/* ========================================
   博多みらい工務店 — Common Stylesheet
   Multi-page architecture with parallax & scroll-driven animation
   ======================================== */

:root{
  --ink:#0a0d12;
  --ink-2:#141821;
  --ink-3:#1c2230;
  --line:rgba(255,255,255,.08);
  --paper:#f4f1ea;
  --paper-dim:rgba(244,241,234,.7);
  --paper-sub:rgba(244,241,234,.55);
  --gold:#c9a05a;
  --gold-deep:#8e6a30;
  --gold-light:#e5cda0;
  --serif:"Cormorant Garamond","Noto Serif JP",serif;
  --sans:"Inter","Noto Sans JP","Helvetica Neue",sans-serif;
  /* 設計図グリッド（ブループリント罫線・gold極薄・建設らしさ） */
  --blueprint:
    linear-gradient(rgba(201,160,90,.05) 1px,transparent 1px) 0 0/30px 30px,
    linear-gradient(90deg,rgba(201,160,90,.05) 1px,transparent 1px) 0 0/30px 30px,
    linear-gradient(rgba(201,160,90,.08) 1px,transparent 1px) 0 0/150px 150px,
    linear-gradient(90deg,rgba(201,160,90,.08) 1px,transparent 1px) 0 0/150px 150px;
  /* ドットグリッド（gold） */
  --dotgrid:radial-gradient(rgba(201,160,90,.10) 1.3px,transparent 1.4px) 0 0/24px 24px;
}

*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:var(--sans);
  color:var(--paper);
  /* ベタ黒→多層グラデで縦に奥行きを出す土台 */
  background:
    radial-gradient(120% 80% at 80% -5%, rgba(201,160,90,.07) 0%, transparent 55%),
    radial-gradient(100% 70% at 0% 105%, rgba(28,34,48,.9) 0%, transparent 60%),
    linear-gradient(180deg, #0a0d12 0%, #0c1018 50%, #090b10 100%);
  background-attachment:fixed;
  line-height:1.85;
  font-feature-settings:"palt";
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button{font-family:inherit;cursor:pointer}

/* 微粒子グレイン（全面オーバーレイ・写真とベタ面の均質感を消す） */
.grain{
  position:fixed;inset:0;z-index:9999;pointer-events:none;
  opacity:.045;mix-blend-mode:overlay;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.82' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* Disclaimer */
.m-disclaimer{
  background:#fffbe6;color:#7a5a00;
  border-bottom:1px solid #f5deb3;
  padding:10px 16px;font-size:11px;text-align:center;letter-spacing:.03em;
}
.m-disclaimer strong{color:#5a4400}

/* ========== Header ========== */
.m-header{
  position:fixed;top:30px;left:0;right:0;z-index:100;
  padding:14px 0;
  background:rgba(10,13,18,.7);
  backdrop-filter:blur(20px) saturate(140%);
  border-bottom:1px solid var(--line);
  transition:transform .3s ease, top .3s ease;
}
.m-header.is-scrolled{top:0;background:rgba(10,13,18,.92)}
.m-header .inner{
  max-width:1380px;margin:0 auto;padding:0 36px;
  display:flex;align-items:center;justify-content:space-between;gap:30px;
}
.m-brand{display:flex;align-items:baseline;gap:14px}
.m-brand .logo{
  font-family:var(--serif);
  font-size:22px;font-weight:500;letter-spacing:.08em;
  color:var(--paper);
}
.m-brand .logo em{font-style:italic;color:var(--gold)}
.m-brand .sub{
  font-family:var(--serif);
  font-size:10px;letter-spacing:.35em;color:var(--gold);
  text-transform:uppercase;
}
.m-nav{
  display:flex;gap:34px;font-size:11px;
  letter-spacing:.28em;text-transform:uppercase;
}
.m-nav a{
  color:var(--paper-dim);
  position:relative;padding:6px 0;
  transition:color .25s ease;
}
.m-nav a::after{
  content:"";position:absolute;left:0;bottom:0;
  width:0;height:1px;background:var(--gold);
  transition:width .35s cubic-bezier(.2,.8,.2,1);
}
.m-nav a:hover,.m-nav a.is-current{color:var(--gold)}
.m-nav a:hover::after,.m-nav a.is-current::after{width:100%}
.m-nav-cta{
  border:1px solid var(--gold);color:var(--gold);
  padding:9px 22px;font-size:10px;letter-spacing:.3em;
  border-radius:2px;transition:all .3s ease;
}
.m-nav-cta:hover{background:var(--gold);color:var(--ink)}
@media (max-width:880px){
  .m-nav a:not(.m-nav-cta){display:none}
}

/* ========== Quick contact rail (right side) ========== */
.m-rail{
  position:fixed;right:0;top:50%;transform:translateY(-50%);
  z-index:90;display:flex;flex-direction:column;gap:1px;
  background:var(--line);
  border-left:1px solid var(--gold);
}
.m-rail a{
  width:54px;aspect-ratio:1;display:flex;align-items:center;justify-content:center;
  background:rgba(10,13,18,.85);backdrop-filter:blur(8px);
  color:var(--paper-dim);transition:all .3s ease;
  border-bottom:1px solid var(--line);
}
.m-rail a:last-child{border-bottom:none}
.m-rail a:hover{background:var(--gold);color:var(--ink)}
.m-rail svg{width:20px;height:20px}
@media (max-width:720px){.m-rail{display:none}}

/* ========== Page section base ========== */
.m-section{padding:140px 0;position:relative;z-index:1}
.m-container{max-width:1380px;margin:0 auto;padding:0 36px}
.m-sh{margin-bottom:60px}
.m-sh.center{text-align:center}
.m-sh .no{
  font-family:var(--serif);font-size:11px;
  letter-spacing:.5em;color:var(--gold);text-transform:uppercase;
  display:inline-flex;align-items:center;gap:14px;
}
.m-sh .no::before{content:"";display:block;width:40px;height:1px;background:var(--gold)}
.m-sh.center .no::before{display:none}
.m-sh h2{
  font-family:var(--serif);font-size:clamp(36px,4.8vw,60px);
  font-weight:300;letter-spacing:.04em;margin:18px 0 18px;
  line-height:1.25;color:var(--paper);
}
.m-sh h2 em{color:var(--gold);font-style:italic}
.m-sh .lead{
  font-size:15px;color:var(--paper-dim);
  max-width:680px;line-height:2;
}
.m-sh.center .lead{margin-left:auto;margin-right:auto}

/* ========== Buttons ========== */
.m-btn{
  display:inline-flex;align-items:center;gap:14px;
  padding:18px 36px;font-size:11px;letter-spacing:.3em;
  text-transform:uppercase;font-weight:600;
  transition:all .35s cubic-bezier(.2,.8,.2,1);
  border-radius:2px;
}
.m-btn.gold{background:var(--gold);color:var(--ink)}
.m-btn.gold:hover{background:var(--gold-light);color:var(--ink)}
.m-btn.ghost{border:1px solid var(--paper-sub);color:var(--paper)}
.m-btn.ghost:hover{border-color:var(--gold);color:var(--gold);background:rgba(201,160,90,.05)}
.m-btn svg{width:14px;height:14px;transition:transform .35s ease}
.m-btn:hover svg{transform:translateX(4px)}

/* ========== Footer ========== */
.m-footer{
  background:#05070a;padding:80px 0 30px;
  color:var(--paper-sub);font-size:13px;
  border-top:1px solid var(--line);
}
.m-footer .inner{max-width:1380px;margin:0 auto;padding:0 36px}
.m-footer .grid{
  display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:50px;
  padding-bottom:50px;border-bottom:1px solid var(--line);
}
@media (max-width:880px){.m-footer .grid{grid-template-columns:1fr 1fr;gap:30px}}
.m-footer .brand-area .logo{
  font-family:var(--serif);font-size:24px;letter-spacing:.08em;
  color:var(--paper);margin-bottom:12px;
}
.m-footer .brand-area .logo em{font-style:italic;color:var(--gold)}
.m-footer .brand-area p{font-size:12.5px;color:var(--paper-sub);line-height:2;margin:0}
.m-footer h5{
  font-family:var(--serif);font-size:11px;
  letter-spacing:.35em;color:var(--gold);
  margin:0 0 16px;text-transform:uppercase;
}
.m-footer ul{list-style:none;padding:0;margin:0}
.m-footer li{margin-bottom:8px;font-size:12.5px}
.m-footer a:hover{color:var(--gold)}
.m-footer .copy{
  padding-top:24px;display:flex;justify-content:space-between;
  flex-wrap:wrap;gap:14px;font-size:11px;letter-spacing:.08em;
  color:var(--paper-sub);
}

/* ========== Icon link buttons (contact icons) ========== */
.m-icons{display:flex;flex-wrap:wrap;gap:14px;margin-top:30px}
.m-icon-btn{
  display:inline-flex;align-items:center;gap:10px;
  padding:14px 22px;font-size:11px;letter-spacing:.18em;
  text-transform:uppercase;font-weight:500;
  background:rgba(244,241,234,.06);
  border:1px solid var(--line);
  color:var(--paper);
  transition:all .3s ease;border-radius:2px;
}
.m-icon-btn:hover{background:var(--gold);color:var(--ink);border-color:var(--gold)}
.m-icon-btn svg{width:18px;height:18px}
.m-icon-btn.is-line{border-color:#06c755}
.m-icon-btn.is-line:hover{background:#06c755;border-color:#06c755;color:#fff}
.m-icon-btn.is-ig{border-color:#e1306c}
.m-icon-btn.is-ig:hover{background:linear-gradient(45deg,#f09433,#e6683c,#dc2743,#cc2366,#bc1888);border-color:transparent;color:#fff}
.m-icon-btn.is-tel{border-color:var(--gold)}
.m-icon-btn.is-tel:hover{background:var(--gold);color:var(--ink)}

/* ========== Parallax / scroll-driven reveal ========== */
.reveal{opacity:0;transform:translateY(40px);transition:opacity 1s ease, transform 1.1s cubic-bezier(.2,.8,.2,1)}
.reveal.is-shown{opacity:1;transform:translateY(0)}
.reveal.delay-1{transition-delay:.12s}
.reveal.delay-2{transition-delay:.24s}
.reveal.delay-3{transition-delay:.36s}

/* Parallax background utility */
.parallax-bg{
  position:absolute;inset:-10% 0;
  background-size:cover;background-position:center;
  z-index:0;will-change:transform;
}

/* ========== Sub-page hero (smaller) ========== */
.m-sub-hero{
  position:relative;min-height:50vh;display:flex;align-items:center;
  overflow:hidden;background:var(--ink-2);
  padding-top:100px;
}
.m-sub-hero .bg{
  position:absolute;inset:0;
  background-size:cover;background-position:center;
  opacity:.45;
}
.m-sub-hero::before{
  content:"";position:absolute;inset:0;
  background:linear-gradient(180deg,rgba(10,13,18,.5) 0%,rgba(10,13,18,.85) 100%);
}
.m-sub-hero .inner{position:relative;z-index:2;max-width:1380px;margin:0 auto;padding:60px 36px;width:100%}
.m-sub-hero .crumb{
  font-size:11px;letter-spacing:.22em;color:var(--gold);
  text-transform:uppercase;margin-bottom:24px;
}
.m-sub-hero .crumb a{color:var(--paper-dim)}
.m-sub-hero .crumb a:hover{color:var(--gold)}
.m-sub-hero h1{
  font-family:var(--serif);font-size:clamp(40px,5.6vw,72px);
  font-weight:300;letter-spacing:.04em;margin:0;line-height:1.2;
}
.m-sub-hero h1 em{color:var(--gold);font-style:italic}
.m-sub-hero .ja-sub{
  font-size:13px;color:var(--paper-dim);letter-spacing:.15em;
  margin-top:18px;line-height:2;
}