cat > /usr/local/www/data/css/site.css << 'EOF'
:root{
  --max:1100px;
  --fg:#fff;
  --muted:rgba(255,255,255,.78);
  --line:rgba(255,255,255,.14);
  --card:rgba(0,0,0,.35);
  --shadow:0 14px 40px rgba(0,0,0,.35);
  --radius:18px;
}

*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  font-family: system-ui,-apple-system,"Segoe UI",sans-serif;
color:#f8fafc; 
  line-height:1.7;
  background:#000;
}

a{color:inherit;text-decoration:none}
a:hover{text-decoration:underline}

.container{max-width:var(--max);margin:0 auto;padding:0 18px}

.bg{
  min-height:100vh;
  background-image: url("/img/background.png");
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  position:relative;
}

/* 読みやすさ確保用の暗幕（画像は見せつつ文字を浮かせる） */
.bg::before{
  content:"";
  position:absolute; inset:0;
  background:
    radial-gradient(1200px 600px at 20% 20%, rgba(0,0,0,.25), rgba(0,0,0,.70)),
    linear-gradient(to bottom, rgba(0,0,0,.25), rgba(0,0,0,.75));
}

.layer{position:relative; z-index:1;}

.header{
  position:sticky; top:0; z-index:10;
  backdrop-filter: blur(10px);
  background:rgba(0,0,0,.35);
  border-bottom:1px solid var(--line);
}
.header-inner{
  min-height:64px;
  display:flex; align-items:center; justify-content:space-between;
  gap:14px;
}
.brand{font-weight:800; letter-spacing:.02em}
.nav{display:flex; gap:14px; align-items:center}
.nav a{padding:8px 10px;border-radius:12px}
.nav a:hover{background:rgba(255,255,255,.08);text-decoration:none}

.btn{
  display:inline-block;
  padding:10px 14px;
  border-radius:14px;
  border:1px solid rgba(255,255,255,.24);
  background:rgba(0,0,0,.35);
  text-decoration:none;
}
.btn:hover{background:rgba(0,0,0,.5);text-decoration:none}

.hero{padding:62px 0 34px}
.hero-inner{display:grid; grid-template-columns: 1.3fr .9fr; gap:18px; align-items:start}
h1{
  font-size:44px;
  line-height:1.12;
  margin:0 0 12px;
  color:#ffffff;
  text-shadow:
    0 2px 6px rgba(0,0,0,0.85),
    0 0 20px rgba(0,0,0,0.6);
}

.lead{
  font-size:18px;
  line-height:1.7;
  margin:0 0 18px;
  color:#f5f7fa; /* 完全白より少し柔らかい白 */
  text-shadow:
    0 1px 4px rgba(0,0,0,0.9);
}


.card{
  background:var(--card);
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:16px;
  box-shadow: var(--shadow);
}

.grid{display:grid; grid-template-columns:repeat(3,1fr); gap:14px}
.section{padding:28px 0}
.section h2{margin:0 0 12px; font-size:24px}
.muted{color:var(--muted)}
.small{font-size:14px}
.footer{padding:26px 0; border-top:1px solid var(--line); background:rgba(0,0,0,.35)}

@media (max-width: 900px){
  .hero-inner{grid-template-columns:1fr}
  .grid{grid-template-columns:1fr}
  h1{font-size:34px}
}