:root{
  --gold:#c9a227;
  --gold-light:#e4c663;
  --navy:#0b1420;
  --navy-soft:#14202f;
  --ink:#2b2b28;
  --paper:#ffffff;
  --paper-soft:#faf7ef;
  --line:#e7e1d0;
  --radius:4px;
  --maxw:1180px;
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  font-family:"Noto Sans JP",sans-serif;
  color:var(--ink);
  background:var(--paper);
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;}
h1,h2,h3{font-family:"Noto Serif JP","Noto Sans JP",sans-serif;margin:0;}

.demo-ribbon{
  background:var(--navy);
  color:var(--gold-light);
  text-align:center;
  font-size:12px;
  letter-spacing:.08em;
  padding:6px 10px;
}

/* header */
.site-header{
  position:fixed;top:30px;left:0;right:0;z-index:50;
  background:rgba(11,20,32,0);
  transition:background .4s ease, box-shadow .4s ease, top .3s ease;
}
.site-header.scrolled{
  background:rgba(11,20,32,.92);
  box-shadow:0 4px 18px rgba(0,0,0,.18);
}
.header-inner{
  max-width:var(--maxw);margin:0 auto;padding:14px 20px;
  display:flex;align-items:center;gap:28px;
}
.logo{display:flex;align-items:center;gap:10px;flex:0 0 auto;}
.logo-text{color:#fff;font-weight:700;font-size:16px;letter-spacing:.02em;}
.logo-text small{display:block;font-weight:400;font-size:10px;color:var(--gold-light);letter-spacing:.1em;}
.main-nav{display:flex;gap:26px;margin-left:auto;}
.main-nav a{color:#fff;font-size:14px;letter-spacing:.04em;opacity:.9;transition:opacity .2s;}
.main-nav a:hover{opacity:1;color:var(--gold-light);}
.btn-contact{
  background:#8a0f1a;color:#fff;font-size:13px;letter-spacing:.05em;
  padding:12px 20px;border-radius:2px;white-space:nowrap;
}
.hamburger{display:none;flex-direction:column;gap:5px;background:none;border:0;cursor:pointer;padding:6px;}
.hamburger span{width:22px;height:2px;background:#fff;display:block;}

/* hero */
.hero{
  position:relative;
  height:100vh;
  min-height:560px;
  display:flex;
  align-items:flex-end;
  overflow:hidden;
  background:var(--navy);
}
.hero-fallback{
  position:absolute;inset:0;
  background:
    radial-gradient(ellipse at 70% 20%, rgba(201,162,39,.25), transparent 55%),
    linear-gradient(160deg,#0b1420 0%, #101a28 55%, #1a2538 100%);
}
.hero-video{
  position:absolute;inset:0;
  width:100%;height:100%;
  object-fit:cover;
  opacity:0;
  transform:scale(1.04);
  transition:opacity 2.6s ease, transform 8s ease;
  filter:brightness(1) saturate(1.1);
}
.hero-video.visible{opacity:1;transform:scale(1);}
.hero-overlay{
  position:absolute;inset:0;
  background:
    linear-gradient(0deg, rgba(5,9,15,.82) 0%, rgba(5,9,15,.25) 42%, rgba(5,9,15,.08) 68%, rgba(5,9,15,.3) 100%),
    linear-gradient(90deg, rgba(5,9,15,.35) 0%, rgba(5,9,15,0) 38%);
}
.hero-handshake-wrap{
  position:absolute;
  right:6%;
  top:50%;
  transform:translateY(-50%);
  width:40%;
  max-width:480px;
  opacity:0;
  animation:handshakeIn 1.6s ease forwards;
  animation-delay:.4s;
  border-radius:6px;
  overflow:hidden;
  box-shadow:0 24px 60px rgba(0,0,0,.45), 0 0 0 1px rgba(201,162,39,.35);
  pointer-events:none;
}
.hero-handshake-wrap::after{
  content:"";position:absolute;inset:0;
  background:linear-gradient(160deg, rgba(201,162,39,.22), transparent 60%);
  mix-blend-mode:overlay;
}
.hero-handshake{
  width:100%;display:block;
  filter:saturate(1.08) contrast(1.02);
}
@keyframes handshakeIn{
  from{opacity:0;transform:translateY(-50%) scale(.97);}
  to{opacity:1;transform:translateY(-50%) scale(1);}
}
.hero-content{
  position:relative;z-index:2;
  max-width:var(--maxw);
  margin:0 auto;
  width:100%;
  padding:0 20px 90px;
  color:#fff;
}
.hero-eyebrow{
  letter-spacing:.3em;font-size:12px;color:var(--gold-light);margin:0 0 14px;
}
.hero-copy{
  font-size:clamp(28px,4.4vw,52px);
  line-height:1.5;
  font-weight:700;
  margin:0 0 16px;
}
.hero-sub{
  font-size:14px;color:rgba(255,255,255,.82);letter-spacing:.03em;
}
.fade-in{opacity:0;transform:translateY(16px);animation:fadeUp 1s ease forwards;}
.fade-in.delay-1{animation-delay:.25s;}
.fade-in.delay-2{animation-delay:.5s;}
@keyframes fadeUp{to{opacity:1;transform:translateY(0);}}

.scroll-hint{
  position:absolute;right:26px;bottom:26px;z-index:2;
  color:#fff;font-size:10px;letter-spacing:.2em;
  display:flex;flex-direction:column;align-items:center;gap:8px;
}
.scroll-hint span{
  width:1px;height:34px;background:rgba(255,255,255,.6);
  position:relative;overflow:hidden;
}
.scroll-hint span::after{
  content:"";position:absolute;left:0;top:-100%;width:100%;height:100%;
  background:var(--gold-light);
  animation:scrollDown 1.8s ease-in-out infinite;
}
@keyframes scrollDown{
  0%{top:-100%;} 60%{top:100%;} 100%{top:100%;}
}

/* news */
.news-strip{
  background:linear-gradient(90deg, var(--paper-soft), #fff 60%);
  border-bottom:1px solid var(--line);
}
.news-inner{
  max-width:var(--maxw);margin:0 auto;padding:18px 20px;
  display:flex;align-items:center;gap:16px;flex-wrap:wrap;
}
.news-label{font-weight:700;letter-spacing:.1em;color:var(--navy);}
.news-date{color:#8a8470;font-size:13px;}
.news-tag{background:var(--navy);color:#fff;font-size:11px;padding:3px 10px;border-radius:2px;}
.news-text{font-size:14px;flex:1;min-width:200px;}
.news-more{background:var(--ink);color:#fff;font-size:12px;padding:10px 16px;white-space:nowrap;}

/* section heads */
.section-head{text-align:center;padding:70px 20px 10px;}
.section-kicker{color:var(--gold);font-weight:700;letter-spacing:.15em;font-size:14px;margin:0 0 6px;}
.section-title{font-size:26px;font-weight:700;}

/* greeting */
.greeting-lead{
  max-width:720px;margin:0 auto;padding:10px 20px 50px;
  text-align:center;line-height:2.1;color:#4a463c;font-size:15px;
}
.business-intro{
  max-width:var(--maxw);margin:0 auto;padding:10px 20px 70px;text-align:center;
}
.business-intro h3{font-size:22px;margin-bottom:8px;}
.business-intro > p{color:#8a8470;margin:0 0 46px;font-size:14px;}

.diamond-grid{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:46px 28px;
  max-width:880px;
  margin:0 auto;
}
.diamond-item{display:flex;flex-direction:column;align-items:center;gap:14px;}
.diamond{
  width:128px;height:128px;
  clip-path:polygon(50% 0%, 100% 50%, 50% 100%, 0% 50%);
  box-shadow:0 10px 24px rgba(11,20,32,.18);
  transition:transform .35s ease;
  background:var(--navy);
}
.diamond img{width:100%;height:100%;object-fit:cover;transition:transform .5s ease;}
.diamond-item:hover .diamond{transform:translateY(-6px);}
.diamond-item:hover .diamond img{transform:scale(1.12);}
.diamond-label{font-size:13px;letter-spacing:.05em;color:var(--ink);font-weight:500;}

.mission{
  max-width:640px;margin:0 auto;padding:30px 20px 90px;
  text-align:center;line-height:2.1;color:#4a463c;font-size:14px;
}
.mission-head{font-weight:700;font-size:16px;color:var(--navy);margin-bottom:10px;}
.mission-quote{color:var(--gold);font-weight:700;font-size:16px;margin:18px 0;}

/* cta strip */
.cta-strip{
  background:var(--navy);color:#fff;text-align:center;padding:60px 20px;
}
.cta-strip h2{font-size:24px;margin-bottom:10px;}
.cta-strip p{color:var(--gold-light);font-size:15px;margin:0;}

/* information */
.information{padding-bottom:80px;}
.info-cards{
  max-width:var(--maxw);margin:0 auto;padding:0 20px;
  display:grid;grid-template-columns:repeat(4,1fr);gap:18px;
}
.info-card{
  position:relative;aspect-ratio:3/4;overflow:hidden;border-radius:var(--radius);
}
.info-card img{width:100%;height:100%;object-fit:cover;transition:transform .5s ease;}
.info-card:hover img{transform:scale(1.08);}
.info-card::after{
  content:"";position:absolute;inset:0;
  background:linear-gradient(0deg, rgba(0,0,0,.55), rgba(0,0,0,.05) 55%);
}
.info-card-text{position:absolute;left:0;right:0;bottom:16px;z-index:2;text-align:center;color:#fff;}
.info-card-text span{display:block;font-weight:700;font-size:16px;}
.info-card-text small{font-size:11px;letter-spacing:.1em;color:var(--gold-light);}

/* contact */
.contact{
  text-align:center;padding:90px 20px;background:var(--paper-soft);
}
.contact h2{font-size:24px;margin-bottom:12px;}
.contact p{color:#6b6655;margin:0 0 26px;font-size:14px;}
.btn-contact-lg{
  display:inline-block;background:#8a0f1a;color:#fff;
  padding:16px 42px;font-size:15px;letter-spacing:.05em;border-radius:2px;
}
.contact-tel{margin-top:20px;font-size:13px;color:#8a8470;}

/* footer */
.site-footer{background:var(--navy);color:rgba(255,255,255,.75);padding:40px 20px;}
.footer-inner{max-width:var(--maxw);margin:0 auto;text-align:center;}
.footer-logo{color:#fff;font-weight:700;letter-spacing:.05em;margin-bottom:14px;}
.footer-nav{display:flex;justify-content:center;gap:20px;margin-bottom:16px;flex-wrap:wrap;}
.footer-nav a{font-size:12px;opacity:.85;}
.footer-copy{font-size:11px;opacity:.6;}

/* responsive */
@media (max-width:880px){
  .main-nav{display:none;}
  .hamburger{display:flex;}
  .diamond-grid{grid-template-columns:repeat(3,1fr);gap:34px 16px;max-width:420px;}
  .diamond{width:96px;height:96px;}
  .info-cards{grid-template-columns:repeat(2,1fr);}
  .hero-handshake-wrap{width:78%;max-width:340px;right:50%;transform:translate(50%,-50%);top:38%;}
  .hero-content{padding-bottom:60px;}
}
@media (max-width:480px){
  .diamond-grid{grid-template-columns:repeat(2,1fr);}
  .header-inner{padding:12px 16px;}
  .btn-contact{padding:10px 14px;font-size:12px;}
  .news-inner{padding:14px 16px;}
}