:root{
  --brand:#20258a;
  --brand-dark:#171b61;
  --accent:#e60012;
  --ink:#20252b;
  --muted:#68717a;
  --line:#dfe3e8;
  --soft:#f6f7f9;
  --white:#fff;
  --max:1120px;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  color:var(--ink);
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Noto Sans JP","Hiragino Kaku Gothic ProN","Yu Gothic",Meiryo,sans-serif;
  background:#fff;
  line-height:1.8;
}
a{color:inherit;text-decoration:none}
img{display:block;max-width:100%}
button{font:inherit}
.wrap{width:min(var(--max),calc(100% - 40px));margin:auto}
.section{padding:76px 0}
.section-head{max-width:790px;margin-bottom:38px}
.section-head h2,
.intro-copy h2,
.faq-side h2,
.cta-text h2{
  margin:0;
  font-size:clamp(30px,3.8vw,44px);
  line-height:1.28;
  letter-spacing:-.035em;
  font-weight:800;
}
.section-head h2,
.intro-copy h2,
.faq-side h2{
  position:relative;
  padding:0 0 16px 18px;
  border-bottom:1px solid var(--line);
}
.section-head h2:before,
.intro-copy h2:before,
.faq-side h2:before{
  content:"";
  position:absolute;
  left:0;
  top:.15em;
  width:4px;
  height:1.05em;
  background:var(--brand);
}
.section-head h2:after,
.intro-copy h2:after,
.faq-side h2:after{
  content:"";
  position:absolute;
  left:18px;
  bottom:-1px;
  width:54px;
  height:2px;
  background:var(--accent);
}
.section-head p,
.intro-copy p,
.faq-side p,
.cta-text p{color:var(--muted)}
.eyebrow{
  display:flex;
  align-items:center;
  gap:9px;
  margin-bottom:11px;
  color:var(--brand);
  font-size:11px;
  font-weight:800;
  letter-spacing:.17em;
  text-transform:uppercase;
}
.eyebrow:before{
  content:"";
  width:18px;
  height:2px;
  background:var(--accent);
  flex:0 0 auto;
}

/* brand bar */
.brandbar{
  height:78px;
  display:flex;
  align-items:center;
  background:#fff;
  border-bottom:1px solid #eceef1;
}
.brandbar-inner{display:flex;align-items:center;justify-content:space-between;gap:24px}
.brand-logo{width:176px;height:auto}
.brandbar-copy{font-size:12px;color:#777f87;letter-spacing:.04em}

/* hero */
.hero{
  position:relative;
  min-height:510px;
  display:flex;
  align-items:center;
  overflow:hidden;
  color:#fff;
  background:#222;
}
.hero:before{
  content:"";
  position:absolute;
  inset:0;
  background:url('https://www.kk-step.jp/feature/intex_osaka/assets/intex-osaka-hero.webp') center 56%/cover no-repeat;
}
.hero:after{
  content:"";
  position:absolute;
  inset:0;
  background:linear-gradient(90deg,rgba(14,19,35,.82) 0%,rgba(14,19,35,.64) 48%,rgba(14,19,35,.22) 100%);
}
.hero-inner{position:relative;z-index:1;padding:76px 0;max-width:790px}
.hero-kicker{margin-bottom:16px;font-size:13px;font-weight:700;letter-spacing:.12em}
.hero-kicker:before{content:"";display:inline-block;width:30px;height:2px;margin:0 10px 4px 0;background:var(--accent)}
.hero h1{margin:0 0 20px;font-size:clamp(36px,5vw,60px);line-height:1.24;letter-spacing:-.035em;text-wrap:balance}
.hero p{max-width:720px;margin:0;font-size:17px;line-height:1.9;color:rgba(255,255,255,.92)}
.hero-actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:28px}
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  min-height:48px;
  padding:11px 20px;
  border:1px solid transparent;
  border-radius:3px;
  font-size:14px;
  font-weight:700;
  transition:.18s ease;
}
.btn-primary{background:#fff;color:var(--brand-dark)}
.btn-primary:hover{background:#f3f3f3}
.btn-ghost{border-color:rgba(255,255,255,.72);color:#fff;background:transparent}
.btn-ghost:hover{background:rgba(255,255,255,.09)}

/* simple key points */
.quick{border-bottom:1px solid var(--line);background:#fff}
.quick-grid{display:grid;grid-template-columns:repeat(3,1fr)}
.quick-item{position:relative;padding:27px 28px;border-right:1px solid var(--line)}
.quick-item:last-child{border-right:0}
.quick-item:before{content:"";position:absolute;left:0;top:0;width:34px;height:3px;background:var(--brand)}
.quick-item strong{display:block;margin-bottom:3px;font-size:17px}
.quick-item span{font-size:13px;color:var(--muted)}
.quick-no{margin-bottom:8px;font-size:11px;font-weight:700;color:#8b9299;letter-spacing:.1em}

/* intro */
.intro-grid{display:grid;grid-template-columns:330px 1fr;gap:64px;align-items:center}
.hall-card{
  padding:32px 0;
  border-top:3px solid var(--brand);
  border-bottom:1px solid var(--line);
}
.hall-card .small{font-size:12px;color:var(--muted);letter-spacing:.09em}
.hall-card .big{margin:14px 0 10px;font-size:72px;font-weight:800;line-height:1;color:var(--brand);letter-spacing:-.07em}
.intro-copy p{margin:18px 0 0;font-size:16px}

/* services */
.services{background:var(--soft)}
.service-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--line);border:1px solid var(--line)}
.service-card{background:#fff;padding:28px 27px;min-height:190px}
.icon{width:30px;height:30px;margin-bottom:19px;color:var(--brand)}
.icon svg{width:30px;height:30px;stroke:currentColor;fill:none;stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round}
.service-card h3{
  position:relative;
  margin:0 0 10px;
  padding-bottom:9px;
  font-size:18px;
  font-weight:800;
}
.service-card h3:after{
  content:"";
  position:absolute;
  left:0;
  bottom:0;
  width:28px;
  height:2px;
  background:var(--brand);
}
.service-card p{margin:0;color:var(--muted);font-size:13px;line-height:1.75}
.support-copy{margin-top:24px;padding:22px 25px;background:#fff;border-left:3px solid var(--brand);color:#4e5861;font-size:14px}

/* cases */
.cases{background:#fff}
.case-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}
.case-card{
  display:block;
  border:1px solid var(--line);
  background:#fff;
  transition:border-color .18s ease,transform .18s ease;
}
.case-card:hover{border-color:#aeb4bc;transform:translateY(-2px)}
.case-thumb{
  position:relative;
  aspect-ratio:16/9;
  overflow:hidden;
  background:#f0f1f3;
  border-bottom:1px solid var(--line);
}
.case-thumb:before{
  content:"CASE STUDY";
  position:absolute;
  inset:0;
  display:grid;
  place-items:center;
  font-size:12px;
  letter-spacing:.16em;
  color:#a2a7ad;
  z-index:0;
}
.case-thumb:after{
  content:"";
  position:absolute;
  left:0;
  bottom:0;
  z-index:2;
  width:54px;
  height:4px;
  background:var(--accent);
}
.case-thumb img{
  position:relative;
  z-index:1;
  width:100%;
  height:100%;
  object-fit:cover;
  transition:transform .35s ease;
  opacity:1;
}
.case-card:hover .case-thumb img{transform:scale(1.02)}
.case-body{padding:20px 22px 22px}
.case-meta{display:flex;align-items:center;gap:10px;margin-bottom:8px}
.case-year{font-size:12px;font-weight:700;color:var(--brand);letter-spacing:.06em}
.case-tags{display:flex;flex-wrap:wrap;gap:7px}
.tag{font-size:11px;color:#747b83}
.tag + .tag:before{content:"/";margin-right:7px;color:#b1b5ba}
.case-body h3{
  margin:0 0 8px;
  font-size:19px;
  line-height:1.5;
  font-weight:800;
  letter-spacing:-.015em;
}
.case-body p{margin:0 0 11px;font-size:13px;color:var(--muted);line-height:1.7}
.more{font-size:13px;font-weight:700;color:var(--brand)}
.allcases{margin-top:24px}
.allcases .btn{background:var(--brand);color:#fff}
.allcases .btn:hover{background:var(--brand-dark)}

/* records */
.records{
  position:relative;
  border-top:1px solid var(--line);
  border-bottom:1px solid var(--line);
  background:linear-gradient(180deg,#fafafa 0%,#f5f6f8 100%);
}
.records:before{
  content:"";
  position:absolute;
  left:0;
  top:0;
  width:100%;
  height:4px;
  background:linear-gradient(90deg,var(--brand) 0 78%,var(--accent) 78% 100%);
}
.record-grid{display:grid;grid-template-columns:repeat(5,1fr);border-top:1px solid var(--line)}
.record{padding:23px 18px;border-right:1px solid var(--line)}
.record:last-child{border-right:0}
.record span{display:block;margin-bottom:6px;font-size:11px;color:#92989e;letter-spacing:.08em}
.record strong{font-size:15px;line-height:1.55;font-weight:700}

/* faq */
.faq-wrap{display:grid;grid-template-columns:300px 1fr;gap:58px;align-items:start}
.faq-side p{margin:15px 0 0;font-size:14px}
.faq-list{border-top:1px solid var(--line)}
.faq-item{border-bottom:1px solid var(--line)}
.faq-q{
  width:100%;
  border:0;
  background:none;
  text-align:left;
  padding:20px 48px 20px 2px;
  position:relative;
  cursor:pointer;
  font-weight:700;
  font-size:16px;
  color:var(--ink);
}
.faq-q .qmark{color:var(--brand);margin-right:8px}
.faq-q:after,.faq-q:before{content:"";position:absolute;right:7px;top:50%;width:15px;height:1px;background:var(--brand);transition:.2s}
.faq-q:before{transform:rotate(90deg)}
.faq-item.open .faq-q:before{transform:rotate(0deg)}
.faq-a{display:grid;grid-template-rows:0fr;transition:grid-template-rows .25s ease}
.faq-a>div{overflow:hidden}
.faq-a p{margin:0;padding:0 38px 21px 30px;color:#58616a;font-size:14px;position:relative}
.faq-a p:before{content:"A.";position:absolute;left:2px;top:0;color:var(--accent);font-weight:700}
.faq-item.open .faq-a{grid-template-rows:1fr}

/* CTA */
.cta{padding:0 0 80px}
.cta-box{
  padding:40px 44px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:30px;
  color:#fff;
  background:var(--brand-dark);
  border-left:5px solid var(--accent);
}
.cta-text{max-width:650px}
.cta-text .eyebrow{color:#d7d9ff}
.cta-text .eyebrow:before{background:#fff}
.cta-text h2{font-weight:800;letter-spacing:-.03em}
.cta-text p{margin:12px 0 0;color:rgba(255,255,255,.78)}
.cta-actions{display:flex;gap:9px;flex-wrap:wrap}
.cta-actions .btn{background:#fff;color:var(--brand-dark)}
.cta-actions .btn.alt{background:transparent;color:#fff;border-color:rgba(255,255,255,.55)}

@media(max-width:900px){
  .section{padding:64px 0}
  .brandbar{height:70px}
  .brand-logo{width:155px}
  .brandbar-copy{display:none}
  .hero{min-height:470px}
  .hero-inner{padding:64px 0}
  .quick-grid{grid-template-columns:1fr}
  .quick-item{border-right:0;border-bottom:1px solid var(--line)}
  .quick-item:last-child{border-bottom:0}
  .intro-grid{grid-template-columns:1fr;gap:30px}
  .hall-card{max-width:420px}
  .service-grid{grid-template-columns:repeat(2,1fr)}
  .record-grid{grid-template-columns:repeat(2,1fr)}
  .record{border-bottom:1px solid var(--line)}
  .faq-wrap{grid-template-columns:1fr;gap:26px}
  .cta-box{display:block}
  .cta-actions{margin-top:24px}
}

@media(max-width:640px){
  .wrap{width:min(100% - 28px,var(--max))}
  .section{padding:54px 0}
  .section-head h2,
  .intro-copy h2,
  .faq-side h2{padding-left:14px}
  .section-head h2:after,
  .intro-copy h2:after,
  .faq-side h2:after{left:14px}
  .hero{min-height:530px;align-items:flex-end}
  .hero:before{background-position:58% center}
  .hero:after{background:linear-gradient(0deg,rgba(14,19,35,.90) 0%,rgba(14,19,35,.64) 58%,rgba(14,19,35,.20) 100%)}
  .hero-inner{padding:58px 0 46px}
  .hero h1{font-size:36px}
  .hero p{font-size:15px}
  .hero-actions{display:grid;grid-template-columns:1fr}
  .hall-card .big{font-size:60px}
  .service-grid{grid-template-columns:1fr}
  .service-card{min-height:auto}
  .case-grid{grid-template-columns:1fr}
  .case-body{padding:20px}
  .record-grid{grid-template-columns:1fr}
  .record{border-right:0}
  .faq-q{font-size:15px;padding-right:40px}
  .cta{padding-bottom:58px}
  .cta-box{padding:32px 24px}
  .cta-actions{display:grid;grid-template-columns:1fr}
}

/* =========================================================
   Fixed STEP global header / breadcrumb / local page navigation
   ========================================================= */
:root{
  --header-h:86px;
  --mobile-nav-h:0px;
}
html{scroll-padding-top:112px}
body{padding-top:var(--header-h)}

.site-header{
  position:fixed;
  z-index:1000;
  top:0;
  left:0;
  right:0;
  background:rgba(255,255,255,.98);
  border-bottom:1px solid #e8eaee;
  box-shadow:0 5px 18px rgba(25,31,45,.06);
  backdrop-filter:saturate(150%) blur(8px);
}
.site-header-main{height:var(--header-h)}
.site-header-inner{
  height:100%;
  display:flex;
  align-items:center;
  gap:26px;
}
.site-logo-link{
  display:flex;
  align-items:center;
  flex:0 0 auto;
}
.site-logo{
  width:156px;
  height:auto;
}

.site-nav{
  display:flex;
  align-items:center;
  gap:22px;
  margin-left:auto;
  white-space:nowrap;
}
.site-nav a{
  position:relative;
  padding:31px 0 28px;
  color:#333942;
  font-size:13px;
  font-weight:700;
  letter-spacing:.01em;
}
.site-nav a:after{
  content:"";
  position:absolute;
  left:50%;
  bottom:18px;
  width:0;
  height:2px;
  background:var(--accent);
  transform:translateX(-50%);
  transition:width .18s ease;
}
.site-nav a:hover{color:var(--brand)}
.site-nav a:hover:after{width:22px}

.header-contact{
  display:flex;
  align-items:stretch;
  flex:0 0 auto;
  border-left:1px solid #e6e8ec;
}
.header-phone{
  display:flex;
  flex-direction:column;
  justify-content:center;
  min-width:126px;
  padding:0 13px;
  border-right:1px solid #e6e8ec;
  line-height:1.2;
  transition:background .18s ease;
}
.header-phone:hover{background:#f7f8fb}
.header-phone span{
  margin-bottom:5px;
  color:#777f88;
  font-size:10px;
  font-weight:700;
  letter-spacing:.05em;
}
.header-phone strong{
  color:var(--brand-dark);
  font-size:14px;
  font-weight:800;
  letter-spacing:.015em;
}
.header-contact-btn{
  display:flex !important;
  align-items:center;
  justify-content:center;
  min-width:142px;
  height:48px;
  margin-left:10px;
  padding:0 20px;
  color:#fff !important;
  background:var(--brand);
  border:1px solid var(--brand);
  border-radius:2px;
  box-shadow:0 4px 12px rgba(32,37,138,.16);
  font-size:14px;
  font-weight:800;
  letter-spacing:.025em;
  white-space:nowrap;
  transition:background .18s ease,transform .18s ease,box-shadow .18s ease;
}
.header-contact-btn:hover{
  background:var(--brand-dark);
  transform:translateY(-1px);
  box-shadow:0 6px 15px rgba(32,37,138,.22);
}

.site-mobile-nav{display:none}

/* breadcrumb */
.breadcrumb{
  position:relative;
  z-index:5;
  background:#fff;
  border-bottom:1px solid #eceef1;
}
.breadcrumb-inner{
  min-height:42px;
  display:flex;
  align-items:center;
  gap:9px;
  color:#8a9199;
  font-size:11px;
}
.breadcrumb a{color:#59636d}
.breadcrumb a:hover{color:var(--brand)}
.breadcrumb span[aria-current="page"]{
  color:#727a82;
  white-space:nowrap;
  overflow:hidden;
  text-overflow:ellipsis;
}

/* Make anchored sections land cleanly below the fixed header */
#about,#services,#case,#records,#faq,#contact{scroll-margin-top:112px}

/* A little more structure near the hero after adding the breadcrumb */
.hero{border-bottom:1px solid rgba(255,255,255,.08)}
.hero-kicker{
  display:inline-flex;
  align-items:center;
  padding:6px 9px;
  border:1px solid rgba(255,255,255,.28);
  background:rgba(15,20,38,.18);
}
.hero-kicker:before{display:none}

/* improve image fallback appearance */
.case-thumb img[data-fallback-src]{background:#eef0f3}

/* desktop compact mode */
@media(max-width:1180px){
  .site-header-inner{gap:18px}
  .site-nav{gap:15px}
  .site-nav a{font-size:12px}
  .header-phone{min-width:116px;padding:0 10px}
  .header-phone strong{font-size:13px}
  .header-contact-btn{min-width:126px;height:44px;margin-left:6px;padding:0 14px;font-size:13px}
}

@media(max-width:980px){
  :root{
    --header-h:66px;
    --mobile-nav-h:42px;
  }
  html{scroll-padding-top:124px}
  body{padding-top:calc(var(--header-h) + var(--mobile-nav-h))}
  #about,#services,#case,#records,#faq,#contact{scroll-margin-top:124px}

  .site-header-main{height:var(--header-h)}
  .site-logo{width:142px}
  .site-nav{display:none}
  .site-header-inner{justify-content:space-between}
  .header-contact{
    margin-left:auto;
    border-left:0;
  }
  .header-phone{
    min-width:auto;
    padding:0 10px;
  }
  .header-phone span{font-size:9px}
  .header-phone strong{font-size:12px}
  .header-contact-btn{
    display:flex !important;
    min-width:118px;
    height:40px;
    margin-left:6px;
    padding:0 13px;
    font-size:12px;
  }

  .site-mobile-nav{
    display:block;
    height:var(--mobile-nav-h);
    border-top:1px solid #eceef1;
    background:#fff;
    overflow:hidden;
  }
  .site-mobile-nav-inner{
    height:100%;
    display:flex;
    align-items:center;
    gap:0;
    overflow-x:auto;
    scrollbar-width:none;
  }
  .site-mobile-nav-inner::-webkit-scrollbar{display:none}
  .site-mobile-nav a{
    flex:0 0 auto;
    padding:11px 16px 10px;
    border-right:1px solid #eceef1;
    color:#4e5660;
    font-size:11px;
    font-weight:700;
    white-space:nowrap;
  }
}

@media(max-width:640px){
  :root{
    --header-h:62px;
    --mobile-nav-h:40px;
  }
  html{scroll-padding-top:116px}
  body{padding-top:calc(var(--header-h) + var(--mobile-nav-h))}
  #about,#services,#case,#records,#faq,#contact{scroll-margin-top:116px}

  .site-header-inner{gap:8px}
  .site-logo-link{min-width:0;flex:1 1 auto}
  .site-logo{width:122px}
  .header-contact{
    display:flex !important;
    flex:0 0 auto;
    margin-left:auto;
  }
  .header-phone{display:none !important}
  .header-contact-btn{
    display:flex !important;
    visibility:visible !important;
    opacity:1 !important;
    min-width:112px;
    height:40px;
    margin-left:0;
    align-self:center;
    padding:0 12px;
    border-radius:2px;
    font-size:12px;
    box-shadow:none;
  }
  .site-mobile-nav a{padding-inline:14px}
  .breadcrumb-inner{min-height:38px;font-size:10px}
}

@media(max-width:380px){
  .site-logo{width:108px}
  .header-contact-btn{
    min-width:104px;
    height:38px;
    padding:0 9px;
    font-size:11.5px;
  }
}


/* =========================================================
   Global STEP nav + local INTEX page nav
   ========================================================= */
.site-nav a{
  letter-spacing:.015em;
}
.site-nav a[href*="/rental/"],
.site-nav a[href*="/event_type/"],
.site-nav a[href*="/tennzizirei/"]{
  font-weight:800;
}

.page-nav{
  position:relative;
  z-index:6;
  background:#fff;
  border-bottom:1px solid var(--line);
}
.page-nav-inner{
  display:grid;
  grid-template-columns:repeat(6,1fr);
  min-height:64px;
}
.page-nav a{
  position:relative;
  display:flex;
  flex-direction:column;
  justify-content:center;
  min-width:0;
  padding:10px 16px 9px;
  border-right:1px solid var(--line);
  color:#333942;
  font-size:12px;
  font-weight:800;
  text-align:center;
  transition:background .18s ease,color .18s ease;
}
.page-nav a:first-child{border-left:1px solid var(--line)}
.page-nav a span{
  display:block;
  margin-bottom:2px;
  color:#949ba3;
  font-size:9px;
  font-weight:800;
  letter-spacing:.13em;
}
.page-nav a:after{
  content:"";
  position:absolute;
  left:50%;
  bottom:-1px;
  width:0;
  height:3px;
  background:var(--brand);
  transform:translateX(-50%);
  transition:width .18s ease;
}
.page-nav a:hover{
  color:var(--brand);
  background:#f8f9fb;
}
.page-nav a:hover:after{width:42px}

@media(max-width:1180px){
  .site-nav{gap:13px}
  .site-nav a{font-size:11.5px}
}

@media(max-width:980px){
  .page-nav-inner{
    display:flex;
    min-height:52px;
    overflow-x:auto;
    scrollbar-width:none;
  }
  .page-nav-inner::-webkit-scrollbar{display:none}
  .page-nav a{
    flex:0 0 auto;
    min-width:116px;
    padding:8px 14px 7px;
    font-size:11px;
  }
  .page-nav a span{font-size:8px}
}

@media(max-width:640px){
  .page-nav-inner{min-height:48px}
  .page-nav a{
    min-width:104px;
    padding:7px 12px 6px;
    font-size:10.5px;
  }
}



/* =========================================================
   Back to top button
   ========================================================= */
.back-to-top{
  position:fixed;
  z-index:950;
  right:24px;
  bottom:24px;
  width:50px;
  height:50px;
  display:flex;
  align-items:center;
  justify-content:center;
  border:1px solid rgba(32,37,138,.16);
  border-radius:50%;
  color:#fff;
  background:var(--brand);
  box-shadow:0 8px 22px rgba(23,27,97,.22);
  opacity:0;
  visibility:hidden;
  transform:translateY(10px);
  transition:opacity .2s ease,visibility .2s ease,transform .2s ease,background .2s ease;
}
.back-to-top:before{
  content:"";
  width:11px;
  height:11px;
  border-top:2px solid currentColor;
  border-left:2px solid currentColor;
  transform:rotate(45deg) translate(2px,2px);
}
.back-to-top:hover{background:var(--brand-dark)}
.back-to-top.is-visible{
  opacity:1;
  visibility:visible;
  transform:translateY(0);
}

@media(max-width:640px){
  .back-to-top{
    right:14px;
    bottom:14px;
    width:46px;
    height:46px;
  }
}