/* ── Reset & Variables ── */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --navy:#1F3A5F;--gold:#B8923B;--bg:#FBF9F5;
  --text:#1A1A1A;--sub:#5A5A5A;--border:#E5E5E5;
  --serif:'Noto Serif JP',serif;
  --sans:'Noto Sans JP',sans-serif;
  --cor:'Cormorant Garamond',serif;
}
html{scroll-behavior:smooth}
body{background:var(--bg);color:var(--text);font-family:var(--sans);font-size:16px;line-height:1.8;overflow-x:hidden}
a{text-decoration:none;color:inherit}
img{display:block;width:100%}

/* ── Fade ── */
.fade{opacity:0;transform:translateY(20px);transition:opacity .7s ease,transform .7s ease}
.fade.in{opacity:1;transform:none}
.fd1{transition-delay:.1s}.fd2{transition-delay:.2s}.fd3{transition-delay:.3s}.fd4{transition-delay:.45s}

/* ══════════════════════
   HEADER
══════════════════════ */
header{
  position:fixed;top:0;left:0;right:0;z-index:200;
  display:flex;align-items:center;justify-content:space-between;
  padding:0 48px;height:84px;
  background:rgba(251,249,245,.94);backdrop-filter:blur(12px);
  border-bottom:1px solid var(--border);
}
.logo{font-family:var(--cor);font-size:19px;letter-spacing:.18em;color:var(--navy);text-transform:uppercase;line-height:1.2;display:flex;align-items:center;gap:14px}
.logo-mark{height:56px;width:auto;display:block;flex-shrink:0}
.logo-text{display:flex;flex-direction:column;line-height:1.2}
.logo small{display:block;font-family:var(--sans);font-size:11px;letter-spacing:.12em;color:var(--sub);font-weight:300;margin-top:4px;text-transform:none}
nav{display:flex;align-items:center;gap:28px}
.nav-a{
  font-family:var(--sans);font-size:13px;color:var(--sub);
  cursor:pointer;transition:color .2s;position:relative;
  background:none;border:none;padding:0;
}
.nav-a::after{content:'';position:absolute;bottom:-3px;left:0;right:0;height:1px;background:var(--gold);transform:scaleX(0);transition:transform .2s}
.nav-a:hover,.nav-a.active{color:var(--navy)}
.nav-a:hover::after,.nav-a.active::after{transform:scaleX(1)}
.lang-btn{display:flex;border:1px solid var(--border);border-radius:4px;overflow:hidden;margin-left:4px}
.lang-btn button{font-family:var(--cor);font-size:11px;letter-spacing:.1em;padding:4px 10px;background:none;border:none;cursor:pointer;color:var(--sub);transition:all .2s}
.lang-btn button.active{background:var(--navy);color:#fff}
.header-sns{display:flex;align-items:center;gap:8px;margin-left:6px}
.sns-icon{width:34px;height:34px;border-radius:50%;display:flex;align-items:center;justify-content:center;border:1px solid var(--border);color:var(--sub);transition:all .2s;cursor:pointer;flex-shrink:0}
.sns-icon:hover{border-color:var(--navy);color:var(--navy)}
.sns-icon.line{background:#06C755;border-color:#06C755;color:#fff}
.sns-icon.line:hover{background:#05a848;border-color:#05a848}
.sns-icon svg{width:16px;height:16px;fill:currentColor}

/* ══════════════════════
   SECTION COMMON
══════════════════════ */
.section{padding:100px 48px;max-width:1200px;margin:0 auto}
.sec-en{font-family:var(--cor);font-size:11px;letter-spacing:.22em;color:var(--gold);text-transform:uppercase;margin-bottom:10px}
.sec-ja{font-family:var(--serif);font-size:28px;font-weight:700;color:var(--navy);line-height:1.4}
.sec-head-row{display:flex;align-items:flex-end;justify-content:space-between;margin-bottom:56px}
.see-all{font-family:var(--cor);font-size:12px;letter-spacing:.14em;color:var(--sub);text-transform:uppercase;display:inline-flex;align-items:center;gap:10px;transition:color .2s}
.see-all::after{content:'';display:block;width:28px;height:1px;background:currentColor;transition:width .2s}
.see-all:hover{color:var(--navy)}.see-all:hover::after{width:44px}

/* Page hero (inner pages) */
.page-hero{
  padding-top:64px;background:var(--navy);
  display:flex;flex-direction:column;justify-content:flex-end;
  padding-bottom:64px;padding-left:48px;padding-right:48px;
  min-height:280px;position:relative;overflow:hidden;
}
.page-hero::before{
  content:'';position:absolute;inset:0;
  background:linear-gradient(135deg,rgba(10,20,36,.9) 0%,rgba(31,58,95,.6) 100%);
}
.page-hero-bg-text{
  position:absolute;right:48px;bottom:-20px;
  font-family:var(--cor);font-size:160px;font-weight:300;
  color:rgba(255,255,255,.04);letter-spacing:.06em;pointer-events:none;line-height:1;
}
.page-hero-en{font-family:var(--cor);font-size:11px;letter-spacing:.22em;color:var(--gold);text-transform:uppercase;margin-bottom:12px;position:relative}
.page-hero-ja{font-family:var(--serif);font-size:38px;font-weight:700;color:#fff;line-height:1.4;position:relative}

/* Breadcrumb */
.breadcrumb{
  display:flex;align-items:center;gap:10px;
  font-family:var(--cor);font-size:11px;letter-spacing:.1em;color:rgba(255,255,255,.4);
  position:relative;margin-bottom:24px;text-transform:uppercase;
}
.breadcrumb a{color:rgba(255,255,255,.4);transition:color .2s}
.breadcrumb a:hover{color:var(--gold)}
.breadcrumb span{color:rgba(255,255,255,.25)}

/* ══════════════════════
   NEWS BAR
══════════════════════ */
.news-bar{display:flex;align-items:stretch;height:44px;border-bottom:1px solid var(--border);overflow:hidden}
.news-label{flex-shrink:0;padding:0 24px;background:var(--navy);display:flex;align-items:center;font-family:var(--cor);font-size:11px;letter-spacing:.2em;color:#fff;text-transform:uppercase}
.news-track{flex:1;overflow:hidden;display:flex;align-items:center}
.news-inner{display:flex;gap:60px;animation:ticker 28s linear infinite;white-space:nowrap}
@keyframes ticker{0%{transform:translateX(0)}100%{transform:translateX(-50%)}}
.news-item{display:inline-flex;align-items:center;gap:16px;font-size:12px;color:var(--sub)}
.news-item .nd{font-family:var(--cor);font-size:11px;color:var(--gold);letter-spacing:.06em}

/* ══════════════════════
   WORKS GRID
══════════════════════ */
.works-tabs{display:flex;gap:0;margin-bottom:40px;border:1px solid var(--border);border-radius:4px;overflow:hidden;width:fit-content}
.works-tab{font-family:var(--sans);font-size:13px;padding:10px 24px;background:none;border:none;cursor:pointer;color:var(--sub);transition:all .2s;border-right:1px solid var(--border)}
.works-tab:last-child{border-right:none}
.works-tab.active{background:var(--navy);color:#fff}
.works-tab:hover:not(.active){background:#f0ede8}
.works-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:2px}
.work-card{position:relative;overflow:hidden;background:#c8c4bc;aspect-ratio:3/4;cursor:pointer;display:block}
.work-card .wthumb{width:100%;height:100%;transition:transform .6s ease;object-fit:cover}
.work-card:hover .wthumb{transform:scale(1.05)}
.work-card .wcap{position:absolute;bottom:0;left:0;right:0;padding:48px 20px 20px;background:linear-gradient(to top,rgba(10,20,36,.82) 0%,transparent 100%);color:#fff}
.wcap-en{font-family:var(--cor);font-size:10px;letter-spacing:.18em;color:rgba(184,146,59,.9);text-transform:uppercase;margin-bottom:4px}
.wcap-ja{font-family:var(--serif);font-size:15px;font-weight:700;line-height:1.5}
.wcap-tag{position:absolute;top:16px;left:16px;font-family:var(--sans);font-size:10px;letter-spacing:.06em;padding:3px 10px;background:rgba(31,58,95,.75);color:rgba(255,255,255,.9);border-radius:2px;backdrop-filter:blur(4px)}

/* ══════════════════════
   CONCEPT BAND
══════════════════════ */
.concept-band{background:var(--navy);padding:100px 48px;display:flex;flex-direction:column;align-items:center;text-align:center;position:relative;overflow:hidden}
.concept-bg{position:absolute;inset:0;font-family:var(--cor);font-size:240px;font-weight:300;color:rgba(255,255,255,.025);display:flex;align-items:center;justify-content:center;letter-spacing:.06em;pointer-events:none;white-space:nowrap;overflow:hidden}
.concept-en{font-family:var(--cor);font-size:11px;letter-spacing:.22em;color:var(--gold);text-transform:uppercase;margin-bottom:36px;position:relative}
.concept-h{font-family:var(--serif);font-size:32px;font-weight:700;line-height:1.75;color:#fff;margin-bottom:36px;position:relative;letter-spacing:.04em}
.concept-h em{font-style:normal;color:var(--gold)}
.concept-divider{width:40px;height:1px;background:var(--gold);margin:0 auto 36px;position:relative}
.concept-body{font-family:var(--sans);font-size:14px;font-weight:300;line-height:2.4;color:rgba(255,255,255,.6);max-width:580px;position:relative;margin-bottom:44px}
.concept-link{font-family:var(--cor);font-size:13px;letter-spacing:.14em;color:var(--gold);text-transform:uppercase;display:inline-flex;align-items:center;gap:12px;position:relative;transition:gap .25s}
.concept-link::before{content:'';display:block;width:36px;height:1px;background:var(--gold);transition:width .25s}
.concept-link:hover::before{width:56px}

/* ══════════════════════
   FLOW STEPS
══════════════════════ */
.flow-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:2px;margin-top:56px}
.step-card{background:#fff;border:1px solid var(--border);padding:32px 24px;position:relative;transition:border-color .2s,transform .2s}
.step-card:hover{border-color:var(--gold);transform:translateY(-3px)}
.step-num{font-family:var(--cor);font-size:36px;font-weight:300;color:var(--border);letter-spacing:-.02em;margin-bottom:16px;line-height:1;transition:color .2s}
.step-card:hover .step-num{color:var(--gold)}
.step-en{font-family:var(--cor);font-size:10px;letter-spacing:.2em;color:var(--gold);text-transform:uppercase;margin-bottom:6px}
.step-ja{font-family:var(--serif);font-size:15px;font-weight:700;color:var(--navy);margin-bottom:10px}
.step-desc{font-family:var(--sans);font-size:12px;font-weight:300;color:var(--sub);line-height:1.9}
.step-badge{position:absolute;top:16px;right:16px;background:var(--gold);color:#fff;font-family:var(--sans);font-size:9px;letter-spacing:.06em;padding:3px 8px;border-radius:2px}

/* 3D Demo Button */
.demo-cta-btn{display:flex;align-items:center;gap:12px;background:var(--navy);border:none;border-radius:4px;padding:14px 18px;text-decoration:none;transition:background .2s,transform .15s,box-shadow .2s;cursor:pointer;box-shadow:0 4px 16px rgba(31,58,95,.18);position:relative;overflow:hidden;margin-top:20px}
.demo-cta-btn::before{content:'';position:absolute;inset:0;background:linear-gradient(135deg,rgba(184,146,59,.18) 0%,transparent 60%);opacity:0;transition:opacity .2s}
.demo-cta-btn:hover{background:#162d4f;transform:translateY(-2px);box-shadow:0 8px 24px rgba(31,58,95,.28)}
.demo-cta-btn:hover::before{opacity:1}
.demo-cta-icon{width:36px;height:36px;border-radius:50%;background:rgba(184,146,59,.18);border:1px solid rgba(184,146,59,.4);display:flex;align-items:center;justify-content:center;flex-shrink:0;color:var(--gold);transition:background .2s,border-color .2s}
.demo-cta-btn:hover .demo-cta-icon{background:rgba(184,146,59,.3);border-color:var(--gold)}
.demo-cta-text{display:flex;flex-direction:column;gap:2px;flex:1}
.demo-cta-main{font-family:var(--sans);font-size:13px;font-weight:400;color:#fff;letter-spacing:.04em;line-height:1.3}
.demo-cta-sub{font-family:var(--sans);font-size:10px;font-weight:300;color:rgba(255,255,255,.5);letter-spacing:.04em}
.demo-cta-arrow{color:var(--gold);flex-shrink:0;transition:transform .2s}
.demo-cta-btn:hover .demo-cta-arrow{transform:translateX(3px)}

/* ══════════════════════
   CONTACT CTA SECTION
══════════════════════ */
.contact-section{background:var(--navy);padding:100px 48px;text-align:center;position:relative;overflow:hidden}
.contact-bg-text{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);font-family:var(--cor);font-size:180px;font-weight:300;color:rgba(255,255,255,.03);white-space:nowrap;pointer-events:none}
.contact-en{font-family:var(--cor);font-size:11px;letter-spacing:.22em;color:var(--gold);text-transform:uppercase;margin-bottom:28px;position:relative}
.contact-h{font-family:var(--serif);font-size:30px;font-weight:700;color:#fff;line-height:1.5;margin-bottom:20px;position:relative;white-space:nowrap}
.contact-sub{font-family:var(--sans);font-size:13px;font-weight:300;color:rgba(255,255,255,.5);line-height:2.1;margin-bottom:48px;position:relative}
.contact-btns{display:flex;gap:16px;justify-content:center;flex-wrap:wrap;position:relative}
.btn-gold{background:var(--gold);color:#fff;border:1px solid var(--gold);border-radius:4px;padding:15px 44px;font-family:var(--cor);font-size:14px;letter-spacing:.14em;text-transform:uppercase;cursor:pointer;transition:background .2s;display:inline-flex;align-items:center;gap:10px}
.btn-gold:hover{background:#9e7c32;border-color:#9e7c32}
.btn-line{background:#06C755;color:#fff;border:1px solid #06C755;border-radius:4px;padding:15px 44px;font-family:var(--cor);font-size:14px;letter-spacing:.14em;text-transform:uppercase;cursor:pointer;transition:background .2s;display:inline-flex;align-items:center;gap:10px}
.btn-line:hover{background:#05a848;border-color:#05a848}
.btn-line svg,.btn-gold svg{width:18px;height:18px;fill:currentColor;flex-shrink:0}
.contact-tel{margin-top:36px;font-family:var(--cor);font-size:13px;letter-spacing:.08em;color:rgba(255,255,255,.35);position:relative}
.contact-tel a{color:rgba(255,255,255,.65);transition:color .2s}.contact-tel a:hover{color:#fff}

/* ══════════════════════
   FOOTER
══════════════════════ */
footer{border-top:1px solid var(--border);padding:36px 48px;display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:20px}
.footer-logo{font-family:var(--cor);font-size:14px;letter-spacing:.16em;color:var(--navy);text-transform:uppercase;display:flex;align-items:center;gap:10px}
.footer-logo-mark{height:34px;width:auto;display:block;flex-shrink:0}
.footer-logo-text{display:flex;flex-direction:column;line-height:1.2}
.footer-logo small{display:block;font-family:var(--sans);font-size:10px;font-weight:300;color:var(--sub);margin-top:3px;letter-spacing:.06em;text-transform:none}
.footer-nav{display:flex;gap:24px;flex-wrap:wrap}
.footer-nav a{font-family:var(--sans);font-size:12px;color:var(--sub);transition:color .2s}
.footer-nav a:hover{color:var(--navy)}
.footer-sns{display:flex;gap:10px}
.footer-sns a{width:32px;height:32px;border:1px solid var(--border);border-radius:50%;display:flex;align-items:center;justify-content:center;color:var(--sub);transition:all .2s}
.footer-sns a:hover{border-color:var(--navy);color:var(--navy)}
.footer-sns a svg{width:14px;height:14px;fill:currentColor}
.footer-copy{font-family:var(--cor);font-size:10px;letter-spacing:.06em;color:var(--sub)}

/* ══════════════════════
   RESPONSIVE
══════════════════════ */
@media(max-width:1024px){
  .works-grid{grid-template-columns:repeat(2,1fr)}
  .flow-grid{grid-template-columns:repeat(2,1fr)}
  header{padding:0 24px}
  .section{padding:80px 24px}
  .page-hero{padding-left:24px;padding-right:24px}
  .concept-band{padding:80px 24px}
  .contact-section{padding:80px 24px}
  footer{padding:28px 24px}
}
@media(max-width:640px){
  header{height:68px;padding:0 16px}
  .mobile-nav{top:68px}
  /* ヘッダー高さがモバイルでは小さくなるので、ヒーロー類の上余白も調整 */
  .hero{padding-top:68px}
  .page-hero{padding-top:68px}
  .detail-hero{padding-top:68px}
  .logo small{display:block;font-size:9px;margin-top:2px;letter-spacing:.06em}
  .logo-mark{height:36px}
  .logo{font-size:13px;gap:8px;letter-spacing:.12em}
  /* ハンバーガーは右端ギリギリに */
  .hamburger{margin-left:0;width:38px;height:38px}
  nav .nav-a{display:none}
  nav .lang-btn{display:none}
  nav .header-sns{display:none}
  .hamburger{display:flex !important}
  .works-grid{grid-template-columns:1fr}
  .flow-grid{grid-template-columns:1fr}
  .concept-h{font-size:22px}
  .contact-h{font-size:22px;white-space:normal}
  .contact-btns{flex-direction:column;align-items:center}
  footer{flex-direction:column;align-items:flex-start}
  .footer-nav{flex-wrap:wrap}
  .page-hero-ja{font-size:28px}
  .page-hero-bg-text{font-size:80px}
}

/* ══════════════════════
   HAMBURGER MENU
══════════════════════ */
.hamburger{
  display:none;flex-direction:column;justify-content:center;align-items:center;
  width:44px;height:44px;gap:5px;
  background:none;border:none;cursor:pointer;
  margin-left:8px;flex-shrink:0;z-index:300;
}
.hamburger span{
  display:block;width:22px;height:1.5px;background:var(--navy);border-radius:2px;
  transition:transform .3s ease,opacity .3s ease;transform-origin:center;
}
.hamburger.open span:nth-child(1){transform:translateY(6.5px) rotate(45deg)}
.hamburger.open span:nth-child(2){opacity:0;transform:scaleX(0)}
.hamburger.open span:nth-child(3){transform:translateY(-6.5px) rotate(-45deg)}

.mobile-nav{
  position:fixed;top:84px;left:0;right:0;bottom:0;
  background:rgba(251,249,245,.97);backdrop-filter:blur(16px);
  z-index:190;flex-direction:column;
  padding:40px 32px 48px;overflow-y:auto;
  opacity:0;transform:translateY(-8px);
  transition:opacity .28s ease,transform .28s ease;
  pointer-events:none;display:none;
}
.mobile-nav.open{display:flex;opacity:1;transform:translateY(0);pointer-events:auto}
.mobile-nav-links{display:flex;flex-direction:column;gap:0;border-top:1px solid var(--border);margin-bottom:40px}
.mobile-nav-link{
  font-family:var(--serif);font-size:22px;font-weight:700;color:var(--navy);
  padding:20px 0;border-bottom:1px solid var(--border);
  display:flex;align-items:center;justify-content:space-between;transition:color .2s;
}
.mobile-nav-link::after{
  content:'→';font-family:var(--cor);font-size:18px;color:var(--gold);
  opacity:0;transform:translateX(-6px);transition:opacity .2s,transform .2s;
}
.mobile-nav-link:hover,.mobile-nav-link.active{color:var(--gold)}
.mobile-nav-link:hover::after,.mobile-nav-link.active::after{opacity:1;transform:translateX(0)}
.mobile-nav-bottom{margin-top:auto;display:flex;flex-direction:column;gap:12px}
.mobile-nav-line{
  display:flex;align-items:center;justify-content:center;gap:10px;
  background:#06C755;color:#fff;border-radius:4px;padding:16px;
  font-family:var(--cor);font-size:14px;letter-spacing:.12em;text-transform:uppercase;
}
.mobile-nav-line svg{width:18px;height:18px;fill:currentColor}
.mobile-nav-contact{
  display:flex;align-items:center;justify-content:center;
  border:1px solid var(--navy);color:var(--navy);border-radius:4px;padding:15px;
  font-family:var(--cor);font-size:13px;letter-spacing:.12em;text-transform:uppercase;transition:all .2s;
}
.mobile-nav-contact:hover{background:var(--navy);color:#fff}
.mobile-nav-sns{display:flex;gap:12px;justify-content:center;margin-top:8px}
.mobile-nav-sns a{
  width:40px;height:40px;border:1px solid var(--border);border-radius:50%;
  display:flex;align-items:center;justify-content:center;color:var(--sub);transition:all .2s;
}
.mobile-nav-sns a:hover{border-color:var(--navy);color:var(--navy)}
.mobile-nav-sns svg{width:16px;height:16px;fill:currentColor}