/* 音澄舎 — 共通スタイル。外部読み込みなし・端末標準フォントのみ */
:root{
  --bg:#0c0e13; --bg2:#12151d; --panel:#171b25; --line:#2a3040;
  --ink:#e8e4da; --dim:#9a958a; --brass:#c8a464; --brass2:#e2c890;
  --serif:"Yu Mincho","Hiragino Mincho ProN","MS PMincho",serif;
  --sans:"Yu Gothic","Hiragino Kaku Gothic ProN",Meiryo,system-ui,sans-serif;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
body{background:var(--bg);color:var(--ink);font-family:var(--sans);line-height:1.9;
  letter-spacing:.02em;-webkit-font-smoothing:antialiased;overflow-x:hidden}
img,svg,canvas{max-width:100%;display:block}
a{color:inherit;text-decoration:none}

/* ---- ヘッダ ---- */
.gnav{position:fixed;inset:0 0 auto 0;z-index:50;display:flex;align-items:center;justify-content:space-between;
  padding:14px 22px;background:linear-gradient(180deg,rgba(12,14,19,.92),rgba(12,14,19,.72) 70%,transparent);
  backdrop-filter:blur(6px)}
.gnav .brand{display:flex;align-items:center;gap:10px;font-family:var(--serif);letter-spacing:.2em;font-size:1.02rem}
.gnav .brand svg{width:30px;height:30px}
.gnav ul{display:flex;gap:26px;list-style:none;font-size:.8rem;letter-spacing:.18em}
.gnav ul a{padding:6px 2px;border-bottom:1px solid transparent;transition:border-color .3s,color .3s}
.gnav ul a:hover,.gnav ul a[aria-current="page"]{color:var(--brass2);border-color:var(--brass)}
.menu-btn{display:none;background:none;border:1px solid var(--line);color:var(--ink);
  padding:8px 12px;font-size:.75rem;letter-spacing:.2em;cursor:pointer}
@media (max-width:760px){
  .gnav ul{position:fixed;inset:58px 0 auto 0;flex-direction:column;gap:0;background:#10131b;
    border-bottom:1px solid var(--line);display:none;padding:8px 0}
  .gnav ul.open{display:flex}
  .gnav ul a{display:block;padding:14px 26px;border-bottom:none}
  .menu-btn{display:block}
}

/* ---- ヒーロー ---- */
.hero{position:relative;min-height:100svh;display:grid;place-items:center;overflow:hidden}
.hero canvas{position:absolute;inset:0;width:100%;height:100%}
.hero .inner{position:relative;text-align:center;padding:110px 20px 80px;z-index:2}
.hero .en{font-size:.7rem;letter-spacing:.5em;color:var(--brass);text-transform:uppercase;margin-bottom:1.6em}
.hero h1{font-family:var(--serif);font-weight:500;font-size:clamp(1.7rem,5.4vw,3.4rem);
  letter-spacing:.14em;line-height:1.7}
.hero .lead{margin-top:1.8em;font-size:clamp(.82rem,1.7vw,.95rem);color:var(--dim);letter-spacing:.12em}
.hero .scrollcue{position:absolute;left:50%;bottom:26px;transform:translateX(-50%);
  font-size:.62rem;letter-spacing:.4em;color:var(--dim);writing-mode:vertical-rl;z-index:2}
.hero .scrollcue::after{content:"";display:block;width:1px;height:44px;margin:10px auto 0;
  background:linear-gradient(var(--brass),transparent)}
.motion-btn{position:absolute;right:18px;bottom:18px;z-index:3;background:rgba(23,27,37,.9);
  border:1px solid var(--brass);color:var(--brass2);padding:9px 16px;font-size:.72rem;
  letter-spacing:.14em;cursor:pointer;display:none}
.motion-btn.show{display:block}

/* ---- セクション共通 ---- */
main{position:relative;z-index:1}
.sec{max-width:1060px;margin:0 auto;padding:110px 24px}
.sec .en{font-size:.66rem;letter-spacing:.44em;color:var(--brass);text-transform:uppercase;display:block;margin-bottom:1.2em}
.sec h2{font-family:var(--serif);font-weight:500;font-size:clamp(1.3rem,3vw,1.9rem);letter-spacing:.12em;margin-bottom:1.6em}
.sec p{color:var(--dim);font-size:.92rem;max-width:640px}
.sec p+p{margin-top:1.2em}
.reveal{opacity:0;transform:translateY(26px);transition:opacity .9s ease,transform .9s ease}
.reveal.on{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){.reveal{opacity:1;transform:none;transition:none}}

/* ---- カード列 ---- */
.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;margin-top:44px}
@media (max-width:820px){.grid3{grid-template-columns:1fr}}
.tile{background:var(--panel);border:1px solid var(--line);padding:0 0 26px;transition:border-color .3s,transform .3s}
.tile:hover{border-color:var(--brass);transform:translateY(-4px)}
.tile .fig{aspect-ratio:4/3;display:grid;place-items:center;background:
  radial-gradient(70% 70% at 50% 42%,#1a1f2b,#0d1017 80%);border-bottom:1px solid var(--line)}
.tile .fig svg{width:58%}
.tile h3{font-family:var(--serif);font-weight:500;font-size:1.02rem;letter-spacing:.1em;margin:20px 22px 8px}
.tile .cap{font-size:.72rem;color:var(--brass);letter-spacing:.18em;margin:0 22px 10px}
.tile p{font-size:.8rem;color:var(--dim);margin:0 22px}

/* ---- 帯・数字 ---- */
.band{background:var(--bg2);border-block:1px solid var(--line)}
.nums{display:grid;grid-template-columns:repeat(3,1fr);gap:2px;max-width:1060px;margin:0 auto}
@media (max-width:720px){.nums{grid-template-columns:1fr}}
.nums div{padding:44px 20px;text-align:center}
.nums b{font-family:var(--serif);font-size:2.1rem;font-weight:500;color:var(--brass2);display:block;letter-spacing:.06em}
.nums span{font-size:.72rem;color:var(--dim);letter-spacing:.22em;display:block;margin-top:.8em}

/* ---- 工程(縦流れ) ---- */
.steps{counter-reset:s;margin-top:44px;display:grid;gap:2px}
.step{display:grid;grid-template-columns:96px 1fr;gap:26px;background:var(--panel);
  border:1px solid var(--line);padding:30px 28px;align-items:start}
@media (max-width:640px){.step{grid-template-columns:1fr;gap:10px}}
.step::before{counter-increment:s;content:"0" counter(s);font-family:var(--serif);
  font-size:1.9rem;color:var(--brass);letter-spacing:.08em;line-height:1}
.step h3{font-family:var(--serif);font-weight:500;font-size:1.05rem;letter-spacing:.1em;margin-bottom:.5em}
.step p{font-size:.85rem;color:var(--dim);max-width:none}

/* ---- 表 ---- */
.spec{width:100%;border-collapse:collapse;margin-top:34px;font-size:.85rem}
.spec th,.spec td{border:1px solid var(--line);padding:13px 16px;text-align:left;vertical-align:top}
.spec th{background:var(--bg2);font-weight:500;color:var(--brass2);letter-spacing:.1em;white-space:nowrap}
.tablewrap{overflow-x:auto}

/* ---- フォーム ---- */
.form{display:grid;gap:18px;max-width:560px;margin-top:40px}
.form label{font-size:.78rem;letter-spacing:.18em;color:var(--brass2)}
.form input,.form textarea,.form select{width:100%;background:var(--bg2);border:1px solid var(--line);
  color:var(--ink);padding:13px 14px;font:inherit;font-size:.9rem}
.form input:focus,.form textarea:focus,.form select:focus{outline:1px solid var(--brass)}
.btn{display:inline-block;background:none;border:1px solid var(--brass);color:var(--brass2);
  padding:14px 42px;font:inherit;font-size:.82rem;letter-spacing:.3em;cursor:pointer;transition:background .3s,color .3s}
.btn:hover{background:var(--brass);color:#14110a}
.note{font-size:.72rem;color:var(--dim);margin-top:.6em}

/* ---- ページ見出し(下層) ---- */
.pagehead{padding:170px 24px 60px;text-align:center;background:
  radial-gradient(80% 120% at 50% -20%,#1a2030,var(--bg) 70%)}
.pagehead .en{font-size:.66rem;letter-spacing:.5em;color:var(--brass);text-transform:uppercase}
.pagehead h1{font-family:var(--serif);font-weight:500;font-size:clamp(1.5rem,4vw,2.3rem);
  letter-spacing:.16em;margin-top:.8em}

/* ---- フッタ ---- */
footer{border-top:1px solid var(--line);padding:60px 24px 40px;background:var(--bg2)}
footer .cols{max-width:1060px;margin:0 auto;display:flex;flex-wrap:wrap;gap:34px;justify-content:space-between}
footer .brand{font-family:var(--serif);letter-spacing:.24em;font-size:1rem}
footer nav{display:flex;gap:22px;font-size:.76rem;letter-spacing:.16em;flex-wrap:wrap}
footer nav a:hover{color:var(--brass2)}
footer .legal{max-width:1060px;margin:36px auto 0;font-size:.68rem;color:var(--dim);
  border-top:1px solid var(--line);padding-top:22px;letter-spacing:.06em}