:root{
  --color-bg:#FFFFFF;
  --color-ink:#1A1A1A;
  --color-sub:#4A4A4A;
  --color-mute:#767676;
  --color-line:#E5E5E5;
  --font-jp:"Noto Sans JP","Hiragino Kaku Gothic ProN","Yu Gothic",system-ui,sans-serif;
  --font-en:"Noto Sans JP","Hiragino Kaku Gothic ProN","Yu Gothic",system-ui,sans-serif;
  --max:1120px;
  --pad-x:clamp(20px,4vw,32px);
  --section-pad:clamp(72px,10vw,120px);
  --radius:4px;
}
html{scroll-behavior:smooth}

/* ---------- skip link ---------- */
.skip-link{position:absolute;top:-48px;left:12px;background:var(--color-ink);color:#fff;padding:10px 16px;border-radius:var(--radius);font-size:14px;z-index:100;transition:top .15s}
.skip-link:focus{top:12px}

body{
  font-family:var(--font-jp);
  font-size:16px;
  color:var(--color-ink);
  background:var(--color-bg);
  font-feature-settings:"palt";
}
@media(min-width:768px){body{font-size:17px}}

/* ---------- layout ---------- */
.container{max-width:var(--max);margin-inline:auto;padding-inline:var(--pad-x)}
.section{padding-block:var(--section-pad)}
.section--tight{padding-block:clamp(48px,7vw,80px)}
.section--alt{background:#FAFAFA}

/* ---------- typography ---------- */
h1,h2,h3{font-family:var(--font-jp);line-height:1.35;letter-spacing:.02em}
.h1{font-size:clamp(32px,5.5vw,60px);font-weight:700;letter-spacing:.04em}
.h2{
  font-size:clamp(26px,3.6vw,40px);
  font-weight:700;
  letter-spacing:.03em;
  line-height:1.5;
  margin-bottom:.8em;
}
.h2__accent{
  display:inline-block;
  position:relative;
  font-size:1.28em;
  letter-spacing:.02em;
  padding:0 .08em;
}
.h2__accent::after{
  content:"";
  position:absolute;
  left:0;
  right:0;
  bottom:.05em;
  height:2px;
  background:var(--color-ink);
}
.h3{font-size:clamp(18px,2vw,24px);font-weight:500;margin-bottom:.5em}
.lead{font-size:clamp(16px,1.8vw,18px);color:var(--color-sub);max-width:52ch}
.small{font-size:14px;color:var(--color-sub)}
.en{font-family:var(--font-en);letter-spacing:.08em}
.center{text-align:center}
.eyebrow{font-family:var(--font-en);font-size:13px;letter-spacing:.24em;color:var(--color-mute);text-transform:uppercase;margin-bottom:1.2em;display:block}

/* ---------- header ---------- */
.site-header{position:sticky;top:0;background:rgba(255,255,255,.94);backdrop-filter:blur(8px);border-bottom:1px solid var(--color-line);z-index:50}
.site-header__inner{display:flex;align-items:center;justify-content:space-between;height:64px;gap:24px}
.site-header__logo{display:flex;align-items:center;gap:12px}
.site-header__logo img{height:40px;width:40px;flex-shrink:0}
.site-header__logo-text{display:flex;flex-direction:column;line-height:1.15}
.site-header__logo-text small{font-size:10px;letter-spacing:.2em;color:var(--color-sub);margin-bottom:2px}
.site-header__logo-text strong{font-size:18px;font-weight:700;letter-spacing:.14em;color:var(--color-ink)}
@media(max-width:480px){
  .site-header__logo-text small{font-size:9px;letter-spacing:.15em}
  .site-header__logo-text strong{font-size:15px}
}
.nav{display:none}
.nav ul{display:flex;gap:clamp(16px,2.4vw,32px)}
.nav a{font-size:14px;color:var(--color-sub);transition:color .15s}
.nav a:hover{color:var(--color-ink)}
.nav a[aria-current="page"]{color:var(--color-ink);font-weight:500}
.nav-toggle{width:36px;height:36px;display:flex;flex-direction:column;justify-content:center;gap:6px;padding:0 6px}
@media(min-width:900px){
  .nav{display:block}
  .nav-toggle{display:none}
}
.nav-toggle span{display:block;width:24px;height:1.5px;background:var(--color-ink);transition:transform .2s,opacity .2s}
.nav-toggle[aria-expanded="true"] span:nth-child(1){transform:translateY(7.5px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] span:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] span:nth-child(3){transform:translateY(-7.5px) rotate(-45deg)}
.nav-mobile{display:none;border-top:1px solid var(--color-line);background:#fff}
.nav-mobile.open{display:block}
.nav-mobile ul{display:flex;flex-direction:column}
.nav-mobile li{border-bottom:1px solid var(--color-line)}
.nav-mobile a{display:block;padding:18px var(--pad-x);font-size:15px}
@media(min-width:900px){.nav-mobile{display:none!important}}

/* ---------- buttons ---------- */
.btn{display:inline-flex;align-items:center;gap:10px;padding:16px 32px;border:1px solid var(--color-ink);background:var(--color-ink);color:#fff;font-size:15px;font-weight:500;border-radius:var(--radius);transition:background .15s,color .15s,transform .15s}
.btn:hover{background:#000;transform:translateY(-1px)}
.btn--ghost{background:transparent;color:var(--color-ink)}
.btn--ghost:hover{background:var(--color-ink);color:#fff;transform:translateY(-1px)}
.btn--large{padding:20px 44px;font-size:16px}
.btn__arrow{transition:transform .2s}
.btn:hover .btn__arrow{transform:translateX(3px)}

/* ---------- generic cards / lists ---------- */
.card{border:1px solid var(--color-line);padding:clamp(28px,3vw,40px);border-radius:var(--radius);background:#fff}
.grid{display:grid;gap:clamp(20px,2.4vw,32px)}
.grid--2{grid-template-columns:1fr}
.grid--3{grid-template-columns:1fr}
.grid--4{grid-template-columns:1fr}
@media(min-width:720px){
  .grid--2{grid-template-columns:repeat(2,1fr)}
  .grid--3{grid-template-columns:repeat(3,1fr)}
  .grid--4{grid-template-columns:repeat(2,1fr)}
}
@media(min-width:1000px){.grid--4{grid-template-columns:repeat(4,1fr)}}

/* ---------- tables ---------- */
.spec-table{width:100%;border-top:1px solid var(--color-line)}
.spec-table th,.spec-table td{text-align:left;padding:18px 12px;border-bottom:1px solid var(--color-line);vertical-align:top;font-weight:400}
.spec-table th{width:34%;color:var(--color-sub);font-weight:500}
@media(max-width:640px){
  .spec-table th,.spec-table td{display:block;padding:8px 0;border:0}
  .spec-table tr{display:block;border-bottom:1px solid var(--color-line);padding-block:16px}
  .spec-table th{width:auto;font-size:13px;color:var(--color-mute)}
}

/* ---------- footer ---------- */
.site-footer{border-top:1px solid var(--color-line);padding-block:64px 32px;background:#fff;margin-top:120px}
.site-footer__grid{display:grid;gap:40px;grid-template-columns:1fr}
@media(min-width:800px){.site-footer__grid{grid-template-columns:1.4fr 1fr 1fr}}
.site-footer h4{font-size:12px;letter-spacing:.2em;color:var(--color-mute);margin-bottom:16px;text-transform:uppercase;font-family:var(--font-en)}
.site-footer ul li{margin-bottom:10px}
.site-footer a{color:var(--color-sub);font-size:14px;transition:color .15s}
.site-footer a:hover{color:var(--color-ink)}
.site-footer__info p{font-size:14px;color:var(--color-sub);margin-bottom:8px}
.site-footer__brand{display:flex;align-items:center;gap:12px;margin-bottom:24px}
.site-footer__brand img{height:40px;width:40px;flex-shrink:0}
.site-footer__brand-text{display:flex;flex-direction:column;line-height:1.15}
.site-footer__brand-text small{font-size:10px;letter-spacing:.2em;color:var(--color-sub);margin-bottom:2px}
.site-footer__brand-text strong{font-size:18px;font-weight:700;letter-spacing:.14em;color:var(--color-ink)}
.site-footer__bottom{border-top:1px solid var(--color-line);margin-top:48px;padding-top:24px;display:flex;flex-wrap:wrap;gap:16px;justify-content:space-between;align-items:center}
.site-footer__bottom p{font-size:12px;color:var(--color-mute)}
.translate-btn{font-size:12px;color:var(--color-sub);border:1px solid var(--color-line);padding:6px 14px;border-radius:var(--radius);background:#fff;cursor:pointer}
.translate-btn:hover{border-color:var(--color-ink)}
#google_translate_element{display:inline-block}

/* ---------- share ---------- */
.share{display:flex;gap:10px;align-items:center;justify-content:center;padding:48px 0;border-top:1px solid var(--color-line);max-width:var(--max);margin-inline:auto}
.share span{font-size:12px;color:var(--color-mute);letter-spacing:.1em;margin-right:8px}
.share a{width:40px;height:40px;display:flex;align-items:center;justify-content:center;border:1px solid var(--color-line);border-radius:999px;color:var(--color-sub);transition:border-color .15s,color .15s,background .15s}
.share a:hover{border-color:var(--color-ink);color:#fff;background:var(--color-ink)}
.share a svg{width:16px;height:16px}

/* ---------- utilities ---------- */
.flow > * + *{margin-top:1em}
.divider{height:1px;background:var(--color-line);border:0;margin-block:48px}
.tag{display:inline-block;font-size:12px;letter-spacing:.1em;color:var(--color-sub);border:1px solid var(--color-line);padding:4px 10px;border-radius:999px}
.visually-hidden{position:absolute;clip:rect(0 0 0 0);width:1px;height:1px;overflow:hidden;white-space:nowrap}

/* ---------- print ---------- */
@media print{
  .site-header,.site-footer,.share,.cta{display:none}
  .section{padding-block:24px}
  body{font-size:12pt;color:#000}
}