/* ===================================================================
   CULM BLEND ZONE — Shared Stylesheet
   竹素材・建築コンポーネント・インテリア資材コンサルティング
=================================================================== */

:root{
  --ivory:#F8F4EC;
  --beige:#EEE5D4;
  --beige-deep:#E3D5BE;
  --charcoal:#2B2A27;
  --charcoal-soft:#55524B;
  --green:#6E7C4C;
  --green-deep:#4F5A3A;
  --walnut:#7C5A3B;
  --walnut-deep:#5E4229;
  --sand:#EFE6D4;
  --line:#DCD2BC;
  --white:#FFFFFF;
  --shadow: 0 10px 30px rgba(43,42,39,0.08);
  --radius: 6px;
  --maxw: 1180px;
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  font-family:"Noto Sans JP","Hiragino Kaku Gothic ProN","Yu Gothic",sans-serif;
  background:var(--ivory);
  color:var(--charcoal);
  line-height:1.85;
  font-size:16px;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;}
ul{margin:0;padding:0;}
section{padding:72px 0;}
.container{max-width:var(--maxw);margin:0 auto;padding:0 24px;}

h1,h2,h3,h4,h2.as-h3,h3.as-h4{
  font-weight:700;
  letter-spacing:0.02em;
  color:var(--charcoal);
  margin:0 0 18px;
}
h1{font-size:clamp(28px,4vw,42px);line-height:1.4;}
h2{font-size:clamp(24px,3vw,32px);line-height:1.5;}
h3,
h2.as-h3{font-size:20px;}
h4,
h3.as-h4{font-size:17px;}
p{margin:0 0 16px;color:var(--charcoal-soft);}

.eyebrow{
  display:inline-block;
  font-size:13px;
  letter-spacing:0.12em;
  color:var(--green-deep);
  font-weight:700;
  margin-bottom:12px;
  border-bottom:2px solid var(--green);
  padding-bottom:4px;
}

.section-head{max-width:760px;margin:0 auto 44px;text-align:center;}
.section-head p{font-size:16px;}

/* ---------- Header ---------- */
.site-header{
  position:sticky;top:0;z-index:999;
  background:rgba(248,244,236,0.96);
  border-bottom:1px solid var(--line);
  backdrop-filter:blur(6px);
}
.header-inner{
  max-width:var(--maxw);margin:0 auto;padding:14px 24px;
  display:flex;align-items:center;justify-content:space-between;gap:24px;
}
.brand{display:flex;align-items:center;gap:10px;flex-shrink:0;}
.brand svg{width:38px;height:38px;flex-shrink:0;}
.brand-name{font-size:16px;font-weight:700;letter-spacing:0.06em;color:var(--charcoal);white-space:nowrap;}
.brand-name small{display:block;font-size:10px;font-weight:400;letter-spacing:0.08em;color:var(--charcoal-soft);}

.main-nav{display:flex;align-items:center;gap:4px;flex-wrap:wrap;}
.main-nav a{
  font-size:13.5px;padding:10px 12px;border-radius:4px;color:var(--charcoal-soft);
  white-space:nowrap;transition:background .15s,color .15s;
}
.main-nav a:hover,.main-nav a.active{background:var(--beige);color:var(--green-deep);}
.nav-cta{
  background:var(--green-deep)!important;color:#fff!important;padding:10px 18px!important;
  border-radius:4px;margin-left:6px;
}
.nav-cta:hover{background:var(--walnut-deep)!important;color:#fff!important;}

.nav-toggle{display:none;background:none;border:1px solid var(--line);border-radius:4px;padding:8px 10px;cursor:pointer;}
.nav-toggle span{display:block;width:20px;height:2px;background:var(--charcoal);margin:4px 0;}

@media (max-width:1080px){
  .main-nav{
    display:none;position:absolute;top:100%;left:0;right:0;background:var(--ivory);
    flex-direction:column;align-items:stretch;border-bottom:1px solid var(--line);
    box-shadow:var(--shadow);padding:10px 16px 18px;gap:2px;
  }
  .main-nav.open{display:flex;}
  .main-nav a{padding:12px 10px;}
  .nav-cta{margin-left:0;text-align:center;margin-top:8px;}
  .nav-toggle{display:block;}
}

/* ---------- Hero ---------- */
.hero{
  position:relative;padding:0;overflow:hidden;background:var(--charcoal);
  min-height:520px;display:flex;align-items:center;
}
.hero-media{position:absolute;inset:0;}
.hero-media img{width:100%;height:100%;object-fit:cover;opacity:0.55;}
.hero-media::after{content:"";position:absolute;inset:0;
  background:linear-gradient(100deg,rgba(32,31,27,0.92) 0%, rgba(32,31,27,0.55) 55%, rgba(32,31,27,0.25) 100%);
}
.hero-content{position:relative;z-index:2;max-width:var(--maxw);margin:0 auto;padding:110px 24px 90px;color:#fff;}
.hero-content .eyebrow{color:#C9D3A6;border-color:#C9D3A6;}
.hero-content h1{color:#fff;max-width:720px;}
.hero-content p{color:#E7E2D4;max-width:560px;font-size:17px;}
.hero-actions{display:flex;gap:14px;margin-top:30px;flex-wrap:wrap;}

/* page header (non-home hero banner) */
.page-banner{
  position:relative;background:var(--charcoal);color:#fff;overflow:hidden;
}
.page-banner img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:0.4;}
.page-banner::after{content:"";position:absolute;inset:0;background:linear-gradient(100deg,rgba(32,31,27,0.9),rgba(32,31,27,0.5));}
.page-banner-inner{position:relative;z-index:2;max-width:var(--maxw);margin:0 auto;padding:68px 24px 56px;}
.page-banner-inner .eyebrow{color:#C9D3A6;border-color:#C9D3A6;}
.page-banner-inner h1{color:#fff;margin-bottom:10px;}
.page-banner-inner p{color:#E7E2D4;max-width:640px;margin-bottom:0;}
.breadcrumb{position:relative;z-index:2;max-width:var(--maxw);margin:0 auto;padding:14px 24px 0;font-size:13px;color:#C9C4B6;}
.breadcrumb a{color:#C9D3A6;}

/* ---------- Buttons ---------- */
.btn{
  display:inline-block;padding:13px 26px;border-radius:4px;font-size:14.5px;font-weight:700;
  letter-spacing:0.03em;cursor:pointer;border:1px solid transparent;transition:all .15s;
}
.btn-primary{background:var(--green-deep);color:#fff;}
.btn-primary:hover{background:var(--olive,#3f4830);background:#3f4830;}
.btn-outline{background:transparent;color:#fff;border-color:rgba(255,255,255,0.6);}
.btn-outline:hover{background:rgba(255,255,255,0.12);}
.btn-outline-dark{background:transparent;color:var(--charcoal);border-color:var(--charcoal);}
.btn-outline-dark:hover{background:var(--charcoal);color:#fff;}
.btn-walnut{background:var(--walnut);color:#fff;}
.btn-walnut:hover{background:var(--walnut-deep);}
.btn-block{display:block;width:100%;text-align:center;}
.btn:disabled{opacity:0.55;cursor:not-allowed;}

/* ---------- Cards / Grids ---------- */
.grid{display:grid;gap:28px;}
.grid-2{grid-template-columns:repeat(2,1fr);}
.grid-3{grid-template-columns:repeat(3,1fr);}
.grid-4{grid-template-columns:repeat(4,1fr);}
@media (max-width:900px){.grid-2,.grid-3,.grid-4{grid-template-columns:1fr 1fr;}}
@media (max-width:620px){.grid-2,.grid-3,.grid-4{grid-template-columns:1fr;}}

.card{
  background:var(--white);border:1px solid var(--line);border-radius:var(--radius);
  padding:30px;box-shadow:var(--shadow);
}
.card h3,
.card h2.as-h3{margin-bottom:10px;}
.card .tag{
  display:inline-block;font-size:11.5px;letter-spacing:0.08em;color:var(--green-deep);
  background:var(--sand);padding:4px 10px;border-radius:30px;margin-bottom:14px;font-weight:700;
}

.img-card{background:var(--white);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);}
.img-card img{width:100%;height:220px;object-fit:cover;}
.img-card .img-card-body{padding:24px;}

.alt{background:var(--beige);}
.alt-olive{background:var(--green-deep);color:#fff;}
.alt-olive h2,.alt-olive h3,.alt-olive h2.as-h3{color:#fff;}
.alt-olive p{color:#E3E6D9;}

/* ---------- Tables ---------- */
.spec-table{width:100%;border-collapse:collapse;margin:18px 0 28px;font-size:14.5px;}
.spec-table th,.spec-table td{text-align:left;padding:12px 16px;border-bottom:1px solid var(--line);}
.spec-table th{background:var(--beige);font-weight:700;width:30%;color:var(--charcoal);}
.spec-table td{color:var(--charcoal-soft);}
.table-wrap{overflow-x:auto;border-radius:var(--radius);border:1px solid var(--line);}
.table-wrap .spec-table{margin:0;}
.table-wrap .spec-table th,.table-wrap .spec-table td{border-bottom:1px solid var(--line);}

/* ---------- Material / Service detail blocks ---------- */
.detail-block{padding:56px 0;border-bottom:1px solid var(--line);}
.detail-block:last-of-type{border-bottom:none;}
.detail-grid{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:start;}
@media (max-width:860px){.detail-grid{grid-template-columns:1fr;}}
.detail-grid img{border-radius:var(--radius);box-shadow:var(--shadow);width:100%;object-fit:cover;height:320px;}
.chiplist{display:flex;flex-wrap:wrap;gap:8px;margin:14px 0 6px;}
.chip{background:var(--beige);border:1px solid var(--line);font-size:12.5px;padding:6px 12px;border-radius:30px;color:var(--charcoal-soft);}

/* numbered process */
.process-list{display:grid;gap:22px;}
.process-step{display:grid;grid-template-columns:70px 1fr;gap:22px;background:var(--white);border:1px solid var(--line);border-radius:var(--radius);padding:26px 28px;box-shadow:var(--shadow);}
.process-step .num{font-size:28px;font-weight:700;color:var(--green);font-family:Georgia,serif;}
@media (max-width:620px){.process-step{grid-template-columns:1fr;}}

/* steps horizontal mini */
.mini-steps{display:flex;flex-wrap:wrap;gap:10px;margin:16px 0 28px;}
.mini-steps span{background:var(--sand);border-radius:30px;padding:8px 16px;font-size:13px;color:var(--green-deep);font-weight:700;}
.mini-steps span:not(:last-child)::after{content:" →";margin-left:10px;color:var(--charcoal-soft);font-weight:400;}

/* ---------- Forms ---------- */
.form-card{background:var(--white);border:1px solid var(--line);border-radius:var(--radius);padding:40px;box-shadow:var(--shadow);}
.form-row{margin-bottom:20px;}
.form-row label{display:block;font-size:14px;font-weight:700;margin-bottom:8px;color:var(--charcoal);}
.form-row label .opt{font-weight:400;color:var(--charcoal-soft);font-size:12.5px;}
.form-row input,.form-row select,.form-row textarea{
  width:100%;padding:12px 14px;border:1px solid var(--line);border-radius:4px;background:var(--ivory);
  font-family:inherit;font-size:14.5px;color:var(--charcoal);
}
.form-row input:focus,.form-row select:focus,.form-row textarea:focus{outline:2px solid var(--green);outline-offset:1px;background:#fff;}
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:0 24px;}
@media (max-width:620px){.form-grid{grid-template-columns:1fr;}}
.form-row.full{grid-column:1/-1;}
.checkbox-row{display:flex;gap:10px;align-items:flex-start;font-size:13.5px;color:var(--charcoal-soft);margin:22px 0;}
.checkbox-row input{width:auto;margin-top:3px;}
.form-note{font-size:12.5px;color:var(--charcoal-soft);margin-top:-6px;margin-bottom:16px;}
.form-status{display:none;margin-top:18px;padding:14px 16px;border-radius:4px;font-size:14px;}
.form-status.show{display:block;}
.form-status.ok{background:#EAF0E1;color:var(--green-deep);border:1px solid var(--green);}
.form-status.err{background:#F6E6E0;color:#7A3A22;border:1px solid #C06A3F;}
fieldset{border:1px solid var(--line);border-radius:var(--radius);padding:24px;margin-bottom:28px;}
fieldset legend{font-weight:700;padding:0 8px;color:var(--green-deep);font-size:14px;}

/* ---------- Article ---------- */
.article-body{max-width:760px;margin:0 auto;}
.article-body h2{margin-top:44px;}
.article-body h3,
.article-body h2.as-h3{margin-top:30px;}
.article-body img{border-radius:var(--radius);margin:28px 0;box-shadow:var(--shadow);}
.article-meta{display:flex;gap:14px;align-items:center;font-size:13px;color:var(--charcoal-soft);margin-bottom:6px;flex-wrap:wrap;}
.article-meta .cat{background:var(--sand);color:var(--green-deep);padding:4px 12px;border-radius:30px;font-weight:700;}
.pull-note{background:var(--beige);border-left:4px solid var(--green);padding:18px 22px;border-radius:4px;margin:26px 0;font-size:14.5px;color:var(--charcoal);}

/* insight cards */
.insight-card{background:var(--white);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);display:flex;flex-direction:column;}
.insight-card img{width:100%;height:190px;object-fit:cover;}
.insight-card .body{padding:22px;flex:1;display:flex;flex-direction:column;}
.insight-card .cat{font-size:11.5px;color:var(--green-deep);font-weight:700;letter-spacing:.06em;margin-bottom:8px;}
.insight-card h3,
.insight-card h2.as-h3{font-size:17px;margin-bottom:10px;}
.insight-card p{font-size:14px;flex:1;}
.insight-card .readmore{font-size:13px;font-weight:700;color:var(--walnut);margin-top:10px;}

/* category pills */
.cat-pills{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:40px;}
.cat-pills a{background:var(--white);border:1px solid var(--line);padding:8px 16px;border-radius:30px;font-size:13px;color:var(--charcoal-soft);}
.cat-pills a:hover{border-color:var(--green);color:var(--green-deep);}

/* faq / accordion-like challenge list */
.challenge{border:1px solid var(--line);border-radius:var(--radius);background:#fff;padding:26px 28px;margin-bottom:18px;box-shadow:var(--shadow);}
.challenge h3,
.challenge h2.as-h3{color:var(--walnut-deep);margin-bottom:8px;}

/* quote / cta banners */
.cta-banner{background:var(--green-deep);border-radius:var(--radius);padding:50px 44px;color:#fff;display:flex;justify-content:space-between;align-items:center;gap:30px;flex-wrap:wrap;}
.cta-banner h2{color:#fff;margin-bottom:8px;}
.cta-banner p{color:#E3E6D9;margin-bottom:0;}

/* ---------- Footer ---------- */
.site-footer{background:#242320;color:#D8D3C4;padding:64px 0 0;}
.footer-top{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:40px;max-width:var(--maxw);margin:0 auto;padding:0 24px 40px;}
@media (max-width:900px){.footer-top{grid-template-columns:1fr 1fr;}}
@media (max-width:560px){.footer-top{grid-template-columns:1fr;}}
.footer-brand{display:flex;align-items:center;gap:10px;margin-bottom:16px;}
.footer-brand span{font-weight:700;color:#fff;letter-spacing:0.05em;font-size:15px;}
.footer-top p{color:#A9A496;font-size:13.5px;}
.site-footer h4,
.site-footer h3.as-h4{color:#fff;font-size:13px;letter-spacing:0.08em;margin-bottom:16px;}
.site-footer ul li{margin-bottom:10px;}
.site-footer a{color:#B9B4A6;font-size:13.5px;}
.site-footer a:hover{color:#fff;}
.footer-bottom{border-top:1px solid #39372F;padding:22px 24px;text-align:center;font-size:12.5px;color:#89857A;}
.footer-bottom a{color:#89857A;margin:0 8px;}

/* back to top / small util */
.skip-link{position:absolute;left:-999px;}
.text-center{text-align:center;}
.mt-0{margin-top:0;}
.small{font-size:13px;color:var(--charcoal-soft);}
.divider{height:1px;background:var(--line);margin:48px 0;}

/* legal page tabs */
.legal-tabs{display:flex;gap:10px;margin-bottom:30px;flex-wrap:wrap;position:sticky;top:78px;background:var(--ivory);padding:10px 0;z-index:5;}
.legal-tabs a{background:#fff;border:1px solid var(--line);padding:9px 16px;border-radius:30px;font-size:13.5px;}
.legal-tabs a:hover{border-color:var(--green);color:var(--green-deep);}
.legal-section{padding-top:30px;border-top:1px solid var(--line);margin-top:30px;}
.legal-section:first-child{border-top:none;margin-top:0;}
.legal-section h2{margin-top:0;}
.legal-section h3,
.legal-section h2.as-h3{margin-top:26px;}
.legal-section ol,.legal-section ul{padding-left:22px;color:var(--charcoal-soft);}
.legal-section li{margin-bottom:8px;}

/* 404 */
.notfound{min-height:60vh;display:flex;align-items:center;justify-content:center;text-align:center;}

/*as-h*/