:root{
  --bg:#0a0a0a; --bg2:#131316; --panel:#17171b; --line:#2a2a30;
  --text:#eceef0; --muted:#9ba0a6; --silver:#c9ccd1; --silver-dark:#969ca5;
  --silver-grad:linear-gradient(180deg,#f4f5f7 0%,#d8dbdf 38%,#9aa0a8 55%,#e7e9ec 100%);
  --silver-grad-hover:linear-gradient(180deg,#e3e5e8 0%,#c4c8ce 45%,#878e97 60%,#d3d6db 100%);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--text);
  font-family:"Hiragino Kaku Gothic ProN","Hiragino Sans","Noto Sans JP",sans-serif;
  line-height:1.7;-webkit-text-size-adjust:100%}
h1,h2,h3,.logo{font-family:"Hiragino Mincho ProN","Yu Mincho",serif;font-weight:600;letter-spacing:.04em}
a{color:var(--silver)}
img{max-width:100%;display:block}
main{max-width:1080px;margin:0 auto;padding:0 16px 64px}
.site-header{position:sticky;top:0;background:rgba(10,10,10,.94);border-bottom:1px solid var(--line);z-index:10;backdrop-filter:blur(6px)}
.header-inner{max-width:1080px;margin:0 auto;padding:12px 16px;display:flex;align-items:center;gap:16px;flex-wrap:wrap}
.logo{color:transparent;text-decoration:none;font-size:26px;letter-spacing:.28em;
  background:var(--silver-grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.logo-sub{display:block;font-size:9px;letter-spacing:.34em;color:var(--silver);font-family:sans-serif}
.main-nav{display:flex;gap:14px;flex-wrap:wrap;margin-left:auto}
.main-nav a{color:var(--muted);text-decoration:none;font-size:13px}
.main-nav a:hover{color:var(--silver)}
.cart-link{color:var(--text);text-decoration:none;font-size:13px;border:1px solid var(--line);padding:6px 12px;border-radius:999px}
.cart-count{background:var(--silver-grad);color:#111;border-radius:999px;padding:0 7px;font-weight:700;margin-left:4px}
.hero{text-align:center;padding:72px 12px 56px;border-bottom:1px solid var(--line)}
.hero-eyebrow{color:var(--silver);letter-spacing:.4em;font-size:12px;margin:0 0 14px}
.hero h1{font-size:clamp(30px,7vw,52px);line-height:1.5;margin:0 0 18px;
  background:var(--silver-grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;color:transparent}
.hero-text{color:var(--muted);margin:0 0 28px}
.btn{display:inline-block;background:transparent;color:var(--text);border:1px solid var(--line);
  padding:12px 26px;border-radius:4px;text-decoration:none;font-size:15px;cursor:pointer}
.btn-silver{background:var(--silver-grad);border-color:#c9ccd1;color:#14161a;font-weight:700}
.btn-silver:hover{background:var(--silver-grad-hover)}
.btn-wide{width:100%;text-align:center}
section{padding:44px 0 8px}
h2{font-size:24px;border-left:3px solid var(--silver);padding-left:12px}
.concept-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:16px}
.concept-grid div{background:var(--panel);border:1px solid var(--line);padding:20px;border-radius:6px}
.concept-grid h3{margin-top:0;color:var(--silver)}
.cat-list{display:flex;gap:12px;list-style:none;padding:0;flex-wrap:wrap}
.cat-list a{display:block;border:1px solid var(--line);padding:12px 22px;border-radius:999px;color:var(--text);text-decoration:none;background:var(--bg2)}
.section-note,.img-note,.checkout-note{color:var(--muted);font-size:13px}
.product-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:18px}
@media(min-width:720px){.product-grid{grid-template-columns:repeat(auto-fill,minmax(220px,1fr))}}
.product-card{background:var(--panel);border:1px solid var(--line);border-radius:6px;overflow:hidden}
.product-card a{color:var(--text);text-decoration:none;display:block;padding-bottom:14px}
.product-card h3{font-size:16px;margin:10px 14px 4px;font-family:sans-serif;letter-spacing:0}
.card-cat{color:var(--silver);font-size:11px;letter-spacing:.2em;margin:12px 14px 0}
.card-price{margin:2px 14px 0;font-size:17px}
.tax-note{color:var(--muted);font-size:11px;margin-left:6px}
.notice-box{background:var(--bg2);border:1px solid var(--line);border-radius:6px;padding:8px 22px 18px;margin-top:44px}
.page-body{max-width:760px}
.page-body h1{font-size:30px;border-bottom:1px solid var(--line);padding-bottom:12px}
.breadcrumb{color:var(--muted);font-size:13px}
.breadcrumb a{color:var(--muted)}
.detail-grid{display:grid;grid-template-columns:1fr;gap:24px}
@media(min-width:760px){.detail-grid{grid-template-columns:1fr 1fr}}
.detail-image img{border:1px solid var(--line);border-radius:6px}
.tagline{font-family:"Hiragino Mincho ProN",serif;font-size:19px;color:var(--silver)}
.detail-price{font-size:26px}
.detail-meta{display:grid;grid-template-columns:90px 1fr;gap:6px 14px;border-top:1px solid var(--line);padding-top:16px;margin-top:20px;font-size:14px}
.detail-meta dt{color:var(--muted)}
.detail-meta dd{margin:0}
.cart-msg{color:var(--silver);min-height:1.4em;font-size:14px}
.cart-table{width:100%;border-collapse:collapse;margin:18px 0}
.cart-table th,.cart-table td{border-bottom:1px solid var(--line);padding:10px 6px;text-align:left;font-size:14px;vertical-align:middle}
.cart-table input{width:56px;background:var(--bg2);color:var(--text);border:1px solid var(--line);border-radius:4px;padding:6px}
.cart-total{font-size:18px;text-align:right}
.checkout-area{margin-top:20px}
.modal{position:fixed;inset:0;background:rgba(0,0,0,.75);display:flex;align-items:center;justify-content:center;padding:16px;z-index:50}
.modal[hidden]{display:none}
.modal-box{background:var(--panel);border:1px solid var(--silver);border-radius:8px;max-width:440px;padding:26px}
.contact-form{display:grid;gap:16px;max-width:520px}
.contact-form label{display:grid;gap:6px;font-size:14px}
.contact-form input,.contact-form textarea{background:var(--bg2);color:var(--text);border:1px solid var(--line);border-radius:4px;padding:10px;font:inherit}
.site-footer{border-top:1px solid var(--line);background:var(--bg2);margin-top:40px}
.footer-inner{max-width:1080px;margin:0 auto;padding:32px 16px;text-align:center}
.footer-logo{font-family:"Hiragino Mincho ProN",serif;font-size:22px;letter-spacing:.3em;margin:0 0 10px;
  background:var(--silver-grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;color:transparent}
.footer-nav{display:flex;gap:16px;justify-content:center;flex-wrap:wrap;margin-bottom:14px}
.footer-nav a{color:var(--muted);text-decoration:none;font-size:13px}
.seller{color:var(--text);font-size:14px}
.seller-note{color:var(--muted);font-size:12px}
.en-note{color:var(--muted);font-size:.92em}
.feature{background:var(--bg2);border:1px solid var(--silver-dark);border-radius:6px;padding:28px 22px 12px;margin-top:44px}
.feature h2{border-left-color:var(--silver)}
.badge{display:inline-block;background:var(--silver-grad);color:#14161a;font-weight:700;font-size:11px;letter-spacing:.06em;border-radius:999px;padding:2px 10px;line-height:1.5}
.card-badge{margin:10px 14px 0;display:flex;gap:6px;flex-wrap:wrap}
.status-box{background:var(--bg2);border:1px solid var(--silver-dark);border-radius:6px;padding:12px 16px;font-size:14px;margin:0 0 20px}
.detail-image img+img{margin-top:14px}