/* ============================================================
   SEIKA GROUP — Corporate Site
   ============================================================ */
:root{
  --orange:#d97a2b;
  --orange-d:#c26a1f;
  --orange-l:#e89a4e;
  --teal:#2ca7ad;
  --ink:#2b2926;
  --ink-soft:#5a564f;
  --muted:#938d84;
  --line:#e7e2da;
  --bg:#ffffff;
  --bg-cream:#f8f5f0;
  --bg-dark:#2b2926;
  --serif:'Shippori Mincho', serif;
  --sans:'Noto Sans JP', sans-serif;
  --maxw:1160px;
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:var(--sans);
  color:var(--ink);
  background:var(--bg);
  line-height:1.9;
  font-weight:400;
  -webkit-font-smoothing:antialiased;
  letter-spacing:.02em;
  overflow-x:hidden;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
.container{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 28px}

/* ---------- shared section ---------- */
.section{padding:110px 0}
.sec-label{
  font-family:var(--sans);
  font-size:.72rem;letter-spacing:.34em;font-weight:700;
  color:var(--orange);margin-bottom:18px;
}
.sec-label.light{color:var(--orange-l)}
.sec-title{
  font-family:var(--serif);
  font-weight:600;
  font-size:clamp(1.7rem,3.4vw,2.5rem);
  line-height:1.5;letter-spacing:.06em;color:var(--ink);
}
.sec-title.light{color:#fff}
.sec-head.center{text-align:center;margin-bottom:60px}
.sec-desc{max-width:640px;margin:24px auto 0;color:var(--ink-soft);font-size:.98rem}
.lead{font-family:var(--serif);font-size:1.15rem;color:var(--orange-d);margin:6px 0 26px;letter-spacing:.05em}
.body-text{color:var(--ink-soft);font-size:.97rem;margin-bottom:18px}
.body-text.light{color:rgba(255,255,255,.82)}
.sp-br{display:none}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.5em;
  font-family:var(--sans);font-weight:500;font-size:.92rem;letter-spacing:.08em;
  padding:15px 34px;border-radius:2px;transition:.35s ease;cursor:pointer;border:1px solid transparent;
}
.btn-primary{background:var(--orange);color:#fff}
.btn-primary:hover{background:var(--orange-d);transform:translateY(-2px);box-shadow:0 12px 26px rgba(217,122,43,.28)}
.btn-ghost{border-color:rgba(255,255,255,.7);color:#fff;background:transparent}
.btn-ghost:hover{background:#fff;color:var(--ink);border-color:#fff}
.btn-lg{padding:18px 44px;font-size:1rem}

/* ============ HEADER ============ */
.site-header{
  position:fixed;top:0;left:0;width:100%;z-index:100;
  background:rgba(255,255,255,0);
  transition:.4s ease;
}
.site-header.scrolled{background:rgba(255,255,255,.96);box-shadow:0 1px 14px rgba(0,0,0,.06);backdrop-filter:blur(6px)}
.header-inner{
  max-width:1280px;margin:0 auto;padding:0 30px;height:82px;
  display:flex;align-items:center;gap:30px;
}
.brand{display:flex;align-items:center;gap:12px}
.brand-mark{width:12px;height:12px;background:var(--orange);display:inline-block;transform:rotate(45deg);flex:none}
.brand-text{display:flex;flex-direction:column;line-height:1.25}
.brand-en{font-family:var(--serif);font-weight:600;font-size:1.18rem;letter-spacing:.14em;color:var(--ink)}
.brand-jp{font-size:.62rem;letter-spacing:.18em;color:var(--muted)}
.site-header:not(.scrolled) .brand-en,
.site-header:not(.scrolled) .header-tel-num{color:#fff}
.site-header:not(.scrolled) .brand-jp,
.site-header:not(.scrolled) .header-tel-label{color:rgba(255,255,255,.8)}
.site-header:not(.scrolled) .gnav a{color:#fff}

.gnav{margin-left:auto;display:flex;align-items:center;gap:30px}
.gnav a{font-size:.88rem;font-weight:500;letter-spacing:.06em;color:var(--ink-soft);position:relative;transition:.3s}
.gnav a:not(.gnav-cta)::after{content:"";position:absolute;left:0;bottom:-6px;width:0;height:2px;background:var(--orange);transition:.3s}
.gnav a:not(.gnav-cta):hover::after{width:100%}
.gnav a:hover{color:var(--orange)}
.gnav-cta{background:var(--orange);color:#fff!important;padding:10px 22px;border-radius:2px}
.gnav-cta:hover{background:var(--orange-d)}
.header-tel{display:flex;flex-direction:column;text-align:right;line-height:1.2}
.header-tel-label{font-size:.6rem;letter-spacing:.14em;color:var(--muted)}
.header-tel-num{font-family:var(--serif);font-weight:600;font-size:1.1rem;color:var(--ink);letter-spacing:.04em}

.nav-toggle{display:none;flex-direction:column;gap:5px;width:34px;height:28px;background:none;border:none;cursor:pointer;margin-left:auto}
.nav-toggle span{display:block;height:2px;width:100%;background:var(--ink);transition:.3s}
.site-header:not(.scrolled) .nav-toggle span{background:#fff}

/* ============ HERO ============ */
.hero{position:relative;height:100vh;min-height:640px;display:flex;align-items:center;color:#fff;overflow:hidden}
.hero-media{position:absolute;inset:0;z-index:-2}
.hero-media img{width:100%;height:100%;object-fit:cover;animation:heroZoom 14s ease-out forwards}
@keyframes heroZoom{from{transform:scale(1.12)}to{transform:scale(1)}}
.hero-overlay{position:absolute;inset:0;background:linear-gradient(100deg,rgba(30,26,22,.62) 0%,rgba(30,26,22,.30) 45%,rgba(30,26,22,.08) 100%)}
.hero-body{position:relative;z-index:2;max-width:var(--maxw);margin:0 auto;padding:0 30px;width:100%}
.hero-eyebrow{font-size:.74rem;letter-spacing:.34em;font-weight:600;color:var(--orange-l);margin-bottom:26px}
.hero-title{
  font-family:var(--serif);font-weight:600;
  font-size:clamp(2.1rem,6vw,4.1rem);line-height:1.42;letter-spacing:.09em;
  text-shadow:0 2px 30px rgba(0,0,0,.28);
}
.hero-sub{margin-top:26px;font-size:clamp(.95rem,2vw,1.18rem);letter-spacing:.12em;font-weight:300;color:rgba(255,255,255,.94)}
.hero-actions{margin-top:44px;display:flex;gap:16px;flex-wrap:wrap}
.hero-scroll{position:absolute;bottom:34px;left:50%;transform:translateX(-50%);z-index:2;font-size:.62rem;letter-spacing:.3em;color:#fff;writing-mode:vertical-rl}
.hero-scroll span{position:relative;padding-bottom:52px}
.hero-scroll span::after{content:"";position:absolute;bottom:0;left:50%;width:1px;height:40px;background:rgba(255,255,255,.7);animation:scrollLine 2s ease-in-out infinite}
@keyframes scrollLine{0%{transform:scaleY(0);transform-origin:top}50%{transform:scaleY(1);transform-origin:top}51%{transform-origin:bottom}100%{transform:scaleY(0);transform-origin:bottom}}

/* ============ ABOUT ============ */
.about{background:var(--bg)}
.about-grid{display:grid;grid-template-columns:1fr 1fr;gap:70px;align-items:center}
.about-visual{position:relative}
.about-visual img{border-radius:2px;clip-path:polygon(0 0,100% 0,100% 92%,0 100%)}
.about-badge{
  position:absolute;right:-14px;bottom:24px;background:var(--orange);color:#fff;
  padding:20px 26px;text-align:center;box-shadow:0 16px 30px rgba(217,122,43,.3);
}
.about-badge-num{display:block;font-family:var(--serif);font-size:1.9rem;font-weight:700;line-height:1}
.about-badge-txt{font-size:.68rem;letter-spacing:.2em}
.pill-row{display:flex;gap:14px;margin-top:30px}
.pill{display:inline-flex;align-items:center;padding:9px 22px;color:#fff;font-size:.86rem;font-weight:500;letter-spacing:.08em;transform:skewX(-8deg)}
.pill span,.pill{--x:0}
.pill-orange{background:var(--orange)}
.pill-teal{background:var(--teal)}

/* ============ SERVICES ============ */
.services{background:var(--bg-cream)}
.svc-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:26px}
.svc-card{background:#fff;overflow:hidden;box-shadow:0 6px 24px rgba(43,41,38,.05);transition:.4s ease;display:flex;flex-direction:column}
.svc-card:hover{transform:translateY(-6px);box-shadow:0 20px 40px rgba(43,41,38,.13)}
.svc-thumb{position:relative;aspect-ratio:4/3;overflow:hidden}
.svc-thumb img{width:100%;height:100%;object-fit:cover;transition:.6s ease}
.svc-card:hover .svc-thumb img{transform:scale(1.07)}
.svc-no{position:absolute;top:0;left:0;background:var(--orange);color:#fff;font-family:var(--serif);font-weight:700;font-size:.9rem;padding:6px 14px;letter-spacing:.05em}
.svc-body{padding:24px 22px 26px;flex:1;display:flex;flex-direction:column}
.svc-en{font-size:.62rem;letter-spacing:.2em;color:var(--orange);font-weight:700;margin-bottom:8px}
.svc-name{font-family:var(--serif);font-size:1.16rem;font-weight:600;letter-spacing:.05em;margin-bottom:12px}
.svc-text{font-size:.83rem;color:var(--ink-soft);line-height:1.85;flex:1}
.svc-tags{list-style:none;display:flex;flex-wrap:wrap;gap:7px;margin-top:16px}
.svc-tags li{font-size:.68rem;color:var(--orange-d);background:rgba(217,122,43,.09);padding:4px 11px;border-radius:20px;letter-spacing:.04em}
.svc-card--cta{background:linear-gradient(150deg,var(--orange) 0%,var(--orange-d) 100%);color:#fff}
.svc-card--cta:hover{box-shadow:0 20px 40px rgba(217,122,43,.35)}
.svc-cta-inner{padding:34px 26px;display:flex;flex-direction:column;height:100%;justify-content:center}
.svc-card--cta .svc-en{color:rgba(255,255,255,.85)}
.svc-card--cta .svc-name{color:#fff;font-size:1.4rem;line-height:1.5}
.svc-card--cta .svc-text{color:rgba(255,255,255,.9);flex:none;margin:14px 0 24px}
.svc-card--cta .btn-primary{background:#fff;color:var(--orange-d);align-self:flex-start}
.svc-card--cta .btn-primary:hover{background:var(--ink);color:#fff}

/* ============ BUSINESS LIST ============ */
.biz{background:#fff;padding-top:96px;padding-bottom:96px}
.biz-list{list-style:none;display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--line);border:1px solid var(--line)}
.biz-list li{background:#fff;padding:22px 20px;font-size:.92rem;letter-spacing:.04em;position:relative;transition:.3s;display:flex;align-items:center;gap:12px}
.biz-list li::before{content:"";width:7px;height:7px;background:var(--orange);transform:rotate(45deg);flex:none}
.biz-list li:hover{background:var(--bg-cream);color:var(--orange-d)}

/* ============ STRENGTHS ============ */
.strengths{background:var(--bg-cream)}
.str-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:28px}
.str-card{background:#fff;padding:44px 40px;position:relative;border-top:3px solid var(--orange);transition:.35s}
.str-card:hover{transform:translateY(-4px);box-shadow:0 18px 36px rgba(43,41,38,.09)}
.str-num{font-family:var(--serif);font-size:2.4rem;font-weight:700;color:var(--orange);opacity:.28;line-height:1;display:block;margin-bottom:12px}
.str-title{font-family:var(--serif);font-size:1.28rem;font-weight:600;letter-spacing:.04em;margin-bottom:16px}
.str-text{font-size:.9rem;color:var(--ink-soft)}

/* ============ STATS ============ */
.stats{background:var(--ink);color:#fff;padding:70px 0}
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:30px;text-align:center}
.stat-num{font-family:var(--serif);font-size:3rem;font-weight:700;color:var(--orange-l);line-height:1;display:block}
.stat-num small{font-size:1.1rem;margin-left:2px}
.stat-label{display:block;margin-top:14px;font-size:.82rem;letter-spacing:.08em;color:rgba(255,255,255,.75)}

/* ============ SDGs ============ */
.sdgs{background:linear-gradient(135deg,#26639e 0%,#1f4f7e 100%);color:#fff}
.sdgs-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:64px;align-items:center}
.sdgs-points{list-style:none;margin-top:22px;display:flex;flex-direction:column;gap:12px}
.sdgs-points li{padding-left:28px;position:relative;font-size:.94rem;color:rgba(255,255,255,.92)}
.sdgs-points li::before{content:"✓";position:absolute;left:0;top:0;color:var(--orange-l);font-weight:700}
.sdgs-badges{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
.sdgs-chip{
  background:var(--c);color:#fff;min-height:96px;border-radius:6px;
  display:flex;align-items:center;justify-content:center;text-align:center;
  font-size:.9rem;font-weight:500;letter-spacing:.04em;padding:14px;line-height:1.5;
  box-shadow:0 8px 20px rgba(0,0,0,.18);transition:.3s;
}
.sdgs-chip:hover{transform:translateY(-4px) scale(1.03)}

/* ============ COMPANY ============ */
.company{background:#fff}
.company-wrap{max-width:880px;margin:0 auto}
.company-table{width:100%;border-collapse:collapse}
.company-table th,.company-table td{text-align:left;padding:20px 22px;border-bottom:1px solid var(--line);vertical-align:top;font-size:.92rem}
.company-table th{width:170px;font-family:var(--serif);font-weight:600;color:var(--ink);letter-spacing:.08em;background:var(--bg-cream)}
.company-table td{color:var(--ink-soft);line-height:1.8}
.muted-note{display:block;font-size:.8rem;color:var(--muted);margin-top:6px}

/* ============ CONTACT ============ */
.contact{
  position:relative;padding:120px 0;text-align:center;color:#fff;
  background:linear-gradient(rgba(43,41,38,.78),rgba(43,41,38,.8)),url('https://images.unsplash.com/photo-1600607687939-ce8a6c25118c?auto=format&fit=crop&w=1600&q=80') center/cover fixed;
}
.contact-title{font-family:var(--serif);font-size:clamp(1.7rem,4vw,2.6rem);font-weight:600;line-height:1.6;letter-spacing:.06em;margin-bottom:20px}
.contact-lead{color:rgba(255,255,255,.85);margin-bottom:44px}
.contact-actions{display:flex;gap:26px;justify-content:center;align-items:center;flex-wrap:wrap}
.contact-tel{display:flex;flex-direction:column;background:#fff;color:var(--ink);padding:18px 40px;border-radius:2px;transition:.3s}
.contact-tel:hover{transform:translateY(-2px);box-shadow:0 14px 30px rgba(0,0,0,.25)}
.contact-tel-label{font-size:.68rem;letter-spacing:.16em;color:var(--muted)}
.contact-tel-num{font-family:var(--serif);font-size:1.9rem;font-weight:700;color:var(--orange-d);letter-spacing:.03em;line-height:1.2}
.contact-tel-note{font-size:.68rem;color:var(--muted)}

/* ============ FOOTER ============ */
.site-footer{background:var(--bg-dark);color:rgba(255,255,255,.75);padding:64px 0 26px}
.footer-inner{display:flex;justify-content:space-between;gap:40px;flex-wrap:wrap;padding-bottom:40px;border-bottom:1px solid rgba(255,255,255,.12)}
.footer-brand .brand-en{color:#fff;font-size:1.4rem;letter-spacing:.16em}
.footer-addr{font-size:.82rem;margin-top:16px;line-height:1.9;color:rgba(255,255,255,.6)}
.footer-nav{display:flex;flex-wrap:wrap;gap:12px 30px;align-content:flex-start}
.footer-nav a{font-size:.86rem;color:rgba(255,255,255,.75);transition:.3s}
.footer-nav a:hover{color:var(--orange-l)}
.copyright{text-align:center;margin-top:26px;font-size:.72rem;letter-spacing:.1em;color:rgba(255,255,255,.4)}

/* ============ to-top ============ */
.to-top{
  position:fixed;right:26px;bottom:26px;width:48px;height:48px;border-radius:50%;
  background:var(--orange);color:#fff;display:flex;align-items:center;justify-content:center;
  font-size:1.2rem;z-index:90;opacity:0;pointer-events:none;transition:.4s;box-shadow:0 8px 20px rgba(217,122,43,.4);
}
.to-top.show{opacity:1;pointer-events:auto}
.to-top:hover{background:var(--orange-d);transform:translateY(-3px)}

/* ============ reveal animation ============ */
.reveal{opacity:0;transform:translateY(30px);transition:opacity .8s ease,transform .8s ease}
.reveal.in{opacity:1;transform:none}

/* ============ RESPONSIVE ============ */
@media(max-width:1020px){
  .svc-grid{grid-template-columns:repeat(2,1fr)}
  .biz-list{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:880px){
  .header-tel{display:none}
  .nav-toggle{display:flex}
  .gnav{
    position:fixed;top:0;right:0;height:100vh;width:min(80vw,320px);
    flex-direction:column;align-items:flex-start;justify-content:center;gap:26px;
    background:#fff;padding:0 40px;transform:translateX(100%);transition:.4s ease;box-shadow:-8px 0 30px rgba(0,0,0,.1);margin-left:0;
  }
  .gnav.open{transform:translateX(0)}
  .gnav a{color:var(--ink-soft)!important;font-size:1rem}
  .site-header:not(.scrolled) .gnav a{color:var(--ink-soft)}
  .nav-toggle.active span:nth-child(1){transform:translateY(7px) rotate(45deg)}
  .nav-toggle.active span:nth-child(2){opacity:0}
  .nav-toggle.active span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
  .site-header.menu-open .nav-toggle span{background:var(--ink)}
  .about-grid,.sdgs-grid{grid-template-columns:1fr;gap:48px}
  .about-visual{order:-1}
  .str-grid{grid-template-columns:1fr}
  .stats-grid{grid-template-columns:repeat(2,1fr);gap:40px 20px}
  .section{padding:80px 0}
  .sp-br{display:inline}
}
@media(max-width:560px){
  .svc-grid{grid-template-columns:1fr}
  .biz-list{grid-template-columns:1fr}
  .company-table th{width:120px;font-size:.82rem;padding:16px 12px}
  .company-table td{font-size:.85rem;padding:16px 12px}
  .hero-actions .btn{flex:1}
  .contact{background-attachment:scroll}
  .container{padding:0 20px}
}