:root{
  /* 石垣 × 黄土 × 昔の日本 */
  --ocher:#b08b3f;
  --paper:#f6f1e4;
  --sand:#e8dcc2;

  --ink:#2f2f2f;
  --text:#221f1a;
  --muted:#4e463c;

  --stone:#7d8288;
  --stone2:#6b7076;

  --border:rgba(176,139,63,0.28);
  --shadow:0 14px 36px rgba(0,0,0,0.16);
}

*{margin:0;padding:0;box-sizing:border-box;}

body.ishigaki-theme{
  font-family:'Zen Kaku Gothic New','Hiragino Kaku Gothic ProN','Yu Gothic',sans-serif;
  color:var(--text);
  padding:20px;

  background:
    radial-gradient(1200px 700px at 15% 10%, rgba(176,139,63,0.22), transparent 55%),
    radial-gradient(900px 650px at 85% 12%, rgba(232,220,194,0.65), transparent 60%),
    linear-gradient(to bottom, var(--paper) 0%, #f2ead8 38%, var(--sand) 100%);
}

.container{
  max-width:920px;
  margin:0 auto;
  background:rgba(255,255,255,0.93);
  border-radius:18px;
  box-shadow:var(--shadow);
  overflow:hidden;
  border:1px solid var(--border);
}

.header{
  color:#fff;
  padding:58px 40px;
  text-align:center;
  background:linear-gradient(135deg, rgba(125,130,136,0.96), rgba(47,47,47,0.96));
  position:relative;
}

.header::after{
  content:"";
  position:absolute;
  left:0;right:0;bottom:0;
  height:10px;
  background:linear-gradient(90deg, rgba(176,139,63,0.88), rgba(232,220,194,0.88));
  opacity:0.9;
}

.app-title{
  font-family:'Shippori Mincho','Yu Mincho',serif;
  font-size:clamp(2.1rem, 4.6vw, 3.05rem);
  letter-spacing:0.10em;
  line-height:1.2;
}

.app-subtitle{
  margin-top:16px;
  font-size:1rem;
  letter-spacing:0.08em;
  opacity:0.95;
}

.content{padding:50px;}
.section{margin-bottom:50px;}

.section-title{
  font-family:'Shippori Mincho','Yu Mincho',serif;
  font-size:1.55rem;
  margin-bottom:22px;
  padding-left:18px;
  border-left:5px solid var(--ocher);
  color:var(--ink);
}

.card{
  background:linear-gradient(to bottom, rgba(255,255,255,0.97), rgba(246,241,228,0.96));
  padding:34px;
  border-radius:14px;
  border:1px solid rgba(125,130,136,0.22);
}

.card p{
  color:var(--muted);
  line-height:1.95;
  margin-top:14px;
}

.card p:first-child{margin-top:0;}

.subhead{
  font-size:1.05rem;
  color:var(--ink);
  letter-spacing:0.04em;
}

.features-list{
  list-style:none;
  margin-top:14px;
}

.features-list li{
  position:relative;
  padding-left:42px;
  margin:12px 0;
  color:var(--muted);
  line-height:1.75;
}

.features-list li::before{
  content:"🪨";
  position:absolute;
  left:0;
  top:0;
}

.keywords-card{
  background:linear-gradient(to bottom, rgba(255,255,255,0.97), rgba(242,234,216,0.96));
  border:1px solid rgba(176,139,63,0.22);
}

.keywords{
  word-break:break-word;
}

.kv{
  margin-top:14px;
  border-radius:12px;
  overflow:hidden;
  border:1px solid rgba(176,139,63,0.18);
  background:rgba(232,220,194,0.28);
}

.kv-row{
  display:flex;
  gap:14px;
  padding:12px 14px;
}

.kv-row + .kv-row{
  border-top:1px solid rgba(176,139,63,0.12);
}

.kv-key{
  min-width:110px;
  color:var(--ink);
  font-weight:700;
}

.kv-val{
  color:var(--muted);
  flex:1;
  word-break:break-word;
}

.note{
  margin-top:18px;
  color:var(--muted);
  line-height:1.9;
  background:rgba(232,220,194,0.35);
  border:1px solid rgba(176,139,63,0.22);
  padding:14px 16px;
  border-radius:12px;
}

.footer{
  padding:10px 0 0;
  text-align:center;
}

.footnote{
  color:rgba(78,70,60,0.85);
  font-size:0.85rem;
  padding-bottom:24px;
}

@media (max-width:768px){
  .content{padding:28px;}
  .header{padding:44px 22px;}
  .app-title{letter-spacing:0.08em;}
  .kv-row{flex-direction:column; gap:6px;}
  .kv-key{min-width:auto;}
}