:root{
  --navy:#1c3a4b;
  --navy-deep:#122a37;
  --aqua:#3e8fa6;
  --aqua-light:#eaf4f6;
  --wood:#b9835f;
  --ivory:#faf8f4;
  --line:#dfe4e2;
  --text:#2c3a3d;
}
*{box-sizing:border-box;margin:0;padding:0;}
html{scroll-behavior:smooth;scroll-padding-top:64px;}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Hiragino Kaku Gothic ProN","Hiragino Sans","Yu Gothic",sans-serif;
  color:var(--text);
  background:var(--ivory);
  line-height:1.8;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
h1,h2,h3,.brand-jp{font-family:"Hiragino Mincho ProN","Yu Mincho",YuMincho,serif;}
img{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;}
.wrap{max-width:1080px;margin:0 auto;padding:0 20px;}

.straight-divider{width:100%;height:6px;background:var(--navy-deep);}

/* header（0727のヘッダーデザインを踏襲） */
header{
  position:sticky;
  top:0;
  z-index:100;
  background:#fff;
  border-bottom:1px solid var(--line);
}
.header-inner{
  max-width:1080px;
  margin:0 auto;
  padding:12px 18px;
  display:flex;
  align-items:center;
  justify-content:flex-start;
  gap:36px;
}
.logo-link{display:flex;align-items:center;gap:8px;}
.logo-link img{height:38px;width:auto;display:block;}
nav ul{
  list-style:none;
  display:flex;
  gap:26px;
}
nav a{
  font-size:12.5px;
  font-weight:700;
  letter-spacing:.06em;
  color:var(--navy-deep);
  position:relative;
  padding-bottom:4px;
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:2px;
}
nav a .jp{
  font-size:10px;
  font-weight:400;
  letter-spacing:.02em;
  color:#6d818c;
}

/* ▼ナビ：ハンバーガーメニュー(スマホ)は「お問い合わせ」、PCナビは「INSTAGRAM」を表示 */
.nav-mobile-only{display:list-item;}
.nav-pc-only{display:none;}

/* ▼PC表示のみ：ロゴ拡大・ナビ文字拡大・余白調整 */
@media(min-width:860px){
  .logo-link img{height:50px;}
  nav ul{gap:40px;}
  nav a{font-size:16px;}
  nav a .jp{font-size:12.5px;}
  .nav-mobile-only{display:none;}
  .nav-pc-only{display:list-item;}
}
nav a::after{
  content:"";
  position:absolute;
  left:0;bottom:0;
  width:0;height:2px;
  background:var(--aqua);
  transition:width .25s;
}
nav a:hover::after{width:100%;}

.menu-toggle{
  display:none;
  flex-direction:column;
  align-items:center;
  justify-content:center;
  gap:5px;
  width:44px;
  height:48px;
  margin-left:auto;
  background:none;
  border:none;
  cursor:pointer;
}
.menu-toggle .bar-wrap{
  display:flex;
  flex-direction:column;
  justify-content:center;
  gap:7px;
  width:100%;
  height:20px;
}
.menu-toggle .bar{
  display:block;
  width:100%;
  height:3px;
  background:var(--navy-deep);
  transition:transform .25s, opacity .25s;
}
.menu-toggle .menu-label{
  font-size:9px;
  font-weight:700;
  letter-spacing:.05em;
  color:var(--navy-deep);
  line-height:1;
}
.menu-toggle.open .bar-wrap .bar:nth-child(1){transform:translateY(10px) rotate(45deg);}
.menu-toggle.open .bar-wrap .bar:nth-child(2){opacity:0;}
.menu-toggle.open .bar-wrap .bar:nth-child(3){transform:translateY(-10px) rotate(-45deg);}

@media(max-width:859px){
  .menu-toggle{display:flex;}
  .header-inner{position:relative;}
  nav ul{
    display:none;
    position:absolute;
    top:100%;
    left:0;
    right:0;
    flex-direction:column;
    gap:0;
    background:#fff;
    border-bottom:1px solid var(--line);
    box-shadow:0 8px 16px rgba(0,0,0,.06);
  }
  nav ul.open{display:flex;}
  nav li{border-top:1px solid var(--line);}
  nav a{display:flex;flex-direction:row;align-items:baseline;gap:8px;padding:16px 18px;font-size:13px;}
  nav a .jp{font-size:11px;}
  nav a::after{display:none;}
}

/* hero */
.hero{
  position:relative;min-height:calc(100vh - 64px);min-height:calc(100svh - 64px);display:flex;align-items:center;
  color:#fff;overflow:hidden;
  -webkit-transform:translateZ(0);transform:translateZ(0);
}
.hero-bg{
  position:absolute;inset:0;width:100%;height:100%;overflow:hidden;
  -webkit-transform:translate3d(0,0,0);transform:translate3d(0,0,0);
  -webkit-backface-visibility:hidden;backface-visibility:hidden;
}
.hero-bg img{
  display:block;width:100%;height:100%;object-fit:cover;
  -webkit-transform:translate3d(0,0,0);transform:translate3d(0,0,0);
  -webkit-backface-visibility:hidden;backface-visibility:hidden;
}
.hero-bg::after{
  content:"";position:absolute;inset:0;
  background:linear-gradient(180deg,rgba(18,42,55,.35) 0%, rgba(18,42,55,.55) 55%, rgba(18,42,55,.92) 100%);
}
.hero-content{position:relative;z-index:2;padding:0 20px;width:100%;}
.eyebrow{
  font-size:12px;letter-spacing:.28em;color:var(--aqua-light);
  border-left:2px solid var(--aqua); padding-left:10px;margin-bottom:16px;
  display:inline-block;
}
.hero h1{
  font-size:clamp(26px,7vw,44px);font-weight:700;line-height:1.5;
  margin-bottom:14px;
}
.hero p{font-size:14px;color:#e7eef0;max-width:34em;margin-bottom:22px;}
.scroll-cue{
  display:flex;align-items:center;gap:8px;font-size:11px;letter-spacing:.15em;color:#cfe3e8;
}
.scroll-cue .line{width:26px;height:1px;background:#cfe3e8;animation:pulse 1.8s ease-in-out infinite;}
@keyframes pulse{0%,100%{opacity:.3}50%{opacity:1}}

/* section generic */
section{padding:64px 0;}
.section-head{margin-bottom:34px;text-align:center;}
.section-head .eyebrow-line{
  font-size:11px;letter-spacing:.3em;color:var(--aqua);margin-bottom:10px;
}
.section-head h2{font-size:clamp(22px,5.5vw,30px);color:var(--navy-deep);font-weight:700;}
.section-head .jp-sub{font-size:16px;color:#7b8a8d;margin-top:8px;}

/* swipeable case-study carousel */
.carousel{
  position:relative;
}
.carousel-track{
  display:flex;overflow-x:auto;scroll-snap-type:x mandatory;
  -webkit-overflow-scrolling:touch;gap:16px;
  padding:4px 20px 20px;margin:0 -20px;
  scrollbar-width:none;
  cursor:grab;
}
.carousel-track::-webkit-scrollbar{display:none;}
.carousel-track.dragging{cursor:grabbing;scroll-snap-type:none;user-select:none;}
.slide{
  flex:0 0 82%;scroll-snap-align:center;
  border-radius:16px;overflow:hidden;background:#fff;
  box-shadow:0 14px 30px -16px rgba(28,58,75,.35);
  border:none;padding:0;font:inherit;text-align:left;
  display:block;color:inherit;
}
.slide img{
  width:100%;aspect-ratio:4/3;object-fit:cover;display:block;
  pointer-events:none;-webkit-user-drag:none;-webkit-touch-callout:none;user-select:none;
}
.slide-cap{
  display:flex;flex-wrap:wrap;align-items:baseline;gap:10px;padding:14px 16px 16px;
}
.slide-cap .en{font-family:"Hiragino Mincho ProN","Yu Mincho",serif;font-size:17px;color:var(--navy-deep);letter-spacing:.03em;}
.slide-cap .jp{font-size:12px;color:#8a9799;}
.slide{cursor:pointer;-webkit-tap-highlight-color:transparent;touch-action:manipulation;}
.slide:focus-visible{outline:2px solid var(--aqua);outline-offset:2px;}
.detail-back:focus-visible{outline:2px solid var(--aqua);outline-offset:2px;}
.slide-btn{
  display:inline-flex;align-items:center;gap:4px;
  font-size:11.5px;letter-spacing:.05em;color:#fff;
  background:var(--aqua);padding:7px 14px;border-radius:20px;
  margin-top:8px;flex-basis:100%;width:fit-content;transition:background .2s ease;
}
.slide:hover .slide-btn,.slide:active .slide-btn{background:var(--navy-deep);}
.dots{display:flex;justify-content:center;gap:8px;margin-top:6px;}
.dot{width:7px;height:7px;border-radius:50%;background:#d7dedd;transition:background .25s ease, transform .25s ease;}
.dot.active{background:var(--aqua);transform:scale(1.3);}
.swipe-hint{text-align:center;font-size:11px;color:#a3aeaf;letter-spacing:.04em;margin-top:16px;display:flex;align-items:center;justify-content:center;gap:10px;}
.swipe-arrow{background:none;border:1px solid #d8dede;border-radius:50%;width:28px;height:28px;font-size:14px;line-height:1;color:#6b7676;cursor:pointer;display:inline-flex;align-items:center;justify-content:center;padding:0;transition:background .15s,color .15s;}
.swipe-arrow:hover{background:#f0f2f2;}
.swipe-arrow:active{background:#e2e6e6;color:#333;}

/* PC-only left/right carousel arrows */
.carousel-viewport{position:relative;}
.carousel-side-arrow{display:none;}

.cta-row{display:flex;justify-content:center;margin-top:30px;}

/* detail pages ("separate page" views within one file) */
.detail-page{display:none;padding:96px 0 60px;min-height:70vh;}
.detail-page:target{display:block;}
.detail-page.active{display:block;}
.detail-back{
  display:inline-flex;align-items:center;gap:6px;font-size:13px;color:var(--aqua);
  margin-bottom:26px;letter-spacing:.03em;
  background:none;border:none;padding:0;font-family:inherit;cursor:pointer;
}
.detail-back:hover{color:var(--navy-deep);}
.detail-eyebrow{font-size:11px;letter-spacing:.3em;color:var(--aqua);margin-bottom:8px;}
.detail-title{font-size:clamp(22px,6vw,30px);color:var(--navy-deep);margin-bottom:26px;}
.detail-title span{display:block;font-size:13px;font-family:-apple-system,BlinkMacSystemFont,"Hiragino Kaku Gothic ProN","Yu Gothic",sans-serif;color:#7b8a8d;margin-top:4px;letter-spacing:.05em;}
.detail-img{
  max-width:480px;margin:0 auto 28px;border-radius:16px;overflow:hidden;
  box-shadow:0 16px 34px -18px rgba(28,58,75,.4);
}

/* before / after comparison slider */
.ba-slider{
  position:relative;max-width:560px;margin:0 auto 28px;aspect-ratio:4/3;
  border-radius:16px;overflow:hidden;box-shadow:0 16px 34px -18px rgba(28,58,75,.4);
  cursor:ew-resize;user-select:none;touch-action:pan-y;
  background:var(--aqua-light);
}
.ba-img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;pointer-events:none;draggable:false;}
.ba-before-wrap{position:absolute;inset:0;overflow:hidden;clip-path:inset(0 50% 0 0);}
.ba-tag{
  position:absolute;top:12px;z-index:2;font-size:11px;letter-spacing:.08em;
  color:#fff;background:rgba(18,42,55,.55);padding:5px 12px;border-radius:20px;
  backdrop-filter:blur(2px);pointer-events:none;
}
.ba-tag-before{left:12px;}
.ba-tag-after{right:12px;}
.ba-divider{
  position:absolute;top:0;bottom:0;left:50%;width:0;
  background:#fff;box-shadow:0 0 0 1px rgba(28,58,75,.15);
  transform:translateX(-50%);z-index:3;pointer-events:none;
}
.ba-handle{
  position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);
  width:38px;height:38px;border-radius:50%;background:#fff;
  display:flex;align-items:center;justify-content:center;gap:2px;
  box-shadow:0 4px 12px -2px rgba(28,58,75,.5);
}
.detail-body{max-width:34em;margin:0 auto;font-size:14.5px;color:#4a5a5d;}
.detail-note{font-size:11.5px;color:#93a0a2;margin-top:16px;}
.detail-cta{display:flex;flex-wrap:wrap;gap:12px;justify-content:center;margin-top:30px;}
.btn-outline{
  border:1px solid var(--navy-deep);color:var(--navy-deep);
  padding:13px 30px;border-radius:30px;font-size:13px;letter-spacing:.08em;
  display:inline-flex;align-items:center;gap:8px;transition:.25s;
}
.btn-outline:hover{background:var(--navy-deep);color:#fff;}

/* site list (現場一覧: thumbnails only) */
.site-grid{
  display:grid;grid-template-columns:repeat(2,1fr);gap:14px;
  max-width:560px;margin:0 auto;
}
.site-thumb{
  border:none;padding:0;font:inherit;text-align:left;display:block;color:inherit;
  border-radius:14px;overflow:hidden;background:#fff;cursor:pointer;
  box-shadow:0 12px 26px -16px rgba(28,58,75,.4);
  -webkit-tap-highlight-color:transparent;touch-action:manipulation;
}
.site-thumb img{
  width:100%;aspect-ratio:4/3;object-fit:cover;display:block;
  pointer-events:none;-webkit-user-drag:none;-webkit-touch-callout:none;user-select:none;
}
.site-thumb-cap{
  display:block;padding:9px 12px;font-size:11.5px;letter-spacing:.08em;
  color:var(--navy-deep);font-weight:700;
}
.site-thumb:focus-visible{outline:2px solid var(--aqua);outline-offset:2px;}

/* about band */
.about{background:var(--navy-deep);color:#eef3f2;}
.about .section-head h2{color:#fff;}
.about .section-head .eyebrow-line{color:#8fd0e0;}
.about .section-head .jp-sub{color:#a9bcc0;}

.about-grid{
  display:grid;grid-template-columns:1fr;gap:34px;align-items:end;
}
.profile-table{width:100%;border-collapse:collapse;font-size:13.5px;}
.profile-table tr{border-top:1px solid rgba(255,255,255,.14);}
.profile-table tr:last-child{border-bottom:1px solid rgba(255,255,255,.14);}
.profile-table th{
  text-align:left;font-weight:500;color:#8fd0e0;
  padding:14px 14px 14px 0;width:34%;letter-spacing:.04em;vertical-align:top;
  font-size:12.5px;
}
.profile-table td{padding:14px 0;vertical-align:top;color:#f2f6f5;}

.office-photo-wrap{display:flex;justify-content:flex-end;}
.office-photo{
  border-radius:12px;overflow:hidden;max-width:340px;width:100%;
  box-shadow:0 18px 40px -16px rgba(0,0,0,.55);
  border:1px solid rgba(255,255,255,.12);
}
.office-photo img{width:100%;}
.office-cap{
  font-size:11px;color:#8fd0e0;letter-spacing:.1em;margin-top:10px;text-align:right;
}

/* instagram / contact strip */
.contact-strip{
  background:var(--aqua-light);text-align:center;padding:52px 0;
}
.contact-strip h3{font-size:18px;color:var(--navy-deep);margin-bottom:10px;}
.contact-strip p{font-size:13px;color:#5a6b6e;margin-bottom:22px;}
.btn-row{display:flex;flex-wrap:wrap;gap:14px;justify-content:center;}
.btn-solid{
  background:var(--navy-deep);color:#fff;padding:14px 26px;border-radius:30px;
  font-size:13px;letter-spacing:.06em;display:inline-flex;align-items:center;gap:8px;
  transition:.25s;
}
.btn-solid:hover{background:var(--aqua);}
.btn-solid.ig{background:linear-gradient(135deg,#5851d8,#c13584,#f77737);}

/* footer */
footer{background:var(--navy);color:#cdd9da;padding:40px 0 26px;font-size:12.5px;}
.foot-top{display:flex;flex-direction:column;gap:18px;margin-bottom:26px;}
.foot-logo-text{font-family:"Hiragino Mincho ProN","Yu Mincho",serif;font-size:16px;letter-spacing:.05em;color:#fff;}
.foot-links{display:flex;flex-wrap:wrap;gap:16px 22px;}
.foot-addr{line-height:1.9;color:#a9bcc0;}
.foot-bottom{border-top:1px solid rgba(255,255,255,.12);padding-top:18px;text-align:center;color:#8ea1a4;font-size:11.5px;}

@media(min-width:640px){
  .slide{flex:0 0 46%;}
}
@media(min-width:860px){
  .slide{flex:0 0 30%;}
  .about-grid{grid-template-columns:1.3fr 1fr;}

  /* PC only: left/right carousel arrows */
  .carousel-side-arrow{
    display:flex;align-items:center;justify-content:center;
    position:absolute;top:50%;transform:translateY(-50%);
    width:52px;height:52px;border-radius:50%;
    background:var(--aqua);border:2px solid var(--aqua);
    box-shadow:0 10px 24px -10px rgba(28,58,75,.55);
    color:#fff;font-size:22px;line-height:1;
    cursor:pointer;z-index:20;pointer-events:auto;padding:0;
    transition:background .12s ease,color .12s ease,box-shadow .12s ease,transform .12s ease;
  }
  .carousel-side-arrow:hover{background:var(--navy-deep);border-color:var(--navy-deep);box-shadow:0 12px 26px -8px rgba(28,58,75,.6);}
  .carousel-side-arrow:active{background:var(--navy-deep);border-color:var(--navy-deep);transform:translateY(-50%) scale(.92);}
  .carousel-side-arrow:focus-visible{outline:3px solid var(--aqua);outline-offset:2px;}
  .carousel-side-arrow--prev{left:-14px;}
  .carousel-side-arrow--next{right:-14px;}

  /* ▼PC表示のみ：本文まわりの文字サイズを拡大 */
  .eyebrow{font-size:14px;}
  .hero h1{font-size:clamp(30px,4.2vw,52px);}
  .hero p{font-size:17px;}
  .scroll-cue{font-size:12.5px;}
  .section-head .eyebrow-line{font-size:12.5px;}
  .section-head h2{font-size:clamp(26px,3.2vw,36px);}
  .section-head .jp-sub{font-size:16px;}
  .slide-cap .en{font-size:19px;}
  .slide-cap .jp{font-size:13.5px;}
  .badge{font-size:13px;}
  .swipe-hint{font-size:12.5px;}
  .swipe-hint{display:none;}
  .mobile-only-hint{display:none;}
  .pc-hide-br{display:none;}
  .swipe-arrow{font-size:15px;}
  .detail-back{font-size:14.5px;}
  .detail-eyebrow{font-size:12.5px;}
  .detail-title{font-size:clamp(26px,3.4vw,36px);}
  .detail-title span{font-size:14.5px;}
  .ba-tag{font-size:12.5px;}
  .detail-body{font-size:16.5px;}
  .detail-note{font-size:13px;}
  .btn-outline{font-size:14.5px;}
  .site-thumb-cap{font-size:13px;}
  .profile-table{font-size:15px;}
  .profile-table th{font-size:14px;}
  .office-cap{font-size:12.5px;}
  .contact-strip h3{font-size:24px;}
  .contact-strip p{font-size:16px;}
  .btn-solid{font-size:14.5px;}
  footer{font-size:14px;}
  .foot-logo-text{font-size:23px;}
  .foot-addr{font-size:15px;}
  .foot-bottom{font-size:13px;}
}