:root{
  --bg:#f5f6f8;--card:#fff;--text:#1a202c;--muted:#64748b;--line:#e2e8f0;
  --brand:#1d4ed8;--brand-dark:#1e3a8a;--up:#dc2626;--down:#16a34a;--flat:#64748b;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,"Helvetica Neue","Hiragino Sans","Hiragino Kaku Gothic ProN","Noto Sans JP","Yu Gothic",Meiryo,sans-serif;line-height:1.7;font-size:16px}
a{color:var(--brand);text-decoration:none}
a:hover{text-decoration:underline}
.wrap{max-width:960px;margin:0 auto;padding:0 16px}
h1{font-size:1.6rem;margin:.2em 0}
h2{font-size:1.2rem;margin:0 0 .6em;padding-bottom:.3em;border-bottom:2px solid var(--brand)}
h3{font-size:1rem;margin:0 0 .4em}
small{font-size:.75em;color:var(--muted);font-weight:normal}
.muted{color:var(--muted);font-size:.9rem}

.site-header{background:var(--brand-dark);color:#fff}
.site-header .wrap{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:8px;padding-top:10px;padding-bottom:10px}
.brand{color:#fff;font-weight:700;font-size:1.15rem}
.brand:hover{text-decoration:none}
.nav{display:flex;gap:4px;flex-wrap:wrap}
.nav a{color:#dbeafe;padding:4px 10px;border-radius:6px;font-size:.9rem}
.nav a.on,.nav a:hover{background:rgba(255,255,255,.15);color:#fff;text-decoration:none}

.crumb{font-size:.85rem;color:var(--muted);margin:14px 0 4px}
.hero{padding:18px 0 6px}
.lead{color:var(--muted);margin:0 0 12px}
.big{font-size:2rem;font-weight:700;margin:.2em 0}
.big small{font-size:.45em;margin-left:4px}

.tiles{display:grid;grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:10px;margin:12px 0}
.tile{display:flex;flex-direction:column;gap:2px;background:var(--card);border:1px solid var(--line);border-radius:10px;padding:12px 14px;color:var(--text)}
.tile:hover{text-decoration:none;border-color:var(--brand)}
.tile-label{font-size:.85rem;color:var(--muted)}
.tile-price{font-size:1.7rem;font-weight:700;line-height:1.2}
.tile-sub{font-size:.75rem;color:var(--muted)}

.badge{display:inline-block;font-size:.8rem;font-weight:600;padding:1px 8px;border-radius:999px;background:#f1f5f9;color:var(--flat);align-self:flex-start}
.badge.up{background:#fee2e2;color:var(--up)}
.badge.down{background:#dcfce7;color:var(--down)}

.card{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:18px 18px 14px;margin:16px 0}
.card p{margin:.4em 0}
.more{text-align:right;font-weight:600}

.facts{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:8px 16px;margin:10px 0 14px;padding:0}
.facts div{background:#f8fafc;border-radius:8px;padding:8px 10px}
.facts dt{font-size:.75rem;color:var(--muted)}
.facts dd{margin:0;font-weight:700;font-size:1.05rem}
.facts dd small{display:block;font-weight:normal}

.table-scroll{overflow-x:auto;-webkit-overflow-scrolling:touch}
table{border-collapse:collapse;width:100%;font-size:.92rem}
th,td{padding:7px 8px;border-bottom:1px solid var(--line);white-space:nowrap}
th{background:#f8fafc;font-weight:600;text-align:left;position:sticky;top:0}
.num{text-align:right;font-variant-numeric:tabular-nums}
.price{font-weight:700}
td.up{color:var(--up)}td.down{color:var(--down)}td.flat{color:var(--flat)}
tbody tr:hover{background:#f8fafc}

.chart-box{margin:10px 0}
.chart-head{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:6px}
.chart-wrap{position:relative;height:300px}
.range-btns button,.fuel-tabs button{border:1px solid var(--line);background:#fff;color:var(--text);padding:4px 10px;border-radius:6px;font-size:.85rem;cursor:pointer;margin-right:4px}
.range-btns button.on,.fuel-tabs button.on{background:var(--brand);color:#fff;border-color:var(--brand)}
.fuel-tabs{margin-bottom:8px}

.fuel-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:12px}
.fuel-item{border:1px solid var(--line);border-radius:10px;padding:12px}
.fuel-item .big{font-size:1.5rem}
.chip{display:inline-block;background:#eff6ff;border-radius:999px;padding:3px 12px;margin:3px 2px;font-size:.9rem}

.pref-index .region{margin:6px 0;line-height:2}
.region-name{display:inline-block;font-weight:600;color:var(--muted);font-size:.85rem;width:7em}
.pref-index a{display:inline-block;margin-right:10px}

details summary{cursor:pointer;color:var(--brand);font-weight:600;margin:6px 0}
.prose h2{margin-top:1.4em}
.prose ul{padding-left:1.4em}
.btn{display:inline-block;background:var(--brand);color:#fff;padding:8px 18px;border-radius:8px;font-weight:600}
.btn:hover{text-decoration:none;background:var(--brand-dark)}
.ad{margin:16px 0;min-height:90px}

.site-footer{background:#1e293b;color:#cbd5e1;font-size:.82rem;padding:20px 0;margin-top:30px}
.site-footer a{color:#e2e8f0}
.site-footer p{margin:.3em 0}

@media (max-width:600px){
  h1{font-size:1.35rem}
  .big{font-size:1.6rem}
  .chart-wrap{height:240px}
  th,td{padding:6px 6px;font-size:.85rem}
  .region-name{display:block;width:auto}
}