:root{
  --ink:#16202e;          /* 深いネイビー（伝統） */
  --ink-soft:#26344a;
  --concrete:#f4f2ec;     /* コンクリート調オフホワイト */
  --paper:#ffffff;
  --line:#d9d5cb;
  --brass:#03115e;        /* 真鍮アクセント */
  --brass-soft:#c9a85f;
  --accent:var(--brass);
  --accent-d:#6f8cc0;
  --cream:#f8f4e8;
  --gray:#5d6571;
  --font-en:"Oswald",sans-serif;
  --text:#1d2733;
  --text-mute:#5d6571;
  --maxw:1180px;
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}

/* ===== セクション単位のスクロールスナップ（TOPページのみ） ===== */
body:has(#top){scroll-snap-type:y proximity}
body:has(#top) .hero{scroll-snap-align:start}
body:has(#top) #about,
body:has(#top) .works,
body:has(#top) .news,
body:has(#top) .promo{
  scroll-snap-align:start;
  scroll-margin-top:84px;
}

body{
  font-family:"Noto Sans JP",sans-serif;
  color:var(--text);
  background:var(--paper);
  line-height:1.8;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}

a{color:inherit;text-decoration:none}
img{display:block;max-width:100%}
ul{list-style:none}

.en{font-family:"Oswald",sans-serif;letter-spacing:.18em;font-weight:400}
.serif{font-family:"Noto Serif JP",serif}

.wrap{max-width:var(--maxw);margin:0 auto;padding:0 24px}
.container{max-width:var(--maxw);margin:0 auto;padding:0 24px}

/* ===== セクション見出し・共通レイアウト ===== */
.section{padding:96px 0}

.sec-head{margin-bottom:54px}
.sec-head__en{
  font-family:var(--font-en);font-weight:600;letter-spacing:.12em;
  color:var(--accent);font-size:14px;
}
.sec-head__jp{
  font-size:30px;font-weight:900;color:var(--ink);margin-top:6px;
  position:relative;padding-bottom:18px;
}
.sec-head__jp::after{
  content:"";position:absolute;left:0;bottom:0;
  width:48px;height:3px;background:var(--ink);
}

/* ===== ヘッダー ===== */
/* #header はサイト共通のナビゲーションバー。ページ内の <header class="sec-head"> と
   タグ名が重複するため、id セレクタで確実に区別する。 */
#header{
  position:fixed;top:0;left:0;width:100%;z-index:100;
  background:rgba(26,52,97,1);
  transition:background .35s,box-shadow .35s;
}
#header.scrolled{
  background:rgba(26,52,97,.82);
  backdrop-filter:blur(8px);
}
.nav{
  display:flex;align-items:center;justify-content:space-between;
  height:84px;max-width:1320px;margin:0 auto;padding:0 28px;
}
.logo{display:flex;flex-direction:row;align-items:center;gap:10px;line-height:1.1}
.logo-icon{height: 45px;px;width:auto;display:block}
.logo .mark{
  font-family:"Noto Serif JP",serif;font-weight:600;
  font-size:22px;color:#fff;letter-spacing:.06em;transition:color .35s;
}
#header.scrolled .logo .mark{color:#fff}

.gnav{display:flex;align-items:center;gap:30px}
.gnav .menu{display:flex;gap:28px}
.gnav .menu a{
  font-size:14px;color:#fff;font-weight:500;letter-spacing:.04em;
  position:relative;transition:color .35s;
}
#header.scrolled .gnav .menu a{color:#fff}
.gnav .menu a::after{
  content:"";position:absolute;left:0;bottom:-6px;width:0;height:1px;
  background:#fff;transition:width .3s;
}
.gnav .menu a:hover::after{width:100%}

.nav-cta{display:flex;gap:10px}
.nav-cta a{
  font-size:13px;font-weight:500;padding:11px 20px;letter-spacing:.04em;
}
.nav-cta .recruit{
  color:#fff;border:1px solid rgba(255,255,255,.5);
  transition:.3s;
}
#header.scrolled .nav-cta .recruit{color:#fff;border-color:rgba(255,255,255,.5)}
.nav-cta .recruit:hover{background:var(--ink);color:#fff;border-color:var(--ink)}
.nav-cta .contact{background:var(--brass);color:#fff;transition:.3s}
.nav-cta .contact:hover{background:var(--ink)}

.burger{display:none;flex-direction:column;gap:5px;cursor:pointer;background:none;border:0}
.burger span{width:26px;height:2px;background:#fff;transition:.3s}
#header.scrolled .burger span{background:#fff}

/* モバイルメニュー */
.m-menu{display:none}

/* ===== ボタン ===== */
.btn{
  display:inline-flex;align-items:center;gap:14px;
  font-family:"Oswald",sans-serif;font-size:14px;letter-spacing:.2em;
  color:var(--ink);padding:14px 0;border-bottom:1px solid var(--ink);transition:.3s;
}
.btn .arrow{width:34px;height:1px;background:var(--ink);position:relative;transition:.3s}
.btn .arrow::after{content:"";position:absolute;right:0;top:-3px;width:7px;height:7px;border-top:1px solid var(--ink);border-right:1px solid var(--ink);transform:rotate(45deg)}
.btn:hover{color:var(--brass);border-color:var(--brass);transform:scale(1.04)}
.btn:hover .arrow{background:var(--brass);width:44px}
.btn:hover .arrow::after{border-color:var(--brass)}

/* NEWSセクション内のボタン（一覧・記事詳細で共通） */
.news .btn{color:var(--ink);border-color:rgba(0,0,0,.3)}
.news .btn .arrow{background:var(--ink)}
.news .btn .arrow::after{border-color:var(--ink)}
.news .btn:hover{color:var(--brass);border-color:var(--brass);transform:scale(1.04)}
.news .btn:hover .arrow{background:var(--brass)}
.news .btn:hover .arrow::after{border-color:var(--brass)}

/* ===== スクロール演出 ===== */
.reveal{
  opacity:0;transform:translateY(20px);
  transition:opacity .9s cubic-bezier(.22,1,.36,1),transform .9s cubic-bezier(.22,1,.36,1);
}
.reveal.in{opacity:1;transform:none}

/* ===== カード（施工事例の写真＋本文レイアウト） ===== */
.about-grid{display:grid;grid-template-columns:1fr 1fr;gap:64px;align-items:center}
.about-img{position:relative;aspect-ratio:4/3;overflow:hidden}
/* TOPページの「私たちについて」のみ：見出し→画像→本文の順に個別配置 */
#about .about-grid{
  grid-template-areas:"img head" "img body";
  column-gap:64px;row-gap:54px;
}
#about .about-head{grid-area:head}
#about .about-head .sec-head{margin-bottom:0}
#about .about-img{grid-area:img}
#about .about-body{grid-area:body}
.about-photo{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.about-img .frame{position:absolute;inset:14px;border:1px solid rgba(255,255,255,.5);z-index:1}
.about-body p{font-size:15px;line-height:2.3;color:var(--text-mute)}
.about-body p strong{color:var(--ink);font-weight:500}

/* ===== 施工実績カード（TOP・施工実績一覧で共通） ===== */
.works-top{display:flex;justify-content:space-between;align-items:flex-end;margin-bottom:48px}
.works-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:28px}
.work-card{cursor:pointer}
.work-thumb{position:relative;aspect-ratio:3/2;overflow:hidden;background:#c4c0b6}
.work-thumb img{
  width:100%;height:100%;object-fit:cover;display:block;
  transition:transform .5s cubic-bezier(.22,1,.36,1);
}
.work-card:hover .work-thumb img{transform:scale(1.04)}
.work-thumb .ph{
  position:absolute;inset:0;display:flex;align-items:center;justify-content:center;
  font-family:"Oswald",sans-serif;letter-spacing:.25em;color:rgba(255,255,255,.75);font-size:13px;
  background:linear-gradient(135deg,#8b95a1,#5c6672);transition:transform .6s;
}
.work-card:hover .ph{transform:scale(1.06)}
.work-year{
  position:absolute;top:0;left:0;background:var(--ink);color:#fff;
  font-family:"Oswald",sans-serif;font-size:13px;letter-spacing:.1em;padding:6px 14px;z-index:2;
}
.work-meta{padding:18px 4px 0}
.work-cat{font-size:12px;color:var(--brass);letter-spacing:.1em;margin-bottom:6px}
.work-title{font-family:"Noto Serif JP",serif;font-size:17px;color:var(--ink);font-weight:500;transition:color .3s}
.work-card:hover .work-title{color:var(--brass)}

/* ===== お知らせリスト（TOP・お知らせ一覧で共通） ===== */
.news-list li a{
  display:grid;grid-template-columns:140px 100px 1fr;gap:24px;align-items:center;
  padding:24px 8px;border-bottom:1px solid rgba(0,0,0,.12);transition:.3s;
}
.news-list li a:hover{background:rgba(0,0,0,.03);padding-left:18px}
.news-date{font-family:"Oswald",sans-serif;letter-spacing:.08em;color:var(--text-mute);font-size:14px}
.news-cat{
  font-size:11px;text-align:center;border:1px solid var(--brass);color:var(--brass);
  padding:4px 0;letter-spacing:.08em;
}
.news-text{font-size:15px;color:var(--text)}

/* ===== RECRUIT / CONTACT 2カラム（全ページ共通フッター前バナー） ===== */
.promo{display:grid;grid-template-columns:1fr 1fr}
.promo-cell{
  position:relative;min-height:420px;display:flex;align-items:center;justify-content:center;
  text-align:center;color:#fff;overflow:hidden;
}
.promo-image{
  position:absolute;inset:0;width:100%;height:100%;object-fit:cover;object-position:center;
  z-index:0;transition:transform .7s;
}
.promo-cell:hover .promo-image{transform:scale(1.05)}
.promo-cell .bg{
  position:absolute;inset:0;z-index:1;
  background:linear-gradient(rgba(12,18,28,.5),rgba(12,18,28,.5));
}
.promo-cell .bg::after{content:"";position:absolute;inset:0;background:rgba(10,14,20,.35)}
.promo-inner{position:relative;z-index:2;padding:30px}
.promo-inner .en{display:block;font-family:"Noto Sans JP",sans-serif;font-size:30px;letter-spacing:.2em;margin-bottom:10px;font-weight:900}
.promo-inner .ja{font-family:"Noto Serif JP",serif;font-size:16px;letter-spacing:.1em;margin-bottom:26px}
.promo-inner .lead{font-size:13px;color:rgba(255,255,255,.8);max-width:340px;margin:0 auto 26px;line-height:2}
.promo-btn{
  display:inline-flex;align-items:center;gap:12px;font-family:"Oswald",sans-serif;
  font-size:13px;letter-spacing:.2em;border:1px solid rgba(255,255,255,.6);padding:13px 30px;transition:.3s;
}
.promo-btn:hover{background:#fff;color:var(--ink)}

/* ===== フッター ===== */
footer{background:linear-gradient(135deg,#071427 0%,#13345f 40%,#1e4b77 70%,#0b1630 100%);color:rgba(255,255,255,.75);padding:80px 0 30px}
.foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:48px;margin-bottom:56px}
.foot-brand .mark{font-family:"Noto Serif JP",serif;font-size:24px;color:#fff;letter-spacing:.06em}
.foot-brand .en{display:block;font-size:10px;letter-spacing:.34em;color:var(--brass-soft);margin:6px 0 24px}
.foot-brand address{font-style:normal;font-size:13px;line-height:2.1}
.foot-brand .tel{font-family:"Oswald",sans-serif;font-size:15px;color:#fff;margin-top:14px;letter-spacing:.05em}
.foot-col h4{font-size:12px;letter-spacing:.2em;color:var(--brass-soft);margin-bottom:20px;font-family:"Oswald",sans-serif}
.foot-col li{margin-bottom:13px}
.foot-col li a{font-size:13px;transition:.3s}
.foot-col li a:hover{color:#fff;padding-left:6px}
.foot-bottom{
  display:flex;justify-content:center;align-items:center;
  border-top:1px solid rgba(255,255,255,.12);padding-top:26px;font-size:12px;
}
.foot-bottom .links{display:flex;gap:24px}
.pagetop{
  position:fixed;right:24px;bottom:24px;width:48px;height:48px;background:var(--brass);
  color:#fff;display:flex;align-items:center;justify-content:center;z-index:90;
  opacity:0;pointer-events:none;transition:.3s;
}
.pagetop.show{opacity:1;pointer-events:auto}
.pagetop:hover{background:var(--ink)}

/* ===== ページ見出し（私たちについて・お知らせ・お問い合わせ等の下層ページで共通） ===== */
.page-hero{
  background:var(--paper);
  color:var(--text);
  position:relative;overflow:hidden;
}
.page-hero__inner{
  display:flex;
  align-items:stretch;
  width:100%;
  min-height:540px;
}
.page-hero__left{
  flex:0 0 auto;
  width:min(40%, 580px);
  display:flex;
  flex-direction:column;
  justify-content:center;
  box-sizing:border-box;
  padding:170px 24px 40px 64px;
  position:relative;
  z-index:2;              /* 横線を右側の写真より手前に重ねて表示するため */
}
.page-hero__en{
  font-family:"Noto Sans JP",sans-serif;font-size:clamp(32px,4.2vw,50px);font-weight:800;
  letter-spacing:.02em;color:#00238b;margin:0 0 8px;line-height:1.1;
}
.page-hero__jp{font-size:16px;color:var(--ink);margin:0 0 20px;letter-spacing:.05em}
.page-hero__divider{
  width:calc(100% + 200px);   /* 右側の写真に少しかぶさるまで伸ばす */
  height:3px;
  background:var(--brass);   /* 青系のアクセントカラー */
  margin:0 0 22px;
}
.page-hero__right{
  flex:1 1 auto;
  position:relative;
  z-index:1;
  min-width:0;
}
.page-hero__image{
  position:absolute;inset:0;
  width:100%;height:100%;
  background-size:cover;background-position:center 65%;
  background-repeat:no-repeat;
}

.breadcrumb{margin-top:0}
.breadcrumb ol{display:flex;align-items:center;gap:8px;font-size:12px;color:var(--text-mute);list-style:none}
.breadcrumb li + li::before{content:"›";margin:0 2px;color:var(--text-mute)}
.breadcrumb a{color:var(--ink);font-weight:600;text-decoration:underline}
.breadcrumb a:hover{color:var(--ink)}

@media(max-width:960px){           /*タブレットサイズ：40:60の左右分割は維持したまま余白を調整*/
  .page-hero__inner{min-height:390px}
  .page-hero__left{padding:108px 20px 24px 24px}
  .page-hero__divider{width:calc(100% + 60px)}
}
@media(max-width:760px){
  .page-hero__left{padding-top:92px}
}
@media(max-width:640px){          /*スマホサイズ：写真をもう少し左まで広げる*/
  .page-hero__inner{min-height:390px}
  .page-hero__left{width:30%;padding:150px 12px 20px 16px;overflow:visible}
  .page-hero__en{font-size:44px;white-space:nowrap}   /* 見出しを大きくし、右の写真にはみ出して重なるように */
  .page-hero__jp{font-size:12px;margin:0 0 14px;white-space:nowrap}
  .page-hero__divider{width:calc(100% + 120px);margin:0 0 14px}
  .breadcrumb ol{font-size:10px;gap:5px;flex-wrap:wrap}
}

/* ===== レスポンシブ ===== */
@media(max-width:920px){
  .about-grid{grid-template-columns:1fr;gap:36px}
  #about .about-grid{
    grid-template-areas:"head" "img" "body";
    row-gap:36px;
  }
  .works-grid{grid-template-columns:repeat(1,1fr)}
  .foot-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:760px){
  .gnav .menu,.nav-cta{display:none}
  .burger{display:flex}
  .nav{height:68px}
  .about,.works,.news{padding:80px 0}
  .work-card{flex:0 0 100%}
  .promo{grid-template-columns:1fr}
  .news-list li a{display:flex;flex-wrap:wrap;align-items:center;gap:6px 10px;padding:18px 8px}
  .news-date{order:1}
  .news-cat{order:2;padding:3px 14px}
  .news-text{order:3;flex-basis:100%}
  .foot-grid{grid-template-columns:1fr 1fr;gap:24px 20px;align-items:start}
  .foot-brand{grid-column:1 / -1}
  .foot-bottom{flex-direction:column;gap:16px;text-align:center}

  /* モバイルメニュー */
  .m-menu{
    display:flex;
    position:fixed;inset:0;background:rgba(26,52,97,1);z-index:99;
    flex-direction:column;justify-content:center;padding:0 40px;
    transform:translateX(100%);transition:transform .4s;
  }
  .m-menu.open{transform:none}
  .m-menu a{color:#fff;font-size:18px;padding:16px 0;border-bottom:1px solid rgba(255,255,255,.18);font-family:"Noto Serif JP",serif}
  .m-menu .close{position:absolute;top:22px;right:28px;font-size:30px;color:#fff;background:none;border:0;cursor:pointer}
}
@media(max-width:560px){
  .section{padding:64px 0;}
  .sec-head__jp{font-size:25px;}
}

/* アクセシビリティ：モーション低減 */
@media(prefers-reduced-motion:reduce){
  *{transition:none !important;scroll-behavior:auto !important;}
  html{scroll-snap-type:none !important}
}