--c-sky-50);color:var(--c-primary)}
.main-nav a[aria-current="page"]{color:var(--c-primary);background:var(--c-sky-100)}

.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;min-height:48px;padding:.7rem 1.4rem;border-radius:999px;font-weight:700;font-size:1rem;text-decoration:none;cursor:pointer;border:2px solid transparent;transition:transform .15s ease,background-color .15s ease,box-shadow .15s ease}
.btn:active{transform:translateY(1px)}
.btn--primary{background:var(--c-primary);color:var(--c-on-primary);box-shadow:var(--shadow)}
.btn--primary:hover{background:var(--c-primary-strong);color:var(--c-on-primary)}
.btn--ghost{background:var(--c-white);color:var(--c-primary);border-color:var(--c-sky-200)}
.btn--ghost:hover{background:var(--c-sky-50);color:var(--c-primary-strong)}

.hero{background:linear-gradient(180deg,var(--c-sky-50),var(--c-white))}
.hero__grid{display:grid;grid-template-columns:1.1fr .9fr;gap:clamp(1.5rem,4vw,3.5rem);align-items:center;padding-block:clamp(2.4rem,1.6rem + 3vw,4.4rem)}
.hero__title{margin-bottom:.5em}
.hero__lead{font-size:clamp(1.02rem,.97rem + .4vw,1.2rem);color:var(--c-muted);max-width:46ch}
.hero__actions{display:flex;flex-wrap:wrap;gap:.8rem;margin-top:1.6rem}
.hero__art{display:flex;justify-content:center}
.hero__art-wrap{position:relative;width:min(360px,80%);aspect-ratio:1;display:grid;place-items:center}
.hero__art-wrap::before{content:"";position:absolute;inset:0;background:radial-gradient(circle at 50% 45%,var(--c-sky-100),transparent 68%);border-radius:50%}
.hero__art img{position:relative;width:78%}

.grid{display:grid;gap:1.4rem}
.grid--feat{grid-template-columns:repeat(auto-fit,minmax(230px,1fr))}
.grid--guides{grid-template-columns:repeat(auto-fit,minmax(280px,1fr))}
.card{background:var(--c-card);border:1px solid var(--c-border-soft);border-radius:var(--radius);padding:1.6rem;box-shadow:var(--shadow-sm);transition:transform .18s ease,box-shadow .18s ease,border-color .18s ease}
.card--feat{height:100%}
.card-ico{display:inline-grid;place-items:center;width:54px;height:54px;border-radius:14px;background:var(--c-sky-100);color:var(--c-primary);margin-bottom:1rem}
.card-ico svg{width:28px;height:28px}
.card h3{margin:.1em 0 .4em}
.card p{color:var(--c-muted);margin:0;font-size:.99rem}

.guide-card{display:flex;flex-direction:column;overflow:hidden;padding:0}
.guide-card:hover,.guide-card:focus-within{transform:translateY(-3px);box-shadow:var(--shadow);border-color:var(--c-sky-200)}
.guide-card__media{aspect-ratio:16/9;background:var(--c-sky-100);overflow:hidden}
.guide-card__media img{width:100%;height:100%;object-fit:cover}
.guide-card__body{padding:1.3rem 1.4rem 1.5rem;display:flex;flex-direction:column;gap:.55rem;flex:1}
.guide-card__tag{font-size:.78rem;font-weight:800;letter-spacing:.1em;color:var(--c-primary)}
.guide-card__body h3{margin:0;font-size:1.16rem;line-height:1.45}
.guide-card__body h3 a{color:var(--c-ink);text-decoration:none}
.guide-card__body h3 a:hover{color:var(--c-primary)}
.guide-card__excerpt{color:var(--c-muted);font-size:.96rem;margin:0}
.guide-card__more{margin-top:auto;font-weight:700;color:var(--c-primary);text-decoration:none;display:inline-flex;align-items:center;gap:.35rem}
.guide-card__more svg{flex:0 0 auto;width:18px;height:18px}
.guide-card:hover .guide-card__more{gap:.55rem}

.feature-band{background:linear-gradient(135deg,var(--c-primary),var(--c-primary-strong));color:var(--c-on-primary);border-radius:var(--radius-lg);padding:clamp(1.8rem,1.2rem + 2vw,3rem);display:grid;grid-template-columns:auto 1fr;gap:1.5rem;align-items:center}
.feature-band h2{color:var(--c-on-primary);margin:0 0 .4em}
.feature-band p{color:var(--c-sky-100);margin:0;max-width:62ch}
.feature-band__ico{display:grid;place-items:center;width:74px;height:74px;border-radius:20px;background:rgba(255,255,255,.16)}
.feature-band__ico svg{width:38px;height:38px;color:#fff}

.prose{max-width:none}
.article-wrap{display:grid;grid-template-columns:minmax(0,1fr);gap:0;padding-block:clamp(1.6rem,1rem + 2vw,3rem)}
.article{max-width:760px;margin-inline:auto;width:100%}
.article__media{margin:1.4rem 0 1.8rem;border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow-sm)}
.article__media img{width:100%;height:auto}
.article p,.article li{color:var(--c-text)}
.article h2{padding-top:.2em;border-top:1px solid var(--c-border-soft)}
.article h2:first-of-type{border-top:0}

.breadcrumb{font-size:.9rem;color:var(--c-muted);margin:0 0 .4rem}
.breadcrumb ol{list-style:none;display:flex;flex-wrap:wrap;gap:.4rem;padding:0;margin:0}
.breadcrumb li{display:inline-flex;align-items:center;gap:.4rem;margin:0}
.breadcrumb li+li::before{content:"/";color:var(--c-border)}
.breadcrumb a{text-decoration:underline;text-underline-offset:.15em;color:var(--c-muted)}
.breadcrumb a:hover{color:var(--c-primary)}
.article__meta{display:flex;flex-wrap:wrap;gap:.6rem 1.2rem;color:var(--c-muted);font-size:.92rem;margin:.6rem 0 0}
.article__meta time{font-weight:600}

.summary-card{background:var(--c-sky-50);border:1px solid var(--c-sky-200);border-left:5px solid var(--c-primary);border-radius:var(--radius);padding:1.3rem 1.5rem;margin:1.6rem 0 2rem}
.summary-card h2{margin:0 0 .6em;font-size:1.15rem;border:0;padding:0;color:var(--c-primary-ink)}
.summary-card ul{margin:0;padding-left:1.2em}
.summary-card li{margin:.4em 0}

.notice{border-radius:var(--radius-sm);padding:1.05rem 1.25rem;margin:1.6rem 0;border:1px solid var(--c-border);background:var(--c-surface)}
.notice strong{display:block;margin-bottom:.25em;color:var(--c-ink)}
.notice--info{background:var(--c-sky-50);border-color:var(--c-sky-200)}
.notice--note{background:#f7f9fc;border-color:var(--c-border)}

.steps{list-style:none;counter-reset:step;padding:0;margin:1.4rem 0}
.steps>li{position:relative;counter-increment:step;padding:1.05rem 1.2rem 1.05rem 3.5rem;margin:.7rem 0;background:var(--c-card);border:1px solid var(--c-border-soft);border-radius:var(--radius-sm);box-shadow:var(--shadow-sm)}
.steps>li::before{content:counter(step);position:absolute;left:1rem;top:1rem;width:30px;height:30px;display:grid;place-items:center;border-radius:50%;background:var(--c-primary);color:#fff;font-weight:800;font-size:.95rem}
.steps>li strong{display:block;margin-bottom:.15em}

.table-wrap{overflow-x:auto;margin:1.5rem 0;border:1px solid var(--c-border);border-radius:var(--radius-sm)}
table{border-collapse:collapse;width:100%;min-width:460px;font-size:.98rem}
caption{caption-side:top;text-align:left;color:var(--c-muted);font-size:.9rem;padding:.2rem .2rem .7rem}
th,td{padding:.8rem 1rem;text-align:left;border-bottom:1px solid var(--c-border-soft);vertical-align:top}
thead th{background:var(--c-sky-50);color:var(--c-ink);font-weight:700;border-bottom:2px solid var(--c-sky-200)}
tbody tr:last-child td{border-bottom:0}

.faq{margin:1.4rem 0}
.faq details{border:1px solid var(--c-border);border-radius:var(--radius-sm);padding:0 1.2rem;margin:.7rem 0;background:var(--c-card)}
.faq summary{cursor:pointer;font-weight:700;color:var(--c-ink);padding:1rem 0;list-style:none;display:flex;justify-content:space-between;align-items:center;gap:1rem}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font-size:1.4rem;color:var(--c-primary);line-height:1}
.faq details[open] summary::after{content:"\2212"}
.faq details>p{margin:0 0 1rem;color:var(--c-muted)}

.related{margin-top:2.6rem;padding-top:1.6rem;border-top:1px solid var(--c-border)}
.related h2{margin-top:0;border:0;padding:0;font-size:1.25rem}
.related ul{list-style:none;padding:0;margin:0;display:grid;gap:.8rem}
.related a{display:flex;align-items:center;gap:.8rem;padding:1rem 1.2rem;border:1px solid var(--c-border-soft);border-radius:var(--radius-sm);text-decoration:none;color:var(--c-ink);font-weight:600;background:var(--c-card);transition:border-color .15s ease,background-color .15s ease}
.related a:hover{border-color:var(--c-sky-200);background:var(--c-sky-50);color:var(--c-primary)}
.related a svg{flex:0 0 auto;width:22px;height:22px;color:var(--c-primary)}

.author{display:flex;gap:1rem;align-items:center;margin-top:2.4rem;padding:1.3rem 1.4rem;background:var(--c-surface);border:1px solid var(--c-border-soft);border-radius:var(--radius)}
.author__img{flex:0 0 auto;width:56px;height:56px;border-radius:50%;background:var(--c-sky-100);padding:6px}
.author__name{font-weight:800;color:var(--c-ink);margin:0}
.author__role{margin:.1em 0 0;color:var(--c-muted);font-size:.92rem}

.legal h2{font-size:1.3rem}
.legal .container,.page-head .container{max-width:820px}
.page-head{background:linear-gradient(180deg,var(--c-sky-50),var(--c-white));padding-block:clamp(2rem,1.4rem + 2vw,3.4rem)}
.page-head p{color:var(--c-muted);margin:.4rem 0 0;max-width:60ch}
.contact-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:1.2rem;margin:1.6rem 0}
.contact-card{background:var(--c-card);border:1px solid var(--c-border-soft);border-radius:var(--radius);padding:1.4rem;box-shadow:var(--shadow-sm)}
.contact-card h3{margin:.1em 0 .4em;font-size:1.08rem}
.contact-card a{font-weight:700;word-break:break-all}

.site-footer{background:var(--c-ink);color:#c7d4ec;padding-block:2.8rem 1.6rem;margin-top:2rem}
.site-footer a{color:#dbe6fb;text-decoration:none}
.site-footer a:hover{color:#fff;text-decoration:underline}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:2rem}
.footer-brand{display:inline-flex;align-items:center;gap:.6rem;color:#fff;font-weight:800;font-size:1.12rem;letter-spacing:.04em;text-decoration:none;margin-bottom:.8rem}
.footer-brand img{width:34px;height:34px}
.footer-about{font-size:.94rem;color:#aebdda;max-width:38ch;margin:0 0 1rem}
.footer-col h4{color:#fff;font-size:.82rem;letter-spacing:.12em;text-transform:uppercase;margin:0 0 .9rem}
.footer-col ul{list-style:none;padding:0;margin:0;display:grid;gap:.55rem}
.footer-social{display:flex;gap:.6rem;margin-top:.4rem}
.footer-social a{display:grid;place-items:center;width:42px;height:42px;border-radius:12px;background:rgba(255,255,255,.08)}
.footer-social a:hover{background:rgba(255,255,255,.16)}
.footer-social svg{width:20px;height:20px;color:#fff}
.footer-bottom{border-top:1px solid rgba(255,255,255,.12);margin-top:2rem;padding-top:1.3rem;display:flex;flex-wrap:wrap;gap:.6rem 1.4rem;justify-content:space-between;font-size:.86rem;color:#9fb0d2}
.footer-bottom nav{display:flex;flex-wrap:wrap;gap:.4rem 1.1rem}

@media (max-width:860px){
  .footer-grid{grid-template-columns:1fr 1fr}
  .footer-brand-col{grid-column:1 / -1}
  .feature-band{grid-template-columns:1fr;text-align:center}
  .feature-band__ico{margin-inline:auto}
}
@media (max-width:760px){
  .hero__grid{grid-template-columns:1fr;text-align:center}
  .hero__lead{margin-inline:auto}
  .hero__actions{justify-content:center}
  .hero__art{order:-1}
  .nav-burger{display:inline-flex}
  .main-nav{position:absolute;inset:66px 0 auto;background:var(--c-white);border-bottom:1px solid var(--c-border);box-shadow:var(--shadow);max-height:0;overflow:hidden;transition:max-height .26s ease;visibility:hidden}
  .main-nav ul{flex-direction:column;align-items:stretch;gap:0;padding:.6rem var(--pad) 1rem}
  .main-nav a{min-height:50px;border-radius:10px;font-size:1.05rem}
  .nav-toggle:checked ~ .main-nav{max-height:80vh;visibility:visible}
}
@media (max-width:520px){
  .footer-grid{grid-template-columns:1fr}
  .footer-bottom{flex-direction:column}
}
.u-center{text-align:center}
.u-mt-lg{margin-top:1.6rem}
.u-mx-auto{margin-inline:auto}
.error-art{width:min(200px,60%);margin:0 auto 1rem}
.lead{font-size:clamp(1.02rem,.97rem + .4vw,1.18rem);color:var(--c-muted)}
.lead--center{margin-inline:auto}
.prose>:first-child{margin-top:0}
@media (prefers-reduced-motion:reduce){
  *{animation-duration:.001ms!important;animation-iteration-count:1!important;transition-duration:.001ms!important;scroll-behavior:auto!important}
}