:root{
  --blue:#2B6FD6;
  --blue-d:#225BB0;
  --blue-l:#4A90E2;
  --ink:#1D2632;
  --ink2:#4A5564;
  --mute:#758196;
  --line:#E6EBF1;
  --bg:#FAFBFC;
  --tint:#F2F7FE;
  --green:#138A62;
  --amber:#A56316;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;scroll-padding-top:84px}
body{
  background:#fff;
  color:var(--ink);
  font-family:"Noto Sans JP","Yu Gothic UI",sans-serif;
  line-height:1.8;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
button{font:inherit}
svg{display:block}
.wrap{width:min(1080px,calc(100% - 48px));margin-inline:auto}
.site-header{
  position:sticky;
  z-index:50;
  top:0;
  border-bottom:1px solid var(--line);
  background:rgba(255,255,255,.96);
  transition:box-shadow .2s ease;
}
.site-header.is-scrolled{box-shadow:0 8px 24px rgba(29,38,50,.07)}
.nav{display:flex;align-items:center;gap:28px;height:64px}
.brand{display:flex;align-items:center;gap:9px}
.brand-logo{width:30px;height:30px}
.brand b{
  font-family:"Lexend","Noto Sans JP",sans-serif;
  font-size:19px;
  letter-spacing:-.4px;
}
.brand .zip{color:var(--blue)}
.nav-links{display:flex;align-items:center;gap:26px;margin-left:18px;color:var(--ink2);font-size:14px}
.nav-links a{display:inline-flex;align-items:center;min-height:44px}
.nav-links a:hover,.nav-links a[aria-current="page"]{color:var(--blue-d)}
.nav-links a[aria-current="page"]{font-weight:700}
.download{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  min-height:42px;
  margin-left:auto;
  border-radius:9px;
  background:var(--blue);
  box-shadow:0 6px 16px rgba(43,111,214,.24);
  color:#fff;
  font-size:14px;
  font-weight:700;
  padding:9px 18px;
  transition:background .15s ease,transform .15s ease;
}
.download:hover{background:var(--blue-d);transform:translateY(-1px)}
.menu{display:none;margin-left:auto}
.menu summary{cursor:pointer;font-size:14px;font-weight:700;list-style:none;padding:10px}
.menu summary::-webkit-details-marker{display:none}
.menu-panel{
  position:fixed;
  top:65px;
  right:0;
  left:0;
  display:grid;
  gap:4px;
  border-bottom:1px solid var(--line);
  background:#fff;
  box-shadow:0 18px 40px rgba(20,40,80,.14);
  padding:16px 24px 22px;
}
.menu-panel a{min-height:44px;border-radius:8px;padding:9px 10px}
.menu-panel a:hover,.menu-panel a[aria-current="page"]{background:var(--tint);color:var(--blue-d)}
.reading-progress{
  position:absolute;
  bottom:-1px;
  left:0;
  width:100%;
  height:2px;
  background:linear-gradient(90deg,var(--blue),var(--blue-l));
  transform:scaleX(0);
  transform-origin:left;
  will-change:transform;
}
.breadcrumbs{display:flex;flex-wrap:wrap;gap:7px;padding-top:24px;color:var(--mute);font-size:12px}
.breadcrumbs a:hover{color:var(--blue)}
.format-hero{
  position:relative;
  overflow:hidden;
  border-bottom:1px solid var(--line);
  background:
    radial-gradient(circle at 82% 12%,rgba(74,144,226,.12),transparent 30%),
    linear-gradient(180deg,#fff,var(--tint));
}
.format-hero .wrap{padding-bottom:52px}
.hero-grid{
  display:grid;
  grid-template-columns:minmax(0,1fr) 290px;
  align-items:center;
  gap:56px;
  padding-top:34px;
}
.eyebrow{
  color:var(--blue);
  font-family:"Lexend","Noto Sans JP",sans-serif;
  font-size:11px;
  font-weight:700;
  letter-spacing:.16em;
}
h1{
  max-width:760px;
  margin-top:10px;
  font-size:clamp(30px,4.2vw,45px);
  line-height:1.33;
  letter-spacing:-.7px;
}
.direct-answer{
  max-width:720px;
  margin-top:18px;
  color:var(--ink2);
  font-size:16px;
}
.hero-note{margin-top:14px;color:var(--mute);font-size:12.5px}
.extension-tile{
  position:relative;
  display:grid;
  min-height:218px;
  place-items:center;
  overflow:hidden;
  border:1px solid #cfdef2;
  border-radius:28px;
  background:rgba(255,255,255,.88);
  box-shadow:0 24px 60px rgba(43,111,214,.13);
}
.extension-tile::before{
  position:absolute;
  top:-28px;
  right:-20px;
  width:110px;
  height:110px;
  border-radius:34px;
  background:var(--blue);
  content:"";
  opacity:.08;
  transform:rotate(14deg);
}
.extension-mark{
  display:flex;
  align-items:baseline;
  color:var(--blue-d);
  font-family:"Lexend","Noto Sans JP",sans-serif;
  font-size:clamp(34px,5vw,55px);
  font-weight:700;
  letter-spacing:-1px;
}
.extension-mark small{color:var(--blue-l);font-size:.55em}
.extension-tile span:last-child{
  position:absolute;
  bottom:23px;
  color:var(--mute);
  font-size:11px;
  font-weight:700;
  letter-spacing:.1em;
}
.article-layout{
  display:grid;
  grid-template-columns:minmax(0,720px) 280px;
  align-items:start;
  gap:52px;
  padding-top:50px;
  padding-bottom:76px;
}
.article{min-width:0;overflow-x:clip}
.answer-card{
  border:1px solid #cfe0f7;
  border-radius:15px;
  background:linear-gradient(145deg,#fff,var(--tint));
  padding:23px 24px;
}
.answer-card .label{color:var(--blue-d);font-size:11px;font-weight:700;letter-spacing:.1em}
.answer-card p{margin-top:7px;font-size:15px}
.article section{margin-top:48px}
.article h2{font-size:26px;line-height:1.45;letter-spacing:-.35px}
.article h2::after{
  display:block;
  width:34px;
  height:3px;
  margin-top:11px;
  border-radius:3px;
  background:var(--blue);
  content:"";
}
.article h3{margin-top:27px;font-size:18px;line-height:1.55}
.article p{margin-top:15px;color:var(--ink2)}
.article strong{color:var(--ink)}
.article a:not(.button){color:var(--blue-d);text-decoration:underline;text-decoration-color:#b9cff0;text-underline-offset:3px}
.callout{
  margin-top:20px;
  border-left:4px solid var(--blue);
  border-radius:0 12px 12px 0;
  background:var(--tint);
  padding:17px 19px;
  color:var(--ink2);
  font-size:14px;
}
.callout.caution{border-left-color:var(--amber);background:#fff8ed}
.choice-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:21px}
.choice-card{border:1px solid var(--line);border-radius:15px;background:#fff;padding:20px}
.choice-card.recommended{border-color:#b9cff0;background:var(--tint)}
.choice-card .choice-label{display:inline-flex;border-radius:999px;background:#edf4fd;color:var(--blue-d);font-size:10.5px;font-weight:700;padding:4px 9px}
.choice-card h3{margin-top:10px;font-size:17px}
.choice-card p{margin-top:7px;font-size:13.5px}
.article-figure{margin-top:24px}
.article-figure img{display:block;width:auto;max-width:100%;height:auto;margin-inline:auto;border:1px solid var(--line);border-radius:16px;background:var(--bg)}
.article-figure figcaption{margin-top:8px;color:var(--mute);font-size:12px;line-height:1.6}
.table-wrap{max-width:100%;margin-top:20px;overflow-x:auto;border-radius:14px}
.table-wrap .fact-table{min-width:620px;margin-top:0}
.checklist{display:grid;gap:10px;margin-top:20px;list-style:none}
.checklist li{position:relative;border:1px solid var(--line);border-radius:12px;background:#fff;color:var(--ink2);font-size:14px;padding:13px 15px 13px 45px}
.checklist li::before{position:absolute;top:13px;left:15px;display:grid;width:21px;height:21px;place-items:center;border-radius:50%;background:#e9f7f1;color:var(--green);content:"✓";font-size:12px;font-weight:700}
.steps{display:grid;gap:13px;margin-top:22px;list-style:none}
.step{
  display:grid;
  grid-template-columns:38px 1fr;
  gap:14px;
  border:1px solid var(--line);
  border-radius:14px;
  background:#fff;
  padding:17px 18px;
}
.step-number{
  display:grid;
  width:34px;
  height:34px;
  place-items:center;
  border-radius:50%;
  background:var(--blue);
  color:#fff;
  font-family:"Lexend",sans-serif;
  font-size:13px;
  font-weight:700;
}
.step h3{margin:0;font-size:16px}
.step p{margin-top:3px;font-size:13.5px}
.fact-table{
  width:100%;
  margin-top:20px;
  border-collapse:separate;
  border-spacing:0;
  overflow:hidden;
  border:1px solid var(--line);
  border-radius:14px;
  font-size:13.5px;
}
.fact-table caption{margin-bottom:8px;color:var(--mute);font-size:11.5px;text-align:left}
.fact-table th,.fact-table td{border-bottom:1px solid var(--line);padding:13px 16px;text-align:left;vertical-align:top}
.fact-table tr:last-child th,.fact-table tr:last-child td{border-bottom:0}
.fact-table th{width:32%;background:var(--bg);color:var(--ink);font-weight:700}
.fact-table thead th{width:auto;background:#edf4fd}
.fact-table td{color:var(--ink2)}
.faq-list{display:grid;gap:10px;margin-top:21px}
.faq-list details{border:1px solid var(--line);border-radius:12px;background:#fff;padding:0 18px}
.faq-list summary{cursor:pointer;list-style:none;padding:17px 28px 17px 0;font-weight:700;position:relative}
.faq-list summary::-webkit-details-marker{display:none}
.faq-list summary::after{position:absolute;top:17px;right:0;color:var(--blue);content:"＋";font-size:19px;line-height:1}
.faq-list details[open] summary::after{content:"−"}
.faq-list details p{margin:0;border-top:1px solid var(--line);padding:14px 0 17px;font-size:14px}
.source-list{display:grid;gap:10px;margin-top:18px;list-style:none}
.source-list li{border-left:2px solid var(--line);padding-left:14px;color:var(--ink2);font-size:13.5px}
.source-list b{display:block;color:var(--ink);font-size:12px}
.source-list a{display:block;width:max-content;max-width:100%;margin-top:2px;color:var(--blue-d);overflow-wrap:anywhere;text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:3px}
.source-list span{display:block;margin-top:3px}
.verification-card{margin-top:18px;border:1px solid #cfe0f7;border-radius:15px;background:var(--tint);padding:20px}
.verification-card dl{display:grid;gap:10px}
.verification-card dl div{display:grid;grid-template-columns:92px minmax(0,1fr);gap:14px}
.verification-card dt{color:var(--blue-d);font-size:12px;font-weight:700}
.verification-card dd{color:var(--ink2);font-size:13.5px}
.verification-card p{margin-top:14px;border-top:1px solid #d8e6f8;padding-top:13px;color:var(--ink2);font-size:13px}
.related{display:flex;flex-wrap:wrap;gap:9px;margin-top:18px}
.related a{
  border:1px solid var(--line);
  border-radius:999px;
  background:#fff;
  color:var(--blue-d);
  font-size:13px;
  font-weight:700;
  padding:8px 13px;
  transition:border-color .15s ease,background .15s ease;
}
.related a:hover{border-color:#b9cff0;background:var(--tint)}
.side{position:sticky;top:88px}
.side-card{border:1px solid var(--line);border-radius:15px;background:#fff;padding:20px}
.side-card + .side-card{margin-top:14px}
.side-title{font-size:13px;font-weight:700}
.side-facts{display:grid;gap:12px;margin-top:15px}
.side-facts div{border-top:1px solid var(--line);padding-top:10px}
.side-facts dt{color:var(--mute);font-size:10.5px;font-weight:700;letter-spacing:.07em}
.side-facts dd{margin-top:2px;color:var(--ink2);font-size:13px}
.status{
  display:inline-flex;
  align-items:center;
  gap:6px;
  border-radius:999px;
  background:#edf8f3;
  color:var(--green);
  font-size:11.5px;
  font-weight:700;
  padding:6px 10px;
}
.status::before{width:7px;height:7px;border-radius:50%;background:currentColor;content:""}
.toc{display:grid;gap:3px;margin-top:12px}
.toc a{border-radius:7px;color:var(--ink2);font-size:12.5px;padding:6px 8px}
.toc a:hover{background:var(--tint);color:var(--blue-d)}
.cta-card{
  overflow:hidden;
  margin-top:50px;
  border-radius:18px;
  background:var(--ink);
  color:#fff;
  padding:29px;
}
.cta-card h2{font-size:22px}
.cta-card h2::after{background:var(--blue-l)}
.cta-card p{color:#cfd8e5;font-size:14px}
.button{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  min-height:44px;
  margin-top:18px;
  border-radius:9px;
  background:var(--blue);
  color:#fff;
  font-size:14px;
  font-weight:700;
  padding:10px 18px;
}
.button:hover{background:var(--blue-l)}
.site-footer{
  content-visibility:auto;
  contain-intrinsic-size:auto 310px;
  border-top:1px solid var(--line);
  background:var(--bg);
  padding:46px 0 27px;
}
.footer-grid{display:grid;grid-template-columns:1.4fr repeat(3,1fr);gap:32px}
.footer-grid p{margin-top:9px;color:var(--mute);font-size:12px}
.footer-col h2{font-size:13px}
.footer-col a{display:block;color:var(--mute);font-size:12.5px;padding:4px 0}
.footer-col a:hover{color:var(--blue)}
.copyright{margin-top:30px;border-top:1px solid var(--line);padding-top:17px;color:var(--mute);font-size:11.5px}
a:focus-visible,button:focus-visible,summary:focus-visible{outline:3px solid rgba(43,111,214,.32);outline-offset:3px;border-radius:8px}
@media(max-width:880px){
  .nav-links{display:none}
  .menu{display:block}
  .download{margin-left:0}
  .hero-grid{grid-template-columns:1fr 220px;gap:30px}
  .article-layout{grid-template-columns:minmax(0,1fr) 240px;gap:32px}
}
@media(max-width:720px){
  .wrap{width:min(100% - 40px,1080px)}
  .hero-grid{grid-template-columns:1fr;padding-top:25px}
  .extension-tile{min-height:138px;border-radius:20px}
  .extension-tile span:last-child{bottom:13px}
  .article-layout{display:block;padding-top:34px}
  .side{position:static;margin-top:36px}
  .side .side-card:last-child{display:none}
  .article section{margin-top:41px}
  .article h2{font-size:23px}
  .choice-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:460px){
  .wrap{width:min(100% - 32px,1080px)}
  .nav{gap:5px}
  .brand-logo{width:28px;height:28px}
  .brand b{font-size:17px}
  .download{padding-inline:12px;font-size:12.5px}
  .format-hero .wrap{padding-bottom:38px}
  h1{font-size:29px}
  .direct-answer{font-size:14.5px}
  .article-layout{padding-bottom:56px}
  .answer-card{padding:19px}
  .step{grid-template-columns:32px 1fr;padding:15px 14px}
  .step-number{width:30px;height:30px}
  .fact-table th{width:38%}
  .fact-table th,.fact-table td{padding:11px 10px}
  .verification-card dl div{grid-template-columns:1fr;gap:2px}
  .footer-grid{grid-template-columns:1fr}
}
@media(prefers-reduced-motion:no-preference){
  .hero-copy{animation:format-in .45s cubic-bezier(.22,.8,.28,1) both}
  .extension-tile{animation:tile-in .52s .05s cubic-bezier(.22,.8,.28,1) both}
  @keyframes format-in{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}
  @keyframes tile-in{from{opacity:0;transform:translateY(10px) rotate(1deg)}to{opacity:1;transform:none}}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}
  .reading-progress{display:none}
}