:root{
  --black:#191919;
  --black-solid:#141414;
  --white:#ffffff;
  --ink:#1a1a1a;
  --gray:#6b6b6b;
  --line:#e4e4e4;
  --line-dark:#333333;
  --font-jp:"Zen Kaku Gothic New",sans-serif;
  --font-serif:"Zen Kaku Gothic New",sans-serif;
  --font-en:"Inter","Zen Kaku Gothic New",sans-serif;
  --maxw:1180px;
  --pad:clamp(24px,5vw,80px);
  /* SVG feTurbulence によるグレイン。元画像並みのはっきりした粒状感 */
  --grain:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.6' numOctaves='3' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.16'/%3E%3C/svg%3E");
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:var(--font-jp);
  font-weight:400;
  color:var(--ink);
  background:var(--white);
  font-size:16px;
  line-height:2;
  -webkit-font-smoothing:antialiased;
  letter-spacing:.01em;
}
.wrap{max-width:var(--maxw);margin:0 auto;padding-left:var(--pad);padding-right:var(--pad)}

/* header */
.site-header{position:fixed;top:0;left:0;right:0;z-index:50;mix-blend-mode:difference}
.site-header .wrap{display:flex;align-items:center;justify-content:space-between;height:72px}
.brand{font-weight:700;font-size:17px;color:#fff;letter-spacing:.08em;text-decoration:none}
.site-nav{display:flex;gap:32px}
.site-nav a{font-family:var(--font-en);font-size:12px;letter-spacing:.06em;color:#fff;text-decoration:none;opacity:.85;transition:opacity .2s}
.site-nav a:hover{opacity:1}
.nav-drop{position:relative;display:flex;align-items:center}
.nav-drop-trigger{display:inline-flex;align-items:center;gap:5px}
.nav-drop-trigger::after{content:"";width:5px;height:5px;border-right:1.2px solid #fff;border-bottom:1.2px solid #fff;transform:rotate(45deg) translateY(-1px);transition:transform .2s}
.nav-drop:hover .nav-drop-trigger::after{transform:rotate(225deg) translateY(-1px)}
.nav-drop-menu{position:absolute;top:100%;left:50%;transform:translateX(-50%) translateY(8px);background:#111;border:1px solid #2a2a2a;min-width:240px;padding:8px 0;opacity:0;visibility:hidden;transition:opacity .2s,transform .2s;mix-blend-mode:normal;isolation:isolate;box-shadow:0 12px 40px rgba(0,0,0,.5)}
.nav-drop:hover .nav-drop-menu{opacity:1;visibility:visible;transform:translateX(-50%) translateY(0)}
.nav-drop-menu a{display:block;font-family:var(--font-jp);font-size:13px;letter-spacing:.02em;color:#cfcfcf;padding:11px 22px;opacity:1;white-space:nowrap;line-height:1.4}
.nav-drop-menu a:hover{background:#1d1d1d;color:#fff;opacity:1}
/* hamburger button（モバイルのみ表示） */
.nav-toggle{display:none;width:40px;height:40px;background:transparent;border:0;padding:0;cursor:pointer;position:relative;z-index:50;-webkit-tap-highlight-color:transparent}
.nav-toggle span{display:block;position:absolute;left:8px;right:8px;height:1.4px;background:#fff;transition:transform .3s cubic-bezier(.2,.7,.2,1),top .3s cubic-bezier(.2,.7,.2,1)}
.nav-toggle span:nth-child(1){top:15px}
.nav-toggle span:nth-child(2){top:23px}
.nav-toggle[aria-expanded="true"] span:nth-child(1){top:19px;transform:rotate(45deg)}
.nav-toggle[aria-expanded="true"] span:nth-child(2){top:19px;transform:rotate(-45deg)}

@media(max-width:680px){
  .nav-toggle{display:block}
  /* モバイル：フルスクリーン暗転メニュー */
  .site-nav{
    position:fixed;top:0;left:0;right:0;bottom:0;
    background-color:#0a0a0a;background-image:var(--grain);
    flex-direction:column;align-items:stretch;justify-content:flex-start;
    gap:0;padding:96px var(--pad) 60px;
    mix-blend-mode:normal;isolation:isolate;
    opacity:0;visibility:hidden;transform:translateY(-6px);
    transition:opacity .3s cubic-bezier(.2,.7,.2,1),transform .3s cubic-bezier(.2,.7,.2,1),visibility .3s;
    overflow-y:auto;-webkit-overflow-scrolling:touch;
    z-index:40;
  }
  .site-nav.is-open{opacity:1;visibility:visible;transform:none}
  .site-nav > a,.site-nav .nav-drop{width:100%;border-bottom:1px solid #1f1f1f}
  .site-nav > a{font-family:var(--font-jp);font-size:18px;letter-spacing:.04em;padding:22px 2px;opacity:1;color:#fff}
  .site-nav > a:hover{opacity:1}

  /* ドロップダウンはアコーディオン化 */
  .nav-drop{display:block;position:static}
  .site-nav .nav-drop-trigger{
    font-family:var(--font-jp);font-size:18px;letter-spacing:.04em;
    padding:22px 2px;width:100%;justify-content:space-between;
    cursor:pointer;opacity:1;color:#fff;
  }
  .site-nav .nav-drop-trigger::after{width:7px;height:7px;border-width:1.2px;transform:rotate(45deg) translate(-2px,-2px);transition:transform .3s cubic-bezier(.2,.7,.2,1)}
  .nav-drop.is-open .nav-drop-trigger::after{transform:rotate(225deg) translate(-2px,-2px)}
  .site-nav .nav-drop-menu{
    position:static;transform:none;left:auto;top:auto;
    background:transparent;border:0;box-shadow:none;min-width:0;
    opacity:1;visibility:visible;
    max-height:0;overflow:hidden;padding:0;
    transition:max-height .35s cubic-bezier(.2,.7,.2,1),padding .25s;
    mix-blend-mode:normal;
  }
  .site-nav .nav-drop.is-open .nav-drop-menu{max-height:400px;padding:0 0 18px;transform:none}
  .site-nav .nav-drop-menu a{font-size:14px;padding:11px 0 11px 18px;color:#9a9a9a;white-space:normal;line-height:1.6}
  .site-nav .nav-drop-menu a:hover{background:transparent;color:#fff}

  /* メニュー開いている間：bodyスクロールロック・ヘッダーのblend modeを切る */
  body.nav-open{overflow:hidden}
  body.nav-open .site-header{mix-blend-mode:normal}
}

/* section base */
.section{padding:clamp(90px,13vw,180px) 0}
.eyebrow{font-family:var(--font-en);font-size:12px;letter-spacing:.14em;color:var(--gray);margin-bottom:28px;display:block}
.lead{font-weight:500;font-size:clamp(26px,4vw,44px);line-height:1.5;letter-spacing:.02em}
.dark .eyebrow{color:#8a8a8a}

/* hero */
.hero{background-color:var(--black);background-image:var(--grain);color:#fff;min-height:100vh;display:flex;align-items:center;position:relative;overflow:hidden}
.hero .wrap{width:100%;position:relative;z-index:2}
.hero .eyebrow{color:#8a8a8a;margin-bottom:28px}
.hero h1{font-weight:700;font-size:clamp(34px,6.5vw,72px);line-height:1.25;letter-spacing:.04em}
.hero .sub{font-weight:400;font-size:clamp(15px,1.7vw,18px);line-height:1.8;letter-spacing:.02em;color:#bdbdbd;margin-top:30px}
.kv{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:var(--maxw);max-width:calc(100% - var(--pad)*2);height:0;z-index:1;pointer-events:none}
.kv svg{position:absolute;right:0;top:50%;transform:translateY(-50%);width:min(40vw,440px);height:min(40vw,440px)}
@media(max-width:760px){.kv svg{opacity:.4;right:-8%;width:64vw;height:64vw}}

/* arrow link */
.arrow-link{display:inline-flex;align-items:center;gap:10px;font-size:14px;letter-spacing:.04em;color:inherit;text-decoration:none;margin-top:48px;border-bottom:1px solid currentColor;padding-bottom:4px;transition:gap .25s}
.arrow-link:hover{gap:16px}
.arrow-link .ar{font-family:var(--font-en)}

/* about */
.about{background:#fff}
.about .body{margin-top:8px;font-weight:400;font-size:clamp(15px,1.6vw,17px);line-height:2;color:#333}

/* business dark */
.business{background-color:var(--black);background-image:var(--grain);color:#fff}
.business .head{max-width:760px;margin-bottom:80px}
.business .desc{font-weight:400;color:#bdbdbd;font-size:15px;line-height:1.9;margin-top:28px;max-width:580px}
.biz-grid{display:grid;grid-template-columns:repeat(2,1fr);grid-auto-rows:1fr;gap:1px;background:var(--line-dark);border:1px solid var(--line-dark)}
@media(max-width:680px){.biz-grid{grid-template-columns:1fr}}
.biz-card{background:var(--black);padding:44px 40px;text-decoration:none;color:#fff;display:flex;flex-direction:column;justify-content:flex-start;transition:background .3s}
a.biz-card:hover{background:#222}
a.biz-card{cursor:pointer}
.biz-card .tag{font-family:var(--font-en);font-size:12px;letter-spacing:.1em;color:#7a7a7a;margin-bottom:auto}
.biz-card h3{font-weight:500;font-size:21px;letter-spacing:.02em;line-height:1.5}
.biz-card p{font-weight:400;font-size:14px;line-height:1.8;color:#9a9a9a;margin-top:16px}
.biz-card .go{font-family:var(--font-en);font-size:12px;color:#666;margin-top:20px;letter-spacing:.06em}

/* company */
.company{background:#fff}
.spec{margin-top:8px;border-top:1px solid var(--line)}
.spec dl{display:grid;grid-template-columns:200px 1fr;border-bottom:1px solid var(--line)}
@media(max-width:680px){.spec dl{grid-template-columns:1fr}}
.spec dt{padding:22px 0;font-size:13px;letter-spacing:.08em;color:var(--gray);font-weight:500}
.spec dd{padding:22px 0;font-size:15px;font-weight:400;color:#222;line-height:1.8}
@media(max-width:680px){.spec dt{padding-bottom:4px}.spec dd{padding-top:4px}}
.biz-list{list-style:none;margin:0;padding:0}
.biz-list li{position:relative;padding-left:20px;font-size:14px;font-weight:400;color:#333;padding-top:3px;padding-bottom:3px;line-height:1.7}
.biz-list li::before{content:"";position:absolute;left:4px;top:14px;width:4px;height:4px;background:var(--gray);border-radius:50%}

/* contact dark */
.contact{background-color:var(--black);background-image:var(--grain);color:#fff;text-align:left}
.contact .lead{margin-bottom:28px}
.contact-text{font-weight:400;color:#cfcfcf;font-size:clamp(15px,1.7vw,17px);line-height:2;margin-bottom:40px}
.contact-btn{display:inline-flex;align-items:center;gap:12px;background:#fff;color:#111;font-size:16px;font-weight:500;padding:18px 36px;text-decoration:none;letter-spacing:.04em;transition:opacity .25s}
.contact-btn:hover{opacity:.82}
.contact-btn .ar{font-family:var(--font-en)}
.contact .note{font-weight:400;color:#8a8a8a;font-size:14px;line-height:1.9;margin-top:36px}
.contact .note a{color:#bdbdbd}

/* footer */
.site-footer{background:#050505;color:#fff;padding:64px 0 40px}
.site-footer .row{display:flex;justify-content:space-between;align-items:flex-end;flex-wrap:wrap;gap:24px}
.site-footer .fbrand{font-weight:700;font-size:17px;letter-spacing:.08em}
.site-footer .addr{font-weight:300;font-size:12.5px;color:#7a7a7a;margin-top:12px;line-height:1.8}
.site-footer .copy{font-family:var(--font-en);font-size:11px;color:#555;letter-spacing:.06em}

/* reveal */
.reveal{opacity:0;transform:translateY(24px);transition:opacity .9s cubic-bezier(.2,.7,.2,1),transform .9s cubic-bezier(.2,.7,.2,1)}
.reveal.in{opacity:1;transform:none}

/* ============ page-hero（製品/contact/privacy 共通） ============ */
.page-hero{background-color:var(--black);background-image:var(--grain);color:#fff;padding:clamp(80px,12vw,130px) 0 clamp(56px,8vw,80px)}
.page-hero .eyebrow{font-family:var(--font-en);font-size:12px;letter-spacing:.14em;color:#8a8a8a;font-weight:600;display:block;margin-bottom:22px}
.page-hero h1{font-weight:500;font-size:clamp(28px,4.6vw,46px);letter-spacing:.02em;line-height:1.3}
.page-hero .sub{font-weight:400;font-size:clamp(15px,1.7vw,17px);color:#bdbdbd;margin-top:22px;line-height:1.9}
.page-hero .crumb{font-family:var(--font-en);font-size:12px;letter-spacing:.08em;color:#8a8a8a;margin-bottom:24px}
.page-hero .crumb a{color:#8a8a8a;text-decoration:none}
.page-hero .crumb a:hover{color:#fff}

/* ============ psec（製品/contact/privacy 共通の白セクション） ============ */
.psec{padding:clamp(52px,8vw,90px) 0;border-bottom:1px solid var(--line)}
.psec:last-of-type{border-bottom:none}
.psec h2{font-weight:500;font-size:clamp(20px,2.8vw,28px);letter-spacing:.02em;margin-bottom:32px;line-height:1.4}

/* ============ contact フォーム ============ */
/* 件名フィールド（?src= 経由でセットされた「お問い合わせ元」を readonly で表示） */
.field.field-subject input[readonly]{background-color:#ececec;border:1px solid #dcdcdc;padding:12px 14px;color:#555;font-weight:500;cursor:not-allowed}
.field.field-subject input[readonly]:focus{border-color:#dcdcdc;outline:none}
.field.field-subject input[readonly]::selection{background:#d4d4d4;color:#111}
.form-intro{font-size:15px;line-height:2;color:#333;margin-bottom:14px}
.req-note{color:#888;font-size:13px;margin-bottom:36px}
.field{margin-bottom:32px}
.lbl{display:block;font-weight:500;font-size:14px;letter-spacing:.04em;margin-bottom:12px;color:#222}
.must{color:#c0392b;font-size:12px;margin-left:6px;font-weight:500}
.field input[type="text"],.field input[type="email"],.field input[type="tel"],.field textarea{width:100%;font-family:var(--font-jp);font-size:15px;color:#1a1a1a;background:transparent;border:none;border-bottom:1px solid #d4d4d4;padding:10px 2px;outline:none;transition:border-color .2s;line-height:1.6}
.field textarea{min-height:140px;border:1px solid #d4d4d4;padding:14px 16px;resize:vertical}
.field input:focus,.field textarea:focus{border-color:#111}
.field .error{color:#c0392b;font-size:13px;margin-top:8px}
.global-error{background:#fdf2ef;border:1px solid #efc8be;color:#a8351c;padding:18px 22px;margin-bottom:32px;font-size:14px;line-height:1.8}
.global-error ul{margin:8px 0 0 22px}
.consent{display:flex;align-items:center;gap:12px;margin:28px 0 40px;font-size:14px;color:#333}
.consent input[type="checkbox"]{width:16px;height:16px;accent-color:#111}
.consent a{color:#111;text-decoration:underline;text-underline-offset:3px}
.actions{margin-top:48px;display:flex;flex-wrap:wrap;gap:16px;align-items:center}
.actions form.inline{display:inline-block}
.btn{font-family:var(--font-jp);font-size:14px;letter-spacing:.04em;padding:16px 32px;cursor:pointer;background:#fff;color:#111;border:1px solid #d4d4d4;text-decoration:none;display:inline-flex;align-items:center;gap:10px;transition:background .2s,border-color .2s}
.btn:hover{background:#f6f6f6}
.btn-primary{background:#111;color:#fff;border-color:#111}
.btn-primary:hover{background:#222}
.btn-back{}
.actions .ar{font-family:var(--font-en);font-size:13px}

/* ============ confirm 確認画面 ============ */
.confirm-list{border-top:1px solid var(--line);margin-top:8px}
.confirm-list dl{display:grid;grid-template-columns:200px 1fr;border-bottom:1px solid var(--line);padding:22px 0}
.confirm-list dt{font-size:14px;color:#888;font-weight:500}
.confirm-list dd{font-size:15px;color:#1a1a1a;line-height:1.8}
@media(max-width:680px){.confirm-list dl{grid-template-columns:1fr;gap:4px}}

/* ============ finish 完了画面 ============ */
.finish-msg{font-size:16px;line-height:2;color:#333}
.finish-msg p{margin-bottom:18px}
.back-top{display:inline-block;margin-top:48px;font-size:14px;color:#666;text-decoration:none}
.back-top:hover{color:#111}

/* ============ プライバシー本文 ============ */
.prose{max-width:880px}
.prose h2{font-weight:500;font-size:17px;letter-spacing:.02em;margin:48px 0 16px;padding-left:14px;border-left:3px solid #1a1a1a;line-height:1.5}
.prose h2:first-child{margin-top:0}
.prose p{font-size:15px;line-height:2;color:#333;margin-bottom:16px}
.prose .contact-box{background:#f6f6f6;border:1px solid var(--line);padding:24px 28px;margin-top:20px}
.prose .contact-box p{margin-bottom:6px;font-size:14.5px}



/* footer legal links */
.site-footer .row{align-items:flex-start}
.site-footer .flinks{display:flex;flex-direction:column;gap:8px}
.site-footer .flinks a{font-size:12.5px;color:#9a9a9a;text-decoration:none;letter-spacing:.02em}
.site-footer .flinks a:hover{color:#fff}
@media(max-width:680px){
  .site-footer .row{flex-direction:column;gap:32px;align-items:flex-start}
}